WO2022264583A1 - Method for manufacturing power storage device - Google Patents

Method for manufacturing power storage device Download PDF

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Publication number
WO2022264583A1
WO2022264583A1 PCT/JP2022/012504 JP2022012504W WO2022264583A1 WO 2022264583 A1 WO2022264583 A1 WO 2022264583A1 JP 2022012504 W JP2022012504 W JP 2022012504W WO 2022264583 A1 WO2022264583 A1 WO 2022264583A1
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WO
WIPO (PCT)
Prior art keywords
sealing
communication port
laminate
active material
axis direction
Prior art date
Application number
PCT/JP2022/012504
Other languages
French (fr)
Japanese (ja)
Inventor
衣川達哉
河端栄克
山路智也
磯村亮太
福田敬志
Original Assignee
株式会社豊田自動織機
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Filing date
Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2022264583A1 publication Critical patent/WO2022264583A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • 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
    • H01M50/183—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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • 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

  • the present disclosure relates to a method for manufacturing a power storage device.
  • Patent Document 1 As a conventional method for manufacturing a power storage device, there is a manufacturing method described in Patent Document 1, for example.
  • an electrode laminate having a plurality of laminated bipolar electrodes and a sealing body arranged so as to surround the electrode laminate are prepared, and a nozzle is pressed against the outer surface of the sealing body.
  • the electrolyte By supplying the electrolyte through the communication port, the electrolyte is injected into the internal space of the electrode laminate while suppressing leakage of the electrolyte.
  • the sealing body it is desirable to form the sealing body more easily in order to improve productivity. If the encapsulant is formed simply, the surface condition of the outer surface of the encapsulant may become rough. Therefore, for example, when the nozzle is pressed against the outer surface of the sealing body to inject the electrolytic solution, it may become difficult to ensure the sealing performance between the outer surface and the nozzle.
  • An object of the present disclosure is to provide a method for manufacturing a power storage device that can improve productivity and ensure sealing performance.
  • a method for manufacturing a power storage device includes a plurality of current collectors provided with active material layers, and a frame-like frame surrounding the active material layers when viewed from the thickness direction of the current collectors.
  • the side surface including the communication port is formed by melting the plurality of sealing members. This simplifies the manufacturing process, thereby improving productivity. Moreover, in the melting step, the plurality of sealing members are melted by non-contact heating. As a result, compared to the case where a plurality of sealing members are melted by a heating member that contacts the sealing member, for example, deformation of the side surface due to stringiness of the sealing member when the heating member is separated from the sealing member. can be suppressed. Moreover, in the molding process, a molding surface is formed by pressing against the side surface a pressing member having a temperature lower than the melting point of the sealing member.
  • a molding surface including a frame portion that protrudes so as to surround the communication port may be formed.
  • the laminate further includes a protruding member arranged on the sealing member along the outer edge of the sealing member positioned at one end in the lamination direction of the laminate, and in the molding process, a region of the side surface corresponding to the protruding member You may form a molding surface on. As a result, a sufficient sealing width of the molding surface can be secured, and the sealing performance of the molding surface can be further improved.
  • the plurality of sealing members are melted while the communication port forming member is interposed in the hole corresponding to the communication port in the laminate, and in the molding step, the communication port forming member is inserted into the through hole of the pressing member.
  • a pressing member may be pressed against the side to be inserted.
  • the pressing member may be pressed against the side surface while sliding the pressing member and the communication port forming member in the through hole. Thereby, the pressing member can be guided using the communication port forming member. Therefore, the accuracy of the position of the molding surface can be improved.
  • the region provided with the active material layer viewed from the stacking direction of the laminate is constrained by the electrode constraining member, and the region provided with the sealing member viewed from the stacking direction has the thermal conductivity of the electrode constraining member.
  • a plurality of sealing members may be melted while constrained by a thermally insulating constraining member smaller than . As a result, the heat used to melt the plurality of sealing members can be suppressed from escaping while the laminate is securely restrained, and the plurality of sealing members can be efficiently melted.
  • an engaging portion that engages with the equipment-side nozzle may be formed on the side surface. As a result, it is possible to accurately position the molding surface and the facility-side nozzle.
  • FIG. 1 is a schematic cross-sectional view of a power storage device according to an embodiment.
  • FIG. 2 is a flow chart showing a method of manufacturing the power storage device shown in FIG.
  • FIG. 3 is a diagram showing the preparation process.
  • FIG. 4 is a diagram showing the melting process.
  • FIG. 5 is a diagram showing the molding process.
  • FIG. 6 is a front view of a pressing member used in the molding process.
  • FIG. 7 is a diagram showing a power storage device that has undergone a molding process.
  • FIG. 8 is a diagram showing the power storage device after the communication port forming member is extracted.
  • FIG. 9 is a side view of the power storage device after the communication port forming member is pulled out.
  • FIG. 10 is a diagram showing the injection process.
  • FIG. 11 is a front view of a facility-side nozzle used in the injection process.
  • FIG. 1 is a schematic cross-sectional view of a power storage device according to an embodiment.
  • a power storage device 1 shown in FIG. 1 is, for example, a power storage module used in batteries of various vehicles such as forklifts, hybrid vehicles, and electric vehicles.
  • the power storage device 1 is, for example, a secondary battery such as a nickel-hydrogen secondary battery or a lithium-ion secondary battery.
  • the power storage device 1 may be an electric double layer capacitor or an all-solid battery. In this embodiment, the case where the power storage device 1 is a lithium ion secondary battery is illustrated.
  • the power storage device 1 includes an electrode laminate 10, a sealing portion 20, and an electrolytic solution.
  • the electrode stack 10 has a plurality of bipolar electrodes 11 , a negative terminal electrode 12 , a positive terminal terminal electrode 13 and a plurality of separators 14 .
  • Each 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, for example, a sheet shape.
  • the current collector 15 has, for example, a rectangular shape when viewed from the Z-axis direction.
  • the positive electrode active material layer 16 is provided on one surface 15 a of the current collector 15 .
  • the positive electrode active material layer 16 has, for example, a rectangular shape when viewed from the Z-axis direction.
  • the negative electrode active material layer 17 is provided on the other surface 15 b of the current collector 15 .
  • the negative electrode active material layer 17 has, for example, a rectangular shape when viewed from the Z-axis direction.
  • the negative electrode active material layer 17 is slightly larger than the positive electrode active material layer 16 when viewed from the Z-axis direction. That is, in a plan view in the Z-axis direction, the entire forming region of the positive electrode active material layer 16 is located within the forming region of the negative electrode active material layer 17 .
  • a plurality of bipolar electrodes 11 are stacked along the Z-axis direction such that positive electrode active material layers 16 and negative electrode active material layers 17 face each other.
  • the negative terminal electrode 12 has a current collector 15 and a negative electrode active material layer 17 .
  • the negative terminal electrode 12 does not have the positive electrode active material layer 16 . That is, the active material layer is not provided on the one surface 15a of the current collector 15 of the negative terminal electrode 12 .
  • One surface 15a of the current collector 15 of the negative terminal electrode 12 is exposed.
  • the negative terminal electrode 12 is arranged on one side in the Z-axis direction with respect to the plurality of bipolar electrodes 11 .
  • the negative electrode active material layer 17 of the negative terminal electrode 12 faces the positive electrode active material layer 16 of the bipolar electrode 11 positioned at one end in the Z-axis direction.
  • the positive terminal electrode 13 has a current collector 15 and a positive electrode active material layer 16 .
  • the positive terminal electrode 13 does not have the negative electrode active material layer 17 . That is, no active material layer is provided on the other surface 15b of the current collector 15 of the positive terminal electrode 13 .
  • the other surface 15b of the current collector 15 of the positive terminal electrode 13 is exposed.
  • the positive terminal electrode 13 is arranged on the other side in the Z-axis direction with respect to the plurality of bipolar electrodes 11 .
  • the positive electrode active material layer 16 of the positive terminal electrode 13 faces the negative electrode active material layer 17 of the bipolar electrode 11 located at the other end in the Z-axis direction.
  • the separators 14 are arranged between the adjacent bipolar electrodes 11 , between the negative terminal electrode 12 and the bipolar electrode 11 , and between the positive terminal electrode 13 and the bipolar electrode 11 .
  • the separator 14 is interposed between the positive electrode active material layer 16 and the negative electrode active material layer 17 .
  • the separator 14 separates the positive electrode active material layer 16 from the negative electrode active material layer 17, thereby preventing short circuits due to contact between adjacent electrodes and allowing charge carriers such as lithium ions to pass through.
  • the current collector 15 is a chemically inactive electrical conductor for continuing current flow 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 a resin obtained by adding a conductive filler to a conductive polymer material or a non-conductive polymer material as necessary.
  • the current collector 15 may comprise 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 (for example, a metal foil), a film shape, a mesh shape, or the like.
  • metal foil include aluminum foil, copper foil, nickel foil, titanium foil, stainless steel foil, and the like.
  • Stainless steel foils include, for example, SUS304, SUS316, SUS301, etc. specified in JIS G 4305:2015. By using a stainless steel foil as the current collector 15, the mechanical strength of the current collector 15 can be ensured.
  • the current collector 15 may be an alloy foil or clad foil of the above metals. When the current collector 15 has a foil shape, the thickness of the current collector 15 may be, for example, 1 ⁇ m to 100 ⁇ m.
  • the positive electrode active material layer 16 contains a positive electrode active material capable of intercalating and deintercalating charge carriers such as lithium ions.
  • positive electrode active materials include lithium composite metal oxides having a layered rock salt structure, metal oxides having a spinel structure, and polyanionic compounds. Any positive electrode active material may be used as long as it can be used in a lithium ion secondary battery.
  • the positive electrode active material layer 16 may contain 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 contains a negative electrode active material capable of intercalating and deintercalating charge carriers such as lithium ions.
  • the negative electrode active material may be a simple substance, an alloy, or a compound.
  • Examples of negative electrode active materials 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 (non-graphitizable carbon), soft carbon (easily graphitizable carbon), and the like.
  • Examples of artificial graphite include highly oriented graphite and mesocarbon microbeads. Elements that can be alloyed with lithium include silicon (silicon), tin, and the like.
  • the negative electrode active material layer 17 contains graphite as a carbonaceous material.
  • Each of the positive electrode active material layer 16 and the negative electrode active material layer 17 contains a conductive aid, a binder, and an electrolyte (polymer matrix) for increasing electrical conductivity as necessary. , ion-conducting polymers, electrolytes, etc.), electrolyte-supporting salts (lithium salts) for enhancing ion conductivity, and the like.
  • a conductive aid is added to increase the conductivity of each electrode 11 , 12 , 13 .
  • the conductive aid is, for example, acetylene black, carbon black or graphite.
  • the components contained in the active material layer, the compounding ratio of the components, and the thickness of the active material layer are not particularly limited, and conventionally known knowledge about lithium-ion secondary batteries can be appropriately referred to.
  • the thickness of the active material layer is, for example, 2 to 150 ⁇ m.
  • the active material layer may be formed on the surface of the current collector 15 by a known method such as roll coating.
  • a heat-resistant layer may be provided on the surface (one side or both sides) of the current collector 15 or the surface of the active material layer in order to improve the thermal stability of each electrode 11 , 12 , 13 .
  • the heat-resistant layer contains, for example, inorganic particles and a binder, and may contain additives such as a thickener.
  • Binders include 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.
  • 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.
  • the solvent include water, N-methyl-2-pyrrolidone (NMP), and the like.
  • the separator 14 may be, for example, a porous sheet or non-woven fabric containing a polymer that absorbs and retains the electrolyte.
  • materials for the separator 14 include polypropylene, polyethylene, polyolefin, and polyester.
  • Separator 14 may have a single-layer structure or a multi-layer structure.
  • the multilayer structure may, for example, have ceramic layers or the like as adhesive layers or heat-resistant layers.
  • the separator 14 may be impregnated with an electrolyte.
  • the separator 14 may be composed of an electrolyte such as a polymer electrolyte or an inorganic electrolyte.
  • the electrolyte impregnated in the separator 14 is, for example, a liquid electrolyte (electrolytic solution) 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.
  • the electrolyte salt may be LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 or the like.
  • known lithium salts of may be used.
  • nonaqueous solvent known solvents such as cyclic carbonates, cyclic esters, chain carbonates, chain esters, and ethers may be used. Two or more of these known solvent materials may be used in combination.
  • the sealing portion 20 is formed in the peripheral portion of the electrode laminate 10 so as to surround the electrode laminate 10 .
  • the sealing portion 20 is joined to each of the one surface 15 a and the other surface 15 b of each current collector 15 at the periphery of each current collector 15 .
  • the sealing portion 20 may be bonded to at least one of the one surface 15 a and the other surface 15 b of each current collector 15 .
  • the sealing part 20 seals each of the accommodation spaces S between the adjacent electrodes 11 , 12 , 13 .
  • Each accommodation space S accommodates an electrolytic solution.
  • the sealing portion 20 prevents permeation of the electrolytic solution to the outside.
  • the sealing portion 20 prevents moisture or the like from entering the housing space S from the outside of the power storage device 1 .
  • the sealing portion 20 prevents, for example, gas generated at the electrodes 11 , 12 , and 13 due to charge/discharge reactions or the like from leaking to the outside of the power storage device 1 .
  • the edge of each separator 14 may be embedded in the sealing portion 20 .
  • the sealing portion 20 includes a main body portion 21 and a pair of projecting portions 22 .
  • a side surface 20 a of the sealing portion 20 includes a plurality of communication holes 20 b that communicate the inside and outside of the electrode laminate 10 .
  • each of the plurality of communication ports 20b communicates the accommodation space S with the outside.
  • each communication port 20b is formed in one side surface 20a of the four side surfaces of the sealing portion 20. As shown in FIG.
  • the communication ports 20b are arranged obliquely with respect to the Z-axis direction when viewed from the X-axis direction.
  • a frame portion 20c is formed on the side surface 20a and protrudes so as to surround each communication port 20b.
  • the frame portion 20c when viewed from the X-axis direction, the frame portion 20c includes a frame-shaped region and a plurality of linear regions extending along the Z-axis direction inside the frame-shaped region. I'm in.
  • the frame-shaped area and the linear area are integrated. That is, the frame portion 20c has a lattice shape in which the inner side of the frame-shaped area is partitioned into a plurality of lattices by linear areas when viewed from the X-axis direction.
  • Each grid surrounds the communication port 20b. In this embodiment, one lattice surrounds one communication port 20b.
  • the frame portion 20c is formed in a region corresponding to the projecting portion 22 on the side surface 20a. Specifically, of the frame-shaped region of the frame portion 20 c , portions located on both sides in the Z-axis direction are formed on the side surfaces 20 a of the projecting portion 22 .
  • a sealing material 50 is provided on the frame portion 20c.
  • the sealing material 50 is a sheet-like member containing a resin material.
  • the sealing material 50 covers the entire frame portion 20c when viewed from the X-axis direction.
  • the sealing material 50 is joined to the tip of the frame portion 20c. Thereby, the sealing material 50 seals each communication port 20b.
  • the sealing portion 20 contains an insulating material.
  • the sealing portion 20 prevents short circuits between the electrodes 11 , 12 , 13 by insulating the electrodes 11 , 12 , 13 .
  • materials for the sealing portion 20 include various resin materials such as polypropylene, polyethylene, polystyrene, ABS resin, modified polypropylene, and acrylonitrile-styrene resin.
  • the laminate 30 is prepared (preparation step, step S1).
  • the laminate 30 surrounds a plurality of current collectors 15 (electrodes 11, 12, 13) provided with active material layers and the active material layers when viewed from the thickness direction (Z-axis direction) of the current collectors 15.
  • a plurality of frame-shaped sealing members 41 and 34 are provided so that the sealing members 41 and 34 are arranged between the plurality of current collectors 15 respectively.
  • the laminate 30 includes a plurality of electrode units 31, an electrode unit 32, an electrode unit 33, a plurality of sealing members (hereinafter referred to as "spacers") 34, a pair of projecting members 35, and a plurality of separators 14 .
  • the plurality of sealing members 41 , the plurality of spacers 34 and the pair of protruding members 35 are members that form the sealing portion 20 .
  • Each electrode unit 31 has a bipolar electrode 11 and a sealing member 41 provided on the current collector 15 of the bipolar electrode 11 .
  • the electrode unit 32 has a negative terminal electrode 12 and a sealing member 41 provided on the current collector 15 of the negative terminal electrode 12 .
  • the electrode unit 33 has a positive terminal electrode 13 and a sealing member 41 provided on the current collector 15 of the positive terminal electrode 13 .
  • the sealing member 41 is joined to the one surface 15a and the other surface 15b of the current collector 15 at the periphery of the current collector 15 .
  • the sealing member 41 may be bonded to at least one of the one surface 15 a and the other surface 15 b of the current collector 15 .
