WO2016147955A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
- Publication number
- WO2016147955A1 WO2016147955A1 PCT/JP2016/057189 JP2016057189W WO2016147955A1 WO 2016147955 A1 WO2016147955 A1 WO 2016147955A1 JP 2016057189 W JP2016057189 W JP 2016057189W WO 2016147955 A1 WO2016147955 A1 WO 2016147955A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lid
- tab
- electrode
- positive electrode
- insulating member
- Prior art date
Links
- 238000010030 laminating Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000037361 pathway Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 description 27
- 230000037431 insertion Effects 0.000 description 27
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 239000011888 foil Substances 0.000 description 9
- 238000009413 insulation Methods 0.000 description 9
- 239000011149 active material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- -1 nickel hydrogen Chemical class 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for 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
- H01G11/08—Structural combinations, e.g. assembly or connection, of hybrid or EDL capacitors with other electric components, at least one hybrid or EDL capacitor being the main component
-
- 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
- H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
- H01G11/16—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against electric overloads, e.g. including fuses
-
- 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
- H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or 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
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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
- H01G11/04—Hybrid capacitors
- H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
-
- 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
- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a power storage device including a current interrupting device disposed in a conductive path electrically connecting a tab and an electrode terminal, and an insulating member disposed in a case.
- a lithium ion secondary battery in vehicles such as EV (Electric Vehicle) and PHV (Plug in Hybrid Vehicle), a lithium ion secondary battery, a nickel hydrogen secondary battery, etc. are mounted as a storage device for storing power supplied to a motor etc. .
- a secondary battery includes an electrode assembly in which a positive electrode having an active material layer and a negative electrode are layered, and a case for housing the electrode assembly.
- a case there is a case having a case main body having an opening for inserting the electrode assembly, and a lid closing the opening of the case main body.
- a tab protrudes from one side of the positive electrode and the negative electrode, and a conductive member for each electrode is joined to each tab.
- the electrode terminal of each pole is electrically connected to each conductive member.
- the secondary battery includes a current interrupting device for interrupting the conductive path electrically connecting the positive electrode and the positive electrode terminal when the internal pressure of the case exceeds a predetermined pressure (see, for example, Patent Document 1) ).
- the current interrupting device is integrated with the electrode terminal of the positive electrode, and is disposed in a space defined between the inner surface of the lid and the end surface of the electrode assembly facing the inner surface. ing.
- One of the methods of assembling such a secondary battery is a method in which the electrode assembly and the lid are integrated in advance, and the electrode assembly is inserted into the case main body first and then the lid is welded to the case main body. is there. Specifically, after connecting conductive members of the same polarity to the tabs of the positive electrode and negative electrode of the electrode assembly and connecting electrode terminals of the same polarity to the conductive members of each electrode, in the two insertion holes formed in the lid A part of each electrode terminal is inserted. A current interrupting device is integrated in advance with the positive electrode terminal. Then, the electrode terminal is fixed to the lid. Then, the electrode assembly integrated with the electrode terminal through the conductive member is also integrated into the lid.
- the current interrupting device is exposed to the electrode assembly. Thereafter, the electrode assembly is housed in the case body, and the lid and the case body are joined to close the opening of the case body, whereby the assembly of the secondary battery is completed.
- An electrode terminal is fixed to the lid, a conductive member is welded to the electrode terminal, and the lid, the electrode terminal, and the conductive member are an integrated rigid body (lid side structure).
- the lid side structure and the electrode assembly are only connected via the tab, and the tab is, for example, a part of a metal foil which is a current collector of the electrode.
- the electrode assembly are movable relative to each other. Therefore, when only the electrode assembly is inserted into the case main body in a state where the electrode assembly and the lid side structure are integrated, the electrode integral with the lid is fitted to push the lid toward the electrode assembly.
- the terminal as well as the current interrupting device move towards the electrode assembly, and the current interrupting device may come into contact with the electrode assembly to cause malfunction or deformation.
- the tab is displaced, the electrode assembly moves toward the current interrupting device, and the electrode assembly contacts the current interrupting device, causing the current to flow There is a risk that the shutoff device may malfunction or be deformed.
- An object of the present invention is to provide a power storage device capable of suppressing the contact between an electrode assembly and a current interrupting device.
- An electricity storage device for solving the above problems comprises an electrode assembly formed by laminating electrodes having tabs, a case main body having an opening for housing the electrode assembly, and the opening.
- the electrode assembly includes a current interrupting device disposed and the insulating member disposed in the case, and the electrode assembly has a tab-side end surface on which the tab protrudes and which faces the inner surface of the lid.
- the current interrupting device is disposed in a space defined between the tab end surface and the inner surface of the lid, and the direction connecting the inner surface of the lid and the tab end surface at the shortest distance is the opposite direction.
- the current interrupting device is the tab end
- the insulating member has an insulating end face facing the tab-side end face, and the lid extends along the opposing direction in a state in which the current interrupting device is closest to the inner surface of the lid.
- the dimension from the inner surface of the cover to the end face of the apparatus is a first dimension
- the dimension from the inner surface of the cover along the opposing direction to the insulating end face is a second dimension when the insulating member is closest to the inner surface of the cover
- the first dimension ⁇ the second dimension is satisfied.
- the tab of the electrode assembly and the electrode terminal are electrically connected through the conductive path, and the electrode terminal is fixed to the lid, and the lid and the electrode assembly are integrated. Be done.
- the insulating member is also integrally assembled to the lid and the electrode assembly, and the current interrupt device is also disposed in the conductive path.
- the lid and the electrode assembly are integrated, the lid and the electrode terminal are an integrated rigid body. The lid and the electrode assembly are only connected via a tab, and since the tab is a part of a metal foil that is, for example, a current collector of the electrode, the tab and the electrode assembly Relative movement is possible.
- the tab when the power storage device vibrates when the power storage device is mounted on a vehicle or the like or during transportation, the tab is displaced and the electrode assembly moves toward the current interrupting device.
- the tab-side end face of the electrode assembly contacts the device end face of the current interrupting device, the tab-side end face contacts the insulating end face of the insulating member because of the first dimension ⁇ second dimension.
- the contact between the tab end face and the insulating end face restricts the movement of the electrode assembly toward the current interrupting device.
- contact between the tab end surface of the electrode assembly and the device end surface of the current interrupting device can be suppressed.
- the storage device further includes a conductive member interposed between the inner surface of the lid and the tab-side end surface to form the conductive path, the conductive member including the electrode terminal of the same polarity and the tab. Connecting, the insulating member insulates the conductive member from the lid.
- the insulating members are disposed across the conductive members of different polarities. According to this, the insulating member is interposed between the conductive member and the lid. Therefore, when the lid is pushed toward the electrode assembly during assembly of the power storage device, the insulating member is pushed toward the electrode assembly by the lid, and the insulating member comes closest to the lid. Then, since the second dimension is set in this closest state, the insulating member can be brought into contact with the electrode assembly earlier than the current interrupting device, and the current interrupting device can be protected.
