Electricity storage device, reinforcement member, and method for manufacturing electricity storage device

Abstract

The electricity storage device includes: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on a side of the electrode body; and an exterior film for packaging the electrode body and the reinforcing member, the electrode terminal having an exposed portion, the exposed portion being a portion exposed to the outside on the opposite side from the electrode body with respect to the reinforcing member, and a part of the exposed portion being bonded to the exterior film.

Description

Technical Field

[0001] The present invention relates to an electricity storage device, a reinforcing member for an electricity storage device, and a method for manufacturing the electricity storage device. Background Art

[0002] Patent document 1 discloses a fully solid battery as an example of a power storage device. The fully solid battery includes an electrode body, an electrode terminal, and an outer casing that seals the electrode body. The outer casing includes an outer casing film wound around the electrode body in a manner having an opening and a cover body disposed at the opening. One end of the electrode terminal is electrically connected to the electrode body. The other end of the electrode terminal is exposed outside the cover body. The electrode terminal passes through the cover body.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-153504 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the above-mentioned electricity storage device, there is a possibility that a gap is formed between the electrode terminal penetrating the cover and the cover, and thus the sealing performance of the electricity storage device is low.

[0008] The present invention provides an electric storage device with high sealing performance, a reinforcing member used for the electric storage device, and a method for manufacturing the electric storage device.

[0009] Methods for solving problems

[0010] The first aspect of the present invention provides an electrical storage device comprising: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member arranged on the side of the electrode body; and an outer film for packaging the electrode body and the reinforcing member, wherein the electrode terminal has an exposed portion, the exposed portion being a portion exposed to the outside on the side opposite to the electrode body relative to the reinforcing member, and a portion of the exposed portion being joined to the outer film.

[0011] An electric storage device according to a second aspect of the present invention is the electric storage device according to the first aspect, wherein the reinforcing member includes at least a first member and a second member that are divided.

[0012] In the electricity storage device according to a third aspect of the present invention, in the electricity storage device according to the first aspect or the second aspect, the electrode body includes a current collector, and the reinforcing member includes a recessed portion for accommodating the current collector.

[0013] In the power storage device according to a fourth aspect of the present invention, in the power storage device according to the first aspect or the second aspect, the electrode body includes a current collector, and the reinforcing member is a frame having a space for arranging the current collector.

[0014] According to a fifth aspect of the present invention, in the electricity storage device according to any one of the first to third aspects, the reinforcing member is in a plate shape and has a hole into which the electrode terminal is inserted.

[0015] In the energy storage device according to the sixth aspect of the present invention, in the energy storage device according to the first aspect or the second aspect, the reinforcing component includes: a main body; and a movable part connected to the main body and joined to the outer film, and the movable part is configured to be movable relative to the main body when the outer film expands as the internal pressure of the energy storage device increases.

[0016] In the storage device of the 7th aspect of the present invention, in the storage device of the 1st aspect or the 2nd aspect, the reinforcing component includes: a first surface facing the electrode body; and a second surface, which is connected to the first surface and extends in the direction opposite to the electrode body, and the second surface is inclined toward the center of the height direction of the reinforcing component as it goes in the direction opposite to the electrode body.

[0017] According to an eighth aspect of the present invention, in the energy storage device according to the first or second aspect, the reinforcing member includes a main body portion and an extending portion extending from the main body portion toward the electrode body, wherein the extending portion tapers toward the electrode body.

[0018] The storage device according to the 9th aspect of the present invention includes a buffer film in the storage device according to any one of the 1st aspect to the 8th aspect, which is arranged on the inner side of the outer film to improve the strength of the outer film, and the buffer film is arranged at least one of the corners of the electrode body and the corners of the reinforcing component.

[0019] According to the tenth aspect of the present invention, in the energy storage device of any one of the first to ninth aspects, the electrode body and the reinforcing component are arranged at a distance, the outer film has an expansion portion located between the electrode body and the reinforcing component, and the expansion portion is configured to be able to bulge when the outer film expands as the internal pressure of the energy storage device increases.

[0020] The storage device of the 11th aspect of the present invention includes: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing component arranged on the side of the electrode body; and an outer film for packaging the electrode body and the reinforcing component, the reinforcing component includes: a main body; and a movable part connected to the main body and joined to the outer film, the movable part is configured to be movable relative to the main body when the outer film expands as the internal pressure of the storage device increases.

[0021] The storage device of the 12th aspect of the present invention includes: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing component arranged on the side of the electrode body; and an outer film for packaging the electrode body and the reinforcing component, the reinforcing component including: a first surface facing the electrode body; and a second surface connected to the first surface and extending in a direction opposite to the electrode body, the second surface being inclined toward the center of the height direction of the reinforcing component as it extends in a direction opposite to the electrode body.

[0022] The storage device of the 13th aspect of the present invention includes: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing component arranged on the side of the electrode body; and an outer film for packaging the electrode body and the reinforcing component, the reinforcing component includes: a main body; and an extension portion extending from the main body toward the electrode body, the extension portion becoming thinner at the front end as it goes toward the electrode body.

[0023] The storage device of the 14th aspect of the present invention includes: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing component arranged on the side of the electrode body; and an outer film that packages the electrode body and the reinforcing component, a buffer film that is arranged on the inner side of the outer film and is used to increase the strength of the outer film, and the buffer film is arranged at least one of the corners of the electrode body and the corners of the reinforcing component.

[0024] The energy storage device of the 15th aspect of the present invention includes: an electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing component arranged on the side of the electrode body; and an outer film for packaging the electrode body and the reinforcing component, wherein the electrode body and the reinforcing component are arranged at a distance, and the outer film has an expansion portion located between the electrode body and the reinforcing component, and the expansion portion is configured to be able to bulge when the outer film expands as the internal pressure of the energy storage device increases.

[0025] According to a sixteenth aspect of the present invention, in the electricity storage device according to any one of the eleventh to fifteenth aspects, the reinforcing member includes at least a first member and a second member that are divided.

[0026] According to a seventeenth aspect of the present invention, in the electricity storage device according to any one of the eleventh to fifteenth aspects, the electrode body includes a current collector, and the reinforcing member has a recessed portion for housing the current collector.

[0027] According to an eighteenth aspect of the present invention, in the electricity storage device according to any one of the eleventh to fifteenth aspects, the reinforcing member is in a plate shape and has a hole into which the electrode terminal is inserted.

[0028] A reinforcing member according to a nineteenth aspect of the present invention is used for the power storage device according to any one of the first aspect to the eighteenth aspect.

[0029] A reinforcing member according to a 20th aspect of the present invention is the reinforcing member according to the 19th aspect, wherein the reinforcing member is joined to the electrode terminal.

[0030] The manufacturing method of the storage device according to the 21st aspect of the present invention is a method for manufacturing a storage device comprising an electrode body, an electrode terminal electrically connected to the electrode body, a reinforcing member arranged on the side of the electrode body, and an outer film for packaging the electrode body and the reinforcing member. The electrode terminal has an exposed portion, and the exposed portion is a portion exposed to the outside on the side opposite to the electrode body relative to the reinforcing member, and a part of the exposed portion is bonded to the outer film. The manufacturing method of the storage device includes: a connection step of electrically connecting the electrode body to the electrode terminal; a configuration step of configuring the reinforcing member in a manner to form the exposed portion, which is performed after the connection step; a packaging step of packaging the reinforcing member and the electrode body with the outer film, which is performed after the configuration step; and a sealing step of bonding the outer film to the exposed portion, which is performed after the packaging step.

[0031] A method for manufacturing an electric storage device according to a 22nd aspect of the present invention is the method for manufacturing an electric storage device according to the 21st aspect, wherein in the arranging step, the reinforcing member is arranged by insert molding on the electrode terminal in a state of being connected to the electrode body.

[0032] Effects of the Invention

[0033] According to the present invention, it is possible to provide an electricity storage device having high sealing performance, a reinforcing member for the electricity storage device, and a method for manufacturing the electricity storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a perspective view of the power storage device according to the embodiment.

[0035] Figure 2 yes Figure 1 A top view of a power storage device.

[0036] Figure 3 Yes means Figure 1 A cross-sectional view of the layer structure of an exterior film included in an electricity storage device.

[0037] Figure 4 yes Figure 1 A three-dimensional view of a reinforcement component of an electric storage device.

[0038] Figure 5 It is along Figure 2 Cross-sectional view of line D5-D5.

[0039] Figure 6 Yes means Figure 1 A flowchart of an example of a method for manufacturing an electric storage device.

[0040] Figure 7 It is a cross-sectional view of the power storage device according to the first modification.

[0041] Figure 8 It is a cross-sectional view of an electric storage device according to a second modification.

[0042] Fig. 9 It is a perspective view of a reinforcing member included in the electric storage device according to the third modification.

[0043] Fig.10 It is a cross-sectional view of an electric storage device according to a third modification.

[0044] Fig.11 yes Fig.10 A cross-sectional view of a state in which the internal pressure of an outer casing of an electric storage device increases.

[0045] Fig.12 It is a perspective view of a reinforcing member included in the electric storage device according to the fourth modification.

[0046] Fig.13 It is a cross-sectional view of an electric storage device according to a fourth modification.

[0047] Fig.14 It is a perspective view of a reinforcing member included in the electric storage device according to the fifth modification.

[0048] Fig.15 It is a cross-sectional view of an electric storage device according to a fifth modification.

[0049] Fig.16 It is a cross-sectional view of an electric storage device according to a sixth modification.

[0050] Fig.17 It is a cross-sectional view of an electric storage device according to a seventh modification.

[0051] Fig.18 It is a cross-sectional view of an electric storage device according to an eighth modification.

