WO2018110395A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2018110395A1
WO2018110395A1 PCT/JP2017/043900 JP2017043900W WO2018110395A1 WO 2018110395 A1 WO2018110395 A1 WO 2018110395A1 JP 2017043900 W JP2017043900 W JP 2017043900W WO 2018110395 A1 WO2018110395 A1 WO 2018110395A1
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WO
WIPO (PCT)
Prior art keywords
metal case
pair
type secondary
secondary cells
assembled battery
Prior art date
Application number
PCT/JP2017/043900
Other languages
French (fr)
Japanese (ja)
Inventor
幸田　秀夫
中村　仁
Original Assignee
ヤマハ発動機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ発動機株式会社 filed Critical ヤマハ発動機株式会社
Priority to KR1020197016842A priority Critical patent/KR20190077537A/en
Priority to CN201780077528.0A priority patent/CN110073516A/en
Priority to TW106144113A priority patent/TWI672848B/en
Publication of WO2018110395A1 publication Critical patent/WO2018110395A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6562—Gases with free flow by convection only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/271—Lids or covers for the racks or secondary casings
    • H01M50/273—Lids or covers for the racks or secondary casings characterised by the material
    • H01M50/278—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to an assembled battery including a plurality of secondary cells.
  • An electric vehicle using a motor as a drive source includes an assembled battery for supplying electric power to the motor.
  • Such an assembled battery is required to be capable of being charged and discharged with a large current.
  • a battery module described in Japanese Patent Application Laid-Open No. 2008-243526 includes a plurality of submodules and an outer case that houses the plurality of submodules.
  • Each submodule includes a plurality of secondary cells (single cells) and a submodule holder that holds the plurality of secondary cells.
  • Each secondary cell has a positive electrode sheet and a negative electrode sheet that are wound together with a separator, and a metal case that houses them.
  • the assembled battery (battery module) described in the above publication includes a honeycomb structure on one surface of an outer case that houses a plurality of submodules.
  • the secondary cells can be cooled by sending cooling air from the cavities of the honeycomb structure into the outer case.
  • An object of the present invention is to suppress an increase in temperature caused by charging / discharging with a large current in an assembled battery including a plurality of secondary cells.
  • the inventors of the present application studied the heat dissipation state of the secondary cell when the assembled battery was charged and discharged with a large current.
  • the inventors of the present application paid attention to the arrangement of the positive electrode sheet and the negative electrode sheet that the secondary cell has.
  • the positive electrode sheet and the negative electrode sheet are accommodated in a metal case in a rolled state. Therefore, the outer peripheral part of the wound positive electrode sheet and negative electrode sheet is likely to radiate heat from the metal case.
  • the central part of the wound positive electrode sheet and negative electrode sheet was likely to accumulate heat.
  • the inventor of this application has come up with the idea that the positive electrode sheet and the negative electrode sheet are accommodated in the metal case in a flat state, rather than being accommodated in the metal case in a state where the positive electrode sheet and the negative electrode sheet are wound.
  • the entire surface of the positive electrode sheet and the negative electrode sheet laminated in a flat state is close to a metal case. Thereby, even if the assembled battery is charged and discharged with a large current, the secondary cell easily dissipates heat.
  • the electrolyte is an electrolytic solution
  • the positive electrode sheet and the negative electrode sheet are used in a state of being immersed in the electrolytic solution.
  • the metal case is required to have a sealing property for enclosing the electrolytic solution.
  • the length of the portion to be welded or bonded to seal is longer than that of a metal case that accommodates a rolled positive electrode sheet and negative electrode sheet. Lengthens. Therefore, it is difficult to ensure sealing performance. Therefore, it is difficult for the metal case that accommodates the flat positive electrode sheet and the negative electrode sheet to ensure hermeticity as compared to the metal case that accommodates the positive electrode sheet and the negative electrode sheet that are wound.
  • the inventors of the present application have intensively studied a structure for ensuring the sealing performance of the secondary cell.
  • the case of the secondary cell has a double structure, and a flexible case that is easier to secure the sealing than the metal case is provided inside the metal case. Accordingly, it has been found that the heat dissipation of the secondary cell can be secured by the outer metal case while the sealing property of the secondary cell is secured by the flexible inner case.
  • the present invention has been completed based on the above findings.
  • An assembled battery according to the present invention includes a pair of electrode sheets composed of one positive electrode sheet and one negative electrode sheet, a metal case made of metal that accommodates the pair of electrode sheets, and an insulating material An insulating cap portion formed in the opening of the metal case and electrically connected to the pair of electrode sheets, each part of which is installed in the insulating cap portion and external to the metal case And a pair of cell terminals having a pair of connection surfaces exposed to the battery.
  • Each of the plurality of metal case-type secondary cells includes the pair of electrode sheets disposed inside the metal case, formed of a flexible synthetic resin film, and laminated in a flat state.
  • An inner case is accommodated and sealed with an electrolyte so as to be in contact with the pair of flat electrode sheets, and is in surface contact with the first inner surface of the metal case in the stacking direction of the pair of flat electrode sheets.
  • Each of the plurality of metal case-type secondary cells has a flat board shape in which a length of the pair of flat electrode sheets in the stacking direction is smaller than a minimum length in a direction perpendicular to the stacking direction.
  • the plurality of metal case type secondary cells are stacked in the stacking direction of the pair of flat electrode sheets.
  • the assembled battery of the present invention includes a plurality of metal case type secondary cells.
  • Each of the plurality of metal case-type secondary cells includes a pair of electrode sheets, a metal metal case, an inner case, an insulating cap portion, and a pair of cell terminals.
  • the pair of electrode sheets is composed of one positive electrode sheet and one negative electrode sheet.
  • the metal case accommodates a pair of electrode sheets.
  • the insulating cap part is formed of an insulating material and is installed in the opening of the metal case.
  • the pair of cell terminals are electrically connected to the pair of electrode sheets.
  • a part of each of the pair of cell terminals is installed in the insulating cap part. Thereby, the pair of cell terminals are electrically insulated from the metal case.
  • the pair of cell terminals has a pair of connection surfaces exposed to the outside of the metal case.
  • the plurality of metal case type secondary cells are connected in series or in parallel using a pair of connection surfaces of each of the plurality of metal case type secondary cells.
  • the pair of electrode sheets are laminated in a flat state. Therefore, each of the plurality of metal case-type secondary cells has a flat length in the stacking direction of the pair of flat electrode sheets that is smaller than the minimum length in the direction perpendicular to the stacking direction of the pair of flat electrode sheets. Board shape.
  • the plurality of metal case type secondary cells are stacked in the stacking direction of a pair of flat electrode sheets. Therefore, although the shape of the metal case type secondary cell is a flat board shape, the shape of the assembled battery can be a box shape like the assembled battery including the positive electrode sheet and the negative electrode sheet in a wound state. .
  • the positive electrode sheet and the negative electrode sheet are laminated in a flat state.
  • the pair of flat electrode sheets are arranged substantially parallel to the inner surface of the metal case. That is, the flat positive electrode sheet has a substantially constant shortest distance to the inner surface of the metal case.
  • a flat negative electrode sheet has a substantially constant shortest distance to the inner surface of the metal case. Therefore, the heat dissipation of the pair of electrode sheets can be made uniform as compared with the case where the pair of electrode sheets are arranged in a wound state. Therefore, when the assembled battery is charged / discharged with a large current, the metal case-type secondary cell easily radiates heat.
  • the metal case has a shape that accommodates a pair of electrode sheets in a flat state, it is difficult to ensure the sealing property necessary for enclosing the liquid electrolyte with the metal case. Therefore, the pair of electrode sheets is accommodated in an inner sheet disposed inside the metal sheet. In the inner case, the electrolyte is sealed so as to come into contact with the pair of electrode sheets.
  • the inner case is formed of a flexible synthetic resin film. For this reason, the inner case easily secures a sealing property necessary for enclosing the liquid electrolyte, despite accommodating a pair of electrode sheets laminated in a flat state.
  • the heat dissipation of the metal case type secondary cell can be ensured by the metal case while the inner case ensures the sealing property of the metal case type secondary cell.
  • the inner case is in surface contact with the first inner surface of the metal case in the stacking direction of the pair of flat electrode sheets. Therefore, the heat generated when the metal case type secondary cell is charged and discharged can be released from the first inner surface of the metal case. As a result, in each of the plurality of metal case-type secondary cells, temperature rise due to charging / discharging of the assembled battery with a large current can be suppressed.
  • the assembled battery of the present invention preferably has the following configuration.
  • the inner case is in contact with the first inner surface of the metal case in a state where the inner case is in surface contact with the first inner surface of the metal case. It is away from the second inner surface facing each other.
  • the inner case can be allowed to expand due to charging / discharging of the metal case type secondary cell.
  • the assembled battery of the present invention preferably has the following configuration.
  • the plurality of metal case-type secondary cells so that the metal case of one of the two metal case-type secondary cells adjacent in the stacking direction is separated from the metal case of the other in the stacking direction. are stacked.
  • the assembled battery of the present invention preferably has the following configuration.
  • the plurality of metal case molds so that the insulating cap part of one of the two metal case type secondary cells adjacent in the stacking direction is in contact with the insulating cap part of the other in the stacking direction. Secondary cells are stacked.
  • the assembled battery of the present invention preferably has the following configuration in addition to the above-described configuration (4).
  • the insulating cap portion of each of the plurality of metal case type secondary cells has at least one convex portion on one surface in the stacking direction and at least one concave portion on the other surface in the stacking direction.
  • the at least one convex portion of one of the two insulating cap portions adjacent to each other in the stacking direction is fitted into the at least one concave portion of the other.
  • This configuration can prevent a plurality of metal case type secondary cells from being displaced in a direction perpendicular to the stacking direction of the pair of electrode sheets. Therefore, a plurality of metal case type secondary cells can be easily stacked in the stacking direction of the pair of electrode sheets. Moreover, the structure which ensures a clearance gap between metal cases can be implement
  • the assembled battery of the present invention preferably has the following configuration.
  • the pair of cell terminals included in each of the plurality of metal case type secondary cells is disposed on both sides of the pair of flat electrode sheets in a direction perpendicular to the stacking direction.
  • the structure of connecting parts for connecting a plurality of metal case type secondary cells in series or in parallel is simplified. It can. Since the structure of the connecting part is simple, the connecting part can have a structure that does not hinder heat dissipation of the plurality of metal case type secondary cells as much as possible. As a result, temperature rise due to charging / discharging the assembled battery with a large current can be further suppressed.
  • the assembled battery of the present invention preferably has the following configuration.
  • the pair of connection surfaces of each of the plurality of metal case-type secondary cells is oriented in a direction perpendicular to the stacking direction.
  • connection components face the stacking direction of a pair of electrode sheets, that is, the stacking direction of a plurality of metal case type secondary cells, the plurality of metal case type secondary cells are connected in series. Therefore, it is possible to simplify the structure of the connecting parts.
  • the structure of the connection component for connecting a plurality of metal case type secondary cells in parallel is complicated. Therefore, even if a plurality of metal case-type secondary cells are connected in series or in parallel because the pair of connection surfaces are oriented in the direction perpendicular to the stacking direction of the pair of electrode sheets.
  • the structure of the connection component for connecting the metal case type secondary cell can be simplified.
  • the connecting part Since the structure of the connecting part is simple, the connecting part can have a structure that does not hinder heat dissipation of the plurality of metal case type secondary cells as much as possible. As a result, temperature rise due to charging / discharging of the assembled battery with a large current can be further suppressed.
  • the assembled battery of the present invention preferably has the following configuration.
  • a pair of cell terminals has a pair of lead tabs, a pair of lead tabs, and a pair of external terminals that are separate members. Therefore, the degree of freedom in designing a pair of cell terminals can be improved. Therefore, the metal case type secondary cell can have a structure in which heat generated by charging and discharging is more easily released. As a result, temperature rise due to charging / discharging the assembled battery with a large current can be further suppressed.
  • a secondary cell is a battery that includes only one positive electrode and one negative electrode and can be repeatedly charged and discharged.
  • the fact that the electrode sheet is flat is not limited to the case where the electrode sheet is parallel to a single plane. If the electrode sheet is disposed along a single plane, a part or the whole of the electrode sheet may be gently bent. When the electrode sheet is wound more than once, the electrode sheet is not flat. When the entire shape of the wound electrode sheet is a rectangular parallelepiped, the electrode sheet is not flat even if the thickness of the rectangular parallelepiped is thin.
  • the flat board shape is the shape of the secondary cell when the secondary cell has a pair of flat electrode sheets.
  • a secondary cell having a pair of wound electrode sheets is a box type (also called a square type) or a cylindrical type.
  • storing is not limited to storing in a closed space. It includes the case where it is accommodated in at least a unidirectional space. That is, when a part with a case is accommodated, the space for accommodating the part, which is formed only by the case, may or may not be a closed space.
  • the metal case in the present invention accommodates a pair of electrode sheets, but the metal case has an opening.
  • a contacts with B in the X direction means that the portions where A and B contact each other are in contact with each other in the X direction.
  • the end portion of a part means a portion obtained by combining the end of the part and its vicinity.
  • a and B being arranged in the X direction indicates the following state. Even when A and B are viewed from any direction orthogonal to the X direction, an arbitrary straight line or curve indicating the X direction passes through both A and B. Also, the fact that the whole A is aligned in the B and X directions means that the whole A faces the B and X directions. That is, the whole A overlaps with B when viewed in the X direction. You may paraphrase the whole in part.
  • a and B being arranged in the X direction when viewed from the Y direction indicates the following state. When A and B are viewed from the Y direction, an arbitrary straight line or curve indicating the X direction passes through both A and B.
  • a and B When A and B are viewed from the W direction different from the Y direction, A and B may not be aligned in the X direction.
  • the entire A lined up in the B and X directions means that the entire A appears to face the B and X directions when viewed from the Y direction. You may paraphrase the whole in part.
  • a and B may be in contact with each other.
  • a and B may be separated from each other.
  • C may exist between A and B.
  • a being arranged between B and C refers to the following states unless otherwise specified.
  • An arbitrary straight line passes through B, A, and C in this order. That is, B, A, and C are arranged in this order in an arbitrary straight line direction.
  • the terms mounted, connected, coupled, and supported are used in a broad sense. Specifically, it includes not only direct attachment, connection, coupling and support, but also indirect attachment, connection, coupling and support. Further, connected and coupled are not limited to physical or mechanical connections / couplings. They also include direct or indirect electrical connections / couplings.
  • the term “preferred” is non-exclusive. “Preferred” means “preferably but not limited to”. In the present specification, the configuration described as “preferable” has at least the above-described effect obtained by the configuration of claim 1. Further, in this specification, the term “may” is non-exclusive. “May” means “may be, but is not limited to”. In the present specification, a configuration described as “may” at least exhibits the above-described effect obtained by the configuration of claim 1.
  • the assembled battery including a plurality of metal case type secondary cells of the present invention can suppress temperature rise due to charging / discharging with a large current.
  • FIG. 3 is a side view of a plurality of metal case type secondary cells provided in the assembled battery shown in FIG. 2 when viewed in the Y-direction.
  • FIG. 3 is a perspective view of one of a plurality of metal case type secondary cells provided in the assembled battery shown in FIG. 2.
  • FIG. 7 is an exploded perspective view of the metal case type secondary cell shown in FIG.
  • FIG. 7 is a sectional view taken along line IX-IX in FIG. 6. It is a perspective view of the metal case component which the metal case type secondary cell shown in FIG. 6 has. It is a perspective view of other metal case components which have a metal case type secondary cell shown in FIG. It is a perspective view of the insulation cap main body which the metal case type secondary cell shown in FIG. 6 has. It is the top view which looked at the insulation cap main body shown in FIG. 12 in the X + direction. It is a perspective view of the insulating cover which the metal case type secondary cell shown in FIG. 6 has. It is a perspective view of the external terminal which the metal case type secondary cell shown in FIG. 6 has. It is sectional drawing of the contact part of the insulation cap parts of two adjacent metal case type secondary cells. It is a side view of the some metal case type secondary cell with which the assembled battery of the example of a change of embodiment of this invention is provided.
  • the assembled battery 10 includes a plurality of metal case type secondary cells 14.
  • Each of the plurality of metal case type secondary cells 14 includes a pair of electrode sheets 146 and 147, a metal case 141 made of metal, an inner case 142, an insulating cap portion 143, and a pair of cell terminals 144 and 145. And have.
  • the pair of electrode sheets 146 and 147 includes one negative electrode sheet 146 and one positive electrode sheet 147.
  • the metal case 141 accommodates a pair of electrode sheets 146 and 147.
  • the insulating cap part 143 is formed of an insulating material and is installed in the opening of the metal case 141.
  • the pair of cell terminals 144 and 145 are electrically connected to the pair of electrode sheets 146 and 147.
  • a part of each of the pair of cell terminals 144 and 145 is installed in the insulating cap part 143. Thereby, the pair of cell terminals 144 and 145 are electrically insulated from the metal case 141.
  • the pair of cell terminals 144 and 145 have a pair of connection surfaces 144a and 145a exposed to the outside of the metal case 141.
  • the plurality of metal case type secondary cells 14 are connected in series or in parallel using a pair of connection surfaces 144a and 145a which each of the plurality of metal case type secondary cells 14 has.
  • FIG. 1 shows a case where a plurality of metal case type secondary cells 14 are connected in series.
  • the inner case 142 is disposed inside the metal case 141.
  • the inner case 142 is formed of a flexible synthetic resin film.
  • the inner case 142 accommodates a pair of electrode sheets 146 and 147 that are laminated in a flat state.
  • An electrolyte is sealed in the inner case 142 so as to contact the pair of flat electrode sheets 146 and 147.
  • the inner case 142 is in surface contact with the first inner surface 141a of the metal case 141 in the stacking direction of the pair of flat electrode sheets 146, 147.
  • each of the plurality of metal case-type secondary cells 14 has a length in the stacking direction of the pair of flat electrode sheets 146 and 147 that is perpendicular to the stacking direction of the pair of flat electrode sheets 146 and 147. It is a flat board shape smaller than the minimum length in.
  • the plurality of metal case type secondary cells 14 are stacked in the stacking direction of a pair of flat electrode sheets 146 and 147. Therefore, although the shape of the metal case type secondary cell 14 is a flat board shape, the shape of the assembled battery 10 is a box shape as in the assembled battery including the positive electrode sheet and the negative electrode sheet in a wound state. Can do.
  • the negative electrode sheet 146 and the positive electrode sheet 147 are laminated in a flat state. Therefore, the pair of flat electrode sheets 146 and 147 are disposed substantially parallel to the inner surface of the metal case 141. That is, the flat negative electrode sheet 146 has a substantially constant shortest distance to the inner surface of the metal case 141.
  • the flat positive electrode sheet 147 has a substantially constant shortest distance to the inner surface of the metal case 141. Therefore, the heat dissipation of the pair of electrode sheets 146 and 147 can be made uniform as compared with the case where the pair of electrode sheets 146 and 147 are arranged in a wound state. Therefore, when the assembled battery 10 is charged / discharged with a large current, the metal case-type secondary cell 14 easily radiates heat.
  • the metal case 141 has a shape that accommodates the pair of electrode sheets 146 and 147 in a flat state, it is difficult to ensure the sealing performance necessary for enclosing the liquid electrolyte by the metal case 141. . Therefore, the pair of electrode sheets 146 and 147 are accommodated in the inner sheet disposed inside the metal sheet.
  • the inner case 142 is sealed so that the electrolyte contacts the pair of electrode sheets 146 and 147.
  • the inner case 142 is formed of a flexible synthetic resin film. Therefore, the inner case 142 is easy to ensure the sealing performance necessary to enclose the liquid electrolyte in spite of accommodating the pair of electrode sheets 146 and 147 laminated in a flat state.
  • the heat dissipation of the metal case type secondary cell 14 can be secured by the metal case 141 while the inner case 142 ensures the sealing property of the metal case type secondary cell 14. Further, the inner case 142 is in surface contact with the first inner surface 141a of the metal case 141 in the stacking direction of the pair of flat electrode sheets 146 and 147. Therefore, the heat generated when the metal case type secondary cell 14 is charged / discharged can be released from the first inner surface 141a of the metal case 141. As a result, in each of the plurality of metal case type secondary cells 14, it is possible to suppress an increase in temperature caused by charging / discharging the assembled battery 10 with a large current.
  • a direction including both the Y + direction and the Y ⁇ direction is referred to as a Y direction.
  • a direction including both the Z + direction and the Z ⁇ direction is referred to as a Z direction.
  • the X direction is a direction perpendicular to the Y direction and the Z direction
  • the Y direction is a direction perpendicular to the Z direction.
  • a symbol with a small black circle displayed in a circle shown in FIG. 3 or the like indicates a direction from the back to the front of the page.
  • the assembly battery 10 includes a housing 11.
  • the housing 11 has a substantially rectangular parallelepiped box shape.
  • the housing 11 is made of an insulating material.
  • the insulating material is, for example, a synthetic resin.
  • the housing 11 has a pair of assembled battery terminals 12 and 13 on its outer surface.
  • the assembled battery 10 is connected to a power supply device (not shown) via a pair of assembled battery terminals 12 and 13.
  • the power supply device supplies power to the assembled battery 10.
  • the assembled battery 10 is connected to a power consuming device (not shown) that consumes power via a pair of assembled battery terminals 12 and 13.
  • the assembled battery 10 supplies power to the power consuming device.
  • the power consumption device is not specifically limited.
  • the X + direction is the upward direction on the page.
  • the direction when the assembled battery 10 is used is not limited to the direction in which the upward direction in the drawing of FIG.
  • the assembled battery 10 may be used so that the upper direction in FIG. 2 is the lower direction.
  • the assembled battery 10 may be used so that the upper direction in FIG. 2 is the horizontal direction.
  • the assembled battery 10 may be used so that the upward direction in FIG. 2 is the other direction.
  • the housing 11 accommodates a plurality of metal case type secondary cells 14 shown in FIGS. 3, 4 and 5.
  • the plurality of metal case type secondary cells 14 are accommodated in the housing 11 in a state of being stacked in the X direction.
  • the metal case type secondary cell 14 is, for example, a lithium ion battery (lithium ion cell).
  • the type of the metal case type secondary cell 14 is not limited to this.
  • the housing 11 houses a battery management device (BMS: Battery Management System) that manages the plurality of metal case type secondary cells 14.
  • BMS Battery Management System
  • the battery management device is disposed on the X + direction side of the plurality of metal case type secondary cells 14.
  • the housing 11 that accommodates the plurality of metal case-type secondary cells 14 has a plurality of vent holes 11a on both sides in the Z direction. Therefore, the heat generated by charging / discharging of the metal case type secondary cell 14 is easily released to the outside of the housing 11.
  • the plurality of metal case type secondary cells 14 have the same shape and size.
  • the plurality of metal case type secondary cells 14 have the same internal structure. However, the directions of the two metal case-type secondary cells 14 adjacent in the X direction differ by 180 ° around the axis in the X direction.
  • the metal case type secondary cell 14 has a rectangular flat plate shape (flat board shape) as a whole.
  • the length of the metal case type secondary cell 14 in the Y direction is larger than the length of the metal case type secondary cell 14 in the Z direction.
  • the length of the metal case type secondary cell 14 in the X direction is smaller than the length of the metal case type secondary cell 14 in the Z direction.
  • the thickness direction of the metal case type secondary cell 14 is the X direction.
  • the metal case type secondary cell 14 includes a metal case 141, an inner case 142, an insulating cap portion 143, and a pair of electrode sheets 146, 147 (FIGS. 8 and 9). 9) and a pair of cell terminals 144 and 145.
  • the insulating cap part 143 has a pair of insulating caps 143A and 143B.
  • the cell terminal 144 includes a lead tab 1441 and an external terminal 1442.
  • the cell terminal 145 has a lead tab 1451 and an external terminal 1452.
  • the display of the metal case component 1412, the half of the insulating cap 143, and the half of the pair of external terminals 1442 and 1452 is omitted.
  • the metal case 141 constitutes most of the outer shape of the metal case type secondary cell 14.
  • the metal case 141 has openings at both ends in the Y direction.
  • the metal case 141 has a rectangular cylindrical shape.
  • the length of the metal case 141 in the Y direction is larger than the length of the metal case 141 in the Z direction.
  • the length (thickness) of the metal case 141 in the X direction is smaller than the length of the metal case 141 in the Z direction.
  • the metal case 141 has plane symmetry with respect to a plane perpendicular to the Y direction.
  • the end of the metal case 141 in the Y + direction is plane-symmetric with the end of the metal case 141 in the Y ⁇ direction with respect to a plane perpendicular to the Y direction. Further, the metal case 141 has plane symmetry with respect to a plane perpendicular to the Z direction.
  • the metal case 141 is made of a metal material.
  • the metal material is not particularly limited.
  • the metal material is, for example, an aluminum alloy.
  • the metal case 141 has a metal case component 1411 and a metal case component 1412.
  • the metal case component 1412 is attached to the metal case component 1411 so as to be laminated with the metal case component 1411 in the X direction.
  • the metal case component 1411 includes a main plate portion 14111 and a pair of side plate portions 14112 and 14112.
  • the metal case part 1411 is composed of one part. That is, the main plate portion 14111 and the pair of side plate portions 14112 and 14112 are integrally formed.
  • the main plate portion 14111 has a rectangular flat plate shape.
  • the main plate portion 14111 is disposed along a direction perpendicular to the X direction.
  • the thickness direction of the main plate portion 14111 is the X direction. That is, the length (thickness) of the main plate portion 14111 in the X direction is smaller than the length of the main plate portion 14111 in the Y direction and the length in the Z direction.
  • the length (thickness) in the X direction of the main plate portion 14111 is smaller than the length in the Y direction and the length in the Z direction of the main plate portion 14111.
  • the main plate portion 14111 has a surface 14111a facing the X + direction.
  • the surface 14111a is perpendicular to the X direction.
  • the surface 14111a constitutes a part of the inner surface of the metal case 141.
  • the surface 14111a is referred to as an inner surface 14111a.
  • the inner surface 14111a is an example of the first inner surface 141a according to the embodiment of the present invention.
  • the pair of side plate portions 14112 and 14112 are connected to both ends of the main plate portion 14111 in the Z direction. That is, one side plate portion 14112 and the other side plate portion 14112 are separated in the Z direction.
  • the pair of side plate portions 14112 and 14112 protrudes from the main plate portion 14111 in the X + direction.
  • Each side plate portion 14112 has a rectangular flat plate shape that is long in the Y direction.
  • Each side plate portion 14112 is disposed along a direction perpendicular to the Z direction.
  • the thickness direction of each side plate portion 14112 is the Z direction.
  • each side plate portion 14112 is smaller than the length in the X direction and the length in the Y direction of the side plate portion 14112.
  • the pair of side plate portions 14112 and 14112 are arranged in parallel to each other.
  • the metal case component 1412 includes a main plate portion 14121 and a pair of side plate portions 14122 and 14122.
  • the metal case part 1412 is composed of one part. That is, the main plate portion 14121 and the pair of side plate portions 14122 and 14122 are integrally formed.
  • the main plate portion 14121 has a rectangular flat plate shape as a whole.
  • the main plate portion 14121 is disposed along a direction perpendicular to the X direction.
  • the thickness direction of the main plate portion 14121 is the X direction. That is, the length (thickness) of the main plate portion 14121 in the X direction is smaller than the length of the main plate portion 14121 in the Y direction and the length in the Z direction.
  • the main plate portion 14121 has a surface 14121a facing the X-direction.
  • the surface 14121a is perpendicular to the X direction.
  • the surface 14121a constitutes a part of the inner surface of the metal case 141.
  • the surface 14121a is referred to as an inner surface 14121a.
  • the inner surface 14121a faces the inner surface 14111a of the main plate portion 14111 in the X direction.
  • the inner surface 14121a corresponds to the second inner surface of the present invention.
  • the main plate portion 14121 has notches 14121b at both ends in the Y direction.
  • Each notch 14121b has a rectangular shape.
  • Each notch 14121b is formed at the center of the main plate portion 14121 in the X direction.
  • the pair of side plate portions 14122 and 14122 are connected to both ends of the main plate portion 14121 in the Z direction. That is, one side plate portion 14122 and the other side plate portion 14122 are separated in the Z direction.
  • the pair of side plate portions 14122 and 14122 protrudes from the main plate portion 14121 in the X-direction. In other words, the pair of side plate portions 14122 and 14122 protrudes toward the main plate portion 14111 of the metal case component 1411 (see FIG. 7).
  • Each side plate portion 14122 has a rectangular plate shape elongated in the Z direction.
  • Each side plate portion 14122 is arranged along a direction perpendicular to the Z direction.
  • the thickness direction of each side plate portion 14122 is the Z direction.
  • each side plate portion 14122 is smaller than the length in the X direction and the length in the Y direction of the side plate portion 14122.
  • the pair of side plate portions 14122 and 14122 are arranged in parallel to each other.
  • the length in the X direction of each side plate portion 14122 is smaller than the length in the X direction of each side plate portion 14112 of the metal case component 1411.
  • one side plate portion 14122 of the metal case component 1412 is laminated with a part of one side plate portion 14112 of the metal case component 1411 in the Z direction.
  • the other side plate portion 14122 of the metal case component 1412 is laminated with a part of the other side plate portion 14112 of the metal case component 1411 in the Z direction.
  • the pair of side plate portions 14122 and 14122 are disposed outside the pair of side plate portions 14112 and 14112.
  • the pair of insulating caps 143A and 143B are installed at openings at both ends of the metal case 141 in the Y direction.
  • the insulating cap 143A and the insulating cap 143B have the same shape and size.
  • the insulating cap 143A is plane-symmetric with the insulating cap 143B with respect to a plane perpendicular to the Y direction.
  • the insulating cap 143A and the insulating cap 143B each have a plane symmetry with respect to a plane perpendicular to the Z direction.
  • the maximum length of the insulating cap 143A in the Z direction is larger than the maximum length of the insulating cap 143A in the Y direction.
  • the maximum length of the insulating cap 143A in the X direction is smaller than the maximum length of the insulating cap 143A in the Y direction.
  • the maximum length of the insulating cap 143A in the Z direction is substantially the same as the length of the metal case 141 in the Z direction.
  • the maximum length of the insulating cap 143 ⁇ / b> A in the X direction is substantially the same as the length (thickness) of the metal case 141 in the X direction.
  • the length of the insulating cap 143 ⁇ / b> A in the Y direction is significantly smaller than the length of the metal case 141 in the Y direction.
  • the insulating cap 143A has an insulating cap body 1431A and an insulating cover 1432A.
  • the insulating cap 143B includes an insulating cap main body 1431B and an insulating cover 1432B.
  • the insulating cap body 1431A, the insulating cap body 1431B, the insulating cover 1432A, and the insulating cover 1432B are made of an insulating material.
  • the insulating material is, for example, a synthetic resin.
  • the insulating cap body 1431A and the insulating cap body 1431B are formed of the same insulating material.
  • the insulating cover 1432A and the insulating cover 1432B are formed of the same insulating material.
  • the insulating material forming the insulating cap main body 1431A and the insulating cap main body 1431B may be the same as or different from the insulating material forming the insulating cover 1432A and the insulating cover 1432B.
  • the maximum length in the Z direction of the insulating cap body 1431A is larger than the maximum length in the Y direction of the insulating cap body 1431A.
  • the maximum length in the X direction of the insulating cap body 1431A is smaller than the maximum length in the Y direction of the insulating cap body 1431A.
