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
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • 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
  • H01M50/116—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
  • H01M50/10—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
• • 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
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag 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
  • H01M50/30—Arrangements for facilitating escape of gases
  • H01M50/317—Re-sealable arrangements
• • 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
  • H01M50/30—Arrangements for facilitating escape of gases
  • H01M50/317—Re-sealable arrangements
  • H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
  • H01M50/333—Spring-loaded vent valves
• • 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
  • H01M50/572—Means for preventing undesired use or discharge
  • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
  • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
• • 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
  • H01M50/572—Means for preventing undesired use or discharge
  • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
  • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
  • H01M50/591—Covers
• • 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, an exterior kit, and a lid unit.
• 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 lid and the heat-fusible resin layer of the exterior film are joined by, for example, heat sealing.
• the joining strength between the lid and the exterior film is low, and the exterior body does not seal the electrode body well.
• the present invention aims to provide a highly sealed electricity storage device, an exterior film used as an exterior body for the electricity storage device, an exterior body kit including the exterior film, and a method for manufacturing the 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 contains a conductive material and seals the electrode body together with the exterior film, the exterior film having a conductive barrier layer, and the conductive barrier layer is joined to a portion of the lid that contains the conductive material.
• the electric storage device is the electric storage device according to the first aspect, in which the exterior body has a welding mark which is a trace of bonding between the conductive barrier layer and the lid body, or a trace of bonding between the conductive barrier layers of opposing surfaces of the exterior film.
• the energy storage device is the energy storage device according to the first or second aspect, in which the exterior body has a coating insulator that covers at least a portion of the exterior film.
• the fourth aspect of the present invention is an electricity storage device according to any one of the first to third aspects, in which the exterior film is composed only of the conductive barrier layer.
• the fifth aspect of the present invention relates to an electric storage device that is an electric storage device according to any one of the first to fourth aspects, and has an insulating member disposed between the conductive barrier layer and the electrode body.
• the sixth aspect of the present invention relates to an electric storage device according to any one of the first to fifth aspects, and the lid body includes a lid main body that includes the conductive material and is joined to the conductive barrier layer, a current extraction portion that includes a conductive material, and an insulating portion that insulates the lid main body from the current extraction portion.
• the seventh aspect of the present invention is an electric storage device according to any one of the first to sixth aspects, in which the exterior film has a heat-sealable resin layer partially laminated to the conductive barrier layer, and the exterior body has a first sealing portion in which the heat-sealable resin layers of the exterior film are joined together.
• the electricity storage device is an electricity storage device according to any one of the first to seventh aspects, and has a gas vent valve attached to the lid.
• the exterior film according to the ninth aspect of the present invention is an exterior film used for the exterior of an electricity storage device including an electrode body, the exterior body being composed of a conductive material and having a lid that seals the electrode body together with the exterior film, and the exterior film having a conductive barrier layer that is joined to a portion of the lid that is composed of the conductive material.
• the exterior film according to the tenth aspect of the present invention is the exterior film according to the ninth aspect, and the exterior film has a heat-sealable resin layer that is partially laminated to the conductive barrier layer.
• the exterior film according to an eleventh aspect of the present invention is an exterior film used for the exterior of an electricity storage device including an electrode body, the exterior body being composed of a conductive material and having a lid that seals the electrode body together with the exterior film, the exterior film having a conductive barrier layer that is joined to a portion of the lid that is composed of the conductive material, and the conductive barrier layer having an exposed portion.
• the exterior kit according to the twelfth aspect of the present invention includes an exterior film according to any one of the ninth to eleventh aspects and the lid.
• the method for manufacturing an electricity storage device is a method for manufacturing 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 body that contains a conductive material and seals the electrode body together with the exterior film, the exterior film having a conductive barrier layer.
• the method for manufacturing the electricity storage device includes a step of joining the conductive barrier layer to a portion of the lid body that contains the conductive material.
• the manufacturing method of the electricity storage device according to the fourteenth aspect of the present invention is the manufacturing method of the electricity storage device according to the thirteenth aspect, in which the exterior film has a base material layer laminated on the outer side of the conductive barrier layer, and the step of joining the conductive barrier layer to the part of the lid body that contains the conductive material is carried out in a state in which the base material layer is laminated on the conductive barrier layer.
