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
  • H01G11/74—Terminals, e.g. extensions of current collectors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/04—Construction or manufacture in general
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • 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
  • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
  • H01M50/133—Thickness
• • 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
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
  • H01M50/183—Sealing members
  • H01M50/186—Sealing members characterised by the disposition of the sealing members
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/186—Sealing members characterised by the disposition of the sealing members
  • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/543—Terminals
  • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
  • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
• • 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
  • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
• • 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
  • H01M50/593—Spacers; Insulating plates
• • 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 a lid, an electricity storage device, a lid unit, an electrode terminal unit, 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, an electrode terminal connected to the electrode body, and an exterior body that seals the electrode body.
• the exterior body has an exterior film that encases the electrode body, and a lid that is joined to the exterior film.
• the lid body has a through-hole through which the electrode terminal is inserted.
• the present invention aims to provide a lid, an electricity storage device, a lid unit, an electrode terminal unit, and a method for manufacturing an electricity storage device that can prevent at least one of moisture and gas from entering the interior of the electricity storage device.
• the lid according to a first aspect of the present invention is a lid used for the exterior of an electricity storage device, and comprises a lid main body, a through-hole penetrating the lid main body, an insulating member including an in-hole portion disposed within the through-hole, and an out-hole portion connected to the in-hole portion and disposed outside the through-hole, and a barrier member covering at least a portion of the out-hole portion of the insulating member, wherein the barrier member has at least one of higher moisture barrier properties and gas barrier properties than the insulating member.
• a lid body according to a second aspect of the present invention is the lid body according to the first aspect, wherein the barrier member is formed integrally with the lid body.
• the lid body according to a third aspect of the present invention is the lid body according to the first aspect, wherein the barrier member is configured as a separate body from the lid body.
• a lid according to a fourth aspect of the present invention is a lid according to any one of the first to third aspects, wherein the barrier member covers at least the end of the outer hole portion facing the through-hole.
• a lid body according to a fifth aspect of the present invention is a lid body according to any one of the first to fourth aspects, wherein the lid body is constructed to include a conductive material, the barrier member has an end opposite the through-hole in a portion covering at least a portion of the outer-hole portion inside the power storage device, and the end of the barrier member is insulated.
• a lid unit is a lid unit used in the exterior of an electricity storage device, and includes a lid and a barrier member.
• the lid has a lid main body with a through hole formed therein.
• the barrier member is configured to cover at least a portion of the portion of the insulating member exposed through the through hole, and has at least one of moisture barrier properties and gas barrier properties that are higher than those of the insulating member.
• the lid body according to an eighth aspect of the present invention is a lid body used as an exterior body for an electricity storage device, and comprises a lid main body containing a conductive material, a through hole penetrating the lid main body, and an insulating member disposed within the through hole, and the thickness of the lid main body is 1.0 mm or more.
• the electrode terminal unit according to a ninth aspect of the present invention is an electrode terminal unit attached to a lid used in the exterior of an electricity storage device, and comprises a terminal body, an insulating member joined to the terminal body, and a barrier member covering at least a portion of the insulating member, wherein the barrier member has at least one of higher moisture barrier properties and gas barrier properties than the insulating member.
• a tenth aspect of the present invention relates to a method for manufacturing an electric storage device, which includes an electrode assembly and an exterior body sealing the electrode assembly.
• the exterior body includes an exterior film that wraps the electrode assembly and a lid that, together with the exterior film, seals the electrode assembly.
• the lid body includes a lid body, a through-hole penetrating the lid body, an insulating member including an in-hole portion disposed in the through-hole and an out-hole portion connected to the in-hole portion and disposed outside the through-hole, and a barrier member that covers at least a portion of the out-hole portion of the insulating member.
• the barrier member has at least one of higher moisture barrier properties and gas barrier properties than the insulating member.
• the method for manufacturing an electric storage device includes a step of placing the lid body on the electrode assembly.
• a 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 body that seals the electrode body together with the exterior film, the lid body comprising a lid body containing a conductive material, a through hole that penetrates the lid body, and an insulating member that is placed in the through hole, the lid body having a thickness of 1.0 mm or more.
• the manufacturing method for the electricity storage device includes a step of placing the lid body on the electrode body.
• the lid, electricity storage device, lid unit, electrode terminal unit, and method for manufacturing an electricity storage device according to the present invention can prevent at least one of moisture and gas from entering the interior of the electricity storage device.
• FIG. 1 is a perspective view of an electricity storage device according to an embodiment.
• 1B is a diagram showing a method for measuring the seal strength of the second sealing portion of the electricity storage device of FIG. 1A.
• FIG. 1B is a cross-sectional view showing the layer structure of an exterior film included in the electricity storage device of FIG. 1A.
• FIG. 1B is a diagram showing a state in which an exterior film provided on the electricity storage device of FIG. 1A is unfolded.
• FIG. 1B is a perspective view of the front side of a lid provided in the electricity storage device of FIG. 1A.
• FIG. 1B is a perspective view of the rear side of a lid provided in the electricity storage device of FIG. 1A.
• FIG. 10 is a cross-sectional view of a lid according to a first modified example.
• FIG. 10 is a cross-sectional view of a lid according to a second modified example.
• FIG. 10 is a cross-sectional view of a lid according to a third modified example.
• FIG. 10 is a cross-sectional view of a lid according to a fourth modified example.
• FIG. 1A is a perspective view schematically illustrating an electricity storage device 10 according to an embodiment.
• FIG. 1B is a diagram illustrating a method for measuring the seal strength of a second sealed portion 100B of the electricity storage device 10 of FIG. 1A.
• FIG. 2 is a cross-sectional view illustrating the layer structure of an exterior film 50 included in the electricity storage device 10 of FIG. 1A.
• FIG. 3 is a diagram illustrating the exterior film 50 included in the electricity storage device 10 of FIG. 1A in an unfolded state.
