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
  • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/103—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
  • H01M50/147—Lids or covers
  • H01M50/148—Lids or covers characterised by their shape
  • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
  • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
• • 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
• • 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, a lid body, a lid unit, and a method for manufacturing an electricity storage device.
• Patent Document 1 discloses an all-solid-state battery as an example of an electricity storage device.
• This all-solid-state battery includes an electrode body and an exterior body that seals the electrode body.
• the exterior body includes an exterior film that is wrapped around the electrode body to have an opening, and a lid body that is placed on the opening. The surfaces of the exterior film that face each other are heat-sealed.
• the portion where the opposing surfaces of the exterior film are heat sealed is folded starting from the base.
• the base since the base may be heat sealed multiple times during the manufacturing process of the electricity storage device, the base and its surroundings are damaged by the heat sealing.
• the sealant layer at the base and its surroundings is thinned by the heat sealing.
• the portion where the opposing surfaces of the exterior film are heat sealed is movable, material fatigue is likely to occur, and therefore it is likely to be damaged by folding even if it is not heat sealed multiple times. For this reason, if the exterior film is folded starting from the base, the portion of the exterior film that constitutes the base and its surroundings may be damaged, and the airtightness of the electricity storage device may be reduced.
• the present invention aims to provide an electricity storage device in which an electrode body can be suitably sealed with an exterior body, a lid body used in this electricity storage device, a lid unit including this lid body, and a method for manufacturing the electricity storage device.
• the energy storage device comprises an electrode body and an exterior body that seals the electrode body, the exterior body including an exterior film that encases the electrode body so as to form an opening, a lid that is placed in the opening, a protruding portion that protrudes outward from a portion of the exterior film that encases the electrode body, and a first sealing portion in which the opposing surfaces of the exterior film in the protruding portion are sealed, and the protruding portion is folded starting from a position away from the base of the first sealing portion.
• the electric storage device is the electric storage device according to the first aspect, in which the first sealing portion includes a thickness portion that increases in thickness toward the base, the thickness portion has a starting point and an end point that is farther from the base than the starting point, and the protruding portion is folded toward the electrode body from the end point or between the end point and the starting point.
• the energy storage device is the energy storage device according to the first or second aspect, in which the protruding portion has a fold formed at a position away from the base of the first sealing portion.
• the fourth aspect of the present invention is the electric storage device according to the third aspect, in which the fold is a slit that does not penetrate the exterior film.
• the energy storage device is an energy storage device according to any one of the first to fourth aspects, in which the exterior body includes a second sealing portion where the lid body and the exterior film are sealed, the lid body includes a lid seal portion that is sealed to the exterior film and a protrusion that protrudes from the lid seal portion, and the first sealing portion is formed by sealing the opposing surfaces of the exterior film with the protrusion sandwiched between them.
• the sixth aspect of the present invention relates to an electric storage device that is the electric storage device of the fifth aspect, in which the protrusion becomes thicker toward the lid seal portion.
• the seventh aspect of the present invention relates to an electric storage device according to the fifth or sixth aspect, in which the melting point of the material constituting the protrusion is equal to or higher than the melting point of the material constituting the lid seal portion.
• the eighth aspect of the present invention is an electric storage device according to any one of the fifth to seventh aspects, in which the length of the protrusion is 20 mm or less.
• the lid body according to the ninth aspect of the present invention is a lid body used for the exterior of an electricity storage device, the exterior body including an exterior film that encases an electrode body so as to form an opening, the lid body including a lid seal portion that is disposed in the opening and sealed to the exterior film, and a protrusion that protrudes from the lid seal portion.
• the lid body according to the tenth aspect of the present invention is the lid body according to the ninth aspect, in which the protrusion becomes thicker toward the lid seal portion.
• the lid body according to the eleventh aspect of the present invention is the lid body according to the ninth or tenth aspect, in which the melting point of the material constituting the protruding portion is equal to or higher than the melting point of the material constituting the lid seal portion.
• the lid according to the twelfth aspect of the present invention is a lid according to any one of the ninth to eleventh aspects, in which the length of the protrusion is 20 mm or less.
• the lid unit according to the thirteenth aspect of the present invention comprises a lid body according to any one of the ninth to twelfth aspects and an electrode terminal joined to the lid body.
• the manufacturing method of an electric storage device is a manufacturing method of an electric storage device comprising an electrode body and an exterior body sealing the electrode body, the exterior body including an exterior film that encases the electrode body so as to form an opening, a lid body that is placed in the opening, a protruding portion that protrudes outward from a portion of the exterior film that encases the electrode body, and a first sealing portion in which the opposing surfaces of the exterior film in the protruding portion are sealed, and the manufacturing method of the electric storage device includes a step of folding the protruding portion starting from a position away from the base of the first sealing portion.
• the manufacturing method of the electricity storage device is the manufacturing method of the electricity storage device according to the fourteenth aspect, in which the electricity storage device includes a second sealing portion where the lid body and the exterior film are sealed, and the first sealing portion includes a thickness portion that increases in thickness toward the base, and the manufacturing method of the electricity storage device includes a step of forming the second sealing portion using a seal bar, and in the step of forming the second sealing portion, the second sealing portion is formed so that the seal bar does not come into contact with the thickness portion, or the second sealing portion is formed using the seal bar having a sealing surface that follows the outer shape of the thickness portion so that the thickness of the thickness portion is maintained.
• the electricity storage device, lid, lid unit, and method for manufacturing the electricity storage device according to the present invention allow the electrode body to be suitably sealed by the exterior body.
• FIG. 1 is a perspective view of an electricity storage device according to an embodiment.
• 1B is a diagram showing a method for measuring the seal strength of a second sealing portion of the electricity storage device in FIG. 1A.
• 1B is a cross-sectional view showing a layer structure of an exterior film provided in the electricity storage device of FIG. 1A.
• FIG. 1B is a side view of a lid provided 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 front view of the power storage device of FIG.
• FIG. 6 is a front view of the power storage device of FIG. 5 in a state before the protruding portion is folded up.
• FIG. 1B is a flowchart showing an example of a method for manufacturing the electricity storage device of FIG. 1A.
• FIG. 2 is a diagram showing a third step of the method for manufacturing the electricity storage device of FIG. 1A.
• FIG. 1B is a diagram showing a fourth step of the method for manufacturing the electricity storage device of FIG. 1A.
• FIG. 1B is a diagram showing a fifth step of the method for manufacturing the electricity storage device of FIG. 1A.
• 1B is a diagram relating to a fourth step and a fifth step of the method for producing the electricity storage device of FIG. 1A.
• 1B is a diagram showing another example of the fourth step and the fifth step of the method for producing the electricity storage device in FIG. 1A .
