All-solid-state battery and method for manufacturing all-solid-state battery

Abstract

The all-solid-state battery (1) comprises: a bottomed cylindrical battery can (10) that houses a battery assembly (21), the battery assembly having: a battery molded body (20) having a positive electrode (201), a negative electrode (202) and a solid electrolyte layer (203); a positive electrode power supply plate (30) connected to the positive electrode (201) of the battery molded body (20); and a negative electrode power supply plate (40) connected to the negative electrode (202) of the battery molded body (20); and a can lid (50) that seals an opening at one end of the battery can (10). The can lid (50) has conductive electrode terminals (52) and an insulating portion (53) disposed around the electrode terminals (52). The battery molded body (20) and the insulating portion (53) are arranged along an axis (X1) intersecting the bottom surface (101) of the battery can (10). The compression direction of the battery molded body (20) and the insulating part (53) is along the axis (X1) towards the bottom surface (101) of the battery can (10).

Description

Technical Field

[0001] This disclosure relates to an all-solid-state battery and a method for manufacturing an all-solid-state battery. Background Technology

[0002] Lithium-ion batteries, particularly lithium-ion batteries, have long been used in portable electronic devices such as mobile phones and laptops, as well as in electric vehicles. Lithium-ion batteries contain flammable organic solvents as a non-aqueous electrolyte. Due to the development of these devices and electric vehicles, lithium-ion batteries are becoming increasingly energy-dense, leading to a tendency for the amount of flammable organic solvents to increase. Consequently, there are further demands on the reliability of lithium-ion batteries.

[0003] Under these circumstances, all-solid-state lithium-ion batteries (all-solid-state secondary batteries) that do not use organic solvents have attracted attention. All-solid-state secondary batteries use a solid electrolyte without organic solvents to replace the conventional organic solvent-based electrolyte. In an all-solid-state secondary battery, it is configured as a laminate containing a positive electrode layer, a negative electrode layer, and a solid electrolyte layer.

[0004] Patent document 1 discloses a battery in which a laminate is housed within a space formed by a casing and a cover.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2004-253287 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] Laminated structures are formed by compressing solid (powder) materials. However, their strength decreases due to expansion at high temperatures and contraction at low temperatures, making them susceptible to breakage if subjected to impacts. On the other hand, there is a demand for all-solid-state batteries that can operate in both high and low temperature environments.

[0010] Methods for solving problems

[0011] If we simply illustrate a summary of representative embodiments disclosed in this application, it will be as follows.

[0012] According to one embodiment, an all-solid-state battery includes: a bottomed cylindrical battery can housing a battery assembly, the battery assembly comprising: a battery molded body having a positive electrode, a negative electrode, and a solid electrolyte layer between the positive and negative electrodes; a positive electrode power supply plate connected to the positive electrode of the battery molded body; and a negative electrode power supply plate connected to the negative electrode of the battery molded body; and a can lid portion sealing an opening at one end of the battery can. The can lid portion has conductive electrode terminals electrically connected to the positive or negative electrode power supply plate and an insulating portion disposed around the electrode terminals. The battery molded body and the insulating portion are arranged along an axial direction intersecting the bottom surface of the battery can. The compression direction of the battery molded body and the insulating portion is along the axial direction toward the bottom surface of the battery can.

[0013] According to one embodiment of a method for manufacturing an all-solid-state battery, the method includes: a first step in which a positive electrode mixture, a negative electrode mixture, and a solid electrolyte are compressed along a first compression direction to form a laminate having a positive electrode, a negative electrode, and a solid electrolyte layer 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 are manufactured; the positive electrode tab is attached to the positive electrode of the laminate; the negative electrode tab is attached to the negative electrode of the laminate; and a battery molded body is manufactured; a second step in which the solid electrolyte layer attached to the battery molded body is further processed. A battery assembly is manufactured by mounting a positive electrode tab and a negative electrode tab on the positive electrode tab and the negative electrode tab, respectively; in the third step, the battery assembly is housed by compressing the first compression direction along an axial direction that intersects the bottom surface of the bottom cylindrical battery can; in the fourth step, insulating material is compressed in a second compression direction to form an insulating part, and a can cover having the insulating part and electrode terminals as conductive material is integrally formed; and in the fifth step, the can cover is mounted to one end of the battery can by compressing the second compression direction along the axial direction.

[0014] Invention Effects

[0015] According to one embodiment, an all-solid-state battery that can be used in both high-temperature and low-temperature environments can be provided. Attached Figure Description

[0016] Figure 1 This is a perspective view of the all-solid-state battery according to the implementation method.

[0017] Figure 2 yes Figure 1 A cross-sectional view of an all-solid-state battery with an AA line.

[0018] Figure 3 This is an exploded 3D view of the battery assembly.

[0019] Figure 4 This is a three-dimensional view of the battery molding.

[0020] Figure 5 This is a 3D view of the bracket's appearance.

[0021] Figure 6 This is a 3D view of the can lid.

[0022] Figure 7 This is a diagram illustrating the connection to the power supply board.

[0023] Figure 8 This is a flowchart illustrating the manufacturing direction of all-solid-state batteries.

[0024] Figure 9 This is a diagram illustrating the method of forming a laminated body.

[0025] Figure 10 This is a schematic diagram illustrating a stacked structure.

[0026] Figure 11 This diagram illustrates the manufacturing process of the battery molded body.

[0027] Figure 12 This is a diagram illustrating the manufacturing process of battery modules.

[0028] Figure 13 This is a diagram illustrating the manufacturing process of battery modules.

[0029] Figure 14 This is a diagram illustrating the manufacturing process of battery modules.

[0030] Figure 15 This is a diagram illustrating the manufacturing process of battery modules.

[0031] Figure 16 This is a diagram illustrating the manufacturing process of battery modules.

[0032] Figure 17 This diagram illustrates the process of housing the battery components in the battery can.

[0033] Figure 18 This diagram illustrates the process of housing the battery components in the battery can.

[0034] Figure 19 This diagram illustrates the manufacturing process of the can lid.

[0035] Figure 20 This diagram illustrates the process of installing the can lid onto the battery can.

[0036] Figure 21 This is a perspective view of the all-solid-state battery with a buffer component installed on the can lid. Detailed Implementation

[0037] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to label the same parts in principle, and repeated descriptions are omitted. In the drawings, for ease of understanding of the invention, the representation of constituent elements does not always indicate their actual position, size, shape, or extent.

[0038] <Implementation Method>

[0039] Hereinafter, an all-solid-state battery according to one embodiment of the present disclosure will be described with reference to the accompanying drawings. Figure 1 This is a perspective view of the all-solid-state battery 1 according to the embodiment. Figure 2 yes Figure 1 A cross-sectional view of the all-solid-state battery 1 at line AA. Furthermore, while the term "all-solid-state battery" is used in the following description of the embodiments, it can also be used interchangeably with terms such as stacked solid-state battery, battery module, etc.

[0040] The all-solid-state battery 1 includes a battery canister 10, a battery assembly 21, a canister cap 50, and a power supply board 60. The battery assembly 21 is housed inside the battery canister 10 and includes a battery molded body 20, a support 22, a positive power supply board 30, and a negative power supply board 40. In addition, the support 22 has a support portion.

[0041] <Battery Can 10>

[0042] The battery can 10 is a cylindrical shape with a bottom, open on one side and closed on the other. Specifically, as shown in the figure, the battery can 10 is a cylindrical can formed into a bottomed cylindrical shape. Inside the battery can 10 are housed the battery molded body 20, the positive electrode power supply plate 30, and the negative electrode power supply plate 40, which will be described in detail later.

[0043] Furthermore, the battery can 10 is not limited to a cylindrical can; depending on the shape of the battery molded body 20 housed inside, it can also be a rectangular can or the like.

[0044] The battery canister 10 has a bottom surface 101 and a side surface 102. The side surface 102 is connected to the bottom surface 101 and extends along a direction intersecting the bottom surface 101, or, depending on the placement, along the height direction or laterally, or more specifically, along an orthogonal direction.

[0045] From now on, we will define an axis X1 that passes through the center of the bottom surface 101 and extends in a direction orthogonal to the bottom surface 101 for the following description. Sometimes, the side of the battery can 10 with the bottom surface 101 is referred to as the "bottom" along the axis X1, and the front side (i.e., the side that is away from the bottom surface 101 of the battery can 10) is referred to as the "top". Alternatively, sometimes the top is referred to as one side of the battery can 10, and the bottom is referred to as the other side of the battery can 10.

[0046] The battery canister 10 is formed of a conductive material, such as aluminum, stainless steel, nickel alloy, or other metallic materials. When the battery canister 10 is electrically connected to the negative or positive electrode described later, the material of the battery canister 10 can be selected in a way that does not cause corrosion of the battery canister 10 or material degradation due to alloying with lithium ions.

[0047] On the outer peripheral wall of the side 102 of the battery can 10, a plurality of recesses 104 extending upward from the lower end along the axis X1 are formed, for example by stamping. This increases the rigidity of the battery can 10 and prevents the battery can 10 from being easily crushed or damaged when a strong force is applied to it from the outside.

[0048] By forming a recess 104, a protrusion protruding toward the interior of the battery can 10 is formed on the inner peripheral wall of the side surface 102 of the battery can 10 at the location where the recess 104 is formed. This protrusion contacts the side surface of the battery molded body 20 when it is housed inside the battery can 10. This suppresses vibration of the battery molded body 20 inside the battery can 10.

[0049] Alternatively, the recess 104 may not be formed on the outer peripheral wall of the side surface 102 of the battery canister 10. In this case, the battery molded body 20 and the inner peripheral wall of the side surface 102 of the battery canister 10 can be fixed by bonding. Alternatively, a sealing member, such as one made of a non-conductive material like resin, can be provided to fill the gap between the battery molded body 20 and the inner peripheral wall of the side surface 102 of the battery canister 10.

[0050] <Battery Component 21>

[0051] The battery assembly 21 is housed within the battery can 10 with a soft, insulating elastomer, such as silicone rubber, as a buffer sheet 105 spaced between it and the bottom surface 101 of the battery can 10. Alternatively, the buffer sheet 105 may not be provided.

[0052] As described above, the battery assembly 21 includes a battery molded body 20, a support 22, a positive electrode power supply plate 30, and a negative electrode power supply plate 40. Figure 2 As shown, the battery assembly 21 of this embodiment has six battery molded bodies 20 (20a, 20b, 20c, 20d, 20e, 20f). However, the number of battery molded bodies 20 is not limited to six; it can be more than six or less than six. Furthermore, in the following description, each battery molded body 20 will sometimes be referred to as a battery.

