WO2024009928A1 - Electric power storage element and electric power storage device - Google Patents

Electric power storage element and electric power storage device Download PDF

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Publication number
WO2024009928A1
WO2024009928A1 PCT/JP2023/024555 JP2023024555W WO2024009928A1 WO 2024009928 A1 WO2024009928 A1 WO 2024009928A1 JP 2023024555 W JP2023024555 W JP 2023024555W WO 2024009928 A1 WO2024009928 A1 WO 2024009928A1
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WO
WIPO (PCT)
Prior art keywords
power storage
lead terminal
storage element
bent
pair
Prior art date
Application number
PCT/JP2023/024555
Other languages
French (fr)
Japanese (ja)
Inventor
崇志 丹光
謙志 河手
Original Assignee
株式会社Ｇｓユアサ
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Filing date
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Publication of WO2024009928A1 publication Critical patent/WO2024009928A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/557—Plate-shaped terminals
    • 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

Definitions

  • the present invention relates to a power storage element and a power storage device.
  • Patent Document 1 discloses a power storage system in which a plurality of pouch-type capacitor cells are housed in a stacked state in a housing.
  • Each capacitor cell has a stacked body housed in a package, and a pair of collector electrodes electrically connected to the stacked body protrudes from one end of the package.
  • both end edges of the pair of collector electrodes in a direction crossing the protruding direction are bent in the same direction.
  • the collector electrodes of each stacked capacitor cell are overlapped and connected by being bent toward each other.
  • a welding jig when connecting the lead terminals, a welding jig may be inserted from outside the exterior film so as to sandwich the lead terminals. If the welding jig interferes with both end edges of the exterior film or the lead terminals during this insertion, there is a risk that welding work will be hindered.
  • the present invention was achieved by the inventor of the present invention paying new attention to the above-mentioned problem, and aims to improve the smoothness of welding work by suppressing interference between the exterior film or lead terminal and the welding jig. purpose.
  • a power storage element includes an electrode body, an exterior film covering the electrode body, and a pair of lead terminals connected to the electrode body and protruding from an edge of the exterior film in a first direction.
  • the exterior film includes a main body film overlapping the electrode body, and a pair of protruding pieces protruding from an edge of the main body film in a second direction intersecting the first direction.
  • the pair of lead terminals are bent in opposite directions in a third direction intersecting the first direction and the second direction, and the pair of protruding pieces are bent in opposite directions in the third direction. It is bent.
  • a plurality of the above power storage elements are stacked.
  • FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment.
  • FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled.
  • FIG. 3 is a perspective view separately showing each of a plurality of power storage elements according to the embodiment.
  • FIG. 4 is an explanatory diagram showing the welding method according to the embodiment.
  • FIG. 5 is a schematic diagram showing a power storage element according to modification example 1.
  • FIG. 6 is a schematic diagram showing a power storage element according to modification example 2.
  • FIG. 7 is a plan view showing a power storage element according to modification example 3.
  • a power storage element includes an electrode body, an exterior film covering the electrode body, and a pair of leads connected to the electrode body and protruding from an edge in a first direction of the exterior film.
  • the exterior film includes a main body film overlapping the electrode body, and a pair of protruding pieces protruding from an edge of the main body film in a second direction intersecting the first direction.
  • the pair of lead terminals are bent in opposite directions in a third direction intersecting the first direction and the second direction, and the pair of protruding pieces are bent in opposite directions to each other in the third direction. It is bent in the opposite direction.
  • the pair of lead terminals protruding from the edge in the first direction of the exterior film are bent in opposite directions, and the pair of lead terminals protruding from the edge in the second direction are bent in opposite directions.
  • the protruding pieces are also bent in opposite directions. Therefore, one side in the second direction is not covered by the protruding piece in any of the lead terminals.
  • the welding jig for welding the lead terminal to the lead terminal of another power storage element can be advanced from the part not covered by the protruding piece to the lead terminal in the second direction. Therefore, interference between the protruding piece of the exterior film or the lead terminal and the welding jig can be suppressed, and the smoothness of the welding work can be improved.
  • the pair of lead terminals has one lead terminal and the other lead terminal, and there is a distance between the one lead terminal and the one lead terminal.
  • the protruding pieces that are close to each other may be bent in opposite directions, and the other lead terminal and the protruding pieces that are close to the other lead terminal may be bent in opposite directions.
  • one lead terminal and the protruding piece that is close to the lead terminal are bent in opposite directions, so the welding process starts from the protruding piece that is closer to the lead terminal. equipment can be entered.
  • the welding jig can enter from the protruding piece that is closer to the other lead terminal. Therefore, while the moving distance of the welding jig is suppressed, interference between the protruding piece of the exterior film or the lead terminal and the welding jig can be suppressed. If the moving distance of the welding jig is suppressed, welding time can also be shortened, and it is possible to further improve the smoothness of welding work.
  • the exterior film has a rectangular shape when viewed from the third direction, and the pair of lead terminals have a rectangular shape when viewed from the third direction. In some cases, it may protrude from the first side of the exterior film.
  • each lead terminal is bent in opposite directions, and each protruding piece is also bent in opposite directions. It is being Therefore, in each lead terminal, one side in the second direction is not covered by the protruding piece. Therefore, even if the power storage element has a pair of lead terminals protruding from the first side, the welding jig can enter the lead terminals from the part not covered by the protruding pieces in the second direction, and the outer film Interference between the protruding piece or lead terminal and the welding jig can be suppressed.
  • the exterior film has a second side opposite to the first side in the first direction, and the first side extends from the first side to the main body film.
  • the distance may be larger than the second distance from the second side to the main body film.
  • the first distance from the first side from which the pair of lead terminals protrudes to the main body film is larger than the second distance on the opposite side, so that the power storage element is controlled.
  • a control board and the like can be placed on the first gap, which is the surplus space. Since the control board is electrically connected to the pair of lead terminals, it is possible to simplify the wiring structure if the control board is arranged at the first interval.
  • the pair of lead terminals may be bent near an edge of the exterior film.
  • the space into which the welding jig is inserted becomes narrow, which tends to cause interference between the welding jig and the lead terminals.
  • the welding jig can be advanced from the part not covered by the protruding piece to the lead terminal in the second direction, so interference with the welding jig is not induced. Even if the structure is easy to bend, the interference can be suppressed.
  • a plurality of power storage elements described in any one of (1) to (5) above are stacked.
  • a pair of lead terminals protruding from the edge of the outer film in the first direction are bent in opposite directions.
  • a pair of protruding pieces protruding from the edge in the second direction are also bent in opposite directions. Therefore, one side in the second direction is not covered by the protruding piece in any of the lead terminals.
  • a welding jig for welding the lead terminals of a pair of adjacent power storage elements can be advanced from a portion not covered by the protruding piece to the lead terminal in the second direction. Therefore, interference between the protruding piece of the exterior film or the lead terminal and the welding jig can be suppressed, and the smoothness of the welding work can be improved.
  • the direction in which the main body and the outer cover of the exterior body of the power storage device are lined up, or the direction in which the plurality of power storage elements included in the power storage device are lined up is defined as the X-axis direction.
  • the protruding direction of each lead terminal of the power storage element is defined as the Y-axis direction.
  • the direction in which a pair of lead terminals provided on a power storage element are lined up or the vertical direction is defined as the Z-axis direction.
  • the X-axis direction corresponds to the third direction
  • the Y-axis direction corresponds to the first direction
  • the Z-axis direction corresponds to the second direction.
  • the Z-axis direction may not be the vertical direction, but for convenience of explanation below, the Z-axis direction will be referred to as the vertical direction.
  • the X-axis plus direction refers to the direction of the X-axis in the arrow direction
  • the X-axis minus direction refers to the side opposite to the X-axis plus direction.
  • Y-axis direction and Z-axis direction The same applies to expressions that indicate relative directions or orientations, such as parallel and orthogonal, even when the directions or orientations are not strictly speaking.Two directions are orthogonal to each other It does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of a few percent.In the following explanation, "insulation" When expressed, it means “electrical insulation.”
  • FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment.
  • FIG. 2 is an exploded perspective view showing each component when power storage device 1 according to the embodiment is disassembled.
  • the power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment.
  • the power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like.
  • the power storage device 1 is a battery for driving or starting an engine of a moving object such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. used as.
  • Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles.
  • Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor.
  • the power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
  • the power storage device 1 includes a power storage unit 20 and an exterior body 10 that houses the power storage unit 20.
  • Exterior body 10 includes a main body 11 that accommodates power storage unit 20 and an outer lid 12 that covers main body 11 .
  • the exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1.
  • the exterior body 10 is a member that fixes the power storage unit 20 and the like in a predetermined position and protects these elements from impact and the like.
  • the main body portion 11 is a bottomed rectangular cylindrical member that is open in the positive direction of the X-axis, and the open portion is the opening 111.
  • the opening 111 has a substantially rectangular shape in plan view (as viewed in the X-axis direction).
  • a plurality of bus bars (not shown) and fuses (not shown) held by the power storage unit 20 are accommodated in the opening 111 of the main body 11.
  • the outer cover 12 is a member that closes the opening 111 of the main body 11, and is joined to the main body 11 in a state where the opening 111 of the main body 11 is closed from the X-axis positive direction.
  • a control board 35 is arranged outside the opening 111 at a position corresponding to the outer lid 12. That is, the control board 35 is housed between the main body part 11 and the outer cover 12.
  • the outer lid 12 has a pair of external terminals 81 (a positive electrode and a negative electrode). External terminal 81 is electrically connected to a plurality of power storage elements 21 included in power storage unit 20 via each bus bar, fuse, and control board 35 . Power storage device 1 charges electricity from the outside via this external terminal 81 and discharges electricity to the outside.
  • the external terminal 81 is made of a conductive member made of metal such as a copper alloy such as brass, copper, aluminum, or an aluminum alloy.
  • Each bus bar is a plate-like member that electrically connects the external terminal 81 and the power storage element 21.
  • Each bus bar is formed of a conductive member made of metal such as copper, copper alloy, aluminum, or aluminum alloy.
  • the fuse is a member that protects the control board 35, the plurality of power storage elements 21, etc. from a large current exceeding the rated value. A fuse cuts off the flow of current by blowing when a current exceeding its rating flows.
  • the control board 35 has a plurality of electrical components (not shown), and these electrical components serve as a detection circuit for detecting the state (temperature, voltage, current, etc.) of each power storage element 21, and for controlling charging and discharging.
  • a control circuit and the like for control are formed.
  • the main body 11 and outer lid 12 of the exterior body 10 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)). ), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES) ), polyamide (PA), ABS resin, or composite materials thereof, or metal coated with insulation.
  • the exterior body 10 thereby prevents the power storage element 21 and the like from coming into contact with external metal members and the like.
  • the exterior body 10 may be formed of a conductive member such as metal, as long as the electrical insulation of the power storage element 21 and the like is maintained.
  • the power storage unit 20 includes a plurality of power storage elements 21 and a holding section 22 that holds the plurality of power storage elements 21.
  • the power storage element 21 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
  • the power storage element 21 is a pouch-type power storage element having a flat shape, and a plurality of (four in this embodiment) pouch-type power storage elements 21 are arranged side by side in the X-axis direction. has been done.
  • the power storage element 21 is not a pouch-type power storage element, but may be a flat rectangular parallelepiped (prismatic), cylindrical, long cylinder, or elliptical cylinder, and its size and shape are not limited.
  • the number of power storage elements 21 arranged is also not particularly limited.
  • the power storage element 21 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor.
  • the power storage element 21 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it.
  • the plurality of power storage elements 21 are arranged in the X-axis direction, and adjacent power storage elements 21 may or may not be joined with adhesive or double-sided tape. Details of the power storage element 21 will be described later.
  • the holding part 22 is a part that holds a plurality of power storage elements 21.
  • the holding portion 22 includes a first holding member 23 and a second holding member 24 that holds the plurality of power storage elements 21 together with the first holding member 23.
  • the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21, and the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21. are joined with adhesive or double-sided tape.
  • the second holding member 24 is arranged in the X-axis positive direction of the plurality of power storage elements 21, and is attached to the power storage element 21 arranged at the end of the plurality of power storage elements 21 in the X-axis positive direction with adhesive or double-sided adhesive. Joined with tape. Thereby, the first holding member 23 and the second holding member 24 hold the plurality of power storage elements 21 on both sides in the X-axis direction. Note that at least one of the first holding member 23 and the second holding member 24 does not need to be joined to the power storage element 21.
  • the first holding member 23 and the second holding member 24 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate. (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyamide (PA) ), ABS resin, and composite materials thereof.
  • PC polycarbonate
  • PP polypropylene
  • PE polyethylene
  • PPS polyphenylene sulfide resin
  • PPE polyphenylene ether
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEEK polyetheretherketone
  • PTFE polytetrafluoroethylene perfluoroalkyl vinyl
  • the first holding member 23 and the second holding member 24 prevent the plurality of power storage elements 21 from being electrically connected to a conductive member such as an external metal member.
  • a conductive member such as an external metal member.
  • the first holding member 23 and the second holding member 24 may be formed of a conductive member such as metal.
  • the first holding member 23 has a flat plate portion 25 that overlaps the power storage element 21 at the end in the negative direction of the X-axis, and a bus bar support portion 26 that extends from the flat plate portion 25 in the positive direction of the X-axis.
