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
  • 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
  • H01M50/147—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
  • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
  • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
• • 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, 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 assembly and an exterior body that seals the electrode assembly.
• the exterior body has an exterior film that encases the electrode assembly and a lid that is joined to the exterior film.
• the lid if the lid is deformed, for example, the lid and the exterior film cannot be properly bonded, and the sealing performance of the exterior may be reduced.
• deformation of the lid can occur, for example, when an external force is applied to the lid, or due to molding defects when the lid is manufactured by injection molding.
• the present invention aims to provide a lid body that is suppressed from deforming, an electricity storage device that includes this lid body, and a method for manufacturing this electricity storage device.
• the lid according to a first aspect of the present invention is a lid that constitutes the exterior of an electricity storage device, and includes a base, a wall that protrudes from the base, and a rib that extends from one of the base and the wall toward the other.
• a lid according to a second aspect of the present invention is the lid according to the first aspect, wherein the rib contacts the base and the wall.
• a lid according to a third aspect of the present invention is a lid according to the first or second aspect, wherein the rib is joined to at least one of the base and the wall.
• 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 wall portion has a first wall surface that is joined to an exterior film that is an element constituting the exterior body, and a second wall surface opposite the first wall surface, and the rib extends from the base and one of the second wall surfaces toward the other.
• 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 base has an output section containing a conductive material, and a covering section containing a resin material that covers a portion of the output section.
• the sixth aspect of the present invention relates to an electricity 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 seals the electrode body together with the exterior film.
• the lid has a base, a wall that protrudes from the base and is joined to the exterior film, and a rib that extends from one of the base and the wall to the other.
• a seventh aspect of the present invention relates to a method for manufacturing an electricity storage device, which includes an electrode assembly and an exterior body that seals the electrode assembly, the exterior body having an exterior film that wraps the electrode assembly and a lid that seals the electrode assembly together with the exterior film, and the lid body having a base, a wall that protrudes from the base and is joined to the exterior film, and a rib that extends from one of the base and the wall to the other.
• the method for manufacturing the electricity storage device includes a step of placing the lid body on the electrode assembly.
• the lid, electricity storage device, 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 lid provided in the electricity storage device of FIG. 1A.
• 1B is a cross-sectional view taken along line D5-D5 in 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 provided in an electricity storage device according to a first modified example.
• FIG. 11 is a cross-sectional view of a lid provided in an electricity storage device according to a second modified example.
• FIG. 11 is a cross-sectional view of a lid provided in an electricity storage device according to a third modified example.
• FIG. 11 is a cross-sectional view of a lid provided in an electricity storage device according to a fourth modified example.
• FIG. 13 is a cross-sectional view of a lid provided in another example of the electricity storage device according to the fourth modified example.
• FIG. 13 is a cross-sectional view of a base portion of a lid body included in an electricity accumulation device according to a fifth modified example.
• FIG. 1A is a plan view schematically illustrating an electric 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 electric 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 electric storage device 10 of FIG. 1A.
• FIG. 3 is a diagram illustrating the exterior film 50 included in the electric storage device 10 of FIG. 1A in an unfolded state.
• FIG. 4 is a perspective view of a lid body 60 included in the electric storage device 10 of FIG. 1A.
• FIG. 5 is a cross-sectional view taken along line D5-D5 in FIG. 1A.
• the direction of arrow UD indicates the thickness direction of the electric storage device 10
• the direction of arrow LR indicates the width direction of the electric storage device 10
• the direction of arrow FB indicates the depth direction of the electric storage device 10.
• the directions indicated by the arrows UDLRFB are common to the subsequent figures.
• the energy storage device 10 comprises an electrode body 20 including a current collector 30 and an outer casing 40.
• the electrode body 20 includes electrodes (positive and negative electrodes) and a separator constituting 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, polycation battery, or capacitor.
• the electrode body 20 has a substantially rectangular parallelepiped shape.
• substantially rectangular parallelepiped includes not only a perfect rectangular parallelepiped, but also a solid that can be considered a rectangular parallelepiped by modifying the shape of a portion of its outer surface, for example.
• the electrode body 20 may have a cylindrical or polygonal prism shape, for example.
• One end 31 of the current collector 30 (see FIG. 5) is connected to the output section 71 of the lid 60, which 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, for example, 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 H4160:1994A8021H-H18, JIS H4160:1994A8079H-H18, JIS H4000:2014A8021P-H14, or JIS H4000:2014A8079P-H14.