[0053] Figure 3This is an exploded perspective view of the battery assembly 21. The battery assembly 21 comprises multiple battery-shaped bodies 20 (20a, 20b, 20c, 20d, 20e, 20f) and insulating plates 210 (210a, 210b, 210c, 210d, 210e) stacked along axis X1. That is, in the battery assembly 21, multiple battery-shaped bodies 20 are arranged along axis X1. Therefore, multiple battery-shaped bodies 20 can be housed within the cylindrical battery canister 10, thus preventing the all-solid-state battery 1 from becoming too large.

[0054] Multiple stacked battery molded bodies 20 are held by a support 22 from below, the sides, and above. Furthermore, each of the multiple battery molded bodies 20 has a positive electrode tab 206 connected to a positive power supply plate 30. Each of the multiple battery molded bodies 20 has a negative electrode tab 207 connected to a negative power supply plate 40.

[0055] The sides of the battery assembly 21 are covered by non-conductive heat-shrink tubing 213, such as polyethylene or various elastomers. That is, the multiple battery molded bodies 20, the support 22, the positive electrode power supply plate 30, and the negative electrode power supply plate 40 are covered by heat-shrink tubing 213. However, the second holding portion 24, located at the top of the battery assembly 21 (described later), is not covered by heat-shrink tubing 213. Furthermore, the areas near the upper ends of the positive electrode power supply plate 30 and the negative electrode power supply plate 40 are not covered by heat-shrink tubing 213.

[0056] <Battery Molded Body 20>

[0057] Each battery formed body 20 is a laminate 211 composed of a formed body (layer) of a positive electrode 201, a formed body (layer) of a negative electrode 202, and a solid electrolyte layer 203. Specifically, in the battery formed body 20, a solid electrolyte layer 203 is laminated between the positive electrode 201 and the negative electrode 202. Furthermore, in... Figure 2 , Figure 3 The image shows a battery molded body 20 formed into a cylindrical shape. However, the shape of the battery molded body 20 is not limited to a cylindrical shape; it can also be a polygonal column such as a rectangular column.

[0058] like Figure 2 As shown, a polarizing plate 201a is mounted on one side of the laminate 211, that is, on the side where the positive electrode 201 is formed. The polarizing plate 201a is formed into a circular plate shape according to the shape of the cylindrical laminate 211. In addition, when the laminate 211 is prismatic, the polarizing plate 201a is also formed into a polygonal plate shape corresponding to the shape of the laminate 211.

[0059] A positive electrode tab 206 is joined to the polarity plate 201a, for example, by resistance welding. A polarity plate 202a is mounted on the other side of the laminate 211, the side where the negative electrode 202 is formed. A negative electrode tab 207 is joined to the polarity plate 202a, for example, by resistance welding. Furthermore, the polarity plate 202a is also formed in a shape corresponding to the shape of the laminate 211.

[0060] The sides, a portion of the upper surface, and a portion of the lower surface of the laminate 211 are covered by a non-conductive heat-shrinkable tube 212 made of, for example, a polymer such as polyethylene or various elastomers.

[0061] <Positive Electrode 201>

[0062] The positive electrode 201 is a cylindrical shaped body (layer) formed by compressing (pressing) a positive electrode compound. However, the positive electrode 201 is not limited to a cylindrical shape; it can also be a prismatic layer. The positive electrode compound is not particularly limited to any positive electrode active material used in lithium-ion secondary batteries, i.e., a material capable of intercalating and deintercalating lithium ions. Specifically, LiM... x Mn 2-x O4 (where 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, 0.01≤x≤0.5) represents spinel-type lithium manganese composite oxides, and Li x Mn （1-y-x） Ni y M z O （2-k） F l (Where 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) represents a layered compound, denoted as LiCo 1-x M x Lithium-cobalt composite oxides represented by O2 (where 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, 0 ≤ x ≤ 0.5), and LiNi 1-x M xLithium-nickel composite oxides represented by O2 (where 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, 0≤x≤0.5), and LiM 1-x N x PO4 (where M is at least one element selected from the group consisting of Fe, Mn, and Co, and 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, 0 ≤ x ≤ 0.5) represents an olivine-type composite oxide, denoted as Li4Ti5O 12 The lithium-titanium composite oxides, etc., can be used alone or in combination with two or more.

[0063] The average particle size of the positive electrode active material is preferably 1 μm or more, more preferably 2 μm or more, and preferably 10 μm or less, more preferably 8 μm or less. Furthermore, the positive electrode active material can be primary particles or secondary particles formed by the aggregation of primary particles. Using a positive electrode active material with an average particle size within the above-mentioned range increases the interface with the solid electrolyte, thereby further improving the battery's load characteristics.

[0064] The positive electrode active material preferably has a reaction inhibition layer on its surface to inhibit the reaction with the solid electrolyte.

[0065] In the formed body of the positive electrode compound, if the positive electrode active material comes into direct contact with the solid electrolyte, the solid electrolyte will oxidize and form a resistive layer, which may reduce the ionic conductivity within the formed body. By setting a reaction inhibition layer on the surface of the positive electrode active material to inhibit the reaction with the solid electrolyte, direct contact between the positive electrode active material and the solid electrolyte can be prevented, thus suppressing the reduction in ionic conductivity within the formed body caused by the oxidation of the solid electrolyte.

[0066] The reaction inhibition layer can be made of any material that has ion conductivity and can inhibit the reaction between the positive electrode active material and the solid electrolyte. Examples of materials that can constitute the reaction inhibition 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, examples include Nb-containing oxides such as LiNbO3, Li3PO4, Li3BO3, Li4SiO4, Li4GeO4, LiTiO3, and LiZrO3. The reaction inhibition layer may contain only one of these oxides, or it may contain two or more, and furthermore, multiple oxides may form a composite compound. Among these oxides, Nb-containing oxides are preferred, and LiNbO3 is more preferred.

[0067] The reaction inhibition layer is preferably present on the surface at a concentration of 0.1 to 1.0 parts by mass relative to 100 parts by mass of the positive electrode active material. If it is within this range, the reaction between the positive electrode active material and the solid electrolyte can be effectively inhibited.

[0068] Methods for forming a reaction-inhibiting layer on the surface of a positive electrode active material include sol-gel method, mechanical fusion method, CVD method, PVD method, etc.

[0069] The content of the positive electrode active material in the positive electrode mixture is preferably 60-95% by mass.

[0070] Examples of conductive additives for the positive electrode 201 include graphite (natural graphite, artificial graphite), graphene, carbon black, carbon nanofibers, carbon nanotubes, and other carbon materials. The preferred content of the conductive additive in the positive electrode mixture is 1-10% by mass.

[0071] In the solid electrolyte of the positive electrode 201, one or more of the following types of solid electrolytes—sulfide-based, hydride-based, and oxide-based—can be used as the material for the negative electrode 202. To improve battery performance, a solid electrolyte containing a sulfide-based electrolyte is preferred.

[0072] The content of solid electrolyte in the positive electrode mixture is preferably 4-30% by mass.

[0073] The positive electrode binder may or may not contain a resin-based binder. Examples of resin-based binders include fluororesins such as polyvinylidene fluoride (PVDF). However, since the resin-based binder functions as a resistive component in the positive electrode binder, its amount is preferably as small as possible. Therefore, it is preferable that the positive electrode binder does not contain a resin-based binder, or if it does contain one, its content is set to 0.5% by mass or less. More preferably, the content of the resin-based binder in the positive electrode binder is 0.3% by mass or less, and even more preferably 0% by mass (i.e., it does not contain a resin-based binder).

[0074] When a current collector is used in the positive electrode 201, the current collector can be made of metals such as aluminum, stainless steel, foil, perforated metal, mesh, expanded metal, foamed metal, carbon sheet, etc.

[0075] The positive electrode compound can be formed, for example, by compressing a positive electrode compound prepared by mixing a positive electrode active material, a conductive additive, a solid electrolyte, and a binder added as needed, using a pressure molding process.

[0076] In the case of a positive electrode having a current collector, it can be manufactured by bonding a molded body of a positive electrode mixture formed using the method described above to the current collector by pressing or other means.

[0077] The thickness of the positive electrode compound (in the case of a positive electrode 201 having a current collector, the thickness of the positive electrode compound on each side of the current collector; the same applies below) is preferably 200 μm or more from the viewpoint of increasing battery capacity. Furthermore, the thickness of the positive electrode compound is typically 2000 μm or less.

[0078] A positive electrode tab 206 is installed on 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 the positive power supply board 30, which will be described later, by welding.

[0079] <Negative Electrode 202>

[0080] The negative electrode 202 is a cylindrical shaped body (layer) formed by compressing the negative electrode compound under pressure (stamping). In addition, the negative electrode is not limited to a cylindrical layer, but can also be a prismatic layer. The negative electrode compound can be composed of the negative electrode active material used in lithium-ion secondary batteries. There are no particular restrictions on the negative electrode active material as long as it is a material that can insert and extract lithium ions. Examples include carbon-based materials that can insert and extract lithium such as graphite, thermally decomposed carbon, coke, glassy carbon, sintered organic polymers, mesophase carbon microspheres (MCMB), and carbon fibers; elemental substances or oxides or alloys of elements that can form alloys with lithium such as Si, Sn, Ge, Bi, Sb, and In; nitrides containing transition metals such as Co, Ni, Mn, Fe, Cr, Ti, and W and lithium; lithium metal; lithium alloys such as lithium-aluminum alloys; lithium-containing transition metal oxides such as lithium niobium oxide and lithium titanium oxide. As lithium titanium oxide, examples include lithium titanium oxide represented by the following general formula (1).

[0081] Li[Li 1 / 3-a M 1 a Ti 5 / 3-b M 2 b O4 (1)

[0082] In general formula (1), M 1 M is selected from at least one element in the group consisting of Na, Mg, K, Ca, Sr, and Ba. 2 The element is selected from at least one element in 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.

[0083] That is, in lithium titanium oxide represented by general formula (1), a portion of the Li sites can be affected by element M. 1 Permutation. In general formula (1), M represents element M. 1The ratio 'a' is preferably less than 1 / 3. In lithium titanium oxide represented by general formula (1), Li may not be affected by element M. 1 Substitution, therefore representing element M 1 The ratio 'a' can be 0.

[0084] Furthermore, in lithium titanium oxide represented by general formula (1), element M 2 It is a component used to improve the electronic conductivity of lithium titanium oxide, and is represented by element M. 2 When the ratio b is 0 ≤ b ≤ 2 / 3, the improvement in electronic conductivity can be well ensured.

[0085] One or more of the materials exemplified above can be used as the negative electrode active material. For example, when using lithium titanium oxide, negative electrode active materials other than lithium titanium oxide can also be used together with lithium titanium oxide. However, the proportion of negative electrode active materials other than lithium titanium oxide in the total amount of negative electrode active material is preferably 30% or less by mass.

[0086] As for the solid electrolyte used as the negative electrode 202, there are no particular limitations as long as it has lithium-ion conductivity. For example, sulfide-based solid electrolytes, hydride-based solid electrolytes, oxide-based solid electrolytes, etc. can be used.

