Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/148—Lids or covers characterised by their shape
  • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/105—Pouches or flexible bags
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—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
  • H01M10/052—Li-accumulators
  • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• • 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
  • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/121—Organic material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered 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
  • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
  • H01M50/256—Carrying devices, e.g. belts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/543—Terminals
  • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
  • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
• • 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 invention relates to an electricity storage device, a lid, a fixing jig, a method for manufacturing an electricity storage device, and a transport jig.
• Patent Document 1 discloses an example of an electricity storage device.
• This electricity storage device includes an electrode body and an exterior body that seals the electrode body.
• the exterior body includes an exterior film that encases the electrode body so that an opening is formed, and a lid body that is placed on the opening. The exterior film and the lid body are joined together.
• an intermediate body is manufactured in which lids are placed on both ends of the electrode body.
• the intermediate body is then moved to the work area for the next manufacturing process.
• the present invention aims to provide an electricity storage device in which the position of the lid body relative to the electrode body is highly accurate, a lid body used in this electricity storage device, a fixing jig and a transport jig used during the manufacture or use of this electricity storage device, and a method for manufacturing this electricity storage device.
• the energy storage device comprises an electrode body and an exterior body that seals the electrode body, the exterior body comprising an exterior film that encases the electrode body so as to form an opening, and a lid body that is placed on the opening, the lid body having a first surface facing the electrode body, a second surface opposite the first surface, a protrusion that protrudes from the second surface, and at least one of a recess that is recessed from the second surface toward the first surface.
• the electric storage device is the electric storage device according to the first aspect, in which the lid body includes a main body having the first surface and the second surface, and the protrusion includes a fixing member joined to the main body.
• the electric storage device is the electric storage device according to the first aspect, in which the lid includes a main body having the first surface and the second surface, the main body has a thick portion protruding from the second surface, and holes are formed in the thick portion and the main body.
• the fourth aspect of the present invention relates to an electric storage device according to the first aspect, in which the protrusion has a breakable portion.
• the fifth aspect of the present invention relates to an electric storage device that is a fixing jig used during the manufacture or use of an electric storage device according to any one of the first to fourth aspects, and includes a lid fixing portion that is fixed to at least one of the protrusion and the recess.
• the lid body according to the sixth aspect of the present invention is a lid body used for an electricity storage device according to any one of the first to fourth aspects, and has a first surface, a second surface opposite the first surface, a protrusion protruding from the second surface, and at least one of a recess recessed from the second surface toward the first surface.
• the seventh aspect of the present invention relates to a method for manufacturing an electric storage device, which includes an electrode body and an exterior body that seals the electrode body, and the exterior body includes an exterior film that wraps the electrode body so that an opening is formed, and a lid body that closes the opening, and the lid body has a first surface facing the electrode body, a second surface opposite to the first surface, a protrusion that protrudes from the second surface, and at least one of a recess that is recessed from the second surface toward the first surface, and the method for manufacturing the electric storage device includes a step of fixing the position of the lid body relative to the electrode body by fixing a jig to at least one of the protrusion and the recess of the lid body that is arranged on the side of the electrode body.
• the transport jig according to the eighth aspect of the present invention is a transport jig for an electrode body, and includes at least a pair of plates that sandwich the electrode body, and a connecting portion that connects the pair of plates.
• the transport jig according to the ninth aspect of the present invention is the transport jig according to the eighth aspect, further comprising a handle attached to at least one of the pair of plates.
• the electricity storage device, lid, fixing jig, electricity storage device manufacturing method, and transport jig of the present invention can contribute to improving the positioning accuracy of the lid relative to the electrode body.
• FIG. 1 is a plan view illustrating an electricity storage device according to an embodiment.
• 1B is a diagram showing a method for measuring the seal strength of a second sealing portion of the electricity storage device in FIG. 1A.
• 1B is a cross-sectional view showing an example of a layer structure of an exterior film included in the electricity storage device of FIG. 1A.
• FIG. 1B is a perspective view of a lid provided in the electricity storage device of FIG. 1A.
• FIG. 1B is a diagram showing a state in which an exterior film provided on the electricity storage device in FIG. 1A is unfolded.
• FIG. 4 is a cross-sectional view of the lid of FIG. 3 .
• FIG. 1B is a perspective view of an intermediate body placed on a fixing jig used in the manufacturing process of the electricity storage device of FIG. 1A .
• 1B is a flowchart showing an example of a manufacturing process for the electricity storage device of FIG. 1A.
• FIG. 8 is a diagram relating to the second step in FIG. 7 .
• FIG. 8 is a diagram relating to the third step of FIG. 7 .
• FIG. 8 is another view of the third step of FIG. 7 .
• 8 is yet another diagram relating to the third step of FIG. 7 .
• 8 is a diagram showing an example of the relationship between strain and stress acting on an exterior film in the third step of FIG. 7 .
• FIG. 8 is a diagram relating to the fourth step in FIG. 7 .
• FIG. 8 is a diagram relating to the fifth step in FIG. 7 .
• 8 is a flowchart showing an example of a fifth step in FIG. 7 .
• FIG. 8 is another view relating to the fifth step of FIG. 7 .
• FIG. 8 is a diagram relating to the sixth step in FIG. 7 .
• 8 is a diagram relating to the eighth and ninth steps of FIG. 7 .
• FIG. 2 is a side view of the power storage device of FIG. 1A with a transportation jig attached thereto.
• FIG. 20 is a plan view of FIG.
• FIG. 13 is a perspective view of a lid provided in an electricity storage device according to a modified example.
• FIG. 13 is a perspective view of a lid provided in an electricity storage device according to another modified example.
• FIG. 13 is a side view of an electricity storage device according to still another modified example.
• FIG. 23 is a perspective view of a fixing jig for fixing the lid body of FIG. 22 .
• FIG. 13 is a plan view of an electricity storage device according to a modified example.
• 8 is a diagram relating to a modified example of the third step in FIG. 7 .
• 8 is a diagram relating to a modified process of the fifth process in FIG. 7 .
• FIG. 8 is a diagram relating to another modified step of the fifth step in FIG. 7, showing the state in which the seal bar is in the initial position.
• 29 is a diagram showing the state in which the seal bar in FIG. 28 is in a reference position.
• FIG. 8 is a diagram showing a process of yet another modified example of the fifth process of FIG. 7 .
• 1B is a flowchart showing a modified example of the manufacturing process for the electricity storage device in FIG. 1A.
• FIG. 1A is a plan view showing a schematic diagram of the electric storage device 10 of the first embodiment.
• FIG. 1B is a diagram showing a method for measuring the seal strength of the second sealing portion 80 of the electric storage device 10.
• FIG. 2 is a cross-sectional view showing a layer structure of an exterior film 50 included in the electric storage device 10 of FIG. 1A.
• FIG. 3 is a perspective view of a lid body 60 included in the electric storage device 10 of FIG. 1A.
• FIG. 4 is a diagram showing a state in which the exterior film 50 included in the electric storage device 10 of FIG. 1A is unfolded.
• FIG. 5 is a cross-sectional view of the lid body 60 of FIG. 3.
• FIG. 1A is a plan view showing a schematic diagram of the electric storage device 10 of the first embodiment.
• FIG. 1B is a diagram showing a method for measuring the seal strength of the second sealing portion 80 of the electric storage device 10.
• FIG. 2 is a cross-sectional view showing a layer
• FIG. 6 is a perspective view showing a state in which an intermediate body is placed on a fixing jig 100 used in the manufacturing process of the electric storage device 10.
• the direction of the arrow UD indicates the thickness direction of the electric storage device 10
• the direction of the arrow LR indicates the width direction of the electric storage device 10
• the direction of the arrow FB indicates the depth direction of the electric storage device 10.
