WO2023214511A1 - 蓄電モジュール - Google Patents

蓄電モジュール Download PDF

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Publication number
WO2023214511A1
WO2023214511A1 PCT/JP2023/015783 JP2023015783W WO2023214511A1 WO 2023214511 A1 WO2023214511 A1 WO 2023214511A1 JP 2023015783 W JP2023015783 W JP 2023015783W WO 2023214511 A1 WO2023214511 A1 WO 2023214511A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
frame member
sealing body
storage module
sealing
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/JP2023/015783
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
夕紀 岡本
慎太郎 山岡
文彦 石黒
貴之 弘瀬
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.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
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 Toyota Industries Corp filed Critical Toyota Industries Corp
Priority to US18/860,985 priority Critical patent/US20250357635A1/en
Priority to JP2024519191A priority patent/JP7740533B2/ja
Priority to CN202380037842.1A priority patent/CN119137790A/zh
Publication of WO2023214511A1 publication Critical patent/WO2023214511A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • 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
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—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
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • 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
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/029—Bipolar electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to a power storage module.
  • Patent Document 1 describes an electricity storage module.
  • This power storage module includes an electrode stack including a plurality of electrodes stacked with separators in between, and a sealing body disposed to surround the electrode stack.
  • the sealing body includes a first resin part provided at the peripheral edge of the electrode plate, and a second resin part provided outside the plurality of first resin parts so as to surround the plurality of first resin parts. .
  • the sealing body is provided with a plurality of communication holes communicating with mutually different internal spaces formed between the electrodes. The communication hole is used, for example, to supply an electrolytic solution to the internal space.
  • a plurality of communicating hole regions each having the same number of communicating holes are formed in one of the four wall sections constituting the sealing body.
  • the electrolytic solution is supplied to the internal space in a state where the tip end face of the nozzle of the electrolytic solution supply device is pressed against the communication hole region of the sealing body through the packing.
  • the packing is strongly compressed at the plurality of protrusions provided in the communication hole region so as to surround each of the plurality of communication holes.
  • Patent Document 2 describes an electricity storage module.
  • This power storage module includes an electrode stack including a plurality of electrodes stacked with separators in between, a frame arranged to surround the electrode stack, and a pressure regulating valve attached to the frame.
  • the frame includes a first sealing part provided at the peripheral edge of the electrode plate, and a second sealing part provided outside the first sealing part.
  • One wall that constitutes the frame is provided with a plurality of attachment areas for attaching pressure regulating valves.
  • the frame In each attachment region, the frame is provided with a communication hole that communicates with the internal space formed between the electrodes.
  • the communication hole is used, for example, to supply an electrolytic solution to the internal space.
  • the communication hole can be sealed by attaching the pressure regulating valve to the attachment area.
  • the frame body is provided with a frame-shaped protrusion in the attachment region, and is used for joining the pressure regulating valve by heat welding.
  • JP2020-035665A Japanese Patent Application Publication No. 2021-009795
  • frame-shaped protrusions and protrusions are formed together with the second resin part and the second sealing part by injection molding.
  • a laminate formed by stacking electrode plates provided with a first sealing part is placed in an injection mold and resin is injected into the second sealing part.
  • a frame-shaped protrusion is formed together with the stop portion.
  • the resin injected into the mold flows over the entire outer surface including the opening of the communication hole of the first sealing part.
  • defects such as the communicating holes being blocked by the resin may occur, leading to a decrease in reliability.
  • An object of the present disclosure is to provide a power storage module that can suppress a decrease in reliability.
  • a power storage module includes an electrode stack including a current collector and an active material layer formed on the current collector, and includes an electrode stack including a plurality of electrodes stacked along a first direction, and an adjacent current collector.
  • a sealing body provided on the electrode stack so as to form an internal space between the electrodes and sealing the internal space, an electrolytic solution accommodated in the internal space, and a separate body from the sealing body.
  • a frame member joined to the sealing body by a frame member, and the sealing body includes a plurality of frame-shaped seal members provided on the peripheral edge of each of the plurality of current collectors, and a frame member joined to the seal member in the first direction.
  • a plurality of spacers are interposed between the materials and form an internal space between the current collectors together with a plurality of sealing materials, and the ends of the plurality of sealing materials and the plurality of spacers opposite to the internal space are welded together.
  • the sealing body provided in the electrode stack is provided with a communication hole that communicates with the internal space that accommodates the electrolytic solution between the current collectors of the electrodes.
  • the sealing body includes a welded end portion formed by welding a sealing material provided on the peripheral edge of the current collector and an end of a spacer interposed between the sealing materials.
  • the opening of the communication hole described above is formed on the outer surface of this welded end.
  • the sealing body is provided with a frame member having a frame portion surrounding the opening of the communication hole on the outer surface of the welded end. Therefore, for example, the frame member can be used for sealing by pressing a nozzle when injecting electrolytic solution, or when joining another member to the sealing body.
  • the frame member is configured separately from the sealing body, and is joined to the sealing body at a portion surrounding the opening of the communication hole on the outer surface. According to this, unlike the case where the frame member is integrally formed with the sealing body by injection molding, defects such as the communication hole being blocked by the resin for injection molding are less likely to occur. Therefore, deterioration in reliability is suppressed.
  • the frame member may further include a flange that protrudes along the outer surface from the end on the first end surface side of each of the plurality of frame portions and is joined to the outer surface.
  • a flange that protrudes along the outer surface from the end on the first end surface side of each of the plurality of frame portions and is joined to the outer surface.