  • the bus bar support section 26 extends from the corner of the flat plate section 25 in the Y-axis minus direction and the Z-axis minus direction in the X-axis plus direction, and supports a bus bar (not shown).
  • the second holding member 24 has a substrate support portion 27 that overlaps the power storage element 21 at the end in the X-axis positive direction, and a detection line support portion 28 that extends from the substrate support portion 27 in the X-axis negative direction.
  • the board support part 27 supports the control board 35 and has a surrounding wall 29 surrounding the control board 35. Further, the substrate support section 27 supports a bus bar and a fuse (not shown).
  • the detection line support part 28 is a part that supports a plurality of detection lines 36 connected to the control board 35 in order to detect the state (temperature, voltage, current, etc.) of each power storage element 21.
  • the detection line support section 28 extends from the end of the substrate support section 27 in the Y-axis minus direction in the X-axis minus direction.
  • FIG. 3 is a perspective view separately showing each of the plurality of power storage elements 21 according to the embodiment.
  • the plurality of power storage elements 21 have the same basic structure, their external shapes are partially different. Specifically, the outer shapes of the odd-numbered power storage elements 21 in order from the X-axis negative direction and the even-numbered power storage elements 21 in order from the X-axis negative direction are partially different. In other words, the odd-numbered power storage elements 21 have the same outer shape, and the even-numbered power storage elements 21 have the same outer shape.
  • the power storage element 21 has an exterior film 210 and a pair of lead terminals 220 (positive electrode and negative electrode), and inside the exterior film 210, an electrode body 211 and an electrolyte (non-aqueous electrolyte: not shown) are provided. ) etc. are accommodated.
  • an electrode body 211 and an electrolyte non-aqueous electrolyte: not shown
  • electrolyte non-aqueous electrolyte: not shown
  • the exterior film 210 is a sheet-like exterior body formed of a laminate film, and contains the electrode body 211, electrolyte, etc. therein in a sealed state under reduced pressure.
  • the exterior film 210 is constructed by stacking two rectangular laminate films in the X-axis direction. The two laminate films are joined (sealed) by thermal welding or the like with a pair of lead terminals 220 in between. In the two laminate films, at locations that do not correspond to the pair of lead terminals 220, the two laminate films are joined (sealed) to each other by thermal welding or the like.
  • Laminate film is a flexible film consisting of multiple layers including a metal layer such as aluminum and a resin layer such as polypropylene (PP) or polyethylene (PE). has been done. Note that the exterior film 210 may be constructed by forming a single laminate film into a bag shape and joining the ends of the laminate film together by thermal welding.
  • the lead terminal 220 is a conductive plate-like member (lead plate) electrically connected to the electrode body 211, and is disposed so as to penetrate through the exterior film 210 and be exposed from the exterior film 210.
  • a pair of lead terminals 220 aligned in the Z-axis direction are arranged to protrude in the Y-axis minus direction from the end of the exterior film 210 in the Y-axis minus direction.
  • the positive lead terminal 220 is a lead terminal electrically connected to the positive plate of the electrode body 211
  • the negative lead terminal 220 is a lead terminal electrically connected to the negative plate of the electrode body 211. It is a lead terminal.
  • the lead terminal 220 is a metal terminal for leading the electricity stored in the electrode body 211 to the external space of the electricity storage element 21 and for introducing electricity into the internal space of the electricity storage element 21 in order to store electricity in the electrode body 211. It is an electrode terminal made by.
  • the lead terminal 220 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
  • the electrode body 211 is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.
  • the positive electrode plate has a positive electrode active material layer formed on a current collector foil made of metal such as aluminum or aluminum alloy.
  • the negative electrode plate has a negative electrode active material layer formed on a current collector foil made of metal such as copper or copper alloy.
  • the active material used for the positive electrode active material layer and the negative electrode active material layer any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions.
  • As the separator a microporous sheet made of resin, a nonwoven fabric, or the like can be used.
  • the electrode body 211 is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the X-axis direction.
  • the electrode body 211 may be a wound type electrode body formed by winding electrode plates (a positive electrode plate and a negative electrode plate), or a laminated type (stack type) formed by laminating a plurality of flat electrode plates. ), a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape, or any other form of electrode body may be used.
  • the exterior film 210 includes a main body film 212 that overlaps the electrode body 211, and a body film 212 that protrudes outward from the entire periphery of the main body film 212. It has a frame portion 213.
  • the main body film 212 overlaps each side of the electrode body 211.
  • the frame portion 213 is a sheet-like portion, and is formed in a rectangular shape when viewed from the X-axis direction.
  • a pair of lead terminals 220 protrude in the negative Y-axis direction from the first side 214, which is the edge in the negative Y-axis direction, of the frame portion 213, and extend in the X-axis direction (third direction) in opposite directions. It is folded into.
  • Each lead terminal 220 is bent near the first side 214 of the exterior film 210. Assuming that the length from the first side 214 to the tip of each lead terminal 220 is the protrusion length, each lead terminal 220 is preferably bent within 1/3 of the protrusion length from the first side 214.
  • a portion farther from the main body film 212 with respect to the bending position is referred to as a tip portion 230.
  • the tip 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis minus direction, and the tip 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis plus direction. It is being On the other hand, in the even-numbered energy storage elements 21, the tip portion 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis plus direction, and the tip portion 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis minus direction. It is bent in the negative direction.
  • the portions of the frame portion 213 that sandwich the main body film 212 in the Y-axis direction (first direction) are formed in a flat shape.
  • the portion sandwiched in the Z-axis direction (second direction) is bent.
  • the portions of the frame portion 213 that sandwich the main body film 212 in the Z-axis direction are a pair of protruding pieces 240 that protrude from the edges of the main body film 212 in the Z-axis direction.
  • the pair of protruding pieces 240 protrude in the Z-axis direction and are bent in the X-axis direction in opposite directions.
  • the protruding piece 241 in the positive direction of the Z-axis is bent in the positive direction of the X-axis
  • the protruding piece 242 in the negative direction of the Z-axis is bent in the negative direction of the X-axis. That is, in the odd-numbered power storage elements 21, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions. In odd-numbered power storage elements 21, the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
  • the protruding pieces 241 in the positive direction of the Z-axis are bent in the negative direction of the X-axis, and the protruding pieces 242 in the negative direction of the Z-axis are bent in the positive direction of the X-axis.
  • one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions.
  • the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
  • the lead terminal 220 of each power storage element 21 is joined to the lead terminal 220 of another power storage element 21 or a bus bar.
  • the lead terminal 221 of the first power storage element 21 has a tip 231 welded to a bus bar (not shown).
  • the lead terminals 222 of the first power storage element 21 and the lead terminals 222 of the second power storage element 21 are welded at their tip portions 232 to each other.
  • the lead terminals 221 of the second power storage element 21 and the lead terminals 221 of the third power storage element 21 are welded at their tip portions 231 to each other.
  • the lead terminals 222 of the third power storage element 21 and the lead terminals 222 of the fourth power storage element 21 are welded at their tip portions 232 to each other.
  • a leading end 231 of the lead terminal 221 of the fourth power storage element 21 is welded to another bus bar (not shown).
  • FIG. 4 is an explanatory diagram showing the welding method according to the embodiment.
  • the second power storage element 21 from the negative direction of the X-axis center power storage element 21 in FIG. 4 will be described as an example.
  • the lead terminals 221 of the second power storage element 21 and the lead terminals 221 of the third power storage element 21 are welded at their tips 231, and the lead terminals 222 of the second power storage element 21, Lead terminals 222 of the first power storage element 21 are welded together at their tip portions 232 .
  • Welding methods such as ultrasonic welding, resistance welding, and laser welding are used for this welding. In either welding method, a welding jig for welding the tip portions 230 together moves forward and backward toward the overlapping tip portions 230.
  • arrows Y1 and Y2 indicate paths along which the welding jig moves toward the tips 230.
  • the tips 231 of the lead terminal 221 of the second power storage element 21 and the lead terminal 221 of the third power storage element 21 Attention is paid to the tips 231 of the lead terminal 221 of the second power storage element 21 and the lead terminal 221 of the third power storage element 21.
  • the protruding piece 241 of the second power storage element 21 is bent in the X-axis negative direction
  • the protruding piece 241 of the third power storage element 21 is bent in the X-axis positive direction.
  • the tips 231 are open in the positive Z-axis direction.
  • the welding jig even if the welding jig enters from the open part of the tip portions 231 in the Z-axis plus direction, the welding jig will not interfere with the tip portions 231 or each protruding piece 241, and the welding jig will not interfere with the tip portions 231 or each protruding piece 241. can be moved (arrow Y1). At this time, since the welding jig can enter the tip portions 231 from the protrusion piece 241 that is closer to each other, the moving distance of the welding jig can be suppressed. After entering, the welding jig performs welding from the position where the tip portions 231 are sandwiched between each other in the Y-axis direction.
  • the tips 232 of the lead terminal 222 of the second power storage element 21 and the lead terminal 222 of the first power storage element 21 Attention is paid to the tips 232 of the lead terminal 222 of the second power storage element 21 and the lead terminal 222 of the first power storage element 21.
  • the protruding piece 242 of the second power storage element 21 is bent in the X-axis positive direction, and the protruding piece 242 of the first power storage element 21 is bent in the X-axis negative direction.
  • the tips 232 are open in the negative Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 232 in the negative Z-axis direction, the welding jig can reach the tip portions 232 without interfering with the tip portions 232 or each protruding piece 242.
  • the welding jig can be moved (arrow Y2). At this time, since the welding jig can enter the tip portions 232 from the protrusion piece 242 that is closer to each other, the moving distance of the welding jig can be suppressed. After entering, the welding jig performs welding from the position where the tip portions 232 are sandwiched between each other in the Y-axis direction.
  • the pair of lead terminals 220 protruding from the edges of the exterior film 210 in the Y-axis direction are bent in opposite directions, and A pair of protruding pieces 240 protruding from the edge in the second direction) are also bent in opposite directions. Therefore, one side of each lead terminal 220 in the Z-axis direction is not covered by the protruding piece 240.
  • the welding jig can enter from the protruding piece 240 that is closer to the lead terminal 220.
  • the other lead terminal 220 and the protruding piece 240 that is closer to the lead terminal 220 are bent in opposite directions, it is possible to enter the welding jig from the protruding piece 240 that is closer to the other lead terminal 220. can. Therefore, interference between the protruding piece 240 of the exterior film 210 or the lead terminal 220 and the welding jig can be suppressed while suppressing the moving distance of the welding jig. If the moving distance of the welding jig is suppressed, welding time can also be shortened, and it is possible to further improve the smoothness of welding work.
  • each lead terminal 220 is bent in opposite directions, and each protruding piece 240 is also bent in opposite directions. Therefore, in each lead terminal 220, one side in the Z-axis direction is not covered by the protruding piece 240. Therefore, even if the power storage element 21 has a pair of lead terminals 220 protruding from the first side 214, the welding jig cannot enter the lead terminals 220 from a portion not covered by the protruding pieces 240 in the Z-axis direction. Therefore, interference between the protruding piece 240 of the exterior film 210 or the lead terminal 220 and the welding jig can be suppressed.
  • each lead terminal 220 is bent near the edge of the exterior film 210, the space into which the welding jig is inserted becomes narrow, which tends to cause interference between the welding jig and the lead terminals 220.
  • the welding jig can enter the lead terminal 220 from a portion not covered by the protruding piece 240 in the Z-axis direction, so the bending structure that is likely to cause interference with the welding jig is avoided. Even if it is, the interference can be suppressed.
  • FIG. 5 is a schematic diagram showing a power storage element 21a according to modification example 1.
  • FIG. 5 is a diagram corresponding to FIG. 4.
  • each power storage element 21a has a lead terminal 221 protruding from the first side 214 of the exterior film 210 in the negative Y-axis direction and then being bent, and a lead terminal 222a on the second side of the exterior film 210 (see FIG. 5, it is placed on the back side of the first side 214.) and is bent in the Y-axis plus direction.
  • the base of the lead terminal 222a is hidden by the main body film 212 and is therefore shown with a broken line.
  • the leading ends 231 of the lead terminal 221 of the second power storage element 21a and the lead terminal 221 of the third power storage element 21a are open in the Z-axis positive direction. Therefore, even if the welding jig enters from the open part of the tip portions 231 in the Z-axis plus direction, the welding jig will not interfere with the tip portions 231 or each protruding piece 241, and the welding jig will not interfere with the tip portions 231 or each protruding piece 241. can be moved (arrow Y3).
  • the tips 232 of the lead terminal 222a of the second power storage element 21a and the lead terminal 222a of the first power storage element 21a are open in the negative Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 232 in the negative Z-axis direction, the welding jig can reach the tip portions 232 without interfering with the tip portions 232 or each protruding piece 242. can be moved (arrow Y4).
  • FIG. 6 is a schematic diagram showing a power storage element 21b according to modification 2.
  • FIG. 6 is a diagram corresponding to FIG. 4.
  • the protruding piece 241b in the positive direction of the Z-axis is bent in the negative direction of the X-axis
  • the protruding piece 242b in the negative direction of the Z-axis is bent in the positive direction of the X-axis. ing. That is, in the odd-numbered power storage element 21b, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 242b that is far from the lead terminal 221 are bent in opposite directions. In odd-numbered power storage elements 21b, the other lead terminal 222 and the protruding piece 241b that is far from the lead terminal 222 are bent in opposite directions.