• the manufacturing method of the electricity storage device is the manufacturing method of the electricity storage device according to the thirteenth aspect, in which the exterior body has a coating insulator that covers at least a portion of the exterior film, and the manufacturing method of the electricity storage device includes a step performed after the step of joining the conductive barrier layer and the portion of the lid body that contains the conductive material, the step of coating at least a portion of the exterior film with the coating insulator.
• the electricity storage device, exterior film, exterior kit, and method for manufacturing an electricity storage device according to the present invention can contribute to improving the sealing performance of the electricity storage device.
• FIG. 1 is a perspective view of an electricity storage device according to an embodiment.
• FIG. 2 is a diagram showing a state in which an exterior film provided on the electricity storage device in FIG. 1 is unfolded.
• 3 is a cross-sectional view taken along line D3-D3 in FIG. 2;
• FIG. 4 is a cross-sectional view taken along line D4-D4 in FIG. 2 .
• FIG. 2 is a perspective view of a lid provided in the electricity storage device of FIG. 1 .
• 6 is a cross-sectional view taken along line D6-D6 in FIG. 1; 4 is a flowchart showing an example of a method for manufacturing the electricity storage device of FIG. 1 .
• 8 is a diagram showing a third step of the method for manufacturing the electricity storage device in FIG.
• FIG. 11 is a cross-sectional view of an electricity accumulation device according to a first modified example.
• 14 is a cross-sectional view showing an example of a layer structure of an exterior film and a covering insulator included in the electricity storage device of FIG. 13.
• 10 is a flowchart showing an example of a manufacturing method for an electricity accumulation device according to a first modified example.
• FIG. 1 is a perspective view that shows a schematic diagram of an electric storage device 10 according to an embodiment.
• FIG. 2 is a view of an exterior film 50 provided in the electric storage device 10 of FIG. 1 in an unfolded state.
• FIG. 3 is a cross-sectional view taken along line D3-D3 in FIG. 2.
• FIG. 4 is a cross-sectional view taken along line D4-D4 in FIG. 2.
• FIG. 5 is a perspective view of a lid body 60 provided in the electric storage device 10 of FIG. 1.
• FIG. 6 is a cross-sectional view taken along line D6-D6 in FIG. 1.
• FIG. 1 is a perspective view that shows a schematic diagram of an electric storage device 10 according to an embodiment.
• FIG. 2 is a view of an exterior film 50 provided in the electric storage device 10 of FIG. 1 in an unfolded state.
• FIG. 3 is a cross-sectional view taken along line D3-D3 in FIG. 2.
• FIG. 4 is a cross-section
• 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 including a current collector 30 (see FIG. 6) 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 sodium ion 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
• 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 encases the electrode body 20.
• the exterior film 50 is wrapped around the electrode body 20.
• the lid body 60 is disposed on the side of the electrode body 20 in the FB direction.
• the electrode body 20 may be accommodated inside the exterior film 50 configured in a cylindrical shape so that openings 40A are formed at both ends in the FB direction, and the openings 40A may be closed by the lid body 60.
• the electrode body 20 connected to the lid body 60 may be accommodated inside the exterior film 50 configured in a cylindrical shape so that openings 40A are formed, and the openings 40A may be closed by the lid body 60.
• 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 exterior film 50 and the lid 60 constitute an exterior kit 60X.
• 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, for example, a laminate (laminate film) having a base layer 51 and a conductive barrier layer 52 in this order.
• the base layer 51 is a layer that is provided as needed.
• 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 substrate layer 51 includes at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer, so that the conductive 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 viewpoint of film strength, the thickness of the substrate layer 51 is preferably, for example, 5 to 300 ⁇ m, and more preferably 5 to 150 ⁇ m.
• the substrate layer 51 may be a coating layer.
• the material constituting the coating layer is, for example, an epoxy resin, a polyurethane resin, a polyimide resin, or a fluororesin.
• the conductive barrier layer 52 is a layer that at least prevents the intrusion of moisture.
• the conductive barrier layer 52 is bonded to the base layer 51, for example, via an adhesive layer 53.
• the conductive barrier layer 52 is bonded to the lid body 70 of the lid body 60, which will be described later, for example, by welding.
• the conductive barrier layer 52 is composed of a metal material.
• the metal material constituting the conductive barrier layer 52 include aluminum, aluminum alloys, titanium, titanium alloys, steel (including stainless steel), copper, copper alloys, nickel, nickel alloys, magnesium, magnesium alloys, niobium, iron, antimony-doped tin oxide, and tin-doped indium oxide.