  • the flange may protrude from the frame toward the inside of the area surrounded by the frame when viewed from the second direction. In this case, it is possible to obtain the above-mentioned effects of having the flange while maintaining the external dimensions of the frame member.
  • the power storage module includes a plurality of frame members arranged along a third direction that intersects the first direction and the second direction and is a direction along the outer surface, and each of the plurality of frame members includes: A group of mutually different openings arranged along the first direction when viewed from the second direction are arranged so as to be surrounded by the frame, and the flange protrudes from the frame along the third direction. It's okay. In this way, by using a plurality of frame members and providing a flange on each frame member, it is possible to reliably reduce the stress applied to the sealing body side.
  • the plurality of frame members may include a frame member having an asymmetric shape in the first direction by including at least two frame portions having different sizes in the first direction.
  • the frame member is arranged such that one of the two frame parts having different sizes in the first direction faces toward one side (e.g., upper side) in the first direction than the other, and vice versa.
  • the position of the area surrounded by the frame in the first direction can be changed depending on the case where the frame member is arranged in the first direction. Therefore, it is possible to surround the openings of the plurality of communication holes having different positions in the first direction with fewer types of frame members (that is, while reducing the number of parts) without interference.
  • the sealing body is made of resin
  • the frame member is made of a resin that has the same base material as the resin of the sealing body and has a melting point higher than the melting point of the resin of the sealing body. It's okay to be. In this case, when the frame member is joined to the sealing body by welding, for example, deformation of the frame member due to contraction is suppressed.
  • a power storage module that can improve reliability can be provided.
  • FIG. 1 is a schematic cross-sectional view of a power storage module according to this embodiment.
  • FIG. 2 is a schematic cross-sectional view showing an enlarged part of the electricity storage module shown in FIG. 1.
  • FIG. FIG. 3 is a schematic side view of the electricity storage module shown in FIG. 1.
  • FIG. 4 is a schematic cross-sectional view showing a plurality of examples of the frame member shown in FIG. 5 is a schematic cross-sectional view for explaining one step of the method for manufacturing the electricity storage module shown in FIGS. 1 to 4.
  • FIG. 5 is a schematic cross-sectional view for explaining one step of the method for manufacturing the electricity storage module shown in FIGS. 1 to 4.
  • FIG. 7 is a schematic plan view showing a frame member according to a modification.
  • FIG. 8 is a schematic cross-sectional view of the frame member shown in FIG. 7. It is a figure which shows the process of providing the frame member shown in FIG. 7, 8. It is a figure which shows the process of providing the frame member shown in FIG. 7,
  • a rectangular coordinate system defined by a coordinate axis indicating a first direction D1, a coordinate axis indicating a second direction D2, and a coordinate axis indicating a third direction D3 is shown.
  • FIG. 1 is a schematic cross-sectional view of the electricity storage module according to the present embodiment.
  • a power storage module 1 shown in FIG. 1 is, for example, a power storage module used in batteries of various vehicles such as a forklift, a hybrid vehicle, and an electric vehicle.
  • the power storage module 1 is, for example, a secondary battery such as a nickel metal hydride secondary battery or a lithium ion secondary battery.
  • the power storage module 1 may be an electric double layer capacitor or an all-solid-state battery.
  • the power storage module 1 is a lithium ion secondary battery.
  • the power storage module 1 includes an electrode laminate 10, a sealing body 20, a frame member 30, and a sheet member 40.
  • the electrode stack 10 includes a plurality of electrodes stacked along the first direction D1.
  • the first direction D1 is the stacking direction of the electrodes, and is the height direction of the power storage module 1.
  • the plurality of electrodes include a plurality of bipolar electrodes 11, a positive terminal electrode 12, and a negative terminal electrode 13.
  • a separator 14 is interposed between adjacent electrodes.
  • the electrode stack 10 is formed by stacking a plurality of bipolar electrodes 11 between a positive terminal electrode 12 and a negative terminal electrode 13.
  • the bipolar electrode 11 has a current collector 15 , a positive electrode active material layer 16 , and a negative electrode active material layer 17 .
  • the current collector 15 has a rectangular sheet shape, for example.
  • Current collector 15 includes a first main surface 15a that is one surface, and a second main surface 15b that is the other surface opposite to first main surface 15a. That is, the current collector 15 has a first main surface 15a and a second main surface 15b that are opposite to each other in the stacking direction D.
  • the positive electrode active material layer 16 is provided on the first main surface 15a of the current collector 15.
  • the negative electrode active material layer 17 is provided on the second main surface 15b of the current collector 15.
  • the plurality of bipolar electrodes 11 are stacked such that the positive electrode active material layer 16 of one bipolar electrode 11 and the negative electrode active material layer 17 of another bipolar electrode 11 face each other.
  • the first main surface 15a of the current collector 15 is a surface facing one direction in the first direction D1
  • the second main surface 15b of the current collector 15 is a surface facing the other direction in the first direction D1. .
  • the positive electrode active material layer 16 and the negative electrode active material layer 17 have a rectangular shape when viewed from the first direction D1.
  • the negative electrode active material layer 17 is one size larger than the positive electrode active material layer 16 when viewed from the first direction D1. That is, in a plan view seen from the first direction D1, the entire formation region of the positive electrode active material layer 16 is located within the formation region of the negative electrode active material layer 17.
  • the positive terminal electrode 12 includes a current collector 15 and a positive active material layer 16 provided on the first main surface 15a of the current collector 15.
  • the positive terminal electrode 12 does not have the positive active material layer 16 and the negative active material layer 17 on the second main surface 15b of the current collector 15. That is, the second main surface 15b of the current collector 15 of the positive terminal electrode 12 is not provided with an active material layer.
