Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
  • H01G11/80—Gaskets; Sealings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
  • H01G2/10—Housing; Encapsulation
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/004—Details
  • H01G9/08—Housing; Encapsulation
  • H01G9/12—Vents or other means allowing expansion
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/105—Pouches or flexible bags
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/148—Lids or covers characterised by their shape
• • 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
  • H01M50/30—Arrangements for facilitating escape of gases
  • H01M50/317—Re-sealable arrangements
• • 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
  • H01M50/30—Arrangements for facilitating escape of gases
  • H01M50/342—Non-re-sealable arrangements
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• the present invention relates to an electricity storage device and a lid unit.
• Patent Document 1 discloses an example of an electricity storage device.
• This electricity storage device includes an electrode body and an exterior body that seals the electrode body.
• the exterior body includes an exterior film that encases the electrode body so that an opening is formed, and a lid body that is placed on the opening. The exterior film and the lid body are joined together.
• the above-mentioned electricity storage device is a lithium-ion battery, for example, gas may be generated due to the evaporation of the organic solvent in the electrolyte, and the internal pressure of the exterior body may increase. With the above-mentioned electricity storage device, no consideration has been given to discharging gas generated inside the exterior body to the outside.
• the present invention aims to provide an electricity storage device that can discharge gas generated inside the exterior body, and a lid unit for use with this electricity storage device.
• the electricity storage device is an electricity storage device comprising an electrode body and an exterior body that seals the electrode body, the exterior body including an exterior film that encases the electrode body, a lid that seals the electrode body together with the exterior film, and a first sealing portion that is a portion where the exterior film is closed, and the electricity storage device includes at least one of a check valve and an opening valve that are disposed in the first sealing portion.
• the electricity storage device is the electricity storage device according to the first aspect, in which the first sealed portion is a portion sealed by bonding the inner surfaces of the exterior film that face each other, or a portion sealed by bonding the outermost layer and the innermost layer of the exterior film.
• the energy storage device is an energy storage device comprising an electrode body and an exterior body that seals the electrode body, the exterior body including an exterior film that encases the electrode body, a lid that seals the electrode body together with the exterior film, and a second sealing portion in which the lid body and the exterior film are joined, and the energy storage device includes at least one of a check valve and an opening valve that are disposed in the second sealing portion.
• the fourth aspect of the present invention relates to an electric storage device according to the third aspect, in which the lid has a recess formed on the side, and at least one of the check valve and the opening valve is disposed in the recess.
• the fifth aspect of the present invention is an electric storage device according to the third or fourth aspect, in which the electric storage device includes the check valve, the exterior body includes at least two of the lids, and the opening pressure of the check valve arranged in the second sealing portion corresponding to one of the lids is lower than the opening pressure of the check valve arranged in the second sealing portion corresponding to the other lid.
• the sixth aspect of the present invention is an electric storage device according to the third or fourth aspect, wherein the electric storage device includes the opening valve, the exterior body includes at least two of the lids, and the opening pressure of the opening valve arranged in the second sealing portion corresponding to one of the lids is lower than the opening pressure of the opening valve arranged in the second sealing portion corresponding to the other lid.
• the seventh aspect of the present invention is an electric storage device according to the third or fourth aspect, in which the exterior body has at least two lids, and at least one of the check valve and the opening valve is disposed in the second sealing portion corresponding to one of the lids, and the check valve and the opening valve are not disposed in the second sealing portion corresponding to the other lid.
• the electricity storage device is an electricity storage device comprising an electrode body and an exterior body that seals the electrode body, the exterior body including an exterior film that encases the electrode body and a lid that seals the electrode body together with the exterior film, and the electricity storage device is provided with a check valve attached to the lid.
• the electricity storage device is the electricity storage device according to the eighth aspect, in which the exterior body has at least two lids, and the opening pressure of the check valve attached to one of the lids is lower than the opening pressure of the check valve attached to the other lid.
• the energy storage device is the energy storage device according to the eighth aspect, in which the exterior body has at least two lids, one of the lids is equipped with the check valve, and the other lid is not equipped with the check valve.
• the electricity storage device is an electricity storage device comprising an electrode body and an exterior body that seals the electrode body, the exterior body including an exterior film that encases the electrode body and a lid that seals the electrode body together with the exterior film, and the electricity storage device is provided with an opening valve attached to the lid.
• the electricity storage device is the electricity storage device according to the eleventh aspect, in which the exterior body has at least two lids, and the opening pressure of the opening valve attached to one of the lids is lower than the opening pressure of the opening valve attached to the other lid.
• the electricity storage device according to the thirteenth aspect of the present invention is the electricity storage device according to the eleventh aspect, in which the exterior body has at least two lids, one of the lids is equipped with the opening valve, and the other lid is not equipped with the opening valve.
• the electricity storage device is an electricity storage device comprising an electrode body and an exterior body that seals the electrode body, the exterior body including an exterior film that encases the electrode body and a lid that seals the electrode body together with the exterior film, and the electricity storage device is provided with at least one of a check valve and an opening valve that are attached in a position that allows gas generated inside the exterior body to be discharged.
• the electric storage device is the electric storage device according to the fourteenth aspect, and is provided with the check valve and the opening valve, and the opening pressure of the check valve is lower than the opening pressure of the opening valve.
• the lid unit according to the sixteenth aspect of the present invention comprises a lid body used as an exterior body that seals the electrode body, and at least one of a check valve and an opening valve attached to the lid body.
• the electricity storage device of the present invention and the lid unit used in this electricity storage device make it possible to exhaust gas generated inside the exterior body.
• FIG. 1 is a perspective view illustrating an electricity storage device according to a first embodiment.
• 1B is a diagram showing a method for measuring the seal strength of a second sealing portion of the electricity storage device in FIG. 1A.
• 1B is a cross-sectional view showing an example of a layer structure of an exterior film included in the electricity storage device of FIG. 1A.
• FIG. 1B is a diagram showing a state in which an exterior film provided on the electricity storage device in FIG. 1A is unfolded.
• FIG. 1B is a perspective view of a lid provided in the electricity storage device of FIG. 1A.
• FIG. 1B is a front view of a check valve included in the electricity storage device of FIG. 1A .
• FIG. 11 is a perspective view illustrating an electricity storage device according to a second embodiment. 8 is a cross-sectional view taken along line D8-D8 in FIG. 7 .
• FIG. 13 is a perspective view illustrating an electricity storage device according to a third embodiment. 10 is a cross-sectional view showing an example of a layer structure of an exterior film included in the electricity storage device of FIG. 9 .
• FIG. 13 is a perspective view illustrating an electricity storage device according to a fourth embodiment.
• FIG. 4 is a cross-sectional view of an electricity storage device according to a modified example of the first embodiment.
• FIG. 13 is a front view of an electricity accumulation device according to a modified example of the second embodiment.
• FIG. 14 is a front view of a lid provided in the electricity storage device of FIG. 13 .
• FIG. 13 is a front view of an electricity accumulation device according to another modified example of the second embodiment.
• FIG. 16 is a front view of a lid provided in the electricity storage device of FIG. 15 .
• FIG. 13 is a cross-sectional view showing another example of the arrangement of the opening valve included in the electricity accumulation device of the fourth embodiment.
• FIG. 13 is a perspective view of an electricity accumulation device which is a modified example of the electricity accumulation device according to the fourth embodiment.
