Classifications

• • 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
  • 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
  • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
  • H01G2/10—Housing; Encapsulation
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/004—Details
  • H01G9/08—Housing; Encapsulation
• • 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
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/058—Construction or manufacture
  • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• • 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
• • 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
  • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/184—Sealing members characterised by their shape or structure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/186—Sealing members characterised by the disposition of the sealing members
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/191—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
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/193—Organic material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/195—Composite material consisting of a mixture of organic and inorganic materials
• • 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
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
  • H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
  • H01M10/0562—Solid materials
• • 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 and a method for manufacturing the same.
• Patent Document 1 discloses an all-solid-state battery as an example of an electricity storage device.
• This all-solid-state battery includes an electrode body, an electrode terminal, and an exterior body that seals the electrode body.
• the exterior body includes an exterior film that is wrapped around the electrode body to have an opening, and a lid body that is placed on the opening.
• One end of the electrode terminal is electrically connected to the electrode body.
• the other end of the electrode terminal is exposed to the outside of the lid body.
• the electrode terminal penetrates the lid body.
• the side of the lid body and the exterior film are bonded via a sealant layer formed on them, or via an adhesive layer.
• Patent Document 1 In an electricity storage device such as that described in Patent Document 1, from the viewpoint of ensuring a reliable seal between the lid and the exterior film, it is preferable that the side dimensions of the lid and the dimensions of the exterior film facing the side of the lid match. However, in reality, there may be a difference between the two dimensions, and such a difference may lead to poor sealing between the lid and the exterior film. Patent Document 1 does not take this into consideration.
• the present invention aims to provide an electricity storage device with improved sealing between the lid and the exterior film.
• the energy storage device comprises an electrode body, an exterior film, a lid body, a sealing portion, and a sealing reinforcement portion.
• the exterior film envelops the electrode body to form an opening, and has a first sealing area.
• the lid body is disposed in the opening, and has a second sealing area facing the first sealing area.
• the sealing portion is formed between the first sealing area and the second sealing area, and at least partially seals between the first sealing area and the second sealing area.
• the sealing reinforcement portion reinforces the sealing provided by the sealing portion.
• the electric storage device is the electric storage device according to the first aspect, in which the material forming the seal reinforcement portion includes at least one of resin, metal, ceramic, and rubber, a mixture of at least two of these, and a composite of at least two of these.
• the electric storage device is the electric storage device according to the first or second aspect, in which the seal reinforcement portion is formed between the first seal area and the second seal area, at least in a portion where the seal portion is not formed.
• the electric storage device is an electric storage device according to any one of the first to third aspects, in which the lid has a polygonal shape with an apex when viewed from the front, and the seal reinforcement portion is formed so as to at least partially cover at least one apex of the polygonal shape of the lid from the outside.
• the fifth aspect of the present invention is an electric storage device according to any one of the first to fourth aspects, in which the seal reinforcement portion covers at least a portion of the first seal area and at least a portion of the second seal area from the outside of the exterior film and the lid body.
• the sixth aspect of the present invention is an electric storage device according to any one of the first to fifth aspects, in which the electrode body has a three-dimensional shape including multiple corners, and the seal reinforcement portion covers at least one of the multiple corners from the outside of the exterior film.
• the seventh aspect of the present invention is an electric storage device according to any one of the first to sixth aspects, in which the electrode body has a three-dimensional shape including two faces that intersect with each other and a ridge portion formed by the two faces, and the seal reinforcement portion covers the ridge portion from the outside of the exterior film.
• the manufacturing method of the electricity storage device includes preparing an electrode body, wrapping the electrode body with the exterior film having a first sealing area so as to form an opening, arranging a lid body having a second sealing area at the opening so that the second sealing area faces the first sealing area, forming a seal portion between the first sealing area of the exterior film and the second sealing area of the lid body, which at least partially seals the area between the first sealing area and the second sealing area, and forming a seal reinforcement portion between the first sealing area and the second sealing area, at least in a portion where the seal portion is not formed, which reinforces the seal portion.
• the manufacturing method of the electricity storage device includes preparing an electrode body, wrapping the electrode body with the exterior film having a first sealing area so as to form an opening, arranging a lid body having a second sealing area at the opening so that the second sealing area faces the first sealing area, forming a seal portion between the first sealing area of the exterior film and the second sealing area of the lid body, which at least partially seals between the first sealing area and the second sealing area, impregnating at least a part of the first sealing area and at least a part of the second sealing area with a material in a fluid state, and solidifying the material in a fluid state to form a seal reinforcement portion that reinforces the seal portion.
• the manufacturing method of the electricity storage device includes preparing an electrode body, wrapping the electrode body in an exterior film having a first sealing area so as to form an opening, arranging a lid body having a second sealing area at the opening so that the second sealing area faces the first sealing area, forming a seal portion between the first sealing area of the exterior film and the second sealing area of the lid body that at least partially seals between the first sealing area and the second sealing area, preparing a reinforcing member that is configured to be attachable to the lid body and covers at least a part of the first sealing area and at least a part of the second sealing area from the outside of the lid body, and attaching the reinforcing member to the lid body to form a seal reinforcing portion that reinforces the seal portion.
• the present invention provides an electricity storage device with improved sealing between the lid and the exterior film.
• FIG. 1 is a perspective view of an electricity storage device according to a first embodiment.
• FIG. 2 is a perspective view of the electrode body of FIG. 2 is a cross-sectional view showing a layer structure of an exterior film included in the electricity storage device of FIG. 1 .
• FIG. 4 is a perspective view showing a schematic configuration of an end portion of an exterior film.
• FIG. 2 is a perspective view showing a schematic configuration of a lid body.
• FIG. 4 is a front view showing a schematic configuration around the lid body. 4 is a flowchart showing a method for manufacturing the electricity storage device according to the first embodiment.
• FIG. FIG. 11 is a perspective view showing a schematic configuration of the periphery of a lid of an electricity storage device according to a second embodiment.
• FIG. 13A to 13C are diagrams illustrating a method for forming a seal reinforcement portion according to a second embodiment.
• FIG. 13 is a perspective view showing a schematic configuration of the periphery of a lid of an electricity storage device according to a third embodiment.
• FIG. 13 is a perspective view showing a schematic configuration of an electricity storage device according to a fourth embodiment.
• FIG. 13 is a perspective view showing a schematic configuration of an electricity accumulation device according to a modified example.
• FIG. 4 is a diagram showing an example of a usage state of the power storage device.
• Fig. 1 is a perspective view that typically illustrates an electricity storage device 10 of a first embodiment.
• the electricity storage device 10 includes an electrode body 20, a pair of electrode terminals 30, and an exterior body 40.
• the direction of the arrow UD indicates the thickness direction of the electricity storage device 10
• the direction of the arrow LR indicates the width direction of the electricity storage device 10
• the direction of the arrow FB indicates the depth direction of the electricity storage device 10.
• the directions indicated by the arrows UD, LR, and FB are the same in the subsequent figures.