  • the sealing member 41 has a frame shape surrounding the active material layer when viewed from the thickness direction of the current collector 15 . When viewed from the Z-axis direction, the outer edge of the sealing member 41 is located outside the outer edge of the current collector 15, and the inner edge of the sealing member 41 is located inside the outer edge of the current collector 15. ing.
  • the sealing member 41 includes a body portion 42 overlapping the current collector 15 and an extension portion 43 extending outward from the outer edge of the current collector 15 when viewed in the Z-axis direction.
  • the spacer 34 has a frame shape surrounding the active material layer when viewed from the thickness direction of the current collector 15 .
  • a spacer 34 is arranged between each electrode unit 31 , 32 , 33 .
  • a notch is formed in the spacer 34 . The notch extends from the outer edge of spacer 34 to the inner edge.
  • each hole defined by each notch of the plurality of spacers 34 and the sealing member 41 adjacent in the Z-axis direction extends in the Z-axis direction when viewed from the X-axis direction. are arranged diagonally to the A communication port forming member 44 is inserted into the hole of the laminate 30 . That is, the communication port forming member 44 is interposed in the hole of the laminate 30 .
  • the communication port forming member 44 has a plate shape.
  • the communication port forming member 44 extends from the outside of the laminate 30 to the housing space S. Specifically, the communication port forming member 44 extends from the outside of the outer edge of the sealing member 41 to the inner edge of the sealing member 41 .
  • the projecting member 35 has a strip shape.
  • One protruding member 35 is arranged on the side opposite to the electrode unit 31 with respect to the electrode unit 32 so as to overlap the extending portion 43 of the sealing member 41 when viewed in the Z-axis direction.
  • One protruding member 35 is arranged on the extending portion 43 of the sealing member 41 (sealing member 41 of the electrode unit 32) located at one end in the Z-axis direction.
  • One protruding member 35 extends along one side (outer edge) of the sealing member 41 located at one end in the Z-axis direction.
  • One protruding member 35 extends along the outer surface of the laminate 30 in which a plurality of holes into which the communication port forming member 44 is inserted is formed, as viewed from the Z-axis direction.
  • the other projecting member 35 is arranged on the opposite side of the electrode unit 33 from the electrode unit 31 so as to overlap the extending portion 43 of the sealing member 41 when viewed in the Z-axis direction.
  • the other protruding member 35 is arranged on the extending portion 43 of the sealing member 41 (sealing member 41 of the electrode unit 33) located at the other end in the Z-axis direction.
  • the other protruding member 35 extends along one side (outer edge) of the sealing member 41 located at the other end in the Z-axis direction.
  • the other protruding member 35 extends along the outer surface of the laminated body 30 formed with a plurality of holes into which the communication port forming member 44 is inserted, as viewed from the Z-axis direction.
  • each sealing member 41 and each spacer 34 match or substantially match each other when viewed from the Z-axis direction.
  • the inner edges of the sealing members 41 match or substantially match each other when viewed from the Z-axis direction.
  • the inner edges of the spacers 34 match or substantially match each other when viewed from the Z-axis direction.
  • the inner edge of each spacer 34 is located outside the inner edge of each sealing member 41 when viewed in the Z-axis direction.
  • the inner edges of the protruding members 35 match or substantially match each other when viewed in the Z-axis direction.
  • the inner edge of each protruding member 35 is located outside the inner edge of each spacer 34 when viewed in the Z-axis direction.
  • each protruding member 35 constitutes, together with the plurality of sealing members 41 and the plurality of spacers 34 , the outer surface of the laminate 30 in which a plurality of holes into which the communication port forming members 44 are inserted are formed.
  • the materials of the sealing member 41, the spacer 34 and the protruding member 35 are preferably the same. Thereby, the compatibility of the sealing member 41, the spacer 34 and the protruding member 35 can be ensured.
  • the separator 14 is arranged between each of the electrode units 31, 32, 33.
  • the edge of the separator 14 is arranged between one of the adjacent sealing members 41 and the spacer 34 .
  • the laminate 30 is restrained (step S2). Specifically, the regions in which the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided are constrained by a pair of electrode constraining members 51 when viewed from the Z-axis direction (the lamination direction of the laminate 30), and A pair of heat insulating restraining members 52 restrain the region where the sealing member 41 is provided when viewed from above.
  • the electrode binding member 51 has a plate-like shape that covers the region of the laminate 30 where the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided when viewed from the Z-axis direction.
  • a pair of electrode binding members 51 are arranged on both sides of the laminate 30 in the Z-axis direction.
  • a pair of electrode restraint members 51 sandwich portions of the laminate 30 inside the sealing member 41 from both sides of the laminate 30 in the Z-axis direction.
  • the material of the electrode binding member 51 is, for example, metal.
  • the heat insulating restraint member 52 has a frame shape along the sealing member 41 .
  • a pair of heat-insulating restraint members 52 are arranged on the periphery of the laminated body 30 in the Z-axis direction.
  • the thermal conductivity of the heat insulation binding member 52 is smaller than the thermal conductivity of the electrode binding member 51 .
  • the material of the heat insulating restraint member 52 is, for example, phenolic resin.
  • the pair of heat insulating restraint members 52 sandwich the portion of the laminate 30 where the sealing member 41, the spacer 34 and the protruding member 35 are provided from both sides of the laminate 30 in the Z-axis direction.
  • the outer edge of the heat insulating restraint member 52 matches the outer edge of the sealing member 41 and the outer edge of the projecting member 35 when viewed from the Z-axis direction.
  • the outer edge of the heat insulating restraint member 52 may be located outside the outer edge of the sealing member 41 and the outer edge of the projecting member 35 when viewed in the Z-axis direction.
  • the inner edge of the heat insulating restraint member 52 matches the inner edge of the sealing member 41 when viewed from the Z-axis direction.
  • the inner edge of the heat insulating restraint member 52 may be located inside the inner edge of the sealing member 41 when viewed from the Z-axis direction.
  • the heat insulating restraint member 52 has a first restraint portion 52a that contacts the sealing member 41 and a second restraint portion 52b that contacts the projecting member 35 .
  • the first restraint portion 52 a has a frame shape along the sealing member 41 .
  • the first restraint portion 52a does not overlap the protruding member 35 when viewed from the Z-axis direction.
  • the first restraint portion 52a contacts the sealing member 41 so as to avoid the protruding member 35.
  • the first restraint portion 52a is located on one side of the projecting member 35 in the X-axis direction when viewed in the Z-axis direction.
  • a portion of the first restraint portion 52a along the portion of the sealing member 41 where the protruding member 35 is provided has a shorter length in the X-axis direction than a portion along other portions of the sealing member 41 .
  • the width of the side portion near the protruding member 35 is equal to the width of the other side of the first restraining portion 52a. smaller than the width of the part.
  • the second restraining portion 52b protrudes in the X-axis direction from the first restraining portion 52a toward the protruding member 35.
  • the second restraint portion 52b extends along the Y-axis direction.
  • the second restraint portion 52b overlaps the projecting member 35 when viewed from the Z-axis direction.
  • the thickness of the second restraining portion 52b in the Z-axis direction is smaller than the thickness of the first restraining portion 52a in the Z-axis direction.
  • a step along the projecting member 35 is formed at the boundary between the first restraining portion 52a and the second restraining portion 52b.
  • the thickness in the Z-axis direction of the region in which the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided in the laminate 30 is greater than the thickness in the Z-axis direction of the region in which the sealing member 41 is provided. Since each region is separately constrained by the electrode constraining member 51 and the heat insulating constraining member 52, a sufficient constraining load is applied in the Z-axis direction to the region where the sealing member 41 is provided. As a result, the sealing members 41, the spacers 34, and the protruding members 35 are reliably brought into contact with each other in the Z-axis direction.
  • each sealing member 41, each spacer 34, and each projecting member 35 are melted by non-contact heating.
  • the laminate 30 is placed in a heating device 60 .
  • the heating device 60 is, for example, an infrared heater.
  • the heating device 60 irradiates the outer surfaces of the sealing members 41, the spacers 34, and the protruding members 35 with infrared rays.
  • each sealing member 41 , each spacer 34 and each protruding member 35 are irradiated with infrared rays, heat is generated from each sealing member 41 , each spacer 34 and each protruding member 35 .
  • Each sealing member 41, each spacer 34, and each protruding member 35 are heated and controlled so as to have a temperature equal to or higher than the melting point.
  • the sealing members 41, the spacers 34, and the protruding members 35 which are in contact with each other, are melted by being constrained in the Z-axis direction, and are welded to each other to be integrated.
  • a stop 40 is formed. Since each sealing member 41, each spacer 34, and each protruding member 35 are melted with the communication port forming member 44 interposed in each notch, each notch is prevented from being filled with the melted resin.
  • the sealing body 40 has a rectangular tubular shape surrounding the electrode laminate 10 .
  • the sealing body 40 includes a body portion 45 and a projecting portion 46 .
  • the body portion 45 is a portion formed by integrating each sealing member 41 and each spacer 34 .
  • the projecting portion 46 is a portion formed by integrating the projecting member 35 with the sealing member 41 .
  • the body portion 45 seals the accommodation space S between the adjacent electrodes 11 , 12 , 13 .
  • the sealing body 40 includes side surfaces formed by melting the sealing members 41, the spacers 34, and the protruding members 35. As shown in FIG.
  • the side surface extends along the Z-axis direction. The side faces intersect in the X-axis direction.
  • the side surface includes a plurality of communication ports 40b corresponding to each notch.
  • the communication port 40b communicates the inside and the outside of the electrode laminate 10 (laminate 30). Specifically, each of the plurality of communication ports 40b communicates the accommodation space S with the outside.
  • each communication port 40b is formed in one side 40a of the four side surfaces of the sealing body 40. As shown in FIG.
  • a molding surface 40c (see FIG. 7) is formed in the area surrounding each communication port 40b of the side surface 40a (molding step, step S4).
  • the molding surface 40c is a surface against which an equipment-side nozzle 80 (see FIG. 10), which will be described later, is pressed.
  • a molding surface 40c is formed in a region corresponding to the main body portion 45 and the projecting portion 46 in the side surface 40a. In this embodiment, the molding surface 40c is formed on the entire side surface 40a including the plurality of communication ports 40b.
  • the molding surface 40c is formed by pressing the pressing member 70 against the side surface 40a.
  • the pressing member 70 has a plate shape.
  • the material of the pressing member 70 is metal.
  • the pressing surface 70a of the pressing member 70 is formed with a plurality of through holes 70b, a first recess 70c, and a pair of second recesses 70d.
  • Each through hole 70b is formed to correspond to each communication port 40b. That is, the plurality of through holes 70b are arranged obliquely with respect to the Z-axis direction when viewed from the X-axis direction.
  • the through hole 70b is slightly larger than the communication port forming member 44.
  • the communication port forming member 44 can be inserted into the through hole 70b while sliding with the pressing member 70.
  • the first concave portion 70c surrounds each through hole 70b.
  • the first recess 70c when viewed from the X-axis direction, includes a frame-shaped region and a plurality of linear regions extending along the Z-axis direction inside the frame-shaped region. contains. The frame-shaped area and the linear area are connected to each other.
  • the first concave portion 70c has a grid shape in which the inner side of the frame-shaped region is partitioned into a plurality of grids by linear regions when viewed from the X-axis direction. Each grid surrounds a through-hole 70b.
  • one lattice surrounds one through-hole 70b.
  • the pair of second recesses 70d are positioned on both sides in the Y-axis direction with respect to the first recesses 70c.
  • the second recess 70d has a conical shape.
  • step S4 the pressing member 70 is pressed against the side surface 40a such that the pressing surface 70a of the pressing member 70 faces the side surface 40a and the communication hole forming member 44 is inserted into each through hole 70b of the pressing member 70. .
  • step S4 the pressing member 70 is pressed against the side surface 40a while sliding the pressing member 70 and the communication port forming member 44 in each through hole 70b. Thereby, the pressing member 70 is guided by the communication port forming member 44 .
  • step S4 the pressing member 70 is pressed against the side surface 40a of the sealing body 40 in the molten state. That is, in step S4, the pressing member 70 is pressed against the side surface 40a of the sealing body 40 which has not yet completely solidified.
  • step S4 the pressing member 70 having a temperature lower than the melting point of the sealing body 40 is pressed against the side surface 40a.
  • the pressing member 70 may be at room temperature without being heated by a heater or the like. The temperature of the pressing member 70 is lower than the temperature of the sealing body 40 when the pressing member 70 is pressed against the side surface 40a. As a result, the sealing body 40 is cooled by the pressing member 70 and solidified more quickly, thereby improving productivity.
  • the communication port forming member 44 is pulled out from each notch (step S5).
  • a plurality of communication ports 40b are formed that communicate the accommodation space S with the outside.
  • the frame portion 40d protrudes so as to surround each communication port 40b.
  • the frame portion 40d has a shape corresponding to the first concave portion 70 c of the pressing member 70 .
  • the frame portion 40d includes a frame-shaped region and a plurality of linear regions extending along the Z-axis direction inside the frame-shaped region when viewed from the X-axis direction. The frame-shaped area and the linear area are integrated.
  • the frame portion 40d has a grid shape in which the inner side of the frame-shaped region is partitioned into a plurality of grids by linear regions when viewed from the X-axis direction.
  • Each grid surrounds the communication port 40b.
  • one lattice surrounds one communication port 40b.
  • the frame portion 40d is formed in a region of the side surface 40a corresponding to the projecting portion 46. Specifically, of the frame-shaped region of the frame portion 40 d , portions located on both sides in the Z-axis direction are formed on the side surfaces 40 a of the projecting portion 46 . A pair of engaging portions 40e are formed on both sides of the frame portion 40d in the Y-axis direction.
  • the engaging portion 40 e has a shape corresponding to the second recess 70 d of the pressing member 70 .
  • the engaging portion 40e protrudes from the molding surface 40c.
  • the engaging portion 40e has a conical shape.
  • the engaging portion 40 e is a portion that engages with the equipment-side nozzle 80 .
  • each housing space S is pressed against each communication port 40b (step S6).
  • the facility-side nozzle 80 is pressed against the molding surface 40c.
  • the facility-side nozzle 80 has a sealing surface 80a.
  • a plurality of injection ports 80b and a pair of engaging portions 80c are formed in the sealing surface 80a.
  • Each injection port 80b corresponds to each communication port 40b. Specifically, one injection port 80b corresponds to one grid of the frame portion 40d.
  • the engaging portion 80c is a recess formed in the sealing surface 80a.
  • the engaging portion 80c has a shape corresponding to the engaging portion 40e.
  • the engaging portion 80c has a conical shape.
  • the sealing surface 80a is made of an elastic material.
  • the sealing surface 80a is, for example, the surface of a packing.
  • step S6 the sealing surface 80a is pressed against the molding surface 40c including the frame portion 40d.
  • the sealing surface 80a is pressed against the molding surface 40c, at least a portion of the frame portion 40d bites into the sealing surface 80a.
  • the sealing performance between the molding surface 40c and the facility-side nozzle 80 is, for example, the other side surface of the sealing body 40 (the side surface on which the molding surface 40c is not formed). It is superior to the sealing property between the other side surface and the equipment-side nozzle 80 when the equipment-side nozzle 80 is pressed against the other side.
  • the molding surface 40c since the molding surface 40c includes the frame portion 40d, when the sealing surface 80a of the facility-side nozzle 80 is pressed against the frame portion 40d, the surface pressure received by the sealing surface 80a of the facility-side nozzle 80 is large. Become. Thereby, the sealing property between the molding surface 40c and the facility-side nozzle 80 is improved.
  • each communication port 40b is sealed. Specifically, by joining a sealing material to the frame portion 40d, the communication port 40b surrounded by the frame portion 40d is sealed.
  • power storage device 1 shown in FIG. 1 is manufactured.
  • the body portion 45 corresponds to the body portion 21 (see FIG. 1).
  • the projecting portion 46 corresponds to the projecting portion 22 (see FIG. 1).
  • the molding surface 40c corresponds to the side surface 20a (see FIG. 1).
  • the communication port 40b corresponds to the communication port 20b (see FIG. 1).
  • the side surface 40a of the sealing body 40 is formed by melting the sealing members 41, the spacers 34, and the protruding members 35 in step S2. .
  • each sealing member 41, each spacer 34, and each protruding member 35 are melted by non-contact heating.
  • each sealing member 41, each spacer 34, and each protruding member 35 is melted by a heating member or the like that contacts each sealing member 41, each spacer 34, and each protruding member 35, for example.
  • step S4 the pressing member 70 having a temperature lower than the melting point of each sealing member 41, each spacer 34 and each protruding member 35 is pressed against the side surface 40a to form the molding surface 40c.
  • the pressing member 70 pressed when molding the side surface 40 a has a temperature lower than the melting point of each sealing member 41 , each spacer 34 and each projecting member 35 . Therefore, the time for heating the pressing member 70 each time before pressing the pressing member 70 against the side surface 40a, or the time for suppressing the deformation of the side surface 40a when the pressing member 70 is separated from the side surface 40a. cooling time can be shortened, and productivity can be improved. Therefore, according to the method for manufacturing the power storage device 1, it is possible to improve productivity and ensure sealing performance.
