Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/74—Terminals, e.g. extensions of current collectors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/105—Pouches or flexible bags
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/117—Inorganic material
  • H01M50/119—Metals
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
  • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
  • H01M50/128—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only inorganic material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/531—Electrode connections inside a battery casing
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/543—Terminals
  • H01M50/545—Terminals formed by the casing of the 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
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/572—Means for preventing undesired use or discharge
  • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
  • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/572—Means for preventing undesired use or discharge
  • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
  • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/572—Means for preventing undesired use or discharge
  • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
  • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
  • H01M50/591—Covers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• the present invention relates to an electricity storage device, an exterior film, and a method for manufacturing an electricity storage device.
• Patent Document 1 discloses an example of an electricity storage device.
• This electricity storage device comprises an electrode body including a current collector, an exterior body that seals the electrode body, and an electrode terminal that is connected to the current collector.
• the exterior body comprises a laminated film that encases the electrode body, and a lid body that is joined to the laminated film.
• the electrode terminal is inserted into a through hole formed in the lid body. An end of the current collector is joined to the electrode terminal.
• the lid and join the heat-sealable resin layer of the laminated film and the electrode terminal for example, by heat sealing via an adhesive film.
• the time required for joining is long and the joining strength between the laminated film and the electrode terminal is low. For this reason, the sealing performance of the electricity storage device is low.
• the time required for joining can be shortened compared to when joining the laminated film and the electrode terminal by heat sealing.
• the electrode terminal connected to the positive electrode of the electrode body and the electrode terminal connected to the negative electrode are electrically connected via the conductive barrier layer of the laminated film, and it is not possible to output a current. Note that such a problem also occurs when joining the lid containing a conductive material and the laminated film in the above-mentioned electricity storage device.
• the present invention aims to provide an electricity storage device that improves sealing performance and can prevent electrical conduction between the positive and negative electrodes even when the laminated film is joined to a lid or electrode terminal, a laminated film used in this electricity storage device, and a method for manufacturing this electricity storage device.
• the electric storage device comprises an electrode body, a laminated film that encases the electrode body so as to seal the electrode body, and a positive electrode member and a negative electrode member that are connected to the electrode body and comprise a conductive material, the laminated film including a first conductive barrier layer, a second conductive barrier layer, and an insulating layer that is laminated on the first conductive barrier layer and the second conductive barrier layer so that the first conductive barrier layer and the second conductive barrier layer are not electrically connected, the first conductive barrier layer is directly bonded to the positive electrode member or is bonded to the positive electrode member via the insulating layer, and the second conductive barrier layer is directly bonded to the negative electrode member or is bonded to the negative electrode member via the insulating layer.
• the energy storage device is the energy storage device according to the first aspect, in which the insulating layer is laminated between the first conductive barrier layer and the second conductive barrier layer in the lamination direction of the laminated film.
• the electricity storage device is the electricity storage device according to the second aspect, in which the laminated film includes a portion where the first conductive barrier layer, the insulating layer, and the second conductive barrier layer overlap in a planar view.
• the fourth aspect of the present invention is an electric storage device according to any one of the first to third aspects, in which a gap is formed between the first conductive barrier layer and the second conductive barrier layer.
• the fifth aspect of the present invention relates to an electric storage device according to the fourth aspect, in which the first conductive barrier layer and the second conductive barrier layer are stacked on the same surface of the insulating layer.
• the sixth aspect of the present invention is an electric storage device according to any one of the first to fifth aspects, which has a positive electrode junction where the first conductive barrier layer and the positive electrode member are directly joined, and the insulating layer is adjacent to the positive electrode junction.
• the seventh aspect of the present invention is an electric storage device according to any one of the first to sixth aspects, which has a negative electrode junction where the second conductive barrier layer and the negative electrode member are directly joined, and the insulating layer is adjacent to the negative electrode junction.
• the eighth aspect of the present invention is an electric storage device according to any one of the first to seventh aspects, in which the material constituting the insulating layer includes an insulating filler.
• the electricity storage device is an electricity storage device according to any one of the first to eighth aspects, in which the material constituting the insulating layer has gas barrier properties.
• the electricity storage device is an electricity storage device according to any one of the first to ninth aspects, in which at least one of the positive electrode member and the negative electrode member is a lid that seals the electrode body together with the laminated film.
• the electricity storage device is an electricity storage device according to any one of the first to ninth aspects, in which at least one of the positive electrode member and the negative electrode member is an electrode terminal.
• the electricity storage device is an electricity storage device according to any one of the first to eleventh aspects, and further includes an outer bag that encases the laminated film, the positive electrode member, and the negative electrode member.
• the exterior film according to the thirteenth aspect of the present invention is a laminated film that encases an electrode body of an electricity storage device, the electricity storage device being equipped with a positive electrode member and a negative electrode member that are connected to the electrode body and contain a conductive material, the laminated film including a first conductive barrier layer, a second conductive barrier layer, and an insulating layer that is laminated on the first conductive barrier layer and the second conductive barrier layer so that the first conductive barrier layer and the second conductive barrier layer are not electrically connected, the first conductive barrier layer being directly bonded to the positive electrode member or being bonded to the positive electrode member via the insulating layer, and the second conductive barrier layer being directly bonded to the negative electrode member or being bonded to the negative electrode member via the insulating layer.