• FIG. 2 is a side view showing a schematic configuration of the electrode body 20.
• the electrode body 20 includes, for example, a lithium ion battery, a capacitor, or an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, a polyvalent cation battery, or an electrode (positive electrode and negative electrode) constituting a storage member such as a capacitor, and a separator, etc.
• a lithium ion battery a capacitor, or an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery
• the electrode body 20 has an approximately rectangular parallelepiped shape.
• approximately rectangular parallelepiped includes, for example, a solid that can be regarded as a rectangular parallelepiped by modifying the shape of a part of the outer surface.
• the electrode body 20 may have a three-dimensional shape including multiple corners, such as an approximately polygonal prism, or may have an approximately cylindrical shape.
• the electrode body 20 has a front surface 21, a back surface 22, a top surface 23, a bottom surface 24, a first side surface 25, and a second side surface 26.
• the front surface 21, the back surface 22, the first side surface 25, and the second side surface 26 are imaginary surfaces when the electrode body 20 is viewed as an approximately rectangular parallelepiped.
• the front surface 21 faces one of the lid bodies 60.
• the back surface 22 faces the other lid body 60.
• the top surface 23 constitutes one of the first surfaces 41 of the exterior body 40 described later.
• the bottom surface 24 constitutes the other of the pair of first surfaces 41 of the exterior body 40 described later.
• the first side surface 25 constitutes one of the pair of second surfaces 42 of the exterior body 40 described later.
• the second side surface 26 constitutes the other of the pair of second surfaces 42 of the exterior body 40 described later.
• the electrode body 20 has ridge portions 20A, 20B, 20C, and 20D.
• Ridge portion 20A is formed at the boundary between the upper surface 23 and the first side surface 25.
• Ridge portion 20B is formed at the boundary between the upper surface 23 and the second side surface 26.
• Ridge portion 20C is formed at the boundary between the first side surface 25 and the lower surface 24.
• Ridge portion 20D is formed at the boundary between the second side surface 26 and the lower surface 24.
• a ridge portion refers to the boundary between two surfaces that intersect with each other.
• the ends of each of ridge portions 20A to 20D form corner portions 230 that correspond to the vertices of a substantially rectangular parallelepiped.
• the exterior body 40 seals the electrode body 20.
• the exterior body 40 includes an exterior film 50 and a pair of lid bodies 60.
• the exterior film 50 wraps the electrode body 20 so as to form a pair of openings 40A.
• the exterior film 50 is wrapped around the electrode body 20 so as to form a pair of openings 40A.
• the exterior film 50 has a protruding portion 50X that protrudes outward from the portion wrapping the electrode body 20 in a state in which the exterior film 50 wraps the electrode body 20.
• the pair of lid bodies 60 are respectively disposed on the sides of the electrode body 20 so as to close the pair of openings 40A.
• a storage section for example, there is a method of forming a storage section (recess) in the exterior film 50 through cold forming to accommodate the electrode body 20.
• the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20.
• the exterior film 50 is wrapped in contact with the outer surface of the electrode body 20.
• the exterior film 50 is wrapped around the outer surface of the electrode body 20 so that it is in contact with the outer surface of the electrode body 20.
• FIG. 3 is a cross-sectional view showing the layer structure of the exterior film 50.
• the exterior film 50 is a laminate (laminate film) having, for example, a base layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order.
• the exterior film 50 does not need to include all of these layers, and for example, the barrier layer 52 may not be included.
• the exterior film 50 may be made of a material that is flexible and easily bendable, and may be made of, for example, a resin film.
• the exterior film 50 is preferably heat-sealable.
• the substrate layer 51 included in the exterior film 50 is a layer for imparting heat resistance to the exterior film 50 and suppressing the occurrence of pinholes that may occur during processing or distribution.
• the substrate layer 51 is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer.
• the barrier layer 52 can be protected during processing of the exterior film 50 and breakage of the exterior film 50 can be suppressed.
• the stretched polyester resin layer is preferably a biaxially stretched polyester resin layer
• the stretched polyamide resin layer is preferably a biaxially stretched polyamide resin layer.
• the stretched polyester resin layer is more preferably a biaxially stretched polyethylene terephthalate (PET) film
• the stretched polyamide resin layer is more preferably a biaxially stretched nylon (ONy) film.
• the substrate layer 51 may be composed of both a stretched polyester resin layer and a stretched polyamide resin layer. From the standpoint of film strength, the thickness of the base layer 51 is preferably, for example, 5 to 300 ⁇ m, and more preferably 20 to 150 ⁇ m.
• the barrier layer 52 is a layer that at least prevents the intrusion of moisture.
• 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 film, and resin layer having barrier properties.
• the vapor deposition film examples include metal vapor deposition film, inorganic oxide vapor deposition film, and carbon-containing inorganic oxide vapor deposition film
• the resin layer examples include fluorine-containing resins such as polyvinylidene chloride, polymers mainly composed of chlorotrifluoroethylene (CTFE), polymers mainly composed of tetrafluoroethylene (TFE), polymers having fluoroalkyl groups, and polymers mainly composed of fluoroalkyl units, and ethylene-vinyl alcohol copolymers.
• CTFE chlorotrifluoroethylene
• TFE tetrafluoroethylene
• the barrier layer 52 examples include resin films having at least one layer of these vapor deposition films and resin layers. The barrier layer 52 may be provided in multiple layers.
• the barrier layer 52 includes a layer composed of a metal material.
• metal materials constituting the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates.
• metal foil it is preferable to use at least one of aluminum alloy foil and stainless steel foil.
• the layer made of the above-mentioned metal material may contain recycled metal material.
• recycled metal material include recycled aluminum alloy, stainless steel, titanium steel, or steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloy can be obtained by the manufacturing method described in WO 2022/092231.
• the barrier layer 52 may be made of only recycled material, or may be made of a mixture of recycled and virgin materials. Note that recycled metal material refers to metal material that has been made reusable by collecting, isolating, and refining various products used in the city and waste from manufacturing processes. Also, virgin metal material refers to new metal material that has been refined from natural metal resources (raw materials) and is not recycled material.
• the aluminum alloy foil is preferably a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of further improving the formability or conformability, it is preferable that the aluminum alloy foil is an iron-containing aluminum alloy foil.
• the iron-containing aluminum alloy foil (100% by mass) 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 having better formability can be obtained.
• an exterior film 50 having better flexibility can be obtained.
• the soft aluminum alloy foil 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, etc. may be added as necessary.
• the softening can be performed by annealing or the like. From the viewpoint of improving the mechanical strength of the exterior film 50, it is more preferable that the aluminum alloy foil is a hard aluminum alloy foil composed of, for example, a work-hardened aluminum alloy.
• hard aluminum alloy foils examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-H18, JIS H4160:1994 A8079H-H18, JIS H4000:2014 A8021P-H14, or JIS H4000:2014 A8079P-H14.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. Furthermore, from the viewpoint of providing an exterior film 50 with excellent formability, it is preferable that the stainless steel foil is made of austenitic stainless steel.