[0087] Examples of sulfide-based solid electrolytes include Li₂S-P₂S₅, Li₂S-SiS₂, Li₂S-P₂S₅-GeS₂, and Li₂S-B₂S₃ glass. In addition, Li₂S, which has gained attention in recent years for its high lithium-ion conductivity, can also be used. 10 GeP2S 12 (LGPS series) and Li6PS5Cl (silver-germanium sulfide series). Among them, the silver-germanium sulfide series material with high lithium-ion conductivity and high chemical stability is particularly preferred.

[0088] Examples of hydride-based solid electrolytes include LiBH4, solid solutions of LiBH4 with alkali metal compounds (e.g., solid solutions with a molar ratio of LiBH4 to an alkali metal compound of 1:1 to 20:1). Examples of alkali metal compounds in these solid solutions include 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 amides, rubidium amides, and cesium amides.

[0089] Examples of oxide-based solid electrolytes include Li7La3Zr2O. 12 , LiTi(PO4)3, LiGe(PO4)3, LiLaTiO3, etc.

[0090] The solid electrolyte can be one or more of the substances previously exemplified. Among the solid electrolytes exemplified above, sulfide-based solid electrolytes are more preferred from the perspective of high lithium-ion conductivity and the function of improving the formability of the negative electrode compound.

[0091] As a conductive additive for the negative electrode 202, carbon materials such as carbon black can be used.

[0092] The negative electrode mixture may or may not contain a binder. When the negative electrode mixture contains a binder, fluoropolymers such as polyvinylidene fluoride (PVDF) can be used as the binder.

[0093] When a current collector is used in the negative electrode 202, the current collector can be made of copper, nickel, stainless steel, aluminum foil, perforated metal, mesh, expanded metal, foamed metal, carbon sheet, etc.

[0094] The negative electrode 202 can be manufactured by preparing a negative electrode mixture by mixing lithium titanium oxide particles (as the active material), a solid electrolyte, and a conductive additive, for example, without using a solvent, and then shaping it into granules. Alternatively, the negative electrode 202 can be formed by bonding the shaped negative electrode mixture obtained as described above to a current collector.

[0095] Alternatively, the above-mentioned negative electrode agent can be mixed with a solvent to prepare a composition containing the negative electrode agent, which is then coated onto a substrate such as a current collector and a solid electrolyte layer 203 opposite to the negative electrode 202, dried, and then stamped to form a molded body of the negative electrode agent.

[0096] The solvent used in the composition containing the negative electrode agent is preferably a solvent that does not easily degrade the solid electrolyte. In particular, since sulfide-based and hydride-based solid electrolytes undergo chemical reactions through trace amounts of water, nonpolar and aprotic solvents, such as hydrocarbon solvents like hexane, heptane, octane, nonane, decane, decahydronaphthalene, toluene, and xylene, are preferred. In particular, ultra-dehydrating solvents with a water content of 0.001% by mass (10 ppm) or less are more preferred. In addition, fluorinated solvents such as "Vertrel (registered trademark)" manufactured by Mitsui-DuPont Fluorochemicals, "ZEORORA (registered trademark)" manufactured by ZEON Corporation of Japan, and "Novec (registered trademark)" manufactured by Sumitomo 3M Corporation, as well as non-aqueous organic solvents such as dichloromethane and diethyl ether, can also be used.

[0097] As a component of the negative electrode binder, for example, the content of the negative electrode active material is preferably 50-80% by mass, the content of the solid electrolyte is preferably 20-50% by mass, and the content of the conductive additive is preferably 0.1-10% by mass. Furthermore, if the negative electrode binder contains a binder, its content is preferably 0.1-10% by mass. Moreover, the thickness of the molded body of the negative electrode binder (including both cases where the negative electrode does not have a current collector and cases where it does have a current collector) is preferably 50-1000 μm.

[0098] A negative electrode tab 207 is installed on 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 the negative power supply board 40, which will be described later, by soldering.

[0099] <Solid Electrolyte Layer 203>

[0100] The solid electrolyte in the solid electrolyte layer 203 may be one or more of the same substances as those exemplified above as the solid electrolyte used as the negative electrode 202. However, in order to improve battery performance, it is preferable to include a sulfide-based solid electrolyte, and more preferably, the positive electrode 201, the negative electrode 202, and the solid electrolyte layer 203 may all contain a sulfide-based solid electrolyte.

[0101] The solid electrolyte layer 203 can have a porous material such as resin-made nonwoven fabric as a support.

[0102] The solid electrolyte layer 203 is a cylindrical shaped body (layer) formed by compressing (stamping) a solid electrolyte using methods such as pressure forming. However, the solid electrolyte layer is not limited to a cylindrical shape; it can also be a prismatic shape. Alternatively, the solid electrolyte layer can be formed by coating a composition for forming the solid electrolyte layer 203 (prepared by dispersing the solid electrolyte in a solvent) onto a substrate, a positive electrode, and a negative electrode, drying it, and then performing pressure forming, such as stamping, as needed.

[0103] The solvent used in the composition for forming the solid electrolyte layer 203 is, in the same manner as the solvent used in the composition containing the negative electrode agent, preferably one that does not easily degrade the solid electrolyte. As the solvent for the composition containing the negative electrode agent, the various solvents previously exemplified are preferred, and a super-dehydrating solvent with a water content of 0.001% by mass (10 ppm) or less is particularly preferred. The thickness of the solid electrolyte layer 203 is preferably 10 to 200 μm.

[0104] <Arrangement of battery molding body 20>

[0105] In the battery assembly 21, six battery molded bodies 20a, 20b, 20c, 20d, 20e, and 20f are arranged sequentially (stacked) from bottom to top along axis X1. Each battery molded body 20 is arranged with the negative electrode 202 facing downwards and the positive electrode 201 facing upwards. However, the arrangement is not limited to the negative electrode 202 facing downwards; the positive electrode 201 can also be arranged facing downwards. Furthermore, the battery molded bodies 20 can be arranged in parallel, in series, or a combination of both. Therefore, the battery molded bodies 20 can be configured according to the required voltage or current and available space.

[0106] Figure 4 (A) is a perspective view of a battery molded body 20 (20a, 20b, 20c, 20d, 20e). Figure 4 (B) is a perspective view of a battery molded body 20 (20f). As described above, the battery molded body 20 is based on a laminate 211 formed by compression molding. In the following description, the thickness direction of the compression-formed laminate 211, i.e., the thickness direction of the battery molded body 20, is referred to as the first direction L1. It can also be said that a plurality of battery molded bodies 20 are stacked along the axis X1 along the first direction L1.

[0107] The positive electrode tab 206, which is connected to the positive electrode 201 of the battery molded body 20, has a main portion 206a and a connecting portion 206b. The main portion 206a is formed into a plate shape extending in a direction intersecting the first direction L1. The main portion 206a is joined to the polarity sheet 201a mounted on the positive electrode 201 by means of, for example, resistance welding, and is electrically connected to the positive electrode 201.

[0108] like Figure 4 As shown in (A), the connecting portion 206b provided on the battery molded bodies 20a, 20b, 20c, 20d, and 20e is connected to one end of the main portion 206a and extends along the direction intersecting the main portion 206a, i.e., the first direction L1. In this embodiment, the direction intersecting the main portion 206a is the direction orthogonal to the main portion 206a.

[0109] like Figure 4 As shown in (B), in the positive electrode tab 206 of the uppermost battery molded body 20f, a connecting portion 206b is formed via an upright portion 206c extending upward along the first direction L1 from the end of the main portion 206a. The connecting portion 206b extends along the first direction L1. As will be described in detail later, the connecting portion 206b is bent after being housed in the bracket 22 described later, and extends in a direction intersecting the first direction L1. In this embodiment, the direction intersecting the first direction L1 in which the connecting portion 206b extends is a direction orthogonal to the first direction L1.

[0110] The connecting part 206b is joined to the positive electrode power supply plate 30 by resistance welding or the like. Thus, the positive electrode 201 of the battery molded body 20 is electrically connected to the positive electrode power supply plate 30.

[0111] The negative electrode tab 207, which is connected to the negative electrode 202 of the battery molded body 20, has a main portion 207a and a connecting portion 207b. The main portion 207a is formed as a plate extending in a direction intersecting the first direction L1. The main portion 207a is joined to the polarity sheet 202a mounted on the negative electrode 202 by means of, for example, resistance welding, and is electrically connected to the negative electrode 202.

[0112] The connecting portion 207b is connected to the end of the main portion 207a and extends along a first direction L1, which is perpendicular to the main portion 207a. The connecting portion 207b extends from the surface of the negative electrode 202 along the first direction L1 toward the positive electrode 201.

[0113] like Figure 4 (A) Figure 4 As shown in (B), the negative electrode tab 207 is installed at a position symmetrical about the connection portion 207b of the negative electrode tab 207 and the connection portion 206b of the positive electrode tab 206 with respect to the central axis of the cylindrical battery molded body 20 (i.e., the connection portions 206b and 207b are opposite each other). The connection portion 207b is joined to the negative power supply plate 40, for example, by resistance welding. Thus, the negative electrode 202 of the battery molded body 20 is electrically connected to the negative power supply plate 40.

[0114] like Figure 2 , Figure 3 As shown, a soft elastomer, such as silicone rubber, i.e., an insulating plate 210, is disposed between each battery molded body 20. Specifically, an insulating plate 210a is disposed between the upper surface of battery molded body 20a and the lower surface of battery molded body 20b. An insulating plate 210b is disposed between the upper surface of battery molded body 20b and the lower surface of battery molded body 20c. An insulating plate 210c is disposed between the upper surface of battery molded body 20c and the lower surface of battery molded body 20d. An insulating plate 210d is disposed between the upper surface of battery molded body 20d and the lower surface of battery molded body 20e. An insulating plate 210e is disposed between the upper surface of battery molded body 20e and the lower surface of battery molded body 20f.

[0115] The insulating plate 210 is formed into a circular plate shape according to the cylindrical shape of each battery molded body 20. However, the insulating plate 210 is not limited to being formed into a circular plate shape, but can be formed into a shape corresponding to the shape of the battery molded body 20. For example, when the battery molded body 20 is prism-shaped, the insulating plate 210 is formed into a polygonal plate shape.

[0116] By configuring the insulating plate 210, the battery molded bodies 20a, 20b, 20c, 20d, 20e, and 20f can be arranged in an insulated state. Furthermore, the insulating plate 210, being a soft elastomer, buffers impacts on the battery molded bodies 20 stacked along the X1 axis in the X1 direction. Additionally, the insulating plate 210, being a soft elastomer, suppresses the application of load stress to the joints of the positive electrode tab 206 and the negative electrode tab 207 of the battery molded bodies 20 stacked along the X1 axis.