[0052] Fig.19 It is a plan view of an electric storage device according to another modified example of the embodiment.

[0053] Fig. 20 yes Fig.19 A side view of a power storage device.

[0054] Fig.21 It is a plan view of a power storage device according to still another modified example of the embodiment. DETAILED DESCRIPTION

[0055] Hereinafter, an electric storage device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same figure marks are given to the same or corresponding parts in the figures, and their descriptions will not be repeated. In addition, in the present embodiment, the numerical range represented by "~" means "above" or "below". For example, the expression of 2 to 15 mm means above 2 mm and below 15 mm. In the numerical range recorded in stages in the present embodiment, the upper limit value or lower limit value recorded in a certain numerical range may also be replaced by the upper limit value or lower limit value of the numerical range recorded in other stages. In addition, 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 recorded separately may be combined as numerical ranges.

[0056] [1. Implementation Method]

[0057] <1-1. Structure of power storage device>

[0058] Figure 1 It is a perspective view schematically showing the power storage device 10 according to the embodiment. Figure 2 yes Figure 1 FIG. 1 is a top view of an electric storage device 10 . Figure 3 Yes means Figure 1 1 is a cross-sectional view of a layer structure of an exterior film 50 included in an electricity storage device 10 . Figure 4 yes Figure 1 1 is a perspective view of a reinforcing member 60 included in the power storage device 10 . Figure 5 It is along Figure 2 The cross-sectional view of the D5-D5 line. Figure 2 and Figure 5 UD and LR indicate the thickness direction and width direction of the power storage device 10, respectively. FB indicates the depth direction of the power storage device 10. The directions indicated by arrows UD, LR, and FB are the same in the following figures.

[0059] The power storage device 10 includes an electrode body 20, an electrode terminal 30 and an outer body 40. The electrode body 20 includes, for example, electrodes (positive and negative electrodes) and a separator that constitute a power storage component such as a lithium-ion battery, a capacitor, or an all-solid battery. In the present embodiment, the shape of the electrode body 20 is roughly rectangular. In addition, "roughly rectangular" includes, in addition to a complete rectangular, a solid that is considered as a rectangular by modifying the shape of a portion of the outer surface. The shape of the electrode body 20 can be, for example, a cylinder or a polygonal column.

[0060] In the present embodiment, the power storage device 10 includes two electrode terminals 30. The electrode terminal 30 is a metal terminal for inputting and outputting power in the electrode body 20. One end of the electrode terminal 30 is electrically connected to the electrode (positive electrode or negative electrode) included in the electrode body 20 by connecting to the collector 20X. The other end of the electrode terminal 30 protrudes outward from the edge of the outer body 40, for example.

[0061] The metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, or copper. For example, when the electrode body 20 is a lithium-ion battery, the electrode terminal 30 connected to the positive electrode is usually made of aluminum, and the electrode terminal 30 connected to the negative electrode is usually made of copper, nickel, etc. In addition, 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.

[0062] The outer package 40 seals the electrode body 20. The outer package 40 includes an outer film 50 and a reinforcing member 60. The outer film 50 packages the electrode body 20 and the reinforcing member 60 disposed on the side of the electrode body 20. In the present embodiment, one outer film 50 is wound around the electrode body 20 and the reinforcing member 60. The outer film 50 is preferably wound around the electrode body 20 and the reinforcing member 60 in a manner along the MD (Machine Direction).

[0063] The electrode terminal 30 is joined to the reinforcing member 60 in a manner having an exposed portion 30A, which is a portion exposed to the outside of the electrode body 20 on the opposite side of the reinforcing member 60. From the viewpoint of properly joining the electrode terminal 30 to the reinforcing member 60, it is preferred to join the adhesive film 31 to the electrode terminal 30. The adhesive film 31 can be arbitrarily selected as long as it is a film that can bond the electrode terminal 30 composed of metal to the reinforcing member 60 composed of resin. The adhesive film 31 can use, for example, polyolefin resins such as polyethylene resins and polypropylene resins, cyclic polyolefin resins, or acid-modified polyolefin resins obtained by grafting these polyolefin resins with acids such as maleic anhydride. The adhesive film 31 can be a single layer or a film of more than two layers. A gas absorbent and a water absorbent can be added to the material constituting the adhesive film 31 as needed. When a gas absorbent is added to the material constituting the adhesive film 31, it is possible to absorb the gas existing in the power storage device 10 and leaking out of the power storage device, and the gas intruding into the power storage device 10 from outside the power storage device 10. When a water absorbent is added to the material constituting the adhesive film 31, it is possible to absorb the moisture existing in the power storage device 10 and leaking out of the power storage device, and the moisture intruding into the power storage device 10 from outside the power storage device 10. Among them, as the water absorbent, a known water absorbent can be used, and an inorganic water absorbent can be preferably used. Preferred specific examples of inorganic water absorbents include calcium oxide, anhydrous magnesium sulfate, magnesium oxide, calcium chloride, zeolite, aluminum oxide, silica gel, aluminum oxide gel, and burnt alum. As a gas absorbent, a known gas absorbent can be used. For example, as a gas absorbent, hydrophobic zeolite, bentonite, sepiolite, calcium oxide, copper oxide, or zinc oxide having a SiO2 / Al2O3 molar ratio of 1 / 1 to 2000 / 1 can be cited. In the present embodiment, the adhesive film 31 is bonded to substantially the entire portion of the electrode terminal 30 covered by the reinforcing member 60 and to a portion bonded to the exterior film 50 for forming a terminal sealing portion 90 described later.

[0064] For example, there is a method of forming a storage portion (depression) for storing the electrode body 20 in the outer film 50 by cold forming. However, it is not necessarily easy to form a deep storage portion by such a method. If you want to form a storage portion (depression) deeper by cold forming (for example, a forming depth of 15 mm), the possibility of pinholes or cracks in the outer film 50 causing a decrease in battery performance becomes higher. On the other hand, in the present embodiment, the outer body 40 seals the electrode body 20 by winding the outer film 50 around the electrode body 20, so the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20. Among them, in order to reduce the dead zone between the electrode body 20 and the outer film 50 to increase the volume energy density of the storage device 10, it is preferred that the outer film 50 is wound in a manner in contact with the outer surface of the electrode body 20. In addition, when the energy storage device 10 is an all-solid-state battery, from the perspective of uniformly applying high pressure from the outer surface of the battery in order to exert the battery performance, it is also necessary to eliminate the space between the electrode body 20 and the outer film 50, so it is preferred that the outer film 50 is wound in a manner that is in contact with the outer surface of the electrode body 20.

[0065] like Figure 3 As shown in the figure, the outer film 50 is, for example, a laminate (laminated film) having a base layer 51, a barrier layer 52, and a heat-fusible resin layer 53 in sequence. The outer film 50 does not need to include all these layers, and for example, the barrier layer 52 may not be included. That is, the outer film 50 only needs to be made of a flexible and easily bendable material, and for example, it may be made of a resin film. In addition, the outer film 50 is preferably heat-sealable.

[0066] The base layer 51 contained in the outer film 50 is a layer for imparting heat resistance to the outer film 50 and suppressing the generation of pinholes that may occur during processing or circulation. The base layer 51 is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer. For example, by making the base layer 51 contain at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer, it is possible to protect the barrier layer 52 during the processing of the outer film 50 and suppress the breakage of the outer film 50. In addition, from the viewpoint of increasing the tensile elongation of the outer film 50, the stretched polyester resin layer is preferably a biaxially stretched polyester resin layer, and the stretched polyamide resin layer is preferably a biaxially stretched polyamide resin layer. Furthermore, from the perspective of excellent puncture strength or impact strength, the stretched polyester resin layer is more preferably a biaxially stretched polyethylene terephthalate (PET) film, and the stretched polyamide resin layer is more preferably a biaxially stretched nylon (ONy) film. Among them, the base layer 51 can be composed of two layers of a stretched polyester resin layer and a stretched polyamide resin layer. From the viewpoint of film strength, the thickness of the base material layer 51 is, for example, preferably 5 μm to 300 μm, and more preferably 5 μm to 150 μm.

[0067] The barrier layer 52 is a layer that at least inhibits the infiltration of moisture. The barrier layer 52 is bonded to the substrate layer 51, for example, via an adhesive layer 54. As the barrier layer 52, for example, metal foil, vapor-deposited film, resin layer, etc. having barrier properties can be cited. As the vapor-deposited film, metal vapor-deposited film, inorganic oxide vapor-deposited film, carbon-containing inorganic oxide vapor-deposited film, etc. can be cited. As the resin layer, polyvinylidene chloride, polymers with chlorotrifluoroethylene (CTFE) as the main component, polymers with tetrafluoroethylene (TFE) as the main component, polymers with fluoroalkyl groups, and polymers with fluoroalkyl units as the main component, etc., fluorine-containing resins, ethylene-vinyl alcohol copolymers, etc. can be cited. In addition, as the barrier layer 52, resin films provided with at least one layer of these vapor-deposited films and resin layers can also be cited. The barrier layer 52 can also be provided with multiple layers. The barrier layer 52 preferably includes a layer composed of a metal material. Specific examples of the metal material constituting the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates. When used as a metal foil, it is preferably at least one of an aluminum alloy foil and a stainless steel foil.

[0068] In the barrier layer 52, the layer composed of the above-mentioned metal material may contain recycled materials of metal materials. As recycled materials of metal materials, for example, recycled materials of aluminum alloys, stainless steel, titanium steel or steel plates can be mentioned. These recycled materials can be obtained by known methods respectively. Recycled materials of aluminum alloys can be obtained, for example, by the manufacturing method described in International Publication No. 2022 / 092231. The barrier layer 52 may be composed only of recycled materials, or may be composed of a mixed material of recycled materials and raw materials. Among them, recycled materials of metal materials refer to so-called various products used in the city, waste discharged from the manufacturing process, etc., which are recovered, separated, refined, etc. to become a metal material that can be reused. In addition, the raw materials of metal materials refer to new metal materials refined from natural resources (raw materials) of metals, not recycled materials.