- the tabs having different polarities project from the end face on the tab side. Further, in the power storage device, when the direction along the tab-side end surface and connecting the tabs having different polarities is taken as a parallel direction, the electrode terminals of the same polarity and the tabs are aligned in the parallel direction Is preferred.
- the physique of the power storage device along the opposite direction can be miniaturized.
- the outer surface of the insulating member is in contact with the inner surface of the lid in a state where the insulating member is closest to the inner surface of the lid, and the second dimension is the insulation of the insulating member It is the height of the said insulation member from an end surface to the said outer surface.
- the power storage device is a secondary battery.
- the contact between the electrode assembly and the current interrupting device can be suppressed.
- FIG. 2 is a partial cross-sectional view showing the inside of the secondary battery of the first embodiment.
- FIG. 10 is a partial side cross-sectional view showing the inside of a secondary battery according to a second embodiment.
- a secondary battery 10 as a power storage device includes a rectangular parallelepiped case 11 in which an electrode assembly 12 is accommodated.
- the case 11 has a square cylindrical metal case (for example, aluminum or aluminum alloy) case main body 11a having an opening and a bottom, and a lid 11b for closing the opening of the case main body 11a.
- An electrolyte (electrolyte solution) not shown is accommodated in the case 11.
- the secondary battery 10 of the present embodiment is a lithium ion secondary battery.
- the electrode assembly 12 has a plurality of positive electrodes 13 in the form of a rectangular sheet and a plurality of negative electrodes 14 in the form of a rectangular sheet.
- the positive electrode 13 and the negative electrode 14 are stacked in a state in which the sheet-like separator 15 is interposed between the positive electrode 13 and the negative electrode 14, and the electrode assembly 12 is a so-called stacked type.
- the positive electrode 13 and the negative electrode 14 are mutually insulated by the separator 15.
- the direction in which the positive electrode 13 and the negative electrode 14 overlap is referred to as the stacking direction Y.
- the positive electrode 13 has a substantially rectangular metal foil 13a for the positive electrode, an active material layer 13b for the positive electrode formed on both sides thereof, and a positive electrode tab 13c projecting from one edge (one side) of the metal foil 13a.
- the positive electrode tab in which several positive electrode tabs 13c were layeredly formed in one end surface of the electrode assembly 12 was formed.
- the group 18 protrudes.
- the metal foil 13a is, for example, an aluminum foil.
- the positive electrode tab group 18 is formed by gathering the positive electrode tabs 13c to one end in the stacking direction Y of the electrode assembly 12, and then bending it toward the other end in the stacking direction Y.
- the negative electrode 14 is formed of a metal foil 14a having a substantially rectangular shape, an active material layer 14b for the negative electrode formed on both sides thereof, and one edge (one side) of the metal foil 14a. And a protruding negative electrode tab 14c. And as shown to Fig.1 (a), by laminating
- the metal foil 14a of the negative electrode 14 is, for example, a copper foil. As shown in FIG.
- the negative electrode tab group 19 is formed by gathering the negative electrode tab 14c to one end in the stacking direction Y of the electrode assembly 12 and then bending it toward the other end in the stacking direction Y .
- the electrode assembly 12 has tab-side end surfaces 12 a on the end surfaces of the positive electrode tab group 18 (positive electrode tab 13 c) and the negative electrode tab group 19 (negative electrode tab 14 c).
- the secondary battery 10 includes a positive electrode terminal 16 as a positive electrode terminal fixed to the lid 11 b so as to protrude outside the case 11, and a negative electrode fixed to the lid 11 b so as to protrude outside the case 11.
- the positive electrode terminal 16 and the negative electrode terminal 17 are arranged side by side in the parallel direction X.
- the positive electrode tab group 18 (positive electrode tab 13c) and the positive electrode terminal 16 are arranged side by side in the arranging direction X, and the negative electrode tab group 19 (negative electrode tab 14c) and the negative terminal 17 are arranged side by side in the arranging direction X There is.
- the negative electrode terminal 17 has a male screw (not shown) at an end of the negative electrode terminal 17 that protrudes to the outside of the case 11, and a nut 17 b is screwed on the male screw.
- the negative electrode terminal 17 is fastened to the lid 11 b in a state in which the end (not shown) of the negative electrode terminal 17 that protrudes inside the case 11 and the nut 17 b sandwich the lid 11 b.
- the negative electrode terminal 17 is a negative electrode tab group of the electrode assembly 12 through a metal (for example, copper) and a rectangular plate-like negative electrode conductive member 21 joined to an end of the negative electrode terminal 17 that protrudes to the inside of the case 11. It is electrically connected to 19 (negative electrode tab 14c).
- the negative electrode conductive member 21 and the negative electrode tab group 19 are joined.
- the joint between the negative electrode conductive member 21 and the negative electrode tab group 19 is located between the inner surface 11 c of the lid 11 b and the tab-side end surface 12 a.
- the negative electrode conductive member 21 is disposed in parallel to the end face 12a on the tab side of the electrode assembly 12, and is interposed between the tab end face 12a and the inner surface 11c of the lid 11b.
- the positive electrode terminal 16 has an external thread (not shown) at the end of the positive electrode terminal 16 that protrudes to the outside of the case 11, and a nut 16b is screwed on this external thread. ing.
- the positive electrode terminal 16 is fastened to the lid 11 b in a state in which the end 11 c of the positive electrode terminal 16 that protrudes inside the case 11 and the nut 16 b sandwich the lid 11 b.
- the positive electrode terminal 16 is an electrode assembly through a metal (for example, aluminum) and a rectangular plate-like positive electrode conductive member 22 electrically connected to an end portion 16 c of the positive electrode terminal 16 projecting to the inside of the case 11. It is electrically connected to the twelve positive electrode tab groups 18 (positive electrode tabs 13c).
- the positive electrode conductive member 22 and the positive electrode tab group 18 are joined.
- the joint between the positive electrode conductive member 22 and the positive electrode tab group 18 is located between the inner surface 11 c of the lid 11 b and the tab-side end surface 12 a.
- the positive electrode conductive member 22 is disposed in parallel to the tab end surface 12a of the electrode assembly 12, and is interposed between the tab end surface 12a and the inner surface 11c of the lid 11b.
- the positive electrode conductive member 22 constitutes a conductive path for electrically connecting the positive electrode 13 and the positive electrode terminal 16.
- the secondary battery 10 includes a current interrupting device 25.
- the current interrupting device 25 is disposed in a conductive path that electrically connects the positive electrode 13 and the positive electrode terminal 16.
- the positive electrode conductive member 22 constituting the conductive path is disposed in a space defined between the inner surface 11 c of the lid 11 b and the tab-side end surface 12 a of the electrode assembly 12. For this reason, the current interrupting device 25 disposed on the conductive path is disposed in the space defined between the inner surface 11 c of the lid 11 b and the tab-side end surface 12 a of the electrode assembly 12.