  • step S4 a molding surface 40c including a frame portion 40d that protrudes so as to surround the communication port 40b is formed. Accordingly, by pressing the equipment-side nozzle 80 against the frame portion 40d, the surface pressure received by the equipment-side nozzle 80 can be improved, and the sealing performance between the molding surface 40c and the equipment-side nozzle 80 can be improved.
  • the sealing member 41 includes a body portion 42 overlapping the current collector 15 and an extension portion 43 extending from the current collector 15 when viewed from the Z-axis direction. This can suppress interference between the pressing member 70 and the current collector 15 when pressing the pressing member 70 against the side surface 40a.
  • the laminate 30 includes protruding members 35 arranged on the sealing members 41 along the outer edges of the sealing members 41 positioned at both ends of the laminate 30 in the stacking direction.
  • a molding surface 40c is formed in a region corresponding to the projecting member 35 in the side surface 40a.
  • the housing space S located at both ends in the Z-axis direction (the housing space S between the negative terminal electrode 12 and the bipolar electrode 11, or the housing space S between the positive terminal electrode 13 and the bipolar electrode 11 ) can be sufficiently ensured for the sealing width of the molding surface 40c, and the sealing performance between the molding surface 40c and the facility-side nozzle 80 can be further improved.
  • step S3 each sealing member 41, each spacer 34, and each projecting member 35 are melted while the communication port forming member 44 is interposed in the hole corresponding to the communication port 40b in the laminate 30.
  • step S ⁇ b>4 the pressing member 70 is pressed against the side surface 40 a so that the communication port forming member 44 is inserted into the through hole 70 b of the pressing member 70 .
  • the molding surface 40c can be formed by pressing the pressing member 70 against the side surface 40a.
  • step S4 the pressing member 70 is pressed against the side surface 40a while sliding the pressing member 70 and the communication port forming member 44 in the through hole 70b. As a result, the pressing member 70 can be guided using the communication port forming member 44 . Therefore, the accuracy of the position of the molding surface 40c can be improved.
  • step S3 the region where the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided is constrained by the electrode constraining member 51 when viewed from the Z-axis direction, and the sealing member 41 is provided when viewed from the Z-axis direction.
  • Each sealing member 41, each spacer 34, and each protruding member 35 are melted in a state where the region is constrained by a heat insulating constraining member 52 having a thermal conductivity lower than that of the electrode constraining member.
  • the thickness in the Z-axis direction of the region of the laminate 30 where the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided, and the Z-axis direction of the region of the laminate 30 where the sealing member 41 is provided , the sealing members 41, the spacers 34, and the projecting members 35 can be reliably restrained and brought into contact with each other. Therefore, when each sealing member 41, each spacer 34 and each projecting member 35 are melted, they are easily welded to each other. In addition, the heat applied to each sealing member 41, each spacer 34, and each protruding member 35 can be suppressed from escaping to the heat insulation restraining member 52 that restrains them. It is possible to prevent the spacer 34 and each projecting member 35 from being difficult to melt.
  • step S4 an engaging portion 40e that engages with the equipment-side nozzle 80 is formed on the side surface 40a. Thereby, positioning between the molding surface 40c and the facility-side nozzle 80 can be performed with high accuracy.
  • the present disclosure is not limited to the above embodiments.
  • the protruding member 35 may be integrally formed of the same material as the extending portion 43 .
  • the laminate 30 prepared in step S1 may not include the pair of protruding members 35 . That is, in step S3, the pair of projections 46 may not be formed.
  • the side surface 40a is expanded by pressing the pressing member 70 against the side surface 40a so that a portion of the sealing body 40 protrudes from both ends of the body portion 45 in the Z-axis direction. good.
  • step S4 the pressing member 70 may be pressed against the side surface 40a to form the molding surface 40c that protrudes from both ends of the body portion 45 in the Z-axis direction.
  • the frame portion 40d may be formed in a region corresponding to the body portion 45 in the side surface 40a.
  • step S4 an example is shown in which the molding surface 40c is formed on the entire side surface 40a including the plurality of communication holes 40b, but the molding surface 40c may be formed only on the area surrounding the communication holes 40b of the side surface 40a.
  • the pressing member 70 may be pressed only against a frame-shaped region surrounding the communication port 40b of the side surface 40a to form the frame-shaped molding surface 40c surrounding the communication port 40b.
  • the molding surface 40c may be one region surrounding the plurality of communication ports 40b, or may be a plurality of regions surrounding each communication port 40b.
  • the molding surface 40c does not have to include the frame portion 40d.
  • the molding surface 40c having better sealing properties than the other side surfaces of the sealing body 40 may be formed.
  • the molding surface 40c may be, for example, a flat surface. In this case, the flatness of the molding surface 40 c (the amount of deviation from the geometrically correct plane of the planar shape defined by JISB0621:1984) is smaller than the flatness of the other side surfaces of the sealing body 40 .
  • a projecting portion may be formed on the sealing surface 80a of the facility-side nozzle 80 in step S6.
  • the laminate 30 prepared in step S1 may not have the spacers 34.
  • the communication port forming member 44 may be arranged between the adjacent sealing members 41 .
  • the communication port forming member 44 may be arranged in a notch formed in the sealing member 41 .
  • step S6 not only the injection of the electrolytic solution, but also the airtightness inspection of the accommodation space S or the evacuation of the accommodation space S may be performed, for example, via the equipment-side nozzle. Even in these cases, the sealing performance between the molding surface 40c and the facility-side nozzle can be ensured.
  • the heating device 60 used in step S3 is an infrared heater
  • the heating device 60 may be, for example, a high frequency induction heater or a high temperature bath.

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  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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Abstract

A method for manufacturing a power storage device (1) comprises: a preparing step for preparing a stack (30) comprising a plurality of current collectors (15) having active material layers (16, 17) and a plurality of sealing members (41) having a frame shape, the sealing members (41) being arranged between the plurality of current collectors (15); a melting step for melting the plurality of sealing members (41) to form a side surface (40a) composed of the plurality of sealing members (41) and including a communication opening (40b); and a molding step for forming a molded surface (40c) onto which an equipment-side nozzle (80) is pressed in a region of the side surface (40a), formed by the melting of the plurality of sealing members (41), that surrounds the communication opening (40b). In the melting step, the plurality of sealing members (41) are melted by contactless heating. In the molding step, the molded surface (40c) is formed by pressing a pressing member (70) having a temperature lower than the melting point of the sealing members (41) onto the side surface (40a).

Description

蓄電装置の製造方法Method for manufacturing power storage device
　本開示は、蓄電装置の製造方法に関する。 The present disclosure relates to a method for manufacturing a power storage device.
　従来の蓄電装置の製造方法として、例えば特許文献１に記載の製造方法がある。この従来の製造方法では、積層された複数のバイポーラ電極を有する電極積層体と、電極積層体を取り囲むように配置された封止体とを準備し、封止体の外側面にノズルを押付けながら連通口を介して電解液を供給することで、電解液の漏れを抑制しながら電極積層体の内部空間に注液を行っている。 As a conventional method for manufacturing a power storage device, there is a manufacturing method described in Patent Document 1, for example. In this conventional manufacturing method, an electrode laminate having a plurality of laminated bipolar electrodes and a sealing body arranged so as to surround the electrode laminate are prepared, and a nozzle is pressed against the outer surface of the sealing body. By supplying the electrolyte through the communication port, the electrolyte is injected into the internal space of the electrode laminate while suppressing leakage of the electrolyte.
特開２０２０－３５６６５号公報JP 2020-35665 A
　上述したような製造方法では、生産性を改善するために、封止体をより簡易に形成することが望まれる。封止体を簡易に形成すると、封止体の外側面の表面状態が粗悪になる場合がある。したがって、例えばノズルを封止体の外側面に押付けて電解液を注液するような場合、外側面とノズルとのシール性の確保が難しくなるおそれがある。 In the manufacturing method described above, it is desirable to form the sealing body more easily in order to improve productivity. If the encapsulant is formed simply, the surface condition of the outer surface of the encapsulant may become rough. Therefore, for example, when the nozzle is pressed against the outer surface of the sealing body to inject the electrolytic solution, it may become difficult to ensure the sealing performance between the outer surface and the nozzle.
　本開示は、生産性の向上及びシール性の確保を実現できる蓄電装置の製造方法を提供することを目的とする。 An object of the present disclosure is to provide a method for manufacturing a power storage device that can improve productivity and ensure sealing performance.
　本開示の蓄電装置の製造方法は、活物質層が設けられた複数の集電体と、集電体の厚さ方向から見て活物質層を囲う枠状を呈し集電体の外縁から外側へ延出する延出部分を有する複数の封止部材とを、複数の集電体のそれぞれの間に封止部材が配置されるように備えた積層体を準備する準備工程と、複数の封止部材を溶融させることで、複数の封止部材で構成され、かつ積層体の内外を連通する連通口を含む側面を形成する溶融工程と、複数の封止部材が溶融することで形成されている側面のうち連通口を取り囲む領域に、設備側ノズルが押当てられる成型面を形成する成型工程と、を備え、溶融工程では、非接触加熱によって複数の封止部材を溶融させ、成型工程では、封止部材が溶融している状態で、封止部材の融点よりも低い温度を有する押付部材を側面に押付けることで、成型面を形成する。 A method for manufacturing a power storage device according to the present disclosure includes a plurality of current collectors provided with active material layers, and a frame-like frame surrounding the active material layers when viewed from the thickness direction of the current collectors. a preparation step of preparing a laminate including a plurality of sealing members having extension portions extending to a plurality of current collectors such that the sealing members are disposed between each of the plurality of current collectors; By melting the stopper member, a side surface including a communication port that is composed of a plurality of sealing members and communicates between the inside and outside of the laminate is formed, and the plurality of sealing members are melted. a molding step of forming a molding surface against which the equipment-side nozzle is pressed in a region surrounding the communication port of the side surface where the A molding surface is formed by pressing a pressing member having a temperature lower than the melting point of the sealing member against the side surface while the sealing member is molten.
　この蓄電装置の製造方法では、複数の封止部材を溶融させることで、連通口を含む側面を形成している。これにより、製造工程が簡易化されるため、生産性が向上する。また、溶融工程では、非接触加熱によって複数の封止部材を溶融させている。これにより、例えば封止部材に接触する加熱部材等によって複数の封止部材を溶融させる場合に比べ、封止部材から当該加熱部材を引き離す際の封止部材の糸引き等に起因する側面の変形を抑制できる。しかも、成型工程では、封止部材の融点よりも低い温度を有する押付部材を側面に押付けることで、成型面を形成している。これにより、例えば封止部材の融点以上の温度を有する押付部材を側面に押付ける場合に比べ、封止部材から押付部材を引き離す際の封止部材の糸引き等に起因する成型面の変形を抑制できる。このように、溶融工程及び成型工程では、変形が抑制された側面を形成したうえ、更に、変形が抑制された成型面を形成している。これにより、シール性が確保された所望の状態の成型面を形成しやすくなる。したがって、成型面のシール性を確保できる。よって、この蓄電装置の製造方法によれば、生産性の向上及びシール性の確保を実現できる。 In this electricity storage device manufacturing method, the side surface including the communication port is formed by melting the plurality of sealing members. This simplifies the manufacturing process, thereby improving productivity. Moreover, in the melting step, the plurality of sealing members are melted by non-contact heating. As a result, compared to the case where a plurality of sealing members are melted by a heating member that contacts the sealing member, for example, deformation of the side surface due to stringiness of the sealing member when the heating member is separated from the sealing member. can be suppressed. Moreover, in the molding process, a molding surface is formed by pressing against the side surface a pressing member having a temperature lower than the melting point of the sealing member. As a result, deformation of the molding surface due to stringiness of the sealing member when the pressing member is pulled away from the sealing member can be reduced, compared to the case where the pressing member having a temperature higher than the melting point of the sealing member is pressed against the side surface. can be suppressed. In this way, in the melting process and the molding process, the side surfaces with suppressed deformation are formed, and the molded surfaces with further suppressed deformation are formed. This makes it easier to form a molding surface in a desired state in which sealing properties are ensured. Therefore, the sealing performance of the molding surface can be ensured. Therefore, according to this power storage device manufacturing method, it is possible to improve productivity and ensure sealing performance.
　成型工程では、連通口を取り囲むように突出する枠部を含む成型面を形成してもよい。これにより、枠部に設備側ノズルを押当てることで、設備側ノズルが受ける面圧を向上でき、成型面のシール性を向上できる。 In the molding process, a molding surface including a frame portion that protrudes so as to surround the communication port may be formed. As a result, by pressing the equipment-side nozzle against the frame, the surface pressure received by the equipment-side nozzle can be improved, and the sealing performance of the molding surface can be improved.
　積層体は、積層体の積層方向の一端に位置する封止部材の外縁に沿うように封止部材上に配置される突出部材を更に備え、成型工程では、側面のうち突出部材に対応する領域に成型面を形成してもよい。これにより、成型面のシール幅を十分に確保でき、成型面のシール性を更に向上できる。 The laminate further includes a protruding member arranged on the sealing member along the outer edge of the sealing member positioned at one end in the lamination direction of the laminate, and in the molding process, a region of the side surface corresponding to the protruding member You may form a molding surface on. As a result, a sufficient sealing width of the molding surface can be secured, and the sealing performance of the molding surface can be further improved.
　溶融工程では、積層体のうち連通口に対応する孔部に連通口形成部材が介在した状態で、複数の封止部材を溶融させ、成型工程では、押付部材の貫通孔に連通口形成部材が挿入されるように、押付部材を側面に押付けてもよい。これにより、孔部に連通口形成部材が介在する状態においても、押付部材を側面に押付けることで成型面を形成できる。 In the melting step, the plurality of sealing members are melted while the communication port forming member is interposed in the hole corresponding to the communication port in the laminate, and in the molding step, the communication port forming member is inserted into the through hole of the pressing member. A pressing member may be pressed against the side to be inserted. As a result, even in a state where the communication port forming member is interposed in the hole, the molding surface can be formed by pressing the pressing member against the side surface.
　成型工程では、押付部材と連通口形成部材とを貫通孔において摺動させながら、押付部材を側面に押付けてもよい。これにより、連通口形成部材を用いて押付部材をガイドできる。したがって、成型面の位置の精度を向上できる。 In the molding process, the pressing member may be pressed against the side surface while sliding the pressing member and the communication port forming member in the through hole. Thereby, the pressing member can be guided using the communication port forming member. Therefore, the accuracy of the position of the molding surface can be improved.
　溶融工程では、積層体の積層方向から見て活物質層が設けられた領域を電極拘束部材によって拘束すると共に、積層方向から見て封止部材が設けられた領域を熱伝導率が電極拘束部材よりも小さい断熱拘束部材によって拘束した状態で、複数の封止部材を溶融させてもよい。これにより、積層体を確実に拘束しつつ、複数の封止部材の溶融に用いられる熱の逃げを抑制でき、複数の封止部材を効率良く溶融できる。 In the melting step, the region provided with the active material layer viewed from the stacking direction of the laminate is constrained by the electrode constraining member, and the region provided with the sealing member viewed from the stacking direction has the thermal conductivity of the electrode constraining member. A plurality of sealing members may be melted while constrained by a thermally insulating constraining member smaller than . As a result, the heat used to melt the plurality of sealing members can be suppressed from escaping while the laminate is securely restrained, and the plurality of sealing members can be efficiently melted.
　成型工程では、設備側ノズルと係合する係合部を側面に形成してもよい。これにより、成型面と設備側ノズルとの位置決めを精度良く行うことができる。 In the molding process, an engaging portion that engages with the equipment-side nozzle may be formed on the side surface. As a result, it is possible to accurately position the molding surface and the facility-side nozzle.
　本開示によれば、生産性の向上及びシール性の確保を実現できる蓄電装置の製造方法を提供することが可能となる。 According to the present disclosure, it is possible to provide a method for manufacturing a power storage device that can improve productivity and ensure sealing performance.
図１は、実施形態に係る蓄電装置の概略的な断面図である。FIG. 1 is a schematic cross-sectional view of a power storage device according to an embodiment. 図２は、図１に示される蓄電装置の製造方法を示すフローチャートである。FIG. 2 is a flow chart showing a method of manufacturing the power storage device shown in FIG. 図３は、準備工程を示す図である。FIG. 3 is a diagram showing the preparation process. 図４は、溶融工程を示す図である。FIG. 4 is a diagram showing the melting process. 図５は、成型工程を示す図である。FIG. 5 is a diagram showing the molding process. 図６は、成型工程で用いられる押付部材の正面図である。FIG. 6 is a front view of a pressing member used in the molding process. 図７は、成型工程を経た蓄電装置を示す図である。FIG. 7 is a diagram showing a power storage device that has undergone a molding process. 図８は、連通口形成部材が抜出された後の蓄電装置を示す図である。FIG. 8 is a diagram showing the power storage device after the communication port forming member is extracted. 図９は、連通口形成部材が抜出された後の蓄電装置の側面を示す図である。FIG. 9 is a side view of the power storage device after the communication port forming member is pulled out. 図１０は、注液工程を示す図である。FIG. 10 is a diagram showing the injection process. 図１１は、注液工程で用いられる設備側ノズルの正面図である。FIG. 11 is a front view of a facility-side nozzle used in the injection process.