• FIG. 1A is a plan view showing a schematic diagram of the electric storage device 10 of the first embodiment.
• FIG. 1B relates to a method for measuring the seal strength of the second sealing portion 80 of the electric storage device 10.
• FIG. 2 is a cross-sectional view showing a layer structure of an exterior film 50 provided in the electric storage device 10 of FIG. 1A.
• FIG. 3 is a diagram showing a state in which the exterior film 50 provided in the electric storage device 10 of FIG. 1A is unfolded.
• FIG. 4 is a perspective view of a lid body 60 provided in the electric storage device 10 of FIG. 1A.
• FIG. 5 is a front view of a check valve 90 provided in the electric storage device 10 of FIG. 1A.
• the direction of the arrow UD indicates the thickness direction of the electric storage device 10
• the direction of the arrow LR indicates the width direction of the electric storage device 10
• the direction of the arrow FB indicates the depth direction of the electric storage device 10.
• the directions indicated by the arrows UDLRFB are common to the following figures.
• the power storage device 10 includes an electrode body 20, an electrode terminal 30, and an exterior body 40.
• the electrode body 20 includes electrodes (positive and negative electrodes) constituting a power storage member such as a lithium ion battery, a capacitor, an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, a polyvalent cation battery, or a capacitor, as well as a separator.
• the shape of the electrode body 20 is an approximately rectangular parallelepiped.
• approximately rectangular parallelepiped includes not only a perfect rectangular parallelepiped, but also a solid body that can be regarded as a rectangular parallelepiped by modifying the shape of a portion of the outer surface, for example.
• the shape of the electrode body 20 may be, for example, a cylinder or a polygonal prism.
• the power storage device 10 includes two electrode terminals 30.
• the electrode terminals 30 are metal terminals used for inputting and outputting power to and from the electrode body 20.
• One end of the electrode terminal 30 is electrically connected to an electrode (positive or negative) included in the electrode body 20.
• the other end of the electrode terminal 30 protrudes outward from, for example, an edge of the exterior body 40.
• the electrode terminal 30 only needs to be capable of inputting and outputting power to and from the electrode body 20, and may not, for example, protrude from the exterior body 40.
• the lid body 60 described below is made of, for example, a metal
• the lid body 60 may also function as the electrode terminal 30.
• the lid body 60 functioning as an electrode terminal may or may not protrude from the exterior body 40.
• the metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, or copper.
• the electrode terminal 30 connected to the positive electrode is usually made of aluminum
• the electrode terminal 30 connected to the negative electrode is usually made of copper, nickel, or the like.
• the outermost layer of the electrode body 20 does not necessarily have to be an electrode, and may be, for example, a protective tape or a separator.
• the exterior body 40 seals the electrode body 20.
• the exterior body 40 includes an exterior film 50 and a lid body 60.
• the exterior film 50 encases the electrode body 20.
• the exterior film 50 is wrapped around the electrode body 20.
• the lid body 60 is disposed on the side of the electrode body 20 in the FB direction.
• the electrode body 20 may be housed inside the exterior film 50 configured in a cylindrical shape so that openings 40A are formed at both ends in the FB direction, and the openings 40A may be closed by the lid body 60.
• the electrode body 20 connected to the lid body 60 may be housed inside the exterior film 50 configured in a cylindrical shape so that openings 40A are formed, and the openings 40A may be closed by the lid body 60.
• the electrode terminal 30 is preferably bonded with an adhesive film 31 from the viewpoint of favorable adhesion to the lid 60.
• the adhesive film 31 can be selected from any film that can bond the electrode terminal 30 made of metal and the lid 60 made of resin.
• the adhesive film 31 can be, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the adhesive film 31 can be a single layer or two or more layers of these films. In this embodiment, the adhesive film 31 is bonded to almost the entire portion of the electrode terminal 30 that is covered by the lid 60.
• a storage section for example, there is a method of forming a storage section (recess) in the exterior film 50 through cold forming to accommodate the electrode body 20.
• the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20.
• the exterior film 50 is wrapped so as to contact the outer surface of the electrode body 20.
• the exterior film 50 is wrapped around the outer surface of the electrode body 20 so that it is in contact with the outer surface of the electrode body 20.
• the exterior film 50 is, for example, a laminate (laminate film) having a base layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order. Note that the exterior film 50 does not need to include all of these layers, and for example, it does not need to include the barrier layer 52. In other words, the exterior film 50 only needs to be made of a material that is flexible and easy to bend, and may be made of, for example, a resin film. Note that it is preferable that the exterior film 50 is heat-sealable.
• the substrate layer 51 included in the exterior film 50 is a layer for imparting heat resistance to the exterior film 50 and suppressing the occurrence of pinholes that may occur during processing or distribution.
• the substrate layer 51 is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer.
• the barrier layer 52 can be protected during processing of the exterior film 50 and breakage of the exterior film 50 can be suppressed.
• the stretched polyester resin layer is preferably a biaxially stretched polyester resin layer
• the stretched polyamide resin layer is preferably a biaxially stretched polyamide resin layer.
• the stretched polyester resin layer is more preferably a biaxially stretched polyethylene terephthalate (PET) film
• the stretched polyamide resin layer is more preferably a biaxially stretched nylon (ONy) film.
• the substrate layer 51 may be composed of both a stretched polyester resin layer and a stretched polyamide resin layer. From the standpoint of film strength, the thickness of the base layer 51 is preferably, for example, 5 to 300 ⁇ m, and more preferably 5 to 150 ⁇ m.
• the barrier layer 52 is a layer that at least prevents the intrusion of moisture.
• the barrier layer 52 is bonded to the base layer 51 via, for example, an adhesive layer 54.
• Examples of the barrier layer 52 include metal foil, vapor deposition film, and resin layer having barrier properties.
• the vapor deposition film examples include metal vapor deposition film, inorganic oxide vapor deposition film, and carbon-containing inorganic oxide vapor deposition film
• the resin layer examples include fluorine-containing resins such as polyvinylidene chloride, polymers mainly composed of chlorotrifluoroethylene (CTFE), polymers mainly composed of tetrafluoroethylene (TFE), polymers having fluoroalkyl groups, and polymers mainly composed of fluoroalkyl units, and ethylene-vinyl alcohol copolymers.
• CTFE chlorotrifluoroethylene
• TFE tetrafluoroethylene
• the barrier layer 52 examples include resin films having at least one layer of these vapor deposition films and resin layers. The barrier layer 52 may be provided in multiple layers.
• the barrier layer 52 includes a layer composed of a metal material.
• metal materials constituting the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates.
• metal foil it is preferable to use at least one of aluminum alloy foil and stainless steel foil.
• the layer made of the above-mentioned metal material may contain recycled metal material.
• recycled metal material include recycled aluminum alloy, stainless steel, titanium steel, or steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloy can be obtained by the manufacturing method described in WO 2022/092231.
• the barrier layer 52 may be made of only recycled material, or may be made of a mixture of recycled and virgin materials. Note that recycled metal material refers to metal material that has been made reusable by collecting, isolating, and refining various products used in the city and waste from manufacturing processes. Also, virgin metal material refers to new metal material that has been refined from natural metal resources (raw materials) and is not recycled material.
• the aluminum alloy foil is preferably a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of further improving formability, it is preferably an aluminum alloy foil containing iron.
• the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass.
• an exterior film 50 having better formability can be obtained.
• an exterior film 50 having better flexibility can be obtained.
• the soft aluminum alloy foil examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, etc. may be added as necessary.
• the softening can be performed by annealing or the like. From the viewpoint of improving the mechanical strength of the exterior film 50, it is more preferable that the aluminum alloy foil is a hard aluminum alloy foil composed of, for example, a work-hardened aluminum alloy.
• hard aluminum alloy foils examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-H18, JIS H4160:1994 A8079H-H18, JIS H4000:2014 A8021P-H14, or JIS H4000:2014 A8079P-H14.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. Furthermore, from the viewpoint of providing an exterior film 50 with excellent formability, it is preferable that the stainless steel foil is made of austenitic stainless steel.
• austenitic stainless steels that make up the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.
• the thickness of the barrier layer 52 should at least function as a barrier layer that prevents moisture from penetrating, and may be, for example, about 9 to 200 ⁇ m.