- the current interrupting device 25 is configured to be able to interrupt the conductive path between the positive electrode 13 and the positive electrode terminal 16 when the internal pressure of the case 11 exceeds a predetermined pressure.
- the current interrupting device 25 is provided between the end portion 16 c of the positive electrode terminal 16 and the positive electrode conductive member 22 inside the case 11.
- the current interrupting device 25 has an end portion 16 c of the positive electrode terminal 16 and a metal (for example, aluminum or aluminum alloy) reverse plate 26 electrically connected through the connection member 27.
- An insulating plate 28 is interposed between the reversing plate 26 and the positive electrode conductive member 22.
- the reversing plate 26 When the internal pressure of the case 11 exceeds a predetermined pressure, the reversing plate 26 has a displacement portion 26 a that can be displaced toward the lid 11 b by receiving the internal pressure of the case 11.
- the separation portion 22a of the positive electrode conductive member 22 which is broken so as to be separated from the positive electrode conductive member 22 is connected to the displacement portion 26a. That is, the separation portion 22 a of the conductive member 22 constitutes a part of the current interrupting device 25.
- a portion (the separation portion 22 a) of the portion made of metal in the current interrupting device 25 is disposed so as to face the tab end surface 12 a of the electrode assembly 12. It is done.
- the displacement portion 26 a is in contact with the positive electrode conductive member 22, and the positive electrode conductive member 22 can be grasped as a part of the current interrupting device 25.
- the surface of the positive electrode conductive member 22 facing the tab end surface 12a can be regarded as the surface facing the tab end surface 12a in the current interrupting device 25.
- the surface of the positive electrode conductive member 22 toward the tab end surface 12a The opposite surface is referred to as an apparatus end surface 22 b.
- the current interrupting device 25 is integrated with the positive electrode terminal 16, and the positive electrode terminal 16 is fixed to the lid 11b by a nut 16b. Therefore, the current interrupting device 25 can not be displaced with respect to the lid 11b.
- the current interrupting device 25 is always at the closest position to the lid 11b, and the dimension from the inner surface 11c of the lid 11b to the device end face 22b along the opposing direction Z in the closest position is One dimension is L1.
- the first dimension L1 is shorter than the facing distance L described above, and in the secondary battery 10, the device end face 22b is separated from the tab end face 12a of the electrode assembly 12 along the facing direction Z.
- the displacement portion 26a of the reversing plate 26 is changed by the internal pressure of the case 11. It is displaced toward the lid 11b.
- the separation part 22a is separated from the positive electrode conductive member 22, whereby the conductive path between the positive electrode 13 and the positive electrode terminal 16 is physically cut and the current is cut off. .
- the secondary battery 10 includes an insulating member 40 in the case 11 for insulating the negative electrode conductive member 21 and the positive electrode conductive member 22 from the lid 11 b.
- the insulating member 40 is made of, for example, a resin.
- the insulating member 40 has a rectangular plate-like main body portion 41 and side wall portions 42 extending from the pair of long side edges of the main body portion 41 toward the electrode assembly 12. It has an inverted U shape (channel shape).
- the main body portion 41 is disposed across the negative electrode conductive member 21 and the positive electrode conductive member 22.
- the length along the short side of the main body 41 is shorter than the length along the short side of the lid 11b and slightly longer than the length along the short sides of the negative electrode conductive member 21 and the positive electrode conductive member 22. .
- the side wall portion 42 protrudes from the main body portion 41 toward the tab-side end surface 12 a of the electrode assembly 12.
- the surface facing the inner surface 11c of the lid 11b is the outer surface 41a
- the surface facing the tab end surface 12a of the electrode assembly 12 is insulated
- the end face 42a is used.
- the outer surface 41a of the main body 41 contacts the inner surface 11c of the lid 11b, and the position where the insulating member 40 is closest to the lid 11b is taken as the closest position.
- a dimension from the inner surface 11c of the lid 11b along the opposing direction Z to the insulating end face 42a when the insulating member 40 is at the closest position is a second dimension L2.
- the second dimension L2 is also the shortest distance from the outer surface 41a of the main body portion 41 to the insulating end surface 42a of the side wall portion 42.
- the shortest distance from the outer surface 41 a of the main body portion 41 to the insulating end face 42 a of the side wall portion 42 is the height of the insulating member 40 along the opposing direction Z.
- the second dimension L2 is the same as the height of the insulating member 40.
- the 1st dimension L1 ⁇ the 2nd dimension L2 is materialized. For this reason, the height of the insulating member 40 is longer than the dimension from the inner surface 11c of the lid 11b to the device end surface 22b.
- the second dimension L2 is shorter than the facing distance L along the facing direction Z.
- the operation of the secondary battery 10 configured as described above will be described together with the method of assembling the secondary battery 10.
- the positive electrode conductive member 22 is welded to the positive electrode tab group 18, and the positive electrode terminal 16 including the current interrupting device 25 is welded to the positive electrode conductive member 22.
- the negative electrode terminal 17 is welded to the negative electrode conductive member 21.
- the main body 41 of the insulating member 40 is covered on the negative electrode conductive member 21 and the positive electrode conductive member 22, and the male screw of the positive electrode terminal 16 is integrated with the insulating member 40 integrated with the negative electrode conductive member 21 and the positive electrode conductive member 22.
- the male screw of the negative electrode terminal 17 penetrate the lid 11b, the nut 16b is screwed on the male screw of the positive electrode, and the nut 17b is screwed on the male screw of the negative electrode.
- the positive electrode terminal 16 and the negative electrode terminal 17 are fastened to the lid 11 b, and the lid 11 b and the electrode assembly 12 are integrated.
- the outer surface 41 a of the insulating member 40 is separated from the inner surface 11 c of the lid 11 b in the opposing direction Z.
- the device end face 22 b of the positive electrode conductive member 22 is separated from the tab side end face 12 a of the electrode assembly 12 along the opposing direction Z, and the insulating end face 42 a of the insulating member 40 is also the electrode assembly 12. From the end face 12a of the tab 12 along the opposing direction Z.
- the positive electrode tab group 18 and the negative electrode tab group 19 are in a state of being folded back from one end to the other end in the stacking direction.
- the electrode assembly 12 is inserted into the case body 11a from the opening of the case body 11a.
- the lid 11 b is pushed toward the electrode assembly 12, and the positive electrode terminal 16, the negative electrode terminal 17, the negative electrode conductive member 21, the positive electrode conductive member 22, the positive electrode tab group 18, and the negative electrode tab group 19 integrated in the lid 11 b
- the electrode assembly 12 is pushed into the case body 11a.
- the positive electrode tab group 18 and the negative electrode tab group 19 are compressed and displaced in the opposing direction Z, and the outer surface 41a of the insulating member 40 contacts the inner surface 11c of the lid 11b.