• FIG. 1B is a flowchart showing an example of a method for manufacturing the electricity storage device of FIG. 1A.
• FIG. 2 is a diagram showing a third step of the method for manufacturing the electricity storage device of FIG. 1A.
• FIG. 1B
• FIG. 1B is a diagram showing a sixth step of the method for manufacturing the electricity storage device of FIG. 1A.
• 1B is a diagram showing an eighth step of the method for manufacturing the electricity storage device of FIG. 1A.
• FIG. 11 is a cross-sectional view showing a configuration of an electricity storage device according to a second embodiment.
• 16 is a plan view of a lid provided in the electricity storage device of FIG. 15 .
• 13A to 13C are views relating to a third step of the method for manufacturing an electricity storage device according to a modified example of the first embodiment.
• FIG. 18 is a perspective view of the cooling jig of FIG. 17 .
• FIG. 19 is a perspective view of a cooling jig according to another modified example of the cooling jig shown in FIG. 18 .
• FIG. 19 is a perspective view of a cooling jig according to still another modified example of the cooling jig shown in FIG. 18 .
• FIG. 13 is a cross-sectional view showing a configuration of an electricity storage device according to a modified example of the second embodiment.
• FIG. 13 is a cross-sectional view showing the configuration of an electricity storage device according to another modified example of the second embodiment.
• 1 is a table showing test results of electricity storage devices according to examples and comparative examples.
• FIG. 1A is a plan view showing a schematic diagram of the electric storage device 10 of the first embodiment.
• FIG. 1B is a diagram showing a method for measuring the seal strength of the second sealing portion 80 of the electric storage device of FIG. 1A.
• FIG. 2 is a cross-sectional view showing a layer structure of the exterior film 50 provided in the electric storage device 10 of FIG. 1A.
• FIG. 3 is a side view of the lid body 60 provided in the electric storage device 10 of FIG. 1A.
• FIG. 4 is a diagram showing the exterior film 50 provided in the electric storage device 10 of FIG. 1A in an unfolded state.
• FIG. 5 is a front view of the electric storage device 10 of FIG.
• FIG. 1A in a state in which a portion including the protruding portion 50Y is folded.
• FIG. 6 is a front view of the electric storage device 10 of FIG. 5 in a state before the protruding portion 50Y is folded.
• the arrow UD direction indicates the thickness direction of the electric storage device 10
• the arrow LR direction indicates the width direction of the electric storage device 10
• the arrow FB direction indicates the depth direction of the electric storage device 10.
• the directions indicated by the arrows UDLRFB are the same in the subsequent 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 pair of lid bodies 60.
• the exterior film 50 wraps the electrode body 20 so that a pair of openings 40A are formed.
• the exterior film 50 is wrapped around the electrode body 20 so that a pair of openings 40A are formed.
• the electrode body 20 may be housed inside the exterior film 50, which is configured in a cylindrical shape so that a pair of openings 40A are formed, and the openings 40A may be closed by the lid body 60.
• the exterior body 40 has a main body portion 50X and a protruding portion 50Y.
• the main body portion 50X is a portion in which at least the electrode body 20 is wrapped by the exterior film 50.
• the main body portion 50X is a portion in which the electrode body 20 and the lid body 60 are wrapped by the exterior film 50.
• the protruding portion 50Y is a portion of the exterior film 50 that protrudes from the main body portion 50X.
• the main body 50X has a pair of first surfaces 41A, 41B and a pair of second surfaces 42A, 42B.
• the pair of first surfaces 41A, 41B are substantially the same size.
• the pair of second surfaces 42A, 42B are substantially the same size.
• the pair of first surfaces 41A, 41B have a larger area than the pair of second surfaces 42A, 42B.
• the pair of lid bodies 60 are respectively disposed on the sides of the electrode body 20 so as to close the pair of openings 40A.
• a storage section for example, there is a method of forming a storage section (recess) in the exterior film 50 through cold forming to accommodate the electrode body 20.
• the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20.
• the exterior film 50 is wrapped in contact with the outer surface of the electrode body 20.
• the exterior film 50 is wrapped around the outer surface of the electrode body 20 so that it is in contact with the outer surface of the electrode body 20.
• the exterior film 50 is a laminate (laminate film) having, for example, a base layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order.
• the exterior film 50 does not need to include all of these layers, and for example, it may not include the barrier layer 52. That is, the exterior film 50 may be made of a material that is flexible and easy to bend, and may be made of, for example, a resin film.
• the innermost and outermost layers of the exterior film 50 may be the heat-sealable resin layer 53. In this case, the exterior film 50 may encase the electrode body 20 and the lid body 60 by joining the outermost and innermost layers.
• the 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 a soft aluminum alloy foil composed of, for example, an annealed aluminum alloy, and from the viewpoint of further improving formability, it is preferable that the aluminum alloy foil is an iron-containing aluminum alloy foil.
• the iron-containing aluminum alloy foil (100% by mass) the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass.
• an exterior film 50 having better formability can be obtained.
• an exterior film 50 having better flexibility can be obtained.
• the soft aluminum alloy foil examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, etc. may be added as necessary.
• the softening can be performed by annealing or the like. From the viewpoint of improving the mechanical strength of the exterior film 50, it is more preferable that the aluminum alloy foil is a hard aluminum alloy foil composed of, for example, a work-hardened aluminum alloy.
• hard aluminum alloy foils examples include aluminum alloy foils having a composition specified in JIS H4160:1994A8021H-H18, JIS H4160:1994A8079H-H18, JIS H4000:2014A8021P-H14, or JIS H4000:2014A8079P-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 5 to 200 ⁇ m.
• the thickness of the barrier layer 52 is preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, and particularly preferably about 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably about 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 exterior film 50 has high formability, which makes deep drawing easy and can contribute to increasing the capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, even more preferably about 30 ⁇ m or less, and particularly preferably about 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more.
• Preferred ranges for the thickness of the stainless steel foil include about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, and about 15 to 25 ⁇ m.
• the barrier layer 52 when the barrier layer 52 is 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 base layer 51 during molding of the exterior film 50, prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by the reaction between the electrolyte and moisture, and in particular prevents dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 52 when the barrier layer 52 is an aluminum alloy foil, and improves the adhesion (wettability) of the surface of the barrier layer 52, preventing delamination between the base layer 51 and the barrier layer 52 during heat sealing and between the base layer 51 and the barrier layer 52 during molding.
• the barrier layer 52 e.g., aluminum alloy foil
• the heat-sealable resin layer 53 is bonded to the barrier layer 52, for example, via an adhesive layer 55.
• the heat-sealable resin layer 53 included in the exterior film 50 is a layer that provides the exterior film 50 with heat-sealing sealability.
