Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/148—Lids or covers characterised by their shape
• • 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
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/105—Pouches or flexible bags
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes 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
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
  • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
  • H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
• • 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 protective member for the 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 all-solid-state battery stack, electrode terminals, and an exterior body that seals the all-solid-state battery stack.
• the exterior body includes a film strip member that is wrapped around the all-solid-state battery stack to have an opening, and a lid body that is placed on the opening.
• the electrode terminals are electrically connected to the all-solid-state battery stack.
• Patent Document 1 In an electricity storage device such as that described in Patent Document 1, a film strip is wrapped around the side surface, including the ridges, of the all-solid-state battery stack.
• film strips are prone to breakage at the corners and ridges of the three-dimensional shape of the all-solid-state battery stack, reducing the durability of the electricity storage device.
• This is not limited to all-solid-state battery stacks, but applies generally to cases in which an electrode body having a three-dimensional shape including corners and ridges is wrapped in an exterior film. Patent Document 1 does not take this point into consideration.
• the present invention aims to provide an electricity storage device with improved durability.
• the energy storage device comprises an electrode body having a three-dimensional shape including a ridge line portion, an exterior film that covers at least one of the ridge lines and encases the electrode body, and a protective member that is disposed on the outside of the electrode body along at least one of the ridge lines.
• the electricity storage device is the electricity storage device according to the first aspect, in which the protective member is disposed on the outside of the exterior film.
• the electricity storage device is the electricity storage device according to the first or second aspect, in which the protective member is disposed inside the exterior film.
• the electric storage device is an electric storage device according to any one of the first to third aspects, in which the exterior film encases the electrode body so as to have an opening, and the electric storage device further includes a lid body that is placed in the opening.
• the protective member according to the sixth aspect of the present invention is a protective member for an electricity storage device, the electricity storage device comprising an electrode body having a three-dimensional shape including a ridge line portion, and an exterior film that covers at least one of the ridge lines and encases the electrode body.
• the protective member is disposed on the outside of the electrode body along at least one of the ridge lines.
• the present invention provides an electricity storage device with improved durability.
• FIG. 1 is a perspective view of an electricity storage device according to a first embodiment.
• FIG. 2 is a perspective view of the electrode body of FIG. 2 is a cross-sectional view showing a layer structure of an exterior film included in the electricity storage device of FIG. 1 .
• FIG. 4 is a perspective view showing a schematic configuration of a lid body.
• FIG. 4 is a perspective view showing a schematic configuration of a protective member.
• FIG. 11 is a perspective view of an electricity storage device according to a second embodiment.
• FIG. 11 is a perspective view showing a partial configuration of a protection member according to a second embodiment.
• FIG. 13 is a perspective view of an electricity storage device according to a third embodiment.
• FIG. 11 is a perspective view of a protection member and an electrode body according to a third embodiment.
• FIG. 13 is a perspective view of a protection member and an electrode body according to a fourth embodiment.
• FIG. 4 is a diagram showing an example of a usage state of the power storage device
• the power storage device according to some embodiments of the present invention.
• the same or corresponding parts in the drawings are given the same reference numerals, and the description thereof will not be repeated.
• the drawings do not necessarily reflect the actual dimensions of each member.
• the numerical range indicated by “ ⁇ ” means “greater than or equal to” or “less than or equal to”.
• the notation 2 to 15 mm means 2 mm or more and 15 mm or less.
• the upper limit or lower limit value described in a certain numerical range may be replaced with the upper limit or lower limit value of another numerical range described in stages.
• the upper limit value and the upper limit value, the upper limit value and the lower limit value, or the lower limit value and the lower limit value described separately may be combined to form a numerical range.
• Fig. 1 is a perspective view that typically illustrates an electricity storage device 10 according to a first embodiment.
• the electricity storage device 10 includes an electrode body 20, a pair of electrode terminals 30, an exterior body 40, and protective members 90 and 91.
• the direction of the arrow UD indicates the thickness direction of the electricity storage device 10
• the direction of the arrow LR indicates the width direction of the electricity storage device 10
• the direction of the arrow FB indicates the depth direction of the electricity storage device 10.
• the directions indicated by the arrows UD, LR, and FB are the same in the subsequent figures.
• FIG. 2 is a side view showing a schematic configuration of the electrode body 20.
• the electrode body 20 includes, for example, a lithium ion battery, a capacitor, or an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, a polyvalent cation battery, or an electrode (positive electrode and negative electrode) constituting a storage member such as a capacitor, and a separator, etc.
• a lithium ion battery a capacitor, or an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery
• the electrode body 20 has an approximately rectangular parallelepiped shape.
• approximately rectangular parallelepiped includes, for example, a solid that can be regarded as a rectangular parallelepiped by modifying the shape of a part of the outer surface.
• the electrode body 20 may have a three-dimensional shape including multiple corners, such as an approximately polygonal prism, or may have an approximately cylindrical shape.
• the electrode body 20 has a front surface 21, a back surface 22, an upper surface 23, a lower surface 24, a first side surface 25, and a second side surface 26.
• the upper surface 23 and the lower surface 24 respectively coincide with the upper surface and the lower surface in the laminated structure of the electrode body 20.
• the front surface 21, the back surface 22, the first side surface 25, and the second side surface 26 are imaginary surfaces when the electrode body 20 is regarded as a substantially rectangular parallelepiped, based on the upper surface 23 and the lower surface 24.
• the front surface 21 faces one of the lid bodies 60.
• the back surface 22 faces the other lid body 60.
• the upper surface 23 constitutes the first surface 41 of the exterior body 40 described later.
• the lower surface 24 constitutes the third surface 43 of the exterior body 40 described later.
• the first side surface 25 constitutes the second surface 42 of the exterior body 40 described later.
• the second side surface 26 constitutes a fourth surface 44 of the exterior body 40, which will be described later.
• each of the surfaces 23 to 26 of the electrode body 20 may constitute any of the first surface 41 to the fourth surface 44 of the exterior body 40.
• the electrode body 20 has a ridge portion 20A, a ridge portion 20B, a ridge portion 20C, and a ridge portion 20D.
• the ridge portion 20A is formed at the boundary between the upper surface 23 and the first side surface 25.
