Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
  • H01G11/80—Gaskets; Sealings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • 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
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/117—Inorganic material
  • H01M50/119—Metals
• • 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
  • H01M50/147—Lids or covers
  • H01M50/155—Lids or covers characterised by the material
  • H01M50/157—Inorganic material
  • H01M50/159—Metals
• • 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
  • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
  • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• the present invention relates to an electricity storage device, an exterior film, and a method for manufacturing an electricity storage device.
• 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 and a lid body that is joined to the exterior film.
• the exterior film and the lid body are joined by heat sealing.
• the present invention aims to provide an electricity storage device with high moisture barrier properties, an exterior film used in 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 having an exterior film that wraps the electrode body and a lid that seals the electrode body together with the exterior film, the exterior film includes a barrier layer that contains a metal material, the lid body includes a portion that contains a metal material, and the barrier layer of the exterior film and the portion of the lid body that contains a metal material are directly bonded.
• the electricity storage device is the electricity storage device according to the first aspect, in which the portion of the exterior film that is joined to the portion of the lid body that contains the metal material is a single layer of the barrier layer.
• the electric storage device is the electric storage device according to the first aspect, in which the exterior film includes another layer laminated to the barrier layer, and the portion of the exterior film that is joined to the portion of the lid body that includes the metal material is a portion where the barrier layer is partially exposed from the other layer.
• the electric storage device is an electric storage device according to any one of the first to third aspects, in which the lid body has a covering body and a lid body joined to the covering body, at least one of the covering body and the lid body is composed of a metal material, the exterior body has a sealing portion in which the exterior film is sandwiched between the covering body and the lid body, and the barrier layer of the exterior film is directly joined to the covering body and the portion of the lid body composed of a metal material in the sealing portion.
• the exterior film according to the fifth aspect of the present invention is an exterior film used as an exterior body of an electricity storage device, the exterior body having a lid body comprising a metal material, the exterior film including a barrier layer comprising a metal material, and the portion of the lid body that is joined to the portion comprising the metal material is a single layer of the barrier layer, or the barrier layer is partially exposed from another layer.
• the manufacturing method for an electricity storage device is a manufacturing method for an electricity storage device comprising an electrode body and an exterior body that seals the electrode body, the exterior body having an exterior film that wraps the electrode body and a lid that seals the electrode body together with the exterior film, the exterior film including a barrier layer that contains a metal material, and the lid including a portion that contains a metal material.
• the manufacturing method for the electricity storage device includes a step of directly joining the barrier layer of the exterior film and the portion of the lid that contains a metal material.
• the electricity storage device, exterior film, and manufacturing method for the electricity storage device according to the present invention have high moisture barrier properties.
• FIG. 1 is a perspective view of an electricity storage device according to an embodiment.
• 2 is a cross-sectional view showing an example of a layer structure of an exterior film included in the electricity storage device of FIG. 1 .
• FIG. 2 is a diagram showing a state in which an exterior film provided on the electricity storage device in FIG. 1 is unfolded.
• FIG. 2 is a perspective view of a covering body provided in the electricity storage device of FIG. 1 .
• 4B is a cross-sectional view taken along line D4B-D4B in FIG. 4A.
• FIG. 2 is a perspective view of a lid body included in the electricity storage device of FIG. 1 .
• FIG. 2 is a front view of the electricity storage device of FIG. 1 .
• FIG. 11 is a cross-sectional view of an electricity storage device according to a first modified example.
• FIG. 11 is a cross-sectional view of an electricity accumulation device according to a second modified example.
• FIG. 13 is a cross-sectional view of an electricity accumulation device according to a third modified example.
• FIG. 13 is a cross-sectional view of another example of an electricity accumulation device according to the third modified example.
• FIG. 13 is a cross-sectional view showing an example of a layer structure of an exterior film 50 included in an electricity storage device according to a fourth modified example.
• the following describes the power storage device according to an embodiment of the present invention with reference to the drawings.
