All-solid battery and manufacturing method of the all-solid battery

Abstract

To improve an impact resistance of a battery formation body housed in a battery can, and contribute to "Goal 9: Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation" in SDGs.SOLUTION: An all-solid battery 1A comprises: a battery formation body 20 that has a positive electrode 201, a negative electrode 202, and a solid electrolyte layer 203 interposed between the positive electrode 201 and the negative electrode 202; an elastic member 70 that has a side surface 702 as a coated surface coating at least a side surface of a battery assembly 29 in which a positive electrode power supply board 30 and a negative electrode power supply board are attached to the battery formation body 20; a battery can 10 of a conductive material that houses the battery assembly 29 coated with the elastic member 70; and a can lid part 51 that seals one end of the battery can 10.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present disclosure relates to an all-solid-state battery and a method for manufacturing an all-solid-state battery. [Background technology]

[0002] 2. Description of the Related Art In recent years, with the development of portable electronic devices such as mobile phones and notebook computers, and the practical application of electric vehicles, there is an increasing need for small, lightweight, high-capacity and high-energy density secondary batteries.

[0003] Conventionally, lithium secondary batteries, particularly lithium ion secondary batteries, have been used as secondary batteries that meet this need. However, lithium ion batteries contain an organic solvent, which is a flammable material, as a non-aqueous electrolyte. In addition, the development of the above-mentioned devices and electric vehicles, etc. has led to an increase in the energy density of lithium ion secondary batteries, and the amount of organic solvent, which is a flammable material, is also on the rise. As a result, even greater reliability is required of lithium ion secondary batteries.

[0004] In this situation, all-solid-state lithium secondary batteries (all-solid-state secondary batteries) that do not use organic solvents have been attracting attention. All-solid-state secondary batteries use a molded body of a solid electrolyte that does not use an organic solvent instead of a conventional organic solvent-based electrolyte. In all-solid-state secondary batteries, a positive electrode layer, a negative electrode layer, and a solid electrolyte layer are stacked together to form a laminate.

[0005] Patent Document 1 discloses a battery in which a laminate is housed in a space formed by a case and a lid. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-253287 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, there is a risk that the laminate formed by compression molding of the powder material may be damaged, such as cracked, by an impact applied to the battery case. [Means for solving the problem]

[0008] A brief outline of a representative embodiment of the present invention will be described below.

[0009] An all-solid-state battery according to one embodiment includes a battery molded body having a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode, a positive electrode power supply plate connected to the positive electrode of the battery molded body, a negative electrode power supply plate connected to the negative electrode of the battery molded body, an elastic member having a covering surface covering at least a side surface of a cell assembly in which the positive electrode power supply plate and the negative electrode power supply plate are attached to the battery molded body, a battery can that houses the cell assembly covered by the elastic member, and a can lid portion that seals one end of the battery can in an extension direction in which the battery can extends.

[0010] A method for manufacturing an all-solid-state battery according to one embodiment includes a first step of manufacturing a laminate having a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode, a positive electrode tab connected to the positive electrode, and a negative electrode tab connected to the negative electrode, and attaching the positive electrode tab to the positive electrode of the laminate and the negative electrode tab to the negative electrode of the laminate to manufacture a battery molded body; a second step of stacking a plurality of the battery molded bodies to which the positive electrode tab and the negative electrode tab are attached, and attaching a positive electrode power supply plate and a negative electrode power supply plate to the positive electrode tab and the negative electrode tab attached to each of the plurality of battery molded bodies to manufacture a cell assembly; a third step of covering at least a side surface of the cell assembly with an elastic member; a fourth step of housing the cell assembly covered with the elastic member in a battery can; and a fifth step of attaching a can lid portion to one end of the battery can in an extension direction of the battery can. Effect of the Invention

[0011] According to one embodiment, it is possible to improve the impact resistance of the battery molded body housed in the battery can. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is an external perspective view of an all-solid-state battery according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the all-solid-state battery taken along line AA in FIG. [Diagram 3] FIG. 2 is a cross-sectional view of the all-solid-state battery taken along line BB in FIG. [Figure 4] FIG. [Diagram 5] 11A to 11C are diagrams illustrating a process of housing a cell assembly in a battery can. [Figure 6] FIG. 2 is a diagram illustrating the structure of an individual battery molded body. [Figure 7] FIG. 2 is an external perspective view of a cell assembly. [Figure 8] FIG. 2 is an external perspective view of a cell assembly to which a positive power supply plate and a negative power supply plate are attached. [Figure 9] 4A and 4B are diagrams illustrating the structure of the can lid portion. [Figure 10] FIG. 11 is an external perspective view of an all-solid-state battery according to a second embodiment. [Figure 11] FIG. 11 is a cross-sectional view of the all-solid-state battery taken along line DD in FIG. [Figure 12] FIG. [Figure 13] 13A to 13C are diagrams illustrating a process of housing the battery assembly in an elastic member. [Figure 14] 11A to 11C are diagrams illustrating a process of housing a battery assembly housed in an elastic member into a battery can. [Figure 15] FIG. 11 is an exploded perspective view illustrating the structure of a can lid portion of a second embodiment. [Figure 16] 4 is a cross-sectional view illustrating the attachment of the can lid to the battery can. FIG. [Figure 17] 1 is a flowchart illustrating a method for manufacturing an all-solid-state battery. [Figure 18]FIG. 13 is an external perspective view of an elastic member according to a first modified example. [Figure 19] FIG. 13 is an external perspective view of an elastic member according to a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same parts are generally designated by the same reference numerals, and repeated explanations will be omitted. In the drawings, the representation of components may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention.

[0014] <First embodiment> An all-solid-state battery according to a first embodiment of the present disclosure will be described below with reference to the drawings. FIG. 1 is an external perspective view of an all-solid-state battery 1 according to the first embodiment. FIG. 2 is a cross-sectional view of the all-solid-state battery 1 taken along line AA in FIG. 1. FIG. 3 is a cross-sectional view of the all-solid-state battery 1 taken along line BB in FIG. 1. In the following description of the embodiment, the term "all-solid-state battery" is used, but instead of this term, it may be expressed as a stacked solid-state battery, a battery module, or the like.

[0015] The all-solid-state battery 1 includes a battery can 10, a battery molded body 20, a positive electrode power supply plate 30, a negative electrode power supply plate 40, and a can lid portion 50.

[0016] <Battery can 10> The battery can 10 has a cylindrical shape with one side open and the other side closed. Specifically, as shown in the figure, the battery can 10 is a cylindrical can formed in a cylindrical shape with a bottom. The inside of the battery can 10 contains a battery molded body 20, a positive electrode power supply plate 30, and a negative electrode power supply plate 40, which will be described in detail later.

[0017] The battery can 10 is not limited to being a cylindrical can, but may be a square tubular can having a rectangular cross section, depending on the shape of the battery molded body 20 housed therein.

[0018] The battery can 10 has a bottom surface 101 and a side surface 102. The side surface 102 is connected to the bottom surface 101 and extends in a direction intersecting the bottom surface 101, in the height direction or the width direction depending on the placement, and more specifically in a direction perpendicular to the bottom surface 101. In the following description, the direction in which the side surface 102 extends, i.e., the direction in which the battery can 10 extends, is referred to as the extension direction A1. In addition, the base side of the extension direction A1 shown in the figure (i.e., the bottom surface 101 side of the battery can 10) may be referred to as the lower side, and the tip side (i.e., the side away from the bottom surface 101 of the battery can 10) may be referred to as the upper side.

[0019] The battery can 10 is formed of a conductive material, for example, a metal material such as aluminum, stainless steel, a nickel alloy, etc. When the battery can 10 is electrically connected to a negative electrode or a positive electrode described below, the material of the battery can 10 is preferably selected so as to prevent corrosion of the battery can 10 or deterioration of the material due to alloying with lithium ions.

[0020] A plurality of recesses 104 extending upward from the lower end along the extension direction A1 are formed on the outer peripheral surface of the side surface 102 of the battery can 10 by, for example, pressing. Therefore, as shown in Fig. 3, protrusions 103 protruding toward the inside of the battery can 10 are formed on the inner peripheral surface of the side surface 102 of the battery can 10 at positions where the recesses 104 are formed. When the battery molded body 20 described below is accommodated inside the battery can 10, the protrusions 103 come into contact with the side surface of the battery molded body 20. This suppresses vibration of the battery molded body 20 inside the battery can 10.

[0021] The protrusion 103 does not have to be formed on the inner circumferential surface of the side surface 102 of the battery can 10. In this case, the battery molded body 20 and the inner circumferential surface of the side surface 102 of the battery can 10 may be fixed by adhesion. Alternatively, a seal member or the like made of a non-conductive material such as a resin material may be disposed in the gap between the battery molded body 20 and the inner circumferential surface of the side surface 102 of the battery can 10 to fill the gap.

[0022] <Battery molded body 20> As shown in Fig. 2, the all-solid-state battery 1 of this embodiment has four battery formed bodies 20. Note that the number of the battery formed bodies 20 is not limited to four, and may be more than four or less than four. In the following description, each battery formed body 20 may be referred to as a cell, and a combination of a plurality of cells may be referred to as a cell assembly 21.

[0023] Each battery formed body 20 is configured as a laminate 211 in which a formed body (layer) of a positive electrode 201, a formed body (layer) of a negative electrode 202, and a solid electrolyte layer 203 are laminated. That is, in the battery formed body 20, the solid electrolyte layer 203 interposed between the positive electrode 201 and the negative electrode 202 is laminated.

