WO2024203729A1 - 蓄電装置 - Google Patents

蓄電装置 Download PDF

Info

Publication number
WO2024203729A1
WO2024203729A1 PCT/JP2024/011042 JP2024011042W WO2024203729A1 WO 2024203729 A1 WO2024203729 A1 WO 2024203729A1 JP 2024011042 W JP2024011042 W JP 2024011042W WO 2024203729 A1 WO2024203729 A1 WO 2024203729A1
Authority
WO
WIPO (PCT)
Prior art keywords
storage device
uneven portion
concave
energy storage
uneven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/011042
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
祐太 岩間
真也 下司
雄大 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to EP24779849.9A priority Critical patent/EP4693634A1/en
Priority to JP2025510648A priority patent/JPWO2024203729A1/ja
Priority to CN202480019880.9A priority patent/CN120883426A/zh
Publication of WO2024203729A1 publication Critical patent/WO2024203729A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01G11/80—Gaskets; Sealings
    • 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
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This disclosure relates to an electricity storage device.
  • the energy storage device includes an electrode assembly in which positive and negative electrode plates are wound with a separator interposed therebetween, an electrolyte, a cylindrical outer can with a bottom that contains the electrode assembly and the electrolyte, a sealing body that closes the opening of the outer can, and an annular gasket that is interposed between the outer can and the sealing body (for example, Patent Document 1).
  • Electricity storage devices may be installed in electric vehicles.
  • the present disclosure therefore aims to provide an energy storage device that can improve reliability.
  • the energy storage device comprises an electrode assembly in which a first electrode plate and a second electrode plate are wound with a separator interposed therebetween, an electrolyte, a cylindrical outer can with a bottom that contains the electrode assembly and the electrolyte and has a shoulder extending radially inward from the open end, a sealing body that closes the opening of the outer can, and an annular gasket that is interposed between the outer can and the sealing body, and the shoulder has a first surface that faces the gasket and a second surface that is the reverse side of the first surface, and at least one of the first surface and the second surface has a first uneven portion formed in a concave and/or convex shape.
  • the energy storage device disclosed herein can improve reliability.
  • FIG. 1 is an axial cross-sectional view showing an example of an electric storage device according to an embodiment.
  • 2 is an axial cross-sectional view showing an opening side of an electricity storage device according to an embodiment;
  • FIG. 6 is a schematic diagram showing a state when the internal pressure of the power storage device increases;
  • FIG. 4 is an axial cross-sectional view showing an opening side of an electricity storage device that is another example of the embodiment.
  • FIG. 4 is an axial cross-sectional view showing an electricity storage device as another example of the embodiment.
  • 4 is an axial cross-sectional view showing an opening side of an electricity storage device that is another example of an embodiment.
  • FIG. 6 is a schematic diagram showing a state when the internal pressure of the power storage device increases;
  • FIG. 4 is an axial cross-sectional view showing an opening side of an electricity storage device that is another example of an embodiment.
  • FIG. 4 is an axial cross-sectional view showing an opening side of an electricity storage device that is another example of an embodiment.
  • FIG. 4
  • the power storage device 10 is used, for example, as a power source for an electric vehicle.
  • the power storage device of the present disclosure is not limited to being used as a power source for electric vehicles, and may be used, for example, as a power source for motor-driven electric devices such as power tools, power-assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric carts.
  • the power storage device of the present disclosure may also be used as a power source for various electric devices used indoors and outdoors, such as cleaners, radios, lighting devices, digital cameras, and video cameras.
  • the energy storage device 10 includes a wound electrode body 14 in which a positive electrode plate 11 as a first electrode plate and a negative electrode plate 12 as a second electrode plate are wound with a separator 13 interposed therebetween, an outer can 20 that houses the electrode body 14, and a sealing body 30 that closes the opening of the outer can 20.
  • the outer can 20 houses an electrolyte together with the electrode body 14.
  • the electrolyte in this embodiment is a non-aqueous electrolyte, but may be an aqueous electrolyte.
  • the energy storage device 10 may be a capacitor.
  • each member may be described using the axial direction P, the circumferential direction R, and the radial direction D.
  • the side in the axial direction P where the sealing body 30 is provided may be described as the upper side
  • the side where the bottom 20B of the outer can 20 is formed may be described as the lower side.
  • the exterior can 20 has a first uneven portion 51 formed in a concave and/or convex shape on the surface facing the gasket 33 of the shoulder portion 20C, and the gasket 33 has a second uneven portion 52 formed in a concave and/or convex shape on the surface facing the shoulder portion 20C that fits into the first uneven portion 51 (see FIG. 2).
  • the first uneven portion 51 and the second uneven portion 52 can improve the reliability of the energy storage device 10.
  • the positive electrode plate 11, the negative electrode plate 12, and the separator 13 are all long strips wound in a spiral shape. At this time, the positive electrode plate 11 and the negative electrode plate 12 are stacked in a shifted manner so that they protrude to opposite sides in the axial direction P (height direction of the storage device 10).
  • the composite layer of the negative electrode plate 12 may be formed to be one size larger than the composite layer of the positive electrode plate 11 in order to prevent lithium precipitation. In other words, the composite layer of the negative electrode plate 12 may be formed to be longer in the longitudinal direction and width direction (short direction) than the composite layer of the positive electrode plate 11.
  • the separator 13 is formed to be at least one size larger than the positive electrode plate 11, and for example, two separators 13 are arranged to sandwich the positive electrode plate 11. Note that the electrode body 14 does not necessarily have to be configured in a state in which the positive electrode plate 11 and the negative electrode plate 12 are wound. For example, the electrode body 14 may be constructed by alternately stacking multiple positive electrode plates 11 and multiple negative electrode plates 12.
  • the positive electrode plate 11 has a positive electrode plate core and a positive electrode plate mixture layer formed on at least one surface of the core.
  • a foil of a metal that is stable in the potential range of the positive electrode plate 11, such as aluminum or an aluminum alloy, or a film with the metal disposed on the surface layer is used.
  • the positive electrode plate mixture layer contains, for example, a positive electrode plate active material, a conductive agent such as acetylene black, and a binder such as polyvinylidene fluoride, and is preferably formed on both sides of the positive electrode plate core.
  • a lithium transition metal complex oxide is used as the positive electrode plate active material.
  • the negative plate 12 has a negative plate core and a negative plate mixture layer formed on at least one surface of the core.
  • a foil of a metal that is stable in the potential range of the negative plate 12, such as copper or a copper alloy, or a film with the metal disposed on the surface layer can be used.
  • the negative plate mixture layer contains, for example, a negative plate active material and a binder such as styrene-butadiene rubber (SBR), and is preferably formed on both sides of the negative plate core.
  • SBR styrene-butadiene rubber
