Method for manufacturing all-solid-state battery, and all-solid-state battery

Abstract

To provide a method for manufacturing an all-solid-state battery, and an all-solid-state battery in which energy density can be improved.SOLUTION: A method for manufacturing an all-solid-state battery 1 includes: a cell forming step of forming a cell 2 having a positive electrode layer 21 formed of powder containing a positive electrode active material, a negative electrode layer 22 formed of powder containing a negative electrode active material, a solid electrolyte layer 23 which is arranged between the positive electrode layer 21 and the negative electrode layer 22 and formed of powder of solid electrolyte on a first substrate F1 by a dry process; a pressing step of laminating a second substrate F2 on the cell 2 and pressing an obtained laminate L; a peeling step of peeling at least one of the first substrate F1 and the second substrate F2 from the cell 2; and a laminating step of alternatingly laminating the cell 2 and a current collector 3 such that a single current collector 3 is arranged between two cells 2.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] Conventionally, there has been known an all-solid-state battery including an electrode layer having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, a positive electrode current collector in contact with the positive electrode layer of the electrode layer, and a negative electrode current collector in contact with the negative electrode layer of the electrode layer (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-125268 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the all-solid-state battery described in Patent Document 1, there is a demand for further improvement in energy density.

[0005] The present invention provides a method for producing an all-solid-state battery capable of improving the energy density, and an all-solid-state battery. [Means for solving the problem]

[0006] The present invention [1] includes a method for manufacturing an all-solid-state battery, the method including: a cell formation step of dry-forming a cell on a first substrate, the cell having a positive electrode layer made from a powder containing a positive electrode active material, a negative electrode layer made from a powder containing a negative electrode active material, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer and made from a powder of a solid electrolyte; a pressing step of stacking a second substrate on the cell and pressing the resulting stack; a peeling step of peeling off at least one of the first substrate and the second substrate from the cell; and a stacking step of alternately stacking the cells and the current collectors so that one current collector is disposed between two of the cells.

[0007] According to such a method, cells formed by a dry process on a first substrate are pressed between the first substrate and a second substrate to solidify them, and then at least one of the first substrate and the second substrate is peeled off, and the cells and the current collectors are stacked alternately so that one current collector is disposed between two cells.

[0008] This makes it possible to manufacture an all-solid-state battery that has cells manufactured by a dry process and is of a bi-cell type.

[0009] Therefore, the obtained all-solid-state battery has suppressed the decrease in power generation efficiency caused by voids generated in the cell when the solvent evaporates and resins such as binders, compared to an all-solid-state battery having a cell manufactured by a wet method. In addition, the obtained all-solid-state battery is of a bi-cell type, and thus the volume and weight are reduced.

[0010] As a result, the method for producing an all-solid-state battery of the present invention can improve the energy density of the produced all-solid-state battery.

[0011] The present invention [2] includes the method for producing an all-solid-state battery according to the above [1] or [2], wherein the lamination step includes a first step of laminating the current collector on a first cell, and a second step of laminating a second cell on the current collector following the first step, and in the second step, when the negative electrode layer of the first cell is in contact with the current collector, the second cell is laminated on the current collector such that the negative electrode layer of the second cell is in contact with the current collector, and when the positive electrode layer of the first cell is in contact with the current collector, the second cell is laminated on the current collector such that the positive electrode layer of the second cell is in contact with the current collector.

[0012] According to this method, it is possible to manufacture a bi-cell type all-solid-state battery in which the first cell and the second cell are in contact with one current collector.

[0013] The present invention [3] includes the method for producing an all-solid-state battery according to the above [1], wherein the current collector has a conductor and an insulating member laminated on a peripheral portion of the conductor, and in the lamination step, the cell is laminated on the conductor and the insulating member is disposed around the cell.

[0014] According to this method, a current collector having an insulating material laminated around the periphery of a conductor is used, so that an all-solid-state battery can be manufactured through a simple process of alternately laminating cells and current collectors.

[0015] The present invention [4] includes the method for producing an all-solid-state battery according to the above [3], further comprising an adhesive layer in which the insulating member is laminated on one side of the conductor and the current collector is laminated on the other side of the conductor at a peripheral portion of the conductor.