• FIG. 4 is a perspective view of the rear side of a lid body 60 included in the electricity storage device 10 of FIG. 1A.
• FIG. 5 is a perspective view of the front side of the lid body 60 of FIG. 4.
• FIG. 6 is a cross-sectional view taken along line D6-D6 in FIG. 1A.
• FIG. 7 is a cross-sectional view taken along line D7-D7 in FIG. 1A.
• the direction of arrow UD indicates the thickness direction of the electricity storage device 10
• the direction of arrow LR indicates the width direction of the electricity storage device 10
• the direction of arrow FB indicates the depth direction of the electricity storage device 10.
• the directions indicated by the arrows UDLRFB are the same in the subsequent drawings.
• the energy storage device 10 comprises an electrode body 20, an electrode terminal unit 30, and an exterior body 40.
• the electrode body 20 includes electrodes (positive and negative electrodes) and a separator that constitute an energy storage component such as a lithium-ion battery, capacitor, all-solid-state battery, semi-solid battery, quasi-solid battery, polymer battery, all-resin battery, lead-acid battery, nickel-metal hydride battery, nickel-cadmium battery, nickel-iron battery, nickel-zinc battery, silver oxide-zinc battery, metal-air battery, polyvalent cation battery, or capacitor.
• the shape of the electrode body 20 is approximately rectangular.
• approximately rectangular includes not only a perfect rectangular prism, but also a solid that can be considered a rectangular prism by modifying the shape of a portion of its outer surface, for example.
• the shape of the electrode body 20 may be, for example, a cylinder or polygonal prism.
• the energy storage device 10 includes two electrode terminal units 30.
• the electrode terminal unit 30 includes a terminal body 31, an insulating member 32, and a barrier member 33.
• the terminal body 31 is a metal terminal used for inputting and outputting power to and from the electrode body 20.
• the shape of the terminal body 31 can be selected arbitrarily. In the example shown in FIG. 1A, etc., the shape of the terminal body 31 is cylindrical. The shape of the terminal body 31 may also be a rectangular pillar or plate.
• One end of the terminal body 31 is electrically connected to the electrode (positive electrode or negative electrode) included in the electrode body 20. The other end of the terminal body 31 protrudes outward from, for example, an edge of the outer casing 40.
• the terminal body 31 only needs to be capable of inputting and outputting power to and from the electrode body 20, and does not, for example, need not protrude from the outer casing 40.
• the lid body 60 described below is made of a conductive material, the lid body 60 may also function as the terminal body 31. In this case, the lid body 60, which functions as the terminal body, may or may not protrude from the exterior body 40.
• the metal material constituting the terminal body 31 is, for example, aluminum, nickel, or copper.
• the terminal body 31 connected to the positive electrode is typically made of aluminum
• the terminal body 31 connected to the negative electrode is typically made of copper, nickel, or the like.
• the outermost layer of the electrode body 20 does not necessarily have to be an electrode, and may be, for example, a protective tape or a separator.
• the insulating member 32 covers part of the surface of the terminal body 31.
• the barrier member 33 covers at least part of the insulating member 32. Details of the insulating member 32 and the barrier member 33 will be described later.
• the exterior body 40 seals the electrode body 20.
• the exterior body 40 has an exterior film 50 and a lid body 60.
• the exterior film 50 wraps 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 housed inside an exterior film 50 configured in a cylindrical shape so that openings are formed at both ends in the FB direction, and the openings may be closed by the lid body 60.
• the electrode body 20 connected to the lid body 60 may be housed inside an exterior film 50 configured in a cylindrical shape so that openings are formed, and the openings may be closed by the lid body 60.
• one method involves cold-forming the exterior film 50 to form a storage section (recess) for accommodating the electrode body 20.
• a deep storage section using this method.
• Attempting to form a deep storage section (recess) using cold-forming e.g., a molding depth of 15 mm
• the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, making it easy to seal the electrode body 20 regardless of its thickness.
• the exterior film 50 is wrapped so that it is in contact with the outer surface of the electrode body 20. Furthermore, in all-solid-state batteries, it is necessary to apply high pressure uniformly from the outer surface of the battery to maximize battery performance. Therefore, it is necessary to eliminate the space between the electrode body 20 and the exterior film 50. Therefore, it is preferable for the exterior film 50 to be wrapped so that it is in contact with the outer surface of the electrode body 20.
• the exterior film 50 is a laminate (laminate film) having, for example, a base material layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order. It is not necessary for the exterior film 50 to include all of these layers; for example, it may not include the barrier layer 52. That is, the exterior film 50 may be made of any flexible, easily bendable material, such as a resin film. It is preferable that the exterior film 50 be heat-sealable. The innermost and outermost layers of the exterior film 50 may be heat-sealable resin layers 53. In this case, the exterior film 50 may encase the electrode body 20 and the lid body 60 by joining the outermost and innermost layers.
• the exterior film 50 may be composed of a laminate having at least a barrier layer 52 and a heat-sealable resin layer 53 in this order.
• the base layer 51 is an optional layer
• the side of the barrier layer 52 opposite the heat-sealable resin layer 53 is the outermost layer
• the heat-sealable resin layer 53 is the innermost layer.
• the overall thickness of the exterior film 50 can be selected as desired. From the perspective of strength, the thickness of the exterior film 50 is preferably 50 ⁇ m or more. From the perspective 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 provides heat resistance to the exterior film 50 and prevents pinholes from forming during processing or distribution.
• the substrate layer 51 may be 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, preventing breakage of the exterior film 50.
• 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 also 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 substrate layer 51 is preferably 5 to 300 ⁇ m, and more preferably 5 to 150 ⁇ m.
• the barrier layer 52 is a layer that prevents at least moisture penetration.
• 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 films, and resin layers with barrier properties.
• Vapor deposition films include metal vapor deposition films, inorganic oxide vapor deposition films, and carbon-containing inorganic oxide vapor deposition films.
