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
  • 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
  • H01M50/164—Lids or covers 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
  • H01M50/183—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
  • H01M50/19—Sealing members characterised by the material
  • H01M50/197—Sealing members characterised by the material having a layered structure
• • 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 kit, a lid unit, a base part, a first covering part, a second covering part, and a method for manufacturing an electricity storage device.
• Patent Document 1 discloses an example of an electricity storage device.
• This electricity storage device includes an electrode body and an exterior body that seals the electrode body.
• the exterior body has an exterior film that encases the electrode body and a lid body that is joined to the exterior film.
• the lid body is made of a metal material.
• the lid in order to properly bond the exterior film and the lid, it is conceivable to cover the lid with a covering made of a resin material and then bond the covering to the exterior film.
• the resin material is injection molded onto the lid, for example, there is a risk that the lid may deform. If the lid deforms, for example, there is a risk that the sealing ability of the exterior body may be reduced.
• the present invention aims to provide a lid that is suppressed from deforming, an electricity storage device that includes this lid, a lid kit, a lid unit, a base part, a first covering part, a second covering part, and a method for manufacturing an 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 includes a base part containing a conductive material and including a first surface and a second surface opposite the first surface; a first covering part containing a resin material and covering at least a portion of the first surface of the base part; and a second covering part containing a resin material and covering at least a portion of the second surface of the base part.
• a lid body according to a second aspect of the present invention is a lid body according to the first aspect, which includes a portion where the first covering part and the second covering part come into contact.
• a lid according to a third aspect of the present invention is the lid according to the first aspect, wherein the edge of the base part is sandwiched between the first covering part and the second covering part.
• 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 base part has a main part, a wall part protruding from the main part, and an internal space defined by the wall part, and the first covering part includes a housing part housed in the internal space.
• a lid according to a fifth aspect of the present invention is a lid according to any one of the first to fourth aspects, wherein the thickness of the base part is 5.0 mm or less.
• a sixth aspect of the present invention provides an energy storage device comprising an electrode body and an exterior body that seals the electrode body.
• the exterior body has an exterior film that wraps the electrode body and a lid that, together with the exterior film, seals the electrode body.
• the lid has a base part that includes a conductive material and has a first surface and a second surface opposite the first surface, a first covering part that includes a resin material and covers at least a portion of the first surface of the base part, and a second covering part that includes a resin material and covers at least a portion of the second surface of the base part.
• a lid kit according to a seventh aspect of the present invention is a lid kit for forming a lid to be used in the exterior of an electricity storage device, and includes a base part containing a conductive material and including a first surface and a second surface opposite the first surface, a first covering part containing a resin material and covering at least a portion of the first surface of the base part, and a second covering part containing a resin material and covering at least a portion of the second surface of the base part.
• the lid unit according to an eighth aspect of the present invention is a lid unit that constitutes a lid body used in the exterior of an electricity storage device, and includes a base part that is made up of a conductive material and includes a first surface and a second surface opposite the first surface, and a first covering part that is made up of a resin material and covers at least a portion of the first surface of the base part.
• a lid unit according to a ninth aspect of the present invention is a lid unit that constitutes a lid body used in the exterior of an electricity storage device, and includes a base part that is made up of a conductive material and includes a first surface and a second surface opposite the first surface, and a second covering part that is made up of a resin material and covers at least a portion of the second surface of the base part.
• a base part according to a tenth aspect of the present invention is a base part constituting a lid used in the exterior of an electricity storage device, the base part comprising a conductive material and having a first surface at least partially covered by a first covering part comprising a resin material, and a second surface opposite the first surface at least partially covered by a second covering part comprising a resin material.
• a first covering part according to an eleventh aspect of the present invention is a first covering part constituting a lid body used in the exterior of an electricity storage device, the lid body being constructed to include a conductive material and having a base part including a first surface and a second surface opposite the first surface, and the first covering part being constructed to include a resin material and configured to cover at least a portion of the first surface of the lid body.
• a second covering part according to a twelfth aspect of the present invention is a second covering part constituting a lid used in the exterior of an electricity storage device, the lid including a conductive material and having a base part including a first surface and a second surface opposite the first surface, and the second covering part including a resin material and configured to cover at least a portion of the second surface of the lid.
• a thirteenth aspect of the present invention relates to a method for manufacturing an electricity storage device, the method comprising: an electrode assembly; and an exterior body sealing the electrode assembly; the exterior body having an exterior film wrapping the electrode assembly; and a lid body sealing the electrode assembly together with the exterior film; the lid body comprising a base part containing a conductive material and including a first surface and a second surface opposite the first surface; a first covering part containing a resin material and covering at least a portion of the first surface of the base part; and a second covering part containing a resin material and covering at least a portion of the second surface of the base part.