[0117] <Standard 22>

[0118] The support 22 holds a plurality of battery molded bodies 20 arranged along axis X1 (first direction L1). The support 22 is made of, for example, a resin material such as polypropylene that has insulating, bending resistance, and non-absorbent properties. The support 22 has a first holding portion 23 and a second holding portion 24. The first holding portion 23 holds the lower and side surfaces of the stacked plurality of battery molded bodies 20. The second holding portion 24 holds the upper surface of the uppermost battery molded body 20f among the stacked plurality of battery molded bodies 20.

[0119] like Figure 3 As shown, the first holding portion 23 has a bottom holding portion 231 and four side holding portions 232. Furthermore, the number of side holding portions 232 is not limited to four; it can be more or less than four. The bottom holding portion 231 is a circular plate shape corresponding to the shape of the cylindrical battery molded body 20. Additionally, when the battery molded body 20 is prismatic, the bottom holding portion 231 is formed as a polygonal plate.

[0120] The side retaining portion 232 extends along the axis X1 and connects to the bottom retaining portion 231 at its lower end. The four side retaining portions 232 are arranged at 90-degree intervals in the circumferential direction of the bottom retaining portion 231. A hook-shaped curved portion 232a is formed on the upper part of the side retaining portion 232.

[0121] Figure 5 (A) is a perspective view of the first retaining part 23 during its forming process. (As shown) Figure 5 As shown in (A), the four side retaining portions 232 extend radially outward from the circumference of the bottom retaining portion 231. This is achieved by using the bend 232b near the connection point between the side retaining portion 232 and the bottom retaining portion 231 as a fulcrum... Figure 5 (A) shows a bend in direction A1, where the first retaining part 23 becomes Figure 3 The shape shown.

[0122] The battery molded body 20 (described later) is housed within the space surrounded by the bottom retaining portion 231 and the side retaining portions 232. When housing the battery molded body 20, as follows... Figure 3As shown, the curved portion 232a of the side retaining portion 232 is inclined radially outward relative to the axis X1. Therefore, the upper end of the side retaining portion 232 will not become an obstacle when the battery molded body 20 is housed in the first retaining portion 23, thus improving workability.

[0123] In addition, such as Figure 3 As shown, a sheet 233, for example made of silicone, is disposed between the bottom holding portion 231 and the battery molded body 20a. The sheet 233 is provided to facilitate rotation of the battery molded body 20 relative to the support 22 during the manufacture of the battery assembly 21, which will be described in detail later. By rotating the battery molded body 20 on the sheet 233, the position adjustment work of aligning the positive electrode tabs 206 of each battery molded body 20 housed in the support 22 in the X1 axis direction and aligning the negative electrode tabs 207 in the X1 axis direction becomes easier. Alternatively, the sheet 233 may not be provided.

[0124] When the battery molded body 20 is housed within the first retaining portion 23, the upper part of the side retaining portion 232 extends towards the lower end portion 232c of the curved portion 232a as a fulcrum. Figure 3 The bending occurs in the A2 direction as shown. Consequently, the contact surface 232d of the bent portion 232a, which is above the lower end portion 232c, contacts the upper surface of the uppermost battery molded body 20f. Furthermore, the upper front end portion 232e, formed above the side-retaining portion 232 above the contact surface 232d, extends upward along the axis X1. A latch portion protruding outward is formed on the upper front end portion 232e.

[0125] Figure 5 (B) is a perspective view of the second retaining portion 24. The second retaining portion 24 has two semi-circular portions 240 and 241 and a rectangular receiving portion 242. The receiving portion 242 is disposed between the semi-circular portions 240 and 241, connected to one wall surface of the semi-circular portion 240 and to the semi-circular portion 241 on a wall surface opposite to the other wall surface. The upper surface of the receiving portion 242 is lower than the upper surfaces of the semi-circular portions 240 and 241. That is, the receiving portion 242 forms a recess relative to the semi-circular portions 240 and 241.

[0126] The upper surface of the storage section 242 houses the connecting portion 206b, which is bent in a direction intersecting the axis X1 (i.e., the first direction L1), in the positive electrode tab 206 of the uppermost battery molded body 20f. Furthermore, the storage section 242 houses the contact point connecting portion 302 of the positive electrode power supply plate 30, which will be described later, above the housing connecting portion 206b.

[0127] Two receiving openings 243 are formed circumferentially at intervals of, for example, every 90 degrees in the semicircular portions 240 and 241. The receiving openings 243 are through holes that penetrate the semicircular portions 240 and 241 in the vertical direction. The circumferential length of the receiving openings 243 is approximately equal to the width of the side retaining portion 232 of the first retaining portion 23, and the radial length of the receiving openings 243 is approximately equal to the thickness of the side retaining portion 232.

[0128] When the second retaining part 24 is disposed on the upper part of the battery molded body 20f, the upper front end portion 232e of the side retaining part 232 of the first retaining part 23 is inserted into the receiving opening 243. When the upper front end portion 232e is inserted into the receiving opening 243, the latch portion formed on the upper front end portion 232e engages with the upper surface of the semicircular portions 240, 241, and the second retaining part 24 is fixed to the first retaining part 23.

[0129] Mounting recesses 244 are formed between the two receiving openings 243 of the semicircular portion 240 and between the two receiving openings 243 of the semicircular portion 241. As will be described in detail later, after the battery assembly 21 is housed in the battery can 10, an adhesive for bonding and fixing the battery assembly 21 to the battery can 10 is applied to the mounting recesses 244.

[0130] <Positive Power Supply Board 30>

[0131] The positive electrode power supply plate 30 is made of a metal material such as nickel or aluminum, which electrically connects the positive electrode 201 of the battery molded body 20 to the electrode terminals of the can cap portion 50 (described later). The positive electrode power supply plate 30 has a tab connection portion 301 and a contact point connection portion 302. The tab connection portion 301 is formed as a plate having a long side along the axis X1. The tab connection portion 301 is joined to the positive electrode tab 206 mounted on the battery molded bodies 20a, 20b, 20c, 20d, and 20e, for example, by resistance welding.

[0132] The contact connection portion 302 is formed by bending the positive power supply plate 30 and is connected to the upper end of the tab connection portion 301. The contact connection portion 302 is housed in a housing portion 242 formed on the upper surface of the second holding portion 24 of the bracket 22. The lower surface of the contact connection portion 302 is joined to the positive electrode tab 206 of the battery molded body 20f housed in the housing portion 242 of the second holding portion 24, for example, by resistance welding.

[0133] Furthermore, the area near the upper end of the tab connection portion 301 of the positive power supply board 30 and the contact point connection portion 302 are not covered by the aforementioned heat shrink tubing 213. Therefore, near the upper end of the tab connection portion 301 of the positive power supply board 30, that is, near the location where it connects to the contact point connection portion 302, the positive electrode insulating seal 215 is installed, for example, by adhesive bonding.

[0134] <Negative Power Supply Board 40>

[0135] The negative electrode power supply plate 40 is a component that electrically connects the negative electrode 202 of the battery molded body 20 to the battery canister 10. Specifically, the negative electrode power supply plate 40 is a plate-shaped component having a long side along the axis X1. The negative electrode power supply plate 40 is made of a metal material such as nickel or copper. The negative electrode power supply plate 40 is joined to the negative electrode tabs 207 mounted on the negative electrodes 202 of the plurality of battery molded bodies 20, for example, by resistance welding.

[0136] The upper end of the negative electrode power supply plate 40 protrudes upwards beyond the upper end of the battery assembly 21. Two upper ends 401 and 402 are formed at the upper end of the negative electrode power supply plate 40. That is, the upper ends 401 and 402 are not covered by the heat shrink tubing 213. These two upper ends 401 and 402 are respectively joined to the inner peripheral wall of the side surface 102 of the battery canister 10 by welding or the like. Alternatively, the upper ends 401 and 402 may not be formed on the negative electrode power supply plate 40, and a single upper end may be formed instead.

[0137] <Can lid section 50>

[0138] The can lid 50 seals the opening of the battery can 10 by being mounted on the upper end of the battery can 10. After the can lid 50 is pressed into the upper end of the battery can 10, it is joined to the battery can 10, for example by laser welding, thereby sealing the opening of the battery can 10.

[0139] Figure 6 (A) is a perspective view of the upper side of the lid portion 50. Figure 6 (B) is a perspective view of the lower side of the can lid portion 50. The can lid portion 50 has a main body portion 51, an electrode terminal 52, an insulating portion 53, and an insulating sheet 54.

[0140] The main body 51 is, for example, made of metal and is a circular plate shape corresponding to the shape of the opening of the battery can 10. Figure 6 As shown in (B), an insulating sheet 54 is provided on the surface below the main body 51. The surface below the main body 51 refers to the surface opposite the bottom surface 101 of the battery can 10 when the can lid 50 is installed on the battery can 10. Furthermore, a C-surface 510 is formed on the outer periphery of the surface below the main body 51. The C-surface 510 functions as a guide when the can lid 50 is inserted into the opening of the battery can 10. An opening 511 is formed in the center of the can lid 50. The opening 511 is a through hole that extends through the main body 51 in the vertical direction.

[0141] The insulating part 53 is, for example, a non-conductive material such as glass calcination material or ceramic calcination material. The insulating part 53 is provided in the opening 511 of the main body part 51. An opening 531 is formed in the center of the insulating part 53. The opening 531 is a through hole that penetrates the insulating part 53 in the vertical direction.

[0142] Electrode terminal 52 is made of conductive material and is disposed in opening 531. Electrode terminal 52 is cylindrical and is formed by a first protrusion 521 and a second protrusion 522. The first protrusion 521 protrudes upward from the upper surface of the main body 51. The first protrusion 521 contacts electrical contact points such as those of the device for mounting the all-solid-state battery 1.

[0143] The second protrusion 522 protrudes downwards from the lower surface of the main body 51. That is, when the can cap 50 is installed on the battery can 10, the second protrusion 522 protrudes towards the bottom surface 101 of the battery can 10. The amount by which the first protrusion 521 protrudes relative to the main body 51 is greater than the amount by which the second protrusion 522 protrudes relative to the main body 51.

[0144] The second protrusion 522 protrudes downward by 0.1 mm relative to the insulating sheet 54 disposed on the lower surface of the main body 51. The insulating sheet 54 is, for example, made of resin material and has a thickness of about 0.1 mm. Therefore, the downward protrusion of the second protrusion 522 is about 0.2 mm. In other words, the protrusion of the second protrusion 522 is about 0.1 mm greater than the thickness of the insulating sheet 54.

[0145] The second protrusion 522 is electrically connected to the aforementioned positive power supply plate 30. Specifically, the second protrusion 522 is joined to the connection power supply plate 60 (described later) by means of, for example, resistance welding. Furthermore, when the positive power supply plate 30 is joined to the battery canister 10, the negative power supply plate 40 is electrically connected to the second protrusion 522.