  • the maximum length in the Z direction of the insulating cap body 1431 ⁇ / b> A is substantially the same as the length of the metal case 141 in the Z direction.
  • the maximum length in the X direction of the insulating cap main body 1431A is substantially the same as the length (thickness) of the metal case 141 in the X direction.
  • the length of the insulating cap 143 ⁇ / b> A in the Y direction is significantly smaller than the length of the metal case 141 in the Y direction.
  • the insulating cap main body 1431A has a thin portion 14311 and a pair of thick portions 14312 and 14312.
  • the insulating cap body 1431A is composed of one component. That is, the thin portion 14311 and the pair of thick portions 14312 and 14312 are integrally formed.
  • the thin portion 14311 has a substantially rectangular plate shape.
  • the thin portion 14311 is disposed along a direction perpendicular to the X direction.
  • the thickness direction of the thin portion 14311 is the X direction. That is, the length (thickness) in the X direction of the thin portion 14311 is smaller than the length in the Y direction and the length in the Z direction of the thin portion 14311.
  • the thin portion 14311 has a surface 14311a facing the X + direction.
  • the surface 14311a is perpendicular to the X direction.
  • the pair of thick portions 14312 and 14312 are connected to both ends of the thin portion 14311 in the Z direction.
  • the length (thickness) in the X direction of the thick portion 14312 is larger than the length (thickness) in the X direction of the thin portion 14311.
  • Each thick portion 14312 has a surface 14312a facing the X + direction.
  • Each surface 14312a is not one flat surface.
  • Each surface 14312a includes a plurality of surfaces.
  • Each surface 14312a is separated from the surface 14311a of the thin portion 14311 in the X + direction.
  • the boundary between the pair of surfaces 14312a and 14312a included in the pair of thick portions 14312 and 14312 and the surface 14311a of the thin portion 14311 is stepped. As shown in FIG. 13, the boundary between the surface facing the X-direction of the pair of thick portions 14312 and 14312 and the surface facing the X-direction of the thin portion 14311 is not stepped.
  • each thick portion 14312 has a convex portion 14312c on the surface 14312a. That is, the insulating cap part 143 has a pair of convex parts 14312c on the insulating cap main body 1431A. Each convex portion 14312c protrudes in the X + direction. Each convex part 14312c is cylindrical.
  • the thick portion 14312 has a recess 14312d on the surface facing the X-direction.
  • the recess 14312d has a circular shape when viewed from the X-direction.
  • the concave portion 14312d is at a position overlapping the convex portion 14312c when viewed in the X direction.
  • the size of the concave portion 14312d is substantially the same as or slightly larger than the size of the convex portion 14312c.
  • the length (depth) of the concave portion 14312d in the X direction is smaller than the length of the convex portion 14312c in the X direction.
  • each thick portion 14312 has a through-hole 14312e that penetrates the thick portion 14312 in the X direction. That is, the insulating cap part 143 has a pair of through holes 14312e in the insulating cap main body 1431A. Each through hole 14312e passes through the center of the convex portion 14312c and the concave portion 14312d.
  • each thick part 14312 has a locking part 14312b. That is, the insulating cap body 1431A has a pair of locking portions 14312b and 14312b.
  • the pair of locking portions 14312b and 14312b are formed on the surfaces of the pair of thick portions 14312 and 14312 facing in the Z direction.
  • One locking portion 14312b protrudes in the Z direction toward the other locking portion 14312b.
  • Each locking portion 14312b is formed at the end of each thick portion 14312 in the X + direction.
  • the insulating cap body 1431A is attached to the metal case part 1411 and the metal case part 1412.
  • the insulating cap body 1431A is screwed to the metal case component 1411 using the screws 24 shown in FIG.
  • the specific procedure for screwing is as follows.
  • a part of the insulating cap main body 1431A is overlapped in the X direction with respect to the Y-direction end portion of the main plate portion 14111 of the metal case component 1411 (see FIG. 9).
  • a part of the thin part 14311 of the insulating cap body 1431A and a part of the pair of thick parts 14312 and 14312 are in contact with the end part in the Y-direction of the inner surface 14111a of the metal case component 1411.
  • the pair of thick portions 14312 and 14312 of the insulating cap body 1431A are screwed to the main plate portion 14111 of the metal case component 1411 using the screws 24 shown in FIG.
  • the insulating cap main body 1431A is screwed to the metal case component 1412 using the screws 25 shown in FIG.
  • the specific procedure for screwing is as follows.
  • a part of the insulating cap body 1431A is overlapped in the X direction with respect to one end portion in the Y-direction of the main plate portion 14121 of the metal case component 1412 (see FIG. 9).
  • a part of the pair of thick portions 14312 and 14312 of the insulating cap body 1431A comes into contact with the Y-direction end of the inner surface 14121a of the metal case component 1412.
  • the thin portion 14311 of the insulating cap body 1431A does not contact the metal case component 1412.
  • the pair of thick portions 14312 and 14312 of the insulating cap main body 1431A are screwed to the main plate portion 14121 of the metal case component 1412 using the screws 25 shown in FIG.
  • the insulating cap body 1431B is also attached to the metal case part 1411 and the metal case part 1412. Similar to the insulating cap main body 1431A, the insulating cap main body 1431B is screwed to the metal case component 1411 and the metal case component 1412 using the screw 24 and the screw 25 shown in FIG.
  • the maximum length of the insulating cover 1432A in the Z direction is larger than the maximum length of the insulating cover 1432A in the Y direction.
  • the maximum length in the X direction of the insulating cover 1432A is smaller than the maximum length in the Y direction of the insulating cover 1432A.
  • the maximum length of the insulating cover 1432A in the Z direction is smaller than the maximum length of the insulating cap body 1431A in the Z direction.
  • the maximum length in the X direction of the insulating cover 1432A is slightly smaller than the maximum length in the X direction of the insulating cap main body 1431A.
  • the maximum length in the Y direction of the insulating cover 1432A is larger than the maximum length in the Y direction of the insulating cap body 1431A.
  • the maximum length of the insulating cover 1432A in the Y direction is significantly smaller than the length of the metal case 141 in the Y direction.
  • the insulating cover 1432A has a main plate portion 14321 and a pair of side plate portions 14322 and 14322.
  • the insulating cover 1432A is composed of one component. That is, the main plate portion 14321 and the pair of side plate portions 14322 and 14322 are integrally formed.
  • the main plate portion 14321 has a rectangular flat plate shape.
  • the main plate portion 14321 is disposed along a direction perpendicular to the X direction.
  • the thickness direction of the main plate portion 14321 is the X direction. That is, the length (thickness) in the X direction of the main plate portion 14321 is smaller than the length in the Y direction and the length X direction in the Z direction of the main plate portion 14321.
  • the length of the main plate portion 14321 in the Z direction is larger than the length of the main plate portion 14321 in the Y direction. As shown in FIGS.
  • the length in the Z direction of the main plate portion 14321 is the same as or substantially the same as the length in the Z direction of the notch 14121b of the metal case component 1412.
  • the length in the Y direction of the main plate portion 14321 is larger than the length in the Y direction of the notch 14121b of the metal case component 1412.
  • the pair of side plate portions 14322 and 14322 are connected to both ends of the main plate portion 14321 in the Z direction. That is, one side plate portion 14322 and the other side plate portion 14322 are separated in the Z direction.
  • the pair of side plate portions 14322 and 14322 protrudes from the main plate portion 14321 in the X-direction. In other words, the pair of side plate portions 14322 and 14322 protrudes toward the thin portion 14311 of the insulating cap main body 1431A (see FIG. 7).
  • Each side plate portion 14322 has a locking piece 14322a. That is, the insulating cover 1432A has a pair of locking pieces 14322a and 14322a.
  • Each locking piece 14322a is at the center of the side plate portion 14322 in the Y direction.
  • Each locking piece 14322a is formed so as to be elastically deformable by a force in the Z direction.
  • Each side plate portion 14322 has a locking claw 14322b at the tip of the locking piece 14322a in the protruding direction (X-direction). That is, the insulating cover 1432A has a pair of locking claws 14322b and 14322b.
  • a part of the insulating cover 1432A is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A.
  • the insulating cover 1432A is attached to the insulating cap body 1431A.
  • the insulating cover 1432A is attached to the insulating cap body 1431A without using a fixing component such as a screw. Specifically, the insulating cover 1432A is pressed in the X direction and is fitted between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A. When fitted, the pair of locking pieces 14322a and 14322a of the insulating cover 1432A is elastically deformed.
  • the pair of locking claws 14322b and 14322b of the insulating cover 1432A are hooked on the pair of locking portions 14312b and 14312b of the insulating cap body 1431A.
  • the insulating cover 1432A is not easily detached from the insulating cap body 1431A.
  • a part of the insulating cover 1432A is disposed inside a notch 14121b formed at the end of the main plate portion 14121 of the metal case component 1412 in the Y-direction.
  • a part of the insulating cover 1432B is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431B. Similar to the insulating cover 1432A, the insulating cover 1432B is attached to the insulating cap body 1431B. Similar to the insulating cover 1432A, a part of the insulating cover 1432B is disposed inside a notch 14121b formed at the end of the main plate portion 14121 of the metal case component 1412 in the Y + direction.
  • the inner case 142 is disposed inside the metal case 141.
  • the inner case 142 is formed of a flexible film.
  • the film is made of a synthetic resin.
  • the film has a property of not allowing liquid to permeate. Since the inner case 142 is formed of a flexible film, the volume can be changed according to the pressure from the inner side.
  • the inner case 142 is less rigid than the metal case 141.
  • the inner case 142 accommodates a pair of electrode sheets 146 and 147 and three separators 148A, 148B and 148C. Further, the inner case 142 accommodates a part of the pair of lead tabs 1441 and 1451. The pair of lead tabs 1441 and 1451 are connected to the pair of electrode sheets 146 and 147. A part of the pair of lead tabs 1441 and 1451 is disposed outside the inner case 142.
  • the inner case 142 has a sealing property with a pair of lead tabs 1441 and 1451 penetrating therethrough. An electrolyte 149 is sealed in the inner case 142.
  • the inner case 142 is in surface contact with the inner surface 14111a of the metal case component 1411 in the X direction. In a state where the inner case 142 is in surface contact with the inner surface 14111a, the inner case 142 is separated from the inner surface 14121a of the metal case component 1412 in the X direction (X + direction).
  • the negative electrode sheet 146 and the positive electrode sheet 147 each have a rectangular sheet shape.
  • the negative electrode sheet 146 and the positive electrode sheet 147 are accommodated in the inner case 142 in a state of being laminated while being spread.
  • the negative electrode sheet 146 and the positive electrode sheet 147 are laminated in the X direction.
  • the negative electrode sheet 146 and the positive electrode sheet 147 are each along a direction perpendicular to the X direction. That is, the negative electrode sheet 146 and the positive electrode sheet 147 are arranged in parallel or substantially parallel to each other.
  • the length of the negative electrode sheet 146 in the Y direction is larger than the length of the negative electrode sheet 146 in the Z direction.
  • the length (thickness) of the negative electrode sheet 146 in the X direction is smaller than the length of the negative electrode sheet 146 in the Z direction.
  • the size of the positive electrode sheet 147 may be the same as or different from the size of the negative electrode sheet 146.
  • the length of the positive electrode sheet 147 in the Y direction is larger than the length of the positive electrode sheet 147 in the Z direction.
  • the length (thickness) of the positive electrode sheet 147 in the X direction is smaller than the length of the positive electrode sheet 147 in the Z direction.
  • the positive electrode sheet 147 includes a current collector and a positive electrode film covering the current collector.
  • the current collector is formed of a metal material containing aluminum.
  • the positive electrode film includes a positive electrode active material and a binder.
  • the binder is, for example, polyvinylidene fluoride.
  • the positive electrode active material includes a composite oxide of lithium and a transition metal.
  • the positive electrode active material includes lithium cobalt oxide, lithium manganate, lithium iron phosphate, an oxide containing lithium, nickel, manganese, and cobalt, and an oxide containing lithium, nickel, cobalt, and aluminum. Any one of them may be included.
  • the positive electrode sheet 147 may have a configuration other than the above as long as it can be used for the secondary cell.
  • the negative electrode sheet 146 includes a current collector and a negative electrode film that covers the current collector.
  • the current collector is made of a metal material containing copper.
  • the negative electrode film includes a negative electrode active material and a binder.
  • the binder is, for example, polyvinylidene fluoride.
  • the negative electrode active material includes, for example, carbon.
  • the negative electrode active material may include at least one of graphite, soft carbon, and hard carbon.
  • the negative electrode active material may not contain carbon. In this case, the negative electrode active material may contain, for example, lithium titanate.
  • the negative electrode sheet 146 may have a configuration other than the above as long as it can be used for the secondary cell.
  • the electrolyte 149 is an electrolytic solution.
  • the electrolytic solution is, for example, an organic electrolytic solution in which a lithium salt is dissolved in an organic solvent.
  • the organic solvent is, for example, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, or ethyl methyl carbonate.
  • the lithium salt include lithium hexafluorophosphate, lithium borofluoride, and lithium perchlorate.
  • the electrolyte 149 may be gelled by adding a polymer to the organic electrolytic solution. Examples of the polymer include polyethylene oxide, polypropylene oxide, and polyvinylidene fluoride.
  • Each of the separators 148A, 148B, 148C has a rectangular sheet shape.
  • Separator 148A, 148B, 148C has the same shape and size.
  • the separators 148A, 148B, and 148C are along the direction perpendicular to the X direction.
  • the separators 148A, 148B, 148C and the pair of electrode sheets 146, 147 are arranged in parallel or substantially in parallel.
  • the separator 148 ⁇ / b> A is disposed between the negative electrode sheet 146 and the metal case component 1412.
  • the separator 148 ⁇ / b> B is disposed between the negative electrode sheet 146 and the positive electrode sheet 147.
  • the separator 148 ⁇ / b> C is disposed between the positive electrode sheet 147 and the metal case component 1411.
  • the separators 148A, 148B, and 148C overlap the entire negative electrode sheet 146, respectively.
  • the separators 148A, 148B, and 148C overlap the entire positive electrode sheet 147, respectively.
  • Separator 148A and separator 148C may be omitted.
  • the separators 148A, 148B, 148C are formed of the same material.
  • the separators 148A, 148B, 148C are made of, for example, polypropylene.
  • the structures of the separators 148A, 148B, and 148C are structures that can hold a liquid.
  • the structure of the separators 148A, 148B, and 148C is, for example, a porous structure having a plurality of fine holes.
  • the liquid electrolyte 149 is immersed in the separators 148A, 148B, and 148C.
  • the negative electrode sheet 146 may be in contact with the electrolyte 149 by being in contact with the separator 148B or / and the separator 148C.
  • the negative electrode sheet 146 may be in contact with the electrolyte 149 present in the gap between the separator 148B and the negative electrode sheet 146 and / or the gap between the separator 148C and the negative electrode sheet 146.
  • the positive electrode sheet 147 may be in contact with the electrolyte 149 by being in contact with the separator 148A or / and the separator 148B.
  • the positive electrode sheet 147 may be in contact with the electrolyte 149 present in the gap between the separator 148A and the positive electrode sheet 147 or / and the gap between the separator 148B and the positive electrode sheet 147.
  • the pair of electrode sheets 146 and 147 are in contact with the electrolyte 149.
  • the pair of cell terminals 144 and 145 are disposed on both sides of the pair of electrode sheets 146 and 147 in the Y direction.
  • the cell terminal 144 is electrically connected to the negative electrode sheet 146
  • the cell terminal 145 is electrically connected to the positive electrode sheet 147.
  • the cell terminal 144 has the lead tab 1441 and the external terminal 1442
  • the cell terminal 145 has the lead tab 1451 and the external terminal 1452.
  • the pair of lead tabs 1441, 1451 are connected to both ends of the pair of electrode sheets 146, 147 in the Y direction.
  • the lead tabs 1441 and 1451 have a rectangular sheet shape.
  • the pair of lead tabs 1441 and 1451 are connected to the center portion in the Z direction of the pair of electrode sheets 146 and 147 (see FIG. 8).
  • the lead tab 1441 is connected to the current collector of the negative electrode sheet 146.
  • the lead tab 1441 is formed integrally with the current collector of the negative electrode sheet 146.
  • the lead tab 1441 is formed of a metal material containing copper.
  • the lead tab 1451 is connected to the current collector of the positive electrode sheet 147.
  • the lead tab 1451 is formed integrally with the current collector of the positive electrode sheet 147.
  • the lead tab 1451 is formed of a metal material containing aluminum.
  • a part of the lead tab 1441 protrudes from the inner case 142 in the Y-direction.
  • a part of the lead tab 1441 is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A.
  • a part of the lead tab 1441 overlaps the thin portion 14311 of the insulating cap body 1431A.
  • a part of the lead tab 1451 protrudes from the inner case 142 in the Y + direction. That is, a part of the lead tab 1451 protrudes in a direction opposite to the direction in which a part of the lead tab 1441 protrudes from the inner case 142.
  • a part of the lead tab 1451 is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431B. When viewed in the X direction, a part of the lead tab 1451 overlaps the thin portion 14311 of the insulating cap body 1431B.
  • the pair of external terminals 1442 and 1452 is disposed outside the inner case 142.
  • the pair of external terminals 1442 and 1452 are installed on the insulating cap portion 143. More specifically, the pair of external terminals 1442 and 1452 are installed on the pair of insulating cap bodies 1431A and 1431B.
  • the external terminal 1442 constitutes a part of the end surface in the Y-direction of the metal case type secondary cell 14, and the external terminal 1452 constitutes a part of the end face in the Y + direction of the metal case type secondary cell 14.
  • Openings at both ends in the Y direction of the metal case 141 are closed by a pair of insulating caps 143A and 143B and a pair of external terminals 1442 and 1452.
  • the metal case 141 may not be able to ensure as high a sealing property as the inner case 142.
  • the space inside the metal case 141 and outside the inner case 142 may allow air to communicate with the space outside the metal case 141.
  • External terminal 1442 is connected to lead tab 1441.
  • the external terminal 1442 is a separate member from the lead tab 1441.
  • the external terminal 1452 is connected to the lead tab 1451.
  • the external terminal 1452 is a separate member from the lead tab 1451.
  • External terminal 1442 and external terminal 1452 are each formed of a metal material.
  • External terminal 1442 is formed of a metal material containing copper.
  • the external terminal 1452 is formed of a metal material containing aluminum.
  • External terminal 1442 and external terminal 1452 have the same shape and size. Hereinafter, the external terminal 1442 will be described, and the description of the external terminal 1452 will be omitted.
  • the external terminal 1442 is L-shaped when viewed in the Z + direction.
  • the external terminal 1442 includes an intermediate connection portion 14421 and an external connection portion 14422.
  • the external terminal 1442 is composed of one component. That is, the intermediate connection portion 14421 and the external connection portion 14422 are integrally formed.
  • the intermediate connection portion 14421 has a rectangular flat plate shape.
  • the intermediate connection portion 14421 is disposed along a direction perpendicular to the X direction.
  • the thickness direction of the intermediate connection portion 14421 is the X direction. That is, the length (thickness) of the intermediate connection portion 14421 in the X direction is smaller than the length of the intermediate connection portion 14421 in the Y direction and the length in the Z direction.
  • the external connection portion 14422 is connected to the Y-direction end of the intermediate connection portion 14421.
  • the length of the external connection portion 14422 in the Z direction is larger than the length of the intermediate connection portion 14421 in the Z direction.
  • the intermediate connection portion 14421 is connected to the center portion in the Z direction of the external connection portion 14422.
  • the intermediate connection portion 14421 is connected to the X-direction end of the external connection portion 14422.
  • the external connection portion 14422 has a rectangular flat plate shape.
  • the external connection portion 14422 is disposed along a direction perpendicular to the Y direction.
  • the thickness direction of the external connection portion 14422 is the Y direction. That is, the length (thickness) of the external connection portion 14422 in the Y direction is smaller than the length of the external connection portion 14422 in the X direction and the length in the Z direction.
  • the external connection portion 14422 has a surface 14422a facing the Y-direction. That is, the surface 14422a faces a direction perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147.
  • the surface 14422a is referred to as a connection surface 14422a.
  • the connection surface 14422a is perpendicular to the Y direction.
  • the connection surface 14422a is an example of the connection surface 144a according to the embodiment of the present invention.
  • the length of the intermediate connecting portion 14421 in the Z direction is the same as or substantially the same as the length of the lead tab 1441 in the Z direction.
  • the length of the external connection portion 14422 in the Z direction is smaller than the maximum length of the insulating cap body 1431A in the Z direction.
  • the length of the external connection portion 14422 in the X direction is smaller than the maximum length of the insulating cap body 1431A in the X direction.
  • the external terminal 1442 is installed on the insulating cap body 1431A.
  • the intermediate connection portion 14421 is disposed between the pair of thick portions 14312 and 14312 of the insulating cap main body 1431 ⁇ / b> A and contacts the surface 14311 a of the thin portion 14311.
  • the external connection portion 14422 contacts the surface of the pair of thick portions 14312 and 14312 of the insulating cap main body 1431A facing in the Y-direction.
  • a connection surface 14422 a of the external connection portion 14422 is exposed to the outside of the metal case 141.
  • the connection surface 14422a of the external connection portion 14422 is disposed at the end of the metal case type secondary cell 14 in the Y direction (Y-direction).
  • External terminal 1442 is attached to insulating cap body 1431A.
  • the external terminal 1442 is screwed to the insulating cap body 1431A using the screw 26 shown in FIG.
  • the specific procedure for screwing is as follows.
  • the intermediate connection portion 14421 of the external terminal 1442 is inserted in the Y direction between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A (see FIG. 9).
  • the external terminal 1442 is inserted until the external connection portion 14422 contacts the pair of thick portions 14312 and 14312. Then, the external connection portion 14422 of the external connection portion 14422 is screwed to the pair of thick portions 14312 and 14312 of the insulating cap body 1431A using the screw 26 shown in FIG.
  • the intermediate connection portion 14421 of the external terminal 1442 is in surface contact with a part of the lead tab 1441 in the X direction.
  • An intermediate connection portion 14421 of the external terminal 1442 is connected to the lead tab 1441. Specifically, it is bonded by welding.
  • the external terminal 1452 has an intermediate connection portion 14521 and an external connection portion 14522. Similar to the external connection portion 14422, the external connection portion 14522 has a connection surface 14522a. Similar to the connection surface 14422a, the connection surface 14522a is exposed to the outside of the metal case 141. The connection surface 14522a is disposed at the end of the metal case type secondary cell 14 in the Y direction (Y + direction). The connection surface 14522a is an example of the connection surface 145a according to the embodiment of the present invention.
  • the external terminal 1452 is screwed to the insulating cap body 1431B using the screw 26 shown in FIG. Similar to the external terminal 1442, the intermediate connection portion 14521 of the external terminal 1452 is connected to the lead tab 1451.
  • the insulating cap part 143 included in one of the two metal case type secondary cells 14 adjacent in the X direction is in contact with the insulating cap part 143 included in the other in the X direction.
  • the insulating cap 143A included in one of the two metal case-type secondary cells 14 adjacent in the X direction is in contact with the insulating cap 143B included in the other in the X direction. This applies to any two metal case type secondary cells 14 adjacent in the X direction among the plurality of metal case type secondary cells 14.
  • At least one convex portion 14312c included in one of two insulating cap portions 143 adjacent in the X direction is fitted into at least one concave portion 14312d included in the other.
  • Four convex portions 14312c included in one of the two insulating cap portions 143 adjacent in the X direction are fitted into four concave portions 14312d included in the other insulating cap portion 143.
  • the pair of convex portions 14312c and 14312c included in the insulating cap 143A is fitted into the pair of concave portions 14312d and 14312d included in the insulating cap 143B adjacent to the insulating cap 143A in the X direction.
  • the plurality of metal case-type secondary cells 14 is displaced in the Y direction and the Z direction.
  • the length (depth) of the concave portion 14312d in the X direction is smaller than the length of the convex portion 14312c in the X direction. Therefore, the contact portions of the two insulating cap portions 143 adjacent in the X direction are only the four convex portions 14312c and the four concave portions 14312d.
  • a bolt 16 (shaft member) is inserted into at least one through-hole 14312e formed in the insulating cap portion 143 included in each of the plurality of metal case type secondary cells 14.
  • the through hole 14312e is formed at a position passing through the convex portion 14312c and the concave portion 14312d.
  • bolts 16 are respectively inserted into four through holes 14312 e formed in the insulating cap portion 143 included in each of the plurality of metal case type secondary cells 14. .
  • a nut 18 is attached to the tip of each bolt 16.
  • the plurality of metal case type secondary cells 14 are fixed. Therefore, a plurality of metal case type secondary cells 14 can be handled integrally.
  • the metal case 141 included in one of the two metal case-type secondary cells 14 adjacent in the X direction is separated from the metal case 141 included in the other in the X direction. Yes.
  • the multiple metal case type secondary cells 14 are electrically connected in series. Details will be described below. As shown in FIG. 3, among the plurality of metal case type secondary cells 14, the insulating cap main body 1431A of the metal case type secondary cell 14 disposed at the end in the X + direction is on the Y-direction side. Accordingly, among the plurality of metal case type secondary cells 14, the cell terminal 144 of the metal case type secondary cell 14 disposed at the end in the X + direction is also on the Y-direction side. Among the plurality of metal case type secondary cells 14, the cell terminals 144 of the metal case type secondary cells 14 arranged at the end in the X + direction are electrically connected to the bus bar 19.
  • the bus bar 19 is in contact with the connection surface 14422a of the cell terminal 144.
  • the connection surface 14422a faces the Y-direction.
  • the bus bar 19 is attached to the external terminal 1442 using a screw 26 that attaches the external terminal 1442 to the insulating cap body 1431A.
  • the bus bar 19 is formed of a metal material containing copper.
  • the bus bar 19 has an L-shaped plate shape when viewed in the Z direction.
  • the bus bar 19 has a busbar connection portion 19a protruding in the Y-direction.
  • the bus connection part 19 a is connected to the negative electrode bus 22.
  • the bus bar connecting portion 19a is bonded to the negative electrode bus bar 22 by welding, for example.
  • the negative electrode bus 22 is electrically connected to the assembled battery terminal 12.
  • the insulating cap body 1431B of the metal case type secondary cell 14 disposed at the end in the X-direction is on the Y + direction side. Therefore, among the plurality of metal case type secondary cells 14, the cell terminal 145 of the metal case type secondary cell 14 disposed at the end in the X-direction is also on the Y + direction side.
  • the cell terminals 145 of the metal case type secondary cells 14 arranged at the end in the X-direction are electrically connected to the bus bar 21.
  • the bus bar 21 is in contact with the connection surface 14522a of the cell terminal 145.
  • the connection surface 14522a faces the Y + direction.
  • the bus bar 21 is attached to the external terminal 1452 using a screw 26 that attaches the external terminal 1452 to the insulating cap body 1431B.
  • Bus bar 21 is formed of a metal material containing aluminum.
  • the bus bar 21 has an L-shaped plate shape when viewed in the Z direction.
  • the bus bar 21 has a busbar connection portion 21a protruding in the Y + direction.
  • the bus connection part 21 a is connected to the positive electrode bus 23.
  • the bus bar connecting portion 21a is bonded to the positive electrode bus bar 23 by welding, for example.
  • the positive electrode bus 23 is electrically connected to the assembled battery terminal 13.
  • the cell terminals 144 other than the cell terminals 144 connected to the bus bar 19 are respectively It is electrically connected to the bus bar 20.
  • the cell terminals 145 other than the cell terminals 145 connected to the bus bar 21 are electrically connected to the bus bar 20.
  • Each bus bar 20 is connected to a cell terminal 144 included in one of the two metal case-type secondary cells 14 adjacent in the X direction and a cell terminal 145 included in the other.
  • Each bus bar 20 is in contact with the connection surface 14422a of the cell terminal 144 included in one of the two metal case-type secondary cells 14 adjacent in the X direction and the connection surface 14522a of the cell terminal 145 included in the other.
  • the plurality of metal case type secondary cells 14 are electrically connected in series by a bus bar 20.
  • the plurality of bus bars 20 have the same shape and size. Each bus bar 20 has a rectangular flat plate shape. Each bus bar 20 is attached to the external terminal 1442 using a screw 26 for attaching the external terminal 1442 to the insulating cap main body 1431A. Each bus bar 20 is attached to the external terminal 1452 using a screw 26 for attaching the external terminal 1452 to the insulating cap body 1431B.
  • the plurality of bus bars 20 are formed of the same material.
  • the material of each bus bar 20 is different between a portion connected to the connection surface 14422 a of the external terminal 1442 and a portion connected to the connection surface 14522 a of the external terminal 1452.
  • a portion of the bus bar 20 that is connected to the connection surface 14422a of the external terminal 1442 is formed of a metal material containing copper.
  • a portion of the bus bar 20 that is connected to the connection surface 14522a of the external terminal 1452 is formed of a metal material containing aluminum.
  • the inner case 142 is in surface contact with the inner surface 14111a of the metal case 141. On the other hand, the inner case 142 is separated from the inner surface 14121a facing the inner surface 14121a of the metal case 141. Since there is a gap between the inner case 142 and the inner surface 14121a of the metal case 141, expansion of the inner case 142 due to charging / discharging of the metal case type secondary cell 14 can be allowed. Expansion of the inner case 142 is allowed, for example, up to about 10% of the volume of the initial inner case 142.
  • the metal case 141 included in one of the two metal case type secondary cells 14 adjacent in the X direction is separated from the metal case 141 included in the other in the X direction.
  • the charging / discharging of the metal case-type secondary cell 14 is performed. This makes it easier to release the heat generated by. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
  • the insulating cap part 143 included in one of the two metal case-type secondary cells 14 adjacent in the X direction is in contact with the insulating cap part 143 included in the other in the X direction.
  • At least one convex portion 14312c included in one of the two insulating cap portions 143 adjacent in the X direction is fitted into at least one concave portion 14312d included in the other.
  • the plurality of metal case type secondary cells 14 can be prevented from being displaced in a direction perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. Therefore, the plurality of metal case type secondary cells 14 can be easily stacked in the X direction.
  • the structure which ensures a clearance gap between metal cases 141 can be implement
  • the pair of cell terminals 144 and 145 included in each of the plurality of metal case type secondary cells 14 is a pair of flat electrode sheets in a direction perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. 146 and 147 are arranged on both sides. With this configuration, the pair of cell terminals 144 and 145 is disposed on one side of the pair of flat electrode sheets 146 and 147 in the direction perpendicular to the X direction, or the pair of cell terminals 144 and 145. However, as compared with a case where a pair of electrode sheets 146 and 147 are arranged side by side in the X direction, connection parts (19 to 23) for connecting a plurality of metal case type secondary cells 14 in series or in parallel.
  • the connecting part can have a structure that does not disturb the heat dissipation of the plurality of metal case type secondary cells 14 as much as possible. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
  • a pair of connection surfaces 14422a and 14522a of a pair of cell terminals 144 and 145 included in each of the plurality of metal case type secondary cells 14 is perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. Facing the direction. If the pair of connection surfaces 14422a and 14522a face the X direction, a connection component for connecting the plurality of metal case type secondary cells 14 in series is unnecessary, or the structure of this connection component is Can be simple. However, the structure of the connection component for connecting the plurality of metal case type secondary cells 14 in parallel becomes complicated.
  • connection parts 14422a and 14522a are oriented in the direction perpendicular to the X direction, a plurality of metal case-type secondary cells 14 can be connected in series or in parallel.