[0016] According to this method, when a cell is stacked on one current collector and another current collector is stacked on the cell, the adhesive layer of the other current collector can be adhered to the insulating member of the first current collector.

[0017] This makes it possible to suppress a short circuit between one current collector and another current collector.

[0018] The present invention [5] includes the method for manufacturing an all-solid-state battery according to the above [3] or [4], wherein the current collector has a notch cut from an edge of the conductor to the inside of the insulating member, and in the stacking step, a jig is placed in the notch to position the cell with respect to the current collector so that the edge of the cell contacts the jig.

[0019] According to such a method, the cells and the current collectors can be easily stacked while preventing the position of the cells from shifting relative to the current collectors.

[0020] The present invention [6] includes an all-solid-state battery comprising: a plurality of cells, each having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; and a plurality of current collectors, the cells and the current collectors being alternately stacked such that one current collector is disposed between two of the cells; and the current collectors having a conductor in contact with the cells and an insulating member laminated on the periphery of the conductor.

[0021] According to this configuration, the cells and the current collectors are alternately stacked so that one current collector is disposed between two cells, that is, the all-solid-state battery has a bi-cell type stacked structure.

[0022] Therefore, the energy density can be improved.

[0023] The current collector also has a conductor and an insulating member laminated on the periphery of the conductor.

[0024] Therefore, by simply stacking cells and current collectors alternately, it is possible to manufacture an all-solid-state battery while preventing short circuits between conductors.

[0025] The present invention [7] includes the all-solid-state battery according to the above [6], wherein the current collector has a notch cut from an edge of the conductor to the inside of the insulating member.

[0026] According to this configuration, the notch can be used to easily stack the cells and the current collectors while preventing the position of the cells from shifting relative to the current collectors.

[0027] Furthermore, by cutting out a portion of the insulating member, the amount of insulating member used is reduced, which makes it possible to suppress deterioration of the cell caused by moisture in the insulating member. Effect of the Invention

[0028] According to the method for producing an all-solid-state battery of the present invention, it is possible to improve the energy density of the produced all-solid-state battery.

[0029] Moreover, according to the all-solid-state battery of the present invention, it is possible to improve the energy density. [Brief description of the drawings]

[0030] [Figure 1] Fig. 1A is a plan view of an all-solid-state battery according to one embodiment of the present invention, and Fig. 1B is a cross-sectional view taken along line AA of the all-solid-state battery shown in Fig. 1A. [Diagram 2] Fig. 2A is a cross-sectional view showing the layer structure of the cell shown in Fig. 1B, and Fig. 2B is an enlarged view of the all-solid-state battery shown in Fig. 1B. [Diagram 3] Fig. 3A is a plan view of the positive electrode current collector shown in Fig. 2B, and Fig. 3B is a cross-sectional view taken along line BB of the positive electrode current collector shown in Fig. 3A. [Figure 4] FIG. 4 is a cross-sectional view taken along CC of the all-solid-state battery shown in FIG. 1A. [Diagram 5] 5A and 5B are process diagrams illustrating a method for manufacturing an all-solid-state battery. Fig. 5A shows a state in which the opening of the screen is filled with a positive electrode mixture in the cell formation process. Fig. 5B shows a state in which the positive electrode mixture in the opening is transferred onto a first substrate to form a positive electrode layer on the first substrate in the cell formation process. [Figure 6]6A to 6C are process diagrams illustrating the manufacturing method of an all-solid-state battery following FIG. 5B. FIG. 6A shows a state in which a solid electrolyte layer is formed on a positive electrode layer and a negative electrode layer is formed on the solid electrolyte layer in a cell formation process. FIG. 6B shows a pressing process. FIG. 6C shows a peeling process. [Figure 7] 7A and 7B are process diagrams illustrating the manufacturing method of an all-solid-state battery following FIG. 6C. FIG. 7A shows a state in which a first cell is stacked on a positive electrode current collector in a stacking process. FIG. 7B shows a state in which the first cell is positioned relative to the positive electrode current collector in a first direction in a stacking process. [Figure 8] 8A and 8B are process diagrams for explaining the manufacturing method of the all-solid-state battery following FIG. 7B. FIG. 8A shows a state in which the first cell is positioned relative to the positive electrode current collector in the second direction in the stacking step. FIG. 8B shows a state in which the negative electrode current collector is stacked on the first cell, and the second cell is stacked on the negative electrode current collector in the stacking step. [Figure 9] 9A and 9B are process diagrams for explaining the manufacturing method of the all-solid-state battery following FIG. 8B. FIG. 9A shows a state in which the second cell is positioned relative to the negative electrode current collector in the first direction in the stacking process. FIG. 9B shows a state in which the second cell is positioned relative to the negative electrode current collector in the second direction in the stacking process. [Figure 10] FIG. 10 is a perspective view of a manufacturing apparatus that can be used in the lamination process shown in FIGS. 7A to 9B. [Figure 11] FIG. 11 is a plan view of the manufacturing apparatus shown in FIG. 10, showing a state in which each moving member is disposed at the separated position. [Figure 12] FIG. 12 shows a state in which the moving members shown in FIG. 11 are arranged in close proximity to each other. [Figure 13] FIG. 13 shows a state in which the positive electrode current collector is placed on the support table of the manufacturing apparatus shown in FIG. [Figure 14] FIG. 14, subsequent to FIG. 13, shows a state in which the positive electrode current collector is positioned with respect to the support table in the first direction. [Figure 15]FIG. 15, subsequent to FIG. 14, shows a state in which the positive electrode current collector is positioned with respect to the support table in a second direction. [Figure 16] 16A and 16B are cross-sectional views for explaining a laminated structure of an all-solid-state battery according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] 1.All-solid-state battery The all-solid-state battery 1 will be described.