• the thickness of the barrier layer 52 is preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, and particularly preferably about 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably about 10 ⁇ m or more, even more preferably about 20 ⁇ m or more, and more preferably about 25 ⁇ m or more.
• the preferred ranges for the thickness of the barrier layer 52 include about 10 to 85 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 35 ⁇ m, about 20 to 85 ⁇ m, about 20 to 50 ⁇ m, about 20 to 40 ⁇ m, about 20 to 35 ⁇ m, about 25 to 85 ⁇ m, about 25 to 50 ⁇ m, about 25 to 40 ⁇ m, and about 25 to 35 ⁇ m.
• the barrier layer 52 is made of an aluminum alloy foil, the above-mentioned range is particularly preferable.
• the thickness of the barrier layer 52 is preferably about 35 ⁇ m or more, more preferably about 45 ⁇ m or more, even more preferably about 50 ⁇ m or more, and even more preferably about 55 ⁇ m or more, and is preferably about 200 ⁇ m or less, more preferably about 85 ⁇ m or less, even more preferably about 75 ⁇ m or less, and even more preferably about 70 ⁇ m or less.
• the preferable ranges are about 35 to 200 ⁇ m, about 35 to 85 ⁇ m, about 35 to 75 ⁇ m, about 35 to 70 ⁇ m, about 45 to 200 ⁇ m, about 45 to 85 ⁇ m, about 45 to 75 ⁇ m, about 45 to 70 ⁇ m, about 50 to 200 ⁇ m, about 50 to 85 ⁇ m, about 50 to 75 ⁇ m, about 50 to 70 ⁇ m, about 55 to 200 ⁇ m, about 55 to 85 ⁇ m, about 55 to 75 ⁇ m, and about 55 to 70 ⁇ m.
• the high formability of the exterior film 50 makes deep drawing easy, which can contribute to the high capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, even more preferably about 30 ⁇ m or less, and particularly preferably about 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more.
• preferred ranges of the thickness of the stainless steel foil include about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, and about 15 to 25 ⁇ m.
• the barrier layer 52 when the barrier layer 52 is an aluminum foil, it is preferable that at least the surface opposite to the base layer 51 is provided with a corrosion-resistant film in order to prevent dissolution and corrosion.
• the barrier layer 52 may be provided with a corrosion-resistant film on both sides.
• the corrosion-resistant film refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the barrier layer 52 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment such as nickel or chromium, or corrosion prevention treatment by applying a coating agent on the surface of the barrier layer 52.
• the corrosion-resistant film means a film that improves the acid resistance of the barrier layer 52 (acid-resistant film), a film that improves the alkali resistance of the barrier layer 52 (alkali-resistant film), etc.
• the treatment for forming the corrosion-resistant film may be one type, or two or more types may be combined. In addition, it can be formed into 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 metal compounds with excellent corrosion resistance. Note that these treatments may also be included in the definition of chemical conversion treatment.
• the barrier layer 52 has a corrosion-resistant coating
• the corrosion-resistant coating is also included in the barrier layer 52.
• the corrosion-resistant coating prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the substrate layer 51 when the exterior film 50 is formed or wrapped around it, prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by the reaction between the electrolyte and moisture, and in particular prevents dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 52 when the barrier layer 52 is an aluminum alloy foil, and improves the adhesion (wettability) of the surface of the barrier layer 52, preventing delamination between the substrate layer 51 and the barrier layer 52 during heat sealing and between the substrate layer 51 and the barrier layer 52 during forming.
• the barrier layer 52 e.g., aluminum alloy foil
• the heat-sealable resin layer 53 is bonded to the barrier layer 52, for example, via an adhesive layer 55.
• the heat-sealable resin layer 53 included in the exterior film 50 is a layer that provides the exterior film 50 with heat-sealing sealability.
• Examples of the heat-sealable resin layer 53 include resin films made of polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the standpoint of sealability and strength, the thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 has one or more layers with a buffer function (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 53, and more preferably outside the barrier layer 52.
• the buffer layer may be laminated on the outside of the base layer 51, or the base layer 51 may also function as a buffer layer.
• the multiple buffer layers may be adjacent to each other, or may be laminated via the base layer 51, the barrier layer 52, etc.
• the material constituting the buffer layer can be selected from any material having cushioning properties.
• the material having cushioning properties is, for example, rubber, nonwoven fabric, or foam sheet.
• the rubber is, for example, natural rubber, fluororubber, or silicone rubber.
• the rubber hardness is preferably about 20 to 90.
• the material constituting the nonwoven fabric is preferably a material having excellent heat resistance.
• the lower limit of the thickness of the buffer layer is preferably 100 ⁇ m, more preferably 200 ⁇ m, and even more preferably 1000 ⁇ m.
• the upper limit of the thickness of the buffer layer is preferably 5000 ⁇ m, and even more preferably 3000 ⁇ m.
• the preferred range of thickness of the buffer layer is 100 ⁇ m to 5000 ⁇ m, 100 ⁇ m to 3000 ⁇ m, 200 ⁇ m to 5000 ⁇ m, 200 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 5000 ⁇ m, or 1000 ⁇ m to 3000 ⁇ m.
• the most preferred range of thickness of the buffer layer is 1000 ⁇ m to 3000 ⁇ m.
• the lower limit of the buffer layer thickness is preferably 1 mm, more preferably 0.5 mm.
• the upper limit of the buffer layer thickness is preferably 10 mm, more preferably 5 mm, more preferably 2 mm.
• the preferred ranges of the buffer layer thickness are 1 mm to 10 mm, 1 mm to 5 mm, 1 mm to 2 mm, 0.5 mm to 10 mm, 0.5 mm to 5 mm, and 0.5 mm to 2 mm.
• the buffer layer functions as a cushion, preventing the exterior film 50 from being damaged by impact when the energy storage device 10 is dropped or by handling during the manufacture of the energy storage device 10.
• the lid body 60 shown in FIG. 4 is, for example, rectangular and is, for example, a resin molded product made of a resin material.
• the lid body 60 may be formed, for example, by cold forming the exterior film 50, or may be a metal molded product.
• the material constituting the lid body 60 may include at least two or more types of materials selected from metal oxide, carbon material, and rubber material. It may include metal oxide, carbon material, and rubber material.
• the lid body 60 is preferably made up of a resin material.
• "made up of a resin material” means that, when the entire material constituting the lid body 60 is taken as 100% by mass, the resin material content is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.
• the material constituting the lid body 60 can contain materials other than the resin material in addition to the resin material.
• resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenol resin, as well as modified versions of these resins.
• the resin material may be a mixture of these resins, a copolymer, or a modified version of a copolymer.
• the resin material is preferably a heat-sealable resin such as polyester or polyolefin, and more preferably polyolefin.
• the lid 60 may be molded by any molding method.
• polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters.
• copolymer polyesters include copolymer polyesters in which ethylene terephthalate is the main repeating unit.
• polyethylene terephthalate is the main repeating unit and is polymerized with ethylene isophthalate
• polyethylene (terephthalate/isophthalate) polyethylene (terephthalate/adipate)
• polyethylene (terephthalate/sodium sulfoisophthalate) polyethylene (terephthalate/sodium isophthalate)
• polyethylene (terephthalate/phenyl-dicarboxylate) polyethylene (terephthalate/decanedicarboxylate).
• polybutylene terephthalate is the preferred resin material from the viewpoint of increasing heat resistance and pressure resistance.
• polyolefins include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene- ⁇ -olefin copolymers; polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); propylene- ⁇ -olefin copolymers; and ethylene-butene-propylene terpolymers.
• polyolefin resin is a copolymer, it may be a block copolymer or a random copolymer. Of these, polypropylene is preferred as the resin material because of its excellent heat fusion properties and electrolyte resistance.
• the resin as the resin material may contain a filler as necessary.
• fillers include glass beads, graphite, glass fiber, and carbon fiber.
• the melt mass flow rate of the resin material contained in the material that constitutes the lid body 60 is preferably in the range of 1 g/10 min to 80 g/10 min, and more preferably in the range of 5 g/10 min to 60 g/10 min.
• the melt mass flow rate is measured based on JIS K7210-1:2014.
• the lid body 60 may be configured to include a conductive material.
• Configured to include a conductive material means that, when the entire material constituting the lid body 60 is taken as 100% by mass, the content of the conductive material is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.
• the material constituting the lid body 60 can contain, in addition to the conductive material, materials other than the conductive material.
• the conductive material constituting the lid body 60 is, for example, a metal material.
• the metal material constituting the lid body 60 is, for example, aluminum, an aluminum alloy, nickel, copper, or a copper alloy.
• the lid body 60 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the lid body 60 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material constituting the lid body 60 connected to the negative electrode may be copper plated with nickel.
