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
  • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
  • H01M50/141—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against humidity
• • 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
  • H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
• • 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
  • H01G11/80—Gaskets; Sealings
• • 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
  • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
  • H01M10/52—Removing gases inside the secondary cell, e.g. by absorption
• • 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
  • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
• • 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
  • H01M50/121—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
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
• • 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
  • H01M50/129—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 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
  • H01M50/131—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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
  • H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/148—Lids or covers characterised by their shape
  • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/155—Lids or covers characterised by the material
  • H01M50/157—Inorganic material
  • H01M50/159—Metals
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/155—Lids or covers characterised by the material
  • H01M50/16—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
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/184—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
  • H01M50/186—Sealing members characterised by the disposition of the sealing members
  • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/193—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
  • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/531—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
  • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
  • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/543—Terminals
  • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
  • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/543—Terminals
  • H01M50/562—Terminals characterised by the material
• • 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
• • 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.
• exterior materials are essential components for sealing the electrode body, such as the electrodes and electrolyte.
• metal exterior materials have been widely used as exterior materials for electricity storage devices.
• a film-like laminate in which a base layer, a barrier layer, an adhesive layer, and a heat-sealable resin layer are laminated in this order has been proposed as an exterior material for an electricity storage device that can be easily processed into a variety of shapes and can be made thin and lightweight (see, for example, Patent Document 1).
• recesses are generally formed by cold forming, and an electrode body such as an electrode or electrolyte is placed in the space formed by the recess.
• the heat-sealable resin layer is then heat-sealed to obtain an electricity storage device in which the electrode body is housed inside the exterior component for electricity storage devices.
• a barrier layer made of, for example, metal foil. By providing a barrier layer, it is possible to prevent moisture from penetrating from the outside of the barrier layer.
• the heat-sealable resin layer of the exterior member absorbs water before the electrode body is sealed with the exterior member, there is a risk that the moisture in the heat-sealable resin layer will penetrate into the electrode body after the electrode body is sealed.
• the power storage device is an all-solid-state battery
• gases such as hydrogen sulfide may be generated, depending on the type of solid electrolyte.
• the present invention aims to provide an electricity storage device that can achieve at least one of the following: preventing moisture from entering the electrode body, and absorbing gas generated from the electrode body.
• the electricity storage device comprises an electrode body, an electrode terminal connected to the electrode body, and an exterior body that seals the electrode body.
• the exterior body is formed of a film-like exterior member, and the exterior body includes a first sealing portion that is joined to the exterior member while the exterior member is wrapped around the electrode body.
• the exterior member includes a barrier layer.
• the electricity storage device has a resin film for electricity storage devices that is arranged at least partially inside the barrier layer.
• the resin film for electricity storage devices includes at least one of a water absorbing agent and a gas absorbing agent.
• the electricity storage device according to the second aspect of the present invention is the electricity storage device according to the first aspect, in which the resin film for the electricity storage device is used as a heat-sealable resin layer of the exterior member.
• the electricity storage device is the electricity storage device according to the first or second aspect, in which the resin film for the electricity storage device is used as a terminal adhesive film that joins the exterior member and the electrode terminal.
• the electric storage device is an electric storage device according to any one of the first to third aspects, further comprising a lid body to which the electrode terminal is attached and which is disposed to the side of the electrode body, and a portion of the lid body is joined to the exterior member.
• the fifth aspect of the present invention relates to an electricity storage device according to the fourth aspect, in which the material constituting the lid body includes at least one of a resin material and a metal material.
• the electricity storage device is the electricity storage device according to the fourth or fifth aspect, in which the resin film for the electricity storage device is disposed at least partially between the lid body and the electrode body.
• the seventh aspect of the present invention is an electricity storage device according to any one of the fourth to sixth aspects, in which the resin film for electricity storage devices is disposed at least partially between the lid and the electrode terminal.
• the electricity storage device is an electricity storage device according to any one of the fourth to seventh aspects, in which the resin film for the electricity storage device is disposed at least partially between the lid and the exterior member.
• the electricity storage device is an electricity storage device according to any one of the fourth to eighth aspects, in which the lid has a hole through which the electrode terminal passes, and the resin film for electricity storage devices is disposed in the hole.
• the electricity storage device is an electricity storage device according to any one of the fourth to ninth aspects, in which the lid body includes a first surface facing the electrode body and a second surface opposite to the first surface, and the resin film for electricity storage devices is bonded to at least a portion of the second surface of the lid body.
• the present invention provides an electricity storage device that can achieve at least one of the following: preventing moisture from entering the electrode body; and absorbing hydrogen sulfide generated from the electrode body.
• FIG. 1 is a perspective view illustrating a power storage device according to a first embodiment.
• FIG. 1B is a cross-sectional view showing an example of a layer structure of the exterior member of FIG. 1A.
• FIG. 2 is a plan view illustrating a schematic diagram of the electricity storage device.
• FIG. 2 is a side view diagrammatically illustrating the electricity storage device.
• 13 is a side view showing a state in which a sheath member is wrapped around an electrode body during manufacture of the electricity storage device according to the first embodiment.
• FIG. 13 is a view showing a state in which a sheath member is wrapped around an electrode body during manufacture of the electricity storage device according to the first embodiment, as viewed from below.
• FIG. 3 is a diagram showing a schematic view of a part of the VI-VI cross section of FIG. 2.
• 11A to 11C are diagrams illustrating a method of forming a second sealing portion.
• FIG. 6 is a cross-sectional view showing another example taken along line VI-VI in FIG.
• FIG. 6 is a cross-sectional view showing yet another example taken along line VI-VI in FIG.
• FIG. 6 is a cross-sectional view showing yet another example taken along line VI-VI in FIG.
• FIG. 6 is a cross-sectional view showing yet another example taken along line VI-VI in FIG.
• FIG. 2 is a cross-sectional view showing an example of a layer structure of a resin film for an electricity storage device provided in the electricity storage device of the first embodiment.
• FIG. 4 is a cross-sectional view showing another example of a layer structure of the resin film for an electricity storage device provided in the electricity storage device of the first embodiment.
• FIG. 4 is a cross-sectional view showing still another example of the layer structure of the resin film for an electricity storage device provided in the electricity storage device of the first embodiment.
• 4 is a flowchart showing a manufacturing procedure of the electricity storage device according to the first embodiment.
• FIG. 11 is a plan view illustrating a power storage device according to a second embodiment.
• FIG. 2 is a side view diagrammatically illustrating the electricity storage device.
• FIG. 2 is a perspective view showing a typical cover body.
• 13A and 13B are diagrams showing a first example in which a lid body and an electrode terminal are integrally formed.
• FIG. 13A and 13B are diagrams showing a second example in which the lid and the electrode terminals are integrally formed.
• 10 is a flowchart showing a manufacturing procedure of an electricity storage device according to a second embodiment.
• 10 is a flowchart showing another manufacturing procedure for the electricity storage device according to the second embodiment.
• FIG. 11 is a side view showing a state in which an exterior member is wrapped around an electrode body in a third embodiment.
• FIG. 11 is a diagram showing a state in which an exterior member is wrapped around an electrode body and a lid body is attached to the exterior member, as viewed from below, in a third embodiment.
• 13 is a flowchart showing a manufacturing procedure of the electricity storage device according to the third embodiment.
• FIG. 13 is a plan view illustrating a power storage device according to a fourth embodiment.
• FIG. 13 is a side view diagrammatically illustrating an electricity accumulation device according to a fourth embodiment.
• FIG. 11 is a side view showing a state in which an exterior member is wrapped around an electrode body in a modified example.
• FIG. 13 is a perspective view that illustrates a modified example of an electricity storage device.
• 13 is a perspective view showing a schematic diagram of a lid body and an electrode terminal attached to the lid body according to a modified example.
• FIG. 13A to 13C are diagrams illustrating an insertion step in a manufacturing method for an electricity accumulation device according to a modified example.
• 13 is a perspective view showing a modified example of a cover and an electrode terminal attached to the cover.
• FIG. 24 is a perspective view that illustrates a schematic diagram of an electricity storage device to which the lid body of FIG. 23 is attached.
• FIG. 13 is a front view showing a schematic diagram of a cover according to another modified example.
• FIG. 13 is a front view showing a schematic diagram of a cover according to still another modified example.
• 13 is a cross-sectional view showing an example of arrangement of a resin film for an electricity storage device in an electricity storage device according to a second embodiment.
• FIG. 29B is a cross-sectional view showing another example of the arrangement of the resin film for an electricity storage device in the electricity storage device of FIG. 29A .
• 29B is a cross-sectional view showing still another example of an arrangement of the electricity storage device resin film in the electricity storage device of FIG. 29A .
• FIG. 29B is a cross-sectional view showing still another example of an arrangement of the electricity storage device resin film in the electricity storage device of FIG. 29A .
• FIG. 11 is a plan view illustrating a schematic diagram of an electricity storage device according to another modified example.
• 13 is a side view showing a state in which a sheath member is wrapped around an electrode body during the manufacture of an electricity storage device according to another modified example.
• FIG. 32 is an enlarged view of the X portion of FIG. 31 .
• FIG. 11 is a cross-sectional view of an electricity storage device according to a modified example.
• FIG. 11 is a cross-sectional view of an electricity storage device according to a modified example.
• a numerical range indicated by “to” means “greater than or equal to” or “less than or equal to”.
• the notation 2 to 15 mm means 2 mm or more and 15 mm or less.
• the upper limit or lower limit value described in a certain numerical range may be replaced with the upper limit or lower limit value of another numerical range described in stages.
• separately described upper and lower limits, upper and lower limits, or lower and lower limits may each be combined to form a numerical range.
• Fig. 1A is a perspective view that typically shows an electricity storage device 10 according to a first embodiment.
• Fig. 2 is a plan view that typically shows the electricity storage device 10.
• Fig. 3 is a side view that typically shows the electricity storage device 10.
• 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 UDLRFB are common to the subsequent figures.
• the electricity storage device 10 includes an electrode body 200, an exterior body 100, and a plurality (two) of electrode terminals 300.
• the electrode body 200 includes electrodes (positive and negative electrodes) and separators that constitute an electricity storage member such as a lithium ion battery, a capacitor, or an all-solid-state battery.
• the shape of the electrode body 200 is approximately a rectangular parallelepiped. Note that "approximately a rectangular parallelepiped" includes not only a perfect rectangular parallelepiped, but also a solid that can be regarded as a rectangular parallelepiped by, for example, modifying the shape of a portion of the outer surface.
• the electrode terminal 300 is a metal terminal used for inputting and outputting power in the electrode body 200.
• One end of the electrode terminal 300 is electrically connected to an electrode (positive or negative electrode) included in the electrode body 200, and the other end protrudes outward from the edge of the exterior body 100.
• the metal material constituting the electrode terminal 300 is, for example, aluminum, nickel, copper, etc.
• the electrode terminal 300 connected to the positive electrode is usually made of aluminum, etc.
• the electrode terminal 300 connected to the negative electrode is usually made of copper, nickel, etc.
• the exterior body 100 is composed of a film-like exterior member 101 (see FIG. 4, etc.) and seals the electrode body 200.
• the exterior body 100 is formed by wrapping the exterior member 101 around the electrode body 200 and sealing the open portion.
• a storage section for example, there is a method of forming a storage section (recess) in the exterior member 101 through cold forming to accommodate the electrode body 200.
• the exterior member 100 seals the electrode body 200 by wrapping the exterior member 101 around the electrode body 200, so that the electrode body 200 can be easily sealed regardless of the thickness of the electrode body 200.
• the exterior member 101 is wrapped so as to contact the outer surface of the electrode body 200.
• the exterior member 101 is wrapped around the outer surface of the electrode body 200 so that it is in contact with the outer surface of the electrode body 200.
• FIG. 1B is a cross-sectional view showing an example of the layer structure of the exterior member 101.
• the exterior member 101 is, for example, a laminate 101Z (laminate film) having a base layer 101A, a barrier layer 101B, and a heat-sealable resin layer 101C in this order. Note that the exterior member 101 does not need to include all of these layers, and for example, it does not need to include the base layer 101A. Note that it is preferable that the exterior member 101 is heat-sealable.
• the base material layer 101A included in the exterior member 101 is a layer for imparting heat resistance to the exterior member 101 and suppressing the occurrence of pinholes that may occur during processing or distribution.
• the base material layer 101A is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer.
• the base material layer 101A includes at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer, so that the barrier layer 101B is protected during processing of the exterior member 101 and breakage of the exterior member 101 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 base layer 101A may be configured to include both a stretched polyester resin layer and a stretched polyamide resin layer. From the viewpoint of film strength, the thickness of the base layer 101A is preferably, for example, 5 to 300 ⁇ m, and more preferably 20 to 150 ⁇ m.
• the barrier layer 101B included in the exterior member 101 is composed of, for example, a metal foil from the viewpoints of workability such as moisture resistance and ductility, and cost.
• a metal foil from the viewpoints of workability such as moisture resistance and ductility, and cost.
• Specific examples of the metal foil that can be used include aluminum, steel plate, and stainless steel.
• the metal foil preferably contains iron from the viewpoints of packaging suitability and pinhole resistance when packaging the electrode body 200.
• the iron content in the metal foil is preferably 0.5 to 5.0 mass%, and more preferably 0.7 to 2.0 mass%. By having an iron content of 0.5 mass% or more, the exterior member 101 can be provided with packaging suitability, excellent pinhole resistance, and ductility. By having an iron content of 5.0 mass% or less, the exterior member 101 can be provided with excellent flexibility.
• the thickness of the barrier layer 101B is preferably, for example, 15 to 100 ⁇ m, and more preferably 30 to 80 ⁇ m, in terms of barrier properties, pinhole resistance, and packaging suitability.
• the thickness of the barrier layer 101B is 15 ⁇ m or more, the exterior member 101 is less likely to break even when stress is applied during packaging processing.
• the thickness of the barrier layer 101B is 100 ⁇ m or less, the increase in mass of the exterior member 101 can be reduced, and a decrease in the weight energy density of the electricity storage device 10 can be suppressed.
• the barrier layer 101B is a metal foil, it is preferable that at least the surface opposite to the base layer 101A is provided with a corrosion-resistant film in order to prevent dissolution and corrosion.
• the barrier layer 101B 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 101B 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 on the surface of the barrier layer 101B.
• the corrosion-resistant film means a film that improves the acid resistance of the barrier layer 101B (acid-resistant film), a film that improves the alkali resistance of the barrier layer 101B (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.
• 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 also be included in the definition of chemical conversion treatment.
• the barrier layer 101B has a corrosion-resistant coating
• the corrosion-resistant coating is also included in the barrier layer 101B.
• the corrosion-resistant coating prevents delamination between the barrier layer 101B (e.g., aluminum alloy foil) and the base layer 101A during molding of the exterior member 101, and prevents dissolution and corrosion of the surface of the barrier layer 101B due to hydrogen fluoride produced by the reaction of the electrolyte with moisture, particularly when the barrier layer 101B is an aluminum alloy foil, dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 101B.