  • the second main surface 15b of the current collector 15 of the positive terminal electrode 12 serves as the positive terminal surface of the power storage module 1.
  • the positive terminal electrode 12 is stacked on the bipolar electrode 11 at one end of the electrode stack 10 in the first direction D1.
  • the positive terminal electrode 12 is stacked on the bipolar electrode 11 such that the positive active material layer 16 faces the negative active material layer 17 of the bipolar electrode 11 .
  • the negative terminal electrode 13 includes a current collector 15 and a negative active material layer 17 provided on the second main surface 15b of the current collector 15.
  • the negative terminal electrode 13 does not have the positive active material layer 16 and the negative active material layer 17 on the first main surface 15 a of the current collector 15 . That is, the first main surface 15a of the current collector 15 of the negative terminal electrode 13 is not provided with an active material layer.
  • the first main surface 15a of the current collector 15 of the negative terminal electrode 13 serves as a negative terminal surface of the power storage module 1.
  • the negative terminal electrode 13 is stacked on the bipolar electrode 11 at the other end of the electrode stack 10 in the first direction D1. That is, the negative terminal electrode 13 is arranged on the opposite side of the positive terminal electrode 12 with respect to the plurality of bipolar electrodes 11.
  • the negative terminal electrode 13 is stacked on the bipolar electrode 11 such that its negative active material layer 17 faces the positive active material layer 16 of the bipolar electrode 11 .
  • the separators 14 are arranged between adjacent bipolar electrodes 11 in the first direction D1, between the positive terminal electrode 12 and the bipolar electrode 11, and between the negative terminal electrode 13 and the bipolar electrode 11, respectively. Separator 14 is interposed between positive electrode active material layer 16 and negative electrode active material layer 17. By separating the positive electrode active material layer 16 and the negative electrode active material layer 17, the separator 14 prevents short circuits due to contact between adjacent electrodes while allowing charge carriers such as lithium ions to pass through.
  • the current collector 15 is a chemically inert electrical conductor that allows current to continue flowing through the positive electrode active material layer 16 and the negative electrode active material layer 17 during discharging or charging of the lithium ion secondary battery.
  • the material of the current collector 15 is, for example, a metal material, a conductive resin material, or a conductive inorganic material.
  • the conductive resin material include resins in which a conductive filler is added to a conductive polymer material or a non-conductive polymer material as necessary.
  • Current collector 15 may include multiple layers. In this case, each layer of the current collector 15 may contain the above metal material or conductive resin material.
  • a coating layer may be formed on the surface of the current collector 15.
  • the coating layer may be formed by a known method such as plating or spray coating.
  • the current collector 15 may have, for example, a plate shape, a foil shape (eg, metal foil), a film shape, or a mesh shape.
  • the metal foil include aluminum foil, copper foil, nickel foil, titanium foil, and stainless steel foil.
  • the current collector 15 may be an alloy foil of the metal described above or a plurality of metal foils integrated by bonding or the like.
  • the thickness of the current collector 15 may be, for example, 1 ⁇ m to 100 ⁇ m. Note that, for example, among the current collectors 15 of the bipolar electrode 11, the positive terminal electrode 12, and the negative terminal electrode 13, some of the current collectors 15 may have a thickness of 100 ⁇ m or more. In this case, the structural stability of the electrode stack 10 increases.
  • the positive electrode active material layer 16 includes a positive electrode active material that can insert and release charge carriers such as lithium ions.
  • the positive electrode active material include lithium composite metal oxides having a layered rock salt structure, metal oxides having a spinel structure, and polyanionic compounds.
  • the positive electrode active material may be any material that can be used in lithium ion secondary batteries.
  • the positive electrode active material layer 16 may include a plurality of positive electrode active materials.
  • the positive electrode active material layer 16 contains olivine-type lithium iron phosphate (LiFePO 4 ) as a composite oxide.
  • the negative electrode active material layer 17 includes a negative electrode active material that can insert and release charge carriers such as lithium ions.
  • the negative electrode active material may be a single substance, an alloy, or a compound.
  • Examples of the negative electrode active material include Li, carbon, and metal compounds.
  • the negative electrode active material may be an element that can be alloyed with lithium, a compound thereof, or the like.
  • Examples of carbon include natural graphite, artificial graphite, hard carbon (hardly graphitizable carbon), and soft carbon (easily graphitizable carbon).
  • Examples of the artificial graphite include highly oriented graphite, mesocarbon microbeads, and the like.
  • Examples of elements that can be alloyed with lithium include silicon, tin, and the like.
  • the negative electrode active material layer 17 contains graphite as a carbon-based material.
  • Each of the positive electrode active material layer 16 and the negative electrode active material layer 17 may contain a conductive agent, a binder, an electrolyte ( (a polymer matrix, an ion-conducting polymer, an electrolytic solution, etc.), an electrolyte supporting salt (lithium salt) for enhancing ion conductivity, and the like.
  • the conductive additive is added to improve the conductivity of each electrode (bipolar electrode 11, positive terminal electrode 12, negative terminal electrode 13).
  • the conductive aid include acetylene black, carbon black, and graphite.
  • fluorine-containing resins such as polyvinylidene fluoride, polytetrafluoroethylene, and fluororubber, thermoplastic resins such as polypropylene and polyethylene, imide resins such as polyimide and polyamideimide, alkoxysilyl group-containing resins, and acrylic acid can be used.
  • acrylic resins such as methacrylic acid, styrene-butadiene rubber (SBR), carboxymethyl cellulose, alginates such as sodium alginate and ammonium alginate, water-soluble cellulose ester crosslinked products, starch-acrylic acid graft polymers, and the like.