• the numerical range indicated by “-” means “greater than or equal to” or “less than or equal to.”
• the expression 2-15 mm means 2 mm or more and 15 mm or less.
• FIG. 1 is a perspective view that shows a schematic diagram of an electric storage device 10 of an embodiment.
• FIG. 2 is a cross-sectional view showing an example of a layer structure of an exterior film 50 included in the electric storage device 10 of FIG. 1.
• FIG. 3 is a view showing a state in which the exterior film 50 included in the electric storage device 10 of FIG. 1 is unfolded.
• FIG. 4A is a perspective view of a covering body 70 included in the electric storage device 10 of FIG. 1.
• FIG. 4B is a cross-sectional view taken along the line D4B-D4B in FIG. 4A.
• FIG. 5 is a perspective view of a lid body 80 included in the electric storage device 10 of FIG. 1.
• FIG. 6 is a front view of the electric storage device 10 of FIG. 1.
• FIG. 7 is a cross-sectional view taken along the line D7-D7 in FIG. 1.
• the arrow UD direction indicates the thickness direction of the electric storage device 10
• the arrow LR direction indicates the width direction of the electric storage device 10
• the arrow FB direction 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 including a current collector 30 (see FIG. 7) 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.
• 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
• the shape of the electrode body 20 is an approximately rectangular parallelepiped.
• approximately rectangular parallelepiped includes, in addition to a perfect rectangular parallelepiped, 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 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 is wrapped around the electrode body 20.
• the electrode body 20 may be housed inside the exterior film 50, which is configured in a cylindrical shape.
• the exterior body 40 has a pair of first surfaces 41A, 41B and a pair of second surfaces 42A, 42B.
• the pair of first surfaces 41A, 41B are substantially the same size.
• the pair of second surfaces 42A, 42B are substantially the same size.
• the pair of first surfaces 41A, 41B have a larger area than the pair of second surfaces 42A, 42B.
• the pair of lid bodies 60 are each disposed on the side of 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 so as to contact 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 it is sufficient that it includes at least the barrier layer 52.
• the exterior film 50 is only required to 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 the heat-sealable resin layer 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 overall thickness of the exterior film 50 can be selected as desired. From the viewpoint of strength, the thickness of the exterior film 50 is preferably 50 ⁇ m or more. From the viewpoint of formability or conformability, the thickness of the exterior film 50 is preferably 1200 ⁇ m or less. The thickness of the exterior film 50 is preferably within the range of 50 ⁇ m or more and 1200 ⁇ m or less.
• 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 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, and when used as a 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, the aluminum alloy foil is preferably an iron-containing aluminum alloy foil.
• the iron content is preferably 0.1 to 9.0 mass%, and more preferably 0.5 to 2.0 mass%.
• an exterior film 50 having better formability can be obtained.
• an exterior film 50 having better flexibility can be obtained.
• silicon, magnesium, copper, manganese, etc. may be added as necessary.
• the aluminum alloy foil is more preferably a hard aluminum alloy foil made of, for example, a work-hardened aluminum alloy.
• the hard aluminum alloy foil 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.
• the aluminum alloy foil is preferably an aluminum alloy foil containing magnesium.
• the magnesium content is preferably 0.2 to 5.6% by mass, and more preferably 0.2 to 3.0% by mass.
• Examples of aluminum alloy foils containing magnesium include aluminum alloy foils having compositions specified in JIS H4000:2017 A5005P-O, JIS H4000:2017 A5050P-O, and JIS H4000:2017 A5052P-O.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. 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 be such that it at least functions as a barrier layer to prevent the penetration of moisture, and may be, for example, about 5 to 1000 ⁇ 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 9.0 ⁇ m or more, more preferably about 20 ⁇ m or more, and more preferably about 25 ⁇ m or more.