[0024] <Positive electrode 201> The positive electrode 201 is a columnar formed body (layer) formed by pressing (pressing) a positive electrode mixture. Note that the positive electrode 201 is not limited to a columnar layer, and may be a prismatic layer. The positive electrode mixture is not particularly limited as long as it is, for example, a positive electrode active material used in a lithium-ion secondary battery, that is, a material capable of occluding and releasing lithium ions. Specifically, LiM x Mn 2-x O 4 (However, M is at least one element selected from the group consisting of Li, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Co, Ni, Cu, Al, Sn, Sb, In, Nb, Mo, W, Y, Ru, and Rh, and 0.01 ≦ x ≦ 0.5) Spinel-type lithium manganese composite oxide represented by, Li x Mn (1-y-x) Ni y M z O (2-k) F l (However, M is at least one element selected from the group consisting of Co, Mg, Al, B, Ti, V, Cr, Fe, Cu, Zn, Zr, Mo, Sn, Ca, Sr, and W, and 0.8 ≦ x ≦ 1.2, 0 < y < 0.5, 0 ≦ z ≦ 0.5, k + l < 1, -0.1 ≦ k ≦ 0.2, 0 ≦ l ≦ 0.1) Layered compound represented by, LiCo 1-x M x O 2(wherein M is at least one element selected from the group consisting of Al, Mg, Ti, Zr, Fe, Ni, Cu, Zn, Ga, Ge, Nb, Mo, Sn, Sb and Ba, and 0≦x≦0.5), lithium cobalt composite oxide represented by the formula LiNi 1-x M x O 2 (wherein M is at least one element selected from the group consisting of Al, Mg, Ti, Zr, Fe, Co, Cu, Zn, Ga, Ge, Nb, Mo, Sn, Sb and Ba, and 0≦x≦0.5), lithium nickel composite oxide represented by LiM 1-x N x PO 4 (wherein M is at least one element selected from the group consisting of Fe, Mn and Co, N is at least one element selected from the group consisting of Al, Mg, Ti, Zr, Ni, Cu, Zn, Ga, Ge, Nb, Mo, Sn, Sb and Ba, and 0≦x≦0.5), Li 4 Ti 5 O 12 Among these, only one type may be used, or two or more types may be used in combination.

[0025] The average particle size of the positive electrode active material is preferably 1 μm or more, more preferably 2 μm or more, and is preferably 10 μm or less, more preferably 8 μm or less. The positive electrode active material may be either primary particles or secondary particles formed by agglomeration of primary particles. When a positive electrode active material having an average particle size in the above range is used, a large interface with the solid electrolyte can be obtained, and thus the load characteristics of the battery are further improved.

[0026] The positive electrode active material preferably has a reaction suppression layer on its surface for suppressing reaction with the solid electrolyte.

[0027] If the positive electrode active material and the solid electrolyte come into direct contact with each other in the positive electrode mixture compact, the solid electrolyte may oxidize to form a resistance layer, which may reduce the ionic conductivity in the compact. By providing a reaction suppression layer that suppresses the reaction with the solid electrolyte on the surface of the positive electrode active material and preventing direct contact between the positive electrode active material and the solid electrolyte, it is possible to suppress the reduction in the ionic conductivity in the compact due to the oxidation of the solid electrolyte.

[0028] The reaction suppression layer may be made of a material that has ion conductivity and can suppress the reaction between the positive electrode active material and the solid electrolyte. Examples of materials that can form the reaction suppression layer include oxides containing Li and at least one element selected from the group consisting of Nb, P, B, Si, Ge, Ti, and Zr, more specifically, LiNbO 3 Nb-containing oxides such as Li 3 PO 4 , Li 3 BO 3 , Li 4 SiO 4 , Li 4 GeO 4 , LiTiO 3 , LiZrO 3 The reaction suppression layer may contain only one of these oxides, or may contain two or more of these oxides, or may contain a composite compound of two or more of these oxides. Among these oxides, it is preferable to use an Nb-containing oxide, and LiNbO 3 It is more preferable to use

[0029] The reaction suppression layer is preferably present on the surface in an amount of 0.1 to 1.0 part by mass per 100 parts by mass of the positive electrode active material, in order to effectively suppress the reaction between the positive electrode active material and the solid electrolyte.

[0030] Methods for forming a reaction suppression layer on the surface of a positive electrode active material include the sol-gel method, the mechanofusion method, the CVD method, the PVD method, and the like. The content of the positive electrode active material in the positive electrode mixture is preferably 60 to 95 mass %.

[0031] Examples of the conductive assistant of the positive electrode 201 include carbon materials such as graphite (natural graphite, artificial graphite), graphene, carbon black, carbon nanofiber, carbon nanotube, etc. The content of the conductive assistant in the positive electrode mixture is preferably 1 to 10 mass %.

[0032] The solid electrolyte of the positive electrode 201 may be one or more of various sulfide-based solid electrolytes, hydride-based solid electrolytes, and oxide-based solid electrolytes, which will be described later as being usable for the negative electrode 202. In order to improve the battery characteristics, it is desirable to contain a sulfide-based solid electrolyte. The content of the solid electrolyte in the positive electrode mixture is preferably 4 to 30 mass %.

[0033] The positive electrode mixture may or may not contain a resin binder. Examples of the resin binder include fluororesins such as polyvinylidene fluoride (PVDF). However, since the resin binder acts as a resistance component in the positive electrode mixture, it is desirable that the amount of the resin binder is as small as possible. Therefore, it is preferable that the positive electrode mixture does not contain a resin binder, or if it does contain one, the content is 0.5 mass% or less. It is more preferable that the content of the resin binder in the positive electrode mixture is 0.3 mass% or less, and even more preferable that it is 0 mass% (i.e., no resin binder is contained).

[0034] When a current collector is used for the positive electrode 201, the current collector can be a foil of a metal such as aluminum or stainless steel, a punched metal, a net, an expanded metal, a foamed metal, a carbon sheet, or the like.

[0035] The positive electrode mixture compact can be formed, for example, by compressing a positive electrode mixture prepared by mixing a positive electrode active material, a conductive assistant, a solid electrolyte, and further a binder added as necessary, by pressure molding or the like.

[0036] In the case of a positive electrode having a current collector, the positive electrode can be produced by bonding a molded body of the positive electrode mixture formed by the above-mentioned method to the current collector by, for example, pressure bonding.

[0037] The thickness of the positive electrode mixture compact (in the case of the positive electrode 201 having a current collector, the thickness of the positive electrode mixture compact per one side of the current collector. The same applies below.) is preferably 200 μm or more from the viewpoint of increasing the capacity of the battery. The thickness of the positive electrode mixture compact is usually 2000 μm or less.

[0038] A positive electrode tab 206 is attached to the positive electrode 201. The positive electrode tab 206 is made of a metal material such as aluminum. The positive electrode tab 206 is joined to a positive electrode power supply plate 30, which will be described later, by welding.

[0039] <Negative electrode 202> The negative electrode 202 is a cylindrical molded body (layer) formed by pressing the negative electrode mixture. The negative electrode is not limited to a cylindrical layer, and may be a prismatic layer. The negative electrode mixture can be formed using a negative electrode active material used in a lithium ion secondary battery. The negative electrode active material is not particularly limited as long as it is a material capable of absorbing and releasing lithium ions, and examples thereof include carbon-based materials capable of absorbing and releasing lithium, such as graphite, pyrolytic carbons, cokes, glassy carbons, baked organic polymer compounds, mesocarbon microbeads (MCMB), and carbon fibers; simple substances or oxides or alloys of elements capable of forming alloys with lithium, such as Si, Sn, Ge, Bi, Sb, and In; nitrides containing lithium and transition metals, such as Co, Ni, Mn, Fe, Cr, Ti, and W; metallic lithium; lithium alloys, such as lithium-aluminum alloys; and lithium-containing transition metal oxides, such as lithium niobium oxide and lithium titanium oxide. An example of the lithium titanium oxide is one represented by the following general composition formula (1). Li 1 / 3-a M 1 a Ti 5 / 3-b M 2 b ]O 4 (1)

[0040] In general composition formula (1), M 1 is at least one element selected from the group consisting of Na, Mg, K, Ca, Sr and Ba, M 2 is at least one element selected from the group consisting of Al, V, Cr, Fe, Co, Ni, Zn, Ym, Zr, Nb, Mo, Ta, and W, where 0≦a<1 / 3 and 0≦b≦2 / 3.

[0041] That is, in the lithium titanium oxide represented by the general composition formula (1), some of the Li sites are occupied by the element M 1 However, in the general composition formula (1), the element M 1 In the lithium titanium oxide represented by the general composition formula (1), Li is an element M 1 Since it is not necessary to substitute with element M 1 The ratio a can be 0.

[0042] In addition, in the lithium titanium oxide represented by the general composition formula (1), the element M 2 is a component that enhances the electronic conductivity of lithium titanium oxide, and element M 2 When b, which represents the ratio of the above, satisfies 0≦b≦2 / 3, the effect of improving the electronic conductivity can be satisfactorily ensured.

[0043] The negative electrode active material may be one or more of the above-mentioned materials. For example, when lithium titanium oxide is used, a negative electrode active material other than lithium titanium oxide may be used together with the lithium titanium oxide. However, the proportion of the negative electrode active material other than lithium titanium oxide in the total amount of the negative electrode active material is preferably 30 mass% or less.

[0044] The solid electrolyte of the negative electrode 202 is not particularly limited as long as it has lithium ion conductivity, and for example, a sulfide-based solid electrolyte, a hydride-based solid electrolyte, an oxide-based solid electrolyte, or the like can be used.

[0045] As a sulfide-based solid electrolyte, for example, Li 2 SP 2 S 5 , Li 2 S-SiS 2 , Li 2 SP 2 S 5 -GeS 2 , Li 2 S.B. 2 S 3 In addition to lithium-ion-conducting glass, Li 10 GeP 2 S 12 (LGPS series) and Li 6 P.S. 5 Cl (argyrodite-based) can also be used. Among these, argyrodite-based materials, which have particularly high lithium ion conductivity and high chemical stability, are preferably used.

[0046] Examples of hydride-based solid electrolytes include LiBH 4 , L.B.H. 4 and the following alkali metal compounds (e.g., LiBH 4 and the alkali metal compound in a molar ratio of 1:1 to 20:1. The alkali metal compound in the solid solution may be at least one selected from the group consisting of lithium halides (LiI, LiBr, LiF, LiCl, etc.), rubidium halides (RbI, RbBr, RbiF, RbCl, etc.), cesium halides (CsI, CsBr, CsF, CsCl, etc.), lithium amide, rubidium amide, and cesium amide.

[0047] As an oxide-based solid electrolyte, for example, Li 7 La 3 Zr 2 O 12 , LiTi(PO 4 ) 3 , LiGe(PO 4 ) 3 , LiLaTiO 3 etc.