  • SBR styrene-butadiene rubber
  • alginates such as sodium alginate and ammonium alginate
  • water-soluble cellulose ester crosslinked products starch-acrylic acid graft polymers, and the like.
  • solvent for example, water, N-methyl-2-pyrrolidone (NMP), etc. are used.
  • the separator 14 may be, for example, a porous sheet or nonwoven fabric containing a polymer that absorbs and retains electrolyte.
  • Examples of the material for the separator 14 include polypropylene, polyethylene, polyolefin, polyester, and the like.
  • Separator 14 may have a single layer structure or a multilayer structure.
  • the multilayer structure may have, for example, a ceramic layer as an adhesive layer or a heat-resistant layer.
  • the separator 14 may be impregnated with an electrolyte.
  • the separator 14 may be made of an electrolyte such as a polymer electrolyte or an inorganic electrolyte.
  • the electrolyte impregnated into the separator 14 is, for example, a liquid electrolyte (electrolyte) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent, or a polymer gel electrolyte containing an electrolyte held in a polymer matrix. etc.
  • a liquid electrolyte electrolyte (electrolyte) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent
  • a polymer gel electrolyte containing an electrolyte held in a polymer matrix.
  • examples of the electrolyte salt include LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 and the like. Any known lithium salt may be used.
  • nonaqueous solvent known solvents such as cyclic carbonates, cyclic esters, chain carbonates, chain esters, and ethers may be used. Note that two or more of these known solvent materials may be used in combination.
  • the sealing body 20 is formed in a frame shape at the peripheral edge of the electrode stack 10 so as to surround the electrode stack 10.
  • the sealing body 20 can be joined to each of the first main surface 15a and the second main surface 15b of the current collector 15 at the peripheral edge 15c of the current collector 15.
  • the sealing body 20 is for forming an internal space S between the current collectors 15 adjacent to each other in the first direction D1, and for sealing each of the internal spaces S.
  • Each internal space S accommodates an electrolytic solution (not shown). That is, the sealing body 20 defines an internal space S that accommodates the electrolyte together with the current collector 15 adjacent in the first direction D1.
  • the sealing body 20 prevents the electrolyte from permeating to the outside.
  • the sealing body 20 suppresses the intrusion of moisture, gas, etc. from the outside of the electrode stack 10 into the internal space S, and also suppresses the electrolyte contained in the electrode stack 10 from leaking to the outside.
  • the edge of the separator 14 is joined to the sealing body 20.
  • the sealing body 20 includes an insulating material. Examples of the material of the sealing body 20 include various resin materials such as polypropylene, polyethylene, polystyrene, ABS resin, acid-modified polypropylene, acid-modified polyethylene, and acrylonitrile styrene resin.
  • the sealing body 20 includes a plurality of sealants 21 , a plurality of spacers 22 , and a welded end portion 23 .
  • the sealing material 21 is provided on each of the current collectors 15. Therefore, the sealing materials 21 are stacked on each other along the first direction D1.
  • the sealing material 21 has a frame shape and is provided on the peripheral edge 15c of the current collector 15. That is, the sealing material 21 is provided from the first main surface 15a of the current collector 15 to the second main surface 15b via the end surface, and covers the peripheral edge portion 15c.
  • the sealing material 21 may be welded to at least one of the first main surface 15a and the second main surface 15b of the current collector 15.
  • the spacer 22 is arranged to be interposed between the sealing materials 21 adjacent to each other in the first direction D1. Thereby, the spacer 22 maintains a space between the sealing materials 21 adjacent to each other in the first direction D1, that is, between the current collectors 15 adjacent to each other in the first direction D1.
  • the spacer 22 has a frame shape having an inner peripheral end surface and an outer peripheral end surface, and is arranged on the peripheral edge 15c of the current collector 15 when viewed from the first direction D1.
  • the end of the separator 14 is sandwiched and fixed between the sealing material 21 and the spacer 22.
  • An end of the separator 14 may be welded to at least one of the sealant 21 and the spacer 22.
  • the welded end portion 23 is formed by welding and integrating the ends of the plurality of sealing materials 21 and the plurality of spacers 22 on the side opposite to the internal space S. More specifically, the welded end portion 23 is formed by welding the parts of the plurality of sealing materials 21 and the plurality of spacers 22 located outside the current collector 15 when viewed from the first direction D1.
  • the welded end portion 23 has a frame shape surrounding the electrode stack 10 when viewed from the first direction D1.
  • An outer surface 23s of the welded end portion 23 on the opposite side to the inner space S extends along the first direction D1 and constitutes an outer surface of the sealing body 20.
  • the sealing body 20 has a built-up portion 25.
  • the built-up portion 25 is arranged on the outer surface in the first direction D1 of the sealing material 21 provided on the current collector 15 of the positive end electrode 12 and the negative end electrode 13.
  • the built-up portion 25 is joined to the sealing material 21.
  • the end portion of the built-up portion 25 located outside the current collector 15 when viewed from the first direction D1 is welded to the end portion of the sealing material 21 and constitutes a part of the welded end portion 23.
  • the sealing body 20 has a polygonal outer shape when viewed from the first direction D1, and includes each side of the polygon. For example, when the outer shape of the sealed body 20 when viewed from the first direction D1 is a quadrilateral, the sealed body 20 includes four sides.
  • a communication hole 27, which will be described later, is provided on one of the plurality of sides of the sealing body 20.
  • the built-up portion 25 is provided only on the side where the communication hole 27 is provided.