[0146] Furthermore, the main body 51, electrode terminal 52, and insulating part 53 are integrally formed. Specifically, when the insulating part 53 is made of calcined glass material, the glass powder used as the material for the insulating part 53 is formed by stamping or the like, as described later. In this case, the insulating part 53 is formed into a cylindrical shape that can be inserted into the opening 511 of the main body 51 and can be used to mount the electrode terminal 52. Moreover, the main body 51, electrode terminal 52, and insulating part 53 are integrally formed by calcining the glass material of the insulating part 53 using an electric furnace or the like, through a glass sealing method.

[0147] <Connecting power supply board 60>

[0148] The power supply board 60 is a plate-shaped component made of conductive materials, such as stainless steel, aluminum, or nickel alloys. Alternatively, wires can also be used as the power supply board 60. Figure 2As shown, the plate-shaped component has multiple bending points (at Figure 2 The three bending points (within the middle) are alternately bent in opposite directions to form a folded shape. One end of the connecting power supply board 60 is joined to the second protrusion 522 of the electrode terminal 52 provided on the can cover portion 50 by means of, for example, resistance welding, laser welding, brazing, etc. The other end of the connecting power supply board 60 is joined to the contact point connection portion 302 of the positive power supply board 30 by means of, for example, resistance welding, laser welding, brazing, etc. Furthermore, when the positive power supply board 30 is joined to the battery can 10, the other end of the connecting power supply board 60 is joined to the negative power supply board 40.

[0149] Figure 7 (A) is a perspective view of the lower side of the can lid portion 50 in the state where the power supply board 60 is engaged with the second protrusion 522. Figure 7 As shown in (A), the width D1 of one end of the connecting power supply board 60 is greater than or equal to the diameter D2 of the second protrusion 522. Therefore, compared to the case where the width D1 is smaller than the diameter D2, the contact area between the connecting power supply board 60 and the second protrusion 522 can be increased. As a result, the resistance value at the junction of the connecting power supply board 60 and the electrode terminal 52 can be reduced.

[0150] Figure 7 (B) is Figure 2 An enlarged sectional view of region B, enclosed by a double-dotted line. (See example...) Figure 7 As shown in (B), the power supply board 60 is folded back at bending points P1, P2, and P3. On the power supply board 60, by folding back at bending points P1, P2, and P3, a first flat portion 601, a second flat portion 602, a third flat portion 603, a fourth flat portion 604, a first bent portion 605, a second bent portion 606, and a third bent portion 607 are formed.

[0151] The first flat portion 601, the second flat portion 602, the third flat portion 603, and the fourth flat portion 604 extend in a direction intersecting (orthogonal) the axis X1, and are housed inside the battery can 10 and the can cover portion 50 in a state of overlapping at intervals in the direction of the axis X1. The first curved portion 605 is the portion connecting the first flat portion 601 and the second flat portion 602, and is formed by bending the power supply plate 60 at the bending point P1. The second curved portion 606 is the portion connecting the second flat portion 602 and the third flat portion 603, and is formed by bending the power supply plate 60 at the bending point P2. The third curved portion 607 is the portion connecting the third flat portion 603 and the fourth flat portion 604, and is formed by bending the power supply plate 60 at the bending point P3.

[0152] A portion (e.g., one end) of the first flat portion 601 is connected to one end of the power supply board 60 and engages with the electrode terminal 52. A portion (e.g., one end) of the fourth flat portion 604 is connected to the other end of the power supply board 60 and engages with the positive electrode power supply board 30. As described above, the second protrusion 522 of the electrode terminal 52 protrudes downwards from the insulating sheet 54, thus suppressing short circuits caused by contact between the power supply board 60 and the main body 51. Furthermore, even when a high impact force is applied to the all-solid-state battery 1, the increase in contact resistance caused by momentary disconnection between the power supply board 60 and the electrode terminal 52, momentary disconnection between the positive electrode power supply board 30 (i.e., the battery molded body 20) and the power supply board 60, and friction of the contact surfaces can be suppressed, thereby suppressing the decrease in battery output voltage and the generation of oscillations.

[0153] <Manufacturing Method of All-Solid-State Battery 1>

[0154] Reference Figure 8 The flowchart shown illustrates the manufacturing method of the all-solid-state battery 1. In the first step shown in step S1, a battery molded body 20 is manufactured. In this case, for example, a laminate 211 having a positive electrode 201, a negative electrode 202, and a solid electrolyte layer 203 stacked together is formed by applying pressure using a stamping press. Furthermore, the positive electrode tab 206 is manufactured from a metal material such as aluminum, and the negative electrode tab 207 is manufactured from a metal material such as copper. The positive electrode tab 206 is bonded to the polarity sheet 201a of the positive electrode 201 provided on the laminate 211. The negative electrode tab 207 is bonded to the polarity sheet 202a of the negative electrode 202 provided on the laminate 211.

[0155] In the second step shown in step S2, the battery assembly 21 is manufactured. In this case, multiple battery molded bodies 20 manufactured by bonding positive electrode tabs 206 and negative electrode tabs 207 to the laminate 211 are stacked. Moreover, the battery assembly 21 is manufactured by mounting positive electrode power supply plate 30 and negative electrode power supply plate 40.

[0156] Furthermore, according to the production line, the process of bonding the positive electrode tab 206 and the negative electrode tab 207 to the laminate 211 in the first step of step S1 described above can also be performed in the second step of step S2. In this case, in the second step of step S2, after the battery forming body 20 is manufactured by bonding the positive electrode tab 206 and the negative electrode tab 207 to the laminate 211, the battery assembly 21 is manufactured. In addition, the positive electrode 201, the negative electrode 202, and the solid electrolyte layer 203 of the laminate 211 are stacked along the thickness direction, i.e., the first direction L1, and in the battery assembly 21, multiple battery forming bodies 20 are stacked along the first direction L1.

[0157] In the third step shown in step S3, the battery assembly 21 is housed inside the battery can 10. At this time, the battery assembly 21 is housed inside the battery can 10 in a first direction L1 along the axis X1 of the battery can 10, with multiple battery molded bodies 20 stacked on top of each other.

[0158] In the fourth step shown in step S4, the can lid portion 50 is manufactured. In this case, the can lid portion 50 is manufactured by integrally forming an insulating portion 53 (formed by compressing insulating material), a main body portion 51, and an electrode terminal 52. Furthermore, the fourth step is not limited to being performed after the third step; it can also be performed before the first step, before the second step, or before the third step.

[0159] In the fifth step shown in step S5, a can cover 50 is installed on the opening on one side of the battery can 10 along the axis X1, sealing the opening of the battery can 10. Thus, the all-solid-state battery 1 is manufactured. Each step will be described in detail below.

[0160] <First Process (Manufacturing of Battery Molded Body 20)>

[0161] In the first step, a laminate 211 is first formed using a positive electrode mixture, a negative electrode mixture, and a solid electrolyte. Then, a positive electrode tab 206 is attached to the positive electrode 201 of the laminate 211, and a negative electrode tab 207 is attached to the negative electrode 202, thereby manufacturing a battery mold 20.

[0162] <Forming of laminate 211>

[0163] Figure 9 (A) to Figure 9 (C) is a schematic diagram illustrating the forming process of the laminate 211. The laminate 211 is formed by pressurizing and compressing a solid (powder) material disposed in a mold using a stamping press or the like. Specifically, firstly, the aforementioned solid electrolyte is disposed in the lower die 81 within a cylindrical compression stamping die 80. Figure 9 As shown in (A), a pressing mold 82 is placed on the solid electrolyte, and the solid electrolyte layer 203 is compressed along the first compression direction indicated by arrow A3 in the figure via a stamping press or the like. This generates a temporary forming layer 203b of the solid electrolyte layer 203.

[0164] like Figure 9 As shown in (B), a positive electrode compound constituting the positive electrode 201 is disposed on the temporary forming layer 203b of the solid electrolyte layer 203, and a polar sheet 201a is disposed on the positive electrode compound. Furthermore, the polar sheet 201a, the positive electrode compound, and the temporary forming layer 203b are compressed by a press or the like via an upper die 82 along the first compression direction A3. Thus, the temporary forming layer 201b of the positive electrode 201 and the polar sheet 201a are formed on the upper part of the temporary forming layer 203b of the solid electrolyte layer 203.

[0165] Then, as Figure 9 As shown in (C), the temporary forming layer 203b of the solid electrolyte layer 203, the temporary forming layer 201b of the positive electrode 201, and the polar plate 201a are reversed vertically. In this case, the temporary forming layer 203b of the solid electrolyte layer 203, the temporary forming layer 201b of the positive electrode 201, and the polar plate 201a can also be temporarily removed from the compression stamping die 80, reversed vertically, and then repositioned in the compression stamping die 80.

[0166] Then, the material is temporarily removed from the compression stamping die 80 and reversed. A negative electrode mixture 202b, constituting the negative electrode 202, is disposed on the temporary forming layer 203b of the solid electrolyte layer 203, specifically on the surface of the temporary forming layer 203b of the solid electrolyte layer 203 that is not opposite to the temporary forming layer 201b of the positive electrode 201. A polar sheet 202a is disposed on the negative electrode mixture 202b. The polar sheet 202a, negative electrode mixture 202b, temporary forming layer 203b of the solid electrolyte layer 203, temporary forming layer 201b of the positive electrode 201, and polar sheet 201a are compressed by a stamping press or the like via a lowering die 81 along the first compression direction A3. Thus, the negative electrode mixture 202b, the temporary forming layer 203b of the solid electrolyte layer 203, and the temporary forming layer 201b of the positive electrode 201 are compressed. As a result, a laminate 211 is formed having a 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.

[0167] By being compressed along the first compression direction A3, the laminate 211 is shaped into a shape having a thickness in a predetermined direction along the first compression direction A3. Furthermore, in the laminate 211, a positive electrode 201, a solid electrolyte layer 203, and a negative electrode 202 are laminated along a predetermined direction. In other words, the lamination direction of the positive electrode 201, the solid electrolyte layer 203, and the negative electrode 202, the first direction L1, and the first compression direction A3 are aligned (consistent).

[0168] Figure 10 (A) is a perspective view of the formed laminate 211. The laminate 211 is formed into a cylindrical shape by compression within a cylindrical compression die 80. Alternatively, if the compression die 80 has a square shape, the laminate 211, composed of the positive electrode 201, the solid electrolyte layer 203, and the negative electrode 202, becomes prismatic. As described above, the laminate 211 has a thickness along the first direction L1.

[0169] Figure 10(B) is a top view schematically showing the direction in which the positive electrode 201, the solid electrolyte layer 203, and the negative electrode 202 extend under compression as the laminate 211 is formed. Specifically, Figure 10 (B) Schematic representation of a stacked body 211 in a plane orthogonal to the first direction L1.

[0170] During molding, because it is compressed in the first compression direction A3, the laminate 211 extends radially outward from its center in the radial direction A4. Therefore, when the molded laminate 211 is placed in a high-temperature environment, the laminate 211 has strong resistance to high-temperature expansion in the A4 direction.