• Examples of the heat-sealable resin layer 53 include resin films made of polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the standpoint of sealability and strength, the thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 has one or more layers with a buffer function (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 53, and more preferably outside the barrier layer 52.
• the buffer layer may be laminated on the outside of the base layer 51, or the base layer 51 may also function as a buffer layer.
• the multiple buffer layers may be adjacent to each other, or may be laminated via the base layer 51, the barrier layer 52, etc.
• the material constituting the buffer layer can be selected from any material having cushioning properties.
• the material having cushioning properties is, for example, rubber, nonwoven fabric, or foam sheet.
• the rubber is, for example, natural rubber, fluororubber, or silicone rubber.
• the rubber hardness is preferably about 20 to 90.
• the material constituting the nonwoven fabric is preferably a material having excellent heat resistance.
• the lower limit of the thickness of the buffer layer is preferably 100 ⁇ m, more preferably 200 ⁇ m, and even more preferably 1000 ⁇ m.
• the upper limit of the thickness of the buffer layer is preferably 5000 ⁇ m, and even more preferably 3000 ⁇ m.
• the preferred range of thickness of the buffer layer is 100 ⁇ m to 5000 ⁇ m, 100 ⁇ m to 3000 ⁇ m, 200 ⁇ m to 5000 ⁇ m, 200 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 5000 ⁇ m, or 1000 ⁇ m to 3000 ⁇ m.
• the most preferred range of thickness of the buffer layer is 1000 ⁇ m to 3000 ⁇ m.
• the lower limit of the thickness of the buffer layer is preferably 0.5 mm.
• the upper limit of the thickness of the buffer layer is preferably 10 mm, more preferably 5 mm, and even more preferably 2 mm.
• the preferred range of the thickness of the buffer layer is 0.5 mm to 10 mm, 0.5 mm to 5 mm, or 0.5 mm to 2 mm.
• the buffer layer functions as a cushion, preventing the exterior film 50 from being damaged by impact when the energy storage device 10 is dropped or by handling during the manufacture of the energy storage device 10.
• the lid body 60 is, for example, plate-shaped and made of, for example, a resin material.
• the lid body 60 may be formed by, for example, 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 among metal oxides, carbon materials, and rubber materials, and may include metal oxides, carbon materials, and rubber materials.
• the lid body 60 has a lid main body 60A.
• the lid main body 60A has a first surface 61, a second surface 62, and a lid seal portion 63.
• the first surface 61 faces the electrode body 20.
• the second surface 62 is the surface opposite to the first surface 61.
• the lid seal portion 63 is connected to the first surface 61 and the second surface 62, and is heat-sealed to the heat-sealable resin layer 53 of the exterior film 50.
• the lid seal portion 63 includes a first seal surface 63A, a second seal surface 63B, a third seal surface 63C, and a fourth seal surface 63D.
• the first seal surface 63A constitutes the upper surface of the lid body 60.
• the first seal surface 63A extends in a first direction (LR direction in this embodiment) in a front view of the lid body 60.
• the second seal surface 63B and the third seal surface 63C are connected to the first seal surface 63A and constitute the side surface of the lid body 60.
• the second seal surface 63B and the third seal surface 63C extend in a second direction (UD direction in this embodiment) intersecting the first direction in a front view of the lid body 60.
• the first direction and the second direction are orthogonal in a front view of the lid body 60.
• the first direction and the second direction do not have to be orthogonal in a front view of the lid body 60.
• the fourth seal surface 63D constitutes the lower surface of the lid body 60.
• the fourth sealing surface 63D extends in the first direction (the LR direction in this embodiment) when the lid 60 is viewed from the front.
• the lid body 60 When the lid body 60 is plate-shaped, it is preferable that the lid body 60 has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged on top of each other. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the lid seal portion 63 of the lid body 60 has a certain degree of thickness so that the lid seal portion 63 of the lid body 60 and the exterior film 50 can be suitably heat-sealed when forming the second sealing portion 80.
• the minimum value of the thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum value of the thickness of the lid body 60 is, for example, 20 mm, more preferably 15 mm, and even more preferably 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 lid seal portion 63 further includes boundaries 64, 65, 66, and 67.
• Boundary 64 is the boundary between the first seal surface 63A and the second seal surface 63B.
• Boundary 65 is the boundary between the first seal surface 63A and the third seal surface 63C.
• Boundary 66 is the boundary between the fourth seal surface 63D and the second seal surface 63B.
• Boundary 67 is the boundary between the fourth seal surface 63D and the third seal surface 63C.
• the shapes of the boundaries 64 to 67 may be angular, or may be rounded by applying R processing. In this embodiment, boundaries 64 to 67 are angular.
• 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 made of a metal material.
• "made of a metal material” means that the content of the metal material is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more, when the entire material constituting the lid body 60 is taken as 100% by mass.
• the material constituting the lid body 60 can contain materials other than metal materials in addition to metal materials.
• the metal material constituting the lid body 60 can be selected arbitrarily.
• the metal material constituting the lid body 60 is, for example, aluminum, aluminum alloy, nickel, copper, or 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 include recycled metal materials.
• 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 at which the electrode terminal 30 protrudes to the outside can be selected arbitrarily.
• the electrode terminal 30 may protrude to the outside from a hole formed in any one of the six surfaces of the exterior body 40.
• a small gap between the exterior body 40 and the electrode terminal 30 is filled with, for example, resin.
• the lid body 60 and the electrode terminal 30 are provided as separate bodies, but the lid body 60 and the electrode terminal 30 may be formed integrally. If the electrode terminal 30 does not protrude from the edge of the exterior body 40, the through hole 60X does not need to be formed in the lid body 60.
• the exterior film 50 is wrapped around the electrode body 20 to have an opening 40A, and the surfaces (thermally adhesive resin layer 53) of the exterior film 50 that face each other in the protruding portion 50Y are heat sealed to form the first sealing portion 70.
• the protruding portion 50Y is configured to include a portion where the first edge 50A and the second edge 50B of the exterior film 50 shown in FIG. 4 are overlapped.
• the first sealing portion 70 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position where the first sealing portion 70 is formed in the exterior body 40 can be selected arbitrarily.
• it is preferable that the root 70X of the first sealing portion 70 is located on the edge 43 at the boundary between the first surface 41A and the second surface 42A of the exterior body 40.
• the root 70X of the first sealing portion 70 may be located on any surface of the exterior body 40.
• the protruding portion 50Y is folded, for example, to the first surface 41A or the second surface 42A of the exterior body 40.
• the protruding portion 50Y is folded toward the second surface 42A of the exterior body 40.