- the lid 11b is pushed toward the tab-side end surface 12a, the positive electrode tab group 18 and the negative electrode tab group 19 are compressed and displaced in the opposing direction Z, and the insulating end surface 42a of the insulating member 40 is a tab of the electrode assembly 12 Contact the side end face 12a.
- the device end face 22b of the positive electrode conductive member 22 constituting the current interrupting device 25 is And the tab-side end face 12a in a position separated along the opposing direction Z.
- the first dimension L1 of the current interrupting device 25 and the second dimension L2 of the insulating member 40 are set so that the first dimension L1 ⁇ the second dimension L2 is satisfied. Therefore, in the assembly of the secondary battery 10, the lid 11b is pushed toward the electrode assembly 12 in order to insert the electrode assembly 12 into the case body 11a in a state where the electrode assembly 12 is integrated with the lid 11b. At the same time, the insulating end surface 42 a of the insulating member 40 contacts the tab-side end surface 12 a of the electrode assembly 12 earlier than the device end surface 22 b of the current interrupting device 25.
- the device end face 22b of the current interrupting device 25 can be prevented from contacting the tab side end face 12a, and the device end face 22b contacts the tab side end face 12a. It can suppress that a load is applied to the current interrupting device 25. As a result, malfunction of the current interrupting device 25 and damage to the current interrupting device 25 can be suppressed.
- the positive electrode tab 13 c and the negative electrode tab 14 c are displaced so that the electrode assembly 12 approaches the current interrupting device 25. There is something to do. Even in this case, since the first dimension L1 ⁇ the second dimension L2 holds, the tab-side end surface 12a of the electrode assembly 12 contacts the insulating end surface 42a of the insulating member 40. Therefore, even if the secondary battery 10 vibrates, the contact of the tab end surface 12a of the electrode assembly 12 with the device end surface 22b of the current interrupting device 25 can be suppressed, and the malfunction of the current interrupting device 25, current interruption Damage to the device 25 can be suppressed.
- the insulating member 40 insulates the negative electrode conductive member 21 and the positive electrode conductive member 22 from the lid 11 b. Therefore, the main body portion 41 of the insulating member 40 is interposed between the negative electrode conductive member 21 and the positive electrode conductive member 22 and the lid 11 b in the opposing direction Z. Therefore, when assembling the secondary battery 10, when the lid 11b is pushed toward the electrode assembly 12, the inner surface 11c of the lid 11b contacts the outer surface 41a of the insulating member 40, and the insulating member 40 becomes an electrode as the lid 11b is pushed. It will be pushed toward the assembly 12.
- the insulating member 40 contacts the inner surface 11 c of the lid 11 b, and the movement of the insulating member 40 toward the lid 11 b is restricted. Then, since the second dimension L2 is set to the insulating member 40, the insulating member 40 can be brought into contact with the electrode assembly 12 earlier than the current interrupting device 25 during assembly, and when vibrating, the electrode assembly As a result of suppressing the contact of the tab end surface 12a of the 12 with the current interrupting device 25, the current interrupting device 25 can be protected.
- the positive electrode terminal 16 and the positive electrode tab 13c are arranged in the parallel arrangement direction X, and the negative electrode terminal 17 and the negative electrode tab 14c are arranged in the parallel arrangement direction X. That is, the positive electrode terminal 16 and the positive electrode tab 13c do not overlap in the opposing direction Z, and the negative electrode terminal 17 and the negative electrode tab 14c do not overlap in the opposing direction Z. Therefore, compared with the case where the electrode terminal and the tab overlap in the facing direction Z, the physical size of the secondary battery 10 along the facing direction Z can be miniaturized.
- the current interrupting device 25 is integrated with the positive electrode terminal 16, but by arranging the positive electrode terminal 16 and the positive electrode tab 13c in the parallel direction X, the current interrupting device 25 is not affected. The size of the secondary battery 10 along the opposite direction Z can be miniaturized.
- the insulating member 40 straddles the negative electrode conductive member 21 and the positive electrode conductive member 22. For this reason, when the lid 11 b is pushed toward the electrode assembly 12, a load is applied to the two conductive members 21 and 22 from one insulating member 40. Therefore, application of load to each of the conductive members 21 and 22 separately is suppressed, generation of bending stress in each of the conductive members 21 and 22 can be suppressed, and bending of the current blocking device 25 is performed in the positive electrode. It is possible to suppress the occurrence of stress.
- the height of the insulating member 40 is the second dimension L2. Therefore, when the inner surface 11c of the lid 11b is brought into contact with the outer surface 41a of the main body portion 41 in the insulating member 40 and pushed in, the device end face 22b of the current interrupting device 25 is the tab side end face 12a using the height of the insulating member 40. It can control that it contacts. In addition, when the secondary battery 10 vibrates, the height of the insulating member 40 can be used to prevent the tab end surface 12a from coming into contact with the device end surface 22b. Therefore, when inserting or vibrating the electrode assembly 12 into the case main body 11a, the components of the secondary battery 10 can be used to suppress the contact between the device end face 22b of the current interrupting device 25 and the tab side end face 12a.
- a positive electrode conductive member 51 is joined to the positive electrode tab group 18. Further, a negative electrode conductive member 52 is joined to the negative electrode tab group 19. A positive electrode conductive member 51 and a negative electrode conductive member 52 are disposed between the inner surface 11 c of the lid 11 b and the tab-side end surface 12 a of the electrode assembly 12.
- the positive electrode conductive member 51 has a U-shaped (channel shape) electrode joint portion 51a having a first end and a second end in the longitudinal direction and joined to the positive electrode tab group 18 at the first end side.
- the electrode bonding portion 51a includes a bonding piece 51d at a portion facing the tab-side end surface 12a.
- the positive electrode tab group 18 is welded to the joint piece 51 d.
- the positive electrode tab group 18 is in a state of being gathered to one end side in the stacking direction and being bent to the other end side, and has a projecting portion 18 a that protrudes from the bent portion to the other side in the stacking direction.
- the joint piece 51d of the electrode joint portion 51a is joined to the protrusion 18a of the positive electrode tab group 18 from the end face 12a side of the tab side.
- the bonding piece 51 d covers the protrusion 18 a of the positive electrode tab group 18 from the electrode assembly 12 side.
- the joint portion between the positive electrode tab group 18 and the electrode joint portion 51a is located between the inner surface 11c of the lid 11b and the tab side end face 12a.
- the positive electrode conductive member 51 includes a flat terminal connection portion 51b on the second end side in the longitudinal direction, and the electrode bonding portion 51a and the terminal connection portion 51b are continuous in the longitudinal direction.
- the positive electrode conductive member 51 includes an insertion hole (not shown) in the terminal connection portion 51 b.
- the negative electrode conductive member 52 is provided with a U-shaped (channel shape) electrode joint portion 52 a electrically connected to the negative electrode tab group 19 on the first end side in the longitudinal direction.
- the electrode bonding portion 52a includes a bonding piece 52d at a portion facing the tab-side end surface 12a.