• preferred ranges of the thickness of the barrier layer 52 include about 9.0 to 1000 ⁇ m, about 9.0 to 1000 ⁇ m, about 9.0 to 1000 ⁇ m, about 9.0 to 1000 ⁇ m, about 9.0 to 85 ⁇ m, about 9.0 to 50 ⁇ m, about 9.0 to 40 ⁇ m, about 9.0 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 ranges are particularly preferred.
• 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 exterior film 50 has high formability, which makes deep drawing easy and can contribute to increasing the 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 for 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 is possible to form not only one layer but also multiple layers. Furthermore, among these treatments, 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. Also, if 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 base layer 51 during molding of the exterior film 50, 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 base layer 51 and the barrier layer 52 during heat sealing and between the base layer 51 and the barrier layer 52 during molding.
• 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 layer") 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 has a cover body 70 and a lid main body 80.
• the covering 70 shown in FIG. 4 has a shape similar to a hollow rectangular parallelepiped, for example.
• a space 79 is formed inside the covering 70.
• the material constituting the covering 70 can be selected arbitrarily. From the viewpoint of suitably forming the second sealing portion 92 described later, it is preferable that the covering 70 is composed of a metal material.
• “composed of a metal material” means that when the entire material constituting the covering 70 is taken as 100 mass%, the content of the metal material is 50 mass% or more, preferably 80 mass% or more, more preferably 90 mass% or more, and even more preferably 95 mass% or more.
• the material constituting the covering 70 can contain materials other than metal materials in addition to metal materials.
• the metal material constituting the covering 70 can be selected arbitrarily.
• the metal material constituting the covering 70 is, for example, aluminum, an aluminum alloy, nickel, copper, or a copper alloy.
• the covering 70 connected to the positive electrode is preferably composed of aluminum or an aluminum alloy.
• the coating 70 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material constituting the coating 70 connected to the negative electrode may be copper plated with nickel.
• the material constituting the coating 70 may contain recycled metal materials.
• the coating 70 is made only of metal materials. Since the coating 70 contains a metal material, it also functions as an electrode terminal. This allows the configuration of the electricity storage device 10 to be simplified.
• the coating 70 contains a metal material, it is preferable that the coating 70 has the corrosion-resistant coating described for the barrier layer 52.
• the coating 70 may be composed of a resin material.
• “composed of a resin material” means that, when the entire material constituting the coating 70 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 coating 70 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 joint 80B may be molded by any molding method.
• the resin material contained in the material constituting the coating 70 is preferably an olefin-based random copolymer, more preferably contains a resin containing a polyolefin skeleton as a main component, even more preferably contains polyolefin as a main component, and even more preferably contains polypropylene as a main component.
• the polyolefin may be an acid-modified polyolefin.
• the resin material contained in the material constituting the coating 70 preferably contains multiple types of amide-based lubricants. Furthermore, the resin material contained in the material constituting the coating 70 preferably contains multiple types of amide-based lubricants that further contain unsaturated fatty acid amides in addition to saturated fatty acid amides.
• the resin material contained in the material constituting the coating 70 may be a polyolefin resin to which a propylene-based elastomer having a melting point higher than 150°C has been added.
• 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 constituting the coating 70 is preferably in the range of 1 g/10 min to 100 g/10 min, and more preferably in the range of 5 g/10 min to 80 g/10 min.
• the melt mass flow rate is measured based on JIS K7210-1:2014.
• the measurement temperature for the melt mass flow rate is 230°C.
• the covering body 70 has a first surface 70X and a second surface 70Y.
• the first surface 70X faces the electrode body 20.
• An opening 70Z is formed over almost the entire first surface 70X.
• the second surface 70Y is the surface opposite to the first surface 70X.
• An opening 70YA is formed in the second surface 70Y into which the lid body 80 described later is fitted.
• the opening 70YA penetrates the second surface 70Y.
• the shape of the opening 70YA in front view can be selected arbitrarily depending on the shape of the lid body 80.