• austenitic stainless steels that make up the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.
• the thickness of the barrier layer 52 should be such that it at least functions as a barrier layer to prevent the penetration of moisture, and may be, for example, about 5 to 200 ⁇ m.
• the thickness of the barrier layer 52 is preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, and particularly preferably about 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably about 9.0 ⁇ m or more, more preferably about 20 ⁇ m or more, and more preferably about 25 ⁇ m or more.
• Preferred ranges of the thickness of the barrier layer 52 include about 9.0 to 85 ⁇ m, about 9.0 to 50 ⁇ m, about 9.0 to 40 ⁇ m, about 9.0 to 35 ⁇ m, about 20 to 85 ⁇ m, about 20 to 50 ⁇ m, about 20 to 40 ⁇ m, about 20 to 35 ⁇ m, about 25 to 85 ⁇ m, about 25 to 50 ⁇ m, about 25 to 40 ⁇ m, and about 25 to 35 ⁇ m.
• the barrier layer 52 is made of an aluminum alloy foil, the above-mentioned ranges are particularly preferred.
• the thickness of the barrier layer 52 is preferably about 35 ⁇ m or more, more preferably about 45 ⁇ m or more, even more preferably about 50 ⁇ m or more, and even more preferably about 55 ⁇ m or more, and is preferably about 200 ⁇ m or less, more preferably about 85 ⁇ m or less, even more preferably about 75 ⁇ m or less, and even more preferably about 70 ⁇ m or less.
• the preferable ranges are about 35 to 200 ⁇ m, about 35 to 85 ⁇ m, about 35 to 75 ⁇ m, about 35 to 70 ⁇ m, about 45 to 200 ⁇ m, about 45 to 85 ⁇ m, about 45 to 75 ⁇ m, about 45 to 70 ⁇ m, about 50 to 200 ⁇ m, about 50 to 85 ⁇ m, about 50 to 75 ⁇ m, about 50 to 70 ⁇ m, about 55 to 200 ⁇ m, about 55 to 85 ⁇ m, about 55 to 75 ⁇ m, and about 55 to 70 ⁇ m.
• the exterior film 50 has high formability, which makes deep drawing easy and can contribute to increasing the capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, even more preferably about 30 ⁇ m or less, and particularly preferably about 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more.
• Preferred ranges for the thickness of the stainless steel foil include about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, and about 15 to 25 ⁇ m.
• the barrier layer 52 when the barrier layer 52 is a metal foil, it is preferable that at least the surface opposite to the base layer 51 is provided with a corrosion-resistant film in order to prevent dissolution and corrosion.
• the barrier layer 52 may be provided with a corrosion-resistant film on both sides.
• the corrosion-resistant film refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the barrier layer 52 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment with nickel or chromium, or corrosion prevention treatment by applying a coating agent on the surface of the barrier layer 52.
• the corrosion-resistant film means a film that improves the acid resistance of the barrier layer 52 (acid-resistant film), a film that improves the alkali resistance of the barrier layer 52 (alkali-resistant film), etc.
• the treatment for forming the corrosion-resistant film may be one type, or two or more types may be combined. In addition, it is possible to form not only one layer but also multiple layers. Furthermore, among these treatments, hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved by a treatment agent to form metal compounds with excellent corrosion resistance. Note that these treatments may also be included in the definition of chemical conversion treatment. Also, if the barrier layer 52 has a corrosion-resistant coating, 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 base layer 51 during molding of the exterior film 50, prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by the reaction between the electrolyte and moisture, and in particular prevents dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 52 when the barrier layer 52 is an aluminum alloy foil, and improves the adhesion (wettability) of the surface of the barrier layer 52, preventing delamination between the base layer 51 and the barrier layer 52 during heat sealing and between the base 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 the exterior film 50 with heat-sealing sealability.
• Examples of the heat-sealable resin layer 53 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, cyclic polyolefin resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the standpoint of sealability and strength, the thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 has one or more layers with a buffer function (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 via the base layer 51, the barrier layer 52, etc.
• the material constituting the buffer layer can be selected from any material having cushioning properties.
• the material having cushioning properties is, for example, rubber, nonwoven fabric, or foam sheet.
• the rubber is, for example, natural rubber, fluororubber, or silicone rubber.
• the rubber hardness is preferably about 20 to 90.
• the material constituting the nonwoven fabric is preferably a material having excellent heat resistance.
• the lower limit of the thickness of the buffer layer is preferably 100 ⁇ m, more preferably 200 ⁇ m, and even more preferably 1000 ⁇ m.
• the upper limit of the thickness of the buffer layer is preferably 5000 ⁇ m, and even more preferably 3000 ⁇ m.
• the preferred range of thickness of the buffer layer is 100 ⁇ m to 5000 ⁇ m, 100 ⁇ m to 3000 ⁇ m, 200 ⁇ m to 5000 ⁇ m, 200 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 5000 ⁇ m, or 1000 ⁇ m to 3000 ⁇ m.
• the most preferred range of thickness of the buffer layer is 1000 ⁇ m to 3000 ⁇ m.
• the lower limit of the thickness of the buffer layer is preferably 0.5 mm.
• the upper limit of the thickness of the buffer layer is preferably 10 mm, more preferably 5 mm, and even more preferably 2 mm.
• the preferred range of the thickness of the buffer layer is 0.5 mm to 10 mm, 0.5 mm to 5 mm, or 0.5 mm to 2 mm.
• the buffer layer functions as a cushion, preventing the exterior film 50 from being damaged by impact when the energy storage device 10 is dropped or by handling during the manufacture of the energy storage device 10.
• the first sealing portion 70 is formed by heat sealing the mutually facing surfaces (heat-sealable resin layer 53) of the exterior film 50 wrapped around the electrode body 20 and the lid body 60.
• 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 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 is folded, for example, toward the second surface 42 of the exterior body 40. In a plan view, the first sealing portion 70 may protrude outward beyond the electrode body 20, or may be folded toward the first surface 41.
• FIG. 4 is a perspective view showing a schematic configuration of the end of the exterior film 50 in the FB direction.
• the exterior film 50 has a first seal area 500.
• the first seal area 500 is a virtual area that exists in the peripheral portion of the opening 40A, and the heat-sealable resin located in the first seal area 500 forms the second seal area 80 by being heat-sealed with the lid seal part 63 of the lid body 60 described later.
• the first seal area 500 includes a peripheral portion 5000 that defines the periphery of the opening 40A.
• the second seal area 80 is an example of the seal part of the present invention. Note that FIG. 4 shows only one end of the exterior film 50 in the FB direction, but the other end of the exterior film 50 in the FB direction also has the first seal area 500.
• [Lid] 5 is a perspective view showing a schematic configuration of the lid body 60.
• the lid body 60 is a member arranged to close the opening 40A, and is, for example, a plate having a polygonal shape when viewed from the FB direction of the power storage device 10.
• the lid body 60 is, for example, made of resin.
• the lid body 60 may be formed by, for example, cold forming the exterior film 50.