• the method for manufacturing the electricity storage device comprises the step of placing the lid body on the electrode assembly.
• the lid, electricity storage device, lid kit, lid unit, base part, first covering part, second covering part, and method for manufacturing an electricity storage device according to the present invention can prevent the lid from deforming.
• 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 a base part of a lid body included in the electricity storage device of FIG. 1A.
• FIG. 1B is a perspective view of a first covering part of a lid provided in the electricity storage device of FIG. 1A.
• FIG. 1B is a perspective view of a second covering part of the lid provided in the electricity storage device of FIG. 1A.
• 1B is a cross-sectional view taken along line D7-D7 in FIG. 1A.
• FIG. 1B is a cross-sectional view of a lid unit constituting the lid body of FIG. 1A.
• FIG. 1B is a cross-sectional view of another lid unit that constitutes the lid body of FIG. 1A.
• 1B is a flowchart showing an example of a method for manufacturing 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. 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 a base part 70 of a lid body 60 included in the electricity storage device 10 of FIG. 1A.
• 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
• FIG. 5 is a perspective view of a first covering part 80 of the lid body 60 included in the electricity storage device 10 of FIG. 1A.
• FIG. 6 is a perspective view of a second covering part 90 of the lid body 60 included in the electricity storage device 10 of FIG. 1A.
• FIG. 7 is a cross-sectional view taken along line D7-D7 in FIG. 1A. 1A, the direction of the arrow UD indicates the thickness direction of the power storage device 10, the direction of the arrow LR indicates the width direction of the power storage device 10, and the direction of the arrow FB indicates the depth direction of the power storage device 10.
• the directions indicated by the arrows UDLRFB are the same in the subsequent figures.
• the energy storage device 10 comprises an electrode body 20, an electrode terminal 30, and an outer casing 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 terminals 30.
• the electrode terminals 30 are metal terminals used for inputting and outputting power to and from the electrode body 20.
• the shape of the electrode terminals 30 can be selected arbitrarily. In the example shown in FIG. 1A etc., the electrode terminals 30 are cylindrical. The electrode terminals 30 may also be prism-shaped or plate-shaped. One end of the electrode terminal 30 is electrically connected to an electrode (positive or negative) included in the electrode body 20. The other end of the electrode terminal 30 protrudes outward from, for example, an edge of the exterior body 40. Note that the electrode terminals 30 only need to be capable of inputting and outputting power to and from the electrode body 20, and do not, for example, need not protrude from the exterior body 40.
• the lid body 60 described below is made of, for example, metal, the lid body 60 may also function as the electrode terminals 30. In this case, the lid body 60, which functions as an electrode terminal, may or may not protrude from the exterior body 40.
• the metal material that makes up the electrode terminal 30 is, for example, aluminum, nickel, or copper.
• the electrode terminal 30 connected to the positive electrode is typically made of aluminum
• the electrode terminal 30 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; it may be, for example, a protective tape or a separator.
• 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 base part 70, a first covering part 80, and a second covering part 90.
• the base part 70 is composed of a conductive material.
• “Composed of a conductive material” means that, when the entire material constituting the base part 70 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 base part 70 can contain materials other than the conductive material in addition to the conductive material.
• a base part 70 composed of a conductive material preferably has the corrosion-resistant coating described for the barrier layer 52.
• the conductive material that makes up the base part 70 is, for example, a metal material.
• the metal material that makes up the base part 70 is, for example, aluminum, aluminum alloy, nickel, copper, or a copper alloy.
• the base part 70 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the base part 70 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material that makes up the base part 70 connected to the negative electrode may be nickel-plated copper.
• the material that makes up the base part 70 may also include recycled metal materials.
• the base part 70 may be a film or a metal molded product.
• the base part 70 is described as a metal molded product, this does not include an embodiment in which the base part 70 is composed solely of a film as defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the base part 70 has a main portion 71, a wall portion 72, and an internal space 73.
• the outer shape of the main portion 71 can be selected arbitrarily as long as it can seal the electrode body 20. In the example shown in FIG. 4 etc., the outer shape of the main portion 71 is rectangular. The outer shape of the main portion 71 may also be circular, elliptical, square, triangular, or a polygon with pentagons or more sides.
• the main portion 71 has a first surface 71A and a second surface 71B.