[0032] As shown in FIGS. 1A and 1B, the all-solid-state battery 1 includes a plurality of cells 2, a plurality of current collectors 3, a positive electrode lead 4, a negative electrode lead 5, and an exterior material 6.

[0033] (1) Cell In this embodiment, the cell 2 has a sheet shape. When viewed from the thickness direction of the cell 2, the cell 2 has a substantially rectangular shape. The shape of the cell 2 is not limited. The cell 2 may have a plate shape or a film shape. Also, the cell 2 may have a substantially circular shape when viewed from the thickness direction of the cell 2.

[0034] The thickness of the cell 2 is, for example, 100 μm or more, preferably 200 μm or more, and for example, 1000 μm or less, preferably 800 μm or less.

[0035] 2A, the cell 2 has a positive electrode layer 21, a negative electrode layer 22, and a solid electrolyte layer 23. The cell 2 is a bare cell. The cell 2 is composed of the positive electrode layer 21, the negative electrode layer 22, and the solid electrolyte layer 23. The cell 2 does not have a current collector.

[0036] (1-1) Positive electrode layer The positive electrode layer 21 is disposed away from the negative electrode layer 22 in the thickness direction of the cell 2. The positive electrode layer 21 is disposed on the opposite side of the solid electrolyte layer 23 to the negative electrode layer 22 in the thickness direction of the cell 2. The positive electrode layer 21 is in contact with the solid electrolyte layer 23 but is not in contact with the negative electrode layer 22.

[0037] The positive electrode layer 21 is made of a powder containing a positive electrode active material. In this embodiment, the positive electrode layer 21 does not contain a resin such as a binder. In this embodiment, the positive electrode layer 21 is made of a mixture of a powder of the positive electrode active material and a powder of a solid electrolyte. The positive electrode layer 21 does not have to contain a solid electrolyte. The positive electrode layer 21 may be made of only the positive electrode active material.

[0038] The positive electrode active material may be, for example, a lithium-containing oxide. The lithium-containing oxide may, for example, be a lithium-nickel composite oxide (LiNi X M 1-X O2), lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium nickel cobalt aluminum oxide (LiNi 0.8 Co 0.15 Al 0.05 O2, NCA-based layered oxide), lithium manganate (spinel-type lithium manganate (LiMn2O4)), and Li-excess composite oxide (Li2MnO3-LiMO2).

[0039] The positive electrode active material is not limited to lithium-containing oxides as long as it is capable of inserting and extracting lithium ions. Examples of the positive electrode active material include olivine compounds (LiMPO4) and sulfur-containing compounds (Li2S).

[0040] In the above chemical formula, M represents a transition metal.