• the method for manufacturing an electric storage device includes an electrode body, a laminated film that encases the electrode body so as to seal the electrode body, and a positive electrode member and a negative electrode member that are connected to the electrode body and comprise a conductive material
• the laminated film includes a first conductive barrier layer, a second conductive barrier layer, and an insulating layer that is laminated on the first conductive barrier layer and the second conductive barrier layer so that the first conductive barrier layer and the second conductive barrier layer are not electrically connected to each other, the first conductive barrier layer is directly bonded to the positive electrode member or is bonded to the positive electrode member via the insulating layer, and the second conductive barrier layer is directly bonded to the negative electrode member or is bonded to the negative electrode member via the insulating layer.
• the method for manufacturing an electric storage device includes a step of bonding the first conductive barrier layer to the positive electrode member directly or via the insulating layer, and a step of bonding the second conductive barrier layer to the negative
• the electricity storage device, exterior film, and manufacturing method for the electricity storage device according to the present invention improve the sealing performance and prevent electrical conduction between the positive and negative electrodes even when the laminated film is joined to the lid or electrode terminal.
• FIG. 1 is a perspective view of an electricity storage device according to an embodiment.
• FIG. 2 is a diagram showing a state in which an exterior film provided on the electricity storage device in FIG. 1 is unfolded.
• FIG. 2 is a perspective view of a lid provided in the electricity storage device of FIG. 1 .
• FIG. 4 is a cross-sectional view taken along line D4-D4 in FIG. 4 is a flowchart showing an example of a method for manufacturing the electricity storage device of FIG. 1 .
• FIG. 11 is a cross-sectional view of an electricity storage device according to a first modified example.
• FIG. 11 is a cross-sectional view of an electricity accumulation device according to a second modified example.
• FIG. 13 is a cross-sectional view of an electricity accumulation device according to a third modified example.
• FIG. 13 is a cross-sectional view of another example of an electricity accumulation device according to the third modified example.
• FIG. 13 is a cross-sectional view of an electricity accumulation device according to a fourth modified example.
• FIG. 13 is a cross-sectional view of another example of an electricity accumulation device according to the fourth modified example.
• FIG. 13 is a cross-sectional view of an electricity accumulation device according to a fifth modified example.
• FIG. 13 is a cross-sectional view of another example of an electricity accumulation device according to the fifth modified example.
• FIG. 13 is a cross-sectional view of an electricity accumulation device according to a sixth modified example.
• FIG. 13 is a cross-sectional view of an electricity accumulation device according to a seventh modified example.
• FIG. 13 is a cross-sectional view of an electricity storage device according to an eighth modified example.
• Fig. 1 is a plan view showing a schematic diagram of an electric storage device 10 according to an embodiment.
• Fig. 2 is a diagram showing a state in which an exterior film provided in the electric storage device of Fig. 1 is unfolded.
• Fig. 3 is a perspective view of a lid body 60 provided in the electric storage device of Fig. 1.
• Fig. 4 is a cross-sectional view taken along line D4-D4 in Fig. 1.
• 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 power storage device 10 includes an electrode body 20 including a current collector 30, and an exterior body 40.
• the electrode body 20 includes electrodes (positive and negative electrodes) constituting a power storage member such as a lithium ion battery, a capacitor, an all-solid-state battery, a sodium ion battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, a polyvalent cation battery, or a capacitor, as well as a separator.
• a power storage member such as a lithium ion battery, a capacitor, an all-solid-state battery, a sodium ion battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-a
• the shape of the electrode body 20 is an approximately rectangular parallelepiped.
• approximately rectangular parallelepiped includes, in addition to a perfect rectangular parallelepiped, a solid body that can be regarded as a rectangular parallelepiped by modifying the shape of a portion of the outer surface, for example.
• the shape of the electrode body 20 may be, for example, a cylinder or a polygonal prism.
• the exterior body 40 seals the electrode body 20.
• the exterior body 40 includes a laminated film 50 and a lid body 60.
• the laminated film 50 encases the electrode body 20.
• the laminated 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 a laminated film 50 configured in a cylindrical shape so that openings 40A are formed at both ends in the FB direction, and the openings 40A may be closed by the lid body 60.
• the electrode body 20 connected to the lid body 60 may be housed inside a laminated film 50 configured in a cylindrical shape so that openings 40A are formed, and the openings 40A may be closed by the lid body 60.
• the exterior body 40 seals the electrode body 20 by wrapping the laminated film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20.
• the laminated film 50 is wrapped around the electrode body 20 so as to contact the outer surface of the electrode body 20.
• the laminated film 50 is wrapped around the electrode body 20 so as to contact the outer surface of the electrode body 20.
• the lid 60 seals the electrode body 20 together with the laminated film 50.
• the shape of the lid 60 can be selected as desired as long as it can seal the electrode body 20.
• the lid 60 is plate-shaped.
• the lid 60 has a positive electrode lid 60X connected to the positive electrode and a negative electrode lid 60Y connected to the negative electrode.
• the main configurations of the positive electrode lid 60X and the negative electrode lid 60Y are substantially the same. Therefore, in the following, when there is no particular distinction between the positive electrode lid 60X and the negative electrode lid 60Y, they will simply be referred to as lid 60.
• the positive electrode lid 60X corresponds to the positive electrode member
• the negative electrode lid 60Y corresponds to the negative electrode member.
• the lid body 60 is made of a conductive material.
• "made of a conductive material” means that 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, when the entire material constituting the lid body 60 is taken as 100% by mass.
• the material constituting the lid body 60 can contain materials other than the conductive material in addition to the conductive material.
• the lid body 60 made of a conductive material preferably has a corrosion-resistant coating.