[0069] From the viewpoint of improving the formability of the exterior film 50, the aluminum alloy foil is preferably a soft aluminum alloy foil composed of an annealed aluminum alloy, etc., and from the viewpoint of further improving the formability, it is preferably an aluminum alloy foil containing iron. In the aluminum alloy foil containing iron (100% by mass), the content of iron is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass. By making the content of iron 0.1% or more, an exterior film 50 with better formability can be obtained. By making the content of iron 9.0% or less, an exterior film 50 with better flexibility can be obtained. As the soft aluminum alloy foil, for example, an aluminum alloy foil having a composition specified in JIS H4160: 1994A8021H-O, JIS H4160: 1994A8079H-O, JIS H4000: 2014A8021P-O, or JIS H4000: 2014A8079P-O can be cited. Furthermore, silicon, magnesium, copper, manganese, etc. may be added as necessary. Softening can be performed by annealing treatment or the like.

[0070] In addition, examples of the stainless steel foil include austenitic, ferrite, austenite-ferrite, martensitic, and precipitation hardened stainless steel foils, etc. Furthermore, from the viewpoint of providing an exterior film 50 having excellent formability, the stainless steel foil is preferably made of austenitic stainless steel.

[0071] Specific examples of the austenitic stainless steel constituting the stainless steel foil include SUS304, SUS301, and SUS316L. Among them, SUS304 is particularly preferred.

[0072] Regarding the thickness of the barrier layer 52, in the case of a metal foil, as long as it functions as a barrier layer that at least inhibits the infiltration of moisture, for example, it can be about 5 to 200 μm. The thickness of the barrier layer 52 is preferably about 85 μm or less, more preferably about 50 μm or less, further preferably about 40 μm or less, and particularly preferably about 35 μm or less. In addition, the thickness of the barrier layer 52 is preferably about 10 μm or more, further preferably about 20 μm or more, and more preferably about 25 μm or more. In addition, as a preferred range of the thickness of the barrier layer 52, there can be mentioned about 10 to 85 μm, about 10 to 50 μm, about 10 to 40 μm, about 10 to 35 μm, about 20 to 85 μm, about 20 to 50 μm, about 20 to 40 μm, about 20 to 35 μm, about 25 to 85 μm, about 25 to 50 μm, about 25 to 40 μm, and about 25 to 35 μm. When the barrier layer 52 is made of aluminum alloy foil, the above range is particularly preferred. In addition, from the viewpoint of imparting high formability and high rigidity to the exterior film 50, the thickness of the barrier layer 52 is preferably about 35 μm or more, more preferably about 45 μm or more, further preferably about 50 μm or more, further preferably about 55 μm or more, and preferably about 200 μm or less, more preferably about 85 μm or less, further preferably about 75 μm or less, further preferably about 70 μm or less, and the preferred range is 35 to 200 μm. The thickness of the outer film 50 is 35 to 85 μm, 35 to 75 μm, 35 to 70 μm, 45 to 200 μm, 45 to 85 μm, 45 to 75 μm, 45 to 70 μm, 50 to 200 μm, 50 to 85 μm, 50 to 75 μm, 50 to 70 μm, 55 to 200 μm, 55 to 85 μm, 55 to 75 μm, 55 to 70 μm. By including high formability in the outer film 50, deep drawing becomes easy, which can contribute to the high capacity of the storage device. In addition, when the capacity of the storage device is increased, the weight of the storage device increases, but by increasing the rigidity of the outer film 50, it can contribute to the high sealing of the storage device. In addition, in particular, when the barrier layer 52 is composed of a stainless steel foil, the thickness of the stainless steel foil is preferably about 60 μm or less, more preferably about 50 μm or less, further preferably about 40 μm or less, further preferably about 30 μm or less, and particularly preferably about 25 μm or less. In addition, the thickness of the stainless steel foil is preferably about 10 μm or more, and more preferably about 15 μm or more. In addition, as a preferred range of the thickness of the stainless steel foil, there are 10 to 60 μm, 10 to 50 μm, 10 to 40 μm, 10 to 30 μm, 10 to 25 μm, 15 to 60 μm, 15 to 50 μm, 15 to 40 μm, 15 to 30 μm, and 15 to 25 μm.

[0073] In addition, in the case where the barrier layer 52 is an aluminum foil, in order to prevent dissolution, corrosion, etc., it is preferred that at least the surface opposite to the substrate layer 51 includes a corrosion-resistant film. The barrier layer 52 may also include a corrosion-resistant film on both sides. Here, the corrosion-resistant film refers to, for example, the surface of the barrier layer 52 is not subjected to hot water modification treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment with nickel or chromium, etc., or anti-corrosion treatment by coating a coating agent, so that the barrier layer 52 includes a corrosion-resistant (for example, acid-resistant, alkali-resistant, etc.) film. The corrosion-resistant film specifically refers to 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. As a treatment for forming a corrosion-resistant film, one type may be performed, or a combination of two or more types may be performed. In addition, not only one layer but also multiple layers are possible. Furthermore, among these treatments, the hot water modification treatment and the anodic oxidation treatment are treatments in which the surface of the metal foil is dissolved by a treatment agent to form a metal compound having excellent corrosion resistance. In addition, these treatments are sometimes also included in the definition of chemical conversion treatment. In addition, when the barrier layer 52 includes a corrosion-resistant film, the barrier layer 52 is provided including the corrosion-resistant film.

[0074] The corrosion-resistant film prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the substrate layer 51 during the forming of the outer film 50, and utilizes hydrogen fluoride generated by the reaction of the electrolyte and water to prevent the dissolution and corrosion of the surface of the barrier layer 52. In particular, when the barrier layer 52 is an aluminum alloy foil, the film prevents the dissolution and corrosion of aluminum oxide on the surface of the barrier layer 52, and improves the adhesion (wettability) of the surface of the barrier layer 52, showing the effect of preventing delamination of the substrate layer 51 and the barrier layer 52 during heat sealing and during forming.

[0075] The heat-fusible resin layer 53 is bonded to the barrier layer 52 via, for example, an adhesive layer 55. The heat-fusible resin layer 53 included in the exterior film 50 is a layer that imparts heat-sealing sealing properties to the exterior film 50. Examples of the heat-fusible resin layer 53 include a resin film 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 viewpoint of sealing properties and strength, the thickness of the heat-fusible resin layer 53 is preferably, for example, 20 μm to 300 μm, and more preferably 40 μm to 150 μm.

[0076] The exterior film 50 preferably has one or more layers having a buffer function (hereinafter referred to as "buffer layer") on the outside of the heat-fusible resin layer 53, more preferably on the outside of the barrier layer 52. The buffer layer may be laminated on the outside of the base layer 51, and the base layer 51 may also have the function of the buffer layer. When the exterior film 50 has a plurality of buffer layers, the plurality of buffer layers may be adjacent to each other or laminated with the base layer 51 or the barrier layer 52 interposed therebetween.

[0077] The material constituting the buffer layer can be arbitrarily selected from materials having buffering properties. The material having buffering properties is, for example, rubber, non-woven fabric or foam sheet. The rubber is, for example, natural rubber, fluororubber or silicone rubber. The rubber hardness is preferably 20 to 90 degrees. The material constituting the non-woven fabric is preferably a material with excellent heat resistance. In the case where the buffer layer is composed of a non-woven fabric, the lower limit of the thickness of the buffer layer is preferably 100 μm, more preferably 200 μm, and more preferably 1000 μm. In the case where the buffer layer is composed of a non-woven fabric, the upper limit of the thickness of the buffer layer is preferably 5000 μm, and more preferably 3000 μm. The preferred range of the thickness of the buffer layer is 100 μm to 5000 μm, 100 μm to 3000 μm, 200 μm to 5000 μm, 200 μm to 3000 μm, 1000 μm to 5000 μm or 1000 μm to 3000 μm. Among them, the thickness of the buffer layer is most preferably in the range of 1000 μm to 3000 μm.

[0078] When the buffer layer is made of rubber, the lower limit of the thickness of the buffer layer is preferably 1 mm, more preferably 0.5 mm. When the buffer layer is made of rubber, the upper limit of the thickness of the buffer layer is preferably 10 mm, more preferably 5 mm, and more preferably 2 mm. When the buffer layer is made of rubber, the preferred range of the thickness of the buffer layer is 1 mm to 10 mm, 1 mm to 5 mm, 1 mm to 2 mm, 0.5 mm to 10 mm, 0.5 mm to 5 mm, or 0.5 mm to 2 mm.

[0079] When the outer film 50 has a buffer layer, the buffer layer functions as a buffer, so that damage to the outer film 50 due to impact when the power storage device 10 is dropped or handling during the manufacture of the power storage device 10 can be suppressed.

[0080] In the present embodiment, in a state where the outer film 50 is wound around the electrode body 20 and the reinforcing member 60, the mutually facing surfaces (thermal fusible resin layers 53) of the outer film 50 are heat-sealed to each other, thereby forming the first sealing portion 70. In the present embodiment, the first sealing portion 70 extends in the longitudinal direction (FB direction) of the outer body 40. In the outer body 40, the position where the first sealing portion 70 is formed can be arbitrarily selected. In the present embodiment, the root 70X of the first sealing portion 70 is preferably located on the edge 43 of the boundary between the first surface 41 and the second surface 42 of the outer body 40. The area of ​​the first surface 41 is larger than the area of ​​the second surface 42. The root 70X of the first sealing portion 70 may also be located on any surface of the outer body 40. In the present embodiment, the first sealing portion 70 is folded, for example, toward the second surface 42 of the outer body 40. When viewed from above, the first sealing portion 70 may extend further outward than the electrode body 20, or may be folded toward the first surface 41.