• the material constituting the lid body 60 may contain recycled metal material.
• the lid body 60 is made of a conductive material, the lid body 60 also functions as the electrode terminal 30. Since the electrode terminal 30 can be omitted from the power storage device 10, the configuration of the power storage device 10 can be simplified.
• the lid body 60 When the lid body 60 is composed of a conductive material, the lid body 60 may be joined to the exterior film 50 via an adhesive film.
• the adhesive film can be selected arbitrarily as long as it is a film that can bond the exterior film 50 and the lid body 60.
• the adhesive film is preferably a laminated film having at least a heat-sealable resin layer, a heat-resistant base material layer, and a heat-sealable resin layer in this order.
• the specifications for the heat-sealable resin layer of the adhesive film can be the same as those for the heat-sealable resin layer 53.
• the materials constituting the heat-sealable resin layers on both sides of the adhesive film may be the same or different materials, and are appropriately selected according to the materials constituting the heat-sealable resin layer 53 of the exterior film 50 and the materials constituting the lid body 60.
• the material constituting the heat-sealable resin layer on the side of the adhesive film that is bonded to the lid body 60 is preferably an acid-modified polyolefin resin graft-modified with an acid such as maleic anhydride. It is preferable that the heat-sealing resin layer of the adhesive film on the side that is bonded to the exterior film 50 is made of the same material as the material that constitutes the heat-sealing resin layer 53 of the exterior film 50.
• the heat-resistant substrate layer may be any film made of a heat-resistant resin, such as polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, polypropylene, or other unstretched or stretched films.
• a heat-resistant resin such as polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, polypropylene, or other unstretched or stretched films.
• Polyethylene terephthalate is particularly preferred, as it is inexpensive and has high strength.
• the adhesive film preferably has adhesiveness.
• the adhesive film is disposed between the exterior film 50 and the lid 60 and the second sealing portion 80 (described later) is formed, the adhesive film is less likely to shift position relative to the lid 60 and the exterior film 50.
• an adhesive resin into the heat-sealable resin layer of the adhesive film, adhesiveness can be imparted to the adhesive film.
• the adhesive resin include amorphous polyolefins.
• amorphous polyolefins include amorphous polypropylene and copolymers of amorphous propylene and other ⁇ -olefins.
• the content of the adhesive resin in the base material constituting the heat-sealable resin is preferably 10 to 20% by weight or less.
• the lid body 60 has a first surface 61, a second surface 62, and a sealing surface 63.
• the first surface 61 faces the electrode body 20.
• the second surface 62 is the surface opposite the first surface 61.
• the sealing surface 63 is connected to the first surface 61 and the second surface 62, and is joined to the heat-sealable resin layer 53 of the exterior film 50.
• the sealing surface 63 includes a first sealing surface 63A, a second sealing surface 63B, a third sealing surface 63C, and a fourth sealing surface 63D.
• the first sealing surface 63A constitutes the upper surface of the lid body 60.
• the first sealing surface 63A extends in a first direction (LR direction in this embodiment) in a front view of the lid body 60.
• the second sealing surface 63B and the third sealing surface 63C are connected to the first sealing surface 63A and constitute the side surface of the lid body 60.
• the second sealing surface 63B and the third sealing surface 63C extend in a second direction (UD direction in this embodiment) intersecting the first direction in a front view of the lid body 60.
• the first direction and the second direction are orthogonal in a front view of the lid body 60.
• the first direction and the second direction do not have to be orthogonal in a front view of the lid body 60.
• the fourth sealing surface 63D constitutes the lower surface of the lid body 60.
• the fourth sealing surface 63D extends in the first direction (the LR direction in this embodiment) when the lid 60 is viewed from the front.
• the lid body 60 When the lid body 60 is plate-shaped, it is preferable that the lid body 60 has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged on top of each other. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the sealing surface 63 of the lid body 60 has a certain degree of thickness so that the sealing surface 63 of the lid body 60 and the exterior film 50 can be suitably heat-sealed when forming the second sealing portion 80 described below.
• the minimum value of the thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum value of the thickness of the lid body 60 is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm.
• the maximum value of the thickness of the lid body 60 may be 20 mm or more.
• the preferred ranges for the thickness of the material constituting the lid body 60 are 1.0 mm to 20 mm, 1.0 mm to 15 mm, 1.0 mm to 10 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 10 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, and 4.0 mm to 10 mm.
• the lid body 60 when the lid body 60 is described as being plate-shaped, this does not include a case in which the lid body 60 is composed only of a film as defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the thickness of the lid body 60 may vary depending on the part of the lid body 60. When the thickness of the lid body 60 varies depending on the part, the thickness of the lid body 60 is the thickness of the thickest part.
• the cover 60 further includes boundaries 64, 65, 66, and 67.
• Boundary 64 is the boundary between the first seal surface 63A and the second seal surface 63B.
• Boundary 65 is the boundary between the first seal surface 63A and the third seal surface 63C.
• Boundary 66 is the boundary between the fourth seal surface 63D and the second seal surface 63B.
• Boundary 67 is the boundary between the fourth seal surface 63D and the third seal surface 63C.
• the shapes of boundaries 64 to 67 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 64 to 67 are angular.
• examples of the material constituting the lid body 60 include polyester-based resins such as polyethylene terephthalate-based resins and polybutylene terephthalate-based resins, polyolefin-based resins such as polyethylene-based resins, fluorine-based resins, and polypropylene-based resins, cyclic polyolefin-based resins, and acid-modified polyolefin-based resins obtained by graft-modifying these polyolefin-based resins with an acid such as maleic anhydride.
• polyester-based resins such as polyethylene terephthalate-based resins and polybutylene terephthalate-based resins
• polyolefin-based resins such as polyethylene-based resins, fluorine-based resins, and polypropylene-based resins
• cyclic polyolefin-based resins such as polyethylene-based resins, fluorine-based resins, and polypropylene-based resins
• the main material of the material constituting the lid body 60 and the material constituting the heat-sealable resin layer 53 of the exterior film 50 are the same.
• the main material of the lid 60 and the heat-sealable resin layer 53 is, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the main material is, for example, a material that accounts for 50% or more of the materials contained in the components.
• the lid body 60 is formed with a through hole 60X into which the electrode terminal 30 is inserted.
• the through hole 60X penetrates the first surface 61 and the second surface 62.
• the electrode terminal 30 protrudes to the outside of the exterior body 40 through the through hole 60X formed in the lid body 60.
• a small gap between the through hole 60X of the lid body 60 and the electrode terminal 30 is filled with, for example, resin.
• the position from which the electrode terminal 30 protrudes to the outside can be selected arbitrarily.
• the electrode terminal 30 may protrude to the outside from a hole formed on any of the six surfaces of the exterior body 40.
• a small gap between the exterior body 40 and the electrode terminal 30 is filled with, for example, resin.
• the electrode terminal 30 may protrude to the outside of the exterior body 40 from between the seal surface 63 of the lid body 60 and the exterior film 50.
• the through hole 60X may not be formed in the lid body 60.
• the lid body 60 and the electrode terminal 30 are provided as separate bodies, but the lid body 60 and the electrode terminal 30 may be formed integrally. Note that, even if the electrode terminal 30 does not protrude from the edge of the exterior body 40, the lid body 60 may not have a through hole 60X.
• the exterior film 50 is wrapped around the electrode body 20 so as to have an opening 40A, and the opposing surfaces of the exterior film 50 (thermally adhesive resin layer 53) are heat sealed together to form the first sealing portion 70.
• the first sealed portion 70 is formed by heat sealing a portion including the first edge 50A and a portion including the second edge 50B of the exterior film 50 shown in FIG. 3.
• the first sealed portion 70 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position at which the first sealed portion 70 is formed in the exterior body 40 can be selected arbitrarily.
• the root 70X of the first sealed portion 70 is preferably located on the edge 43 at the boundary between the first surface 41 and the second surface 42 of the exterior body 40.
• the first surface 41 has a larger area than the second surface 42.
• the root 70X of the first sealed portion 70 may be located on any surface of the exterior body 40.
• the first sealed portion 70 protrudes outward from the electrode body 20 in a plan view.