　以下、添付図面を参照しながら本開示の実施形態が詳細に説明される。図面の説明において、同一又は同等の要素には同一符号が用いられ、重複する説明は省略される。 Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and overlapping descriptions are omitted.
　図１は、実施形態に係る蓄電装置の概略的な断面図である。図１に示される蓄電装置１は、例えば、フォークリフト、ハイブリッド自動車、電気自動車等の各種車両のバッテリに用いられる蓄電モジュールである。蓄電装置１は、例えばニッケル水素二次電池又はリチウムイオン二次電池等の二次電池である。蓄電装置１は、電気二重層キャパシタであってもよいし、全固体電池であってもよい。本実施形態では、蓄電装置１がリチウムイオン二次電池である場合を例示する。 FIG. 1 is a schematic cross-sectional view of a power storage device according to an embodiment. A power storage device 1 shown in FIG. 1 is, for example, a power storage module used in batteries of various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 is, for example, a secondary battery such as a nickel-hydrogen secondary battery or a lithium-ion secondary battery. The power storage device 1 may be an electric double layer capacitor or an all-solid battery. In this embodiment, the case where the power storage device 1 is a lithium ion secondary battery is illustrated.
　蓄電装置１は、電極積層体１０と、封止部２０と、電解液と、を備えている。電極積層体１０は、複数のバイポーラ電極１１と、負極終端電極１２と、正極終端電極１３と、複数のセパレータ１４と、を有している。 The power storage device 1 includes an electrode laminate 10, a sealing portion 20, and an electrolytic solution. The electrode stack 10 has a plurality of bipolar electrodes 11 , a negative terminal electrode 12 , a positive terminal terminal electrode 13 and a plurality of separators 14 .
　各バイポーラ電極１１は、集電体１５と、正極活物質層１６と、負極活物質層１７と、を有している。集電体１５は、例えばシート状を呈している。集電体１５は、Ｚ軸方向から見て例えば矩形状を呈している。正極活物質層１６は、集電体１５の一方面１５ａに設けられている。正極活物質層１６は、Ｚ軸方向から見て例えば矩形状を呈している。負極活物質層１７は、集電体１５の他方面１５ｂに設けられている。負極活物質層１７は、Ｚ軸方向から見て例えば矩形状を呈している。 Each 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, for example, a sheet shape. The current collector 15 has, for example, a rectangular shape when viewed from the Z-axis direction. The positive electrode active material layer 16 is provided on one surface 15 a of the current collector 15 . The positive electrode active material layer 16 has, for example, a rectangular shape when viewed from the Z-axis direction. The negative electrode active material layer 17 is provided on the other surface 15 b of the current collector 15 . The negative electrode active material layer 17 has, for example, a rectangular shape when viewed from the Z-axis direction.
　負極活物質層１７は、Ｚ軸方向から見て正極活物質層１６よりも一回り大きい。つまり、Ｚ軸方向から見た平面視において、正極活物質層１６の形成領域の全体が負極活物質層１７の形成領域内に位置している。複数のバイポーラ電極１１は、正極活物質層１６と負極活物質層１７とが互いに対向するようにＺ軸方向に沿って積層されている。 The negative electrode active material layer 17 is slightly larger than the positive electrode active material layer 16 when viewed from the Z-axis direction. That is, in a plan view in the Z-axis direction, the entire forming region of the positive electrode active material layer 16 is located within the forming region of the negative electrode active material layer 17 . A plurality of bipolar electrodes 11 are stacked along the Z-axis direction such that positive electrode active material layers 16 and negative electrode active material layers 17 face each other.
　負極終端電極１２は、集電体１５と、負極活物質層１７と、を有している。負極終端電極１２は、正極活物質層１６を有していない。つまり、負極終端電極１２の集電体１５の一方面１５ａには、活物質層が設けられていない。負極終端電極１２の集電体１５の一方面１５ａは、露出している。負極終端電極１２は、複数のバイポーラ電極１１に対して、Ｚ軸方向における一方側に配置されている。負極終端電極１２の負極活物質層１７は、Ｚ軸方向における一端に位置するバイポーラ電極１１の正極活物質層１６に対向している。 The negative terminal electrode 12 has a current collector 15 and a negative electrode active material layer 17 . The negative terminal electrode 12 does not have the positive electrode active material layer 16 . That is, the active material layer is not provided on the one surface 15a of the current collector 15 of the negative terminal electrode 12 . One surface 15a of the current collector 15 of the negative terminal electrode 12 is exposed. The negative terminal electrode 12 is arranged on one side in the Z-axis direction with respect to the plurality of bipolar electrodes 11 . The negative electrode active material layer 17 of the negative terminal electrode 12 faces the positive electrode active material layer 16 of the bipolar electrode 11 positioned at one end in the Z-axis direction.
　正極終端電極１３は、集電体１５と、正極活物質層１６と、を有している。正極終端電極１３は、負極活物質層１７を有していない。つまり、正極終端電極１３の集電体１５の他方面１５ｂには、活物質層が設けられていない。正極終端電極１３の集電体１５の他方面１５ｂは、露出している。正極終端電極１３は、複数のバイポーラ電極１１に対して、Ｚ軸方向における他方側に配置されている。正極終端電極１３の正極活物質層１６は、Ｚ軸方向における他端に位置するバイポーラ電極１１の負極活物質層１７に対向している。 The positive terminal electrode 13 has a current collector 15 and a positive electrode active material layer 16 . The positive terminal electrode 13 does not have the negative electrode active material layer 17 . That is, no active material layer is provided on the other surface 15b of the current collector 15 of the positive terminal electrode 13 . The other surface 15b of the current collector 15 of the positive terminal electrode 13 is exposed. The positive terminal electrode 13 is arranged on the other side in the Z-axis direction with respect to the plurality of bipolar electrodes 11 . The positive electrode active material layer 16 of the positive terminal electrode 13 faces the negative electrode active material layer 17 of the bipolar electrode 11 located at the other end in the Z-axis direction.
　セパレータ１４は、隣り合うバイポーラ電極１１の間、負極終端電極１２とバイポーラ電極１１の間、及び、正極終端電極１３とバイポーラ電極１１との間に配置されている。セパレータ１４は、正極活物質層１６と負極活物質層１７との間に介在している。セパレータ１４は、正極活物質層１６と負極活物質層１７とを隔離することで、隣り合う電極の接触による短絡を防止しつつ、リチウムイオン等の電荷担体を通過させる。 The separators 14 are arranged between the adjacent bipolar electrodes 11 , between the negative terminal electrode 12 and the bipolar electrode 11 , and between the positive terminal electrode 13 and the bipolar electrode 11 . The separator 14 is interposed between the positive electrode active material layer 16 and the negative electrode active material layer 17 . The separator 14 separates the positive electrode active material layer 16 from the negative electrode active material layer 17, thereby preventing short circuits due to contact between adjacent electrodes and allowing charge carriers such as lithium ions to pass through.
　集電体１５は、リチウムイオン二次電池の放電又は充電の間、正極活物質層１６及び負極活物質層１７に電流を流し続けるための化学的に不活性な電気伝導体である。集電体１５の材料は、例えば、金属材料、導電性樹脂材料又は導電性無機材料等である。導電性樹脂材料としては、例えば、導電性高分子材料又は非導電性高分子材料に必要に応じて導電性フィラーが添加された樹脂等が挙げられる。集電体１５は、複数の層を備えていてもよい。この場合、集電体１５の各層は、上記の金属材料又は導電性樹脂材料を含んでいてもい。 The current collector 15 is a chemically inactive electrical conductor for continuing current flow 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. Examples of the conductive resin material include a resin obtained by adding a conductive filler to a conductive polymer material or a non-conductive polymer material as necessary. The current collector 15 may comprise multiple layers. In this case, each layer of the current collector 15 may contain the above metal material or conductive resin material.
　集電体１５の表面には、被覆層が形成されていてもよい。当該被覆層は、例えばメッキ処理又はスプレーコート等の公知の方法によって形成されていてもよい。集電体１５は、例えば、板状、箔状（例えば金属箔）、フィルム状又はメッシュ状等を呈していてもよい。金属箔としては、例えば、アルミニウム箔、銅箔、ニッケル箔、チタン箔又はステンレス鋼箔等が挙げられる。ステンレス鋼箔としては、例えば、ＪＩＳ　Ｇ　４３０５：２０１５にて規定されるＳＵＳ３０４、ＳＵＳ３１６又はＳＵＳ３０１等が挙げられる。集電体１５としてステンレス鋼箔を用いることによって、集電体１５の機械的強度を確保することができる。集電体１５は、上記の金属の合金箔又はクラッド箔であってもよい。集電体１５が箔状を呈している場合、集電体１５の厚さは、例えば、１μｍ～１００μｍであってもよい。 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 (for example, a metal foil), a film shape, a mesh shape, or the like. Examples of metal foil include aluminum foil, copper foil, nickel foil, titanium foil, stainless steel foil, and the like. Stainless steel foils include, for example, SUS304, SUS316, SUS301, etc. specified in JIS G 4305:2015. By using a stainless steel foil as the current collector 15, the mechanical strength of the current collector 15 can be ensured. The current collector 15 may be an alloy foil or clad foil of the above metals. When the current collector 15 has a foil shape, the thickness of the current collector 15 may be, for example, 1 μm to 100 μm.
　正極活物質層１６は、リチウムイオン等の電荷担体を吸蔵及び放出し得る正極活物質を含んでいる。正極活物質としては、例えば、層状岩塩構造を有するリチウム複合金属酸化物、スピネル構造を有する金属酸化物、ポリアニオン系化合物等が挙げられる。正極活物質は、リチウムイオン二次電池に使用可能なものであればよい。正極活物質層１６は、複数の正極活物質を含んでいてもよい。本実施形態では、正極活物質層１６は、複合酸化物としてのオリビン型リン酸鉄リチウム（ＬｉＦｅＰＯ４）を含んでいる。 The positive electrode active material layer 16 contains a positive electrode active material capable of intercalating and deintercalating charge carriers such as lithium ions. Examples of positive electrode active materials include lithium composite metal oxides having a layered rock salt structure, metal oxides having a spinel structure, and polyanionic compounds. Any positive electrode active material may be used as long as it can be used in a lithium ion secondary battery. The positive electrode active material layer 16 may contain a plurality of positive electrode active materials. In this embodiment, the positive electrode active material layer 16 contains olivine-type lithium iron phosphate (LiFePO 4 ) as a composite oxide.
　負極活物質層１７は、リチウムイオン等の電荷担体を吸蔵及び放出し得る負極活物質を含んでいる。負極活物質は、単体、合金又は化合物のいずれであってもよい。負極活物質としては、例えば、Ｌｉ、炭素、金属化合物等が挙げられる。負極活物質は、リチウムと合金化可能な元素もしくはその化合物等であってもよい。炭素としては、例えば、天然黒鉛、人造黒鉛、ハードカーボン（難黒鉛化性炭素）又はソフトカーボン（易黒鉛化性炭素）等が挙げられる。人造黒鉛としては、例えば、高配向性グラファイト、メソカーボンマイクロビーズ等が挙げられる。リチウムと合金化可能な元素としては、シリコン（ケイ素）又はスズ等が挙げられる。本実施形態では、負極活物質層１７は、炭素系材料としての黒鉛を含んでいる。 The negative electrode active material layer 17 contains a negative electrode active material capable of intercalating and deintercalating charge carriers such as lithium ions. The negative electrode active material may be a simple substance, an alloy, or a compound. Examples of negative electrode active materials 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 (non-graphitizable carbon), soft carbon (easily graphitizable carbon), and the like. Examples of artificial graphite include highly oriented graphite and mesocarbon microbeads. Elements that can be alloyed with lithium include silicon (silicon), tin, and the like. In this embodiment, the negative electrode active material layer 17 contains graphite as a carbonaceous material.
　正極活物質層１６及び負極活物質層１７のそれぞれ（以下、単に「活物質層」ともいう）は、必要に応じて電気伝導性を高めるための導電助剤、結着剤、電解質（ポリマーマトリクス、イオン伝導性ポリマー、電解液等）、イオン伝導性を高めるための電解質支持塩（リチウム塩）等をさらに含み得る。導電助剤は、各電極１１，１２，１３の導電性を高めるために添加される。導電助剤は、例えばアセチレンブラック、カーボンブラック又はグラファイト等である。 Each of the positive electrode active material layer 16 and the negative electrode active material layer 17 (hereinafter also simply referred to as “active material layer”) contains a conductive aid, a binder, and an electrolyte (polymer matrix) for increasing electrical conductivity as necessary. , ion-conducting polymers, electrolytes, etc.), electrolyte-supporting salts (lithium salts) for enhancing ion conductivity, and the like. A conductive aid is added to increase the conductivity of each electrode 11 , 12 , 13 . The conductive aid is, for example, acetylene black, carbon black or graphite.
　活物質層に含まれる成分又は当該成分の配合比及び活物質層の厚さは特に限定されず、リチウムイオン二次電池についての従来公知の知見が適宜参照され得る。活物質層の厚さは、例えば２～１５０μｍである。活物質層は、ロールコート法等の公知の方法によって集電体１５の表面に形成されていてもよい。集電体１５の表面（片面又は両面）又は活物質層の表面には、各電極１１，１２，１３の熱安定性を向上させるために、耐熱層が設けられていてもよい。耐熱層は、例えば、無機粒子と結着剤とを含み、その他に増粘剤等の添加剤を含んでいてもよい。 The components contained in the active material layer, the compounding ratio of the components, and the thickness of the active material layer are not particularly limited, and conventionally known knowledge about lithium-ion secondary batteries can be appropriately referred to. The thickness of the active material layer is, for example, 2 to 150 μm. The active material layer may be formed on the surface of the current collector 15 by a known method such as roll coating. A heat-resistant layer may be provided on the surface (one side or both sides) of the current collector 15 or the surface of the active material layer in order to improve the thermal stability of each electrode 11 , 12 , 13 . The heat-resistant layer contains, for example, inorganic particles and a binder, and may contain additives such as a thickener.
　結着剤としては、ポリフッ化ビニリデン、ポリテトラフルオロエチレン、フッ素ゴム等の含フッ素樹脂、ポリプロピレン、ポリエチレン等の熱可塑性樹脂、ポリイミド、ポリアミドイミド等のイミド系樹脂、アルコキシシリル基含有樹脂、アクリル酸又はメタクリル酸等のアクリル系樹脂、スチレン－ブタジエンゴム（ＳＢＲ）、カルボキシメチルセルロース、アルギン酸ナトリウム、アルギン酸アンモニウム等のアルギン酸塩、水溶性セルロースエステル架橋体、デンプン－アクリル酸グラフト重合体等が挙げられる。これらの結着剤は、単独で又は複数で用いられ得る。溶媒には、例えば、水、Ｎ－メチル－２－ピロリドン（ＮＭＰ）等が用いられる。 Binders include 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. Alternatively, 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. These binders may be used singly or in combination. Examples of the solvent include water, N-methyl-2-pyrrolidone (NMP), and the like.
　セパレータ１４は、例えば、電解質を吸収保持するポリマーを含む多孔性シート又は不織布であってもよい。セパレータ１４の材料としては、例えば、ポリプロピレン、ポリエチレン、ポリオレフィン、ポリエステル等が挙げられる。セパレータ１４は、単層構造又は多層構造を有していてもよい。多層構造は、例えば、接着層又は耐熱層としてのセラミック層等を有していてもよい。セパレータ１４には、電解質が含浸されていてもよい。セパレータ１４は、高分子電解質又は無機型電解質等の電解質によって構成されていてもよい。セパレータ１４に含浸される電解質としては、例えば、非水溶媒と非水溶媒に溶解された電解質塩とを含む液体電解質（電解液）、又はポリマーマトリクス中に保持された電解質を含む高分子ゲル電解質等が挙げられる。 The separator 14 may be, for example, a porous sheet or non-woven fabric containing a polymer that absorbs and retains the electrolyte. Examples of materials for the separator 14 include polypropylene, polyethylene, polyolefin, and polyester. Separator 14 may have a single-layer structure or a multi-layer structure. The multilayer structure may, for example, have ceramic layers or the like as adhesive layers or heat-resistant layers. The separator 14 may be impregnated with an electrolyte. The separator 14 may be composed of an electrolyte such as a polymer electrolyte or an inorganic electrolyte. The electrolyte impregnated in the separator 14 is, for example, a liquid electrolyte (electrolytic solution) 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.