  • the structure of the connection parts (19 to 23) for connecting the case type secondary cell 14 can be simplified. Since the structure of the connecting part is simple, the connecting part can have a structure that does not disturb the heat dissipation of the plurality of metal case type secondary cells 14 as much as possible. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
  • the pair of cell terminals 144 and 145 include a pair of lead tabs 1441 and 1451, a pair of lead tabs 1441 and 1451, and a pair of external terminals 1442 and 1452 which are separate members. Therefore, the design freedom of the pair of cell terminals 144 and 145 can be improved. Therefore, the metal case type secondary cell 14 can have a structure in which heat generated by charging and discharging is more easily released. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
  • the metal case type secondary cell 14 corresponds to the flat can battery 14 of the basic application (Japanese Patent Application No. 2016-243010) of the present application.
  • the metal case 141 corresponds to a portion of the outer case 141 of the basic application excluding the insulating case portions 1413A and 1413B, the terminals 1414A and 1414B, and the covers 1415A and 1415B.
  • the metal case parts 1411 and 1412 correspond to the metal case parts 1411 and 1412 of the basic application.
  • the main plate portion 14111 and the side plate portion 14112 correspond to the flat plate 14111 and the side plate 14112 of the basic application, respectively.
  • the main plate portion 14121 and the side plate portion 14122 correspond to the flat plate 14121 and the side plate 14122 of the basic application, respectively.
  • the insulating cap bodies 1431A and 1431B correspond to the insulating case portions 1413A and 1413B of the basic application, respectively.
  • the thin portion 14311 and the thick portion 14312 correspond to the flat plate 14131 and the side portion 14132 of the basic application, respectively.
  • the insulating covers 1432A and 1432B correspond to the covers 1415A and 1415B of the basic application, respectively.
  • the main plate portion 14321 and the side plate portion 14322 correspond to the flat plate 14151 and the side portion 14152 of the basic application, respectively.
  • the external terminals 1442 and 1452 correspond to the terminals 1414A and 1414B of the basic application, respectively.
  • the intermediate connection parts 14421 and 14521 all correspond to the flat plate 14141 of the basic application, and the external connection parts 14422 and 14522 all correspond to the side wall 14142 of the basic application.
  • the electrode sheet 146 corresponds to the electrode 1421 of the basic application
  • the electrode sheet 147 corresponds to the electrode 1422 of the basic application.
  • the electrode sheet 146 is a negative electrode
  • the electrode 1421 of the basic application is a positive electrode.
  • Part of the description of the material of the negative electrode sheet 146 is described as the material of the negative electrode 1422 in the basic application
  • part of the description of the material of the positive electrode sheet 147 is described as the material of the positive electrode 1421 in the basic application.
  • FIG. 7 of the basic application is a schematic cross-sectional view of the flat can battery 14 and corresponds to FIG. 9 of the present application.
  • the cover 1415A of FIG. 7 of the basic application is displayed with a shorter length in the left-right direction on the paper surface than the insulating cover 1432A of FIG. 9 of the present application.
  • FIG. 7 of the basic application is a diagram schematically displayed, and the length of the insulating cover 1432A of the present application is not different from the length of the cover 1415A of the basic application.
  • FIG. 17 is an example in which a plurality of metal case type secondary cells 14 of a specific example of the above-described embodiment are connected in parallel.
  • the plurality of insulating caps 143 ⁇ / b> A included in the plurality of metal case type secondary cells 14 are stacked in the stacking direction of the metal case type secondary cells 14.
  • the plurality of insulating caps 143 ⁇ / b> B included in the plurality of metal case type secondary cells 14 are also stacked in the stacking direction of the metal case type secondary cells 14.
  • the insulating caps 143A of the two adjacent metal case type secondary cells 14 are in contact with each other.
  • the insulating caps 143B of the two adjacent metal case type secondary cells 14 are also in contact with each other.
  • the plurality of cell terminals 144 included in the plurality of metal case type secondary cells 14 are arranged in the stacking direction of the metal case type secondary cells 14.
  • the plurality of cell terminals 145 included in the plurality of metal case type secondary cells 14 are also arranged in the stacking direction of the metal case type secondary cells 14.
  • a plurality of cell terminals 144 included in the plurality of metal case type secondary cells 14 are connected to one bus bar 201.
  • a plurality of cell terminals 145 included in the plurality of metal case type secondary cells 14 are connected to one bus bar 202.
  • the bus bar 201 is in contact with the connection surfaces 14422a of the plurality of cell terminals 144, and the bus bar 202 is in contact with the connection surfaces 14522a of the plurality of cell terminals 145.
  • Bus bar 201 is connected to a negative bus (not shown), and bus bar 202 is connected to a positive bus (not shown).
  • the bus bars 19, 20, 21 of the specific example of the above-described embodiment and the bus bars 201, 202 shown in FIG. 17 may be protected by a protective member formed of an insulating material.
  • the protective member may be in the form of a film or plate.
  • the multiple metal case type secondary cells 14 are fixed by bolts 16 and nuts 18.
  • the means for fixing the plurality of metal case type secondary cells in a stacked state is not limited to bolts and nuts.
  • a rubber band or a shrink pack may be used.
  • the metal case included in one of the two metal case type secondary cells adjacent in the stacking direction of the pair of electrode sheets may be in contact with the metal case included in the other in the stacking direction.
  • the number of recesses of the insulating cap part included in each of the plurality of metal case type secondary cells of the present invention is not limited to four.
  • the number of recesses in each insulating cap may be 1 or more and 3 or less, or 5 or more. Note that the number of convex portions of each insulating cap is the same as the number of concave portions.
  • the insulating cap portions of two adjacent metal case-type secondary cells may be in contact with each other in addition to the concave portion and the convex portion.
  • the insulating cap part included in each of the plurality of metal case type secondary cells of the present invention may not have a concave part and a convex part.
  • the insulating cap parts of two adjacent metal case type secondary cells may be in contact with each other at a place that is not a concave part and a convex part.
  • the insulating cap parts of two adjacent metal case type secondary cells are a pair of electrodes. You may leave
  • the two insulating cap portions adjacent to each other in the stacking direction of the pair of electrode sheets may be in contact with each other via another member.
  • two metal cases adjacent in the stacking direction of the pair of electrode sheets may be in contact with each other through another member.
  • the metal case 141 includes two metal case parts 1411 and 1412.
  • the number of parts constituting the metal case of the present invention is not limited to two.
  • the number of parts constituting the metal case of the present invention may be one or three or more.
  • the parts constituting the metal case here do not include fixing parts such as screws.
  • a porous material may be disposed.
  • the porous material can be obtained, for example, by foaming a synthetic resin such as polyurethane.
  • both surfaces of the inner case may be in contact with the inner surface of the metal case in the stacking direction of the pair of electrode sheets. Both surfaces of the inner case may be in surface contact with the inner surface of the metal case.
  • the electrolyte 149 is an electrolytic solution.
  • the electrolyte in the present invention may be a solid electrolyte.
  • a separator having a solid electrolyte layer formed on both sides may be disposed between a pair of electrode sheets. Further, for example, one or both of the facing surfaces of the pair of electrode sheets may be covered with a solid electrolyte layer.
  • the lead tab 1441 is integrated with the current collector of the negative electrode sheet 146.
  • the lead tab connected to the negative electrode sheet may be a separate member from the current collector of the positive electrode sheet. This lead tab is connected to the current collector of the negative electrode sheet.
  • the lead tab 1451 is integrated with the current collector of the positive electrode sheet 147.
  • the lead tab connected to the positive electrode sheet may be a separate member from the current collector of the negative electrode sheet.
  • the lead tab is connected to the current collector of the positive electrode sheet.
  • the pair of lead tabs 1441 and 1451 are connected to the pair of external terminals 1442 and 1452 by welding.
  • the pair of lead tabs of the present invention may be connected to the pair of external terminals by mechanical connection means such as screws.
  • the cell terminal 144 is composed of two members, the lead tab 1441 and the external terminal 1442, and the cell terminal 145 is composed of two members, the lead tab 1451 and the external terminal 1452.
  • each cell terminal may be composed of one member.
  • Each cell terminal may be composed of three or more members.
  • the pair of connection surfaces included in each of the plurality of metal case type secondary cells may not face the direction perpendicular to the stacking direction of the pair of electrode sheets.
  • the pair of connection surfaces may face the stacking direction of the pair of electrode sheets.
  • a connection part for connecting a plurality of metal case type secondary cells in series is not required, or the structure of the connection part can be simplified.
  • the pair of cell terminals 144 and 145 included in each of the plurality of metal case-type secondary cells 14 is in a direction perpendicular to the stacking direction of the pair of electrode sheets 146 and 147.
  • a pair of flat electrode sheets 146 and 147 are arranged on both sides.
  • the pair of cell terminals included in each of the plurality of metal case-type secondary cells is only on one side of the pair of flat electrode sheets in the direction perpendicular to the stacking direction of the pair of electrode sheets. It may be arranged. In this case, the lead tab connected to the positive electrode sheet and the lead tab connected to the negative electrode sheet protrude from the inner case in the same direction.
  • a pair of cell terminals included in each of the plurality of metal case-type secondary cells is When disposed only on one side of the pair of flat electrode sheets, the insulating cap portion is also disposed only on one side of the pair of flat electrode sheets in a direction perpendicular to the stacking direction of the pair of electrode sheets.
  • the insulating cap part may be composed of one component or a plurality of components that are in contact with each other.
  • One pair of cell terminals included in each of the plurality of metal case type secondary cells is one pair in a direction perpendicular to the stacking direction of the pair of electrode sheets.
  • the metal case When the metal case is disposed only on one side of the flat electrode sheet, the metal case may have an opening only at one end in a direction perpendicular to the stacking direction of the pair of electrode sheets. You may have an opening part in the both ends in the direction perpendicular
  • the insulating cap portion is installed only in one of the openings at both ends of the metal case. The other of the openings at both ends of the metal case is closed by a member formed of a material other than metal.
  • the assembled battery 10 includes a battery management device.
  • the assembled battery of the present invention may not include a battery management device.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

This battery pack, which comprises a plurality of secondary cells, is suppressed in temperature increase that is caused by charge/discharge with a large current. Each one of a plurality of metal case-type secondary cells (14) in this battery pack (10) comprises an inner case (142) which is arranged within a metal case (141) and is formed of a flexible synthetic resin film. This inner case (142) contains a pair of electrode sheets (146, 147) that are laminated in a flat state; and an electrolyte (149) is sealed in this inner case (142). A first inner surface (141a) of the metal case (141) and the inner case (142) are in area contact with each other in the lamination direction of the pair of flat electrode sheets (146, 147).

Description

組電池Assembled battery
　本発明は、複数の二次セルを備える組電池（assembled battery）に関する。 The present invention relates to an assembled battery including a plurality of secondary cells.
　モータを駆動源とする電動車両は、モータに電力を供給するための組電池を備える。このような組電池には、大電流で充放電可能な能力が求められる。大電流で充放電する組電池の一例として、特開２００８－２４３５２６号公報に記載の電池モジュールがある。この公報に記載の電池モジュールは、複数のサブモジュールと、複数のサブモジュールを収容する外装ケースを備える。各サブモジュールは、複数の二次セル（単電池）と、複数の二次セルを保持するサブモジュールホルダーを備える。各二次セルは、セパレータと共に巻き回された正極シートおよび負極シートと、これらを収容する金属ケースとを有する。 An electric vehicle using a motor as a drive source includes an assembled battery for supplying electric power to the motor. Such an assembled battery is required to be capable of being charged and discharged with a large current. As an example of an assembled battery that is charged and discharged with a large current, there is a battery module described in Japanese Patent Application Laid-Open No. 2008-243526. The battery module described in this publication includes a plurality of submodules and an outer case that houses the plurality of submodules. Each submodule includes a plurality of secondary cells (single cells) and a submodule holder that holds the plurality of secondary cells. Each secondary cell has a positive electrode sheet and a negative electrode sheet that are wound together with a separator, and a metal case that houses them.
特開２００８－２４３５２６号公報JP 2008-243526 A
　上記公報に記載の組電池（電池モジュール）は、複数のサブモジュールを収容する外装ケースの一面に、ハニカム構造体を備える。このハニカム構造体の空洞から外装ケース内に冷却風を送り込むことにより、二次セルを冷却できるようになっている。しかしながら、冷却風により二次セルを冷却しても、上記公報に記載の組電池において、大電流での充放電によって発熱した二次セルを十分に冷却することは難しい。 The assembled battery (battery module) described in the above publication includes a honeycomb structure on one surface of an outer case that houses a plurality of submodules. The secondary cells can be cooled by sending cooling air from the cavities of the honeycomb structure into the outer case. However, even if the secondary cell is cooled by cooling air, it is difficult to sufficiently cool the secondary cell that generates heat due to charging / discharging with a large current in the assembled battery described in the above publication.
　本発明の目的は、複数の二次セルを備える組電池において、大電流で充放電することによる温度上昇を抑制することである。 An object of the present invention is to suppress an increase in temperature caused by charging / discharging with a large current in an assembled battery including a plurality of secondary cells.
　本願発明者らは、組電池が大電流で充放電したときの二次セルの放熱状況について研究した。本願発明者らは、二次セルが有する正極シートおよび負極シートの配置に着目した。上記公報の二次セルにおいて、正極シートおよび負極シートは、巻かれた状態で金属ケースに収容されている。そのため、巻かれた状態の正極シートおよび負極シートの外周部分は、金属ケースから放熱しやすい。一方、巻かれた状態の正極シートおよび負極シートの巻きの中央部は、熱がこもりやすいことに気付いた。 The inventors of the present application studied the heat dissipation state of the secondary cell when the assembled battery was charged and discharged with a large current. The inventors of the present application paid attention to the arrangement of the positive electrode sheet and the negative electrode sheet that the secondary cell has. In the secondary cell of the above publication, the positive electrode sheet and the negative electrode sheet are accommodated in a metal case in a rolled state. Therefore, the outer peripheral part of the wound positive electrode sheet and negative electrode sheet is likely to radiate heat from the metal case. On the other hand, it was noticed that the central part of the wound positive electrode sheet and negative electrode sheet was likely to accumulate heat.
　本願発明者は、この知見から、正極シートおよび負極シートを巻かれた状態で金属ケースに収容するのではなく、正極シートおよび負極シートを平坦な状態で金属ケースに収容することを思い付いた。平坦な状態で積層された正極シートおよび負極シートは、全面が金属ケースに近くなる。それにより、組電池が大電流で充放電しても二次セルが放熱しやすい。 The inventor of this application has come up with the idea that the positive electrode sheet and the negative electrode sheet are accommodated in the metal case in a flat state, rather than being accommodated in the metal case in a state where the positive electrode sheet and the negative electrode sheet are wound. The entire surface of the positive electrode sheet and the negative electrode sheet laminated in a flat state is close to a metal case. Thereby, even if the assembled battery is charged and discharged with a large current, the secondary cell easily dissipates heat.
　ここで、電解質が電解液の場合、正極シートおよび負極シートは、電解液に浸漬された状態で使用される。上記公報のように、正極シートおよび負極シートを収容する金属ケース内に電解液が直接入れられる場合、金属ケースは電解液を封入するための密封性が要求される。しかしながら、平坦な正極シートおよび負極シートを収容する金属ケースをシールする場合、巻かれた状態の正極シートおよび負極シートを収容する金属ケースに比べて、シールするために溶接や接着など施す箇所の長さが長くなる。そのため、密封性を確保しにくい。そのため、巻かれた状態の正極シートおよび負極シートを収容する金属ケースに比べて、平坦な正極シートおよび負極シートを収容する金属ケースは、密封性を確保することが難しい。 Here, when the electrolyte is an electrolytic solution, the positive electrode sheet and the negative electrode sheet are used in a state of being immersed in the electrolytic solution. As in the above publication, when the electrolytic solution is directly put into the metal case that accommodates the positive electrode sheet and the negative electrode sheet, the metal case is required to have a sealing property for enclosing the electrolytic solution. However, when sealing a metal case that accommodates a flat positive electrode sheet and a negative electrode sheet, the length of the portion to be welded or bonded to seal is longer than that of a metal case that accommodates a rolled positive electrode sheet and negative electrode sheet. Lengthens. Therefore, it is difficult to ensure sealing performance. Therefore, it is difficult for the metal case that accommodates the flat positive electrode sheet and the negative electrode sheet to ensure hermeticity as compared to the metal case that accommodates the positive electrode sheet and the negative electrode sheet that are wound.
　そこで、本願発明者らは、二次セルの密封性を確保するための構造について、鋭意検討した。その結果、二次セルのケースを二重構造にして、金属ケースの内側に、金属ケースよりも密閉性を確保しやすい可撓性を有するケースを設けることを思い付いた。それにより、可撓性を有する内側のケースによって、二次セルの密封性を確保しつつ、外側の金属ケースによって、二次セルの放熱性を確保できることに気付いた。本発明は、以上の知見に基づいて完成されたものである。 Therefore, the inventors of the present application have intensively studied a structure for ensuring the sealing performance of the secondary cell. As a result, the inventors have come up with the idea that the case of the secondary cell has a double structure, and a flexible case that is easier to secure the sealing than the metal case is provided inside the metal case. Accordingly, it has been found that the heat dissipation of the secondary cell can be secured by the outer metal case while the sealing property of the secondary cell is secured by the flexible inner case. The present invention has been completed based on the above findings.
　（１）本発明の組電池は、１枚の正極シートと１枚の負極シートで構成される１対の電極シートと、前記１対の電極シートを収容する金属製の金属ケースと、絶縁材料で形成され、前記金属ケースの開口部に設置される絶縁キャップ部と、前記１対の電極シートに電気的に接続され、それぞれの一部が前記絶縁キャップ部に設置され、前記金属ケースの外部に露出する１対の接続面を有する１対のセル端子と、を有する金属ケース型二次セルを複数備える組電池である。前記複数の金属ケース型二次セルの各々は、前記金属ケースの内側に配置され、可撓性を有する合成樹脂製のフィルムで形成され、平坦な状態で積層された前記１対の電極シートを収容し、前記１対の平坦な電極シートと接触するように電解質が封入され、前記１対の平坦な電極シートの積層方向において前記金属ケースの第１の内面と面接触する内側ケースを有し、前記複数の金属ケース型二次セルの各々は、前記１対の平坦な電極シートの前記積層方向における長さが、前記積層方向に垂直な方向における最小長さよりも小さいフラットボード形状であって、前記複数の金属ケース型二次セルが、前記１対の平坦な電極シートの前記積層方向に積層されている。 (1) An assembled battery according to the present invention includes a pair of electrode sheets composed of one positive electrode sheet and one negative electrode sheet, a metal case made of metal that accommodates the pair of electrode sheets, and an insulating material An insulating cap portion formed in the opening of the metal case and electrically connected to the pair of electrode sheets, each part of which is installed in the insulating cap portion and external to the metal case And a pair of cell terminals having a pair of connection surfaces exposed to the battery. Each of the plurality of metal case-type secondary cells includes the pair of electrode sheets disposed inside the metal case, formed of a flexible synthetic resin film, and laminated in a flat state. An inner case is accommodated and sealed with an electrolyte so as to be in contact with the pair of flat electrode sheets, and is in surface contact with the first inner surface of the metal case in the stacking direction of the pair of flat electrode sheets. Each of the plurality of metal case-type secondary cells has a flat board shape in which a length of the pair of flat electrode sheets in the stacking direction is smaller than a minimum length in a direction perpendicular to the stacking direction. The plurality of metal case type secondary cells are stacked in the stacking direction of the pair of flat electrode sheets.
　この構成により、本発明の組電池は、複数の金属ケース型二次セルを備える。複数の金属ケース型二次セルの各々は、１対の電極シートと、金属製の金属ケースと、内側ケースと、絶縁キャップ部と、１対のセル端子とを有する。１対の電極シートは、１枚の正極シートと１枚の負極シートで構成される。金属ケースは、１対の電極シートを収容する。絶縁キャップ部は、絶縁材料で形成され、金属ケースの開口部に設置される。１対のセル端子は、１対の電極シートに電気的に接続される。１対のセル端子は、それぞれの一部が絶縁キャップ部に設置される。それにより、１対のセル端子は、金属ケースに電気的に絶縁される。１対のセル端子は、金属ケースの外部に露出する１対の接続面を有する。複数の金属ケース型二次セルの各々が有する１対の接続面を用いて、複数の金属ケース型二次セルは直列または並列に接続される。１対の電極シートは、平坦な状態で積層されている。そのため、複数の金属ケース型二次セルの各々は、１対の平坦な電極シートの積層方向における長さが、１対の平坦な電極シートの積層方向に垂直な方向における最小長さよりも小さいフラットボード形状である。複数の金属ケース型二次セルは、１対の平坦な電極シートの積層方向に積層されている。そのため、金属ケース型二次セルの形状が、フラットボード形状であるものの、組電池の形状は、巻かれた状態の正極シートおよび負極シートを備える組電池と同様に、箱型にすることができる。 With this configuration, the assembled battery of the present invention includes a plurality of metal case type secondary cells. Each of the plurality of metal case-type secondary cells includes a pair of electrode sheets, a metal metal case, an inner case, an insulating cap portion, and a pair of cell terminals. The pair of electrode sheets is composed of one positive electrode sheet and one negative electrode sheet. The metal case accommodates a pair of electrode sheets. The insulating cap part is formed of an insulating material and is installed in the opening of the metal case. The pair of cell terminals are electrically connected to the pair of electrode sheets. A part of each of the pair of cell terminals is installed in the insulating cap part. Thereby, the pair of cell terminals are electrically insulated from the metal case. The pair of cell terminals has a pair of connection surfaces exposed to the outside of the metal case. The plurality of metal case type secondary cells are connected in series or in parallel using a pair of connection surfaces of each of the plurality of metal case type secondary cells. The pair of electrode sheets are laminated in a flat state. Therefore, each of the plurality of metal case-type secondary cells has a flat length in the stacking direction of the pair of flat electrode sheets that is smaller than the minimum length in the direction perpendicular to the stacking direction of the pair of flat electrode sheets. Board shape. The plurality of metal case type secondary cells are stacked in the stacking direction of a pair of flat electrode sheets. Therefore, although the shape of the metal case type secondary cell is a flat board shape, the shape of the assembled battery can be a box shape like the assembled battery including the positive electrode sheet and the negative electrode sheet in a wound state. .
　正極シートおよび負極シートは、平坦な状態で積層される。そのため、１対の平坦な電極シートは、金属ケースの内面とほぼ平行に配置される。つまり、平坦な正極シートは、金属ケースの内面までの最短距離がほぼ一定になる。平坦な負極シートは、金属ケースの内面までの最短距離がほぼ一定になる。そのため、１対の電極シートが巻かれた状態で配置される場合に比べて、１対の電極シートの放熱性を均一化できる。よって、組電池を大電流で充放電したときに金属ケース型二次セルが放熱しやすい。 The positive electrode sheet and the negative electrode sheet are laminated in a flat state. For this reason, the pair of flat electrode sheets are arranged substantially parallel to the inner surface of the metal case. That is, the flat positive electrode sheet has a substantially constant shortest distance to the inner surface of the metal case. A flat negative electrode sheet has a substantially constant shortest distance to the inner surface of the metal case. Therefore, the heat dissipation of the pair of electrode sheets can be made uniform as compared with the case where the pair of electrode sheets are arranged in a wound state. Therefore, when the assembled battery is charged / discharged with a large current, the metal case-type secondary cell easily radiates heat.
　しかし、金属ケースは、１対の電極シートを平坦な状態で収容する形状であるため、金属ケースによって、液体の電解質を封入するのに必要な密封性を確保することは難しい。そこで、１対の電極シートは、金属シートの内側に配置された内側シートに収容される。この内側ケースに、電解質が１対の電極シートと接触するように封入される。内側ケースは、可撓性を有する合成樹脂製のフィルムで形成される。そのため、内側ケースは、平坦な状態で積層された１対の電極シートを収容するにも関わらず、液体の電解質を封入するのに必要な密封性を確保しやすい。したがって、内側ケースによって金属ケース型二次セルの密封性を確保しつつ、金属ケースによって金属ケース型二次セルの放熱性を確保できる。さらに、内側ケースは、１対の平坦な電極シートの積層方向において金属ケースの第１の内面と面接触する。そのため、金属ケース型二次セルが充放電したときに発生する熱を、金属ケースの第１の内面から逃がすことができる。その結果、複数の金属ケース型二次セルの各々において、組電池を大電流で充放電することによる温度上昇を抑制することができる。 However, since the metal case has a shape that accommodates a pair of electrode sheets in a flat state, it is difficult to ensure the sealing property necessary for enclosing the liquid electrolyte with the metal case. Therefore, the pair of electrode sheets is accommodated in an inner sheet disposed inside the metal sheet. In the inner case, the electrolyte is sealed so as to come into contact with the pair of electrode sheets. The inner case is formed of a flexible synthetic resin film. For this reason, the inner case easily secures a sealing property necessary for enclosing the liquid electrolyte, despite accommodating a pair of electrode sheets laminated in a flat state. Therefore, the heat dissipation of the metal case type secondary cell can be ensured by the metal case while the inner case ensures the sealing property of the metal case type secondary cell. Further, the inner case is in surface contact with the first inner surface of the metal case in the stacking direction of the pair of flat electrode sheets. Therefore, the heat generated when the metal case type secondary cell is charged and discharged can be released from the first inner surface of the metal case. As a result, in each of the plurality of metal case-type secondary cells, temperature rise due to charging / discharging of the assembled battery with a large current can be suppressed.
　（２）他の観点によれば、本発明の組電池は、以下の構成を有することが好ましい。前記複数の金属ケース型二次セルの各々において、前記内側ケースが前記金属ケースの前記第１の内面と面接触している状態において、前記内側ケースが、前記金属ケースの前記第１の内面と向かい合う第２の内面から離れている。 (2) According to another aspect, the assembled battery of the present invention preferably has the following configuration. In each of the plurality of metal case type secondary cells, the inner case is in contact with the first inner surface of the metal case in a state where the inner case is in surface contact with the first inner surface of the metal case. It is away from the second inner surface facing each other.
　この構成により、内側ケースと金属ケースの第２の内面との間に隙間があることによって、金属ケース型二次セルの充放電に起因する内側ケースの膨張を許容できる。 With this configuration, since there is a gap between the inner case and the second inner surface of the metal case, the inner case can be allowed to expand due to charging / discharging of the metal case type secondary cell.
　（３）他の観点によれば、本発明の組電池は、以下の構成を有することが好ましい。前記積層方向に隣り合う２つの前記金属ケース型二次セルの一方が有する前記金属ケースが、他方が有する前記金属ケースに対して前記積層方向に離れるように、前記複数の金属ケース型二次セルが積層されている。 (3) According to another aspect, the assembled battery of the present invention preferably has the following configuration. The plurality of metal case-type secondary cells so that the metal case of one of the two metal case-type secondary cells adjacent in the stacking direction is separated from the metal case of the other in the stacking direction. Are stacked.
　この構成により、隣り合う２つの金属ケース型二次セルの一方が有する金属ケースが、他方が有する金属ケースに接触している場合と比べて、金属ケース型二次セルの充放電によって発生する熱をさらに逃がし易くなる。その結果、組電池を大電流で充放電することによる温度上昇をより抑制することができる。 With this configuration, heat generated by charging / discharging of the metal case type secondary cell is compared to the case where the metal case of one of the two adjacent metal case type secondary cells is in contact with the metal case of the other. Will be easier to escape. As a result, temperature rise due to charging / discharging of the assembled battery with a large current can be further suppressed.
　（４）他の観点によれば、本発明の組電池は、以下の構成を有することが好ましい。前記積層方向に隣り合う２つの前記金属ケース型二次セルの一方が有する前記絶縁キャップ部が、他方が有する前記絶縁キャップ部に対して前記積層方向に接触するように、前記複数の金属ケース型二次セルが積層されている。 (4) According to another aspect, the assembled battery of the present invention preferably has the following configuration. The plurality of metal case molds so that the insulating cap part of one of the two metal case type secondary cells adjacent in the stacking direction is in contact with the insulating cap part of the other in the stacking direction. Secondary cells are stacked.
　この構成により、金属ケース同士の間に隙間を確保しつつ、複数の金属ケース型二次セルを、１対の電極シートの積層方向に積層しやすい。金属ケース同士の間に隙間を確保することによって、金属ケース同士が接触している場合に比べて、金属ケース型二次セルの充放電によって発生する熱をさらに逃がし易くなる。その結果、組電池を大電流で充放電することによる温度上昇をより抑制することができる。 With this configuration, it is easy to stack a plurality of metal case type secondary cells in the stacking direction of a pair of electrode sheets while securing a gap between the metal cases. By securing a gap between the metal cases, heat generated by charging and discharging of the metal case type secondary cell can be more easily released than when the metal cases are in contact with each other. As a result, temperature rise due to charging / discharging of the assembled battery with a large current can be further suppressed.
　（５）他の観点によれば、本発明の組電池は、上述の（４）の構成に加えて、以下の構成を有することが好ましい。前記複数の金属ケース型二次セルの各々の前記絶縁キャップ部は、前記積層方向の一方の面に少なくとも１つの凸部を有し、前記積層方向の他方の面に少なくとも１つの凹部を有する。前記積層方向に隣り合う２つの前記絶縁キャップ部の一方が有する前記少なくとも１つの凸部が、他方が有する前記少なくとも１つの凹部に嵌め込まれている。 (5) According to another aspect, the assembled battery of the present invention preferably has the following configuration in addition to the above-described configuration (4). The insulating cap portion of each of the plurality of metal case type secondary cells has at least one convex portion on one surface in the stacking direction and at least one concave portion on the other surface in the stacking direction. The at least one convex portion of one of the two insulating cap portions adjacent to each other in the stacking direction is fitted into the at least one concave portion of the other.
　この構成により、複数の金属ケース型二次セルが、１対の電極シートの積層方向に垂直な方向に位置ずれするのを防止できる。よって、複数の金属ケース型二次セルを、１対の電極シートの積層方向により容易に積層できる。また、金属ケース同士の間に隙間を確保する構成をより容易に実現できる。 This configuration can prevent a plurality of metal case type secondary cells from being displaced in a direction perpendicular to the stacking direction of the pair of electrode sheets. Therefore, a plurality of metal case type secondary cells can be easily stacked in the stacking direction of the pair of electrode sheets. Moreover, the structure which ensures a clearance gap between metal cases can be implement | achieved more easily.
　（６）他の観点によれば、本発明の組電池は、以下の構成を有することが好ましい。前記複数の金属ケース型二次セルの各々が有する前記１対のセル端子が、前記積層方向に垂直な方向において前記１対の平坦な電極シートの両側に配置されている。 (6) According to another aspect, the assembled battery of the present invention preferably has the following configuration. The pair of cell terminals included in each of the plurality of metal case type secondary cells is disposed on both sides of the pair of flat electrode sheets in a direction perpendicular to the stacking direction.