• the corrosion-resistant coating also improves the adhesion (wettability) of the surface of the barrier layer 101B, and prevents delamination between the base layer 101A and the barrier layer 101B during heat sealing, and between the base layer 101A and the barrier layer 101B during molding of the exterior member 101.
• the heat-sealable resin layer 101C included in the exterior member 101 is a layer that provides the exterior member 101 with heat-sealing sealability.
• the heat-sealable resin layer 101C include resin films made of polyolefin resins or acid-modified polyolefin resins obtained by graft-modifying polyolefin resins with acids such as maleic anhydride. From the standpoint of sealing properties and strength, the thickness of the heat-sealable resin layer 101C is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the heat-sealable resin layer 101C is too hard, when the rolled raw material or the exterior member 101 is bagged into the exterior body 100 by the device, it may slip at the contact point with the device and may not be transported properly. Furthermore, if the exterior member 101 is scratched by the friction, the heat-sealable resin layer 101C will be damaged. Since damage to the heat-sealable resin layer 101C may reduce the heat seal strength, it is preferable that the heat-sealable resin layer has a moderately slippery property. For this reason, when a non-slip or less slippery material is used as the material constituting the heat-sealable resin layer 101C, it is preferable to add a lubricant from the viewpoint of transportability.
• the tensile modulus of the heat-sealable resin layer 101C is in the range of 500 MPa or more and 1000 MPa or less.
• a more preferable range for the tensile modulus of the heat-sealable resin layer 101C is 500 MPa or more and 800 MPa or less, an even more preferable range is 500 MPa or more and 750 MPa or less, an even more preferable range is 500 MPa or more and 700 MPa or less, and an even more preferable range is 510 MPa or more and 700 MPa or less.
• the tensile modulus of the heat-sealable resin layer 101C is 500 MPa or more, which effectively suppresses contamination of the device during molding and transportation of the exterior body 100. That is, the tensile modulus of the heat-sealable resin layer 101C is 500 MPa or more, which makes it difficult for the lubricant located on the surface of the heat-sealable resin layer 101C to be scraped off by the device, etc., and therefore the lubricant located on the surface portion of the heat-sealable resin layer 101C is difficult to transfer to the device, etc., and contamination of the device, etc. is effectively suppressed.
• the tensile modulus of the heat-sealable resin layer 101C is 1000 MPa or less, which provides high sealing strength by heat fusion. That is, the tensile modulus of the heat-sealable resin layer 101C is 1000 MPa or less, which makes it difficult for the heat-sealable resin layer 101C to become brittle, and therefore provides high sealing strength by heat fusion.
• the heat-sealable resin layer 101C becomes brittle and is easily peeled off from the barrier layer 101B laminated via an adhesive layer, resulting in a decrease in seal strength, or the stretching at the folded portion during molding of the exterior body 100 may cause whitening or cracks in the stretched portion, resulting in a decrease in battery performance.
• the tensile modulus of the heat-sealable resin layer 101C exceeds 1000 MPa, the extrudability decreases, which is a factor in decreasing productivity.
• the tensile modulus of the heat-sealable resin layer 101C can be adjusted by adjusting the molecular weight, melt mass flow rate (MFR), etc. of the resin constituting the heat-sealable resin layer 101C.
• the same problems as described above occur during the processing. Since the exterior member 101 is particularly susceptible to damage during processing, solving the above problems is important. By setting the tensile modulus of elasticity of the heat-sealable resin layer 101C in the range of 500 MPa or more and 1000 MPa or less, processing can be performed well.
• the exterior member 101 preferably has one or more layers having a buffer function (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 101C (upper side in FIG. 1B), more preferably outside the barrier layer 101B.
• the buffer layer may be laminated on the outside of the base layer 101A, or the base layer 101A 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 101A or the barrier layer 101B, 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 the 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 the 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 member 101 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.
• a deep storage portion can be formed, which increases the weight of the electrode body 200 and increases the attack on the exterior body 100 due to impacts, etc.
• the puncture strength when pierced from the base layer 101A side of the exterior member 101 measured by a method conforming to the provisions of JIS Z1707:1997, is 30 N or more.
• Preferred ranges of puncture strength include, for example, about 30 to 45 N, about 30 to 40 N, about 35 to 45 N, and about 35 to 40 N.
• the puncture strength of the exterior member 101 is measured as follows.
• the puncture strength from the base layer 101A side of the exterior member 101 is measured by a method conforming to the provisions of JIS Z1707:1997. Specifically, in a measurement environment of 23 ⁇ 2°C and relative humidity (50 ⁇ 5)%, a test piece is fixed with a 115mm diameter stand with a 15mm diameter opening in the center and a pressure plate, and a semicircular needle with a diameter of 1.0mm and a tip radius of 0.5mm is pierced at a speed of 50 ⁇ 5mm per minute, and the maximum stress until the needle penetrates is measured. There are five test pieces, and the average value is calculated. If there are not enough test pieces to measure five, the number that can be measured is measured and the average value is calculated.
• the puncture strength measuring device can be Imada's ZP-500N (force gauge) and MX2-500N (measurement stand).
• the contact angle of the surface of the base material layer 101A side of the exterior member 101 of this embodiment is 80° or less. That is, when the base material layer 101A constitutes the outermost surface of the exterior member 101, the contact angle of the surface of the base material layer 101A is 80° or less.
• the contact angle of the surface of the coating layer is 80° or less.
• the contact angle of the surface of the base layer 101A side of the exterior member 101 is 80° or less, so that the ink is not easily repelled on the surface of the base layer 101A side, the printing characteristics are excellent, and the fixed ink is not easily lost.
• the ink may be repelled by the surface of the base layer 101A side, resulting in printing defects.
• the exterior member 101 of the electricity storage device 10 of this embodiment has a contact angle of 80° or less on the surface of the base layer 101A side, so that the ink is not easily repelled, and the exterior member 101 is particularly suitable as an exterior member 101 on which printing or the like is formed on the surface of the base layer 101A by pad printing.
• the contact angle of the surface on the substrate layer 101A side is 79° or less, and even more preferable that it is 72° or less.
• the contact angle of the surface on the substrate layer 101A side can be determined by measuring the contact angle of the interface between the substrate and the water droplet 5 seconds after the water droplet is applied using an LSE-A210 manufactured by NIC Corporation.
• the contact angle of the surface on the substrate layer 101A side can be suitably set to 80° or less, for example, by subjecting the surface on the substrate layer 101A side to a corona treatment.
• the corona treatment can be performed by irradiating the surface on the substrate layer 101A side with a corona discharge using a commercially available corona surface treatment device.
• the corona treatment conditions are, for example, that the surface on the substrate layer 101A side is treated at an irradiation output of 1 Kw or more and a speed of 10 MT/min, thereby making it possible to reduce the contact angle of the surface on the substrate layer 101A side to 80° or less.
• a corona treatment is performed, followed by a step of printing ink on at least a portion of the surface of the base layer 101A.
• the printing method is not particularly limited, but inkjet printing and pad printing are preferred when printing on the exterior member 101 after molding.
• the contact angle of the surface on the base layer 101A side is set to 80° or less, so that ink can be suitably printed even by pad printing, in which ink is easily repelled by the base layer 101A, which has a lubricant on its surface. Therefore, for example, barcodes, patterns, letters, and other prints can be suitably formed on at least a portion of the surface of the base layer 101A.
• FIG. 4 is a side view showing the state in which the exterior member 101 is wrapped around the electrode body 200 during the manufacturing process of the electricity storage device 10.
• the exterior member 101 is wrapped around the electrode body 200.
• the outermost layer of the electrode body 200 does not necessarily need to be an electrode, and may be, for example, a protective tape or a separator.
• the facing surfaces (thermally adhesive resin layers) of the exterior member 101 are heat sealed to form a first sealing portion 110.
• the first sealing portion 110 may be formed by joining the innermost layer and the outermost layer of the exterior member 101. In this case, it is preferable that the innermost layer and the outermost layer of the exterior member 101 are thermally adhesive resin layers 101C.
• the root portion of the first sealing portion 110 is preferably located on the side 135 of the exterior body 100.
• the side 135 is formed at the boundary between the first surface 130 and the second surface 140, which has a smaller area than the first surface 130.
• the root portion of the first sealing portion 110 can be said to be formed at the boundary between the first surface 130 and the second surface 140, and not to be present on either the first surface 130 or the second surface 140.
• the root portion of the first sealing portion 110 may be located other than the side 135.
• the first sealing portion 110 is bent toward the second surface 140 around the side 135.
• the first sealing portion 110 is in contact with the second surface 140 and covers substantially the entire second surface 140. Note that "substantially the entire second surface 140" means an area that occupies 75% or more of the area of the second surface 140.
• the first sealing portion 110 is not formed on the first surface 130, which has a large area.
• the first surface 130 is flatter than when a sealing portion such as the first sealing portion 110 is in contact with the first surface 130. Therefore, even if another energy storage device 10 is placed on the first surface 130, the other energy storage device 10 does not tilt.
• the first sealing portion 110 is not arranged on the surface (first surface 130) adjacent to the adjacent energy storage device 10.
• such a configuration is preferable from the viewpoint that it is necessary to apply high pressure uniformly from the outer surface of the battery in order to exhibit the battery performance in an all-solid-state battery.
• the root portion of the first sealing portion 110 is on the side 135 of the exterior body 100. Therefore, with the energy storage device 10, a wider bonding area can be secured in the first sealing portion 110 compared to when the root portion of the first sealing portion 110 is on the second surface 140 (for example, the central portion of the second surface 140 in the direction of the arrow UD).
• the bonding area of the first sealing portion 110 does not necessarily have to be the entire area of the first sealing portion 110, and may be only a part of the first sealing portion 110, such as only the vicinity of the root portion of the first sealing portion 110.
• substantially the entire second surface 140 is covered by the first sealing portion 110. That is, in the energy storage device 10, the length of the first sealing portion 110 in the direction of the arrow UD is longer than in the case where the first sealing portion 110 covers only half or less of the area of the second surface 140 (see FIG. 3). Therefore, according to the energy storage device 10, a wide bonding area can be secured in the first sealing portion 110. Furthermore, since substantially the entire second surface 140 is covered by the first sealing portion 110, the energy storage device 10 is stable even if the energy storage device 10 is placed upright so that the second surface 140 is in contact with the mounting surface. That is, the energy storage device 10 is unlikely to tilt with respect to the mounting surface. Therefore, such a configuration is effective, for example, when forming a module by arranging multiple energy storage devices 10 side by side.
• Figure 5 is a view from below showing the state in which the exterior member 101 is wrapped around the electrode body 200 during the manufacture of the energy storage device 10.
• the direction along the edge 135 is the TD (Transverse Direction) of the exterior member 101
• the direction perpendicular to the edge 135 is the MD (Machine Direction) of the exterior member 101.
• the direction along the edge 135 is the direction (TD) perpendicular to the flow direction (MD) of the exterior member 101.
• the first sealing portion 110 is folded along the edge 135, and the direction along the edge 135 is perpendicular to the flow direction of the exterior member 101. Therefore, according to the energy storage device 10, even if a crease is formed in the direction perpendicular to the flow direction of the exterior member 101, the exterior member 101 is unlikely to break, and therefore, the possibility of the first sealing portion 110 breaking due to the first sealing portion 110 being folded can be reduced.
• the machine direction (MD) of the exterior member 101 corresponds to the rolling direction (RD) of the metal foil (aluminum alloy foil, etc.) of the barrier layer contained in the exterior member 101.
• the TD of the exterior member 101 corresponds to the TD of the metal foil.
• the rolling direction (RD) of the metal foil can be determined by the rolling marks.
• the MD of the exterior member 101 can be identified by this method.
• the sea-island structure is confirmed by observing the longitudinal cross section of the heat-sealable resin layer and each cross section (a total of 10 cross sections) at an angle of 10 degrees from the direction parallel to the longitudinal cross section and perpendicular to the longitudinal cross section.
• the island diameter d is measured by the straight-line distance connecting both ends in the direction perpendicular to the thickness direction of the heat-sealable resin layer.
• the average of the diameters d of the top 20 largest islands is calculated for each cross section. The direction parallel to the cross section with the largest average island diameter d is determined to be the MD.
• FIG. 6 is a schematic diagram showing a portion of the cross section taken along the line VI-VI in FIG. 2. As shown in FIG. 6, the second sealing portion 120 is sealed in a state in which the exterior body 100 sandwiches the electrode terminal 300.
• FIG. 7A is a diagram for explaining a method of forming the second sealing portion 120.
• the exterior member 101 is folded, and the opposing surfaces (thermally adhesive resin layers) of the exterior member 101 are heat sealed to form the second sealing portion 120.
• an electrode terminal 300 is located between the opposing surfaces of the exterior member 101.
• a terminal adhesive film 30 (see FIGS. 7B to 7E), which adheres to both metal and resin, may be disposed between the electrode terminal 300 and the exterior member 101.
• the adhesive film may be, for example, a one-layer or two or more-layered resin film made of polyolefin resin or acid-modified polyolefin resin obtained by graft-modifying polyolefin resin with acid such as maleic anhydride.
• the adhesive film is made of two or more layers, it is preferable to place a resin film made of polyolefin resin on the side that is joined to the exterior member 101.
• the adhesive film is made of two or more layers, it is preferable to place a resin film made of acid-modified polyolefin resin obtained by graft-modifying polyolefin resin with acid such as maleic anhydride on the side that is joined to the electrode terminal 300.
• the electrode body 200 includes a plurality of electrodes 210 (positive and negative electrodes).
• Current collectors 215 extending from each electrode 210 are connected to an electrode terminal 300.
• a portion of the electrode terminal 300 that is on the outside of the exterior body 100 is located at a position that is approximately half the thickness of the electricity storage device 10 in the thickness direction of the electricity storage device 10.
• the length L2 is approximately half the length L1. Note that "approximately half the thickness of the electricity storage device 10" means 35% to 65% of the thickness of the electricity storage device 10.
• the difference between the longest and shortest distances between each of the multiple electrodes 210 and the electrode terminal 300 can be made smaller, compared to when, for example, the electrode terminal 300 is located at approximately the same position as the first surface 130 in the thickness direction of the energy storage device 10.
• a barrier layer 101B (made of, for example, metal foil) is provided. By providing the barrier layer 101B, it is possible to prevent moisture from penetrating from the outside of the barrier layer 101B.
• the electrode body 200 is sealed by heat-sealing the heat-sealable resin layer 101C of the exterior member 101, the end face of the heat-sealable resin layer 101C is exposed to the outside, and there is a risk of moisture penetrating from the end face of the heat-sealable resin layer 101C.
• the heat-sealable resin layer 101C of the exterior member 101 absorbs water before the electrode body 200 is sealed with the exterior member 101, there is a risk that the moisture in the heat-sealable resin layer 101C will penetrate into the electrode body 200 after the electrode body 200 is sealed.
• the power storage device 10 is an all-solid-state battery
• gases such as hydrogen sulfide may be generated, depending on the type of solid electrolyte.