• the first surface 71A faces the electrode body 20 via the first covering part 80.
• the second surface 71B is the surface opposite the first surface 71A in the FB direction.
• the second surface 71B faces the external space via the second covering part 90.
• the lid body 60 may be positioned so that the first surface 71A faces the external space, in other words, so that the second surface 71B faces the second covering part 90.
• the main portion 71 has a hole 71Z formed through the first surface 71A and the second surface 71B.
• the electrode terminal 30 is inserted into the hole 71Z.
• an insulating member 110 see Figure 7
• the wall portion 72 protrudes from the outer peripheral edge of the main portion 71.
• the direction in which the wall portion 72 protrudes can be selected arbitrarily. In the example shown in Figure 4 etc., the wall portion 72 protrudes from the outer peripheral edge of the main portion 71 towards the electrode body 20 in the FB direction.
• the wall portion 72 may also protrude from the outer peripheral edge of the main portion 71 in the opposite direction to the electrode body 20, in other words towards the external space, in the FB direction.
• the wall portion 72 may also protrude from the outer peripheral edge of the main portion 71 in a direction intersecting the FB direction when viewed from the side of the lid body 60.
• the wall portion 72 has a first wall surface 72X and a second wall surface 72Y.
• the first wall surface 72X is the surface covered by the second covering part 90.
• the second wall surface 72Y is the surface opposite the first wall surface 72X.
• the second wall surface 72Y is the surface covered by the first covering part 80.
• the wall portion 72 includes 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 extends in a first direction (in this embodiment, the LR direction) when the lid body 60 is viewed from the front.
• 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.
• 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 the lid body 60 is viewed from the front.
• the first direction and the second direction are orthogonal when the lid body 60 is viewed from the front.
• the first direction and the second direction do not have to be orthogonal when the lid body 60 is viewed from the front.
• the fourth wall portion 72D extends in the first direction (the LR direction in this embodiment) when the lid body 60 is viewed from the front.
• the thicknesses of the first to fourth wall portions 72A to 72D are substantially constant in the FB direction.
• the thicknesses of the first to fourth wall portions 72A to 72D may vary in the FB direction.
• at least one of the first to fourth wall portions 72A to 72D may have a tapered shape in which the thickness increases or decreases in the FB direction as it approaches the electrode body 20. If the first to fourth wall portions 72A to 72D have a tapered shape, from the viewpoint of suppressing an increase in the internal pressure of the exterior body 40, it is preferable that the tapered shape be a tapered shape in which the thickness increases as it approaches the electrode body 20.
• the first and fourth wall portions 72A and 72D, which are longer in the LR direction, of the wall portions 72 have a constant thickness in the FB direction; in other words, they do not have a tapered shape.
• the wall portion 72 further includes boundaries 72E, 72F, 72G, and 72H.
• Boundary 72E is the boundary between the first wall portion 72A and the second wall portion 72B.
• Boundary 72F is the boundary between the first wall portion 72A and the third wall portion 72C.
• Boundary 72G is the boundary between the fourth wall portion 72D and the second wall portion 72B.
• Boundary 72H is the boundary between the fourth wall portion 72D and the third wall portion 72C.
• the shapes of the boundaries 72E-72H may be angular, or may be rounded by applying a rounded edge. In this embodiment, the boundaries 72E-72H are angular. If the shapes of the boundaries 72E-72H are rounded, the radius of curvature of the boundaries 72E-72H is preferably within the range of 0 mm to 2.0 mm.
• the internal space 73 is defined by the first surface 71A of the main portion 71 and the second wall surface 72Y of the wall portion 72. A portion of the first covering part 80 is housed in the internal space 73.
• the thickness of the base part 70 can be selected arbitrarily. If the base part 70 is a film, the thickness of the base part 70 is preferably 9 ⁇ m or more, from the viewpoint of preventing damage to the base part 70 or preventing the occurrence of pinholes. If the base part 70 is a film, the thickness of the base part 70 is preferably 0.2 mm or less, from the viewpoint of suitable molding. If the base part 70 is a film, the preferred range for the thickness of the base part 70 is 9.0 ⁇ m or more and 0.2 mm or less. The thicknesses of the first wall portion 72A and the fourth wall portion 72D are measured in the UD direction. The thicknesses of the second wall portion 72B and the third wall portion 72C are measured in the LR direction. The thickness of the main portion 71 is measured in the FB direction.
• the thickness of the base part 70 is preferably 0.2 mm or more, and more preferably 0.5 mm or more. If the base part 70 is a metal molded product, from the viewpoint of reducing the weight of the lid body 60, the thickness of the base part 70 is preferably 5.0 mm or less, and more preferably 2.0 mm or less.