• the shape of the opening 70YA may be a square, a rectangle, a polygon having more than one triangle, a circle, or an ellipse. In this embodiment, the shape of the opening 70YA in front view is a rectangle.
• the corners of the opening 70YA are rounded by applying R processing.
• the covering body 70 is composed of a resin material, from the viewpoint of suitably joining the lid body 80, it is preferable that an adhesive film that can be bonded to a metal material and a resin material is bonded to at least a portion of the inner peripheral surface of the opening 70YA.
• the covering body 70 is composed of a resin material, it is preferable that at least a portion of the portion of the covering body 70 that corresponds to the inner peripheral surface of the opening 70YA has a layer that can be bonded to a metal material, from the viewpoint of suitably joining the lid body 80.
• the cover 70 includes an upper portion 71, side portions 72 and 73, a lower portion 74, and a protruding portion 70A.
• the upper portion 71 constitutes the upper surface of the cover 60.
• the upper portion 71 extends in a first direction (LR direction in this embodiment) in a front view of the cover 60.
• the side portions 72 and 73 are connected to the upper portion 71 and constitute the side surfaces of the cover 60.
• the side portions 72 and 73 extend in a second direction (UD direction in this embodiment) that intersects with the first direction in a front view of the cover 60.
• the first direction and the second direction are orthogonal in a front view of the cover 60.
• the first direction and the second direction do not have to be orthogonal in a front view of the cover 60.
• the lower portion 74 constitutes the lower surface of the cover 60.
• the lower portion 74 extends in a first direction (LR direction in this embodiment) in a front view of the cover 60.
• the protrusions 70A protrude inwardly from the upper portion 71, the sides 72, 73, and the lower portion 74 of the covering body 70.
• the protrusions 70A define the portion that covers the lid body 80, in other words, the opening 70YA.
• the amount of protrusion of the protrusions 70A from the upper portion 71, the sides 72, 73, and the lower portion 74 can be selected as desired. The greater the amount of protrusion of the protrusions 70A from the upper portion 71, the sides 72, 73, and the lower portion 74, the smaller the opening area of the opening 70YA.
• the protrusions 70A may be omitted from the covering body 70.
• the covering 70 further includes boundaries 75, 76, 77, and 78.
• Boundary 75 is the boundary between the upper portion 71 and the side portion 72.
• Boundary 76 is the boundary between the upper portion 71 and the side portion 73.
• Boundary 77 is the boundary between the lower portion 74 and the side portion 72.
• Boundary 78 is the boundary between the lower portion 74 and the side portion 73.
• the shapes of boundaries 75 to 78 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 75 to 78 are corners.
• the lid body 80 shown in FIG. 5 is made of a metal material.
• the definition of "made of a metal material” and the specifications of the metal material constituting the lid body 80 are the same as those of the covering body 70.
• the lid body 80 may be made of a resin material.
• the definition of "made of a resin material” and the specifications of the resin material constituting the lid body 80 are the same as those of the covering body 70.
• At least one of the covering body 70 and the lid body 80 is made of a metal material.
• the covering body 70 and the lid body 80 are made of a metal material.
• the lid body 80 has a first surface 81, a second surface 82, and a covering portion 83.
• the first surface 81 faces the electrode body 20.
• the first surface 81 is joined to an end of the current collector (not shown) of the electrode body 20, for example, by welding.
• the second surface 82 is the surface opposite to the first surface 81.
• An electrode terminal may be connected to the second surface 82. If the lid body 80 is made of a metal material, it is preferable that the lid body 80 has a corrosion-resistant coating as described for the barrier layer 52.
• the covering portion 83 is connected to the first surface 81 and the second surface 82, and is at least partially covered by the covering body 70.
• the lid body 80 is fitted into the opening 70YA of the covering body 70, so that the entire covering portion 83 is covered by the inner surface of the opening 70YA.
• a portion of the covering portion 83 may be exposed from the covering body 70.