• the ridge portion 20B is formed at the boundary between the upper surface 23 and the second side surface 26.
• the ridge portion 20C is formed at the boundary between the first side surface 25 and the lower surface 24.
• the ridge portion 20D is formed at the boundary between the second side surface 26 and the lower surface 24.
• a ridge portion refers to a boundary between two surfaces that intersect with each other.
• the ends of each of the ridge portions 20A to 20D become corner portions 230 that correspond to the vertices of a substantially rectangular parallelepiped.
• the outermost layer of the electrode body 20 does not necessarily have to be an electrode, but 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.
• wrapping the electrode body 20 with the exterior film 50 is not limited to wrapping the exterior film 50, and the electrode body 20 may be disposed inside the exterior film 50 that has been formed in a cylindrical shape in advance.
• the exterior film 50 covers the front surface 21, the back surface 22, the upper surface 23, the lower surface 24, the first side surface 25, the second side surface 26, the ridge portions 20A to 20D, and the corner portions 230 of the electrode body 20, and the first surface 41 to the fourth surface 44 described later are formed in the exterior body 40.
• the exterior film 50 has a protruding portion 50X that protrudes outward from the portion encasing the electrode body 20 when the exterior film 50 encases the electrode body 20.
• the pair of lid bodies 60 are respectively disposed on the sides of the electrode body 20 so as to close the pair of openings 40A.
• a storage section for example, there is a method of forming a storage section (recess) in the exterior film 50 through cold forming to accommodate the electrode body 20.
• the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20.
• the exterior film 50 is wrapped 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.
• FIG. 3 is a cross-sectional view showing the layer structure of the exterior film 50.
• the exterior film 50 is a laminate (laminate film) having, for example, a base layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order.
• the exterior film 50 does not need to include all of these layers, and for example, the barrier layer 52 may not be included.
• the exterior film 50 may be made of a material that is flexible and easily bendable, and may be made of, for example, a resin film.
• the exterior film 50 is preferably heat-sealable.
• the substrate layer 51 included in the exterior film 50 is a layer for imparting heat resistance to the exterior film 50 and suppressing the occurrence of pinholes that may occur during processing or distribution.
• the substrate layer 51 is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer.
• the barrier layer 52 can be protected during processing of the exterior film 50 and breakage of the exterior film 50 can be suppressed.
• the stretched polyester resin layer is preferably a biaxially stretched polyester resin layer
• the stretched polyamide resin layer is preferably a biaxially stretched polyamide resin layer.
• the stretched polyester resin layer is more preferably a biaxially stretched polyethylene terephthalate (PET) film
• the stretched polyamide resin layer is more preferably a biaxially stretched nylon (ONy) film.
• the substrate layer 51 may be composed of both a stretched polyester resin layer and a stretched polyamide resin layer. From the standpoint of film strength, the thickness of the base layer 51 is preferably, for example, 5 to 300 ⁇ m, and more preferably 20 to 150 ⁇ m.
• the barrier layer 52 is a layer that at least prevents the intrusion of moisture.
• the barrier layer 52 is bonded to the base layer 51 via, for example, an adhesive layer 54.
• Examples of the barrier layer 52 include metal foil, vapor deposition film, and resin layer having barrier properties.
• the vapor deposition film examples include metal vapor deposition film, inorganic oxide vapor deposition film, and carbon-containing inorganic oxide vapor deposition film
• the resin layer examples include fluorine-containing resins such as polyvinylidene chloride, polymers mainly composed of chlorotrifluoroethylene (CTFE), polymers mainly composed of tetrafluoroethylene (TFE), polymers having fluoroalkyl groups, and polymers mainly composed of fluoroalkyl units, and ethylene-vinyl alcohol copolymers.
• CTFE chlorotrifluoroethylene
• TFE tetrafluoroethylene
• the barrier layer 52 examples include resin films having at least one layer of these vapor deposition films and resin layers. The barrier layer 52 may be provided in multiple layers.
• the barrier layer 52 includes a layer composed of a metal material.
• metal materials constituting the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates.
• metal foil it is preferable to use at least one of aluminum alloy foil and stainless steel foil.
• the layer made of the above-mentioned metal material may contain recycled metal material.
• recycled metal material include recycled aluminum alloy, stainless steel, titanium steel, or steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloy can be obtained by the manufacturing method described in WO 2022/092231.
• the barrier layer 52 may be made of only recycled material, or may be made of a mixture of recycled and virgin materials. Note that recycled metal material refers to metal material that has been made reusable by collecting, isolating, and refining various products used in the city and waste from manufacturing processes. Also, virgin metal material refers to new metal material that has been refined from natural metal resources (raw materials) and is not recycled material.
• the aluminum alloy foil is preferably a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of further improving the formability or conformability, it is preferable that the aluminum alloy foil is an iron-containing aluminum alloy foil.
• the iron-containing aluminum alloy foil (100% by mass) the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass.
• an exterior film 50 having better formability can be obtained.
• an exterior film 50 having better flexibility can be obtained.
• the soft aluminum alloy foil examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, etc. may be added as necessary.
• the softening can be performed by annealing or the like. From the viewpoint of improving the mechanical strength of the exterior film 50, it is more preferable that the aluminum alloy foil is a hard aluminum alloy foil composed of, for example, a work-hardened aluminum alloy.
• hard aluminum alloy foils examples include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-H18, JIS H4160:1994 A8079H-H18, JIS H4000:2014 A8021P-H14, or JIS H4000:2014 A8079P-H14.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. Furthermore, from the viewpoint of providing an exterior film 50 with excellent formability, it is preferable that the stainless steel foil is made of austenitic stainless steel.
• austenitic stainless steels that make up the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.
• the thickness of the barrier layer 52 should be such that it at least functions as a barrier layer to prevent the penetration of moisture, and may be, for example, about 5 to 200 ⁇ m.
• the thickness of the barrier layer 52 is preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, and particularly preferably about 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably about 9.0 ⁇ m or more, more preferably about 20 ⁇ m or more, and more preferably about 25 ⁇ m or more.