　セパレータ１４に電解液が含浸される場合、その電解質塩としては、ＬｉＣｌＯ４、ＬｉＡｓＦ６、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＣＦ３ＳＯ３、ＬｉＮ（ＦＳＯ２）２、ＬｉＮ（ＣＦ３ＳＯ２）２等の公知のリチウム塩が用いられていてもよい。また、非水溶媒としては、環状カーボネート類、環状エステル類、鎖状カーボネート類、鎖状エステル類、エーテル類等の公知の溶媒が用いられていてもよい。なお、二種以上のこれらの公知の溶媒材料が組合せて用いられていてもよい。 When the separator 14 is impregnated with an electrolytic solution, the electrolyte salt may be LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 or the like. known lithium salts of may be used. As the nonaqueous solvent, known solvents such as cyclic carbonates, cyclic esters, chain carbonates, chain esters, and ethers may be used. Two or more of these known solvent materials may be used in combination.
　封止部２０は、電極積層体１０を取り囲むように、電極積層体１０の周縁部に形成されている。封止部２０は、各集電体１５の周縁部において、各集電体１５の一方面１５ａ及び他方面１５ｂのそれぞれに接合されている。なお、封止部２０は、各集電体１５の一方面１５ａ及び他方面１５ｂの少なくとも一方に接合されていればよい。封止部２０は、隣り合う各電極１１，１２，１３の間の収容空間Ｓのそれぞれを封止している。それぞれの収容空間Ｓには、電解液が収容されている。封止部２０は、電解液の外部への透過を防止している。封止部２０は、蓄電装置１の外部から収容空間Ｓへの水分等の侵入を防止している。封止部２０は、例えば、充放電反応等により各電極１１，１２，１３で発生したガスが蓄電装置１の外部に漏れることを防止している。各セパレータ１４の縁部は、封止部２０に埋設されていてもよい。 The sealing portion 20 is formed in the peripheral portion of the electrode laminate 10 so as to surround the electrode laminate 10 . The sealing portion 20 is joined to each of the one surface 15 a and the other surface 15 b of each current collector 15 at the periphery of each current collector 15 . The sealing portion 20 may be bonded to at least one of the one surface 15 a and the other surface 15 b of each current collector 15 . The sealing part 20 seals each of the accommodation spaces S between the adjacent electrodes 11 , 12 , 13 . Each accommodation space S accommodates an electrolytic solution. The sealing portion 20 prevents permeation of the electrolytic solution to the outside. The sealing portion 20 prevents moisture or the like from entering the housing space S from the outside of the power storage device 1 . The sealing portion 20 prevents, for example, gas generated at the electrodes 11 , 12 , and 13 due to charge/discharge reactions or the like from leaking to the outside of the power storage device 1 . The edge of each separator 14 may be embedded in the sealing portion 20 .
　封止部２０は、本体部２１と、一対の突出部２２と、を含んでいる。封止部２０の側面２０ａは、電極積層体１０の内外を連通する複数の連通口２０ｂを含んでいる。具体的には、複数の連通口２０ｂのそれぞれは、収容空間Ｓと外部とを連通している。本実施形態では、各連通口２０ｂは、封止部２０の４つの側面のうちの１つの側面２０ａに形成されている。各連通口２０ｂは、Ｘ軸方向から見てＺ軸方向に対して斜めに並ぶように配置されている。 The sealing portion 20 includes a main body portion 21 and a pair of projecting portions 22 . A side surface 20 a of the sealing portion 20 includes a plurality of communication holes 20 b that communicate the inside and outside of the electrode laminate 10 . Specifically, each of the plurality of communication ports 20b communicates the accommodation space S with the outside. In this embodiment, each communication port 20b is formed in one side surface 20a of the four side surfaces of the sealing portion 20. As shown in FIG. The communication ports 20b are arranged obliquely with respect to the Z-axis direction when viewed from the X-axis direction.
　側面２０ａには、各連通口２０ｂを取り囲むように突出する枠部２０ｃが形成されている。具体的には、枠部２０ｃは、Ｘ軸方向から見て、枠状の領域と、当該枠状の領域の内側においてＺ軸方向に沿って延在する複数の直線状の領域と、を含んでいる。枠状の領域と直線状の領域とは、一体となっている。つまり、枠部２０ｃは、Ｘ軸方向から見て、枠状の領域の内側が直線状の領域によって複数の格子に区切られた格子状を呈している。各格子は、連通口２０ｂを取り囲んでいる。本実施形態では、１つの格子が１つの連通口２０ｂを取り囲んでいる。枠部２０ｃは、側面２０ａのうち突出部２２に対応する領域に形成されている。具体的には、枠部２０ｃの枠状の領域のうち、Ｚ軸方向における両側に位置する部分は、突出部２２の側面２０ａに形成されている。 A frame portion 20c is formed on the side surface 20a and protrudes so as to surround each communication port 20b. Specifically, when viewed from the X-axis direction, the frame portion 20c includes a frame-shaped region and a plurality of linear regions extending along the Z-axis direction inside the frame-shaped region. I'm in. The frame-shaped area and the linear area are integrated. That is, the frame portion 20c has a lattice shape in which the inner side of the frame-shaped area is partitioned into a plurality of lattices by linear areas when viewed from the X-axis direction. Each grid surrounds the communication port 20b. In this embodiment, one lattice surrounds one communication port 20b. The frame portion 20c is formed in a region corresponding to the projecting portion 22 on the side surface 20a. Specifically, of the frame-shaped region of the frame portion 20 c , portions located on both sides in the Z-axis direction are formed on the side surfaces 20 a of the projecting portion 22 .
　枠部２０ｃには、封止材５０が設けられている。封止材５０は、樹脂材料を含むシート状の部材である。封止材５０は、Ｘ軸方向から見て、枠部２０ｃの全体を覆っている。封止材５０は、枠部２０ｃの先端に接合されている。これにより、封止材５０は、各連通口２０ｂを封止している。 A sealing material 50 is provided on the frame portion 20c. The sealing material 50 is a sheet-like member containing a resin material. The sealing material 50 covers the entire frame portion 20c when viewed from the X-axis direction. The sealing material 50 is joined to the tip of the frame portion 20c. Thereby, the sealing material 50 seals each communication port 20b.
　封止部２０は、絶縁材料を含んでいる。封止部２０は、各電極１１，１２，１３間を絶縁させることによって、各電極１１，１２，１３間の短絡を防止している。封止部２０の材料としては、例えば、ポリプロピレン、ポリエチレン、ポリスチレン、ＡＢＳ樹脂、変性ポリプロピレン、アクリロニトリルスチレン樹脂等の種々の樹脂材料が挙げられる。 The sealing portion 20 contains an insulating material. The sealing portion 20 prevents short circuits between the electrodes 11 , 12 , 13 by insulating the electrodes 11 , 12 , 13 . Examples of materials for the sealing portion 20 include various resin materials such as polypropylene, polyethylene, polystyrene, ABS resin, modified polypropylene, and acrylonitrile-styrene resin.
　次に、蓄電装置１の製造方法について説明する。図２及び図３に示されるように、まず、積層体３０を準備する（準備工程、ステップＳ１）。積層体３０は、活物質層が設けられた複数の集電体１５（各電極１１，１２，１３）と、集電体１５の厚さ方向（Ｚ軸方向）から見て活物質層を囲う枠状を呈する複数の封止部材４１，３４とを、複数の集電体１５のそれぞれの間に封止部材４１，３４が配置されるように備えている。具体的には、積層体３０は、複数の電極ユニット３１と、電極ユニット３２と、電極ユニット３３と、複数の封止部材（以下、「スペーサ」という）３４と、一対の突出部材３５と、複数のセパレータ１４と、を備えている。複数の封止部材４１、複数のスペーサ３４及び一対の突出部材３５は、封止部２０の形成元となる部材である。 Next, a method for manufacturing the power storage device 1 will be described. As shown in FIGS. 2 and 3, first, the laminate 30 is prepared (preparation step, step S1). The laminate 30 surrounds a plurality of current collectors 15 ( electrodes 11, 12, 13) provided with active material layers and the active material layers when viewed from the thickness direction (Z-axis direction) of the current collectors 15. A plurality of frame-shaped sealing members 41 and 34 are provided so that the sealing members 41 and 34 are arranged between the plurality of current collectors 15 respectively. Specifically, the laminate 30 includes a plurality of electrode units 31, an electrode unit 32, an electrode unit 33, a plurality of sealing members (hereinafter referred to as "spacers") 34, a pair of projecting members 35, and a plurality of separators 14 . The plurality of sealing members 41 , the plurality of spacers 34 and the pair of protruding members 35 are members that form the sealing portion 20 .
　各電極ユニット３１は、バイポーラ電極１１と、バイポーラ電極１１の集電体１５に設けられた封止部材４１と、を有している。電極ユニット３２は、負極終端電極１２と、負極終端電極１２の集電体１５に設けられた封止部材４１と、を有している。電極ユニット３３は、正極終端電極１３と、正極終端電極１３の集電体１５に設けられた封止部材４１と、を有している。 Each electrode unit 31 has a bipolar electrode 11 and a sealing member 41 provided on the current collector 15 of the bipolar electrode 11 . The electrode unit 32 has a negative terminal electrode 12 and a sealing member 41 provided on the current collector 15 of the negative terminal electrode 12 . The electrode unit 33 has a positive terminal electrode 13 and a sealing member 41 provided on the current collector 15 of the positive terminal electrode 13 .
　封止部材４１は、集電体１５の周縁部において、集電体１５の一方面１５ａ及び他方面１５ｂに接合されている。なお、封止部材４１は、集電体１５の一方面１５ａ及び他方面１５ｂの少なくとも一方に接合されていればよい。封止部材４１は、集電体１５の厚さ方向から見て活物質層を囲う枠状を呈している。Ｚ軸方向から見て、封止部材４１の外縁は、集電体１５の外縁よりも外側に位置しており、封止部材４１の内縁は、集電体１５の外縁よりも内側に位置している。封止部材４１は、Ｚ軸方向から見て、集電体１５と重なる本体部分４２と、集電体１５の外縁から外側へ延出する延出部分４３と、を含んでいる。 The sealing member 41 is joined to the one surface 15a and the other surface 15b of the current collector 15 at the periphery of the current collector 15 . The sealing member 41 may be bonded to at least one of the one surface 15 a and the other surface 15 b of the current collector 15 . The sealing member 41 has a frame shape surrounding the active material layer when viewed from the thickness direction of the current collector 15 . When viewed from the Z-axis direction, the outer edge of the sealing member 41 is located outside the outer edge of the current collector 15, and the inner edge of the sealing member 41 is located inside the outer edge of the current collector 15. ing. The sealing member 41 includes a body portion 42 overlapping the current collector 15 and an extension portion 43 extending outward from the outer edge of the current collector 15 when viewed in the Z-axis direction.
　スペーサ３４は、集電体１５の厚さ方向から見て活物質層を囲う枠状を呈している。スペーサ３４は、各電極ユニット３１，３２，３３の間に配置されている。スペーサ３４には、切欠が形成されている。切欠は、スペーサ３４の外縁から内縁まで至っている。積層体３０の１つの外側面において、複数のスペーサ３４のそれぞれの切欠と、Ｚ軸方向に隣り合う封止部材４１とによって画成される各孔部は、Ｘ軸方向から見てＺ軸方向に対して斜めに並ぶように配置されている。積層体３０の孔部には、連通口形成部材４４が挿入されている。つまり、積層体３０の孔部には、連通口形成部材４４が介在している。連通口形成部材４４は、板状を呈している。連通口形成部材４４は、積層体３０の外部から収容空間Ｓまで至っている。具体的には、連通口形成部材４４は、封止部材４１の外縁よりも外側から、封止部材４１の内縁まで至っている。 The spacer 34 has a frame shape surrounding the active material layer when viewed from the thickness direction of the current collector 15 . A spacer 34 is arranged between each electrode unit 31 , 32 , 33 . A notch is formed in the spacer 34 . The notch extends from the outer edge of spacer 34 to the inner edge. In one outer surface of the laminate 30, each hole defined by each notch of the plurality of spacers 34 and the sealing member 41 adjacent in the Z-axis direction extends in the Z-axis direction when viewed from the X-axis direction. are arranged diagonally to the A communication port forming member 44 is inserted into the hole of the laminate 30 . That is, the communication port forming member 44 is interposed in the hole of the laminate 30 . The communication port forming member 44 has a plate shape. The communication port forming member 44 extends from the outside of the laminate 30 to the housing space S. Specifically, the communication port forming member 44 extends from the outside of the outer edge of the sealing member 41 to the inner edge of the sealing member 41 .
　突出部材３５は、短冊状を呈している。一方の突出部材３５は、Ｚ軸方向から見て封止部材４１の延出部分４３と重なるように、電極ユニット３２に対して電極ユニット３１とは反対側に配置されている。一方の突出部材３５は、Ｚ軸方向における一端に位置する封止部材４１（電極ユニット３２の封止部材４１）の延出部分４３上に配置されている。一方の突出部材３５は、Ｚ軸方向における一端に位置する封止部材４１の１つの辺（外縁）に沿って延びている。一方の突出部材３５は、Ｚ軸方向から見て、積層体３０のうち連通口形成部材４４が挿入される複数の孔部が形成された外側面に沿って延びている。 The projecting member 35 has a strip shape. One protruding member 35 is arranged on the side opposite to the electrode unit 31 with respect to the electrode unit 32 so as to overlap the extending portion 43 of the sealing member 41 when viewed in the Z-axis direction. One protruding member 35 is arranged on the extending portion 43 of the sealing member 41 (sealing member 41 of the electrode unit 32) located at one end in the Z-axis direction. One protruding member 35 extends along one side (outer edge) of the sealing member 41 located at one end in the Z-axis direction. One protruding member 35 extends along the outer surface of the laminate 30 in which a plurality of holes into which the communication port forming member 44 is inserted is formed, as viewed from the Z-axis direction.
　他方の突出部材３５は、Ｚ軸方向から見て封止部材４１の延出部分４３と重なるように、電極ユニット３３に対して電極ユニット３１とは反対側に配置されている。他方の突出部材３５は、Ｚ軸方向における他端に位置する封止部材４１（電極ユニット３３の封止部材４１）の延出部分４３上に配置されている。他方の突出部材３５は、Ｚ軸方向における他端に位置する封止部材４１の１つの辺（外縁）に沿って延びている。他方の突出部材３５は、Ｚ軸方向から見て、積層体３０のうち連通口形成部材４４が挿入される複数の孔部が形成された外側面に沿って延びている。 The other projecting member 35 is arranged on the opposite side of the electrode unit 33 from the electrode unit 31 so as to overlap the extending portion 43 of the sealing member 41 when viewed in the Z-axis direction. The other protruding member 35 is arranged on the extending portion 43 of the sealing member 41 (sealing member 41 of the electrode unit 33) located at the other end in the Z-axis direction. The other protruding member 35 extends along one side (outer edge) of the sealing member 41 located at the other end in the Z-axis direction. The other protruding member 35 extends along the outer surface of the laminated body 30 formed with a plurality of holes into which the communication port forming member 44 is inserted, as viewed from the Z-axis direction.
　各封止部材４１及び各スペーサ３４の外縁は、Ｚ軸方向から見て互いに一致又は略一致している。各封止部材４１の内縁は、Ｚ軸方向から見て互いに一致又は略一致している。各スペーサ３４の内縁は、Ｚ軸方向から見て互いに一致又は略一致している。各スペーサ３４の内縁は、Ｚ軸方向から見て各封止部材４１の内縁よりも外側に位置している。各突出部材３５の内縁は、Ｚ軸方向から見て互いに一致又は略一致している。各突出部材３５の内縁は、Ｚ軸方向から見て各スペーサ３４の内縁よりも外側に位置している。積層体３０のうち連通口形成部材４４が挿入される複数の孔部が形成された外側面において、各封止部材４１、各スペーサ３４及び各突出部材３５の外縁は、Ｚ軸方向から見て互いに一致又は略一致している。各突出部材３５は、複数の封止部材４１及び複数のスペーサ３４と共に、積層体３０のうち連通口形成部材４４が挿入される複数の孔部が形成された外側面を構成している。 The outer edges of each sealing member 41 and each spacer 34 match or substantially match each other when viewed from the Z-axis direction. The inner edges of the sealing members 41 match or substantially match each other when viewed from the Z-axis direction. The inner edges of the spacers 34 match or substantially match each other when viewed from the Z-axis direction. The inner edge of each spacer 34 is located outside the inner edge of each sealing member 41 when viewed in the Z-axis direction. The inner edges of the protruding members 35 match or substantially match each other when viewed in the Z-axis direction. The inner edge of each protruding member 35 is located outside the inner edge of each spacer 34 when viewed in the Z-axis direction. On the outer side surface of the laminate 30 in which a plurality of holes into which the communication port forming members 44 are inserted are formed, the outer edges of the sealing members 41, the spacers 34, and the protruding members 35 are They match or substantially match each other. Each protruding member 35 constitutes, together with the plurality of sealing members 41 and the plurality of spacers 34 , the outer surface of the laminate 30 in which a plurality of holes into which the communication port forming members 44 are inserted are formed.