• the corrosion-resistant coating refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the surface of the lid body 60 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment such as nickel or chromium, or corrosion prevention treatment by applying a coating agent.
• the corrosion-resistant coating specifically means a coating that improves the acid resistance of the lid body 60 (acid-resistant coating), a coating that improves the alkali resistance of the lid body 60 (alkali-resistant coating), etc.
• the treatment for forming the corrosion-resistant film may be one type, or two or more types may be combined. Also, it is possible to form not only one layer but also multiple layers.
• hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved by a treatment agent to form a metal compound with excellent corrosion resistance. Note that these treatments may be included in the definition of chemical conversion treatment. Also, when the lid body 60 has a corrosion-resistant film, the corrosion-resistant film is included in the lid body 60.
• the conductive material constituting the lid body 60 is, for example, a metal material.
• the metal material constituting the lid body 60 is, for example, aluminum, an aluminum alloy, nickel, copper, or a copper alloy.
• the positive electrode lid body 60X connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the negative electrode lid body 60Y connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material constituting the negative electrode lid body 60Y may be copper plated with nickel.
• the material constituting the lid body 60 may include recycled metal materials.
• the cover 60 has a first surface 61, a second surface 62, and a film joint 63.
• the first surface 61 faces the electrode body 20.
• the first surface 61 is connected to one end 31 of the current collector 30 (see FIG. 4).
• the first surface 61 may have a convex portion protruding toward the electrode body 20.
• the second surface 62 is the surface opposite to the first surface 61.
• the second surface 62 may have a convex portion protruding to the outside of the exterior body 40 in the FB direction.
• the film joint 63 is connected to the first surface 61 and the second surface 62, and is joined to the first conductive barrier layer 51 or the second conductive barrier layer 52 of the laminated film 50 described later.
• the film joint 63 includes a first joint surface 63A, a second joint surface 63B, a third joint surface 63C, and a fourth joint surface 63D.
• the first joint surface 63A constitutes the upper surface of the lid body 60.
• the first joint surface 63A extends in a first direction (LR direction in this embodiment) in a front view of the lid body 60.
• the second joint surface 63B and the third joint surface 63C are connected to the first joint surface 63A and constitute the side surface of the lid body 60.
• the second joint surface 63B and the third joint surface 63C extend in a second direction (UD direction in this embodiment) intersecting the first direction in a front view of the lid body 60.
• the first direction and the second direction are orthogonal in a front view of the lid body 60.
• the first direction and the second direction do not have to be orthogonal in a front view of the lid body 60.
• the fourth joint surface 63D constitutes the lower surface of the lid body 60.
• the fourth joint surface 63D extends in the first direction (the LR direction in this embodiment) when the lid 60 is viewed from the front.
• the lid body 60 When the lid body 60 is plate-shaped, it is preferable that the lid body 60 has a certain thickness in the FB direction so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged on top of each other. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the film joint 63 of the lid body 60 has a certain thickness in the FB direction so that the film joint 63 of the lid body 60 and the laminated film 50 can be suitably joined when forming the second sealing portion 80 described later.
• the minimum value of the thickness of the lid body 60 in the FB direction is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum value of the thickness of the lid body 60 in the FB direction is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm.
• the maximum value of the thickness of the lid body 60 in the FB direction may be 20 mm or more.
• the preferred ranges of the thickness of the lid body 60 in the FB direction are 1.0 mm to 20 mm, 1.0 mm to 15 mm, 1.0 mm to 10 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 10 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, and 4.0 mm to 10 mm.
• the thickness of the lid body 60 may vary depending on the location of the lid body 60. When the thickness of the lid body 60 varies depending on the location, the thickness of the lid body 60 is the thickness of the thickest part.
• the film joint portion 63 further includes boundaries 64, 65, 66, and 67.
• the boundary 64 is the boundary between the first joint surface 63A and the second joint surface 63B.
• the boundary 65 is the boundary between the first joint surface 63A and the third joint surface 63C.
• the boundary 66 is the boundary between the fourth joint surface 63D and the second joint surface 63B.
• the boundary 67 is the boundary between the fourth joint surface 63D and the third joint surface 63C.
• the shapes of the boundaries 64 to 67 may be angular, or may be rounded by applying R processing. In this embodiment, the boundaries 64 to 67 are angular.
• a part of the film joint 63 may not be joined to the first conductive barrier layer 51 or the second conductive barrier layer 52 of the laminated film 50.
• the part of the film joint 63 that is not joined to the first conductive barrier layer 51 or the second conductive barrier layer 52 of the laminated film 50 may be covered, for example, by a coating comprising a resin material.
• a coating comprising a resin material.
• "comprised of a resin material” means that, when the entire material constituting the coating is taken as 100% by mass, the content of the resin 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 coating can contain materials other than the resin material in addition to the resin material.
• resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenol resin, as well as modified versions of these resins.
• the resin material may be a mixture of these resins, a copolymer, or a modified version of a copolymer.
• the resin material is preferably a heat-sealable resin such as polyester or polyolefin, and more preferably polyolefin.
• the covering 90 may be formed by any molding method.
• the resin material contained in the material constituting the coating is preferably an olefin-based random copolymer, more preferably a resin containing a polyolefin skeleton as the main component, even more preferably a polyolefin as the main component, and even more preferably a polypropylene as the main component.
• the polyolefin may be an acid-modified polyolefin.
• the resin material contained in the material constituting the coating preferably contains multiple types of amide-based lubricants. Furthermore, the resin material contained in the material constituting the coating preferably contains multiple types of amide-based lubricants that further contain unsaturated fatty acid amides in addition to saturated fatty acid amides.