• the aluminum alloy foil is preferably an aluminum alloy foil containing magnesium.
• the magnesium content is preferably 0.2 to 5.6% by mass, and more preferably 0.2 to 3.0% by mass.
• Examples of aluminum alloy foils containing magnesium include aluminum alloy foils having compositions specified in JIS H4000:2017 A5005P-O, JIS H4000:2017 A5050P-O, and JIS H4000:2017 A5052P-O.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. 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 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 70, a wall portion 80, and a rib 90.
• the outer shape of the base 70 can be selected arbitrarily as long as it can seal the electrode body 20. In the example shown in Figure 4, etc., the outer shape of the base 70 is rectangular. The outer shape of the base 70 may also be circular, elliptical, square, triangular, or a polygon with pentagons or more sides.
• the base 70 has a first surface 70A and a second surface 70B.
• the first surface 70A faces the external space.
• the second surface 70B is the surface opposite the first surface 70A in the FB direction.
• the second surface 70B faces the electrode body 20.
• the lid 60 may be positioned so that the first surface 70A faces the electrode body 20, in other words, so that the second surface 70B faces the external space.
• the base 70 includes an output section 71 and a covering section 72.
• the output unit 71 is an element that outputs power to an external device.
• the output unit 71 is connected to one end 31 of the current collector 30.
• the outer shape of the output unit 71 can be selected arbitrarily. In the example shown in Figure 4, etc., the outer shape of the output unit 71 is rectangular.
• the output section 71 is composed of a conductive material.
• “Composed of a conductive material” means that, when the entire material constituting the output section 71 is taken as 100% by mass, the content of 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 output section 71 can contain materials other than conductive materials in addition to conductive materials.
• the output section 71 composed of a conductive material preferably has the corrosion-resistant coating described for the barrier layer 52.
• the conductive material that makes up the output unit 71 is, for example, a metal material.
• the metal material that makes up the output unit 71 is, for example, aluminum, aluminum alloy, nickel, copper, or a copper alloy.
• the output unit 71 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the output unit 71 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material that makes up the output unit 71 connected to the negative electrode may be copper plated with nickel.
• the material that makes up the output unit 71 may also include recycled metal materials.
• the covering portion 72 covers a portion of the output portion 71. In the example shown in FIG. 4 etc., the covering portion 72 covers the entire outer periphery of the output portion 71.
• the outer shape of the covering portion 72 can be selected arbitrarily. In the example shown in FIG. 4 etc., the outer shape of the covering portion 72 is rectangular.
• a through-hole 72X is formed in the center of the covering portion 72, penetrating the first surface 70A and the second surface 70B.
• the covering portion 72 is composed of a resin material.
• “composed of a resin material” means that, when the entire material constituting the covering portion 72 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 covering portion 72 can contain materials other than the resin material in addition to the resin material.
• resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and 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.
• heat-sealable resins such as polyester and polyolefin are preferred, with polyolefin being more preferred.
• the covering portion 72 may be molded using any molding method, or may be manufactured by cutting.
• the resin material contained in the material constituting the covering portion 72 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 covering portion 72 preferably contains multiple types of amide-based lubricants. Furthermore, the resin material contained in the material constituting the covering portion 72 preferably contains, in addition to saturated fatty acid amides, multiple types of amide-based lubricants that further contain unsaturated fatty acid amides.
• the resin material contained in the material constituting the covering portion 72 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 covering portion 72 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 thickness of the output section 71 in the FB direction and the thickness of the covering section 72 can be selected arbitrarily.
• the thickness of the output section 71 in the FB direction may be thicker than the thickness of the covering section 72, may be thinner than the thickness of the covering section 72, or may be equal to the thickness of the covering section 72.
• the thickness of the output section 71 in the FB direction is substantially equal to the thickness of the covering section 72 in the FB direction.
• the first surface 70A of the output section 71 and the first surface 70A of the covering section 72 are flush with each other.
• the second surface 70B of the output section 71 and the second surface 70B of the covering section 72 are flush with each other.
• the wall portion 80 protrudes from the outer peripheral edge of the covering portion 72.
• the direction in which the wall portion 80 protrudes can be selected arbitrarily. In the example shown in Figure 5 etc., the wall portion 80 protrudes from the outer peripheral edge of the covering portion 72 towards the electrode body 20 in the FB direction.