　この構成により、１対のセル端子が、１対の電極シートの積層方向に垂直な方向において１対の平坦な電極シートの片側に配置されている場合、もしくは、１対のセル端子が、１対の電極シートと、１対の電極シートの積層方向に並んで配置されている場合に比べて、複数の金属ケース型二次セルを直列または並列に接続するための接続部品の構造を簡易化できる。接続部品の構造がシンプルであることにより、接続部品は、複数の金属ケース型二次セルの放熱をできるだけ妨げない構造にできる。その結果、組電池を大電流で充放電することによる温度上昇をより抑制することができる。 With this configuration, when the pair of cell terminals are arranged on one side of the pair of flat electrode sheets in the direction perpendicular to the stacking direction of the pair of electrode sheets, or when the pair of cell terminals is 1 Compared to the case where a pair of electrode sheets and a pair of electrode sheets are arranged side by side in the stacking direction, the structure of connecting parts for connecting a plurality of metal case type secondary cells in series or in parallel is simplified. it can. Since the structure of the connecting part is simple, the connecting part can have a structure that does not hinder heat dissipation of the plurality of metal case type secondary cells as much as possible. As a result, temperature rise due to charging / discharging the assembled battery with a large current can be further suppressed.
　（７）他の観点によれば、本発明の組電池は、以下の構成を有することが好ましい。前記複数の金属ケース型二次セルの各々が有する前記１対の接続面が、前記積層方向に垂直な方向を向いている。 (7) According to another aspect, the assembled battery of the present invention preferably has the following configuration. The pair of connection surfaces of each of the plurality of metal case-type secondary cells is oriented in a direction perpendicular to the stacking direction.
　仮に、１対の接続面が、１対の電極シートの積層方向、即ち、複数の金属ケース型二次セルの積層方向を向いている場合、複数の金属ケース型二次セルを直列に接続するための接続部品が不要になるか、この接続部品の構造をシンプルにできる。しかし、複数の金属ケース型二次セルを並列に接続するための接続部品の構造が複雑になる。したがって、１対の接続面が、１対の電極シートの積層方向に垂直な方向を向いていることにより、複数の金属ケース型二次セルが直列と並列のいずれに接続される場合でも、複数の金属ケース型二次セルを接続するための接続部品の構造を簡易化できる。接続部品の構造がシンプルであることにより、接続部品は、複数の金属ケース型二次セルの放熱をできるだけ妨げない構造にできる。その結果、組電池を大電流で充放電することによる温度上昇をより抑制することができる。 If a pair of connection surfaces face the stacking direction of a pair of electrode sheets, that is, the stacking direction of a plurality of metal case type secondary cells, the plurality of metal case type secondary cells are connected in series. Therefore, it is possible to simplify the structure of the connecting parts. However, the structure of the connection component for connecting a plurality of metal case type secondary cells in parallel is complicated. Therefore, even if a plurality of metal case-type secondary cells are connected in series or in parallel because the pair of connection surfaces are oriented in the direction perpendicular to the stacking direction of the pair of electrode sheets. The structure of the connection component for connecting the metal case type secondary cell can be simplified. Since the structure of the connecting part is simple, the connecting part can have a structure that does not hinder heat dissipation of the plurality of metal case type secondary cells as much as possible. As a result, temperature rise due to charging / discharging of the assembled battery with a large current can be further suppressed.
　（８）他の観点によれば、本発明の組電池は、以下の構成を有することが好ましい。前記複数の金属ケース型二次セルの各々が有する前記１対のセル端子が、それぞれの少なくとも一部が前記内側ケースの内側に配置され、前記１対の電極シートに接続された１対のリードタブと、前記１対のリードタブと別部材であって、前記１対のリードタブに接続され、前記絶縁キャップ部に設置され、前記１対の接続面を有する１対の外部端子と、を有する。 (8) According to another aspect, the assembled battery of the present invention preferably has the following configuration. The pair of cell terminals included in each of the plurality of metal case type secondary cells, a pair of lead tabs each of which is disposed at least partially inside the inner case and connected to the pair of electrode sheets And a pair of external terminals that are separate members from the pair of lead tabs, are connected to the pair of lead tabs, are installed on the insulating cap portion, and have the pair of connection surfaces.
　この構成により、１対のセル端子は、１対のリードタブと、１対のリードタブと別部材である１対の外部端子とを有する。そのため、１対のセル端子の設計自由度を向上できる。よって、金属ケース型二次セルは、充放電によって発生する熱をさらに逃がし易い構造にできる。その結果、組電池を大電流で充放電することによる温度上昇をより抑制することができる。 With this configuration, a pair of cell terminals has a pair of lead tabs, a pair of lead tabs, and a pair of external terminals that are separate members. Therefore, the degree of freedom in designing a pair of cell terminals can be improved. Therefore, the metal case type secondary cell can have a structure in which heat generated by charging and discharging is more easily released. As a result, temperature rise due to charging / discharging the assembled battery with a large current can be further suppressed.
　＜用語の定義＞
　一般的に、二次セルとは、正極と負極を１つずつしか備えておらず、充電と放電を繰り返すことができる電池のことである。 <Definition of terms>
Generally, a secondary cell is a battery that includes only one positive electrode and one negative electrode and can be repeatedly charged and discharged.
　本発明において、電極シートが平坦であるとは、電極シートが、単一の平面と平行な場合に限らない。電極シートが、単一の平面に沿って配置されていれば、一部または全体が緩やかに曲がっていてもよい。電極シートが１周以上巻かれている場合、電極シートは平坦ではない。巻かれた電極シートの全体の形状が直方体状の場合、たとえ直方体の厚みが薄くても、電極シートは平坦でない。 In the present invention, the fact that the electrode sheet is flat is not limited to the case where the electrode sheet is parallel to a single plane. If the electrode sheet is disposed along a single plane, a part or the whole of the electrode sheet may be gently bent. When the electrode sheet is wound more than once, the electrode sheet is not flat. When the entire shape of the wound electrode sheet is a rectangular parallelepiped, the electrode sheet is not flat even if the thickness of the rectangular parallelepiped is thin.
　本発明において、フラットボード形状とは、二次セルが１対の平坦な電極シートを有する場合の二次セルの形状である。巻かれた状態の１対の電極シートを有する二次セルは、ボックス型（角型ともいう）または円筒型である。 In the present invention, the flat board shape is the shape of the secondary cell when the secondary cell has a pair of flat electrode sheets. A secondary cell having a pair of wound electrode sheets is a box type (also called a square type) or a cylindrical type.
　本発明において、収容するとは、閉鎖空間に収容する場合に限らない。少なくとも一方向された空間に収容する場合を含む。つまり、ケースがある部品を収容する場合、ケースによってのみ形成される、部品を収容する空間は、閉鎖空間であってもなくてもよい。例えば、本発明における金属ケースは、１対の電極シートを収容するが、金属ケースは開口部を有する。 In the present invention, storing is not limited to storing in a closed space. It includes the case where it is accommodated in at least a unidirectional space. That is, when a part with a case is accommodated, the space for accommodating the part, which is formed only by the case, may or may not be a closed space. For example, the metal case in the present invention accommodates a pair of electrode sheets, but the metal case has an opening.
　本明細書において、ＡがＸ方向にＢと接触するとは、ＡとＢの接触する箇所同士がＸ方向に並んだ状態で接触することをいう。 In this specification, “A contacts with B in the X direction” means that the portions where A and B contact each other are in contact with each other in the X direction.
　本明細書において、ＡとＢがＸ方向に積層されるとは、ＡとＢがＸ方向に並んで配置されていることをいう。ＡとＢは接触していてもよく、接触していなくてもよい。ＡとＢの間に、別の部品が配置されていてもよい。 In this specification, “A and B are laminated in the X direction” means that A and B are arranged side by side in the X direction. A and B may be in contact or may not be in contact. Another part may be arranged between A and B.
　本明細書において、ある部品の端部とは、部品の端とその近傍部とを合わせた部分を意味する。 In this specification, the end portion of a part means a portion obtained by combining the end of the part and its vicinity.
　本明細書において、ＡとＢがＸ方向に並ぶとは、以下の状態を指す。Ｘ方向と直交するいずれの方向からＡとＢを見た場合であっても、Ｘ方向を示す任意の直線または曲線がＡとＢの両方を通る。また、Ａ全体がＢとＸ方向に並ぶとは、Ａ全体がＢとＸ方向に向かい合っていることを指す。つまり、Ｘ方向に見て、Ａ全体がＢと重なる状態を指す。全体を一部に言い換えてもよい。
　本明細書において、Ｙ方向から見てＡとＢがＸ方向に並ぶとは、以下の状態を指す。Ｙ方向からＡとＢを見たときに、Ｘ方向を示す任意の直線または曲線がＡとＢの両方を通る。Ｙ方向とは異なるＷ方向からＡとＢを見たとき、ＡとＢがＸ方向に並んでいなくてもよい。Ｙ方向から見て、Ａ全体がＢとＸ方向に並ぶとは、Ｙ方向から見て、Ａ全体がＢとＸ方向に向かい合っているように見えることをいう。全体を一部に言い換えてもよい。
　なお、上述の２つの定義において、ＡとＢは、接触していてもよい。また、ＡとＢは、離れていてもよい。ＡとＢの間に、Ｃが存在していてもよい。 In this specification, A and B being arranged in the X direction indicates the following state. Even when A and B are viewed from any direction orthogonal to the X direction, an arbitrary straight line or curve indicating the X direction passes through both A and B. Also, the fact that the whole A is aligned in the B and X directions means that the whole A faces the B and X directions. That is, the whole A overlaps with B when viewed in the X direction. You may paraphrase the whole in part.
In this specification, A and B being arranged in the X direction when viewed from the Y direction indicates the following state. When A and B are viewed from the Y direction, an arbitrary straight line or curve indicating the X direction passes through both A and B. When A and B are viewed from the W direction different from the Y direction, A and B may not be aligned in the X direction. When viewed from the Y direction, the entire A lined up in the B and X directions means that the entire A appears to face the B and X directions when viewed from the Y direction. You may paraphrase the whole in part.
In the above two definitions, A and B may be in contact with each other. A and B may be separated from each other. C may exist between A and B.
　本明細書において、Ａが、ＢとＣとの間に配置されるとは、特に限定しない限り、以下の状態を指す。任意の直線が、ＢとＡとＣをこの順で通る。つまり、ＢとＡとＣが、任意の直線の方向にこの順で並んでいる。 In this specification, A being arranged between B and C refers to the following states unless otherwise specified. An arbitrary straight line passes through B, A, and C in this order. That is, B, A, and C are arranged in this order in an arbitrary straight line direction.
　本発明において、含む（ｉｎｃｌｕｄｉｎｇ）、有する（ｃｏｍｐｒｉｓｉｎｇ）、備える（ｈａｖｉｎｇ）およびこれらの派生語は、列挙されたアイテム及びその等価物に加えて追加的アイテムをも包含することが意図されて用いられている。
　本発明において、取り付けられた（ｍｏｕｎｔｅｄ）、接続された（ｃｏｎｎｅｃｔｅｄ）、結合された（ｃｏｕｐｌｅｄ）、支持された（ｓｕｐｐｏｒｔｅｄ）という用語は、広義に用いられている。具体的には、直接的な取付、接続、結合、支持だけでなく、間接的な取付、接続、結合および支持も含む。さらに、接続された（ｃｏｎｎｅｃｔｅｄ）および結合された（ｃｏｕｐｌｅｄ）は、物理的又は機械的な接続／結合に限られない。それらは、直接的なまたは間接的な電気的接続／結合も含む。 In the present invention, including, comprising, having, and their derivatives are intended to include additional items in addition to the listed items and their equivalents. ing.
In the present invention, the terms mounted, connected, coupled, and supported are used in a broad sense. Specifically, it includes not only direct attachment, connection, coupling and support, but also indirect attachment, connection, coupling and support. Further, connected and coupled are not limited to physical or mechanical connections / couplings. They also include direct or indirect electrical connections / couplings.
　他に定義されない限り、本明細書で使用される全ての用語（技術用語および科学用語を含む）は、本発明が属する当業者によって一般的に理解されるのと同じ意味を有する。一般的に使用される辞書に定義された用語のような用語は、関連する技術および本開示の文脈における意味と一致する意味を有すると解釈されるべきであり、理想化されたまたは過度に形式的な意味で解釈されることはない。 Unless defined otherwise, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as having a meaning consistent with the meaning in the context of the related art and this disclosure, and are idealized or overly formal It is not interpreted in a sense.
　本明細書において、「好ましい」という用語は非排他的なものである。「好ましい」は、「好ましいがこれに限定されるものではない」ということを意味する。本明細書において、「好ましい」と記載された構成は、少なくとも、請求項１の構成により得られる上記効果を奏する。また、本明細書において、「してもよい」という用語は非排他的なものである。「してもよい」は、「してもよいがこれに限定されるものではない」という意味である。本明細書において、「してもよい」と記載された構成は、少なくとも、請求項１の構成により得られる上記効果を奏する。 In this specification, the term “preferred” is non-exclusive. “Preferred” means “preferably but not limited to”. In the present specification, the configuration described as “preferable” has at least the above-described effect obtained by the configuration of claim 1. Further, in this specification, the term “may” is non-exclusive. “May” means “may be, but is not limited to”. In the present specification, a configuration described as “may” at least exhibits the above-described effect obtained by the configuration of claim 1.
　本発明では、上述した好ましい構成を互いに組み合わせることを制限しない。本発明の実施形態を詳細に説明する前に、本発明は、以下の説明に記載されたまたは図面に図示された構成要素の構成および配置の詳細に制限されないことが理解されるべきである。本発明は、後述する実施形態以外の実施形態でも可能である。本発明は、後述する実施形態に様々な変更を加えた実施形態でも可能である。また、本発明は、後述する変更例を適宜組み合わせて実施することができる。 In the present invention, it is not limited to combine the above-described preferable configurations. Before describing in detail embodiments of the present invention, it is to be understood that the present invention is not limited to the details of the arrangement and arrangement of components set forth in the following description or illustrated in the drawings. The present invention is also possible in embodiments other than those described below. The present invention is also possible in embodiments in which various modifications are made to the embodiments described later. In addition, the present invention can be implemented by appropriately combining the modifications described later.
　本発明の複数の金属ケース型二次セルを備える組電池は、大電流で充放電することによる温度上昇を抑制できる。 The assembled battery including a plurality of metal case type secondary cells of the present invention can suppress temperature rise due to charging / discharging with a large current.
本発明の実施形態の組電池の模式的な断面図である。It is typical sectional drawing of the assembled battery of embodiment of this invention. 本発明の実施形態の具体例の組電池の斜視図である。It is a perspective view of the assembled battery of the specific example of embodiment of this invention. 図２に示す組電池が備える複数の金属ケース型二次セルの正面図である。It is a front view of the some metal case type | mold secondary cell with which the assembled battery shown in FIG. 2 is provided. 図２に示す組電池が備える複数の金属ケース型二次セルをＹ＋方向に見た側面図である。It is the side view which looked at the several metal case type | mold secondary cell with which the assembled battery shown in FIG. 2 is provided in the Y + direction. 図２に示す組電池が備える複数の金属ケース型二次セルをＹ－方向に見た側面図である。FIG. 3 is a side view of a plurality of metal case type secondary cells provided in the assembled battery shown in FIG. 2 when viewed in the Y-direction. 図２に示す組電池が備える複数の金属ケース型二次セルのうちの１つの斜視図である。FIG. 3 is a perspective view of one of a plurality of metal case type secondary cells provided in the assembled battery shown in FIG. 2. 図６に示す金属ケース型二次セルの分解斜視図である。FIG. 7 is an exploded perspective view of the metal case type secondary cell shown in FIG. 6. 図６に示す金属ケース型二次セルの平面図である。It is a top view of the metal case type secondary cell shown in FIG. 図６におけるＩＸ－ＩＸ断面図である。FIG. 7 is a sectional view taken along line IX-IX in FIG. 6. 図６に示す金属ケース型二次セルが有する金属ケース部品の斜視図である。It is a perspective view of the metal case component which the metal case type secondary cell shown in FIG. 6 has. 図６に示す金属ケース型二次セルを有する他の金属ケース部品の斜視図である。It is a perspective view of other metal case components which have a metal case type secondary cell shown in FIG. 図６に示す金属ケース型二次セルが有する絶縁キャップ本体の斜視図である。It is a perspective view of the insulation cap main body which the metal case type secondary cell shown in FIG. 6 has. 図１２に示す絶縁キャップ本体を、Ｘ＋方向に見た平面図である。It is the top view which looked at the insulation cap main body shown in FIG. 12 in the X + direction. 図６に示す金属ケース型二次セルが有する絶縁カバーの斜視図である。It is a perspective view of the insulating cover which the metal case type secondary cell shown in FIG. 6 has. 図６に示す金属ケース型二次セルが有する外部端子の斜視図である。It is a perspective view of the external terminal which the metal case type secondary cell shown in FIG. 6 has. 隣り合う２つの金属ケース型二次セルの絶縁キャップ部同士の接触部分の断面図である。It is sectional drawing of the contact part of the insulation cap parts of two adjacent metal case type secondary cells. 本発明の実施形態の変更例の組電池が備える複数の金属ケース型二次セルの側面図である。It is a side view of the some metal case type secondary cell with which the assembled battery of the example of a change of embodiment of this invention is provided.
　＜本発明の実施形態＞
　以下、図１を参照しながら、本発明の実施形態の組電池１０について説明する。組電池１０は、複数の金属ケース型二次セル１４を備える。複数の金属ケース型二次セル１４の各々は、１対の電極シート１４６、１４７と、金属製の金属ケース１４１と、内側ケース１４２と、絶縁キャップ部１４３と、１対のセル端子１４４、１４５とを有する。 <Embodiment of the present invention>
Hereinafter, an assembled battery 10 according to an embodiment of the present invention will be described with reference to FIG. The assembled battery 10 includes a plurality of metal case type secondary cells 14. Each of the plurality of metal case type secondary cells 14 includes a pair of electrode sheets 146 and 147, a metal case 141 made of metal, an inner case 142, an insulating cap portion 143, and a pair of cell terminals 144 and 145. And have.
　１対の電極シート１４６、１４７は、１枚の負極シート１４６と１枚の正極シート１４７で構成される。金属ケース１４１は、１対の電極シート１４６、１４７を収容する。絶縁キャップ部１４３は、絶縁材料で形成され、金属ケース１４１の開口部に設置される。１対のセル端子１４４、１４５は、１対の電極シート１４６、１４７に電気的に接続される。１対のセル端子１４４、１４５は、それぞれの一部が絶縁キャップ部１４３に設置される。それにより、１対のセル端子１４４、１４５は、金属ケース１４１に電気的に絶縁される。１対のセル端子１４４、１４５は、金属ケース１４１の外部に露出する１対の接続面１４４ａ、１４５ａを有する。複数の金属ケース型二次セル１４の各々が有する１対の接続面１４４ａ、１４５ａを用いて、複数の金属ケース型二次セル１４は直列または並列に接続される。なお、図１は、複数の金属ケース型二次セル１４を直列に接続する場合を表示している。 The pair of electrode sheets 146 and 147 includes one negative electrode sheet 146 and one positive electrode sheet 147. The metal case 141 accommodates a pair of electrode sheets 146 and 147. The insulating cap part 143 is formed of an insulating material and is installed in the opening of the metal case 141. The pair of cell terminals 144 and 145 are electrically connected to the pair of electrode sheets 146 and 147. A part of each of the pair of cell terminals 144 and 145 is installed in the insulating cap part 143. Thereby, the pair of cell terminals 144 and 145 are electrically insulated from the metal case 141. The pair of cell terminals 144 and 145 have a pair of connection surfaces 144a and 145a exposed to the outside of the metal case 141. The plurality of metal case type secondary cells 14 are connected in series or in parallel using a pair of connection surfaces 144a and 145a which each of the plurality of metal case type secondary cells 14 has. FIG. 1 shows a case where a plurality of metal case type secondary cells 14 are connected in series.
　内側ケース１４２は、金属ケース１４１の内側に配置される。内側ケース１４２は、可撓性を有する合成樹脂製のフィルムで形成される。内側ケース１４２は、平坦な状態で積層された１対の電極シート１４６、１４７を収容する。内側ケース１４２に、１対の平坦な電極シート１４６、１４７と接触するように電解質が封入される。内側ケース１４２は、１対の平坦な電極シート１４６、１４７の積層方向において金属ケース１４１の第１の内面１４１ａと面接触する。 The inner case 142 is disposed inside the metal case 141. The inner case 142 is formed of a flexible synthetic resin film. The inner case 142 accommodates a pair of electrode sheets 146 and 147 that are laminated in a flat state. An electrolyte is sealed in the inner case 142 so as to contact the pair of flat electrode sheets 146 and 147. The inner case 142 is in surface contact with the first inner surface 141a of the metal case 141 in the stacking direction of the pair of flat electrode sheets 146, 147.
　１対の電極シート１４６、１４７は、平坦な状態で積層されている。そのため、複数の金属ケース型二次セル１４の各々は、１対の平坦な電極シート１４６、１４７の積層方向における長さが、１対の平坦な電極シート１４６、１４７の積層方向に垂直な方向における最小長さよりも小さいフラットボード形状である。複数の金属ケース型二次セル１４は、１対の平坦な電極シート１４６、１４７の積層方向に積層されている。そのため、金属ケース型二次セル１４の形状が、フラットボード形状であるものの、組電池１０の形状は、巻かれた状態の正極シートおよび負極シートを備える組電池と同様に、箱型にすることができる。 The pair of electrode sheets 146 and 147 are laminated in a flat state. Therefore, each of the plurality of metal case-type secondary cells 14 has a length in the stacking direction of the pair of flat electrode sheets 146 and 147 that is perpendicular to the stacking direction of the pair of flat electrode sheets 146 and 147. It is a flat board shape smaller than the minimum length in. The plurality of metal case type secondary cells 14 are stacked in the stacking direction of a pair of flat electrode sheets 146 and 147. Therefore, although the shape of the metal case type secondary cell 14 is a flat board shape, the shape of the assembled battery 10 is a box shape as in the assembled battery including the positive electrode sheet and the negative electrode sheet in a wound state. Can do.
　負極シート１４６および正極シート１４７は、平坦な状態で積層される。そのため、１対の平坦な電極シート１４６、１４７は、金属ケース１４１の内面とほぼ平行に配置される。つまり、平坦な負極シート１４６は、金属ケース１４１の内面までの最短距離がほぼ一定になる。平坦な正極シート１４７は、金属ケース１４１の内面までの最短距離がほぼ一定になる。そのため、１対の電極シート１４６、１４７が巻かれた状態で配置される場合に比べて、１対の電極シート１４６、１４７の放熱性を均一化できる。よって、組電池１０を大電流で充放電したときに金属ケース型二次セル１４が放熱しやすい。 The negative electrode sheet 146 and the positive electrode sheet 147 are laminated in a flat state. Therefore, the pair of flat electrode sheets 146 and 147 are disposed substantially parallel to the inner surface of the metal case 141. That is, the flat negative electrode sheet 146 has a substantially constant shortest distance to the inner surface of the metal case 141. The flat positive electrode sheet 147 has a substantially constant shortest distance to the inner surface of the metal case 141. Therefore, the heat dissipation of the pair of electrode sheets 146 and 147 can be made uniform as compared with the case where the pair of electrode sheets 146 and 147 are arranged in a wound state. Therefore, when the assembled battery 10 is charged / discharged with a large current, the metal case-type secondary cell 14 easily radiates heat.
　しかし、金属ケース１４１は、１対の電極シート１４６、１４７を平坦な状態で収容する形状であるため、金属ケース１４１によって、液体の電解質を封入するのに必要な密封性を確保することは難しい。そこで、１対の電極シート１４６、１４７は、金属シートの内側に配置された内側シートに収容される。この内側ケース１４２に、電解質が１対の電極シート１４６、１４７と接触するように封入される。内側ケース１４２は、可撓性を有する合成樹脂製のフィルムで形成される。そのため、内側ケース１４２は、平坦な状態で積層された１対の電極シート１４６、１４７を収容するにも関わらず、液体の電解質を封入するのに必要な密封性を確保しやすい。したがって、内側ケース１４２によって金属ケース型二次セル１４の密封性を確保しつつ、金属ケース１４１によって金属ケース型二次セル１４の放熱性を確保できる。さらに、内側ケース１４２は、１対の平坦な電極シート１４６、１４７の積層方向において金属ケース１４１の第１の内面１４１ａと面接触する。そのため、金属ケース型二次セル１４が充放電したときに発生する熱を、金属ケース１４１の第１の内面１４１ａから逃がすことができる。その結果、複数の金属ケース型二次セル１４の各々において、組電池１０を大電流で充放電することによる温度上昇を抑制することができる。 However, since the metal case 141 has a shape that accommodates the pair of electrode sheets 146 and 147 in a flat state, it is difficult to ensure the sealing performance necessary for enclosing the liquid electrolyte by the metal case 141. . Therefore, the pair of electrode sheets 146 and 147 are accommodated in the inner sheet disposed inside the metal sheet. The inner case 142 is sealed so that the electrolyte contacts the pair of electrode sheets 146 and 147. The inner case 142 is formed of a flexible synthetic resin film. Therefore, the inner case 142 is easy to ensure the sealing performance necessary to enclose the liquid electrolyte in spite of accommodating the pair of electrode sheets 146 and 147 laminated in a flat state. Therefore, the heat dissipation of the metal case type secondary cell 14 can be secured by the metal case 141 while the inner case 142 ensures the sealing property of the metal case type secondary cell 14. Further, the inner case 142 is in surface contact with the first inner surface 141a of the metal case 141 in the stacking direction of the pair of flat electrode sheets 146 and 147. Therefore, the heat generated when the metal case type secondary cell 14 is charged / discharged can be released from the first inner surface 141a of the metal case 141. As a result, in each of the plurality of metal case type secondary cells 14, it is possible to suppress an increase in temperature caused by charging / discharging the assembled battery 10 with a large current.
　＜本発明の実施形態の具体例＞
　次に、図２～図１６を参照しながら、本発明の実施形態の具体例の組電池について説明する。基本的に、本発明の実施形態の具体例は、上述した本発明の実施形態の特徴を全て有している。上述した本発明の実施形態と同じ部位についての説明は省略する。以下、上述した本発明の実施形態と異なる構成について説明する。以下の説明には、図２等に示すＸ＋方向、Ｘ－方向、Ｙ＋方向、Ｙ－方向、Ｚ＋方向、Ｚ－方向を使用する。以下の説明において、Ｘ＋方向とＸ－方向の両方を含む方向を、Ｘ方向という。同様に、Ｙ＋方向とＹ－方向の両方を含む方向を、Ｙ方向という。Ｚ＋方向とＺ－方向の両方を含む方向を、Ｚ方向という。Ｘ方向は、Ｙ方向とＺ方向に垂直な方向であり、Ｙ方向は、Ｚ方向に垂直な方向である。図３等に示す、丸の中に小さい黒丸が表示された記号は、紙面の奥から手前に向かう方向を示している。 <Specific Examples of Embodiments of the Present Invention>
Next, a specific example of the assembled battery according to the embodiment of the present invention will be described with reference to FIGS. Basically, specific examples of embodiments of the present invention have all the features of the embodiments of the present invention described above. A description of the same parts as those of the above-described embodiment of the present invention will be omitted. Hereinafter, a configuration different from the above-described embodiment of the present invention will be described. In the following description, the X + direction, the X− direction, the Y + direction, the Y− direction, the Z + direction, and the Z− direction shown in FIG. In the following description, a direction including both the X + direction and the X− direction is referred to as an X direction. Similarly, a direction including both the Y + direction and the Y− direction is referred to as a Y direction. A direction including both the Z + direction and the Z− direction is referred to as a Z direction. The X direction is a direction perpendicular to the Y direction and the Z direction, and the Y direction is a direction perpendicular to the Z direction. A symbol with a small black circle displayed in a circle shown in FIG. 3 or the like indicates a direction from the back to the front of the page.
　（１）組電池１０の全体構成
　図２に示すように、組電池１０は、ハウジング１１を有する。ハウジング１１は、略直方体の箱形状である。ハウジング１１は、絶縁材料で形成されている。絶縁材料は、例えば、合成樹脂である。ハウジング１１は、その外面に１対の組電池端子１２、１３を有する。組電池１０は、１対の組電池端子１２、１３を介して、電力供給装置（図示せず）に接続される。電力供給装置は、組電池１０に電力を供給する。組電池１０は、１対の組電池端子１２、１３を介して、電力を消費する電力消費装置（図示せず）に接続される。組電池１０は、電力消費装置に電力を供給する。電力消費装置は、具体的には特に限定されない。 (1) Overall Configuration of the Assembly Battery 10 As shown in FIG. 2, the assembly battery 10 includes a housing 11. The housing 11 has a substantially rectangular parallelepiped box shape. The housing 11 is made of an insulating material. The insulating material is, for example, a synthetic resin. The housing 11 has a pair of assembled battery terminals 12 and 13 on its outer surface. The assembled battery 10 is connected to a power supply device (not shown) via a pair of assembled battery terminals 12 and 13. The power supply device supplies power to the assembled battery 10. The assembled battery 10 is connected to a power consuming device (not shown) that consumes power via a pair of assembled battery terminals 12 and 13. The assembled battery 10 supplies power to the power consuming device. The power consumption device is not specifically limited.
　図２では、Ｘ＋方向が紙面上方向となっている。しかし、組電池１０の使用時の向きは、図２の紙面上方向が上方向となる向きに限定されない。組電池１０は、図２の紙面上方向が下方向となるように使用されてもよい。組電池１０は、図２の紙面上方向が水平方向となるように使用されてもよい。組電池１０は、図２の紙面上方向がそれ以外の方向となるように使用されてもよい。 In FIG. 2, the X + direction is the upward direction on the page. However, the direction when the assembled battery 10 is used is not limited to the direction in which the upward direction in the drawing of FIG. The assembled battery 10 may be used so that the upper direction in FIG. 2 is the lower direction. The assembled battery 10 may be used so that the upper direction in FIG. 2 is the horizontal direction. The assembled battery 10 may be used so that the upward direction in FIG. 2 is the other direction.
　ハウジング１１は、図３、図４および図５に示す複数の金属ケース型二次セル１４を収容する。複数の金属ケース型二次セル１４は、Ｘ方向に積層された状態で、ハウジング１１に収容されている。金属ケース型二次セル１４は、例えば、リチウムイオン電池（リチウムイオンセル）である。金属ケース型二次セル１４の種類は、これに限らない。ハウジング１１は、複数の金属ケース型二次セル１４に加えて、複数の金属ケース型二次セル１４を管理する電池管理装置（ＢＭＳ：Battery Management System）等を収容する。電池管理装置は、複数の金属ケース型二次セル１４のＸ＋方向側に配置されている。 The housing 11 accommodates a plurality of metal case type secondary cells 14 shown in FIGS. 3, 4 and 5. The plurality of metal case type secondary cells 14 are accommodated in the housing 11 in a state of being stacked in the X direction. The metal case type secondary cell 14 is, for example, a lithium ion battery (lithium ion cell). The type of the metal case type secondary cell 14 is not limited to this. In addition to the plurality of metal case type secondary cells 14, the housing 11 houses a battery management device (BMS: Battery Management System) that manages the plurality of metal case type secondary cells 14. The battery management device is disposed on the X + direction side of the plurality of metal case type secondary cells 14.
　図２に示すように、複数の金属ケース型二次セル１４を収容するハウジング１１は、Ｚ方向の両面に、複数の通気孔１１ａを有する。そのため、金属ケース型二次セル１４の充放電によって発生する熱をハウジング１１の外部に逃がし易い。 As shown in FIG. 2, the housing 11 that accommodates the plurality of metal case-type secondary cells 14 has a plurality of vent holes 11a on both sides in the Z direction. Therefore, the heat generated by charging / discharging of the metal case type secondary cell 14 is easily released to the outside of the housing 11.