• the directions indicated by the arrows UDLRFB are common to the following figures.
• the power storage device 10 includes an electrode body 20, an electrode terminal 30, and an exterior body 40.
• the electrode body 20 includes electrodes (positive and negative electrodes) constituting a power storage member such as a lithium ion battery, a capacitor, an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, a polyvalent cation battery, or a capacitor, as well as a separator.
• the shape of the electrode body 20 is an approximately rectangular parallelepiped.
• approximately rectangular parallelepiped includes not only a perfect rectangular parallelepiped, but also a solid body that can be regarded as a rectangular parallelepiped by modifying the shape of a portion of the outer surface, for example.
• the shape of the electrode body 20 may be, for example, a cylinder or a polygonal prism.
• the power storage device 10 includes two electrode terminals 30.
• the electrode terminals 30 are metal terminals used for inputting and outputting power to and from the electrode body 20.
• One end of the electrode terminal 30 is electrically connected to an electrode (positive or negative) included in the electrode body 20.
• the other end of the electrode terminal 30 protrudes outward from, for example, an edge of the exterior body 40.
• the electrode terminal 30 only needs to be capable of inputting and outputting power to and from the electrode body 20, and may not, for example, protrude from the exterior body 40.
• the lid body 60 described below is made of, for example, a metal
• the lid body 60 may also function as the electrode terminal 30.
• the lid body 60 functioning as an electrode terminal may or may not protrude from the exterior body 40.
• the metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, or copper.
• the electrode terminal 30 connected to the positive electrode is usually made of aluminum
• the electrode terminal 30 connected to the negative electrode is usually made of copper, nickel, or the like.
• the outermost layer of the electrode body 20 does not necessarily have to be an electrode, and may be, for example, a protective tape or a separator.
• the exterior body 40 seals the electrode body 20.
• the exterior body 40 includes an exterior film 50 and a lid body 60.
• the exterior film 50 wraps the electrode body 20 so as to have an opening 40A.
• the exterior film 50 is wrapped around the electrode body 20 so as to have an opening 40A.
• the lid body 60 is placed in the opening 40A.
• the electrode body 20 may be housed inside the exterior film 50, which is configured in a cylindrical shape so as to form the opening 40A, and the opening 40A may be closed by the lid body 60.
• an adhesive film (not shown) is bonded to the electrode terminal 30.
• Any adhesive film can be selected as long as it can bond the electrode terminal 30 made of metal and the lid 60 made of resin.
• the adhesive film can be, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the adhesive film can be a single layer or two or more layers of these films. In this embodiment, the adhesive film is bonded to substantially the entire portion of the electrode terminal 30 that is covered by the lid 60.
• a storage section for example, there is a method of forming a storage section (recess) in the exterior film 50 through cold forming to accommodate the electrode body 20.
• the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20.
• the exterior film 50 is wrapped so as to contact the outer surface of the electrode body 20.
• the exterior film 50 is wrapped around the outer surface of the electrode body 20 so that it is in contact with the outer surface of the electrode body 20.
• the exterior film 50 is a laminate (laminate film) having, for example, a base layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order.
• the exterior film 50 does not need to include all of these layers, and for example, the barrier layer 52 may not be included. That is, the exterior film 50 may be made of a material that is flexible and easy to bend, and may be made of, for example, a resin film.
• the exterior film 50 is preferably heat-sealable.
• the innermost and outermost layers of the exterior film 50 may be heat-sealable resin layers 53. In this case, the exterior film 50 may encase the electrode body 20 and the lid body 60 by joining the outermost and innermost layers.
• the substrate layer 51 included in the exterior film 50 is a layer for imparting heat resistance to the exterior film 50 and suppressing the occurrence of pinholes that may occur during processing or distribution.
• the substrate layer 51 is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer.
• the barrier layer 52 can be protected during processing of the exterior film 50 and breakage of the exterior film 50 can be suppressed.
• the stretched polyester resin layer is preferably a biaxially stretched polyester resin layer
• the stretched polyamide resin layer is preferably a biaxially stretched polyamide resin layer.
• the stretched polyester resin layer is more preferably a biaxially stretched polyethylene terephthalate (PET) film
• the stretched polyamide resin layer is more preferably a biaxially stretched nylon (ONy) film.
• the substrate layer 51 may be composed of both a stretched polyester resin layer and a stretched polyamide resin layer. From the standpoint of film strength, the thickness of the base layer 51 is preferably, for example, 5 to 300 ⁇ m, and more preferably 5 to 150 ⁇ m.
• the barrier layer 52 is a layer that at least prevents the intrusion of moisture.
• the barrier layer 52 is bonded to the base layer 51 via, for example, an adhesive layer 54.
• Examples of the barrier layer 52 include metal foil, vapor deposition film, and resin layer having barrier properties.
• the vapor deposition film examples include metal vapor deposition film, inorganic oxide vapor deposition film, and carbon-containing inorganic oxide vapor deposition film
• the resin layer examples include fluorine-containing resins such as polyvinylidene chloride, polymers mainly composed of chlorotrifluoroethylene (CTFE), polymers mainly composed of tetrafluoroethylene (TFE), polymers having fluoroalkyl groups, and polymers mainly composed of fluoroalkyl units, and ethylene-vinyl alcohol copolymers.
• CTFE chlorotrifluoroethylene
• TFE tetrafluoroethylene
• the barrier layer 52 examples include resin films having at least one layer of these vapor deposition films and resin layers. The barrier layer 52 may be provided in multiple layers.
• the barrier layer 52 includes a layer composed of a metal material.
• metal materials constituting the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates.
• metal foil it is preferable to use at least one of aluminum alloy foil and stainless steel foil.
• the layer made of the above-mentioned metal material may contain recycled metal material.
• recycled metal material include recycled aluminum alloy, stainless steel, titanium steel, or steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloy can be obtained by the manufacturing method described in WO 2022/092231.
• the barrier layer 52 may be made of only recycled material, or may be made of a mixture of recycled and virgin materials. Note that recycled metal material refers to metal material that has been made reusable by collecting, isolating, and refining various products used in the city and waste from manufacturing processes. Also, virgin metal material refers to new metal material that has been refined from natural metal resources (raw materials) and is not recycled material.
• the aluminum alloy foil is preferably a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of further improving the formability or conformability, it is preferable that the aluminum alloy foil is an iron-containing aluminum alloy foil.
• the iron-containing aluminum alloy foil (100% by mass) the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass.
• an exterior film 50 having better formability can be obtained.
• an exterior film 50 having better flexibility can be obtained.
• the soft aluminum alloy foil examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, etc. may be added as necessary.
• the softening can be performed by annealing or the like. From the viewpoint of improving the mechanical strength of the exterior film 50, it is more preferable that the aluminum alloy foil is a hard aluminum alloy foil composed of, for example, a work-hardened aluminum alloy.
• hard aluminum alloy foils examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-H18, JIS H4160:1994 A8079H-H18, JIS H4000:2014 A8021P-H14, or JIS H4000:2014 A8079P-H14.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. Furthermore, from the viewpoint of providing an exterior film 50 with excellent formability, it is preferable that the stainless steel foil is made of austenitic stainless steel.
• austenitic stainless steels that make up the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.
• the thickness of the barrier layer 52 should at least function as a barrier layer that prevents moisture from penetrating, and may be, for example, about 9 to 200 ⁇ m.
• the thickness of the barrier layer 52 is preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, and particularly preferably about 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably about 10 ⁇ m or more, even more preferably about 20 ⁇ m or more, and more preferably about 25 ⁇ m or more.