• the preferred range of the thickness of the base part 70 is 0.2 mm or more to 5.0 mm or less, 0.2 mm or more to 2.0 mm or less, 0.5 mm or more to 5.0 mm or less, or 0.5 mm or more to 2.0 mm or less. Note that if the thickness of the base part 70 varies depending on the portion, the thickness of the base part 70 is the thickness of the thickest portion. From the viewpoint of reducing the weight of the lid body 60, the thickness of the base part 70 is preferably thinner than at least one of the thicknesses of the first covering part 80 and the second covering part 90.
• the thickness of the base part 70 be thinner than the thickness of the first covering part 80 and the thickness of the second covering part 90.
• the thicknesses of the first wall portion 72A and the fourth wall portion 72D are measured in the UD direction.
• the thicknesses of the second wall portion 72B and the third wall portion 72C are measured in the LR direction.
• the thickness of the main portion 71 is measured in the FB direction.
• the width of the base part 70 in the LR direction can be selected arbitrarily. If the base part 70 is a film, the width of the base part 70 in the LR direction is preferably 10 mm or more. If the base part 70 is a film, the width of the base part 70 in the LR direction is preferably 500 mm or less. If the base part 70 is a film, the preferred range for the width of the base part 70 in the LR direction is 10 mm or more and 500 mm or less.
• the UD height of the base part 70 can be selected arbitrarily. If the base part 70 is a film, the UD height of the base part 70 is preferably 10 mm or more. If the base part 70 is a film, the UD height of the base part 70 is preferably 500 mm or less. If the base part 70 is a film, the preferred range for the UD height of the base part 70 is 10 mm or more and 500 mm or less.
• the first covering part 80 covers at least a portion of the first surface 71A of the base part 70. In this embodiment, the first covering part 80 covers the entire first surface 71A.
• the first covering part 80 is composed of a resin material.
• “composed of a resin material” means that, when the entire material constituting the first covering part 80 is taken as 100% by mass, the resin material content is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.
• the material constituting the first covering part 80 can contain materials other than resin materials in addition to resin materials.
• 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 first covering part 80 may be molded using any molding method, or may be manufactured by cutting.
• the resin material contained in the material constituting the first covering part 80 is preferably an olefin-based random copolymer, more preferably a resin containing a polyolefin skeleton as its main component, even more preferably a polyolefin as its main component, and even more preferably a polypropylene as its main component.
• the polyolefin may be an acid-modified polyolefin.
• the resin material contained in the material constituting the first covering part 80 preferably contains multiple types of amide-based lubricants. Furthermore, the resin material contained in the material constituting the first covering part 80 preferably contains, in addition to saturated fatty acid amide, multiple types of amide-based lubricants that further contain unsaturated fatty acid amide.
• the resin material contained in the material constituting the first covering part 80 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 first coated part 80 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 first covering part 80 may be a film or a resin molded product.
• the first covering part 80 is described as a resin molded product, this does not include a configuration in which the first covering part 80 is composed solely of a film as defined by the JIS (Japanese Industrial Standards) "Packaging Terminology" standard.
• the first covering part 80 includes a storage portion 80A and a flange portion 80B.
• the storage portion 80A is stored in the internal space 73 of the base part 70.
• the storage portion 80A has a main portion 81, a wall portion 82, and an internal space 83.
• the first covering part 80 may or may not be joined to the base part 70.
• the first covering part 80 may omit the flange portion 80B. In other words, the first covering part 80 may be composed of only the storage portion 80A.
• the outer shape of the main portion 81 can be selected arbitrarily as long as it can cover at least a portion of the first surface 71A of the base part 70.
• the outer shape of the main portion 81 is rectangular.
• the outer shape of the main portion 81 may also be circular, elliptical, square, triangular, or a polygon with pentagons or more sides.
• the main portion 81 has a first surface 81A and a second surface 81B.
• the first surface 81A faces the electrode body 20.
• the second surface 81B is the surface opposite the first surface 81A in the FB direction.
• the second surface 81B faces the first surface 71A of the base part 70.
• the main portion 81 has a hole 81Z that penetrates the first surface 81A and the second surface 81B.
• the electrode terminal 30 is inserted into the hole 81Z.
• the wall portion 82 protrudes from the outer peripheral edge of the main portion 81. In the example shown in Figure 5 etc., the wall portion 82 protrudes from the outer peripheral edge of the main portion 81 towards the electrode body 20 in the FB direction.