• the second sealed portion 80 is formed by heat sealing the heat-sealable resin layer 53 of the exterior film 50 and the lid seal portion 63 of the lid body 60.
• the second sealed portion 80 has a second long side seal portion 81 and a second short side seal portion 82 (see FIG. 14 for both).
• the second long side seal portion 81 is a portion where the heat-sealable resin layer 53 of the exterior film 50 is sealed to the first seal surface 63A and the fourth seal surface 63D of the lid body 60.
• the second short side seal portion 82 is a portion where the heat-sealable resin layer 53 of the exterior film 50 is sealed to the second seal surface 63B and the third seal surface 63C of the lid body 60.
• the seal strength between the heat-sealable resin layer 53 of the exterior film 50 and the lid seal portion 63 of the lid body 60 may be referred to as the seal strength of the second seal portion 80.
• the seal strength of the second seal portion 80 is the seal strength between the heat-sealable resin layer 53 and the lid body 60 at the second long side seal portion 81, i.e., the lid seal portion 63 extending in the LR (width) direction in 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 41A of the exterior body 40, and three strip-shaped members 41X, 41Y, and 41Z (see the two-dot chain line in Figure 1B) are formed aligned in the LR direction. The width of the three strip-shaped members 41X, 41Y, and 41Z in the LR direction is 15 mm. The ends of the strip-shaped members 41X, 41Y, and 41Z are joined to the lid body 60 at the second sealing portion 80. The length of the lid body 60 in the LR direction is 45 mm or more.
• the seal strength of each of the strip-shaped members 41X, 41Y, and 41Z is measured by pulling the end opposite the end joined to the lid body 60 upward in the UD direction (the direction opposite to the first surface 41B).
• the seal strength of the second sealing portion 80 is the average value of the seal strengths of the strip members 41X, 41Y, and 41Z.
• 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 strip members in a 15 mm width.
• the seal strength of the second sealing portion 80 is the average value of the seal strengths of the three strip members converted into a 15 mm width. Note that when the lid body 60 is divided into multiple parts including long and short sides, the seal strength of the second sealing portion 80 is the seal strength of the long side portion of the lid seal portion 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.
• a predetermined area including the root 70X of the first sealing portion 70 is heat-sealed multiple times, and is therefore severely damaged.
• the heat-sealable resin layer 53 of the exterior film 50 is thin at the root 70X of the first sealing portion 70. Therefore, when the protruding portion 50Y is folded from the root 70X toward the first surface 41A or the second surface 42A, the barrier layer 52, the base material layer 51, and the heat-sealable resin layer 53 may peel off in the portion including the root 70X of the first sealing portion 70, and a crack may occur in the exterior film 50.
• the first sealing portion 70 includes a portion (hereinafter, "thickness portion 90") in which the thickness HA increases toward the root 70X.
• the film thickness portion 90 includes a starting point 90A and an end point 90B that is farther from the root 70X than the starting point 90A.
• the starting point 90A is located outside the surface of the exterior film 50 in the second sealing portion 80.
• the thickness HA of the first sealing portion 70 becomes locally larger at the starting point 90A as it moves outward from the overhang 50Y.
• the thickness HA of the first sealing portion 70 becomes locally smaller at the end point 90B as it moves outward from the overhang 50Y.
• the energy storage device 10 can fold the overhang 50Y at the end point 90B toward the first surface 41A or the second surface 42A.
• the overhang 50Y can be folded starting from any point between the end point 90B and the starting point 90A.
• the overhanging portion 50Y is folded at a position away from the root 70X, in other words, at a position where damage caused by heat sealing is relatively small, so that the occurrence of cracks in the exterior film 50 at the root 70X is suppressed. From the viewpoint of suppressing the occurrence of cracks in the exterior film 50, it is preferable that the overhanging portion 50Y is folded at a position 0.1 mm or more away from the root 70X.
• a crease 90C is formed in advance at the end point 90B or between the start point 90A and the end point 90B. It is preferable that the crease 90C is formed in the overhanging portion 50Y over almost the entire area in the FB direction. It is preferable that the crease 90C is formed at a position 0.1 mm or more away from the root 70X in the LR direction. From the viewpoint of easily folding the overhanging portion 50Y, it is preferable that the crease 90C is formed by a slit 90CX that does not penetrate the exterior film 50. In another example, the fold 90C may be formed by applying an additional seal to the exterior film 50.
• Manufacturing method of electricity storage device> 7 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, an eighth step, a ninth step, and a tenth step.
• the first step to the tenth step are performed, for example, by a manufacturing apparatus for the power storage device 10.
• the first step to the tenth step are names of the steps in the method for manufacturing the power storage device 10 for the sake of convenience, and do not necessarily refer to the order of the steps. The order of the following steps can be changed as desired.
• the manufacturing device places the lid body 60 (hereinafter referred to as the "lid unit 60Z") with the electrode terminals 30 attached to both ends of the electrode body 20.
• the first step electrically connects the electrode terminals 30 and the electrodes of the electrode body 20.
• the lid body 60 may be connected to the electrode terminals 30 electrically connected to the electrode body 20.
• the second step of step S12 is performed after the first step.
• 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.
• an exterior film 50 with a larger area than the exterior film 50 of the finished electricity storage device 10 is used.
• the third step of step S13 is carried out after the second step.
• the manufacturing device forms a first FB-direction sealed portion 71 having an unsealed portion 71Z in the center.
• the hatched portion in FIG. 8 shows an example of the area where the first FB-direction sealed portion 71 is formed.
• the fourth step of step S14 is performed after the third step.
• the manufacturing device forms the second short side seal portion 82.
• the manufacturing device preferably forms the second short side seal portion 82, for example, so that the seal bar 110 does not contact the film thickness portion 90.
• the manufacturing device preferably forms the second short side seal portion 82 using a seal bar 110X having a seal surface 110XA and a seal surface 110XB.
• the seal surface 110XA is a seal surface shaped along the second seal surface 63B and the third seal surface 63C.
• the seal surface 110XB is a seal surface shaped along the outer contour of the film thickness portion 90.
• the hatched portion in FIG. 9 shows an example of the area where the second short side seal portion 82 is formed.
• the fifth step of step S15 is performed after the fourth step.
• the manufacturing equipment forms the second long side seal portion 81 so that the thickness HA of the film thickness portion 90 is maintained.
• the manufacturing equipment forms the second long side seal portion 81, for example, so that the seal bar 110 does not come into contact with the film thickness portion 90.
• the shaded area in FIG. 10 shows an example of the area where the second long side seal portion 81 is formed.
• the sixth step of step S16 is carried out after the fifth step.
• the manufacturing equipment forms the first LR direction seal portion 72.