  • the first main surface 15a of the current collector 15 of the positive terminal electrode 12 and the second main surface 15b of the current collector 15 of the negative terminal electrode 13 exposed from the sealing body 20 are provided with an electricity storage module.
  • a conductive member 50 that functions as a terminal for extracting current from 1 is arranged and electrically connected.
  • the conductive member 50 can be used to electrically connect the plurality of power storage modules 1.
  • the conductive member 50 can also be used as a restraining member to apply a restraining load to the electrode stack 10.
  • a cooling channel may be formed in the conductive member 50.
  • the electrode stack 10 can be cooled by flowing a cooling medium through the cooling channel formed in the conductive member 50.
  • the frame member 30 is configured separately from the sealing body 20 and is joined to the sealing body 20.
  • the frame member 30 is joined (for example, welded) to the outer surface 23s of the welded end portion 23, which is the outer surface of the sealing body 20.
  • the frame member 30 extends from one built-up part 25 (the built-up part 25 on the positive terminal electrode 12 side) to the other built-up part 25 (the built-up part 25 on the negative terminal electrode 13 side) in the first direction D1. There is. Therefore, the outer edge of the frame member 30 in the first direction D1 is located on the built-up portion 25, and coincides with the outer edge of the built-up portion 25, as an example.
  • the sheet member 40 is joined (attached) to the end surface 30s of the frame member 30 on the opposite side to the sealing body 20.
  • the sheet member 40 is, for example, a laminate film. Subsequently, details of the frame member 30 will be explained.
  • FIG. 2 is a schematic cross-sectional view showing an enlarged part of the electricity storage module shown in FIG. 1.
  • FIG. 3 is a schematic side view of the electricity storage module shown in FIG. 1.
  • FIG. 4(a) is a schematic cross-sectional view taken along line IV-IV in FIG. 3.
  • 3(a) shows a state where the frame member 30 is not provided on the sealing body 20, and
  • FIG. 3(b) shows a state where the frame member 30 is provided on the sealing body 20. has been done.
  • the sealing body 20 is formed with communication holes 27 that communicate with each of the plurality of internal spaces S. As shown in FIGS.
  • the communication hole 27 is formed by cutting out a part of the spacer 22, and is formed to pass through the spacer 22 and the welded end portion 23.
  • the communication hole 27 has one opening in the internal space S and the other opening 27h in the outer surface 23s of the welded end 23.
  • a cell C including one internal space S is formed by a pair of adjacent current collectors 15.
  • one communication hole 27 is formed for one cell C.
  • the opening 27h of the communication hole 27 is arranged so that its position in the third direction D3 is different for each cell C. It is located.
  • the third direction D3 is a direction intersecting the first direction D1 and the second direction D2, and is the width direction of the power storage module 1 along the outer surface 23s.
  • the positions of the openings 27h in the third direction D3 are staggered from the cell C on one end side to the cell C on the other end side in the first direction D1. Therefore, here, a plurality of openings 27h whose positions in the third direction D3 are generally the same are provided corresponding to every other cell C, and are arranged along the first direction D1.
  • the plurality of openings 27h include a group of openings 28 arranged along the first direction D1 and a first opening 28 at a different position from the openings 28 in the third direction D3. and another group of openings 29 arranged along direction D1.
  • the frame member 30 is joined (for example, welded) to the outer surface 23s of the welded end 23.
  • the frame member 30 includes a plurality of frame portions 31 surrounding each opening 27h of the plurality of communication holes 27 when viewed from the second direction D2.
  • a plurality of frame members 30 are used.
  • the plurality of frame members 30 are arranged while being spaced apart from each other along the third direction D3.
  • each of the plurality of frame parts 31 of one frame member 30 is provided so as to surround each of one group of openings 28, and each of the plurality of frame parts 31 of another frame member 30 is provided so as to surround each of one group of openings 28. It is set up to surround each of the.
  • each of the plurality of frame members 30 is a group of openings 27h different from each other, and is arranged so that the frame portion 31 surrounds a group of openings 28 and 29 arranged in the first direction D1 when viewed from the second direction D2. has been done.
  • the frame portion 31 includes a first end surface 31a that is joined (for example, welded) to the outer surface 23s so as to surround each opening 27h of the plurality of communication holes 27 when viewed from the second direction D2, and a first end surface 31a that is joined (for example, welded) to the outer surface 23s so as to surround each opening 27h of the plurality of communication holes 27, and a first end surface 31a that is opposite to the first end surface 31a. It includes a second end surface 31b that is an end surface and is formed so as to surround each opening 27h of the plurality of communication holes 27 when viewed from the second direction D2.
  • Each frame member 30 further includes a flange 32 that protrudes from the end of the frame portion 31 on the first end surface 31a side along the outer surface 23s and is joined (for example, welded) to the outer surface 23s.
  • the frame portion 31 has a rectangular frame shape. Therefore, the region 33 surrounded by the frame portion 31 when viewed from the second direction D2 has a rectangular shape. The bottom surface of this region 33 is the outer surface 23s of the welded end portion 23 (the outer surface of the sealing body 20).
  • the flange 32 extends from a portion of the frame 31 extending along the first direction D1 toward the inside of the region 33 surrounded by the frame 31 along the third direction D3 when viewed from the second direction D2. It stands out. When viewed from the second direction D2, the flange 32 is formed in each region 33 so as to be spaced apart from the opening 27h (that is, does not reach the opening 27h).