- the negative electrode tab group 19 is welded to the joint piece 52d.
- the negative electrode tab group 19 is in a state of being gathered to one end side in the stacking direction and being bent to the other end side, and has a projecting portion 19a that protrudes from the bent portion to the other side in the stacking direction.
- the joint piece 52d of the electrode joint portion 52a is joined to the projection 19a of the negative electrode tab group 19 from the side of the tab-side end face 12a.
- the bonding piece 52 d covers the protrusion 19 a of the negative electrode tab group 19 from the electrode assembly 12 side.
- the joint portion between the negative electrode tab group 19 and the electrode joint portion 52a is located between the inner surface 11c of the lid 11b and the tab side end face 12a.
- the negative electrode conductive member 52 includes the terminal connection portion 52b on the second end side in the longitudinal direction, and the electrode bonding portion 52a and the terminal connection portion 52b are continuous in the longitudinal direction.
- the positive electrode terminal structure 60 and the negative electrode terminal structure 61 will be described.
- the positive electrode terminal structure 60 and the negative electrode terminal structure 61 have basically the same configuration except for the current interrupting device, the common members will be described using the same member numbers.
- each of the positive electrode terminal structure 60 and the negative electrode terminal structure 61 includes an outer insulating member 57 disposed on the outer surface 11 d of the lid 11 b.
- the outer insulating member 57 insulates the lid 11 b from the external connection terminal 66 and the positive electrode lead terminal 74 of the positive electrode, and insulates the lid 11 b from the external connection terminal 66 and the negative electrode lead terminal 75.
- the outer insulating member 57 is made of synthetic resin.
- Each outer insulating member 57 is provided with an insertion hole 57d.
- Each of the positive electrode terminal structure 60 and the negative electrode terminal structure 61 includes an external connection terminal 66 disposed outside the lid 11 b, and the external connection terminal 66 electrically connects the secondary batteries 10 with each other outside the lid 11 b.
- the bus bar can be fixed.
- the external connection terminal 66 is made of metal. A nut for fastening the bus bar can be screwed into each external connection terminal 66.
- the positive electrode terminal structure 60 includes a positive electrode lead terminal 74 as an electrode terminal electrically connected to the positive electrode tab group 18 of the electrode assembly 12 through the positive electrode conductive member 51.
- the negative electrode terminal structure 61 includes a negative electrode lead terminal 75 as an electrode terminal electrically connected to the negative electrode tab group 19 of the electrode assembly 12 through the negative electrode conductive member 52.
- the positive electrode terminal structure 60 includes a terminal connection member 44 that electrically connects the external connection terminal 66 of the positive electrode and the positive electrode lead terminal 74, and the negative electrode terminal structure 61 includes the external connection terminal 66 of the negative electrode and the negative electrode lead terminal 75.
- the terminal connection member 44 electrically connected is provided.
- Each terminal connection member 44 includes a connection piece 46 on one end side in the longitudinal direction and a fixing piece 47 on the other end side in the longitudinal direction.
- Each of the terminal connection members 44 is provided with a through hole 46a that penetrates the connection piece 46 in the thickness direction thereof, and the external connection terminal 66 is inserted through the through hole 46a.
- each of the terminal connection members 44 includes an insertion hole 47a that penetrates the fixing piece 47 in the thickness direction, and the positive electrode lead terminal 74 or the negative electrode lead terminal 75 is inserted through the insertion hole 47a.
- the positive electrode lead terminal 74 of the positive electrode terminal structure 60 includes a connecting shaft 74 a and a base 74 b which are continuous in the axial direction.
- the base 74b of the positive electrode lead terminal 74 is disposed in the case 11 from the inner surface 11c of the lid 11b, and the connecting shaft 74a is a through hole of the positive electrode conductive member 51 and a through hole 30a of the inner insulating member 30 described later.
- the insertion hole 11e of the lid 11b, the insertion hole 57d of the outer insulating member 57, and the insertion hole 47a of the terminal connection member 44 are penetrated.
- the above-described inner insulating member 30 is interposed between the lid 11b and the terminal connection portion 51b in the positive electrode terminal structure 60, and restricts the contact between the lid 11b and the terminal connection portion 51b. 11b and the positive electrode conductive member 51 are insulated.
- the tip end portion of the connecting shaft portion 74a which penetrates the insertion hole 47a of the terminal connection member 44 is axially crimped.
- the fixing piece 47 of the positive electrode conductive member 51, the inner insulating member 30, the lid 11b, the outer insulating member 57, and the terminal connection member 44 is held by the connecting shaft 74a and the base 74b.
- the positive electrode lead-out terminal 74 is fixed to the lid 11 b by the clamping accompanying the caulking.
- An O-ring 73 shown in FIG. 6 is in close contact with the periphery of the insertion hole 11e on the inner surface 11c of the lid 11b, and seals the insertion hole 11e of the lid 11b.
- the tip end portion of the connecting shaft portion 74 a of the positive electrode lead terminal 74 is electrically connected to the terminal connecting member 44.
- the base 74 b of the positive electrode lead terminal 74 is electrically connected to the positive electrode conductive member 51.
- the negative electrode lead terminal 75 includes a connecting shaft portion 75a and a base portion 75b which are continuous in the axial direction.
- the connection shaft portion 75a of the negative electrode lead terminal 75 is inserted into the insertion hole 30a of the inner insulation member 30, the insertion hole 11e of the lid 11b, the insertion hole 57d of the outer insulation member 57, and the insertion hole 47a of the terminal connection member 44.
- the negative electrode lead terminal 75 has an axial hole 75c penetrating in the axial direction.
- the inner insulating member 30 is interposed between the lid 11b and the base 75b of the negative electrode lead terminal 75 to regulate the contact between the lid 11b and the base 75b, and the lid 11b and the negative electrode lead terminal 75 Insulate.
- the tip end portion of the connecting shaft portion 75a which penetrates the insertion hole 47a of the terminal connection member 44 is axially crimped.
- the inner insulating member 30, the lid 11b, the outer insulating member 57, and the terminal connection member 44 are held by the connecting shaft portion 75a and the base portion 75b.
- the negative electrode lead-out terminal 75 is fixed to the lid 11 b by the clamping accompanying the caulking.
- An O-ring 73 shown in FIG. 6 is in close contact with the periphery of the insertion hole 11e on the inner surface 11c of the lid 11b, and seals the insertion hole 11e of the lid 11b.
- the tip end portion of the connection shaft portion 75 a of the negative electrode lead terminal 75 is electrically connected to the terminal connection member 44.
- the secondary battery 10 includes a current interrupting device 80 integrated with the negative electrode lead terminal 75 which is one of the electrode terminals.
- the current interrupting device 80 is disposed in a conductive path that electrically connects the negative electrode tab 14 c (the negative electrode tab group 19) and the negative electrode lead terminal 75.
- the current interrupting device 80 is disposed inside the case 11. The pressure outside the case 11 is introduced into the current interrupting device 80 through the axial hole 75 c of the negative electrode lead terminal 75.