[0081] The reinforcing member 60 is, for example, in the shape of a rectangular parallelepiped as a whole and is made of a resin material. The reinforcing member 60 is a cover that seals the side of the electrode body 20. As the material constituting the reinforcing member 60, polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, fluorine resins, cyclic polyolefin resins, or acid-modified polyolefin resins obtained by grafting and modifying these polyolefin resins with acids such as maleic anhydride, etc. can be cited. The material constituting the reinforcing member 60 can also be selected according to the specific example of the power storage device 10. In the case where the power storage device 10 is a lithium ion secondary battery, the material constituting the reinforcing member 60 is preferably a material resistant to electrolyte or a material resistant to hydrofluoric acid. In the case where the power storage device 10 is a fully solid battery, the material constituting the reinforcing member 60 is preferably a material resistant to hydrogen sulfide. In the material constituting the reinforcing member 60, a gas absorbent and a water absorbent can also be added as needed. When a gas absorbent is added to the material constituting the reinforcing member 60, it is possible to absorb the gas existing in the power storage device 10 and leaking out of the power storage device 10, and the gas intruding into the power storage device 10 from outside the power storage device 10. When a water absorbent is added to the material constituting the reinforcing member 60, it is possible to absorb the moisture existing in the power storage device 10 and leaking out of the power storage device 10, and the moisture intruding into the power storage device 10 from outside the power storage device 10. Among them, as the water absorbent, a known water absorbent can be used, and an inorganic water absorbent can be preferably used. Preferred specific examples of the inorganic water absorbent include calcium oxide, anhydrous magnesium sulfate, magnesium oxide, calcium chloride, zeolite, aluminum oxide, silica gel, aluminum oxide gel, and burnt alum. As the gas absorbent, a known gas absorbent can be used. For example, as the gas absorbent, there can be mentioned hydrophobic zeolite having a SiO2 / Al2O3 molar ratio of 1 / 1 to 2000 / 1, bentonite, sepiolite, calcium oxide, copper oxide, or zinc oxide.

[0082] From the viewpoint of appropriately heat-sealing the reinforcing member 60 and the outer film 50, the material constituting the reinforcing member 60 and the material constituting the heat-fusible resin layer 53 of the outer film 50 are preferably the same as the main material. In the present embodiment, the material constituting the reinforcing member 60 and the material constituting the heat-fusible resin layer 53 are mainly polyolefin resins such as polyethylene resins and polypropylene resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with acids such as maleic anhydride. In addition, the main material refers to, for example, a material that accounts for 50% or more of the materials included in the constituent elements.

[0083] In addition to resin molded products, the reinforcing member 60 may also be a metal molded product. When the reinforcing member 60 is a metal molded product, the material constituting the reinforcing member 60 can be, for example, aluminum, titanium, nickel, copper, stainless steel, iron or titanium materials. When the reinforcing member 60 is a metal molded product or a resin molded product, the reinforcing member 60 preferably has a certain degree of thickness so that even when the storage device 10 is overlapped, the outer body 40 can be suppressed from deforming. In another viewpoint, when the reinforcing member 60 is a metal molded product or a resin molded product, when the second sealing portion 80 is formed, the side 60C of the reinforcing member 60 preferably has a certain degree of thickness so that the side 60C of the reinforcing member 60 can be appropriately heat-sealed with the outer film 50. The minimum value of the thickness of the reinforcing member 60 is, for example, 1.0 mm, more preferably 3 mm, and more preferably 4 mm. The maximum value of the thickness of the reinforcing member 60 is, for example, 10 mm, more preferably 8.0 mm, and more preferably 7.0 mm. The maximum value of the thickness of the reinforcing member 60 may also be more than 10 mm. The preferred range of the thickness of the material of the reinforcing member 60 is 1.0 mm to 10 mm, 1.0 mm to 8.0 mm, 1.0 mm to 7.0 mm, 3.0 mm to 10 mm, 3.0 mm to 8.0 mm, 3.0 mm to 7.0 mm, 4.0 mm to 10 mm, 4.0 mm to 8.0 mm, 4.0 mm to 7.0 mm. In the present invention, when the reinforcing member 60 is a metal molded product or a resin molded product, the material constituting the reinforcing member 60 does not include the film specified by the [Packaging Terms] standard of JIS (Japanese Industrial Standards). The thickness of the reinforcing member 60 may also be different depending on the location of the reinforcing member 60. When the thickness of the reinforcing member 60 is different depending on the location, the thickness of the reinforcing member 60 is the thickness of the thickest part. In addition, the specifications related to these reinforcing members 60 can also be applied to the following modifications in the same manner.

[0084] In the present embodiment, from the viewpoint of appropriately arranging the electrode terminal 30 at a desired position, the reinforcing member 60 has a divided first member 61 and a second member 62. The first member 61 is arranged above the second member 62. The reinforcing member 60 may also be configured to include more than three members. In the case where the reinforcing member 60 is composed of a plurality of divided members, at least two members may also be composed of different materials. The first member 61 and the second member 62 are preferably joined to the electrode terminal 30 via the adhesive film 31 by at least one selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, infrared welding and adhesive as required. Since the electrode terminal 30 is firmly joined to the reinforcing member 60, the electrode terminal 30 can be appropriately held by the reinforcing member 60. In the case where the electrode terminal 30 is not joined to the adhesive film 31, it is preferred that the first member 61 and the second member 62 are joined to the electrode terminal 30 by an adhesive. The adhesive may be, for example, an adhesive for hot melt or dry lamination.

[0085] The shape of the first component 61 and the shape of the second component 62 can be arbitrarily selected as long as they can clamp the electrode terminal 30 in a manner that allows input and output of power via the electrode terminal 30. The first component 61 and the second component 62 are preferably substantially the same shape. In the present embodiment, the length of the first component 61 in the UD direction is longer than the length of the second component 62 in the UD direction. Therefore, the electrode terminal 30 is located at a position lower than the center of the reinforcing component 60 in the UD direction. The electrode terminal 30 may also be located at the center of the reinforcing component 60 or at a position higher than the center in the UD direction.

[0086] like Figure 4 As shown, the reinforcing member 60 has a first surface 60A facing the electrode body 20 in the state where the first member 61 and the second member 62 are combined, a second surface 60B opposite to the first surface 60A, and a side surface 60C connecting the first surface 60A and the second surface 60B.

[0087] like Figure 5 As shown, in the present embodiment, the second sealing portion 80 is formed by heat-sealing the outer film 50 with the second surface 60B and the side surface 60C of the reinforcing member 60. Furthermore, in the present embodiment, from the viewpoint of improving the airtightness of the outer body 40, the terminal sealing portion 90 is formed by joining the outer film 50 with the exposed portion 30A of the electrode terminal 30. In the terminal sealing portion 90, the outer film 50 and the exposed portion 30A are joined via the adhesive film 31 as needed. In addition, in the present embodiment, it is sufficient to form at least the terminal sealing portion 90 of the second sealing portion 80 and the terminal sealing portion 90. In other words, in the present embodiment, at least one of the second surface 60B and the side surface 60C of the reinforcing member 60 may not be joined to the outer film 50.

[0088] <1-2. Method for manufacturing power storage device>

[0089] Figure 6 1 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, and a ninth step. The first step to the ninth step are performed, for example, by a manufacturing apparatus for the power storage device 10. In addition, in the present embodiment, the first step to the ninth step are steps in which the names of the steps are specified for convenience, and do not mean the order of the steps.

[0090] In the first process of step S11 , the manufacturing apparatus manufactures the first member 61 and the second member 62 .

[0091] The second process of step S12 is performed after the first process. In the second process, the manufacturing apparatus joins the adhesive film 31 to the electrode terminal 30. Alternatively, the second process may be performed before the first process.

[0092] The third step (connection step) of step S13 is performed after the second step. In the third step, the manufacturing apparatus connects the electrode terminal 30 to the current collector 20X to electrically connect the electrode terminal 30 to the electrode of the electrode body 20. Alternatively, the third step may be performed before the second step.

[0093] The fourth step (arrangement step) of step S14 is performed after the first step, the second step, or the third step. In the fourth step, the manufacturing device sandwiches the electrode terminal 30 with the first member 61 and the second member 62. The manufacturing device joins the first member 61 and the second member 62 to the electrode terminal 30 by at least one selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, infrared welding, and adhesives. The fourth step is completed, and the electrode terminal 30 is joined to the reinforcing member 60.

[0094] The fifth step (packaging process) of step S15 is performed after the fourth step. In the fifth step, the manufacturing apparatus packages the electrode body 20 and the reinforcing member 60 with the exterior film 50 .

[0095] The sixth process of step S16 is implemented after the fifth process. In the fifth process, the manufacturing device forms a first sealing portion 70 (hereinafter referred to as a "temporary first sealing portion") having an unsealed portion in a portion by heat-sealing the relative heat-fusible resin layers 53 of the outer film 50 to each other. In addition, the unsealed portion can be formed, for example, by using a sealing strip having a shape in which a portion does not contact the outer film 50. In another example, the unsealed portion can be formed by sandwiching a fluororesin film or the like between the mutually facing surfaces (heat-fusible resin layers 53) of the outer film 50. By forming the temporary first sealing portion before the second sealing portion 80 and the terminal sealing portion 90, the electrode body 20 can be maintained by the outer film 50, so the position of the electrode body 20 relative to the outer film 50 is not easily shifted. Therefore, when the second sealing portion 80 and the terminal sealing portion 90 are formed, the generation of wrinkles can be suppressed.