• the preferred ranges for the thickness of the barrier layer 52 include about 10 to 85 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 35 ⁇ m, about 20 to 85 ⁇ m, about 20 to 50 ⁇ m, about 20 to 40 ⁇ m, about 20 to 35 ⁇ m, about 25 to 85 ⁇ m, about 25 to 50 ⁇ m, about 25 to 40 ⁇ m, and about 25 to 35 ⁇ m.
• the barrier layer 52 is made of an aluminum alloy foil, the above-mentioned range is particularly preferable.
• the thickness of the barrier layer 52 is preferably about 35 ⁇ m or more, more preferably about 45 ⁇ m or more, even more preferably about 50 ⁇ m or more, and even more preferably about 55 ⁇ m or more, and is preferably about 200 ⁇ m or less, more preferably about 85 ⁇ m or less, even more preferably about 75 ⁇ m or less, and even more preferably about 70 ⁇ m or less.
• the preferable ranges are about 35 to 200 ⁇ m, about 35 to 85 ⁇ m, about 35 to 75 ⁇ m, about 35 to 70 ⁇ m, about 45 to 200 ⁇ m, about 45 to 85 ⁇ m, about 45 to 75 ⁇ m, about 45 to 70 ⁇ m, about 50 to 200 ⁇ m, about 50 to 85 ⁇ m, about 50 to 75 ⁇ m, about 50 to 70 ⁇ m, about 55 to 200 ⁇ m, about 55 to 85 ⁇ m, about 55 to 75 ⁇ m, and about 55 to 70 ⁇ m.
• the high formability of the exterior film 50 makes deep drawing easy, which can contribute to the high capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, even more preferably about 30 ⁇ m or less, and particularly preferably about 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more.
• preferred ranges of the thickness of the stainless steel foil include about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, and about 15 to 25 ⁇ m.
• the barrier layer 52 when the barrier layer 52 is an aluminum foil, it is preferable that at least the surface opposite to the base layer 51 is provided with a corrosion-resistant film in order to prevent dissolution and corrosion.
• the barrier layer 52 may be provided with a corrosion-resistant film on both sides.
• the corrosion-resistant film refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the barrier layer 52 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment such as nickel or chromium, or corrosion prevention treatment by applying a coating agent on the surface of the barrier layer 52.
• the corrosion-resistant film means a film that improves the acid resistance of the barrier layer 52 (acid-resistant film), a film that improves the alkali resistance of the barrier layer 52 (alkali-resistant film), etc.
• the treatment for forming the corrosion-resistant film may be one type, or two or more types may be combined. In addition, it can be formed into not only one layer but also multiple layers.
• hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved by a treatment agent to form metal compounds with excellent corrosion resistance. Note that these treatments may also be included in the definition of chemical conversion treatment.
• the barrier layer 52 has a corrosion-resistant coating
• the corrosion-resistant coating is also included in the barrier layer 52.
• the corrosion-resistant coating prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the substrate layer 51 when the exterior film 50 is formed or wrapped around it, prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by the reaction between the electrolyte and moisture, and in particular prevents dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 52 when the barrier layer 52 is an aluminum alloy foil, and improves the adhesion (wettability) of the surface of the barrier layer 52, preventing delamination between the substrate layer 51 and the barrier layer 52 during heat sealing and between the substrate layer 51 and the barrier layer 52 during forming.
• the barrier layer 52 e.g., aluminum alloy foil
• the heat-sealable resin layer 53 is bonded to the barrier layer 52, for example, via an adhesive layer 55.
• the heat-sealable resin layer 53 included in the exterior film 50 is a layer that provides the exterior film 50 with heat-sealing sealability.
• Examples of the heat-sealable resin layer 53 include resin films made of polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the standpoint of sealability and strength, the thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 has one or more layers with a buffer function (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 53, and more preferably outside the barrier layer 52.
• the buffer layer may be laminated on the outside of the base layer 51, or the base layer 51 may also function as a buffer layer.
• the multiple buffer layers may be adjacent to each other, or may be laminated via the base layer 51, the barrier layer 52, etc.
• the material constituting the buffer layer can be selected from any material having cushioning properties.
• the material having cushioning properties is, for example, rubber, nonwoven fabric, or foam sheet.
• the rubber is, for example, natural rubber, fluororubber, or silicone rubber.
• the rubber hardness is preferably about 20 to 90.
• the material constituting the nonwoven fabric is preferably a material having excellent heat resistance.
• the lower limit of the thickness of the buffer layer is preferably 100 ⁇ m, more preferably 200 ⁇ m, and even more preferably 1000 ⁇ m.
• the upper limit of the thickness of the buffer layer is preferably 5000 ⁇ m, and even more preferably 3000 ⁇ m.
• the preferred range of thickness of the buffer layer is 100 ⁇ m to 5000 ⁇ m, 100 ⁇ m to 3000 ⁇ m, 200 ⁇ m to 5000 ⁇ m, 200 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 5000 ⁇ m, or 1000 ⁇ m to 3000 ⁇ m.
• the most preferred range of thickness of the buffer layer is 1000 ⁇ m to 3000 ⁇ m.
• the lower limit of the thickness of the buffer layer is preferably 0.5 mm.
• the upper limit of the thickness of the buffer layer is preferably 10 mm, more preferably 5 mm, and even more preferably 2 mm.
• the preferred range of the thickness of the buffer layer is 0.5 mm to 10 mm, 0.5 mm to 5 mm, or 0.5 mm to 2 mm.
• the buffer layer functions as a cushion, preventing the exterior film 50 from being damaged by impact when the energy storage device 10 is dropped or by handling during the manufacture of the energy storage device 10.
• the lid body 60 shown in FIG. 3 has, for example, a rectangular parallelepiped shape, and is, for example, a resin molded product made of a resin material.
• the lid body 60 may be a metal molded product.
• the material constituting the lid body 60 may include at least two or more types of material selected from a metal oxide, a carbon material, and a rubber material. It may include a metal oxide, a carbon material, and a rubber material.
• the lid body 60 is preferably made up of a resin material.
• "made up of a resin material” means that, when the entire material constituting the lid body 60 is taken as 100% by mass, the resin material content is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.
• the material constituting the lid body 60 can contain materials other than the resin material in addition to the resin material.
• resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenol resin, as well as modified versions of these resins.
• the resin material may be a mixture of these resins, a copolymer, or a modified version of a copolymer.
• the resin material is preferably a heat-sealable resin such as polyester or polyolefin, and more preferably polyolefin.
• the lid 60 may be molded by any molding method.
• polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters.
• copolymer polyesters include copolymer polyesters in which ethylene terephthalate is the main repeating unit.
• polyethylene terephthalate is the main repeating unit and is polymerized with ethylene isophthalate
• polyethylene (terephthalate/isophthalate) polyethylene (terephthalate/adipate)
• polyethylene (terephthalate/sodium sulfoisophthalate) polyethylene (terephthalate/sodium isophthalate)
• polyethylene (terephthalate/phenyl-dicarboxylate) polyethylene (terephthalate/decanedicarboxylate).
• polybutylene terephthalate is the preferred resin material from the viewpoint of increasing heat resistance and pressure resistance.
• polyolefins include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene- ⁇ -olefin copolymers; polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); propylene- ⁇ -olefin copolymers; and ethylene-butene-propylene terpolymers.
• polyolefin resin is a copolymer, it may be a block copolymer or a random copolymer. Of these, polypropylene is preferred as the resin material because of its excellent heat fusion properties and electrolyte resistance.
• the resin as the resin material may contain a filler as necessary.
• fillers include glass beads, graphite, glass fiber, and carbon fiber.
• the melt mass flow rate of the resin material contained in the material that constitutes the lid body 60 is preferably in the range of 1 g/10 min to 80 g/10 min, and more preferably in the range of 5 g/10 min to 60 g/10 min.
• the melt mass flow rate is measured based on JIS K7210-1:2014.