  • graphite, a silicon-containing compound, etc. are used as the negative plate active material.
  • the non-aqueous electrolyte contained in the exterior can 20 includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • a non-aqueous solvent for example, esters, ethers, nitriles, amides, or a mixed solvent of two or more of these is used as the non-aqueous solvent.
  • the non-aqueous solvent may contain a halogen-substituted body in which at least a part of the hydrogen of these solvents is replaced with a halogen atom such as fluorine.
  • the non-aqueous solvent include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), and a mixed solvent of these.
  • a lithium salt such as LiPF 6 is used as the electrolyte salt.
  • the non-aqueous electrolyte may be a gel electrolyte, a solid electrolyte, or the like, instead of an electrolytic
  • a positive electrode lead 15 extending from the upper end of the electrode body 14 in the axial direction P and connecting the positive electrode plate 11 constituting the electrode body 14 and the current collector plate 32 of the sealing body 30, and an upper insulating plate 16 arranged between the electrode body 14 and the sealing body 30.
  • the positive electrode lead 15 electrically connects the positive electrode plate 11 and the sealing body 30. Therefore, the positive electrode cap 31 of the sealing body 30 functions as the first electrode external terminal (positive electrode plate external terminal).
  • the upper insulating plate 16 prevents the positive electrode plate 11 and the positive electrode lead 15 from touching the outer can 20, and also prevents the positive electrode lead 15 from touching the negative electrode plate 12 of the electrode body 14.
  • a negative electrode current collector 35 is provided below the electrode body 14.
  • a negative electrode core material exposed portion (not shown) where no negative electrode mixture layer is provided in the negative electrode core material protrudes below the axial direction P of the negative electrode plate 12.
  • the negative electrode core material exposed portion is formed from the end at the start of winding to the end at the end of winding in the longitudinal direction (circumferential direction R) of the long negative electrode plate 12.
  • the negative electrode core material exposed portion is bonded to the negative electrode current collector 35, and the negative electrode plate 12 and the negative electrode current collector 35 are electrically connected.
  • the negative electrode current collector 35 is bonded to the inner surface of the bottom 20B of the outer can 20, and the negative electrode current collector 35 and the outer can 20 are electrically connected.
  • the outer can 20 is a cylindrical metal container with a bottom that is open at the top end in the axial direction P.
  • the outer can 20 is generally made of a metal whose main component is iron, but when the positive electrode plate 11 is connected, it may be made of a metal whose main component is aluminum or the like.
  • the outer can 20 has a cylindrical tube portion 20A, a circular bottom portion 20B when viewed from the bottom, a shoulder portion 20C that extends inward in the circumferential direction R from the open end of the tube portion 20A and is formed in an annular shape, and a groove portion 20D that is formed along the circumferential direction R of the tube portion 20A.
  • the outer can and the positive electrode plate may be electrically connected, and the sealing plate and the negative electrode plate may be electrically connected.
  • the groove portion 20D is formed at a position near the opening of the outer can 20, a predetermined distance away from the shoulder portion 20C.
  • the groove portion 20D is a portion of the tubular portion 20A that protrudes inwardly of the outer can 20, and is formed, for example, by spinning the tubular portion 20A from the outside.
  • the outer can 20 is reduced in diameter, and a thin groove is formed on the outer peripheral surface of the tubular portion 20A.
  • the groove portion 20D has a generally U-shaped cross section, and is preferably formed in a ring shape over the entire length of the tubular portion 20A in the circumferential direction R.
  • the bottom 20B of the exterior can 20 is provided with a safety valve mechanism that operates when an abnormality occurs in the energy storage device 10.
  • a circular marking may be formed on the bottom 20B as the safety valve mechanism. When an abnormality occurs in the energy storage device 10 and the internal pressure rises, this marking may be broken preferentially, forming a gas exhaust port in the bottom 20B.
  • the negative electrode current collector 35 also serves as the bottom 20B, a marking may be formed on the negative electrode current collector 35, and when the internal pressure of the energy storage device 10 reaches a predetermined level or higher, the marking may be broken to allow exhaust.
  • the sealing body 30 is formed in a disk shape overall, and includes a positive electrode cap 31, a current collector plate 32, and a gasket 33.
  • the sealing body 30 is placed on the groove portion 20D of the outer can 20, and is fixed to the upper end of the outer can 20. More specifically, the shoulder portion 20C of the outer can 20 is bent inward in the radial direction D and crimped against the sealing body 30, and the sealing body 30 is fixed to the upper end of the outer can 20 by the shoulder portion 20C and the groove portion 20D of the outer can 20, and the sealing body 30 closes the opening of the outer can 20.
  • the positive electrode cap 31 is electrically connected to the positive electrode plate 11 via the positive electrode lead 15 and the current collector plate 32, and functions as a positive electrode plate external terminal.
  • the positive electrode cap 31 is a disk-shaped metal member, and has a protruding portion 31A whose central portion in the radial direction D protrudes outside the energy storage device 10, and a flange portion 31B formed around the protruding portion 31A.
  • the positive electrode cap 31 is disposed on the upper surface side of the sealing body 30, and is exposed to the outside of the exterior can 20 to form the top surface of the energy storage device 10.
  • a positive electrode plate tab or the like of the current collector member of the energy storage module is joined to the protruding portion 31A by welding.
  • the current collector 32 is electrically connected to the positive electrode plate 11 via the positive electrode lead 15, and functions as a positive electrode current collector.
  • the current collector 32 is a metal member having a diameter similar to that of the positive electrode cap 31.
  • the current collector 32 is formed in a ring shape with an opening in the center in the radial direction D.
  • the current collector 32 is disposed closer to the electrode body 14 than the positive electrode cap 31.
  • the current collector 32 is welded to the positive electrode cap 31, for example, at a position closer to the outer periphery than the center in the radial direction D of the positive electrode cap 31.
  • the gasket 33 is a rubber or resin member that prevents contact between the positive electrode cap 31 and the current collector plate 32 and the outer can 20, and ensures electrical insulation between the outer can 20 and the sealing body 30.
  • the gasket 33 also seals the gap between the outer can 20 and the sealing body 30, sealing the inside of the energy storage device 10.
  • the gasket 33 is provided between the outer periphery of the stack of the positive electrode cap 31 and the current collector plate 32 and the outer can 20.
  • the gasket 33 covers the upper surface of the flange portion 31B of the positive electrode cap 31, the side surfaces of the positive electrode cap 31 and the current collector plate 32, and the lower surface of the current collector plate 32 at the outer periphery of the stack.
  • the exterior can 20 has a first uneven portion 51 formed in a concave and/or convex shape on the surface of the shoulder portion 20C facing the gasket 33.
  • the gasket 33 has a second uneven portion 52 formed in a concave and/or convex shape on the surface facing the shoulder portion 20C that fits into the first uneven portion 51.