• the first LR direction seal portion 72 is formed so as to overlap partially with the first FB direction seal portion 71 in the portion including the root 70X.
• Completion of the sixth step results in a gas pocket 100 having a larger area in a plan view than the protrusion portion 50Y of the finished power storage device 10.
• the hatched portion in FIG. 13 shows an example of the area where the first LR direction seal portion 72 is formed.
• the seventh step of step S17 is performed after the sixth step.
• the manufacturing equipment injects an electrolyte through the opening 100X of the gas pocket 100. After the electrolyte is injected, the edges including the opening 100X are joined.
• the aging step is performed after the seventh step. Gas generated by the aging step is stored in the gas pocket 100. The gas stored in the gas pocket 100 is discharged through an opening formed by cutting a part of the gas pocket 100.
• the eighth step of step S18 is carried out after the seventh step and after the aging step is completed.
• the manufacturing equipment forms the first sealing portion 70.
• the first FB direction seal portion 71 may also be resealed, or the first FB direction seal portion 71 may not be resealed. Note that the shaded area in FIG. 14 shows an example of the area where the first sealing portion 70 is formed.
• the ninth step of step S19 is carried out after the eighth step.
• the manufacturing device cuts the gas pocket 100 so that a protrusion 50Y of a predetermined size is formed.
• the dashed dotted line XA shown in FIG. 14 is an example of a line indicating the position where the gas pocket 100 is cut in the ninth step.
• step S20 The tenth step of step S20 is performed after the ninth step.
• the protruding portion 50Y including the first sealing portion 70 is folded.
• the protruding portion 50Y can be folded at a position away from the base 70X that is damaged by heat sealing in the manufacturing process, so that the base 70X of the exterior film 50 and the portion constituting its periphery are less likely to be damaged. Therefore, the electrode body 20 can be suitably sealed by the exterior body 40.
• the power storage device 200 of the second embodiment differs from the power storage device 10 of the first embodiment in that it includes a lid body 260, but other configurations are similar to those of the power storage device 10 of the first embodiment.
• the following describes the power storage device 10 of the second embodiment, focusing on the differences from the power storage device 10 of the first embodiment.
• Fig. 15 is a cross-sectional view of an electricity storage device 200 according to the second embodiment.
• Fig. 16 is a plan view of a lid 260 provided in the electricity storage device 200 of Fig. 15.
• the lid body 60 in order to increase the strength of the base 70X of the first sealing portion 70 and its surroundings, the lid body 60 has a protrusion 68 that protrudes from the lid seal portion 63.
• the first sealing portion 70 is sealed with the protrusion 68 sandwiched between them.
• the position where the protrusion 68 is formed in the lid seal portion 63 is determined based on the position of the root 70X of the first seal portion 70.
• the root 70X of the first seal portion 70 is located at the boundary 64 of the lid body 60. Therefore, the protrusion 68 is formed at the boundary 64 in the lid seal portion 63.
• the protrusion 68 may be formed on the first seal surface 63A, the second seal surface 63B, the third seal surface 63C, the fourth seal surface 63D, the boundary 65, the boundary 66, or the boundary 67, depending on the position of the root 70X of the first seal portion 70.
• the direction in which the protrusion 68 extends can be selected arbitrarily.
• the protrusion 68 extends along a first direction (in this embodiment, the LR direction).
• the protrusion 68 may extend along a second direction (in this embodiment, the UD direction).
• the protrusion 68 can take a first, second, or third form.
• the first, second, and third forms may be independent of each other, or may be combined with each other to the extent that there is no technical contradiction.
• the protrusion 68 is plate-shaped and has a shape that increases in thickness as it approaches the boundary 64, in other words, a shape that becomes wider as it approaches the boundary 64.
• the protrusion 68 has a sufficient thickness at the base 70X and its periphery, so that when the first sealing portion 70 is formed, the resin that constitutes the protrusion 68 is prevented from flowing to the base 70X and its periphery. This prevents a decrease in the thickness HA of the first sealing portion 70 at the base 70X of the first sealing portion 70 and its periphery.
• the protrusion 68 may be formed integrally with the lid body 60A, or may be formed separately from the lid body 60A and joined to the lid body 60A.
• the melting point of the material constituting the protrusion 68 is equal to or higher than the melting point of the material constituting the lid body 60A. According to the second aspect, since the melting point of the material constituting the protrusion 68 is high, the resin constituting the protrusion 68 is prevented from flowing to the base 70X and its surroundings when forming the first sealing portion 70. Therefore, the thickness HA of the first sealing portion 70 at the base 70X of the first sealing portion 70 and its surroundings is prevented from decreasing.
• the protrusion 68 is formed separately from the lid body 60A and joined to the lid body 60A. The protrusion 68 may be formed integrally with the lid body 60A.
• the shape of the protrusion 68 can be selected arbitrarily.
• the shape of the protrusion 68 may be plate-shaped.
• the thickness of the protrusion 68 can be selected arbitrarily.
• the thickness of the protrusion 68 may increase as it approaches the boundary 64.
• the thickness of the protrusion 68 may be constant or may increase with increasing distance from the boundary 64.
• the length of the protrusion 68 in the LR direction is 20 mm or less. According to the third aspect, since the length of the protrusion 68 is short, the resin constituting the protrusion 68 is prevented from flowing to the base 70X and its surroundings when forming the first sealing portion 70. Therefore, the thickness HA of the first sealing portion 70 at the base 70X of the first sealing portion 70 and its surroundings is prevented from decreasing.
• the protrusion 68 may be formed integrally with the lid body 60A, or may be formed separately from the lid body 60A and joined to the lid body 60A. In the third aspect, the shape of the protrusion 68 can be selected arbitrarily.
• the shape of the protrusion 68 may be plate-shaped.
• the thickness of the protrusion 68 can be selected arbitrarily.
• the thickness of the protrusion 68 may increase as it approaches the boundary 64.
• the thickness of the protrusion 68 may be constant or may increase with increasing distance from the boundary 64.
• the protruding portion 50Y can be folded at a position away from the base 70X that is damaged by heat sealing in the manufacturing process, so that the base 70X of the exterior film 50 and the portion constituting its periphery are less likely to be damaged. Therefore, the electrode body 20 can be suitably sealed by the exterior body 40.
• the above-described embodiments are examples of possible forms of the electricity storage device, the lid, and the method for manufacturing the electricity storage device according to the present invention, and are not intended to limit the forms.
• the electricity storage device, the lid, and the method for manufacturing the electricity storage device according to the present invention may take forms different from those exemplified in the embodiments.
• One example of such a form 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 there is no technical contradiction.
• the configuration of the first sealing portion 70 can be changed as desired, as long as the protruding portion 50Y can be folded at a position away from the base 70X of the first sealing portion 70.