• the wall portion 82 has a first wall surface 82X and a second wall surface 82Y.
• the first wall surface 82X is the surface that contacts the second wall surface 72Y of the base part 70.
• the second wall surface 82Y is the surface opposite the first wall surface 82X.
• the wall portion 82 includes a first wall portion 82A, a second wall portion 82B, a third wall portion 82C, and a fourth wall portion 82D.
• the first wall portion 82A extends along the first wall portion 72A.
• the second wall portion 82B and the third wall portion 82C are connected to the first wall portion 82A and the fourth wall portion 82D.
• the second wall portion 82B extends along the second wall portion 72B.
• the third wall portion 82C extends along the third wall portion 72C.
• the fourth wall portion 82D extends along the fourth wall portion 72D.
• the thicknesses of the first to fourth wall portions 82A to 82D are substantially constant in the FB direction.
• the thicknesses of the first to fourth wall portions 82A to 82D may vary in the FB direction.
• at least one of the first to fourth wall portions 82A to 82D may have a tapered shape in which the thickness increases or decreases in the FB direction as it approaches the electrode body 20. If the first to fourth wall portions 82A to 82D have a tapered shape, from the viewpoint of suppressing an increase in the internal pressure of the outer casing 40, it is preferable that the tapered shape be a tapered shape in which the thickness increases as it approaches the electrode body 20.
• the first and fourth wall portions 82A and 82D, which are longer in the LR direction, of the wall portions 82 have a constant thickness in the FB direction, in other words, do not have a tapered shape.
• the thickness of the first wall portion 82A and the fourth wall portion 82D is the thickness in the UD direction.
• the thickness of the second wall portion 82B and the third wall portion 82C is the thickness in the LR direction.
• the wall portion 82 further includes boundaries 82E, 82F, 82G, and 82H.
• Boundary 82E is the boundary between the first wall portion 82A and the second wall portion 82B.
• Boundary 82F is the boundary between the first wall portion 82A and the third wall portion 82C.
• Boundary 82G is the boundary between the fourth wall portion 82D and the second wall portion 82B.
• Boundary 82H is the boundary between the fourth wall portion 82D and the third wall portion 82C.
• the shapes of the boundaries 82E-82H may be angular, or may be rounded by applying a rounded edge. In this embodiment, the boundaries 82E-82H are angular. If the shapes of the boundaries 82E-82H are rounded, it is preferable that the radius of curvature of the boundaries 82E-82H be in the range of more than 0 mm and less than or equal to 2.0 mm.
• the internal space 83 is defined by the first surface 81A of the main portion 81 and the second wall surface 82Y of the wall portion 82.
• the flange portion 80B protrudes from the end face of the wall portion 82 opposite the main portion 81 in the FB direction.
• the flange portion 80B covers the end face of the wall portion 72 of the base part 70 opposite the main portion 71 in the FB direction.
• the thickness of the first covering part 80 is preferably 1.0 mm or more, from the viewpoint of preventing deformation of the lid body 60 when an external force is applied to the lid body 60. If the first covering part 80 is a resin molded product, the thickness of the first covering part 80 is preferably 3.0 mm or less, from the viewpoint of reducing the weight of the lid body 60. If the first covering part 80 is a resin molded product, the preferred range of the thickness of the first covering part 80 is 1.0 mm or more and 3.0 mm or less. Note that if the thickness of the first covering part 80 varies depending on the portion, the thickness of the first covering part 80 is the thickness of the thickest portion.
• the thicknesses of the first wall portion 82A and the fourth wall portion 82D are the thickness in the UD direction.
• the thicknesses of the second wall portion 82B and the third wall portion 82C are the thickness in the LR direction.
• the thickness of the main portion 81 and the flange portion 80B are the thickness in the FB direction.
• the second covering part 90 covers at least a portion of the second surface 71B of the base part 70. In this embodiment, the second covering part 90 covers the entire second surface 71B. The second covering part 90 is joined to the base part 70.
• the second covering part 90 is made of a resin material.
• the definition of "made of a resin material" for the second covering part 90 is the same as for the first covering part 80.
• the specifications of the resin material contained in the material constituting the second covering part 90 are the same as those of the resin material contained in the material constituting the first covering part 80.
• the second covering part 90 may be a film or a resin molded product. When the second covering part 90 is referred to as a resin molded product, this does not include a form in which the second covering part 90 is made solely of a film as defined by the JIS (Japanese Industrial Standards) "Packaging Terminology" standard.