• the electricity storage device 10 of this embodiment includes a resin film 20 for electricity storage devices (hereinafter referred to as "film 20") to achieve at least one of suppressing the intrusion of moisture into the electrode body 200 and absorbing gases such as hydrogen sulfide generated from the electrode body 200.
• the film 20 contains at least one of a water absorbing agent and a gas absorbing agent.
• a water absorbing agent may be referred to as a first aspect of the film 20.
• the case where the film 20 contains at least a gas absorbing agent may be referred to as a second aspect of the film 20.
• the location of the film 20 can be selected arbitrarily as long as it is inside the barrier layer 101B of the exterior member 101.
• inside the barrier layer 101B is the opposite side of the base layer 101A with respect to the barrier layer 101B in the direction in which the layers 101A to 101C of the exterior member 101 are stacked.
• the film 20 of the first aspect since the film 20 contains a water absorbing agent, the film 20 absorbs and retains moisture that has infiltrated from the heat-sealable resin layer 101C of the exterior member 101, thereby suppressing the moisture from reaching the electrode body 200.
• the film 20 of the second embodiment inside the barrier layer 101B of the exterior member 101, for example, when the electrode body 200 is an all-solid-state battery, it is possible to absorb gases such as hydrogen sulfide generated by contact between the solid electrolyte layer contained in the elements constituting the all-solid-state battery and moisture.
• the film 20 contains a gas absorbent, so that gases such as hydrogen sulfide generated from the electrode body 200 are absorbed by the film 20. Therefore, it is possible to suppress an excessive increase in the internal pressure of the exterior body 100.
• gases such as hydrogen sulfide generated from the electrode body 200 are absorbed by the film 20. Therefore, it is possible to suppress an excessive increase in the internal pressure of the exterior body 100.
• the film 20 can also be used as the heat-sealable resin layer 101C of the exterior member 101 as shown in FIG. 1B.
• the film 20 can also be used as an adhesive layer between the barrier layer 101B and the heat-sealable resin layer 101C.
• the film 20 can also be used as an adhesive film interposed between the heat-sealable resin layers 101C facing each other at a position where the heat-sealable resin layers 101C of the exterior member 101, such as the first sealing portion 110, are heat-sealed to each other.
• the film 20 When the film 20 is used as an adhesive film, the film 20 may have a function of releasing the gas to the outside by peeling off the portion of the heat-sealable resin layer 101C where the film 20 is interposed when the internal pressure of the exterior member 100 increases due to gas generation from the electrode body 200.
• FIG. 7B is another cross-sectional view taken along line VI-VI in FIG. 2.
• the film 20 is disposed between the exterior member 101 and the electrode body 200 so as to cover substantially the entire upper and lower surfaces of the electrode body 200.
• the film 20 and the inner surface of the exterior member 101 may or may not be bonded.
• FIG. 7C is a cross-sectional view showing yet another example taken along line VI-VI in FIG. 2.
• the film 20 is disposed between the exterior member 101 and the electrode body 200 so as to cover substantially the entire side surface of the electrode body 200.
• the film 20 and the inner surface of the exterior member 101 may or may not be bonded.
• FIG. 7D is a cross-sectional view showing yet another example taken along line VI-VI in FIG. 2.
• the film 20 is disposed between the exterior member 101 and the electrode body 200 so as to cover substantially the entire electrode body 200.
• the film 20 and the inner surface of the exterior member 101 may or may not be bonded.
• FIG. 7E is a cross-sectional view showing yet another example taken along line VI-VI in FIG. 2.
• the power storage device 10 has a terminal adhesive film 30 between the electrode terminal 300 and the exterior member 101, which adheres to both metal and resin.
• the film 20 is used as the terminal adhesive film 30.
• the terminal adhesive film 30 Because the end faces of the terminal adhesive film 30 are exposed to the outside, there is a risk that moisture may penetrate through the end faces of the terminal adhesive film 30. In addition, if the terminal adhesive film 30 absorbs water before being interposed between the electrode terminal 300 and the exterior member 101, there is a risk that the moisture in the terminal adhesive film 30 may penetrate into the electrode body 200 after the terminal adhesive film 30 is interposed between the electrode terminal 300 and the exterior member 101.
• the film 20 of the first embodiment As the terminal adhesive film 30, it is possible to effectively prevent moisture from entering from the end of the terminal adhesive film 30 and moisture contained in the terminal adhesive film 30 from entering the electrode body 200. That is, in the electricity storage device 10 including the film 20 of the first embodiment, since the film 20 contains a water absorbing agent, the film 20 absorbs and holds the moisture that has entered from the terminal adhesive film 30, thereby preventing moisture from reaching the electrode body 200.
• the film 20 of the second embodiment as the terminal adhesive film 30, for example, when the electrode body 200 is an all-solid-state battery, gas such as hydrogen sulfide generated by contact between the solid electrolyte layer contained in the elements that constitute the all-solid-state battery and moisture can be effectively absorbed.
• the film 20 contains a gas absorbent, gas such as hydrogen sulfide generated from the electrode body 200 is absorbed by the film 20. Therefore, gas such as hydrogen sulfide is less likely to be released to the outside.
• the moisture to be absorbed is gaseous and/or liquid moisture.
• the gas absorbing film according to the first aspect of the present embodiment can also absorb sulfur-based gases as necessary.
• sulfur-based gases include hydrogen sulfide, dimethyl sulfide, methyl mercaptan, and sulfur oxides represented by SOx.
• the moisture to be absorbed generates various outgases when absorbed in, for example, a solid electrolyte type lithium ion battery, and the sulfur-based gas is a component of the outgas (for example, generated when the power storage device 10 is an all-solid-state battery using a sulfide-based inorganic solid electrolyte or a lithium secondary battery using lithium sulfur in the positive electrode).
• the film 20 of this embodiment may be composed of a single layer, for example as shown in FIG. 7F, or may be composed of two or more layers, for example as shown in FIG. 7G and FIG. 7H.
• FIG. 7G shows a film 20 composed of a laminate in which a first layer 21 and a second layer 22 are stacked.
• FIG. 7H shows a film 20 composed of a laminate in which a second layer 22, a first layer 21, and a third layer 23 are stacked in this order.
• the film 20 when the film 20 is composed of two or more layers, at least one of the two or more layers may contain a water absorbing agent.
• the layer containing the water absorbing agent may be referred to as a "water absorbing layer”.
• Specific examples of the lamination structure of the film 20 according to the first embodiment include a lamination structure in which the first layer 21 on the exterior member 101 side is a water absorbing layer and the second layer 22 on the electrode body 200 side is a layer that does not contain a water absorbing agent, as shown in FIG. 7G.
• examples of the lamination structure in which the first layer 21 located in the middle is a water absorbing layer, and the second layer 22 on the electrode body 200 side and the third layer 23 on the exterior member 101 side are layers that do not contain a water absorbing agent, as shown in FIG. 7H, include a lamination structure in which at least one of the first layer 21 and the third layer 23 is a water absorbing layer and the second layer 22 is a layer that does not contain a water absorbing agent.
• the film 20 when the film 20 is composed of two or more layers, at least one of the two or more layers may contain a gas absorbent.
• the gas absorbent is, for example, at least one of a sulfur-based gas absorbent, a carbon dioxide absorbent, and an oxygen absorbent.
• the second aspect of the film 20 will be described using an example in which the gas absorbent is a sulfur-based gas absorbent.
• Specific examples of the layered structure of the film 20 relating to the second aspect include, for example, in FIG.
• the first layer 21 located in the middle is a sulfur-based gas absorbing layer
• the second layer 22 on the electrode body 200 side and the third layer 23 on the exterior member 101 side are layers that do not contain a sulfur-based gas absorbent
• the first layer 21 and at least one of the third layer 23 are sulfur-based gas absorbing layers
• the second layer 22 is a layer that does not contain a sulfur-based gas absorbent
• the first layer 21 located in the middle is a layer that does not contain a sulfur-based gas absorbing layer
• the second layer 22 on the electrode body 200 side and the third layer 23 on the exterior member 101 side are layers that contain a sulfur-based gas absorbent
• the first layer 21 and at least one of the third layer 23 are layers that do not contain a sulfur-based gas absorbing layer
• the second layer 22 is a layer that contains a sulfur-based gas absorbent.
• Hydrogen sulfide gas is generated from the electrode body 200, so it is preferable that the second layer 22 located on the electrode body 200 side is a sulfur-based
• the film 20 it is preferable that one or both sides of the film 20 have heat fusion properties.
• the film 20 according to the first embodiment is located in the second sealing portion 120 of the exterior member 101, it is preferable to increase the heat fusion properties of the film 20. Therefore, for example, when the film 20 is composed of three or more layers, it is preferable that the layer located on the surface (the second layer 22 and the third layer 23 in FIG. 7H) contains a heat fusion resin.
• the layer located on the surface does not contain a water absorbing agent (particularly an inorganic water absorbing agent).
• the water absorption layer is provided between the layers located on the surface. This is because if the water absorption layer is located on the surface, it will absorb moisture in the air before the electricity storage device 10 is manufactured, and the water absorption performance of the water absorption layer is likely to decrease.
• the third layer 23 located on the exterior member 101 side is a water absorption layer. This is because the third layer 23 is close to the exterior member 101 and easily absorbs moisture that has infiltrated from the exterior member 101 side.
• the second layer 22 located on the electrode body 200 side is the water absorption layer. This is because the second layer 22 is close to the electrode body 200 and easily absorbs moisture contained in the electrode body 200.
• the film 20 it is also preferable that one or both sides of the film 20 have heat scalability.
• the film 20 according to the second embodiment is located in the second sealing portion 120 of the exterior member 101, it is preferable to increase the heat scalability of the film 20. Therefore, for example, when the film 20 is composed of three or more layers, it is preferable that the layer located on the surface (the second layer 22 and the third layer 23 in FIG. 7H) contains a heat scalable resin. Furthermore, from the viewpoint of suppressing a decrease in the heat scalability of the layer located on the surface, it is preferable that the layer located on the surface does not contain a sulfur-based gas absorbent.
• the film 20 according to the first embodiment may further contain a sulfur-based gas absorbent, which will be described later, in addition to the water absorbing agent.
• the layer containing the sulfur-based gas absorbent may be referred to as a "sulfur-based gas absorbing layer".
• the sulfur-based gas absorbent may be contained in the water absorbing layer, or may be contained in a layer that does not contain a water absorbing agent. If the film 20 is composed of two or more layers, it is preferable that the sulfur-based gas absorbent is contained in a layer that does not contain a water absorbing agent to form a sulfur-based gas absorbing layer.
• the water absorption layer and the sulfur-based gas absorbing layer are separate layers.
• a specific example of the laminated structure of the film 20 is, for example, a laminated structure in which the first layer 21 is a water absorption layer and the second layer 22 is a sulfur-based gas absorption layer in FIG. 7G.
• a laminated structure in which the first layer 21 is a water absorption layer and at least one of the second layer 22 and the third layer 23 is a sulfur-based gas absorption layer; a laminated structure in which at least one of the first layer 21 and the third layer 23 is a water absorption layer and the second layer 22 is a sulfur-based gas absorption layer, etc. are included.
• the second layer 22 located on the electrode body 200 side is a sulfur-based gas absorption layer.
• the water absorption layer is provided between layers located on the surface, and therefore, among these, a laminated structure in which the first layer 21 located between the second layer 22 and the third layer 23 is a water absorption layer and the second layer 22 located on the electrode body 200 side is a sulfur-based gas absorption layer is the most preferable.
• the film 20 according to the second embodiment may further contain a water absorbing agent, which will be described later, in addition to the sulfur-based gas absorbent.
• the layer containing the water absorbing agent may be referred to as a "water absorbing layer".
• the water absorbing agent may be contained in the sulfur-based gas absorbing layer, or may be contained in a layer that does not contain the water absorbing agent. If the film 20 according to the second embodiment is composed of two or more layers, it is preferable that the water absorbing agent is contained in a layer that does not contain the sulfur-based gas absorbent to form the water absorbing layer.
• the water absorption layer and the sulfur-based gas absorbing layer are separate layers.
• a specific example of the laminated structure of the film 20 is, for example, a laminated structure in which the first layer 21 is a sulfur-based gas absorbing layer and the second layer 22 is a water-absorbing layer, as shown in FIG. 7G.
• the water absorption layer is provided between layers located on the surface. This is because if the water absorption layer is located on the surface, it will absorb moisture in the air before the electricity storage device 10 is manufactured, and the water absorption performance of the water absorption layer is likely to decrease.
• the most preferred laminated structure is one in which the first layer 21 located between the second layer 22 and the third layer 23 is a water absorption layer, which will be described later, and the second layer 22 located on the electrode body 200 side is a sulfur-based gas absorption layer.
• the water absorption layer is preferably the third layer 23 located on the exterior member 101 side.
• the water absorption layer is preferably the second layer 22 located on the electrode body 200 side. This is because the second layer 22 is close to the electrode body 200 and easily absorbs moisture contained in the electrode body 200.
• the resin contained in the film 20 is not particularly limited as long as it does not impair the effects of this embodiment.
• it is preferably a thermoplastic resin, and more preferably a heat-sealable resin.
• resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenolic resin, as well as modified versions of these resins.
• the resin forming the film 20 may be a copolymer of these resins or a modified version of the copolymer. It may also be a mixture of these resins.
• heat-sealable resins such as polyester and polyolefin are preferred.
• polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymerized polyesters.
• copolymerized polyesters include copolymerized polyesters in which ethylene terephthalate is the main repeating unit.
• polyesters include copolymerized polyesters in which ethylene terephthalate is the main repeating unit and is polymerized with ethylene isophthalate (hereinafter abbreviated as polyethylene (terephthalate/isophthalate)), polyethylene (terephthalate/adipate), polyethylene (terephthalate/sodium sulfoisophthalate), polyethylene (terephthalate/sodium isophthalate), polyethylene (terephthalate/phenyl-dicarboxylate), and polyethylene (terephthalate/decane dicarboxylate).
• polyethylene (terephthalate/isophthalate) polyethylene (terephthalate/adipate)
• polyethylene (terephthalate/sodium sulfoisophthalate) polyethylene
• Terephthalate/sodium isophthalate polyethylene (terephthalate/phenyl-dicarboxylate)
• polyethylene (terephthalate/decane dicarboxylate) polyethylene (terephthal
• 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. These polyolefin resins may be used alone or in combination of two or more kinds. Among these, polypropylene is particularly preferred because of its excellent heat fusion properties.
• the resin contained in the film 20 preferably contains a resin containing a polyolefin skeleton as a main component, more preferably contains polyolefin as a main component, and even more preferably contains polypropylene as a main component.
• the main component means that the content of the resin components contained in the film 20 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.
• the resin contained in the film 20 containing polypropylene as a main component means that the content of polypropylene among the resin components contained in the film 20 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.
• the resin contained in the film 20 preferably contains polyester as a main component.
• the main component means that the content of the resin components contained in the film 20 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.
• the resin contained in the film 20 containing polyester as a main component means that the content of polyester of the resin components contained in the film 20 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.
• a preformed resin film may be used as the film 20.