• Resin layers include fluorine-containing resins such as polyvinylidene chloride, polymers based on chlorotrifluoroethylene (CTFE), polymers based on tetrafluoroethylene (TFE), polymers containing fluoroalkyl groups, and polymers based on fluoroalkyl units, as well as ethylene-vinyl alcohol copolymers.
• the barrier layer 52 can also be a resin film comprising at least one of these vapor deposition films and resin layers.
• the barrier layer 52 may be formed of multiple layers. It is preferable that the barrier layer 52 include a layer made of a metal material. Specific examples of metal materials that make up the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates. When used as a metal foil, it is preferable that the material contains at least one of aluminum alloy foil and stainless steel foil.
• layers made of the aforementioned metallic materials may contain recycled metallic materials.
• recycled metallic materials include recycled aluminum alloys, stainless steel, titanium steel, and steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloys can be obtained, for example, by the manufacturing method described in WO 2022/092231.
• the barrier layer 52 may be made entirely of recycled materials, or may be made of a mixture of recycled and virgin materials. Note that recycled metallic materials refer to metallic materials that have been made reusable by collecting, isolating, and refining various products used in the market or waste from manufacturing processes. Furthermore, virgin metallic materials refer to new metallic materials refined from natural metallic resources (raw materials) and are not recycled materials.
• the aluminum alloy foil be a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of further improving formability or conformability, it is preferable that the aluminum alloy foil be an iron-containing aluminum alloy foil.
• the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass.
• an exterior film 50 with better formability can be obtained.
• an exterior film 50 with better flexibility can be obtained.
• soft aluminum alloy foils examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, and the like may also be added as needed. Softening can be achieved by annealing or other methods. From the perspective of improving the mechanical strength of the exterior film 50, it is more preferable that the aluminum alloy foil be a hard aluminum alloy foil made of, for example, a work-hardened aluminum alloy.
• Examples of hard aluminum alloy foils 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.
• the aluminum alloy foil is also preferably an aluminum alloy foil containing manganese.
• the manganese content is preferably 0.3 to 1.5% by mass, and more preferably 1.0 to 1.5% by mass.
• Examples of aluminum alloy foils containing manganese include aluminum alloy foils having compositions specified in JIS H4000:2017 A3003P-O, JIS H4000:2017 A3103P-O, JIS H4000:2017 A3004P-O, and JIS H4000:2017 A3104P-O.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. Furthermore, from the perspective of providing an exterior film 50 with excellent formability, it is preferable that the stainless steel foil be made of austenitic stainless steel.
• austenitic stainless steels that can be used to make the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.
• the thickness of the barrier layer 52 should be sufficient to at least function as a barrier layer that prevents moisture penetration, and can be, for example, approximately 5 to 1000 ⁇ m.
• the thickness of the barrier layer 52 is preferably approximately 85 ⁇ m or less, more preferably approximately 50 ⁇ m or less, even more preferably approximately 40 ⁇ m or less, and particularly preferably approximately 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably approximately 9.0 ⁇ m or more, even more preferably approximately 20 ⁇ m or more, and more preferably approximately 25 ⁇ m or more.
• Preferred ranges for 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 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.
• Preferred ranges are approximately 35 to 200 ⁇ m, approximately 35 to 85 ⁇ m, approximately 35 to 75 ⁇ m, approximately 35 to 70 ⁇ m, approximately 45 to 200 ⁇ m, approximately 45 to 85 ⁇ m, approximately 45 to 75 ⁇ m, approximately 45 to 70 ⁇ m, approximately 50 to 200 ⁇ m, approximately 50 to 85 ⁇ m, approximately 50 to 75 ⁇ m, approximately 50 to 70 ⁇ m, approximately 55 to 200 ⁇ m, approximately 55 to 85 ⁇ m, approximately 55 to 75 ⁇ m, and approximately 55 to 70 ⁇ m.
• the high formability of the exterior film 50 facilitates deep drawing, which can contribute to increasing the capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably approximately 60 ⁇ m or less, more preferably approximately 50 ⁇ m or less, even more preferably approximately 40 ⁇ m or less, even more preferably approximately 30 ⁇ m or less, and particularly preferably approximately 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably approximately 10 ⁇ m or more, more preferably approximately 15 ⁇ m or more.
• Preferred thickness ranges for the stainless steel foil include approximately 10 to 60 ⁇ m, approximately 10 to 50 ⁇ m, approximately 10 to 40 ⁇ m, approximately 10 to 30 ⁇ m, approximately 10 to 25 ⁇ m, approximately 15 to 60 ⁇ m, approximately 15 to 50 ⁇ m, approximately 15 to 40 ⁇ m, approximately 15 to 30 ⁇ m, and approximately 15 to 25 ⁇ m.
• the barrier layer 52 is an aluminum foil, it is preferable that a corrosion-resistant coating be provided on at least the surface opposite the substrate layer 51 to prevent dissolution and corrosion.
• the barrier layer 52 may be provided with a corrosion-resistant coating on both sides.
• the corrosion-resistant coating refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) by performing, for example, a hydrothermal conversion treatment such as boehmite treatment, a chemical conversion treatment, anodizing treatment, a plating treatment using nickel or chromium, or a corrosion prevention treatment such as applying a coating agent on the surface of the barrier layer 52.
• the corrosion-resistant coating refers to a coating that improves the acid resistance of the barrier layer 52 (acid-resistant coating), a coating that improves the alkali resistance of the barrier layer 52 (alkali-resistant coating), etc.
• the corrosion-resistant coating may be formed by one type of treatment or a combination of two or more types.
• the barrier layer 52 may be formed not only as a single layer but also as a multi-layer.
• hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved using a treatment agent to form metal compounds with excellent corrosion resistance. Note that these treatments are sometimes included in the definition of chemical conversion treatment.
• the corrosion-resistant coating is also included in the barrier layer 52.