　封止部材４１、スペーサ３４及び突出部材３５のそれぞれの材料は、同じであることが好ましい。これにより、封止部材４１、スペーサ３４及び突出部材３５の相溶性を確保できる。 The materials of the sealing member 41, the spacer 34 and the protruding member 35 are preferably the same. Thereby, the compatibility of the sealing member 41, the spacer 34 and the protruding member 35 can be ensured.
　セパレータ１４は、各電極ユニット３１，３２，３３の間に配置されている。セパレータ１４の縁部は、隣り合う封止部材４１の一方とスペーサ３４との間に配置されている。 The separator 14 is arranged between each of the electrode units 31, 32, 33. The edge of the separator 14 is arranged between one of the adjacent sealing members 41 and the spacer 34 .
　続いて、積層体３０を拘束する（ステップＳ２）。具体的には、Ｚ軸方向（積層体３０の積層方向）から見て正極活物質層１６及び負極活物質層１７が設けられた領域を一対の電極拘束部材５１によって拘束すると共に、Ｚ軸方向から見て封止部材４１が設けられた領域を一対の断熱拘束部材５２によって拘束する。 Then, the laminate 30 is restrained (step S2). Specifically, the regions in which the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided are constrained by a pair of electrode constraining members 51 when viewed from the Z-axis direction (the lamination direction of the laminate 30), and A pair of heat insulating restraining members 52 restrain the region where the sealing member 41 is provided when viewed from above.
　電極拘束部材５１は、Ｚ軸方向から見て積層体３０のうち正極活物質層１６及び負極活物質層１７が設けられた領域を覆う板状を呈している。一対の電極拘束部材５１は、積層体３０に対してＺ軸方向における両側に配置される。一対の電極拘束部材５１は、Ｚ軸方向における積層体３０の両側から、積層体３０のうち封止部材４１よりも内側の部分を挟み込む。電極拘束部材５１の材料は、例えば金属等である。 The electrode binding member 51 has a plate-like shape that covers the region of the laminate 30 where the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided when viewed from the Z-axis direction. A pair of electrode binding members 51 are arranged on both sides of the laminate 30 in the Z-axis direction. A pair of electrode restraint members 51 sandwich portions of the laminate 30 inside the sealing member 41 from both sides of the laminate 30 in the Z-axis direction. The material of the electrode binding member 51 is, for example, metal.
　断熱拘束部材５２は、封止部材４１に沿う枠状を呈している。一対の断熱拘束部材５２は、積層体３０に対してＺ軸方向における周縁部に配置される。断熱拘束部材５２の熱伝導率は、電極拘束部材５１の熱伝導率よりも小さい。断熱拘束部材５２の材料は、例えばフェノール樹脂等である。 The heat insulating restraint member 52 has a frame shape along the sealing member 41 . A pair of heat-insulating restraint members 52 are arranged on the periphery of the laminated body 30 in the Z-axis direction. The thermal conductivity of the heat insulation binding member 52 is smaller than the thermal conductivity of the electrode binding member 51 . The material of the heat insulating restraint member 52 is, for example, phenolic resin.
　一対の断熱拘束部材５２は、Ｚ軸方向における積層体３０の両側から、積層体３０のうち封止部材４１、スペーサ３４及び突出部材３５が設けられている部分を挟み込む。具体的には、断熱拘束部材５２の外縁は、Ｚ軸方向から見て、封止部材４１の外縁及び突出部材３５の外縁と一致している。断熱拘束部材５２の外縁は、Ｚ軸方向から見て、封止部材４１の外縁及び突出部材３５の外縁よりも外側に位置していてもよい。断熱拘束部材５２の内縁は、Ｚ軸方向から見て、封止部材４１の内縁と一致している。断熱拘束部材５２の内縁は、Ｚ軸方向から見て、封止部材４１の内縁よりも内側に位置していてもよい。 The pair of heat insulating restraint members 52 sandwich the portion of the laminate 30 where the sealing member 41, the spacer 34 and the protruding member 35 are provided from both sides of the laminate 30 in the Z-axis direction. Specifically, the outer edge of the heat insulating restraint member 52 matches the outer edge of the sealing member 41 and the outer edge of the projecting member 35 when viewed from the Z-axis direction. The outer edge of the heat insulating restraint member 52 may be located outside the outer edge of the sealing member 41 and the outer edge of the projecting member 35 when viewed in the Z-axis direction. The inner edge of the heat insulating restraint member 52 matches the inner edge of the sealing member 41 when viewed from the Z-axis direction. The inner edge of the heat insulating restraint member 52 may be located inside the inner edge of the sealing member 41 when viewed from the Z-axis direction.
　断熱拘束部材５２は、封止部材４１に当接する第１拘束部５２ａと、突出部材３５に当接する第２拘束部５２ｂと、を有している。第１拘束部５２ａは、封止部材４１に沿う枠状を呈している。第１拘束部５２ａは、Ｚ軸方向から見て、突出部材３５と重なっていない。第１拘束部５２ａは、突出部材３５を避けるように封止部材４１に当接している。第１拘束部５２ａは、Ｚ軸方向から見て、突出部材３５に対してＸ軸方向における一方の側に位置している。第１拘束部５２ａのうち、封止部材４１における突出部材３５が設けられた箇所に沿う部分は、封止部材４１の他の箇所に沿う部分よりもＸ軸方向における長さが短い。換言すると、Ｚ軸方向から見て、第１拘束部５２ａのＹ軸方向に沿って延びる２つの辺部のうち、突出部材３５と近い辺部の幅は、第１拘束部５２ａのその他の辺部の幅よりも小さい。 The heat insulating restraint member 52 has a first restraint portion 52a that contacts the sealing member 41 and a second restraint portion 52b that contacts the projecting member 35 . The first restraint portion 52 a has a frame shape along the sealing member 41 . The first restraint portion 52a does not overlap the protruding member 35 when viewed from the Z-axis direction. The first restraint portion 52a contacts the sealing member 41 so as to avoid the protruding member 35. As shown in FIG. The first restraint portion 52a is located on one side of the projecting member 35 in the X-axis direction when viewed in the Z-axis direction. A portion of the first restraint portion 52a along the portion of the sealing member 41 where the protruding member 35 is provided has a shorter length in the X-axis direction than a portion along other portions of the sealing member 41 . In other words, when viewed from the Z-axis direction, of the two side portions extending along the Y-axis direction of the first restraining portion 52a, the width of the side portion near the protruding member 35 is equal to the width of the other side of the first restraining portion 52a. smaller than the width of the part.
　第２拘束部５２ｂは、第１拘束部５２ａから突出部材３５へ向かってＸ軸方向に突出している。第２拘束部５２ｂは、Ｙ軸方向に沿って延びている。第２拘束部５２ｂは、Ｚ軸方向から見て、突出部材３５と重なっている。Ｚ軸方向における第２拘束部５２ｂの厚みは、Ｚ軸方向における第１拘束部５２ａの厚みよりも小さい。第１拘束部５２ａと第２拘束部５２ｂとの境界には、突出部材３５に沿う段差が形成されている。 The second restraining portion 52b protrudes in the X-axis direction from the first restraining portion 52a toward the protruding member 35. The second restraint portion 52b extends along the Y-axis direction. The second restraint portion 52b overlaps the projecting member 35 when viewed from the Z-axis direction. The thickness of the second restraining portion 52b in the Z-axis direction is smaller than the thickness of the first restraining portion 52a in the Z-axis direction. A step along the projecting member 35 is formed at the boundary between the first restraining portion 52a and the second restraining portion 52b.
　積層体３０のうち、正極活物質層１６及び負極活物質層１７が設けられた領域のＺ軸方向における厚みは、封止部材４１が設けられている領域のＺ軸方向における厚みよりも大きい。電極拘束部材５１及び断熱拘束部材５２によりそれぞれの領域が別々に拘束されるため、封止部材４１が設けられている領域について、Ｚ軸方向に十分な拘束荷重が付与される。これにより、各封止部材４１、各スペーサ３４及び各突出部材３５が互いにＺ軸方向に確実に当接する。 The thickness in the Z-axis direction of the region in which the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided in the laminate 30 is greater than the thickness in the Z-axis direction of the region in which the sealing member 41 is provided. Since each region is separately constrained by the electrode constraining member 51 and the heat insulating constraining member 52, a sufficient constraining load is applied in the Z-axis direction to the region where the sealing member 41 is provided. As a result, the sealing members 41, the spacers 34, and the protruding members 35 are reliably brought into contact with each other in the Z-axis direction.
　続いて、積層体３０が一対の電極拘束部材５１及び一対の断熱拘束部材５２によって拘束され、かつ、各スペーサ３４の各切欠に連通口形成部材４４が介在した状態で、各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させる（溶融工程、ステップＳ３）。 Subsequently, in a state in which the laminated body 30 is bound by the pair of electrode binding members 51 and the pair of heat insulating binding members 52 and the communication port forming member 44 is interposed in each notch of each spacer 34, each sealing member 41, Each spacer 34 and each projecting member 35 are melted (melting step, step S3).
　ステップＳ３では、非接触加熱によって、各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させる。具体的には、図４に示されるように、積層体３０は、加熱装置６０に配置される。加熱装置６０は、例えば赤外線ヒータ等である。ステップＳ３では、加熱装置６０によって各封止部材４１、各スペーサ３４及び各突出部材３５のそれぞれの外側面に対して赤外線を照射する。 In step S3, each sealing member 41, each spacer 34, and each projecting member 35 are melted by non-contact heating. Specifically, as shown in FIG. 4, the laminate 30 is placed in a heating device 60 . The heating device 60 is, for example, an infrared heater. In step S3, the heating device 60 irradiates the outer surfaces of the sealing members 41, the spacers 34, and the protruding members 35 with infrared rays.
　各封止部材４１、各スペーサ３４及び各突出部材３５に赤外線が照射されると、各封止部材４１、各スペーサ３４及び各突出部材３５から熱が生じる。各封止部材４１、各スペーサ３４及び各突出部材３５は、融点以上の温度になるように加熱制御される。これにより、Ｚ軸方向に拘束されることで互いに当接した状態の各封止部材４１、各スペーサ３４及び各突出部材３５が溶融状態となり、互いに溶着されることで一体化される結果、封止体４０が形成される。なお、各切欠に連通口形成部材４４が介在した状態で各封止部材４１、各スペーサ３４及び各突出部材３５が溶融されるため、溶融した樹脂によって各切欠が埋まることが防止される。 When each sealing member 41 , each spacer 34 and each protruding member 35 are irradiated with infrared rays, heat is generated from each sealing member 41 , each spacer 34 and each protruding member 35 . Each sealing member 41, each spacer 34, and each protruding member 35 are heated and controlled so as to have a temperature equal to or higher than the melting point. As a result, the sealing members 41, the spacers 34, and the protruding members 35, which are in contact with each other, are melted by being constrained in the Z-axis direction, and are welded to each other to be integrated. A stop 40 is formed. Since each sealing member 41, each spacer 34, and each protruding member 35 are melted with the communication port forming member 44 interposed in each notch, each notch is prevented from being filled with the melted resin.
　封止体４０は、電極積層体１０を取り囲む矩形筒状を呈している。封止体４０は、本体部４５と、突出部４６と、を含んでいる。本体部４５は、各封止部材４１及び各スペーサ３４が一体化されることで形成された部分である。突出部４６は、突出部材３５が封止部材４１と一体化されることで形成された部分である。本体部４５は、隣り合う各電極１１，１２，１３の間の収容空間Ｓを封止している。 The sealing body 40 has a rectangular tubular shape surrounding the electrode laminate 10 . The sealing body 40 includes a body portion 45 and a projecting portion 46 . The body portion 45 is a portion formed by integrating each sealing member 41 and each spacer 34 . The projecting portion 46 is a portion formed by integrating the projecting member 35 with the sealing member 41 . The body portion 45 seals the accommodation space S between the adjacent electrodes 11 , 12 , 13 .
　封止体４０は、各封止部材４１、各スペーサ３４及び各突出部材３５が溶融することで形成されている側面を含んでいる。側面は、Ｚ軸方向に沿って延びている。側面は、Ｘ軸方向に交差している。側面は、各切欠に対応する複数の連通口４０ｂを含んでいる。連通口４０ｂは、電極積層体１０（積層体３０）の内外を連通している。具体的には、複数の連通口４０ｂのそれぞれは、収容空間Ｓと外部とを連通している。本実施形態では、各連通口４０ｂは、封止体４０の４つの側面のうちの１つの側面４０ａに形成されている。 The sealing body 40 includes side surfaces formed by melting the sealing members 41, the spacers 34, and the protruding members 35. As shown in FIG. The side surface extends along the Z-axis direction. The side faces intersect in the X-axis direction. The side surface includes a plurality of communication ports 40b corresponding to each notch. The communication port 40b communicates the inside and the outside of the electrode laminate 10 (laminate 30). Specifically, each of the plurality of communication ports 40b communicates the accommodation space S with the outside. In this embodiment, each communication port 40b is formed in one side 40a of the four side surfaces of the sealing body 40. As shown in FIG.
　続いて、図５に示されるように、側面４０ａのうち、各連通口４０ｂを取り囲む領域に成型面４０ｃ（図７参照）を形成する（成型工程、ステップＳ４）。成型面４０ｃは、後述する設備側ノズル８０（図１０参照）が押当てられる面である。ステップＳ４では、側面４０ａのうち、本体部４５及び突出部４６に対応する領域に成型面４０ｃを形成する。本実施形態では、複数の連通口４０ｂを含む側面４０ａの全体に成型面４０ｃを形成する。 Subsequently, as shown in FIG. 5, a molding surface 40c (see FIG. 7) is formed in the area surrounding each communication port 40b of the side surface 40a (molding step, step S4). The molding surface 40c is a surface against which an equipment-side nozzle 80 (see FIG. 10), which will be described later, is pressed. In step S4, a molding surface 40c is formed in a region corresponding to the main body portion 45 and the projecting portion 46 in the side surface 40a. In this embodiment, the molding surface 40c is formed on the entire side surface 40a including the plurality of communication ports 40b.
　ステップＳ４では、押付部材７０を側面４０ａに押付けることで、成型面４０ｃを形成する。押付部材７０は、板状を呈している。押付部材７０の材料は、金属である。図６に示されるように、押付部材７０の押付面７０ａには、複数の貫通孔７０ｂと、第１凹部７０ｃと、一対の第２凹部７０ｄと、が形成されている。各貫通孔７０ｂは、各連通口４０ｂに対応するように形成されている。つまり、複数の貫通孔７０ｂは、Ｘ軸方向から見てＺ軸方向に対して斜めに並んでいる。貫通孔７０ｂは、連通口形成部材４４よりも僅かに大きい。連通口形成部材４４は、押付部材７０と摺動しながら貫通孔７０ｂに挿入可能である。 In step S4, the molding surface 40c is formed by pressing the pressing member 70 against the side surface 40a. The pressing member 70 has a plate shape. The material of the pressing member 70 is metal. As shown in FIG. 6, the pressing surface 70a of the pressing member 70 is formed with a plurality of through holes 70b, a first recess 70c, and a pair of second recesses 70d. Each through hole 70b is formed to correspond to each communication port 40b. That is, the plurality of through holes 70b are arranged obliquely with respect to the Z-axis direction when viewed from the X-axis direction. The through hole 70b is slightly larger than the communication port forming member 44. As shown in FIG. The communication port forming member 44 can be inserted into the through hole 70b while sliding with the pressing member 70. As shown in FIG.
　第１凹部７０ｃは、各貫通孔７０ｂを取り囲んでいる。具体的には、第１凹部７０ｃは、Ｘ軸方向から見て、枠状の領域と、当該枠状の領域の内側においてＺ軸方向に沿って延在する複数の直線状の領域と、を含んでいる。枠状の領域と直線状の領域とは、互いに接続されている。つまり、第１凹部７０ｃは、Ｘ軸方向から見て、枠状の領域の内側が直線状の領域によって複数の格子に区切られた格子状を呈している。各格子は、貫通孔７０ｂを取り囲んでいる。本実施形態では、１つの格子が１つの貫通孔７０ｂを取り囲んでいる。一対の第２凹部７０ｄは、第１凹部７０ｃに対してＹ軸方向における両側に位置している。第２凹部７０ｄは、円錐状を呈している。 The first concave portion 70c surrounds each through hole 70b. Specifically, when viewed from the X-axis direction, the first recess 70c includes a frame-shaped region and a plurality of linear regions extending along the Z-axis direction inside the frame-shaped region. contains. The frame-shaped area and the linear area are connected to each other. In other words, the first concave portion 70c has a grid shape in which the inner side of the frame-shaped region is partitioned into a plurality of grids by linear regions when viewed from the X-axis direction. Each grid surrounds a through-hole 70b. In this embodiment, one lattice surrounds one through-hole 70b. The pair of second recesses 70d are positioned on both sides in the Y-axis direction with respect to the first recesses 70c. The second recess 70d has a conical shape.