• Preferred ranges of the thickness of the barrier layer 52 include about 9.0 to 85 ⁇ m, about 9.0 to 50 ⁇ m, about 9.0 to 40 ⁇ m, about 9.0 to 35 ⁇ m, about 20 to 85 ⁇ m, about 20 to 50 ⁇ m, about 20 to 40 ⁇ m, about 20 to 35 ⁇ m, about 25 to 85 ⁇ m, about 25 to 50 ⁇ m, about 25 to 40 ⁇ m, and about 25 to 35 ⁇ m.
• the barrier layer 52 is made of an aluminum alloy foil, the above-mentioned ranges are particularly preferred.
• the thickness of the barrier layer 52 is preferably about 35 ⁇ m or more, more preferably about 45 ⁇ m or more, even more preferably about 50 ⁇ m or more, and even more preferably about 55 ⁇ m or more, and is preferably about 200 ⁇ m or less, more preferably about 85 ⁇ m or less, even more preferably about 75 ⁇ m or less, and even more preferably about 70 ⁇ m or less.
• the preferable ranges are about 35 to 200 ⁇ m, about 35 to 85 ⁇ m, about 35 to 75 ⁇ m, about 35 to 70 ⁇ m, about 45 to 200 ⁇ m, about 45 to 85 ⁇ m, about 45 to 75 ⁇ m, about 45 to 70 ⁇ m, about 50 to 200 ⁇ m, about 50 to 85 ⁇ m, about 50 to 75 ⁇ m, about 50 to 70 ⁇ m, about 55 to 200 ⁇ m, about 55 to 85 ⁇ m, about 55 to 75 ⁇ m, and about 55 to 70 ⁇ m.
• the exterior film 50 has high formability, which makes deep drawing easy and can contribute to increasing the capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, even more preferably about 30 ⁇ m or less, and particularly preferably about 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more.
• Preferred ranges for the thickness of the stainless steel foil include about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, and about 15 to 25 ⁇ m.
• the barrier layer 52 when the barrier layer 52 is a metal foil, it is preferable that at least the surface opposite to the base layer 51 is provided with a corrosion-resistant film in order to prevent dissolution and corrosion.
• the barrier layer 52 may be provided with a corrosion-resistant film on both sides.
• the corrosion-resistant film refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the barrier layer 52 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment with nickel or chromium, or corrosion prevention treatment by applying a coating agent on the surface of the barrier layer 52.
• the corrosion-resistant film means a film that improves the acid resistance of the barrier layer 52 (acid-resistant film), a film that improves the alkali resistance of the barrier layer 52 (alkali-resistant film), etc.
• the treatment for forming the corrosion-resistant film may be one type, or two or more types may be combined. In addition, it is possible to form not only one layer but also multiple layers. Furthermore, among these treatments, hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved by a treatment agent to form metal compounds with excellent corrosion resistance. Note that these treatments may also be included in the definition of chemical conversion treatment. Also, if the barrier layer 52 has a corrosion-resistant coating, the corrosion-resistant coating is also included in the barrier layer 52.
• the corrosion-resistant coating prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the base layer 51 during molding of the exterior film 50, prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by the reaction between the electrolyte and moisture, and in particular prevents dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 52 when the barrier layer 52 is an aluminum alloy foil, and improves the adhesion (wettability) of the surface of the barrier layer 52, preventing delamination between the base layer 51 and the barrier layer 52 during heat sealing and between the base layer 51 and the barrier layer 52 during molding.
• the barrier layer 52 e.g., aluminum alloy foil
• the heat-sealable resin layer 53 is bonded to the barrier layer 52, for example, via an adhesive layer 55.
• the heat-sealable resin layer 53 included in the exterior film 50 is a layer that provides the exterior film 50 with heat-sealing sealability.
• Examples of the heat-sealable resin layer 53 include resin films made of polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, cyclic polyolefin resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the standpoint of sealability and strength, the thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 ⁇ m, and more preferably 40 to 150 ⁇ m.
• the exterior film 50 has one or more layers with a buffer function (hereinafter referred to as "buffer layers") outside the heat-sealable resin layer 53, and more preferably outside the barrier layer 52.
• the buffer layer may be laminated on the outside of the base layer 51, or the base layer 51 may also function as a buffer layer.
• the multiple buffer layers may be adjacent to each other, or may be laminated via the base layer 51, the barrier layer 52, etc.
• the material constituting the buffer layer can be selected from any material having cushioning properties.
• the material having cushioning properties is, for example, rubber, nonwoven fabric, or foam sheet.
• the rubber is, for example, natural rubber, fluororubber, or silicone rubber.
• the rubber hardness is preferably about 20 to 90.
• the material constituting the nonwoven fabric is preferably a material having excellent heat resistance.
• the lower limit of the thickness of the buffer layer is preferably 100 ⁇ m, more preferably 200 ⁇ m, and even more preferably 1000 ⁇ m.
• the upper limit of the thickness of the buffer layer is preferably 5000 ⁇ m, and even more preferably 3000 ⁇ m.
• the preferred range of thickness of the buffer layer is 100 ⁇ m to 5000 ⁇ m, 100 ⁇ m to 3000 ⁇ m, 200 ⁇ m to 5000 ⁇ m, 200 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 5000 ⁇ m, or 1000 ⁇ m to 3000 ⁇ m.
• the most preferred range of thickness of the buffer layer is 1000 ⁇ m to 3000 ⁇ m.
• the lower limit of the thickness of the buffer layer is preferably 0.5 mm.
• the upper limit of the thickness of the buffer layer is preferably 10 mm, more preferably 5 mm, and even more preferably 2 mm.
• the preferred range of the thickness of the buffer layer is 0.5 mm to 10 mm, 0.5 mm to 5 mm, or 0.5 mm to 2 mm.
• the buffer layer functions as a cushion, preventing the exterior film 50 from being damaged by impact when the energy storage device 10 is dropped or by handling during the manufacture of the energy storage device 10.
• the first sealing portion 70 is formed by heat sealing the mutually facing surfaces (thermally adhesive resin layer 53) of the exterior film 50 wrapped around the electrode body 20 and the lid body 60 (see FIG. 1).
• the first sealing portion 70 extends in the longitudinal direction (FB direction) of the exterior body 40.