　図３、図４および図５に示すように、複数の金属ケース型二次セル１４は、互いに同じ形状および大きさを有する。複数の金属ケース型二次セル１４は、互いに同じ内部構造を有する。但し、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の向きは、Ｘ方向の軸回りに１８０°異なる。 As shown in FIG. 3, FIG. 4, and FIG. 5, the plurality of metal case type secondary cells 14 have the same shape and size. The plurality of metal case type secondary cells 14 have the same internal structure. However, the directions of the two metal case-type secondary cells 14 adjacent in the X direction differ by 180 ° around the axis in the X direction.
　（２）金属ケース型二次セル１４の全体構成
　以下、複数の金属ケース型二次セル１４のうち、Ｘ＋方向の端に配置された金属ケース型二次セル１４について、図６～図１５を参照しつつ説明する。この金属ケース型二次セル１４とＸ方向の軸回りに１８０°異なる向きに配置された金属ケース型二次セル１４についての説明は省略する。 (2) Overall Configuration of Metal Case Secondary Cell 14 Hereinafter, the metal case secondary cell 14 arranged at the end in the X + direction among the plurality of metal case secondary cells 14 will be described with reference to FIGS. This will be described with reference to FIG. A description of the metal case type secondary cell 14 and the metal case type secondary cell 14 arranged in a direction different by 180 ° around the axis in the X direction will be omitted.
　図６に示すように、金属ケース型二次セル１４は、全体として、矩形の平坦な板形状（フラットボード形状）である。金属ケース型二次セル１４のＹ方向の長さは、金属ケース型二次セル１４のＺ方向の長さよりも大きい。金属ケース型二次セル１４のＸ方向の長さは、金属ケース型二次セル１４のＺ方向の長さよりも小さい。金属ケース型二次セル１４の厚み方向は、Ｘ方向である。 As shown in FIG. 6, the metal case type secondary cell 14 has a rectangular flat plate shape (flat board shape) as a whole. The length of the metal case type secondary cell 14 in the Y direction is larger than the length of the metal case type secondary cell 14 in the Z direction. The length of the metal case type secondary cell 14 in the X direction is smaller than the length of the metal case type secondary cell 14 in the Z direction. The thickness direction of the metal case type secondary cell 14 is the X direction.
　図７、図８および図９に示すように、金属ケース型二次セル１４は、金属ケース１４１と、内側ケース１４２と、絶縁キャップ部１４３と、１対の電極シート１４６、１４７（図８および図９参照）と、１対のセル端子１４４、１４５とを有する。絶縁キャップ部１４３は、１対の絶縁キャップ１４３Ａ、１４３Ｂを有する。セル端子１４４は、リードタブ１４４１と、外部端子１４４２とを有する。セル端子１４５は、リードタブ１４５１と、外部端子１４５２とを有する。なお、図８の紙面の下側半分は、金属ケース部品１４１２と、絶縁キャップ部１４３の半分と、１対の外部端子１４４２、１４５２の半分の表示を省略している。 As shown in FIGS. 7, 8, and 9, the metal case type secondary cell 14 includes a metal case 141, an inner case 142, an insulating cap portion 143, and a pair of electrode sheets 146, 147 (FIGS. 8 and 9). 9) and a pair of cell terminals 144 and 145. The insulating cap part 143 has a pair of insulating caps 143A and 143B. The cell terminal 144 includes a lead tab 1441 and an external terminal 1442. The cell terminal 145 has a lead tab 1451 and an external terminal 1452. In the lower half of the paper surface of FIG. 8, the display of the metal case component 1412, the half of the insulating cap 143, and the half of the pair of external terminals 1442 and 1452 is omitted.
　（３）金属ケース１４１の構成
　図６に示すように、金属ケース１４１は、金属ケース型二次セル１４の外形の大部分を構成する。金属ケース１４１は、Ｙ方向の両端部に開口部を有する。金属ケース１４１は、矩形の筒状である。金属ケース１４１のＹ方向の長さは、金属ケース１４１のＺ方向の長さよりも大きい。金属ケース１４１のＸ方向の長さ（厚み）は、金属ケース１４１のＺ方向の長さよりも小さい。金属ケース１４１は、Ｙ方向に垂直な平面に対して面対称性を有する。つまり、金属ケース１４１のＹ＋方向の端部は、Ｙ方向に垂直な平面に対して、金属ケース１４１のＹ－方向の端部と面対称である。また、金属ケース１４１は、Ｚ方向に垂直な平面に対して面対称性を有する。金属ケース１４１は、金属材料で形成されている。金属材料は、特に限定されない。金属材料は、例えば、アルミニウム合金である。 (3) Configuration of Metal Case 141 As shown in FIG. 6, the metal case 141 constitutes most of the outer shape of the metal case type secondary cell 14. The metal case 141 has openings at both ends in the Y direction. The metal case 141 has a rectangular cylindrical shape. The length of the metal case 141 in the Y direction is larger than the length of the metal case 141 in the Z direction. The length (thickness) of the metal case 141 in the X direction is smaller than the length of the metal case 141 in the Z direction. The metal case 141 has plane symmetry with respect to a plane perpendicular to the Y direction. That is, the end of the metal case 141 in the Y + direction is plane-symmetric with the end of the metal case 141 in the Y− direction with respect to a plane perpendicular to the Y direction. Further, the metal case 141 has plane symmetry with respect to a plane perpendicular to the Z direction. The metal case 141 is made of a metal material. The metal material is not particularly limited. The metal material is, for example, an aluminum alloy.
　図７および図９に示すように、金属ケース１４１は、金属ケース部品１４１１と、金属ケース部品１４１２とを有する。金属ケース部品１４１２は、金属ケース部品１４１１とＸ方向に積層されるように、金属ケース部品１４１１に取り付けられる。 7 and 9, the metal case 141 has a metal case component 1411 and a metal case component 1412. The metal case component 1412 is attached to the metal case component 1411 so as to be laminated with the metal case component 1411 in the X direction.
　図１０に示すように、金属ケース部品１４１１は、主板部１４１１１と、１対の側板部１４１１２、１４１１２とを有する。金属ケース部品１４１１は、１つの部品で構成される。つまり、主板部１４１１１と、１対の側板部１４１１２、１４１１２は、一体的に形成されている。 As shown in FIG. 10, the metal case component 1411 includes a main plate portion 14111 and a pair of side plate portions 14112 and 14112. The metal case part 1411 is composed of one part. That is, the main plate portion 14111 and the pair of side plate portions 14112 and 14112 are integrally formed.
　主板部１４１１１は、矩形の平坦な板形状である。主板部１４１１１は、Ｘ方向に垂直な方向に沿って配置されている。主板部１４１１１の厚み方向は、Ｘ方向である。つまり、主板部１４１１１のＸ方向の長さ（厚み）は、主板部１４１１１のＹ方向の長さおよびＺ方向の長さよりも小さい。主板部１４１１１のＸ方向の長さ（厚み）は、主板部１４１１１のＹ方向の長さおよびＺ方向の長さよりも小さい。主板部１４１１１は、Ｘ＋方向を向いた面１４１１１ａを有する。面１４１１１ａは、Ｘ方向に垂直である。面１４１１１ａは、金属ケース１４１の内面の一部を構成する。以下、面１４１１１ａを、内面１４１１１ａという。内面１４１１１ａは、本発明の実施形態の第１の内面１４１ａの一例である。 The main plate portion 14111 has a rectangular flat plate shape. The main plate portion 14111 is disposed along a direction perpendicular to the X direction. The thickness direction of the main plate portion 14111 is the X direction. That is, the length (thickness) of the main plate portion 14111 in the X direction is smaller than the length of the main plate portion 14111 in the Y direction and the length in the Z direction. The length (thickness) in the X direction of the main plate portion 14111 is smaller than the length in the Y direction and the length in the Z direction of the main plate portion 14111. The main plate portion 14111 has a surface 14111a facing the X + direction. The surface 14111a is perpendicular to the X direction. The surface 14111a constitutes a part of the inner surface of the metal case 141. Hereinafter, the surface 14111a is referred to as an inner surface 14111a. The inner surface 14111a is an example of the first inner surface 141a according to the embodiment of the present invention.
　１対の側板部１４１１２、１４１１２は、主板部１４１１１のＺ方向の両端に接続されている。つまり、一方の側板部１４１１２と他方の側板部１４１１２は、Ｚ方向に離れている。１対の側板部１４１１２、１４１１２は、主板部１４１１１からＸ＋方向に突出している。各側板部１４１１２は、Ｙ方向に長い矩形の平坦な板形状である。各側板部１４１１２は、Ｚ方向に垂直な方向に沿って配置されている。各側板部１４１１２の厚み方向は、Ｚ方向である。つまり、各側板部１４１１２のＺ方向の長さ（厚み）は、側板部１４１１２のＸ方向の長さおよびＹ方向の長さよりも小さい。１対の側板部１４１１２、１４１１２は、互いに平行に配置されている。 The pair of side plate portions 14112 and 14112 are connected to both ends of the main plate portion 14111 in the Z direction. That is, one side plate portion 14112 and the other side plate portion 14112 are separated in the Z direction. The pair of side plate portions 14112 and 14112 protrudes from the main plate portion 14111 in the X + direction. Each side plate portion 14112 has a rectangular flat plate shape that is long in the Y direction. Each side plate portion 14112 is disposed along a direction perpendicular to the Z direction. The thickness direction of each side plate portion 14112 is the Z direction. That is, the length (thickness) in the Z direction of each side plate portion 14112 is smaller than the length in the X direction and the length in the Y direction of the side plate portion 14112. The pair of side plate portions 14112 and 14112 are arranged in parallel to each other.
　図１１に示すように、金属ケース部品１４１２は、主板部１４１２１と、１対の側板部１４１２２、１４１２２とを有する。金属ケース部品１４１２は、１つの部品で構成される。つまり、主板部１４１２１と、１対の側板部１４１２２、１４１２２は、一体的に形成されている。 As shown in FIG. 11, the metal case component 1412 includes a main plate portion 14121 and a pair of side plate portions 14122 and 14122. The metal case part 1412 is composed of one part. That is, the main plate portion 14121 and the pair of side plate portions 14122 and 14122 are integrally formed.
　主板部１４１２１は、全体として矩形の平坦な板形状である。主板部１４１２１は、Ｘ方向に垂直な方向に沿って配置されている。主板部１４１２１の厚み方向は、Ｘ方向である。つまり、主板部１４１２１のＸ方向の長さ（厚み）は、主板部１４１２１のＹ方向の長さおよびＺ方向の長さよりも小さい。図９に示すように、主板部１４１２１は、Ｘ－方向を向いた面１４１２１ａを有する。面１４１２１ａは、Ｘ方向に垂直である。面１４１２１ａは、金属ケース１４１の内面の一部を構成する。以下、面１４１２１ａを、内面１４１２１ａという。内面１４１２１ａは、主板部１４１１１の内面１４１１１ａとＸ方向に向かい合う。内面１４１２１ａは、本発明の第２の内面に相当する。 The main plate portion 14121 has a rectangular flat plate shape as a whole. The main plate portion 14121 is disposed along a direction perpendicular to the X direction. The thickness direction of the main plate portion 14121 is the X direction. That is, the length (thickness) of the main plate portion 14121 in the X direction is smaller than the length of the main plate portion 14121 in the Y direction and the length in the Z direction. As shown in FIG. 9, the main plate portion 14121 has a surface 14121a facing the X-direction. The surface 14121a is perpendicular to the X direction. The surface 14121a constitutes a part of the inner surface of the metal case 141. Hereinafter, the surface 14121a is referred to as an inner surface 14121a. The inner surface 14121a faces the inner surface 14111a of the main plate portion 14111 in the X direction. The inner surface 14121a corresponds to the second inner surface of the present invention.
　図１１に示すように、主板部１４１２１は、Ｙ方向の両端部に、切欠１４１２１ｂを有する。各切欠１４１２１ｂは、矩形状である。各切欠１４１２１ｂは、主板部１４１２１のＸ方向の中央部に形成されている。 As shown in FIG. 11, the main plate portion 14121 has notches 14121b at both ends in the Y direction. Each notch 14121b has a rectangular shape. Each notch 14121b is formed at the center of the main plate portion 14121 in the X direction.
　１対の側板部１４１２２、１４１２２は、主板部１４１２１のＺ方向の両端に接続されている。つまり、一方の側板部１４１２２と他方の側板部１４１２２は、Ｚ方向に離れている。１対の側板部１４１２２、１４１２２は、主板部１４１２１からＸ－方向に突出している。言い換えると、１対の側板部１４１２２、１４１２２は、金属ケース部品１４１１の主板部１４１１１に向かって突出している（図７参照）。各側板部１４１２２は、Ｚ方向に細長い矩形の板形状である。各側板部１４１２２は、Ｚ方向に垂直な方向に沿って配置されている。各側板部１４１２２の厚み方向は、Ｚ方向である。つまり、各側板部１４１２２のＺ方向の長さ（厚み）は、側板部１４１２２のＸ方向の長さおよびＹ方向の長さよりも小さい。１対の側板部１４１２２、１４１２２は、互いに平行に配置されている。各側板部１４１２２のＸ方向の長さは、金属ケース部品１４１１の各側板部１４１１２のＸ方向の長さよりも小さい。 The pair of side plate portions 14122 and 14122 are connected to both ends of the main plate portion 14121 in the Z direction. That is, one side plate portion 14122 and the other side plate portion 14122 are separated in the Z direction. The pair of side plate portions 14122 and 14122 protrudes from the main plate portion 14121 in the X-direction. In other words, the pair of side plate portions 14122 and 14122 protrudes toward the main plate portion 14111 of the metal case component 1411 (see FIG. 7). Each side plate portion 14122 has a rectangular plate shape elongated in the Z direction. Each side plate portion 14122 is arranged along a direction perpendicular to the Z direction. The thickness direction of each side plate portion 14122 is the Z direction. That is, the length (thickness) in the Z direction of each side plate portion 14122 is smaller than the length in the X direction and the length in the Y direction of the side plate portion 14122. The pair of side plate portions 14122 and 14122 are arranged in parallel to each other. The length in the X direction of each side plate portion 14122 is smaller than the length in the X direction of each side plate portion 14112 of the metal case component 1411.
　図６に示すように、金属ケース部品１４１２の一方の側板部１４１２２は、金属ケース部品１４１１の一方の側板部１４１１２の一部とＺ方向に積層される。金属ケース部品１４１２の他方の側板部１４１２２は、金属ケース部品１４１１の他方の側板部１４１１２の一部とＺ方向に積層される。１対の側板部１４１２２、１４１２２は、１対の側板部１４１１２、１４１１２の外側に配置される。 As shown in FIG. 6, one side plate portion 14122 of the metal case component 1412 is laminated with a part of one side plate portion 14112 of the metal case component 1411 in the Z direction. The other side plate portion 14122 of the metal case component 1412 is laminated with a part of the other side plate portion 14112 of the metal case component 1411 in the Z direction. The pair of side plate portions 14122 and 14122 are disposed outside the pair of side plate portions 14112 and 14112.
　（４）１対の絶縁キャップ１４３Ａ、１４３Ｂの構成
　図６および図７に示すように、１対の絶縁キャップ１４３Ａ、１４３Ｂは、金属ケース１４１のＹ方向の両端の開口部に設置される。絶縁キャップ１４３Ａと絶縁キャップ１４３Ｂは、互いに同じ形状および大きさを有する。絶縁キャップ１４３Ａは、Ｙ方向に垂直な面に対して絶縁キャップ１４３Ｂと面対称である。絶縁キャップ１４３Ａおよび絶縁キャップ１４３Ｂは、それぞれ、Ｚ方向に垂直な面に対して面対称性を有する。絶縁キャップ１４３ＡのＺ方向の最大長さは、絶縁キャップ１４３ＡのＹ方向の最大長さよりも大きい。絶縁キャップ１４３ＡのＸ方向の最大長さは、絶縁キャップ１４３ＡのＹ方向の最大長さよりも小さい。絶縁キャップ１４３ＡのＺ方向の最大長さは、金属ケース１４１のＺ方向の長さとほぼ同じである。絶縁キャップ１４３ＡのＸ方向の最大長さは、金属ケース１４１のＸ方向の長さ（厚み）とほぼ同じである。絶縁キャップ１４３ＡのＹ方向の長さは、金属ケース１４１のＹ方向の長さよりも大幅に小さい。 (4) Configuration of a pair of insulating caps 143A and 143B As shown in FIGS. 6 and 7, the pair of insulating caps 143A and 143B are installed at openings at both ends of the metal case 141 in the Y direction. The insulating cap 143A and the insulating cap 143B have the same shape and size. The insulating cap 143A is plane-symmetric with the insulating cap 143B with respect to a plane perpendicular to the Y direction. The insulating cap 143A and the insulating cap 143B each have a plane symmetry with respect to a plane perpendicular to the Z direction. The maximum length of the insulating cap 143A in the Z direction is larger than the maximum length of the insulating cap 143A in the Y direction. The maximum length of the insulating cap 143A in the X direction is smaller than the maximum length of the insulating cap 143A in the Y direction. The maximum length of the insulating cap 143A in the Z direction is substantially the same as the length of the metal case 141 in the Z direction. The maximum length of the insulating cap 143 </ b> A in the X direction is substantially the same as the length (thickness) of the metal case 141 in the X direction. The length of the insulating cap 143 </ b> A in the Y direction is significantly smaller than the length of the metal case 141 in the Y direction.
　絶縁キャップ１４３Ａは、絶縁キャップ本体１４３１Ａと、絶縁カバー１４３２Ａとを有する。絶縁キャップ１４３Ｂは、絶縁キャップ本体１４３１Ｂと、絶縁カバー１４３２Ｂとを有する。絶縁キャップ本体１４３１Ａ、絶縁キャップ本体１４３１Ｂ、絶縁カバー１４３２Ａ、および絶縁カバー１４３２Ｂは、絶縁材料で形成されている。絶縁材料は、例えば、合成樹脂である。絶縁キャップ本体１４３１Ａと絶縁キャップ本体１４３１Ｂは、同じ絶縁材料で形成されている。絶縁カバー１４３２Ａと絶縁カバー１４３２Ｂは、同じ絶縁材料で形成されている。絶縁キャップ本体１４３１Ａおよび絶縁キャップ本体１４３１Ｂを形成する絶縁材料は、絶縁カバー１４３２Ａおよび絶縁カバー１４３２Ｂを形成する絶縁材料と同じであっても異なっていてもよい。 The insulating cap 143A has an insulating cap body 1431A and an insulating cover 1432A. The insulating cap 143B includes an insulating cap main body 1431B and an insulating cover 1432B. The insulating cap body 1431A, the insulating cap body 1431B, the insulating cover 1432A, and the insulating cover 1432B are made of an insulating material. The insulating material is, for example, a synthetic resin. The insulating cap body 1431A and the insulating cap body 1431B are formed of the same insulating material. The insulating cover 1432A and the insulating cover 1432B are formed of the same insulating material. The insulating material forming the insulating cap main body 1431A and the insulating cap main body 1431B may be the same as or different from the insulating material forming the insulating cover 1432A and the insulating cover 1432B.
　（４－１）絶縁キャップ本体１４３１Ａおよび絶縁キャップ本体１４３１Ｂの構成
　絶縁キャップ本体１４３１Ａと絶縁キャップ本体１４３１Ｂは、互いに同じ形状および大きさを有する。以下、絶縁キャップ本体１４３１Ａについて説明し、絶縁キャップ本体１４３１Ｂについての説明は省略する。 (4-1) Configuration of Insulating Cap Body 1431A and Insulating Cap Body 1431B The insulating cap body 1431A and the insulating cap body 1431B have the same shape and size. Hereinafter, the insulating cap body 1431A will be described, and the description of the insulating cap body 1431B will be omitted.
　図１２に示すように、絶縁キャップ本体１４３１ＡのＺ方向の最大長さは、絶縁キャップ本体１４３１ＡのＹ方向の最大長さよりも大きい。絶縁キャップ本体１４３１ＡのＸ方向の最大長さは、絶縁キャップ本体１４３１ＡのＹ方向の最大長さよりも小さい。図６および図７に示すように、絶縁キャップ本体１４３１ＡのＺ方向の最大長さは、金属ケース１４１のＺ方向の長さとほぼ同じである。絶縁キャップ本体１４３１ＡのＸ方向の最大長さは、金属ケース１４１のＸ方向の長さ（厚み）とほぼ同じである。絶縁キャップ１４３ＡのＹ方向の長さは、金属ケース１４１のＹ方向の長さよりも大幅に小さい。 As shown in FIG. 12, the maximum length in the Z direction of the insulating cap body 1431A is larger than the maximum length in the Y direction of the insulating cap body 1431A. The maximum length in the X direction of the insulating cap body 1431A is smaller than the maximum length in the Y direction of the insulating cap body 1431A. As shown in FIGS. 6 and 7, the maximum length in the Z direction of the insulating cap body 1431 </ b> A is substantially the same as the length of the metal case 141 in the Z direction. The maximum length in the X direction of the insulating cap main body 1431A is substantially the same as the length (thickness) of the metal case 141 in the X direction. The length of the insulating cap 143 </ b> A in the Y direction is significantly smaller than the length of the metal case 141 in the Y direction.
　図１２に示すように、絶縁キャップ本体１４３１Ａは、薄肉部１４３１１と、１対の厚肉部１４３１２、１４３１２とを有する。絶縁キャップ本体１４３１Ａは、１つの部品で構成される。つまり、薄肉部１４３１１と、１対の厚肉部１４３１２、１４３１２は、一体的に形成されている。 As shown in FIG. 12, the insulating cap main body 1431A has a thin portion 14311 and a pair of thick portions 14312 and 14312. The insulating cap body 1431A is composed of one component. That is, the thin portion 14311 and the pair of thick portions 14312 and 14312 are integrally formed.
　薄肉部１４３１１は、略矩形の板形状である。薄肉部１４３１１は、Ｘ方向に垂直な方向に沿って配置されている。薄肉部１４３１１の厚み方向は、Ｘ方向である。つまり、薄肉部１４３１１のＸ方向の長さ（厚み）は、薄肉部１４３１１のＹ方向の長さおよびＺ方向の長さよりも小さい。薄肉部１４３１１は、Ｘ＋方向を向いた面１４３１１ａを有する。面１４３１１ａは、Ｘ方向に垂直である。 The thin portion 14311 has a substantially rectangular plate shape. The thin portion 14311 is disposed along a direction perpendicular to the X direction. The thickness direction of the thin portion 14311 is the X direction. That is, the length (thickness) in the X direction of the thin portion 14311 is smaller than the length in the Y direction and the length in the Z direction of the thin portion 14311. The thin portion 14311 has a surface 14311a facing the X + direction. The surface 14311a is perpendicular to the X direction.
　１対の厚肉部１４３１２、１４３１２は、薄肉部１４３１１のＺ方向の両端に接続されている。厚肉部１４３１２のＸ方向の長さ（厚み）は、薄肉部１４３１１のＸ方向の長さ（厚み）よりも大きい。各厚肉部１４３１２は、Ｘ＋方向を向いた面１４３１２ａを有する。各面１４３１２ａは、平坦な１つの面ではない。各面１４３１２ａは、複数の面で構成される。各面１４３１２ａは、薄肉部１４３１１の面１４３１１ａからＸ＋方向に離れている。つまり、１対の厚肉部１４３１２、１４３１２が有する１対の面１４３１２ａ、１４３１２ａと薄肉部１４３１１の面１４３１１ａとの境界は、段差状である。図１３に示すように、１対の厚肉部１４３１２、１４３１２におけるＸ－方向を向いた面と薄肉部１４３１１のＸ－方向を向いた面との境界は、段差状でない。 The pair of thick portions 14312 and 14312 are connected to both ends of the thin portion 14311 in the Z direction. The length (thickness) in the X direction of the thick portion 14312 is larger than the length (thickness) in the X direction of the thin portion 14311. Each thick portion 14312 has a surface 14312a facing the X + direction. Each surface 14312a is not one flat surface. Each surface 14312a includes a plurality of surfaces. Each surface 14312a is separated from the surface 14311a of the thin portion 14311 in the X + direction. That is, the boundary between the pair of surfaces 14312a and 14312a included in the pair of thick portions 14312 and 14312 and the surface 14311a of the thin portion 14311 is stepped. As shown in FIG. 13, the boundary between the surface facing the X-direction of the pair of thick portions 14312 and 14312 and the surface facing the X-direction of the thin portion 14311 is not stepped.
　図１２に示すように、各厚肉部１４３１２は、面１４３１２ａに、凸部１４３１２ｃを有する。つまり、絶縁キャップ部１４３は、絶縁キャップ本体１４３１Ａに、１対の凸部１４３１２ｃを有する。各凸部１４３１２ｃは、Ｘ＋方向に突出している。各凸部１４３１２ｃは、円筒状である。 As shown in FIG. 12, each thick portion 14312 has a convex portion 14312c on the surface 14312a. That is, the insulating cap part 143 has a pair of convex parts 14312c on the insulating cap main body 1431A. Each convex portion 14312c protrudes in the X + direction. Each convex part 14312c is cylindrical.
　図１３に示すように、厚肉部１４３１２は、Ｘ－方向を向いた面に、凹部１４３１２ｄを有する。凹部１４３１２ｄは、Ｘ－方向から見て円形状である。凹部１４３１２ｄは、Ｘ方向に見て、凸部１４３１２ｃに重なる位置にある。Ｘ方向に見て、凹部１４３１２ｄの大きさは、凸部１４３１２ｃの大きさとほぼ同じかそれよりも若干大きい。凹部１４３１２ｄのＸ方向の長さ（深さ）は、凸部１４３１２ｃのＸ方向の長さよりも小さい。 As shown in FIG. 13, the thick portion 14312 has a recess 14312d on the surface facing the X-direction. The recess 14312d has a circular shape when viewed from the X-direction. The concave portion 14312d is at a position overlapping the convex portion 14312c when viewed in the X direction. When viewed in the X direction, the size of the concave portion 14312d is substantially the same as or slightly larger than the size of the convex portion 14312c. The length (depth) of the concave portion 14312d in the X direction is smaller than the length of the convex portion 14312c in the X direction.
　図１２および図１３に示すように、各厚肉部１４３１２は、厚肉部１４３１２をＸ方向に貫通する貫通孔１４３１２ｅを有する。つまり、絶縁キャップ部１４３は、絶縁キャップ本体１４３１Ａに、１対の貫通孔１４３１２ｅを有する。各貫通孔１４３１２ｅは、凸部１４３１２ｃおよび凹部１４３１２ｄの中央を通る。 As shown in FIGS. 12 and 13, each thick portion 14312 has a through-hole 14312e that penetrates the thick portion 14312 in the X direction. That is, the insulating cap part 143 has a pair of through holes 14312e in the insulating cap main body 1431A. Each through hole 14312e passes through the center of the convex portion 14312c and the concave portion 14312d.
　図１２に示すように、各厚肉部１４３１２は、係止部１４３１２ｂを有する。つまり、絶縁キャップ本体１４３１Ａは、１対の係止部１４３１２ｂ、１４３１２ｂを有する。１対の係止部１４３１２ｂ、１４３１２ｂは、１対の厚肉部１４３１２、１４３１２のＺ方向に向かい合う面に形成されている。一方の係止部１４３１２ｂは、他方の係止部１４３１２ｂに向かってＺ方向に突出している。各係止部１４３１２ｂは、各厚肉部１４３１２におけるＸ＋方向の端部に形成されている。 As shown in FIG. 12, each thick part 14312 has a locking part 14312b. That is, the insulating cap body 1431A has a pair of locking portions 14312b and 14312b. The pair of locking portions 14312b and 14312b are formed on the surfaces of the pair of thick portions 14312 and 14312 facing in the Z direction. One locking portion 14312b protrudes in the Z direction toward the other locking portion 14312b. Each locking portion 14312b is formed at the end of each thick portion 14312 in the X + direction.
　絶縁キャップ本体１４３１Ａは、金属ケース部品１４１１および金属ケース部品１４１２に取り付けられる。絶縁キャップ本体１４３１Ａは、図７に示すネジ２４を用いて、金属ケース部品１４１１にねじ止めされる。ねじ止めの具体的な手順は、以下のとおりである。 The insulating cap body 1431A is attached to the metal case part 1411 and the metal case part 1412. The insulating cap body 1431A is screwed to the metal case component 1411 using the screws 24 shown in FIG. The specific procedure for screwing is as follows.
　まず、絶縁キャップ本体１４３１Ａの一部が、金属ケース部品１４１１の主板部１４１１１のＹ－方向の端部に対して、Ｘ方向に重ねられる（図９参照）。このとき、絶縁キャップ本体１４３１Ａの薄肉部１４３１１の一部と１対の厚肉部１４３１２、１４３１２の一部が、金属ケース部品１４１１の内面１４１１１ａのＹ－方向の端部に接触する。この状態で、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２が、図７に示すネジ２４を用いて、金属ケース部品１４１１の主板部１４１１１にねじ止めされる。 First, a part of the insulating cap main body 1431A is overlapped in the X direction with respect to the Y-direction end portion of the main plate portion 14111 of the metal case component 1411 (see FIG. 9). At this time, a part of the thin part 14311 of the insulating cap body 1431A and a part of the pair of thick parts 14312 and 14312 are in contact with the end part in the Y-direction of the inner surface 14111a of the metal case component 1411. In this state, the pair of thick portions 14312 and 14312 of the insulating cap body 1431A are screwed to the main plate portion 14111 of the metal case component 1411 using the screws 24 shown in FIG.
　絶縁キャップ本体１４３１Ａは、図７に示すネジ２５を用いて、金属ケース部品１４１２にねじ止めされる。ねじ止めの具体的な手順は、以下のとおりである。 The insulating cap main body 1431A is screwed to the metal case component 1412 using the screws 25 shown in FIG. The specific procedure for screwing is as follows.
　まず、絶縁キャップ本体１４３１Ａの一部が、金属ケース部品１４１２の主板部１４１２１のＹ－方向の一端部に対して、Ｘ方向に重ねられる（図９参照）。このとき、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２の一部が、金属ケース部品１４１２の内面１４１２１ａのＹ－方向の端部に接触する。絶縁キャップ本体１４３１Ａの薄肉部１４３１１は、金属ケース部品１４１２に接触しない。この状態で、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２が、図７に示すネジ２５を用いて、金属ケース部品１４１２の主板部１４１２１にねじ止めされる。 First, a part of the insulating cap body 1431A is overlapped in the X direction with respect to one end portion in the Y-direction of the main plate portion 14121 of the metal case component 1412 (see FIG. 9). At this time, a part of the pair of thick portions 14312 and 14312 of the insulating cap body 1431A comes into contact with the Y-direction end of the inner surface 14121a of the metal case component 1412. The thin portion 14311 of the insulating cap body 1431A does not contact the metal case component 1412. In this state, the pair of thick portions 14312 and 14312 of the insulating cap main body 1431A are screwed to the main plate portion 14121 of the metal case component 1412 using the screws 25 shown in FIG.
　絶縁キャップ本体１４３１Ａと同様に、絶縁キャップ本体１４３１Ｂも、金属ケース部品１４１１および金属ケース部品１４１２に取り付けられる。絶縁キャップ本体１４３１Ａと同様に、絶縁キャップ本体１４３１Ｂは、図７に示すネジ２４およびネジ２５を用いて、金属ケース部品１４１１および金属ケース部品１４１２にねじ止めされる。 Similarly to the insulating cap body 1431A, the insulating cap body 1431B is also attached to the metal case part 1411 and the metal case part 1412. Similar to the insulating cap main body 1431A, the insulating cap main body 1431B is screwed to the metal case component 1411 and the metal case component 1412 using the screw 24 and the screw 25 shown in FIG.