- the current interrupting device 80 electrically connects the electrode assembly 12 and the negative electrode lead terminal 75. Cut off the current.
- the current interrupting device 80 is in contact with the negative electrode conductive member 52, and the negative electrode conductive member 52 can be grasped as a part of the current interrupting device 80. Therefore, as shown in FIG. 7, the surface of the negative electrode conductive member 52 facing the tab end surface 12 a can be regarded as the surface facing the tab end surface 12 a of the current interrupting device 80.
- the opposing surface to the tab-side end surface 12a in this case is taken as an apparatus end surface 52f.
- the current interrupting device 80 is integrated with the negative electrode lead terminal 75, and the negative electrode lead terminal 75 is fixed to the lid 11b by caulking. Therefore, the current interrupting device 80 can not be displaced with respect to the lid 11b. Therefore, the current interrupting device 80 is always at the closest position to the lid 11b, and the dimension from the inner surface 11c of the lid 11b to the device end face 52f along the opposing direction Z in the closest position is the first One dimension is L1.
- the first dimension L1 is shorter than the facing distance L described above, and in the secondary battery 10, the device end face 52f is separated from the tab end face 12a of the electrode assembly 12 along the facing direction Z.
- the insulating member 40 is interposed between the electrode joint portions 51a and 52a and the lid 11b to insulate both of them.
- the insulating end face 42a of the side wall portion 42 protrudes toward the end face 12a on the tab side of the joint pieces 51d and 52d so as to be closer to the tab side end face 12a than the joint pieces 51d and 52d of the electrode joint portions 51a and 52a.
- the first dimension L1 ⁇ the second dimension L2 is satisfied when the insulating member 40 is at the closest position.
- the negative electrode lead terminal 75, the current interrupting device 80 and the negative electrode conductive member 52 are integrated in advance.
- the outer insulating member 57 is disposed on the outer surface 11 d of the lid 11 b.
- the external connection terminal 66 is supported by the outer insulating member 57.
- the external connection terminal 66 is inserted into the through hole 46 a of the terminal connection member 44.
- the O-ring 73 and the inner insulating member 30 are disposed on the inner surface 11c side of the lid 11b, and the positive electrode conductive member 51 is disposed.
- the O-ring 73 and the inner insulating member 30 are disposed on the inner surface 11c side of the lid 11b, and the negative electrode conductive member 52 is disposed.
- the main body portion 41 of the insulating member 40 is interposed between the positive electrode joint 51a and the negative electrode joint 52a and the inner surface 11c of the lid 11b.
- the connecting shaft portion 74a of the positive electrode lead terminal 74 is inserted into the insertion hole of the positive electrode conductive member 51, the insertion hole 30a of the inner insulation member 30, the O ring 73, the insertion hole 11e of the lid 11b, the insertion hole 57d of the outer insulation member 57, And the insertion holes 47 a of the terminal connection member 44.
- the connection shaft portion 75a of the negative electrode lead terminal 75 is inserted into the insertion hole 30a of the inner insulating member 30, the O ring 73, the insertion hole 11e of the lid 11b, the insertion hole 57d of the outer insulating member 57, and the terminal connection member It inserts in 44 penetration holes 47a.
- the terminal connection portion 51b, the inner insulating member 30, the O-ring 73, the lid 11b, and the outer insulating member 57 are formed between the base portion 74b and the distal end of the connecting shaft portion 74a by caulking the positive electrode connection shaft portion 74a.
- the terminal connection member 44 are integrated.
- the inner insulating member 30, the O-ring 73, the lid 11b, the outer insulating member 57, and the terminal connection member are formed between the base portion 75b and the tip of the connecting shaft portion 75a by caulking the connecting shaft portion 75a of the negative electrode. While 44 is integrated, the current interrupting device 80 is also integrated.
- the positive electrode terminal structure 60 and the negative electrode terminal structure 61 are installed on the lid 11 b, and the insulating member 40 is integrated with the lid 11 b.
- the positive electrode tab group 18 is joined to the electrode joint portion 51 a of the positive electrode conductive member 51 by laser welding
- the negative electrode tab group 19 is joined to the electrode joint portion 52 a of the negative electrode conductive member 52 by laser welding.
- the electrode bonding portion 51a and the electrode bonding portion 52a are not bent in a U shape (channel shape) but are flat before being laser-welded with the tab groups 18, 19.
- the electrode bonding portions 51a and 52a are bent into a U shape (channel shape), and the positive electrode tab group 18 and the negative electrode tab group 19 are bent.
- the protruding portions 18a and 19a are covered from the electrode assembly 12 side by the bonding pieces 51d and 52d.
- the lid 11 b and the electrode assembly 12 are integrated through the positive electrode tab group 18 and the negative electrode tab group 19.
- the electrode assembly 12 is inserted into the case body 11a. At this time, the electrode assembly 12 is pushed into the case body 11a. Then, after the electrode assembly 12 is inserted into the case main body 11a, the lid 11b is joined to the open end of the case main body 11a, whereby the secondary battery 10 is assembled.
- the second embodiment in addition to the same effects as the effects (1) to (5) described in the first embodiment, the following effects can be obtained. (6) Even in the state where the insulating member 40 is integrated in advance with the lid 11b, the first dimension L1 ⁇ the second dimension L2 is satisfied. Therefore, the contact between the current interrupting device 80 and the electrode assembly 12 can be suppressed by the insulating member 40.
- the insulating member 90 has a U-shape (channel shape) in which the side view seen from the longitudinal direction opens in one of the short sides of the insulating member 90. It may be Although only the configuration on the negative electrode side is shown in FIGS. 9 and 10, the configuration on the positive electrode side is the same as the configuration on the negative electrode side.
- the insulating member 90 has a rectangular flat main body 91. The main body portion 91 is interposed between the electrode joint portions 51a and 52a and the lid 11b to insulate them from each other.
- the insulating member 90 has a side wall 92.
- the side wall portion 92 protrudes in an L-shape from one long side of the main body portion 91 toward the electrode assembly 12.
- the side wall portion 92 covers the protrusion 18 a of the positive electrode tab group 18 and the protrusion 19 a of the negative electrode tab group 19 from the electrode assembly 12 side.
- a surface opposed to the end surface 12a on the tab side is an insulating end surface 92a.
- the outer surface 91a of the main body 91 is in contact with the inner surface 11c of the lid 11b, and the position where the insulating member 90 is closest to the lid 11b is taken as the closest position.
- the dimension from the inner surface 11c of the lid 11b along the opposing direction Z to the insulating end face 92a of the side wall 92 when the insulating member 90 is at the closest position is the second dimension L2.
- the second dimension L2 is the same as the height of the side wall 92. Then, regarding the insulating member 90, the first dimension L1 ⁇ the second dimension L2 is satisfied.
- the positive electrode terminal structure 60 and the negative electrode terminal structure 61 are installed on the lid 11 b.