  • the protruding pieces 241b in the positive direction of the Z-axis are bent in the positive direction of the X-axis, and the protruding pieces 242b in the negative direction of the Z-axis are bent in the negative direction of the X-axis.
  • one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 242b that is far from the lead terminal 221 are bent in opposite directions.
  • the other lead terminal 222 and the protruding piece 241b that is far away from the lead terminal 222 are bent in opposite directions.
  • the leading ends 231 of the lead terminal 221 of the second power storage element 21b and the lead terminal 221 of the third power storage element 21b are open in the negative Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 231 in the negative Z-axis direction, the welding jig will not interfere with the tip portions 231 or each protruding piece 242b, and the welding jig will not interfere with the tip portions 231 or each protruding piece 242b. can be moved (arrow Y5).
  • the tips 232 of the lead terminal 222 of the second power storage element 21b and the lead terminal 222 of the first power storage element 21b are open in the Z-axis positive direction. Therefore, even if the welding jig enters from the open part of the tip portions 232 in the Z-axis plus direction, the welding jig can reach the tip portions 232 without interfering with the tip portions 232 or each protruding piece 241b. can be moved (arrow Y6).
  • the distance between one lead terminal and the protruding piece that is bent in the opposite direction to the one lead terminal may be the same as the distance between the other lead terminal and the protruding piece that is bent in the opposite direction to the other lead terminal.
  • FIG. 7 is a plan view showing a power storage element 21c according to modification 3.
  • the first interval S1 from the first side 214c to the main body film 212c is the distance from the second side 215c on the opposite side to the first side 214c to the main body film 212c. is larger than the second interval S2.
  • the first distance S1 from the first side 214c from which the pair of lead terminals 220 protrudes to the main body film 212c is larger than the second distance S2 on the opposite side, control for controlling the power storage element 21c is performed.
  • a substrate or the like can be placed on the first spacing S1, which is the surplus space. Since the control board is electrically connected to the pair of lead terminals 220, the wiring structure can be simplified if it is arranged at the first interval S1.
  • the second interval may be wider than the first interval, or the first interval and the second interval may be the same.
  • the exterior film 210 is rectangular when viewed from the X-axis direction, but the exterior film may have any shape.
  • Other external shapes of the exterior film include polygonal shapes other than rectangular shapes, oval shapes, elliptical shapes, circular shapes, and the like.
  • the lead terminal 220 is bent near the edge of the exterior film 210, but the lead terminal may be bent at a position further away from the vicinity of the edge of the exterior film.
  • Embodiments constructed by arbitrarily combining components included in the embodiments and their modifications are also included within the scope of the present invention.
  • the present invention can be applied to power storage elements such as lithium ion secondary batteries.
  • Power storage device 10 Exterior body 11 Main body 12 Outer cover 20 Power storage units 21, 21a, 21b, 21c Power storage element 22 Holding portion 23 First holding member 24 Second holding member 25 Flat plate portion 26 Bus bar support portion 27 Board support portion 28 Detection Line support section 29 Surrounding wall 35 Control board 36 Detection wire 81 External terminal 111 Openings 210, 210c Exterior film 211 Electrode body 212, 212c Main body film 213 Frame section 214, 214c First side 215c Second side 220, 221, 222, 222a Lead terminals 230, 231, 232 Tips 240, 241, 241b, 242, 242b Projecting piece S1 First interval S2 Second interval Y1, Y2, Y3, Y4, Y5, Y6 Arrow

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Abstract

This electric power storage element comprises an electrode body, an outer packaging film that covers the electrode body, and a pair of lead terminals that are connected to the electrode body and protrude from an edge of the outer packaging film in one direction. The outer packaging film comprises a main film that overlaps the electrode body, and a pair of protruding pieces that constitute the edges of the main film, said protruding pieces protruding from edges in a second direction that intersects the first direction. The pair of lead terminals are folded in opposite directions from each other, in a third direction that intersects the first direction and the second direction. The pair of protruding pieces are folded in opposite directions from each other in the third direction.

Description

蓄電素子及び蓄電装置Energy storage elements and energy storage devices
　本発明は、蓄電素子及び蓄電装置に関する。 The present invention relates to a power storage element and a power storage device.
　特許文献１には、複数のパウチタイプのキャパシタセルが積層された状態でハウジング内に収容されている蓄電システムが開示されている。各キャパシタセルは、パッケージ内に積層体が収容されており、積層体に電気的に接続された一対の集電極がパッケージの一端部から突出している。パッケージにおいて、一対の集電極の突出方向に交差する方向の両端縁部は、同じ方向に折り曲げられている。積層された各キャパシタセルの集電極同士は、互いに近づくように折り曲げられることで重ねられ、接続されている。 Patent Document 1 discloses a power storage system in which a plurality of pouch-type capacitor cells are housed in a stacked state in a housing. Each capacitor cell has a stacked body housed in a package, and a pair of collector electrodes electrically connected to the stacked body protrudes from one end of the package. In the package, both end edges of the pair of collector electrodes in a direction crossing the protruding direction are bent in the same direction. The collector electrodes of each stacked capacitor cell are overlapped and connected by being bent toward each other.
特開２００７－１１００３５号公報Japanese Patent Application Publication No. 2007-110035
　ここで、リード端子同士を接続する際には、溶接治具を外装フィルムの外方から、リード端子同士を挟むように挿入する場合がある。この挿入時に溶接治具が外装フィルムの両端縁部またはリード端子に干渉してしまうと、溶接作業を阻害するおそれがある。 Here, when connecting the lead terminals, a welding jig may be inserted from outside the exterior film so as to sandwich the lead terminals. If the welding jig interferes with both end edges of the exterior film or the lead terminals during this insertion, there is a risk that welding work will be hindered.
　本発明は、本願発明者が上記課題に新たに着目することによってなされたものであり、外装フィルムまたはリード端子と、溶接治具との干渉を抑制することで溶接作業の円滑性を高めることを目的とする。 The present invention was achieved by the inventor of the present invention paying new attention to the above-mentioned problem, and aims to improve the smoothness of welding work by suppressing interference between the exterior film or lead terminal and the welding jig. purpose.
　本発明の一態様に係る蓄電素子は、電極体と、前記電極体を覆う外装フィルムと、前記電極体に接続されて前記外装フィルムの第一方向の端縁から突出した一対のリード端子と、を備え、前記外装フィルムは、前記電極体に重なる本体フィルムと、前記本体フィルムの端縁であって、前記第一方向に交差する第二方向の端縁から突出した一対の突出片と、を備え、前記一対のリード端子は、前記第一方向及び前記第二方向に交差する第三方向において互いに逆方向に折り曲げられており、前記一対の突出片は、前記第三方向において互いに逆方向に折り曲げられている。 A power storage element according to one aspect of the present invention includes an electrode body, an exterior film covering the electrode body, and a pair of lead terminals connected to the electrode body and protruding from an edge of the exterior film in a first direction. The exterior film includes a main body film overlapping the electrode body, and a pair of protruding pieces protruding from an edge of the main body film in a second direction intersecting the first direction. The pair of lead terminals are bent in opposite directions in a third direction intersecting the first direction and the second direction, and the pair of protruding pieces are bent in opposite directions in the third direction. It is bent.
　本発明の一態様に係る蓄電装置は、上記蓄電素子が複数積層されている。 In a power storage device according to one embodiment of the present invention, a plurality of the above power storage elements are stacked.
　本発明によれば、外装フィルムまたはリード端子と、溶接治具との干渉を抑制することで溶接作業の円滑性を高めることができる。 According to the present invention, it is possible to improve the smoothness of welding work by suppressing interference between the exterior film or lead terminal and the welding jig.
図１は、実施の形態に係る蓄電装置の外観を示す斜視図である。FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. 図２は、実施の形態に係る蓄電装置を分解した場合の各構成要素を示す分解斜視図である。FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. 図３は、実施の形態に係る複数の蓄電素子のそれぞれを分離して示す斜視図である。FIG. 3 is a perspective view separately showing each of a plurality of power storage elements according to the embodiment. 図４は、実施の形態に係る溶接方法を示すための説明図である。FIG. 4 is an explanatory diagram showing the welding method according to the embodiment. 図５は、変形例１に係る蓄電素子を示す模式図である。FIG. 5 is a schematic diagram showing a power storage element according to modification example 1. 図６は、変形例２に係る蓄電素子を示す模式図である。FIG. 6 is a schematic diagram showing a power storage element according to modification example 2. 図７は、変形例３に係る蓄電素子を示す平面図である。FIG. 7 is a plan view showing a power storage element according to modification example 3.
　（１）本発明の一態様に係る蓄電素子は、電極体と、前記電極体を覆う外装フィルムと、前記電極体に接続されて前記外装フィルムの第一方向の端縁から突出した一対のリード端子と、を備え、前記外装フィルムは、前記電極体に重なる本体フィルムと、前記本体フィルムの端縁であって、前記第一方向に交差する第二方向の端縁から突出した一対の突出片と、を備え、前記一対のリード端子は、前記第一方向及び前記第二方向に交差する第三方向において互いに逆方向に折り曲げられており、前記一対の突出片は、前記第三方向において互いに逆方向に折り曲げられている。 (1) A power storage element according to one aspect of the present invention includes an electrode body, an exterior film covering the electrode body, and a pair of leads connected to the electrode body and protruding from an edge in a first direction of the exterior film. a terminal, the exterior film includes a main body film overlapping the electrode body, and a pair of protruding pieces protruding from an edge of the main body film in a second direction intersecting the first direction. , the pair of lead terminals are bent in opposite directions in a third direction intersecting the first direction and the second direction, and the pair of protruding pieces are bent in opposite directions to each other in the third direction. It is bent in the opposite direction.
　本発明の一態様に係る蓄電素子によれば、外装フィルムの第一方向の端縁から突出した一対のリード端子が互いに逆方向に折り曲げられていて、第二方向の端縁から突出した一対の突出片も互いに逆方向に折り曲げられている。このため、いずれのリード端子においても、第二方向の一方が突出片で覆われないこととなる。これにより、リード端子を他の蓄電素子のリード端子に溶接するための溶接治具を、第二方向で突出片に覆われていない部位からリード端子まで進入させることができる。したがって、外装フィルムの突出片またはリード端子と溶接治具との干渉を抑制でき、溶接作業の円滑性を高めることができる。 According to the power storage element according to one aspect of the present invention, the pair of lead terminals protruding from the edge in the first direction of the exterior film are bent in opposite directions, and the pair of lead terminals protruding from the edge in the second direction are bent in opposite directions. The protruding pieces are also bent in opposite directions. Therefore, one side in the second direction is not covered by the protruding piece in any of the lead terminals. Thereby, the welding jig for welding the lead terminal to the lead terminal of another power storage element can be advanced from the part not covered by the protruding piece to the lead terminal in the second direction. Therefore, interference between the protruding piece of the exterior film or the lead terminal and the welding jig can be suppressed, and the smoothness of the welding work can be improved.
　（２）上記（１）に記載の蓄電素子において、前記一対のリード端子は、一方のリード端子と、他方のリード端子と、を有し、前記一方のリード端子と前記一方のリード端子に距離が近い突出片とは、互いに逆方向に折り曲げられており、前記他方のリード端子と前記他方のリード端子に距離が近い突出片とは、互いに逆方向に折り曲げられてもよい。 (2) In the power storage element according to (1) above, the pair of lead terminals has one lead terminal and the other lead terminal, and there is a distance between the one lead terminal and the one lead terminal. The protruding pieces that are close to each other may be bent in opposite directions, and the other lead terminal and the protruding pieces that are close to the other lead terminal may be bent in opposite directions.
　上記（２）に記載の蓄電素子によれば、一方のリード端子と当該リード端子に距離が近い突出片とが互いに逆方向に折り曲げられているので、この距離が近い突出片の方から溶接治具を進入させることができる。同様に、他方のリード端子と当該リード端子に距離が近い突出片とが互いに逆方向に折り曲げられているので、この距離が近い突出片の方から溶接治具を進入させることができる。したがって、溶接治具の移動距離を抑制しながらも、外装フィルムの突出片またはリード端子と溶接治具との干渉を抑制できる。溶接治具の移動距離が抑制されるのであれば溶接時間も短縮化され、溶接作業の円滑性をより高めることが可能である。 According to the energy storage element described in (2) above, one lead terminal and the protruding piece that is close to the lead terminal are bent in opposite directions, so the welding process starts from the protruding piece that is closer to the lead terminal. equipment can be entered. Similarly, since the other lead terminal and the protruding piece that is closer to the lead terminal are bent in opposite directions, the welding jig can enter from the protruding piece that is closer to the other lead terminal. Therefore, while the moving distance of the welding jig is suppressed, interference between the protruding piece of the exterior film or the lead terminal and the welding jig can be suppressed. If the moving distance of the welding jig is suppressed, welding time can also be shortened, and it is possible to further improve the smoothness of welding work.
　（３）上記（１）または（２）に記載の蓄電素子において、前記外装フィルムは前記第三方向から見た場合に矩形状であり、前記一対のリード端子は、前記第三方向から見た場合において前記外装フィルムの第一辺から突出してもよい。 (3) In the energy storage device according to (1) or (2) above, the exterior film has a rectangular shape when viewed from the third direction, and the pair of lead terminals have a rectangular shape when viewed from the third direction. In some cases, it may protrude from the first side of the exterior film.