• the resin forming the film 20 may be formed into a film by extrusion molding, coating, or the like, to form a resin formed from a resin film.
• the resin contained in the film 20 may contain an elastomer.
• the elastomer plays a role in ensuring the durability of the film 20 in a high-temperature environment while increasing its flexibility.
• Preferred elastomers include at least one thermoplastic elastomer selected from polyesters, polyamides, polyurethanes, polyolefins, polystyrenes, and polyethers, or thermoplastic elastomers that are copolymers of these.
• the content of the elastomer in the film 20 is not particularly limited as long as it can ensure the durability of the film 20 in a high-temperature environment while increasing its flexibility, and is, for example, about 0.1% by mass or more, preferably about 0.5% by mass or more, more preferably about 1.0% by mass or more, and even more preferably about 3.0% by mass or more.
• the content is, for example, about 10.0% by mass or less, about 8.0% by mass or less, about 5.0% by mass or less, etc.
• Preferred ranges of the content include about 0.1 to 10.0% by mass, about 0.1 to 8.0% by mass, about 0.1 to 5.0% by mass, about 0.5 to 10.0% by mass, about 0.5 to 8.0% by mass, about 0.5 to 5.0% by mass, about 1.0 to 10.0% by mass, about 1.0 to 8.0% by mass, about 1.0 to 5.0% by mass, about 3.0 to 10.0% by mass, about 3.0 to 8.0% by mass, and about 3.0 to 5.0% by mass.
• the resin content of the film 20 according to the first embodiment is, for example, 99.9% by mass or more, preferably 99.5% by mass or more, and more preferably 99.0% by mass or more.
• the resin content of the film 20 according to the second embodiment is, for example, 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more.
• the water absorbing agent contained in the film 20 according to the first embodiment is not particularly limited as long as it is dispersed in the resin film and exhibits water absorption.
• an inorganic water absorbing agent can be suitably used.
• preferred inorganic water absorbing agents include calcium oxide, anhydrous magnesium sulfate, magnesium oxide, calcium chloride, zeolite, aluminum oxide, silica gel, alumina gel, and burnt alum.
• inorganic chemical water absorbing agents among inorganic water absorbing agents have a higher water absorbing effect than inorganic physical water absorbing agents, can reduce the content, and are easy to achieve sufficient water absorption and heat fusion in a single layer.
• inorganic chemical water absorbing agents calcium oxide, anhydrous magnesium sulfate, and magnesium oxide are particularly preferred because they release less moisture again, have high stability over time in a low humidity state inside the package, and have an absolute dry effect.
• the absolute dry effect refers to the effect of absorbing water until the relative humidity is near 0%
• the humidity control effect refers to the effect of absorbing water when the humidity is high and releasing moisture when the humidity is low, thereby keeping the humidity constant.
• inorganic chemical absorbents that re-release moisture at a high temperature range are preferred.
• the resin contained in the water absorption layer is exemplified as the same resin as the resin exemplified as the resin contained in the film 20.
• the resin content in the water absorption layer of the film 20 is, for example, 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more.
• the content of the water absorbent contained in the film 20 is not particularly limited as long as the effect of this embodiment is achieved, and is preferably at least about 0.5 parts by mass, more preferably at least about 2 parts by mass, even more preferably at least about 3 parts by mass, and is preferably not more than about 50 parts by mass, more preferably not more than about 45 parts by mass, and even more preferably not more than 40 parts by mass, relative to 100 parts by mass of the resin contained in the film 20.
• Preferred ranges for the content include approximately 0.5 to 50 parts by mass, approximately 0.5 to 45 parts by mass, approximately 0.5 to 40 parts by mass, approximately 2 to 50 parts by mass, approximately 2 to 45 parts by mass, approximately 2 to 40 parts by mass, approximately 3 to 50 parts by mass, approximately 3 to 45 parts by mass, and approximately 3 to 40 parts by mass.
• the content of the water absorbing agent contained in the water absorption layer of the film 20 is not particularly limited as long as the effect of this embodiment is achieved, and is preferably about 0.5 parts by mass or more, more preferably about 2 parts by mass or more, and even more preferably about 3 parts by mass or more, relative to 100 parts by mass of the resin contained in the water absorption layer.
• Preferred ranges of the content include about 0.5 to 50 parts by mass, about 0.5 to 45 parts by mass, about 0.5 to 40 parts by mass, about 2 to 50 parts by mass, about 2 to 45 parts by mass, about 2 to 40 parts by mass, about 3 to 50 parts by mass, about 3 to 45 parts by mass, and about 3 to 40 parts by mass.
• the water absorbing agent contained in the water absorbing layer is preferably contained, for example, via a master batch in which the water absorbing agent and resin are melt blended. Specifically, the water absorbing agent is melt blended at a relatively high concentration with the resin to prepare a master batch. The obtained master batch is further mixed with the resin and formed into a film to form the water absorbing layer.
• the content of the water absorbing agent in the master batch is preferably about 20 to 90 mass %, more preferably about 30 to 70 mass %. Within the above range, it is easy to contain a necessary and sufficient amount of the water absorbing agent in a dispersed state in the water absorbing layer.
• the film 20 according to the first embodiment may further contain a sulfur-based gas absorbent in addition to the water absorbent.
• the sulfur-based gas absorbent preferably contains a sulfur-based gas physical absorbent and/or a sulfur-based gas chemical absorbent.
• various sulfur-based gas absorbents in combination, for example, by using a sulfur-based gas physical absorbent and a sulfur-based gas chemical absorbent in combination, it becomes possible to easily absorb various types of sulfur-based gases.
• the sulfur-based gas absorbent is used, for example, in the form of a powder.
• the maximum particle size of the sulfur-based gas absorbent is preferably 20 ⁇ m or less, and the number average particle size of the powder is preferably 0.1 ⁇ m or more and 15 ⁇ m or less.
• the sulfur-based gas absorbent is likely to aggregate, and if the number average particle size is larger than the above range, the homogeneity of the sulfur-based gas absorbing film may be inferior, and the surface area of the sulfur-based gas absorbent may be reduced, resulting in poor sulfur-based gas absorption.
• the sulfur-based gas physical absorbent is a gas absorbent that has the effect of physically absorbing the sulfur-based gas to be absorbed.
• the sulfur-based gas physical absorbent preferably contains one or more selected from the group consisting of hydrophobic zeolite, bentonite, and sepiolite having a SiO2 / Al2O3 molar ratio of 1/1 to 2000/1.
• Hydrophobic zeolite is a zeolite with excellent absorption of low polarity molecules such as sulfur-based gases, and has a porous structure.
• the higher the molar ratio of SiO 2 /Al 2 O 3 which is a component of zeolite, the higher the hydrophobicity.
• the SiO 2 /Al 2 O 3 molar ratio of hydrophobic zeolite is preferably 30/1 to 10,000/1, more preferably 35/1 to 9,000/1, and even more preferably 40/1 to 8,500/1.
• hydrophobic zeolite has high heat resistance and can maintain its absorption effect even when exposed to high temperatures of 230°C or higher.
• hydrophobic zeolite with a molar ratio in the above range is preferably used from the balance between sulfur-based gas absorption ability and ease of availability.
• Bentonite is an inorganic substance whose main component is the clay mineral montmorillonite, containing a large amount of layered aluminum phyllosilicate, and containing minerals such as quartz and feldspar as impurities.
• clay mineral montmorillonite containing a large amount of layered aluminum phyllosilicate, and containing minerals such as quartz and feldspar as impurities.
• Ca-type bentonite which contains a large amount of Ca2+ ions
• activated bentonite which is artificially converted to Na-type by adding a few wt% of sodium carbonate to Ca-type bentonite.
• Sepiolite is a clay mineral whose main component is hydrated magnesium silicate, and has a porous structure with a general chemical composition of Mg 8 Si 12 O 30 (OH 2 ) 4 (OH) 4.6-8H 2 O.
• the pH (3% suspension) is preferably 8.0-9.0, and more preferably 8.9-9.3.
• the sulfur-based gas chemical absorbent is a gas absorbent that has the function of chemically absorbing or decomposing the sulfur-based gas of the gas to be absorbed. And, because it is chemically absorbed or decomposed, it is not easily affected by water, etc., and once absorbed, the sulfur-based gas molecules are not easily desorbed, so that it can be efficiently absorbed.
• the decomposition product is absorbed by the sulfur-based gas physical absorbent or the sulfur-based gas chemical absorbent.
• the sulfur-based gas chemical absorbent preferably contains one or more selected from the group consisting of inorganic matter carrying a metal oxide, glass mixed with a metal, and glass mixed with a metal ion.
• the metal oxide in the inorganic matter carrying a metal oxide preferably contains one or more selected from the group consisting of CuO, ZnO, and AgO.
• the inorganic matter to be supported is preferably an inorganic porous body such as zeolite.
• the metal in the glass mixed with a metal, or the metal species of the metal ions in the glass mixed with a metal ion preferably includes one or more species selected from the group consisting of Ca, Mg, Na, Cu, Zn, Ag, Pt, Au, Fe, Al, and Ni.
• the content of the sulfur-based gas absorbent in the film 20 is not particularly limited beyond the limit of absorbing sulfur-based gases, and is preferably at least about 0.1 part by mass, more preferably at least about 0.2 parts by mass, and even more preferably at least about 0.3 parts by mass, relative to 100 parts by mass of the resin contained in the film 20, and is preferably not more than about 30 parts by mass, more preferably not more than about 27 parts by mass, and even more preferably not more than 25 parts by mass, and preferred ranges for the content include approximately 0.1 to 30 parts by mass, approximately 0.1 to 27 parts by mass, approximately 0.1 to 25 parts by mass, approximately 0.2 to 30 parts by mass, approximately 0.2 to 27 parts by mass, approximately 0.2 to 25 parts by mass, approximately 0.3 to 30 parts by mass, approximately 0.3 to 27 parts by mass, and approximately 0.3 to 25 parts by mass.
• the content of the sulfur-based gas absorbent contained in the sulfur-based gas absorbing layer of the film 20 is not particularly limited as long as it absorbs sulfur-based gases, and is preferably about 5 parts by mass or more, more preferably about 6 parts by mass or more, and even more preferably about 7 parts by mass or more, relative to 100 parts by mass of the resin contained in the sulfur-based gas absorbing layer. Also, it is preferably about 60 parts by mass or less, more preferably about 55 parts by mass or less, and even more preferably about 50 parts by mass or less, and about 30 parts by mass or less.
• the preferred range of the content is about 5 to 60 parts by mass, about 5 to 55 parts by mass, about 5 to 50 parts by mass, about 5 to 30 parts by mass, about 6 to 60 parts by mass, about 6 to 55 parts by mass, about 6 to 50 parts by mass, about 6 to 30 parts by mass, about 7 to 60 parts by mass, about 7 to 55 parts by mass, about 7 to 50 parts by mass, and about 7 to 30 parts by mass.
• the content of the resin in the sulfur-based gas absorbing layer is, for example, 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more.
• the sulfur-based gas absorbent contained in the sulfur-based gas absorbing layer is preferably contained via a master batch in which the sulfur-based gas absorbent is melt-blended with a resin.
• a master batch by melt-blending the sulfur-based gas absorbent with a resin at a relatively high concentration, and then dry-blend the master batch with other components to achieve a desired concentration in the sulfur-based gas absorbing layer.
• the sulfur-based gas absorbent and resin to be melt-blended may each be one type or two or more types.
• the content of the sulfur-based gas absorbent in the master batch is preferably about 20 to 90 mass%, more preferably about 30 to 70 mass%. Within the above range, it is easy to contain a necessary and sufficient amount of sulfur-based gas absorbent in a dispersed state in the sulfur-based gas absorbing layer.
• the resin contained in the sulfur-based gas absorbing layer is exemplified as the same resin as the resin exemplified as the resin contained in the water absorbing layer.
• the sulfur-based gas absorbent may be contained in the water absorption layer, or may be contained in a layer that does not contain a water absorption agent.
• the sulfur-based gas absorbent is contained in the water absorption layer, the water absorption layer also functions as a sulfur-based gas absorption layer.
• the film 20 according to the first embodiment may contain various plastic compounding agents and additives, for example, for the purpose of improving or modifying processability, heat resistance, weather resistance, mechanical properties, dimensional stability, oxidation resistance, slipperiness, release properties, flame retardancy, mold resistance, electrical properties, strength, etc.
• the content may range from a trace amount to several tens of percent and may be any amount depending on the purpose.
• common additives include antiblocking agents, lubricants, crosslinking agents, antioxidants, UV absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, modifying resins, etc.
• the thickness of the film 20 according to the first embodiment is not particularly limited as long as it provides the effects of the present invention, and is preferably at least about 10 ⁇ m, more preferably at least about 15 ⁇ m, and even more preferably at least about 20 ⁇ m, and is preferably no more than about 1000 ⁇ m, more preferably no more than about 900 ⁇ m, and even more preferably no more than about 500 ⁇ m.
• Preferred ranges for the thickness include about 10 to 1000 ⁇ m, about 10 to 900 ⁇ m, about 10 to 500 ⁇ m, about 15 to 1000 ⁇ m, about 15 to 900 ⁇ m, about 15 to 500 ⁇ m, about 20 to 1000 ⁇ m, about 20 to 900 ⁇ m, and about 20 to 500 ⁇ m.
• the thickness of each layer may be the thickness of the film 20 as described above.
• the thickness of the water-absorbing layer is preferably about 5 ⁇ m or more, more preferably about 6 ⁇ m or more, and even more preferably about 7 ⁇ m or more, and is preferably about 500 ⁇ m or less, more preferably about 400 ⁇ m or less, and even more preferably about 300 ⁇ m or less, and preferred ranges for the thickness include about 5 to 500 ⁇ m, about 5 to 400 ⁇ m, about 5 to 300 ⁇ m, about 6 to 500 ⁇ m, about 6 to 400 ⁇ m, about 6 to 300 ⁇ m, about 7 to 500 ⁇ m, about 7 to 400 ⁇ m, and about 7 to 300 ⁇ m.
• the thickness of the sulfur-based gas absorbing layer is preferably about 5 ⁇ m or more, more preferably about 7 ⁇ m or more, and even more preferably about 10 ⁇ m or more, and is preferably about 500 ⁇ m or less, more preferably about 400 ⁇ m or less, and even more preferably about 300 ⁇ m or less.
• Preferred ranges for the thickness include about 5 to 500 ⁇ m, about 5 to 400 ⁇ m, about 5 to 300 ⁇ m, about 7 to 500 ⁇ m, about 7 to 400 ⁇ m, about 7 to 300 ⁇ m, about 10 to 500 ⁇ m, about 10 to 400 ⁇ m, and about 10 to 300 ⁇ m.
• the sulfur-based gas absorbent preferably contains a sulfur-based gas physical absorbent and/or a sulfur-based gas chemical absorbent.
• a sulfur-based gas physical absorbent for example, by using a sulfur-based gas physical absorbent and a sulfur-based gas chemical absorbent in combination, it becomes possible to easily absorb a variety of sulfur-based gases.
• the sulfur-based gas absorbent is used, for example, in the form of a powder.