　（４－２）絶縁カバー１４３２Ａおよび絶縁カバー１４３２Ｂの構成
　絶縁カバー１４３２Ａと絶縁カバー１４３２Ｂは、互いに同じ形状および大きさを有する。以下、絶縁カバー１４３２Ａについて説明し、絶縁カバー１４３２Ｂについての説明は省略する。 (4-2) Configuration of Insulating Cover 1432A and Insulating Cover 1432B The insulating cover 1432A and the insulating cover 1432B have the same shape and size. Hereinafter, the insulating cover 1432A will be described, and the description of the insulating cover 1432B will be omitted.
　図１４に示すように、絶縁カバー１４３２ＡのＺ方向の最大長さは、絶縁カバー１４３２ＡのＹ方向の最大長さよりも大きい。絶縁カバー１４３２ＡのＸ方向の最大長さは、絶縁カバー１４３２ＡのＹ方向の最大長さよりも小さい。図６および図７に示すように、絶縁カバー１４３２ＡのＺ方向の最大長さは、絶縁キャップ本体１４３１ＡのＺ方向の最大長さよりも小さい。絶縁カバー１４３２ＡのＸ方向の最大長さは、絶縁キャップ本体１４３１ＡのＸ方向の最大長さよりも若干小さい。絶縁カバー１４３２ＡのＹ方向の最大長さは、絶縁キャップ本体１４３１ＡのＹ方向の最大長さよりも大きい。絶縁カバー１４３２ＡのＹ方向の最大長さは、金属ケース１４１のＹ方向の長さよりも大幅に小さい。 As shown in FIG. 14, the maximum length of the insulating cover 1432A in the Z direction is larger than the maximum length of the insulating cover 1432A in the Y direction. The maximum length in the X direction of the insulating cover 1432A is smaller than the maximum length in the Y direction of the insulating cover 1432A. As shown in FIGS. 6 and 7, the maximum length of the insulating cover 1432A in the Z direction is smaller than the maximum length of the insulating cap body 1431A in the Z direction. The maximum length in the X direction of the insulating cover 1432A is slightly smaller than the maximum length in the X direction of the insulating cap main body 1431A. The maximum length in the Y direction of the insulating cover 1432A is larger than the maximum length in the Y direction of the insulating cap body 1431A. The maximum length of the insulating cover 1432A in the Y direction is significantly smaller than the length of the metal case 141 in the Y direction.
　図１４に示すように、絶縁カバー１４３２Ａは、主板部１４３２１と、１対の側板部１４３２２、１４３２２とを有する。絶縁カバー１４３２Ａは、１つの部品で構成される。つまり、主板部１４３２１と、１対の側板部１４３２２、１４３２２は、一体的に形成されている。 As shown in FIG. 14, the insulating cover 1432A has a main plate portion 14321 and a pair of side plate portions 14322 and 14322. The insulating cover 1432A is composed of one component. That is, the main plate portion 14321 and the pair of side plate portions 14322 and 14322 are integrally formed.
　主板部１４３２１は、矩形の平坦な板形状である。主板部１４３２１は、Ｘ方向に垂直な方向に沿って配置されている。主板部１４３２１の厚み方向は、Ｘ方向である。つまり、主板部１４３２１のＸ方向の長さ（厚み）は、主板部１４３２１のＹ方向の長さおよびＺ方向の長さＸ方向よりも小さい。主板部１４３２１のＺ方向の長さは、主板部１４３２１のＹ方向の長さよりも大きい。図６および図７に示すように、主板部１４３２１のＺ方向の長さは、金属ケース部品１４１２の切欠１４１２１ｂのＺ方向の長さと同じかほぼ同じである。主板部１４３２１のＹ方向の長さは、金属ケース部品１４１２の切欠１４１２１ｂのＹ方向の長さよりも大きい。 The main plate portion 14321 has a rectangular flat plate shape. The main plate portion 14321 is disposed along a direction perpendicular to the X direction. The thickness direction of the main plate portion 14321 is the X direction. That is, the length (thickness) in the X direction of the main plate portion 14321 is smaller than the length in the Y direction and the length X direction in the Z direction of the main plate portion 14321. The length of the main plate portion 14321 in the Z direction is larger than the length of the main plate portion 14321 in the Y direction. As shown in FIGS. 6 and 7, the length in the Z direction of the main plate portion 14321 is the same as or substantially the same as the length in the Z direction of the notch 14121b of the metal case component 1412. The length in the Y direction of the main plate portion 14321 is larger than the length in the Y direction of the notch 14121b of the metal case component 1412.
　１対の側板部１４３２２、１４３２２は、主板部１４３２１のＺ方向の両端に接続されている。つまり、一方の側板部１４３２２と他方の側板部１４３２２は、Ｚ方向に離れている。１対の側板部１４３２２、１４３２２は、主板部１４３２１からＸ－方向に突出している。言い換えると、１対の側板部１４３２２、１４３２２は、絶縁キャップ本体１４３１Ａの薄肉部１４３１１に向かって突出している（図７参照）。各側板部１４３２２は、係止片１４３２２ａを有する。つまり、絶縁カバー１４３２Ａは、１対の係止片１４３２２ａ、１４３２２ａを有する。各係止片１４３２２ａは、側板部１４３２２のＹ方向の中央部にある。各係止片１４３２２ａは、Ｚ方向の力によって弾性変形できるように形成されている。各側板部１４３２２は、係止片１４３２２ａの突出方向（Ｘ－方向）の先端部に、係止爪１４３２２ｂを有する。つまり、絶縁カバー１４３２Ａは、１対の係止爪１４３２２ｂ、１４３２２ｂを有する。 The pair of side plate portions 14322 and 14322 are connected to both ends of the main plate portion 14321 in the Z direction. That is, one side plate portion 14322 and the other side plate portion 14322 are separated in the Z direction. The pair of side plate portions 14322 and 14322 protrudes from the main plate portion 14321 in the X-direction. In other words, the pair of side plate portions 14322 and 14322 protrudes toward the thin portion 14311 of the insulating cap main body 1431A (see FIG. 7). Each side plate portion 14322 has a locking piece 14322a. That is, the insulating cover 1432A has a pair of locking pieces 14322a and 14322a. Each locking piece 14322a is at the center of the side plate portion 14322 in the Y direction. Each locking piece 14322a is formed so as to be elastically deformable by a force in the Z direction. Each side plate portion 14322 has a locking claw 14322b at the tip of the locking piece 14322a in the protruding direction (X-direction). That is, the insulating cover 1432A has a pair of locking claws 14322b and 14322b.
　図６および図７に示すように、絶縁カバー１４３２Ａの一部は、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２の間に配置される。絶縁カバー１４３２Ａは、絶縁キャップ本体１４３１Ａに取り付けられる。絶縁カバー１４３２Ａは、ネジ等の固定部品を使用することなく、絶縁キャップ本体１４３１Ａに取り付けられる。具体的には、絶縁カバー１４３２Ａは、Ｘ方向に押圧されて、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２の間に嵌め込まれる。嵌め込み時、絶縁カバー１４３２Ａの１対の係止片１４３２２ａ、１４３２２ａは弾性変形する。嵌め込まれた状態において、絶縁カバー１４３２Ａの１対の係止爪１４３２２ｂ、１４３２２ｂは、絶縁キャップ本体１４３１Ａの１対の係止部１４３１２ｂ、１４３１２ｂに引っ掛かっている。これにより、絶縁カバー１４３２Ａは、絶縁キャップ本体１４３１Ａから外れにくくなっている。 6 and 7, a part of the insulating cover 1432A is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A. The insulating cover 1432A is attached to the insulating cap body 1431A. The insulating cover 1432A is attached to the insulating cap body 1431A without using a fixing component such as a screw. Specifically, the insulating cover 1432A is pressed in the X direction and is fitted between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A. When fitted, the pair of locking pieces 14322a and 14322a of the insulating cover 1432A is elastically deformed. In the fitted state, the pair of locking claws 14322b and 14322b of the insulating cover 1432A are hooked on the pair of locking portions 14312b and 14312b of the insulating cap body 1431A. As a result, the insulating cover 1432A is not easily detached from the insulating cap body 1431A.
　図６に示すように、絶縁カバー１４３２Ａの一部は、金属ケース部品１４１２の主板部１４１２１のＹ－方向の端部に形成された切欠１４１２１ｂの内側に配置される。 As shown in FIG. 6, a part of the insulating cover 1432A is disposed inside a notch 14121b formed at the end of the main plate portion 14121 of the metal case component 1412 in the Y-direction.
　絶縁カバー１４３２Ａと同様に、絶縁カバー１４３２Ｂの一部は、絶縁キャップ本体１４３１Ｂの１対の厚肉部１４３１２、１４３１２の間に配置される。絶縁カバー１４３２Ａと同様に、絶縁カバー１４３２Ｂは、絶縁キャップ本体１４３１Ｂに取り付けられる。絶縁カバー１４３２Ａと同様に、絶縁カバー１４３２Ｂの一部は、金属ケース部品１４１２の主板部１４１２１のＹ＋方向の端部に形成された切欠１４１２１ｂの内側に配置される。 Similarly to the insulating cover 1432A, a part of the insulating cover 1432B is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431B. Similar to the insulating cover 1432A, the insulating cover 1432B is attached to the insulating cap body 1431B. Similar to the insulating cover 1432A, a part of the insulating cover 1432B is disposed inside a notch 14121b formed at the end of the main plate portion 14121 of the metal case component 1412 in the Y + direction.
　（５）内側ケース１４２の構成
　図９に示すように、内側ケース１４２は、金属ケース１４１の内側に配置される。内側ケース１４２は、可撓性を有するフィルムで形成されている。フィルムは、合成樹脂で形成されている。フィルムは、液体を透過させない性質を有する。内側ケース１４２は、可撓性を有するフィルムで形成されていることにより、内側からの圧力に応じて容積を変化させることができる。内側ケース１４２は、金属ケース１４１よりも剛性が低い。 (5) Configuration of Inner Case 142 As shown in FIG. 9, the inner case 142 is disposed inside the metal case 141. The inner case 142 is formed of a flexible film. The film is made of a synthetic resin. The film has a property of not allowing liquid to permeate. Since the inner case 142 is formed of a flexible film, the volume can be changed according to the pressure from the inner side. The inner case 142 is less rigid than the metal case 141.
　内側ケース１４２は、１対の電極シート１４６、１４７と、３つのセパレータ１４８Ａ、１４８Ｂ、１４８Ｃを収容する。さらに、内側ケース１４２は、１対のリードタブ１４４１、１４５１の一部を収容する。１対のリードタブ１４４１、１４５１は、１対の電極シート１４６、１４７に接続されている。１対のリードタブ１４４１、１４５１の一部は、内側ケース１４２の外部に配置される。内側ケース１４２は、１対のリードタブ１４４１、１４５１が貫通した状態で、密閉性を有する。内側ケース１４２には、電解質１４９が封入されている。 The inner case 142 accommodates a pair of electrode sheets 146 and 147 and three separators 148A, 148B and 148C. Further, the inner case 142 accommodates a part of the pair of lead tabs 1441 and 1451. The pair of lead tabs 1441 and 1451 are connected to the pair of electrode sheets 146 and 147. A part of the pair of lead tabs 1441 and 1451 is disposed outside the inner case 142. The inner case 142 has a sealing property with a pair of lead tabs 1441 and 1451 penetrating therethrough. An electrolyte 149 is sealed in the inner case 142.
　内側ケース１４２は、Ｘ方向において、金属ケース部品１４１１の内面１４１１１ａと面接触する。内側ケース１４２が内面１４１１１ａと面接触している状態において、内側ケース１４２は、金属ケース部品１４１２の内面１４１２１ａからＸ方向（Ｘ＋方向）に離れている。 The inner case 142 is in surface contact with the inner surface 14111a of the metal case component 1411 in the X direction. In a state where the inner case 142 is in surface contact with the inner surface 14111a, the inner case 142 is separated from the inner surface 14121a of the metal case component 1412 in the X direction (X + direction).
　（６）１対の電極シート１４６、１４７の構成
　負極シート１４６および正極シート１４７は、それぞれ、矩形のシート状である。負極シート１４６および正極シート１４７は、広げられつつ積層された状態で、内側ケース１４２に収容されている。負極シート１４６と正極シート１４７は、Ｘ方向に積層されている。負極シート１４６および正極シート１４７は、それぞれ、Ｘ方向に垂直な方向に沿っている。つまり、負極シート１４６と正極シート１４７は、互いに平行またはほぼ平行に配置されている。 (6) Configuration of a pair of electrode sheets 146 and 147 The negative electrode sheet 146 and the positive electrode sheet 147 each have a rectangular sheet shape. The negative electrode sheet 146 and the positive electrode sheet 147 are accommodated in the inner case 142 in a state of being laminated while being spread. The negative electrode sheet 146 and the positive electrode sheet 147 are laminated in the X direction. The negative electrode sheet 146 and the positive electrode sheet 147 are each along a direction perpendicular to the X direction. That is, the negative electrode sheet 146 and the positive electrode sheet 147 are arranged in parallel or substantially parallel to each other.
　負極シート１４６のＹ方向の長さは、負極シート１４６のＺ方向の長さよりも大きい。負極シート１４６のＸ方向の長さ（厚み）は、負極シート１４６のＺ方向の長さよりも小さい。Ｘ方向に見て、正極シート１４７の大きさは、負極シート１４６の大きさと同じであってもよく、異なっていてもよい。正極シート１４７のＹ方向の長さは、正極シート１４７のＺ方向の長さよりも大きい。正極シート１４７のＸ方向の長さ（厚み）は、正極シート１４７のＺ方向の長さよりも小さい。 The length of the negative electrode sheet 146 in the Y direction is larger than the length of the negative electrode sheet 146 in the Z direction. The length (thickness) of the negative electrode sheet 146 in the X direction is smaller than the length of the negative electrode sheet 146 in the Z direction. When viewed in the X direction, the size of the positive electrode sheet 147 may be the same as or different from the size of the negative electrode sheet 146. The length of the positive electrode sheet 147 in the Y direction is larger than the length of the positive electrode sheet 147 in the Z direction. The length (thickness) of the positive electrode sheet 147 in the X direction is smaller than the length of the positive electrode sheet 147 in the Z direction.
　正極シート１４７は、集電体と、集電体を覆う正極膜とを含む。集電体は、アルミニウムを含む金属材料で形成されている。正極膜は、正極活物質と、バインダとを含む。バインダは、例えば、ポリフッ化ビニリデンである。金属ケース型二次セル１４がリチウムイオンセルの場合、正極活物質は、リチウムと遷移金属の複合酸化物を含む。具体的には、例えば、正極活物質は、コバルト酸リチウム、マンガン酸リチウム、リン酸鉄リチウム、リチウムとニッケルとマンガンとコバルトとを含む酸化物、リチウムとニッケルとコバルトとアルミニウムとを含む酸化物のうち、いずれか少なくとも１つを含んでもよい。なお、正極シート１４７は、二次セルに使用できる構成であれば、上記以外の構成であってもよい。 The positive electrode sheet 147 includes a current collector and a positive electrode film covering the current collector. The current collector is formed of a metal material containing aluminum. The positive electrode film includes a positive electrode active material and a binder. The binder is, for example, polyvinylidene fluoride. When the metal case type secondary cell 14 is a lithium ion cell, the positive electrode active material includes a composite oxide of lithium and a transition metal. Specifically, for example, the positive electrode active material includes lithium cobalt oxide, lithium manganate, lithium iron phosphate, an oxide containing lithium, nickel, manganese, and cobalt, and an oxide containing lithium, nickel, cobalt, and aluminum. Any one of them may be included. Note that the positive electrode sheet 147 may have a configuration other than the above as long as it can be used for the secondary cell.
　負極シート１４６は、集電体と、集電体を覆う負極膜とを含む。集電体は、銅を含む金属材料で形成されている。負極膜は、負極活物質と、バインダとを含む。バインダは、例えば、ポリフッ化ビニリデンである。負極活物質は、例えば、炭素を含む。具体的には、例えば、負極活物質は、黒鉛、ソフトカーボン、ハードカーボンのうち、いずれか少なくとも１つを含んでいてもよい。負極活物質は、炭素を含まなくてもよい。この場合、負極活物質は、例えば、チタン酸リチウムを含んでいてもよい。なお、負極シート１４６は、二次セルに使用できる構成であれば、上記以外の構成であってもよい。 The negative electrode sheet 146 includes a current collector and a negative electrode film that covers the current collector. The current collector is made of a metal material containing copper. The negative electrode film includes a negative electrode active material and a binder. The binder is, for example, polyvinylidene fluoride. The negative electrode active material includes, for example, carbon. Specifically, for example, the negative electrode active material may include at least one of graphite, soft carbon, and hard carbon. The negative electrode active material may not contain carbon. In this case, the negative electrode active material may contain, for example, lithium titanate. Note that the negative electrode sheet 146 may have a configuration other than the above as long as it can be used for the secondary cell.
　（７）電解質の構成
　電解質１４９は、電解液である。金属ケース型二次セル１４がリチウムイオンセルの場合、電解液は、例えば、有機溶媒にリチウム塩を溶解させた有機電解液である。有機溶媒は、例えば、エチレンカーボネート、プロピレンカーボネート、ジメチルカーボネート、ジエチルカーボネート、エチルメチルカーボネートである。リチウム塩は、例えば、ヘキサフルオロリン酸リチウム、ホウフッ化リチウム、過塩素酸リチウムである。電解質１４９は、上記の有機電解液に対して、ポリマーを加えることにより、ゲル化したものであってもよい。ポリマーは、例えば、ポリエチレンオキシド、ポリプロピレンオキシド、ポリフッ化ビニリデンである。 (7) Structure of electrolyte The electrolyte 149 is an electrolytic solution. When the metal case type secondary cell 14 is a lithium ion cell, the electrolytic solution is, for example, an organic electrolytic solution in which a lithium salt is dissolved in an organic solvent. The organic solvent is, for example, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, or ethyl methyl carbonate. Examples of the lithium salt include lithium hexafluorophosphate, lithium borofluoride, and lithium perchlorate. The electrolyte 149 may be gelled by adding a polymer to the organic electrolytic solution. Examples of the polymer include polyethylene oxide, polypropylene oxide, and polyvinylidene fluoride.
　（８）セパレータ１４８Ａ、１４８Ｂ、１４８Ｃの構成
　セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、それぞれ、矩形のシート状である。セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、同じ形状および大きさを有する。セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、それぞれ、Ｘ方向に垂直な方向に沿っている。セパレータ１４８Ａ、１４８Ｂ、１４８Ｃと、１対の電極シート１４６、１４７は、平行またはほぼ平行に配置されている。 (8) Configuration of Separator 148A, 148B, 148C Each of the separators 148A, 148B, 148C has a rectangular sheet shape. Separator 148A, 148B, 148C has the same shape and size. The separators 148A, 148B, and 148C are along the direction perpendicular to the X direction. The separators 148A, 148B, 148C and the pair of electrode sheets 146, 147 are arranged in parallel or substantially in parallel.
　セパレータ１４８Ａは、負極シート１４６と金属ケース部品１４１２との間に配置されている。セパレータ１４８Ｂは、負極シート１４６と正極シート１４７の間に配置されている。セパレータ１４８Ｃは、正極シート１４７と金属ケース部品１４１１との間に配置されている。Ｘ方向に見て、セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、それぞれ、負極シート１４６の全体に重なる。Ｘ方向に見て、セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、それぞれ、正極シート１４７の全体に重なる。セパレータ１４８Ａとセパレータ１４８Ｃは無くてもよい。 The separator 148 </ b> A is disposed between the negative electrode sheet 146 and the metal case component 1412. The separator 148 </ b> B is disposed between the negative electrode sheet 146 and the positive electrode sheet 147. The separator 148 </ b> C is disposed between the positive electrode sheet 147 and the metal case component 1411. When viewed in the X direction, the separators 148A, 148B, and 148C overlap the entire negative electrode sheet 146, respectively. When viewed in the X direction, the separators 148A, 148B, and 148C overlap the entire positive electrode sheet 147, respectively. Separator 148A and separator 148C may be omitted.
　セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、同じ材料で形成されている。セパレータ１４８Ａ、１４８Ｂ、１４８Ｃは、例えば、ポリプロピレンで形成されている。セパレータ１４８Ａ、１４８Ｂ、１４８Ｃの構造は、液体を保持可能な構造である。セパレータ１４８Ａ、１４８Ｂ、１４８Ｃの構造は、例えば、複数の微細孔を有する多孔構造である。 The separators 148A, 148B, 148C are formed of the same material. The separators 148A, 148B, 148C are made of, for example, polypropylene. The structures of the separators 148A, 148B, and 148C are structures that can hold a liquid. The structure of the separators 148A, 148B, and 148C is, for example, a porous structure having a plurality of fine holes.
　液状の電解質１４９は、セパレータ１４８Ａ、１４８Ｂ、１４８Ｃの内部に浸み込んでいる。負極シート１４６は、セパレータ１４８Ｂまたは／およびセパレータ１４８Ｃと接することで電解質１４９に接触していてもよい。負極シート１４６は、セパレータ１４８Ｂと負極シート１４６との隙間または／およびセパレータ１４８Ｃと負極シート１４６との隙間に存在する電解質１４９に接触していてもよい。正極シート１４７は、セパレータ１４８Ａまたは／およびセパレータ１４８Ｂと接することで電解質１４９に接触していてもよい。正極シート１４７は、セパレータ１４８Ａと正極シート１４７との隙間または／およびセパレータ１４８Ｂと正極シート１４７との隙間に存在する電解質１４９に接触していてもよい。このように、内側ケース１４２内において、１対の電極シート１４６、１４７は、電解質１４９に接触している。 The liquid electrolyte 149 is immersed in the separators 148A, 148B, and 148C. The negative electrode sheet 146 may be in contact with the electrolyte 149 by being in contact with the separator 148B or / and the separator 148C. The negative electrode sheet 146 may be in contact with the electrolyte 149 present in the gap between the separator 148B and the negative electrode sheet 146 and / or the gap between the separator 148C and the negative electrode sheet 146. The positive electrode sheet 147 may be in contact with the electrolyte 149 by being in contact with the separator 148A or / and the separator 148B. The positive electrode sheet 147 may be in contact with the electrolyte 149 present in the gap between the separator 148A and the positive electrode sheet 147 or / and the gap between the separator 148B and the positive electrode sheet 147. Thus, in the inner case 142, the pair of electrode sheets 146 and 147 are in contact with the electrolyte 149.
　（９）１対のセル端子１４４、１４５の構成
　１対のセル端子１４４、１４５は、１対の電極シート１４６、１４７のＹ方向の両側に配置される。セル端子１４４は、負極シート１４６に電気的に接続され、セル端子１４５は、正極シート１４７に電気的に接続される。上述したように、セル端子１４４は、リードタブ１４４１と、外部端子１４４２とを有し、セル端子１４５は、リードタブ１４５１と、外部端子１４５２とを有する。 (9) Configuration of a pair of cell terminals 144 and 145 The pair of cell terminals 144 and 145 are disposed on both sides of the pair of electrode sheets 146 and 147 in the Y direction. The cell terminal 144 is electrically connected to the negative electrode sheet 146, and the cell terminal 145 is electrically connected to the positive electrode sheet 147. As described above, the cell terminal 144 has the lead tab 1441 and the external terminal 1442, and the cell terminal 145 has the lead tab 1451 and the external terminal 1452.
　（９－１）１対のリードタブ１４４１、１４５１の構成
　１対のリードタブ１４４１、１４５１は、１対の電極シート１４６、１４７のＹ方向の両端部に接続されている。リードタブ１４４１、１４５１は、矩形のシート状である。１対のリードタブ１４４１、１４５１は、１対の電極シート１４６、１４７のＺ方向の中央部に接続されている（図８参照）。 (9-1) Configuration of a pair of lead tabs 1441, 1451 The pair of lead tabs 1441, 1451 are connected to both ends of the pair of electrode sheets 146, 147 in the Y direction. The lead tabs 1441 and 1451 have a rectangular sheet shape. The pair of lead tabs 1441 and 1451 are connected to the center portion in the Z direction of the pair of electrode sheets 146 and 147 (see FIG. 8).
　リードタブ１４４１は、負極シート１４６の集電体に接続されている。本発明の実施形態の具体例では、リードタブ１４４１は、負極シート１４６の集電体と一体的に形成されている。リードタブ１４４１は、銅を含む金属材料で形成されている。 The lead tab 1441 is connected to the current collector of the negative electrode sheet 146. In the specific example of the embodiment of the present invention, the lead tab 1441 is formed integrally with the current collector of the negative electrode sheet 146. The lead tab 1441 is formed of a metal material containing copper.
　リードタブ１４５１は、正極シート１４７の集電体に接続されている。本発明の実施形態の具体例では、リードタブ１４５１は、正極シート１４７の集電体と一体的に形成されている。リードタブ１４５１は、アルミニウムを含む金属材料で形成されている。 The lead tab 1451 is connected to the current collector of the positive electrode sheet 147. In the specific example of the embodiment of the present invention, the lead tab 1451 is formed integrally with the current collector of the positive electrode sheet 147. The lead tab 1451 is formed of a metal material containing aluminum.
　図７、図８および図９に示すように、リードタブ１４４１の一部は、内側ケース１４２からＹ－方向に突出している。リードタブ１４４１の一部は、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２の間に配置される。Ｘ方向に見た場合、リードタブ１４４１の一部は、絶縁キャップ本体１４３１Ａの薄肉部１４３１１に重なる。 As shown in FIG. 7, FIG. 8, and FIG. 9, a part of the lead tab 1441 protrudes from the inner case 142 in the Y-direction. A part of the lead tab 1441 is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A. When viewed in the X direction, a part of the lead tab 1441 overlaps the thin portion 14311 of the insulating cap body 1431A.
　リードタブ１４５１の一部は、内側ケース１４２からＹ＋方向に突出している。つまり、リードタブ１４５１の一部は、リードタブ１４４１の一部が内側ケース１４２から突出する方向と逆方向に突出している。リードタブ１４５１の一部は、絶縁キャップ本体１４３１Ｂの１対の厚肉部１４３１２、１４３１２の間に配置される。Ｘ方向に見た場合、リードタブ１４５１の一部は、絶縁キャップ本体１４３１Ｂの薄肉部１４３１１に重なる。 A part of the lead tab 1451 protrudes from the inner case 142 in the Y + direction. That is, a part of the lead tab 1451 protrudes in a direction opposite to the direction in which a part of the lead tab 1441 protrudes from the inner case 142. A part of the lead tab 1451 is disposed between the pair of thick portions 14312 and 14312 of the insulating cap body 1431B. When viewed in the X direction, a part of the lead tab 1451 overlaps the thin portion 14311 of the insulating cap body 1431B.
　（９－２）１対の外部端子１４４２、１４５２の構成
　図８および図９に示すように、１対の外部端子１４４２、１４５２は、内側ケース１４２の外部に配置される。１対の外部端子１４４２、１４５２は、絶縁キャップ部１４３に設置される。より詳細には、１対の外部端子１４４２、１４５２は、１対の絶縁キャップ本体１４３１Ａ、１４３１Ｂに設置される。外部端子１４４２は、金属ケース型二次セル１４のＹ－方向の端面の一部を構成し、外部端子１４５２は、金属ケース型二次セル１４のＹ＋方向の端面の一部を構成する。金属ケース１４１のＹ方向の両端の開口部は、１対の絶縁キャップ１４３Ａ、１４３Ｂと１対の外部端子１４４２、１４５２によって塞がれている。但し、金属ケース１４１は、内側ケース１４２ほどの高い密閉性を確保できなくてよい。金属ケース１４１の内部で且つ内側ケース１４２の外部の空間は、金属ケース１４１の外部の空間と、空気が連通可能であってもよい。 (9-2) Configuration of a Pair of External Terminals 1442 and 1452 As shown in FIGS. 8 and 9, the pair of external terminals 1442 and 1452 is disposed outside the inner case 142. The pair of external terminals 1442 and 1452 are installed on the insulating cap portion 143. More specifically, the pair of external terminals 1442 and 1452 are installed on the pair of insulating cap bodies 1431A and 1431B. The external terminal 1442 constitutes a part of the end surface in the Y-direction of the metal case type secondary cell 14, and the external terminal 1452 constitutes a part of the end face in the Y + direction of the metal case type secondary cell 14. Openings at both ends in the Y direction of the metal case 141 are closed by a pair of insulating caps 143A and 143B and a pair of external terminals 1442 and 1452. However, the metal case 141 may not be able to ensure as high a sealing property as the inner case 142. The space inside the metal case 141 and outside the inner case 142 may allow air to communicate with the space outside the metal case 141.
　外部端子１４４２は、リードタブ１４４１に接続される。外部端子１４４２は、リードタブ１４４１と別部材である。外部端子１４５２は、リードタブ１４５１に接続される。外部端子１４５２は、リードタブ１４５１と別部材である。外部端子１４４２および外部端子１４５２は、それぞれ、金属材料で形成されている。外部端子１４４２は、銅を含む金属材料で形成されている。一方、外部端子１４５２は、アルミニウムを含む金属材料で形成されている。 External terminal 1442 is connected to lead tab 1441. The external terminal 1442 is a separate member from the lead tab 1441. The external terminal 1452 is connected to the lead tab 1451. The external terminal 1452 is a separate member from the lead tab 1451. External terminal 1442 and external terminal 1452 are each formed of a metal material. External terminal 1442 is formed of a metal material containing copper. On the other hand, the external terminal 1452 is formed of a metal material containing aluminum.
　外部端子１４４２および外部端子１４５２は、互いに同じ形状および大きさを有している。以下では、外部端子１４４２について説明し、外部端子１４５２についての説明は省略する。 External terminal 1442 and external terminal 1452 have the same shape and size. Hereinafter, the external terminal 1442 will be described, and the description of the external terminal 1452 will be omitted.
　図１５に示すように、外部端子１４４２は、Ｚ＋方向に見てＬ字状である。外部端子１４４２は、中間接続部１４４２１と、外部接続部１４４２２とを有する。外部端子１４４２は、１つの部品で構成される。つまり、中間接続部１４４２１と外部接続部１４４２２は、一体的に形成されている。 As shown in FIG. 15, the external terminal 1442 is L-shaped when viewed in the Z + direction. The external terminal 1442 includes an intermediate connection portion 14421 and an external connection portion 14422. The external terminal 1442 is composed of one component. That is, the intermediate connection portion 14421 and the external connection portion 14422 are integrally formed.
　中間接続部１４４２１は、矩形の平坦な板形状である。中間接続部１４４２１は、Ｘ方向に垂直な方向に沿って配置されている。中間接続部１４４２１の厚み方向は、Ｘ方向である。つまり、中間接続部１４４２１のＸ方向の長さ（厚み）は、中間接続部１４４２１のＹ方向の長さおよびＺ方向の長さよりも小さい。 The intermediate connection portion 14421 has a rectangular flat plate shape. The intermediate connection portion 14421 is disposed along a direction perpendicular to the X direction. The thickness direction of the intermediate connection portion 14421 is the X direction. That is, the length (thickness) of the intermediate connection portion 14421 in the X direction is smaller than the length of the intermediate connection portion 14421 in the Y direction and the length in the Z direction.