• the first sealed portion 70 may be folded, for example, toward the second surface 42 of the exterior body 40, or toward the first surface 41.
• gas may be generated inside the exterior body 40.
• gas such as volatile organic solvent, carbon monoxide, carbon dioxide, methane, ethane, hydrogen, and hydrogen fluoride may be generated inside the exterior body 40 due to the evaporation of the organic solvent in the electrolyte and the decomposition of the electrolyte.
• the electricity storage device 10 is a capacitor
• gas may be generated inside the exterior body 40 due to a chemical reaction in the capacitor.
• the electrode body 20 may contain a solid electrolyte that may generate gas.
• the solid electrolyte is a sulfide-based material
• hydrogen sulfide gas may be generated.
• the internal pressure of the exterior body 40 increases. For this reason, it is necessary to discharge the gas generated inside the exterior body 40 to the outside of the exterior body 40.
• the manufacturing process of the electricity storage device 10 it is preferable to carry out a process of aging the electricity storage device 10 in a provisionally sealed state in a predetermined temperature environment for a predetermined time period in order to, for example, allow the electrolyte to penetrate the electrode body 20 (hereinafter referred to as the "aging process").
• the aging process gas is generated from the electrode body 20, and it is therefore necessary to discharge the generated gas to the outside of the exterior body 40.
• the electricity storage device 10 is provided with a check valve 90 so that gas generated inside the exterior body 40 can be discharged to the outside of the exterior body 40.
• the check valve 90 can be a known valve-type check valve that allows repeated gas release, such as a ball spring type, poppet type, duckbill type, umbrella type, or diaphragm type.
• the check valve 90 is attached to the first sealing portion 70.
• FIG. 5 is a front view of the check valve 90 of this embodiment.
• the check valve 90 includes a housing 91, a valve mechanism 92, and an attachment portion 93.
• the housing 91 is made of, for example, metal or resin.
• the housing 91 is, for example, cylindrical, and houses the valve mechanism 92 therein.
• An outlet 91A for discharging gas is formed on the end face of the housing 91 opposite the attachment portion 93.
• the housing 91 is located outside the first sealing portion 70.
• the housing 91 may be joined to the exterior film 50 by any means, for example.
• the valve mechanism 92 has a spring, a valve body, and a valve seat. That is, in this embodiment, the check valve 90 is a ball spring type check valve.
• the mounting portion 93 is connected to the housing 91.
• the mounting portion 93 is made of metal or resin.
• the mounting portion 93 may be integral with the housing 91, or may be made separately from the housing 91 and joined to the housing 91.
• the mounting portion 93 is sandwiched between the opposing surfaces (thermally adhesive resin layer 53) of the portion of the exterior film 50 that forms the first sealing portion 70.
• the mounting portion 93 is made of metal, it is preferable that the mounting portion 93 and the exterior film 50 are joined via an adhesive film that adheres favorably to both metal and resin.
• the mounting portion 93 is, for example, cylindrical. From the viewpoint of favorably joining the mounting portion 93 and the exterior film 50, it is preferable that the outer diameter of the mounting portion 93 is smaller than the outer diameter of the housing 91.
• the end face of the mounting portion 93 opposite the housing 91 is formed with an inlet 93A facing the inside of the exterior body 40.
• the valve mechanism 92 opens.
• the valve mechanism 92 opens, the gas passes through the inlet 93A, the inside of the mounting portion 93, the inside of the housing 91, and the outlet 91A, in that order, before being discharged to the outside.
• the second sealing portion 80 is formed by heat sealing the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60.
• the sealing strength between the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60 may be referred to as the sealing strength of the second sealing portion 80.
• the sealing strength of the second sealing portion 80 is the sealing strength between the heat-sealable resin layer 53 and the lid body 60 at the long side portion of the sealing surface 63, i.e., the sealing surface 63 extending in the LR direction (see FIG. 1A).
• the seal strength of the second sealing portion 80 is measured as follows. First, a cut is made in the portion of the exterior film 50 that constitutes the first surface 41 of the exterior body 40, and three belt-shaped members 41X, 41Y, and 41Z (see the two-dot chain line in FIG. 1B) are formed aligned in the LR direction. In the second and subsequent embodiments and modified examples described below, the belt-shaped members 41X, 41Y, and 41Z are formed to avoid the check valve and the opening valve. The width of the three belt-shaped members 41X, 41Y, and 41Z in the LR direction is 15 mm. The ends of the belt-shaped members 41X, 41Y, and 41Z are joined to the lid body 60 at the second sealing portion 80.
• the length of the lid body 60 in the LR direction is 45 mm or more.
• the end of the belt-shaped members 41X, 41Y, and 41Z opposite to the end joined to the lid body 60 is pulled upward in the UD direction (the direction opposite to the first surface 41B) to measure the seal strength of each of the belt-shaped members 41X, 41Y, and 41Z.
• the seal strength of the second sealing portion 80 is the average value of the seal strengths of the belt-shaped members 41X, 41Y, and 41Z.
• the seal strengths of the three belt-shaped members are measured in the same manner as when the length of the lid body 60 in the LR direction is 45 mm or more.
• the obtained seal strengths are each divided by the arbitrary width X mm and multiplied by 15 to convert them into the seal strengths of the three belt-shaped members in a width of 15 mm.
• the seal strength of the second sealing portion 80 is the average value of the seal strengths of the three belt-shaped members converted into a width of 15 mm.
• the seal strength of the second sealing portion 80 is the seal strength of the long side portion of the sealing surfaces 63 of the multiple parts.
• the seal strength of the second sealing portion 80 is preferably 40 N/15 mm or more, more preferably 50 N/15 mm or more, more preferably 60 N/15 mm or more, more preferably 70 N/15 mm or more, and even more preferably 85 N/15 mm or more.
• the seal strength of the second sealing portion 80 is 40 N/15 mm or more, the state where the electrode body 20 is sealed by the exterior body 40 is maintained suitably even if the energy storage device 10 is used for, for example, several years (less than 10 years).
• the seal strength of the second sealing portion 80 is 85 N/15 mm or more, the state where the electrode body 20 is sealed by the exterior body 40 is maintained suitably even if the energy storage device 10 is used for, for example, 10 years or more.
• the seal strength of the second sealing portion 80 is preferably 300 N/15 mm or less.
• the preferred range of the seal strength of the second sealing portion 80 is 40N/15mm to 300N/15mm, 50N/15mm to 300N/15mm, 60N/15mm to 300N/15mm, 70N/15mm to 300N/15mm, or 85N/15mm to 300N/15mm.
• Manufacturing method of electricity storage device> 6 is a flowchart showing an example of a method for manufacturing the power storage device 10.
• the method for manufacturing the power storage device 10 includes, for example, a first step, a second step, a third step, a fourth step, a fifth step, a sixth step, a seventh step, and an eighth step.
• the first step to the eighth step are performed, for example, by a manufacturing apparatus for the power storage device 10.
• the first step to the eighth step are merely names of the steps in the method for manufacturing the power storage device 10 defined for convenience, and do not necessarily refer to the order of the steps.
• step S11 the manufacturing device joins the lid body 60 and the electrode terminal 30.
• step S11 the manufacturing device joins the lid body 60 and the electrode terminal 30.
• step S11 the manufacturing device joins the lid body 60 and the electrode terminal 30.
• step S11 the manufacturing device joins the lid body 60 and the electrode terminal 30.
• the second step of step S12 is performed after the first step.
• the manufacturing apparatus places a pair of lid units 60Z on the sides of the electrode body 20 and joins the electrode terminal 30 and the electrode body 20.
• the manufacturing method for the energy storage device 10 may include, instead of the first and second steps, a step of first joining the electrode body 20 and the electrode terminal 30, and then joining the lid body 60 to the electrode terminal 30 joined to the electrode body 20.
• the third step of step S13 is performed after the second step.
• the manufacturing device wraps the exterior film 50 around the electrode body 20 and the lid body 60.
• the manufacturing device wraps the exterior film 50 around the electrode body 20 and the lid body 60 with tension acting on the exterior film 50 while restricting the movement of the electrode body 20 and the lid body 60 with the restricting means.
• the restricting means is, for example, a groove into which the electrode body 20 and the lid body 60 are fitted.
• the restricting means may be a device that applies an external force to the electrode body 20 and the lid body 60 so that the electrode body 20 and the lid body 60 do not move.
• the restricting means may be a device that applies a force to the electrode body 20 and the lid body 60 in the opposite direction to the direction in which the exterior film 50 is pulled.
• the restricting means may include a roller that runs on the exterior film 50 while the exterior film 50 is being pulled in order to remove wrinkles in the exterior film 50.
• the fourth step of step S14 is performed after the third step.