• the resin material contained in the material constituting the coating may be a polyolefin resin to which a propylene-based elastomer having a melting point higher than 150°C has been added.
• the main component is the component with the highest mass % of the materials contained in the constituent elements, and is, for example, a material that occupies 35 mass % or more, 50 mass % or more, 90 mass % or more, or 95 mass % or more.
• polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters.
• copolymer polyesters include copolymer polyesters in which ethylene terephthalate is the main repeating unit.
• polyethylene terephthalate is the main repeating unit and is polymerized with ethylene isophthalate
• polyethylene (terephthalate/isophthalate) polyethylene (terephthalate/adipate)
• polyethylene (terephthalate/sodium sulfoisophthalate) polyethylene (terephthalate/sodium isophthalate)
• polyethylene (terephthalate/phenyl-dicarboxylate) polyethylene (terephthalate/decanedicarboxylate).
• polybutylene terephthalate is the preferred resin material from the viewpoint of increasing heat resistance and pressure resistance.
• polyolefins include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene- ⁇ -olefin copolymers; polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); propylene- ⁇ -olefin copolymers; and ethylene-butene-propylene terpolymers.
• polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene
• ethylene- ⁇ -olefin copolymers polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copoly
• the polyolefin resin when it is a copolymer, it may be a block copolymer or a random copolymer.
• polypropylene is preferred as the resin material because of its excellent heat fusion properties and electrolyte resistance, and acid-modified polypropylene that has been craft-modified with an acid such as maleic anhydride is particularly preferred.
• the resin as the resin material may contain a filler as necessary.
• fillers include glass beads, graphite, glass fiber, and carbon fiber.
• the melt mass flow rate of the resin material contained in the material constituting the coating is preferably in the range of 1 g/10 min to 100 g/10 min, and more preferably in the range of 5 g/10 min to 80 g/10 min.
• the melt mass flow rate is measured based on JIS K7210-1:2014.
• the measurement temperature for the melt mass flow rate is 230°C.
• the laminate film 50 is a laminate film including a first conductive barrier layer 51, a second conductive barrier layer 52, and an insulating layer 53.
• the first conductive barrier layer 51, the second conductive barrier layer 52, and the insulating layer 53 are laminated so that the first conductive barrier layer 51 and the second conductive barrier layer 52 are not electrically connected to each other.
• the first conductive barrier layer 51, the insulating layer 53, and the second conductive barrier layer 52 are laminated in this order from the outside of the exterior body 40 toward the electrode body 20.
• the first conductive barrier layer 51 and the second conductive barrier layer 52 are composed of a conductive material.
• the definition of "composed of a conductive material” is the same as that of the cover 60. That is, the material constituting the first conductive barrier layer 51 and the second conductive barrier layer 52 can contain a material other than the conductive material in addition to the conductive material.
• the conductive material constituting the first conductive barrier layer 51 and the second conductive barrier layer 52 is, for example, aluminum, aluminum alloy, titanium, titanium alloy, steel (including stainless steel), copper, copper alloy, nickel, nickel alloy, magnesium, magnesium alloy, niobium, iron, antimony-doped tin oxide, or tin-doped indium oxide.
• the first conductive barrier layer 51 is bonded to the film bonding portion 63 of the positive electrode cover 60X. From the viewpoint of increasing the bonding strength between the first conductive barrier layer 51 and the positive electrode cover 60X, it is preferable that the conductive material contained in the material constituting the first conductive barrier layer 51 is the same conductive material as the conductive material contained in the material constituting the positive electrode cover 60X.
• the second conductive barrier layer 52 is bonded to the film bonding portion 63 of the negative electrode cover 60Y. From the viewpoint of increasing the bonding strength between the second conductive barrier layer 52 and the negative electrode cover 60Y, it is preferable that the conductive material contained in the material constituting the second conductive barrier layer 52 is the same conductive material as the conductive material contained in the material constituting the negative electrode cover 60Y.
• the insulating layer 53 insulates the first conductive barrier layer 51 from the second conductive barrier layer 52 so that the first conductive barrier layer 51 and the second conductive barrier layer 52 are not conductive.
• the material constituting the insulating layer 53 can be selected arbitrarily as long as it can insulate the first conductive barrier layer 51 from the second conductive barrier layer 52.
• the material constituting the insulating layer 53 is, for example, a resin or a ceramic.
• the ceramic is, for example, an oxide, a nitride, a carbonate, or a hydroxide.
• the material constituting the insulating layer 53 may be a combination of a plurality of materials.
• the material constituting the insulating layer 53 contains an insulating filler. From the viewpoint of suppressing the intrusion of moisture into the inside of the exterior body 40, it is preferable that the material constituting the insulating layer 53 has gas barrier properties, and in particular, it is preferable that the material constituting the insulating layer 53 has moisture barrier properties.
• the resin is, for example, a thermoplastic resin such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, phenolic resin, fluororesin, or modified products of these resins. From the viewpoint of moisture barrier properties, the resin is preferably a thermoplastic resin such as a fluororesin or modified products of fluororesin.
• the oxide may be, for example, magnesium oxide, silicon oxide, aluminum oxide, or tin oxide. These oxides have moisture barrier properties.
• the nitride is, for example, aluminum nitride, boron nitride, or silicon nitride. From the viewpoint of moisture barrier properties, the nitride is preferably silicon nitride.
• An example of a carbonate is magnesium carbonate.