• the metal foil preferably contains at least one of an aluminum alloy foil and a stainless steel foil.
• the metal material constituting the conductive barrier layer 52 may contain recycled metal materials.
• recycled metal materials include recycled aluminum alloys, stainless steel, titanium steel, and steel plate materials. These recycled materials can be obtained by known methods. Recycled aluminum alloy materials can be obtained by the manufacturing method described in WO 2022/092231.
• the conductive barrier layer 52 may be composed of only recycled materials, or may be composed of a mixture of recycled and virgin materials. Note that recycled metal materials refer to metal materials that have been made reusable by collecting, isolating, and refining various products used in the city and waste materials from manufacturing processes. Also, virgin metal materials refer to new metal materials that have been refined from natural metal resources (raw materials) and are not recycled materials.
• 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%.
• 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 conductive 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 conductive 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 conductive 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 conductive 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 conductive barrier layer 52 is made of aluminum alloy foil, the above-mentioned ranges are particularly preferred.
• the thickness of the conductive 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.
• Preferred 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 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 conductive 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 conductive 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 conductive 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 conductive barrier layer 52.
• the corrosion-resistant film means a film that improves the acid resistance of the conductive barrier layer 52 (acid-resistant film), a film that improves the alkali resistance of the conductive 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.
• hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved by a treatment agent to form a metal compound with excellent corrosion resistance. Note that these treatments may also be included in the definition of chemical conversion treatment.
• the corrosion-resistant coating is also included in the conductive barrier layer 52.
• the corrosion-resistant coating prevents delamination between the conductive 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 conductive 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 conductive barrier layer 52 when the conductive barrier layer 52 is an aluminum alloy foil, and improves the adhesion (wettability) of the surface of the conductive barrier layer 52, preventing delamination between the base layer 51 and the conductive barrier layer 52 during heat sealing and between the base layer 51 and the conductive barrier layer 52 during molding.
• the conductive barrier layer 52 e.g., aluminum alloy foil
• an arbitrary layer such as a heat-sealable resin layer 54 (see FIG. 4) may be laminated on the surface opposite the base layer 51.
• the heat-sealable resin layer 54 is laminated on the conductive barrier layer 52 in a predetermined range including the first edge 50A of the exterior film 50 and in a predetermined range including the second edge 50B.
• the conductive barrier layer 52 is exposed in the exterior film 50 in the portion other than the portion where the heat-sealable resin layer 54 is laminated.
• the portion indicated by the dots in FIG. 2 is an example of the range where the heat-sealable resin layer 54 is laminated.
• the heat-sealable resin layer 54 is bonded to the conductive barrier layer 52, for example, via an adhesive layer 55.
• the heat-sealable resin layer 54 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 54 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 54 is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 preferably has one or more layers with a buffer function (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 54, more preferably outside the conductive 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 conductive 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 buffer layer thickness is preferably 0.5 mm, and more preferably 1.0 mm.
• the upper limit of the buffer layer thickness is preferably 10 mm, and more preferably 5.0 mm, and more preferably 2.0 mm.
• the preferred ranges of the buffer layer thickness are 1.0 mm to 2.0 mm, 1.0 mm to 5.0 mm, 1.0 mm to 10 mm, 0.5 mm to 2.0 mm, 0.5 mm to 5.0 mm, and 0.5 mm to 10 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 seals the electrode body 20 together with the exterior film 50.
• the lid body 60 has a lid main body 70, a current extraction section 80, and an insulating section 90.
• the lid body 70 and the current extraction section 80 are composed of a conductive material.
• “Composed of a conductive material” means that, when the entire material constituting the lid body 70 or the current extraction section 80 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 70 and the current extraction section 80 can contain materials other than the conductive material in addition to the conductive material.
• At least one of the lid body 70 and the current extraction section 80 composed of a conductive material preferably has the corrosion-resistant coating described for the conductive barrier layer 52.
• the conductive material constituting the lid body 70 and the current extraction section 80 is, for example, a metal material.
• the metal material constituting the lid body 70 and the current extraction section 80 is, for example, aluminum, an aluminum alloy, nickel, copper, or a copper alloy. From the viewpoint of increasing the bonding strength between the lid body 70 and the conductive barrier layer 52 of the exterior film 50, it is preferable that the conductive material constituting the lid body 70 and the metal material constituting the conductive barrier layer 52 of the exterior film 50 are the same material.