[0171] Figure 10 (C) is a top view of the laminate 211 schematically showing the direction of the force remaining in the laminate 211 after compression. Specifically, Figure 10 (C) Schematic representation of a stacked body 211 in a plane orthogonal to the first direction L1.

[0172] In the formed laminate 211, due to the strain applied to the powder material during compression, a force remains along the radial direction A5 from the outer periphery toward the center of the laminate 211. Therefore, when the formed laminate 211 is placed in a low-temperature environment, the laminate 211 has strong resistance to low-temperature shrinkage in the A5 direction.

[0173] That is, the laminate 211 exhibits strong resistance to high-temperature expansion and low-temperature contraction in the direction intersecting with the first direction L1. In other words, the laminate 211 is less prone to cracking, collapse, or bending in the direction intersecting with the first direction L1 due to temperature changes. Conversely, in the thickness direction of the laminate 211, i.e., the first direction L1, its resistance to high-temperature expansion and low-temperature contraction is weaker compared to the direction intersecting with the first direction L1. Therefore, if the laminate 211 is subjected to a force along the first direction L1 in a high-temperature environment (e.g., around 60℃ to 125℃) or a low-temperature environment (e.g., around -20℃ to -50℃), it is more prone to cracking, collapse, or bending compared to the direction intersecting with the first direction L1.

[0174] <Manufacturing of Battery Molded Body 20>

[0175] A battery molded body 20 is manufactured by attaching a heat-shrinkable tube 212, a positive electrode tab 206, and a negative electrode tab 207 to a laminate 211 as described above. Since the battery molded body 20 is manufactured by attaching the heat-shrinkable tube 212, the positive electrode tab 206, and the negative electrode tab 207 to the laminate 211, it can also be said that the battery molded body 20 is manufactured by compression in the first compression direction A3 described above.

[0176] Figure 11 (A) to Figure 11 (C) is a diagram showing the manufacturing process of the battery molded body 20. Figure 10 (A) shows the insertion of a cylindrical laminate 211. Figure 11 (A) shows a cylindrical heat shrink tube 212. If the heat shrink tube 212 is heated in this state, the heat shrink tube 212 will shrink. Thus, as Figure 11 As shown in (B), the sides of the laminate 211 as well as the periphery of the upper and lower surfaces are covered by heat shrink tubes 212.

[0177] By installing 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, it can insulate the battery molded body 20 from the metal battery can 10 when the battery molded body 20 is housed in the battery can 10.

[0178] like Figure 11 As shown in (C), in the laminate 211 on which the heat-shrinkable tube 212 is mounted, the positive electrode tab 206 and the negative electrode tab 207 are joined, for example, by resistance welding. Specifically, the positive electrode tab 206 is joined to the polar sheet 201a on one side of the laminate 211, i.e., the side where the positive electrode 201 is formed. Furthermore, the negative electrode tab 207 is joined to the polar sheet 202a on the other side of the laminate 211, i.e., the side where the negative electrode 202 is formed. Thus, manufacturing... Figure 4 (A) Figure 4 (B) shows the battery molded body 20.

[0179] in addition, Figure 11 (C) indicates manufacturing Figure 4 (A) shows the battery molded bodies 20a, 20b, 20c, 20d, and 20e.

[0180] Alternatively, the heat shrink tube 212 can also be installed after the positive electrode tab 206 and the negative electrode tab 207 are respectively joined with the polar plates 201a and 202a.

[0181] <Second Process (Manufacturing of Battery Module 21)>

[0182] Next, refer to Figure 12 (A) to Figure 16 The perspective view of the battery assembly 21 during manufacturing process illustrates the details of the second process. In the second process, multiple battery molded bodies 20 manufactured in the first process are stacked along the first direction L1 within a support 22. Furthermore, a positive power supply plate 30 is attached to the positive electrode tab 206 of each of the multiple battery molded bodies 20 held in the support 22, and a negative power supply plate 40 is attached to the negative electrode tab 207 of each of them.

[0183] <Layering of battery molding body 20>

[0184] First, the first retaining portion 23 of the bracket 22 is deformed into a shape capable of accommodating the battery molded body 20. Specifically... Figure 5 (A) The first holding part 23, during the forming process, is bent in the direction A1 with the bent parts 232b of the four side holding parts 232 as fulcrums, thereby as shown in the figure. Figure 3 The shape shown is adapted to accommodate the battery molded body 20.

[0185] On the bottom holding portion 231 of the first holding portion 23, a plurality of battery molded bodies 20 are stacked in the stacking direction along the first direction L1. Furthermore, as described above, an insulating plate 210 is disposed between the plurality of battery molded bodies 20. Additionally, when a sheet 233 is disposed, the sheet 233 is provided between the bottommost battery molded body 20a and the bottom holding portion 231.

[0186] Figure 12 (A) Figure 12 (B) is a perspective view of the battery assembly 21 with multiple battery molded bodies 20 stacked on the first holding part 23. Figure 12 As shown in (A), the battery molded bodies 20 are stacked such that the negative electrode tabs 207 of each battery molded body 20 are arranged in a row along the stacking direction (first direction L1). Furthermore, although in Figure 12 (A) does not indicate this, but the positive electrode tab 206 is also arranged in a column along the stacking direction.

[0187] exist Figure 12 In the state shown in (A), the curved portion 232a above the side retaining portion 232 bends towards direction A2 with the lower end portion 232c as the fulcrum. Thus, as... Figure 12 As shown in the perspective view of (B), the contact surface 232d of the curved portion 232a contacts the upper surface of the uppermost battery molded body 20f. Furthermore, the upper front end portion 232e formed at the upper end of the contact surface 232d extends along the first direction L1.

[0188] When multiple battery molded bodies 20 are stacked in the first holding part 23, the second holding part 24 is installed on the upper part of the uppermost battery molded body 20f. Figure 13(A) is a perspective view of the battery assembly 21 with the second retaining part 24 installed. (As shown) Figure 13 As shown in (A), the upper front portion 232e of the first retaining portion 23 is inserted into the receiving opening 243 of the second retaining portion 24. As described above, the second retaining portion 24 is fixed to the first retaining portion 23 by engaging the latch portion formed on the upper front portion 232e with the upper surface of the second retaining portion 24. As a result, the battery molded body 20 is held from above by the second retaining portion 24.

[0189] like Figure 13 As shown in (A), the positive electrode tab 206 of the uppermost battery forming body 20f protrudes upwards from the second holding portion 24. This positive electrode tab 206 is bent towards direction A4. Thus, as... Figure 13 As shown in (B), the connecting portion 206b of the positive electrode tab 206 of the battery molded body 20f is housed in the recess formed on the upper surface of the second holding portion 24, namely the housing portion 242.

[0190] Then, the positive power supply board 30 and the negative power supply board 40 are connected. Figure 14 (A) is a perspective view of the battery assembly 21 with the positive electrode power supply plate 30 attached. In this case, the tab connection portion 301 of the positive electrode power supply plate 30 is joined to the positive electrode tabs 206 mounted on the battery molded bodies 20a, 20b, 20c, 20d, and 20e by resistance welding or the like. In addition, the lower surface of the contact point connection portion 302 of the positive electrode power supply plate 30 is joined to the upper surface of the connection portion 206b of the positive electrode tab 206 provided on the battery molded body 20f by resistance welding or the like.

[0191] Figure 14 (B) is a perspective view of the battery assembly 21 showing the state where the positive power supply plate 30 is joined and the negative power supply plate 40 is joined. As shown, the negative power supply plate 40 is joined to the negative electrode tabs 207 respectively mounted on the battery molded bodies 20a, 20b, 20c, 20d, 20e, and 20f by resistance welding or the like. Thus, the battery assembly 21 is manufactured. Furthermore, for ease of explanation, the negative power supply plate 40 is joined after the positive power supply plate 30 is joined, but the positive power supply plate 30 can also be joined after the negative power supply plate 40 is joined.

[0192] The sides of the battery assembly 21 are covered by the aforementioned non-conductive heat-shrink tubing 213. Specifically, as... Figure 15 As shown in the perspective view, the battery assembly 21 is inserted into the cylindrical heat-shrink tube 213. If the heat-shrink tube 213 is heated in this state, it shrinks. Thus, as... Figure 16 As shown in the perspective view, the side of the battery assembly 21 is covered by heat shrink tubing 213.

[0193] That is, multiple battery molded bodies 20, brackets 22, positive electrode power supply plates 30, and negative electrode power supply plates 40 are covered by heat shrink tubing 213. However, the second holding portion 24 of the uppermost bracket 22 of the battery assembly 21 is not covered by heat shrink tubing 213. That is, the vicinity of the upper end of the tab connection portion 301 of the positive electrode power supply plate 30 and the vicinity of the contact point connection portion 302, and the vicinity of the upper ends 401 and 402 of the negative electrode power supply plate 40 are not covered by heat shrink tubing 213.

[0194] The sides of the battery assembly 21 are covered by heat-shrink tubing 213, which secures the multiple battery molded bodies 20 constituting the battery assembly 21, thus preventing the battery molded bodies 20 from separating or detaching. Furthermore, it prevents the positive power supply plate 30, which is connected to the positive electrode tab 206, or the negative power supply plate 40, which is connected to the negative electrode tab 207, from detaching. Additionally, when the battery assembly 21 is housed in the battery canister 10 using the heat-shrink tubing 213, direct contact between the positive power supply plate 30 and the battery canister 10 is prevented. As a result, short circuits caused by contact between the positive power supply plate 30 and the battery canister 10 are prevented.

[0195] Additionally, near the upper end of the tab connection portion 301 of the positive power supply board 30, that is, near the location where it connects to the contact point connection portion 302, such as Figure 16 As shown, the positive electrode insulating seal 215 is installed, for example, by adhesive bonding. By installing the positive electrode insulating seal 215, short circuits that may occur due to contact between the positive electrode power supply plate 30 of the battery assembly 21 housed in the battery can 10 and the battery can 10 can be suppressed. Furthermore, if the upper end of the tab connection portion 301 of the positive electrode power supply plate 30 can be covered by the heat shrink tube 213, the positive electrode insulating seal 215 may not need to be installed.

[0196] <Third step (battery assembly 21 is stored inside battery canister 10)>

[0197] Figure 17 This is a perspective view illustrating the process of storing the battery assembly 21 into the battery container 10. Figure 18 This is a 3D view of the battery can 10 containing the battery assembly 21. (See diagram below.) Figure 17 As shown, firstly, a buffer sheet 105 is housed in the battery can 10. Then, the battery assembly 21, equipped with a heat-shrink tube 213 and a positive electrode insulating seal 215, is moved downwards along axis X1 from above the battery can 10 and inserted into the battery can 10. That is, the battery assembly 21 is positioned on the bottom surface 101 of the battery can 10 through the buffer sheet 105.