• An example of a hydroxide is magnesium hydroxide. Magnesium carbonate and magnesium hydroxide have moisture barrier properties.
• the laminated film 50 preferably includes an overlapping portion 50X where the first conductive barrier layer 51, the insulating layer 53, and the second conductive barrier layer 52 overlap in a plan view.
• the laminated film 50 includes the overlapping portion 50X, even if the material constituting the insulating layer 53 does not have gas barrier properties, the gas barrier properties are enhanced by the first conductive barrier layer 51 and the second conductive barrier layer 52.
• the overlapping portion 50X is formed so as to cover substantially the entire upper and lower surfaces of the electrode body 20.
• the first conductive barrier layer 51 extends in the FB direction further toward the positive electrode cover 60X than the second conductive barrier layer 52 and the insulating layer 53.
• the first conductive barrier layer 51 in the portion of the laminated film 50 including the third edge 50C (see FIG. 2) is joined to the film joint 63 of the positive electrode cover 60X by, for example, welding.
• the second conductive barrier layer 52 extends in the FB direction further toward the negative electrode cover 60Y than the first conductive barrier layer 51 and the insulating layer 53.
• the second conductive barrier layer 52 in the portion including the fourth edge 50D (see FIG. 2) of the laminated film 50 is joined to the film joint 63 of the negative electrode cover 60Y, for example, by welding.
• another insulating layer is laminated on the surface of the second conductive barrier layer 52 opposite the surface on which the insulating layer 53 is laminated.
• the end 53X of the insulating layer 53 on the positive electrode cover 60X side is located closer to the positive electrode cover 60X than the end 52X of the second conductive barrier layer 52 on the positive electrode cover 60X side.
• the end 53Y on the negative electrode cover 60Y side of the insulating layer 53 is located closer to the negative electrode cover 60Y than the end 51Y on the negative electrode cover 60Y side of the first conductive barrier layer 51.
• the thickness of the first conductive barrier layer 51 and the second conductive barrier layer 52 can be selected arbitrarily.
• the thickness of the first conductive barrier layer 51 and the second conductive barrier layer 52 is preferably about 200 ⁇ m or less, more preferably about 150 ⁇ m or less, even more preferably about 120 ⁇ m or less, and particularly preferably about 80 ⁇ m or less.
• the thickness of the first conductive barrier layer 51 and the second conductive barrier layer 52 is preferably about 4 ⁇ m or more, more preferably about 10 ⁇ m or more, and more preferably about 15 ⁇ m or more.
• preferred ranges of the thickness of the first conductive barrier layer 51 and the second conductive barrier layer 52 include about 4 to 200 ⁇ m, about 4 to 150 ⁇ m, about 4 to 120 ⁇ m, about 4 to 80 ⁇ m, about 10 to 200 ⁇ m, about 10 to 150 ⁇ m, about 10 to 120 ⁇ m, about 10 to 80 ⁇ m, about 15 to 200 ⁇ m, about 15 to 150 ⁇ m, about 15 to 120 ⁇ m, and about 15 to 80 ⁇ m.
• the thickness of the first conductive barrier layer 51 and the thickness of the second conductive barrier layer 52 may be different or the same.
• the thickness of the insulating layer 53 can be selected arbitrarily.
• the thickness of the insulating layer 53 is preferably about 300 ⁇ m or less, more preferably about 200 ⁇ m or less, even more preferably about 150 ⁇ m or less, and particularly preferably about 120 ⁇ m or less.
• the thickness of the insulating layer 53 is preferably about 5 ⁇ m or more, even more preferably about 15 ⁇ m or more, and more preferably about 30 ⁇ m or more.
• the preferred ranges for the thickness of the insulating layer 53 include about 5 to 300 ⁇ m, about 5 to 200 ⁇ m, about 5 to 150 ⁇ m, about 5 to 120 ⁇ m, about 15 to 300 ⁇ m, about 15 to 200 ⁇ m, about 15 to 150 ⁇ m, about 15 to 120 ⁇ m, about 30 to 300 ⁇ m, about 30 to 200 ⁇ m, about 30 to 150 ⁇ m, and about 30 to 120 ⁇ m.
• the first sealing portion 70 is formed by bonding the mutually facing surfaces of the laminate film 50 in a state where the laminate film 50 is wrapped around the electrode body 20.
• a heat-sealable resin layer is laminated on the surface of the second conductive barrier layer 52 opposite to the surface on which the insulating layer 53 is laminated.
• the first sealing portion 70 may be formed by bonding the insulating layers 53 of the laminate film 50 on the mutually facing surfaces.
• the first sealing portion 70 may be formed by bonding the mutually facing surfaces of the laminate film 50, such as the first conductive barrier layer 51 or the second conductive barrier layer 52, by, for example, welding.
• the heat-sealable resin layer is bonded to the second conductive barrier layer 52, for example.
• the heat-sealable resin layer may be bonded to the second conductive barrier layer 52 via an adhesive layer.
• the heat-sealable resin layer included in the laminated film 50 is a layer that imparts heat-sealing sealability to the laminated film 50.
• the heat-sealable resin layer include resin films made of polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the thickness of the heat-sealable resin layer is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m, in terms of sealability and strength.
• the first sealing portion 70 is formed by heat sealing a portion including the first edge 50A and a portion including the second edge 50B of the laminated film 50 shown in FIG. 2.
• the first sealing portion 70 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position at which the first sealing portion 70 is formed in the exterior body 40 can be selected arbitrarily.