• the lid body 60 may be a metal molded product.
• the material constituting the lid body 60 may include at least one of metal, metal oxide, carbon fiber reinforced plastic, and rubber.
• the lid body 60 has a first surface 61, a second surface 62, and a lid seal portion 63.
• the first surface 61 faces the electrode body 20.
• the second surface 62 is the surface opposite the first surface 61.
• the lid seal portion 63 is connected to the first surface 61 and the second surface 62, and is heat-sealed to the heat-fusible resin layer 53 of the exterior film 50 to form a second sealing portion 80.
• the lid seal portion 63 is an example of the second sealing region of the present invention.
• the lid seal portion 63 includes a first seal surface 63A, a second seal surface 63B, a third seal surface 63C, and a fourth seal surface 63D.
• the first seal surface 63A constitutes the upper surface of the lid body 60.
• the first seal surface 63A extends in a first direction (LR direction in this embodiment) in a front view of the lid body 60.
• the second seal surface 63B and the third seal surface 63C are connected to the first seal surface 63A and constitute the side surface of the lid body 60.
• the second seal surface 63B and the third seal 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 seal surface 63D constitutes the lower surface of the lid body 60.
• the fourth sealing 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 degree of thickness 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 lid seal portion 63 of the lid body 60 has a certain degree of thickness so that the lid seal portion 63 of the lid body 60 and the exterior film 50 can be suitably heat-sealed when forming the second sealing portion 80.
• the minimum value of the thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum value of the thickness of the lid body 60 is, for example, 20 mm, more preferably 15 mm, and even more preferably 12 mm.
• the preferred ranges for the thickness of the material constituting the lid body 60 are 1.0 mm to 20 mm, 1.0 mm to 15 mm, 1.0 mm to 12 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 12 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, and 4.0 mm to 12 mm.
• the lid body 60 when the lid body 60 is described as being plate-shaped, this does not include a case in which the lid body 60 is composed only of a film as defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the thickness of the lid body 60 may vary depending on the part of the lid body 60. When the thickness of the lid body 60 varies depending on the part, the thickness of the lid body 60 is the thickness of the thickest part.
• the lid seal portion 63 further includes boundaries 64, 65, 66, and 67.
• Boundary 64 is the boundary between the first seal surface 63A and the second seal surface 63B.
• Boundary 65 is the boundary between the first seal surface 63A and the third seal surface 63C.
• Boundary 66 is the boundary between the fourth seal surface 63D and the second seal surface 63B.
• Boundary 67 is the boundary between the fourth seal surface 63D and the third seal surface 63C.
• boundaries 64 to 67 form the top of the lid body 60.
• the shapes of boundaries 64 to 67 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 64 to 67 are angular.
• the material constituting the lid body 60 and the material constituting the heat-sealable resin layer 53 of the exterior film 50 are mainly made of the same material.
• the material constituting the lid body 60 and the material constituting the heat-sealable resin layer 53 are mainly made of polypropylene.
• the second sealing portion 80 according to this embodiment is formed mainly from polypropylene.
• the main material refers to a material that, for example, occupies 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 total material contained in the constituent elements is taken as 100% by mass.
• the lid body 60 is formed with a through hole 60X into which the electrode terminal 30 described later is inserted.
• the through hole 60X penetrates the first surface 61 and the second surface 62.
• the electrode terminal 30 protrudes to the outside of the exterior body 40 through the through hole 60X formed in the lid body 60.
• a small gap between the through hole 60X of the lid body 60 and the electrode terminal 30 is filled with, for example, resin.
• the position at which the electrode terminal 30 protrudes to the outside can be selected arbitrarily.
• the electrode terminal 30 may protrude to the outside from a hole formed in any one of the six surfaces of the exterior body 40.
• a small gap between the exterior body 40 and the electrode terminal 30 is filled with, for example, resin.
• the lid body 60 and the electrode terminal 30 are provided as separate bodies, but the lid body 60 and the electrode terminal 30 may be formed integrally. If the electrode terminal 30 does not protrude from the edge of the exterior body 40, the through hole 60X does not need to be formed in the cover body 60.
• the power storage device 10 includes a pair of electrode terminals 30.
• the electrode terminals 30 are metal terminals used for inputting and outputting electric power in the electrode body 20.
• One end of the electrode terminal 30 is electrically connected to the electrode body 20 (positive electrode or negative electrode).
• the other end of the electrode terminal 30 protrudes outward from an edge of the exterior body 40, for example.
• the electrode terminal 30 may not protrude from the exterior body 40, for example, as long as it is capable of inputting and outputting electric power to and from the electrode body 20.
• the lid body 60 described later is made of, for example, a metal
• the lid body 60 may also function as the electrode terminal 30.
• the lid body 60 having the function as an electrode terminal may or may not protrude from the exterior body 40.
• the metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, copper, etc.
• the electrode terminal 30 connected to the positive electrode is usually made of aluminum, etc.
• the electrode terminal 30 connected to the negative electrode is usually made of copper, nickel, etc.
• FIG. 6 is a front view showing the configuration around the lid body 60.
• the electricity storage device 10 further includes one or more seal reinforcement parts 90.
• the seal reinforcement parts 90 are parts that reinforce the sealing by the second sealing part 80.
• the seal reinforcement parts 90 are formed between the first sealing area 500 of the exterior film 50 and the lid seal part 63 (second sealing area) of the lid body 60, at least in a part where the second sealing part 80 is not formed.
• the part where the second sealing part 80 is not formed may be one place or two or more places.
• the second sealing portion 80 is formed in a state where the lid seal portion 63 and the first sealing region 500 face each other and the entire lid seal portion 63 is wrapped in the exterior film 50.
• the length of the lid seal portion 63 i.e., the circumferential length of the lid body 60
• the sagging portions are the portions indicated by the symbols 501 and 502.
• the size of the sagging portions 501 and 502 is emphasized in FIG. 6, but the sagging portions 501 and 502 do not have to protrude from the surface of the exterior film 50 that forms the second sealing portion 80.
• the heat-sealing resin of the lid seal portion 63 and the heat-sealing resin of the first sealing region 500 do not come into sufficient contact with each other, and an unsealed portion where the second sealing portion 80 is not formed is likely to occur. If such an unsealed portion exists, when the electrode body 20 contains an electrolyte, the electrolyte may leak out of the exterior body 40, or at least one of gas and moisture may penetrate into the interior of the exterior body 40, which may have an undesirable effect on the performance of the electricity storage device 10.
• the seal reinforcement portion 90 compensates for the unsealed portion that may cause a decrease in the performance of the electricity storage device 10, and improves the seal between the lid body 60 and the exterior film 50.
• the unsealed portion is not necessarily limited to one caused by sagging of the exterior film 50, but may be one caused by other reasons or one that is intentionally formed, for example, for the convenience of manufacturing.
• two seal reinforcement parts 90 are formed in the sagging parts 501 and 502 to fill the gap between the lid seal part 63 and the first seal area 500.