• the wall portion 80 may also protrude from the outer peripheral edge of the covering portion 72 in the opposite direction to the electrode body 20, in other words towards the external space, in the FB direction.
• the wall portion 80 may also protrude from the outer peripheral edge of the covering portion 72 in a direction intersecting the FB direction when viewed from the side of the lid body 60.
• the wall portion 80 is preferably made up of a resin material.
• the definition of "made up of a resin material” with respect to the wall portion 80 is the same as the definition of "made up of a resin material” with respect to the covering portion 72.
• the resin material contained in the material that makes up the wall portion 80 can be any of the resin materials exemplified as being contained in the material that makes up the covering portion 72. From the perspective of easily molding the lid body 60, it is preferable that the resin material contained in the material that makes up the wall portion 80 and the resin material contained in the material that makes up the covering portion 72 are the same.
• the wall portion 80 has a first wall surface 80A and a second wall surface 80B.
• the first wall surface 80A is the surface that is joined to the exterior film 50.
• the first wall surface 80A is joined by heat sealing to the heat-fusible resin layer 53 of the exterior film 50.
• the first wall surface 80A may also be joined to the exterior film 50 with an adhesive.
• the second wall surface 80B is the surface opposite the first wall surface 80A.
• the wall portion 80 includes a first joint wall 81, a second joint wall 82, a third joint wall 83, and a fourth joint wall 84.
• the first joint wall 81 forms the upper surface of the lid body 60.
• the first joint wall 81 extends in a first direction (in this embodiment, the LR direction) when viewed from the front of the lid body 60.
• the second joint wall 82 and the third joint wall 83 are connected to the first joint wall 81 and form the side surfaces of the lid body 60.
• the second joint wall 82 and the third joint wall 83 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 60.
• the first direction and the second direction are orthogonal when viewed from the front of the lid body 60.
• the first direction and the second direction do not have to be orthogonal when viewed from the front of the lid body 60.
• the fourth joint wall 84 forms the lower surface of the lid body 60.
• the fourth joint wall 84 extends in the first direction (the LR direction in this embodiment) when the lid 60 is viewed from the front.
• the thicknesses of the first to fourth joint walls 81 to 84 are substantially constant in the FB direction.
• the thicknesses of the first to fourth joint walls 81 to 84 may vary in the FB direction.
• at least one of the first to fourth joint walls 81 to 84 may have a tapered shape in the FB direction that increases in thickness toward the electrode body 20, or may have a tapered shape that decreases in thickness. If the first to fourth joint walls 81 to 84 have a tapered shape, from the viewpoint of suppressing an increase in internal pressure of the exterior body 40, it is preferable that the tapered shape increase in thickness toward the electrode body 20.
• the first and fourth joint walls 81 and 84 which are longer in the LR direction among the wall portions 80, have a constant thickness in the FB direction, in other words, not have a tapered shape.
• the wall portion 80 further includes boundaries 85, 86, 87, and 88.
• Boundary 85 is the boundary between the first joining wall 81 and the second joining wall 82.
• Boundary 86 is the boundary between the first joining wall 81 and the third joining wall 83.
• Boundary 87 is the boundary between the fourth joining wall 84 and the second joining wall 82.
• Boundary 88 is the boundary between the fourth joining wall 84 and the third joining wall 83.
• the shapes of the boundaries 85-88 may be angular, or may be rounded by applying a rounded edge. In this embodiment, the boundaries 85-88 are angular. If the shapes of the boundaries 85-88 are rounded, it is preferable that the radius of curvature of the boundaries 85-88 be in the range of more than 0 mm and 0.5 mm or less.
• the lid body 60 has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the energy storage devices 10 are placed one on top of the other.
• the minimum thickness of the covering portion 72 and wall portion 80 of the lid body 60 is, for example, 0.3 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum thickness of the covering portion 72 and wall portion 80 of the lid body 60 is, for example, 20 mm, more preferably 15 mm, more preferably 10 mm, and even more preferably 7.0 mm.
• the maximum thickness of the covering portion 72 and wall portion 80 of the lid body 60 may be 20 mm or more.
• Preferred thickness ranges for the covering portion 72 and wall portion 80 of the lid body 60 are 0.3 mm to 20 mm, 0.3 mm to 15 mm, 0.3 mm to 10 mm, 0.3 mm to 7.0 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 10 mm, 3.0 mm to 7.0 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, 4.0 mm to 10 mm, and 4.0 mm to 7.0 mm.