• the thick portion 90 can be omitted from the first sealing portion 70.
• the thickness HA of the first sealing portion 70 may be constant, or the thickness may vary partially.
• the manufacturing method of the electric storage device 10 of the first embodiment can be arbitrarily changed.
• the cooling jig 300 may be arranged on the protruding portion 50Y along the side 43.
• the cooling jig 300 is a jig that suppresses the portion of the first FB direction seal portion 71 including the side 43 from being heat-sealed again in the fourth and fifth steps.
• the cooling jig 300 also has the effect of suppressing the heat of the heat seal from being transmitted to the portion of the first FB direction seal portion 71 including the side 43 when forming the second short side seal portion 82 and the second long side seal portion 81.
• the cooling jig 300 is installed only on the protruding portion 50Y and is not installed on the main body portion 50X.
• the cooling jig 300 may be removed from the intermediate energy storage device 10 (hereinafter referred to as the "intermediate energy storage device 10") in the process of manufacture after the fourth and fifth steps are completed, or may remain attached to the intermediate energy storage device 10.
• FIG. 17 is a perspective view of an intermediate body of the power storage device 10 with the cooling jig 300 attached in the third step.
• FIG. 18 is a perspective view of the cooling jig 300 in FIG. 17.
• the cooling jig 300 is attached to both ends of the protruding portion 50Y in the FB direction of the intermediate body of the power storage device 10.
• the cooling jig 300 may be attached to only one end of the protruding portion 50Y in the FB direction.
• the material constituting the cooling jig 300 can be selected arbitrarily.
• the material constituting the cooling jig 300 is, for example, a resin material, a metal material, a rubber material, a metal oxide, or a carbon material.
• the cooling jig 300 has a first fixing part 310, a second fixing part 320, and a connecting part 330.
• the material constituting the first fixing part 310, the material constituting the second fixing part 320, and the material constituting the connecting part 330 may be the same material or different materials.
• the first fixing part 310, the second fixing part 320, and the connecting part 330 may be formed integrally, or may be formed separately and joined. In this embodiment, the first fixing part 310, the second fixing part 320, and the connecting part 330 are formed integrally, for example, from a resin material.
• the first fixing portion 310 is plate-shaped and is arranged on the first surface 50YA of the overhanging portion 50Y along the side 43.
• the first fixing portion 310 does not straddle the first surface 41A of the exterior body 40.
• the first fixing portion 310 contacts the first surface 50YA of the overhanging portion 50Y.
• the first fixing portion 310 also has the effect of suppressing the overhanging portion 50Y (gas pocket 100) from moving toward the second surface 42A around the side 43.
• At least a part of the first fixing portion 310 may or may not be joined to the first surface 50YA of the overhanging portion 50Y.
• the first fixing portion 310 can be joined to the first surface 50YA of the overhanging portion 50Y by any means, such as an adhesive or heat sealing. In the second modified example, the first fixing portion 310 is not joined to the first surface 50YA of the overhanging portion 50Y.
• the second fixing portion 320 is plate-shaped and is arranged so as to contact the second surface 50YB of the overhang portion 50Y. By supporting the overhang portion 50Y, the second fixing portion 320 also has the effect of suppressing the movement of the overhang portion 50Y (gas pocket 100) around the edge 43 toward the second surface 42A. At least a portion of the second fixing portion 320 may or may not be joined to the second surface 50YB of the overhang portion 50Y.
• the second fixing portion 320 can be joined to the second surface 50YB of the overhang portion 50Y by any means, such as an adhesive or heat sealing. In the second modified example, the second fixing portion 320 is not joined to the second surface 50YB of the overhang portion 50Y.
• the lengths of the first fixing portion 310 and the second fixing portion 320 in the FB direction can be selected arbitrarily. In the example shown in FIG. 17, the length of the first fixing portion 310 is longer than the length of the second fixing portion 320 in the FB direction. The length of the first fixing portion 310 in the FB direction may be shorter than the length of the second fixing portion 320 or may be the same as the length of the second fixing portion 320.
• connection portion 330 connects the first fixing portion 310 and the second fixing portion 320.
• the connection portion 330 may or may not be in contact with the side surface 50YC of the overhang portion 50Y. In the example shown in FIG. 17, the connection portion 330 is in contact with the side surface 50YC of the overhang portion 50Y. At least a portion of the connection portion 330 may or may not be joined to the side surface 50YC of the overhang portion 50Y.
• the connection portion 330 can be joined to the side surface 50YC of the overhang portion 50Y by any means, such as an adhesive or heat sealing. In the second modified example, the connection portion 330 is not joined to the side surface 50YC of the overhang portion 50Y.
• the specific configuration of the cooling jig 300 can be changed as desired as long as the configuration can prevent the portion of the first FB-direction seal portion 71 including the side 43 from being heat-sealed again in at least one of the fourth and fifth steps.
• the first fixing portion 310 or the second fixing portion 320 may be omitted from the cooling jig 300.
• the connecting portion 330 may be omitted from the cooling jig 300.
• the cooling jig 300 is composed of only the first fixing portion 310, it is preferable that the first fixing portion 310 is joined to at least a part of the first surface 50YA of the protruding portion 50Y.
• the second fixing portion 320 is joined to at least a part of the second surface 50YB of the protruding portion 50Y and the second surface 42A of the exterior body 40.
• the cooling jig 300 also has the effect of suppressing peeling of the first sealing portion 70 and the second sealing portion 80 when the internal pressure of the exterior body 40 increases while attached to the completed power storage device 10.
• the exterior body 40 may shrink.
• the cooling jig 300 can suppress the shrinkage of the exterior body 40.
• the cooling jig 300X includes a first fixing portion 310X, a pair of second fixing portions 320X, and a pair of connecting portions 330X.
• the first fixing portion 310X is plate-shaped and extends in the FB direction.
• the length of the first fixing portion 310X in the FB direction is substantially equal to the length of the protruding portion 50Y.
• the pair of second fixing portions 320X are plate-shaped and are connected to the ends of the first fixing portion 310X in the FB direction via a pair of connecting portions 330X.
• the length of the pair of second fixing portions 320X in the FB direction is shorter than the length of the protruding portion 50Y.
• the first fixing portion 310X or the second fixing portion 320X may be omitted from the cooling jig 300X.
• the connecting portions 330X may be omitted from the cooling jig 300X.
• the cooling jig 300 is composed only of the first fixing portion 310X, it is preferable that the first fixing portion 310X is joined to at least a part of the first surface 50YA of the protruding portion 50Y.
• the second fixing portion 320X is joined to the second surface 50YB of the protruding portion 50Y and at least a part of the second surface 42A of the exterior body 40.