[0198] Furthermore, in the battery assembly 21 inserted into the battery canister 10, the direction in which the plurality of battery molded bodies 20 are stacked, i.e., the first direction L1, is along the axis X1. In other words, the plurality of battery molded bodies 20 are stacked along the axis X1 within the battery canister 10. Alternatively, it can be said that the first compression direction A3 of the battery molded bodies 20 (stacked bodies 211) is along the axis X1.

[0199] A recess 104 is formed by stamping a recess 104 on the side 102 of the battery can 10, and a protrusion protruding toward the axis X1 is formed on the inner peripheral wall of the battery can 10. The side of the battery assembly 21 housed inside the battery can 10 contacts the aforementioned protrusion. This suppresses vibration of the battery assembly 21 inside the battery can 10.

[0200] Figure 18 The upper ends 401 and 402 of the negative power supply board 40 shown are not covered by the heat shrink tubing 213. The upper ends 401 and 402 of the negative power supply board 40 are joined to the battery canister 10 by welding or the like. Thus, the negative electrode 202 is electrically connected to the battery canister 10 through the negative power supply board 40.

[0201] Subsequently, the battery assembly 21 is fixed to the inner peripheral wall of the side surface 102 of the battery canister 10 with an adhesive. Specifically, the adhesive is applied to the mounting recess 244 formed on the second retaining portion 24 of the bracket 22 which is not covered by the heat shrink tube 213 and to the inner peripheral wall of the side surface 102 of the battery canister 10. As the adhesive, UV adhesives, epoxy resin adhesives, silicone adhesives, etc., can be used.

[0202] Furthermore, the structure is not limited to the negative power supply plate 40 being connected to the battery canister 10. The positive power supply plate 30 can also be connected to the battery canister 10. In this case, the negative power supply plate 40 can be configured to contact the electrode terminal 52 of the canister cap portion 50, which will be described later.

[0203] <Fourth Process (Manufacturing of the Can Lid Part 50)>

[0204] As described above, the can lid portion 50 is integrally formed from a main body portion 51 made of a conductive material such as metal, an electrode terminal 52, and an insulating portion 53 made of an insulating material. When forming the can lid portion 50, firstly, powder of the material used for the insulating portion 53 is formed by stamping or the like. Specifically, it is formed into a cylindrical shape having an outer diameter capable of inserting an opening 511 into the main body portion 51 and an inner diameter capable of inserting the electrode terminal 52.

[0205] Figure 19 (A) is a schematic diagram illustrating the forming process of the insulating part 53. The material (insulating material) 53a of the insulating part 53 is housed in the first compression stamping die 90. The first compression stamping die 90 is a bottomed cylindrical shape with a bottom surface 901. Furthermore, Figure 19(A) shows that axis X2 passes through the center of bottom surface 901 and is orthogonal to bottom surface 901.

[0206] The inner diameter of the first compression stamping die 90 is approximately equal to the diameter of the opening 511 of the main body 51. A portion having an electrode terminal 52 is formed at the center of the bottom surface 901. Figure 2 A cylindrical protrusion 902 with a diameter approximately equal to that of the first compression die 90 and extending along axis X2. Insulating material 53a is housed in the space 904 between the bottom surface 901, the inner peripheral wall surface 903, and the cylindrical protrusion 902 of the first compression die 90.

[0207] The insulating material 53a housed in the first compression die 90 is compressed from above by the second compression die 91 in a downward second compression direction A6 along the axis X2. Furthermore, the second compression die 91 has a diameter approximately equal to the inner diameter of the first compression die 90, and a recess 910 with a diameter approximately equal to the diameter of the cylindrical protrusion 902 is formed at its center.

[0208] Figure 19 (B) is a perspective view of the insulating portion 53 formed by compression under pressure. By being compressed within a cylindrical first compression die 90, the insulating portion 53 is formed into a shape having thickness along the second compression direction A6 in the second direction L2. Furthermore, since a cylindrical protrusion 902 is formed in the first compression die 90, the insulating portion 53 is formed into a cylindrical shape with an opening 511. Additionally, if the first compression die 90 has a square tube shape, the insulating portion 53 becomes a square tube shape.

[0209] Figure 19 (C) is a top view schematically showing the direction in which the insulating portion 53 extends when formed by compression. Specifically, Figure 19 (C) Schematic representation of the insulating portion 53 in a plane orthogonal to the second direction L2. During molding, the insulating material 53a is compressed in the second compression direction A6 (i.e., along the second direction L2). Therefore, the insulating portion 53 extends radially outward from the interior of the insulating portion 53 in the A7 direction and radially outward from the interior of the insulating portion 53 in the A8 direction. Therefore, when the molded insulating portion 53 is placed in a high-temperature environment, the insulating portion 53 has strong resistance to high-temperature expansion in the A7 and A8 directions.

[0210] Figure 19(D) is a top view of the insulating portion 53 schematically showing the direction of the forces remaining in the molded insulating portion 53. In the molded insulating portion 53, due to the strain applied to the powder material during compression, forces remain in the A9 direction radially inward from the outer periphery of the insulating portion 53 and in the A10 direction radially inward from the inner periphery. Therefore, when the molded insulating portion 53 is placed in a low-temperature environment, the insulating portion 53 has strong resistance to low-temperature shrinkage in the A9 and A10 directions.

[0211] That is, the insulating portion 53 exhibits strong resistance to high-temperature expansion and low-temperature contraction in the direction intersecting with the second direction L2. In other words, the insulating portion 53 is less prone to cracking, deformation, or bending in the direction intersecting with the second direction L2 due to temperature changes. Conversely, in the thickness direction of the insulating portion 53, i.e., the second direction L2, its resistance to high-temperature expansion and low-temperature contraction is weaker compared to the direction intersecting with the second direction L2. Therefore, if the insulating portion 53 is subjected to a force along the second direction L2 in a high-temperature environment, such as exceeding 60°C (e.g., an environment of approximately 60°C to 125°C), or a low-temperature environment below -20°C (e.g., an environment of approximately -20°C to -50°C), it is more prone to cracking, deformation, or bending compared to the direction intersecting with the second direction L2.

[0212] The insulating portion 53, shaped as described above, is inserted into the opening 511 of the main body portion 51. The electrode terminal 52 is inserted into the opening 531 of the insulating portion 53. Then, the insulating material 53a of the insulating portion 53 is calcined, as... Figure 6 (A) Figure 6 As shown in (B), the main body 51, electrode terminal 52 and insulating part 53 are integrally formed to manufacture the can lid part 50.

[0213] The aforementioned insulating sheet 54 is mounted on the surface below the main body 51 of the can lid portion 50. Furthermore, the first flat portion 601 of the power supply board 60 is joined to the second protrusion 522 of the electrode terminal 52 via resistance welding or the like. As a result, as... Figure 7 As shown in (B), a can lid portion 50 is formed on which a power supply board 60 is installed.

[0214] <Fifth step (installing the can lid 50 onto the battery can 10)>

[0215] In the fifth process, the battery can 10, which houses the battery assembly 21 in the third process, is installed onto the can lid 50 manufactured in the fourth process.

[0216] Figure 20 (A) Figure 20 (B) is a perspective view illustrating the installation process of the can lid 50 onto the battery can 10. First, as... Figure 20As shown in (A), the connecting power supply board 60 installed on the can lid 50 and the positive power supply board 30 housed in the battery can 10 are joined, for example, by resistance welding. Specifically, the first flat portion 601 of the connecting power supply board 60 is joined to the contact point connection portion 302 of the positive power supply board 30 housed in the housing portion 242 of the second holding portion 24 of the bracket 22.

[0217] After that, as Figure 20 As shown in (B), with the lower surface of the can lid 50 facing the upper surface of the second retaining portion 24, the can lid 50 moves downward along the axis X1 and is pressed into the battery can 10. Then, the periphery of the can lid 50 and the upper end of the battery can 10 are joined along the seam, for example by laser welding. Thus, the battery can 10 is sealed by the can lid 50. As a result, a battery can with… Figure 1 The appearance of the all-solid-state battery 1 is shown.

[0218] At this time, the can cover 50 is installed on the battery can 10 with the thickness direction of the insulating portion 53, i.e., the second direction L2, aligned with the axis X1 of the battery can 10. As described above, the battery assembly 21 is housed in the battery can 10 with the thickness direction of the battery molded body 20, i.e., the first direction L1, aligned with the axis X1 of the battery can 10. Therefore, when the can cover 50 is installed on the battery can 10, the battery molded body 20 and the insulating portion 53 are arranged aligned with the axis X1 with the first direction L1 and the second direction L2 aligned (aligned state). That is, the battery molded body 20 and the insulating portion 53 are arranged in a manner aligned with the axis X1 with a direction that has low resistance to temperature changes. Alternatively, it can be said that the first compression direction A3 of the battery molded body 20 and the second compression direction A6 of the insulating portion 53 are along the axis X1.

[0219] Furthermore, the sealing process is performed under vacuum conditions using the can lid 50. In this case, the pressure difference can be 1 atmosphere (0.1 MPa). By performing the sealing under vacuum conditions, the interior of the battery can 10 becomes negative pressure under atmospheric pressure. Therefore, the bottom surface 101 of the battery can 10 is recessed inward. By measuring this recess using, for example, a laser displacement gauge, it is possible to check whether the battery can 10 is properly sealed.

[0220] In addition, such as Figure 21 As shown in the perspective view, a cushioning member 99 can also be installed on the upper surface of the can lid 50 of the all-solid-state battery 1. In this case, the cushioning member 99 can be installed on the can lid 50 using a weakly adhesive double-sided tape or the like.

[0221] The buffer member 99 is, for example, a soft elastomer with insulating properties such as silicone rubber. The buffer member 99 is a cylindrical shape having an outer diameter approximately equal to the diameter of the can lid portion 50 and an inner diameter into which the first protrusion 521 of the electrode terminal 52 can be inserted. In addition, the length of the buffer member 99 along the axis X1 is greater than the length of the first protrusion 521 protruding from the can lid portion 50.

[0222] Therefore, in the event of a fall of the all-solid-state battery 1, the electrode terminal 52 may collide with the floor or other surfaces, preventing damage to the electrode terminal 52 due to impact. Furthermore, it prevents a short circuit caused by contact between the electrode terminal 52 and the battery canister 10 with a conductive material such as metal.

[0223] According to the above-described embodiments, at least one of the following effects can be obtained.

[0224] (1) The all-solid-state battery 1 comprises: a bottomed cylindrical battery can 10 that houses a battery assembly 21, the battery assembly 21 having: a battery molded body 20 having a positive electrode 201, a negative electrode 202 and a solid electrolyte layer 203 between the positive electrode 201 and the negative electrode 202; a positive electrode power supply plate 30; a negative electrode power supply plate 40; and a can lid 50 that seals the opening at one end of the battery can 10. The can lid 50 has conductive electrode terminals 52 and an insulating portion 53 disposed around the electrode terminals 52. The battery molded body 20 and the insulating portion 53 are arranged along the axis X1 of the battery can 10. The first compression direction A3 of the battery molded body 20 and the second compression direction A6 of the insulating portion 53 are along the axis X1. Alternatively, an elastic member may be disposed between the battery assembly 21 and the inner surface of the battery can 10.