  • the second uneven portion 52 that fits into the first uneven portion 51 also includes the gasket 33, which is an elastic body, being pressed against the first uneven portion 51, causing the gasket 33 to deform to follow the shape of the first uneven portion 51.
  • the power storage device 10 may be mounted on an electric vehicle.
  • high-capacity and high-output power storage devices have become necessary to extend the driving range of electric vehicles.
  • the internal pressure generated during thermal runaway is greater than in conventional power storage devices. For this reason, it is necessary to improve reliability by improving the strength of the sealing structure of the power storage device 10.
  • the first uneven portion 51 and the second uneven portion 52 fit together to increase the frictional force between the shoulder portion 20C and the gasket 33, improving the strength of the sealing structure of the energy storage device 10. This makes it difficult for the sealing body 30 to come off the exterior can 20 during thermal runaway, and prevents the contents of the energy storage device 10 from scattering. As a result, the reliability of the energy storage device 10 can be improved.
  • the first uneven portion 51 is formed in a concave and/or convex shape, which increases the moment of area, thereby improving the strength.
  • the second uneven portion 52 is formed in a concave and/or convex shape, which increases the moment of area, thereby improving the strength. This can increase the strength of the sealing structure of the energy storage device 10.
  • the shoulder portion 20C may have a fifth uneven portion 55 formed on the surface (upper surface) opposite to the surface on which the first uneven portion 51 is formed. The area on which this fifth uneven portion 55 is formed may overlap in the axial direction with the area on which the first uneven portion 51 is formed.
  • the first uneven portion 51 of this embodiment is formed in a continuous uneven shape.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may simply be convex or concave.
  • the first uneven portion 51 of this embodiment is formed in a continuous wave shape.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may be a continuous zigzag shape or a continuous sawtooth shape.
  • the first uneven portion of the present disclosure may be formed with convex or concave shapes scattered throughout.
  • the first uneven portion 51 of this embodiment is formed continuously along the circumferential direction R.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined angle range of the circumferential direction R.
  • the first uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the circumferential direction R.
  • the first uneven portion 51 of this embodiment is formed continuously along the radial direction D.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined range of the radial direction D.
  • the first uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the radial direction D.
  • multiple concave shapes or multiple convex shapes are lined up in the radial direction D, they may be lined up at a predetermined interval in the radial direction D.
  • the first uneven portion 51 may be formed by processing the portion where the shoulder portion 20C is to be formed before the energy storage device 10 is assembled.
  • the first uneven portion 51 and the shoulder portion 20C may be formed, for example, using a mold that rolls and moves in the circumferential direction of the outer can.
  • the first uneven portion 51 may also be formed simultaneously with the second uneven portion 52 described below by processing the shoulder portion 20C after the shoulder portion 20C is crimped.
  • the first uneven portion 51 may also be formed using a mold that rolls and moves in the circumferential direction of the outer can.
  • the second uneven portion 52 of this embodiment is formed in a continuous uneven shape so as to fit into the first uneven portion 51 described above.
  • the second uneven portion 52 of this embodiment is formed continuously along the circumferential direction R.
  • the second uneven portion 52 of this embodiment is formed continuously along the radial direction D.
  • the second uneven portion of the present disclosure is not particularly limited as long as it has a shape that fits into the first uneven portion 51 described above.
  • the second uneven portion 52 may be formed by processing in advance before assembling the energy storage device 10 if the material of the gasket 33 is, for example, PP (polypropylene), PPS (polyphenylene sulfide), PFA (perfluoroalkane), or PBT (polybutylene terephthalate) resin.
  • the second uneven portion 52 may be formed simultaneously with the first uneven portion 51 by plastic deformation or elastic deformation by processing the shoulder portion 20C after the sealing body 30 is crimped.
  • a power storage device 60 according to another embodiment will be described with reference to FIG.
  • the energy storage device 60 is configured by adding a third uneven portion 53 and a fourth uneven portion 54, which will be described in detail later, to the above-mentioned energy storage device 10.
  • a third uneven portion 53 and a fourth uneven portion 54 which will be described in detail later.
  • the positive electrode cap 31 of the sealing body 30 has a third uneven portion 53 formed in a concave and/or convex shape on the surface facing the gasket 33 on the opening side of the outer can 20.
  • the gasket 33 has a fourth uneven portion 54 formed in a concave and/or convex shape on the surface facing the sealing body 30 that fits into the third uneven portion 53.
  • the third uneven portion 53 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength.
  • the fourth uneven portion 54 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength. This improves the strength of the sealing structure of the energy storage device 10.
  • the third uneven portion 53 of this embodiment is formed continuously along the radial direction D.
  • the third uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined range of the radial direction D.
  • the third uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the radial direction D.
  • multiple concave shapes or multiple convex shapes are lined up in the radial direction D, they may be lined up at a predetermined interval in the radial direction D.
  • the third uneven portion 53 is preferably formed on the positive electrode cap 31 by processing the positive electrode cap 31 before assembling the energy storage device 10.
  • the third uneven portion 53 may also be formed simultaneously with the first uneven portion 51, the second uneven portion 52, and the fourth uneven portion 54 described below by processing the positive electrode cap 31 via the gasket 33 by processing the shoulder portion 20C after the sealing body 30 is crimped.
  • the fourth uneven portion 54 of this embodiment is formed in a continuous uneven shape so as to fit into the third uneven portion 53 described above.
  • the fourth uneven portion 54 of this embodiment is formed continuously in the circumferential direction R.
  • the fourth uneven portion 54 of this embodiment is formed continuously in the radial direction D.
  • the fourth uneven portion of the present disclosure is not particularly limited as long as it has a shape that fits into the third uneven portion 53 described above.
  • the fourth uneven portion 54 may be formed by processing in advance before assembling the energy storage device 10 if the material of the gasket 33 is made of resin, for example.
  • the fourth uneven portion 54 may also be formed simultaneously with the first uneven portion 51, the third uneven portion 53, the second uneven portion 52, and the third uneven portion 53 by processing the positive electrode cap 31 via the gasket 33 by processing the shoulder portion 20C after the sealing body 30 is crimped.
  • the region where the second uneven portion 52 is formed and the region where the third uneven portion 53 is formed may overlap in the axial direction P.