• the conductive material constituting the current extraction section 80 may be the same as the conductive material constituting the lid body 70, or may be different.
• the current extraction section 80 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the current extraction section 80 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material constituting the current extraction section 80 connected to the negative electrode may be nickel-plated copper.
• the material constituting the current extraction section 80 may include recycled metal materials.
• the lid body 70 is, for example, plate-shaped and has a first surface 71, a second surface 72, a film joint 73, and a through hole 70X.
• the first surface 71 faces the electrode body 20.
• the end 31 (see FIG. 6) of the current collector 30 is, for example, joined to the first surface 71.
• the second surface 72 is the surface opposite the first surface 71.
• the film joint 73 is connected to the first surface 71 and the second surface 72, and is joined to the conductive barrier layer 52 of the exterior film 50.
• the film joint 73 includes a first joint surface 73A, a second joint surface 73B, a third joint surface 73C, and a fourth joint surface 73D.
• the first joint surface 73A constitutes the upper surface of the lid body 60.
• the first joint surface 73A extends in a first direction (in this embodiment, the LR direction) in a front view of the lid body 60.
• the second joint surface 73B and the third joint surface 73C are connected to the first joint surface 73A and constitute the side surface of the lid body 60.
• the second joint surface 73B and the third joint surface 73C extend in a second direction (in this embodiment, the UD direction) that intersects with the first direction in a front view of the lid body 60.
• the first direction and the second direction are perpendicular to each other in a front view of the lid body 60.
• the first direction and the second direction do not have to be perpendicular to each other when viewed from the front of the lid 60.
• the fourth joint surface 73D forms the lower surface of the lid 60.
• the fourth joint surface 73D extends in the first direction (the LR direction in this embodiment) when viewed from the front of the lid 60.
• the film joint 73 of the lid body 60 has a certain thickness in the FB direction 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 film joint 73 has a certain thickness in the FB direction so that the film joint 73 and the conductive barrier layer 52 of the exterior film 50 can be suitably joined when forming the second sealing portion 120 described later.
• the minimum value of the thickness of the film joint 73 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 film joint 73 in the FB direction is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm.
• the maximum value of the thickness of the film joint 73 in the FB direction may be 20 mm or more.
• Preferred ranges for the thickness of the film joint 73 in the FB direction 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 film joint 73 may vary depending on the location of the lid body 70. When the thickness of the film joint 73 varies depending on the location, the thickness of the film joint 73 is the thickness of the thickest part.
• the film joint portion 73 further includes boundaries 74, 75, 76, and 77.
• Boundary 74 is the boundary between the first joint surface 73A and the second joint surface 73B.
• Boundary 75 is the boundary between the first joint surface 73A and the third joint surface 73C.
• Boundary 76 is the boundary between the fourth joint surface 73D and the second joint surface 73B.
• Boundary 77 is the boundary between the fourth joint surface 73D and the third joint surface 73C.
• the shapes of the boundaries 74 to 77 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 74 to 77 are corners.
• the through hole 70X is formed approximately in the center of the lid body 70.
• the through hole 70X penetrates the first surface 71 and the second surface 72 of the lid body 70.
• the shape of the through hole 70X when viewed from the front or rear of the lid body 60 can be selected as desired. In the example shown in FIG. 5, the shape of the through hole 70X when viewed from the front or rear of the lid body 60 is rectangular.
• the shape of the through hole 70X when viewed from the front or rear of the lid body 60 may be a square, circle, ellipse, triangle, or polygon with pentagons or more sides.
• the current extraction section 80 is an element that outputs a current, and is connected to, for example, an external device.
• the shape of the current extraction section 80 can be selected arbitrarily.
• the current extraction section 80 is a rectangular block shape. At least a portion of the current extraction section 80 is housed in the through hole 70X. In this embodiment, the entire current extraction section 80 is housed in the through hole 70X.
• the current extraction section 80 may protrude to the outside of the lid body 70 from at least one of the first surface 71 and the second surface 72 of the lid body 70.
• the insulating portion 90 insulates the lid body 70 and the current extraction portion 80. Therefore, even when the conductive barrier layer 52 and the lid body 70 of a pair of lid bodies 60 are joined, the current extraction portion 80 of one lid body 60 and the current extraction portion 80 of the other lid body 60 are not electrically connected.