• the lid body 60 may be configured to include a conductive material.
• Configured to include a conductive material means that, when the entire material constituting the lid body 60 is taken as 100% by mass, the content of the conductive material is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.
• the material constituting the lid body 60 can contain, in addition to the conductive material, materials other than the conductive material.
• the conductive material constituting the lid body 60 is, for example, a metal material.
• the metal material constituting the lid body 60 is, for example, aluminum, aluminum alloy, nickel, copper, or copper alloy.
• the lid body 60 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the lid body 60 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material constituting the lid body 60 connected to the negative electrode may be copper plated with nickel.
• the material constituting the lid body 60 may contain recycled metal material.
• the lid body 60 is made of a conductive material, the lid body 60 also functions as the electrode terminal 30. Since the electrode terminal 30 can be omitted from the power storage device 10, the configuration of the power storage device 10 can be simplified.
• the lid body 60 When the lid body 60 is composed of a conductive material, the lid body 60 may be joined to the exterior film 50 via an adhesive film.
• the adhesive film can be selected arbitrarily as long as it is a film that can bond the exterior film 50 and the lid body 60.
• the adhesive film is preferably a laminated film having at least a heat-sealable resin layer, a heat-resistant base material layer, and a heat-sealable resin layer in this order.
• the specifications for the heat-sealable resin layer of the adhesive film can be the same as those for the heat-sealable resin layer 53.
• the materials constituting the heat-sealable resin layers on both sides of the adhesive film may be the same or different materials, and are appropriately selected according to the materials constituting the heat-sealable resin layer 53 of the exterior film 50 and the materials constituting the lid body 60.
• the material constituting the heat-sealable resin layer on the side of the adhesive film that is bonded to the lid body 60 is preferably an acid-modified polyolefin resin graft-modified with an acid such as maleic anhydride. It is preferable that the heat-sealing resin layer of the adhesive film on the side that is bonded to the exterior film 50 is made of the same material as the material that constitutes the heat-sealing resin layer 53 of the exterior film 50.
• the heat-resistant substrate layer may be any film made of a heat-resistant resin, such as polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, polypropylene, or other unstretched or stretched films.
• a heat-resistant resin such as polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, polypropylene, or other unstretched or stretched films.
• Polyethylene terephthalate is particularly preferred, as it is inexpensive and has high strength.
• the adhesive film preferably has adhesiveness.
• the adhesive film is disposed between the exterior film 50 and the lid 60 and the second sealing portion 80 (described later) is formed, the adhesive film is less likely to shift position relative to the lid 60 and the exterior film 50.
• an adhesive resin into the heat-sealable resin layer of the adhesive film, adhesiveness can be imparted to the adhesive film.
• the adhesive resin include amorphous polyolefins.
• amorphous polyolefins include amorphous polypropylene and copolymers of amorphous propylene and other ⁇ -olefins.
• the content of the adhesive resin in the base material constituting the heat-sealable resin is preferably 10 to 20% by weight or less.
• the lid body 60 has a main body 60A.
• the main body 60A has a first surface 61, a second surface 62, and a sealing surface 63.
• the first surface 61 faces the electrode body 20.
• the second surface 62 is the surface opposite the first surface 61.
• the sealing surface 63 is connected to the first surface 61 and the second surface 62, and is joined to the heat-sealable resin layer 53 of the exterior film 50.
• the sealing surface 63 includes a first sealing surface 63A, a second sealing surface 63B, a third sealing surface 63C, and a fourth sealing surface 63D.
• the first sealing surface 63A constitutes the upper surface of the lid body 60.
• the first sealing surface 63A extends in a first direction (LR direction in this embodiment) in a front view of the lid body 60.
• the second sealing surface 63B and the third sealing surface 63C are connected to the first sealing surface 63A and constitute the side surface of the lid body 60.
• the second sealing surface 63B and the third sealing surface 63C extend in a second direction (UD direction in this embodiment) intersecting the first direction in a front view of the lid body 60.
• the first direction and the second direction are orthogonal in a front view of the lid body 60.
• the first direction and the second direction do not have to be orthogonal in a front view of the lid body 60.
• the fourth sealing surface 63D constitutes the lower surface of the lid body 60.
• the fourth sealing surface 63D extends in the first direction (the LR direction in this embodiment) when the lid 60 is viewed from the front.
• the main body 60A When the main body 60A is plate-shaped, it is preferable that the main body 60A has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged on top of each other. From another perspective, when the main body 60A is plate-shaped, it is preferable that the sealing surface 63 of the main body 60A has a certain degree of thickness so that the sealing surface 63 of the main body 60A and the exterior film 50 can be suitably heat-sealed when forming the second sealing portion 80 described below.
• the minimum value of the thickness of the main body 60A is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum value of the thickness of the main body 60A is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm.
• the maximum value of the thickness of the main body 60A may be 20 mm or more.
• the preferred ranges for the thickness of the material constituting the main body 60A are 1.0 mm to 20 mm, 1.0 mm to 15 mm, 1.0 mm to 10 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 10 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, and 4.0 mm to 10 mm.
• the material constituting the main body 60A does not include films defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the thickness of the main body 60A may vary depending on the part of the main body 60A. When the thickness of the main body 60A varies depending on the part, the thickness of the main body 60A is the thickness of the thickest part.
• the main body 60A further includes boundaries 64, 65, 66, and 67.
• Boundary 64 is the boundary between the first seal surface 63A and the second seal surface 63B.
• Boundary 65 is the boundary between the first seal surface 63A and the third seal surface 63C.
• Boundary 66 is the boundary between the fourth seal surface 63D and the second seal surface 63B.
• Boundary 67 is the boundary between the fourth seal surface 63D and the third seal surface 63C.
• the shapes of boundaries 64 to 67 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 64 to 67 are angular.
• the material constituting the main body 60A may be a polyester resin such as a polyethylene terephthalate resin or a polybutylene terephthalate resin, a polyolefin resin such as a polyethylene resin, a fluorine resin, or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the viewpoint of suitable heat sealing between the main body 60A and the exterior film 50, it is preferable that the main material of the material constituting the main body 60A and the material constituting the heat-sealable resin layer 53 of the exterior film 50 are the same.
• the main material of the main body 60A and the material constituting the heat-sealable resin layer 53 are, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the main material refers to a material that accounts for, for example, 50% or more of the materials contained in the components.
• the main body 60A is formed with a through hole 60X into which the electrode terminal 30 is inserted.
• the through hole 60X penetrates the first surface 61 and the second surface 62.
• the electrode terminal 30 protrudes to the outside of the exterior body 40 through the through hole 60X formed in the main body 60A.
• a small gap between the through hole 60X of the main body 60A and the electrode terminal 30 is filled with, for example, resin.
• the position at which the electrode terminal 30 protrudes to the outside can be selected arbitrarily.
• the electrode terminal 30 may protrude to the outside from a hole formed on any of the six surfaces of the exterior body 40.
• a small gap between the exterior body 40 and the electrode terminal 30 is filled with, for example, resin or film.
• the electrode terminal 30 may protrude to the outside of the exterior body 40 from between the seal surface 63 of the main body 60A and the exterior film 50.
• the through hole 60X may not be formed in the lid 60.
• the main body 60A and the electrode terminal 30 are provided as separate bodies, but the main body 60A and the electrode terminal 30 may be formed integrally. Note that, even if the electrode terminal 30 does not protrude from the edge of the exterior body 40, the main body 60A may not have a through hole 60X.
• an intermediate body is manufactured in which the lid body 60 is placed on both ends of the electrode body 20.
• the intermediate body is moved to the work site for the next process.
• a fixing jig 100 is attached to the intermediate body during the process of moving the intermediate body in order to fix the position of the lid body 60 relative to the electrode body 20. Therefore, in addition to the main body 60A, the lid body 60 has a protrusion 60B to which the fixing jig 100 is attached.