　外部接続部１４４２２は、中間接続部１４４２１のＹ－方向の端に接続されている。外部接続部１４４２２のＺ方向の長さは、中間接続部１４４２１のＺ方向の長さよりも大きい。中間接続部１４４２１は、外部接続部１４４２２のＺ方向の中央部に接続されている。中間接続部１４４２１は、外部接続部１４４２２のＸ－方向の端に接続されている。 The external connection portion 14422 is connected to the Y-direction end of the intermediate connection portion 14421. The length of the external connection portion 14422 in the Z direction is larger than the length of the intermediate connection portion 14421 in the Z direction. The intermediate connection portion 14421 is connected to the center portion in the Z direction of the external connection portion 14422. The intermediate connection portion 14421 is connected to the X-direction end of the external connection portion 14422.
　外部接続部１４４２２は、矩形の平坦な板形状である。外部接続部１４４２２は、Ｙ方向に垂直な方向に沿って配置されている。外部接続部１４４２２の厚み方向は、Ｙ方向である。つまり、外部接続部１４４２２のＹ方向の長さ（厚み）は、外部接続部１４４２２のＸ方向の長さおよびＺ方向の長さよりも小さい。外部接続部１４４２２は、Ｙ－方向を向いた面１４４２２ａを有する。つまり、面１４４２２ａは、１対の電極シート１４６、１４７の積層方向（Ｘ方向）に垂直な方向を向いている。以下、面１４４２２ａを、接続面１４４２２ａという。接続面１４４２２ａは、Ｙ方向に垂直である。接続面１４４２２ａは、本発明の実施形態の接続面１４４ａの一例である。 The external connection portion 14422 has a rectangular flat plate shape. The external connection portion 14422 is disposed along a direction perpendicular to the Y direction. The thickness direction of the external connection portion 14422 is the Y direction. That is, the length (thickness) of the external connection portion 14422 in the Y direction is smaller than the length of the external connection portion 14422 in the X direction and the length in the Z direction. The external connection portion 14422 has a surface 14422a facing the Y-direction. That is, the surface 14422a faces a direction perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. Hereinafter, the surface 14422a is referred to as a connection surface 14422a. The connection surface 14422a is perpendicular to the Y direction. The connection surface 14422a is an example of the connection surface 144a according to the embodiment of the present invention.
　図７および図８に示すように、中間接続部１４４２１のＺ方向の長さは、リードタブ１４４１のＺ方向の長さと同じかほぼ同じである。外部接続部１４４２２のＺ方向の長さは、絶縁キャップ本体１４３１ＡのＺ方向の最大長さよりも小さい。外部接続部１４４２２のＸ方向の長さは、絶縁キャップ本体１４３１ＡのＸ方向の最大長さよりも小さい。 7 and 8, the length of the intermediate connecting portion 14421 in the Z direction is the same as or substantially the same as the length of the lead tab 1441 in the Z direction. The length of the external connection portion 14422 in the Z direction is smaller than the maximum length of the insulating cap body 1431A in the Z direction. The length of the external connection portion 14422 in the X direction is smaller than the maximum length of the insulating cap body 1431A in the X direction.
　図６、図８および図９に示すように、外部端子１４４２は、絶縁キャップ本体１４３１Ａに設置される。図９に示すように、中間接続部１４４２１は、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２の間に配置されて、薄肉部１４３１１の面１４３１１ａと接触する。外部接続部１４４２２は、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２のＹ－方向を向いた面と接触する。外部接続部１４４２２の接続面１４４２２ａは、金属ケース１４１の外部に露出する。外部接続部１４４２２の接続面１４４２２ａは、金属ケース型二次セル１４のＹ方向（Ｙ－方向）の端部に配置される。 As shown in FIGS. 6, 8, and 9, the external terminal 1442 is installed on the insulating cap body 1431A. As shown in FIG. 9, the intermediate connection portion 14421 is disposed between the pair of thick portions 14312 and 14312 of the insulating cap main body 1431 </ b> A and contacts the surface 14311 a of the thin portion 14311. The external connection portion 14422 contacts the surface of the pair of thick portions 14312 and 14312 of the insulating cap main body 1431A facing in the Y-direction. A connection surface 14422 a of the external connection portion 14422 is exposed to the outside of the metal case 141. The connection surface 14422a of the external connection portion 14422 is disposed at the end of the metal case type secondary cell 14 in the Y direction (Y-direction).
　外部端子１４４２は、絶縁キャップ本体１４３１Ａに取り付けられる。外部端子１４４２は、図７に示すネジ２６を用いて、絶縁キャップ本体１４３１Ａにねじ止めされる。ねじ止めの具体的な手順は、以下のとおりである。 External terminal 1442 is attached to insulating cap body 1431A. The external terminal 1442 is screwed to the insulating cap body 1431A using the screw 26 shown in FIG. The specific procedure for screwing is as follows.
　外部端子１４４２の中間接続部１４４２１が、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２の間に、Ｙ方向に挿し込まれる（図９参照）。外部端子１４４２の外部接続部１４４２２が１対の厚肉部１４３１２、１４３１２に接触するまで、挿し込まれる。そして、外部接続部１４４２２の外部接続部１４４２２が、図７に示すネジ２６を用いて、絶縁キャップ本体１４３１Ａの１対の厚肉部１４３１２、１４３１２にねじ止めされる。 The intermediate connection portion 14421 of the external terminal 1442 is inserted in the Y direction between the pair of thick portions 14312 and 14312 of the insulating cap body 1431A (see FIG. 9). The external terminal 1442 is inserted until the external connection portion 14422 contacts the pair of thick portions 14312 and 14312. Then, the external connection portion 14422 of the external connection portion 14422 is screwed to the pair of thick portions 14312 and 14312 of the insulating cap body 1431A using the screw 26 shown in FIG.
　図９に示すように、外部端子１４４２の中間接続部１４４２１は、リードタブ１４４１の一部に対して、Ｘ方向に面接触する。外部端子１４４２の中間接続部１４４２１は、リードタブ１４４１に接続されている。具体的には、溶接によって接着されている。 As shown in FIG. 9, the intermediate connection portion 14421 of the external terminal 1442 is in surface contact with a part of the lead tab 1441 in the X direction. An intermediate connection portion 14421 of the external terminal 1442 is connected to the lead tab 1441. Specifically, it is bonded by welding.
　外部端子１４４２と同様に、外部端子１４５２は、中間接続部１４５２１と、外部接続部１４５２２とを有する。外部接続部１４４２２と同様に、外部接続部１４５２２は、接続面１４５２２ａを有する。接続面１４４２２ａと同様に、接続面１４５２２ａは、金属ケース１４１の外部に露出する。接続面１４５２２ａは、金属ケース型二次セル１４のＹ方向（Ｙ＋方向）の端部に配置される。接続面１４５２２ａは、本発明の実施形態の接続面１４５ａの一例である。外部端子１４５２は、図７に示すネジ２６を用いて、絶縁キャップ本体１４３１Ｂにねじ止めされる。外部端子１４４２と同様に、外部端子１４５２の中間接続部１４５２１は、リードタブ１４５１に接続されている。 Similarly to the external terminal 1442, the external terminal 1452 has an intermediate connection portion 14521 and an external connection portion 14522. Similar to the external connection portion 14422, the external connection portion 14522 has a connection surface 14522a. Similar to the connection surface 14422a, the connection surface 14522a is exposed to the outside of the metal case 141. The connection surface 14522a is disposed at the end of the metal case type secondary cell 14 in the Y direction (Y + direction). The connection surface 14522a is an example of the connection surface 145a according to the embodiment of the present invention. The external terminal 1452 is screwed to the insulating cap body 1431B using the screw 26 shown in FIG. Similar to the external terminal 1442, the intermediate connection portion 14521 of the external terminal 1452 is connected to the lead tab 1451.
　（１０）複数の金属ケース型二次セル１４の積層構造
　上述したように、複数の金属ケース型二次セル１４は、Ｘ方向に積層されている。上述したように、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の向きは、Ｘ方向の軸回りに１８０°異なる。したがって、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有するセル端子１４４は、他方が有するセル端子１４５とＸ方向に隣り合う。これは、複数の金属ケース型二次セル１４のうち、Ｘ方向に隣り合ういずれの２つの金属ケース型二次セル１４にも当てはまる。 (10) Laminated structure of the plurality of metal case type secondary cells 14 As described above, the plurality of metal case type secondary cells 14 are laminated in the X direction. As described above, the directions of the two metal case type secondary cells 14 adjacent to each other in the X direction are different by 180 ° around the axis in the X direction. Therefore, the cell terminal 144 included in one of the two metal case-type secondary cells 14 adjacent in the X direction is adjacent to the cell terminal 145 included in the other in the X direction. This applies to any two metal case type secondary cells 14 adjacent in the X direction among the plurality of metal case type secondary cells 14.
　Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有する絶縁キャップ部１４３は、他方が有する絶縁キャップ部１４３に対してＸ方向に接触する。Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有する絶縁キャップ１４３Ａは、他方が有する絶縁キャップ１４３Ｂに対してＸ方向に接触する。これは、複数の金属ケース型二次セル１４のうち、Ｘ方向に隣り合ういずれの２つの金属ケース型二次セル１４にも当てはまる。 The insulating cap part 143 included in one of the two metal case type secondary cells 14 adjacent in the X direction is in contact with the insulating cap part 143 included in the other in the X direction. The insulating cap 143A included in one of the two metal case-type secondary cells 14 adjacent in the X direction is in contact with the insulating cap 143B included in the other in the X direction. This applies to any two metal case type secondary cells 14 adjacent in the X direction among the plurality of metal case type secondary cells 14.
　図１６に示すように、Ｘ方向に隣り合う２つの絶縁キャップ部１４３の一方が有する少なくとも１つの凸部１４３１２ｃは、他方が有する少なくとも１つの凹部１４３１２ｄに嵌め込まれる。これは、複数の金属ケース型二次セル１４が有する複数の絶縁キャップ部１４３のうち、Ｘ方向に隣り合ういずれの２つの絶縁キャップ部１４３にも当てはまる。Ｘ方向に隣り合う２つの絶縁キャップ部１４３の一方が有する４つの凸部１４３１２ｃは、他方の絶縁キャップ部１４３が有する４つの凹部１４３１２ｄに嵌め込まれている。つまり、絶縁キャップ１４３Ａが有する１対の凸部１４３１２ｃ、１４３１２ｃは、絶縁キャップ１４３ＡとＸ方向に隣り合う絶縁キャップ１４３Ｂが有する１対の凹部１４３１２ｄ、１４３１２ｄに嵌め込まれている。それにより、複数の金属ケース型二次セル１４がＹ方向およびＺ方向に位置ずれするのを防止できる。 As shown in FIG. 16, at least one convex portion 14312c included in one of two insulating cap portions 143 adjacent in the X direction is fitted into at least one concave portion 14312d included in the other. This applies to any two insulating cap portions 143 adjacent in the X direction among the plurality of insulating cap portions 143 included in the plurality of metal case type secondary cells 14. Four convex portions 14312c included in one of the two insulating cap portions 143 adjacent in the X direction are fitted into four concave portions 14312d included in the other insulating cap portion 143. That is, the pair of convex portions 14312c and 14312c included in the insulating cap 143A is fitted into the pair of concave portions 14312d and 14312d included in the insulating cap 143B adjacent to the insulating cap 143A in the X direction. Thereby, it is possible to prevent the plurality of metal case-type secondary cells 14 from being displaced in the Y direction and the Z direction.
　上述したように、凹部１４３１２ｄのＸ方向の長さ（深さ）は、凸部１４３１２ｃのＸ方向の長さよりも小さい。そのため、Ｘ方向に隣り合う２つの絶縁キャップ部１４３の接触箇所は、４つの凸部１４３１２ｃと４つの凹部１４３１２ｄだけである。 As described above, the length (depth) of the concave portion 14312d in the X direction is smaller than the length of the convex portion 14312c in the X direction. Therefore, the contact portions of the two insulating cap portions 143 adjacent in the X direction are only the four convex portions 14312c and the four concave portions 14312d.
　図１６に示すように、複数の金属ケース型二次セル１４の各々が有する絶縁キャップ部１４３に形成された少なくとも１つの貫通孔１４３１２ｅに、ボルト１６（軸部材）が挿入されている。貫通孔１４３１２ｅは、凸部１４３１２ｃと凹部１４３１２ｄを通る位置に形成されている。図３、図４および図５に示すように、複数の金属ケース型二次セル１４の各々が有する絶縁キャップ部１４３に形成された４つの貫通孔１４３１２ｅに、それぞれ、ボルト１６が挿入されている。それにより、複数の金属ケース型二次セル１４がＹ方向およびＺ方向に位置ずれするのを防止できる。各ボルト１６の先端には、ナット１８が取り付けられている。それにより、複数の金属ケース型二次セル１４は固定される。よって、複数の金属ケース型二次セル１４を一体的に取り扱うことができる。 As shown in FIG. 16, a bolt 16 (shaft member) is inserted into at least one through-hole 14312e formed in the insulating cap portion 143 included in each of the plurality of metal case type secondary cells 14. The through hole 14312e is formed at a position passing through the convex portion 14312c and the concave portion 14312d. As shown in FIGS. 3, 4, and 5, bolts 16 are respectively inserted into four through holes 14312 e formed in the insulating cap portion 143 included in each of the plurality of metal case type secondary cells 14. . Thereby, it is possible to prevent the plurality of metal case-type secondary cells 14 from being displaced in the Y direction and the Z direction. A nut 18 is attached to the tip of each bolt 16. Thereby, the plurality of metal case type secondary cells 14 are fixed. Therefore, a plurality of metal case type secondary cells 14 can be handled integrally.
　図３、図４および図５に示すように、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有する金属ケース１４１は、他方が有する金属ケース１４１に対してＸ方向に離れている。これは、複数の金属ケース型二次セル１４が有する複数の金属ケース１４１のうち、Ｘ方向に隣り合ういずれの２つの金属ケース１４１にも当てはまる。組電池１０を使用する際、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の隙間が鉛直方向に延びるように、組電池１０を配置することが好ましい。これにより、複数の金属ケース型二次セル１４の各々の放熱性が向上する。 As shown in FIGS. 3, 4, and 5, the metal case 141 included in one of the two metal case-type secondary cells 14 adjacent in the X direction is separated from the metal case 141 included in the other in the X direction. Yes. This applies to any two metal cases 141 adjacent to each other in the X direction among the plurality of metal cases 141 included in the plurality of metal case type secondary cells 14. When using the assembled battery 10, it is preferable to arrange the assembled battery 10 so that a gap between two metal case-type secondary cells 14 adjacent in the X direction extends in the vertical direction. Thereby, the heat dissipation of each of the plurality of metal case type secondary cells 14 is improved.
　（１１）複数の金属ケース型二次セル１４の電気的接続構造
　複数の金属ケース型二次セル１４は、電気的に直列に接続されている。以下、詳細に説明する。図３に示すように、複数の金属ケース型二次セル１４のうち、Ｘ＋方向の端に配置された金属ケース型二次セル１４が有する絶縁キャップ本体１４３１Ａは、Ｙ－方向側にある。したがって、複数の金属ケース型二次セル１４のうち、Ｘ＋方向の端に配置された金属ケース型二次セル１４が有するセル端子１４４も、Ｙ－方向側にある。複数の金属ケース型二次セル１４のうち、Ｘ＋方向の端に配置された金属ケース型二次セル１４が有するセル端子１４４は、バスバー１９に電気的に接続されている。バスバー１９は、セル端子１４４の接続面１４４２２ａに接触している。この接続面１４４２２ａは、Ｙ－方向を向いている。バスバー１９は、外部端子１４４２を絶縁キャップ本体１４３１Ａに取り付けるネジ２６を利用して、外部端子１４４２に取り付けられる。バスバー１９は、銅を含む金属材料で形成されている。 (11) Electrical connection structure of multiple metal case type secondary cells 14 The multiple metal case type secondary cells 14 are electrically connected in series. Details will be described below. As shown in FIG. 3, among the plurality of metal case type secondary cells 14, the insulating cap main body 1431A of the metal case type secondary cell 14 disposed at the end in the X + direction is on the Y-direction side. Accordingly, among the plurality of metal case type secondary cells 14, the cell terminal 144 of the metal case type secondary cell 14 disposed at the end in the X + direction is also on the Y-direction side. Among the plurality of metal case type secondary cells 14, the cell terminals 144 of the metal case type secondary cells 14 arranged at the end in the X + direction are electrically connected to the bus bar 19. The bus bar 19 is in contact with the connection surface 14422a of the cell terminal 144. The connection surface 14422a faces the Y-direction. The bus bar 19 is attached to the external terminal 1442 using a screw 26 that attaches the external terminal 1442 to the insulating cap body 1431A. The bus bar 19 is formed of a metal material containing copper.
　図４に示すように、バスバー１９は、Ｚ方向に見てＬ字状の板形状である。バスバー１９は、Ｙ－方向に突出する母線接続部１９ａを有する。母線接続部１９ａは、負極母線２２に接続されている。母線接続部１９ａは、例えば溶接によって負極母線２２に接着されている。負極母線２２は、組電池端子１２に電気的に接続されている。 As shown in FIG. 4, the bus bar 19 has an L-shaped plate shape when viewed in the Z direction. The bus bar 19 has a busbar connection portion 19a protruding in the Y-direction. The bus connection part 19 a is connected to the negative electrode bus 22. The bus bar connecting portion 19a is bonded to the negative electrode bus bar 22 by welding, for example. The negative electrode bus 22 is electrically connected to the assembled battery terminal 12.
　図３に示すように、複数の金属ケース型二次セル１４のうち、Ｘ－方向の端に配置された金属ケース型二次セル１４が有する絶縁キャップ本体１４３１Ｂは、Ｙ＋方向側にある。したがって、複数の金属ケース型二次セル１４のうち、Ｘ－方向の端に配置された金属ケース型二次セル１４が有するセル端子１４５も、Ｙ＋方向側にある。複数の金属ケース型二次セル１４のうち、Ｘ―方向の端に配置された金属ケース型二次セル１４が有するセル端子１４５は、バスバー２１に電気的に接続されている。バスバー２１は、セル端子１４５の接続面１４５２２ａに接触している。この接続面１４５２２ａは、Ｙ＋方向を向いている。バスバー２１は、外部端子１４５２を絶縁キャップ本体１４３１Ｂに取り付けるネジ２６を利用して、外部端子１４５２に取り付けられる。バスバー２１は、アルミニウムを含む金属材料で形成されている。 As shown in FIG. 3, among the plurality of metal case type secondary cells 14, the insulating cap body 1431B of the metal case type secondary cell 14 disposed at the end in the X-direction is on the Y + direction side. Therefore, among the plurality of metal case type secondary cells 14, the cell terminal 145 of the metal case type secondary cell 14 disposed at the end in the X-direction is also on the Y + direction side. Among the plurality of metal case type secondary cells 14, the cell terminals 145 of the metal case type secondary cells 14 arranged at the end in the X-direction are electrically connected to the bus bar 21. The bus bar 21 is in contact with the connection surface 14522a of the cell terminal 145. The connection surface 14522a faces the Y + direction. The bus bar 21 is attached to the external terminal 1452 using a screw 26 that attaches the external terminal 1452 to the insulating cap body 1431B. Bus bar 21 is formed of a metal material containing aluminum.
　図５に示すように、バスバー２１は、Ｚ方向に見てＬ字状の板形状である。バスバー２１は、Ｙ＋方向に突出する母線接続部２１ａを有する。母線接続部２１ａは、正極母線２３に接続されている。母線接続部２１ａは、例えば溶接によって正極母線２３に接着されている。正極母線２３は、組電池端子１３に電気的に接続されている。 As shown in FIG. 5, the bus bar 21 has an L-shaped plate shape when viewed in the Z direction. The bus bar 21 has a busbar connection portion 21a protruding in the Y + direction. The bus connection part 21 a is connected to the positive electrode bus 23. The bus bar connecting portion 21a is bonded to the positive electrode bus bar 23 by welding, for example. The positive electrode bus 23 is electrically connected to the assembled battery terminal 13.
　図３、図４および図５に示すように、複数の金属ケース型二次セル１４が有する複数のセル端子１４４のうち、バスバー１９に接続されたセル端子１４４以外のセル端子１４４は、それぞれ、バスバー２０に電気的に接続されている。複数の金属ケース型二次セル１４が有する複数のセル端子１４５のうち、バスバー２１に接続されたセル端子１４５以外のセル端子１４５は、それぞれ、バスバー２０に電気的に接続されている。各バスバー２０は、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有するセル端子１４４と、他方が有するセル端子１４５に接続される。各バスバー２０は、Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有するセル端子１４４の接続面１４４２２ａと、他方が有するセル端子１４５の接続面１４５２２ａに接触している。複数の金属ケース型二次セル１４は、バスバー２０によって電気的に直列に接続されている。 As shown in FIGS. 3, 4, and 5, among the plurality of cell terminals 144 included in the plurality of metal case-type secondary cells 14, the cell terminals 144 other than the cell terminals 144 connected to the bus bar 19 are respectively It is electrically connected to the bus bar 20. Among the plurality of cell terminals 145 included in the plurality of metal case-type secondary cells 14, the cell terminals 145 other than the cell terminals 145 connected to the bus bar 21 are electrically connected to the bus bar 20. Each bus bar 20 is connected to a cell terminal 144 included in one of the two metal case-type secondary cells 14 adjacent in the X direction and a cell terminal 145 included in the other. Each bus bar 20 is in contact with the connection surface 14422a of the cell terminal 144 included in one of the two metal case-type secondary cells 14 adjacent in the X direction and the connection surface 14522a of the cell terminal 145 included in the other. The plurality of metal case type secondary cells 14 are electrically connected in series by a bus bar 20.
　複数のバスバー２０は、同じ形状および大きさを有する。各バスバー２０は、矩形の平坦な板形状である。各バスバー２０は、外部端子１４４２を絶縁キャップ本体１４３１Ａに取り付けるネジ２６を利用して、外部端子１４４２に取り付けられる。各バスバー２０は、外部端子１４５２を絶縁キャップ本体１４３１Ｂに取り付けるネジ２６を利用して、外部端子１４５２に取り付けられる。 The plurality of bus bars 20 have the same shape and size. Each bus bar 20 has a rectangular flat plate shape. Each bus bar 20 is attached to the external terminal 1442 using a screw 26 for attaching the external terminal 1442 to the insulating cap main body 1431A. Each bus bar 20 is attached to the external terminal 1452 using a screw 26 for attaching the external terminal 1452 to the insulating cap body 1431B.
　複数のバスバー２０は、互いに同じ材質で形成されている。各バスバー２０の材質は、外部端子１４４２の接続面１４４２２ａに接続される部分と、外部端子１４５２の接続面１４５２２ａに接続される部分とで、異なっている。バスバー２０のうち、外部端子１４４２の接続面１４４２２ａに接続される部分は、銅を含む金属材料で形成されている。バスバー２０のうち、外部端子１４５２の接続面１４５２２ａに接続される部分は、アルミニウムを含む金属材料で形成されている。 The plurality of bus bars 20 are formed of the same material. The material of each bus bar 20 is different between a portion connected to the connection surface 14422 a of the external terminal 1442 and a portion connected to the connection surface 14522 a of the external terminal 1452. A portion of the bus bar 20 that is connected to the connection surface 14422a of the external terminal 1442 is formed of a metal material containing copper. A portion of the bus bar 20 that is connected to the connection surface 14522a of the external terminal 1452 is formed of a metal material containing aluminum.
　本発明の実施形態の具体例は、上述した本発明の実施形態の効果に加えて、以下の効果を奏する。 The specific example of the embodiment of the present invention has the following effect in addition to the effect of the embodiment of the present invention described above.
　内側ケース１４２は、金属ケース１４１の内面１４１１１ａと面接触している。その一方、内側ケース１４２は、金属ケース１４１の内面１４１２１ａと向かい合う内面１４１２１ａから離れている。内側ケース１４２と金属ケース１４１の内面１４１２１ａとの間に隙間があることによって、金属ケース型二次セル１４の充放電に起因する内側ケース１４２の膨張を許容できる。内側ケース１４２の膨張は、例えば、初期の内側ケース１４２の容積の１０％程度までは許容される。 The inner case 142 is in surface contact with the inner surface 14111a of the metal case 141. On the other hand, the inner case 142 is separated from the inner surface 14121a facing the inner surface 14121a of the metal case 141. Since there is a gap between the inner case 142 and the inner surface 14121a of the metal case 141, expansion of the inner case 142 due to charging / discharging of the metal case type secondary cell 14 can be allowed. Expansion of the inner case 142 is allowed, for example, up to about 10% of the volume of the initial inner case 142.
　Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有する金属ケース１４１は、他方が有する金属ケース１４１に対してＸ方向に離れている。この構成により、隣り合う２つの金属ケース型二次セル１４の一方が有する金属ケース１４１が、他方が有する金属ケース１４１に接触している場合と比べて、金属ケース型二次セル１４の充放電によって発生する熱をさらに逃がし易くなる。その結果、組電池１０を大電流で充放電することによる温度上昇をより抑制することができる。 The metal case 141 included in one of the two metal case type secondary cells 14 adjacent in the X direction is separated from the metal case 141 included in the other in the X direction. With this configuration, compared to the case where the metal case 141 included in one of the two adjacent metal case-type secondary cells 14 is in contact with the metal case 141 included in the other, the charging / discharging of the metal case-type secondary cell 14 is performed. This makes it easier to release the heat generated by. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
　Ｘ方向に隣り合う２つの金属ケース型二次セル１４の一方が有する絶縁キャップ部１４３は、他方が有する絶縁キャップ部１４３に対してＸ方向に接触している。この構成により、金属ケース１４１同士の間に隙間を確保しつつ、複数の金属ケース型二次セル１４を、１対の電極シート１４６、１４７の積層方向（Ｘ方向）に積層しやすい。金属ケース１４１同士の間に隙間を確保することによって、金属ケース１４１同士が接触している場合に比べて、金属ケース型二次セル１４の充放電によって発生する熱をさらに逃がし易くなる。その結果、組電池１０を大電流で充放電することによる温度上昇をより抑制することができる。 The insulating cap part 143 included in one of the two metal case-type secondary cells 14 adjacent in the X direction is in contact with the insulating cap part 143 included in the other in the X direction. With this configuration, it is easy to stack the plurality of metal case type secondary cells 14 in the stacking direction (X direction) of the pair of electrode sheets 146 and 147 while securing a gap between the metal cases 141. By securing a gap between the metal cases 141, heat generated by charging and discharging of the metal case secondary cells 14 can be more easily released as compared to the case where the metal cases 141 are in contact with each other. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
　Ｘ方向に隣り合う２つの絶縁キャップ部１４３の一方が有する少なくとも１つの凸部１４３１２ｃが、他方が有する少なくとも１つの凹部１４３１２ｄに嵌め込まれている。この構成により、複数の金属ケース型二次セル１４が、１対の電極シート１４６、１４７の積層方向（Ｘ方向）に垂直な方向に位置ずれするのを防止できる。よって、複数の金属ケース型二次セル１４を、Ｘ方向により容易に積層できる。また、金属ケース１４１同士の間に隙間を確保する構成をより容易に実現できる。 At least one convex portion 14312c included in one of the two insulating cap portions 143 adjacent in the X direction is fitted into at least one concave portion 14312d included in the other. With this configuration, the plurality of metal case type secondary cells 14 can be prevented from being displaced in a direction perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. Therefore, the plurality of metal case type secondary cells 14 can be easily stacked in the X direction. Moreover, the structure which ensures a clearance gap between metal cases 141 can be implement | achieved more easily.
　複数の金属ケース型二次セル１４の各々が有する１対のセル端子１４４、１４５は、１対の電極シート１４６、１４７の積層方向（Ｘ方向）に垂直な方向において１対の平坦な電極シート１４６、１４７の両側に配置されている。この構成により、１対のセル端子１４４、１４５が、Ｘ方向に垂直な方向において１対の平坦な電極シート１４６、１４７の片側に配置されている場合、もしくは、１対のセル端子１４４、１４５が、１対の電極シート１４６、１４７と、Ｘ方向に並んで配置されている場合に比べて、複数の金属ケース型二次セル１４を直列または並列に接続するための接続部品（１９～２３）の構造を簡易化できる。接続部品の構造がシンプルであることにより、接続部品は、複数の金属ケース型二次セル１４の放熱をできるだけ妨げない構造にできる。その結果、組電池１０を大電流で充放電することによる温度上昇をより抑制することができる。 The pair of cell terminals 144 and 145 included in each of the plurality of metal case type secondary cells 14 is a pair of flat electrode sheets in a direction perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. 146 and 147 are arranged on both sides. With this configuration, the pair of cell terminals 144 and 145 is disposed on one side of the pair of flat electrode sheets 146 and 147 in the direction perpendicular to the X direction, or the pair of cell terminals 144 and 145. However, as compared with a case where a pair of electrode sheets 146 and 147 are arranged side by side in the X direction, connection parts (19 to 23) for connecting a plurality of metal case type secondary cells 14 in series or in parallel. ) Can be simplified. Since the structure of the connecting part is simple, the connecting part can have a structure that does not disturb the heat dissipation of the plurality of metal case type secondary cells 14 as much as possible. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
　複数の金属ケース型二次セル１４の各々が有する１対のセル端子１４４、１４５の１対の接続面１４４２２ａ、１４５２２ａは、１対の電極シート１４６、１４７の積層方向（Ｘ方向）に垂直な方向を向いている。仮に、１対の接続面１４４２２ａ、１４５２２ａが、Ｘ方向を向いている場合、複数の金属ケース型二次セル１４を直列に接続するための接続部品が不要になるか、この接続部品の構造をシンプルにできる。しかし、複数の金属ケース型二次セル１４を並列に接続するための接続部品の構造が複雑になる。したがって、１対の接続面１４４２２ａ、１４５２２ａが、Ｘ方向に垂直な方向を向いていることにより、複数の金属ケース型二次セル１４が直列と並列のいずれに接続される場合でも、複数の金属ケース型二次セル１４を接続するための接続部品（１９～２３）の構造を簡易化できる。接続部品の構造がシンプルであることにより、接続部品は、複数の金属ケース型二次セル１４の放熱をできるだけ妨げない構造にできる。その結果、組電池１０を大電流で充放電することによる温度上昇をより抑制することができる。 A pair of connection surfaces 14422a and 14522a of a pair of cell terminals 144 and 145 included in each of the plurality of metal case type secondary cells 14 is perpendicular to the stacking direction (X direction) of the pair of electrode sheets 146 and 147. Facing the direction. If the pair of connection surfaces 14422a and 14522a face the X direction, a connection component for connecting the plurality of metal case type secondary cells 14 in series is unnecessary, or the structure of this connection component is Can be simple. However, the structure of the connection component for connecting the plurality of metal case type secondary cells 14 in parallel becomes complicated. Therefore, since the pair of connection surfaces 14422a and 14522a are oriented in the direction perpendicular to the X direction, a plurality of metal case-type secondary cells 14 can be connected in series or in parallel. The structure of the connection parts (19 to 23) for connecting the case type secondary cell 14 can be simplified. Since the structure of the connecting part is simple, the connecting part can have a structure that does not disturb the heat dissipation of the plurality of metal case type secondary cells 14 as much as possible. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
　１対のセル端子１４４、１４５は、１対のリードタブ１４４１、１４５１と、１対のリードタブ１４４１、１４５１と別部材である１対の外部端子１４４２、１４５２とを有する。そのため、１対のセル端子１４４、１４５の設計自由度を向上できる。よって、金属ケース型二次セル１４は、充放電によって発生する熱をさらに逃がし易い構造にできる。その結果、組電池１０を大電流で充放電することによる温度上昇をより抑制することができる。 The pair of cell terminals 144 and 145 include a pair of lead tabs 1441 and 1451, a pair of lead tabs 1441 and 1451, and a pair of external terminals 1442 and 1452 which are separate members. Therefore, the design freedom of the pair of cell terminals 144 and 145 can be improved. Therefore, the metal case type secondary cell 14 can have a structure in which heat generated by charging and discharging is more easily released. As a result, the temperature rise caused by charging / discharging the assembled battery 10 with a large current can be further suppressed.