• the material constituting the insulating portion 90 can be selected arbitrarily as long as it is a material that can insulate the lid body 70 and the current extraction portion 80.
• the material constituting the insulating portion 90 is, for example, rubber, a resin material, ceramic, or glass.
• the insulating portion 90 is arranged so as to fill the gap between the current extraction portion 80 and the inner surface of the through hole 70X.
• an insulating member 100 is disposed inside the exterior body 40, at least partially between the conductive barrier layer 52 and the electrode body 20.
• the insulating member 100 is disposed so as to face substantially the entire conductive barrier layer 52.
• the insulating member 100 is, for example, a film or an insulating coating.
• the insulating member 100 may or may not be bonded to the conductive barrier layer 52.
• the first sealing portion 110 is formed by heat sealing the opposing surfaces (thermally adhesive resin layer 54) of the exterior film 50 wrapped around the electrode body 20. If the exterior film 50 does not have a thermally adhesive resin layer 54, the first sealing portion 110 may be formed by joining the conductive barrier layers 52 of the opposing surfaces of the exterior film 50, for example, by welding.
• the first sealed portion 110 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. 2.
• the first sealed portion 110 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position at which the first sealed portion 110 is formed in the exterior body 40 can be selected arbitrarily.
• the root 110X of the first sealed portion 110 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 110X of the first sealed portion 110 may be located on any surface of the exterior body 40.
• the first sealed portion 110 protrudes outward from the electrode body 20 in a plan view.
• the first sealed portion 110 may be folded, for example, toward the second surface 42A of the exterior body 40, or toward the first surface 41A.
• the second sealing portion 120 is formed by joining the conductive barrier layer 52 of the exterior film 50 and the film joint portion 73 of the lid body 60.
• the conductive barrier layer 52 of the exterior film 50 and the film joint portion 73 are joined by, for example, welding, in a typical example, at least a part of the base material layer 51 and the adhesive layer 53 of the exterior film 50 located on the film joint portion 73 melts. For this reason, the welding marks 40X are confirmed on the exterior film 50 located on the film joint portion 73.
• the first sealing portion 110 is formed by joining the conductive barrier layers 52 of the exterior film 50 facing each other by welding, the welding marks 40X may also be confirmed on the first sealing portion 110. Note that FIG.
• FIG. 6 shows an example in which the base material layer 51 and the adhesive layer 53 of the exterior film 50 located on the film joint portion 73 are entirely melted, but the base material layer 51 and the adhesive layer 53 of the exterior film 50 located on the film joint portion 73 may also be partially melted. Depending on the welding method, at least a portion of the base material layer 51 and adhesive layer 53 of the exterior film 50 located on the film joint 73 may remain.
• the conductive barrier layer 52 of the exterior film 50 and the film joint 73 are joined by welding, the time required for joining can be shorter than when the exterior film 50 and the lid body 70 are joined by heat sealing via an adhesive film, for example.
• 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, and an eighth step.
• the first step to the eighth 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 eighth step may be performed by an operator.
• the first step to the eighth step are names of the steps in the method for manufacturing the power storage device 10 for convenience, and do not necessarily mean the order of the steps. The order of the following steps can be changed arbitrarily as long as there is no technical contradiction.
• the manufacturing device places a pair of lid bodies 60 on the sides of the electrode body 20 in the FB direction, and electrically connects the current collector 30 and the current extraction section 80.
• the second step of step S2 is performed after the first step.
• the manufacturing device wraps the electrode body 20 and the lid body 60 with the exterior film 50.
• an exterior film 50 having a larger area than the exterior film 50 of the finished electricity storage device 10 is used.
• the manufacturing device winds the exterior film 50 around the electrode body 20 and the lid body 60 while tension is applied to the exterior film 50, while restricting the movement of the electrode body 20 and the lid body 60 with the restricting means.
• the restricting means is, for example, a groove into which the electrode body 20 and the lid body 60 are fitted.
• the restricting means may be a device that applies an external force to the electrode body 20 and the lid body 60 so that the electrode body 20 and the lid body 60 do not move.
• the restricting means may be a device that applies a force to the electrode body 20 and the lid body 60 in the opposite direction to the direction in which the exterior film 50 is pulled.