[0096] The seventh step of step S17 is performed after the sixth step. In the seventh step, the manufacturing apparatus heat-seals the exterior film 50 and the second surface 60B and the side surface 60C of the reinforcing member 60 to form the second sealed portion 80 .

[0097] The eighth step (sealing step) of step S18 is performed after the seventh step. In the eighth step, the manufacturing apparatus heat-seals the exterior film 50 and the exposed portion 30A of the electrode terminal 30 to form the terminal sealing portion 90. Alternatively, the eighth step may be performed before the seventh step.

[0098] The ninth process of step S19 is performed after the seventh process or the eighth process. In the ninth process, the manufacturing apparatus injects the electrolyte from the unsealed portion of the temporary first sealed portion, evacuates the outer film 50, and then heat-seals the unsealed portion, thereby forming the first sealed portion 70. In addition, when the power storage device 10 is an all-solid-state battery, the step of injecting the electrolyte is omitted in the ninth process.

[0099] <1-3. Functions and effects of energy storage devices>

[0100] According to the electricity storage device 10, since the terminal sealing portion 90 is provided, even if there are gaps between the electrode body 20 and the first member 61 and the second member 62 of the reinforcing member 60, the gaps are sealed by the exterior film 50. Therefore, the sealing property of the electricity storage device 10 is improved.

[0101] [2. First Modification of Implementation Example]

[0102] The power storage device 210 of the first modified example (hereinafter referred to as the "first modified example") of the embodiment is different from the embodiment in that it includes a reinforcing member 260, and the other structures are the same as the embodiment. The power storage device 210 of the first modified example will be described below, focusing on the parts that are different from the embodiment.

[0103] <2-1. Structure of power storage device>

[0104] Figure 7 It is a cross-sectional view of the energy storage device 210 of the first variant. The energy storage device 210 includes a reinforcing member 260. The reinforcing member 260 is a cover that seals the side of the electrode body 20. The reinforcing member 260 has a divided first member 261 and a second member 262. The first member 261 is arranged above the second member 262. The reinforcing member 260 has a first surface 260A facing the electrode body 20 when the first member 261 and the second member 262 are combined, a second surface 260B opposite to the first surface 260A, and a side surface 260C connecting the first surface 260A and the second surface 260B.

[0105] In the first variant, from the viewpoint of shortening the distance between the reinforcing member 260 and the electrode body 20 in the FB direction, the reinforcing member 260 has a recess 260X for accommodating at least a portion of the current collector 20X. In the first variant, the recess 260X has a size that can accommodate substantially the entirety of the current collector 20X. The recess 260X is recessed from the first surface 260A to the second surface 260B. The recess 260X does not penetrate the first surface 260A and the second surface 260B. The depth LA of the recess 260X in the FB direction can be arbitrarily selected. From the viewpoint of accommodating more current collectors 20X, the additional degree LA is preferably more than half of the length of the side surface 260C in the FB direction.

[0106] <2-2. Functions and effects of power storage devices>

[0107] According to the first modified example, the same operation and effect as the embodiment of the power storage device 10 can be obtained. Furthermore, according to the power storage device 210, since at least a part of the current collector 20X is accommodated in the recessed portion 260X of the reinforcing member 260, the distance between the reinforcing member 260 and the electrode body 20 in the FB direction can be shortened. Therefore, the power storage device 210 can be configured to be compact.

[0108] [3. Second Modification of Implementation]

[0109] The power storage device 310 of the second modified example (hereinafter referred to as the "second modified example") of the embodiment is different from the embodiment in that it includes a reinforcing member 360, and the other structures are the same as the embodiment. The power storage device 310 of the second modified example will be described below, focusing on the parts that are different from the embodiment.

[0110] <3-1. Structure of power storage device>

[0111] Figure 8It is a cross-sectional view of the energy storage device 310 of the second variant. The energy storage device 310 includes a reinforcing member 360. The reinforcing member 360 is a cover body that seals the side of the electrode body 20. Depending on the shape of the reinforcing member 360, the electrode body 20 may not be properly sealed due to damage to the outer film 50 or wrinkles on the outer film 50. The energy storage device 310 of the second variant is configured to be able to properly seal the electrode body 20. The reinforcing member 360 has a divided first member 361 and a second member 362. The first member 361 is arranged above the second member 362. The reinforcing member 360 has a first surface 360A facing the electrode body 20 when the first member 361 and the second member 362 are combined, a second surface 360B opposite to the first surface 360A, and a side surface 360C connecting the first surface 360A and the second surface 360B.

[0112] The second surface 360B is divided into a first inclined surface 360BX formed on the first component 361 and a second inclined surface 360BY formed on the second component 362. The first inclined surface 360BX and the second inclined surface 360BY extend in a direction opposite to the electrode body 20. The first inclined surface 360BX and the second inclined surface 360BY are inclined toward the center of the height direction (UD direction) of the reinforcing component 360 as they go in a direction opposite to the electrode body 20. In other words, the first inclined surface 360BX and the second inclined surface 360BY are inclined toward the electrode terminal 30 as they go in a direction opposite to the electrode body 20. Therefore, the first inclined surface 360BX and the second inclined surface 360BY approach each other as they go in a direction opposite to the electrode body 20. Since the area of ​​the second surface 360B is large, in the second sealing portion 80, most of the outer film 50 is bonded to the second surface 60B. Therefore, the sealing performance of the power storage device 310 is improved.

[0113] In the second modification, the angle formed by the first inclined surface 360BX and the second inclined surface 360BY and the side surface 360C exceeds 90 degrees from the viewpoint of suppressing damage to the outer film 50 and suppressing wrinkles in the second sealing portion 80. In addition, in the power storage device 310 of the second modification, the terminal sealing portion 90 can also be omitted.

[0114] <3-2. Functions and effects of power storage devices>

[0115] According to the power storage device 310 of the second modified example, the same action and effect as the power storage device 10 of the embodiment can be obtained. Furthermore, according to the power storage device 310, the angle formed by the first inclined surface 360BX and the second inclined surface 360BY and the side surface 360C exceeds 90 degrees. Since the corner of the boundary between the side surface 360C and the second surface 360B is an obtuse angle, it is possible to suppress the damage of the outer film 50. In addition, wrinkles are suppressed when the second sealing portion 80 is formed on the outer film 50.

[0116] [4. Third Modification of Implementation Example]

[0117] The power storage device 410 of the third modified example (hereinafter referred to as the "third modified example") of the embodiment is different from the embodiment in that it includes a reinforcing member 460, and the other structures are the same as the embodiment. The power storage device 410 of the third modified example will be described below, focusing on the parts that are different from the embodiment.

[0118] <4-1. Structure of power storage device>

[0119] Fig. 9 It is a perspective view of a reinforcing member 460 included in an electric storage device 410 according to a third modified example. Fig.10 is a cross-sectional view of the power storage device 410 . Fig.11 yes Fig.10 A cross-sectional view of a state in which the internal pressure of the outer casing 40 of the power storage device 410 increases. The power storage device 410 generates gas due to long-term use, or at least one of the electrode body 20 expands, and thus the internal pressure of the outer casing 40 sometimes increases. When the internal pressure of the outer casing 40 increases, the outer film 50 may be peeled off from the reinforcing member 460. When the outer film 50 is peeled off from the reinforcing member 460, the electrode body 20 cannot be properly sealed. The power storage device 410 of the third modified example is configured to be able to properly seal the electrode body 20.

[0120] like Fig. 9 As shown, the reinforcing member 460 has a divided first member 461 and a second member 462. The reinforcing member 460 is a cover that seals the side of the electrode body 20. The first member 461 is arranged above the second member 462. The reinforcing member 460 has a first surface 460A facing the electrode body 20 when the first member 461 and the second member 462 are combined, a second surface 460B opposite to the first surface 460A, and a side surface 460C connecting the first surface 460A and the second surface 460B.

[0121] The first member 461 includes a main body 461X and a movable portion 461Y movable relative to the main body 461X. The second member 462 includes a main body 462X and a movable portion 462Y movable relative to the main body 462X. The main bodies 461X and 462X constitute the first surface 460A, the second surface 460B, and the side surface 460C.

[0122] When the outer film 50 expands with the expansion of the electrode body 20, the movable parts 461Y and 462Y are movable relative to the main parts 461X and 462X. The movable part 461Y is connected to the main part 461X only at the upper end of the first surface 460A. The movable part 462Y is connected to the main part 462X only at the lower end of the first surface 460A. The main parts 461X and 462X and the movable parts 461Y and 462Y may be integrally formed, or may be separately formed and joined.

[0123] The shape of the movable parts 461Y and 462Y can be arbitrarily selected as long as it is a shape that can be movable relative to the main parts 461X and 462X. In the third modified example, the movable parts 461Y and 462Y are in the shape of a triangular prism extending in the LR direction. In the LR direction, the relationship between the length of the movable parts 461Y and 462Y and the length of the main parts 461X and 462X can be arbitrarily selected. In the third modified example, in the LR direction, the length of the movable parts 461Y and 462Y is substantially equal to the length of the main parts 461X and 462X. In the LR direction, the length of the movable parts 461Y and 462Y can also be shorter than the length of the main parts 461X and 462X. The movable parts 461Y and 462Y only need to be provided in at least one of the corners of the main parts 461X and 462X in the first surface 460A.

[0124] The upper surface 461YX of the movable portion 461Y is bonded, for example, by heat sealing to the exterior film 50. The lower surface 462YX of the movable portion 462Y is bonded, for example, by heat sealing to the exterior film 50. In the power storage device 410 of the third modification, the terminal sealing portion 90 can also be omitted.