[0048] The solid electrolyte may be one or more of those exemplified above. Among the solid electrolytes exemplified above, it is more preferable to use a sulfide-based solid electrolyte, since it has high lithium ion conductivity and also has the function of increasing the moldability of the negative electrode mixture.

[0049] As the conductive assistant of the negative electrode 202, for example, a carbon material such as carbon black can be used.

[0050] The negative electrode mixture may or may not contain a binder. When the negative electrode mixture contains a binder, the binder may be a fluororesin such as polyvinylidene fluoride (PVDF).

[0051] When a current collector is used for the negative electrode 202, the current collector can be made of copper, nickel, stainless steel, or aluminum foil, punched metal, net, expanded metal, foamed metal, carbon sheet, or the like.

[0052] The negative electrode 202 can be manufactured by mixing the active material, lithium titanium oxide particles, a solid electrolyte, a conductive assistant, and the like, for example, without using a solvent, to prepare a negative electrode mixture, and molding the mixture into a pellet or the like. The negative electrode 202 may also be manufactured by bonding the molded negative electrode mixture obtained as described above to a current collector.

[0053] Alternatively, the above-mentioned negative electrode mixture and a solvent may be mixed to prepare a negative electrode mixture-containing composition, which may then be applied onto a substrate such as a current collector or the solid electrolyte layer 203 that faces the negative electrode 202, dried, and then pressed to form a molded body of the negative electrode mixture.

[0054] It is preferable to select a solvent that does not easily deteriorate the solid electrolyte for use in the negative electrode mixture-containing composition. In particular, since sulfide-based solid electrolytes and hydride-based solid electrolytes undergo chemical reactions with trace amounts of water, it is preferable to use non-polar aprotic solvents such as hydrocarbon solvents such as hexane, heptane, octane, nonane, decane, decalin, toluene, and xylene. In particular, it is more preferable to use an ultra-dehydrated solvent with a water content of 0.001 mass% (10 ppm) or less. In addition, fluorine-based solvents such as "Vertrel (registered trademark)" manufactured by Mitsui DuPont Fluorochemicals, "Zeorolla (registered trademark)" manufactured by Nippon Zeon Co., Ltd., and "Novec (registered trademark)" manufactured by Sumitomo 3M Co., Ltd., as well as non-aqueous organic solvents such as dichloromethane and diethyl ether can also be used.

[0055] The composition of the negative electrode mixture is, for example, preferably 50 to 80% by mass of the negative electrode active material, 20 to 50% by mass of the solid electrolyte, and 0.1 to 10% by mass of the conductive assistant. When the negative electrode mixture contains a binder, the binder content is preferably 0.1 to 10% by mass. Furthermore, the thickness of the negative electrode mixture compact (including both the case where the negative electrode does not have a current collector and the case where the negative electrode has a current collector) is preferably 50 to 1000 μm.

[0056] A negative electrode tab 207 is attached to the negative electrode 202. The negative electrode tab 207 is made of a metal material such as copper. The negative electrode tab 207 is joined to a negative electrode power supply plate 40, which will be described later, by welding.

[0057] <Solid electrolyte layer 203> The solid electrolyte in the solid electrolyte layer 203 may be one or more of the same solid electrolytes as those exemplified above for the negative electrode 202. However, in order to improve the battery characteristics, it is preferable to contain a sulfide-based solid electrolyte, and it is more preferable to contain a sulfide-based solid electrolyte in all of the positive electrode 201, the negative electrode 202, and the solid electrolyte layer 203. The solid electrolyte layer 203 may have a porous body such as a resin nonwoven fabric as a support.

[0058] The solid electrolyte layer 203 is a cylindrically shaped molded body (layer) formed by compressing (pressing) a solid electrolyte by pressure molding or the like. The solid electrolyte layer 203 is not limited to being a cylindrical layer, and may be a prismatic layer. The solid electrolyte layer 203 may be formed by applying a composition for forming the solid electrolyte layer 203, which is prepared by dispersing a solid electrolyte in a solvent, onto a substrate, a positive electrode, or a negative electrode, drying the composition, and performing pressure molding such as pressing as necessary.

[0059] As with the solvent used in the negative electrode mixture-containing composition, it is desirable to select a solvent that does not easily deteriorate the solid electrolyte for use in the composition for forming the solid electrolyte layer 203. It is preferable to use the various solvents exemplified above as the solvent for the negative electrode mixture-containing composition, and it is particularly preferable to use an ultra-dehydrated solvent with a water content of 0.001 mass % (10 ppm) or less. The thickness of the solid electrolyte layer 203 is preferably 10 to 200 μm.

[0060] <Manufacture of battery molded body 20> A manufacturing method of the battery molded body 20 which is each cell will be described. The above-mentioned solid electrolyte is placed in a mold or the like, and pressed using a press or the like to form a provisionally molded layer of the solid electrolyte layer 203. A negative electrode mixture constituting the negative electrode 202 is placed on the provisionally molded layer of the solid electrolyte layer 203. After the negative electrode mixture is placed, the negative electrode mixture and the provisionally molded layer of the solid electrolyte layer 203 are pressed using a press or the like to form a provisionally molded layer of the negative electrode 202 on the upper part of the solid electrolyte layer 203.

[0061] Thereafter, the provisionally formed layer of the solid electrolyte layer 203 and the provisionally formed layer of the negative electrode 202 are turned upside down. In this case, the provisionally formed layer of the solid electrolyte layer 203 and the provisionally formed layer of the negative electrode 202 may be taken out of the mold once, turned upside down, and then placed again in the mold. Then, a positive electrode mixture constituting the positive electrode 201 is placed on the provisionally formed layer of the solid electrolyte layer 203, i.e., on the surface of the provisionally formed layer of the solid electrolyte layer 203 that does not face the provisionally formed layer of the negative electrode 202. After the positive electrode mixture is placed, the positive electrode mixture, the provisionally formed layer of the solid electrolyte layer 203, and the provisionally formed layer of the negative electrode 202 are pressed using a press or the like. As a result, the positive electrode mixture, the provisionally molded layer of the solid electrolyte layer 203, and the provisionally molded layer of the negative electrode 202 are compressed, and a laminate 211 is formed having the solid electrolyte layer 203, a layered negative electrode 202 on one side of the solid electrolyte layer 203, and a layered positive electrode 201 on the other side of the solid electrolyte layer 203.

[0062] Since the positive electrode 201, the negative electrode 202, and the solid electrolyte layer 203 have a cylindrical shape, the laminate 211 also has a cylindrical shape. When the positive electrode 201, the negative electrode 202, and the solid electrolyte layer 203 are formed to have a prismatic shape, the laminate 211 also has a prismatic shape.

[0063] A polar sheet 201a is attached to one surface of the laminate 211, that is, the surface on which the positive electrode 201 is formed. The polar sheet 201a is formed in a disk shape according to the shape of the cylindrical laminate 211. If the laminate 211 is prismatic, the polar sheet 201a is also formed in a polygonal plate shape according to the shape of the laminate 211. A positive electrode tab 206 is joined to the polar sheet 201a by, for example, welding. A polar sheet 202a is attached to the other surface of the laminate 211, that is, the surface on which the negative electrode 202 is formed. A negative electrode tab 207 is joined to the polar sheet 202a by, for example, welding. The polar sheet 202a is also formed in a shape according to the shape of the laminate 211.

[0064] The side of the laminate 211 is covered with a non-conductive heat shrink tube 212 made of a polymer such as polyethylene or various elastomers. The heat shrink tube 212 may be attached after the positive electrode tab 206 and the negative electrode tab 207 are bonded to the polar sheets 201a and 202a. Alternatively, the heat shrink tube 212 may be attached before the positive electrode tab 206 and the negative electrode tab 207 are bonded to the polar sheets 201a and 202a. By attaching the heat shrink tube 212, separation of the laminate 211 and the polar sheets 201a and 202a is suppressed. In addition, since the heat shrink tube 212 is made of a non-conductive material, when the battery molded body 20 is housed in the battery can 10, it is possible to insulate the battery molded body 20 from the metal battery can 10.

[0065] <Positive power supply plate 30> The positive electrode power supply plate 30 is a metal material such as nickel or aluminum that electrically connects the positive electrode 201 of the battery molded body 20 to an electrode terminal of the can lid portion 50 described later. The positive electrode power supply plate 30 has a tab connection portion 301 and a contact connection portion 302.

[0066] The tab connection portion 301 is joined by welding to a positive electrode tab 206 attached to each positive electrode 201 of the multiple battery molded bodies 20. The contact connection portion 302 is connected to the upper part of the tab connection portion 301 and extends on a plane intersecting with the extension direction A1. The contact connection portion 302 is adhesively fixed to an insulating plate 210 arranged on the uppermost battery molded body 20 among the battery molded bodies 20 arranged along the extension direction A1.

[0067] <Negative power supply plate 40> The negative power supply plate 40 is a member that electrically connects the negative electrode 202 of the battery molded body 20 and the battery can 10. Specifically, the negative power supply plate 40 is a plate-shaped member having a long side along the extension direction A1. The negative power supply plate 40 is made of a metal material such as nickel or copper. The negative power supply plate 40 is joined by welding to the negative electrode tabs 207 attached to the negative electrodes 202 of each of the multiple battery molded bodies 20. An upper end of the negative power supply plate 40 protrudes upward beyond the upper end of the cell assembly 21. The negative power supply plate 40 is joined at this upwardly protruding upper end to the inner peripheral surface of the side surface 102 of the battery can 10 by welding or the like.

[0068] <Cell Assembly 21> 4 is an exploded perspective view of the cell assembly 21. The cell assembly 21 is manufactured by stacking the battery molded bodies 20, which are multiple cells manufactured as described above, and the insulating plate 210 along the extension direction A1. That is, in the cell assembly 21, the multiple battery molded bodies 20 are arranged along the extension direction A1. This allows the multiple battery molded bodies 20 to be accommodated in the cylindrical battery can 10, and prevents the all-solid-state battery 1 from becoming large.

[0069] Although Figures 2 and 4 show four battery molded bodies 20a, 20b, 20c, and 20d stacked, the number of stacked battery molded bodies 20 is not limited to four and may be more or less than four.