[0225] In high-temperature and low-temperature environments, if the battery molded body 20 and the insulating portion 53 are not arranged in the directions with lower resistance to external forces (first direction L1 and second direction L2), it is necessary to consider the impacts from the first direction L1 and the second direction L2 respectively. That is, it is necessary to provide countermeasures such as buffering components inside the all-solid-state battery 1 and on the device side where the all-solid-state battery 1 is installed to counteract impacts from multiple directions. In contrast, in this embodiment, since the battery molded body 20 and the insulating portion 53 are arranged in a state where the first direction L1 and the second direction L2 are aligned, it is only necessary to take countermeasures against impacts from a single direction.

[0226] Therefore, without needing to consider impacts from multiple directions, the design and manufacture of the impact-resistant structure of the all-solid-state battery 1 and the impact-resistant structure of the device mounting the all-solid-state battery 1 become easier. As a result, the all-solid-state battery 1 of this embodiment can be used in high-temperature and low-temperature environments, that is, in a wider temperature range than that of conventional batteries. In other words, it is possible to provide an all-solid-state battery 1 that can be used in a wider temperature range than conventional batteries.

[0227] (2) Multiple battery molded bodies 20 are stacked within the battery canister 10 along axis X1. Therefore, by taking countermeasures against impacts in a single direction, such as providing an insulating plate 210 made of a soft elastomer along axis X1, damage to the multiple battery molded bodies 20 in the battery assembly 21 can be suppressed. As a result, an all-solid-state battery 1 that can be used in both high-temperature and low-temperature environments, i.e., in environments with a wide temperature range, can be provided.

[0228] (3) The connecting power supply plate 60, which connects the positive power supply plate 30 and the electrode terminal 52, has a folded-back shape with more than one bending point. Therefore, under high impact conditions on the all-solid-state battery 1, the instantaneous disconnection between the connecting power supply plate 60 and the electrode terminal 52, the instantaneous disconnection between the positive power supply plate 30 (i.e., the battery molding body 20) and the connecting power supply plate 60, and the increase in contact resistance caused by contact surface friction can be suppressed. As a result, the decrease in the battery's output voltage and the generation of oscillations are suppressed.

[0229] (4) The electrode terminal 52 has a second protrusion 522 that protrudes further into the bottom surface 101 of the battery can 10 than the insulating portion 53. One end of the power supply board 60 is connected to the second protrusion 522, and the other end is connected to the positive power supply board 30. Thus, the electrode terminal 52 can be electrically connected to the positive electrode 201 via the positive power supply board 30.

[0230] (5) The width D1 of one end of the connecting power supply board 60 is greater than or equal to the diameter D2 of the second protrusion 522. Therefore, compared to the case where the width D1 is smaller than the diameter D2, the contact area between the connecting power supply board 60 and the second protrusion 522 can be increased. That is, the resistance at the junction of the connecting power supply board 60 and the electrode terminal 52 can be reduced. As a result, more power can be supplied from the charged all-solid-state battery 1. For example, when the all-solid-state battery 1 is installed in a mobile device such as a mobile phone, the standby time of the mobile device can be extended.

[0231] (6) An insulating sheet 54 is provided on the surface of the can lid 50 opposite to the bottom surface 101 of the battery can 10, and the protrusion of the second protrusion 522 is greater than the thickness of the insulating sheet 54. This prevents the power supply board 60 from contacting the main body 51 of the can lid 50 and short-circuiting.

[0232] (7) The protrusion of the second protrusion 522 is 0.2 mm. By suppressing the protrusion of the second protrusion 522 along the axis X1 to a small extent, space for housing the battery molded body 20 can be ensured within the battery canister 10. That is, the size of the battery molded body 20 housed within the battery canister 10 can be increased while suppressing the enlargement of the all-solid-state battery 1, thereby increasing the capacity of the all-solid-state battery 1. Alternatively, if the protrusion of the second protrusion 522 along the axis X1 is 0.2 mm or less, space for housing the battery molded body 20 can be ensured within the battery canister 10.

[0233] (8) Multiple battery molded bodies 20 are arranged with insulating plates 210 in between. Thus, the multiple battery molded bodies 20 are arranged in an insulated state, and the insulating plates 210, which are soft elastomers, buffer impacts on the battery molded bodies 20 stacked along the X1 axis in the X1 direction. That is, impacts from directions with low resistance to temperature changes are mitigated, thus suppressing damage to the battery molded bodies 20 even under conditions of large temperature variations. As a result, the all-solid-state battery 1 can be used in environments with a wide range of temperature variations. Furthermore, the insulating plates 210, which are soft elastomers, suppress the application of load stress to the joints of the positive electrode tabs 206 and negative electrode tabs 207 of the battery molded bodies 20 stacked along the X1 axis.

[0234] The embodiments of this disclosure have been described in detail above, but are not limited to the aforementioned embodiments. Various modifications can be made without departing from the spirit of the invention. In addition to the essential constituent elements, each embodiment can include, delete, or replace constituent elements. Unless otherwise specified, each constituent element can be a single element or multiple elements.

[0235] The all-solid-state battery 1 is not limited to having multiple battery molded bodies 20, but may also have a single battery molded body 20.

[0236] The can lid portion 50 is not limited to having a main body portion 51 made of conductive material. For example, the can lid portion 50 may also be integrally formed from an electrode terminal 52 and an insulating portion 53. In this case, the outer diameter of the insulating portion 53 is approximately equal to the inner diameter of the upper end of the battery can 10. Furthermore, the can lid portion 50 can be mounted to the battery can 10 by fixing the outer periphery of the insulating portion 53 to the upper end of the battery can 10 using riveting or the like.

[0237] In the technology involved in this embodiment, the battery molded bodies and insulating portions of the can lid, which are multiple batteries, are arranged in a manner that aligns them in a direction with low resistance to temperature changes, thereby enabling the use of all-solid-state batteries even in environments with a wide range of temperature variations. According to the present invention providing such technology, it can contribute to “building the foundation for industrial and technological innovation” of the United Nations’ Sustainable Development Goals (SDGs).

[0238] Symbol Explanation

[0239] 1: All-solid-state batteries

[0240] 10: Battery can

[0241] 20, 20a, 20b, 20c, 20d, 20e, 20f: Battery molded bodies

[0242] 21: Battery Components

[0243] 22: Bracket

[0244] 23: First Maintenance Section

[0245] 24: Second Maintenance Section

[0246] 30: Positive power supply board

[0247] 40: Negative power supply board

[0248] 50: Can lid section

[0249] 51: Main body

[0250] 52: Electrode terminal

[0251] 53: Insulation section

[0252] 53a: Insulating materials

[0253] 54: Insulating sheet

[0254] 60: Connect the power supply board

[0255] 101: Bottom

[0256] 201: Positive electrode

[0257] 202: Negative electrode

[0258] 203: Solid electrolyte layer

[0259] 210, 210a, 210b, 210c, 210d, 210e: Insulating boards

[0260] 211: Layered body

[0261] 521: First protrusion

[0262] 522: Second protrusion

[0263] A3: First compression direction

[0264] A6: Second compression direction

[0265] D1: Width

[0266] D2: Diameter

[0267] X1: Axis

Claims

1. An all-solid battery, characterized by, Possessing: a bottomed cylindrical battery can which houses a battery assembly having: a battery shaped 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 shaped body; and a negative electrode power supply plate connected to the negative electrode of the battery shaped body; and a can cover portion which seals an opening of one end of the battery can, the can cover portion has an electrically conductive electrode terminal electrically connected to the positive electrode power supply plate or the negative electrode power supply plate, and an insulating portion provided around the electrode terminal, the battery shaped body and the insulating portion are arranged along an axial direction intersecting a bottom surface of the battery can, a compression direction of the battery shaped body and the insulating portion is a direction toward the bottom surface of the battery can along the axial direction.

2. The all-solid-state battery according to claim 1, wherein a plurality of the battery shaped bodies are respectively stacked in the battery can along the axial direction.

3. The all-solid-state battery according to claim 2, wherein a connection power supply plate which connects the positive electrode power supply plate or the negative electrode power supply plate and the electrode terminal is provided, the connection power supply plate has a folded-back shape which is folded back at one or more bending points.

4. The all-solid-state battery according to claim 3, wherein the electrode terminal has a protruding portion which protrudes more toward the bottom surface of the battery can than the insulating portion along the axial direction intersecting the bottom surface of the battery can, one end of the connection power supply plate is connected to the protruding portion, and the other end is connected to the positive electrode power supply plate or the negative electrode power supply plate.

5. The all-solid-state battery according to claim 4, wherein a width of the one end of the connection power supply plate is equal to or greater than a diameter of the protruding portion.

6. The all-solid-state battery according to claim 5, wherein an insulating sheet is provided on a surface of a side of the can cover portion which opposes the bottom surface of the battery can, a protruding amount of the protruding portion is greater than a thickness of the insulating sheet.

7. The all-solid-state battery according to claim 6, wherein the protruding amount of the protruding portion is greater than the thickness of the insulating sheet and is equal to or less than 0.2 mm.

8. The all-solid-state battery according to claim 1, wherein the battery shaped 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 2, wherein the plurality of battery shaped bodies are respectively arranged with an insulating plate interposed therebetween.

10. A method for manufacturing an all-solid battery, characterized by Possessing: a first step in which a positive electrode mixture, a negative electrode mixture, and a solid electrolyte are compressed along a first compression direction, a laminate in which a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive and negative electrodes are stacked is shaped, a positive electrode tab connected to the positive electrode and a negative electrode tab connected to the negative electrode are manufactured, the positive electrode tab is mounted on the positive electrode of the laminate, and the negative electrode tab is mounted on the negative electrode of the laminate, and a battery shaped body is manufactured; In the second step, a positive power supply plate and a negative power supply plate are installed on the positive electrode tab and the negative electrode tab installed on the battery molding body to manufacture a battery assembly. In the third step, the battery assembly is housed by means of the first compression direction along an axial direction that intersects the bottom surface of the bottom cylindrical battery can. In the fourth step, the insulating material is compressed in the second compression direction to form an insulating part, and a can lid part having the insulating part and electrode terminals as conductive material is integrally formed. as well as In the fifth step, the can cover is installed at one end of the battery can with the second compression direction along the axial direction.

11. The method for manufacturing an all-solid-state battery according to claim 10, characterized in that, In the second step, multiple battery molding bodies are stacked along the axial direction, and a positive power supply plate and a negative power supply plate are installed on the positive electrode tab and the negative electrode tab of each of the multiple battery molding bodies.

Images