• the regulating means may include a roller that runs on the exterior film 50 while the exterior film 50 is being pulled in order to remove wrinkles in the exterior film 50.
• the electrode body 20 may be housed inside the exterior film 50 that is configured in a cylindrical shape so that the openings 40A are formed at both ends in the FB direction, and the openings 40A may be closed by the lid 60 after the current collector 30 and the current extraction section 80 are joined.
• the electrode body 20 connected to the current extraction section 80 of the lid 60 may be housed inside the exterior film 50 that is configured in a cylindrical shape so that the openings 40A are formed at both ends in the FB direction, and the openings 40A may be closed by the lid 60.
• the third step of step S3 is performed after the second step.
• the manufacturing device forms a first FB-direction joint 111 having an unjoined portion 110Z in the center. Note that the shaded area in FIG. 8 shows an example of the area where the first FB-direction joint 111 is formed.
• the fourth step of step S4 is performed after the third step.
• the manufacturing equipment forms a second short side joint 121.
• the second short side joint 121 is a portion where the second joint surface 73B and the third joint surface 73C of the lid body 70 are joined to the conductive barrier layer 52 of the exterior film 50.
• the hatched portion in FIG. 9 shows an example of the area where the second short side joint 121 is formed.
• the fifth step of step S5 is performed after the fourth step.
• the manufacturing equipment forms the second long side joint 122.
• the second long side joint 122 is a portion where the first joint surface 73A and the fourth joint surface 73D of the lid body 70 are joined to the conductive barrier layer 52 of the exterior film 50.
• the shaded portion in FIG. 10 shows an example of the region where the second long side joint 122 is formed.
• the fourth and fifth steps may be performed simultaneously.
• the sixth step of step S6 is performed after the fifth step.
• the manufacturing equipment forms the first LR direction joint 112.
• the first LR direction joint 112 is formed so as to overlap partially with the first FB direction joint 111 in the portion including the side 43. Note that the shaded portion in FIG. 11 shows an example of the region where the first LR direction joint 112 is formed.
• Completion of the sixth step results in a gas pocket 300 having a larger area in a plan view than the first sealing portion 110 of the finished power storage device 10.
• the seventh step of step S7 is performed after the sixth step.
• the manufacturing device injects an electrolyte through the opening of the gas pocket 300.
• the gas pocket 300 is bonded at the edges including the opening to form a pocket sealing portion 310.
• the aging step is performed after the seventh step. Gas generated by the aging step is stored in the gas pocket 300.
• the gas stored in the gas pocket 300 is discharged through an opening formed by cutting a part of the gas pocket 300.
• the gas pocket 300 is cut, for example, along the dashed line XA shown in FIG. 12 to form an opening for discharging the gas.
• step S8 is performed after the seventh step and after the aging step is completed.
• the manufacturing device forms the first sealing portion 110.
• the first FB direction joint portion 111 may or may not be rejoined.
• the conductive barrier layer 52 of the exterior film 50 and the lid main body 70 which is a portion of the lid body 60 that contains a conductive material, are joined together, and thus the joining strength is high. Therefore, the electricity storage device 10 has high sealing performance.
• the above-mentioned embodiments are examples of possible forms of the electricity storage device, exterior film, exterior kit, 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, exterior kit, and 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. The following modified examples can be combined with each other as long as there is no technical contradiction.
• First modified example> 13 is a cross-sectional view of the electricity storage device 10 of the first modified example.
• the exterior film 50 may be composed of only the conductive barrier layer 52.
• the exterior film 50 is preferably covered with a coating insulator 150.
• the exterior film 50 and the coating insulator 150 are separate members. The coating insulator 150 is preferably joined to the conductive barrier layer 52 of the exterior film 50.
• the specific configuration of the covering insulator 150 can be selected arbitrarily as long as it can insulate the conductive barrier layer 52 from the outside of the exterior body 40.
• the covering insulator 150 may be a laminate film in which a first layer 151, a second layer 152, and a third layer 153 are laminated from the outside.
• the material constituting the first layer 151 and the third layer 153 is, for example, polypropylene.
• the material constituting the second layer 152 is, for example, polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate. It is preferable that the second layer 152 is subjected to a surface treatment such as ozone treatment or anchor coat treatment.
• the covering insulator 150 may be an insulating tape.
• the conductive barrier layer 52 of the exterior film 50 and the film joint 73 of the lid body 70 are joined together, and then the exterior film 50 is covered with the covering insulator 150.