  • the flange 32 extends from a portion of the frame 31 extending along the first direction D1 toward the outside of the region 33 surrounded by the frame 31 in the third direction D3. It may be provided so as to protrude along. Alternatively, as shown in FIG. 4C, the flange 32 may be provided so as to protrude both inside and outside the region 33 surrounded by the frame portion 31. Furthermore, as shown in FIG. 3(b), in the frame member 30, a portion extending along the third direction D3 of the frame portion 31 toward the inside of the region 33 surrounded by the frame portion 31. Another flange 34 may be provided so as to protrude from the first direction D1. In this case, the flanges 34 are also formed apart from the opening 27h in each region 33 (that is, do not reach the opening 27h) when viewed from the second direction.
  • a plurality of frames 31 partition a plurality of (three in the illustrated example) regions 33 arranged along the first direction D1, and each region is divided by a plurality of frames 31 when viewed from the second direction.
  • An opening 27h of the communication hole 27 is located within the opening 33.
  • the frame member 30 has an end surface 30s (second end surface 31b) on the opposite side to the outer surface 23s of the welded end portion 23 (that is, on the opposite side to the sealing body 20).
  • the electrolyte can be introduced into each area 33 through the opening 27h. It becomes possible to inject the electrolytic solution into the internal space S from the communication hole 27 connected to 33.
  • the sheet member 40 is joined (for example, bonded) to the end surface 30s to seal the region 33 (that is, the internal space S).
  • one sheet member 40 may be provided across the plurality of frame members 30, or one sheet member 40 may be provided for each frame member 30.
  • the plurality of frame members 30 are asymmetrical in the first direction D1 by including at least two frame parts 31 having different sizes in the first direction D1. It has a shape.
  • the size in the first direction D1 of one of the three frame parts 31 i.e., region 33
  • the other two frame parts 31 i.e., region 33).
  • a plurality of such asymmetric frame members 30 are arranged in different directions (inverted with respect to the first direction D1). Thereby, the position of the region 33 surrounded by the frame portion 31 in the first direction D1 is made different between the frame members 30 in different orientations. As a result, it is possible to surround the openings 27h of the plurality of communication holes 27 at different positions in the first direction D1 with fewer types of frame members 30.
  • the frame member 30 as described above may be formed of a resin having a melting point higher than that of the resin of the sealing body 20. Further, the resin of the sealing body 20 and the resin of the frame member 30 may be resins having the same base resin. As an example, when the sealing body 20 is made of low-density polyethylene, the frame member 30 can be made of high-density polyethylene. Note that the frame member 30 may be formed of a resin having a melting point higher than the melting point of the resin of the sealing body 20, when the sealing body 20 is composed of a plurality of resins. It may also include a case where the frame member 30 is formed of a resin having a melting point higher than that of at least one of the plurality of constituent resins.
  • the frame member 30 can be formed of high-density polyethylene.
  • FIGS. 5 and 6 are schematic cross-sectional views for explaining one step of the method for manufacturing the electricity storage module shown in FIGS. 1 to 4.
  • FIG. 5 here, the electrode stack 10, the sealing body 20, and the frame member 30 are separately prepared.
  • the sealing body 20 is provided and integrated with the electrode stack 10.
  • FIGS. 5 and 6 only a part of the electrode stack 10 and the sealing body 20 are shown.
  • the heater H1 is arranged on the outer surface of the sealing body 20 (the outer surface 23s of the welded end portion 23). Moreover, the heater H2 is arranged on the end surface 30r (first end surface 31a) side of the frame member 30 opposite to the end surface 30s.
  • the heater H1 is a heater whose temperature is lower than that of the heater H2.
  • the sealed body 20 is heated by the heater H1, and a part of the sealed body 20 is melted from the outer surface 23s side.
  • the frame member 30 is heated by the heater H2, and a part of the frame member 30 is melted from the end surface 30r side.
  • the heater H1 as an infrared heater and the heater H2 as a hot plate heater, only the vicinity of the end surface 30r of the frame member 30 is selectively melted, while the outer part of the sealing body 20 is melted. It is possible to melt from the side surface 23s to a relatively deep position.
  • the frame member 30 is sealed. 20 to form a state in which a portion of the sealing body 20 on the outer surface 23s side and a portion of the frame member 30 on the end surface 30r side are compatible with each other. Thereby, the frame member 30 is welded to the sealing body 20.
  • the nozzle 60 of the electrolyte injection device is pressed against the end surface 30s of the frame member 30, and the electrolyte is introduced into the region 33 of the frame member 30 from the injection port 61 of the nozzle 60.
  • the electrolytic solution is injected into the internal space S of each cell C from the communication hole 27 connected to each region 33 through the opening 27h of the sealing body 20.
  • the nozzle 60 is removed from the end surface 30s of the frame member 30, and the sheet member 40 is attached to the end surface 30s so as to seal the region 33. Thereby, the internal space S in which the electrolytic solution is placed is sealed, and the electricity storage module 1 is manufactured.
  • the sealing body 20 provided in the electrode stack 10 is provided with the communication hole 27 that communicates with the internal space S that accommodates the electrolyte between the current collectors 15 of the electrodes. It is being
  • the sealing body 20 includes a welded end 23 formed by welding a sealing material 21 provided on the peripheral edge 15c of the current collector 15 and an end of a spacer 22 interposed between the sealing material 21. .
  • An opening 27h of the communication hole 27 is formed in the outer surface 23s of the welded end portion 23.
  • the sealing body 20 is provided with a frame member 30 having a frame portion 31 surrounding the opening 27h of the communication hole 27 on the outer surface 23s of the welded end portion 23.
  • the frame member 30 can be used for sealing by pressing the nozzle 60 when injecting the electrolytic solution or when joining another member to the sealing body 20.