　上記（３）に記載の蓄電素子によれば、第一辺から一対のリード端子が突出した蓄電素子においても、各リード端子が互いに逆方向に折り曲げられて、各突出片も互いに逆方向に折り曲げられている。このため、各リード端子では、第二方向の一方が突出片で覆われないこととなる。したがって、第一辺から一対のリード端子が突出した蓄電素子であっても、溶接治具を、第二方向で突出片に覆われていない部位からリード端子まで進入させることができ、外装フィルムの突出片またはリード端子と溶接治具との干渉を抑制できる。 According to the electricity storage element described in (3) above, even in the electricity storage element in which a pair of lead terminals protrudes from the first side, each lead terminal is bent in opposite directions, and each protruding piece is also bent in opposite directions. It is being Therefore, in each lead terminal, one side in the second direction is not covered by the protruding piece. Therefore, even if the power storage element has a pair of lead terminals protruding from the first side, the welding jig can enter the lead terminals from the part not covered by the protruding pieces in the second direction, and the outer film Interference between the protruding piece or lead terminal and the welding jig can be suppressed.
　（４）上記（３）に記載の蓄電素子において、前記外装フィルムは、前記第一方向において前記第一辺に対向する第二辺を有し、前記第一辺から前記本体フィルムまでの第一間隔は、前記第二辺から前記本体フィルムまでの第二間隔よりも大きくてもよい。 (4) In the energy storage device according to (3) above, the exterior film has a second side opposite to the first side in the first direction, and the first side extends from the first side to the main body film. The distance may be larger than the second distance from the second side to the main body film.
　上記（４）に記載の蓄電素子によれば、一対のリード端子が突出している第一辺から本体フィルムまでの第一間隔が、反対側の第二間隔よりも大きいので、蓄電素子を制御するための制御基板などを、余剰空間である第一間隔上に配置することができる。制御基板は、一対のリード端子に電気的に接続されるので、第一間隔に配置されるのであれば、配線構造を簡素化することも可能である。 According to the power storage element described in (4) above, the first distance from the first side from which the pair of lead terminals protrudes to the main body film is larger than the second distance on the opposite side, so that the power storage element is controlled. A control board and the like can be placed on the first gap, which is the surplus space. Since the control board is electrically connected to the pair of lead terminals, it is possible to simplify the wiring structure if the control board is arranged at the first interval.
　（５）上記（１）から（４）のいずれかひとつに記載の蓄電素子において、前記一対のリード端子は、前記外装フィルムの端縁近傍で折り曲げられてもよい。 (5) In the electricity storage element according to any one of (1) to (4) above, the pair of lead terminals may be bent near an edge of the exterior film.
　各リード端子が外装フィルムの端縁近傍で折り曲げられていると、溶接治具を挿入するスペースが狭くなってしまい、溶接治具とリード端子との干渉を誘発しやすい。上記（５）に記載の蓄電素子によれば、溶接治具を、第二方向で突出片に覆われていない部位からリード端子まで進入させることができるので、溶接治具との干渉を誘発しやすい折り曲げ構造であったとしても、当該干渉を抑制できる。 If each lead terminal is bent near the edge of the exterior film, the space into which the welding jig is inserted becomes narrow, which tends to cause interference between the welding jig and the lead terminals. According to the energy storage element described in (5) above, the welding jig can be advanced from the part not covered by the protruding piece to the lead terminal in the second direction, so interference with the welding jig is not induced. Even if the structure is easy to bend, the interference can be suppressed.
　本発明の一態様に係る蓄電装置は、上記（１）から（５）のいずれかひとつに記載の蓄電素子が複数積層されている。 In a power storage device according to one embodiment of the present invention, a plurality of power storage elements described in any one of (1) to (5) above are stacked.
　本発明の一態様に係る蓄電装置によれば、蓄電装置に備わる複数積層された蓄電素子は、それぞれ外装フィルムの第一方向の端縁から突出した一対のリード端子が互いに逆方向に折り曲げられていて、第二方向の端縁から突出した一対の突出片も互いに逆方向に折り曲げられている。このため、いずれのリード端子においても、第二方向の一方が突出片で覆われないこととなる。これにより、隣り合う一対の蓄電素子のリード端子同士を溶接するための溶接治具を、第二方向で突出片に覆われていない部位からリード端子まで進入させることができる。したがって、外装フィルムの突出片またはリード端子と溶接治具との干渉を抑制でき、溶接作業の円滑性を高めることができる。 According to the power storage device according to one aspect of the present invention, in the plurality of stacked power storage elements included in the power storage device, a pair of lead terminals protruding from the edge of the outer film in the first direction are bent in opposite directions. A pair of protruding pieces protruding from the edge in the second direction are also bent in opposite directions. Therefore, one side in the second direction is not covered by the protruding piece in any of the lead terminals. Thereby, a welding jig for welding the lead terminals of a pair of adjacent power storage elements can be advanced from a portion not covered by the protruding piece to the lead terminal in the second direction. Therefore, interference between the protruding piece of the exterior film or the lead terminal and the welding jig can be suppressed, and the smoothness of the welding work can be improved.
　（実施の形態）
　以下、図面を参照しながら、本発明の実施の形態（その変形例も含む）に係る蓄電装置について説明する。以下で説明する実施の形態は、いずれも包括的または具体的な例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態などは、一例であり、本発明を限定する主旨ではない。各図において、寸法等は厳密に図示したものではない。 (Embodiment)
Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. The embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and do not limit the present invention. In each figure, dimensions etc. are not strictly illustrated.
　以下の説明及び図面中において、蓄電装置の外装体における本体部と外蓋との並び方向、または、蓄電装置に備わる複数の蓄電素子の並び方向をＸ軸方向と定義する。蓄電素子の各リード端子の突出方向をＹ軸方向と定義する。蓄電素子に備わる一対のリード端子の並び方向、または、上下方向をＺ軸方向と定義する。これらＸ軸方向、Ｙ軸方向及びＺ軸方向は、互いに交差（以下実施の形態及びその変形例では、直交する方向である。Ｘ軸方向は第三方向に対応し、Ｙ軸方向は第一方向に対応し、Ｚ軸方向は第二方向に対応する。なお、使用態様によってはＺ軸方向が上下方向にならない場合も考えられるが、以下では説明の便宜のため、Ｚ軸方向を上下方向として説明する。以下の説明において、Ｘ軸プラス方向とは、Ｘ軸の矢印方向側を示し、Ｘ軸マイナス方向とは、Ｘ軸プラス方向とは反対側を示す。Ｙ軸方向及びＺ軸方向についても同様である。平行及び直交などの、相対的な方向または姿勢を示す表現は、厳密には、その方向または姿勢ではない場合も含む。２つの方向が直交している、とは、当該２つの方向が完全に直交していることを意味するだけでなく、実質的に直交していること、すなわち、数％程度の差異を含むことも意味する。以下の説明において、「絶縁」と表現する場合、「電気的な絶縁」を意味する。 In the following description and drawings, the direction in which the main body and the outer cover of the exterior body of the power storage device are lined up, or the direction in which the plurality of power storage elements included in the power storage device are lined up is defined as the X-axis direction. The protruding direction of each lead terminal of the power storage element is defined as the Y-axis direction. The direction in which a pair of lead terminals provided on a power storage element are lined up or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction intersect with each other (in the following embodiments and modifications thereof, they are orthogonal directions. The X-axis direction corresponds to the third direction, and the Y-axis direction corresponds to the first direction. The Z-axis direction corresponds to the second direction. Depending on the usage, the Z-axis direction may not be the vertical direction, but for convenience of explanation below, the Z-axis direction will be referred to as the vertical direction. In the following description, the X-axis plus direction refers to the direction of the X-axis in the arrow direction, and the X-axis minus direction refers to the side opposite to the X-axis plus direction.Y-axis direction and Z-axis direction The same applies to expressions that indicate relative directions or orientations, such as parallel and orthogonal, even when the directions or orientations are not strictly speaking.Two directions are orthogonal to each other It does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of a few percent.In the following explanation, "insulation" When expressed, it means "electrical insulation."
　［蓄電装置の全般的な説明］
　図１及び図２を用いて、実施の形態に係る蓄電装置１の全般的な説明を行う。図１は、実施の形態に係る蓄電装置１の外観を示す斜視図である。図２は、実施の形態に係る蓄電装置１を分解した場合の各構成要素を示す分解斜視図である。 [General explanation of power storage device]
A general description of the power storage device 1 according to the embodiment will be given using FIGS. 1 and 2. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 1 according to the embodiment is disassembled.
　蓄電装置１は、外部からの電気を充電し、また外部へ電気を放電できる装置であり、本実施の形態では、略直方体形状を有している。蓄電装置１は、電力貯蔵用途または電源用途等に使用される電池モジュール（組電池）である。具体的には、蓄電装置１は、自動車、自動二輪車、ウォータークラフト、船舶、スノーモービル、農業機械、建設機械、電気鉄道用の鉄道車両等の移動体の駆動用またはエンジン始動用等のバッテリ等として用いられる。上記の自動車としては、電気自動車（ＥＶ）、ハイブリッド電気自動車（ＨＥＶ）、プラグインハイブリッド電気自動車（ＰＨＥＶ）、及び、化石燃料（ガソリン、軽油、液化天然ガス等）自動車が例示される。上記の電気鉄道用の鉄道車両としては、電車、モノレール、リニアモーターカー、並びに、ディーゼル機関及び電気モーターの両方を備えるハイブリッド電車が例示される。また、蓄電装置１は、家庭用または事業用等に使用される定置用のバッテリ等としても用いることができる。 The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment. The power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like. Specifically, the power storage device 1 is a battery for driving or starting an engine of a moving object such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. used as. Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. Furthermore, the power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
　図１及び図２に示すように、蓄電装置１は、蓄電ユニット２０と、蓄電ユニット２０を収容する外装体１０とを備えている。外装体１０は、蓄電ユニット２０を収容する本体部１１と、本体部１１を塞ぐ外蓋１２とを有する。 As shown in FIGS. 1 and 2, the power storage device 1 includes a power storage unit 20 and an exterior body 10 that houses the power storage unit 20. Exterior body 10 includes a main body 11 that accommodates power storage unit 20 and an outer lid 12 that covers main body 11 .
　外装体１０は、蓄電装置１の外装体を構成する矩形状（箱状）の容器（モジュールケース）である。つまり、外装体１０は、蓄電ユニット２０等を所定の位置に固定し、これら要素を衝撃などから保護する部材である。 The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1. In other words, the exterior body 10 is a member that fixes the power storage unit 20 and the like in a predetermined position and protects these elements from impact and the like.
　本体部１１は、Ｘ軸プラス方向が開放された有底矩形筒状の部材であり、その開放部分が開口部１１１である。開口部１１１は、平面視（Ｘ軸方向視）において略四角形状である。本体部１１の開口部１１１内には、蓄電ユニット２０に加えて、蓄電ユニット２０に保持された複数のバスバー（図示省略）及びヒューズ（図示省略）が収容されている。 The main body portion 11 is a bottomed rectangular cylindrical member that is open in the positive direction of the X-axis, and the open portion is the opening 111. The opening 111 has a substantially rectangular shape in plan view (as viewed in the X-axis direction). In addition to the power storage unit 20, a plurality of bus bars (not shown) and fuses (not shown) held by the power storage unit 20 are accommodated in the opening 111 of the main body 11.
　外蓋１２は、本体部１１の開口部１１１を閉塞する部材であり、本体部１１の開口部１１１をＸ軸プラス方向から塞いだ状態で本体部１１に接合されている。開口部１１１外における外蓋１２に対応する位置には制御基板３５が配置されている。つまり、本体部１１と外蓋１２との間には制御基板３５が収容されている。外蓋１２は、一対（正極及び負極）の外部端子８１を有している。外部端子８１は、各バスバー、ヒューズ及び制御基板３５を介して、蓄電ユニット２０に含まれる複数の蓄電素子２１と電気的に接続されている。蓄電装置１は、この外部端子８１を介して、外部からの電気を充電し、また外部へ電気を放電する。外部端子８１は、真鍮などの銅合金、銅、アルミニウム、アルミニウム合金等の金属製の導電部材で形成されている。 The outer cover 12 is a member that closes the opening 111 of the main body 11, and is joined to the main body 11 in a state where the opening 111 of the main body 11 is closed from the X-axis positive direction. A control board 35 is arranged outside the opening 111 at a position corresponding to the outer lid 12. That is, the control board 35 is housed between the main body part 11 and the outer cover 12. The outer lid 12 has a pair of external terminals 81 (a positive electrode and a negative electrode). External terminal 81 is electrically connected to a plurality of power storage elements 21 included in power storage unit 20 via each bus bar, fuse, and control board 35 . Power storage device 1 charges electricity from the outside via this external terminal 81 and discharges electricity to the outside. The external terminal 81 is made of a conductive member made of metal such as a copper alloy such as brass, copper, aluminum, or an aluminum alloy.
　各バスバーは、外部端子８１と蓄電素子２１とを電気的に接続する板状部材である。各バスバーは、銅、銅合金、アルミニウム、アルミニウム合金等の金属製の導電部材で形成されている。 Each bus bar is a plate-like member that electrically connects the external terminal 81 and the power storage element 21. Each bus bar is formed of a conductive member made of metal such as copper, copper alloy, aluminum, or aluminum alloy.