  • Configuration 1 An energy storage device comprising: an electrode body in which a first electrode plate and a second electrode plate are wound with a separator interposed therebetween; an electrolyte; a cylindrical outer can with a bottom that contains the electrode body and the electrolyte and has a shoulder extending radially inward from the open end; a sealing body that closes an opening of the outer can; and an annular gasket interposed between the outer can and the sealing body, wherein the outer can has a first uneven portion formed in a concave and/or convex shape on a surface of the shoulder that faces the gasket.
  • Configuration 2 The energy storage device according to configuration 1, wherein the gasket has a second uneven portion on a surface facing the shoulder portion that is formed concave and/or convex and that fits into the first uneven portion.
  • Configuration 3 The power storage device according to configuration 2, wherein the first uneven portion and the second uneven portion are formed continuously along a circumferential direction.
  • Configuration 4 The power storage device according to any one of configurations 1 to 3, wherein the first uneven portion and the second uneven portion are formed continuously along a radial direction.
  • Configuration 5 The energy storage device according to any one of configurations 1 to 4, wherein the sealing body has a third uneven portion formed in a concave and/or convex shape on a surface facing the gasket on the open side of the outer casing, and the gasket has a fourth uneven portion formed in a concave and/or convex shape on a surface facing the sealing body and which fits into the third uneven portion.
  • Configuration 6 The power storage device according to configuration 5, wherein the third uneven portion and the fourth uneven portion are formed continuously along a circumferential direction.
  • Configuration 7 The power storage device according to configuration 5 or 6, wherein the third uneven portion and the fourth uneven portion are formed continuously along a radial direction.
  • Configuration 8 The energy storage device according to any one of configurations 5 to 7, wherein the second uneven portion and the third uneven portion overlap in the axial direction.
  • Configuration 9 The energy storage device according to any one of configurations 1 to 3, wherein a fifth uneven portion is formed on a surface of the shoulder portion opposite to the surface on which the first uneven portion is formed, and the first uneven portion and the fifth uneven portion overlap in the axial direction.
  • a power storage device 110 as another example of the embodiment will be described with reference to FIG.
  • the energy storage device 110 includes a wound electrode body 114 in which a positive electrode plate 111 as a first electrode plate and a negative electrode plate 112 as a second electrode plate are wound with a separator 113 interposed therebetween, an outer can 120 that houses the electrode body 114, and a sealing body 130 that closes the opening of the outer can 120.
  • the outer can 120 houses an electrolyte together with the electrode body 114.
  • the electrolyte in this embodiment is a non-aqueous electrolyte, but may be an aqueous electrolyte.
  • the energy storage device 110 may be a capacitor.
  • the surface of the negative electrode cap 121 facing the shoulder portion 120C of the outer can 120 has a first uneven portion 151 formed in a concave and/or convex shape
  • the surface of the outer can 120 facing the negative electrode cap 121 has a second uneven portion 152 formed in a concave and/or convex shape that fits into the first uneven portion 151 (see FIG. 6).
  • the first uneven portion 151 and the second uneven portion 152 can improve the reliability of the energy storage device 110.
  • the positive electrode plate 111, the negative electrode plate 112, and the separator 113 are all long strips wound in a spiral shape. At this time, the positive electrode plate 111 and the negative electrode plate 112 are stacked in a shifted manner so as to protrude to the opposite side in the axial direction P (height direction of the storage device 110).
  • the composite layer of the negative electrode plate 112 may be formed with a size slightly larger than the composite layer of the positive electrode plate 111 in order to prevent lithium precipitation. In other words, the composite layer of the negative electrode plate 112 may be formed longer in the longitudinal direction and width direction (short direction) than the composite layer of the positive electrode plate 111.
  • the separator 113 is formed with a size at least slightly larger than the positive electrode plate 111, and for example, two separators 113 are arranged to sandwich the positive electrode plate 111.
  • the electrode body 114 does not necessarily have to be configured in a state in which the positive electrode plate 111 and the negative electrode plate 112 are wound.
  • the electrode body 114 may be configured by alternately stacking multiple positive electrode plates 111 and multiple negative electrode plates 112.
  • the positive electrode plate 111 has a positive electrode core and a positive electrode mixture layer formed on at least one surface of the core.
  • a foil of a metal that is stable in the potential range of the positive electrode plate 111, such as aluminum or an aluminum alloy, or a film with the metal disposed on the surface layer is used.
  • the positive electrode mixture layer contains, for example, a positive electrode active material, a conductive agent such as acetylene black, and a binder such as polyvinylidene fluoride, and is preferably formed on both sides of the positive electrode core.
  • a lithium transition metal complex oxide is used as the positive electrode active material.
  • the negative electrode plate 112 has a negative electrode core and a negative electrode mixture layer formed on at least one surface of the core.
  • a foil of a metal that is stable in the potential range of the negative electrode plate 112, such as copper or a copper alloy, or a film with the metal disposed on the surface layer can be used.
  • the negative electrode mixture layer preferably contains, for example, a negative electrode active material and a binder such as styrene-butadiene rubber (SBR), and is formed on both sides of the negative electrode core.
  • SBR styrene-butadiene rubber
  • graphite, a silicon-containing compound, etc. are used as the negative electrode active material.
  • the non-aqueous electrolyte contained in the exterior can 120 includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the non-aqueous solvent include esters, ethers, nitriles, amides, and mixed solvents of two or more of these.
  • the non-aqueous solvent may contain a halogen-substituted compound in which at least a portion of the hydrogen of these solvents is replaced with a halogen atom such as fluorine.
  • non-aqueous solvents include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), and mixed solvents of these.
  • a lithium salt such as LiPF6 is used as the electrolyte salt.
  • the non-aqueous electrolyte may be a gel electrolyte, a solid electrolyte, or the like, instead of an electrolytic solution.
  • a positive electrode lead 115 extending from the upper end of the electrode body 114 in the axial direction P and connecting the positive electrode plate 111 constituting the electrode body 114 and the current collector plate 132 of the sealing body 130, and an upper insulating plate 116 arranged between the electrode body 114 and the sealing body 130.
  • the positive electrode lead 115 electrically connects the positive electrode plate 111 and the sealing body 130. Therefore, the positive electrode cap 131 of the sealing body 130 functions as the first electrode external terminal (positive electrode external terminal).
  • the upper insulating plate 116 prevents the positive electrode plate 111 and the positive electrode lead 115 from touching the outer can 120, and prevents the positive electrode lead 115 from touching the negative electrode plate 112 of the electrode body 114.
  • a negative electrode current collector 135 is provided below the electrode body 114.
  • a negative electrode core material exposed portion (not shown) where no negative electrode mixture layer is provided in the negative electrode core material protrudes below the axial direction P of the negative electrode plate 112.