• the cooling jig 300X When the cooling jig 300X is attached to the completed power storage device 10, it has the same effect as the cooling jig 300 in suppressing the expansion of the exterior body 40 and suppressing the peeling of the first sealing portion 70 and the second sealing portion 80. When at least a portion of the cooling jig 300X is joined to any surface of the exterior body 40, it has the effect of suppressing the contraction of the exterior body 40. Since the length of the first fixing portion 310X in the FB direction is substantially equal to the length of the protruding portion 50Y, the cooling jig 300X is particularly effective in suppressing the peeling of the first sealing portion 70.
• the cooling jig 300Y includes a first fixing portion 310Y, a second fixing portion 320Y, and a pair of connecting portions 330Y.
• the first fixing portion 310Y is plate-shaped and extends in the FB direction.
• the length of the first fixing portion 310Y in the FB direction is substantially equal to the length of the protruding portion 50Y.
• the second fixing portion 320Y is plate-shaped and extends in the FB direction.
• the length of the second fixing portion 320Y in the FB direction is substantially equal to the length of the protruding portion 50Y.
• the pair of connecting portions 330Y connect the end of the first fixing portion 310Y and the end of the second fixing portion 320Y in the FB direction.
• the cooling jig 300Y may be configured such that the first fixing portion 310Y or the second fixing portion 320Y is omitted.
• the connecting portion 330Y may be omitted from the cooling jig 300Y.
• the cooling jig 300Y is composed of only the first fixing portion 310Y, it is preferable that the first fixing portion 310Y is joined to at least a part of the first surface 50YA of the protruding portion 50Y.
• the second fixing portion 320Y is joined to the second surface 50YB of the protruding portion 50Y and at least a part of the second surface 42A of the exterior body 40.
• the cooling jig 300Y When the cooling jig 300Y is attached to the completed power storage device 10, it has the same effect as the cooling jig 300 in suppressing the expansion of the exterior body 40 and suppressing the peeling of the first sealing portion 70 and the second sealing portion 80.
• the cooling jig 300Y When at least a portion of the cooling jig 300Y is joined to any surface of the exterior body 40, it has the effect of suppressing the contraction of the exterior body 40. Since the cooling jig 300Y sandwiches the first sealing portion 70 between the first fixing portion 310Y and the second fixing portion 320Y, it is particularly effective in suppressing the peeling of the first sealing portion 70. Furthermore, the larger the contact area between the connection portion 330Y and the second surface 42A, the more effectively the cooling jig 300Y can suppress the expansion of the second surface 42A.
• the direction in which the protrusion 68 extends can be changed arbitrarily.
• the protrusion 68 may extend in a third direction intersecting the first direction (LR direction in the second embodiment) and the second direction (UD direction in the second embodiment) in a front view of the lid body 260.
• the configuration of the lid body 260 can be changed arbitrarily.
• the lid body 260 may include a frame 60B that covers the lid body 60A.
• the material constituting the lid body 60A can be any material such as metal or resin.
• the material constituting the frame 60B is, for example, a resin that can be suitably sealed with the heat-sealable resin layer 53 of the exterior film 50.
• the lid seal portion 63 and the protrusion 68 of the lid body 60 are formed in the frame 60B.
• the specific method of forming the protrusion 68 of the lid body 260 can be changed as desired.
• the protrusion 68 may be formed by an adhesive film or the like that is bonded to the lid seal portion 63 of the lid main body 60A.
• the protrusion 68 may be formed by bonding a plurality of adhesive films to the lid seal portion 63 in an overlapping manner, or the protrusion 68 may be formed by bonding an adhesive film to the lid seal portion 63 in a flap shape.
• the power storage device 10 of the first embodiment may have an adhesive film disposed between the exterior film 50 and the lid body 60 in order to favorably bond the exterior film 50 and the lid body 60.
• the lid body 60 with the adhesive film attached thereto is attached to the openings 40A at both ends of the exterior body 40, and then the second sealing portion 80 is formed.
• the adhesive film is wrapped around the lid body 60 so as to cover the entire surface of the lid seal portion 63 of the lid body 60. It is preferable that the adhesive film is configured to be wider than the lid seal portion 63 of the lid body 60 as a whole. In this case, the adhesive film can be easily bonded to the lid body 60. Furthermore, since the boundaries 64 to 67 of the lid seal portion 63 are covered by the adhesive film, the adhesion between the lid body 60 and the adhesive film is enhanced.
• the adhesive film can be selected arbitrarily as long as it can bond the exterior film 50 and the lid 60.
• the adhesive film is preferably a laminate (laminate film) having at least a heat-sealable resin layer, a heat-resistant base 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 60.
• the material constituting the heat-sealable resin layer of the adhesive film on the side to be bonded to the lid 60 is preferably an acid-modified polyolefin resin graft-modified with an acid such as maleic anhydride.
• the acid-modified polyolefin is not particularly limited as long as it is an acid-modified polyolefin, but preferably includes polyolefins graft-modified with an unsaturated carboxylic acid or its anhydride.
• polyolefins to be modified with an acid include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; crystalline or amorphous 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); and ethylene-butene-propylene terpolymers.
• polyethylene and polypropylene are preferred, and polypropylene is particularly preferred.
• the polyolefin to be acid-modified may also be a cyclic polyolefin.
• a carboxylic acid-modified cyclic polyolefin is a polymer obtained by copolymerizing a portion of the monomers constituting the cyclic polyolefin with an ⁇ , ⁇ -unsaturated carboxylic acid or its anhydride, or by block polymerizing or graft polymerizing an ⁇ , ⁇ -unsaturated carboxylic acid or its anhydride onto a cyclic polyolefin.
• the acid-modified cyclic polyolefin is a copolymer of an olefin and a cyclic monomer.
• the olefins constituting the cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, butadiene, and isoprene.
• the cyclic monomers constituting the cyclic polyolefin include cyclic alkenes such as norbornene; specifically, cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, and norbornadiene.
• cyclic alkenes are preferred, and norbornene is even more preferred.
• Styrene is also an example of a constituting monomer.
• carboxylic acids or anhydrides thereof used for acid modification include maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, and itaconic anhydride.
• the heat-sealable resin layer on the side of the adhesive film that is bonded to the exterior film 50 is made of the same material as the material constituting the heat-sealable resin layer 53 of the exterior film 50.
• the heat-resistant substrate layer may be 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 because it is inexpensive and strong.
• the heat-resistant substrate layer may be a heat-resistant film or nonwoven fabric.