　ヒューズは、定格以上の大電流から制御基板３５及び複数の蓄電素子２１等を保護する部材である。ヒューズは、定格以上の電流が流れると溶断することで電流の流れを遮断する。 The fuse is a member that protects the control board 35, the plurality of power storage elements 21, etc. from a large current exceeding the rated value. A fuse cuts off the flow of current by blowing when a current exceeding its rating flows.
　制御基板３５は、複数の電気部品（図示省略）を有し、これら複数の電気部品により、各蓄電素子２１の状態（温度、電圧、電流など）を検出する検出回路、及び、充電及び放電を制御する制御回路等が形成されている。 The control board 35 has a plurality of electrical components (not shown), and these electrical components serve as a detection circuit for detecting the state (temperature, voltage, current, etc.) of each power storage element 21, and for controlling charging and discharging. A control circuit and the like for control are formed.
　外装体１０の本体部１１及び外蓋１２は、ポリカーボネート（ＰＣ）、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリフェニレンエーテル（ＰＰＥ（変性ＰＰＥを含む））、ポリエチレンテレフタラート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエーテルサルフォン（ＰＥＳ）、ポリアミド（ＰＡ）、ＡＢＳ樹脂、若しくは、それらの複合材料等の絶縁部材、絶縁塗装をした金属等により形成されている。外装体１０は、これにより、蓄電素子２１等が外部の金属部材等に接触することを回避する。蓄電素子２１等の電気的絶縁性が保たれる構成であれば、外装体１０は、金属等の導電部材で形成されてもよい。 The main body 11 and outer lid 12 of the exterior body 10 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)). ), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES) ), polyamide (PA), ABS resin, or composite materials thereof, or metal coated with insulation. The exterior body 10 thereby prevents the power storage element 21 and the like from coming into contact with external metal members and the like. The exterior body 10 may be formed of a conductive member such as metal, as long as the electrical insulation of the power storage element 21 and the like is maintained.
　［蓄電ユニット］
　蓄電ユニット２０は、複数の蓄電素子２１と、これらの複数の蓄電素子２１を保持する保持部２２とを備えている。 [Electricity storage unit]
The power storage unit 20 includes a plurality of power storage elements 21 and a holding section 22 that holds the plurality of power storage elements 21.
　蓄電素子２１は、電気を充電し、また、電気を放電できる二次電池（単電池）であり、より具体的には、リチウムイオン二次電池等の非水電解質二次電池である。本実施の形態では、蓄電素子２１は、扁平な形状を有するパウチタイプの蓄電素子であり、複数（本実施の形態では、４個）のパウチタイプの蓄電素子２１がＸ軸方向に並んで配列されている。蓄電素子２１は、パウチタイプの蓄電素子ではなく、扁平な直方体形状（角形）、円柱形状、長円柱形状または楕円柱形状等の蓄電素子でもよく、その大きさ及び形状は限定されない。配列される蓄電素子２１の個数についても、特に限定されない。蓄電素子２１は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。蓄電素子２１は、二次電池ではなく、使用者が充電をしなくても蓄えられている電気を使用できる一次電池であってもよい。複数の蓄電素子２１は、Ｘ軸方向に配列されており、隣り合う蓄電素子２１同士が接着剤または両面テープにより接合されてもよいし、接合されなくてもよい。蓄電素子２１の詳細については後述する。 The power storage element 21 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In this embodiment, the power storage element 21 is a pouch-type power storage element having a flat shape, and a plurality of (four in this embodiment) pouch-type power storage elements 21 are arranged side by side in the X-axis direction. has been done. The power storage element 21 is not a pouch-type power storage element, but may be a flat rectangular parallelepiped (prismatic), cylindrical, long cylinder, or elliptical cylinder, and its size and shape are not limited. The number of power storage elements 21 arranged is also not particularly limited. The power storage element 21 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor. The power storage element 21 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. The plurality of power storage elements 21 are arranged in the X-axis direction, and adjacent power storage elements 21 may or may not be joined with adhesive or double-sided tape. Details of the power storage element 21 will be described later.
　保持部２２は、複数の蓄電素子２１を保持する部位である。保持部２２は、第一保持部材２３と、第一保持部材２３とともに複数の蓄電素子２１を保持する第二保持部材２４とを有している。具体的には、第一保持部材２３は、複数の蓄電素子２１のＸ軸マイナス方向に配置されており、複数の蓄電素子２１のうち、Ｘ軸マイナス方向の端部に配置された蓄電素子２１に接着剤または両面テープにより接合されている。第二保持部材２４は、複数の蓄電素子２１のＸ軸プラス方向に配置されており、複数の蓄電素子２１のうち、Ｘ軸プラス方向の端部に配置された蓄電素子２１に接着剤または両面テープにより接合されている。これにより、第一保持部材２３及び第二保持部材２４は、複数の蓄電素子２１をＸ軸方向で挟んで保持している。なお、第一保持部材２３及び第二保持部材２４の少なくとも一方は、蓄電素子２１に接合されなくてもよい。 The holding part 22 is a part that holds a plurality of power storage elements 21. The holding portion 22 includes a first holding member 23 and a second holding member 24 that holds the plurality of power storage elements 21 together with the first holding member 23. Specifically, the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21, and the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21. are joined with adhesive or double-sided tape. The second holding member 24 is arranged in the X-axis positive direction of the plurality of power storage elements 21, and is attached to the power storage element 21 arranged at the end of the plurality of power storage elements 21 in the X-axis positive direction with adhesive or double-sided adhesive. Joined with tape. Thereby, the first holding member 23 and the second holding member 24 hold the plurality of power storage elements 21 on both sides in the X-axis direction. Note that at least one of the first holding member 23 and the second holding member 24 does not need to be joined to the power storage element 21.
　第一保持部材２３及び第二保持部材２４は、ポリカーボネート（ＰＣ）、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリフェニレンエーテル（ＰＰＥ（変性ＰＰＥを含む））、ポリエチレンテレフタラート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエーテルサルフォン（ＰＥＳ）、ポリアミド（ＰＡ）、ＡＢＳ樹脂、それらの複合材料等の絶縁部材により形成されている。これにより、第一保持部材２３及び第二保持部材２４は、複数の蓄電素子２１が外部の金属部材等の導電部材と導通することを抑制するが、そのような必要がない場合等には、第一保持部材２３及び第二保持部材２４は、金属等の導電部材で形成されてもよい。 The first holding member 23 and the second holding member 24 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate. (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyamide (PA) ), ABS resin, and composite materials thereof. As a result, the first holding member 23 and the second holding member 24 prevent the plurality of power storage elements 21 from being electrically connected to a conductive member such as an external metal member. However, in cases where there is no such need, etc. The first holding member 23 and the second holding member 24 may be formed of a conductive member such as metal.
　第一保持部材２３は、Ｘ軸マイナス方向の端部の蓄電素子２１に重なる平板部２５と、平板部２５からＸ軸プラス方向に延びるバスバー支持部２６とを有している。バスバー支持部２６は、平板部２５のＹ軸マイナス方向、Ｚ軸マイナス方向の角部からＸ軸プラス方向に延びており、図示しないバスバーを支持している。 The first holding member 23 has a flat plate portion 25 that overlaps the power storage element 21 at the end in the negative direction of the X-axis, and a bus bar support portion 26 that extends from the flat plate portion 25 in the positive direction of the X-axis. The bus bar support section 26 extends from the corner of the flat plate section 25 in the Y-axis minus direction and the Z-axis minus direction in the X-axis plus direction, and supports a bus bar (not shown).
　第二保持部材２４は、Ｘ軸プラス方向の端部の蓄電素子２１に重なる基板支持部２７と、基板支持部２７からＸ軸マイナス方向に延びる検出線支持部２８とを有している。基板支持部２７は、制御基板３５を支持しており、当該制御基板３５を囲む囲壁２９を有している。また、基板支持部２７は、図示しないバスバー及びヒューズを支持している。 The second holding member 24 has a substrate support portion 27 that overlaps the power storage element 21 at the end in the X-axis positive direction, and a detection line support portion 28 that extends from the substrate support portion 27 in the X-axis negative direction. The board support part 27 supports the control board 35 and has a surrounding wall 29 surrounding the control board 35. Further, the substrate support section 27 supports a bus bar and a fuse (not shown).
　検出線支持部２８は、各蓄電素子２１の状態（温度、電圧、電流など）を検出するために、制御基板３５に接続された複数の検出線３６を支持する部位である。検出線支持部２８は、基板支持部２７のＹ軸マイナス方向の端部からＸ軸マイナス方向に延びている。 The detection line support part 28 is a part that supports a plurality of detection lines 36 connected to the control board 35 in order to detect the state (temperature, voltage, current, etc.) of each power storage element 21. The detection line support section 28 extends from the end of the substrate support section 27 in the Y-axis minus direction in the X-axis minus direction.
　［蓄電素子］
　蓄電素子２１の詳細について説明する。図３は、実施の形態に係る複数の蓄電素子２１のそれぞれを分離して示す斜視図である。複数の蓄電素子２１は、基本的な構造は同様であるものの、外形形状が部分的に異なる。具体的には、Ｘ軸マイナス方向から順に奇数番目の蓄電素子２１と、Ｘ軸マイナス方向から順に偶数番目の蓄電素子２１とで、外形形状が部分的に異なっている。つまり、奇数番目の蓄電素子２１同士は外形形状が同等であり、偶数番目の蓄電素子２１同士は外形形状が同等である。 [Electricity storage element]
Details of the power storage element 21 will be explained. FIG. 3 is a perspective view separately showing each of the plurality of power storage elements 21 according to the embodiment. Although the plurality of power storage elements 21 have the same basic structure, their external shapes are partially different. Specifically, the outer shapes of the odd-numbered power storage elements 21 in order from the X-axis negative direction and the even-numbered power storage elements 21 in order from the X-axis negative direction are partially different. In other words, the odd-numbered power storage elements 21 have the same outer shape, and the even-numbered power storage elements 21 have the same outer shape.
　蓄電素子２１の基本的な構造について説明する。蓄電素子２１は、外装フィルム２１０と、一対（正極及び負極）のリード端子２２０とを有し、外装フィルム２１０の内方には、電極体２１１、及び、電解液（非水電解質：図示せず）等が収容されている。当該電解液としては、蓄電素子２１の性能を損なうものでなければその種類に特に制限はなく、適宜公知の材料を用いることができる。 The basic structure of the power storage element 21 will be explained. The power storage element 21 has an exterior film 210 and a pair of lead terminals 220 (positive electrode and negative electrode), and inside the exterior film 210, an electrode body 211 and an electrolyte (non-aqueous electrolyte: not shown) are provided. ) etc. are accommodated. There is no particular restriction on the type of the electrolytic solution as long as it does not impair the performance of the power storage element 21, and any known material can be used as appropriate.
　外装フィルム２１０は、ラミネートフィルムで形成されたシート状の外装体であり、内部に電極体２１１及び電解液等を減圧状態で密閉して収容している。外装フィルム２１０は、矩形状の２枚のラミネートフィルムが、Ｘ軸方向に重ねられて構成されている。当該２枚のラミネートフィルムは、一対のリード端子２２０を挟んで熱溶着等により接合（シール）されている。２枚のラミネートフィルムにおいて、一対のリード端子２２０に対応しない箇所では、当該２枚のラミネートフィルム同士が熱溶着等により接合（シール）されている。ラミネートフィルムは、アルミニウム等の金属層と、ポリプロピレン（ＰＰ）またはポリエチレン（ＰＥ）等の樹脂層とを含む複数層からなるフレキシブルなフィルムであり、溶着箇所（シール部）には、樹脂層が配置されている。なお、外装フィルム２１０は、１枚のラミネートフィルムを袋状に形成して、当該ラミネートフィルムの端部同士を熱溶着により接合することで構成されてもよい。 The exterior film 210 is a sheet-like exterior body formed of a laminate film, and contains the electrode body 211, electrolyte, etc. therein in a sealed state under reduced pressure. The exterior film 210 is constructed by stacking two rectangular laminate films in the X-axis direction. The two laminate films are joined (sealed) by thermal welding or the like with a pair of lead terminals 220 in between. In the two laminate films, at locations that do not correspond to the pair of lead terminals 220, the two laminate films are joined (sealed) to each other by thermal welding or the like. Laminate film is a flexible film consisting of multiple layers including a metal layer such as aluminum and a resin layer such as polypropylene (PP) or polyethylene (PE). has been done. Note that the exterior film 210 may be constructed by forming a single laminate film into a bag shape and joining the ends of the laminate film together by thermal welding.