• the corrosion-resistant coating prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the substrate layer 51 during molding of the exterior film 50, and prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by the reaction between the electrolyte and water, particularly when the barrier layer 52 is made of aluminum alloy foil, preventing dissolution and corrosion of the aluminum oxide present on the surface of the barrier layer 52. It also improves the adhesion (wettability) of the surface of the barrier layer 52, preventing delamination between the substrate layer 51 and the barrier layer 52 during heat sealing and between the substrate layer 51 and the barrier layer 52 during 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 heat-sealing properties to the exterior film 50.
• Examples of the heat-sealable resin layer 53 include resin films made of polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin, polyolefin resins such as polyethylene resin and polypropylene resin, 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 1000 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 preferably has one or more layers with buffering properties (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 53, and more preferably outside the barrier layer 52.
• the buffer layer may be laminated on the outside of the base layer 51, or the base layer 51 may also function as a buffer layer.
• the multiple buffer layers may be adjacent to each other, or may be laminated with the base layer 51, barrier layer 52, etc. interposed therebetween.
• the material constituting the buffer layer can be selected from any material with cushioning properties.
• materials with cushioning properties include rubber, nonwoven fabric, or foam sheet.
• rubber include natural rubber, fluororubber, or silicone rubber.
• the rubber hardness is preferably approximately 20 to 90.
• the material constituting the nonwoven fabric is preferably a material with 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 thickness range 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. Of these, the most preferred thickness range 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 even 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 damage to the exterior film 50 due to impact when the electricity storage device 10 is dropped or due to handling during manufacturing of the electricity storage device 10.
• the lid body 60 has a lid main body 70 and a covering body 90 that covers a portion of the lid main body 70.
• the lid body 60 can be manufactured, for example, by injection molding the covering body 90 onto the lid main body 70.
• the lid body 70 is composed of a conductive material.
• “Composed of a conductive material” means that, when the total mass of the materials constituting the lid body 70 is taken as 100 mass%, the conductive material content 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 lid body 70 can contain materials other than the conductive material in addition to the conductive material.
• a lid body 70 composed of a conductive material preferably has a corrosion-resistant coating as described for the barrier layer 52.
• the conductive material that constitutes the lid body 70 is, for example, a metal material.
• the metal material that constitutes the lid body 70 is, for example, aluminum, aluminum alloy, nickel, copper, or a copper alloy.
• the lid body 70 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the lid body 70 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material that constitutes the lid body 70 connected to the negative electrode may be nickel-plated copper.
• the material that constitutes the lid body 70 may include recycled metal material.
• the lid body 70 has a base 71 and a wall 72.
• the base 71 shown in Figures 4 and 5 is, for example, a rectangular plate and has a first surface 71A and a second surface 71B.
• the first surface 71A faces the outside.
• the second surface 71B is the surface opposite the first surface 71A.
• the second surface 71B faces the electrode body 20.
• the lid body 60 may be positioned so that the first surface 71A faces the electrode body 20, in other words, so that the second surface 71B faces the outside.
• the base 71 may have any shape, such as a cylinder, prism, rectangular parallelepiped, or cube.
• a through hole 71Z is formed in the base 71, into which the electrode terminal unit 30 is inserted. The position at which the through hole 71Z is formed in the base 71 can be selected arbitrarily.
• the through hole 71Z is formed approximately in the center of the base 71. If the base 71 is made of a conductive material, the end of the current collector of the electrode body 20 may be connected to the second surface 71B of the base 71. If the end of the current collector of the electrode body 20 is connected to the second surface 71B of the base 71, the electrode terminal unit 30 may be omitted. If the electrode terminal unit 30 is omitted, the through-hole 71Z can be used, for example, as a hole for injecting an electrolyte solution or a hole for inserting a thermocouple for measuring the temperature of the electrode body 20 during the manufacturing process of the electricity storage device 10.
• the through-hole 71Z is used as a hole for injecting an electrolyte solution or a hole for inserting a thermocouple for measuring the temperature of the electrode body 20, it is preferable that the through-hole 71Z be closed with an optional member when the electricity storage device 10 is in use.
• the wall portion 72 is covered by the covering body 90.
• the wall portion 72 is frame-shaped and rises from the edge of the base portion 71.
• the wall portion 72 has a first wall portion 72A, a second wall portion 72B, a third wall portion 72C, and a fourth wall portion 72D.
• the first wall portion 72A forms the upper surface of the lid body 70.
• the first wall portion 72A extends in a first direction (in this embodiment, the LR direction) when viewed from the front of the lid body 70.
• the second wall portion 72B and the third wall portion 72C are connected to the first wall portion 72A and the fourth wall portion 72D and form the side surfaces of the lid body 70.
• the second wall portion 72B and the third wall portion 72C extend in a second direction (in this embodiment, the UD direction) that intersects the first direction when viewed from the front of the lid body 70.
• the first direction and the second direction are perpendicular when viewed from the front of the lid body 70.
• the first direction and the second direction do not have to be perpendicular to each other when viewed from the front of the lid body 70.
• the fourth wall portion 72D forms the underside of the lid body 70.
• the fourth wall portion 72D extends in the first direction (the LR direction in this embodiment) when viewed from the front of the lid body 70.
• At least a portion of the surface 72X of the wall portion 72 is covered by the covering body 90. In this embodiment, the entire surface 72X of the wall portion 72 is covered by the covering body 90.
• resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenolic resin, as well as modified versions of these resins.
• the resin material may also be a mixture of these resins, a copolymer, or a modified copolymer.
• the resin material is preferably a heat-sealable resin such as polyester or polyolefin, with polyolefin being more preferred.
• the covering 90 may be molded using any molding method.
• the resin material contained in the material constituting the coating 90 is preferably an olefin-based random copolymer, more preferably a resin containing a polyolefin skeleton as the main component, even more preferably a polyolefin as the main component, and even more preferably a polypropylene as the main component.