• the protrusion 60B protrudes from the second surface 62 of the main body 60A.
• the number of protrusions 60B provided on the lid body 60 can be selected as desired.
• the lid body 60 has two protrusions 60B.
• the lid body 60 may have one, or three or more protrusions 60B.
• the position on the second surface 62 from which the protrusion 60B protrudes can be selected as desired.
• a through hole 60X is formed in the main body 60A as in this embodiment, it is preferable that the protrusion 60B is formed at a position away from the through hole 60X so that the electrode terminal 30 and the protrusion 60B do not interfere with each other.
• the specific configuration of the protrusion 60B can be selected arbitrarily as long as the fixing jig 100 can be fixed.
• the protrusion 60B is a fixing part embedded in the main body 60A.
• the fixing part is, for example, an insert nut.
• the insert nut is formed with a female thread or a male thread.
• the end of the protrusion 60B opposite to the end protruding from the second surface 62 is embedded inside the main body 60A. That is, the protrusion 60B does not penetrate the main body 60A.
• the insert nut is made of a metal material
• the insert nut is subjected to a corrosion-resistant treatment such as a chromate treatment in order to increase the joining strength with the lid body 60.
• the load capacity of one insert nut is equal to or greater than the weight of the power storage device 10 divided by the total number of protrusions 60B.
• the fixing part may have at least one of a suction cup, a magnet, a protrusion, a Velcro tape (registered trademark), a spring pin, and a clamp so that the fixing jig 100 can be fixed.
• the fixing jig 100 includes a lid fixing portion 110 to which the lid body 60 is fixed, and a mounting portion 120 on which the electrode body 20 is placed.
• the lid fixing portion 110 and the mounting portion 120 are connected by any means.
• the lid fixing portion 110 and the mounting portion 120 may be formed integrally.
• the lid fixing part 110 has a support part 111 on which the lid body 60 is placed, and a wall part 112 rising from the support part 111.
• the wall part 112 has holes 112X formed according to the number of the protrusions 60B.
• the lid body 60 is fixed to the lid fixing part 110 by the thread formed in the insert nut constituting the protrusion 60B engaging with a male thread or a female thread. If the thread formed in the insert nut constituting the protrusion 60B is a female thread, the female thread engages with the male thread inserted into the hole 112X. If the thread formed in the insert nut constituting the protrusion 60B is a male thread, the male thread engages with the female thread formed in the nut or socket, etc.
• the female thread may be entirely disposed outside the hole 112X, or at least a part may be inserted into the hole 112X.
• the wall part 112 further has a slit 112Y formed therein into which the electrode terminal 30 is inserted.
• the slit 112Y penetrates the wall part 112.
• the wall portion 112 may include multiple divided parts, and may be configured to sandwich the electrode terminal 30 between the multiple parts. If the lid body 60 also functions as an electrode terminal, the slit 112Y may be omitted.
• the mounting portion 120 is, for example, plate-shaped, and substantially the entire electrode body 20 is placed on it.
• the fixing jig 100 may be attached to the completed electricity storage device 10. That is, the fixing jig 100 may also be used when the electricity storage device 10 is in use.
• the exterior film 50 is wrapped around the electrode body 20 so as to have an opening 40A, and the opposing surfaces of the exterior film 50 (thermally adhesive resin layer 53) are heat sealed together to form the first sealing portion 70.
• the first sealed portion 70 is formed by heat sealing a portion including the first edge 50A and a portion including the second edge 50B of the exterior film 50 shown in FIG. 4.
• the first sealed portion 70 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position at which the first sealed portion 70 is formed in the exterior body 40 can be selected arbitrarily.
• the root 70X of the first sealed portion 70 is preferably located on the edge 43 at the boundary between the first surface 41 and the second surface 42 of the exterior body 40.
• the first surface 41 has a larger area than the second surface 42.
• the root 70X of the first sealed portion 70 may be located on any surface of the exterior body 40.
• the first sealed portion 70 protrudes outward from the electrode body 20 in a plan view.
• the first sealed portion 70 may be folded, for example, toward the second surface 42 of the exterior body 40, or toward the first surface 41.
• the second sealing portion 80 is formed by heat sealing the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60.
• the sealing strength between the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60 may be referred to as the sealing strength of the second sealing portion 80.
• the sealing strength of the second sealing portion 80 is the sealing strength between the heat-sealable resin layer 53 and the lid body 60 at the long side portion of the sealing surface 63, i.e., the sealing strength between the heat-sealable resin layer 53 and the lid body 60 at the sealing surface 63 extending in the LR (width) direction in FIG. 1A.
• the seal strength of the second sealing portion 80 is measured as follows. First, a cut is made in the portion of the exterior film 50 that constitutes the first surface 41 of the exterior body 40, and three strip-shaped members 41X, 41Y, 41Z (see the two-dot chain line in Figure 1B) are formed aligned in the LR direction. The width of the three strip-shaped members 41X, 41Y, 41Z in the LR direction is 15 mm. The ends of the strip-shaped members 41X, 41Y, 41Z are joined to the lid body 60 at the second sealing portion 80. The length of the lid body 60 in the LR direction is 45 mm or more.
• the seal strength of each of the strip-shaped members 41X, 41Y, 41Z is measured by pulling the end opposite the end joined to the lid body 60 upward in the UD direction (the direction opposite to the first surface 41B).
• the seal strength of the second sealing portion 80 is the average value of the seal strengths of the strip members 41X, 41Y, and 41Z.
• the obtained seal strengths are each divided by the arbitrary width X mm and multiplied by 15 to convert them into the seal strengths of the three strip members in a 15 mm width.
• the seal strength of the second sealing portion 80 is the average value of the seal strengths of the three strip members converted into a 15 mm width. Note that when the lid body 60 is divided into multiple parts including long and short sides, the seal strength of the second sealing portion 80 is the seal strength of the long side portion of the seal surface 63 of the multiple parts.
• the seal strength of the second sealing portion 80 is preferably 40 N/15 mm or more, more preferably 50 N/15 mm or more, more preferably 60 N/15 mm or more, more preferably 70 N/15 mm or more, and even more preferably 85 N/15 mm or more.
• the seal strength of the second sealing portion 80 is 40 N/15 mm or more, the state where the electrode body 20 is sealed by the exterior body 40 is maintained suitably even if the energy storage device 10 is used for, for example, several years (less than 10 years).
• the seal strength of the second sealing portion 80 is 85 N/15 mm or more, the state where the electrode body 20 is sealed by the exterior body 40 is maintained suitably even if the energy storage device 10 is used for, for example, 10 years or more.
• the seal strength of the second sealing portion 80 is preferably 300 N/15 mm or less.
• the preferred range of the seal strength of the second sealing portion 80 is 40N/15mm to 300N/15mm, 50N/15mm to 300N/15mm, 60N/15mm to 300N/15mm, 70N/15mm to 300N/15mm, or 85N/15mm to 300N/15mm.
• Manufacturing method of electricity storage device> 7 is a flowchart showing an example of a method for manufacturing the power storage device 10.
• the method for manufacturing the power storage device 10 includes, for example, a first step, a second step, a third step, a fourth step, a fifth step, a sixth step, a seventh step, an eighth step, and a ninth step.
• the first step to the ninth step are performed, for example, by a manufacturing apparatus for the power storage device 10. Note that the following first step to ninth step are merely names of the steps in the method for manufacturing the power storage device 10 specified for convenience, and do not necessarily refer to the order of the steps.
• step S11 the manufacturing device manufactures a pair of lid units 60Z in which the lid body 60 and the electrode terminal 30 are joined.
• the second step (connection step) of step S12 is performed after the first step.