• the lid body 80 may be fitted into the opening 70Z.
• the covering portion 83 includes a first covering portion 83A, a second covering portion 83B, a third covering portion 83C, and a fourth covering portion 83D.
• the first covering portion 83A constitutes the upper surface of the lid body 80.
• the first covering portion 83A extends in a first direction (LR direction in this embodiment) in a front view of the lid body 80.
• the second covering portion 83B and the third covering portion 83C are connected to the first covering portion 83A and constitute the side surface of the lid body 80.
• the second covering portion 83B and the third covering portion 83C extend in a second direction (UD direction in this embodiment) intersecting the first direction in a front view of the lid body 80.
• the first direction and the second direction are orthogonal in a front view of the lid body 80.
• the first direction and the second direction do not have to be orthogonal in a front view of the lid body 80.
• the fourth covering portion 83D constitutes the lower surface of the lid body 80.
• the fourth covering portion 83D extends in the first direction (the LR direction in this embodiment) when viewed from the front of the lid body 80.
• the coated portion 83 further includes boundaries 84, 85, 86, and 87.
• Boundary 84 is the boundary between the first coated portion 83A and the second coated portion 83B.
• Boundary 85 is the boundary between the first coated portion 83A and the third coated portion 83C.
• Boundary 86 is the boundary between the fourth coated portion 83D and the second coated portion 83B.
• Boundary 87 is the boundary between the fourth coated portion 83D and the third coated portion 83C.
• the shapes of the boundaries 84 to 88 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 84 to 87 are angular.
• the lid body 60 When the lid body 60 is generally plate-shaped, it is preferable that the lid body 60 has a certain 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.
• the minimum value of the thickness of the covering body 70 in the FB direction 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 covering body 70 of the lid body 60 is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm.
• the maximum value of the thickness of the covering body 70 of the lid body 60 may be 20 mm or more.
• the preferred ranges of the thickness of the covering body 70 of the lid body 60 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 thickness of the covering body 70 of the lid body 60 may vary depending on the part of the lid body 60. If the thickness of the covering body 70 of the lid body 60 varies depending on the part, the thickness of the covering body 70 of the lid body 60 is the thickness of the thickest part.
• the first sealing portion 91 is formed by heat sealing the opposing surfaces (heat-sealable resin layers 53) of the exterior film 50.
• the first sealing portion 91 includes a portion where the first edge 50A and the second edge 50B of the exterior film 50 shown in FIG. 3 are overlapped.
• the first sealing portion 91 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position where the first sealing portion 91 is formed in the exterior body 40 can be selected arbitrarily.
• the root 91X of the first sealing portion 91 is preferably located on the edge 43 at the boundary between the first surface 41A and the second surface 42A of the exterior body 40.
• the root 91X of the first sealing portion 91 may be located on any surface of the exterior body 40. From the viewpoint of configuring the power storage device 10 in a small size, it is preferable that the first sealing portion 91 is folded, for example, on the first surface 41A or the second surface 42A of the exterior body 40 when the power storage device 10 is used.
• the second sealing portion 92 (see Figures 6 and 7) is formed by sandwiching a portion including the end of the exterior film 50 in the FB direction between the inner surface of the opening 70YA of the covering body 70 and the covering portion 83.
• the barrier layer 52 of the exterior film 50 and the portion of the lid body 60 that contains a metal material are directly bonded to each other.
• “directly bonded” means that the barrier layer 52 of the exterior film 50 and the portion of the lid body 60 that contains a metal material are bonded to each other without any other elements.
• the cover 70 and the lid body 80 contain a metal material. Therefore, in the second sealing portion 92, the barrier layer 52 of the exterior film 50 is directly bonded to the cover 70 and the lid body 80.
• the barrier layer 52 of the exterior film 50 and the cover 70 and the lid body 80 are bonded to each other by, for example, metal welding.
• Metal welding is, for example, arc welding, TIG welding, spot welding, brazing, gas welding, or laser welding.