• the resin material contained in the material constituting the first covering part 80 and the resin material contained in the material constituting the second covering part 90 may be the same or different.
• the resin material constituting the second covering part 90 is resin
• the second covering part 90 may be molded using any molding method, or may be manufactured by cutting.
• the second covering part 90 has a shape similar to the base part 70.
• the second covering part 90 has a main part 91, a wall part 92, and an internal space 93.
• the outer shape of the main portion 91 can be selected arbitrarily as long as it can cover at least a portion of the second surface 71B of the base part 70.
• the outer shape of the main portion 91 is rectangular.
• the outer shape of the main portion 91 may also be circular, elliptical, square, triangular, or a polygon with pentagons or more sides.
• the main portion 91 has a first surface 91A and a second surface 91B.
• the first surface 91A faces the second surface 71B of the base part 70.
• the second surface 91B is the surface opposite the first surface 91A in the FB direction.
• the second surface 91B faces the external space.
• the lid body 60 may be arranged so that the first surface 91A faces the external space, in other words, so that the second surface 91B faces the electrode body 20.
• the main portion 91 has a hole 91Z formed therein, penetrating the first surface 91A and the second surface 91B.
• the electrode terminal 30 is inserted into the hole 91Z.
• the wall portion 92 protrudes from the outer peripheral edge of the main portion 91 so as to cover the first wall surface 72X of the wall portion 72 of the base part 70.
• the wall portion 92 has a first wall surface 92X and a second wall surface 92Y.
• the first wall surface 92X is the surface that is joined to the heat-sealable resin layer 53 of the exterior film 50.
• the second wall surface 92Y is the surface opposite the first wall surface 92X.
• the second wall surface 92Y covers the second wall surface 72Y of the wall portion 72 of the base part 70.
• the wall portion 92 includes a first wall portion 92A, a second wall portion 92B, a third wall portion 92C, and a fourth wall portion 92D.
• the first wall portion 92A forms the upper surface of the lid body 60.
• the first wall portion 92A extends along the first wall portion 72A of the base part 70.
• the second wall portion 92B and the third wall portion 92C are connected to the first wall portion 92A and the fourth wall portion 92D, and form the side surfaces of the lid body 60.
• the second wall portion 92B extends along the second wall portion 72B of the base part 70.
• the third wall portion 93C extends along the third wall portion 72C of the base part 70.
• the fourth wall portion 92D extends along the fourth wall portion 72D of the base part 70.
• the thicknesses of the first to fourth wall portions 92A to 92D are substantially constant in the FB direction.
• the thicknesses of the first to fourth wall portions 92A to 92D may vary in the FB direction.
• at least one of the first to fourth wall portions 92A to 92D may have a tapered shape in which the thickness increases or decreases in the FB direction as it approaches the electrode body 20. If the first to fourth wall portions 92A to 92D have a tapered shape, from the viewpoint of suppressing an increase in the internal pressure of the outer casing 40, it is preferable that the tapered shape be a tapered shape in which the thickness increases as it approaches the electrode body 20.
• the first and fourth wall portions 92A and 92D, which are longer in the LR direction, of the wall portions 92 have a constant thickness in the FB direction, in other words, do not have a tapered shape.
• the thickness of the first wall portion 92A and the fourth wall portion 92D is the thickness in the UD direction.
• the thickness of the second wall portion 92B and the third wall portion 92C is the thickness in the LR direction.
• the wall portion 92 further includes boundaries 92E, 92F, 92G, and 92H.
• the boundary 92E is the boundary between the first wall portion 92A and the second wall portion 92B.
• the boundary 92F is the boundary between the first wall portion 92A and the third wall portion 92C.
• the boundary 92G is the boundary between the fourth wall portion 92D and the second wall portion 92B.
• the boundary 92H is the boundary between the fourth wall portion 92D and the third wall portion 92C.
• the boundaries 92E-92H may be angular in shape, or may be rounded by applying a rounded edge. In this embodiment, the boundaries 92E-92H are angular. If the boundaries 92E-92H are rounded, the radius of curvature of the boundaries 92E-92H is preferably in the range of more than 0 mm and less than or equal to 2.0 mm.
• the end face of the wall portion 92 opposite the main portion 91 in the FB direction comes into contact with the flange portion 80B of the first covering part 80. Therefore, the boundary 60X between the first covering part 80 and the second covering part 90 can be confirmed in the lid body 60.