• the position at which the first sealing portion 70 is formed in the exterior body 40 can be selected arbitrarily.
• the root 70X of the first sealing portion 70 is located on the edge 45 at the boundary between the first surface 41 and the second surface 42 of the exterior body 40.
• the first surface 41 has a larger area than the second surface 42.
• the root 70X of the first sealing portion 70 may be located on any surface of the exterior body 40.
• the first sealing portion 70 is folded, for example, toward the second surface 42 of the exterior body 40.
• the first sealing portion 70 may protrude outward beyond the electrode body 20, or may be folded toward the first surface 41.
• the surface facing the first surface 41 is the third surface 43
• the surface facing the second surface is the fourth surface 44.
• the first surface 41 to the fourth surface 44 are surfaces that correspond to the upper surface 23, first side surface 25, lower surface 24, and second side surface 26 of the electrode body, respectively.
• [Lid] 4 is a perspective view showing a schematic configuration of the lid body 60.
• the lid body 60 is a member arranged to close the opening 40A, and is, for example, a plate having a polygonal shape when viewed from the FB direction of the power storage device 10.
• the lid body 60 is, for example, made of resin.
• the lid body 60 may be formed by, for example, cold forming the exterior film 50.
• the lid body 60 may be a metal molded product.
• the material constituting the lid body 60 may include at least one of metal, metal oxide, carbon fiber reinforced plastic, and rubber.
• the lid body 60 has a first surface 61, a second surface 62, and a lid seal portion 63.
• the first surface 61 faces the electrode body 20.
• the second surface 62 is the surface opposite the first surface 61.
• the lid seal portion 63 is connected to the first surface 61 and the second surface 62, and is heat-sealed to the heat-sealable resin layer 53 of the exterior film 50 to form the second sealing portion 80.
• 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 surface 62 which is the surface facing outward in the energy storage device 10, is the front surface 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) that intersects with the first direction in a front view of the lid body 60.
• the first direction and the second direction are perpendicular to each other in a front view of the lid body 60.
• the first direction and the second direction do not have to be perpendicular to each other when viewed from the front of the lid 60.
• the fourth seal surface 63D forms the lower surface of the lid 60.
• the fourth seal surface 63D extends in the first direction (the LR direction in this embodiment) when viewed from the front of the lid 60.
• the lid body 60 When the lid body 60 is plate-shaped, it is preferable that the lid body 60 has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged on top of each other. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the lid seal portion 63 of the lid body 60 has a certain degree of thickness so that the lid seal portion 63 of the lid body 60 and the exterior film 50 can be suitably heat-sealed when forming the second sealing portion 80.
• the minimum value of the thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the maximum value of the thickness of the lid body 60 is, for example, 20 mm, more preferably 15 mm, and even more preferably 12 mm.
• the preferred ranges for the thickness of the material constituting the lid body 60 are 1.0 mm to 20 mm, 1.0 mm to 15 mm, 1.0 mm to 12 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 12 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, and 4.0 mm to 12 mm.
• the lid body 60 when the lid body 60 is described as being plate-shaped, this does not include a case in which the lid body 60 is composed only of a film as defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard.
• the thickness of the lid body 60 may vary depending on the part of the lid body 60. When the thickness of the lid body 60 varies depending on the part, the thickness of the lid body 60 is the thickness of the thickest part.
• the lid seal portion 63 further includes boundaries 64, 65, 66, and 67.
• Boundary 64 is the boundary between the first seal surface 63A and the second seal surface 63B.
• Boundary 65 is the boundary between the first seal surface 63A and the third seal surface 63C.
• Boundary 66 is the boundary between the fourth seal surface 63D and the second seal surface 63B.
• Boundary 67 is the boundary between the fourth seal surface 63D and the third seal surface 63C.
• 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.
• 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 is the same.
• the main material of the material constituting the lid body 60 and the material constituting the heat-sealable resin layer 53 is polypropylene.
• the main material refers to a material that, for example, occupies 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more when the total material contained in the constituent elements is taken as 100% by mass.
• the lid body 60 is formed with a through hole 60X into which the electrode terminal 30 described later is inserted.
• the through hole 60X penetrates the first surface 61 and the second surface 62.
• the electrode terminal 30 protrudes to the outside of the exterior body 40 through the through hole 60X formed in the lid body 60.
• a small gap between the through hole 60X of the lid body 60 and the electrode terminal 30 is filled with, for example, resin.
• the position at which the electrode terminal 30 protrudes to the outside can be selected arbitrarily.
• the electrode terminal 30 may protrude to the outside from a hole formed in any one of the six surfaces of the exterior body 40.
• a small gap between the exterior body 40 and the electrode terminal 30 is filled with, for example, resin.
• the lid body 60 and the electrode terminal 30 are provided as separate bodies, but the lid body 60 and the electrode terminal 30 may be formed integrally. If the electrode terminal 30 does not protrude from the edge of the exterior body 40, the through hole 60X does not need to be formed in the lid body 60.
• the power storage device 10 includes a pair of electrode terminals 30.
• the electrode terminals 30 are metal terminals used for inputting and outputting electric power in the electrode body 20.
• One end of the electrode terminal 30 is electrically connected to the electrode body 20 (positive electrode or negative electrode).
• the other end of the electrode terminal 30 protrudes outward from an edge of the exterior body 40, for example.
• the electrode terminal 30 may not protrude from the exterior body 40, for example, as long as it is capable of inputting and outputting electric power to and from the electrode body 20.
• the lid body 60 described later is made of, for example, a metal
• the lid body 60 may also function as the electrode terminal 30.
• the lid body 60 having the function as an electrode terminal may or may not protrude from the exterior body 40.
• the metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, copper, etc.
• the electrode terminal 30 connected to the current collector tab, which is the positive electrode is usually made of aluminum, etc.
• the electrode terminal 30 connected to the current collector tab 210, which is the negative electrode is usually made of copper, nickel, etc.
• the power storage device 10 further includes a protective member 90 and a protective member 91.
• the protective member 90 and the protective member 91 are arranged on the outside of the corner portion 230 and the ridge portions 20A to 20D of the electrode body 20 so as to cover the corner portion 230 and the ridge portions 20A to 20D, respectively.