• the barrier layer 52 of the exterior film 50 and the cover 70 and the lid body 80 may be bonded to each other by, for example, ultrasonic welding.
• the barrier layer 52 of the exterior film 50 may be directly bonded to the upper portion 71, the side portions 72, 73, and the lower portion 74 of the covering body 70.
• the covering body 70 and the lid body 80 may be bonded by metal welding, crimping, or by using an adhesive. Note that in FIG. 7, the adhesive layers 54 and 55 are omitted from the illustration in order to simplify the drawing.
• the portion of the exterior film 50 that constitutes the second sealing portion 92 in other words, the portion of the exterior film 50 that is joined to the covering body 70 and the lid body 80, does not have the base material layer 51 and the heat-sealable resin layer 53 laminated to the barrier layer 52.
• the portion of the exterior film 50 that constitutes the second sealing portion 92 is a single layer of the barrier layer 52.
• Manufacturing method of electricity storage device> 8 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, and a sixth step.
• the first step to the sixth step are performed, for example, by a manufacturing device for the power storage device 10. At least a part of the first step to the sixth step may be performed by an operator.
• the first step to the sixth step are names of the steps in the method for manufacturing the power storage device 10 defined for convenience, and do not necessarily refer to the order of the steps. The order of the following steps can be changed as desired.
• the manufacturing device places a pair of lid bodies 80 on the sides of the electrode body 20 and electrically connects the electrode body 20 and the lid bodies 80.
• step S2 is carried out after the first step.
• the manufacturing device wraps the electrode body 20 and the pair of lid bodies 80 in an exterior film 50.
• the third step of step S3 is performed after the second step.
• an end seal portion is formed.
• the end seal portion is a portion of the exterior film 50 where the first sealing portion 91 is to be formed, in which a predetermined range including both ends in the LR direction is joined.
• the end seal portion is folded toward the first surface 41A or the second surface 42A.
• the fourth step of step S4 is performed after the third step.
• the manufacturing device fits the lid body 80 into the opening 70YA of the covering body 70.
• the portion of the exterior film 50 including the end in the FB direction and the end seal portion are sandwiched between the inner surface of the opening 70YA of the covering body 70 and the covering portion 83 of the lid body 80.
• the fifth step of step S5 is performed after the fourth step.
• the manufacturing equipment forms the second sealing portion 92 by welding the covering body 70, the lid body 80, and the exterior film 50 together. Because the joining of the covering body 70, the lid body 80, and the exterior film 50 can be completed in a single step, the energy storage device 10 can be easily manufactured.
• the sixth step of step S6 is carried out before or after the fifth step.
• the manufacturing device forms a first sealed portion 91 by heat-sealing the heat-sealable resin layer 53 in the portion including the first edge 50A of the exterior film 50 and the heat-sealable resin layer 53 in the portion including the second edge 50B.
• the barrier layer 52 of the exterior film 50 and the portion of the lid body 60 that is configured to contain a metal material are directly joined by welding, which prevents moisture from penetrating into the interior of the exterior body 40 from the second sealing portion 92. For this reason, the electricity storage device 10 has high moisture barrier properties.
• the above-mentioned embodiments are examples of possible forms of the electricity storage device, exterior film, and manufacturing method of the electricity storage device according to the present invention, and are not intended to limit the forms.
• the electricity storage device, exterior film, and manufacturing method of the electricity storage device according 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.
• Some examples of modified embodiments are shown. Note that the following modified examples can be combined with each other as long as there is no technical contradiction.
• the covering body 70 may be configured to include a resin material
• the lid body 80 may be configured to include a metal material.
• FIG. 9 is a cross-sectional view of the electricity storage device 10 of the first modified example.
• the exterior film 50 preferably has the innermost and outermost layers being heat-sealable resin layers 53A and 53B.
• the heat-sealable resin layer 53A which is the innermost layer, is preferably partially removed.