　ステップＳ４では、押付部材７０の押付面７０ａが側面４０ａに対向し、かつ、押付部材７０の各貫通孔７０ｂに連通口形成部材４４が挿入されるように、押付部材７０を側面４０ａに押付ける。ステップＳ４では、押付部材７０と連通口形成部材４４とを各貫通孔７０ｂにおいて摺動させながら、押付部材７０を側面４０ａに押付ける。これにより、押付部材７０が連通口形成部材４４によってガイドされる。 In step S4, the pressing member 70 is pressed against the side surface 40a such that the pressing surface 70a of the pressing member 70 faces the side surface 40a and the communication hole forming member 44 is inserted into each through hole 70b of the pressing member 70. . In step S4, the pressing member 70 is pressed against the side surface 40a while sliding the pressing member 70 and the communication port forming member 44 in each through hole 70b. Thereby, the pressing member 70 is guided by the communication port forming member 44 .
　ステップＳ４では、溶融状態にある封止体４０の側面４０ａに押付部材７０を押付ける。つまり、ステップＳ４では、未だ完全に固化していない封止体４０の側面４０ａに押付部材７０を押付ける。ステップＳ４では、封止体４０の融点よりも低い温度を有する押付部材７０を側面４０ａに押付ける。例えば、押付部材７０はヒータ等によって加熱されておらず、常温であってもよい。押付部材７０の温度は、押付部材７０が側面４０ａに押付けられる際の封止体４０の温度よりも低い。これにより、押付部材７０によって封止体４０が冷却され、より早く固化されるため、生産性が向上する。押付部材７０の押付面７０ａが封止体４０の側面４０ａに押付けられると、溶融状態にある封止体４０の一部は、押付部材７０の第１凹部７０ｃ及び第２凹部７０ｄに入り込む。 In step S4, the pressing member 70 is pressed against the side surface 40a of the sealing body 40 in the molten state. That is, in step S4, the pressing member 70 is pressed against the side surface 40a of the sealing body 40 which has not yet completely solidified. In step S4, the pressing member 70 having a temperature lower than the melting point of the sealing body 40 is pressed against the side surface 40a. For example, the pressing member 70 may be at room temperature without being heated by a heater or the like. The temperature of the pressing member 70 is lower than the temperature of the sealing body 40 when the pressing member 70 is pressed against the side surface 40a. As a result, the sealing body 40 is cooled by the pressing member 70 and solidified more quickly, thereby improving productivity. When the pressing surface 70 a of the pressing member 70 is pressed against the side surface 40 a of the sealing body 40 , part of the sealing body 40 in the molten state enters the first recess 70 c and the second recess 70 d of the pressing member 70 .
　続いて、図７に示されるように、側面４０ａから押付部材７０を引き離す。これにより、枠部４０ｄ及び一対の係合部４０ｅ（図９参照）を含む成型面４０ｃが形成される。 Subsequently, as shown in FIG. 7, the pressing member 70 is pulled away from the side surface 40a. Thereby, a molding surface 40c including a frame portion 40d and a pair of engaging portions 40e (see FIG. 9) is formed.
　続いて、図８に示されるように、各切欠から連通口形成部材４４を抜出す（ステップＳ５）。これにより、収容空間Ｓと外部とを連通する複数の連通口４０ｂが形成される。図９に示されるように、枠部４０ｄは、各連通口４０ｂを取り囲むように突出している。具体的には、枠部４０ｄは、押付部材７０の第１凹部７０ｃに対応する形状を呈している。枠部４０ｄは、Ｘ軸方向から見て、枠状の領域と、当該枠状の領域の内側においてＺ軸方向に沿って延在する複数の直線状の領域と、を含んでいる。枠状の領域と直線状の領域とは、一体となっている。つまり、枠部４０ｄは、Ｘ軸方向から見て、枠状の領域の内側が直線状の領域によって複数の格子に区切られた格子状を呈している。各格子は、連通口４０ｂを取り囲んでいる。本実施形態では、１つの格子が１つの連通口４０ｂを取り囲んでいる。 Subsequently, as shown in FIG. 8, the communication port forming member 44 is pulled out from each notch (step S5). As a result, a plurality of communication ports 40b are formed that communicate the accommodation space S with the outside. As shown in FIG. 9, the frame portion 40d protrudes so as to surround each communication port 40b. Specifically, the frame portion 40 d has a shape corresponding to the first concave portion 70 c of the pressing member 70 . The frame portion 40d includes a frame-shaped region and a plurality of linear regions extending along the Z-axis direction inside the frame-shaped region when viewed from the X-axis direction. The frame-shaped area and the linear area are integrated. In other words, the frame portion 40d has a grid shape in which the inner side of the frame-shaped region is partitioned into a plurality of grids by linear regions when viewed from the X-axis direction. Each grid surrounds the communication port 40b. In this embodiment, one lattice surrounds one communication port 40b.
　枠部４０ｄは、側面４０ａのうち突出部４６に対応する領域に形成される。具体的には、枠部４０ｄの枠状の領域のうち、Ｚ軸方向における両側に位置する部分は、突出部４６の側面４０ａに形成される。一対の係合部４０ｅは、枠部４０ｄに対してＹ軸方向における両側に形成される。係合部４０ｅは、押付部材７０の第２凹部７０ｄに対応した形状を呈している。係合部４０ｅは、成型面４０ｃから突出している。係合部４０ｅは、円錐状を呈している。係合部４０ｅは、設備側ノズル８０と係合する部分である。 The frame portion 40d is formed in a region of the side surface 40a corresponding to the projecting portion 46. Specifically, of the frame-shaped region of the frame portion 40 d , portions located on both sides in the Z-axis direction are formed on the side surfaces 40 a of the projecting portion 46 . A pair of engaging portions 40e are formed on both sides of the frame portion 40d in the Y-axis direction. The engaging portion 40 e has a shape corresponding to the second recess 70 d of the pressing member 70 . The engaging portion 40e protrudes from the molding surface 40c. The engaging portion 40e has a conical shape. The engaging portion 40 e is a portion that engages with the equipment-side nozzle 80 .
　続いて、各連通口４０ｂを介して各収容空間Ｓに電解液を注液する（ステップＳ６）。具体的には、図１０に示されるように、成型面４０ｃに設備側ノズル８０を押当てる。図１１に示されるように、設備側ノズル８０は、シール面８０ａを有している。シール面８０ａには、複数の注液口８０ｂ及び一対の係合部８０ｃが形成されている。 Subsequently, electrolyte is injected into each housing space S through each communication port 40b (step S6). Specifically, as shown in FIG. 10, the facility-side nozzle 80 is pressed against the molding surface 40c. As shown in FIG. 11, the facility-side nozzle 80 has a sealing surface 80a. A plurality of injection ports 80b and a pair of engaging portions 80c are formed in the sealing surface 80a.
　各注液口８０ｂは、各連通口４０ｂに対応している。具体的には、１つの注液口８０ｂは、枠部４０ｄの１つの格子に対応している。係合部８０ｃは、シール面８０ａに形成された凹部である。係合部８０ｃは、係合部４０ｅに対応した形状を呈している。係合部８０ｃは、円錐状を呈している。 Each injection port 80b corresponds to each communication port 40b. Specifically, one injection port 80b corresponds to one grid of the frame portion 40d. The engaging portion 80c is a recess formed in the sealing surface 80a. The engaging portion 80c has a shape corresponding to the engaging portion 40e. The engaging portion 80c has a conical shape.
　シール面８０ａは、弾性体によって形成されている。シール面８０ａは、例えばパッキンの表面である。ステップＳ６では、シール面８０ａが枠部４０ｄを含む成型面４０ｃに押当てられる。シール面８０ａが成型面４０ｃに押当てられると、枠部４０ｄの少なくとも一部は、シール面８０ａへ食い込む。 The sealing surface 80a is made of an elastic material. The sealing surface 80a is, for example, the surface of a packing. In step S6, the sealing surface 80a is pressed against the molding surface 40c including the frame portion 40d. When the sealing surface 80a is pressed against the molding surface 40c, at least a portion of the frame portion 40d bites into the sealing surface 80a.
　成型面４０ｃに設備側ノズル８０が押当てられた場合における、成型面４０ｃと設備側ノズル８０とのシール性は、例えば封止体４０の他の側面（成型面４０ｃが形成されていない側面）に設備側ノズル８０が押当てられた場合における、他の側面と設備側ノズル８０とのシール性よりも優れる。本実施形態では、成型面４０ｃが枠部４０ｄを含んでいるため、設備側ノズル８０のシール面８０ａが枠部４０ｄに押当てられると、設備側ノズル８０のシール面８０ａが受ける面圧が大きくなる。これにより、成型面４０ｃと設備側ノズル８０とのシール性が向上する。 When the facility-side nozzle 80 is pressed against the molding surface 40c, the sealing performance between the molding surface 40c and the facility-side nozzle 80 is, for example, the other side surface of the sealing body 40 (the side surface on which the molding surface 40c is not formed). It is superior to the sealing property between the other side surface and the equipment-side nozzle 80 when the equipment-side nozzle 80 is pressed against the other side. In the present embodiment, since the molding surface 40c includes the frame portion 40d, when the sealing surface 80a of the facility-side nozzle 80 is pressed against the frame portion 40d, the surface pressure received by the sealing surface 80a of the facility-side nozzle 80 is large. Become. Thereby, the sealing property between the molding surface 40c and the facility-side nozzle 80 is improved.
　続いて、設備側ノズル８０を用いて、収容空間Ｓに電解液を注液する。続いて、各連通口４０ｂを封止する。具体的には、枠部４０ｄに封止材を接合することで、枠部４０ｄに取り囲まれた連通口４０ｂを封止する。これにより、図１に示される蓄電装置１が製造される。本体部４５は、本体部２１（図１参照）に相当する。突出部４６は、突出部２２（図１参照）に相当する。成型面４０ｃは、側面２０ａ（図１参照）に相当する。連通口４０ｂは、連通口２０ｂに相当する（図１参照）。 Subsequently, the equipment-side nozzle 80 is used to inject the electrolyte into the accommodation space S. Subsequently, each communication port 40b is sealed. Specifically, by joining a sealing material to the frame portion 40d, the communication port 40b surrounded by the frame portion 40d is sealed. Thus, power storage device 1 shown in FIG. 1 is manufactured. The body portion 45 corresponds to the body portion 21 (see FIG. 1). The projecting portion 46 corresponds to the projecting portion 22 (see FIG. 1). The molding surface 40c corresponds to the side surface 20a (see FIG. 1). The communication port 40b corresponds to the communication port 20b (see FIG. 1).
　以上説明したように、蓄電装置１の製造方法では、ステップＳ２において、各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させることで、封止体４０の側面４０ａを形成している。これにより、製造工程が簡易化されるため、生産性が向上する。また、ステップＳ３において、非接触加熱によって各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させている。これにより、例えば各封止部材４１、各スペーサ３４及び各突出部材３５に接触する加熱部材等によって各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させる場合に比べ、各封止部材４１、各スペーサ３４及び各突出部材３５から当該加熱部材を引き離す際の各封止部材４１、各スペーサ３４及び各突出部材３５の糸引き等に起因する側面４０ａの変形を抑制できる。しかも、ステップＳ４では、各封止部材４１、各スペーサ３４及び各突出部材３５の融点よりも低い温度を有する押付部材７０を側面４０ａに押付けることで、成型面４０ｃを形成している。これにより、例えば各封止部材４１、各スペーサ３４及び各突出部材３５の融点以上の温度を有する押付部材７０を側面４０ａに押付ける場合に比べ、各封止部材４１、各スペーサ３４及び各突出部材３５から押付部材７０を引き離す際の各封止部材４１、各スペーサ３４及び各突出部材３５の糸引き等に起因する成型面４０ｃの変形を抑制できる。このように、ステップＳ３及びステップＳ４では、変形が抑制された側面４０ａを形成したうえ、更に、変形が抑制された成型面４０ｃを形成している。これにより、設備側ノズル８０とのシール性が確保できる所望の状態の成型面４０ｃを形成しやすくなる。したがって、成型面４０ｃと設備側ノズル８０とのシール性を確保できる。そして、蓄電装置１の製造方法では、側面４０ａの成型に際して押付けられる押付部材７０は、各封止部材４１、各スペーサ３４及び各突出部材３５の融点よりも低い温度を有している。そのため、当該押付部材７０を側面４０ａに押し付ける前に都度押付部材７０を加熱させるための時間、又は、当該押付部材７０を側面４０ａから引き離す際に側面４０ａの変形を抑制するために都度押付部材７０を冷却させる時間を短縮することができ、生産性を向上できる。よって、蓄電装置１の製造方法によれば、生産性の向上及びシール性の確保を実現できる。 As described above, in the method for manufacturing the power storage device 1, the side surface 40a of the sealing body 40 is formed by melting the sealing members 41, the spacers 34, and the protruding members 35 in step S2. . This simplifies the manufacturing process, thereby improving productivity. Further, in step S3, each sealing member 41, each spacer 34, and each protruding member 35 are melted by non-contact heating. As a result, each sealing member 41, each spacer 34, and each protruding member 35 is melted by a heating member or the like that contacts each sealing member 41, each spacer 34, and each protruding member 35, for example. 41 , spacers 34 and protruding members 35 , deformation of the side surface 40 a caused by stringing of the sealing members 41 , spacers 34 and protruding members 35 when the heating member is separated from the spacers 34 and protruding members 35 . Moreover, in step S4, the pressing member 70 having a temperature lower than the melting point of each sealing member 41, each spacer 34 and each protruding member 35 is pressed against the side surface 40a to form the molding surface 40c. As a result, compared to the case where the pressing member 70 having a temperature equal to or higher than the melting points of the sealing members 41, the spacers 34 and the protruding members 35 is pressed against the side surface 40a, the sealing members 41, the spacers 34 and the protruding members 41 and the protruding members 41, 34 Deformation of the molding surface 40c caused by stringing of the sealing members 41, the spacers 34, and the protruding members 35 when the pressing member 70 is pulled away from the member 35 can be suppressed. In this way, in steps S3 and S4, the side surface 40a whose deformation is suppressed is formed, and further, the molding surface 40c whose deformation is suppressed is formed. This makes it easier to form the molding surface 40c in a desired state that can ensure the sealing performance with the facility-side nozzle 80 . Therefore, the sealing performance between the molding surface 40c and the facility-side nozzle 80 can be ensured. In the method for manufacturing the power storage device 1 , the pressing member 70 pressed when molding the side surface 40 a has a temperature lower than the melting point of each sealing member 41 , each spacer 34 and each projecting member 35 . Therefore, the time for heating the pressing member 70 each time before pressing the pressing member 70 against the side surface 40a, or the time for suppressing the deformation of the side surface 40a when the pressing member 70 is separated from the side surface 40a. cooling time can be shortened, and productivity can be improved. Therefore, according to the method for manufacturing the power storage device 1, it is possible to improve productivity and ensure sealing performance.
　ステップＳ４では、連通口４０ｂを取り囲むように突出する枠部４０ｄを含む成型面４０ｃを形成している。これにより、枠部４０ｄに設備側ノズル８０を押当てることで、設備側ノズル８０が受ける面圧を向上でき、成型面４０ｃと設備側ノズル８０とのシール性を向上できる。 In step S4, a molding surface 40c including a frame portion 40d that protrudes so as to surround the communication port 40b is formed. Accordingly, by pressing the equipment-side nozzle 80 against the frame portion 40d, the surface pressure received by the equipment-side nozzle 80 can be improved, and the sealing performance between the molding surface 40c and the equipment-side nozzle 80 can be improved.
　封止部材４１は、Ｚ軸方向から見て、集電体１５と重なる本体部分４２と、集電体１５から延出する延出部分４３と、を含んでいる。これにより、押付部材７０を側面４０ａに押付ける際の押付部材７０と集電体１５との干渉を抑制できる。また、積層体３０は、積層体３０の積層方向の両端に位置する封止部材４１の外縁に沿うように封止部材４１上に配置される突出部材３５を備えている。ステップＳ４では、側面４０ａのうち突出部材３５に対応する領域に成型面４０ｃを形成している。これにより、特に、Ｚ軸方向の両端に位置する収容空間Ｓ（負極終端電極１２とバイポーラ電極１１との間の収容空間Ｓ、又は、正極終端電極１３とバイポーラ電極１１との間の収容空間Ｓ）に対応する成型面４０ｃのシール幅を十分に確保でき、成型面４０ｃと設備側ノズル８０とのシール性を更に向上できる。 The sealing member 41 includes a body portion 42 overlapping the current collector 15 and an extension portion 43 extending from the current collector 15 when viewed from the Z-axis direction. This can suppress interference between the pressing member 70 and the current collector 15 when pressing the pressing member 70 against the side surface 40a. In addition, the laminate 30 includes protruding members 35 arranged on the sealing members 41 along the outer edges of the sealing members 41 positioned at both ends of the laminate 30 in the stacking direction. In step S4, a molding surface 40c is formed in a region corresponding to the projecting member 35 in the side surface 40a. As a result, in particular, the housing space S located at both ends in the Z-axis direction (the housing space S between the negative terminal electrode 12 and the bipolar electrode 11, or the housing space S between the positive terminal electrode 13 and the bipolar electrode 11 ) can be sufficiently ensured for the sealing width of the molding surface 40c, and the sealing performance between the molding surface 40c and the facility-side nozzle 80 can be further improved.