  • the frame member 30 is configured separately from the sealing body 20, and is joined to the sealing body 20 at a portion of the outer surface 23s surrounding the opening 27h of the communication hole 27. According to this, unlike the case where the frame member 30 is integrally formed with the sealing body 20 by injection molding, defects such as the communication hole 27 being blocked by the resin for injection molding are less likely to occur. Therefore, deterioration in reliability is suppressed.
  • the frame member 30 further includes a flange 32 that protrudes from the end of each of the plurality of frame parts 31 on the first end surface 31a side along the outer surface 23s and is joined to the outer surface 23s. Therefore, for example, when pressing the nozzle 60 of an electrolyte injection device against the frame member 30 or when joining another member to the frame member 30, stress applied to the end surface 30s of the frame member 30 is applied to the frame member 30. 31 and the flange 32, the stress applied to the sealing body 20 side is reduced.
  • the flange 32 protrudes from the frame 31 toward the inside of the region 33 surrounded by the frame 31 when viewed from the second direction D2. Therefore, it is possible to obtain the above-mentioned effects of having the flange 32 while maintaining the external dimensions of the frame member 30.
  • the power storage module 1 includes a plurality of frame members 30 arranged along a third direction D3 that intersects the first direction D1 and the second direction D2 and runs along the outer surface 23s.
  • Each of the plurality of frame members 30 is a group of openings 27h different from each other, and is arranged so that the frame portion 31 surrounds a group of openings 28 and 29 arranged along the first direction D1 when viewed from the second direction D2. be done.
  • the flange 32 protrudes from the frame portion 31 along the third direction D3. In this way, by using a plurality of frame members 30 and providing the flanges 32 on each of the frame members 30, it is possible to reliably reduce the stress applied to the sealing body 20 side.
  • the plurality of frame members 30 include at least two frame portions 31 having different sizes in the first direction D1, so that the frame members 30 have an asymmetric shape in the first direction D1. . Therefore, when the frame member 30 is arranged such that one of the two frame portions 31 having different sizes in the first direction D1 faces toward one side (for example, upper side) in the first direction D1 than the other, , the position of the region 33 surrounded by the frame portion 31 in the first direction D1 can be changed by arranging the frame member 30 in the opposite direction.
  • the openings 27h of the plurality of communication holes 27 at different positions in the first direction D1 can be prevented from interfering with the frame portion 31 and the openings 27h. This makes it possible to enclose the area without any problems.
  • the sealing body 20 is made of resin
  • the frame member 30 is made of a resin having a melting point higher than the melting point of the resin of the sealing body 20.
  • the resin for the frame member 30 the same resin as the resin for the sealing body 20 can be used.
  • the power storage module according to the present disclosure is not limited to the power storage module 1 described above, and can be modified as desired.
  • the method of joining the frame member 30 to the sealing body 20 may be a known method such as bonding using an adhesive. It is also possible to use That is, in the power storage module 1, it is sufficient that the frame member 30 formed separately from the sealing body 20 is joined to the sealing body 20.
  • the frame member 30 has the flange 32, but the flange 32 is not essential. Furthermore, the frame member 30 is not limited to having an asymmetrical shape with respect to the first direction D1, and may have a symmetrical shape with respect to the first direction D1. Further, the frame member 30 may include three or more frame portions 31 having different sizes in the first direction D1.
  • FIG. 7 is a schematic plan view showing a frame member according to a modification.
  • FIG. 8 is a schematic cross-sectional view of the frame member shown in FIG. 7.
  • 8(a) is a sectional view taken along line XIIIa-XIIIa in FIG. 7
  • FIG. 8(b) is a sectional view taken along line XIIIb-XIIIb in FIG.
  • the power storage module 1 can include a frame member 30A shown in FIGS. 7 and 8 instead of the frame member 30 according to the above embodiment.
  • the frame member 30A differs from the frame member 30 according to the embodiment described above in that it includes a flange 32A instead of the flange 32, and is the same in other respects.
  • the flange 32A has a larger ratio of the length along the height direction (second direction D2) of the frame 31 to the amount of protrusion (thickness) from the frame 31 than the flange 32. , the flange 32 is longer than the flange 32 in the second direction D2), and is formed in an elongated shape in the second direction D2. Such a flange 32A can also be considered as a relatively thick portion of the frame portion 31.
  • the flange 32A protrudes toward the inside of the region 33 surrounded by the frame portion 31, but the flange 32A is shown in FIGS. ) may be provided to protrude toward the outside of the region 33 surrounded by the frame 31, or may be provided to protrude toward both the inside and outside of the region 33 .
  • the heater H2 is arranged on the end surface 30r (first end surface 31a) side opposite to the end surface 30s of the frame member 30A. Subsequently, the sealed body 20 is heated by the heater H1, and a part of the sealed body 20 is melted from the outer surface 23s side. Further, the frame member 30A is heated by the heater H2, and a part of the frame member 30 is melted from the end surface 30r side.
  • the heater H1 as an infrared heater and the heater H2 as a hot plate heater, only the vicinity of the end surface 30r of the frame member 30A is selectively melted, while the outer part of the sealing body 20 is melted. It is possible to melt from the side surface 23s to a relatively deep position.
  • the frame member 30A is attached to the sealing body. 20, and push the frame member 30A into the inside of the sealing body 20 from the outer surface 23s side of the sealing body 20.
  • the entirety of the flange 32A which is a thick portion of the frame member 30A, is inserted into the welded end 23, thereby making the flange 32A and the welded end 23 compatible. Therefore, after this step, the portion of the frame portion 31 of the frame member 30A other than the flange 32A protrudes from the outer surface 23s of the sealing body 20.