• the polyolefin may be an acid-modified polyolefin.
• the resin material contained in the material constituting the coating 90 preferably contains multiple types of amide-based lubricants. Furthermore, the resin material contained in the material constituting the coating 90 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 90 may be a polyolefin resin to which a propylene-based elastomer having a melting point higher than 150°C has been added.
• a "main component” refers to a material that accounts for, for example, 35% by mass or more, 50% by mass or more, 90% by mass or more, or 95% by mass or more of the materials contained in the constituent elements.
• polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters.
• Copolymer polyesters include those in which ethylene terephthalate is the main repeating unit.
• ethylene terephthalate is the main repeating unit polymerized with ethylene isophthalate
• polyethylene (terephthalate/isophthalate) polyethylene
• polyethylene (terephthalate/adipate) polyethylene (terephthalate/sodium sulfoisophthalate)
• polyethylene (terephthalate/sodium isophthalate) polyethylene (terephthalate/phenyl dicarboxylate), and polyethylene (terephthalate/decane dicarboxylate).
• polybutylene terephthalate is preferred as the resin material, due to its enhanced 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, polypropylene block copolymers (e.g., propylene and ethylene block copolymers), and polypropylene random copolymers (e.g., propylene and ethylene random copolymers); propylene- ⁇ -olefin copolymers; and ethylene-butene-propylene terpolymers.
• polyolefin resins are copolymers, they may be block copolymers or random copolymers. Of these, polypropylene is preferred as the resin material due to its excellent heat-sealing properties and electrolyte resistance.
• the resin used as the resin material may contain a filler as needed.
• specific examples of 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 90 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 in accordance with JIS K7210-1:2014.
• the melt mass flow rate is measured at a temperature of 230°C.
• the covering body 90 has a lid seal portion 91.
• the lid seal portion 91 is heat-sealed to the heat-fusible resin layer 53 of the exterior film 50.
• the lid seal portion 91 includes a first seal surface 91A, a second seal surface 91B, a third seal surface 91C, and a fourth seal surface 91D.
• the first seal surface 91A forms the upper surface of the lid body 60.
• the first seal surface 91A is formed on the first wall portion 72A.
• the first seal surface 91A extends in a first direction (in this embodiment, the LR direction) when viewed from the front of the lid body 60.
• the second seal surface 91B and the third seal surface 91C are connected to the first seal surface 91A and the fourth seal surface 91D and form the side surfaces of the lid body 60.
• the second seal surface 91B is formed on the second wall portion 72B.
• the third seal surface 91C is formed on the third wall portion 72C.
• the second sealing surface 91B and the third sealing surface 91C extend in a second direction (UD direction in this embodiment) that intersects with the first direction when the lid 60 is viewed from the front.
• the first direction and the second direction are perpendicular to each other when the lid 60 is viewed from the front.
• the first direction and the second direction do not have to be perpendicular to each other when the lid 60 is viewed from the front.
• the fourth sealing surface 91D forms the underside of the lid 60.
• the fourth sealing surface 91D extends in the first direction (LR direction in this embodiment) when the lid 60 is viewed from the front.
• the fourth sealing surface 91D is formed on the fourth wall portion 72D.
• the lid seal portion 91 further includes boundaries 92, 93, 94, and 95.
• Boundary 92 is the boundary between the first seal surface 91A and the second seal surface 91B.
• Boundary 93 is the boundary between the first seal surface 91A and the third seal surface 91C.
• Boundary 94 is the boundary between the fourth seal surface 91D and the second seal surface 91B.
• Boundary 95 is the boundary between the fourth seal surface 91D and the third seal surface 91C.
• the shapes of the boundaries 92-95 may be angular, or may be rounded by applying a rounded edge. In this embodiment, the boundaries 92-95 are angular. If the shapes of the boundaries 92-95 are rounded, it is preferable that the radius of curvature of the boundaries 92-95 be in the range of more than 0 mm and less than or equal to 2.0 mm.
• the material constituting the heat-sealable resin layer of the adhesive film on the side that is bonded to the lid 60 is preferably an acid-modified polyolefin resin graft-modified with an acid such as maleic anhydride.
• the heat-sealable resin layer of the adhesive film on the side that is bonded to the exterior film 50 is preferably made of the same type of material as the material that constitutes the heat-sealable resin layer 53 of the exterior film 50.
• the heat-resistant substrate layer may be a film made of a heat-resistant resin, such as polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, or polypropylene, and is either unstretched or stretched.
• a heat-resistant resin such as polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, or polypropylene, and is either unstretched or stretched.
• Polyethylene terephthalate is particularly preferred as it is inexpensive and strong.
• the adhesive film preferably has adhesive properties.
• Adhesion can be imparted to the adhesive film by incorporating a tackifying resin into the heat-sealable resin layer of the adhesive film.
• tackifying resins include amorphous polyolefins.
• amorphous polyolefins include amorphous polypropylene and copolymers of amorphous propylene and other ⁇ -olefins.
• the content of the tackifying resin relative to the base material constituting the heat-sealable resin is preferably 10 to 20% by weight or less.
• the lid body 60 When the lid body 60 is plate-shaped, it is preferable that the lid body 60 have a certain thickness so that deformation of the exterior body 40 is suppressed even when the energy storage device 10 is placed on top of it. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the lid seal portion 91 of the lid body 60 have a certain width in the FB direction so that the lid seal portion 91 of the lid body 60 and the exterior film 50 can be heat-sealed appropriately when forming the second sealing portion 100B described below.
• the minimum width of the lid seal portion 91 of the lid body 60 is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum width of the lid seal portion 91 of the lid body 60 is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm.
• the maximum width of the lid seal portion 91 of the lid body 60 may be 20 mm or more.
• Preferred width ranges for the lid seal portion 91 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 lid body 60 when the lid body 60 is described as plate-shaped, this does not include embodiments in which the lid body 60 is composed solely of a film as defined by the JIS (Japanese Industrial Standards) "Packaging Terminology" standard.