[0070] In the cell assembly 21, an insulating plate 210 is disposed between each battery molded body 20. The insulating plate 210 is formed into a disk shape corresponding to the cylindrical shape of each battery molded body 20. The insulating plate 210 is not limited to being formed into a disk shape, but is formed into a shape corresponding to the shape of the battery molded body 20. For example, when the battery molded body 20 is prismatic, the insulating plate 210 is formed into a polygonal plate shape.

[0071] As described above, the insulating plate 210 is disposed between each battery molded body 20. Specifically, the insulating plate 210a is disposed between the upper surface of the battery molded body 20a and the lower surface of the battery molded body 20b. The insulating plate 210b is disposed between the upper surface of the battery molded body 20b and the lower surface of the battery molded body 20c. The insulating plate 210c is disposed between the upper surface of the battery molded body 20c and the lower surface of the battery molded body 20d. This allows the battery molded bodies 20a, 20b, 20c, and 20d to be arranged in an insulated state.

[0072] An insulating plate 210d is disposed on the upper surface of the uppermost battery molded body 20d. The insulating plate 210d has a cutout portion 210e that is cut out linearly at a position facing the tab connection portion 301 of the positive power supply plate 30 and the negative power supply plate 40. This prevents the positive power supply plate 30 and the negative power supply plate 40 from interfering with the insulating plate 210d. The insulating plate 210d does not necessarily have to have the cutout portion 210e.

[0073] <Containment in Battery Can 10> The placement of the battery molded body 20, the positive power supply plate 30, and the negative power supply plate 40 within the battery can 10 will now be described.

[0074] FIG. 5 is an external perspective view showing a process in which the cell assembly 21 to which the positive and negative power supply plates 30 and 40 are attached is housed in the battery can 10. As shown in FIG.

[0075] The side of the cell assembly 21 to which the positive power supply plate 30 and the negative power supply plate 40 are attached is covered with a non-conductive heat shrink tube 213 made of a polymer such as polyethylene or various elastomers. That is, the battery molded bodies 20, the positive power supply plate 30, and the negative power supply plate 40 are covered with the heat shrink tube 213. However, the area above the insulating plate 210d arranged at the top of the cell assembly 21 is not covered with the heat shrink tube 213. That is, the vicinity of the upper end of the tab connection portion 301 (FIG. 2) of the positive power supply plate 30, the contact connection portion 302, and the vicinity of the upper end of the negative power supply plate 40 are not covered with the heat shrink tube 213.

[0076] By covering the side surface of the cell assembly 21 with the heat shrink tube 213, the multiple battery molded bodies 20 constituting the cell assembly 21 can be fixed, so that the battery molded bodies 20 are prevented from being separated or falling off. Also, the positive power supply plate 30 joined to the positive tab 206 is prevented from falling off, or the negative power supply plate 40 joined to the negative tab 207 is prevented from falling off. Also, when the cell assembly 21 is housed in the battery can 10, the heat shrink tube 213 prevents the positive power supply plate 30 from coming into direct contact with the battery can 10. As a result, the occurrence of a short circuit due to contact between the positive power supply plate 30 and the battery can 10 is prevented.

[0077] In addition, a positive electrode insulating seal 215 is attached, for example, by adhesion, near the upper end of the tab connection portion 301 of the positive electrode power supply plate 30, i.e., near the position where it is connected to the contact connection portion 302. This prevents the positive electrode power supply plate 30, in which the cell assembly 21 is housed in the battery can 10, from coming into contact with the battery can 10, thereby preventing a short circuit from occurring. Note that, if the vicinity of the upper end of the tab connection portion 301 of the positive electrode power supply plate 30 can be covered with the above-mentioned heat shrink tube 213, the positive electrode insulating seal 215 does not need to be attached.

[0078] The cell assembly 21, to which the heat shrink tube 213 and the positive electrode insulating seal 215 are attached, is moved downward along the extension direction A1 from above the battery can 10 and inserted into the battery can 10. The side of the cell assembly 21 inserted into the battery can 10 comes into contact with the protrusion 103 formed on the inner circumferential surface of the side surface 102 of the battery can 10. This suppresses the cell assembly 21 from vibrating inside the battery can 10.

[0079] In this state, the vicinity of the upper end portion of the negative power supply plate 40, i.e., the portion of the negative power supply plate 40 that is not covered by the heat shrink tube 213, is joined to the battery can 10 by welding or the like. This electrically connects the negative electrode 202 and the battery can 10 via the negative power supply plate 40. Thereafter, the gap between the cell assembly 21 and the inner circumferential surface of the side surface 102 of the battery can 10 is filled with an adhesive, a gelled elastic resin, or the like.

[0080] The negative power supply plate 40 is not limited to being joined to the battery can 10. The positive power supply plate 30 may be joined to the battery can 10. In this case, the negative power supply plate 40 may be configured to come into contact with a portion of the can lid portion 50 described later.

[0081] <Can lid part 50> The can lid part 50 is attached to an upper end, which is one end of the battery can 10, in the stretching direction A1, thereby sealing the opening of the battery can 10. The can lid part 50 is attached, for example, by rolling, bonding, crimping, or the like, and seals the opening of the battery can 10. The can lid part 50 includes an electrode terminal that contacts an electrical contact of a device in which the all-solid-state battery 1 is mounted, and an electrode contact that contacts the above-mentioned positive power supply plate 30. When the positive power supply plate 30 is joined to the battery can 10, the negative power supply plate 40 contacts the electrode terminal.

[0082] [Example] An embodiment of the all-solid-state battery 1 will be described below. <Battery can 10> As shown in FIG. 2, near the upper end of the side surface 102 of the battery can 10, there are formed a short diameter portion 105 having an inner diameter smaller than that of the bottom surface 101 of the battery can 10, and a drawn portion 106 that is connected to the lower part of the short diameter portion 105 and has an inner diameter that gradually decreases as it goes upward along the extension direction A1. A step portion 107 is formed along the inner circumference on the inner peripheral surface of the lower end side of the drawn portion 106. The inner diameter of the step portion 107 is smaller than the inner diameter at the lower end of the drawn portion 106. Therefore, the step portion 107 has a surface that intersects with the extension direction A1. A positive electrode contact pressing plate 65 of the can lid portion 50 described later is arranged on the surface of this step portion 107.

[0083] <Battery molded body 20 and cell assembly 21> As shown in Fig. 4, the four battery molded bodies 20a, 20b, 20c, and 20d are arranged in the above order from bottom to top. Each battery molded body 20 is arranged so that the negative electrode 202 faces downward and the positive electrode 201 faces upward. Note that the arrangement is not limited to one in which the negative electrodes 202 of the battery molded bodies 20a, 20b, 20c, and 20d face downward, and the positive electrodes 201 may face downward.

[0084] Fig. 6(a) is an external perspective view of one battery molded body 20 (20a, 20b, 20c), and Fig. 6(b) is an external perspective view of one battery molded body 20 (20d).

[0085] The positive electrode tab 206 connected to the positive electrode 201 of the battery molded body 20 has a main portion 206a and a connection portion 206b. The main portion 206a is formed in a plate shape extending in a direction intersecting with the extension direction A1. The main portion 206a is joined to a polar sheet 201a attached to the positive electrode 201, thereby being electrically connected to the positive electrode 201.

[0086] As shown in FIG. 6(a), the connection portion 206b provided on the battery molded bodies 20a, 20b, and 20c is connected to the end of the main portion 206a and extends along the extension direction A1, which is a direction intersecting (specifically, perpendicular to) the main portion 206a. As shown in FIG. 6(b), in the positive electrode tab 206 provided on the uppermost battery molded body 20d, the connection portion 206b is formed via the rising portion 206c that extends upward from the end of the main portion 206a along the extension direction A1. The connection portion 206b extends in a direction intersecting (specifically, perpendicular to) the extension direction A1. In other words, the positive electrode tab 206 shown in FIG. 6(b) has a shape in which the connection portion 206b of the positive electrode tab 206 shown in FIG. 6(a) is bent toward the main portion 206a.

[0087] In the battery molded body 20d, the main portion 206a and the connection portion 206b are connected via the rising portion 206c, so that a space is formed between the main portion 206a and the connection portion 206b along the extension direction A1. The insulating plate 201d is inserted into this space, and the insulating plate 210d is disposed on the battery molded body 20d. At this time, the insulating plate 210d is disposed so that the notch portion 210e faces the rising portion 206c. As a result, the connection portion 206b of the positive electrode tab 206 of the battery molded body 20d is disposed on the insulating plate 201d.

[0088] The connection portion 206b is joined by welding to the positive power supply plate 30. In this way, the positive electrode 201 of the battery molded body 20 and the positive power supply plate 30 are electrically connected to each other.

[0089] The negative electrode tab 207 connected to the negative electrode 202 of the battery molded body 20 has a main portion 207a and a connection portion 207b. The main portion 207a is formed in a plate shape extending in a direction intersecting the extension direction A1. The main portion 207a is joined to a polar sheet 202a attached to the negative electrode 202, thereby being electrically connected to the negative electrode 202.

[0090] The connection portion 207b is connected to an end of the main portion 207a and extends along the extension direction A1, which is a direction intersecting (specifically, perpendicular to) the main portion 207a. The connection portion 207b extends from the surface of the negative electrode 202 along the extension direction A1 toward the positive electrode 201. As shown in FIG. 6(a) and FIG. 6(b), the negative electrode tab 207 is attached at a position where the connection portion 207b of the negative electrode tab 207 and the connection portion 206b of the positive electrode tab 206 are symmetrical with respect to the center line C (i.e., the connection portion 206b and the connection portion 207b face each other). The center line C is a virtual line that passes through the center of the battery molded body 20 and extends along the extension direction A1. The connection portion 207b is joined to the negative electrode power supply plate 40 by welding. As a result, the negative electrode 202 of the battery molded body 20 and the negative electrode power supply plate 40 are electrically connected.