• the protective member 90 and the protective member 91 are arranged on the outside of the exterior body 40, and are joined to the outermost layer of the exterior film 50 or the lid body 60.
• FIG. 5 is a perspective view showing the configuration of the protective member 90.
• the protective member 90 is a member arranged on the outside of the ridge portions 20B to 20D including the corner portion 230 of the electrode body 20.
• the protective member 90 extends in the FB direction and has an L-shape when viewed from the FB direction.
• the protective member 90 has a first surface portion 900 and a second surface portion 901 intersecting with the first surface portion 900.
• one of the three protective members 90 is arranged to straddle the second surface 42 and the third surface 43 of the exterior body 40, another protective member 90 is arranged to straddle the third surface 43 and the fourth surface 44, and yet another protective member 90 is arranged to straddle the first surface 41 and the fourth surface 44.
• the protective member 90 strengthens the portions of the exterior body 40 that correspond to the ridge portions 20B to 20C of the electrode body 20.
• the protective member 90 may simply be a plate-like member that does not have an L-shape, and after being joined to the exterior body 40, it may have the shape shown in FIG. 5.
• the protective member 91 is a member disposed on the outside of the ridge portion 20A of the electrode body 20.
• the protective member 91 extends in the FB direction and has a flat plate shape when viewed from the UD direction.
• the protective member 91 is also bonded to the outermost layer of the exterior film 50.
• the protective member 91 is preferably disposed on the outside of the ridge portion 20A and on the root 70X of the first sealing portion 70. Since the protruding portion 50X is movable relative to other parts of the exterior body 40, material fatigue is likely to occur in the protruding portion 50X, particularly in the part including the root 70X of the first sealing portion 70.
• the barrier layer 52, the base material layer 51, and the heat-sealable resin layer 53 may peel off, causing cracks and damaging the exterior film 50.
• the electricity storage device 10 may be moved to any location with the protruding portion 50X (first sealing portion 70) being gripped.
• the protruding portion 50X moves relative to other portions of the exterior body 40, a portion of the exterior film 50 including the root of the protruding portion 50X, in other words, a portion including the root 70X of the first sealing portion 70, may be damaged, and the sealing performance of the power storage device 10 may be reduced.
• the protective member 91 By disposing the protective member 91 on the root 70X of the first sealing portion 70, the movement of the protruding portion 50X is suppressed, and the periphery of the root 70X can be reinforced.
• the protective member 91 is disposed on the 41st surface of the exterior body 40, but in addition to or instead of this, the protective member 91 may be disposed on the second surface 42 of the exterior body 40.
• the first surface portion 900 and the second surface portion 901 of the protective member 90 may be disposed on the outside of the ridge portion 20A so as to be aligned along the second surface 42 of the exterior body 40 and the lower surface of the protruding portion 50X, respectively.
• the protective member 90 may be disposed outside the ridge portion 20A so as to straddle the root 70X of the overhang portion 50X (first sealing portion 70) folded from the second surface 42. Furthermore, when the overhang portion 50X is folded toward the second surface 42, the protective member 90 may be disposed outside the ridge portion 20A so as to straddle the root 70X of the overhang portion 50X (first sealing portion 70) folded from the first surface 41.
• the material forming the protective member 90 and the protective member 91 may contain at least one of the following materials: resin, metal, metal oxide, carbon material (carbon fiber reinforced plastic, etc.), and rubber material. Among these, a material having cushioning properties is preferable, and examples of such materials include the same materials as those constituting the buffer layer of the exterior film 50.
• the material forming the protective member 90 and the protective member 91 is preferably an elastically deformable material.
• the internal pressure of the electric storage device 10 may increase due to volume changes of the positive electrode active material and the negative electrode active material of the electrode body 20 accompanying charging and discharging, and gas generation, etc. When the internal pressure of the electric storage device 10 increases, the exterior body 40 may expand and the exterior film 50 may stretch.
• the exterior body 40 may shrink.
• the protective members 90 and 91 are made of an elastically deformable material, the protective members 90 and 91 can deform in response to the expansion and contraction of the exterior body 40, and are less likely to separate from the exterior film 50, further enhancing the effects described below.
• the electrode body 20 contains an electrolyte, it is preferable that the surfaces of the protective members 90 and 91 are made of a material that is resistant to the electrolyte.
• the protective members 90 and 91 when the protective members 90 and 91 are formed from a material with relatively low elastic deformation, the protective members 90 and 91 have the additional effect of suppressing the expansion, contraction, and deformation of the exterior body 40 described above. Specifically, the protective members 90 and 91, which have relatively low elastic deformation, are present on the outside of the exterior film 50, thereby limiting the expansion of the exterior body 40. Furthermore, when the protective members 90 and 91 are at least partially joined to the exterior film 50, they reduce the elasticity of the exterior film 50 in that portion, thereby limiting the contraction of the exterior body 40.
• the method of joining the protective members 90 and 91 to the exterior film 50 is not particularly limited. Examples include a method of interposing an adhesive between the protective members 90 and 91 and the exterior body 40, a method of fusing the protective members 90 and 91 and the exterior body 40 with a heat-sealing resin, a method of interposing a tape having an adhesive layer on both sides between the protective members 90 and 91 and the exterior body 40, a method of forming at least one of the protective members 90 and 91 into a tape having an adhesive layer on one side and attaching it along the ridge of the electricity storage device, and the like.
• the ridges 20A to 20D and corners 230 of the electrode body 20 have a sharper shape than other parts of the electrode body 20, and when an impact is applied to the power storage device 10, they come into contact with the exterior film 50, easily damaging the exterior film 50.
• the protective members 90 and 91 cover the parts of the exterior body 40 that correspond to the ridges 20A to 20D and corners 230 of the electrode body 20.
• the exterior film 50 is reinforced in the parts that correspond to the ridges 20A to 20D and corners 230 of the electrode body 20, and the exterior film 50 can be prevented from being damaged by the ridges 20A to 20D and corners 230 of the electrode body 20. As a result, the durability of the power storage device 10 is improved.
• the power storage device 10A of the second embodiment is different from the first embodiment in that a protective member 92 is provided instead of the protective members 90 and 91, but other configurations are similar to those of the first embodiment.