• the width of the lid seal portion 91 of the lid body 60 may vary depending on the location. If the width of the lid seal portion 91 of the lid body 60 varies depending on the location, the width of the lid seal portion 91 of the lid body 60 is the width of the widest part.
• the facing surfaces of the exterior film 50 are heat-sealed to form the first sealed portion 100A.
• the first sealed portion 100A 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. 3.
• the first sealed portion 100A extends in the longitudinal direction of the exterior body 40.
• the position at which the first sealed portion 100A is formed in the exterior body 40 can be selected arbitrarily.
• the root 70X of the first sealed portion 100A is preferably located on the edge 43 at the boundary between the first surface 41 and the second surface 42 of the exterior body 40.
• the first surface 41 has a larger area than the second surface 42.
• the root 100AX of the first sealed portion 100A may be located on any surface of the exterior body 40.
• the first sealed portion 100A protrudes outward beyond the electrode body 20 in a planar view.
• the first sealed portion 100A may be folded, for example, toward the second surface 42 of the exterior body 40 or toward the first surface 41.
• the second sealing portion 100B is formed by heat-sealing the heat-sealable resin layer 53 of the exterior film 50 and the lid seal portion 91 of the lid body 60.
• the seal strength between the heat-sealable resin layer 53 of the exterior film 50 and the lid seal portion 91 of the lid body 60 may be referred to as the seal strength (bonding strength) of the second sealing portion 100B.
• the seal strength of the second sealing portion 100B is the seal strength between the heat-sealable resin layer 53 and the lid body 60 at the long side portion of the lid seal portion 91, i.e., the lid seal portion 91 extending in the LR (width) direction in FIG. 1A.
• the seal strength of the second sealing portion 100B is measured as follows. First, a slit is made in the portion of the exterior film 50 that constitutes the first surface 41 of the exterior body 40, forming three strip-shaped members 41X, 41Y, and 41Z (see the two-dot chain lines in Figure 1B) aligned in the LR direction. The width of the three strip-shaped members 41X, 41Y, and 41Z in the LR direction is 15 mm. The ends of the strip-shaped members 41X, 41Y, and 41Z are joined to the lid body 60 at the second sealing portion 100B. The length of the lid body 60 in the LR direction is 45 mm or more.
• the end of the strip-shaped members 41X, 41Y, and 41Z opposite the end joined to the lid body 60 is pulled upward in the UD direction (away from the first surface 41), thereby measuring the seal strength of each of the strip-shaped members 41X, 41Y, and 41Z.
• the distance between the zippers in the UD direction is 50 mm.
• the seal strengths of the strip-shaped members 41X, 41Y, and 41Z are the peak values of their respective seal strengths.
• the seal strength of the second sealing portion 100B is the average value of the seal strengths of the strip-shaped members 41X, 41Y, and 41Z.
• the seal strengths of the three strip-shaped members are measured using the same method as when the LR length of the lid body 60 is 45 mm or more.
• the obtained seal strengths are each divided by the arbitrary width X mm and multiplied by 15 to convert them to the seal strengths of the three strip-shaped members at a 15 mm width.
• the seal strength of the second sealing portion 100B is the average value of the seal strengths of the three strip-shaped members converted to a 15 mm width. Note that when the lid body 60 is divided into multiple parts including long and short sides, the seal strength of the second sealing portion 100B is the seal strength of the long side portions of the lid seal portions 91 of the multiple parts.
• the seal strength of the second sealing portion 100B is preferably 40 N/15 mm or more, more preferably 50 N/15 mm or more, even more preferably 60 N/15 mm or more, even more preferably 70 N/15 mm or more, and even more preferably 85 N/15 mm or more.
• the seal strength of the second sealing portion 100B is 40 N/15 mm or more, the state in which the electrode body 20 is sealed by the outer casing 40 is suitably maintained even after the energy storage device 10 has been used for, for example, several years (less than 10 years).
• the seal strength of the second sealing portion 100B is 85 N/15 mm or more, the state in which the electrode body 20 is sealed by the outer casing 40 is suitably maintained even after the energy storage device 10 has been used for, for example, 10 years or more.
• the seal strength of the second sealing portion 100B is preferably 300 N/15 mm or less.
• the preferred range for the seal strength of the second sealing portion 100B is 40N/15mm to 300N/15mm, 50N/15mm to 300N/15mm, 60N/15mm to 300N/15mm, 70N/15mm to 300N/15mm, or 85N/15mm to 300N/15mm.
• the lid body 60 preferably has a protrusion 96 protruding from the lid seal portion 91 so that a gap is less likely to form between the exterior film 50 and the lid body 60.
• the protrusion 96 may be formed integrally with the covering body 90, or may be formed separately from the covering body 90 and joined to the covering body 90. In this embodiment, the protrusion 96 is formed integrally with the covering body 90.
• the position at which the protrusion 96 is formed in the lid seal portion 91 can be selected arbitrarily.
• a gap between the exterior film 50 and the lid body 60 is likely to form, for example, between the base 100AX of the first sealing portion 100A and the lid body 60.
• the protrusion 96 be formed in the lid seal portion 91 at the location where the root 100AX of the first sealing portion 100A is located.
• the root 100AX of the first sealing portion 100A is located at the boundary 92 of the lid body 60.
• the protrusion 96 be formed in the lid seal portion 91 at the boundary 92.
• the first sealing portion 100A is sealed with the protrusion 96 sandwiched between them.
• the protrusion 96 may be formed on at least one of the first sealing surface 91A, the second sealing surface 91B, the third sealing surface 91C, the fourth sealing surface 91D, the boundary 93, the boundary 94, and the boundary 95.