• the conductive barrier layer 52 of the exterior film 50 and the film joint 73 of the lid body 70 are joined together, for example, by welding, the weld mark 40Y is confirmed in the conductive barrier layer 52 located on the film joint 73 of the exterior film 50.
• the covering insulator 150 covers the exterior film 50 so as to cover at least the weld mark 40Y.
• the covering insulator 150 covers the exterior film 50 so as to cover at least the weld mark 40Y, for example, the weld mark 40Y can be confirmed by peeling the covering insulator 150 from the exterior film 50.
• gas may be generated inside the exterior body 40.
• gas such as volatile organic solvent, carbon monoxide, carbon dioxide, methane, ethane, hydrogen, and hydrogen fluoride may be generated inside the exterior body 40 due to the evaporation of the organic solvent of the electrolyte and the decomposition of the electrolyte.
• the electricity storage device 10 is a capacitor
• gas may be generated inside the exterior body 40 due to a chemical reaction in the capacitor.
• the electrode body 20 may contain a solid electrolyte that can generate gas.
• the solid electrolyte is a sulfide-based electrolyte
• hydrogen sulfide gas may be generated.
• the internal pressure of the exterior body 40 increases. For this reason, it is preferable that the gas generated inside the exterior body 40 can be discharged to the outside of the exterior body 40.
• gas is generated from the electrode body 20 in the aging process, it is preferable that the generated gas be discharged to the outside of the exterior body 40.
• the power storage device 10 of the first modified example may be provided with a gas vent valve 200 so that gas generated inside the exterior body 40 can be discharged to the outside of the exterior body 40.
• the gas vent valve 200 may be a known valve-type check valve that allows repeated gas release, such as a ball spring type, poppet type, duckbill type, umbrella type, or diaphragm type.
• the gas vent valve 200 may be a break valve.
• the gas vent valve 200 comprises a housing 210, a valve mechanism 220, and an attachment portion 230.
• the housing 210 is made of, for example, metal or resin.
• the housing 210 is, for example, cylindrical in shape, and houses the valve mechanism 220 therein.
• An outlet 210A for discharging gas is formed on the end face of the housing 210 opposite the attachment portion 230.
• the valve mechanism 220 has a spring, a valve body, and a valve seat. That is, in this embodiment, the gas vent valve 200 is a ball spring type check valve.
• the mounting portion 230 is connected to the housing 210.
• the mounting portion 230 is made of metal or resin.
• the mounting portion 230 may be integrally formed with the housing 210, or may be formed separately from the housing 210 and joined to the housing 210.
• the end face of the mounting portion 230 opposite the housing 210 has an inlet 230A that faces the inside of the exterior body 40.
• the valve mechanism 220 opens.
• the valve mechanism 220 opens, the gas passes through the inlet 230A, the inside of the mounting portion 230, the inside of the housing 210, and the outlet 210A, in that order, before being discharged to the outside.
• the gas vent valve 200 is attached to the lid body 70.
• the attachment portion 230 of the gas vent valve 200 is inserted, for example, into a hole 70Y formed in the lid body 70.
• the mounting portion 230 of the gas vent valve 200 is at least partially embedded inside the lid body 70. At least a portion of the housing 210 may be embedded inside the lid body 70.
• the position of the inlet 230A of the mounting portion 230 can be selected arbitrarily.
• the inlet 230A may be located on the first surface 71 of the lid body 70, may be located closer to the electrode body 20 than the first surface 71 of the lid body 70, or may be located inside the lid body 70. From the viewpoint of suppressing interference between the gas vent valve 200 and the electrode body 20, it is preferable that the inlet 230A is as far away from the electrode body 20 as possible. In the example shown in FIG. 13, the inlet 230A is located on the first surface 71 of the lid body 70.
• a hole 70Z for injecting the electrolyte is formed in the lid body 60.
• the hole 70Z is formed in the lid main body 70.
• the hole 70Z is closed, for example, by a resin material or the like.
• FIG. 15 is a flow chart showing an example of a method for manufacturing the power storage device 10 of the first modified example.
• the method for manufacturing the power storage device 10 includes, for example, an eleventh step, a twelfth step, a thirteenth step, a fourteenth step, a fifteenth step, and a sixteenth step.