- the positive electrode tab group 18 is joined by laser welding to the electrode joint portion 51 a of the positive electrode conductive member 51
- the negative electrode tab group 19 is joined by laser welding to the electrode joint portion 52 a of the negative electrode conductive member 52.
- the electrode bonding portions 51a and 52a are bent into a U shape (channel shape), and the positive electrode tab group 18 and the negative electrode tab group 19 are bent.
- the protruding portions 18a and 19a are covered from the electrode assembly 12 side by the bonding pieces 51d and 52d.
- the lid 11 b and the electrode assembly 12 are integrated. In the state in which the lid 11 b and the electrode assembly 12 are integrated, a gap is present between the lid 11 b and the electrode joint portions 51 a and 52 a.
- the openings along the longitudinal direction of the insulating member 90 are slid toward the electrode bonding portions 51a and 52a in a state where the openings are opposed to the bent portions of the electrode bonding portions 51a and 52a.
- the main body portion 91 is inserted into the gap between the electrode joint portions 51a, 52a and the lid 11b, and the end portion of the side wall portion 92 on the tab side end face 12a side is made of the joint pieces 51d, 52d and the tab side end face 12a. Insert in between.
- the main body portion 91 of the insulating member 90 is supported by the electrode bonding portions 51a and 52a, and a part of the side wall portion 92 covers the bonding pieces 51d and 52d from the electrode assembly 12 side.
- the insulating member 90 can be mounted even after the positive electrode terminal structure 60 and the negative electrode terminal structure 61 are installed on the lid 11 b.
- the heights of the insulating members 40 and 90 are set to the second dimension L2, but the present invention is not limited to this.
- the heights of the separate members and the insulating members 40 and 90 are set.
- the combined dimension is the second dimension L2.
- the insulating members 40 and 90 are interposed between an insulating member for the negative electrode interposed between the negative electrode conductive members 21 and 52 and the lid 11b, and between the positive electrode conductive members 22 and 51 and the lid 11b. You may divide into the insulation member for positive electrodes.
- the insulating member 40 insulates the negative electrode conductive member 21 and the positive electrode conductive member 22 from the lid 11b, but the invention is not limited thereto.
- the positive electrode terminal 16 and the electrode assembly An insulating member is provided to insulate from (12). At this time, the surface facing the tab-side end surface 12 a in the insulating member for the positive electrode terminal 16 is taken as the insulating end surface.
- the insulating member approaches the inner surface 11c of the lid 11b most closely.
- the second dimension L2 is set in this closest state.
- the current interrupting device 25 is provided on the positive electrode conductive member 22. For this reason, when inserting the electrode assembly 12 into the case main body 11a, when the lid 11b is pushed toward the electrode assembly 12, the current interrupting device 25 is closest to the inner surface 11c of the lid 11b, and the current is interrupted in this state
- the first dimension L1 of the device 25 is set. Then, regarding the relationship between the first dimension L1 of the current interrupting device 25 and the second dimension L2 of the insulating member, the first dimension ⁇ the second dimension is established.
- the current interrupting device 25 is not disposed in the conductive path of the positive electrode, and is disposed in the conductive path electrically connecting the negative electrode tab 14c and the negative electrode terminal 17 on the negative electrode side. It is also good.
- the current interrupting device 80 is not disposed in the conductive path of the negative electrode, but is disposed in the conductive path electrically connecting the positive electrode tab 13c and the positive electrode lead terminal 74 on the positive electrode side. It may be
- the structure of the current interrupting devices 25 and 80 is not limited to the structure of the embodiments, and may be changed as appropriate.
- the positive electrode terminal 16 may be disposed so as to overlap the positive electrode tab group 18 with the positive electrode conductive member 22 interposed in the opposing direction Z, and the negative electrode terminal 17 in the opposing direction Z It may be disposed to overlap the negative electrode tab group 19 with the negative electrode conductive member 21 interposed therebetween.