• the boundary 60X can be observed using a scanning electron microscope or a scanning transmission electron microscope. Even if the resin material contained in the material constituting the first covering part 80 and the resin material contained in the material constituting the second covering part 90 are the same material, the sea-island shape or lamellar shape at the boundary 60X is different, so the boundary 60X is observed using a scanning electron microscope or a scanning transmission electron microscope.
• sea-island shapes includes cases where the same components are used but the shape differs only due to differences in the vertical or horizontal dimensions of the sea-island shapes.
• “Different lamellar shapes” includes cases where the lamellae are discontinuous or have different orientations, even if the dimensions such as thinness and length of the lamellae are the same.
• the internal space 93 is defined by the first surface 91A of the main portion 91 and the second wall surface 92Y of the wall portion 92.
• the internal space 93 accommodates the entire base part 70 and part of the first covering part 80.
• the flange portion 80B of the first covering part 80 is exposed from the internal space 93.
• the thickness of the second covering part 90 can be selected as desired. Whether the second covering part is a film or a resin molded product, the thickness of the second covering part 90 is preferably 50 ⁇ m or more in order to ensure good bonding with the exterior film 50. Whether the second covering part is a film or a resin molded product, the thickness of the second covering part 90 is preferably 2.0 mm or less in order to reduce the weight of the lid body 60. A preferred range for the thickness of the second covering part 90 is 50 ⁇ m or more and 2.0 mm or less. Note that if the thickness of the second covering part 90 varies depending on the region, the thickness of the second covering part 90 is the thickness of the thickest portion.
• the thicknesses of the first wall portion 92A and the fourth wall portion 92D are measured in the UD direction.
• the thicknesses of the second wall portion 92B and the third wall portion 92C are measured in the LR direction.
• the thickness of the main portion 91 is measured in the FB direction.
• the method for manufacturing the lid body 60 can be selected arbitrarily. An example of a method for manufacturing the lid body 60 is described below.
• the manufacturing method of the lid body 60 includes a first injection molding process and a second injection molding process.
• a first covering part 80 is injection molded onto a base part 70.
• the object obtained by injection molding the first covering part 80 onto the base part 70 corresponds to the lid unit 130.
• a second covering part 90 is injection molded onto the lid unit 130.
• the amount of resin used in the first injection molding process is smaller than when the first covering part 80 and the second covering part 90 are injection molded onto the base part 70 at once. Therefore, even if the thickness of the base part 70 is thin, deformation of the base part 70 is suppressed in the first injection molding process and the second injection molding process.
• a burr 100X may form in the portion of the flange portion 80B of the first covering part 80 that does not cover the end face of the wall portion 72 of the base part 70.
• the burr 100X is covered by the second covering part 90 or is integrated with the second covering part 90. This prevents the burr 100 from coming into contact with elements such as the electrode body 20 located inside the exterior body 40.
• the manufacturing method for the lid body 60 includes a first injection molding process and a second injection molding process.
• the first injection molding process the second covering part 90 is injection molded onto the base part 70.
• the object in which the second covering part 90 is injection molded onto the base part 70 corresponds to the lid unit 230 (see Figure 8B).
• the first covering part 80 is injection molded onto the lid unit 230.
• the amount of resin used in the first injection molding process is smaller than when the first covering part 80 and the second covering part 90 are injection molded onto the base part 70 at the same time. Therefore, even if the thickness of the base part 70 is thin, deformation of the base part 70 is suppressed in the first injection molding process and the second injection molding process.
• the lid body 60 be manufactured by the manufacturing method in the second example. Furthermore, in the second example, the base part 70, which is easily deformed by resin pressure, is held down by the mold in the first injection molding process, so deformation of the base part 70 is suppressed even when the second covering part 90 is injection molded.
• the base part 70, the first covering part 80, and the second covering part 90 are manufactured separately and then combined.
• the first covering part 80 and the second covering part 90 may be manufactured in the same molding machine.
• the first covering part 80 and the second covering part 90 are not injection molded onto the base part 70, which prevents the base part 70 from deforming during the lid 60 manufacturing process.
• the thickness of the base part 70 is 2.0 mm or less, it is preferable that the lid 60 be manufactured using the manufacturing method in the third example.
• the base part 70, the first covering part 80, and the second covering part 90, which are manufactured separately, correspond to a lid kit 140 (see Figures 4 to 6).
• 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 on the exterior body 40 where the first sealed portion 100A is formed can be selected arbitrarily.
• the root 100AX of the first sealed portion 100A is 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 sealing 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 first wall surface 92X of the second covering part 90.