　リード端子２２０は、電極体２１１に電気的に接続された導電性の板状部材（リード板）であり、外装フィルム２１０を貫通した状態で外装フィルム２１０から露出して配置されている。本実施の形態では、Ｚ軸方向に並ぶ一対のリード端子２２０が、外装フィルム２１０のＹ軸マイナス方向の端部からＹ軸マイナス方向に突出して配置されている。具体的には、正極のリード端子２２０は、電極体２１１の正極板に電気的に接続されたリード端子であり、負極のリード端子２２０は、電極体２１１の負極板に電気的に接続されたリード端子である。リード端子２２０は、電極体２１１に蓄えられている電気を蓄電素子２１の外部空間に導出し、また、電極体２１１に電気を蓄えるために蓄電素子２１の内部空間に電気を導入するための金属製の電極端子である。リード端子２２０は、アルミニウム、アルミニウム合金、銅、銅合金等で形成されている。 The lead terminal 220 is a conductive plate-like member (lead plate) electrically connected to the electrode body 211, and is disposed so as to penetrate through the exterior film 210 and be exposed from the exterior film 210. In this embodiment, a pair of lead terminals 220 aligned in the Z-axis direction are arranged to protrude in the Y-axis minus direction from the end of the exterior film 210 in the Y-axis minus direction. Specifically, the positive lead terminal 220 is a lead terminal electrically connected to the positive plate of the electrode body 211, and the negative lead terminal 220 is a lead terminal electrically connected to the negative plate of the electrode body 211. It is a lead terminal. The lead terminal 220 is a metal terminal for leading the electricity stored in the electrode body 211 to the external space of the electricity storage element 21 and for introducing electricity into the internal space of the electricity storage element 21 in order to store electricity in the electrode body 211. It is an electrode terminal made by. The lead terminal 220 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
　電極体２１１は、正極板と負極板とセパレータとが積層されて形成された蓄電要素（発電要素）である。正極板は、アルミニウムまたはアルミニウム合金等の金属からなる集電箔上に正極活物質層が形成されたものである。負極板は、銅または銅合金等の金属からなる集電箔上に負極活物質層が形成されたものである。正極活物質層及び負極活物質層に用いられる活物質としては、リチウムイオンを吸蔵放出可能なものであれば、適宜公知の材料を使用できる。セパレータは、樹脂からなる微多孔性のシートまたは不織布等を用いることができる。本実施の形態では、電極体２１１は、極板（正極板及び負極板）がＸ軸方向に積層されて形成されている。なお、電極体２１１は、極板（正極板及び負極板）が巻回されて形成された巻回型の電極体、複数の平板状の極板が積層されて形成された積層型（スタック型）の電極体、極板を蛇腹状に折り畳んだ蛇腹型の電極体等、どのような形態の電極体でもよい。 The electrode body 211 is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate has a positive electrode active material layer formed on a current collector foil made of metal such as aluminum or aluminum alloy. The negative electrode plate has a negative electrode active material layer formed on a current collector foil made of metal such as copper or copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. As the separator, a microporous sheet made of resin, a nonwoven fabric, or the like can be used. In this embodiment, the electrode body 211 is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the X-axis direction. The electrode body 211 may be a wound type electrode body formed by winding electrode plates (a positive electrode plate and a negative electrode plate), or a laminated type (stack type) formed by laminating a plurality of flat electrode plates. ), a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape, or any other form of electrode body may be used.
　奇数番目の蓄電素子２１と、偶数番目の蓄電素子２１との違いについて説明する。 The difference between the odd-numbered power storage elements 21 and the even-numbered power storage elements 21 will be explained.
　奇数番目の蓄電素子２１と、偶数番目の蓄電素子２１との共通な構成として、外装フィルム２１０は、電極体２１１に重なる本体フィルム２１２と、本体フィルム２１２の全周縁から外方に向けて突出した枠部２１３とを有している。本体フィルム２１２は、電極体２１１の各側面に重なっている。枠部２１３は、シート状の部位であり、Ｘ軸方向から見た場合に矩形状に形成されている。枠部２１３のうち、Ｙ軸マイナス方向の端縁である第一辺２１４からは、一対のリード端子２２０がＹ軸マイナス方向に突出し、互いに逆方向となるようにＸ軸方向（第三方向）に折り曲げられている。各リード端子２２０は、外装フィルム２１０の第一辺２１４の近傍で折り曲げられている。第一辺２１４から各リード端子２２０の先端までの長さを突出長さとすると、各リード端子２２０は、第一辺２１４から突出長さの１／３以内の範囲で折り曲げられているとよい。各リード端子２２０において、折り曲げ位置を基準に本体フィルム２１２よりも遠い部分を先端部２３０と称す。 As a common configuration of the odd-numbered power storage elements 21 and the even-numbered power storage elements 21, the exterior film 210 includes a main body film 212 that overlaps the electrode body 211, and a body film 212 that protrudes outward from the entire periphery of the main body film 212. It has a frame portion 213. The main body film 212 overlaps each side of the electrode body 211. The frame portion 213 is a sheet-like portion, and is formed in a rectangular shape when viewed from the X-axis direction. A pair of lead terminals 220 protrude in the negative Y-axis direction from the first side 214, which is the edge in the negative Y-axis direction, of the frame portion 213, and extend in the X-axis direction (third direction) in opposite directions. It is folded into. Each lead terminal 220 is bent near the first side 214 of the exterior film 210. Assuming that the length from the first side 214 to the tip of each lead terminal 220 is the protrusion length, each lead terminal 220 is preferably bent within 1/3 of the protrusion length from the first side 214. In each lead terminal 220, a portion farther from the main body film 212 with respect to the bending position is referred to as a tip portion 230.
　奇数番目の蓄電素子２１では、Ｚ軸プラス方向のリード端子２２１の先端部２３１がＸ軸マイナス方向に折り曲げられていて、Ｚ軸マイナス方向のリード端子２２２の先端部２３２がＸ軸プラス方向に折り曲げられている。これに対し、偶数番目の蓄電素子２１では、Ｚ軸プラス方向のリード端子２２１の先端部２３１がＸ軸プラス方向に折り曲げられていて、Ｚ軸マイナス方向のリード端子２２２の先端部２３２がＸ軸マイナス方向に折り曲げられている。 In the odd-numbered energy storage elements 21, the tip 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis minus direction, and the tip 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis plus direction. It is being On the other hand, in the even-numbered energy storage elements 21, the tip portion 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis plus direction, and the tip portion 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis minus direction. It is bent in the negative direction.
　奇数番目の蓄電素子２１と、偶数番目の蓄電素子２１との共通な構成として、枠部２１３のうち、本体フィルム２１２をＹ軸方向（第一方向）で挟む部位は、平坦状に形成されているのに対し、Ｚ軸方向（第二方向）で挟む部位は折り曲げられている。具体的には、枠部２１３のうち、本体フィルム２１２をＺ軸方向で挟む部位は、本体フィルム２１２のＺ軸方向の端縁から突出した一対の突出片２４０である。一対の突出片２４０は、Ｚ軸方向に突出し、互いに逆方向となるようにＸ軸方向に折り曲げられている。ここで、奇数番目の蓄電素子２１では、Ｚ軸プラス方向の突出片２４１がＸ軸プラス方向に折り曲げられていて、Ｚ軸マイナス方向の突出片２４２がＸ軸マイナス方向に折り曲げられている。つまり、奇数番目の蓄電素子２１では、一対のリード端子２２０のうち、一方のリード端子２２１と当該リード端子２２１に距離が近い突出片２４１とは互いに逆方向に折り曲げられている。奇数番目の蓄電素子２１では、他方のリード端子２２２と当該リード端子２２２に距離が近い突出片２４２とは互いに逆方向に折り曲げられている。 As a common configuration of the odd-numbered power storage elements 21 and the even-numbered power storage elements 21, the portions of the frame portion 213 that sandwich the main body film 212 in the Y-axis direction (first direction) are formed in a flat shape. On the other hand, the portion sandwiched in the Z-axis direction (second direction) is bent. Specifically, the portions of the frame portion 213 that sandwich the main body film 212 in the Z-axis direction are a pair of protruding pieces 240 that protrude from the edges of the main body film 212 in the Z-axis direction. The pair of protruding pieces 240 protrude in the Z-axis direction and are bent in the X-axis direction in opposite directions. Here, in the odd-numbered power storage elements 21, the protruding piece 241 in the positive direction of the Z-axis is bent in the positive direction of the X-axis, and the protruding piece 242 in the negative direction of the Z-axis is bent in the negative direction of the X-axis. That is, in the odd-numbered power storage elements 21, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions. In odd-numbered power storage elements 21, the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
　偶数番目の蓄電素子２１では、Ｚ軸プラス方向の突出片２４１がＸ軸マイナス方向に折り曲げられていて、Ｚ軸マイナス方向の突出片２４２がＸ軸プラス方向に折り曲げられている。偶数番目の蓄電素子２１においても、一対のリード端子２２０のうち、一方のリード端子２２１と当該リード端子２２１に距離が近い突出片２４１とは互いに逆方向に折り曲げられている。偶数番目の蓄電素子２１では、他方のリード端子２２２と当該リード端子２２２に距離が近い突出片２４２とは互いに逆方向に折り曲げられている。 In the even-numbered power storage elements 21, the protruding pieces 241 in the positive direction of the Z-axis are bent in the negative direction of the X-axis, and the protruding pieces 242 in the negative direction of the Z-axis are bent in the positive direction of the X-axis. Also in the even-numbered power storage elements 21, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions. In the even-numbered power storage elements 21, the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
　各蓄電素子２１のリード端子２２０は、他の蓄電素子２１のリード端子２２０またはバスバーに接合される。具体的には、一番目の蓄電素子２１のリード端子２２１は、先端部２３１が図示しないバスバーに溶接される。一番目の蓄電素子２１のリード端子２２２と、二番目の蓄電素子２１のリード端子２２２とは、先端部２３２同士が溶接される。二番目の蓄電素子２１のリード端子２２１と、三番目の蓄電素子２１のリード端子２２１とは、先端部２３１同士が溶接される。三番目の蓄電素子２１のリード端子２２２と、四番目の蓄電素子２１のリード端子２２２とは、先端部２３２同士が溶接される。四番目の蓄電素子２１のリード端子２２１は、先端部２３１が、図示しない他のバスバーに溶接される。 The lead terminal 220 of each power storage element 21 is joined to the lead terminal 220 of another power storage element 21 or a bus bar. Specifically, the lead terminal 221 of the first power storage element 21 has a tip 231 welded to a bus bar (not shown). The lead terminals 222 of the first power storage element 21 and the lead terminals 222 of the second power storage element 21 are welded at their tip portions 232 to each other. The lead terminals 221 of the second power storage element 21 and the lead terminals 221 of the third power storage element 21 are welded at their tip portions 231 to each other. The lead terminals 222 of the third power storage element 21 and the lead terminals 222 of the fourth power storage element 21 are welded at their tip portions 232 to each other. A leading end 231 of the lead terminal 221 of the fourth power storage element 21 is welded to another bus bar (not shown).
　［リード端子の溶接方法］
　隣り合う蓄電素子２１のリード端子２２０同士の溶接方法について説明する。図４は、実施の形態に係る溶接方法を示すための説明図である。ここでは、Ｘ軸マイナス方向から二番目の蓄電素子２１（図４中、中央の蓄電素子２１）を例示して説明する。 [How to weld lead terminals]
A method of welding lead terminals 220 of adjacent power storage elements 21 together will be described. FIG. 4 is an explanatory diagram showing the welding method according to the embodiment. Here, the second power storage element 21 from the negative direction of the X-axis (center power storage element 21 in FIG. 4) will be described as an example.
　上述したように、二番目の蓄電素子２１のリード端子２２１と、三番目の蓄電素子２１のリード端子２２１とは、先端部２３１同士が溶接され、二番目の蓄電素子２１のリード端子２２２と、一番目の蓄電素子２１のリード端子２２２とは、先端部２３２同士が溶接される。この溶接には、超音波溶接、抵抗溶接、レーザ溶接などの溶接方法が用いられる。いずれの溶接方法においても、先端部２３０同士を溶接するための溶接治具が、重なり合った先端部２３０同士に向けて進退するようになっている。図４では、先端部２３０同士に向けて溶接治具が移動する経路を矢印Ｙ１、Ｙ２で示している。 As described above, the lead terminals 221 of the second power storage element 21 and the lead terminals 221 of the third power storage element 21 are welded at their tips 231, and the lead terminals 222 of the second power storage element 21, Lead terminals 222 of the first power storage element 21 are welded together at their tip portions 232 . Welding methods such as ultrasonic welding, resistance welding, and laser welding are used for this welding. In either welding method, a welding jig for welding the tip portions 230 together moves forward and backward toward the overlapping tip portions 230. In FIG. 4, arrows Y1 and Y2 indicate paths along which the welding jig moves toward the tips 230.
　二番目の蓄電素子２１のリード端子２２１と、三番目の蓄電素子２１のリード端子２２１との先端部２３１同士に着目する。当該先端部２３１同士のＺ軸プラス方向では、二番目の蓄電素子２１の突出片２４１がＸ軸マイナス方向に折り曲げられて、三番目の蓄電素子２１の突出片２４１がＸ軸プラス方向に折り曲げられている。つまり、当該先端部２３１同士のＺ軸プラス方向は開放されている。このため、当該先端部２３１同士のＺ軸プラス方向の開放部分から溶接治具を進入させたとしても、先端部２３１同士または各突出片２４１に干渉させることなく、先端部２３１同士まで溶接治具を移動させることができる（矢印Ｙ１）。このとき、先端部２３１同士に対して、距離の近い方の突出片２４１から溶接治具を進入させることができるので、溶接治具の移動距離を抑制できる。進入後においては、溶接治具は、先端部２３１同士をＹ軸方向で挟んだ位置から溶接を実行する。 Attention is paid to the tips 231 of the lead terminal 221 of the second power storage element 21 and the lead terminal 221 of the third power storage element 21. In the Z-axis positive direction of the tip portions 231, the protruding piece 241 of the second power storage element 21 is bent in the X-axis negative direction, and the protruding piece 241 of the third power storage element 21 is bent in the X-axis positive direction. ing. In other words, the tips 231 are open in the positive Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 231 in the Z-axis plus direction, the welding jig will not interfere with the tip portions 231 or each protruding piece 241, and the welding jig will not interfere with the tip portions 231 or each protruding piece 241. can be moved (arrow Y1). At this time, since the welding jig can enter the tip portions 231 from the protrusion piece 241 that is closer to each other, the moving distance of the welding jig can be suppressed. After entering, the welding jig performs welding from the position where the tip portions 231 are sandwiched between each other in the Y-axis direction.