• the root 70X of the first sealing portion 70 is preferably located on the edge 43 at the boundary between the first surface 41 and the second surface 42 of the exterior body 40.
• the first surface 41 has a larger area than the second surface 42.
• the root 70X of the first sealing portion 70 may be located on any surface of the exterior body 40.
• the first sealing portion 70 protrudes outward from the electrode body 20 in a plan view.
• the first sealing portion 70 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 80 is formed by joining the first conductive barrier layer 51 and the second conductive barrier layer 52 of the laminated film 50 to the film joint portion 63 of the lid body 60.
• Manufacturing method of electricity storage device> 5 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, and a fourth step.
• the first step to the fourth step are performed, for example, by a manufacturing device for the power storage device 10. At least a part of the first step to the fourth step may be performed by an operator.
• the first step to the fourth step are names of the steps in the method for manufacturing the power storage device 10 that are defined for convenience, and do not necessarily refer to the order of the steps.
• the order of the first step to the fourth step can be changed as desired as long as there is no technical contradiction.
• the manufacturing equipment places the positive electrode cover 60X on one side of the electrode body 20 in the FB direction, and the negative electrode cover 60Y on the other side.
• the manufacturing equipment joins the current collector 30 to the positive electrode cover 60X and the negative electrode cover 60Y.
• the second step of step S12 is performed after the first step.
• the manufacturing device winds the laminated film 50 around the electrode body 20 and the lid body 60 while tension is applied to the laminated film 50, while restricting the movement of the electrode body 20 and the lid body 60 by the restricting means.
• the restricting means is, for example, a groove into which the electrode body 20 and the lid body 60 are fitted.
• the restricting means may be a device that applies an external force to the electrode body 20 and the lid body 60 so that the electrode body 20 and the lid body 60 do not move.
• the restricting means may be a device that applies a force to the electrode body 20 and the lid body 60 in the opposite direction to the direction in which the laminated film 50 is pulled.
• the restricting means may include a roller that runs on the laminated film 50 while the laminated film 50 is being pulled in order to remove wrinkles in the laminated film 50.
• the electrode body 20 may be housed inside the laminated film 50 configured in a cylindrical shape so that openings are formed at both ends in the FB direction, and the current collector 30 and the lid 60 may be joined, and then the opening may be closed by the lid 60.
• the electrode body 20 connected to the lid 60 may be housed inside the laminated film 50 configured in a cylindrical shape so that openings are formed at both ends in the FB direction, and the opening may be closed by the lid 60.
• the third step of step S13 is performed after the second step.
• the manufacturing equipment forms the second sealing portion 80 by welding the first conductive barrier layer 51 and the second conductive barrier layer 52 of the laminated film 50 to the film joint portion 63 of the lid body 60.
• the fourth step of step S14 is performed before or after the third step.
• the manufacturing device forms the first sealing portion 70 by heat-sealing the heat-sealable resin layer of the portion including the first edge 50A of the laminated film 50 and the heat-sealable resin layer of the portion including the second edge 50B while restricting the movement of the electrode body 20 and the lid body 60, with tension acting on the laminated film 50.
• the first sealing portion 70 may be formed by bonding the insulating layers 53 of the laminated film 50 on the mutually facing surfaces.
• the first sealing portion 70 is formed by bonding the first conductive barrier layer 51 or the second conductive barrier layer 52 of the laminated film 50 on the mutually facing surfaces by, for example, welding.
• the first conductive barrier layer 51 and the positive electrode cover 60X are directly bonded to each other.
• the second conductive barrier layer 52 and the negative electrode cover 60Y are directly bonded to each other. Therefore, the bonding strength of the second sealing portion 80 is high.
• the insulating layer 53 is laminated on the first conductive barrier layer 51 and the second conductive barrier layer 52 so that the first conductive barrier layer 51 and the second conductive barrier layer 52 are not electrically connected to each other. Therefore, in the power storage device 10, the sealing property is improved and electrical conduction between the positive electrode cover 60X and the negative electrode cover 60Y is suppressed.
• the above-mentioned embodiments are examples of possible forms of the electricity storage device, exterior film, and manufacturing method of the electricity storage device according to the present invention, and are not intended to limit the forms.
• the electricity storage device, exterior film, and manufacturing method of the electricity storage device according to the present invention may take forms different from those exemplified in the embodiments.
• One example is a form in which a part of the configuration of the embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to the embodiment.
• Some examples of modified embodiments are shown. Note that the following modified examples can be combined with each other as long as there is no technical contradiction.
• Fig. 6 is a cross-sectional view of the electricity storage device 10 of a first modified example.
• one of the first conductive barrier layer 51 and the second conductive barrier layer 52 of the laminated film 50 is laminated in a portion of the insulating layer 53 where the other is not laminated.
• the insulating layer 53 includes a portion where neither the first conductive barrier layer 51 nor the second conductive barrier layer 52 is laminated.
• the first conductive barrier layer 51 and the second conductive barrier layer 52 may be laminated on the same surface of the insulating layer 53.
• FIG. 7 is a cross-sectional view of the power storage device 10 of the second modification.
• the first conductive barrier layer 51 and the second conductive barrier layer 52 are laminated on the surface of the insulating layer 53 opposite to the surface facing the electrode body 20.
• the first conductive barrier layer 51 and the second conductive barrier layer 52 are preferably laminated on the insulating layer 53 so as to form a gap in the FB direction so as not to be conductive to each other.
• an arbitrary layer containing a material having gas barrier properties may be laminated between the first conductive barrier layer 51 and the second conductive barrier layer 52 of the insulating layer 53.