• the maximum particle size of the sulfur-based gas absorbent is preferably 20 ⁇ m or less, and the number average particle size of the powder is preferably 0.1 ⁇ m or more, 1.0 ⁇ m or more, and is preferably 15 ⁇ m or less, 10 ⁇ m or less, or 8 ⁇ m or less, and preferred ranges include about 0.1 to 15 ⁇ m, about 0.1 to 10 ⁇ m, about 0.1 to 8 ⁇ m, about 1 to 15 ⁇ m, about 1 to 10 ⁇ m, and about 1 to 8 ⁇ m.
• the sulfur-based gas absorbent will be prone to aggregation, and if the number average particle size is larger than the above range, the homogeneity of the sulfur-based gas absorbing film may be poor, and the surface area of the sulfur-based gas absorbent may be small, resulting in poor sulfur-based gas absorption.
• the sulfur-based gas physical absorbent is a gas absorbent that has the effect of physically absorbing the sulfur-based gas to be absorbed.
• the sulfur-based gas physical absorbent preferably contains one or more selected from the group consisting of hydrophobic zeolite, bentonite, and sepiolite having a SiO2/Al2O3 molar ratio of 1/1 to 2000/1.
• hydrophobic zeolite bentonite, and sepiolite are the same as those described in the first aspect, and will not be described here.
• sulfur gas chemical absorbent The sulfur-based gas chemical absorbent is the same as that described in the first embodiment, and the description thereof will be omitted.
• the resin contained in the sulfur-based gas absorbing layer can be the same as the resin exemplified as the resin contained in film 20.
• the content of the sulfur-based gas absorbent in the film 20 is not particularly limited as long as it absorbs sulfur-based gases, and is preferably at least about 0.1 part by mass, more preferably at least about 0.2 parts by mass, and even more preferably at least about 0.3 parts by mass, relative to 100 parts by mass of the resin contained in the film 20, and is preferably not more than about 30 parts by mass, more preferably not more than about 29 parts by mass, and even more preferably not more than 28 parts by mass, and preferred ranges for the content include approximately 0.1 to 30 parts by mass, approximately 0.1 to 29 parts by mass, approximately 0.1 to 28 parts by mass, approximately 0.2 to 30 parts by mass, approximately 0.2 to 29 parts by mass, approximately 0.2 to 28 parts by mass, approximately 0.3 to 30 parts by mass, approximately 0.3 to 29 parts by mass, and approximately 0.3 to 28 parts by mass.
• the content of the sulfur-based gas absorbent contained in the sulfur-based gas absorbing layer of the film 20 is not particularly limited as long as it absorbs sulfur-based gases, and is preferably about 5 parts by mass or more, more preferably about 6 parts by mass or more, and even more preferably about 7 parts by mass or more, relative to 100 parts by mass of the resin contained in the sulfur-based gas absorbing layer. Also, it is preferably about 60 parts by mass or less, more preferably about 55 parts by mass or less, even more preferably about 50 parts by mass or less, and even more preferably about 30 parts by mass or less.
• the preferred range of the content is about 5 to 60 parts by mass, about 5 to 55 parts by mass, about 5 to 50 parts by mass, about 5 to 30 parts by mass, about 6 to 60 parts by mass, about 6 to 55 parts by mass, about 6 to 50 parts by mass, about 6 to 30 parts by mass, about 7 to 60 parts by mass, about 7 to 55 parts by mass, about 7 to 50 parts by mass, and about 7 to 30 parts by mass.
• the content of the resin in the sulfur-based gas absorbing layer is, for example, 40% by mass or more, preferably 45% by mass or more, and more preferably 50% by mass or more.
• the sulfur-based gas absorbent contained in the sulfur-based gas absorbing layer is preferably contained via a master batch in which the sulfur-based gas absorbent is melt-blended with a resin.
• a master batch by melt-blending the sulfur-based gas absorbent with a resin at a relatively high concentration, and then dry-blend the master batch with other components to achieve a desired concentration in the sulfur-based gas absorbing layer.
• the sulfur-based gas absorbent and resin to be melt-blended may each be one type or two or more types.
• the content of the sulfur-based gas absorbent in the master batch is preferably about 20 to 90 mass%, more preferably about 30 to 70 mass%. Within the above range, it is easy to contain a necessary and sufficient amount of sulfur-based gas absorbent in a dispersed state in the sulfur-based gas absorbing layer.
• the film 20 may further contain a water absorbing agent in addition to the sulfur-based gas absorbent.
• the water absorbing agent contained in the film 20 is not particularly limited as long as it is dispersed in the resin film and exhibits water absorption.
• an inorganic water absorbing agent can be suitably used.
• preferred inorganic water absorbing agents include calcium oxide, anhydrous magnesium sulfate, magnesium oxide, calcium chloride, zeolite, aluminum oxide, silica gel, alumina gel, and burnt alum.
• inorganic chemical water absorbing agents have a higher water absorption effect than inorganic physical water absorbing agents, can reduce the content, and are easy to achieve sufficient water absorption and heat fusion in a single layer.
• inorganic chemical water absorbing agents calcium oxide, anhydrous magnesium sulfate, and magnesium oxide are particularly preferred because they release less moisture again, have high stability over time in a low humidity state inside the package, and have an absolute dry effect.
• the bone-dry effect refers to the effect of absorbing water until the relative humidity is close to 0%
• the humidity control effect refers to the effect of absorbing water when the humidity is high and releasing moisture when the humidity is low, thereby keeping the humidity constant.
• inorganic chemical absorbents with a high temperature range for re-releasing moisture are preferred.
• the content of the water absorbent contained in the film 20 is not particularly limited as long as the effect of this embodiment is achieved, and is preferably at least about 0.5 parts by mass, more preferably at least about 2 parts by mass, even more preferably at least about 3 parts by mass, and is preferably not more than about 50 parts by mass, more preferably not more than about 45 parts by mass, and even more preferably not more than 40 parts by mass, relative to 100 parts by mass of the resin contained in the film 20.
• Preferred ranges for the content include approximately 0.5 to 50 parts by mass, approximately 0.5 to 45 parts by mass, approximately 0.5 to 40 parts by mass, approximately 2 to 50 parts by mass, approximately 2 to 45 parts by mass, approximately 2 to 40 parts by mass, approximately 3 to 50 parts by mass, approximately 3 to 45 parts by mass, and approximately 3 to 40 parts by mass.
• the content of the water absorbing agent contained in the water absorption layer of the film 20 is not particularly limited as long as the effect of this embodiment is achieved, and is preferably about 0.5 parts by mass or more, more preferably about 2 parts by mass or more, and even more preferably about 3 parts by mass or more, relative to 100 parts by mass of the resin contained in the water absorption layer.
• Preferred ranges of the content include about 0.5 to 50 parts by mass, about 0.5 to 45 parts by mass, about 0.5 to 40 parts by mass, about 2 to 50 parts by mass, about 2 to 45 parts by mass, about 2 to 40 parts by mass, about 3 to 50 parts by mass, about 3 to 45 parts by mass, and about 3 to 40 parts by mass.
• the water absorbing agent contained in the water absorbing layer is preferably contained via a master batch in which the water absorbing agent and resin are melt blended, for example.
• the water absorbing agent is melt blended at a relatively high concentration with the resin to prepare a master batch.
• the obtained master batch is further mixed with the resin and formed into a film to form the water absorbing layer.
• the content of the water absorbing agent in the master batch is preferably about 20 to 90 mass %, more preferably about 30 to 70 mass %. Within the above range, it is easy to contain a necessary and sufficient amount of the water absorbing agent in a dispersed state in the water absorbing layer.
• the resin contained in the water-absorbing layer is exemplified as the same resin as the resin exemplified as the resin contained in the film 20.
• the resin content in the water absorption layer of the film 20 is, for example, 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more.
• the water absorbing agent may be contained in the sulfur-based gas absorbing layer, or may be contained in a layer that does not contain the sulfur-based gas absorbing agent.
• the sulfur-based gas absorbing layer also functions as a water absorbing layer.
• the film 20 may contain various plastic compounding agents and additives for the purpose of improving or modifying, for example, processability, heat resistance, weather resistance, mechanical properties, dimensional stability, oxidation resistance, slipperiness, release properties, flame retardancy, mold resistance, electrical properties, strength, etc.
• the content may range from a trace amount to several tens of percent and may be any amount depending on the purpose.
• typical additives may include, for example, antiblocking agents, lubricants, crosslinking agents, antioxidants, UV absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, modifying resins, etc.
• the thickness of the film 20 is not particularly limited as long as it provides the effects of the present invention, and is preferably at least about 25 ⁇ m, more preferably at least about 30 ⁇ m, and even more preferably at least about 40 ⁇ m, and is preferably at most about 250 ⁇ m, more preferably at most about 240 ⁇ m, and even more preferably at most about 230 ⁇ m.
• Preferred ranges for the thickness include about 25 to 250 ⁇ m, about 25 to 240 ⁇ m, about 25 to 230 ⁇ m, about 30 to 250 ⁇ m, about 30 to 240 ⁇ m, about 30 to 230 ⁇ m, about 40 to 250 ⁇ m, about 40 to 240 ⁇ m, and about 40 to 230 ⁇ m.
• the thickness of each layer may be the thickness of the film 20 as described above.
• the thickness of the sulfur-based gas absorbing layer is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more, and even more preferably about 20 ⁇ m or more, and is, for example, about 100 ⁇ m or less, preferably about 95 ⁇ m or less, more preferably about 90 ⁇ m or less, and even more preferably about 85 ⁇ m or less
• preferred ranges of the thickness include about 10 to 100 ⁇ m, about 10 to 95 ⁇ m, about 10 to 90 ⁇ m, about 10 to 85 ⁇ m, about 15 to 100 ⁇ m, about 15 to 95 ⁇ m, about 15 to 90 ⁇ m, about 15 to 85 ⁇ m, about 20 to 100 ⁇ m, about 20 to 95 ⁇ m, about 20 to 90 ⁇ m, and about 20 to 85 ⁇ m.
• the thickness of the water absorption layer is preferably about 5 ⁇ m or more, more preferably about 6 ⁇ m or more, and even more preferably about 7 ⁇ m or more, and is preferably about 60 ⁇ m or less, more preferably about 55 ⁇ m or less, and even more preferably about 50 ⁇ m or less.
• Preferred ranges for the thickness include about 5 to 60 ⁇ m, about 5 to 55 ⁇ m, about 5 to 50 ⁇ m, about 6 to 60 ⁇ m, about 6 to 55 ⁇ m, about 6 to 50 ⁇ m, about 7 to 60 ⁇ m, about 7 to 55 ⁇ m, and about 7 to 50 ⁇ m.
• the manufacturing method of the film 20 is not particularly limited as long as the film 20 can be obtained, and known or commonly used film-forming methods and lamination methods can be applied.
• the film 20 can be manufactured by known film-forming methods and/or lamination methods such as, for example, an extrusion method or a co-extrusion method, a cast molding method, a T-die method, a cutting method, and an inflation method.
• the films constituting each layer prepared in advance may be laminated via an adhesive layer, a molten resin composition may be laminated on a layer prepared in advance by extrusion or co-extrusion, a plurality of layers may be simultaneously prepared and laminated by melt pressure bonding, or one or more resins may be applied and dried to coat another layer.
• the layers constituting the film 20, such as the water-absorbing layer (sulfur-based gas absorbing layer), can be laminated by extrusion or co-extrusion using an extrusion coating method, or can be laminated via an adhesive layer after film formation using an inflation method or casting method. Even in the case of the extrusion coating method, lamination can be performed via an adhesive layer as necessary.
• a film for the water-absorbing layer (or sulfur-based gas absorbing layer) that has been previously formed can be laminated and bonded via an adhesive layer that has been laminated using an extrusion coating method, dry lamination method, non-solvent lamination method, or the like. Then, an aging treatment can be performed as necessary.
• the resin composition forming the water-absorbing layer or the like is first heated and melted, and then expanded and stretched in the required width direction by a T-die to be extruded or co-extruded in a curtain shape, and the molten resin is allowed to flow down onto the surface to be laminated and sandwiched between a rubber roll and a cooled metal roll, thereby simultaneously forming the water-absorbing layer or the like and laminating and bonding it to the surface to be laminated.
• the melt flow rate (MFR) of the resin component contained in each layer is preferably 0.2 to 50 g/10 min, more preferably 0.5 to 30 g/10 min. If the MFR is smaller or larger than the above range, the processability is likely to be inferior.
• the MFR is a value measured by a method conforming to JIS K7210.
• the melt flow rate (MFR) of the resin component contained in each layer is preferably 0.2 to 10 g/10 min, and more preferably 0.2 to 9.5 g/10 min. If the MFR is smaller or larger than the above range, the processability is likely to be inferior.
• the layers constituting the film 20, such as the sulfur-based gas absorbing layer (water absorbing layer), can be laminated by extrusion or co-extrusion using an extrusion coating method, or can be laminated via an adhesive layer after film formation using an inflation method or casting method. Even in the case of the extrusion coating method, lamination can be performed via an adhesive layer as necessary.
• a film for a sulfur-based gas absorbing layer (or water absorbing layer) that has been previously formed can be laminated and bonded via an adhesive layer laminated using an extrusion coating method, dry lamination method, non-solvent lamination method, or the like. Then, an aging treatment can be performed as necessary.
• the resin composition forming the layer such as the sulfur-based gas absorbing layer is first heated and melted, and then expanded and stretched in the required width direction by a T-die to be extruded or co-extruded in a curtain shape, and the molten resin is allowed to flow down onto the surface to be laminated and sandwiched between a rubber roll and a cooled metal roll, thereby simultaneously forming the layer such as the sulfur-based gas absorbing layer and laminating and adhering to the surface to be laminated.
• the melt flow rate (MFR) of the resin component contained in each layer is preferably 0.2 to 50 g/10 min, more preferably 0.5 to 30 g/10 min. If the MFR is smaller or larger than the above range, the processability is likely to be inferior.
• the MFR is a value measured by a method conforming to JIS K7210.
• the melt flow rate (MFR) of the resin component contained in each layer is preferably 0.2 to 10 g/10 min, and more preferably 0.2 to 9.5 g/10 min. If the MFR is smaller or larger than the above range, the processability is likely to be inferior.
• a desired surface treatment can be applied in advance to the surface of each layer as necessary.
• a corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, or other pretreatment can be applied as desired to form a corona treatment layer, an ozone treatment layer, a plasma treatment layer, an oxidation treatment layer, or the like.
• various coating layers such as a primer coating layer, an undercoat coating layer, an anchor coating layer, an adhesive layer, and a vapor deposition anchor coating layer can be formed as desired on the surface to form a surface treatment layer.
• a resin composition containing a polyester resin, a polyamide resin, a polyurethane resin, an epoxy resin, a phenol resin, a (meth)acrylic resin, a polyvinyl acetate resin, a polyolefin resin such as polyethylene or polypropylene, or a copolymer or modified resin thereof, or a cellulose resin, or the like as the main component of the vehicle can be used.