　ステップＳ３では、積層体３０のうち連通口４０ｂに対応する孔部に連通口形成部材４４が介在した状態で、各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させている。これにより、成型面４０ｃの形成時に、押し広げられた側面４０ａによって連通口４０ｂが埋まることを抑制できる。ステップＳ４では、押付部材７０の貫通孔７０ｂに連通口形成部材４４が挿入されるように、押付部材７０を側面４０ａに押付けている。これにより、孔部に連通口形成部材４４が介在する状態においても、押付部材７０を側面４０ａに押付けることで成型面４０ｃを形成できる。 In step S3, each sealing member 41, each spacer 34, and each projecting member 35 are melted while the communication port forming member 44 is interposed in the hole corresponding to the communication port 40b in the laminate 30. As a result, it is possible to prevent the communication opening 40b from being filled with the widened side surface 40a when the molding surface 40c is formed. In step S<b>4 , the pressing member 70 is pressed against the side surface 40 a so that the communication port forming member 44 is inserted into the through hole 70 b of the pressing member 70 . As a result, even when the communication port forming member 44 is interposed in the hole, the molding surface 40c can be formed by pressing the pressing member 70 against the side surface 40a.
　ステップＳ４では、押付部材７０と連通口形成部材４４とを貫通孔７０ｂにおいて摺動させながら、押付部材７０を側面４０ａに押付けている。これにより、連通口形成部材４４を用いて押付部材７０をガイドできる。したがって、成型面４０ｃの位置の精度を向上できる。 In step S4, the pressing member 70 is pressed against the side surface 40a while sliding the pressing member 70 and the communication port forming member 44 in the through hole 70b. As a result, the pressing member 70 can be guided using the communication port forming member 44 . Therefore, the accuracy of the position of the molding surface 40c can be improved.
　ステップＳ３では、Ｚ軸方向から見て正極活物質層１６及び負極活物質層１７が設けられた領域を電極拘束部材５１によって拘束すると共に、Ｚ軸方向から見て封止部材４１が設けられた領域を熱伝導率が電極拘束部材よりも小さい断熱拘束部材５２によって拘束した状態で、各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させている。これにより、積層体３０のうち正極活物質層１６及び負極活物質層１７が設けられた領域のＺ軸方向における厚みと、積層体３０のうち封止部材４１が設けられた領域のＺ軸方向における厚みとが異なっていたとしても、各封止部材４１、各スペーサ３４及び各突出部材３５を確実に拘束して互いに当接した状態にできる。したがって、各封止部材４１、各スペーサ３４及び各突出部材３５を溶融させた際に、互いに溶着させやすい。また、各封止部材４１、各スペーサ３４及び各突出部材３５に加えられた熱が、これらを拘束する断熱拘束部材５２へ逃げることを抑制できるため、熱の逃げによって各封止部材４１、各スペーサ３４及び各突出部材３５が溶融され難いことを抑制できる。 In step S3, the region where the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided is constrained by the electrode constraining member 51 when viewed from the Z-axis direction, and the sealing member 41 is provided when viewed from the Z-axis direction. Each sealing member 41, each spacer 34, and each protruding member 35 are melted in a state where the region is constrained by a heat insulating constraining member 52 having a thermal conductivity lower than that of the electrode constraining member. As a result, the thickness in the Z-axis direction of the region of the laminate 30 where the positive electrode active material layer 16 and the negative electrode active material layer 17 are provided, and the Z-axis direction of the region of the laminate 30 where the sealing member 41 is provided , the sealing members 41, the spacers 34, and the projecting members 35 can be reliably restrained and brought into contact with each other. Therefore, when each sealing member 41, each spacer 34 and each projecting member 35 are melted, they are easily welded to each other. In addition, the heat applied to each sealing member 41, each spacer 34, and each protruding member 35 can be suppressed from escaping to the heat insulation restraining member 52 that restrains them. It is possible to prevent the spacer 34 and each projecting member 35 from being difficult to melt.
　ステップＳ４では、設備側ノズル８０と係合する係合部４０ｅを側面４０ａに形成している。これにより、成型面４０ｃと設備側ノズル８０との位置決めを精度良く行うことができる。 In step S4, an engaging portion 40e that engages with the equipment-side nozzle 80 is formed on the side surface 40a. Thereby, positioning between the molding surface 40c and the facility-side nozzle 80 can be performed with high accuracy.
　本開示は、上記実施形態に限られるものではない。例えば、突出部材３５が延出部分４３に接合されている例を示したが、突出部材３５は、延出部分４３と同一の材料により一体的に形成されていてもよい。また、ステップＳ１で準備される積層体３０は、一対の突出部材３５を備えていなくてもよい。つまり、ステップＳ３では、一対の突出部４６が形成されなくてもよい。この場合、ステップＳ４では、封止体４０の一部がＺ軸方向における本体部４５の両端よりも突出するように、押付部材７０を側面４０ａに押付けることで、側面４０ａを押し広げてもよい。つまり、ステップＳ４では、押付部材７０を側面４０ａに押付けることで、Ｚ軸方向における本体部４５の両端よりも突出する成型面４０ｃを形成してもよい。なお、ステップＳ４では、側面４０ａのうち本体部４５に対応する領域に枠部４０ｄを形成してもよい。 The present disclosure is not limited to the above embodiments. For example, although an example in which the protruding member 35 is joined to the extending portion 43 has been shown, the protruding member 35 may be integrally formed of the same material as the extending portion 43 . Also, the laminate 30 prepared in step S1 may not include the pair of protruding members 35 . That is, in step S3, the pair of projections 46 may not be formed. In this case, in step S4, the side surface 40a is expanded by pressing the pressing member 70 against the side surface 40a so that a portion of the sealing body 40 protrudes from both ends of the body portion 45 in the Z-axis direction. good. That is, in step S4, the pressing member 70 may be pressed against the side surface 40a to form the molding surface 40c that protrudes from both ends of the body portion 45 in the Z-axis direction. In addition, in step S4, the frame portion 40d may be formed in a region corresponding to the body portion 45 in the side surface 40a.
　ステップＳ４では、複数の連通口４０ｂを含む側面４０ａの全体に成型面４０ｃを形成する例を示したが、成型面４０ｃは、側面４０ａのうち連通口４０ｂを取り囲む領域のみに形成されてもよい。つまり、側面４０ａの連通口４０ｂを囲む枠状の領域のみに押付部材７０を押付けることで、連通口４０ｂを囲む枠状の成型面４０ｃを形成してもよい。成型面４０ｃは、複数の連通口４０ｂを囲む１つの領域であってもよいし、各連通口４０ｂを囲む複数の領域であってもよい。 In step S4, an example is shown in which the molding surface 40c is formed on the entire side surface 40a including the plurality of communication holes 40b, but the molding surface 40c may be formed only on the area surrounding the communication holes 40b of the side surface 40a. . In other words, the pressing member 70 may be pressed only against a frame-shaped region surrounding the communication port 40b of the side surface 40a to form the frame-shaped molding surface 40c surrounding the communication port 40b. The molding surface 40c may be one region surrounding the plurality of communication ports 40b, or may be a plurality of regions surrounding each communication port 40b.
　ステップＳ４では、枠部４０ｄを形成しなくてもよい。つまり、成型面４０ｃは、枠部４０ｄを含まなくてもよい。ステップＳ４では、封止体４０の他の側面（成型面４０ｃが形成されていない側面）よりもシール性が優れた成型面４０ｃが形成されればよい。成型面４０ｃは、例えば平坦面であってもよい。この場合、成型面４０ｃの平面度（ＪＩＳＢ０６２１：１９８４で規定される平面形体の幾何学的に正しい平面からの狂いの大きさ）は、封止体４０の他の側面の平面度よりも小さい。これにより、成型面４０ｃに設備側ノズル８０が押当てられた場合における成型面４０ｃと設備側ノズル８０とのシール性を確保できる。なお、成型面４０ｃが枠部４０ｄを含まない場合には、ステップＳ６では、設備側ノズル８０のシール面８０ａに突出部が形成されていてもよい。 It is not necessary to form the frame portion 40d in step S4. That is, the molding surface 40c does not have to include the frame portion 40d. In step S4, the molding surface 40c having better sealing properties than the other side surfaces of the sealing body 40 (the side surface on which the molding surface 40c is not formed) may be formed. The molding surface 40c may be, for example, a flat surface. In this case, the flatness of the molding surface 40 c (the amount of deviation from the geometrically correct plane of the planar shape defined by JISB0621:1984) is smaller than the flatness of the other side surfaces of the sealing body 40 . As a result, it is possible to ensure the sealing performance between the molding surface 40c and the equipment-side nozzle 80 when the equipment-side nozzle 80 is pressed against the molding surface 40c. If the molding surface 40c does not include the frame portion 40d, a projecting portion may be formed on the sealing surface 80a of the facility-side nozzle 80 in step S6.
　ステップＳ１で準備される積層体３０は、スペーサ３４を備えていなくてもよい。この場合、連通口形成部材４４は、隣り合う封止部材４１の間に配置されていてもよい。連通口形成部材４４は、封止部材４１に形成されている切欠に配置されていてもよい。 The laminate 30 prepared in step S1 may not have the spacers 34. In this case, the communication port forming member 44 may be arranged between the adjacent sealing members 41 . The communication port forming member 44 may be arranged in a notch formed in the sealing member 41 .
　ステップＳ６では、電解液の注液だけではなく、例えば設備側ノズルを介して収容空間Ｓの気密検査又は収容空間Ｓの真空引きを行ってもよい。これらの場合においても、成型面４０ｃと設備側ノズルとのシール性を確保できる。 In step S6, not only the injection of the electrolytic solution, but also the airtightness inspection of the accommodation space S or the evacuation of the accommodation space S may be performed, for example, via the equipment-side nozzle. Even in these cases, the sealing performance between the molding surface 40c and the facility-side nozzle can be ensured.
　ステップＳ３で用いられる加熱装置６０が赤外線ヒータである例を示したが、加熱装置６０は、例えば、高周波誘導加熱器又は高温槽であってもよい。 Although an example in which the heating device 60 used in step S3 is an infrared heater is shown, the heating device 60 may be, for example, a high frequency induction heater or a high temperature bath.
　１　　蓄電装置
　１５　　集電体
　１６　　正極活物質層
　１７　　負極活物質層
　３０　　積層体
　３５　　突出部材
　４０ａ　　側面
　４０ｂ　　連通口
　４０ｃ　　成型面
　４０ｄ　　枠部
　４０ｅ　　係合部
　４１　　封止部材
　４２　　本体部分
　４３　　延出部分
　５１　　電極拘束部材
　５２　　断熱拘束部材
　７０　　押付部材
　７０ｂ　　貫通孔
　８０　　設備側ノズル Reference Signs List 1 power storage device 15 current collector 16 positive electrode active material layer 17 negative electrode active material layer 30 laminate 35 protruding member 40a side surface 40b communication port 40c molding surface 40d frame portion 40e engaging portion 41 sealing member 42 body portion 43 extension portion 51 Electrode binding member 52 Thermal insulation binding member 70 Pressing member 70b Through hole 80 Equipment side nozzle

Claims (7)

  1. 　活物質層が設けられた複数の集電体と、前記集電体の厚さ方向から見て前記活物質層を囲う枠状を呈し前記集電体の外縁から外側へ延出する延出部分を有する複数の封止部材とを、前記複数の集電体のそれぞれの間に前記封止部材が配置されるように備えた積層体を準備する準備工程と、
    　前記複数の封止部材を溶融させることで、前記複数の封止部材で構成され、かつ前記積層体の内外を連通する連通口を含む側面を形成する溶融工程と、
    　前記複数の封止部材が溶融することで形成されている前記側面のうち前記連通口を取り囲む領域に、設備側ノズルが押当てられる成型面を形成する成型工程と、を備え、
    　前記溶融工程では、非接触加熱によって前記複数の封止部材を溶融させ、
    　前記成型工程では、前記封止部材が溶融している状態で、前記封止部材の融点よりも低い温度を有する押付部材を前記側面に押付けることで、前記成型面を形成する、蓄電装置の製造方法。     a plurality of current collectors provided with active material layers; and an extension portion having a frame shape surrounding the active material layers when viewed in the thickness direction of the current collectors and extending outward from an outer edge of the current collectors. a preparation step of preparing a laminate comprising a plurality of sealing members having
    A melting step of forming a side surface including a communication port that is configured by the plurality of sealing members and communicates the inside and the outside of the laminate by melting the plurality of sealing members;
    a molding step of forming a molding surface against which an equipment-side nozzle is pressed against a region surrounding the communication port among the side surfaces formed by melting the plurality of sealing members;
    In the melting step, the plurality of sealing members are melted by non-contact heating,
    In the molding step, the molding surface is formed by pressing a pressing member having a temperature lower than the melting point of the sealing member against the side surface while the sealing member is molten. Production method.
  2. 　前記成型工程では、前記連通口を取り囲むように突出する枠部を含む前記成型面を形成する、請求項１に記載の蓄電装置の製造方法。 3. The method of manufacturing a power storage device according to claim 1, wherein, in said molding step, said molding surface including a frame protruding so as to surround said communication port is formed.
  3. 　前記積層体は、前記積層体の積層方向の一端に位置する前記封止部材の外縁に沿うように前記封止部材上に配置される突出部材を更に備え、
    　前記成型工程では、前記側面のうち前記突出部材に対応する領域に前記成型面を形成する、請求項１又は２に記載の蓄電装置の製造方法。     The laminate further comprises a protruding member arranged on the sealing member along the outer edge of the sealing member positioned at one end in the stacking direction of the laminate,
    3. The method of manufacturing a power storage device according to claim 1, wherein in said molding step, said molding surface is formed in a region of said side surface corresponding to said protruding member.
  4. 　前記溶融工程では、前記積層体のうち前記連通口に対応する孔部に連通口形成部材が介在した状態で、前記複数の封止部材を溶融させ、
    　前記成型工程では、前記押付部材の貫通孔に前記連通口形成部材が挿入されるように、前記押付部材を前記側面に押付ける、請求項１～３のいずれか一項に記載の蓄電装置の製造方法。     In the melting step, the plurality of sealing members are melted in a state in which a communication port forming member is interposed in a hole corresponding to the communication port of the laminate,
    The power storage device according to any one of claims 1 to 3, wherein in the molding step, the pressing member is pressed against the side surface so that the communication port forming member is inserted into the through hole of the pressing member. Production method.
  5. 　前記成型工程では、前記押付部材と前記連通口形成部材とを前記貫通孔において摺動させながら、前記押付部材を前記側面に押付ける、請求項４に記載の蓄電装置の製造方法。 5. The method of manufacturing an electric storage device according to claim 4, wherein in said molding step, said pressing member and said communicating port forming member are slid in said through hole while pressing said pressing member against said side surface.
  6. 　前記溶融工程では、前記積層体の積層方向から見て前記活物質層が設けられた領域を電極拘束部材によって拘束すると共に、前記積層方向から見て前記封止部材が設けられた領域を熱伝導率が前記電極拘束部材よりも小さい断熱拘束部材によって拘束した状態で、前記複数の封止部材を溶融させる、請求項１～５のいずれか一項に記載の蓄電装置の製造方法。 In the melting step, a region provided with the active material layer is constrained by an electrode constraining member when viewed from the stacking direction of the laminate, and a region provided with the sealing member is heat-conductive when viewed from the stacking direction. 6. The method of manufacturing a power storage device according to claim 1, wherein the plurality of sealing members are melted while being constrained by a heat insulating constraining member having a modulus smaller than that of the electrode constraining member.
  7. 　前記成型工程では、前記設備側ノズルと係合する係合部を前記側面に形成する、請求項１～６のいずれか一項に記載の蓄電装置の製造方法。 The method for manufacturing a power storage device according to any one of claims 1 to 6, wherein in said molding step, an engaging portion that engages with said facility-side nozzle is formed on said side surface.
PCT/JP2022/012504 2021-06-17 2022-03-18 Method for manufacturing power storage device WO2022264583A1 (en)

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