• the heat-sealable resin layer 53A which is the innermost layer, is partially removed, and the barrier layer 52 is exposed.
• the barrier layer 52 of the exterior film 50 and the lid body 80 are joined by welding.
• the heat-sealable resin layer 53B which is the outermost layer of the exterior film 50, and the covering body 70 may be joined by, for example, heat sealing.
• the first sealing portion 91 is preferably formed by heat-sealing the heat-fusible resin layer 53A and the heat-fusible resin layer 53B.
• FIG. 10 is a cross-sectional view of the power storage device 10 of the second modified example.
• the outermost layer and the outermost layer of the exterior film 50 are preferably heat-sealable resin layers 53A and 53B.
• the outermost layer, the heat-sealable resin layer 53B is partially removed, and the barrier layer 52 is exposed.
• the barrier layer 52 of the exterior film 50 and the covering body 70 are bonded by welding.
• the heat-sealable resin layer 53A which is the innermost layer of the exterior film 50, and the lid body 80 may be bonded by, for example, heat sealing.
• the lid body 60 does not have to have the covering body 70.
• Fig. 11 is a cross-sectional view of the electricity storage device 10 of the third modified example.
• the lid body 80 is configured to include a metal material. In a portion of the exterior film 50 that is directly joined to the lid body 80 in the second sealing portion 92, the heat-sealable resin layer 53 may be partially removed, and the barrier layer 52 may be exposed.
• FIG. 12 is a cross-sectional view of another example of the electricity storage device 10 according to the third modified example.
• the portion of the exterior film 50 that is directly joined to the lid body 80 in the second sealing portion 92 may be a single layer of the barrier layer 52, with the base material layer 51 and the heat-sealable resin layer 53 removed.
• FIG. 13 is a cross-sectional view showing an example of a layer configuration of an exterior film 50X provided in an electricity storage device 10 according to a fourth modified example.
• the exterior film 50X is a laminate film including a first barrier layer 510, a second barrier layer 520, and an insulating layer 530.
• the first barrier layer 510, the second barrier layer 520, and the insulating layer 530 are laminated so that the first barrier layer 510 and the second barrier layer 520 are not electrically connected to each other.
• the first barrier layer 510, the insulating layer 530, and the second barrier layer 520 are laminated in this order from the outside of the exterior body 40 toward the electrode body 20.
• the first barrier layer 510 and the second barrier layer 520 are composed of a metal material.
• the first barrier layer 510 is bonded to the lid 60 connected to the positive electrode. From the viewpoint of increasing the bonding strength between the first barrier layer 510 and the lid 60 connected to the positive electrode, it is preferable that the metal material contained in the material constituting the first barrier layer 510 is the same metal material as the metal material contained in the material constituting the lid 60 connected to the positive electrode.
• the second sealing portion 92 is formed to include an end portion of the first barrier layer 510.
• the second barrier layer 520 is bonded to the lid 60 connected to the negative electrode. From the viewpoint of increasing the bonding strength between the second barrier layer 520 and the lid 60 connected to the negative electrode, it is preferable that the metal material contained in the material constituting the second barrier layer 520 is the same metal material as the metal material contained in the material constituting the lid 60 connected to the negative electrode.
• the second sealing portion 92 is formed to include an end portion of the second barrier layer 520.
• the insulating layer 530 insulates the first barrier layer 510 from the second barrier layer 520 so that the first barrier layer 510 and the second barrier layer 520 are not electrically connected to each other.
• the material constituting the insulating layer 530 can be selected arbitrarily as long as it can insulate the first barrier layer 510 from the second barrier layer 520.
• the material constituting the insulating layer 530 is, for example, a resin, an elastomer, or a ceramic.
• the ceramic is, for example, a glass, an oxide, a nitride, a carbonate, or a hydroxide.