　金属ケース型二次セル１４は、本願の基礎出願（特願２０１６－２４３０１０）の扁平缶電池１４に相当する。金属ケース１４１は、基礎出願の外側ケース１４１のうち、絶縁ケース部１４１３Ａ、１４１３Ｂと、ターミナル１４１４Ａ、１４１４Ｂと、カバー１４１５Ａ、１４１５Ｂを除く部分に相当する。金属ケース部品１４１１、１４１２は、基礎出願の金属ケース部１４１１、１４１２に相当する。主板部１４１１１と側板部１４１１２は、基礎出願の平板１４１１１と側板１４１１２にそれぞれ相当する。主板部１４１２１と側板部１４１２２は、基礎出願の平板１４１２１と側板１４１２２にそれぞれ相当する。絶縁キャップ本体１４３１Ａ、１４３１Ｂは、基礎出願の絶縁ケース部１４１３Ａ、１４１３Ｂにそれぞれ相当する。薄肉部１４３１１と厚肉部１４３１２は、基礎出願の平板１４１３１と側部１４１３２にそれぞれ相当する。絶縁カバー１４３２Ａ、１４３２Ｂは、基礎出願のカバー１４１５Ａ、１４１５Ｂにそれぞれ相当する。主板部１４３２１と側板部１４３２２は、基礎出願の平板１４１５１と側部１４１５２にそれぞれ相当する。外部端子１４４２、１４５２は、基礎出願のターミナル１４１４Ａ、１４１４Ｂにそれぞれ相当する。中間接続部１４４２１、１４５２１は、いずれも基礎出願の平板１４１４１に相当し、外部接続部１４４２２、１４５２２は、いずれも基礎出願の側壁１４１４２に相当する。レイアウト上、電極シート１４６は基礎出願の電極１４２１に相当し、電極シート１４７は、基礎出願の電極１４２２に相当する。但し、本願では、電極シート１４６が負極であるのに対して、基礎出願の電極１４２１は正極である。負極シート１４６の材質の説明の一部は、基礎出願に負極１４２２の材質として記載されており、正極シート１４７の材質の説明の一部は、基礎出願に正極１４２１の材質として記載されている。レイアウト上、リードタブ１４４１は、基礎出願の正極端子１４２１１に相当し、リードタブ１４５１は、基礎出願の負極端子１４２２１に相当する。セパレータ１４８Ｃ、１４８Ｂ、１４８Ａは、基礎出願のセパレータ１４２３、１４２４、１４２５にそれぞれ相当する。電解質１４９は、基礎出願の電解液１４２６に相当する。基礎出願の図７は、扁平缶電池１４の模式的な断面図であって、本願の図９に相当する。基礎出願の図７のカバー１４１５Ａは、本願の図９の絶縁カバー１４３２Ａよりも、紙面左右方向長さが短く表示されている。しかし、基礎出願の図７は、模式的に表示された図面であって、本願の絶縁カバー１４３２Ａの長さが、基礎出願のカバー１４１５Ａと長さが違うわけではない。 The metal case type secondary cell 14 corresponds to the flat can battery 14 of the basic application (Japanese Patent Application No. 2016-243010) of the present application. The metal case 141 corresponds to a portion of the outer case 141 of the basic application excluding the insulating case portions 1413A and 1413B, the terminals 1414A and 1414B, and the covers 1415A and 1415B. The metal case parts 1411 and 1412 correspond to the metal case parts 1411 and 1412 of the basic application. The main plate portion 14111 and the side plate portion 14112 correspond to the flat plate 14111 and the side plate 14112 of the basic application, respectively. The main plate portion 14121 and the side plate portion 14122 correspond to the flat plate 14121 and the side plate 14122 of the basic application, respectively. The insulating cap bodies 1431A and 1431B correspond to the insulating case portions 1413A and 1413B of the basic application, respectively. The thin portion 14311 and the thick portion 14312 correspond to the flat plate 14131 and the side portion 14132 of the basic application, respectively. The insulating covers 1432A and 1432B correspond to the covers 1415A and 1415B of the basic application, respectively. The main plate portion 14321 and the side plate portion 14322 correspond to the flat plate 14151 and the side portion 14152 of the basic application, respectively. The external terminals 1442 and 1452 correspond to the terminals 1414A and 1414B of the basic application, respectively. The intermediate connection parts 14421 and 14521 all correspond to the flat plate 14141 of the basic application, and the external connection parts 14422 and 14522 all correspond to the side wall 14142 of the basic application. In terms of layout, the electrode sheet 146 corresponds to the electrode 1421 of the basic application, and the electrode sheet 147 corresponds to the electrode 1422 of the basic application. However, in the present application, the electrode sheet 146 is a negative electrode, whereas the electrode 1421 of the basic application is a positive electrode. Part of the description of the material of the negative electrode sheet 146 is described as the material of the negative electrode 1422 in the basic application, and part of the description of the material of the positive electrode sheet 147 is described as the material of the positive electrode 1421 in the basic application. In the layout, the lead tab 1441 corresponds to the positive terminal 14211 of the basic application, and the lead tab 1451 corresponds to the negative terminal 14221 of the basic application. The separators 148C, 148B, and 148A correspond to the separators 1423, 1424, and 1425 of the basic application, respectively. The electrolyte 149 corresponds to the electrolyte solution 1426 of the basic application. FIG. 7 of the basic application is a schematic cross-sectional view of the flat can battery 14 and corresponds to FIG. 9 of the present application. The cover 1415A of FIG. 7 of the basic application is displayed with a shorter length in the left-right direction on the paper surface than the insulating cover 1432A of FIG. 9 of the present application. However, FIG. 7 of the basic application is a diagram schematically displayed, and the length of the insulating cover 1432A of the present application is not different from the length of the cover 1415A of the basic application.
　＜本発明の実施形態の変更例＞
　以上、本発明の実施の形態について詳述してきたが、これらはあくまでも例示であって、本発明は、上述の実施の形態によって何ら限定されない。本発明は、特許請求の範囲に記載した限りにおいて様々な変更が可能である。以下、本発明の実施形態の変更例について説明する。なお、上述した構成と同じ構成を有するものについては、同じ符号を用いて適宜その説明を省略する。後述する変更例は、適宜組み合わせて実施可能である。 <Modification of Embodiment of the Present Invention>
As mentioned above, although embodiment of this invention has been explained in full detail, these are illustrations to the last and this invention is not limited at all by the above-mentioned embodiment. The present invention can be variously modified as long as it is described in the claims. Hereinafter, a modified example of the embodiment of the present invention will be described. In addition, about what has the same structure as the structure mentioned above, the description is abbreviate | omitted suitably using the same code | symbol. Modification examples to be described later can be implemented in combination as appropriate.
　（１）複数の金属ケース型二次セルの電気的接続構造についての変更例
　上述の実施形態の具体例において、複数の金属ケース型二次セル１４は、電気的に直列に接続されている。しかし、本発明において、複数の金属ケース型二次セルは、電気的に並列に接続されてもよい。 (1) Modified example of electrical connection structure of a plurality of metal case type secondary cells In the specific example of the above-described embodiment, the plurality of metal case type secondary cells 14 are electrically connected in series. However, in the present invention, the plurality of metal case type secondary cells may be electrically connected in parallel.
　図１７は、上述の実施形態の具体例の複数の金属ケース型二次セル１４を、並列に接続した一例である。図１７において、複数の金属ケース型二次セル１４が有する複数の絶縁キャップ１４３Ａは、金属ケース型二次セル１４の積層方向に積層される。複数の金属ケース型二次セル１４が有する複数の絶縁キャップ１４３Ｂも、金属ケース型二次セル１４の積層方向に積層される。隣り合う２つの金属ケース型二次セル１４の絶縁キャップ１４３Ａ同士は、接触している。隣り合う２つの金属ケース型二次セル１４の絶縁キャップ１４３Ｂ同士も、接触している。複数の金属ケース型二次セル１４が有する複数のセル端子１４４は、金属ケース型二次セル１４の積層方向に並んでいる。複数の金属ケース型二次セル１４が有する複数のセル端子１４５も、金属ケース型二次セル１４の積層方向に並んでいる。複数の金属ケース型二次セル１４が有する複数のセル端子１４４は、１つのバスバー２０１に接続されている。複数の金属ケース型二次セル１４が有する複数のセル端子１４５は、１つのバスバー２０２に接続されている。バスバー２０１は、複数のセル端子１４４の接続面１４４２２ａに接触しており、バスバー２０２は、複数のセル端子１４５の接続面１４５２２ａに接触している。バスバー２０１は、図示しない負極母線に接続され、バスバー２０２は、図示しない正極母線に接続される。 FIG. 17 is an example in which a plurality of metal case type secondary cells 14 of a specific example of the above-described embodiment are connected in parallel. In FIG. 17, the plurality of insulating caps 143 </ b> A included in the plurality of metal case type secondary cells 14 are stacked in the stacking direction of the metal case type secondary cells 14. The plurality of insulating caps 143 </ b> B included in the plurality of metal case type secondary cells 14 are also stacked in the stacking direction of the metal case type secondary cells 14. The insulating caps 143A of the two adjacent metal case type secondary cells 14 are in contact with each other. The insulating caps 143B of the two adjacent metal case type secondary cells 14 are also in contact with each other. The plurality of cell terminals 144 included in the plurality of metal case type secondary cells 14 are arranged in the stacking direction of the metal case type secondary cells 14. The plurality of cell terminals 145 included in the plurality of metal case type secondary cells 14 are also arranged in the stacking direction of the metal case type secondary cells 14. A plurality of cell terminals 144 included in the plurality of metal case type secondary cells 14 are connected to one bus bar 201. A plurality of cell terminals 145 included in the plurality of metal case type secondary cells 14 are connected to one bus bar 202. The bus bar 201 is in contact with the connection surfaces 14422a of the plurality of cell terminals 144, and the bus bar 202 is in contact with the connection surfaces 14522a of the plurality of cell terminals 145. Bus bar 201 is connected to a negative bus (not shown), and bus bar 202 is connected to a positive bus (not shown).
　上述の実施形態の具体例のバスバー１９、２０、２１および図１７に示すバスバー２０１、２０２は、絶縁材料で形成された保護部材で保護されていてもよい。保護部材は、フィルム状であってもよいし、板状であってもよい。 The bus bars 19, 20, 21 of the specific example of the above-described embodiment and the bus bars 201, 202 shown in FIG. 17 may be protected by a protective member formed of an insulating material. The protective member may be in the form of a film or plate.
　（２）複数の金属ケース型二次セルの積層構造についての変更例
　上述の実施形態の具体例において、複数の金属ケース型二次セル１４は、ボルト１６およびナット１８によって固定されている。しかし、複数の金属ケース型二次セルを積層状態で固定する手段は、ボルトとナットに限定されない。例えば、ゴムバンドでもよく、シュリンクパックでもよい。 (2) Modification Example of Laminated Structure of Multiple Metal Case Type Secondary Cells In the specific example of the above-described embodiment, the multiple metal case type secondary cells 14 are fixed by bolts 16 and nuts 18. However, the means for fixing the plurality of metal case type secondary cells in a stacked state is not limited to bolts and nuts. For example, a rubber band or a shrink pack may be used.
　本発明において、１対の電極シートの積層方向に隣り合う２つの金属ケース型二次セルの一方が有する金属ケースは、他方が有する金属ケースに対して前記積層方向に接触していてもよい。 In the present invention, the metal case included in one of the two metal case type secondary cells adjacent in the stacking direction of the pair of electrode sheets may be in contact with the metal case included in the other in the stacking direction.
　本発明の複数の金属ケース型二次セルの各々が有する絶縁キャップ部の凹部の数は、４つに限らない。各絶縁キャップの凹部の数は、１つ以上３つ以下であってもよく、５つ以上であってもよい。なお、各絶縁キャップの凸部の数は、凹部の数と同じである。 The number of recesses of the insulating cap part included in each of the plurality of metal case type secondary cells of the present invention is not limited to four. The number of recesses in each insulating cap may be 1 or more and 3 or less, or 5 or more. Note that the number of convex portions of each insulating cap is the same as the number of concave portions.
　隣り合う２つの金属ケース型二次セルの絶縁キャップ部同士は、凹部と凸部に加えて、それ以外の箇所でも、接触していてもよい。 The insulating cap portions of two adjacent metal case-type secondary cells may be in contact with each other in addition to the concave portion and the convex portion.
　本発明の複数の金属ケース型二次セルの各々が有する絶縁キャップ部は、凹部と凸部を有さなくてもよい。この場合、隣り合う２つの金属ケース型二次セルの絶縁キャップ部同士は、凹部と凸部ではない箇所で、接触していてもよい。 The insulating cap part included in each of the plurality of metal case type secondary cells of the present invention may not have a concave part and a convex part. In this case, the insulating cap parts of two adjacent metal case type secondary cells may be in contact with each other at a place that is not a concave part and a convex part.
　本発明の複数の金属ケース型二次セルの各々の絶縁キャップ部が、凹部と凸部を有さない場合、隣り合う２つの金属ケース型二次セルの絶縁キャップ部同士は、１対の電極シートの積層方向に積層されつつ離れていてもよい。この場合、１対の電極シートの積層方向に隣り合う２つの絶縁キャップ部は、他の部材を介して接触していてもよい。もしくは、１対の電極シートの積層方向に隣り合う２つの金属ケースが、他の部材を介して接触していてもよい。 When each insulating cap part of the plurality of metal case type secondary cells of the present invention does not have a concave part and a convex part, the insulating cap parts of two adjacent metal case type secondary cells are a pair of electrodes. You may leave | separate, laminating | stacking on the lamination direction of a sheet | seat. In this case, the two insulating cap portions adjacent to each other in the stacking direction of the pair of electrode sheets may be in contact with each other via another member. Alternatively, two metal cases adjacent in the stacking direction of the pair of electrode sheets may be in contact with each other through another member.
　（３）金属ケースの変更例
　上述の実施形態の具体例において、金属ケース１４１は、２つの金属ケース部品１４１１、１４１２で構成される。しかし、本発明の金属ケースを構成する部品の数は、２つに限らない。本発明の金属ケースを構成する部品の数は、１つであっても、３つ以上であってもよい。なお、ここでの金属ケースを構成する部品とは、ねじ等の固定部品は含まない。 (3) Modification Example of Metal Case In the specific example of the above-described embodiment, the metal case 141 includes two metal case parts 1411 and 1412. However, the number of parts constituting the metal case of the present invention is not limited to two. The number of parts constituting the metal case of the present invention may be one or three or more. The parts constituting the metal case here do not include fixing parts such as screws.
　（４）金属ケースと内側ケースとの関係についての変更例
　本発明において、内側ケースが金属ケースの第２の内面から離れている場合、内側ケースと金属ケースの第２の内面との間に、多孔質材が配置されてもよい。多孔質材は、例えば、ポリウレタン等の合成樹脂を発砲成形することで得られる。 (4) Modification Example Regarding Relationship Between Metal Case and Inner Case In the present invention, when the inner case is separated from the second inner surface of the metal case, between the inner case and the second inner surface of the metal case, A porous material may be disposed. The porous material can be obtained, for example, by foaming a synthetic resin such as polyurethane.
　本発明において、１対の電極シートの積層方向において、内側ケースの両面が、金属ケースの内面と接触してもよい。内側ケースの両面は、金属ケースの内面と面接触してもよい。 In the present invention, both surfaces of the inner case may be in contact with the inner surface of the metal case in the stacking direction of the pair of electrode sheets. Both surfaces of the inner case may be in surface contact with the inner surface of the metal case.
　（５）電解質の変更例
　上述の実施形態の具体例において、電解質１４９は、電解液である。しかし、本発明における電解質は、固体電解質でもよい。例えば、両面に固体電解質層が形成されたセパレータが、１対の電極シートの間に配置されてもよい。また、例えば、１対の電極シートの向かい合う面の一方または両方が、固体電解質層で覆われていてもよい。 (5) Modification Example of Electrolyte In the specific example of the above-described embodiment, the electrolyte 149 is an electrolytic solution. However, the electrolyte in the present invention may be a solid electrolyte. For example, a separator having a solid electrolyte layer formed on both sides may be disposed between a pair of electrode sheets. Further, for example, one or both of the facing surfaces of the pair of electrode sheets may be covered with a solid electrolyte layer.
　（６）１対のセル端子の変更例
　上述の実施形態の具体例において、リードタブ１４４１は、負極シート１４６の集電体と一体化されている。しかし、本発明において、負極シートに接続されるリードタブは、正極シートの集電体と別部材であってもよい。このリードタブは、負極シートの集電体に接続される。 (6) Modification Example of One Pair of Cell Terminals In the specific example of the above-described embodiment, the lead tab 1441 is integrated with the current collector of the negative electrode sheet 146. However, in the present invention, the lead tab connected to the negative electrode sheet may be a separate member from the current collector of the positive electrode sheet. This lead tab is connected to the current collector of the negative electrode sheet.
　上述の実施形態の具体例において、リードタブ１４５１は、正極シート１４７の集電体と一体化されている。しかし、本発明において、正極シートに接続されるリードタブは、負極シートの集電体と別部材であってもよい。このリードタブは、正極シートの集電体に接続される。 In the specific example of the above-described embodiment, the lead tab 1451 is integrated with the current collector of the positive electrode sheet 147. However, in the present invention, the lead tab connected to the positive electrode sheet may be a separate member from the current collector of the negative electrode sheet. The lead tab is connected to the current collector of the positive electrode sheet.
　上述の実施形態の具体例において、１対のリードタブ１４４１、１４５１は、溶接によって１対の外部端子１４４２、１４５２に接続されている。しかし、本発明の１対のリードタブは、例えばネジ等の機械的な接続手段により、１対の外部端子に接続されてもよい。 In the specific example of the above-described embodiment, the pair of lead tabs 1441 and 1451 are connected to the pair of external terminals 1442 and 1452 by welding. However, the pair of lead tabs of the present invention may be connected to the pair of external terminals by mechanical connection means such as screws.
　上述の実施形態の具体例において、セル端子１４４は、リードタブ１４４１と外部端子１４４２の２つの部材で構成され、セル端子１４５は、リードタブ１４５１と外部端子１４５２の２つの部材で構成される。しかし、本発明において、各セル端子は、１つの部材で構成されてもよい。また、各セル端子は、３つ以上の部材で構成されてもよい。 In the specific example of the above-described embodiment, the cell terminal 144 is composed of two members, the lead tab 1441 and the external terminal 1442, and the cell terminal 145 is composed of two members, the lead tab 1451 and the external terminal 1452. However, in the present invention, each cell terminal may be composed of one member. Each cell terminal may be composed of three or more members.
　本発明において、複数の金属ケース型二次セルの各々が有する１対の接続面は、１対の電極シートの積層方向に垂直な方向を向いていなくてもよい。１対の接続面は、１対の電極シートの積層方向を向いていてもよい。この場合、複数の金属ケース型二次セルを直列に接続するための接続部品が不要になるか、この接続部品の構造をシンプルにできる。 In the present invention, the pair of connection surfaces included in each of the plurality of metal case type secondary cells may not face the direction perpendicular to the stacking direction of the pair of electrode sheets. The pair of connection surfaces may face the stacking direction of the pair of electrode sheets. In this case, a connection part for connecting a plurality of metal case type secondary cells in series is not required, or the structure of the connection part can be simplified.
　上述の実施形態およびその具体例において、複数の金属ケース型二次セル１４の各々が有する１対のセル端子１４４、１４５は、１対の電極シート１４６、１４７の積層方向に垂直な方向において、１対の平坦な電極シート１４６、１４７の両側に配置されている。しかし、本発明において、複数の金属ケース型二次セルの各々が有する１対のセル端子は、１対の電極シートの積層方向に垂直な方向において、１対の平坦な電極シートの片側にのみ配置されてもよい。この場合、正極シートに接続されるリードタブと、負極シートに接続されるリードタブは、内側ケースから同じ方向に突出する。 In the above-described embodiments and specific examples thereof, the pair of cell terminals 144 and 145 included in each of the plurality of metal case-type secondary cells 14 is in a direction perpendicular to the stacking direction of the pair of electrode sheets 146 and 147. A pair of flat electrode sheets 146 and 147 are arranged on both sides. However, in the present invention, the pair of cell terminals included in each of the plurality of metal case-type secondary cells is only on one side of the pair of flat electrode sheets in the direction perpendicular to the stacking direction of the pair of electrode sheets. It may be arranged. In this case, the lead tab connected to the positive electrode sheet and the lead tab connected to the negative electrode sheet protrude from the inner case in the same direction.
　（７）１対のセル端子と絶縁キャップ部についての変更例
　複数の金属ケース型二次セルの各々が有する１対のセル端子が、１対の電極シートの積層方向に垂直な方向において、１対の平坦な電極シートの片側にのみ配置される場合、絶縁キャップ部も、１対の電極シートの積層方向に垂直な方向において、１対の平坦な電極シートの片側にのみ配置される。この場合、絶縁キャップ部は、１つの部品、または、互いに接触する複数の部品で構成されてもよい。 (7) Modification Example for a Pair of Cell Terminals and Insulating Cap Part A pair of cell terminals included in each of the plurality of metal case-type secondary cells is When disposed only on one side of the pair of flat electrode sheets, the insulating cap portion is also disposed only on one side of the pair of flat electrode sheets in a direction perpendicular to the stacking direction of the pair of electrode sheets. In this case, the insulating cap part may be composed of one component or a plurality of components that are in contact with each other.
　（８）１対のセル端子と金属ケースについての変更例
　複数の金属ケース型二次セルの各々が有する１対のセル端子が、１対の電極シートの積層方向に垂直な方向において、１対の平坦な電極シートの片側にのみ配置される場合、金属ケースは、１対の電極シートの積層方向に垂直な方向における一端にのみ開口部を有してもよく、１対の電極シートの積層方向に垂直な方向における両端に開口部を有してもよい。後者の場合、絶縁キャップ部は、金属ケースの両端の開口部の一方にのみ設置される。金属ケースの両端の開口部の他方は、金属以外の材料で形成された部材によって閉塞される。 (8) Modification Example for One Pair of Cell Terminals and Metal Case One pair of cell terminals included in each of the plurality of metal case type secondary cells is one pair in a direction perpendicular to the stacking direction of the pair of electrode sheets. When the metal case is disposed only on one side of the flat electrode sheet, the metal case may have an opening only at one end in a direction perpendicular to the stacking direction of the pair of electrode sheets. You may have an opening part in the both ends in the direction perpendicular | vertical to a direction. In the latter case, the insulating cap portion is installed only in one of the openings at both ends of the metal case. The other of the openings at both ends of the metal case is closed by a member formed of a material other than metal.
　（９）その他の変更例
　上述の実施形態の具体例において、組電池１０は、電池管理装置を備える。しかし、本発明の組電池は、電池管理装置を備えなくてもよい。 (9) Other Modifications In the specific example of the above-described embodiment, the assembled battery 10 includes a battery management device. However, the assembled battery of the present invention may not include a battery management device.
　１０　組電池
　１４　金属ケース型二次セル
　１４１　金属ケース
　１４１１、１４１２　金属ケース部品
　１４１１１ａ　内面（第１の内面）
　１４１２１ａ　内面（第２の内面）
　１４２　内側ケース
　１４３　絶縁キャップ部
　１４３Ａ、１４３Ｂ　絶縁キャップ
　１４３１Ａ、１４３１Ｂ　絶縁キャップ本体
　１４３２Ａ、１４３２Ｂ　絶縁カバー
　１４６　負極シート（電極シート）
　１４７　正極シート（電極シート）
　１４９　電解質
　１４４、１４５　セル端子
　１４４１、１４５１　リードタブ
　１４４２、１４５２　外部端子
　１４４２２ａ、１４５２２ａ　接続面 10 assembled battery 14 metal case type secondary cell 141 metal case 1411, 1412 metal case component 14111a inner surface (first inner surface)
14121a inner surface (second inner surface)
142 Inner case 143 Insulation cap part 143A, 143B Insulation cap 1431A, 1431B Insulation cap body 1432A, 1432B Insulation cover 146 Negative electrode sheet (electrode sheet)
147 Positive electrode sheet (electrode sheet)
149 Electrolyte 144, 145 Cell terminal 1441, 1451 Lead tab 1442, 1452 External terminal 14422a, 14522a Connection surface

Claims (8)

  1. 　１枚の正極シートと１枚の負極シートで構成される１対の電極シートと、
    　前記１対の電極シートを収容する金属製の金属ケースと、
    　絶縁材料で形成され、前記金属ケースの開口部に設置される絶縁キャップ部と、
    　前記１対の電極シートに電気的に接続され、それぞれの一部が前記絶縁キャップ部に設置され、前記金属ケースの外部に露出する１対の接続面を有する１対のセル端子と、
    　を有する金属ケース型二次セルを複数備える組電池であって、
    　前記複数の金属ケース型二次セルの各々は、
    　前記金属ケースの内側に配置され、可撓性を有する合成樹脂製のフィルムで形成され、平坦な状態で積層された前記１対の電極シートを収容し、前記１対の平坦な電極シートと接触するように電解質が封入され、前記１対の平坦な電極シートの積層方向において前記金属ケースの第１の内面と面接触する内側ケースを有し、
    　前記複数の金属ケース型二次セルの各々は、前記１対の平坦な電極シートの前記積層方向における長さが、前記積層方向に垂直な方向における最小長さよりも小さいフラットボード形状であって、
    　前記複数の金属ケース型二次セルが、前記１対の平坦な電極シートの前記積層方向に積層されている、組電池。     A pair of electrode sheets composed of one positive electrode sheet and one negative electrode sheet;
    A metal case made of metal for housing the pair of electrode sheets;
    An insulating cap formed of an insulating material and installed in the opening of the metal case;
    A pair of cell terminals electrically connected to the pair of electrode sheets, each part of which is installed in the insulating cap portion and having a pair of connection surfaces exposed to the outside of the metal case;
    An assembled battery comprising a plurality of metal case type secondary cells having
    Each of the plurality of metal case type secondary cells is
    The pair of electrode sheets, which are disposed inside the metal case, are formed of a flexible synthetic resin film, and are laminated in a flat state, are in contact with the pair of flat electrode sheets. An inner case in which the electrolyte is sealed, and in surface contact with the first inner surface of the metal case in the stacking direction of the pair of flat electrode sheets,
    Each of the plurality of metal case-type secondary cells has a flat board shape in which a length in the stacking direction of the pair of flat electrode sheets is smaller than a minimum length in a direction perpendicular to the stacking direction,
    The assembled battery in which the plurality of metal case type secondary cells are stacked in the stacking direction of the pair of flat electrode sheets.
  2. 　請求項１に記載の組電池であって、
    　前記複数の金属ケース型二次セルの各々において、
    　前記内側ケースが前記金属ケースの前記第１の内面と面接触している状態において、前記内側ケースが、前記金属ケースの前記第１の内面と向かい合う第２の内面から離れている、組電池。     The assembled battery according to claim 1,
    In each of the plurality of metal case type secondary cells,
    The assembled battery, wherein the inner case is separated from a second inner surface facing the first inner surface of the metal case in a state where the inner case is in surface contact with the first inner surface of the metal case.
  3. 　請求項１または２に記載の組電池であって、
    　前記積層方向に隣り合う２つの前記金属ケース型二次セルの一方が有する前記金属ケースが、他方が有する前記金属ケースに対して前記積層方向に離れるように、前記複数の金属ケース型二次セルが積層されている、組電池。     The assembled battery according to claim 1 or 2,
    The plurality of metal case-type secondary cells so that the metal case of one of the two metal case-type secondary cells adjacent in the stacking direction is separated from the metal case of the other in the stacking direction. An assembled battery in which are stacked.
  4. 　請求項１～３の何れか１項に記載の組電池であって、
    　前記積層方向に隣り合う２つの前記金属ケース型二次セルの一方が有する前記絶縁キャップ部が、他方が有する前記絶縁キャップ部に対して前記積層方向に接触するように、前記複数の金属ケース型二次セルが積層されている、組電池。     The assembled battery according to any one of claims 1 to 3,
    The plurality of metal case molds so that the insulating cap part of one of the two metal case type secondary cells adjacent in the stacking direction is in contact with the insulating cap part of the other in the stacking direction. An assembled battery in which secondary cells are stacked.
  5. 　請求項４に記載の組電池であって、
    　前記複数の金属ケース型二次セルの各々の前記絶縁キャップ部は、前記積層方向の一方の面に少なくとも１つの凸部を有し、前記積層方向の他方の面に少なくとも１つの凹部を有し、
    　前記積層方向に隣り合う２つの前記絶縁キャップ部の一方が有する前記少なくとも１つの凸部が、他方が有する前記少なくとも１つの凹部に嵌め込まれている、組電池。     The assembled battery according to claim 4,
    The insulating cap portion of each of the plurality of metal case type secondary cells has at least one convex portion on one surface in the stacking direction and at least one concave portion on the other surface in the stacking direction. ,
    The assembled battery, wherein the at least one convex portion of one of the two insulating cap portions adjacent to each other in the stacking direction is fitted into the at least one concave portion of the other.
  6. 　請求項１～５の何れか１項に記載の組電池であって、
    　前記複数の金属ケース型二次セルの各々が有する前記１対のセル端子が、前記積層方向に垂直な方向において前記１対の平坦な電極シートの両側に配置されている、組電池。     The assembled battery according to any one of claims 1 to 5,
    The assembled battery, wherein the pair of cell terminals included in each of the plurality of metal case type secondary cells is disposed on both sides of the pair of flat electrode sheets in a direction perpendicular to the stacking direction.
  7. 　請求項１～６の何れか１項に記載の組電池であって、
    　前記複数の金属ケース型二次セルの各々が有する前記１対の接続面が、前記積層方向に垂直な方向を向いている、組電池。     The assembled battery according to any one of claims 1 to 6,
    The assembled battery, wherein the pair of connection surfaces of each of the plurality of metal case type secondary cells is oriented in a direction perpendicular to the stacking direction.
  8. 　請求項１～７の何れか１項に記載の組電池であって、
    　前記複数の金属ケース型二次セルの各々が有する前記１対のセル端子が、
    　それぞれの少なくとも一部が前記内側ケースの内側に配置され、前記１対の電極シートに接続された１対のリードタブと、
    　前記１対のリードタブと別部材であって、前記１対のリードタブに接続され、前記絶縁キャップ部に設置され、前記１対の接続面を有する１対の外部端子と、を有する、組電池。     The assembled battery according to any one of claims 1 to 7,
    The pair of cell terminals that each of the plurality of metal case type secondary cells has,
    A pair of lead tabs, at least a portion of each being disposed inside the inner case and connected to the pair of electrode sheets;
    An assembled battery comprising: a pair of lead tabs and a separate member connected to the pair of lead tabs, installed on the insulating cap portion, and having a pair of external terminals.
PCT/JP2017/043900 2016-12-15 2017-12-07 Battery pack WO2018110395A1 (en)

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