[0125] <4-2. Functions and effects of power storage devices>

[0126] According to the power storage device 410 of the third modification, in addition to the same operations and effects as those of the power storage device 10 of the embodiment, the following operations and effects can be obtained.

[0127] like Fig.11As shown, the storage device 410 generates at least one of gas and expansion of the electrode body 20 due to long-term use, thereby sometimes the internal pressure of the outer body 40 rises. In a typical example, the outer body 40 and the electrode body 20 expand greatly in the UD direction. For example, the outer film 50 is pressed by the electrode body 20 due to the expansion of the electrode body 20. The upper surface 461YX of the movable part 461Y is bonded to the outer film 50. Therefore, as the internal pressure of the outer body 40 rises, the movable part 461Y rotates relative to the main body 461X in a manner separated from the first surface 460A with the upper end of the first surface 460A as the rotation center. The lower surface 462YX of the movable part 462Y is bonded to the outer film 50. Therefore, as the internal pressure of the outer body 40 rises, the movable part 462Y rotates relative to the main body 462X in a manner separated from the first surface 460A with the lower end of the first surface 460A as the rotation center. According to the power storage device 410 , even when the internal pressure of the exterior body 40 increases, it is possible to suppress the exterior film 50 from being peeled off from the reinforcing member 460 .

[0128] [5. Fourth Modification of Implementation Example]

[0129] The power storage device 510 of the fourth modified example (hereinafter referred to as the "fourth modified example") of the embodiment is different from the embodiment in that it includes a reinforcing member 560, and the other structures are the same as the embodiment. The power storage device 510 of the fourth modified example will be described below, focusing on the parts that are different from the embodiment.

[0130] <5-1. Structure of power storage device>

[0131] Fig.12 It is a perspective view of a reinforcing member 560 included in an electric storage device 510 according to a fourth modification. Fig.13 is a cross-sectional view of the power storage device 510 .

[0132] like Fig.12 As shown, the reinforcing member 560 is, for example, plate-shaped and has a first surface 560A facing the electrode body 20 , a second surface 560B opposite to the first surface 560A, and a side surface 560C connecting the first surface 560A and the second surface 560B.

[0133] A hole 560X penetrating the first surface 560A and the second surface 560B is formed in the center of the reinforcing member 560. The size of the hole 560X is slightly larger than the electrode terminal 30. In the fourth modification, in the fourth step (see Figure 6), the electrode terminal 30 connected to the electrode body 20 is inserted into the hole 560X of the reinforcing member 560. In the fourth modification, when a gap is generated between the adhesive film 31 and the hole 560X, the gap is preferably filled with a resin material such as hot melt or welding. In addition, in the storage device 510 of the fourth modification, the terminal sealing portion 90 can also be omitted.

[0134] According to the fourth modified example, the same operation and effect as the embodiment of the power storage device 10 can be obtained. Furthermore, according to the power storage device 510, since the reinforcing member 560 is not divided, the strength of the reinforcing member 560 is high. Therefore, even when stress acts on the reinforcing member 560 due to vibration or the like, it is possible to suppress the reinforcing member 560 from being damaged.

[0135] [6. Fifth Modification of Implementation Example]

[0136] The power storage device 610 of the fifth modification example (hereinafter referred to as the "fifth modification example") of the embodiment is different from the embodiment in that it includes a reinforcing member 660, and the other structures are the same as the embodiment. The power storage device 610 of the fifth modification example will be described below, focusing on the parts that are different from the embodiment.

[0137] <6-1. Structure of power storage device>

[0138] Fig.14 It is a perspective view of a reinforcing member 660 included in an electric storage device 610 according to a fifth modification. Fig.15 is a cross-sectional view of the power storage device 610 .

[0139] like Fig.14 As shown, the reinforcing member 660 is a frame having a first surface 660A facing the electrode body 20 , a second surface 660B opposite to the first surface 660A, and a side surface 660C connecting the first surface 660A and the second surface 660B.

[0140] A hole 660X penetrating the first surface 660A and the second surface 660B is formed in the center of the reinforcing member 660. The size of the hole 660X is sufficiently large relative to the electrode terminal 30. The inside of the hole 660X forms a space 660Y in which at least a part of the current collector 20X is arranged. In the fifth modification, substantially the entirety of the current collector 20X is arranged in the space 660Y.

[0141] In the fifth modification, in the fourth step (see Figure 6), the electrode terminal 30 connected to the electrode body 20 is inserted into the hole 660X of the reinforcing member 660. In the fifth modification, the hole 660X is sufficiently large relative to the electrode terminal 30, so that in the fourth step, the reinforcing member 660 and the electrode terminal 30 are not joined. Therefore, in the second step (refer to Figure 6 ), it is preferred that the adhesive film 31 be bonded only to the portion of the electrode terminal 30 that is bonded to the exterior film 50. In addition, in the power storage device 610 of the fifth modification, the terminal sealing portion 90 can also be omitted.

[0142] <6-2. Functions and effects of power storage devices>

[0143] According to the fifth modified example, the same operation and effect as the power storage device 10 of the embodiment can be obtained. Furthermore, according to the power storage device 610, since at least a part of the current collector 20X is accommodated in the space 660Y of the reinforcing member 660, the distance between the reinforcing member 660 and the electrode body 20 in the FB direction can be shortened. Therefore, the power storage device 610 can be configured to be compact.

[0144] [7. Sixth Modification of Implementation Example]

[0145] The power storage device 710 of the sixth modification of the embodiment (hereinafter referred to as the "sixth modification") is different from the embodiment in that it includes a reinforcing member 760, and the other structures are the same as the embodiment. The power storage device 710 of the sixth modification will be described below, focusing on the parts that are different from the embodiment.

[0146] <7-1. Structure of power storage device>

[0147] Fig.16 It is a cross-sectional view of the energy storage device 710 of the sixth variant. The reinforcing member 760 has a divided first member 761 and a second member 762. The reinforcing member 760 is a cover that seals the side of the electrode body 20. According to the shape of the reinforcing member 760, stress is concentrated on the interface between the reinforcing member 760 and the electrode body 20, and the outer film 50 may be damaged. In the case where the outer film 50 is damaged, the electrode body 20 cannot be properly sealed. The energy storage device 710 of the sixth variant is configured to be able to properly seal the electrode body 20. The first member 761 is arranged above the second member 762. The reinforcing member 760 has a first surface 760A facing the electrode body 20 when the first member 761 and the second member 762 are combined, a second surface 760B opposite to the first surface 760A, and a side surface 760C connecting the first surface 760A and the second surface 760B.

[0148] The first component 761 includes a main body 761X and an extension 761Y extending from the main body 761X toward the electrode body 20. The second component 762 includes a main body 762X and an extension 762Y extending from the main body 762X toward the electrode body 20. The main bodies 761X and 762X constitute the first surface 760A, the second surface 760B, and the side surface 760C. The main bodies 761X and 762X and the extensions 761Y and 762Y may be integrally formed or may be separately formed and joined.

[0149] The extension portion 761Y extends from a portion including the upper end of the first surface 760A toward the electrode body 20. The extension portion 761Y is a shape in which the front end becomes thinner as it approaches the electrode body 20. Preferably, the upper surface 761YX of the extension portion 761Y is bonded to the outer film 50, for example, by heat bonding. Since a larger range of the reinforcing member 760 is bonded to the outer film 50, the reinforcing member 760 is more firmly bonded to the outer film 50. The upper surface 761YX may not be bonded to the outer film 50. The front end of the extension portion 761Y covers a portion of the electrode body 20.

[0150] The extension portion 762Y extends from a portion including the lower end of the first surface 760A toward the electrode body 20. The extension portion 762Y is shaped such that the front end becomes thinner as it goes toward the electrode body 20. Preferably, the lower surface 762YX of the extension portion 762Y is joined to the outer film 50, for example, by heat treatment. Since a larger range of the reinforcing member 760 is joined to the outer film 50, the reinforcing member 760 is more firmly joined to the outer film 50. The lower surface 762YX may not be joined to the outer film 50. The front end of the extension portion 762Y covers a portion of the electrode body 20.

[0151] In the LR direction, the relationship between the length of the extension parts 761Y, 762Y and the length of the main parts 761X, 762X can be arbitrarily selected. In the sixth modification, in the LR direction, the length of the extension parts 761Y, 762Y is substantially equal to the length of the main parts 761X, 762X. In the LR direction, the length of the extension parts 761Y, 762Y can also be shorter than the length of the main parts 761X, 762X. In addition, in the storage device 710 of the sixth modification, the terminal sealing part 90 can also be omitted.

[0152] <7-2. Functions and effects of power storage devices>

[0153] According to the sixth modified example, the same operation and effect as the embodiment of the power storage device 10 can be obtained. In addition, according to the power storage device 710, the extensions 761Y and 762Y become thinner as they go toward the electrode body 20, so that stress concentration on the interface between the reinforcing member 760 and the electrode body 20 can be suppressed. Therefore, damage to the outer film 50 can be suppressed.

[0154] [8. Seventh Modification of Implementation Example]

[0155] The power storage device 810 of the seventh variant of the embodiment (hereinafter referred to as the "seventh variant") is different from the embodiment in that it includes a buffer film 820, and the other structures are the same as the embodiment. The power storage device 810 of the seventh variant will be described below, focusing on the parts that are different from the embodiment.