• the material constituting the insulating layer 530 may be a combination of a plurality of materials. From the viewpoint of suitably insulating the first barrier layer 510 from the second barrier layer 520, it is preferable that the material constituting the insulating layer 530 contains an insulating filler.
• the resin may be, for example, a thermoplastic resin such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, phenolic resin, fluororesin, or modified versions of these resins. From the viewpoint of moisture barrier properties, it is preferable to use a thermoplastic resin such as a fluororesin or modified version of a fluororesin.
• the ceramic is, for example, an oxide or a nitride.
• the oxide is, for example, magnesium oxide, silicon oxide, aluminum oxide, or tin oxide. These oxides have moisture barrier properties.
• the nitride may be, for example, aluminum nitride, boron nitride, or silicon nitride. From the viewpoint of moisture barrier properties, it is preferable to use silicon nitride.
• An example of a carbonate is magnesium carbonate.
• An example of a hydroxide is magnesium hydroxide. Magnesium carbonate and magnesium hydroxide have moisture barrier properties.
• the exterior film 50 preferably includes an overlapping portion 500X, which is a portion where the first barrier layer 510, the insulating layer 530, and the second barrier layer 520 overlap in a plan view.
• an overlapping portion 500X is a portion where the first barrier layer 510, the insulating layer 530, and the second barrier layer 520 overlap in a plan view.
• the overlapping portion 500X is formed so as to cover substantially the entire upper and lower surfaces of the electrode body 20.
• the first barrier layer 510 extends in the FB direction beyond the second barrier layer 520 and the insulating layer 530 to the lid body 60 side connected to the positive electrode.
• the second barrier layer 520 extends in the FB direction further toward the lid body 60 side connected to the negative electrode than the first barrier layer 510 and the insulating layer 530. From the viewpoint of preventing a short circuit between the second barrier layer 520 and the electrode body 20, it is preferable that another insulating layer is laminated on the surface of the second barrier layer 520 opposite the surface on which the insulating layer 530 is laminated.
• the end 530X on the lid body 60 side connected to the positive electrode of the insulating layer 530 is located closer to the lid body 60 connected to the positive electrode than the end 520X on the lid body 60 side connected to the positive electrode of the second barrier layer 520.
• the end 530Y on the lid body 60 side connected to the negative electrode of the insulating layer 530 is located closer to the lid body 60Y connected to the negative electrode than the end 510Y on the lid body 60 side connected to the negative electrode of the first barrier layer 510.
• the first barrier layer 510 and the second barrier layer 520 are insulated by the insulating layer 530, so that the lid body 60 connected to the positive electrode and the lid body 60 connected to the negative electrode are not electrically connected.
• the exterior film 50 of the power storage device 10 may protrude outward from one of the two lid bodies 60 in the FB direction.
• the electrode body 20 is sealed by closing the portion of the exterior film 50 that protrudes outward from the lid body 60.
• the portion of the exterior film 50 that protrudes outward from the lid body 60 may be folded inward so that the outer surfaces of the exterior film 50 come into contact with each other, as in a Goebel-top container, or may be folded toward any surface of the exterior body 40, as in a brick container.
• the exterior body 40 may not have one of the two lid bodies 60.
• the electrode body 20 in a portion of the exterior body 40 where the lid body 60 is omitted, the electrode body 20 is sealed by closing a portion of the exterior film 50 that protrudes outward beyond the electrode body 20.
• the portion of the exterior film 50 that protrudes outward beyond the electrode body 20 may be folded like a Goebel-top container or a brick container, as in the fifth modification.
• the outer shape of the exterior body 40 can be changed as desired.
• the outer shape of the exterior body 40 may be a cylinder, a prism, or a cube.
• the electrode body 20 is wrapped in one exterior film 50 , but it may be wrapped in two or more exterior films 50 .
• Electrode body 40 Exterior body 50: Exterior film 53: Barrier layer 60: Lid body 70, 470: Cover body 80: Lid body 92: Second sealing portion (sealing portion)

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