• the shape of the protrusion 96 can be selected arbitrarily. In this embodiment, the shape of the protrusion 96 is plate-like. The thickness of the protrusion 96 can be selected arbitrarily. In this embodiment, the thickness of the protrusion 96 decreases with increasing distance from the boundary 92. In other words, the protrusion 96 tapers with increasing distance from the boundary 92. The thickness of the protrusion 96 may be constant, or may increase with increasing distance from the boundary 92.
• the direction in which the protrusion 96 extends can be selected arbitrarily.
• the protrusion 96 extends along a first direction (in this embodiment, the LR direction).
• the protrusion 96 may also extend along a second direction (in this embodiment, the UD direction).
• the protrusion 96 may also extend in a third direction that intersects the first direction (in this embodiment, the LR direction) and the second direction (in this embodiment, the UD direction) when the lid 60 is viewed from the front.
• the length of the protrusion 96 can be selected as desired, as long as it is equal to or shorter than the length of the first sealing portion 100A.
• the length of the protrusion 96 may be substantially equal to the length of the first sealing portion 100A, or may be 30% to 50% of the length of the first sealing portion 100A.
• a through hole 71Z is formed in the base 71 of the lid 60 for inserting the electrode terminal unit 30, etc.
• An insulating member 32 is joined to at least the portion of the outer surface of the terminal body 31 that is inserted into the through hole 71Z so as to prevent electrical continuity between the base 71 and the terminal body 31.
• the material constituting the insulating member 32 can be selected arbitrarily as long as it has insulating properties. Examples of materials constituting the insulating member 32 include resins such as polypropylene, polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide, and polyether ether ketone.
• the insulating member 32 is divided into an in-hole portion 32A, a first out-hole portion 32B, and a second out-hole portion 32C.
• the in-hole portion 32A is disposed within the through hole 71Z.
• the first out-hole portion 32B is connected to the in-hole portion 32A and is disposed outside the through hole 71Z in the internal space of the exterior body 40.
• the second out-of-hole portion 32C is connected to the in-hole portion 32A and is positioned outside the through-hole 71Z outside the exterior body 40.
• the internal space of the exterior body 40 is defined by the second surfaces 71B of the pair of lid bodies 60 and the heat-sealable resin layer 53 of the exterior film 50. Note that the insulating member 32 does not necessarily have to have the first out-of-hole portion 32B or the second out-of-hole portion 32C.
• the electrode terminal unit 30 is composed only of the terminal body 31 and the insulating member 32, there is a risk that at least one of moisture and gas present outside the exterior body 40 may infiltrate into the internal space of the exterior body 40 via the second external hole-arranged portion 32C and the internal hole-arranged portion 32A.
• the electrode terminal unit 30 has a barrier member 33 to prevent at least one of moisture and gas from infiltrating into the internal space of the exterior body 40.
• "preventing at least one of moisture and gas from infiltrating into the internal space of the exterior body 40" includes at least one of the first and second meanings. The first meaning is to restrict the infiltration of moisture and gas into the internal space of the exterior body 40. The second meaning is to delay the time from when the moisture and gas reach the internal hole-arranged portion 32A to when the moisture and gas are released into the internal space of the exterior body 40.
• the material constituting the barrier member 33 can be selected from any material that has at least one of higher moisture barrier properties and gas barrier properties than the material constituting the insulating member 32.
• High moisture barrier properties mean low water vapor permeability.
• High gas barrier properties mean low permeability to gases such as carbon monoxide, oxygen, or carbon dioxide.
• the barrier member 33 has higher moisture barrier properties and gas barrier properties than the insulating member 32.
• the material constituting the barrier member 33 is, for example, metal or ceramic.
• the barrier member 33 may be a film that includes the barrier layer 52 of the exterior film 50.
• the barrier member 33 is arranged so as to cover at least a portion of the first out-of-hole portion 32B of the insulating member 32. It is preferable that the barrier member 33 be joined to the first out-of-hole portion 32B by any method so as to cover at least a portion of the first out-of-hole portion 32B. From the perspective of preventing moisture and gas that reach the in-hole portion 32A of the insulating member 32 from the outside of the exterior body 40 from being immediately released into the internal space of the exterior body 40, it is preferable that the barrier member 33 cover at least the end of the first out-of-hole portion 32B on the through-hole 71Z side.
• the barrier member 33 is arranged so as to cover at least a portion of the second out-of-hole portion 32C of the insulating member 32.
• the barrier member 33 is preferably joined to the second out-of-hole portion 32C by any method so as to cover at least a portion of the second out-of-hole portion 32C.
• the barrier member 33 preferably covers at least the end of the second out-of-hole portion 32C on the through-hole 71Z side.
• the barrier member 33 is arranged so as to cover substantially the entire outer surface of the insulating member 32.
• the end 33A of the barrier member 33 be insulated.
• the end 33A is the end opposite the through-hole 71Z in the portion of the barrier member 33 that covers at least a portion of the first outer hole portion 32B.
• the end 33A is insulated by being covered with the insulating member 32.
• the end 33A may be insulated by being provided with an insulating coating, or by being covered with an insulating member other than the insulating member 32.
• 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, and a fifth step.
• the first step to the fifth step are performed, for example, by a manufacturing apparatus for the power storage device 10. At least some of the first step to the fifth step may be performed by an operator.
• the first step to the fifth step are names of the steps in the method for manufacturing the power storage device 10 specified for convenience, and do not necessarily refer to the order of the steps.
• the order of the first step to the fifth step can be changed as desired as long as it is not technically inconsistent.
• step S12 is performed after the first process.
• the manufacturing equipment joins the electrode terminal unit 30 connected to the electrode body 20 to the lid body 60.
• the lid body 60 with the electrode terminal unit 30 joined thereto may be placed in the first process, and the electrode terminal unit 30 and electrode body 20 may be connected in the second process.
• the third step of step S13 is performed after the second step.
• 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 using a 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 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 direction opposite 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 with the electrode terminal unit 30 connected thereto may be housed inside an exterior film 50 configured in a cylindrical shape so that openings are formed at both ends in the FB direction, and after the electrode body 20 and the lid 60 are joined together, the opening may be closed by the lid 60.