  • the negative electrode core material exposed portion is formed from the end at the start of winding to the end at the end of winding in the longitudinal direction (circumferential direction R) of the long negative electrode plate 112.
  • the negative electrode core material exposed portion is bonded to the negative electrode current collector 135, and the negative electrode plate 112 and the negative electrode current collector 135 are electrically connected.
  • the negative electrode current collector 135 is bonded to the inner surface of the bottom 120B of the outer can 120, and the negative electrode current collector 135 and the outer can 120 are electrically connected.
  • the outer can and the positive electrode plate may be electrically connected, and the sealing plate and the negative electrode plate may be electrically connected.
  • the positive electrode cap 131 functions as the negative electrode cap
  • the negative electrode cap 121 functions as the positive electrode cap.
  • the outer can 120 is a cylindrical metal container with a bottom that is open at the top end in the axial direction P.
  • the outer can 120 is generally made of a metal whose main component is iron, but when the positive electrode plate 111 is connected, it may be made of a metal whose main component is aluminum or the like.
  • the outer can 120 has a cylindrical tube portion 120A, a circular bottom portion 120B when viewed from the bottom, a shoulder portion 120C that extends inward in the circumferential direction R from the open end of the tube portion 120A and is formed in an annular shape, and a groove portion 120D that is formed along the circumferential direction R of the tube portion 120A.
  • the outer can 120 is also provided with a negative electrode cap 121 as a second electrode external terminal (negative electrode external terminal).
  • the groove portion 120D is formed at a position a predetermined length away from the shoulder portion 120C near the opening of the outer can 120.
  • the groove portion 120D is a portion of the tubular portion 120A that protrudes inwardly of the outer can 120, and is formed, for example, by spinning the tubular portion 120A from the outside.
  • the outer can 120 is reduced in diameter, and a thin groove is formed on the outer peripheral surface of the tubular portion 120A.
  • the groove portion 120D has a generally U-shaped cross section, and is preferably formed in a ring shape over the entire length of the tubular portion 120A in the circumferential direction R.
  • the bottom 120B of the exterior can 120 may be provided with a safety valve mechanism that operates when an abnormality occurs in the energy storage device 110.
  • a circular marking may be formed on the bottom 120B as a safety valve mechanism. When an abnormality occurs in the energy storage device 110 and the internal pressure rises, this marking may be broken preferentially, and a gas exhaust port may be formed in the bottom 120B.
  • the negative electrode current collector 135 also serves as the bottom 120B, a marking may be formed on the negative electrode current collector 135, and when the internal pressure of the energy storage device 110 reaches a predetermined level or higher, the marking may be broken to allow exhaust.
  • the negative electrode cap 121 is electrically connected to the negative electrode plate 112 via the outer can 120 and functions as a negative electrode external terminal.
  • the negative electrode cap 121 is formed in a ring shape with an opening in the center in the radial direction D.
  • the negative electrode cap 121 is welded to the cylindrical portion 120A of the outer can 120 and is electrically connected to the outer can 120.
  • the negative electrode cap 121 has an annular top plate portion 121A that faces the shoulder portion 120C in the axial direction, and a cylindrical skirt portion 121B that extends from the outer periphery of the top plate portion 121A toward the groove portion 120D in the axial direction P.
  • a part of the skirt portion 121B (for example, the lower end of the skirt portion 121B) is crimped so as to enter the recess of the groove portion 120D.
  • the opening and the first uneven portion 151 are provided in the top plate portion 121A.
  • the skirt portion 121B is not essential for the negative electrode cap 121.
  • the top plate portion 121A may be joined to the shoulder portion 120C by welding or the like.
  • the portion of the skirt portion 121B that is crimped to the groove portion 120D may be formed to extend continuously in an annular shape in the circumferential direction R of the exterior can 120, or may be formed intermittently in the circumferential direction R.
  • the holding strength of the shoulder portion 120C on the straight line is increased compared to an energy storage device using a negative electrode cap 121 that does not have the skirt portion 121B.
  • the sealing body 130 is formed in a disk shape overall, and includes a positive electrode cap 131, a current collector plate 132, a gasket 133, and an insulating member 134.
  • the sealing body 130 is placed on the groove portion 120D of the outer can 120, and is fixed to the upper end of the outer can 120. More specifically, the shoulder portion 120C of the outer can 120 is bent inward in the radial direction D and crimped against the sealing body 130, and the sealing body 130 is fixed to the upper end of the outer can 120 by the shoulder portion 120C and the groove portion 120D of the outer can 120, and the sealing body 130 closes the opening of the outer can 120.
  • the positive electrode cap 131 is electrically connected to the positive electrode plate 111 via the positive electrode lead 115 and the current collector plate 132, and functions as a positive electrode external terminal.
  • the positive electrode cap 131 is a disk-shaped metal member, and has a protruding portion 131A whose central portion in the radial direction D protrudes outside the power storage device 110, and a flange portion 131B formed around the protruding portion 131A.
  • the positive electrode cap 131 is disposed on the upper surface side of the sealing body 130, and is exposed to the outside of the exterior can 120 to form the top surface of the power storage device 110.
  • a positive electrode tab or the like of the current collector of the power storage module is joined to the protruding portion 131A by welding.
  • the current collector 132 is electrically connected to the positive electrode plate 111 via the positive electrode lead 115, and functions as a positive electrode current collector.
  • the current collector 132 is a metal member having a diameter similar to that of the positive electrode cap 131.
  • the current collector 132 is formed in a ring shape with an opening in the center in the radial direction D.
  • the current collector 132 is disposed closer to the electrode body 114 than the positive electrode cap 131.
  • the current collector 132 is welded to the positive electrode cap 131, for example, at a position closer to the outer periphery than the center in the radial direction D of the positive electrode cap 131.
  • the gasket 133 is a rubber or resin member that prevents contact between the positive electrode cap 131 and the current collector plate 132 and the exterior can 120, and ensures electrical insulation between the exterior can 120 and the sealing body 130.
  • the gasket 133 also seals the gap between the exterior can 120 and the sealing body 130, sealing the inside of the energy storage device 110.
  • the gasket 133 is provided between the outer periphery of the stack of the positive electrode cap 131 and the current collector plate 132 and the exterior can 120.
  • the gasket 133 covers the upper surface of the flange portion 131B of the positive electrode cap 131, the sides of the positive electrode cap 131 and the current collector plate 132, and the lower surface of the current collector plate 132 at the outer periphery of the stack.
  • the insulating member 134 is a rubber or resin member that prevents contact between the positive electrode cap 131 and the negative electrode cap 121 and ensures electrical insulation between the positive electrode cap 131 and the negative electrode cap 121.
  • the insulating member 134 is formed in a ring shape with an opening in the center in the radial direction D.