• the eleventh step to the sixteenth step are performed, for example, by a manufacturing device for the power storage device 10. At least a part of the eleventh step to the sixteenth step may be performed by an operator.
• the eleventh step to the sixteenth step are merely names for the steps in the method for manufacturing the power storage device 10 of the first modified example, and do not necessarily refer to the order of the steps. The order of the following steps can be changed as desired as long as there is no technical contradiction.
• the manufacturing device places a pair of lid bodies 60 on the sides of the electrode body 20 in the FB direction, and electrically connects the current collector 30 and the current extraction section 80.
• a gas vent valve 200 is attached to one of the pair of lid bodies 60.
• the gas vent valve 200 may be attached to both lid bodies 60.
• the twelfth step of step S12 is carried out after the eleventh step.
• the manufacturing equipment wraps the electrode body 20 and the lid body 60 in an exterior film 50.
• the gas generated in the aging step is discharged by the gas vent valve 200, so there is no need to form a gas pocket 300.
• an exterior film 50 with substantially the same area as the exterior film 50 of the finished electricity storage device 10 is used.
• the manufacturing apparatus wraps the exterior film 50 around the electrode body 20 and the lid body 60 while tension is applied to the exterior film 50, while restricting the movement of the electrode body 20 and the lid body 60 with the restricting means.
• the restricting means is, for example, a groove into which the electrode body 20 and the lid body 60 are fitted.
• the restricting means may be a device that applies an external force to the electrode body 20 and the lid body 60 so as to prevent the electrode body 20 and the lid body 60 from moving.
• the restricting means may be a device that applies a force to the electrode body 20 and the lid body 60 in the opposite direction to the direction in which the exterior film 50 is pulled.
• the restricting means may include a roller that runs over the exterior film 50 while the exterior film 50 is being pulled in order to remove wrinkles in the exterior film 50.
• the electrode body 20 may be housed inside the exterior film 50 that is cylindrically configured so that the openings 40A are formed at both ends in the FB direction, and after the current collector 30 and the current extraction section 80 are joined, the openings 40A may be closed by the lid 60.
• the electrode body 20 connected to the current extraction section 80 of the lid 60 may be housed inside the exterior film 50 that is cylindrically configured so that the openings 40A are formed at both ends in the FB direction, and the openings 40A may be closed by the lid 60.
• the thirteenth step of step S13 is carried out after the twelfth step.
• the manufacturing device joins the conductive barrier layer 52 of the exterior film 50 and the film joint 73 of the lid body 70, for example, by welding.
• a weld mark 40X is formed on at least a portion of the conductive barrier layer 52 located on the film joint 73 of the exterior film 50.
• step S14 The 14th step of step S14 is carried out before or after the 13th step.
• the manufacturing device forms the first sealing portion 110 by bonding the opposing conductive barrier layers 52 of the exterior film 50 together.
• step S15 The fifteenth step of step S15 is performed after the fourteenth step.
• the manufacturing device bonds the insulating coating 150 and the exterior film 50.
• the 16th step of step S16 is carried out before or after the 15th step.
• the manufacturing device injects an electrolyte through the hole 70Z of the lid body 70.
• an aging step is carried out. Gas generated during the aging step is discharged to the outside via the gas vent valve 200.
• the electricity storage device 10 of the first modified example has the following advantages in addition to the advantages obtained by the electricity storage device 10 of the embodiment. Since the electricity storage device 10 of the first modified example is provided with the gas vent valve 200, the gas generated in the aging process is discharged through the gas vent valve 200. Therefore, in the electricity storage device 10 of the first modified example, it is not necessary to form a gas pocket to store the gas generated in the aging process. The electricity storage device 10 of the first modified example can reduce manufacturing costs because less of the exterior film 50 is discarded.
• the exterior film 50 of the power storage device 10 may protrude outward from at least 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 type container, or may be folded toward any surface of the exterior body 40, as in a brick type container.
• the length of the current extraction portion 80 in the FB direction is preferably such that it is exposed from the portion of the exterior film 50 that protrudes outward from the lid body 60.
• 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 second modified example.
• 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 40X, 40Y: Welding marks 50: Exterior film 51: Base material layer 52: Conductive barrier layer 54: Thermally adhesive resin layer 60: Lid body 60X: Exterior body kit 70: Lid body 80: Current extraction section 90: Insulating section 100: Insulating member 110: First sealing section 150: Cover insulator 200: Gas vent valve

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