• the manufacturing device places a check valve 90 in the portion of the exterior film 50 where the first sealing portion 70 is to be formed.
• the fifth step of step S15 is performed after the fourth step.
• the manufacturing equipment forms a first sealed portion (hereinafter referred to as a "temporary first sealed portion") having an unsealed portion for injecting an electrolyte solution.
• the temporary first sealed portion the heat-sealable resin layers 53 of the exterior film 50 facing each other and the mounting portion 93 of the check valve 90 are joined. Note that if the power storage device 10 is, for example, an all-solid-state battery, the step of injecting the electrolyte solution is not necessary, and therefore in the fifth step, the manufacturing equipment forms the first sealed portion 70 with the check valve 90 in place.
• the sixth step of step S16 is performed after the fifth step.
• the manufacturing device forms the second sealing portion 80 by heat sealing the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60.
• step S17 is performed after the sixth step.
• the manufacturing device injects the electrolyte through the unsealed portion formed in the temporary first sealing portion.
• the eighth step of step S18 is performed after the seventh step is completed.
• the manufacturing apparatus forms the first sealed portion 70 by heat sealing a portion including an unsealed portion of the temporary first sealed portion. If the check valve 90 is not provided in the fifth step, the check valve 90 may be provided in the first sealed portion 70 in the eighth step. Note that if the power storage device 10 is, for example, an all-solid-state battery, the seventh and eighth steps are omitted.
• an aging step is performed. Gas generated in the aging step is discharged to the outside via the check valve 90.
• the electricity storage device 10 includes the check valve 90, gas generated inside the exterior body 40 can be discharged to the outside.
• an electricity storage device that does not have a check valve (hereinafter referred to as a "virtual electricity storage device")
• a gas pocket includes the temporary first sealing portion 70 as well as an extended portion of the exterior film 50.
• the portion of the exterior film 50 that extends beyond the first sealing portion 70 is cut off after the aging process is completed. For this reason, the virtual electricity storage device requires an exterior film 50 that is larger in size than the exterior film 50 provided in the finished virtual electricity storage device.
• a check valve 90 is placed in the fourth step, so the gas generated in the aging step is discharged through the check valve 90. Therefore, in the electricity storage device 10, there is no need to form a gas pocket to store the gas generated in the aging step. In the electricity storage device 10, a small portion of the exterior film 50 is discarded, so the manufacturing cost can be reduced.
• a portion of the portion of the first sealed portion 70 corresponding to the base 70X is heat-sealed to form a gas pocket.
• the portion of the base 70X that was heat-sealed when the gas pocket was formed is heat-sealed again to form the first sealed portion 70.
• a portion of the base 70X is heat-sealed multiple times, and the strength of the base 70X decreases. For this reason, for example, if the first sealed portion 70 is folded toward the first surface 41 or the second surface 42, the base 70X of the first sealed portion 70 may be damaged, causing leakage of the electrolyte, etc.
• the electricity storage device 10 can discharge gas by the check valve 90, the unsealed portion of the temporary first sealed portion formed in the fifth step only needs to be large enough to inject the electrolyte. Therefore, the area that is heat sealed when forming the first sealed portion 70 in the eighth step may be a small area that includes the unsealed portion of the temporary first sealed portion. Since the area of the first sealed portion 70 that is heat sealed multiple times is small in the electricity storage device 10, the strength of the base 70X of the first sealed portion 70 is less likely to decrease. Therefore, even if the first sealed portion 70 is folded toward the first surface 41 or the second surface 42, the electricity storage device 10 can suppress damage to the base 70X.
• the gas pocket is mobile, there is a risk that the portion including the base may be damaged due to material fatigue or when an external force such as bending or pulling is applied.
• the base of the gas pocket coincides with the base 70X of the first sealing portion 70.
• the electricity storage device 10 can discharge gas using the check valve 90, so there is no need to form a gas pocket during manufacture. This makes it possible to prevent damage to the base 70X of the first sealing portion 70.
• the power storage device 200 of the second embodiment differs from the power storage device 10 of the first embodiment in the location where the check valve 90 is disposed, but the other configuration is similar to that of the power storage device 10 of the first embodiment.
• the following describes the power storage device 200 of the second embodiment, focusing on the differences from the power storage device 10 of the first embodiment.
• Fig. 7 is a perspective view that illustrates an electric storage device 200 according to the second embodiment.
• Fig. 8 is a cross-sectional view taken along line D8-D8 in Fig. 7.
• the check valve 90 is attached to the lid body 60.
• the check valve 90 and the lid body 60 constitute a lid unit 260Z.
• the lid unit 260Z is manufactured, for example, by injection molding the material constituting the lid body 60 onto the check valve 90 placed in a mold, i.e., by insert molding.
• a hole is formed in the lid body 60, and the mounting portion 93 of the check valve 90 is inserted into the hole.
• the mounting portion 93 of the check valve 90 is embedded inside the lid body 60.
• At least a portion of the housing 91 may be embedded inside the lid body 60.
• the position of the inlet 93A of the mounting portion 93 can be selected arbitrarily.
• the inlet 93A may be located on the first surface 61 of the lid body 60, may be located closer to the electrode body 20 than the first surface 61 of the lid body 60, or may be located inside the lid body 60. From the viewpoint of suppressing interference between the check valve 90 and the electrode body 20, it is preferable that the inlet 93A is as far away from the electrode body 20 as possible. In the example shown in FIG. 8, the inlet 93A is located on the first surface 61 of the lid body 60.
• the check valve 90 may be attached to one lid body 60 and the other lid body 60.
• the opening pressure of the check valve 90 attached to one lid body 60 is lower than the opening pressure of the check valve 90 attached to the other lid body 60.
• Gas generated inside the exterior body 40 is discharged from the check valve 90 attached to one lid body 60 before the check valve 90 attached to the other lid body 60. This allows the location where the gas is discharged to be limited.
• the electricity storage device 300 of the third embodiment differs from the electricity storage device 10 of the first embodiment in that it includes a first sealing portion 370 and in the location where a check valve 90 is disposed, but the other configurations are similar to those of the electricity storage device 10 of the first embodiment.
• the electricity storage device 300 of the third embodiment will be described below, focusing on the parts that differ from the electricity storage device 10 of the first embodiment.
• Fig. 9 is a perspective view that illustrates an example of an electric storage device 300 according to a third embodiment.
• Fig. 10 is a cross-sectional view that illustrates an example of a layer structure of an exterior film 50 that is included in the electric storage device 10.
• the power storage device 300 includes a first sealed portion 370.
• the first sealed portion 370 is a portion that is sealed by joining the outermost layer and the innermost layer of the exterior film 50 when wrapped around the electrode body 20.
• the exterior film 50 has a heat-sealable resin layer 56 laminated on the substrate layer 51 opposite the barrier layer 52.
• the heat-sealable resin layer 56 is bonded to the substrate layer 51, for example, via an adhesive layer 57.
• the outermost layer of the exterior film 50 is the heat-sealable resin layer 56, and the innermost layer is the heat-sealable resin layer 53, so that the first sealing portion 370 can be suitably formed.
• the heat-sealable resin layer 53 and the heat-sealable resin layer 56 may be bonded with an adhesive or the like.
• the outermost layer of the exterior film 50 is the substrate layer 51, and the innermost layer is the heat-sealable resin layer 53. Therefore, when the exterior film 50 has the layer structure shown in FIG. 2, the outermost layer and the innermost layer may be joined, for example, by an adhesive. In the example shown in FIG. 10, at least the base layer 51 may be omitted.
• the position of the second edge 50B of the exterior film 50 can be selected arbitrarily.
• the second edge 50B may be located on the first surface 41 of the exterior body 40, on the second surface 42, or on the edge 43 at the boundary between the first surface 41 and the second surface 42.
• the check valve 90 is disposed in the first sealing portion 370.
• the attachment portion 93 of the check valve 90 is joined to the exterior film 50 while being sandwiched between the outermost layer and the innermost layer of the exterior film 50.
• the power storage device 300 includes the check valve 90, gas generated inside the exterior body 40 can be discharged to the outside.
• the power storage device 400 of the fourth embodiment differs from the power storage device 10 of the first embodiment in that it includes opening valves 491 and 492, but other configurations are similar to those of the power storage device 10 of the first embodiment.
• the following describes the power storage device 400 of the fourth embodiment, focusing on the differences from the power storage device 10 of the first embodiment.