  • the negative electrode cap 121 has a first uneven portion 151 formed in a concave and/or convex shape on the surface facing the positive electrode cap 131.
  • the shoulder portion 120C of the exterior can 120 has a second uneven portion 152 formed in a concave and/or convex shape on the surface facing the negative electrode cap 121 that fits into the first uneven portion 151.
  • the second uneven portion 152 that fits into the first uneven portion 151 also includes the gasket 133, which is an elastic body, being pressed against the first uneven portion 151 and deforming to follow the shape of the first uneven portion 151.
  • the power storage device 110 may be mounted on an electric vehicle.
  • high-capacity and high-output power storage devices have become necessary to extend the driving range of electric vehicles.
  • the internal pressure generated during thermal runaway is greater than in conventional power storage devices. For this reason, it is necessary to improve the strength of the sealing structure of the power storage device 110 to improve its reliability.
  • the first uneven portion 151 and the second uneven portion 152 fit together to increase the frictional force between the shoulder portion 120C and the gasket 133, improving the strength of the sealing structure of the energy storage device 110. This makes it difficult for the sealing body 130 to come off the exterior can 120 during thermal runaway, and prevents the contents of the energy storage device 110 from scattering. As a result, the reliability of the energy storage device 110 can be improved.
  • first uneven portion 151 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength.
  • second uneven portion 152 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength. This improves the strength of the sealing structure of the energy storage device 110.
  • the negative electrode cap 121 can be engaged with the second uneven portion 152 and the groove portion 120D to hold the shoulder portion 120C more firmly than a negative electrode cap that does not have the skirt portion 121B, and deformation of the shoulder portion 120C can be suppressed.
  • the negative electrode cap 121 may have a seventh uneven portion 157 formed on the surface (upper surface) opposite to the surface on which the first uneven portion 151 is formed. The area on which this seventh uneven portion 157 is formed may overlap the area on which the first uneven portion 151 is formed in the axial direction P.
  • the convex portion of the first uneven portion 151 may be formed to be thicker than the remaining part of the negative electrode cap 121.
  • the first uneven portion 151 of this embodiment is formed in a continuous uneven shape.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may simply be convex or concave.
  • the first uneven portion 151 of this embodiment is formed in a continuous wave shape.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may be a continuous zigzag shape or a continuous sawtooth shape.
  • the first uneven portion of the present disclosure may be formed with convex or concave shapes scattered throughout.
  • the first uneven portion 151 of this embodiment is formed continuously along the circumferential direction R.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined angle range of the circumferential direction R.
  • the first uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the circumferential direction R.
  • the first uneven portion 151 of this embodiment is formed continuously along the radial direction D.
  • the first uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined range of the radial direction D.
  • the first uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the radial direction D.
  • multiple concave shapes or multiple convex shapes are lined up in the radial direction D, they may be lined up at a predetermined interval in the radial direction D.
  • the first uneven portion 151 may be formed on the negative electrode cap 121 by processing the negative electrode cap 121 before assembling the energy storage device 110.
  • the first uneven portion 151 may also be formed using a mold that rolls and moves on the negative electrode cap 121 in the circumferential direction R.
  • the first uneven portion 151 may be formed simultaneously with the second uneven portion 152 described below by processing the negative electrode cap 121 after the negative electrode cap 121 is joined to the shoulder portion 120C.
  • the second uneven portion 152 of this embodiment is formed in a continuous uneven shape so as to fit into the first uneven portion 151 described above.
  • the second uneven portion 152 of this embodiment is formed continuously in the circumferential direction R.
  • the second uneven portion 152 of this embodiment is formed continuously in the radial direction D.
  • the second uneven portion of the present disclosure is not particularly limited as long as it has a shape that fits into the first uneven portion described above.
  • the second uneven portion 152 may be formed by processing in advance before assembling the energy storage device 110.
  • the second uneven portion 152 may be formed using, for example, a mold that rolls and moves in the circumferential direction R of the outer can 120.
  • the second uneven portion 152 may also be formed simultaneously with the first uneven portion 151 by processing the negative electrode cap 121 after the negative electrode cap 121 is joined to the shoulder portion 120C.
  • the first uneven portion 151 and the second uneven portion 152 may also be formed using a mold that rolls and moves on the negative electrode cap 121 in the circumferential direction R.
  • a power storage device 160 according to another embodiment will be described with reference to FIG.
  • the energy storage device 160 is configured by adding a third uneven portion 153 and a fourth uneven portion 154, which will be described in detail later, to the above-mentioned energy storage device 110.
  • the same members as those in the above-mentioned energy storage device 110 are designated by the same reference numerals and will not be described again, and only the members that differ from the above-mentioned energy storage device 110 will be described.
  • the shoulder portion 120C of the exterior can 120 has a third uneven portion 153 formed in a concave and/or convex shape on the surface facing the gasket 133.
  • the gasket 133 further has a fourth uneven portion 154 formed in a concave and/or convex shape on the surface facing the shoulder portion 120C that fits into the third uneven portion 153.
  • the third uneven portion 153 and the fourth uneven portion 154 fit together to increase the frictional force between the shoulder portion 120C and the gasket 133, improving the strength of the sealing structure of the energy storage device 110. This makes it difficult for the sealing body 130 to come off the exterior can 120 during thermal runaway, and prevents the contents of the energy storage device 110 from scattering. As a result, the reliability of the energy storage device 110 can be improved.
  • the third uneven portion 153 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength.
  • the fourth uneven portion 154 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength. This makes it possible to improve the strength of the sealing structure of the energy storage device 110.
  • the third uneven portion 153 of this embodiment is formed in a continuous uneven shape.
  • the third uneven portion of the present disclosure is not limited to this embodiment, and may simply be a convex or concave shape.
  • the third uneven portion 153 of this embodiment is formed in a continuous wave shape.
  • the third uneven portion of the present disclosure is not limited to this embodiment, and may be a continuous zigzag shape or a continuous sawtooth shape.
  • the sixth uneven portion of the present disclosure may be formed with convex or concave shapes scattered throughout.
  • the third uneven portion 153 of this embodiment is formed continuously along the circumferential direction R.
  • the third uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined angle range of the circumferential direction R.