[0091] 7 is an external perspective view of a cell assembly 21 formed by stacking the battery molded bodies 20a, 20b, 20c, and 20d having the above-mentioned configuration. In the cell assembly 21, the battery molded bodies 20 are oriented when stacked such that the connection parts 207b of the negative electrode tabs 207 attached to each battery molded body 20 are aligned linearly along the extension direction A1. Therefore, the connection parts 206b of the positive electrode tabs 206 of the battery molded bodies 20a, 20b, 20c, and 20d are also aligned linearly along the extension direction A1 at positions symmetrical with respect to the center line C and facing the connection parts 207b of the negative electrode tabs 207.

[0092] <Positive power supply plate 30> FIG. 8 is an external perspective view of the cell assembly 21 with the positive and negative power supply plates 30 and 40 attached thereto.

[0093] As described above, the positive power supply plate 30 has the tab connection portion 301 and the contact connection portion 302. The tab connection portion 301 is formed in a plate shape having a long side along the extension direction A1. The tab connection portion 301 is joined to the positive electrode tab 206 attached to the battery molded bodies 20a, 20b, and 20c. The lower surface of the contact connection portion 302 is joined to the positive electrode tab 206 of the battery molded body 20d arranged at the top of the cell assembly 21.

[0094] <Can lid part 50> The can lid 50 will be described in detail with reference to Figs. 9(a) and 9(b) in addition to the side view of Fig. 2. Fig. 9(a) is an exploded perspective view of the can lid 50. Fig. 9(b) is an enlarged partial cross-sectional view of region R shown in Fig. 2. The can lid 50 has a cap 61, a positive terminal 62 which is an electrode terminal, a positive contact 63 which is an electrode contact, a conductive elastic body 64, a positive contact pressing plate 65, and a gasket 66.

[0095] <Cap 61> The cap 61 is made of a conductive material such as metal. A positive electrode terminal 62, a positive electrode contact 63, a conductive elastic body 64, and a gasket 66, which will be described later, are attached to the cap 61. The cap 61 has an upper surface 610 that intersects with, or more specifically, is perpendicular to, the extension direction A1, and an attachment portion 611 formed along the outer periphery of the upper surface 610. The upper surface 610 is formed in a disk shape that corresponds to the shape of the battery can 10, which is a cylindrical can.

[0096] The cap 61 is not limited to being formed in a disk shape, and may be formed in a shape that corresponds to the shape of the battery molded body 20, i.e., the shape of the battery can 10. For example, when the battery can 10 is a rectangular cylindrical can, the cap 61 may be formed in a rectangular plate shape.

[0097] An opening 612 is formed near the center of the upper surface 610. A positive electrode terminal 62 and a gasket 66, which will be described later, are attached to this opening 612. The attachment portion 611 is a portion where attachment processing is performed between the battery can 10 and the upper end portion of the side surface 102 when the cap 61 is attached to the battery can 10.

[0098] <Positive terminal 62> The positive electrode terminal 62 is made of a conductive material such as metal. As described above, the positive electrode terminal 62 is provided in the opening 612 formed in the upper surface 610 of the cap 61. Specifically, the positive electrode terminal 62 is provided in the opening 612 of the cap 61 via a gasket 66 made of a non-conductive material such as resin. Specifically, the positive electrode terminal 62, the gasket 66, and the cap 61 are integrally molded by, for example, insert molding, so that the gap between the positive electrode terminal 62 and the opening 612 is sealed by the gasket 66.

[0099] The positive electrode terminal 62 is formed in a hollow tubular shape having an upper surface 620 and a side surface 621 that is connected to the upper surface 620 and extends downward along the extension direction A1. Although the positive electrode terminal 62 is shown in the figure as being cylindrical, it may be in a rectangular tubular shape. The upper surface 620 protrudes upward beyond the upper surface 610 of the cap 61 and the upper surface of the gasket 66. A conductive elastic body 64 is accommodated inside the positive electrode terminal 62.

[0100] <Gasket 66> As described above, the gasket 66 is made of a non-conductive material such as resin. The gasket 66 is formed into a hollow cylindrical shape extending along the stretching direction A1. The positive electrode terminal 62, the positive electrode contact 63, and the conductive elastic body 64 are accommodated inside the gasket 66. As described above, the positive electrode terminal 62, the gasket 66, and the cap 61 are integrally molded, so that the outer peripheral surface of the gasket 66 is in close contact with the opening 612 of the cap 61. In addition, the positive electrode terminal 62 is attached to the upper part of the inner peripheral surface of the gasket 66 without any gaps.

[0101] <Positive contact 63> The positive electrode contact 63 is a conductive material such as metal, and is formed in a hollow tubular shape having a lower surface 630 and a side surface 631 that is connected to the lower surface 630 and extends upward along the extension direction A1. Although the figure shows the positive electrode contact 63 in a cylindrical shape, it may be in a rectangular tubular shape. A conductive elastic body 64 is housed in the positive electrode contact 63. When the can lid portion 50 is attached to the battery can 10, the lower surface 630 comes into contact with the above-mentioned positive electrode power supply plate 30.

[0102] <Conductive elastic body 64> The conductive elastic body 64 is a coil spring made of a conductive material such as metal. The conductive elastic body 64 may be, for example, a cylindrical coil spring or a conical coil spring. The conductive elastic body 64 may also be a leaf spring instead of a coil spring.

[0103] The conductive elastic body 64 is provided inside the cylindrical positive terminal 62 and inside the cylindrical positive contact 63. Specifically, the upper end of the conductive elastic body 64 is attached to the upper surface 620 of the positive terminal 62, and the lower end of the conductive elastic body 64 is attached to the lower surface 630 of the positive contact 63. As a result, a reaction force acts on the positive terminal 62 and the positive contact 63 by the conductive elastic body 64. In other words, the positive contact 63 is biased downward by the conductive elastic body 64. In addition, since the positive terminal 62, the positive contact 63, and the conductive elastic body 64 are made of metal materials, it can be said that the positive terminal 62, the positive contact 63, and the conductive elastic body 64 are electrically connected.

[0104] <Positive contact holder 65> The positive contact pressing plate 65 is a disk-shaped member made of a non-conductive material such as resin. The positive contact pressing plate 65 is not limited to being formed in a disk shape, and may be formed in a shape corresponding to the shape of the battery molded body 20, i.e., the shape of the battery can 10. For example, when the battery can 10 is a rectangular cylindrical can, the positive contact pressing plate 65 may be formed in a rectangular plate shape.

[0105] The positive electrode contact pressing plate 65 has a support opening 651 in the vicinity of the center line C. The positive electrode contact 63 is inserted from above into the support opening 651. The positive electrode contact 63 inserted into the support opening 651 has a lower surface 630 protruding downward beyond a lower surface 652 of the positive electrode contact pressing plate 65.

[0106] When the positive electrode contact pressing plate 65 is accommodated in the battery can 10, the peripheral edge of the lower surface 652 is placed on the upper surface of a step portion 107 formed at the lower end of the drawn portion 106 of the battery can 10. In this way, the positive electrode contact pressing plate 65 is supported by the battery can 10.

[0107] <Attachment of can lid part 50> The attachment of the can lid 50 having the above-mentioned configuration to the battery can 10 will be described. As described above, after the cell assembly 21, the positive power supply plate 30, and the negative power supply plate 40 are accommodated in the battery can 10, the can lid 50 is attached from the top of the battery can 10. First, the positive contact pressing plate 65 is inserted into the battery can 10. As described above, the periphery of the lower surface 652 of the positive contact pressing plate 65 is placed on the upper surface of the step portion 107 formed at the lower end of the drawn portion 106 of the battery can 10. Then, the cap 61 to which the positive terminal 62, the positive contact 63, the conductive elastic body 64, and the gasket 66 are attached is placed on the upper end surface of the side surface 102 of the battery can 10. At this time, the lower surface 630 of the positive contact 63 is inserted into the support opening 651 of the positive contact pressing plate 65. Also, the lower surface of the gasket 66 is placed on the upper surface 653 of the positive contact pressing plate 65. As a result, the positive electrode terminal 62 integrally molded with the gasket 66 and the positive electrode contact 63 connected via the conductive elastic body 64 are supported by the positive electrode contact pressing plate 65. In other words, the positive electrode contact pressing plate 65 functions as a support portion that supports the positive electrode contact 63.

[0108] In this state, the mounting portion 611 of the cap 61 and the short diameter portion 105 at the upper end of the side surface 102 of the battery can 10 are crimped, for example, by seam crimping, so that the cap 61 is attached to the battery can 10. As a result, the opening of the side surface 102 of the battery can 10 is sealed by the cap 61 attached to the battery can 10.

[0109] As described above, the positive electrode contact 63 supported by the cap 61 via the positive electrode contact pressing plate 65 is biased downward by the conductive elastic body 64. Therefore, when the can lid part 50 is attached to the battery can 10, the positive electrode contact 63 comes into contact with the contact connection part 302 on the upper part of the positive electrode power supply plate 30. As a result, since the positive electrode terminal 62 and the positive electrode contact 63 are electrically connected as described above, the positive electrode terminal 62 is electrically connected to the positive electrode 201 by the positive electrode power supply plate 30.

[0110] In addition, since the positive electrode contact 63 is supported by the positive electrode contact pressing plate 65 made of a non-conductive material, even if the positive electrode contact pressing plate 65 is in contact with the battery can 10, it is not electrically connected to the battery can 10 that is electrically connected to the negative electrode 202. In addition, since the positive electrode terminal 62 is supported by the cap 61 made of a conductive material via the gasket 66 made of a non-conductive material, it is not electrically connected to the battery can 10 even if the cap 61 is in contact with the battery can 10. As a result, the positive electrode terminal 62 and the positive electrode contact 63 that are electrically connected to the positive electrode 201 are insulated from the battery can 10 that is electrically connected to the negative electrode 202.

[0111] The above-mentioned positive terminal 62, positive contact 63, and conductive elastic body 64 of the can lid portion 50 are not limited to being electrically connected to the positive power supply plate 30. For example, when the positive power supply plate 30 is joined to the battery can 10, the positive terminal 62 which is an electrode terminal of the can lid portion 50, the positive contact 63 which is an electrode contact, and the conductive elastic body 64 may be electrically connected to the negative power supply plate 40.

[0112] According to the above-described embodiment and example, at least one of the following advantageous effects can be obtained.