• FIG. 11 is a perspective view showing a schematic diagram of an electric storage device 400 according to a fourth embodiment.
• the electric storage device 400 includes opening valves 491 and 492.
• the opening valves 491 and 492 are films that release gas by peeling or cohesive failure when gas is generated inside the exterior body 40 and the internal pressure of the exterior body 40 rises.
• the material constituting the opening valves 491 and 492 can be selected arbitrarily as long as it can function as an opening valve.
• the material constituting the opening valves 491 and 492 can be, for example, the material exemplified for the adhesive film 31.
• the material constituting the opening valves 491 and 492 preferably includes at least one resin layer having a melting peak temperature 5° C. or more lower than the heat-sealable resin layer 53 of the exterior film 50.
• the adhesive film preferably includes at least one resin layer having a melting peak temperature of 100° C. or more and 135° C. or less.
• the opening valves 491 and 492 are arranged at any position in the exterior body 40 where gas generated inside the exterior body 40 can be discharged.
• the opening valve 491 is arranged in the first sealing portion 70.
• the opening valve 492 is arranged in the second sealing portion 80.
• One of the opening valves 491 and 492 may be omitted.
• the opening valve 491 is bonded to the opposing heat-sealable resin layers 53 of the exterior film 50. When the internal pressure of the exterior body 40 increases, the opening valve 491 peels off from at least one of the opposing heat-sealable resin layers 53, forming an opening in the first sealed portion 70. Gas generated inside the exterior body 40 passes through the opening formed in the first sealed portion 70 and is discharged to the outside.
• the opening valve 492 is disposed between the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60, in other words, in the second sealing portion 80.
• the opening valve 492 is joined to the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60.
• the opening valve 492 peels off from at least one of the heat-sealable resin layer 53 and the sealing surface 63 of the lid body 60, forming an opening in the second sealing portion 80. Gas generated inside the exterior body 40 passes through the opening formed in the second sealing portion 80 and is discharged to the outside.
• the opening valve 492 and the lid body 60 constitute the lid unit 460Z.
• the manufacturing method of the electric storage device 400 of the fourth embodiment preferably includes a process of forming a gas pocket that stores the gas generated by the aging process.
• a check valve 90 is disposed in the first sealing portion 70, the second sealing portion 80, or the lid body 60 of the electricity storage device 400, the process of forming a gas pocket is not necessary in the manufacturing method of the electricity storage device 400 of the fourth embodiment.
• the opening valve 492 may be disposed in the second sealing portion 80 corresponding to one of the lid bodies 60 and in the second sealing portion 80 corresponding to the other lid body 60.
• the opening pressure of the opening valve 492 disposed in the second sealing portion 80 corresponding to one of the lid bodies 60 is preferably lower than the opening pressure of the opening valve 492 disposed in the second sealing portion 80 corresponding to the other lid body 60.
• Gas generated inside the exterior body 40 is discharged from the opening valve 492 disposed in the second sealing portion 80 corresponding to one of the lid bodies 60 before the opening valve 492 disposed in the second sealing portion 80 corresponding to the other lid body 60. For this reason, the location from which the gas is discharged can be limited.
• the gas can be discharged by peeling off the opening valve 492 disposed in the second sealing portion 80 corresponding to the other lid body 60.
• the opening pressure of the opening valve 492 is defined as follows.
• a virtual electricity storage device 10 is prepared in which the electrode body 20 and the other lid body 60 are omitted from the electricity storage device 400.
• An air supply jig is attached to any of the pair of first surfaces 41 and the pair of second surfaces 42 of the virtual electricity storage device.
• a fixing jig is placed on the pair of first surfaces 41 and the pair of second surfaces 42 of the virtual electricity storage device in a state in which the air supply jig is attached, and the virtual electricity storage device is fixed. Air is supplied from the air supply jig to the inside of the exterior body.
• the pressure when the opening valve 492 arranged in the second sealing portion 80 corresponding to one of the lid bodies 60 is peeled off and the gas is discharged is the opening pressure of the opening valve 492.
• the opening pressure is measured with the valves other than the opening valve 492, which is the object of the opening pressure measurement, closed.
• the opening pressure of the opening valve 492 disposed in the second sealing portion 80 corresponding to the other lid body 60 can be determined in a similar manner using a hypothetical electricity storage device 10 in which the electrode body 20 and one of the lid bodies 60 are omitted from the electricity storage device 400.
• the opening valve 492 may be disposed only in the second sealing portion 80 that corresponds to one of the lid bodies 60 of the second sealing portion 80. In other words, the opening valve 492 is not disposed in the second sealing portion 80 that corresponds to the other lid body 60. In this case, the location where the gas is discharged can be limited.
• the above-mentioned embodiments are examples of forms that the electricity storage device and the lid unit according to the present invention can take, and are not intended to limit the forms.
• the electricity storage device and the lid unit according to the present invention can take forms different from those exemplified in the embodiments.
• One example is a form in which a part of the configuration of each embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to each embodiment.
• modified versions of each embodiment are shown. The following modified versions can be combined with each other as long as they are not technically inconsistent.
• the check valve 90 may be a non-permeable gas-venting film that is permeable to gas but not permeable to moisture.
• the non-permeable gas-venting film may be composed of a laminate including at least a base layer and an adhesive layer.
• the non-permeable gas-venting film has a water vapor transmission rate of preferably 10 cc/m 2 /day or less, more preferably 5 cc/m 2 /day or less, even more preferably 2 cc/m 2 /day or less, and even more preferably 0 cc/m 2 /day when left to stand in an environment of 60°C and 90 % RH for 48 hours.
• the method for measuring the water vapor transmission rate of the non-permeable gas-venting film is as follows.
• the water vapor transmission rate is measured in an environment of 60°C and 90% RH in accordance with the cup method of JIS Z 0208.
• the test piece is cut into a sample of 75 mm ⁇ , and three 5 mm ⁇ holes are drilled 5 mm inward from the outer circumference and set in a jig using a screw-tightening method.
• a cup with a transmission area of 60 mm ⁇ is used.
• the non-permeable gas-venting film preferably has a carbon dioxide permeability of 5000 cm3 /( m2 ⁇ 24h ⁇ atm) or more, more preferably 8000 cm3 /( m2 ⁇ 24h ⁇ atm) or more, and even more preferably 10000 cm3 /( m2 ⁇ 24h ⁇ atm) or more.
• the upper limit of the carbon dioxide permeability of the non-permeable gas-venting film 1 of the present disclosure may be, for example, 100000 cm3 /( m2 ⁇ 24h ⁇ atm) or less.
• the method for measuring the carbon dioxide permeability of the non-permeable gas-venting film is as follows.
• the carbon dioxide permeability of the film is measured under the following conditions in accordance with the test items: gas permeability and gas permeability coefficient specified in JIS K 7126-1:2006 (differential pressure method).
• the non-permeable gas-venting film preferably has an oxygen permeability of 50 cm3 /( m2 ⁇ 24h ⁇ atm) or more, more preferably 100 cm3 /( m2 ⁇ 24h ⁇ atm) or more, and even more preferably 200 cm3 /( m2 ⁇ 24h ⁇ atm) or more.
• the upper limit of the oxygen permeability of the non-permeable gas-venting film of the present disclosure may be, for example, 100,000 cm3 /( m2 ⁇ 24h ⁇ atm) or less.
• the method for measuring the oxygen permeability of the non-permeable gas-venting film 1 is as follows.
• the measurement is performed in the following procedure.
• a carrier gas is supplied to the device at a flow rate of 10 cc/min for 60 minutes or more to purge the device.
• the carrier gas can be nitrogen gas containing about 5% hydrogen.
• the test gas is flowed into the device, and 12 hours are secured as the time from the start of flow until the equilibrium state is reached, and then the measurement is started under the above temperature and humidity conditions.
• the test gas used is dry oxygen containing at least 99.5% (volume) oxygen. At least three samples are measured under one condition, and the average of the measured values is taken as the oxygen permeability value under that condition.
• polyolefin resins have low water vapor permeability and high carbon dioxide permeability, and are suitable as resins for constituting the non-water-permeable gas-venting film of this modified example.
• a hole may be formed at any position in the exterior film 50, and the check valve 90 may be disposed in the hole. This can be similarly applied to the electricity storage device 200 of the second embodiment, the electricity storage device 300 of the third embodiment, and the electricity storage device 400 of the fourth embodiment.
• the configuration of the power storage device 10 can be changed arbitrarily.