• the manufacturing device places a pair of lid units 60Z on both ends of the electrode body 20 and electrically connects the electrode terminals 30 and the electrode body 20.
• FIG. 8 is a diagram relating to the second step.
• the manufacturing device uses a positioning device (not shown) to position the pair of lid units 60Z relative to the electrode body 20.
• the long side PA and short side PB of the electrode body 20 in a plan view are used as references to position the pair of lid units 60Z relative to the electrode body 20.
• a known image processing device can be used as the positioning device.
• an image processing device manufactured by Keyence Corporation is used as the image processing device.
• the detection method of the image processing device is edge position measurement using transmission inspection.
• the resolution of the image processing device is 0.01 mm.
• the image processing device is used to detect the short side PB by transmission inspection, and the amount of correction with the reference side on the opposite side is calculated from the position information.
• a fixing jig 100 (see FIG. 6) is attached to the intermediate body including the electrode body 20 and the pair of lid units 60Z. The intermediate body is transported to the work site of the third step with the fixing jig 100 attached.
• the third step (winding step) of step S13 is performed after the second step.
• the fixing jig 100 is removed from the intermediate body.
• the manufacturing equipment wraps the exterior film 50 around the electrode body 20 and the lid body 60.
• the exterior film 50 is positioned relative to the intermediate body based on the long side PA and short side PB set in the second step.
• an exterior film 50 with a larger area than the exterior film 50 of the finished electricity storage device 10 is used to form the protrusion 90 (see FIG. 16).
• the manufacturing device places the electrode body 20 on the exterior film 50.
• the manufacturing device wraps the exterior film 50 around the electrode body 20 and the lid body 60 while pressing at least one of the electrode body 20 and the lid body 60 placed on the exterior film 50 against the exterior film 50.
• the electrode body 20 and the lid body 60 are pressed against the exterior film 50 by, for example, a bar-shaped pressing member 130. Since the third step can be performed with the electrode body 20 and the lid body 60 placed on a table on which the exterior film 50 is placed, the exterior film 50 can be easily wrapped around the electrode body 20 and the lid body 60. It is preferable that the bar-shaped pressing member 130 contacts substantially the entire upper surface of the electrode body 20 and the lid body 60.
• the exterior film 50 is folded so as to form one of the pair of second surfaces 42 of the exterior body 40.
• a portion of the exterior film 50 that corresponds to the corner of the lid body 60 is pressed against the lid body 60 by, for example, a bar-shaped pressing member 140.
• the pressing member 140 may be shaped to press the entire second surface 42 against the electrode body 20 and the lid body 60, or may be, for example, L-shaped to correspond to the corner between the first surface 41 and the second surface 42.
• the exterior film 50 is folded so as to form the other of the pair of second surfaces 42 of the exterior body 40. After the exterior film 50 is folded, the portion of the exterior film 50 that corresponds to the corner of the lid body 60 is pressed against the lid body 60 by, for example, a bar-shaped pressing member 150.
• the exterior film 50 is folded so that the other of the pair of first surfaces 41 of the exterior body 40 is formed.
• the manufacturing device pulls the portion of the exterior film 50 that corresponds to the protruding portion 90 (see FIG. 16) in a given direction with a given strength.
• FIG. 12 is an example of a graph showing the relationship between the strain and stress acting on the exterior film 50. If the strain and stress acting on the exterior film 50 are too small, sagging occurs in the exterior film 50 wrapped around the electrode body 20. In this embodiment, in order to prevent sagging from occurring in the exterior film 50, a predetermined strength is determined so that the strain acting on the exterior film 50 is equal to or greater than a lower limit XA (%) and the stress acting on the exterior film 50 is equal to or greater than a lower limit YA (MPa).
• a predetermined strength is determined so that the strain acting on the exterior film 50 is equal to or less than the upper limit value XB (%) and the stress acting on the exterior film 50 is equal to or less than the upper limit value YB (MPa).
• the portion of the exterior film 50 corresponding to the protruding portion 90 is pulled with a predetermined strength, so that the strain acting on the exterior film 50 is in the range of not less than the lower limit value XA (%) and not more than the upper limit value XB (%), and the stress acting on the exterior film 50 is in the range of not less than the lower limit value YA (MPa) and not more than the upper limit value YB (MPa).
• An example of the lower limit value XA is 0.10 (%).
• An example of the upper limit value XB is 0.43 (%).
• An example of the lower limit value YA is 1.1 (MPa).
• An example of the upper limit value YB is 13.2 (MPa).
• the fourth step of step S14 is performed after the third step.
• the manufacturing device forms a first FB-direction sealed portion 71 having an unsealed portion 71Z in the center of the portion of the exterior film 50 where the protruding portion 90 is formed.
• the first FB-direction sealed portion 71 extends in the FB direction. Note that the hatched portion in FIG. 13 shows an example of the area where the first FB-direction sealed portion 71 is formed.
• the fifth step (sealing step) of step S15 is performed before or after the fourth step.
• the fifth step may also be performed in parallel with the third step.
• the manufacturing apparatus forms the second sealing portion 80.
• the second sealing portion 80 is formed with the fixing jig 100 attached to the lid body 60.
• the shaded area shown in FIG. 14 indicates an example of the area where the second sealing portion 80 is formed.
• the fifth step includes a first sealing step of step S21 and a resealing step of step S22 that is performed after the first sealing step.
• the manufacturing device forms the second sealed portion 80 while moving one of the sealing device 160 (see FIG. 16) and the lid body 60 relative to the other.
• the second sealed portion 80 is formed while the sealing device 160 moves relative to the lid body 60.
• an ultrasonic sealing device or a welding machine is used as the sealing device 160.
• the sealing device 160 may be, for example, a heat sealing device using a roller, or a heat sealing device using a seal bar that is shorter than any of the sealing surfaces 63A-63D of the lid body 60.
• Figure 16 is a diagram relating to the first sealing step.
• the sealing device 160 sequentially joins the sealing surfaces adjacent to the exterior film 50.
• the sealing device 160 moves, for example, to pass through the first sealing surface 63A, the third sealing surface 63C, the fourth sealing surface 63D, and the second sealing surface 63B in that order.
• the sealing device 160 may also move through the second sealing surface 63B, the fourth sealing surface 63D, the third sealing surface 63C, and the first sealing surface 63A in that order.
• the second sealing portion 80 may be formed by two sealing devices 160.
• one sealing device 160 may start moving from the boundary 67 and move to pass through the third sealing surface 63C and the first sealing surface 63A in that order.
• the other sealing device 160 may start moving from the boundary 67 and move to pass through the fourth sealing surface 63D and the second sealing surface 63B in that order.
• the sealing device 160 may start moving from the middle of the first sealing surface 63A, the second sealing surface 63B, the third sealing surface 63C, or the fourth sealing surface 63D.
• the resealing process of step S22 is carried out from the viewpoint of further increasing the sealing strength of the second sealing portion 80.
• the method of the resealing process can be selected arbitrarily.
• the resealing process may be the same method as the first sealing process.
• the first sealing surface 63A to the fourth sealing surface 63D may be heat-sealed in any order using a sealing bar.
• the sixth step of step S16 is performed before or after the fifth step.
• the sixth step may be performed in parallel with the fourth step.
• the manufacturing apparatus forms a first LR direction seal portion 72 extending in the LR direction.
• the first LR direction seal portion 72 is formed so as to overlap partially with the first FB direction seal portion 71 in a portion including the root 70X.
• Completion of the sixth step results in a protrusion portion 90 having a larger area in a plan view than the first sealing portion 70 of the finished power storage device 10.
• the hatched portion in FIG. 17 shows an example of the area where the first LR direction seal portion 72 is formed.
• the seventh step of step S17 is carried out after the sixth step.