• the seal reinforcement part 90 formed in the sagging part 501 more effectively improves the seal between the lid body 60 and the exterior film 50 compared to the seal reinforcement part 90 formed in the sagging part 502.
• the sagging part 501 is located closer to the protruding part 50X (first sealing part 70). Since the protruding part 50X is movable relative to the root 70X of the first sealing part 70, a larger load is applied to the second sealing part 80 near the root 70X compared to other parts. In other words, there is a greater need to reinforce the seal by the second sealing part 80 near the root 70X. For this reason, it can be said that a seal reinforcement part 90 formed closer to the base 70X is more effective at improving the seal between the lid body 60 and the exterior film 50 than a seal reinforcement part 90 formed further away from the base 70X.
• the seal reinforcement portion 90 is formed by a method described later.
• the material forming the seal reinforcement portion 90 includes, for example, at least one of resin, metal, ceramic, and rubber.
• the material also includes, for example, a mixture of at least two of resin, metal, ceramic, and rubber, and a composite of at least two of resin, metal, ceramic, and rubber.
• the composite includes, for example, a material in which different materials are bonded at the molecular level.
• the resin includes at least one of thermoplastic resin, photocurable resin, room temperature curable resin, thermosetting resin, and electron beam curable resin (hereinafter, these resins may be collectively referred to as "curable resin").
• thermoplastic resin examples include polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin, polyolefin resins such as polyethylene resin and polypropylene resin, cyclic polyolefin resin, and acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• Photocurable resin is a resin that hardens when irradiated with light of a specific wavelength.
• photocurable resins examples include radical polymerization resins that are cured by radical chain reaction with functional groups of monomers or oligomers when irradiated with ultraviolet light, which causes radicalization of a photopolymerization initiator, and cationic polymerization resins that are cured by initiating a cationic polymerization reaction when irradiated with ultraviolet light.
• radical polymerization resins include acrylic resins
• examples of cationic polymerization resins include epoxy resins and vinyl ether.
• room temperature curable resins include resins that are mainly made of epoxy resins, ester resins, or acrylic resins and are cured by mixing with a curing agent.
• thermosetting resins include phenol resins, epoxy resins, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, silicone resins, polyurethanes, and thermosetting polyimides.
• electron beam curable resins include acrylic resins.
• Manufacturing method of electricity storage device> 7A 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 according to the first embodiment will be described below.
• the order of performing the following steps S1 to S8 is not limited to the following order and can be changed as appropriate.
• each element of the energy storage device 10 is prepared. Specifically, the electrode body 20, a pair of electrode terminals 30, an exterior film 50, and a pair of lid bodies 60 are prepared.
• each electrode terminal 30 is joined to the lid body 60.
• each electrode terminal 30 is joined to the lid body 60 so as to protrude toward the second surface 62 through the through hole 60X.
• the gap between the peripheral surface of the electrode terminal 30 and the inner wall surface of the through hole 60X of the lid body 60 may be filled with resin.
• step S2 results in the creation of a lid unit 600 (see FIG. 7B) in which the electrode terminal 30 is joined to the lid body 60.
• step S3 the lid unit 600 is placed so as to face the front 21 and back 22 of the electrode body 20, and the electrode terminal 30 and the electrode body 20 are joined.
• the method for manufacturing the electricity storage device 10 may include a step of first joining the electrode body 20 and the electrode terminal 30, and then joining the lid body 60 to the electrode terminal 30 joined to the electrode body 20.
• the electrode terminal 30 may protrude outside the exterior body 40 from between any of the sealing surfaces 63A to 63D and the exterior film 50.
• step S4 the electrode body 20 is wrapped in the exterior film 50 so as to form a pair of openings 40A.
• the method for wrapping the electrode body 20 is not particularly limited, and for example, the exterior film 50 may be wrapped around the electrode body 20 and the lid body 60.
• the portion of the exterior film 50 located on the periphery of the opening 40A becomes the first seal area 500.
• the first seal area 500 faces the lid seal portion 63 of the pair of lid bodies 60.
• step S5 the opposing heat-sealable resin layers 53 of the exterior film 50 are heat-sealed to form a first sealing portion 70 (hereinafter referred to as a "temporary first sealing portion") having an unsealed portion in part.
• the unsealed portion can be formed, for example, by using a seal bar shaped so that a part of it does not come into contact with the exterior film 50.
• the unsealed portion can be formed by interposing a fluororesin film or the like between the opposing surfaces (heat-sealable resin layers 53) of the exterior film 50.
• the electrode body 20 can be held by the exterior film 50, so that the position of the electrode body 20 relative to the exterior film 50 is less likely to shift. This suppresses the occurrence of wrinkles when forming the second sealing portion 80.
• step S6 the second sealing portion 80 is formed.
• the second sealing portion 80 is formed by heat sealing the heat-fusible resin layer 53 of the first sealing region 500 of the exterior film 50 and the lid seal portion 63 of the lid body 60. Note that step S6 may be performed before step S5.
• step S7 the seal reinforcement portion 90 is formed. More specifically, in step S6, the material for forming the seal reinforcement portion 90 is injected into the portion (unsealed portion of the second sealing portion 80) between the first sealing region 500 and the lid sealing portion 63 where the second sealing portion 80 has not been formed.
• the portion where the second sealing portion 80 has not been formed is identified, for example, by a leak test or the like.
• the injection of the material for forming the seal reinforcement portion 90 can be performed, for example, by injecting the material in a fluid state into the unsealed portion of the second sealing portion 80 using a nozzle or the like, and then solidifying the material. Alternatively, the material in a fluid state can be pressed into the unsealed portion of the second sealing portion 80 by pressure. As a result, the seal reinforcement portion 90 is formed in the unsealed portion of the second sealing portion 80.
• step S8 electrolyte is injected through the unsealed portion of the temporary first sealing portion, and aging and degassing are performed. Note that if the energy storage device 10 is an all-solid-state battery, the process of injecting electrolyte through the unsealed portion of the temporary first sealing portion is omitted.
• step S9 the exterior film 50 is evacuated as necessary, and the unsealed portion of the temporary first sealed portion is then heat sealed to form the first sealed portion 70.
• the power storage device 10A of the second embodiment is different from the first embodiment in the configuration and formation method of a seal reinforcement portion 90A, but other configurations are similar to those of the first embodiment.
• FIG. 8 is a perspective view showing the configuration around the lid body 60 of the power storage device 10A of the second embodiment (however, the electrode terminal 30 is omitted).
• the seal reinforcement part 90A covers the entire first seal area 500 and the second seal area (the lid seal part 63 of the lid body 60) from the outside of the exterior film 50, and further covers the entire second surface 62 of the lid body 60.
• the seal reinforcement part 90A extends in the FB direction of the power storage device 10A and reaches the position where the corner part 230 of the electrode body 20 is present on the outer surface of the exterior film 50.
• the seal reinforcement part 90A covers at least one of the multiple corner parts 230 of the electrode body 20 from the outside of the exterior film 50. Note that only the configuration around one of the lid bodies 60 is shown in FIG. 8, but the configuration around the other lid body 60 is similar.