• the first conductive barrier layer 51 and the second conductive barrier layer 52 may be laminated on the surface of the insulating layer 53 facing the electrode body 20.
• the laminated film 50 may have an insulating layer 54 laminated on the surface of the second conductive barrier layer 52 opposite to the surface on which the insulating layer 53 is laminated.
• FIG. 8A is a cross-sectional view of the electricity storage device 10 of the third modified example.
• the insulating layer 53 may be laminated up to a portion including the end 51X of the first conductive barrier layer 51 on the positive electrode cover body 60X side. When the first conductive barrier layer 51 and the film joint portion 63 of the positive electrode cover body 60X are welded together, a part of the insulating layer 53 melts.
• the insulating layer 53 is adjacent to the positive electrode joint portion 60XA, which is the portion where the first conductive barrier layer 51 and the positive electrode cover body 60X are joined together.
• the insulating layer 53 melts by heat sealing, the first conductive barrier layer 51 and the positive electrode cover body 60X are adjacent to each other, and the first conductive barrier layer 51 and the positive electrode cover body 60X may be joined together by subsequent welding. Even in this case, the insulating layer 53 is adjacent to the positive electrode joint portion 60XA.
• the insulating layer 54 may be laminated up to a portion including the end 52Y of the second conductive barrier layer 52 on the negative electrode cover 60Y side.
• the second conductive barrier layer 52 and the film joint 63 of the negative electrode cover 60Y are welded together, a part of the insulating layer 54 melts. Therefore, the insulating layer 54 is adjacent to the negative electrode joint 60YA, which is the part where the second conductive barrier layer 52 and the negative electrode cover 60Y are joined.
• a part of the insulating layer 54 melts by heat sealing, and the second conductive barrier layer 52 and the negative electrode cover 60Y are adjacent to each other, and the second conductive barrier layer 52 and the negative electrode cover 60Y are joined by subsequent welding. Even in this case, the insulating layer 54 is adjacent to the negative electrode joint 60YA.
• FIG. 8B is a cross-sectional view of another example of the electric storage device 10 of the third modified example.
• the first conductive barrier layer 51 and the positive electrode cover 60X may be joined via the insulating layer 53.
• the second conductive barrier layer 52 and the negative electrode cover 60Y may be joined via the insulating layer 54.
• the bonding strength of the second sealing portion 80 is higher than that of the electric storage device in which the second sealing portion is formed by conventional heat sealing.
• the laminated film 50 does not have electrical conductivity between the positive electrode cover 60X and the negative electrode cover 60Y even if it does not have the second conductive barrier layer 52.
• the laminated film 50 is provided with a second conductive barrier layer 52.
• the laminated film 50 may have an insulating layer 54 laminated on the surface of the second conductive barrier layer 52 opposite to the surface on which the insulating layer 53 is laminated.
• FIG. 9A is a cross-sectional view of the electricity storage device 10 of the fourth modification.
• the insulating layer 53 may be laminated up to a portion including the end 51X of the first conductive barrier layer 51 on the positive electrode cover 60X side. When the first conductive barrier layer 51 and the film joint 63 of the positive electrode cover 60X are welded together, a part of the insulating layer 53 melts.
• the insulating layer 53 is adjacent to the positive electrode joint 60XA, which is the part where the first conductive barrier layer 51 and the positive electrode cover 60X are joined together.
• the insulating layer 53 melts by heat sealing, the first conductive barrier layer 51 and the positive electrode cover 60X are adjacent to each other, and the first conductive barrier layer 51 and the positive electrode cover 60X may be joined together by subsequent welding. Even in this case, the insulating layer 53 is adjacent to the positive electrode joint portion 60XA.
• the insulating layer 54 may be laminated up to a portion including the end 52Y of the second conductive barrier layer 52 on the negative electrode cover 60Y side.
• the second conductive barrier layer 52 and the film joint 63 of the negative electrode cover 60Y are welded together, a part of the insulating layer 54 melts. Therefore, the insulating layer 54 is adjacent to the negative electrode joint 60YA, which is the part where the second conductive barrier layer 52 and the negative electrode cover 60Y are joined.
• a part of the insulating layer 54 melts by heat sealing, and the second conductive barrier layer 52 and the negative electrode cover 60Y are adjacent to each other, and the second conductive barrier layer 52 and the negative electrode cover 60Y are joined by subsequent welding. Even in this case, the insulating layer 54 is adjacent to the negative electrode joint 60YA.
• FIG. 9B is a cross-sectional view of another example of the electric storage device 10 of the fourth modified example.
• the first conductive barrier layer 51 and the positive electrode cover 60X may be joined via the insulating layer 53.
• the second conductive barrier layer 52 and the negative electrode cover 60Y may be joined via the insulating layer 54.
• the bonding strength of the second sealing portion 80 is higher than that of the electric storage device in which the second sealing portion is formed by conventional heat sealing.
• the laminated film 50 does not have electrical conductivity between the positive electrode cover 60X and the negative electrode cover 60Y even if it does not have the second conductive barrier layer 52.
• the laminated film 50 is provided with a second conductive barrier layer 52.
• the insulating layer 53 may be laminated up to a portion including the end 51X of the first conductive barrier layer 51 on the positive electrode cover 60X side and a portion including the end 52Y of the second conductive barrier layer 52 on the negative electrode cover 60Y side.
• FIG. 10A is a cross-sectional view of the power storage device 10 of the fifth modification.