• FIG. 6 is a perspective view showing a configuration of the power storage device 10A of the second embodiment.
• the power storage device 10A includes a protective member 92.
• the protective member 92 has three first parts 920, a second part 921, and two third parts 922.
• the first parts 920 are disposed on the outside of the ridge lines 20B to 20D, similar to the protective member 90.
• the second part 921 is disposed on the outside of the ridge line 20A, similar to the protective member 91.
• the third parts 922 are disposed on the outside of the pair of lid bodies 60.
• the first part 920, the second part 921, and the third part 922 are connected to each other.
• the third part 922 may have a through hole 92X formed therein for exposing the tip of the electrode terminal 30.
• the third part 922 may be configured to cover only the peripheral portion of the lid body 60.
• Each of the first parts 920 extends in the FB direction and has an L-shape when viewed from the FB direction. Both ends of the first parts 920 in the FB direction are connected to the third parts 922.
• the second part 921 extends in the FB direction and has a flat plate shape when viewed from the UD direction. Both ends of the second part 921 in the FB direction are connected to the third part 922.
• the second part 921 is preferably positioned outside the ridge portion 20A and on the base 70X of the first sealing portion 70. The reason for this is as already described in the first embodiment.
• FIG. 7 is a perspective view showing the configuration of the third part 922.
• the third part 922 has a plate-shaped wall portion 9220 that faces the second surface 62 of the lid body 60, and a side wall portion 9221 that stands up from the periphery of the wall portion 9220 and covers at least a portion of the lid seal portion 63 from the outside of the exterior film 50.
• the third part 922 is formed in a roughly container-like shape. Note that, for ease of explanation, other elements that may be formed in the third part 922, such as through holes and slits, are omitted from FIG. 7.
• the third part 922 may have a function of reinforcing the seal of the second sealing part 80 by covering the lid seal part 63 of the lid body 60, the part of the exterior film 50 facing the lid seal part 63, and at least a part of the second surface 62 of the lid body 60.
• the third part 922 is preferably formed including a material that does not transmit gas or moisture, or is formed including a layer that does not transmit gas or moisture.
• the third part 922 covers both the lid seal portion 63 and the exterior film 50 and reinforces the seal by the second sealing portion 80, even if a seal defect occurs in the second sealing portion 80, it is possible to prevent at least one of gas and moisture from entering the exterior body 40 and the electrolyte from leaking out of the exterior body 40. In other words, the gap between the exterior film 50 and the lid body 60 can be more reliably sealed.
• the third part 922 may be joined to the exterior body 40 by interposing a curable resin between the third part 922 and the lid body 60 (particularly the lid seal portion 63).
• the curable resin is a resin that includes at least one of a photocurable resin, a room temperature curable resin, a thermosetting resin, and an electron beam curable resin. Among them, it is preferable to include at least one of a photocurable resin and a room temperature curable resin.
• the photocurable resin is a resin that is cured by irradiation with light of a specific wavelength.
• Examples of the photocurable resin include radical polymerization resins that are cured by radical chain reaction with functional groups of monomers and oligomers when irradiated with ultraviolet light, and cationic polymerization resins that are cured by starting a cationic polymerization reaction when irradiated with ultraviolet light.
• examples of radical polymerization resins include acrylic resins
• examples of cationic polymerization resins include epoxy resins and vinyl ethers.
• Examples of room temperature curable resins include resins that are mainly made of epoxy resins, ester resins, or acrylic resins and are cured by mixing with a curing agent.
• thermosetting resins include phenolic resins, epoxy resins, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, silicone resins, polyurethane, and thermosetting polyimides.
• electron beam curable resins include acrylic resins.
• the method of connecting the first part 920 and the second part 921 to the third part 922 is not particularly limited.
• the first part 920 and the third part 922 can be connected by forming an engaging portion on one of them and forming an engaged portion on the other, and engaging them.
• the second part 921 and the third part 922 can be connected by forming an engaging portion on one of them and forming an engaged portion on the other, and engaging them.
• the engaging portion is, for example, a convex portion
• the engaged portion is, for example, a concave portion into which the convex portion can be fitted and fixed.
• first part 920 and the third part 922, and the second part 921 and the third part 922 may be joined to each other by an adhesive, may be joined to each other by a tape having an adhesive layer, or may be fused to each other by a heat-sealable resin.
• the first part 920 to the third part 922 may be connected and then attached to the exterior body 40 that seals the electrode body 20, or may be connected at the same time as being attached to the exterior body 40 that seals the electrode body 20.
• the first part 920, the second part 921, and the third part 922 may be formed integrally.
• the protective member 92 is preferably formed of a deformable material so that it can be attached to the exterior body 40.
• the first part 920 to the third part 922 can be formed from the same material as the material forming the protective member 90 and the protective member 91.
• the material forming each part may be different for each part, or may be the same.
• the method of joining the first part 920 to the second part 921 to the exterior film 50 is not particularly limited.
• the third part 922 can also be joined to the lid 60 and the exterior film 50 in the same manner as the first part 920 to the second part 921, in addition to or instead of the method already described.
• the same effect as that of the power storage device 10 of the first embodiment can be achieved. That is, when the first part 920 to the third part 922 are formed of an elastically deformable material, the first part 920 to the third part 922 can deform in response to the expansion and contraction of the exterior body 40 caused by the internal pressure change of the power storage device 10A, and are difficult to separate from the exterior film 50.
• the exterior film 50 is reinforced at the portions corresponding to the ridges 20A to 20D and the corners 230 of the electrode body 20, and the exterior film 50 can be prevented from being damaged by the ridges 20A to 20D and the corners 230 of the electrode body 20. Furthermore, when the third part 922 is formed to reinforce the seal by the second sealing part 80, even if a partially unsealed portion occurs in the second sealing part 80, that portion is covered by the third part 922. This allows the gap between the exterior film 50 and the lid 60 to be sealed more reliably.
• the protective member 92 has the additional effect of suppressing the above-mentioned elastic deformation of the exterior body 40.
• the internal pressure of the electricity storage device 10A may increase due to volume changes in the positive and negative active materials of the electrode body 20 accompanying charging and discharging, and gas generation, etc.