• This embodiment does not include embodiments in which the covering portion 72 and wall portion 80 are composed solely of a film as defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the thicknesses of the covering portion 72 and wall portion 80 of the lid body 60 may vary depending on the location. For example, if the thickness of the covering portion 72 of the lid body 60 varies depending on the location, the thickness of the covering portion 72 of the lid body 60 is the thickness of the thickest portion of the covering portion 72. For example, if the thickness of the wall portion 80 of the lid body 60 varies depending on the location, the thickness of the wall portion 80 of the lid body 60 is the thickness of the thickest part of the wall portion 80.
• the rib 90 extends from one of the base 70 and the wall 80 to the other. From the viewpoint of effectively suppressing deformation of the lid 60, it is preferable that the rib 90 extend from one of the second surface 70B of the base 70 and the second wall surface 80B of the wall 80 to the other. The rib 90 may extend from one of the second surface 70B of the base 70 and any point on the wall 80 to the other. From the viewpoint of effectively suppressing deformation of the lid 60, it is preferable that the rib 90 be in contact with the base 70 and the wall 80. The rib 90 does not have to be in contact with the base 70 or the wall 80.
• the rib 90 be joined to at least one of the base 70 and the wall 80.
• the rib 90 does not have to be joined to the base 70 or the wall 80.
• the rib 90 is joined to the base 70 and the wall 80.
• the number of ribs 90 on one lid body 60 can be selected arbitrarily.
• one lid body 60 has 16 ribs 90.
• the second wall surface 80B of the first joint wall 81 and the second surface 70B of the covering portion 72 are connected by five ribs 90.
• the second wall surface 80B of the second joint wall 82 and the second surface 70B of the covering portion 72 are connected by three ribs 90.
• the second wall surface 80B of the third joint wall 83 and the second surface 70B of the covering portion 72 are connected by three ribs 90.
• the second wall surface 80B of the fourth joint wall 84 and the second surface 70B of the covering portion 72 are connected by five ribs 90.
• the ribs 90 may extend from one side of the wall portion 80 and the second surface 70B of the output portion 71 to the other.
• One lid 60 may have 1 to 15, or 17 or more, ribs 90.
• the spacing between adjacent ribs 90 can be selected as desired. From the perspective of effectively suppressing deformation of the lid body 60, the spacing between adjacent ribs 90 is preferably 15 mm or less, and more preferably 10 mm or less.
• the rib 90 When the rib 90 extends from the second wall surface 80B, the rib 90 can be formed at any position on the second wall surface 80B. From the standpoint of formability of the lid body 60, it is preferable that the rib 90 not be formed at the corners of the boundary of the second wall surface 80B of the continuous wall portion 80.
• the shape of the rib 90 can be selected arbitrarily as long as it is a shape that can suppress deformation of the lid body 60.
• the shape of the rib 90 is a triangular plate.
• any one side of the rib 90 is entirely joined to the second wall surface 80B of the wall portion 80.
• Any other one side of the rib 90 is entirely joined to the second surface 70B of the covering portion 72.
• the shape of the rib 90 may be a circular plate, an elliptical plate, a rectangular plate, or a polygonal plate with pentagons or more sides.
• the shapes of the multiple ribs 90 may be the same, or at least one of the ribs 90 may be different.
• the thickness of the rib 90 can be selected arbitrarily as long as it is thick enough to suppress deformation of the lid body 60. From the perspective of formability of the lid body 60, it is preferable that the thickness of the rib 90 be thinner than the thickness of the wall portion 80.
• the thickness of the rib 90 is preferably no more than two-thirds, and more preferably no more than half, of the thickness of the wall portion 80. If the thickness of the rib 90 is thinner than the thickness of the wall portion 80, deformation of the wall portion 80 during manufacture of the lid body 60 can be suppressed. Since unevenness is less likely to form on the first wall surface 80A of the lid body 60, adhesion between the lid body 60 and the exterior film 50 is improved.
• the thickness of the rib 90 provided on the first joint wall 81 or the fourth joint wall 84 is the thickness in the LR direction.
• the thickness of the rib 90 provided on the second joint wall 82 or the third joint wall 83 is the thickness in the UD direction.
• the method for manufacturing the lid 60 can be selected arbitrarily.
• the lid 60 may be manufactured by injection molding the covering portion 72, wall portion 80, and rib 90 onto the output portion 71.