[0113] (1) The all-solid-state battery 1 includes a battery can 10 made of a conductive material that houses a battery molded body 20, a positive electrode power supply plate 30, and a negative electrode power supply plate 40, and a can lid portion 50 provided at one end of the battery can 10 in an extension direction A1 in which the battery can 10 extends. The can lid portion 50 includes a positive electrode terminal 62 that is an electrode terminal made of a conductive material and electrically connected to the positive electrode power supply plate 30 or the negative electrode power supply plate 40, a gasket 66 made of a non-conductive material, and a cap 61. The positive electrode terminal 62, the gasket 66, and the cap 61 are integrally molded, so that the positive electrode terminal 62 is attached to the cap 61 via the gasket 66, and the cap 61 seals one end (the end on the upper side) of the battery can 10. This allows the inside of the battery can 10 to be sealed in a state in which the positive electrode terminal 62, which is electrically connected to the positive electrode 201 of the battery molded body 20, and the battery can 10, which is electrically connected to the negative electrode 202, are insulated by the gasket 66. As a result, the battery molded body 20 housed in the battery can 10 is prevented from reacting with moisture in the air, and deterioration of battery performance can be suppressed. In addition, since the cap 61 of the can lid portion 50 is made of a metal material or the like, the strength of the can lid portion 50 can be ensured.

[0114] (2) The cap 61 is provided with a positive contact 63, which is an electrode contact that comes into contact with the positive power supply plate 30 or the negative power supply plate 40. The conductive elastic body 64 is provided between the positive terminal 62 and the positive contact 63, and applies a force along the extension direction A1 to the positive contact 63. As a result, a reaction force acts between the positive terminal 62 and the positive contact 63, and the positive contact 63 is urged downward along the extension direction A1. As a result, contact between the positive contact 63 and the contact connection part 302 of the positive power supply plate 30 disposed below the can lid part 50 is maintained.

[0115] In addition, since the conductive elastic body 64 is attached to the positive terminal 62 and the positive contact 63, it becomes possible to electrically connect the positive terminal 62 and the positive power supply plate 30. In other words, it becomes possible to electrically connect the positive terminal 62 and the positive electrode 201 of the battery molded body 20.

[0116] (3) The can lid portion 50 is provided inside the battery can 10 and has a positive contact pressing plate 65 which is a support member made of a non-conductive material that supports the positive contact 63. The positive contact pressing plate 65 has a support opening 651 into which the positive contact 63 is inserted, on a surface intersecting the extension direction A1. This makes it possible to attach the positive contact 63 made of a conductive material to the inside of the battery can 10 while maintaining contact between the positive contact 63 and the positive power supply plate 30.

[0117] (4) The positive electrode contact pressing plate 65 made of a non-conductive material such as resin is placed on a stepped portion 107 provided along the inner peripheral surface of the battery can 10. This makes it possible to attach the positive electrode contact pressing plate 65 to the battery can 10 made of a conductive material with a simple structure.

[0118] <Second embodiment> The all-solid-state battery of the second embodiment will be described below. In the following description, the same components as those of the first embodiment are given the same reference numerals, and differences will be mainly described. Points that are not particularly described are the same as those of the first embodiment. The all-solid-state battery of the second embodiment differs from the all-solid-state battery 1 of the first embodiment in that a cell assembly in which a plurality of battery molded bodies are stacked, and a positive electrode power supply plate and a negative electrode power supply plate attached to the cell assembly are covered with an elastic member.

[0119] Fig. 10 is an external perspective view of the all-solid-state battery 1A of the second embodiment, and Fig. 11 is a cross-sectional view taken along line DD shown in Fig. 10. As shown in Fig. 11, the all-solid-state battery 1A has an elastic member 70 in addition to the configuration of the all-solid-state battery 1 of the first embodiment described above.

[0120] In the following description, the assembly in which the positive power supply plate 30 (see FIG. 13) and the negative power supply plate 41 (see FIG. 13) are attached to the cell assembly 21 and covered with the heat shrink tube 213 is called a battery assembly 29 (see FIG. 13). Note that the cell assembly 21 does not have to be covered with the heat shrink tube 213. <Battery can 10>

[0121] 1 and the like that extends upward from the lower end along the extension direction A1 is not formed on the outer peripheral surface of the side surface 102 of the battery can 10 of the present embodiment. Therefore, the inner peripheral surface of the side surface 102 of the battery can 10 does not have the protrusion 103 that protrudes toward the inside of the battery can 10 and that is shown in FIG.

[0122] <Elastic member 70> 11, the elastic member or shock absorbing material 70 is housed in a space formed between the battery assembly 29 and the inner peripheral surface of the battery can 10. The elastic member 70 is a low-resilience soft material such as a gel material mainly made of silicone, butyl rubber, silicone rubber, or foam cushion. The elastic member 70 is a shock absorbing material that absorbs shock acting on the all-solid-state battery 1A and suppresses application of the shock to the battery molded body 20 constituting the battery assembly 29.

[0123] FIG. 12(a) is an external perspective view of the elastic member 70 as viewed from above. FIG. 12(b) is an external perspective view of the elastic member 70 as viewed from below. FIG. 13 is an external perspective view showing a process when the battery assembly 29 is accommodated in the elastic member 70. The elastic member 70 has a bottomed or open cylindrical shape with one side (upper side) open in the extension direction A1 and the other side (lower side) closed. The battery assembly 29 is accommodated inside the elastic member 70. The elastic member 70 accommodating the battery assembly 29 is accommodated inside the battery can 10 (see FIG. 14). For this reason, the elastic member 70 is formed into a cylindrical shape according to the battery can 10 and the battery assembly 29, which are formed into cylindrical shapes.

[0124] The elastic member 70 is not limited to having a cylindrical shape, but may have a square tube shape, such as a rectangular cross section, depending on the shapes of the battery can 10 and the battery assembly 29 .

[0125] The elastic member 70 has a bottom surface 701 and a side surface 702. The side surface 702 is connected to the bottom surface 701 and extends along an extension direction A1 that intersects (more specifically, is perpendicular to) the bottom surface 701. The length of the side surface 702 along the extension direction A1 is longer than the length of the battery assembly 29 along the extension direction A1. For this reason, when the battery assembly 29 is housed in the elastic member 70, the upper end portion of the side surface 702 protrudes upward beyond the battery assembly 29.

[0126] The side surface 702 of the elastic member 70 faces the inner peripheral surface of the side surface 102 of the battery can 10 on the outer peripheral surface side. The side surface 702 faces the side surface 290 of the battery assembly 29 on the inner peripheral surface side. In other words, the side surface 702 is a covering surface that covers the side surface 290 of the battery assembly 29, and also a covering surface that covers the side surface of the cell assembly 21 via the heat shrink tube 213. The bottom surface 701 faces the upper surface of the bottom surface 101 of the battery can 10 on the lower side (the other side) of the extension direction A1. In other words, the bottom surface 701 is an opposing surface that faces the bottom surface 101, which is the other end of the battery can 10. The bottom surface 701 of the elastic member 70 faces the bottom surface 291 of the battery assembly 29 housed inside the cylindrical shape on the upper side. The side surface 702 of the elastic member 70 covering the side surface of the cell assembly 21 may directly cover the side surface of the cell assembly 21 that is not covered with the heat shrink tube 213, or may cover the side surface via another member such as the heat shrink tube 213 as described above. Therefore, in the following description, "battery assembly 29" may be read as "cell assembly 21" in some cases.

[0127] The inner diameter of the elastic member 70 is larger than the outer diameter of the battery assembly 29. Therefore, when the battery assembly 29 is housed inside the elastic member 70 from the opening side, the side surface 290 of the battery assembly 29 comes into contact with the elastic member 70, and friction that makes it difficult to house the battery assembly 29 in the elastic member 70 is suppressed. In addition, the outer diameter of the elastic member 70 is smaller than the inner diameter of the battery can 10. Therefore, when the elastic member 70 housing the battery assembly 29 is housed inside the battery can 10 from the opening side of the battery can 10, the battery can 10 and the elastic member 70 come into contact with each other, and friction that makes it difficult to house the elastic member 70 in the battery can 10 is suppressed.

[0128] <Containment in Battery Can 10> 14 is an external perspective view showing a process in which the battery assembly 29 housed in the elastic member 70 is housed in the battery can 10. The battery assembly 29 housed in the elastic member 70 has a negative power supply plate 41 having a shape different from that of the negative power supply plate 40 of the first embodiment. In the extension direction A1, the negative power supply plate 41 is longer than the elastic member 70, and the vicinity of the upper end of the negative power supply plate 41 protrudes upward from the upper end surface 703 of the side surface 702 of the elastic member 70. The negative power supply plate 41 has a shape that can contact the inner circumferential surface of the battery can 10 near the upper end in the extension direction A1, avoiding the elastic member 70 that is longer along the extension direction A1 than the side surface of the battery assembly 29.

[0129] Specifically, a first step 401 and a second step 402 are formed near the upper end of the negative electrode power supply plate 41 by, for example, bending. The first step 401 extends toward the inner circumferential surface of the side surface 102 of the battery can 10, along a direction intersecting the extension direction A1, above an upper end surface 703 of the elastic member 70 in the extension direction A1. The length by which the first step 401 extends toward the inner circumferential surface of the battery can 10 is preferably equal to or greater than the thickness of the side surface 702 of the elastic member 70.

[0130] The second step 402 is connected to the end of the first step 401 on the inner circumferential surface side of the battery can 10, and extends upward along the extension direction A1. As described above, the length by which the first step 401 extends toward the inner circumferential surface of the battery can 10 is equal to or greater than the thickness of the side surface 702 of the elastic member 70, so that the second step 402 is close to or in contact with the inner circumferential surface of the battery can 10. The second step 402 is joined to the battery can 10 by welding or the like, so that the negative electrode power supply plate 41 is electrically connected to the battery can 10.

[0131] The shape of the negative power supply plate 41 near the upper end portion is not limited to the above-described two-stage bent shape. Any shape that can avoid the elastic member 70 and contact the inner circumferential surface of the battery can 10 can be adopted as the shape of the negative power supply plate 41.