• the exterior body 40 may expand.
• the presence of the protective member 92, which has relatively low elastic deformation, on the outside of the exterior film 50 makes it possible to limit the above-mentioned expansion of the exterior body 40.
• the exterior body 40 may shrink.
• the protective member 92 is at least partially joined to the exterior film 50, it reduces the elasticity of the exterior film 50 in that portion, thereby suppressing such elastic deformation of the exterior body 40.
• the power storage device 10B of the third embodiment is different from the first embodiment in that it includes a protective member 93 instead of the protective members 90 and 91, and the protective member 93 is disposed inside the exterior body 40, but other configurations are similar to those of the first embodiment.
• Configuration of the power storage device 8 is a perspective view showing a configuration of an electricity storage device 10B of the third embodiment (however, the electrode terminals 30 are omitted from the illustration).
• a protective member 93 is disposed between the electrode body 20 and the exterior body 40. That is, the protective member 93 is sealed in the exterior body 40 together with the electrode body 20.
• FIG. 9 is a perspective view showing the configuration of the electrode body 20 and protective member 93 of the power storage device 10B.
• the protective member 93 has two side wall portions 930 that face the front surface 21 and rear surface 22 of the electrode body 20, and four frame portions 931 that connect the two side wall portions 930 between them.
• the side wall portions 930 are plate-shaped members that are spaced apart in the FB direction.
• the frame portions 931 are columnar members that extend in the FB direction and are connected to the two side wall portions 930.
• the electrode body 20 can be placed in the space defined by the side wall portions 930 and the frame portions 931.
• the four frame portions 931 are placed outside the ridge portions 20A to 20D of the electrode body 20, respectively, and prevent the corner portions 230 and the ridge portions 20A to 20D from contacting the exterior film 50.
• the frame portions 931 function as a buffer between the corner portions 230 and the ridge portions 20A to 20D and the exterior film 50.
• the shape of the frame portions 931 as viewed from the FB direction is not particularly limited, and may be, for example, an L-shape, a rectangle, a circle, a semicircle, a polygon, etc.
• the frame portions 931 may come into contact with the exterior film 50 at the outermost position of the protective member 93. For this reason, it is preferable that at least the portions of the frame portions 931 that may come into contact with the exterior film 50 are rounded so as not to damage the exterior film 50.
• the side wall portions 930 are arranged so that one faces the front surface 21 of the electrode body 20 and the other faces the back surface 22 of the electrode body 20.
• the two side wall portions 930 are arranged outside the ridge portions 20A to 20D of the electrode body 20, respectively, and prevent the corner portions 230 and the ridge portions 20A to 20D from contacting the exterior film 50.
• the side wall portions 930 function as a buffer between the corner portions 230 and the ridge portions 20A to 20D and the exterior film 50.
• it is preferable that at least the portions of the side wall portions 930 that may come into contact with the exterior film 50 are rounded so as not to damage the exterior film 50.
• the side wall portions 930 have a substantially rectangular shape when viewed from the FB direction, and it is preferable that the portions corresponding to the vertices of the rectangle are rounded.
• the side wall portion 930 may be provided with a through hole (not shown) for passing the current collecting tab of the electrode body 20 through.
• the current collecting tab can be made to protrude from the through hole of the side wall portion 930 to the outside of the protective member 93 and further electrically connected to the electrode terminal 30.
• the current collecting tab may be provided on the electrode body 20 so as to protrude in another direction, and protrude from between the frame portions 931 to the outside of the protective member 93.
• the materials for forming the side wall portion 930 and the frame portion 931 include the same materials as those listed in the first embodiment. Among them, a material having cushioning properties is preferable, and examples of such materials include the same materials as those constituting the buffer layer of the exterior film 50.
• the materials for forming the side wall portion 930 and the frame portion 931 are preferably elastically deformable materials. When the side wall portion 930 and the frame portion 931 are formed from an elastically deformable material, the protective member 93 can deform in response to the volumetric changes of the positive electrode active material and the negative electrode active material of the electrode body 20 accompanying charging and discharging, and the effects described below can be further enhanced.
• the surfaces of the side wall portion 930 and the frame portion 931 are made of a material resistant to the electrolyte.
• the materials for forming the side wall portion 930 and the frame portion 931 may be different from each other or may be the same.
• the protective member 93 has an additional effect of suppressing the expansion, contraction, and deformation of the exterior body 40.
• the internal pressure of the electricity storage device 10B may increase due to volume changes in the positive and negative active materials of the electrode body 20 accompanying charging and discharging, and gas generation, etc.
• the exterior body 40 may expand.
• vacuum drawing is performed in the manufacturing process of the electricity storage device 10B, the exterior body 40 may shrink.
• the protective member 93 is at least partially joined to the exterior film 50, thereby reducing the elasticity of the exterior film 50 in that portion, and therefore the above-mentioned expansion and contraction deformation of the exterior body 40 can be limited.
• the protective member 93 functions as a buffer material that prevents the ridges 20A-20D and the corners 230 of the electrode body 20 from contacting the exterior film 50. This prevents a particularly sharp portion of the electrode body 20 from impacting the exterior film 50 and damaging the exterior film 50. Furthermore, when the protective member 93 itself is made of an elastic material or when the portion that contacts the exterior film 50 is rounded, damage to the exterior film 50 can be more reliably prevented. In addition, the protective member 93 protects the electrode body 20 against impacts applied from the outside of the power storage device 10B. This improves the durability of the power storage device 10B.
• the power storage device 10C of the fourth embodiment is different from the third embodiment in that it includes a protective member 94 instead of the protective member 93, and the protective member 94 is configured to include a lid body 60, but other configurations are similar to those of the third embodiment.
• Configuration of the Power Storage Device 10 is a perspective view showing the configuration of an electricity storage device 10C of the fourth embodiment (however, the electrode terminals 30 are omitted from the illustration).
• the protective member 94 has a pair of lid bodies 60 and four frame portions 940 that connect the pair of lid bodies 60 between them.
• the configuration of the lid body 60 is the same as the configuration of the lid body 60 according to the first to third embodiments.