• a part of the insulating layer 53 melts by heat sealing, and the first conductive barrier layer 51 and the positive electrode cover 60X are adjacent to each other, and the first conductive barrier layer 51 and the positive electrode cover 60X may be joined together by subsequent welding. Even in this case, the insulating layer 53 is adjacent to the positive electrode joint 60XA.
• the insulating layer 53 melts. Therefore, the insulating layer 53 is adjacent to the negative electrode joint 60YA, which is the part where the second conductive barrier layer 52 and the negative electrode cover 60Y are joined.
• a part of the insulating layer 53 melts by heat sealing, and the second conductive barrier layer 52 and the negative electrode cover 60Y are adjacent to each other, and the second conductive barrier layer 52 and the negative electrode cover 60Y are then joined by welding. Even in this case, the insulating layer 53 is adjacent to the negative electrode joint 60YA.
• FIG. 10B is a cross-sectional view of another example of the electric storage device 10 of the fifth modified example.
• the first conductive barrier layer 51 and the positive electrode cover 60X may be joined via the insulating layer 53.
• the second conductive barrier layer 52 and the negative electrode cover 60Y may be joined via the insulating layer 54.
• the bonding strength of the second sealing portion 80 is higher than that of the electric storage device in which the second sealing portion is formed by conventional heat sealing.
• the laminated film 50 does not have electrical conductivity between the positive electrode cover 60X and the negative electrode cover 60Y even if it does not have the second conductive barrier layer 52.
• the laminated film 50 is provided with a second conductive barrier layer 52.
• Fig. 11 is a cross-sectional view showing an example of the layer structure of the laminated film 50 included in the electricity storage device of the sixth modified example.
• the laminated film 50 may have an insulating layer 55 and an insulating layer 56.
• the insulating layer 55 is laminated on the surface of the first conductive barrier layer 51 opposite to the surface on which the insulating layer 53 is laminated.
• the insulating layer 56 is laminated on the surface of the second conductive barrier layer 52 opposite to the surface on which the insulating layer 53 is laminated.
• the end 51X of the first conductive barrier layer 51 on the positive electrode cover 60X side is preferably closer to the positive electrode cover 60X than the end 55X of the insulating layer 55 on the positive electrode cover 60X side. Since the end 51X of the first conductive barrier layer 51 is exposed, the first conductive barrier layer 51 and the positive electrode cover 60X can be easily joined.
• the end 52Y of the second conductive barrier layer 52 on the negative electrode cover 60Y side is preferably closer to the negative electrode cover 60Y than the end 56Y of the insulating layer 56 on the negative electrode cover 60Y side. Since the end 52Y of the second conductive barrier layer 52 is exposed, the second conductive barrier layer 52 and the negative electrode cover 60Y can be easily joined.
• the power storage device 10 may further include an outer bag 100 that insulates the laminated film 50, the positive electrode lid 60X, and the negative electrode lid 60Y from the outside.
• FIG. 12 is a cross-sectional view of the power storage device 10 of the seventh modification.
• the outer bag 100 encases at least the laminated film 50, the positive electrode lid 60X, and the negative electrode lid 60Y.
• the material constituting the outer bag 100 can be selected arbitrarily as long as it is a material having insulating properties.
• the material exemplified as the material constituting the insulating layer 53 can be used as the material constituting the outer bag 100.
• a hole 100X through which wiring or the like for connecting an external device to the lid 60 can pass is formed in the portion of the outer bag 100 facing the second surface 62 of the lid 60.
• FIG. 13 is a cross-sectional view of the power storage device 10 of the eighth modification.
• the positive electrode member and the negative electrode member are electrode terminals 130A and 130B.
• the first conductive barrier layer 51 is joined to the electrode terminal 130A connected to the positive electrode.
• the second conductive barrier layer 52 is connected to the electrode terminal 130B connected to the negative electrode.
• the laminated film 50 may be formed with an accommodation portion (recess) that accommodates the electrode body 20 by, for example, cold forming.
• the eighth modification can be similarly applied to the first to seventh modifications.
• the first conductive barrier layer 51 in the portion including the third edge 50C (see FIG. 2) of the laminated film 50 may be joined to the film joint portion 63 of the negative electrode cover body 60Y, for example, by welding.
• the second conductive barrier layer 52 in the portion including the fourth edge 50D (see FIG. 2) of the laminated film 50 may be joined to the film joint portion 63 of the positive electrode cover body 60X, for example, by welding.
• the ninth modification can be similarly applied to the first to eighth modifications.
• the laminated film 50 of the power storage device 10 may protrude outward from at least one of the positive electrode cover 60X and the negative electrode cover 60Y in the FB direction.
• the electrode body 20 is sealed by closing the portion of the laminated film 50 protruding outward from the cover 60.
• the portion of the laminated film 50 protruding outward from the cover 60 may be folded like a Goebel-top pouch or a brick-type pouch.
• a convex portion for connecting to an external device is preferably formed on the second surface 62 of the cover 60.
• the length of the convex portion in the FB direction is preferably a length that is exposed from the portion of the laminated film 50 protruding outward from the cover 60.
• 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.
• Electrode body 40 Exterior body 50: Laminated film 51: First conductive barrier layer 52: Second conductive barrier layer 53: Insulating layer 60: Lid 60X: Positive electrode lid (positive electrode member) 60Y: Negative electrode cover (negative electrode member) 60XA: Positive electrode joint 60YA: Negative electrode joint 130A: Electrode terminal (positive electrode member) 130B: Electrode terminal (negative electrode member)

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