• each layer constituting the film 20 can be further uniaxially or biaxially stretched by a conventionally known method using a tenter method, a tubular method, or the like, as necessary.
• Manufacturing method of electricity storage device> 8 is a flowchart showing a manufacturing procedure of the power storage device 10. The steps shown in FIG.
• the manufacturing device wraps the exterior member 101 around the electrode body 200 (step S100).
• the manufacturing device forms the first sealing portion 110 by heat sealing the mutually facing surfaces (thermally adhesive resin layers) of the exterior member 101 (step S110). This results in the unfinished product shown in Figures 4 and 5.
• the manufacturing equipment folds the first sealing portion 110 so that the first sealing portion 110 contacts the second surface 140 (step S120).
• the manufacturing equipment folds the exterior member 101 with the electrode body 200 stored inside, and forms the second sealing portion 120 by heat sealing the mutually facing surfaces (thermally adhesive resin layers) of the exterior member 101 together (step S130). This completes the energy storage device 10.
• the film 20 contains a water absorbing agent, the film 20 absorbs and retains moisture that has infiltrated from the heat-sealable resin layer 101C of the exterior member 101, thereby preventing the moisture from reaching the electrode body 200.
• the film 20 contains a sulfur-based gas absorbent, hydrogen sulfide generated from the electrode body 200 is absorbed by the film 20. Therefore, it is possible to prevent the internal pressure of the exterior body 100 from increasing excessively.
• the first sealing portion 110 is bent toward the second surface 140, which has a smaller area. That is, the first sealing portion 110 does not exist on the first surface 130, which has a larger area. Therefore, even if another energy storage device 10 is placed on the first surface 130, the other energy storage device 10 will not tilt. As a result, according to the energy storage device 10, when multiple energy storage devices 10 are stacked, unevenness in the distribution of pressure applied to the lower energy storage device 10 can be suppressed. In addition, when used in an all-solid-state battery, it is necessary to apply high pressure uniformly from the outer surface of the battery to exhibit battery performance, so the packaging form of the present invention is preferable.
• the root portion of the first sealing portion 110 is on the side 135 of the exterior body 100. Therefore, according to the energy storage device 10, when the first sealing portion 110 is fitted onto the second surface 140, a wider bonding width can be ensured in the first sealing portion 110 compared to when the base portion of the first sealing portion 110 is on the second surface 140.
• the second sealed portion 120 is formed by folding the exterior member 101 and heat-sealing the mutually facing surfaces of the exterior member 101.
• the shape and the method of forming the second sealed portion 120 are not limited thereto. Note that, in the following, the description will be centered on the parts that are different from the first embodiment, and the description of the parts that are common to the first embodiment will be omitted.
• Fig. 9 is a plan view diagrammatically illustrating an electricity storage device 10X according to the second embodiment
• Fig. 10 is a side view diagrammatically illustrating an electricity storage device 10X
• Fig. 11 is a perspective view diagrammatically illustrating a lid body 400.
• the exterior body 100X is constructed by fitting the lid body 400 into each of the openings at both ends of the exterior member 101 wrapped around the electrode body 200. With the lid body 400 fitted, the exterior member 101 and the lid body 400 are heat sealed together to form the second sealing portion 120X.
• the lid body 400 is a bottomed tray-like member having a rectangular shape in a plan view, and is formed by, for example, cold forming the exterior member 101.
• the lid body 400 does not necessarily have to be made of the exterior member 101, and may be a metal molded product or a resin molded product. That is, the material constituting the lid body 400 may contain at least one of a resin material and a metal material.
• the lid body 400 may have a main body portion containing a metal material and a covering body containing a resin material that covers a part of the main body portion.
• the covering body may be a frame-shaped object of a resin molded product, or may be an adhesive film that is suitably bonded to both a metal material and a resin material.
• the main body portion is bonded to the exterior member 101 via the covering body.
• the lid body 400 is arranged so that the bottom side of the lid body 400 is located inside the exterior body 100X.
• the bottom side of the lid body 400 does not necessarily have to be located inside the exterior body 100X.
• the bottom side of the lid body 400 may be located outside the exterior body 100X.
• the material constituting the lid body 400 has a certain degree of thickness so that the exterior body 100X is prevented from deforming even when the power storage device 10X is arranged in a stacked manner.
• the minimum value of the thickness of the material constituting the lid body 400 is, for example, 1.0 mm, more preferably 3 mm, and even more preferably 4 mm.
• the maximum value of the thickness of the material constituting the lid body 400 is, for example, 10 mm, more preferably 8.0 mm, and even more preferably 7.0 mm.
• the maximum value of the thickness of the material constituting the lid body 400 may be 10 mm or more.
• the preferred ranges of the thickness of the material constituting the lid body 400 are 1.0 mm to 10 mm, 1.0 mm to 8.0 mm, 1.0 mm to 7.0 mm, 3.0 mm to 10 mm, 3.0 mm to 8.0 mm, 3.0 mm to 7.0 mm, 4.0 mm to 10 mm, 4.0 mm to 8.0 mm, and 4.0 mm to 7.0 mm.
• a film is not included as a material constituting the lid body 400.
• the film is, for example, a film defined by the [packaging terminology] standard of the JIS (Japanese Industrial Standards).
• the film defined by the [packaging terminology] standard of the JIS is a plastic film having a thickness of less than 250 ⁇ m.
• the thickness of the material constituting the lid body 400 may vary depending on the part of the lid body 400. If the thickness of the material that constitutes the lid body 400 varies depending on the part of the lid body 400, the thickness of the material that constitutes the lid body 400 is the thickness of the thickest part.
• the electrode terminal 300 passes between the lid body 400 and the exterior member 101 and protrudes to the outside of the exterior body 100X. That is, the lid body 400 and the exterior member 101 are heat sealed with the electrode terminal 300 sandwiched between them.
• the position from which the electrode terminal 300 protrudes to the outside does not necessarily have to be between the lid body 400 and the exterior member 101.
• the electrode terminal 300 may protrude to the outside from a hole formed on any one of the six faces of the exterior body 100X. In this case, the small gap between the exterior body 100X and the electrode terminal 300 is filled with, for example, resin.
• the lid body 400 and the electrode terminal 300 are provided as separate bodies.
• the lid body 400 and the electrode terminal 300 do not necessarily have to be provided as separate bodies.
• the lid body 400 and the electrode terminal 300 may be formed integrally.
• FIG. 12 is a diagram showing a first example in which the lid 400 and the electrode terminal 300 are integrally formed.
• the electrode terminal 300 is heat-sealed in advance to the side of the lid 400.
• an adhesive film that adheres to both the metal and the resin described in the first embodiment may be placed between the lid 400 and the electrode terminal 300.
• the adhesive film is made of two or more layers, it is preferable to place a resin film made of a polyolefin resin on the side that is joined to the lid 400.
• the adhesive film is made of two or more layers, it is preferable to place a resin film made of an acid-modified polyolefin resin in which a polyolefin resin is graft-modified with an acid such as maleic anhydride on the side that is joined to the electrode terminal 300.
• FIG. 13 is a diagram showing a second example in which the lid 400 and the electrode terminal 300 are integrally formed. As shown in FIG. 13, in the second example, the electrode terminal 300 passes through a hole formed in the bottom surface of the lid 400. The small gap in the hole in the bottom surface of the lid 400 is filled with, for example, resin.
• a gas valve may be attached to a hole formed in the second sealing portion 120X or any one of the six faces of the exterior body 100X.
• the gas valve is configured, for example, as a check valve or a breaker valve, and is configured to reduce the pressure inside the exterior body 100X when the pressure increases due to gas generated inside the energy storage device 10X.
• Fig. 14 is a flowchart showing a manufacturing procedure of the power storage device 10X. The steps shown in Fig. 14 are performed by, for example, a manufacturing apparatus for the power storage device 10X.
• the manufacturing device wraps the exterior member 101 around the electrode body 200 (step S200).
• the manufacturing device forms the first sealing portion 110 by heat sealing the mutually facing surfaces (thermally adhesive resin layers) of the exterior member 101 (step S210). This results in the unfinished product shown in Figures 4 and 5.
• the manufacturing equipment bends the first sealing portion 110 so that the first sealing portion 110 contacts the second surface 140 (step S220).
• the manufacturing equipment stores the electrode body 200 in the unfinished product produced in step S220 and attaches a lid body 400 to each of the openings at both ends (step S230).
• the manufacturing equipment forms the second sealing portion 120X by heat sealing the exterior member 101 and the lid body 400 (step S240). This completes the electricity storage device 10X.
• the first sealing portion 110 is also bent toward the second surface 140 having a smaller area. Therefore, according to the power storage device 10X, when a plurality of power storage devices 10X are stacked, it is possible to suppress unevenness in the distribution of pressure applied to the lower power storage device 10X.
• the first sealing portion 110 does not necessarily have to be bent towards the second surface 140 having a smaller area.
• the first sealing portion 110 may be bent towards the first surface 130 having a larger area.
• the root portion of the first sealing portion 110 does not necessarily have to be on the side 135 of the exterior body 100X.
• the root portion of the first sealing portion 110 may be located on a surface of the exterior body 100X other than the lid body 400, for example.
• the power storage device 10X according to the second embodiment includes, for example, the following features.
• the energy storage device 10X comprises an electrode body (electrode body 200) and an exterior body (exterior body 100X) that seals the electrode body (electrode body 200).
• the exterior body (exterior body 100X) is wrapped around the electrode body (electrode body 200) and comprises an exterior member (exterior member 101) with openings formed at both ends, and a lid body (lid body 400) that seals the openings.
• the second sealed portion 120X is not formed by heat sealing the mutually facing surfaces of the exterior member 101 as in the first embodiment (see FIG. 7).
• the opening of the exterior member 101 wrapped around the electrode body 200 is sealed by the lid body 400. That is, the second sealed portion 120X is formed in the portion where the lid body 400 and the exterior member 101 overlap (see FIGS. 9 and 10). With this configuration, the area of the second sealed portion 120X can be easily narrowed by adjusting the depth L3 (FIG. 11) of the lid body 400.
• the energy storage device 10X at a position of the exterior member 101 that covers the corner C1 (FIGS. 9 and 10) of the electrode body 200, no excessive load is generated due to the corner C1 piercing the exterior member 101. This is because, as described above, in the energy storage device 10X, the second sealed portion 120X is not formed by heat sealing the mutually facing surfaces of the exterior member 101 as in the first embodiment.
• the manufacturing procedure of the power storage device 10X is not limited to the procedure shown in the flowchart of FIG. 14.
• the power storage device 10X may be manufactured according to the procedure shown in the flowchart of FIG. 15.
• FIG. 15 is a flow chart showing another manufacturing procedure of the power storage device 10X according to the second embodiment.
• the process shown in FIG. 15 is performed, for example, by a manufacturing apparatus for the power storage device 10X.
• the manufacturing apparatus attaches a member (for example, the member shown in FIGS. 12 and 13) in which the electrode terminal 300 and the lid body 400 are integrated to the electrode body 200 (step S250).
• the electrode terminal 300 is welded to the electrode body 200.
• the manufacturing apparatus then wraps the exterior member 101 around the electrode body 200 (step S260).
• the manufacturing apparatus forms the first sealing portion 110 by heat-sealing the mutually facing surfaces (thermally adhesive resin layers) of the exterior member 101, and forms the second sealing portion 120X by heat-sealing the exterior member 101 and the lid body 400 (step S270). This completes the power storage device 10X.
• the power storage device 10X may be manufactured by such a procedure.
• a temporary sealed electric storage device is generally subjected to a process of aging in a predetermined temperature environment for a predetermined time for the purpose of permeating an electrolyte into the electrode body (hereinafter referred to as an aging process).
• gas is generated from the electrode body 200, and it is necessary to discharge the gas to the outside of the battery.
• a mechanism for releasing the gas generated in the aging process in the final stage of the manufacture of the electric storage device 10X is not provided.
• a mechanism for releasing the gas generated from the electrode body 200 in the final stage of the manufacture of the electric storage device 10Y is provided.
• Configuration of the power storage device Fig. 16 is a side view showing a state in which the exterior member 101Y is wrapped around the electrode body 200 during the manufacture of the power storage device 10Y.
• Fig. 17 is a bottom view showing a state in which the exterior member 101Y is wrapped around the electrode body 200 and a lid body 400 is attached to the exterior member 101Y during the manufacture of the power storage device 10Y.
• the piece 150 is formed when the exterior member 101Y is wrapped around the electrode body 200.
• the piece 150 is formed by joining the opposing surfaces of the exterior member 101Y when the exterior member 101Y is wrapped around the electrode body 200. More specifically, the piece 150 is formed by joining (heat sealing) the peripheries of the opposing surfaces when the exterior member 101Y is wrapped around the electrode body 200. That is, a first sealing portion 154 is formed on the periphery of the piece 150.
• a space 152 is formed where the opposing surfaces of the exterior member 101Y are not joined.
• joint regions 151 where the opposing surfaces of the exterior member 101Y are joined and unjoined regions 153 where the opposing surfaces of the exterior member 101Y are not joined are arranged alternately. That is, in the piece 150, a pattern of joint regions 151 is formed along the side 135.
• the gas generated from the electrode body 200 is discharged to the outside of the exterior body 100Y by, for example, cutting off a portion of the piece 150 to release the sealed state of the exterior body 100Y.
• the gas discharged to the outside of the exterior body 100Y here is not necessarily limited to the gas generated from the electrode body 200, but may be a gas other than the gas generated from the electrode body 200, such as air, water vapor, or hydrogen sulfide.
• the portion including the vicinity of side 135 is heat-sealed in a band shape, thereby sealing the exterior body 100Y again.
• near side 135 areas where the bonding strength between the opposing surfaces of the exterior member 101Y is strong and areas where the bonding strength between the surfaces is weak are alternately arranged along side 135.
• thin and thick portions are alternately arranged along side 135. This is because, by heat-sealing the vicinity of side 135 again, the unbonded area 153 is single-sealed, but the bonded area 151 is double-sealed.
• Fig. 18 is a flowchart showing a manufacturing procedure of the power storage device 10Y. The steps shown in Fig. 18 are performed by, for example, a manufacturing apparatus for the power storage device 10Y.
• the manufacturing equipment wraps the exterior member 101Y around the electrode body 200 (step S300).
• the manufacturing equipment forms the first sealing portion 154 by heat-sealing the peripheral edges of the opposing surfaces (thermally adhesive resin layers) of the exterior member 101Y (step S310).
• the manufacturing equipment forms a pattern of the bonding region 151 by heat-sealing the opposing surfaces of the exterior member 101Y near the side 135 (step S320).
• the manufacturing equipment attaches the lid body 400 to each of the openings at both ends with the electrode body 200 housed in the unfinished product produced in step S320 (step S330).
• the manufacturing equipment forms the second sealed portion 120X by heat sealing the exterior member 101Y and the lid body 400 (step S340). Then, an aging process is performed.
• the manufacturing equipment removes gas generated during the aging process by, for example, cutting off piece 150 (step S350).