• the seal reinforcement portion 90A is formed to an extent that reaches a portion of the protrusion portion 50X. In this way, when the seal reinforcement portion 90A is formed to reach at least a portion of the protrusion portion 50X, the seal reinforcement portion 90A can also reinforce the protrusion portion 50X, particularly its base. However, the seal reinforcement portion 90A may be formed excluding the protrusion portion 50X.
• the material for forming the seal reinforcement portion 90A can be the same as the material for forming the seal reinforcement portion 90.
• the manufacturing method of the power storage device 10A according to the second embodiment is different from the manufacturing method of the power storage device 10 in the method of forming the seal reinforcement portion 90. That is, the manufacturing method of the power storage device 10A is different from the manufacturing method of the power storage device 10 in the specific content of step S7. This will be described below.
• the container 990 shown in FIG. 9 is a container capable of housing the lid body 60 and its periphery, and can be, for example, a flexible container made of silicone resin.
• the lid body 60 and its periphery on one side of the power storage device 10A assembled in the process up to step S6 are housed in the container 990, and the material 91 (in a fluid state) for forming the seal reinforcement portion 90A is poured therein, and the lid body 60 including the entire first sealing area 500 and the entire second sealing area (lid seal portion 63) is impregnated with the material 91.
• the lid body 60 and the like are removed from the container 990, and excess material 91 is removed.
• the first sealing area 500 and the lid seal portion 63, including the unsealed portion of the second sealing portion 80 are covered from the outside by the seal reinforcement portion 90A.
• the seal reinforcement portion 90A can be formed so as to cover at least one of the corners 230 from the outside of the exterior film 50.
• the bottom of the container 990 may have a slit (not shown) formed therein for the electrode terminal 30 to pass through.
• a slit (not shown) formed therein for the electrode terminal 30 to pass through.
• the seal reinforcement portion 90A When the seal reinforcement portion 90A extends over the outer surface of the exterior film 50 so as to cover at least one of the corners 230 of the electrode body 20, the seal reinforcement portion 90A can be formed from a material with relatively low stretching and deformability, thereby imparting an additional function to the seal reinforcement portion 90A that suppresses deformation of the exterior body 40.
• the internal pressure of the electricity storage device 10A may increase due to volume changes of the positive electrode active material and the negative electrode active material of the electrode body 20 accompanying charging and discharging, and gas generation, etc.
• the exterior body 40 When the internal pressure of the electricity storage device 10A increases, the exterior body 40 may expand.
• the exterior body 40 when vacuum drawing is performed in the manufacturing process of the electricity storage device 10B, the exterior body 40 may shrink. Since the seal reinforcement portion 90A extends over the outer surface of the exterior film 50 and reinforces the exterior film 50 at least in that portion, the above-mentioned deformation of the exterior body 40 can be limited.
• the power storage device 10B of the third embodiment is different from the first embodiment in the configuration and formation method of a seal reinforcement portion 90B, but other configurations are similar to those of the first embodiment.
• FIG. 10 is a perspective view showing the configuration around the lid body 60 of the power storage device 10B of the third embodiment (however, the electrode terminal 30 is omitted).
• the seal reinforcement portion 90B covers the entire first seal area 500 and the entire second seal area (the lid seal portion 63 of the lid body 60) from the outside of the exterior film 50, and further covers the entire second surface 62 of the lid body 60.
• the seal reinforcement portion 90B extends in the FB direction of the power storage device 10B and reaches the position where the corner portion 230 of the electrode body 20 is present on the outer surface of the exterior film 50.
• the seal reinforcement portion 90B covers at least one of the multiple corner portions 230 of the electrode body 20 from the outside of the exterior film 50. Note that only the configuration around one of the lid bodies 60 is shown in FIG. 10, but the configuration around the other lid body 60 is similar.
• seal reinforcement portion 90B is formed by placing a reinforcing member configured separately from exterior film 50 on the outside of exterior film 50 and lid body 60.
• the material forming seal reinforcement portion 90B may include, for example, resin, metal, rubber, metal oxide, a compound of metal oxide and resin, carbon fiber reinforced plastic, etc.
• seal reinforcement portion 90B is preferably formed including a material that is impermeable to electrolyte or a material that is resistant to electrolyte.
• seal reinforcement portion 90B is preferably formed including a material that is impermeable to gas and moisture, or including a layer that is impermeable to gas and moisture.
• the shape and thickness of the seal reinforcement part 90B are not particularly limited.
• the seal reinforcement part 90B may be formed, for example, in a sheet shape. In this case, for example, a plurality of seal reinforcement parts 90B can be joined to the outside of the lid body 60 or the exterior film 50.
• the sheet-shaped seal reinforcement part 90B can be made of, for example, a resin film.
• the resin film may be a single-layer film or a multi-layer film.
• the seal reinforcement part 90B may be formed in a cap shape that can be placed on the end of the exterior body 40 from the outside of the lid body 60.
• the cap-shaped seal reinforcement part 90B can be made of, for example, rubber, a molded resin product, ceramics, metal, and a resin film (including a cold-formed product). In this way, the seal reinforcement part 90B may be made of one part as a whole, or may be made of two or more parts made of the same material or different materials. Furthermore, the thickness with which the seal reinforcement part 90B covers the exterior film 50 and the lid body 60 is not particularly limited.
• the seal reinforcement part 90B may or may not be bonded to the exterior body 40 (at least one of the lid body 60 and the exterior film 50).
• the seal reinforcement part 90B contains an elastic material such as rubber and is formed in a cap shape
• the seal reinforcement part 90B can be attached to the end part of the exterior body 40 by itself by utilizing the elasticity of the seal reinforcement part 90B.
• the bonding method is not particularly limited.
• Examples of bonding methods include a method of interposing an adhesive between the seal reinforcement part 90B and the exterior body 40, a method of pouring the above-mentioned hardening resin between the seal reinforcement part 90B and the exterior body 40 and hardening it, and a method of fusing the seal reinforcement part 90B and the exterior body 40 with a heat-sealing resin.
• the seal reinforcement part 90B can be combined with the seal reinforcement part 90 of the first embodiment or the seal reinforcement part 90A of the second embodiment.
• the seal reinforcement portion 90B is formed in a portion excluding the protrusion portion 50X.
• the seal reinforcement portion 90B may be formed to an extent that reaches at least a portion of the protrusion portion 50X. In this way, when the seal reinforcement portion 90B is formed to reach at least a portion of the protrusion portion 50X, the seal reinforcement portion 90B can also reinforce the protrusion portion 50X, particularly its base.
• the seal reinforcement part 90B can be given an additional function of suppressing deformation of the exterior body 40.
• the internal pressure of the electricity storage device 10B may increase due to volume changes of the positive electrode active material and the negative electrode active material of the electrode body 20 accompanying charging and discharging, and gas generation, etc.
• the exterior body 40 may expand.