　二番目の蓄電素子２１のリード端子２２２と、一番目の蓄電素子２１のリード端子２２２との先端部２３２同士に着目する。当該先端部２３２同士のＺ軸マイナス方向では、二番目の蓄電素子２１の突出片２４２がＸ軸プラス方向に折り曲げられて、一番目の蓄電素子２１の突出片２４２がＸ軸マイナス方向に折り曲げられている。つまり、当該先端部２３２同士のＺ軸マイナス方向は開放されている。このため、当該先端部２３２同士のＺ軸マイナス方向の開放部分から溶接治具を進入させたとしても、先端部２３２同士または各突出片２４２に干渉させることなく、先端部２３２同士まで溶接治具を移動させることができる（矢印Ｙ２）。このとき、先端部２３２同士に対して、距離の近い方の突出片２４２から溶接治具を進入させることができるので、溶接治具の移動距離を抑制できる。進入後においては、溶接治具は、先端部２３２同士をＹ軸方向で挟んだ位置から溶接を実行する。 Attention is paid to the tips 232 of the lead terminal 222 of the second power storage element 21 and the lead terminal 222 of the first power storage element 21. In the Z-axis negative direction between the tips 232, the protruding piece 242 of the second power storage element 21 is bent in the X-axis positive direction, and the protruding piece 242 of the first power storage element 21 is bent in the X-axis negative direction. ing. In other words, the tips 232 are open in the negative Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 232 in the negative Z-axis direction, the welding jig can reach the tip portions 232 without interfering with the tip portions 232 or each protruding piece 242. can be moved (arrow Y2). At this time, since the welding jig can enter the tip portions 232 from the protrusion piece 242 that is closer to each other, the moving distance of the welding jig can be suppressed. After entering, the welding jig performs welding from the position where the tip portions 232 are sandwiched between each other in the Y-axis direction.
　［効果など］
　以上のように、本実施の形態によれば、外装フィルム２１０のＹ軸方向（第一方向）の端縁から突出した一対のリード端子２２０が互いに逆方向に折り曲げられていて、Ｚ軸方向（第二方向）の端縁から突出した一対の突出片２４０も互いに逆方向に折り曲げられている。このため、いずれのリード端子２２０においても、Ｚ軸方向の一方が突出片２４０で覆われないこととなる。これにより、溶接治具を、Ｚ軸方向で突出片２４０に覆われていない部位からリード端子２２０まで進入させることができる。したがって、外装フィルム２１０の突出片２４０またはリード端子２２０と溶接治具との干渉を抑制でき、溶接作業の円滑性を高めることができる。 [Effects etc.]
As described above, according to the present embodiment, the pair of lead terminals 220 protruding from the edges of the exterior film 210 in the Y-axis direction (first direction) are bent in opposite directions, and A pair of protruding pieces 240 protruding from the edge in the second direction) are also bent in opposite directions. Therefore, one side of each lead terminal 220 in the Z-axis direction is not covered by the protruding piece 240. This allows the welding jig to enter the lead terminal 220 from a portion not covered by the protruding piece 240 in the Z-axis direction. Therefore, interference between the protruding piece 240 of the exterior film 210 or the lead terminal 220 and the welding jig can be suppressed, and the smoothness of the welding work can be improved.
　一方のリード端子２２０と当該リード端子２２０に距離が近い突出片２４０とが互いに逆方向に折り曲げられているので、この距離が近い突出片２４０の方から溶接治具を進入させることができる。同様に、他方のリード端子２２０と当該リード端子２２０に距離が近い突出片２４０とが互いに逆方向に折り曲げられているので、この距離が近い突出片２４０の方から溶接治具を進入させることができる。したがって、溶接治具の移動距離を抑制しながらも、外装フィルム２１０の突出片２４０またはリード端子２２０と溶接治具との干渉を抑制できる。溶接治具の移動距離が抑制されるのであれば溶接時間も短縮化され、溶接作業の円滑性をより高めることが可能である。 Since one lead terminal 220 and the protruding piece 240 that is closer to the lead terminal 220 are bent in opposite directions, the welding jig can enter from the protruding piece 240 that is closer to the lead terminal 220. Similarly, since the other lead terminal 220 and the protruding piece 240 that is closer to the lead terminal 220 are bent in opposite directions, it is possible to enter the welding jig from the protruding piece 240 that is closer to the other lead terminal 220. can. Therefore, interference between the protruding piece 240 of the exterior film 210 or the lead terminal 220 and the welding jig can be suppressed while suppressing the moving distance of the welding jig. If the moving distance of the welding jig is suppressed, welding time can also be shortened, and it is possible to further improve the smoothness of welding work.
　第一辺２１４から一対のリード端子２２０が突出した蓄電素子２１においても、各リード端子２２０が互いに逆方向に折り曲げられて、各突出片２４０も互いに逆方向に折り曲げられている。このため、各リード端子２２０では、Ｚ軸方向の一方が突出片２４０で覆われないこととなる。したがって、第一辺２１４から一対のリード端子２２０が突出した蓄電素子２１であっても、溶接治具を、Ｚ軸方向で突出片２４０に覆われていない部位からリード端子２２０まで進入させることができ、外装フィルム２１０の突出片２４０またはリード端子２２０と溶接治具との干渉を抑制できる。 Even in the power storage element 21 in which a pair of lead terminals 220 protrude from the first side 214, each lead terminal 220 is bent in opposite directions, and each protruding piece 240 is also bent in opposite directions. Therefore, in each lead terminal 220, one side in the Z-axis direction is not covered by the protruding piece 240. Therefore, even if the power storage element 21 has a pair of lead terminals 220 protruding from the first side 214, the welding jig cannot enter the lead terminals 220 from a portion not covered by the protruding pieces 240 in the Z-axis direction. Therefore, interference between the protruding piece 240 of the exterior film 210 or the lead terminal 220 and the welding jig can be suppressed.
　各リード端子２２０が外装フィルム２１０の端縁近傍で折り曲げられていると、溶接治具を挿入するスペースが狭くなってしまい、溶接治具とリード端子２２０との干渉を誘発しやすい。本実施の形態であれば、溶接治具を、Ｚ軸方向で突出片２４０に覆われていない部位からリード端子２２０まで進入させることができるので、溶接治具との干渉を誘発しやすい折り曲げ構造であったとしても、当該干渉を抑制することができる。 If each lead terminal 220 is bent near the edge of the exterior film 210, the space into which the welding jig is inserted becomes narrow, which tends to cause interference between the welding jig and the lead terminals 220. In this embodiment, the welding jig can enter the lead terminal 220 from a portion not covered by the protruding piece 240 in the Z-axis direction, so the bending structure that is likely to cause interference with the welding jig is avoided. Even if it is, the interference can be suppressed.
　（変形例）
　以下に、上記実施の形態の各変形例について説明する。以降の説明において上記実施の形態または他の変形例と同一の部分においては同一の符号を付してその説明を省略する場合がある。 (Modified example)
Each modification of the above embodiment will be described below. In the following description, parts that are the same as those in the above embodiment or other modified examples may be given the same reference numerals, and the description thereof may be omitted.
　［変形例１］
　上記実施の形態では、外装フィルム２１０の第一辺２１４から一対のリード端子２２０が突出している場合を例示した。この変形例１では、外装フィルムの第一辺と、当該第一辺とは反対側の第二辺とのそれぞれから各リード端子が突出している場合について説明する。図５は、変形例１に係る蓄電素子２１ａを示す模式図である。図５は、図４に対応する図である。 [Modification 1]
In the embodiment described above, the case where the pair of lead terminals 220 protrudes from the first side 214 of the exterior film 210 is illustrated. In this first modification, a case will be described in which each lead terminal protrudes from each of the first side of the exterior film and the second side opposite to the first side. FIG. 5 is a schematic diagram showing a power storage element 21a according to modification example 1. FIG. 5 is a diagram corresponding to FIG. 4.
　図５に示すように、各蓄電素子２１ａは、リード端子２２１が外装フィルム２１０の第一辺２１４からＹ軸マイナス方向に突出してから折り曲げられ、リード端子２２２ａが外装フィルム２１０の第二辺（図５では、第一辺２１４の奥側に配置されている。）からＹ軸プラス方向に突出してから折り曲げられている。このため、図５では、リード端子２２２ａの基部は、本体フィルム２１２に隠されているため破線で図示している。 As shown in FIG. 5, each power storage element 21a has a lead terminal 221 protruding from the first side 214 of the exterior film 210 in the negative Y-axis direction and then being bent, and a lead terminal 222a on the second side of the exterior film 210 (see FIG. 5, it is placed on the back side of the first side 214.) and is bent in the Y-axis plus direction. For this reason, in FIG. 5, the base of the lead terminal 222a is hidden by the main body film 212 and is therefore shown with a broken line.
　この場合においても、二番目の蓄電素子２１ａのリード端子２２１と、三番目の蓄電素子２１ａのリード端子２２１との先端部２３１同士では、そのＺ軸プラス方向が開放されている。このため、当該先端部２３１同士のＺ軸プラス方向の開放部分から溶接治具を進入させたとしても、先端部２３１同士または各突出片２４１に干渉させることなく、先端部２３１同士まで溶接治具を移動させることができる（矢印Ｙ３）。 In this case as well, the leading ends 231 of the lead terminal 221 of the second power storage element 21a and the lead terminal 221 of the third power storage element 21a are open in the Z-axis positive direction. Therefore, even if the welding jig enters from the open part of the tip portions 231 in the Z-axis plus direction, the welding jig will not interfere with the tip portions 231 or each protruding piece 241, and the welding jig will not interfere with the tip portions 231 or each protruding piece 241. can be moved (arrow Y3).
　同様に、二番目の蓄電素子２１ａのリード端子２２２ａと、一番目の蓄電素子２１ａのリード端子２２２ａとの先端部２３２では、そのＺ軸マイナス方向が開放されている。このため、当該先端部２３２同士のＺ軸マイナス方向の開放部分から溶接治具を進入させたとしても、先端部２３２同士または各突出片２４２に干渉させることなく、先端部２３２同士まで溶接治具を移動させることができる（矢印Ｙ４）。 Similarly, the tips 232 of the lead terminal 222a of the second power storage element 21a and the lead terminal 222a of the first power storage element 21a are open in the negative Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 232 in the negative Z-axis direction, the welding jig can reach the tip portions 232 without interfering with the tip portions 232 or each protruding piece 242. can be moved (arrow Y4).
　［変形例２］
　上記実施の形態では、一方のリード端子２２０と当該リード端子２２０に距離が近い突出片２４０とが互いに逆方向に折り曲げられ、他方のリード端子２２０と当該リード端子２２０に距離が近い突出片２４０とが互いに逆方向に折り曲げられている場合を例示した。この変形例２では、一方のリード端子と当該リード端子に距離が遠い突出片とが互いに逆方向に折り曲げられ、他方のリード端子と当該リード端子に距離が遠い突出片とが互いに逆方向に折り曲げられている場合について説明する。図６は、変形例２に係る蓄電素子２１ｂを示す模式図である。図６は、図４に対応する図である。 [Modification 2]
In the embodiment described above, one lead terminal 220 and the protruding piece 240 that is close to the lead terminal 220 are bent in opposite directions, and the other lead terminal 220 and the protruding piece 240 that is close to the lead terminal 220 are bent in opposite directions. An example is shown in which the shapes are bent in opposite directions. In this modification 2, one lead terminal and the protruding piece that is far from the lead terminal are bent in opposite directions, and the other lead terminal and the protruding piece that is far from the lead terminal are bent in opposite directions. We will explain the case where FIG. 6 is a schematic diagram showing a power storage element 21b according to modification 2. FIG. 6 is a diagram corresponding to FIG. 4.
　図６に示すように、奇数番目の蓄電素子２１ｂでは、Ｚ軸プラス方向の突出片２４１ｂがＸ軸マイナス方向に折り曲げられていて、Ｚ軸マイナス方向の突出片２４２ｂがＸ軸プラス方向に折り曲げられている。つまり、奇数番目の蓄電素子２１ｂでは、一対のリード端子２２０のうち、一方のリード端子２２１と当該リード端子２２１に距離が遠い突出片２４２ｂとは互いに逆方向に折り曲げられている。奇数番目の蓄電素子２１ｂでは、他方のリード端子２２２と当該リード端子２２２に距離が遠い突出片２４１ｂとは互いに逆方向に折り曲げられている。 As shown in FIG. 6, in the odd-numbered energy storage element 21b, the protruding piece 241b in the positive direction of the Z-axis is bent in the negative direction of the X-axis, and the protruding piece 242b in the negative direction of the Z-axis is bent in the positive direction of the X-axis. ing. That is, in the odd-numbered power storage element 21b, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 242b that is far from the lead terminal 221 are bent in opposite directions. In odd-numbered power storage elements 21b, the other lead terminal 222 and the protruding piece 241b that is far from the lead terminal 222 are bent in opposite directions.