• the power storage device 10 may include at least one of the opening valve 491 and the opening valve 492 included in the power storage device 400 of the fourth embodiment. This modification can be similarly applied to the power storage device 200 of the second embodiment and the power storage device 300 of the third embodiment.
• FIG. 12 is a cross-sectional view of the electric storage device 10 according to a modified example of the first embodiment.
• the lid body 60 may include a lid body 60A and a covering body 60B.
• the lid body 60A is preferably configured to include a conductive material.
• the covering body 60B covers a part of the lid body 60A.
• the covering body 60B is preferably configured to include a resin material.
• the sealing surface 63 of the lid body 60 is formed on the covering body 60B.
• the covering body 60B preferably has a protruding portion 68 protruding from the sealing surface 63.
• the protruding portion 68 may be omitted.
• the protruding portion 68 may be formed integrally with the portion constituting the sealing surface 63 of the covering body 60B, or may be formed separately from the portion constituting the sealing surface 63 of the covering body 60B and joined to the portion constituting the sealing surface 63 of the covering body 60B.
• the protrusion 68 is preferably formed at a location on the sealing surface 63 where the root 70X of the first sealing portion 70 is located. In the example shown in Fig.
• the root 70X of the first sealing portion 70 is located at the boundary 64 of the lid body 60.
• the protrusion 68 is preferably formed at the boundary 64 on the sealing surface 63.
• the first sealing portion 70 is sealed with the protrusion 68 sandwiched between them.
• This modified example can be similarly applied to the power storage device 200 of the second embodiment, the power storage device 300 of the third embodiment, and the power storage device 400 of the fourth embodiment.
• Fig. 13 is a front view of an electric storage device 200X according to a modification of the second embodiment.
• Fig. 14 is a front view of the lid 60 of Fig. 13.
• the check valve 90 may be disposed in the second sealing portion 80. At least a portion of the check valve 90 is sandwiched between the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid body 60. From the viewpoint of improving the sealing performance of the second sealing portion 80, as shown in FIG. 13, it is preferable that a recess 69 is formed in the sealing surface 63 of the lid body 60 in which any portion of the check valve 90 facing the sealing surface 63 is disposed. In this modification, the check valve 90 may be a non-permeable gas venting film. An opening valve 492 may be disposed in the recess 69.
• the check valve 90 When the check valve 90 is disposed in the second sealing portion 80, the check valve 90 may be disposed in the second sealing portion 80 corresponding to one of the lids 60 and the second sealing portion 80 corresponding to the other lid 60. In this case, it is preferable that the opening pressure of the check valve 90 disposed in the second sealing portion 80 corresponding to one of the lids 60 is lower than the opening pressure of the check valve 90 disposed in the second sealing portion 80 corresponding to the other lid 60. Gas generated inside the exterior body 40 is discharged from the check valve 90 disposed in the second sealing portion 80 corresponding to one of the lids 60 before the check valve 90 disposed in the second sealing portion 80 corresponding to the other lid 60. Therefore, the location where the gas is discharged can be limited.
• the check valve 90 may be disposed only in the second sealing portion 80 that corresponds to one of the lid bodies 60 of the second sealing portion 80. In other words, the check valve 90 is not disposed in the second sealing portion 80 that corresponds to the other lid body 60. In this case, the location where the gas is discharged can be limited.
• Fig. 15 is a front view of an electric storage device 200Y according to another modified example of the second embodiment.
• Fig. 16 is a front view of the lid 260 of Fig. 15.
• the power storage device 200Y includes a lid 260.
• the power storage device 200Y may include at least one of a check valve 90 and an opening valve 492.
• the lid 260 is composed of multiple divided parts. In the example shown in FIG. 15, the lid 260 includes a first part 261 and a second part 262. The lid 260 may be divided into three or more parts.
• the first part 261 and the second part 262 are preferably formed with recesses 261A, 262A in which the electrode terminal 30 is disposed. If the power storage device 200Y includes a check valve 90, the check valve 90 is sandwiched between the first part 261 and the second part 262.
• the first part 261 and the second part 262 are preferably formed with recesses 261B, 262B in which any portion of the check valve 90 that faces the first part 261 and the second part 262 is disposed.
• the opening valve 492 may be attached between the first part 261 and the second part 262 of the lid body 260.
• the opening valve 492 may be attached to one of the lid bodies 260 and the other lid body 260.
• the opening pressure of the opening valve 492 attached to one of the lid bodies 260 is lower than the opening pressure of the opening valve 492 attached to the other lid body 260.
• Gas generated inside the exterior body 40 is discharged from the opening valve 492 attached to one of the lid bodies 260 before the opening valve 492 attached to the other lid body 260. Therefore, the location from which the gas is discharged can be limited.
• the gas can be discharged by peeling off the opening valve 492 attached to the other lid body 260.
• the opening valve 492 may be attached to only one of the lid bodies 260 and the other lid body 260. In other words, the opening valve 492 is not attached to the other lid body 260. In this case, the location where gas is discharged can be limited.
• the opening valve 492 may be attached between the lid body 60A and the covering body 60B as shown in FIG. 12.
• a check valve 90 may be disposed in at least one of the second sealing portion 80 and the lid body 60.
• the check valve 90 disposed in the first sealing portion 70 may be omitted.
• opening valves 491, 492 may be disposed in at least one of the first sealing portion 70 and the second sealing portion 80.
• the location where the opening valve 492 is arranged can be changed arbitrarily.
• the opening valve 492 may be arranged between the electrode terminal 30 and the exterior film 50.
• the opening valve 492 is joined to the electrode terminal 30 and the exterior film 50.
• the opening valve 492 peels off from at least one of the heat-sealable resin layer 53 of the exterior film 50 and the electrode terminal 30, and an opening is formed in the second sealing portion 80. Gas generated inside the exterior body 40 passes through the opening formed in the second sealing portion 80 and is discharged to the outside.
• the check valve 90 may be disposed in at least one of the first sealing portion 70, the second sealing portion 80, and the lid body 60.
• the opening pressure of the check valve 90 is preferably lower than the opening pressures of the opening valves 491, 492.
• the configuration of the first sealing portion 70 can be changed as desired as long as it is closed by the exterior film 50.
• the first sealing portion 70 may be a portion in which the inner surfaces of the exterior film 50 are joined together with a first edge 50A and a second edge 50B of the exterior film 50 butted against each other.
• the inner surfaces of the exterior film 50 may be joined together by, for example, a front-back tape or an adhesive.
• it is preferable that the first sealing portion 70 is folded toward the first surface 41. This modification can be similarly applied to the first to third embodiments.
• the exterior film 50 of the power storage device 10 may protrude outward from at least one of the two lid bodies 60 in the FB direction.
• the electrode body 20 is sealed by closing the portion of the exterior film 50 that protrudes outward from the lid body 60.
• the portion of the exterior film 50 that protrudes outward from the lid body 60 may be folded like a Gabeltop pouch or a brick pouch.
• the length of the electrode terminal in the FB direction is preferably such that it is exposed from the portion of the exterior film 50 that protrudes outward from the lid body 60. This modification can be similarly applied to the second to fourth embodiments.
• the exterior body 40 may not have one of the two lid bodies 60.
• the electrode body 20 in a portion of the exterior body 40 where the lid body 60 is omitted, the electrode body 20 is sealed by closing a portion of the exterior film 50 that protrudes outward beyond the electrode body 20.
• the portion of the exterior film 50 that protrudes outward beyond the electrode body 20 may be folded like a Gabeltop pouch or a brick pouch. This modification can be similarly applied to the second to fourth embodiments.
• the outer shape of the exterior body 40 can be changed as desired.
• the outer shape of the exterior body 40 may be a cylinder, a prism, or a cube. This modification can be similarly applied to the second to fourth embodiments.
• Electrode body 40 Exterior body 40A: Opening 50: Exterior film 53: Heat-sealable resin layer (innermost layer) 56: Heat-fusible resin layer (outermost layer) 60: Lid body 69: Recess 70, 370: First sealing portion 90: Check valve 60Z: 260Z, 460Z: Lid unit 491, 492: Opening valve

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Sealing Battery Cases Or Jackets (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)
• Gas Exhaust Devices For Batteries (AREA)

Priority Applications (2)

Applications Claiming Priority (4)

Publications (1)

Family

ID=92675177

Family Applications (1)

Country Status (2)

Citations (14)

Family Cites Families (4)

• 2024
  • 2024-03-05 JP JP2024550875A patent/JP7639998B2/ja active Active
  • 2024-03-05 WO PCT/JP2024/008370 patent/WO2024185789A1/ja active Application Filing
  • 2024-11-21 JP JP2024203025A patent/JP2025024181A/ja active Pending

Patent Citations (14)

Also Published As

Similar Documents

Legal Events