[0156] <8-1. Structure of power storage device>

[0157] Fig.17 It is a cross-sectional view of the energy storage device 810 of the 7th variant. When the strength of the outer film 50 is low, pinholes may be generated in the outer film 50. When pinholes are generated in the outer film 50, the electrode body 20 cannot be properly sealed. The energy storage device 810 of the 7th variant is configured to be able to properly seal the electrode body 20. The energy storage device 810 has a buffer film 820 for improving the strength of the outer film 50. The buffer film 820 is arranged on the inner side of the outer film 50. In order to suppress the generation of pinholes in the outer film 50, the buffer film 820 is arranged at least one of the corners of the electrode body 20 and the corners of the reinforcing member 60. In the 7th variant, the buffer film 820 is arranged at all corners of the electrode body 20 and all corners of the reinforcing member 60. The material constituting the buffer film 820 is, for example, a polyester material, a polyolefin material, or a fluorine material. In addition, in the energy storage device 810 of the 7th variant, the terminal sealing portion 90 can also be omitted.

[0158] <8-2. Functions and effects of power storage devices>

[0159] The power storage device 810 of the seventh modification can achieve the same operation and effect as the power storage device 10 of the embodiment. Furthermore, the power storage device 810 has the buffer film 820, so that the strength of the exterior film 50 is improved. Therefore, the generation of pinholes in the exterior film 50 can be suppressed.

[0160] [9. Eighth Modification of Implementation Example]

[0161] The storage device 910 of the eighth modification of the embodiment (hereinafter referred to as the "eighth modification") is different from the embodiment in that it includes an outer film 950, and the other structures are the same as the embodiment. The storage device 910 of the eighth modification will be described below, focusing on the parts that are different from the embodiment.

[0162] <9-1. Structure of power storage device>

[0163] Fig.18It is a cross-sectional view of an electrical storage device 910 of the eighth variant. The electrical storage device 910 includes an outer film 950. When the internal pressure of the outer casing 40 rises, the outer film 950 may be peeled off from the reinforcing member 60. When the outer film 950 is peeled off from the reinforcing member 60, the electrode body 20 cannot be properly sealed. The electrical storage device 910 of the eighth variant is configured to be able to properly seal the electrode body 20. The outer film 950 has an expansion portion 951 located between the electrode body 20 and the reinforcing member 60. The expansion portion 951 is configured to be able to bulge when the outer casing 40 expands as the internal pressure of the outer casing 40 rises. The shape of the expansion portion 951 can be arbitrarily selected as long as it is a shape that can bulge. In the eighth variant, the expansion portion 951 is a curved shape that is recessed toward the electrode terminal 30. The expansion portion 951 can be a corner that is recessed toward the electrode terminal 30, or it can be a corrugated shape. The swollen portion 951 does not need to be recessed, and may be a portion that is flexible to the extent that it can swell. In the power storage device 910 of the eighth modification, the terminal sealing portion 90 may also be omitted.

[0164] <9-2. Functions and effects of power storage devices>

[0165] According to the eighth modified example, the same operation and effect as the embodiment of the power storage device 10 can be obtained. Furthermore, according to the power storage device 910, since the outer film 50 has the expansion portion 951, even when the internal pressure of the outer body 40 increases, the outer film 950 can be prevented from peeling off from the reinforcing member 60.

[0166] [10. Other Modifications]

[0167] The above-mentioned embodiments and various modified examples are examples of the possible forms that the power storage device, reinforcement component and method for manufacturing the power storage device of the present invention can adopt, and are not intended to limit their forms. The power storage device, reinforcement component and method for manufacturing the power storage device of the present invention can adopt forms different from the forms illustrated in the embodiments and various modified examples. One example is a form in which a part of the structure of the embodiments and various modified examples is replaced, changed or omitted, or a form in which a new structure is added to the embodiments and various modified examples. Several examples of other modified examples of the embodiments and various modified examples are shown below. In addition, the above-mentioned embodiments and various modified examples, as well as the following other modified examples, can be combined with each other as long as they are not technically contradictory.

[0168] <10-1>

[0169] In the power storage device 10 of the embodiment, the reinforcing member 60 may not be divided into the first member 61 and the second member 62. Figure 6In the manufacturing method of the power storage device 10 shown in the figure, the first step may be omitted, and in the fourth step, the reinforcing member 60 is insert-molded in the electrode terminal 30 in a state connected to the electrode body 20 (the reinforcing member 60 is configured in an insert-molded manner). In addition, in the fourth step, a heat insulating material for protecting the electrode body 20 is preferably configured between the electrode body 20 and the portion where the reinforcing member 60 is formed. The heat insulating material is preferably removed after the fourth step. This modification can also be applied to the fourth modification in the same manner.

[0170] <10-2>

[0171] In the power storage device 10 of the embodiment, one of the two electrode terminals 30 may not be bonded to the outer film 50. In other words, one of the two electrode terminals 30 may not have the terminal sealing portion 90. For example, one of the two electrode terminals 30 that does not have the terminal sealing portion 90 may have the second sealing portion 80. In short, the power storage device 10 may have at least one terminal sealing portion 90. In addition, with respect to the first to eighth modified examples, the two terminal sealing portions 90 may be omitted.

[0172] <10-3>

[0173] In the power storage device 10 of the embodiment, the two electrode terminals 30 may protrude from one of the two reinforcing members 60. In this modification, in the outer casing 40, the portion where the other reinforcing member 60 is arranged can be sealed by a known method. For example, the portion where the other reinforcing member 60 is arranged may be sealed by a known reinforcing member composed of one member, or the other reinforcing member 60 may be omitted and the electrode body 20 may be sealed by folding the outer film 50. This modification can also be applied to the first modification to the eighth modification in the same manner.

[0174] <10-4>

[0175] In the power storage device 10 of the embodiment, the outer film 50 may be a laminate (laminated film) having a heat-fusible resin layer 53 on both sides of the barrier layer 52. In this modification, the first sealing portion 70 may be formed by heat-sealing the heat-fusible resin layers 53 laminated on one side or the other side relative to the barrier layer 52, or may be formed by heat-sealing the heat-fusible resin layer 53 laminated on one side relative to the barrier layer 52 and the heat-fusible resin layer 53 laminated on the other side. In this modification, the root 70X of the first sealing portion 70 is located on any surface of the outer body 40. In this modification, the root 70X of the first sealing portion 70 is preferably located near the edge 43 of the boundary between the first surface 41 and the second surface 42. In this modification, the heat-fusible resin layer 53 may also be bonded to the barrier layer 52 via an adhesive layer 55, for example. This modification can also be applied to the first to eighth modifications in the same manner.

[0176] <10-5>

[0177] In the power storage device 10 of the embodiment, the outer shape of the outer casing 40 can be arbitrarily changed. Fig.19 It is a top view of an electric storage device 10 according to a modification. Fig. 20 yes Fig.19 1 is a side view of the power storage device 10.

[0178] In the power storage device 10 of this modification, the outer film 50 is wound around the electrode body 20 in a manner having an extension portion 70Y extending outward from the electrode body 20. In a state where the outer film 50 is wound around the electrode body 20 in a manner having the extension portion 70Y, the mutually facing surfaces (thermo-fusible resin layers 53) of the outer film 50 are heat-sealed to each other, thereby forming a sealing portion 60Y. In this modification, the extension portion 70Y includes a first extension portion 71Y and a second extension portion 72Y. The electrode body 20 and the reinforcing member 60 are located between the first extension portion 71Y and the second extension portion 72Y.

[0179] The first extension portion 71Y is opposite to the second extension portion 72Y via the electrode body 20 and the reinforcing member 60. The first extension portion 71Y has a pair of side portions 71A and 71B in the short side direction of the outer body 40 when viewed from above. The second extension portion 72Y has a pair of side portions 72A and 72B in the short side direction of the outer body 40 when viewed from above. In this modification, the side portions 71A, 71B, 72A, and 72B are folded inwardly in a manner that the heat-fusible resin layer (inner surface) of the outer film 50 is opposite to each other. In other words, the side portions 71A, 71B, 72A, and 72B are folded inwardly in a manner that the base material layer 51 (outer surface) of the outer film 50 is opposite to each other. In this modification, the outer body 40 is a so-called gable top type bag.

[0180] The sealing portion 60Y includes a first extending sealing portion 91Y and a second extending sealing portion 92Y. The first extending sealing portion 91Y is formed on the first extending portion 71Y. The first extending sealing portion 91Y extends in the short side direction of the outer body 40. The first extending sealing portion 91Y includes a pair of side sealing portions 91YA and a central sealing portion 91YB. The pair of side sealing portions 91YA are portions where the heat-fusible resin layers 53 in the folded pair of side portions 71A and 71B are heat-sealed to each other. The central sealing portion 91YB is a portion located between the pair of side sealing portions 91YA. The central sealing portion 91YB is sealed while sandwiching the electrode terminal 30. The portion where the first extending portion 71Y in the outer film 50 is joined to the electrode terminal 30 constitutes the terminal sealing portion 90.

[0181] The second extended seal portion 92Y is formed in the second extended portion 72Y. The second extended seal portion 92Y extends in the short side direction of the outer body 40. The second extended seal portion 92Y includes a pair of side seal portions 92YA and a central seal portion 92YB. The pair of side seal portions 92YA are portions where the heat-fusible resin layers in the pair of side portions 72A and 72B after folding are heat-sealed to each other. The central seal portion 92YB is a portion located between the pair of side seal portions 92YA. The central seal portion 92YB is sealed in a state where two electrode terminals 30 are sandwiched. The portion where the second extended portion 72Y in the outer film 50 is joined to the electrode terminal 30 constitutes the terminal seal portion 90.