• the electrode body 20 connected to the lid 60 via the electrode terminal unit 30 may be housed inside an exterior film 50 configured in a cylindrical shape so that openings are formed at both ends in the FB direction, and the opening may be closed by the lid 60.
• step S14 is performed after the third step.
• the manufacturing device heat-seals the exterior film 50 and the lid body 60 to form the second sealed portion 100B.
• the fifth step of step S15 is performed before or after the fourth step.
• the manufacturing equipment heat-seals 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 while restricting the movement of the electrode body 20 and the lid body 60, while applying tension to the exterior film 50, thereby forming the first sealed portion 100A.
• the above-described embodiments are examples of possible forms of the lid, electricity storage device, lid unit, electrode terminal unit, electricity storage device, and electricity storage device manufacturing method according to the present invention, and are not intended to limit the forms.
• the lid, electricity storage device, lid unit, electrode terminal unit, electricity storage device, and electricity storage device manufacturing method according to the present invention may take forms different from those exemplified in the embodiments. Examples include forms in which part of the configuration of the embodiments is replaced, modified, or omitted, or forms in which a new configuration is added to the embodiments. Some examples of modified embodiments are shown below. Note that the following modified forms can be combined with each other as long as there is no technical contradiction.
• the barrier member 33 is separate from the lid body 70, but if the lid body 70 is configured to include a conductive material, the barrier member 33 may be configured integrally with the lid body 70. In other words, the barrier member 33 may be configured by modifying a portion of the lid body 70. In both cases where the barrier member 33 and the lid body 70 are separate, and where the barrier member 33 and the lid body 70 are integrally formed, the presence or absence of the barrier member 33 can be confirmed by observing the surface of the boundary between the barrier member 33 and the lid body 70 using a stereomicroscope, an optical microscope, a laser microscope, or the like.
• the barrier member 133 has a first barrier member 133A and a second barrier member 133B.
• the first barrier member 133A extends from the end face of the through hole 71Z on the second surface 71B side toward the electrode body 20.
• the first barrier member 133A covers at least a portion of the first out-of-hole portion 32B of the insulating member 32.
• the second barrier member 133B extends from the end face of the through hole 71Z on the first surface 71A side toward the external space.
• the second barrier member 133B covers at least a portion of the second out-of-hole portion 32C of the insulating member 32.
• the end face 133AX of the first barrier member 133A opposite the through hole 71Z is insulated.
• Methods for insulating the end face 133AX include the methods exemplified in the embodiments.
• the barrier member 33 may be omitted, and the insulating member 32 may be directly covered by the barrier member 133.
• Second Modified Example> 10 is a cross-sectional view of a lid 260 according to a second modification, which is a modification of the first modification.
• the terminal body 31 is not inserted into the lid 260.
• the through-hole 71Z is used to inject the electrolyte of the exterior body 40 or to insert a thermocouple.
• the first outer-hole portion 32B of the insulating member 32 may be bonded to the inner circumferential surface of the first barrier member 133A.
• the second outer-hole portion 32C of the insulating member 32 may be bonded to the inner circumferential surface of the second barrier member 133B.
• Fig. 11 is a cross-sectional view of a lid body 360 according to a third modified example, which is a modified example of the second modified example. As shown in Fig. 11, when the insulating member 32 does not have the second out-of-hole portion 32C, the lid body 70 may omit the second barrier member 133B.
• Fig. 12 is a cross-sectional view of a lid body 460 of a fourth modified example.
• the lid 460 has a base 471.
• the base 471 is made of a conductive material.
• An insulating member 32 is bonded to the inner surface of the through-hole 71Z.
• the thickness HA of the base 471 is 1.0 mm or greater. To ensure that the base 471 functions effectively as a barrier member, the thickness HA of the base 471 is preferably 2.0 mm or greater, and more preferably 3.0 mm or greater. If the thickness HA of the base 471 varies in parts, the thickness HA of the base 471 is the thickness of the thickest part.
• the thickness HA of the base 471 is 1.0 mm or greater, the time from when at least one of moisture and gas enters the insulating member 32 or through-hole 71Z from outside the exterior body 40 to when the moisture and gas are released into the internal space of the exterior body 40 can be sufficiently delayed.
• the lid body 70 is configured to include a conductive material, but the lid body 70 may be configured to include a resin material.
• the cover 90 of the lid body 60 may be omitted.
• the wall portion 72 may be omitted from the lid body 70.
• the cover 90 may cover at least a part of the side surface of the base 71.
• the cover 90 may be omitted and the side surface of the base 71 and the heat-sealable resin layer 53 of the exterior film 50 may be joined together.
• the exterior film 50 of the power storage device 10 may extend outward beyond 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 extends outward beyond the lid body 60.
• the portion of the exterior film 50 that extends beyond 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 terminal body 31 preferably has a length in the FB direction that is sufficient to be exposed from the closed portion of the exterior film 50.
• the exterior body 40 may not have one of the two lid bodies 60.
• the electrode body 20 in the portion of the exterior body 40 where the lid body 60 is omitted, the electrode body 20 is sealed by closing the 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-type container.
• 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 30 Electrode terminal unit 31: Terminal body 32: Insulating member 32A: In-hole disposed portion 32B: First outside-hole disposed portion (outside-hole disposed portion) 32C: Second outside hole arrangement part (outside hole arrangement part) 33: Barrier member 33A: End portion 40: Exterior body 50: Exterior film 60, 260, 360, 460: Lid body 60Z: Lid unit 70: Lid main body 71A: First surface 71B: Second surface 71Z: Through hole

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• 2025
  • 2025-03-06 WO PCT/JP2025/008258 patent/WO2025187782A1/ja active Pending
  • 2025-03-06 JP JP2025551771A patent/JP7800787B1/ja active Active

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