  • the following effects can be achieved. That is, when using the frame member 30A, when welding the frame member 30A to the sealing body 20, the tip of the frame member 30A (at least a part of the flange 32A) is attached to the welding end 23 of the sealing body 20. Once inside, the tip of the frame member 30A and the sealing body 20 become compatible. Therefore, it is possible to reliably and airtightly weld the tip of the frame member 30A to the welding end 23.
  • the frame member 30A by providing the flange 32A as a thick portion, deformation of the tip portion of the frame member 30A when the tip portion is pushed into the welded end portion 23 is suppressed.
  • the side portion along the stacking direction (first direction D1) of the sealing material 21 and the spacer 22 is pushed in crosswise by the plurality of sealing materials 21 and spacers 22, so that a relatively large force is applied to the side portion of the frame member 30A. Therefore, it is effective to form a flange 32 as a thick wall portion in the modified portion to reinforce it.
  • the electricity storage module includes [1] "an electrode stack including a current collector and an active material layer formed on the current collector, and including a plurality of electrodes stacked along a first direction; a sealing body provided on the electrode stack so as to form an internal space between the adjacent current collectors and to seal the internal space; an electrolytic solution accommodated in the internal space; a frame member configured separately from the sealing body and joined to the sealing body, and the sealing body includes a plurality of frame-shaped frames provided at the peripheral edge of each of the plurality of current collectors.
  • a plurality of spacers that are interposed between the sealing materials adjacent in the first direction and forming the internal space between the current collectors together with the plurality of sealing materials; and the plurality of sealing materials. and a welded end portion formed by welding ends of the plurality of spacers opposite to the internal space, and a welded end portion that communicates with each of the plurality of internal spaces, and a welded end portion of the welded end portion on the opposite side to the internal space.
  • the frame member including a plurality of frame portions surrounding the openings of each of the plurality of communication holes when viewed from a second direction intersecting the outer surface;
  • Each of the plurality of frame portions has a first end surface joined to the outer surface so as to surround the opening of each of the plurality of communication holes when viewed from the second direction, and an end surface opposite to the first end surface. and a second end surface formed so as to surround the opening of each of the plurality of communication holes when viewed from the second direction.
  • the power storage module according to the present disclosure includes [2] "The frame member protrudes from an end on the first end surface side of each of the plurality of frame parts along the outer surface and is joined to the outer surface.
  • the power storage module according to [1] above may further include a flange.
  • the power storage module according to the present disclosure includes [3] "The power storage module according to [2] above, wherein the flange protrudes from the frame toward the inside of a region surrounded by the frame when viewed from the second direction. It may also be a module.
  • the power storage module according to the present disclosure includes [4] "a plurality of frame members arranged along a third direction that intersects the first direction and the second direction and is a direction along the outer surface," Each of the plurality of frame members is a group of different openings, and is arranged so that the frame portion surrounds a group of openings arranged along the first direction when viewed from the second direction,
  • the flange may be the electricity storage module according to [2] or [3] above, in which the flange protrudes from the frame along the third direction.
  • the electricity storage module according to the present disclosure is provided with the following features: [5] "The plurality of frame members have an asymmetric shape in the first direction by including at least two frame parts having different sizes in the first direction.
  • the power storage module according to [4] above may include the frame member.
  • the electricity storage module according to the present disclosure includes [6] "The sealing body is made of resin, the frame member is made of the same base resin as the resin of the sealing body, and the melting point of the resin of the sealing body is The electricity storage module according to any one of [1] to [5] above, which is made of a resin having a melting point higher than the above.
  • SYMBOLS 1 Energy storage module, 10... Electrode laminate, 11... Bipolar electrode (electrode), 12... Positive electrode terminal electrode (electrode), 13... Negative electrode terminal electrode (electrode), 15... Current collector, 16... Positive electrode active material layer ( active material layer), 17... negative electrode active material layer (active material layer), 20... sealing body, 21... sealing material, 22... spacer, 23... welding end, 23s... outer surface, 27... communicating hole, 27h... Opening, 30, 30A... Frame member, 30s... End surface, 31... Frame portion, 31a... First end surface, 31b... Second end surface, 32, 32A... Flange, 33... Region, D1... First direction, D2... Second Direction, D3...Third direction, S...Internal space.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2023/015783 2022-05-02 2023-04-20 蓄電モジュール Ceased WO2023214511A1 (ja)

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US18/860,985 US20250357635A1 (en) 2022-05-02 2023-04-20 Electric power storage module
JP2024519191A JP7740533B2 (ja) 2022-05-02 2023-04-20 蓄電モジュール
CN202380037842.1A CN119137790A (zh) 2022-05-02 2023-04-20 蓄电模块

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103531851A (zh) * 2013-10-08 2014-01-22 广东中商国通电子有限公司 圆柱型铅酸双极电池
WO2018159456A1 (ja) * 2017-02-28 2018-09-07 株式会社豊田自動織機 蓄電モジュール及び蓄電モジュールの製造方法
JP2020140881A (ja) * 2019-02-28 2020-09-03 株式会社豊田自動織機 蓄電モジュールの製造装置及び製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103531851A (zh) * 2013-10-08 2014-01-22 广东中商国通电子有限公司 圆柱型铅酸双极电池
WO2018159456A1 (ja) * 2017-02-28 2018-09-07 株式会社豊田自動織機 蓄電モジュール及び蓄電モジュールの製造方法
JP2020140881A (ja) * 2019-02-28 2020-09-03 株式会社豊田自動織機 蓄電モジュールの製造装置及び製造方法

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