• the manufacturing equipment reseals exterior body 100Y by heat-sealing the portion of piece 150 including bonding region 151 into a strip shape and removing the edge portion (step S360). Thereafter, piece 150 is folded toward second surface 140 to complete energy storage device 10Y.
• the piece 150 including the first sealing portion 154 is also folded toward the second surface 140 having a smaller area. Therefore, according to the power storage device 10Y, when a plurality of power storage devices 10Y are stacked, unevenness in the distribution of pressure applied to the lower power storage device 10Y can be suppressed. When used in an all-solid-state battery, it is necessary to apply high pressure uniformly from the outer surface of the battery to exhibit battery performance, and therefore the packaging form of the present invention is preferable.
• the position at which the electrode terminal 300 protrudes to the outside is between the lid body 400 and the exterior member 101.
• the position at which the electrode terminal 300 protrudes to the outside is not limited thereto. Note that, in the following, the description will be centered on the parts that are different from the second embodiment, and the description of the parts that are common to the second embodiment will be omitted.
• FIG. 19 is a plan view that shows a schematic diagram of an electric storage device 10XA according to a fourth embodiment.
• FIG. 20 is a side view that shows a schematic diagram of an electric storage device 10XA.
• the exterior body 100X of the electric storage device 10XA includes a pair of long sides 100XA and a pair of short sides 100XB in a plan view.
• the exterior body 100X is configured by fitting the lid body 400 into each of the openings along the long sides 100XA of the exterior member 101 wrapped around the electrode body 200. With the lid body 400 fitted in, the exterior member 101 and the lid body 400 are heat-sealed to form a second sealing portion 120X.
• a through hole (not shown) is formed in the lid body 400.
• the two electrode terminals 300 protrude from the through holes of the lid body 400 to the outside of the exterior body 100X.
• the two electrode terminals 300 are shaped along the long sides 100XA of the exterior body 100X.
• a small gap between the through hole and the electrode terminal 300 is filled with, for example, resin.
• the first sealing portion 110 is formed on one of the pair of short sides 100XB.
• the position from which the electrode terminal 300 of the lid body 400 protrudes in the thickness direction (arrow UD direction) of the power storage device 10XA can be selected arbitrarily.
• the electrode terminal 300 protrudes from approximately the center of the lid body 400 to the outside of the exterior body 100X in the thickness direction of the power storage device 10XA.
• the length of the electrode terminal 300 in the depth direction (arrow FB direction) of the power storage device 10XA can be selected arbitrarily.
• the length of the electrode terminal 300 in the depth direction (arrow FB direction) of the power storage device 10XA is substantially the same as the length of the electrode body 200.
• the electrode terminals 300 are arranged along the long side 100XA that is longer in the depth direction, so that larger electrode terminals 300 can be used. This makes it possible to provide a high-output power storage device 10XA.
• the above-mentioned embodiments are examples of forms that the power storage device according to the present invention can take, and are not intended to limit the forms.
• the power storage device according to the present invention can take forms different from those exemplified in the above-mentioned embodiments.
• One example of such a form is a form in which a part of the configuration of each of the above-mentioned embodiments is replaced, changed, or omitted, or a form in which a new configuration is added to each of the above-mentioned embodiments.
• Some examples of modified examples of each of the above-mentioned embodiments are shown below.
• the above-mentioned embodiments can also be combined within a range that does not cause technical contradiction.
• one exterior member is wound around the electrode body 200.
• one exterior member is wound around the electrode body 200.
• two or more exterior members may be wound around the electrode body 200.
• FIG. 21 is a side view showing the state in which the exterior members 101Z1 and 101Z2 are wrapped around the electrode body 200 during the manufacturing process of the electric storage device in the modified example.
• the electrode body 200 is covered with the exterior members 101Z1 and 101Z2.
• the first sealing portion 110Z is formed by joining the opposing surfaces of the exterior members 101Z1 and 101Z2.
• each first sealing portion 110Z is folded toward the second surface 140Z side, not toward the first surface 130Z side. Even with this configuration, it is possible to achieve the effect of suppressing unevenness in the distribution of pressure applied to the lower electric storage device when multiple electric storage devices are stacked.
• each first sealing portion 110Z does not necessarily need to be folded.
• each sealing portion 110Z may be sealed while sandwiching a portion of the electrode terminal 300.
• each first sealing portion 110Z does not need to be formed on the side 135Z, and may protrude outward from approximately the center of the second surface 140Z in the thickness direction of the power storage device.
• the electrode body 200 is a so-called stack type configured by stacking a plurality of electrodes 210, but the form of the electrode body 200 is not limited to this.
• the electrode body 200 may be, for example, a so-called wound type configured by winding a positive electrode and a negative electrode via a separator.
• the electrode body 200 may also be configured by stacking a plurality of so-called wound type electrode bodies.
• the second surface 140 is a plane extending downward at a substantially right angle from the first surface 130.
• the form of the second surface 140 is not limited to this.
• the electrode body 200 is a wound electrode body with a plane and a curved surface formed on the outer periphery.
• the area of the plane is larger than the area of the curved surface
• the first surface 130 covers the plane of the electrode body
• the second surface 140 covers the curved surface of the electrode body.
• the second surface 140 may be configured as a curved surface.
• the boundary portion where the second surface 140 extends downward from the first surface 130 is the side 135.
• the bonding regions 151 are formed in four locations.
• the number of locations where the bonding regions 151 are formed is not limited to this.
• the bonding regions 151 may be formed in two locations near both ends along the side 135, in one location near the center of the side 135, or in five or more locations.
• the electrode terminal 300 is disposed in the second sealing portion 120X, but the position at which the electrode terminal 300 is disposed in the exterior body 100X is not limited thereto.
• the electrode terminal 300 can also be disposed in the first sealing portion 110.
• the first sealing portion 110 is sealed in a state in which the electrode terminal 300 is sandwiched between them.
• at least one of the two electrode terminals 300 may be folded toward the second surface 140, may be folded toward the opposite side to the second surface 140, or may not be folded so as to protrude outward from the side 135.
• the electrode terminal 300 and the first sealing portion 110 can be easily sealed, so that the sealing property of the exterior body 100X is improved.
• the electrode body 200 can be easily accommodated in the exterior body 100X.
• the lid body 400 is fitted into each of the openings at both ends of the exterior member 101X as in the second embodiment. With the lid 400 fitted in place, the exterior member 101X and the lid 400 are heat sealed to form the second sealed portion 120.
• the electrode terminal 300 may be disposed in the first sealed portion 110.
• FIG. 23 is a perspective view showing a lid 500 which is a modified example of the lid 400.
• the lid 500 is, for example, plate-shaped and includes a first surface 500A facing the electrode body 200 (see FIG. 9) and a second surface 500B opposite to the first surface 500A.
• a hole 500C penetrating the first surface 500A and the second surface 500B is formed in the center of the lid 500.
• the material constituting the lid 500 includes, for example, a resin material.
• the lid 500 may be configured to include a metal material. That is, the material constituting the lid 500 may include at least one of a resin material and a metal material.
• the lid 500 may have a main body portion including a metal material and a covering body including a resin material that covers a part of the main body portion.
• the covering body may be a frame-shaped object of a resin molded product, or may be an adhesive film that is suitably bonded to both a metal material and a resin material.
• the main body is preferably joined to the exterior member 101 via a covering body.
• a terminal adhesive film 530 that adheres to both the electrode terminal 300 and the lid body 500 is preferably attached to a predetermined range including a portion of the electrode terminal 300 that is joined to the lid body 500.
• the specifications of the terminal adhesive film 530 are the same as those of the terminal adhesive film 30 described in the first embodiment.
• the manufacturing method of the electricity storage device 10X may include a step of electrically connecting the electrode body 200 and the electrode terminal 300, a step of manufacturing the lid body 500, and a step of inserting the electrode terminal 300 connected to the electrode body 200 into the hole 500C of the lid body 500 (see FIG. 24, hereinafter referred to as the "insertion step").
• the lid body 500 When the lid body 500 is plate-shaped, it is preferable that the lid body 500 has a certain degree of thickness so that deformation of the exterior body 100X is suppressed even when the power storage device 10X is arranged on top of each other. From another perspective, when the lid body 500 is plate-shaped, it is preferable that the side of the lid body 500 has a certain degree of thickness so that the side of the lid body 500 and the exterior member 101X can be suitably heat-sealed when forming the second sealing portion 120X.
• the minimum value of the thickness of the lid body 500 is, for example, 1.0 mm, more preferably 3 mm, and even more preferably 4 mm.
• the maximum value of the thickness of the lid body 500 is, for example, 10 mm, more preferably 8.0 mm, and even more preferably 7.0 mm.
• the maximum value of the thickness of the lid body 500 may be 10 mm or more.
• the preferred ranges for the thickness of the material constituting the lid body 500 are 1.0 mm to 10 mm, 1.0 mm to 8.0 mm, 1.0 mm to 7.0 mm, 3.0 mm to 10 mm, 3.0 mm to 8.0 mm, 3.0 mm to 7.0 mm, 4.0 mm to 10 mm, 4.0 mm to 8.0 mm, and 4.0 mm to 7.0 mm.
• the material constituting the lid body 500 does not include films defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the thickness of the lid body 500 may vary depending on the part of the lid body 500. When the thickness of the lid body 500 varies depending on the part, the thickness of the lid body 500 is the thickness of the thickest part.
• the lid 500 may be constructed from a member divided into a first portion 510 and a second portion 520, and may be manufactured by joining the first portion 510 and the second portion 520 so as to sandwich the electrode terminal 300 and the terminal adhesive film 530.
• this gap if a gap occurs between the terminal adhesive film 530 and the hole 530C, it is preferable that this gap be filled, for example, with a resin material such as hot melt or by resin welding.
• the relationship between the width LA of the electrode terminal 300 and the width LB of the lid 500 can be selected arbitrarily.
• the ratio RA of the width LA to the width LB is 50% or more.
• the width LA and the width LB are substantially equal, in other words, the ratio RA is 100%.
• the ratio RA is 50% or more, the area of the electrode terminal 300 that is joined to the lid 500 is large, so that the electrode terminal 300 and the lid 500 can be more firmly joined by heating the electrode terminal 300.
• the width LC of the terminal adhesive film 530 is substantially equal to the width LA of the electrode terminal 300.
• the lid body 500 may be manufactured by insert molding the lid body 500 onto the electrode terminal 300 to which the terminal adhesive film 530 is attached.
• the manufacturing method of the electricity storage device 10X includes a step of electrically connecting the electrode body 200 and the electrode terminal 300, and a step of insert molding the lid body 500 onto the electrode terminal 300 connected to the electrode body 200 (hereinafter referred to as the "insert molding step").
• the exterior member 101 is wrapped around the electrode body 200 and the lid body 500.
• the exterior body 100X may be formed by joining the exterior member 101 and the second surface 500B of the lid body 500 with the lid body 500 fitted therein, to form the second sealing portion 120X.
• the joining means between the exterior member 101 and the second surface 500B of the lid body 500 is, for example, heat sealing.
• the exterior member 101 is joined to a wider area of the lid body 500, thereby improving the sealing property of the exterior body 100X.
• the lid body may be formed by folding the terminal adhesive film 530, and the second sealing portion 120X may be formed by joining any part of the terminal adhesive film 530 to the exterior member 101X.
• a barrier layer is laminated on at least a part of the surface of the lid body 500.
• a barrier layer may be formed on any layer.
• the material that constitutes the barrier layer is, for example, aluminum, steel plate, or stainless steel.
• FIG. 27 is a front view of a cover 600 of another modified example of the cover 400 in the second embodiment.
• the cover 600 includes a metal portion 610, which is a portion where metal is exposed on the surface, and the metal portion 610 and the electrode 210 of the electrode body 200 are welded.
• the cover 600 may be entirely composed of the metal portion 610, or the metal portion 610 may be partially formed.
• the cover 600 is composed of a material having a multilayer structure including a metal layer.
• the metal portion 610 is a portion where layers other than the metal layer are partially removed so that the metal layer is exposed.
• the metal portion 610 of the cover 600 functions as an electrode terminal, so that a space between the cover 600 and the electrode 210 is not required. This allows the power storage device 10X (see FIG. 9) to be configured in a small size.
• FIG. 28 is a front view of a lid body 700 which is another modified example of the lid body 400 in the second embodiment.
• the lid body 700 includes a metal portion 710 made of a metal material, and a non-metal portion 720 connected to the metal portion 710 and made of a resin material.
• the metal portion 710 is welded to the electrode 210 of the electrode body 200.
• the metal portion 710 of the lid body 700 functions as an electrode terminal, so that no space is required between the lid body 700 and the electrode 210. This allows the power storage device 10X (see FIG. 9) to be configured in a small size.
• the electric storage device 10X of the second embodiment or the modified example of the second embodiment may include the film 20 shown in the first embodiment.
• the location where the film 20 is arranged can be arbitrarily selected as long as it is inside the barrier layer 101B (see FIG. 2) of the exterior member 101.
• the film 20 since the film 20 contains a water absorbing agent, the film 20 absorbs and holds the moisture that has infiltrated from the heat-sealable resin layer 101C of the exterior member 101, thereby suppressing the moisture from reaching the electrode body 200. Furthermore, by disposing the film 20 of the second aspect on the inside of the barrier layer 101B of the exterior member 101, for example, when the electrode body 200 is an all-solid-state battery, it is possible to absorb gases such as hydrogen sulfide generated by contact between a solid electrolyte layer contained in an element constituting the all-solid-state battery and moisture. That is, in the electricity storage device 10X including the film 20 of the second aspect, the film 20 contains a gas absorbent, and therefore gases such as hydrogen sulfide generated from the electrode body 200 are absorbed by the film 20.
• FIG. 29A is a cross-sectional view showing a modified example of the electricity storage device 10X of the second embodiment.
• the film 20 is disposed between the exterior member 101 and the electrode body 200 so as to cover substantially the entire upper and lower surfaces of the electrode body 200.
• the film 20 and the inner surface of the exterior member 101 may or may not be bonded. At least a portion of the film 20 may be disposed between the exterior member 101 and the lid body 500.
• 29B is a cross-sectional view showing another modified example of the power storage device 10X of the second embodiment.
• the film 20 is disposed between the lid 500 and the electrode body 200 so as to cover substantially the entire side surface of the electrode body 200.
• the film 20 and the first surface 500A of the lid 500 may or may not be bonded.
• the film 20 and the first surface 500A of the lid 500 may be in contact with each other or may be spaced apart.
• the film 20 may be disposed between the exterior member 101 and the electrode body 200 so as to cover substantially the entire electrode body 200.
• the film 20 and the inner surface (thermally adhesive resin layer 101C) of the exterior member 101 may or may not be bonded.
• 29C is a cross-sectional view showing another modified example of the electric storage device 10X of the second embodiment.
• the electric storage device 10X has a terminal adhesive film 530 that adheres to both metal and resin between the electrode terminal 300 and the lid body 500.
• the film 20 is used as the terminal adhesive film 530.
• the film 20 is preferably disposed at least in the hole 500C of the lid body 500.