• the manufacturing device injects an electrolyte through the opening 90X of the protruding portion 90.
• the edge of the protruding portion 90, including the opening 90X is heat sealed, and the aging step is carried out. Gas generated in the aging step is discharged through the opening 90X.
• the eighth step of step S18 is carried out after the aging step is completed.
• the manufacturing equipment forms the first sealing portion 70.
• the first FB direction seal portion 71 and the first LR direction seal portion 72 are also sealed again. Note that the shaded area in FIG. 18 shows an example of the area where the first sealing portion 70 is formed.
• the ninth step of step S19 is carried out after the eighth step.
• the manufacturing device cuts off the portion of the protrusion 90 other than the first sealing portion 70.
• the dashed dotted line X shown in FIG. 18 is an example of a line indicating the position where the protrusion 90 is cut off in the ninth step.
• a transport jig 200 may be used for transporting the electrode body 20, the intermediate body, or the completed electricity storage device 10 (hereinafter, these are referred to as "objects to be transported").
• Fig. 19 is a side view of the electricity storage device 10 to which the transport jig 200 is attached.
• Fig. 20 is a plan view of Fig. 19.
• the transport jig 200 comprises a pair of plates 211, 212 and a connecting portion 213 that connects the pair of plates 211, 212.
• the plate 211 covers one of the first surfaces 41 of the exterior body 40.
• the plate 212 covers the other of the first surfaces 41 of the exterior body 40.
• a handle 211A is attached to the plate 211. This allows an operator to easily hold the transport jig 200.
• the handle 211A can be omitted.
• the area of the pair of plates 211, 212 in a plan view is larger than the area of the first surface 41 of the exterior body 40. Therefore, in the LR direction, the pair of plates 211, 212 protrude from the first surface 41. Holes 211X, 212X into which the connecting portion 213 is inserted are formed in the portions of the pair of plates 211, 212 that protrude from the first surface 41.
• the specific configuration of the connecting portion 213 can be selected arbitrarily as long as it is a configuration that can connect the pair of plates 211, 212. It is preferable that the connecting portion 213 is detachable from the pair of plates 211, 212 so that the transport jig 200 can be easily attached and detached from the transport object.
• the connecting portion 213 is a bolt.
• the connecting portion 213 is, for example, inserted into the holes 211X, 212X and fixed to the pair of plates 211, 212 by a nut.
• the number of connecting parts 213 provided on the transport jig 200 can be selected arbitrarily.
• the transport jig 200 has six connecting parts 213.
• the transport jig 200 may have one to five, or seven or more connecting parts 213.
• the protrusion 60B is formed on the lid body 60, so that the fixing jig 100 can be attached to the protrusion 60B. Since the position of the lid body 60 relative to the electrode body 20 in the intermediate body can be fixed, the position of the lid body 60 relative to the electrode body 20 is highly accurate.
• the above-mentioned embodiments are examples of possible forms of the electricity storage device, the lid, the fixing jig, the manufacturing method of the electricity storage device, and the transporting jig related to the present invention, and are not intended to limit the forms.
• the electricity storage device, the lid, the fixing jig, the manufacturing method of the electricity storage device, and the transporting jig related to the present invention may take forms different from those exemplified in the embodiments.
• One example is a form in which a part of the configuration of the embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to the embodiment.
• modified embodiments are shown. The following modified examples can be combined with each other as long as there is no technical contradiction.
• FIG. 21 is a perspective view of a modified lid 260.
• the lid 260 may include a main body 60A and a thick portion 261 protruding from the second surface 62 of the main body 60A.
• the number of thick portions 261 included in the lid 260 can be selected arbitrarily.
• the lid 260 includes four thick portions 261.
• the lid 260 may include one to three, or five or more thick portions 261.
• a hole 260X is formed in the thick portion 261 and the main body 60A. It is preferable that the hole 260X does not penetrate the thick portion 261 and the main body 60A.
• the protruding portion 60B is a screw inserted into the hole 260X.
• An arbitrary fixing member may be inserted into the hole 260X.
• a female screw may be formed on the inner peripheral surface of the hole 260X.
• a thick portion may be formed at a position of the first surface 61 of the main body 60A that faces the thick portion 261 through the main body 60A.
• the hole 260X does not penetrate the thick portion 261, the main body 60A, and the thick portion formed on the first surface 61.
• the thick portion 261 and the thick portion formed on the first surface 61 do not have to face each other through the main body 60A.
• the thick portion may be formed on at least one of the first surface 61 and the second surface 62.
• FIG. 22 is a perspective view of a cover 360 of another modified example.
• Cover 360 may include a main body 60A and a protruding portion 360B protruding from the second surface 62 of main body 60A.
• Protruding portion 360B may be formed integrally with main body 60A.
• Protruding portion 360B has a shape corresponding to a pull pin that is provided to suppress warping of cover 60 when cover 360 is insert molded, for example.
• the number of protruding portions 360B may be one, two, or four or more.
• FIG. 23 is a side view of an energy storage device 10 including a cover 460 of yet another modified example.
• Cover 460 has a protrusion 460B.
• Protrusion 460B has a break portion 460X.
• Break portion 460X is a thin portion of protrusion 460B.
• the position at which break portion 460X is formed in protrusion 460B can be selected arbitrarily.
• break portion 460X is formed in the middle of protrusion 460B. Break portion 460X may also be formed at the base of protrusion 460B.
• protrusion 460B is fixed in position relative to electrode body 20 by fixing jig 471. Movement of electrode body 20 is restricted by fixing jig 472.
• step 9 (see FIG. 7) of the manufacturing process for the electricity storage device 10 is completed, the fixing jig 471 is removed from the protrusion 460B, and the protrusion 460B is broken at the breaking portion 460X. Because the protrusion 460B is shortened, the volume of the lid 460 and the volume of the electricity storage device 10 can be reduced. This allows the energy density of the electricity storage device 10 to be increased.
• Fig. 24 is a perspective view of a modified lid fixing part 510.
• the lid fixing part 510 can be used to fix the lid body 360 shown in Fig. 22, for example.
• the lid fixing part 510 has a first fixing part 511 and a second fixing part 512 configured to sandwich the protrusion 360B.
• the first fixing part 511 has three recesses 511A recessed on the opposite side to the second fixing part 512.
• the second fixing part 512 has three recesses 512A recessed on the opposite side to the first fixing part 511.
• the protrusion 360B is sandwiched and fixed between the recesses 511A and 512A facing each other.
• a cushioning material 520 is placed in the recesses 511A at both ends. It is preferable that the cushioning material 520 has flexibility so that it deforms according to the shape of the protrusion 360B.
• the cushioning material 520 can flexibly deform according to the shape of the protrusion 360B when it is sandwiched, it can suitably fix the protrusion 360B even if there is some individual difference in the shape of the protrusion 360B.
• the protrusion 360B is protected by the cushioning material 520, so the protrusion 360B is less likely to be damaged.
• the number of recesses 511A, 512A formed in the lid fixing part 510 can be changed as desired depending on the number of protrusions 360B of the lid body 360 to be fixed.
• a belt-shaped member 700 that is joined to the inner surface of the exterior film 50 may be wound around the electrode body 20.
• Any material may be used as the material constituting the belt-shaped member 700.
• the belt-shaped member 700 may be a sheet made of olefin resin.
• the belt-shaped member 700 may be joined to the inner surface of the exterior film 50 by an adhesive or the like, or may be joined to the inner surface of the exterior film 50 by heat sealing.
• the belt-shaped member 700 may be joined to the electrode body 20, or may not be joined.
• the belt-shaped member 700 is joined to the electrode body 20.
• the position at which the belt-shaped member 700 is wound around the electrode body 20 can be selected arbitrarily.
• the belt-shaped member 700 is wound around the electrode body 20 approximately in the center in the FB direction.