  • the third uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the circumferential direction R.
  • the third uneven portion 153 of this embodiment is formed continuously along the radial direction D.
  • the third uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined range of the radial direction D.
  • the third uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the radial direction D.
  • multiple concave shapes or multiple convex shapes are lined up in the radial direction D, they may be lined up at a predetermined interval in the radial direction D.
  • the third uneven portion 153 is preferably formed at the same time as the second uneven portion 152 described above.
  • the area where the second uneven portion 152 is formed and the area where the third uneven portion 153 is formed may overlap in the axial direction P.
  • the fourth uneven portion 154 of this embodiment is formed in a continuous uneven shape so as to fit into the third uneven portion 153 described above.
  • the fourth uneven portion 154 of this embodiment is formed continuously along the circumferential direction R.
  • the fourth uneven portion 154 of this embodiment is formed continuously along the radial direction D.
  • the third uneven portion of the present disclosure is not particularly limited as long as it has a shape that fits into the third uneven portion described above.
  • the fourth uneven portion 154 may be formed by processing in advance before assembling the energy storage device 110 if the material of the gasket 133 is made of a resin such as PP (polypropylene), PPS (polyphenylene sulfide), PFA (perfluoroalkane), or PBT (polybutylene terephthalate).
  • the fourth uneven portion 154 may also be formed simultaneously with the second uneven portion 152 and the third uneven portion 153 by plastic deformation or elastic deformation by processing the shoulder portion 120C after the sealing body 130 is crimped.
  • the energy storage device 170 is configured by adding a sixth uneven portion 155 and a fifth uneven portion, which will be described in detail later, to the energy storage device 160 described above.
  • the positive electrode cap 131 of the sealing body 130 has a sixth uneven portion 155 formed in a concave and/or convex shape on the surface facing the gasket 133 on the opening side of the outer can 120.
  • the gasket 133 further has a fifth uneven portion 156 formed in a concave and/or convex shape on the surface facing the sealing body 130, which fits into the sixth uneven portion 155.
  • the sixth uneven portion 155 and the fifth uneven portion 156 fit together to increase the frictional force between the gasket 133 and the sealing body 130 (positive electrode cap 131), thereby improving the strength of the sealing structure of the energy storage device 110.
  • This makes it difficult for the sealing body 130 to come off the exterior can 120 during thermal runaway, and prevents the contents of the energy storage device 110 from scattering. As a result, the reliability of the energy storage device 110 can be improved.
  • the sixth uneven portion 155 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength.
  • the fifth uneven portion 156 is formed in a concave and/or convex shape, which increases the second moment of area and improves the strength. This improves the strength of the sealing structure of the energy storage device 110.
  • the sixth uneven portion 155 of this embodiment is formed in a continuous uneven shape.
  • the sixth uneven portion of the present disclosure is not limited to this embodiment, and may simply be convex or concave.
  • the sixth uneven portion 155 of this embodiment is formed in a continuous wave shape.
  • the sixth uneven portion of the present disclosure is not limited to this embodiment, and may be a continuous zigzag shape or a continuous sawtooth shape.
  • the sixth uneven portion of the present disclosure may be formed with convex or concave shapes scattered throughout.
  • the sixth uneven portion 155 of this embodiment is formed continuously along the circumferential direction R.
  • the sixth uneven portion of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined angle range of the circumferential direction R.
  • the sixth uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the circumferential direction R.
  • the sixth uneven portion 155 of this embodiment is formed continuously along the radial direction D.
  • the sixth uneven portion 155 of the present disclosure is not limited to this embodiment, and may be formed only in a predetermined range of the radial direction D.
  • the sixth uneven portion of the present disclosure may be formed with convex or concave shapes scattered in the radial direction D.
  • multiple concave shapes or multiple convex shapes are lined up in the radial direction D, they may be lined up at a predetermined interval in the radial direction D.
  • the sixth uneven portion 155 is preferably formed by processing the positive electrode cap 131 before assembling the energy storage device 110.
  • the fifth uneven portion 156 of this embodiment is formed in a continuous uneven shape so as to fit into the sixth uneven portion 155 described above.
  • the fifth uneven portion 156 is formed continuously along the circumferential direction R.
  • the fifth uneven portion 156 is also formed continuously along the radial direction D.
  • the fifth uneven portion of the present disclosure is not particularly limited as long as it has a shape that fits into the sixth uneven portion described above.
  • Configuration 1 An energy storage device comprising: an electrode assembly in which a first electrode plate and a second electrode plate are wound with a separator interposed therebetween; an electrolyte; a bottomed cylindrical outer can that contains the electrode assembly and the electrolyte and has a shoulder extending radially inward from an open end; a sealing body that closes an opening of the outer can; a ring-shaped gasket that is interposed between the outer can and the sealing body; and a second electrode terminal that is provided on the open side of the outer can and is electrically connected to the outer can, wherein the second electrode terminal has a first uneven portion that is formed in a concave and/or convex shape on a surface that faces the shoulder of the outer can, and the outer can has a second uneven portion that is formed in a concave and/or convex shape on a surface of the shoulder that faces the second electrode terminal and fits into the first uneven portion.
  • Configuration 2 The power storage device according to configuration 1, wherein the first uneven portion and the second uneven portion are formed continuously along a circumferential direction.
  • Configuration 3 The power storage device according to configuration 1 or 2, wherein the first uneven portion and the second uneven portion are formed continuously along a radial direction.
  • Configuration 4 The energy storage device according to any one of configurations 1 to 3, wherein the exterior can has a third uneven portion formed concavely and/or convexly on a surface of the shoulder portion facing the gasket, and the gasket has a fourth uneven portion formed concavely and/or convexly on a surface facing the shoulder portion and fitted into the third uneven portion.
  • Configuration 12 The energy storage device according to configuration 1, wherein an annular groove is formed on an outer peripheral surface of the exterior can, the second electrode terminal has an annular top plate portion facing the shoulder portion and a cylindrical skirt portion extending in the axial direction from the top plate portion toward the groove portion, and the first uneven portion is formed on the top plate portion, and a portion of the skirt portion is bent so as to enter the groove portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2024/011042 2023-03-31 2024-03-21 蓄電装置 Ceased WO2024203729A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP24779849.9A EP4693634A1 (en) 2023-03-31 2024-03-21 Power storage device
JP2025510648A JPWO2024203729A1 (https=) 2023-03-31 2024-03-21
CN202480019880.9A CN120883426A (zh) 2023-03-31 2024-03-21 蓄电装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2023-058094 2023-03-31
JP2023058094 2023-03-31
JP2023058179 2023-03-31
JP2023-058179 2023-03-31