• Materials constituting the heat-resistant substrate layer include, for example, polyolefin resins, polyamide resins, polyester resins, epoxy resins, acrylic resins, fluororesins, silicone resins, phenolic resins, polyetherimides, polyimides, polycarbonates, and mixtures or copolymers thereof.
• the heat-resistant substrate layer may have the same layer structure as the heat-sealable resin layer.
• the adhesive film preferably has adhesiveness.
• the adhesive film is unlikely 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. This modified example can also be applied to the second embodiment.
• 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 inward so that the outer surfaces of the exterior film 50 come into contact with each other, as in a Goebel-top container, or may be folded toward any surface of the exterior body 40, as in a brick container.
• the exterior body 40 may not have one of the two lid bodies 60.
• the electrode body 20 in 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 Goebel-top container or a brick container, as in the seventh modification.
• the outer shape of the exterior body 40 can be changed as desired.
• the outer shape of the exterior body 40 may be a cylinder, a prism, or a cube.
• the electrode body 20 is wrapped by one exterior film 50 , but it may be wrapped by two or more exterior films 50 .
• the energy storage devices of Examples 1 to 8 are energy storage devices related to the second embodiment.
• the energy storage devices of Examples 1 to 8 are intermediate products of energy storage devices in which up to the fifth step of the manufacturing method for the energy storage device 10 has been completed.
• the intermediate products of the energy storage devices of Examples 1 to 8 will be referred to as energy storage devices below.
• the specifications of the energy storage devices of Examples 1 to 8 are as follows.
• the exterior film 50 is a laminate (laminate film) having a base layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order.
• the base layer 51 is a laminate of a polyethylene terephthalate film, an adhesive layer, an oriented nylon film, and an adhesive layer, laminated in this order.
• the polyethylene terephthalate film has a thickness of 15 ⁇ m.
• the oriented nylon film has a thickness of 15 ⁇ m.
• the adhesive layers are both made of two-liquid urethane adhesives.
• the adhesive layer has a thickness of 3 ⁇ m after curing.
• the barrier layer 52 is made of aluminum foil.
• the barrier layer 52 has a thickness of 40 ⁇ m.
• the heat-sealable resin layer 53 in Examples 1 and 2 is a laminate of maleic anhydride-modified polypropylene and random polypropylene, laminated in this order.
• the maleic anhydride-modified polypropylene has a thickness of 40 ⁇ m.
• the random polypropylene has a thickness of 40 ⁇ m.
• the material that constitutes the lid body 60 is polypropylene, and it is manufactured by injection molding.
• the length (height) of the lid body 60 in the UD direction is 30 mm
• the length (width) in the LR direction is 100 mm
• the length (thickness) in the FB direction is 5 mm.
• the protrusion 68 of the lid body 60 is formed at the boundary 64 in the lid seal portion 63.
• the length of the protrusion 68 in the LR direction is 5 mm
• the length in the FB direction is 2 mm
• the length in the UD direction is 0.2 mm.
• the thickness of the protrusion 68 in the UD direction is roughly constant.
• the manufacturing method of the electric storage device of Examples 1 to 8 is the same as the method shown in FIG. 7.
• the sealing conditions when forming the first FB direction seal portion 71 in the third step are a temperature of 226°C, a sealing time of 10 seconds, and a surface pressure of 0.25 MPa.
• the sealing conditions when forming the second sealing portion 80 in the fourth and fifth steps are a temperature of 180°C, a sealing time of 5 seconds, and a surface pressure of 0.78 MPa.
• the sealing conditions such as temperature, pressure, and time can be appropriately changed depending on the material and equipment.
• the overhanging portion 50Y is folded starting from a position away from the root 70X (side 43) of the first sealing portion 70.
• the electric storage devices of Examples 1 to 4 are different in the number of times that the overhanging portion 50Y is folded, which will be described later.
• the electric storage devices of Examples 5 to 8 are different in the number of times that the overhanging portion 50Y is folded, which will be described later.
• the energy storage devices of Comparative Examples 1 to 4 have the same configuration as the energy storage device 10 of the second embodiment, except that the protruding portion 50Y is folded starting from the base 70X (side 43) of the first sealing portion 70.
• the energy storage devices of Comparative Examples 1 to 4 are intermediate bodies of energy storage devices in which the fifth step of the manufacturing method for the energy storage device 10 has been completed.
• the intermediate bodies of the energy storage devices of Comparative Examples 1 to 4 will be referred to as energy storage devices below.
• the specifications of the energy storage devices of Comparative Examples 1 to 4 are as follows:
• the specifications of the exterior film 50 and the lid 60 are the same as those of the energy storage devices of Examples 1 to 8.
• the manufacturing method of the energy storage devices of Comparative Examples 1 to 4 is the same as that of the energy storage devices of Examples 1 to 8.
• the protruding portion 50Y is folded starting from the base 70X (side 43) of the first sealing portion 70, so no additional sealing is performed after the fifth step.
• the folding operation was performed once for the energy storage devices of Example 1, Example 5, and Comparative Example 1.
• the folding operation was performed twice for the energy storage devices of Example 2, Example 6, and Comparative Example 2.
• the folding operation was performed three times for the energy storage devices of Example 3, Example 7, and Comparative Example 3.
• the folding operation was performed four times for the energy storage devices of Example 4, Example 8, and Comparative Example 4.
• the exterior bodies of the power storage devices of Examples 1 to 8 and Comparative Examples 1 to 4 were cut out using an ultrasonic cutter (e.g., SUW30 (manufactured by Suzuki Corporation)) and scissors before and after the folding operation.
• the inner surface of the exterior body 40 was cut using a retratome (e.g., REM-710).
• the cross section was observed using a laser microscope (e.g., ultra-deep color 3D shape measuring microscope VK-9510) to confirm the presence or absence of peeling between the barrier layer 52 and the heat-sealable resin layer 53, and the presence or absence of cracks in the heat-sealable resin layer 53.
• FIG. 23 is a table showing the test results.
• the presence or absence of peeling between the barrier layer 52 and the heat-sealable resin layer 53 is noted as “presence or absence of peeling.”
• the presence or absence of cracks in the heat-sealable resin layer 53 is noted as “presence or absence of cracks.”
• no peeling between the barrier layer 52 and the heat-sealable resin layer 53 and no cracks in the heat-sealable resin layer 53 were observed before and after the folding operation. This shows that the electricity storage devices of Examples 1 to 8 have high sealing properties.
• Electrode body 40 Exterior body 40A: Opening 50: Exterior film 50Y: Protruding portion 60: Lid body 60Z: Lid unit 260: Lid body 63: Lid seal portion 68: Protruding portion 70: First sealing portion 70X: Base 80: Second sealing portion 90: Film thickness portion 90A: Starting point 90B: Ending point 90C: Fold 90D: Slit

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