• the seal reinforcement part 90B which has relatively low elastic deformation, is present on the outside of the exterior film 50, the expansion of the exterior body 40 can be limited.
• the exterior body 40 may shrink.
• the seal reinforcement part 90B is at least partially joined to the exterior film 50, the seal reinforcement part 90B reinforces the exterior film 50 in that portion, so that the contraction of the exterior body 40 can be limited.
• the electricity storage device 10C of the fourth embodiment differs from the third embodiment in that a seal reinforcement portion 90C covers at least one of the ridge portions 20A to 20D from the outside of the exterior body 40, but the other configuration is similar to that of the third embodiment.
• the electricity storage device 10C of the fourth embodiment will be described below, focusing on the parts that differ from the third embodiment.
• FIG. 11 is a perspective view showing a schematic configuration of the power storage device 10C (however, the electrode terminal 30 is omitted).
• the seal reinforcement portion 90C has two end reinforcement portions 900C that cover both ends of the exterior body 40 in the FB direction.
• the power storage device 10C of the fourth embodiment further has four ridge reinforcement portions 901C that cover the ridge portions 20A to 20D of the electrode body 20 from the outside of the exterior body 40.
• the end reinforcement portions 900C each cover the entire first seal area 500 and the second seal area (the lid seal portion 63 of the lid body 60) from the outside of the exterior film 50, and further cover the entire second surface 62 of the lid body 60.
• the ridge reinforcement portions 901C each cover at least a part of the ridge portions 20A to 20D of the electrode body 20 from the outside of the exterior body 40.
• the ridge reinforcement portion 901C is connected to each of the two end reinforcement portions 900C.
• materials constituting the two end reinforcement portions 900C and the ridge reinforcement portion 901C the same materials as those exemplified in the description of the seal reinforcement portion 90B of the third embodiment can be used.
• the ridge reinforcement 901C is preferably formed to be L-shaped when viewed from the FB direction so as to span the two faces forming the ridges 20A to 20D. However, in the portion of the protruding portion 50X, the ridge reinforcement 901C may be formed only on one face side of the protruding portion 50X.
• the ridge reinforcement 901C may be formed integrally with the both end reinforcement 900C, or may be formed separately from the both end reinforcement 900C and joined to at least one of the outer surface of the exterior body 40 and the both end reinforcement 900C.
• the exterior body 40 in a state in which the electrode body 20 is sealed can be fitted into the space defined by the both end reinforcement 900C and the ridge reinforcement 901C to manufacture the electricity storage device 10C having the seal reinforcement 90C.
• the both end reinforcement parts 900C and the ridge reinforcement part 901C are formed as separate bodies, the both end reinforcement parts 900C and the ridge reinforcement part 901C may be combined in advance, and the exterior body 40 in a state in which the electrode body 20 is sealed may be fitted into the space defined by the both end reinforcement parts 900C and the ridge reinforcement part 901C.
• the both end reinforcement parts 900C and the ridge reinforcement part 901C may be attached to the exterior body 40, and then connected.
• the both end reinforcement parts 900C and the ridge reinforcement part 901C may be connected to each other by inserting a convex part formed on one side into a concave part formed on the other side, by fixing the two parts with an adhesive, or by fusing the two parts with a heat-sealing resin.
• the both end reinforcement parts 900C and the ridge reinforcement part 901C may simply be joined to the exterior body 40. The joining method to the exterior body 40 is as described in the second embodiment.
• the both end reinforcement portions 900C extend in the FB direction of the power storage device 10B and reach the position on the outer surface of the exterior film 50 where the corners 230 of the electrode body 20 are located. That is, it is preferable that the both end reinforcement portions 900C cover at least one of the multiple corners 230 of the electrode body 20 from the outside of the exterior film 50. However, the both end reinforcement portions 900C may not reach the position where the corners 230 of the electrode body 20 are located, and the ridge reinforcement portion 901C may cover at least one of the corners 230 of the electrode body 20 from the outside of the exterior film 50.
• the corner portion 230 can be prevented from breaking through the exterior film 50 and protruding. Furthermore, since the ridge line reinforcing portion 901C covers from the outside of the exterior film 50 the portions of the ridge line portions 20A to 20D of the electrode body 20 that are not covered by the both-end reinforcing portions 900C, it is possible to prevent the ridge line portions 20A to 20D of the electrode body 20 from breaking through and protruding from the exterior film 50.
• the ridge line reinforcing portion 901C does not have to be formed corresponding to all of the ridge lines of the ridge line portions 20A to 20D, and the above effect can be achieved even if only one is formed corresponding to any one of the ridge line portions.
• the seal reinforcement part 90C can deform in accordance with the expansion and contraction of the exterior body 40 that occurs during the manufacture and use of the energy storage device 10C. More specifically, in the energy storage device 10C, the internal pressure of the energy storage device 10C may increase due to volume changes in the positive and negative active materials of the electrode body 20 accompanying charging and discharging, and gas generation, etc. When the internal pressure of the energy storage device 10C increases, the exterior body 40 may expand and the exterior film 50 may elongate. In addition, when vacuum drawing is performed in the manufacturing process of the energy storage device 10C, the exterior film 50 may deform due to the contraction of the exterior body 40. If the seal reinforcement part 90C can follow such deformation of the exterior body 40, the seal reinforcement part 90C is less likely to separate from the exterior film 50. This makes it easier for the seal reinforcement part 90C to achieve the above effects more reliably.
• seal reinforcement portion 90C has the additional effect of suppressing deformation of exterior body 40. Specifically, by having seal reinforcement portion 90C, which has relatively low elastic deformation, on the outside of exterior film 50, the above-mentioned expansion of exterior body 40 can be limited. Furthermore, when seal reinforcement portion 90C is at least partially joined to exterior film 50, seal reinforcement portion 90C reinforces exterior film 50 in that portion, thereby limiting the above-mentioned contraction of exterior body 40.
• the above-mentioned embodiments are examples of possible forms of the electricity storage device and the manufacturing method of the electricity storage device according to the present invention, and are not intended to limit the forms.
• the electricity storage device and the manufacturing method of the electricity storage device according to the present invention may take forms different from those exemplified in the respective embodiments.
• One example is a form in which a part of the configuration of each embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to each embodiment.
• Some examples of modified forms of each embodiment are shown below.
• the above-mentioned embodiments and the following modified forms can be combined with each other as long as there is no technical contradiction.
• the seal reinforcement portion 90A does not have to cover the entire first seal area 500 and the entire lid seal portion 63, and may at least partially cover the first seal area 500 and the lid seal portion 63. More specifically, as long as the seal reinforcement portion 90A covers the peripheral portion 5000 (see FIG. 4) of the exterior film 50 that is the periphery of the opening 40A and the portion of the lid seal portion 63 that faces the peripheral portion 5000, the effect of reinforcing the seal by the second sealing portion 80 is achieved. In other words, the seal reinforcement portion 90A does not have to cover the entire first seal area 500 and the entire lid seal portion 63 in the FB direction of the energy storage device 10.