[0132] Also, in the second embodiment, the configuration is not limited to one in which the negative power supply plate 41 is joined to the battery can 10. The positive power supply plate 30 may be joined to the battery can 10. In this case, the negative power supply plate 41 may be configured to come into contact with a portion of the configuration of the can lid portion 50 described later.

[0133] <Can lid part 51> FIG. 15 is an exploded perspective view of the can lid 51 of the second embodiment. The gasket 66 of the can lid 51 of the second embodiment is made of a non-conductive material such as a sintered glass material. In this case, the glass powder that is the material of the gasket 66 is formed, for example, by press molding or the like, into a cylindrical shape that can be inserted into the opening 612 of the cap 61 (see FIGS. 16(a) and 16(b)) and to which the positive electrode terminal 62 can be attached. The positive electrode terminal 62, the gasket 66, and the cap 61 are integrally molded by sintering the glass material of the gasket 66 in an electric furnace or the like using a glass hermetic method. The gasket 66 of the can lid 50 of the first embodiment may also be made of the above-mentioned sintered glass material.

[0134] In the second embodiment, a straight portion 654 is formed by cutting out a part of the positive electrode contact pressing plate 65 formed in a disk shape. When the can lid 51 is attached to the battery can 10, this straight portion 654 faces the second step portion 402 of the negative electrode power supply plate 41. Therefore, interference between the positive electrode contact pressing plate 65 and the negative electrode power supply plate 41 is suppressed.

[0135] Other configurations and shapes of the can lid part 51 of the second embodiment are similar to those of the can lid part 50 of the first embodiment.

[0136] <Attachment of can lid portion 51> The attachment of the can lid 51 having the above-mentioned configuration to the battery can 10 will be described. As described above, after the battery assembly 29 housed in the elastic member 70 is housed in the battery can 10, the can lid 51 is attached from the top of the battery can 10. First, the positive electrode contact pressing plate 65 is inserted into the battery can 10.

[0137] Fig. 16(a) is a partial cross-sectional view showing an enlarged view of the vicinity of the positive electrode contact pressing plate 65 when the positive electrode contact pressing plate 65 is inserted into the battery can 10. Fig. 16(b) is a partial cross-sectional view showing an enlarged view of the vicinity of the positive electrode contact pressing plate 65 after the cap 61 is attached to the battery can 10.

[0138] As described above, the side surface 702 of the elastic member 70 protrudes upward beyond the upper end of the battery assembly 29. Therefore, as shown in FIG 16(a), the peripheral edge of the lower surface 652 of the positive electrode contact pressing plate 65 comes into contact with the upper end surface 703 of the side surface 702 of the elastic member 70.

[0139] Thereafter, in the same manner as in the first embodiment, the cap 61 to which the positive terminal 62, the positive contact 63, the conductive elastic body 64, and the gasket 66 are attached is placed on the upper end surface of the side surface 102 of the battery can 10. As shown in FIG. 16(b), the lower surface 630 of the positive contact 63 is inserted into the support opening 651 of the positive contact pressing plate 65. Also, the lower surface of the gasket 66 is placed on the upper surface 653 of the positive contact pressing plate 65. In this state, the mounting portion 611 of the cap 61 and the short diameter portion 105 at the upper end of the side surface 102 of the battery can 10 are crimped together by, for example, seaming crimping, thereby attaching the cap 61 to the battery can 10.

[0140] By attaching the cap 61, a downward force is applied from the lower surface of the gasket 66 to the positive electrode contact pressing plate 65. As described above, the periphery of the lower surface 652 of the positive electrode contact pressing plate 65 is in contact with the upper end surface 703 of the side surface 702 of the elastic member 70, so that a downward force is applied from the positive electrode contact pressing plate 65 to the elastic member 70. In addition, the bottom surface 701 of the elastic member 70 is in contact with the bottom surface 101 of the battery can 10. Therefore, the elastic member 70 pressed by the force applied from above is compressed and deformed, and the thickness of the side surface 702 increases. That is, the outer diameter of the side surface 702 of the elastic member 70 becomes larger, and the inner diameter becomes smaller.

[0141] Since the thickness of the side surface 702 increases, the outer peripheral surface of the side surface 702 approaches or comes into contact with the inner peripheral surface of the battery can 10, and the inner peripheral surface of the side surface 702 approaches or comes into contact with the outer peripheral surface of the battery assembly 29. That is, the gap (space) that occurred between the outer peripheral surface of the side surface 702 and the inner peripheral surface of the battery can 10 before the can lid portion 51 was attached, and the gap (space) that occurred between the inner peripheral surface of the side surface 702 and the outer peripheral surface of the battery assembly 29 are reduced or filled by the elastic member 70. Therefore, even if an impact is applied to the battery can 10, the movement of the battery assembly 29 within the battery can 10 is suppressed.

[0142] 16(b), when the can lid portion 51 is attached to the battery can 10, the lower surface 630 of the positive electrode contact 63 is in surface contact with the contact connection portion 302 at the upper part of the positive electrode power supply plate 30 while being biased downward by the conductive elastic body 64. Therefore, even if an impact is applied to the all-solid-state battery 1A in a direction intersecting the extension direction A1 and the battery assembly 29 moves relative to the battery can 10 in a direction intersecting the extension direction A1, the contact between the positive electrode contact 63 and the positive electrode power supply plate 30 is maintained. That is, it is possible to continue supplying power to an external device connected to the all-solid-state battery 1A.

[0143] Furthermore, even if an impact is applied to the all-solid-state battery 1A in the extension direction A1 and the battery assembly 29 moves in the extension direction A1 relative to the battery can 10, the conductive elastic body 64 bends in the vertical direction, and contact between the positive electrode contact 63 and the positive electrode power supply plate 30 is maintained. That is, it is possible to continue supplying power to an external device connected to the all-solid-state battery 1A.

[0144] <Manufacturing method of all-solid-state battery 1A> A method for manufacturing the all-solid-state battery 1A will be described with reference to the flowchart shown in FIG. 17. In the first process shown in step S1, the battery molded body 20 is manufactured. In this case, as described in the first embodiment, for example, a press machine or the like is used to apply pressure to the solid electrolyte to form the solid electrolyte layer 203. Then, a negative electrode mixture is placed on one side of the solid electrolyte layer 203, and a negative electrode 202 is formed by applying pressure to the solid electrolyte layer 203 using a press machine or the like. A positive electrode mixture is placed on the other side of the solid electrolyte layer 203, and a positive electrode 201 is formed by applying pressure to the solid electrolyte layer 203 using a press machine or the like. In addition, a positive electrode tab 206 is manufactured from a metal material such as aluminum, and a negative electrode tab 207 is manufactured from a metal material such as copper. Then, a polar sheet 201a is attached to the positive electrode 201 of the laminate 211, and the positive electrode tab 206 is joined to the polar sheet 201a by welding or the like. Also, a polar sheet 202a is attached to the negative electrode 202 of the laminate 211, and a negative electrode tab 207 is joined to this polar sheet 202a by welding or the like (see FIGS. 6(a) and 6(b)).

[0145] In the second process shown in step S2, a battery assembly 29 is manufactured. In this case, a plurality of battery molded bodies 20 manufactured by joining a positive electrode tab 206 and a negative electrode tab 207 to a laminate 211 are stacked to manufacture a cell assembly 21 (see FIG. 7). A positive electrode power supply plate 30 and a negative electrode power supply plate 41 are attached to this cell assembly 21 to manufacture the battery assembly 29. Specifically, the positive electrode tab 206 and the positive electrode power supply plate 30 of each battery molded body 20 constituting the cell assembly 21 are joined by welding or the like, and the negative electrode tab 207 and the negative electrode power supply plate 41 of each battery molded body 20 are joined by welding or the like (see FIG. 8).

[0146] Depending on the production line, the step of joining the positive electrode tab 206 and the negative electrode tab 207 to the laminate 211, which is performed in the first step of step S1 described above, may be performed in the second step of step S2. In this case, in the second step of step S2, the positive electrode tab 206 and the negative electrode tab 207 are joined to the laminate 211 to produce the battery molded body 20, and then the battery assembly 29 is produced. The laminate 211 and the battery assembly 29 are produced such that the direction in which the positive electrode 201, the negative electrode 202, and the solid electrolyte layer 203 of the laminate 211 are stacked (stacking direction) and the direction in which the multiple battery molded bodies 20 are stacked in the battery assembly 29 are aligned with the extension direction A1 of the battery can 10.

[0147] In a third step shown in step S3, the battery assembly 29 is housed inside the elastic member 70. In a fourth step shown in step S4, the battery assembly 29 housed in the elastic member 70 is housed in the battery can 10. In a fifth step shown in step S5, the can lid portion 51 is attached to one opening of the battery can 10 in the extension direction A1 by crimping or the like, and the opening of the battery can 10 is sealed. In this way, the all-solid-state battery 1A is manufactured. When manufacturing the all-solid-state battery 1 of the first embodiment described above, the fourth step shown in step S4 described above may be omitted. According to the second embodiment described above, at least one of the following advantageous effects can be obtained.

[0148] (5) The all-solid-state battery 1A includes an elastic member 70 that covers a battery assembly 29 in which a positive power supply plate 30 and a negative power supply plate 41 are attached to a battery molded body 20. The battery assembly 29 covered with the elastic member 70 is housed in a battery can 10. This allows an impact applied to the battery can 10 to be absorbed by the elastic member 70, and the impact transmitted to the battery assembly 29 can be reduced. As a result, the battery molded body 20 constituting the battery assembly 29 is prevented from being damaged, such as cracked, and functional deterioration of the all-solid-state battery 1A is suppressed.

[0149] (6) In the stretching direction A1, the elastic member 70 is longer than the battery assembly 29. The elastic member 70 housed in the battery can 10 is pressed by the can lid portion 51 provided at one end (upper end) of the battery can 10. This causes the elastic member 70 to deform inside the battery can 10, and the space between the outer circumferential surface of the side surface 702 and the inner circumferential surface of the battery can 10 and the space between the inner circumferential surface of the side surface 702 and the outer circumferential surface of the battery assembly 29 become smaller or filled up. As a result, the battery assembly 29 is prevented from moving inside the battery can 10 due to an impact applied to the battery can 10, and the occurrence of defects such as cracks in the battery molded body 20 is suppressed.