• the seal strength between the heat-sealable resin layer 53 of the exterior film 50 and the first wall surface 92X of the second covering part 90 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 first wall surface 92X, i.e., the first wall surface 92X 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 (the direction opposite to the first surface 41B) to measure 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 sealing strength of the second sealing portion 100B is the sealing strength of the long side portions of the first wall surfaces 92X 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.
• Manufacturing method of electricity storage device> 9 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.
• the manufacturing equipment places a pair of lid bodies 60 on either side of the electrode body 20 in the FB direction.
• step S12 is performed after the first process.
• the manufacturing equipment joins the electrode terminal 30 connected to the electrode body 20 to the lid body 60.
• the lid body 60 with the electrode terminal 30 joined thereto may be placed in the first process, and the electrode terminal 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 terminals 30 connected thereto may be housed inside a cylindrical exterior film 50 configured to have openings 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 with the electrode terminals 30 connected to the lid 60 may be housed inside a cylindrical exterior film 50 configured to have openings at both ends in the FB direction, and the opening may be closed by the lid 60.
• the fourth step of step S14 is performed after the third step.
• the manufacturing device heat-seals the exterior film 50 and the first wall surface 82X of the lid body 60 to form the second sealed portion 110B.
• 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 lid body 60 includes a base part 70, a first covering part 80, and a second covering part 90. Because the first covering part 80 and the second covering part 90 are separate parts, the first covering part 80 and the second covering part 90 are not simultaneously injection molded onto the base part 70 during the manufacturing process of the lid body 60. This prevents the lid body 60 from being deformed during the manufacturing process of the lid body 60.
• the above-described embodiments are examples of possible forms of the lid, electricity storage device, lid kit, lid unit, base part, first covering part, second covering part, and electricity storage device manufacturing method of the present invention, and are not intended to limit the forms.
• the lid, electricity storage device, lid kit, lid unit, base part, first covering part, second covering part, and electricity storage device manufacturing method of 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 new configurations are 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.
• Fig. 10 is a cross-sectional view of lid 160 of a first modified example. As shown in Fig. 10, main portion 91 of second covering part 90 does not have to cover a portion of second surface 71B of base part 70.
• FIG. 11 is a cross-sectional view of a cover body 260 of a second modified example.
• the main portion 81 of the first covering part 80 may not cover a portion of the first surface 71A of the base part 70.
• the main portion 91 of the second covering part 90 may not cover a portion of the second surface 71B of the base part 70.
• the first surface 71A and the second surface 71B of the base part 70 are exposed.
• the exposed portion of the first surface 71A of the base part 70 may be connected to the electrode body 20.
• the exposed portion of the second surface 71B of the base part 70 may be connected to an external device.
• the base part 70 also functions as the electrode terminal 30, so the electrode terminal 30 can be omitted.
• the electrode terminal 30 may be joined to the portion of the second surface 71B that is not covered by the second covering part 90.
• Third Modified Example> 12 is a cross-sectional view of a lid 360 of a third modified example.
• the base part 70 may have a flange part 74 that connects to the wall part 72.
• An edge 74A of the flange part 74 may be sandwiched between the first covering part 80 and the second covering part 90.
• the first covering part 80 and the second covering part 90 do not contact each other.
• the electrode terminal 30 may protrude outside the exterior body 40 from between the first wall surface 91X of the second covering part 90 and the exterior film 50.
• an adhesive film that can be suitably bonded to metal and resin is preferably disposed between the first wall surface 91X and the electrode terminal 30 and between the electrode terminal 30 and the exterior film 50.
• the electrode terminal 30 is preferably plate-shaped.
• the hole 71Z of the base part 70, the hole 81Z of the first covering part 80, and the hole 91Z of the second covering part 90 may be omitted.
• the fourth modified example can be similarly applied to the first to third modified examples.
• the shape of the base part 70 can be changed as desired.
• the base part 70 may be, for example, cylindrical.
• one side of an imaginary line that coincides with the radius of the circle of the end face can be defined as a first surface, and the other side can be defined as a second surface.
• the exterior film 50 of the power storage device 10 may protrude outward in the FB direction beyond at least one of the two lid bodies 60.
• the electrode body 20 is sealed by closing the portion of the exterior film 50 that protrudes outward beyond the lid body 60.
• the portion of the exterior film 50 that protrudes 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 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 40 Exterior body 50: Exterior film 60, 260, 360: Lid body 70: Base part 71: Main part 71A: First surface 71B: Second surface 72: Wall part 73: Internal space 74A: Edge 80: First covering part 80A: Storage part 90: Second covering part 130, 230: Lid unit 140: Lid body kit

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