- the electrode assembly may be a wound type in which a separator is interposed between one long strip-like positive electrode and one long strip-like negative electrode.
- the positive electrode 13 may have the active material layer 13 b on one side.
- the negative electrode 14 may have the active material layer 14 b on one side.
- the separator 15 may have a bag shape that accommodates the positive electrode 13 or the negative electrode 14.
- the positive electrode 13 and the negative electrode 14 may be one each.
- the secondary battery 10 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel hydrogen secondary battery or a nickel cadmium secondary battery.
- the storage device is not limited to the secondary battery 10, and may be, for example, a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
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Abstract
Description
これによれば、絶縁部材は、導電部材と蓋との間に介在することとなる。よって、蓄電装置の組立時、蓋を電極組立体に向けて押し込むと、絶縁部材が蓋によって電極組立体に向けて押し込まれるとともに、絶縁部材が蓋に最接近することとなる。そして、この最接近した状態で第2寸法を設定したため、絶縁部材を電流遮断装置より先に電極組立体に接触させることができ、電流遮断装置を保護できる。
また、蓄電装置について、前記タブ側端面に沿い、かつ互いに異なる極性の前記タブを結ぶ方向を並設方向とすると、互いに同じ極性の前記電極端子と前記タブとは前記並設方向に並んでいるのが好ましい。
また、蓄電装置について、前記絶縁部材が前記蓋の内面に最接近した状態では、前記蓋の内面に対し前記絶縁部材の外面が接触しており、前記第2寸法は、前記絶縁部材の前記絶縁端面から前記外面までの前記絶縁部材の高さである。
また、前記蓄電装置は二次電池である。
以下、二次電池10の第1の実施形態を図1(a)~図5にしたがって説明する。
図1(a)に示すように、蓄電装置としての二次電池10は、直方体状のケース11を備え、このケース11内には電極組立体12が収容されている。ケース11は、開口部及び底部を有する四角筒状の金属製(例えば、アルミニウム製又はアルミニウム合金製)のケース本体11aと、ケース本体11aの開口部を塞ぐ蓋11bとを有する。ケース11内には図示しない電解質(電解液)が収容されている。本実施形態の二次電池10は、リチウムイオン二次電池である。
まず、電極組立体12を形成した後、正極タブ群18に正極導電部材22を溶接し、その正極導電部材22に電流遮断装置25を含めた正極端子16を溶接する。また、負極タブ群19に負極導電部材21を溶接した後、負極導電部材21に負極端子17を溶接する。次に、負極導電部材21と正極導電部材22とに絶縁部材40の本体部41を被せ、負極導電部材21と正極導電部材22とに絶縁部材40を一体化した状態で、正極端子16の雄ねじと負極端子17の雄ねじとを、蓋11bを貫通させ、正極の雄ねじにナット16bを螺合し、負極の雄ねじにナット17bを螺合する。その結果、蓋11bに正極端子16及び負極端子17が締結されるとともに、蓋11bと電極組立体12とが一体化される。
(1)電流遮断装置25における第1寸法L1と、絶縁部材40における第2寸法L2を設定し、第1寸法L1<第2寸法L2が成立するように設計した。このため、二次電池10の組立において、蓋11bに電極組立体12を一体化した状態で、電極組立体12をケース本体11aに挿入するため、蓋11bを電極組立体12に向けて押し込んだとき、絶縁部材40の絶縁端面42aが、電流遮断装置25の装置端面22bより先に電極組立体12のタブ側端面12aに接触する。このため、電極組立体12をケース本体11aに挿入する際、電流遮断装置25の装置端面22bがタブ側端面12aに接触することを抑制でき、装置端面22bがタブ側端面12aに接触することで電流遮断装置25に荷重が掛かってしまうことを抑制できる。その結果として、電流遮断装置25の誤作動や、電流遮断装置25が損傷受けることを抑制できる。
次に、蓄電装置としての二次電池10の第2の実施形態を図6~図9にしたがって説明する。なお、第2の実施形態は、第1の実施形態と同様の部分についてはその詳細な説明を省略する。
なお、負極引出端子75と電流遮断装置80と負極導電部材52が予め一体化されているとする。まず、蓋11bの外面11dに外側絶縁部材57を配置する。外側絶縁部材57に外部接続端子66を支持させる。次に、端子接続部材44の貫通孔46aに外部接続端子66を挿入する。
(6)絶縁部材40が蓋11bに予め一体化された状態であっても、第1寸法L1<第2寸法L2が成立する。このため、絶縁部材40によって、電流遮断装置80と電極組立体12との接触を抑制できる。
○ 第2の実施形態において、図9に示すように、絶縁部材90は、その長手方向から見た側面視が絶縁部材90の短手方向のうち一方向に開口するU字状(チャネル形状)であってもよい。図9及び図10では、負極側の構成のみを示すが、正極側の構成も負極側の構成と同様である。絶縁部材90は、矩形平板状の本体部91を有する。本体部91は、電極接合部51a,52aと蓋11bとの間に介在し、両者を絶縁する。また、絶縁部材90は側壁部92を有する。側壁部92は、本体部91の一長辺から電極組立体12に向けてL字状に突出している。側壁部92は、正極タブ群18の突出部18a及び負極タブ群19の突出部19aを電極組立体12側から覆う。側壁部92において、タブ側の端面12aに対峙する面を絶縁端面92aとする。絶縁部材90において、本体部91の外面91aが蓋11bの内面11cに接触し、絶縁部材90が蓋11bに最接近した位置を最接近位置とする。絶縁部材90が最接近位置にあるときの、上記対向方向Zに沿った蓋11bの内面11cから側壁部92の絶縁端面92aまでの寸法が第2寸法L2となる。第2寸法L2は、側壁部92の高さと同じである。そして、絶縁部材90についても第1寸法L1<第2寸法L2が成立する。
まず、正極端子構造60及び負極端子構造61が蓋11bに設置される。次に、正極導電部材51の電極接合部51aに対し、正極タブ群18がレーザ溶接によって接合され、負極導電部材52の電極接合部52aに対し、負極タブ群19がレーザ溶接によって接合される。次に、電極接合部51a,52aがU字状(チャネル形状)となるように折り曲げられ、正極タブ群18及び負極タブ群19を折り曲げる。すると、接合片51d,52dによって、突出部18a,19aが電極組立体12側から覆われた状態になる。その結果、蓋11bと電極組立体12が一体化される。蓋11bと電極組立体12が一体化された状態では、蓋11bと電極接合部51a,52aとの間には隙間が存在する。
○ 各実施形態では、絶縁部材40,90の高さを第2寸法L2としたが、これに限らない。例えば、絶縁部材40,90における本体部41,91の外面41a,91aと、蓋11bの内面11cとの間に別部材が介在する場合は、その別部材と絶縁部材40,90の高さを合わせた寸法が第2寸法L2となる。
○ 第1の実施形態において、正極端子16は、対向方向Zにおいて正極導電部材22を挟んで正極タブ群18に重なるように配設されていてもよいし、負極端子17は、対向方向Zにおいて負極導電部材21を挟んで負極タブ群19に重なるように配設されていてもよい。
○ 正極電極13は、片面に活物質層13bを有していてもよい。同様に、負極電極14は、片面に活物質層14bを有していてもよい。
○ 正極電極13及び負極電極14は1枚ずつであってもよい。
○ 蓄電装置は、二次電池10に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。
Claims (7)
- タブを有する電極を積層して構成された電極組立体と、
前記電極組立体を収容するための、開口部を有するケース本体、及び前記開口部を閉塞する蓋を有するケースと、
前記タブと電気的に接続されるとともに前記蓋を貫通して前記ケース外に突出した電極端子と、
前記タブと前記電極端子とを電気的に接続する導電経路に配設された電流遮断装置と、
前記ケース内に配設された絶縁部材と、を備え、
前記電極組立体は、前記タブが突出し、かつ前記蓋の内面に対向したタブ側端面を有し、前記電流遮断装置は、前記タブ側端面と前記蓋の内面との間に画定された空間に配置されており、前記蓋の内面と前記タブ側端面とを最短距離で結ぶ方向が対向方向であり、前記電流遮断装置は前記タブ側端面に対向する装置端面を有し、前記絶縁部材は前記タブ側端面に対向する絶縁端面を有し、
前記電流遮断装置が前記蓋の内面に最接近した状態において、前記対向方向に沿った前記蓋の内面から前記装置端面までの寸法を第1寸法とし、前記絶縁部材が前記蓋の内面に最接近した状態において、前記対向方向に沿った前記蓋の内面から前記絶縁端面までの寸法を第2寸法とすると、
第1寸法<第2寸法が成立する蓄電装置。 - 前記蓋の内面と前記タブ側端面との間に介在して前記導電経路を構成する導電部材をさらに有し、前記導電部材は同じ極性の前記電極端子と前記タブとを接続し、
前記絶縁部材は、前記導電部材を前記蓋から絶縁している請求項1に記載の蓄電装置。 - 前記絶縁部材は、互いに異なる極性の前記導電部材に跨って配置されている請求項2に記載の蓄電装置。
- 前記タブ側端面からは互いに異なる極性の前記タブが突出している請求項1~請求項3のいずれか一項に記載の蓄電装置。
- 前記タブ側端面に沿い、かつ互いに異なる極性の前記タブを結ぶ方向を並設方向とすると、互いに同じ極性の前記電極端子と前記タブとは前記並設方向に並んでいる請求項4に記載の蓄電装置。
- 前記絶縁部材が前記蓋の内面に最接近した状態では、前記蓋の内面に対し前記絶縁部材の外面が接触しており、前記第2寸法は、前記絶縁部材の前記絶縁端面から前記外面までの前記絶縁部材の高さである請求項1~請求項5のうちいずれか一項に記載の蓄電装置。
- 前記蓄電装置は二次電池である請求項1~請求項6のうちいずれか一項に記載の蓄電装置。
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