[0150] (7) The elastic member 70 has a cylindrical shape having a side surface 702 which is a covering surface that covers the side surface 290 of the battery assembly 29, and a bottom surface 701 which is an opposing surface that faces the bottom surface 101 at the other end (lower) of the battery can 10. The elastic member 70 houses the battery assembly 29 inside this cylindrical shape. This makes it possible to improve the impact resistance of the battery assembly 29 against impacts applied from the side surface 102 and the bottom surface 101 of the battery can 10.

[0151] The shape of the elastic member 70 is not limited to the cylindrical shape shown in Fig. 12. Modified examples of the elastic member 70 will be described below.

[0152] [First Modification] 18(a) and 18(b) are diagrams for explaining an elastic member 70A of a first modified example. FIG. 18(a) shows the appearance of the elastic member 70A, and FIG. 18(b) shows the appearance of the elastic member 70A attached to the battery assembly 29. As shown in FIG. 18(a), the elastic member 70A is formed in a rectangular sheet shape. As shown in FIG. 18(b), the elastic member 70A is wrapped around a side surface 290 of the battery assembly 29 to cover the battery assembly 29. In other words, the elastic member 70A covers the side surface 290 of the battery assembly 29. That is, the elastic member 70A is a covering surface that covers the side surface 290 of the battery assembly 29.

[0153] In the elastic member 70A of the first modified example, the length along the extension direction A1 is also longer than the length along the extension direction A1 of the battery assembly 29. Therefore, the elastic member 70A wrapped around and attached to the side surface of the battery assembly 29 protrudes above the battery assembly 29 in the up-down direction. That is, in the extension direction A1, an upper end surface 703 of the elastic member 70A protrudes upward above the battery assembly 29, and a lower end surface 700 of the elastic member 70A protrudes downward below the bottom surface 291 of the battery assembly 29.

[0154] When the elastic member 70A is housed in the battery can 10, the lower end surface 700 comes into contact with the bottom surface 101 of the battery can 10. That is, the bottom surface 291 of the battery assembly 29 is separated from the bottom surface 101 of the battery can 10. Alternatively, there is a gap between the bottom surface 291 of the battery assembly 29 and the bottom surface 101 of the battery can 10. For this reason, an impact applied to the battery can 10 is prevented from being transmitted to the battery assembly 29 via the bottom surface 101.

[0155] When the can lid 51 is attached to the battery can 10, the can lid 51 is pressed from above by the positive electrode contact pressing plate 65 of the can lid 51. As a result, similar to the second embodiment, the thickness of the elastic member 70A increases, and the space between the elastic member 70A and the inner circumferential surface of the side surface 102 of the battery can 10 becomes smaller or is filled. Therefore, even if an impact is applied to the battery can 10, the battery assembly 29 is prevented from moving within the battery can 10.

[0156] The elastic member 70A of the first modified example has a covering surface that covers the side surface 290 of the battery assembly 29. That is, the elastic member 70A covers at least the side surface 290 of the battery assembly 29. In addition, the length of the elastic member 70A in the extension direction A1 is longer than that of the battery assembly 29. This provides the same effects (5) and (6) as those obtained by the second embodiment.

[0157] [Second modified example] 19 is an external perspective view of an elastic member 70B of the second modified example. The elastic member 70B is formed by providing openings in a bottom surface 701 and a side surface 702 of the elastic member 70 of the second embodiment. Specifically, a circular opening 710 is provided near the center of the bottom surface 701, which is the opposing surface of the elastic member 70B. Four openings 711, 712, 713, and 714 are provided in the side surface 702, which is the covering surface of the elastic member 70B. Each of the openings 711, 712, 713, and 714 is formed in a rectangular shape having long sides along the extension direction A1.

[0158] From another perspective, in the elastic member 70B, the upper portion 715 of the side surface 702 is connected to the bottom surface 701 by extensions 716, 717, 718, and 719 extending along the extension direction A1. As a result, the elastic member 70B covers a part of the side surface 290 and a part of the bottom surface 701 of the battery assembly 29.

[0159] When the battery can 10 receives an impact while the elastic member 70B is housed in the battery can 10, the elastic member 70B is deformed (displaced) by the impact. The openings 710, 711, 712, 713, and 714 have a function of releasing the deformation of the elastic member 70B caused by the impact. This improves the cushioning effect of the elastic member 70B against the impact.

[0160] The shape, size, and number of the openings 710, 711, 712, 713, and 714 are not limited to those shown in FIG. 19. Depending on the softness (low rigidity) of the elastic member 70B, which differs depending on the material used to manufacture the elastic member 70B, suitable values ​​are adopted for the shape, size, and number of the openings 710, 711, 712, 713, and 714. For example, in the elastic member 70B with low rigidity, the deformation amount is large upon impact, so it is preferable to make the openings 710, 711, 712, 713, and 714 large. In addition, it is preferable to form the openings 711, 712, 713, and 714 at positions that equally divide the circumference of the side surface 702.

[0161] Also, an opening may be formed in the elastic member 70A of the first modified example. That is, an opening may be formed in the elastic member 70A, which is a covering surface that covers the side surface 290 of the battery assembly 29.

[0162] In the elastic member 70B of the second modification, openings 710, 711, 712, 713, and 714 are provided on the bottom surface 701 and the side surface 702. As a result, when the elastic member 70B is deformed due to an impact applied to the battery can 10, the deformation of the elastic member 70B caused by the impact can be released through the openings 710, 711, 712, 713, and 714. As a result, the shock-absorbing effect of the elastic member 70B against the impact can be improved.

[0163] Although the embodiments of the present disclosure have been specifically described above, they are not limited to the above-described embodiments and can be modified in various ways without departing from the scope of the present disclosure. In each embodiment, components can be added, deleted, or replaced, except for essential components. Unless otherwise specified, each component can be singular or plural.

[0164] In the technology according to the present embodiment, a battery compact, which is a plurality of cells, is sealed and housed in a battery can via an elastic member, thereby suppressing reaction with moisture in the air and improving impact resistance. The present invention, which provides such technology, can contribute to "9. Promote inclusive and sustainable industrial and technological innovation" of the Sustainable Development Goals (SDGs) proposed by the United Nations. [Explanation of symbols]

[0165] 1,1A all-solid-state battery, 10 battery can, 20,20a,20b,20c,20d battery molded body, 21 cell assembly, 29 battery assembly, 30 positive electrode power supply plate, 40,41 negative electrode power supply plate, 50,51 can lid, 61 cap, 62 positive electrode terminal, 63 positive electrode contact, 64 conductive elastic body, 65 positive electrode contact pressing plate, 66 gasket, 70,70A,70B elastic member, 102 side, 103 protrusion, 104 recess, 107 step, 201 positive electrode, 202 negative electrode, 203 solid electrolyte layer, 206 positive electrode tab, 207 negative electrode tab, 210,210a,210b,210c,210d insulating plate, 211 laminate, 301 Tab connection portion, 302 contact connection portion, 610 upper surface, 611 mounting portion, 612 opening, 620 upper surface, 621 side, 630 lower surface, 631 side, 651 support opening, 652 lower surface, 700 lower end surface, 701 bottom surface, 702 side, 703 upper end surface, 710, 711, 712, 713, 714 opening, 715 upper portion, 716, 717, 718, 719 extension portion

Claims

1. a battery molded body having a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode; a positive electrode power supply plate connected to the positive electrode of the battery molded body; a negative electrode power supply plate connected to the negative electrode of the battery molded body; an elastic member having a covering surface that covers at least a side surface of a cell assembly in which the positive electrode power supply plate and the negative electrode power supply plate are attached to the battery molded body; a battery can that houses the cell assembly covered with the elastic member; a can lid portion that seals one end of the battery can in an extension direction of the battery can.

2. The all-solid-state battery according to claim 1 , In the stretching direction, the elastic member is longer than the cell assembly; The elastic member is pressed by the can lid portion provided at one end of the battery can.

3. The all-solid-state battery according to claim 2, the elastic member has a cylindrical shape and has an opposing surface that is connected to the covering surface and faces a bottom surface of the other end of the battery can in the extension direction, The elastic member accommodates the cell assembly inside the cylindrical shape.

4. The all-solid-state battery according to claim 3, an opening is provided in the covering surface and the opposing surface of the elastic member.

5. The all-solid-state battery according to claim 4, The elastic member is formed of a low-resilience soft material.

6. The all-solid-state battery according to claim 1 , The can lid portion is An electrode terminal; A conductive electrode contact that contacts the positive current supply plate or the negative current supply plate; a conductive elastic body provided between the electrode terminal and the electrode contact, the conductive elastic body applying a force along the extension direction to the electrode contact.

7. The all-solid-state battery according to claim 1 , an outer peripheral edge of the can lid portion is crimped to the battery can at the one end, thereby sealing the one end of the battery can.

8. The all-solid-state battery according to claim 1 , the battery molded body has a positive electrode tab connected to the positive electrode and a negative electrode tab connected to the negative electrode, the positive electrode tab is connected to the positive electrode power supply plate, and the negative electrode tab is connected to the negative electrode power supply plate.

9. The all-solid-state battery according to claim 1 , a plurality of the battery molded bodies are arranged inside the battery can along the stretching direction.

10. The all-solid-state battery according to claim 9, The plurality of battery molded bodies are arranged with insulating plates interposed between them.

11. a first step of producing a laminate having a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode, a positive electrode tab connected to the positive electrode, and a negative electrode tab connected to the negative electrode, and attaching the positive electrode tab to the positive electrode of the laminate and the negative electrode tab to the negative electrode of the laminate to produce a battery molded body; a second step of manufacturing a cell assembly by stacking a plurality of the battery molded bodies to which the positive electrode tabs and the negative electrode tabs are attached, and attaching a positive electrode power supply plate and a negative electrode power supply plate to the positive electrode tabs and the negative electrode tabs attached to each of the plurality of battery molded bodies; a third step of covering at least a side surface of the cell assembly with an elastic member; a fourth step of housing the cell assembly covered with the elastic member in a battery can; and a fifth step of attaching a can lid portion to one end of the battery can in an extension direction of the battery can.

Images