• the covering portion 72 may be injection molded onto the output portion 71, and the wall portion 80 and rib 90 may be joined.
• the covering portion 72 and wall portion 80 may be injection molded onto the output portion 71, and the rib 90 may be joined.
• the output portion 71 may be placed in the through-hole 72X, and the output portion 71 and covering portion 72 may be joined. At least one of the output portion 71, covering portion 72, wall portion 80, and rib 90 may be manufactured by cutting.
• 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 section 100A may be folded, for example, toward the second surface 42 of the exterior body 40, or toward the first surface 41.
• the second sealed portion 100B is formed by heat-sealing the heat-sealable resin layer 53 of the exterior film 50 to the first wall surface 80A of the lid body 60.
• the seal strength between the heat-sealable resin layer 53 of the exterior film 50 and the first wall surface 80A of the lid body 60 may be referred to as the seal strength (bonding strength) of the second sealed portion 100B.
• the seal strength of the second sealed 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 80A, i.e., the first wall surface 80A extending in the LR (width) direction in Figure 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 80A 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> 6 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 The second process of step S12 is performed after the first process.
• the manufacturing equipment joins the current collector 30 and the output portion 71 of the lid 60.
• 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 may be housed inside a cylindrical exterior film 50 that has openings at both ends in the FB direction, and after the current collector 30 and output section 71 are joined, the opening may be closed with the lid 60.
• the electrode body 20 connected to the output section 71 of the lid 60 may be housed inside a cylindrical exterior film 50 that has openings at both ends in the FB direction, and the opening may be closed with the lid 60.
• step S14 is performed after the third step.
• the manufacturing device heat-seals the exterior film 50 and the first wall surface 80A 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 power storage device 10 includes a lid 60.
• the lid 60 has a rib 90 extending from one of the base 70 and the wall 80 to the other. Therefore, the lid 60 suppresses deformation of either the base 70 or the wall 80 relative to the other.
• the above-described embodiments are examples of possible forms of the lid body, the electricity storage device, and the method for manufacturing the electricity storage device according to the present invention, and are not intended to limit the forms.
• the lid body, the electricity storage device, and the method for manufacturing the electricity storage device according to the present invention may take forms different from those exemplified in the embodiments. Examples of such forms include forms in which part of the configuration of the embodiments is replaced, changed, 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.
• Fig. 7 is a cross-sectional view of a lid 160 provided in the electricity storage device 10 of the first modified example.
• the lid body 160 includes a base 170.
• the lid body 160 may be arranged so that the first surface 70A of the base 170 faces the external space, and the second surface 70B faces the electrode body 20.
• the base 170 may be substantially entirely made of a conductive material.
• FIG. 8 is a cross-sectional view of a lid 260 provided in the electricity storage device 10 of the second modified example.
• the lid 260 has a first element 270 , a second element 280 , and a rib 290 .
• the first element 270 is preferably composed of, for example, a conductive material.
• the first element 270 is preferably connected to one end 31 of the current collector 30 of the electrode body 20.
• the first element 270 has a base 271 and a wall 272.
• the outer shape of the base 271 is, for example, rectangular.
• the wall 272 protrudes from the outer peripheral edge of the base 271 toward the electrode body 20 in the FB direction.
• the wall 272 is preferably composed of, for example, the entire outer peripheral edge of the base 271 toward the electrode body 20 in the FB direction.
• the second element 280 is preferably made of, for example, a resin material.
• the second element 280 covers a portion of the first element 270.
• the second element 280 has a base 281 and a wall 282.
• the base 281 covers part of the first surface 70A and second surface 70B of the base 271, as well as part of the wall 272.
• the wall 282 is connected to the base 281 and covers part of the wall 272.
• the wall 282 protrudes toward the electrode body 20 in the FB direction.
• the rib 290 is preferably made of, for example, a resin material.
• the rib 290 extends from one of the base 281 and the wall 282 to the other. In the example shown in FIG. 8, the rib 290 is joined to the base 281 and the wall 282.
• the lid 260 may be arranged so that the first surface 70A of the base 271 faces the electrode body 20.
• FIG. 9 is a cross-sectional view of a lid 360 provided in the electricity storage device 10 of the third modified example.
• the cover 360 has a first element 370 , a second element 380 , and a rib 390 .
• the first element 370 is preferably made of, for example, a conductive material.
• the first element 370 is preferably connected to one end 31 of the current collector 30 of the electrode body 20.