• each of the frame portions 940 is a columnar member that extends in the FB direction and is connected to the pair of lid bodies 60, and the configuration is the same as the frame portion 931 of the third embodiment.
• the electrode body 20 can be disposed in the space defined by the lid bodies 60 and the frame portions 940.
• the power storage device 10C of the fourth embodiment it is possible to achieve the same effects as the power storage device 10B of the third embodiment.
• the pair of lid bodies 60 also serve as part of the protective member 94. This makes it possible to configure the protective member 94 without excessively increasing the number of parts.
• the above-mentioned embodiments are examples of forms that the power storage device according to the present invention can take, and are not intended to limit the forms.
• the power storage device according to the present invention can take forms different from those exemplified in the respective embodiments.
• One example is a form in which a part of the configuration of each embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to each embodiment.
• Below, some examples of modified versions of each embodiment are shown. The above-mentioned embodiments and the following modified versions can be combined with each other as long as there is no technical contradiction.
• the third part 922 does not have to be formed in a generally container-like shape.
• the wall surface portion 9220 may have a through hole formed therein through which the electrode terminal 30 passes.
• the wall surface portion 9220 may also be configured in a frame shape so as to cover only the peripheral portion of the second surface 62 of the lid body 60.
• the third part 922 may have a slit or the like in the side wall portion 9221 to pass the protrusion portion 50X so as not to interfere with the protrusion portion 50X.
• the third part 922 may omit the side wall portion 9221 and have only the wall portion 9220.
• the configuration of the protective member 91 may be appropriately changed to match the position of the root 70X or may be omitted.
• the configuration of the second part 921 may be appropriately changed to match the position of the root 70X or may be omitted.
• the exterior film 50 may extend outward beyond the lid body 60 in the FB direction.
• the portion of the exterior film 50 extending beyond the lid body 60 may be folded like a Gabeltop pouch or a brick pouch.
• the portion of the exterior film 50 extending beyond the lid body 60 may be folded so as to fit along the second surface 62 of the lid body 60.
• the external shape of the exterior body 40 can be changed arbitrarily.
• the cover body 60 does not have to be rectangular when viewed from the FB direction, and may be another polygonal shape, a substantially circular shape, or a substantially elliptical shape.
• the shape of the cover body 60 may be changed, for example, according to the three-dimensional shape of the electrode body 20.
• the shapes of the protective members 90 to 94 may also be changed appropriately, for example, according to the three-dimensional shape of the electrode body 20.
• the shapes of the protective member 90 and the first part 920 when viewed from the FB direction may not be L-shaped, but may be, for example, rectangular, circular, semicircular, polygonal, etc. Note that, for example, when the electrode body 20 is substantially cylindrical, the boundary between the axial end face of the cylinder and the side peripheral surface of the cylinder becomes the ridge portion of the electrode body 20.
• an adhesive film (not shown) may be bonded to the outer peripheral surface of the electrode terminal 30.
• Any adhesive film can be selected as long as it can bond the electrode terminal 30 made of metal and the lid body 60 made of, for example, resin.
• the adhesive film can be, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.
• the adhesive film can be a single layer or two or more layers of these films.
• the protective member 93 is configured as a separate member from the exterior film 50.
• a member corresponding to at least the frame portion 931 of the protective member 93 may be previously joined to the innermost layer of the exterior film 50 so that the frame portion 931 comes into contact with the ridge portions 20A to 20D of the electrode body 20 when the electrode body 20 is wrapped in the exterior film 50.
• This also applies to the frame portion 940 of the fourth embodiment of the energy storage device 10C.
• the protective member 93 of the third embodiment and the protective member 94 of the fourth embodiment may be combined with the protective member 90 of the first embodiment or the protective member 91 of the second embodiment, respectively.
• the protective members 90 to 94 of the first to fourth embodiments have the function of suppressing deformation of the exterior body 40 described above
• the protective members 90 to 94 may be configured to focus on suppressing deformation of a specific surface of the exterior body 4 depending on the manner in which the power storage devices 10, 10A to 10C are used.
• the power storage devices 10, 10A to 10C are used arranged such that the fourth surfaces 44 of the multiple power storage devices 10, 10A to 10C contact the cooling mechanism 200.
• the power storage devices 10, 10A to 10C arranged as shown in FIG.
• the fourth surfaces 44 contact the cooling mechanism 200, and the third surfaces 43 directly contact the first surfaces 41 of the adjacent power storage devices 10, 10A to 10C, or indirectly contact the first surfaces 41 via a plate-shaped member, a buffer material, or the like. For this reason, for example, when considering expansion as one form of deformation of the exterior body 40, in the energy storage devices 10, 10A to 10C arranged as shown in FIG. 11, the first surface 41, the third surface 43, and the fourth surface 44 of the exterior body 40 are relatively resistant to expansion even when the internal pressure of the energy storage devices 10, 10A to 10C increases.
• the second surface 42 of the exterior body 40 is not in contact with other elements of the power storage device 10, 10A to 10C, and is therefore prone to expansion when the internal pressure of the power storage device 10, 10A to 10C rises.
• the protective members 90 to 92 can be configured to extend over a wider area on the second surface 42 of the exterior body 40, for example, to suppress the expansion of the second surface 42.
• the side wall portion 930, the frame portion 931, the frame portion 940, or the lid body 60 a portion that is present on the back side of the second surface 42, can be joined to the innermost layer of the exterior film 5 that faces that portion, for example, to suppress the expansion of the second surface 42.
• the protective members 90 to 94 can be configured to suppress the expansion of a specific surface of the exterior body 40. The above configuration applies not only to the expansion of the exterior body 40, but also to its contraction.
• Electrode body 20A to 20D Ridge line portion 30: Electrode terminal 40: Exterior body 40A: Opening 50: Exterior film 60: Lid body 90 to 94: Protective member 230: Corner portion

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• 2024
  • 2024-03-29 JP JP2024559858A patent/JP7726412B2/ja active Active
  • 2024-03-29 KR KR1020257026235A patent/KR20250165315A/ko active Pending
  • 2024-03-29 EP EP24780926.2A patent/EP4693631A1/en active Pending
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  • 2024-03-29 WO PCT/JP2024/013387 patent/WO2024204834A1/ja not_active Ceased
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