• the protrusion 60B of the lid 60 may be omitted.
• the third step (winding step) of the manufacturing method of the electricity storage device 10 can be changed arbitrarily.
• the size of the exterior film 50 used in the third step is a size that does not protrude from the seal surface 63 of the lid body 60 in the FB direction.
• the exterior film 50 may have an excess portion 50X that protrudes from the seal surface 63 of the lid body 60.
• the excess portion 50X is preferably cut or folded in an arbitrary direction in an arbitrary step performed after the winding step.
• the fifth step (sealing step) of the manufacturing method of the power storage device 10 can be selected arbitrarily.
• the fifth step from the viewpoint of enhancing the sealing property of the boundaries 64 to 67 of the lid body 60, it is preferable to sequentially join adjacent sealing surfaces of the lid body 60.
• a seal bar 610 of a heat sealing device it is preferable to join the exterior film 50 to the first sealing surface 63A, the third sealing surface 63C, the fourth sealing surface 63D, and the second sealing surface 63B in this order.
• the second sealing surface 63B, the fourth sealing surface 63D, the third sealing surface 63C, and the first sealing surface 63A may be joined to the exterior film 50 in this order.
• the first sealing surface 63A and the fourth sealing surface 63D may be heat-sealed before the second sealing surface 63B and the third sealing surface 63C of the lid body 60.
• the second sealing portion 80 may be formed by a heat sealing device.
• the pressure of the seal bar 610 is controlled, the heat-sealable resin layer 53 of the exterior film 50 may melt excessively, and a poly pool may be formed between the seal surface 63 of the lid 60 and the exterior film 50. The poly pool may cause cracks to occur in the exterior film 40. For this reason, it is preferable to control the amount of pressure applied by the seal bar 610 so that the heat-sealable resin layer 53 does not melt excessively.
• the amount of pressure applied by the seal bar 610 is the distance by which the seal bar 610 approaches the lid 60 from the reference position, with the position where the seal bar 610 and the surface of the exterior film 50 come into contact as the reference position. It is preferable that the amount of pressure applied is, for example, about half the thickness of the heat-sealable resin layer 53.
• the amount of depression of the seal bar 610 can be controlled, for example, by an electric cylinder 800 connected to the seal bar 610 shown in FIG. 28.
• a publicly known electric cylinder 800 can be used.
• the electric cylinder 800 includes a main body 810 including a motor and the like, and a rod 820 whose protruding amount relative to the main body 810 changes.
• the seal bar 610 is fixed to the tip of the rod 820.
• FIG. 28 is a diagram showing the initial position of the seal bar 610.
• FIG. 29 is a diagram showing the reference position of the seal bar 610.
• the seal bar 610 in the initial position of the seal bar 610, the seal bar 610 is separated from the exterior film 50 and the lid body 60.
• the amount of protrusion of the rod 820 relative to the main body 810 increases, causing the seal bar 610 to approach the exterior film 50 and the lid body 60, and to reach the reference position shown in FIG. 29.
• the amount of pressing of the seal bar 610 may be controlled by an air cylinder connected to the seal bar 610.
• the second sealing portion 80 is formed in as short a time as possible.
• the lid body 60 is preheated in any step performed before the fifth step.
• the first sealing surface 63A, the second sealing surface 63B, the third sealing surface 63C, and the fourth sealing surface 63D may be heated simultaneously or in any order.
• the lid body 60 can be heated by any means, such as a heater bar, ultrasonic waves, or an infrared lamp.
• the surface of the sealing surface 63 of the lid 60 may have minute irregularities, for example. Therefore, when the second sealing portion 80 is formed by a heat sealing device, the sealing strength may vary for each part of the second sealing portion 80. Furthermore, the size of the poly pool formed between the exterior film 50 and the lid 60 may also vary. From the viewpoint of reducing the variation in the sealing strength and the variation in the size of the poly pool, when a heat sealing device is used in the fifth step, it is preferable to form the second sealing portion 80 with a heat-resistant elastomer 910 sandwiched between the seal bar 610 and the exterior film 50, as shown in FIG. 30.
• the material constituting the elastomer 910 is an elastomer having a melting point equal to or higher than the temperature of the heat sealing conditions.
• the material constituting the elastomer 910 is, for example, a rubber sheet, a silicone sheet, a urethane sheet, or a fluororesin sheet.
• the second sealing portion 80 when a heat sealing device is used in the fifth step, it is preferable to form the second sealing portion 80 with at least the lid body 60 placed on the elastic body 920.
• the electrode body 20 may be placed on the elastic body 920.
• the material for the elastic body 920 may be a sponge. Note that in the example shown in FIG. 30, the elastic body 910 or the elastic body 920 may be omitted.
• Fig. 31 is a flowchart showing a modified example of the manufacturing method of the power storage device 10.
• the modified example of the manufacturing method of the power storage device 10 includes a 31st step and a 32nd step.
• step S31 step 31 (connection step), the manufacturing device connects the electrode body 20 and the electrode terminal 30.
• the 32nd step of step S32 (placement step) is performed after the 31st step.
• the manufacturing equipment places the lid body 60 on both ends of the electrode body 20.
• FIG. 32 is a diagram relating to the 32nd step.
• the electrode terminal 30 and the lid body 60 placed on one side of the electrode body 20 are referred to as the electrode terminal 30L and the lid body 60L, respectively.
• the electrode terminal 30 and the lid body 60 placed on the other side of the electrode body 20 are referred to as the electrode terminal 30R and the lid body 60R, respectively.
• the manufacturing equipment uses an image processing device (not shown) to position one of the lids 60L relative to one of the electrode terminals 30L. As shown in FIG. 31, in the placement process, for example, the positioning of one of the lids 60L relative to one of the electrode terminals 30L is performed based on the long side PAX and short side PBX of one of the electrode terminals 30L in a plan view.
• the image processing device detects the short side PBX by transmission inspection, and calculates the amount of correction with respect to the reference side on the opposite side from the position information.
• the manufacturing equipment performs positioning of the other lid 60R relative to the other electrode terminal 30R based on the long side PAX and short side PBX of one of the electrode terminals 30L.
• the positioning of the other lid body 60R may be performed with respect to the other electrode terminal 30R based on the long side PAX and short side PBY of the other electrode terminal 30R in a plan view.
• the exterior film 50 may be positioned with respect to the intermediate body based on the long side PAX and short side PBX, or the long side PAY and short side PBY set in the placement step.
• the lid body 60 may be formed with a recess that is recessed from the second surface 62 toward the first surface 61 in addition to or instead of the protruding portion 60B.
• the lid body 60 is fixed by inserting the protruding portion of the fixing jig 100 into the recess.
• the cover body 60 may be formed with at least one of a protrusion protruding from the first surface 61 and a recess recessed from the first surface 61 toward the second surface 62.
• the electrode body 20 is fixed by at least one of the protrusion and the recess formed on the first surface 61.
• the shape of the electrode body 20 is maintained by at least one of the protrusion and the recess formed on the first surface 61.
• the exterior film 50 of the power storage device 10 may protrude outward beyond the lid body 60 in the FB direction.
• the portion of the exterior film 50 protruding beyond the lid body 60 may be folded like a Gabeltop pouch or a brick pouch.
• Electrode body 30 Electrode terminal 40: Exterior body 40A: Opening 50: Exterior film 60, 260, 360, 460: Lid body 60B, 360B, 460B: Protrusion 260X: Through hole 261: Thick portion 460X: Fracture portion 61: First surface 62: Second surface 100: Fixing jig 110, 510: Lid fixing portion 200: Transporting jig 211: Plate 211A: Handle 212: Plate 213: Connection portion 700: Belt-shaped member 910: Elastic body 920: Elastic body

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