Publications (1)

Publication Number Publication Date
WO2024203729A1 true WO2024203729A1 (ja) 2024-10-03

Family

ID=92905011

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/011042 Ceased WO2024203729A1 (ja) 2023-03-31 2024-03-21 蓄電装置

Country Status (4)

Country Link
EP (1) EP4693634A1 (https=)
JP (1) JPWO2024203729A1 (https=)
CN (1) CN120883426A (https=)
WO (1) WO2024203729A1 (https=)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01111455U (https=) * 1988-01-22 1989-07-27
US5935731A (en) * 1997-11-20 1999-08-10 Voltec Pte. Ltd. Cylindrical battery
US20120028090A1 (en) * 2009-09-14 2012-02-02 Oh Kyung-Su Secondary battery
JP2012174563A (ja) 2011-02-23 2012-09-10 Gs Yuasa Corp 電池
US20180097215A1 (en) * 2016-09-30 2018-04-05 Lg Chem, Ltd. Cylindrical Battery Cell Comprising Metal Can Having Groove
WO2019194055A1 (ja) * 2018-04-06 2019-10-10 パナソニック株式会社 電池
WO2020110888A1 (ja) * 2018-11-30 2020-06-04 パナソニックＩｐマネジメント株式会社 電池

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01111455U (https=) * 1988-01-22 1989-07-27
US5935731A (en) * 1997-11-20 1999-08-10 Voltec Pte. Ltd. Cylindrical battery
US20120028090A1 (en) * 2009-09-14 2012-02-02 Oh Kyung-Su Secondary battery
JP2012174563A (ja) 2011-02-23 2012-09-10 Gs Yuasa Corp 電池
US20180097215A1 (en) * 2016-09-30 2018-04-05 Lg Chem, Ltd. Cylindrical Battery Cell Comprising Metal Can Having Groove
WO2019194055A1 (ja) * 2018-04-06 2019-10-10 パナソニック株式会社 電池
WO2020110888A1 (ja) * 2018-11-30 2020-06-04 パナソニックＩｐマネジメント株式会社 電池

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4693634A1

Also Published As

Publication number Publication date
CN120883426A (zh) 2025-10-31
JPWO2024203729A1 (https=) 2024-10-03
EP4693634A1 (en) 2026-02-11

Similar Documents

Publication Publication Date Title
JP7320491B2 (ja) 電池
CN209747563U (zh) 顶盖组件以及二次电池
JPWO2019194227A1 (ja) 電池
US20250201936A1 (en) Electrode for secondary batteries
CN102195013A (zh) 非水电解液圆筒型电池
WO2019194253A1 (ja) 電池
JP7432881B2 (ja) 電池
WO2024143319A1 (ja) 蓄電装置および蓄電モジュール
CN220138483U (zh) 电池上盖组件、电池单体、二次电池和车辆
JP4356209B2 (ja) 高出力用途向け電池
EP4661196A1 (en) Power storage device
EP4614718A1 (en) Power storage device
US20250219261A1 (en) Power storage device
WO2024203729A1 (ja) 蓄電装置
CN118451601A (zh) 集电板和蓄电装置
EP4661195A1 (en) Power storage device
EP4675724A1 (en) Cylindrical battery
EP4661197A1 (en) Power storage device
WO2025028548A1 (ja) 蓄電装置
WO2024161920A1 (ja) 円筒形電池
WO2024162017A1 (ja) 蓄電装置
WO2025094752A1 (ja) 円筒形二次電池
WO2024181468A1 (ja) 蓄電装置
JP2024008475A (ja) 電池
WO2024181423A1 (ja) 蓄電装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24779849

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2025510648

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025510648

Country of ref document: JP

Ref document number: 202480019880.9

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2024779849

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 202480019880.9

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

ENP Entry into the national phase

Ref document number: 2024779849

Country of ref document: EP

Effective date: 20251031

WWP Wipo information: published in national office

Ref document number: 2024779849

Country of ref document: EP