[0182] Fig.21 1 is a top view of an electric storage device 10 according to another variation of the embodiment. The electric storage device 10 according to this variation has an extension portion 270Y. The extension portion 270Y includes a first extension portion 271Y and a second extension portion 272Y that are opposite to each other with the electrode body 20 and the reinforcing member 60 interposed therebetween. The first extension portion 271Y has a pair of side portions 271A and 271B in the short side direction of the outer casing 40 when viewed from above. The second extension portion 272Y has a pair of side portions 272A and 272B in the short side direction of the outer casing 40 when viewed from above. In this variation, the side portions 271A, 271B, 272A, and 272B are arranged in a direction opposite to the electrode body 20 and the reinforcing member 60. Fig.19 Unlike the modified example shown in FIG. 1 , the outer film 50 is not folded inwardly so that the inner surfaces of the outer film 50 face each other. The width XA of the extended portion 270 in the expanded state is wider than the width XB of the electrode body 20. In this modified example, the outer body 40 is a so-called square-shaped bag.

[0183] The extended seal portion 290Y includes a first extended seal portion 291Y and a second extended seal portion 292Y. The first extended seal portion 291Y is formed on the first extended portion 271Y. The first extended seal portion 291 extends in the short side direction of the outer body 40. The first extended seal portion 291Y includes a pair of side seal portions 291A and a central seal portion 291B. The pair of side seal portions 291A are portions where the heat-fusible resin layers 53 of the outer film 50 located outside the end portion in the width direction of the electrode body 20 are heat-sealed to each other. The central seal portion 291B is a portion located between the pair of side seal portions 291A. The central seal portion 291B is sealed while sandwiching the electrode terminal 30. The portion where the first extended portion 271Y in the outer film 50 is joined to the electrode terminal 30 constitutes the terminal seal portion 90.

[0184] The second extended seal portion 292Y is formed in the second extended portion 272Y. The second extended seal portion 292Y extends in the short side direction of the outer casing 40. The second extended seal portion 292Y includes a pair of side seal portions 292A and a central seal portion 292B. The pair of side seal portions 292A are portions where the heat-fusible resin layers 53 of the outer casing 50, which are located outside the end portions in the width direction of the electrode body 20, are heat-sealed to each other. The central seal portion 292B is a portion located between the pair of side seal portions 292A. The central seal portion 292B is sealed while sandwiching two electrode terminals 30. The portion where the second extended portion 272Y in the outer casing 50 is joined to the electrode terminal 30 constitutes the terminal seal portion 90. In addition, Figure 19 to Figure 21 The related modification examples can also be applied similarly to the first modification examples to the eighth modification examples.

[0185] <10-6>

[0186] In the power storage device 10 of the embodiment, the electrode assembly 20 and the reinforcing member 60 are packaged by winding one outer film 50, but may be packaged by joining two or more outer films 50. This modification is also applicable to the first to eighth modifications.

[0187] <10-7>

[0188] In the power storage device 10 of the embodiment, in order to more appropriately join the reinforcing member 60 and the outer film 50, the reinforcing member 60 and the outer film 50 may be joined via an adhesive film. The specification of the adhesive film of this modification is the same as that of the adhesive film 31. In particular, when the material constituting the reinforcing member 60 includes metal, the reinforcing member 60 and the outer film 50 are preferably joined via the adhesive film. This modification can also be similarly applied to the first modification to the eighth modification.

[0189] <10-8>

[0190] In the power storage device 10 of the embodiment, the reinforcing member 60 is made of a resin material, but the reinforcing member 60 may be made of other materials. The reinforcing member 60 may be made of, for example, ceramics or glass. Examples of ceramics include alumina, zirconium oxide, silicon carbide, forsterite, silicon nitride, steatite, cordierite, sialon, ferrite, barium titanate, and mullite.

[0191] Description of Reference Numerals

[0192] 10, 210, 310, 410, 510, 610, 710, 810, 910: power storage devices

[0193] 20: Electrode body

[0194] 20X: Current Collector

[0195] 30: Electrode terminal

[0196] 30A: Exposed part

[0197] 50, 950: Exterior film

[0198] 60, 260, 360, 460, 560, 660, 760: Reinforced parts

[0199] 61, 261, 361, 461, 761: Part 1

[0200] 62, 262, 362, 462, 762: Part 2

[0201] 260X: Concave

[0202] 360B: Side 2

[0203] 461X, 462X: Main body

[0204] 461Y, 462Y: Movable parts

[0205] 560X, 660X: hole

[0206] 660Y: Space

[0207] 761X, 762X: Main body

[0208] 761Y, 762Y: Extension

[0209] 820: Buffering film

[0210] 951: Expansion section.

Claims

1. An electric storage device, comprising: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on the side of the electrode body; and An outer film for packaging the electrode body and the reinforcing member, The electrode terminal has an exposed portion, and the exposed portion is a portion exposed to the outside on the opposite side of the electrode body with respect to the reinforcing member. A portion of the exposed portion is bonded to the exterior film.

2. The power storage device according to claim 1, wherein The reinforcing member includes at least a first member and a second member that are divided.

3. The power storage device according to claim 1 or 2, wherein: The electrode body includes a current collector, The reinforcing member has a recessed portion for accommodating the current collector.

4. The power storage device according to claim 1 or 2, wherein: The electrode body includes a current collector, The reinforcing member is a frame having a space in which the current collector is arranged.

5. The power storage device according to claim 1 or 2, wherein: The reinforcing member is in a plate shape and has a hole into which the electrode terminal is inserted.

6. The power storage device according to claim 1 or 2, wherein: The reinforcing component comprises: the main body; and a movable part connected to the main body and joined to the outer film, The movable portion is configured to be movable relative to the main body portion when the exterior film expands as the internal pressure of the electricity storage device increases.

7. The power storage device according to claim 1 or 2, wherein: The reinforcing component comprises: A first surface facing the electrode body; and a second surface, which is connected to the first surface and extends in a direction opposite to the electrode body, The second surface is inclined toward a center in a height direction of the reinforcing member as it goes in a direction opposite to the electrode body.

8. The power storage device according to claim 1 or 2, wherein: The reinforcing component comprises: the main body; and an extension portion extending from the main body portion toward the electrode body, The extension portion tapers toward the electrode body.

9. The power storage device according to claim 1 or 2, wherein: A buffer film is provided inside the outer film to improve the strength of the outer film. The buffer film is disposed at at least one of a corner portion of the electrode body and a corner portion of the reinforcing member.

10. The power storage device according to claim 1 or 2, wherein: The electrode body and the reinforcing member are arranged at a distance from each other. The outer film has a swollen portion located between the electrode body and the reinforcing member. The expansion portion is configured to be able to swell when the exterior film expands as the internal pressure of the electricity storage device increases.

11. An electric storage device comprising: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on the side of the electrode body; and An outer film for packaging the electrode body and the reinforcing member, The reinforcing component comprises: Main body; and a movable part connected to the main body and joined to the outer film, The movable portion is configured to be movable relative to the main body portion when the exterior film expands as the internal pressure of the electricity storage device increases.

12. An electric storage device comprising: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on the side of the electrode body; and An outer film for packaging the electrode body and the reinforcing member, The reinforcing component comprises: A first surface facing the electrode body; and a second surface, which is connected to the first surface and extends in a direction opposite to the electrode body, The second surface is inclined toward a center in a height direction of the reinforcing member as it goes in a direction opposite to the electrode body.

13. An electric storage device comprising: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on the side of the electrode body; and An outer film for packaging the electrode body and the reinforcing member, The reinforcing component comprises: Main body; and an extension portion extending from the main body portion toward the electrode body, The extension portion tapers toward the electrode body.

14. An electric storage device comprising: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on the side of the electrode body; and an outer film for packaging the electrode body and the reinforcing member, a buffer film disposed inside the outer film to increase the strength of the outer film; The buffer film is disposed at at least one of a corner portion of the electrode body and a corner portion of the reinforcing member.

15. An electric storage device comprising: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on the side of the electrode body; and An outer film for packaging the electrode body and the reinforcing member, The electrode body and the reinforcing member are arranged at a distance from each other. The outer film has a swollen portion located between the electrode body and the reinforcing member. The expansion portion is configured to be able to swell when the exterior film expands as the internal pressure of the electricity storage device increases.

16. The power storage device according to any one of claims 11 to 15, wherein The reinforcing member includes at least a first member and a second member that are divided.

17. The power storage device according to any one of claims 11 to 15, wherein The electrode body includes a current collector, The reinforcing member has a recessed portion for accommodating the current collector.

18. The power storage device according to any one of claims 11 to 15, wherein The reinforcing member is in a plate shape and has a hole into which the electrode terminal is inserted.

19. A reinforcing member used for the power storage device according to claim 1, 2, 11, 12, 13, 14 or 15.

20. The reinforcement member according to claim 19, wherein The reinforcing member is joined to the electrode terminal.

21. A method for manufacturing an electric storage device, wherein: The power storage device comprises: Electrode body; an electrode terminal electrically connected to the electrode body; a reinforcing member disposed on a side of the electrode body; and An outer film for packaging the electrode body and the reinforcing member, The electrode terminal has an exposed portion, and the exposed portion is a portion exposed to the outside on the opposite side of the electrode body with respect to the reinforcing member. A portion of the exposed portion is bonded to the exterior film, The method for manufacturing the power storage device comprises: A connecting step of electrically connecting the electrode body to the electrode terminal; a disposing step, performed after the connecting step, of disposing the reinforcing member so as to form the exposed portion; a packaging step of packaging the reinforcing member and the electrode body with the exterior film, which is performed after the arranging step; and A sealing step of bonding the exterior film to the exposed portion is performed after the packaging step.

22. The method for manufacturing an electric storage device according to claim 21, wherein: In the arrangement step, the reinforcing member is arranged by insert molding the electrode terminal in a state of being connected to the electrode body.

Images