• the outer shape of the first element 370 is, for example, rectangular.
• the second element 380 is preferably made of, for example, a resin material.
• the second element 380 covers a portion of the first element 370.
• the second element 380 has a base 381 and a wall 382.
• the base 381 covers parts of the first surface 70A and second surface 70B of the first element 370, as well as the outer peripheral edge of the first element 370. It is preferable that the base 381 covers the entire outer peripheral edge of the first element 370.
• the wall portion 382 is connected to the base 381 and protrudes toward the external space in the FB direction.
• the rib 390 is preferably made of, for example, a resin material.
• the rib 390 extends from one of the base 381 and the wall 382 to the other. In the example shown in FIG. 9, the rib 390 is joined to the base 381 and the wall 382.
• the cover 360 may be arranged so that the first surface 70A of the first element 370 faces the electrode body 20.
• FIG. 10 is a cross-sectional view of a lid 460 provided in an electricity storage device 10 according to a fourth modified example.
• the lid 460 has a base 470, a wall 480, and a rib 490.
• the entire lid 460 may be made of, for example, a resin material.
• the outer shape of the base 470 is, for example, rectangular.
• the wall 480 protrudes from the outer periphery of the base 470 toward the external space in the FB direction.
• the rib 490 extends from one side of the base 470 and the wall 480 to the other. In the example shown in FIG. 10, the rib 490 is joined to the base 470 and the wall 480.
• a barrier film 400 having moisture barrier properties may be bonded to at least a portion of the first surface 70A and the second surface 70B of the base 470.
• the barrier film 400 is bonded to substantially the entire second surface 70B of the base 470.
• the barrier film 400 is a film that includes at least a barrier layer 52.
• the barrier film 400 may be bonded to at least a portion of the first wall surface 80A.
• the power storage device 10 preferably has an electrode terminal 400X for outputting power to the outside.
• the electrode terminal 400X is joined to one end 31 of the current collector 30.
• the electrode terminal 400X may be disposed between the first wall surface 80A of the wall 480 and the exterior film 50 (not shown).
• the electrode terminal 400X may be disposed so as to penetrate the base 470 of the lid 460.
• the lid 460 may be disposed so that the first surface 70A of the base 470 faces the electrode body 20.
• the thickness of the base 70 is substantially constant, but the thickness of the base 70 may vary partially.
• the covering portion 72 of the base 70 may include a thin portion 72A and a thick portion 72B.
• the thin portion 72A is formed within a predetermined range from the outer peripheral edge of the base 70. It is preferable that the rib 90 extend from one of the thin portion 72A and the wall portion 80 to the other.
• the entire base 70, the wall 80, and/or the rib 90 may be configured to contain a conductive material.
• the wall 80 is configured to contain a conductive material
• the first wall surface 80A and the exterior film 50 are preferably joined via an adhesive film that is suitably bonded to conductive materials and resin materials.
• the adhesive film is preferably a laminated film having at least a heat-sealable resin layer, a heat-resistant substrate layer, and another heat-sealable resin layer, in that order.
• the specifications for the heat-sealable resin layer of the adhesive film are the same as those for the heat-sealable resin layer 53.
• the materials constituting the heat-sealable resin layers on both sides of the adhesive film may be the same or different, and are selected appropriately according to the materials constituting the heat-sealable resin layer 53 of the exterior film 50 and the materials constituting the wall portion 80.
• the material constituting the heat-sealable resin layer of the adhesive film on the side bonded to the wall portion 80 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 bonded to the exterior film 50 is preferably the same material as the material constituting 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. If the adhesive film has adhesive properties, when the second sealing portion 100B is formed with the adhesive film disposed between the exterior film 50 and the wall portion 80, the adhesive film is less likely to shift position relative to the lid body 60 and the exterior film 50.
• 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. Examples of 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 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, 460, 560: Lid body 70, 171, 181, 271, 281, 381, 470, 570: Base portion 71: Output portion 72: Cover portion 80, 172, 182, 272, 282, 382, 480, 580: Wall portion 80A: First wall surface 80B: Second wall surface 90, 190, 290, 390, 490, 590: Rib 491: First rib 492: Second rib

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• 2025
  • 2025-03-06 WO PCT/JP2025/008327 patent/WO2025187802A1/ja active Pending
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  • 2025-12-10 JP JP2025244271A patent/JP7816629B1/ja active Active
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