　偶数番目の蓄電素子２１ｂでは、Ｚ軸プラス方向の突出片２４１ｂがＸ軸プラス方向に折り曲げられていて、Ｚ軸マイナス方向の突出片２４２ｂがＸ軸マイナス方向に折り曲げられている。偶数番目の蓄電素子２１ｂにおいても、一対のリード端子２２０のうち、一方のリード端子２２１と当該リード端子２２１に距離が遠い突出片２４２ｂとは互いに逆方向に折り曲げられている。偶数番目の蓄電素子２１ｂでは、他方のリード端子２２２と当該リード端子２２２に距離が遠い突出片２４１ｂとは互いに逆方向に折り曲げられている。 In the even-numbered power storage elements 21b, the protruding pieces 241b in the positive direction of the Z-axis are bent in the positive direction of the X-axis, and the protruding pieces 242b in the negative direction of the Z-axis are bent in the negative direction of the X-axis. Also in the even-numbered power storage elements 21b, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 242b that is far from the lead terminal 221 are bent in opposite directions. In the even-numbered power storage elements 21b, the other lead terminal 222 and the protruding piece 241b that is far away from the lead terminal 222 are bent in opposite directions.
　この場合、二番目の蓄電素子２１ｂのリード端子２２１と、三番目の蓄電素子２１ｂのリード端子２２１との先端部２３１同士では、そのＺ軸マイナス方向が開放されている。このため、当該先端部２３１同士のＺ軸マイナス方向の開放部分から溶接治具を進入させたとしても、先端部２３１同士または各突出片２４２ｂに干渉させることなく、先端部２３１同士まで溶接治具を移動させることができる（矢印Ｙ５）。 In this case, the leading ends 231 of the lead terminal 221 of the second power storage element 21b and the lead terminal 221 of the third power storage element 21b are open in the negative Z-axis direction. Therefore, even if the welding jig enters from the open part of the tip portions 231 in the negative Z-axis direction, the welding jig will not interfere with the tip portions 231 or each protruding piece 242b, and the welding jig will not interfere with the tip portions 231 or each protruding piece 242b. can be moved (arrow Y5).
　同様に、二番目の蓄電素子２１ｂのリード端子２２２と、一番目の蓄電素子２１ｂのリード端子２２２との先端部２３２では、そのＺ軸プラス方向が開放されている。このため、当該先端部２３２同士のＺ軸プラス方向の開放部分から溶接治具を進入させたとしても、先端部２３２同士または各突出片２４１ｂに干渉させることなく、先端部２３２同士まで溶接治具を移動させることができる（矢印Ｙ６）。 Similarly, the tips 232 of the lead terminal 222 of the second power storage element 21b and the lead terminal 222 of the first power storage element 21b are open in the Z-axis positive direction. Therefore, even if the welding jig enters from the open part of the tip portions 232 in the Z-axis plus direction, the welding jig can reach the tip portions 232 without interfering with the tip portions 232 or each protruding piece 241b. can be moved (arrow Y6).
　一方のリード端子及び当該一方のリード端子とは逆方向に折り曲げられる突出片の距離と、他方のリード端子及び当該他方のリード端子とは逆方向に折り曲げられる突出片の距離とは同じでもよい。 The distance between one lead terminal and the protruding piece that is bent in the opposite direction to the one lead terminal may be the same as the distance between the other lead terminal and the protruding piece that is bent in the opposite direction to the other lead terminal.
　［変形例３］
　変形例３では、外装フィルムにおいて第一辺から本体フィルムまでの第一間隔と、第一辺とは反対側の第二辺から本体フィルムまでの第二間隔との好適な関係性について説明する。図７は、変形例３に係る蓄電素子２１ｃを示す平面図である。 [Modification 3]
In modification 3, a suitable relationship between the first distance from the first side to the main body film in the exterior film and the second distance from the second side opposite to the first side to the main body film will be described. FIG. 7 is a plan view showing a power storage element 21c according to modification 3.
　図７に示すように、蓄電素子２１ｃの外装フィルム２１０ｃでは、第一辺２１４ｃから本体フィルム２１２ｃまでの第一間隔Ｓ１は、第一辺２１４ｃとは反対側の第二辺２１５ｃから本体フィルム２１２ｃまでの第二間隔Ｓ２よりも大きい。このように、一対のリード端子２２０が突出している第一辺２１４ｃから本体フィルム２１２ｃまでの第一間隔Ｓ１が、反対側の第二間隔Ｓ２よりも大きいので、蓄電素子２１ｃを制御するための制御基板などを、余剰空間である第一間隔Ｓ１上に配置することができる。制御基板は、一対のリード端子２２０に電気的に接続されるので、第一間隔Ｓ１に配置されるのであれば、配線構造を簡素化することも可能である。なお、第二間隔が第一間隔よりも広くてもよいし、第一間隔と第二間隔とが同じでもよい。 As shown in FIG. 7, in the exterior film 210c of the power storage element 21c, the first interval S1 from the first side 214c to the main body film 212c is the distance from the second side 215c on the opposite side to the first side 214c to the main body film 212c. is larger than the second interval S2. In this way, since the first distance S1 from the first side 214c from which the pair of lead terminals 220 protrudes to the main body film 212c is larger than the second distance S2 on the opposite side, control for controlling the power storage element 21c is performed. A substrate or the like can be placed on the first spacing S1, which is the surplus space. Since the control board is electrically connected to the pair of lead terminals 220, the wiring structure can be simplified if it is arranged at the first interval S1. Note that the second interval may be wider than the first interval, or the first interval and the second interval may be the same.
　（その他）
　以上、本発明の実施の形態に係る蓄電装置及び蓄電素子について説明したが、本発明は、上記実施の形態に限定されるものではない。つまり、今回開示された実施の形態は、全ての点で例示であって制限的なものではなく、本発明の範囲には、請求の範囲と均等の意味及び範囲内での全ての変更が含まれる。 (others)
Although the power storage device and the power storage element according to the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. In other words, the embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all changes within the meaning and range equivalent to the scope of the claims. It will be done.
　上記実施の形態では、Ｘ軸方向から見た場合に矩形状の外装フィルム２１０を例示したが、外装フィルムの外形は如何様でもよい。外装フィルムのその他の外形としては、矩形以外の多角形状、長円状、楕円状、円形状などが挙げられる。 In the above embodiment, the exterior film 210 is rectangular when viewed from the X-axis direction, but the exterior film may have any shape. Other external shapes of the exterior film include polygonal shapes other than rectangular shapes, oval shapes, elliptical shapes, circular shapes, and the like.
　上記実施の形態では、リード端子２２０が外装フィルム２１０の端縁近傍で折り曲げられている場合を例示したが、リード端子は、外装フィルムの端縁近傍からより離れた位置で折り曲げられてもよい。 In the above embodiment, the lead terminal 220 is bent near the edge of the exterior film 210, but the lead terminal may be bent at a position further away from the vicinity of the edge of the exterior film.
　実施の形態及びその変形例に含まれる構成要素を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。 Embodiments constructed by arbitrarily combining components included in the embodiments and their modifications are also included within the scope of the present invention.
　本発明は、リチウムイオン二次電池などの蓄電素子等に適用できる。 The present invention can be applied to power storage elements such as lithium ion secondary batteries.
１　蓄電装置
１０　外装体
１１　本体部
１２　外蓋
２０　蓄電ユニット
２１、２１ａ、２１ｂ、２１ｃ　蓄電素子
２２　保持部
２３　第一保持部材
２４　第二保持部材
２５　平板部
２６　バスバー支持部
２７　基板支持部
２８　検出線支持部
２９　囲壁
３５　制御基板
３６　検出線
８１　外部端子
１１１　開口部
２１０、２１０ｃ　外装フィルム
２１１　電極体
２１２、２１２ｃ　本体フィルム
２１３　枠部
２１４、２１４ｃ　第一辺
２１５ｃ　第二辺
２２０、２２１、２２２、２２２ａ　リード端子
２３０、２３１、２３２　先端部
２４０、２４１、２４１ｂ、２４２、２４２ｂ　突出片
Ｓ１　第一間隔
Ｓ２　第二間隔
Ｙ１、Ｙ２、Ｙ３、Ｙ４、Ｙ５、Ｙ６　矢印 1 Power storage device 10 Exterior body 11 Main body 12 Outer cover 20 Power storage units 21, 21a, 21b, 21c Power storage element 22 Holding portion 23 First holding member 24 Second holding member 25 Flat plate portion 26 Bus bar support portion 27 Board support portion 28 Detection Line support section 29 Surrounding wall 35 Control board 36 Detection wire 81 External terminal 111 Openings 210, 210c Exterior film 211 Electrode body 212, 212c Main body film 213 Frame section 214, 214c First side 215c Second side 220, 221, 222, 222a Lead terminals 230, 231, 232 Tips 240, 241, 241b, 242, 242b Projecting piece S1 First interval S2 Second interval Y1, Y2, Y3, Y4, Y5, Y6 Arrow

Claims (6)

  1. 　電極体と、
    　前記電極体を覆う外装フィルムと、
    　前記電極体に接続されて前記外装フィルムの第一方向の端縁から突出した一対のリード端子と、を備え、
    　前記外装フィルムは、
    　前記電極体に重なる本体フィルムと、
    　前記本体フィルムの端縁であって、前記第一方向に交差する第二方向の端縁から突出した一対の突出片と、を備え、
    　前記一対のリード端子は、前記第一方向及び前記第二方向に交差する第三方向において互いに逆方向に折り曲げられており、
    　前記一対の突出片は、前記第三方向において互いに逆方向に折り曲げられている
    　蓄電素子。     an electrode body;
    an exterior film that covers the electrode body;
    a pair of lead terminals connected to the electrode body and protruding from an edge of the exterior film in the first direction,
    The exterior film is
    a main body film overlapping the electrode body;
    A pair of protruding pieces protruding from an edge of the main body film in a second direction intersecting the first direction,
    The pair of lead terminals are bent in opposite directions in a third direction intersecting the first direction and the second direction,
    The pair of protruding pieces are bent in opposite directions to each other in the third direction.
  2. 　前記一対のリード端子は、一方のリード端子と、他方のリード端子と、を有し、
    　前記一方のリード端子と前記一方のリード端子に距離が近い突出片とは、互いに逆方向に折り曲げられており、
    　前記他方のリード端子と前記他方のリード端子に距離が近い突出片とは、互いに逆方向に折り曲げられている
    　請求項１に記載の蓄電素子。     The pair of lead terminals has one lead terminal and the other lead terminal,
    The one lead terminal and the protruding piece that is close to the one lead terminal are bent in opposite directions,
    The electricity storage element according to claim 1, wherein the other lead terminal and the protruding piece that is close to the other lead terminal are bent in opposite directions.
  3. 　前記外装フィルムは前記第三方向から見た場合に矩形状であり、
    　前記一対のリード端子は、前記第三方向から見た場合において前記外装フィルムの第一辺から突出している
    　請求項１または２に記載の蓄電素子。     The exterior film has a rectangular shape when viewed from the third direction,
    The power storage element according to claim 1 or 2, wherein the pair of lead terminals protrudes from the first side of the exterior film when viewed from the third direction.
  4. 　前記外装フィルムは、前記第一方向において前記第一辺に対向する第二辺を有し、
    　前記第一辺から前記本体フィルムまでの第一間隔は、前記第二辺から前記本体フィルムまでの第二間隔よりも大きい
    　請求項３に記載の蓄電素子。     The exterior film has a second side opposite to the first side in the first direction,
    The electricity storage element according to claim 3, wherein a first distance from the first side to the main body film is larger than a second distance from the second side to the main body film.
  5. 　前記一対のリード端子は、前記外装フィルムの端縁近傍で折り曲げられている
    　請求項１または２に記載の蓄電素子。     The power storage element according to claim 1 or 2, wherein the pair of lead terminals are bent near an edge of the exterior film.
  6. 　請求項１または２に記載の蓄電素子が複数積層された
    　蓄電装置。     A power storage device in which a plurality of power storage elements according to claim 1 or 2 are stacked.
PCT/JP2023/024555 2022-07-08 2023-07-03 Electric power storage element and electric power storage device WO2024009928A1 (en)

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JP2020518095A (en) * 2017-04-20 2020-06-18 エー１２３ システムズ エルエルシーＡ１２３ Ｓｙｓｔｅｍｓ ＬＬＣ Battery tab structure
JP2020520078A (en) * 2018-01-09 2020-07-02 エルジー・ケム・リミテッド Pouch-type battery case having hidden gas pocket, pouch-type secondary battery including the same, and battery module including the same
JP2020170619A (en) * 2019-04-02 2020-10-15 積水化学工業株式会社 Power storage element module, power storage element unit, building, and housing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020518095A (en) * 2017-04-20 2020-06-18 エー１２３ システムズ エルエルシーＡ１２３ Ｓｙｓｔｅｍｓ ＬＬＣ Battery tab structure
JP2020520078A (en) * 2018-01-09 2020-07-02 エルジー・ケム・リミテッド Pouch-type battery case having hidden gas pocket, pouch-type secondary battery including the same, and battery module including the same
JP2019160406A (en) * 2018-03-07 2019-09-19 マクセルホールディングス株式会社 Laminate type battery
JP2020170619A (en) * 2019-04-02 2020-10-15 積水化学工業株式会社 Power storage element module, power storage element unit, building, and housing

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