• the film 20 may be exposed from the hole 500C of the lid body 500.
• the electric storage device 10X including the lid body 500 may allow moisture to enter through the hole 500C of the lid body 500.
• the film 20 contains a water absorbing agent, and therefore the film 20 absorbs and retains moisture that has entered through the hole 500C of the lid body 500, thereby preventing moisture from reaching the electrode body 200.
• the film 20 contains a gas absorbent, so gases such as hydrogen sulfide generated from the electrode body 200 are absorbed by the film 20. Therefore, gases such as hydrogen sulfide are less likely to be released to the outside through the hole 500C of the lid body 500.
• the film 20 when the lid body 500 is composed of a member divided into at least a first portion 510 and a second portion 520, the film 20 may be disposed at least partially between the first portion 510 and the second portion 520. Also, for example, when the lid body 500 is composed of one part and the electrode terminal 300 is disposed between the top surface of the lid body 500 and the exterior member 101, the film 20 as the terminal adhesive film 530 may be disposed between the top surface of the lid body 500 and the exterior member 101.
• the second sealing portion 120 is formed by folding the exterior member 101 and heat-sealing the heat-sealable resin layers of the exterior member 101.
• the method of forming the second sealing portion 120 is not limited to this.
• FIG. 30 is a plan view that shows a schematic diagram of the power storage device 10 having a second sealing portion 120Y of a modified example.
• the exterior member 101 has a protruding portion 101XA that extends outward from the exterior body 100, and the heat-sealable resin layers of the protruding portion 101XA are heat-sealed to each other to form the second sealing portion 120Y.
• the heat-sealable resin layer of the protruding portion 101XA and the electrode terminal 300 are heat-sealed.
• the second sealing portion 120Y can be heat-sealed more firmly, so that the sealing property of the exterior body 100 is improved.
• the protruding portion 101XA may be cut as necessary except for the portion heat-sealed to the electrode terminal 300. This modification can also be applied to the modification shown in FIG.
• the method of forming the first sealing portion 110 can be selected arbitrarily.
• the manufacturing apparatus may form the first sealing portion 110 by pressing the seal bar 800 to a position away from the base 135X of the portion 110Y of the exterior body 100 where the first sealing portion 110 is to be formed (see FIG. 8) in step S110.
• the first sealing portion 110 is formed with a recess 110X, which is a trace of the seal bar 800 being pressed.
• the surfaces (thermally adhesive resin layers) of the exterior member 101 facing each other are directly joined to each other.
• a poly pool 900 in which a part of the resin constituting the exterior member 101 has melted out is formed between the surfaces of the exterior member 101 facing each other.
• the surfaces (thermally adhesive resin layers) of the exterior member 101 facing each other are joined via the poly pool 900. That is, in this modified example, the first sealing portion 110 includes a portion where the surfaces of the exterior member 101 facing each other are directly joined, and a portion where the surfaces of the exterior member 101 facing each other are joined via the poly pool 900.
• the poly pool 900 prevents water vapor and the like from entering the interior of the exterior body 100 from the outside, thereby improving the barrier property of the exterior body 100. Note that when the seal bar 800 is pressed against the portion 110Y, it is necessary that the surfaces of the exterior member 101 facing each other in the portion where the poly pool 900 is formed, in other words, in the portion between the recess 110X and the base 135X, are in contact with each other.
• the distance X between the root 135X and the edge 810 of the seal bar 800 in the LR direction can be selected arbitrarily.
• the distance X is preferably, for example, 1 mm or more, more preferably 1.5 mm or more, and even more preferably 1.7 mm or more.
• the distance X is preferably, for example, 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less.
• the preferred range of the distance X is, for example, about 1 mm or more and 10 mm or less, about 1 mm or more and 5 mm or less, about 1 mm or more and 3 mm or less, about 1.5 mm or more and 10 mm or less, about 1.5 mm or more and 5 mm or less, about 1.5 mm or more and 3 mm or less, about 1.7 mm or more and 10 mm or less, about 1.7 mm or more and 5 mm or less, and about 1.7 mm or more and 3 mm or less.
• the distance X is most preferably, for example, 2 mm.
• the distance X may be substantially 0.
• the seal bar 800 When the distance X is substantially 0, the seal bar 800 is pressed against the exterior body 100 so that the base 135X and the edge 810 of the seal bar 800 substantially coincide with each other.
• substantially coinciding includes a case where the base 135X and the edge 810 of the seal bar 800 completely coincide with each other, and a case where the positions of the base 135X and the edge 810 of the seal bar 800 are slightly shifted due to an error during manufacturing or the like. Therefore, the distance X being substantially 0 also includes a case where the distance X is less than 1 mm, for example.
• the distance between the base 135X and the recess 110X may not be constant.
• the distance X may be the distance between the center of the recess 110X and the center of the base 135X in the FB direction.
• the distance X may be calculated based on the average value of multiple values including the maximum and minimum values of the distance between the base 135X and the recess 110X.
• the distance between the base 135X and the recess 110X may not be constant.
• the distance X may be the distance between the center of the base 135X and the center of the recess 110X in the FB direction. In another example, the distance X may be calculated based on the average value of multiple values including the maximum and minimum values of the distance between the recess 110X and the base 135X.
• the exterior body 100X may include a barrier film 91 that suppresses the permeation of the electrolyte.
• the barrier film 91 is preferably disposed at least between the inner surface of the exterior member 101X and the electrode body 200.
• the barrier film 91 is preferably bonded to the inner surface of the exterior member 101X.
• the barrier film 91 is preferably made of a material that allows the gas generated in the exterior body 100X to pass through.
• the material constituting the barrier film 91 is, for example, a resin film or a porous film. Since the exterior body 100X has the barrier film 91, it is possible to suppress the deterioration of the exterior member 101X caused by the electrolyte.
• the exterior body 100 may include a buffer film 92 for increasing the strength of the exterior member 101.
• the buffer film 92 is preferably disposed on at least the corners 100Z of the interior surface of the exterior member 101. Since the exterior body 100 includes the buffer film 92, the occurrence of pinholes in the exterior body 100 can be suppressed.
• the material constituting the buffer film 92 is, for example, a polyester-based material, a polyolefin-based material, or a fluorine-based material.
• the second sealing portion 120 may be formed by joining the interior surface of the exterior member 101 and the electrode terminal 300. It is preferable that the space 93 between the second sealing portion 120 and the electrode body 200 is filled with an electrolyte.
• a terminal adhesive film 30 that adheres to both metal and resin may be disposed between the electrode terminal 300 and the exterior member 101, but in other embodiments, a terminal adhesive film 30 may be disposed in a similar manner.
• a terminal adhesive film 30 that adheres to both metal and resin may be disposed between the lid 400 and the electrode terminal 300, but an adhesive film may also be disposed in the other embodiments in a similar manner.
• Examples 1 and 2 and Comparative Example 1 manufactured electricity storage devices of Examples 1 and 2 and Comparative Example 1, and conducted tests to confirm whether moisture penetrates into the electrode body. Note that, for the sake of convenience of explanation, in the following, among the elements constituting the electricity storage devices of Examples 1 and 2 and Comparative Example 1, elements that are the same as those in the embodiment may be described by using the same reference numerals as those in the embodiment.
• the energy storage devices of Examples 1 and 2 and Comparative Example 1 have a configuration similar to that of the energy storage device 10X of the second embodiment.
• the energy storage devices of Examples 1 and 2 and Comparative Example 1 have two lid bodies 500 (see FIG. 23). However, in the energy storage devices of Examples 1 and 2 and Comparative Example 1, the two lid bodies 500 are not divided into a first portion 510 and a second portion 520.
• the size of the two lid bodies 500 is 100 mm in width, 30 mm in height, and 5 mm in thickness.
• the energy storage devices of Examples 1 and 2 and Comparative Example 1 have an aluminum block instead of the electrode body 200.
• the size of the aluminum block is 100 mm in width, 30 mm in height, and 150 mm in thickness.
• the inventors of the present application bonded the film 20 of the first aspect to the first surface 500A of the two lid bodies 500.
• the size of one sheet of film 20 is 100 mm in width and 30 mm in height.
• the film 20 was used after being left to stand in a vacuum oven (-50 MPa) for 24 hours to dry before testing (before sealing).
• three sheets of film 20 are bonded to each of the first surfaces 500A of the two lid bodies 500.
• six sheets of film 20 are bonded to each of the first surfaces 500A of the two lid bodies 500.
• the film 20 covers almost the entire first surface 500A of the lid body 500.
• the electricity storage device of Comparative Example 1 the film 20 is not bonded to the lid body 500.
• the inventors of the present application wrapped the exterior member 101 around the aluminum block and the two lid bodies 500 to which the film 20 was joined, forming the first sealed portion 110.
• the exterior member 101 is rectangular and measures 300 mm x 160 mm.
• the heat sealing conditions for forming the first sealed portion 110 are a temperature of 190°C, a pressure of 1 MPa, and a time of 3 seconds.
• the inventors formed the second sealed portion 120 by heat sealing the sides (total of eight sides) of the two lids 500 to the exterior member 101.
• the heat sealing conditions for forming the second sealed portion 120 were a temperature of 180°C, a pressure of 0.2 MPa, and a time of 5 seconds.
• the heat seal conditions for strongly heat-sealing the heat-sealable resin layers 101C present in the opening were a temperature of 220°C, a pressure of 0.45 MPa, and a time of 3 seconds.
• the energy storage devices of Examples 1 and 2 and Comparative Example 1 were left in a thermostatic chamber at a temperature of 65°C and a humidity of 90% for one week, and then the exterior member 101 was opened at an arbitrary location, and the moisture content of the salt-free electrolyte inside was measured by the Karl Fischer method.
• the Karl Fischer moisture meter used in this test was a Karl Fischer moisture meter MKC-610 manufactured by Kyoto Electronics Manufacturing Co., Ltd.
• the anolyte used was Chem-Aqua anolyte AGE
• the catholyte used was Chem-Aqua catholyte CGE.
• the moisture content of the salt-free electrolyte after the test was measured three times using 1 g of sample, and the average of the three measurements was used as the measurement result. Note that 1 g of sample includes an error of about 0.95 g to 1.05 g.
• the moisture content of the salt-free electrolyte after the test was 3 mg, after subtracting the moisture content of the salt-free electrolyte before the test.
• the moisture content of the salt-free electrolyte after the test was 1.5 mg, after subtracting the moisture content of the salt-free electrolyte before the test.
• the moisture content of the salt-free electrolyte after the test was 25 mg, after subtracting the moisture content of the salt-free electrolyte before the test.
• the electricity storage device including the film 20 of the first embodiment can suppress the infiltration of moisture from the end of the heat-sealable resin layer 101C of the exterior member 101, and the infiltration of moisture contained in the heat-sealable resin layer 101C of the exterior member 101 into the electrode body 200.
• a first aspect of the film 20 of each of the above embodiments includes the following features.
• Item 1A A resin film for an electricity storage device that is disposed on the inner side of a barrier layer of an exterior member of an electricity storage device, the resin film for an electricity storage device containing a water absorbing agent.
• Item 2A The resin film for a storage battery device according to Item 1A, wherein the water absorbing agent is an inorganic water absorbing agent.
• Item 3A The resin film for a storage battery device according to Item 1A or 2A, wherein the water absorbing agent is at least one selected from the group consisting of calcium oxide, anhydrous magnesium sulfate, magnesium oxide, calcium chloride, zeolite, aluminum oxide, silica gel, alumina gel, and calcined alum.
• Item 4A The group consisting of calcium oxide, anhydrous magnesium sulfate, magnesium oxide, calcium chloride, zeolite, aluminum oxide, silica gel, alumina gel, and calcined alum.
• the resin film for an electricity storage device according to any one of Items 1A to 3A, wherein the content of the water absorbing agent is 0.1 parts by mass or more relative to 100 parts by mass of the resin contained in the resin film for an electricity storage device.
• Item 5A The resin film for a storage battery device according to any one of Items 1A to 4A, which is constituted of two or more layers.
• Item 6A The resin film for a storage battery device according to Item 5A, wherein, of the two or more layers, at least one layer contains the water absorbing agent and at least one layer contains a sulfur-based gas absorbing agent.
• Item 7A is constituted of two or more layers.
• the resin film for an electrical storage device according to any one of Items 1A to 6A, wherein the layer containing the water absorbing agent of the resin film for an electrical storage device contains 0.5 mass parts of the absorbent or more per 100 mass parts of resin.
• Item 8A The resin film for a storage battery device according to any one of Items 1A to 7A, comprising a heat-sealable resin.
• Item 9A The resin film for a storage battery device according to Item 8A, wherein the heat-fusible resin includes at least one selected from the group consisting of polyesters and polyolefins.
• a second aspect of the film 20 of each of the above embodiments includes the following features.
• Item 1B A resin film for an electricity storage device that is disposed on the inner side of a barrier layer of an exterior member of an electricity storage device, the resin film for an electricity storage device containing a sulfur-based gas absorbent.
• Item 2B The resin film for an electricity storage device according to Item 1B, wherein the content of the sulfur-based gas absorbent is 0.1 parts by mass or more per 100 parts by mass of resin contained in the resin film for an electricity storage device.
• Item 3B The resin film for a storage battery device according to item 1B or 2B, wherein the sulfur-based gas absorbent has a maximum particle size of 20 ⁇ m or less and a number average particle size of 0.1 ⁇ m or more and 15 ⁇ m or less.
• Item 4B The resin film for a storage device according to any one of Items 1B to 3B, wherein the sulfur-based gas absorbent includes at least one selected from the group consisting of a sulfur-based gas chemical absorbent and a sulfur-based gas physical absorbent.
• the resin film for a storage battery device according to Item 4B wherein the sulfur-based gas physical absorbent includes at least one selected from the group consisting of hydrophobic zeolite having a SiO 2 /Al 2 O 3 molar ratio of 1/1 to 2000/1, bentonite, and sepiolite.
• Item 6B The resin film for a storage battery device according to Item 4B or 5B, wherein the sulfur-based gas chemical absorbent is a metal oxide or an inorganic material carrying or containing a metal or a metal ion.
• Item 7B The resin film for a storage battery device according to Item 6B, wherein the metal oxide includes at least one selected from the group consisting of CuO, ZnO, and AgO.
• Item 8B The resin film for a storage battery device according to Item 6B or 7B, wherein the metal species in the inorganic material carrying or containing the metal or metal ion is at least one selected from the group consisting of Ca, Mg, Na, Cu, Zn, Ag, Pt, Au, Fe, Al, and Ni.
• Item 9B The layer containing the sulfur-based gas absorbent of the resin film for an electrical storage device contains 5 mass parts of the sulfur-based gas absorbent per 100 mass parts of resin.
• Item 10B The resin film for a storage battery device according to any one of Items 1B to 9B, comprising a heat-sealable resin.
• Item 11B The resin film for a storage battery device according to Item 10B, wherein the heat-fusible resin includes at least one selected from the group consisting of polyesters and polyolefins.

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• 2023
  • 2023-10-12 CN CN202380072520.0A patent/CN120077509A/zh active Pending
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