• the seal reinforcement 90A may not cover the peripheral portion 5000 and the portion of the lid seal portion 63 facing the peripheral portion 5000 over the entire circumferential direction of the opening 40A.
• the seal reinforcement 90B of the third embodiment and the seal reinforcement 90C of the fourth embodiment may not cover the entire second surface 62 of the lid body 60. That is, as long as the seal reinforcement 90A to 90C are formed so as to cover the boundary between the exterior film 50 (first seal region 500) and the lid body 60 (lid seal portion 63) in the FB direction, the seal reinforcement 90A to 90C may not be formed in the center of the lid body 60.
• seal reinforcement 90A to 90C may simply be formed so as to cover at least one apex (boundary 64 to 67) of the lid body 60 and its periphery. This is because unsealed areas of the second sealing section 80 are particularly likely to occur at the top of the lid 60.
• the manufacturing method of the power storage device 10A of the second embodiment is not limited to that of the above embodiment.
• the container 990 may first be filled with a fluidized material 91, at least a part of the first seal region 500 and at least a part of the second seal region 500 may be impregnated with the filled material 91, and then the material 91 may be removed and then solidified.
• the seal reinforcement portion 90B and the both end reinforcement portions 900C may further have a cushioning material for protecting the corners 230 of the electrode body 20.
• FIG. 12 is a diagram showing an example of the configuration of the cushioning material.
• the cushioning material 92 is formed in an L-shape when viewed from the FB direction, and covers the corners 230 from the UD direction and the LR direction.
• the cushioning material 93 is formed in a plate shape when viewed from the UD direction, and is arranged, for example, on the upper surface of the protruding portion 50X (the surface on the first surface 41 side of the exterior body 40).
• the cushioning materials 92 and 93 are fixed to the outside of the seal reinforcement portion 90B or the both end reinforcement portions 900C, respectively, cover the corners 230 of the electrode body 20, and reduce impacts applied to the exterior film 50 from the outside. For this reason, it is preferable that the cushioning materials 92 and 93 are made of an elastic material such as rubber or elastomer.
• the seal reinforcement portion 90B and the both end reinforcement portions 900C do not have to reach the corners 230, and it is sufficient that the cushioning material 92 or 93 covers the corners 230.
• the cushioning material 92 may be fixed to the seal reinforcement portion 90B or the both end reinforcement portions 900C so as to be aligned with the lower surface of the protrusion portion 50X and the second surface 42 of the exterior body 40.
• the cushioning material 93 may be fixed to the seal reinforcement portion 90B or the both end reinforcement portions 900C so as to be aligned with the lower surface of the protrusion portion 50X.
• the cushioning material 92 or 93 may be fixed to the inside (closer to the exterior film 50) of the seal reinforcement portion 90B or the both end reinforcement portions 900C, rather than to the outside.
• the external shape of the exterior body 40 can be changed as desired.
• the lid body 60 does not have to be substantially rectangular when viewed from the FB direction of the energy storage device 10, and may be another substantially polygonal shape, or a shape other than a substantially polygonal shape, such as a substantially circular shape or a substantially elliptical shape.
• the shape of the lid body 60 may be changed, for example, according to the three-dimensional shape of the electrode body 20.
• an adhesive film (not shown) may be bonded to the outer peripheral surface of the electrode terminal 30.
• Any adhesive film can be selected as long as it can bond the electrode terminal 30 made of metal and the lid body 60 made of, for example, resin.
• the adhesive film can be, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the adhesive film can be a single layer or two or more layers of these films.
• the exterior film 50 may be formed in advance as a cylindrical body having an opening 40A, and the electrode body 20 and the lid body 60 may be disposed inside the cylindrical body. This is common to the energy storage devices 10, 10A to 10C according to the first to fourth embodiments.
• the energy storage device 10B having the cap-shaped reinforcing member of the third embodiment can be manufactured, for example, by modifying the manufacturing method of the energy storage device 10 of the first embodiment as follows.
• step S1 the electrode body 20, a pair of electrode terminals 30, an exterior film 50, a pair of lid bodies 60, and a pair of reinforcing members that can be attached to the lid bodies 60 are prepared.
• step S8 each reinforcing member is attached to each lid body 60 to form a seal reinforcement portion 90B. Note that the preparation of the reinforcing members may be performed at a different timing from step S1, as long as it is performed before step S8.
• the seal reinforcement parts 90A to 90C of the second to fourth embodiments have the function of suppressing deformation of the exterior body 40 described above, the seal reinforcement parts 90A to 90C may be configured to selectively suppress deformation of a specific surface of the exterior body 4 depending on the manner in which the power storage devices 10A to 10C are used.
• the power storage devices 10A to 10C are used arranged such that one of the second surfaces 42 of the multiple power storage devices 10A to 10C (hereinafter, this will be referred to as the second surface 42B, and the other second surface 42 will be referred to as the second surface 42A) is in contact with the cooling mechanism 200, as shown in FIG.
• the power storage devices 10A to 10C arranged as shown in FIG.
• the second surface 42B is in contact with the cooling mechanism 200, and the first surface 41A is in direct contact with the first surface 41B of the adjacent power storage devices 10A to 10C, or indirect contact via a plate-like member, a cushioning material, or the like (one of the first surfaces 41 is referred to as the first surface 41A, and the other as the first surface 41B).
• the first surface 41A, the first surface 41B, and the second surface 42B of the exterior body 40 are relatively unlikely to expand even if the internal pressure of the power storage devices 10A to 10C increases.
• the second surface 42A of the exterior body 40 is not in contact with other elements such as the power storage devices 10A-10C, and is therefore prone to expansion when the internal pressure of the power storage devices 10A-10C increases.
• the seal reinforcement parts 90A-90C can be arranged to extend over a wider area on the second surface 42A of the exterior body 40 and joined to the outer surface of the exterior film 50, for example, to suppress expansion of the second surface 42A.
• the seal reinforcement parts 90A-90C can be configured to suppress expansion of a specific surface of the exterior body 40.
• the above configuration applies not only to the expansion of the exterior body 40, but also to its contraction.
• Electrode body 20A to 10C Ridge line portion 30: Electrode terminal 40: Exterior body 40A: Opening 50: Exterior film 60: Lid body 63: Sealing surface (second sealing area) 64-67: Boundary (top) 80: Second sealing portion (seal portion) 90, 90A to 90C: Seal reinforcement portion 230: Corner portion 500: First seal area

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• 2024
  • 2024-03-29 KR KR1020257026234A patent/KR20250168185A/ko active Pending
  • 2024-03-29 WO PCT/JP2024/013388 patent/WO2024204835A1/ja not_active Ceased
  • 2024-03-29 JP JP2024559859A patent/JP7622917B1/ja active Active
  • 2024-03-29 EP EP24780927.0A patent/EP4693642A1/en active Pending
  • 2024-03-29 CN CN202480023439.8A patent/CN120898312A/zh active Pending
  • 2024-12-05 JP JP2024212181A patent/JP2025023290A/ja active Pending

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