[0041] As the positive electrode active material, from the viewpoint of easily obtaining a high capacity, a lithium-containing oxide containing at least one selected from the group consisting of Co, Ni, and Mn is preferably used.

[0042] In addition, from the viewpoint of improving rate characteristics, the surface of the positive electrode active material may be covered with a coating material.

[0043] Coating materials include, for example, Li4Ti5O 12, LiTaO3, Li4NbO3, LiAlO2, Li2ZrO3, Li2WO4, Li2TiO3, Li2B4O7, Li3PO4, Li2MoO4, LiBO2, alumina (Al2O3), and carbon (C).

[0044] The positive electrode active materials can be used alone or in combination of two or more kinds.

[0045] The solid electrolyte exhibits lithium ion conductivity. Examples of the solid electrolyte include an organic solid electrolyte and an inorganic solid electrolyte.

[0046] Inorganic solid electrolytes include, for example, sulfides, oxides, nitrides, and hydrides.

[0047] The sulfide may, for example, contain Li2S and another sulfide containing at least one element selected from the group consisting of Group 13 elements, Group 14 elements, and Group 15 elements of the periodic table.

[0048] Examples of Group 13, 14 and 15 elements of the periodic table include P, Si, Ge, As, Sb and Al, preferably P, Si and Ge, and more preferably P.

[0049] Specifically, sulfides include, for example, Li2S-SiS2, Li2S-P2S5, Li2S-GeS2, Li2S-B2S3, Li2S-Ga2S3, Li2S-Al2S3, Li2S-GeS2-P2S5, Li2S-Al2S3-P2S5, Li2S-P2S3, Li2S-P2S3-P2S5, LiX-Li2S-P2S5, LiX-Li2S-SiS2, and LiX-Li2S-B2S3 (X: I, Br, or Cl).

[0050] As the solid electrolyte, preferably, an inorganic solid electrolyte is used, more preferably, a sulfide is used. The solid electrolyte can be used alone or in combination of two or more kinds. The ratio of the positive electrode active material to the solid electrolyte is not limited.

[0051] The positive electrode layer 21 has a thickness of, for example, 50 μm or more, or preferably 100 μm or more. The positive electrode layer 21 has a thickness of, for example, 500 μm or less, or preferably 300 μm or less.

[0052] (1-2) Negative electrode layer The negative electrode layer 22 is disposed away from the positive electrode layer 21 in the thickness direction of the cell 2. The negative electrode layer 22 is disposed on the opposite side of the solid electrolyte layer 23 to the positive electrode layer 21 in the thickness direction of the cell 2. The negative electrode layer 22 is in contact with the solid electrolyte layer 23 but is not in contact with the positive electrode layer 21.

[0053] The negative electrode layer 22 is made of a powder containing a negative electrode active material. The negative electrode layer 22 does not contain a resin such as a binder. In this embodiment, the negative electrode layer 22 is made of a mixture of a powder of the negative electrode active material and a powder of a solid electrolyte. The negative electrode layer 22 does not have to contain a solid electrolyte. The negative electrode layer 22 may be made of only the negative electrode active material.

[0054] The negative electrode active material is not limited as long as it is a material capable of inserting and extracting lithium ions. Examples of the negative electrode active material include carbon materials, metals and alloys thereof, semimetals, and compounds of metals or semimetals.

[0055] Examples of carbon materials include graphite (natural graphite, artificial graphite), hard carbon, and amorphous carbon. Examples of metals and their alloys include lithium and its alloys. Examples of metalloids include silicon. Examples of metal or metalloid compounds include oxides, sulfides, nitrides, hydrates, and silicides (lithium silicides) of metals or metalloids. Examples of metal or metalloid oxides include titanium oxide and silicon oxide.

[0056] The negative electrode active material may be used alone or in combination of two or more thereof. For example, silicon oxide and a carbon material may be used in combination as the negative electrode active material.

[0057] Examples of the solid electrolyte contained in the negative electrode layer 22 include the above-mentioned solid electrolytes. Preferably, the solid electrolyte contained in the negative electrode layer 22 is the same as the solid electrolyte contained in the positive electrode layer 21. The ratio of the negative electrode active material to the solid electrolyte is not limited.

[0058] The thickness of the negative electrode layer 22 is approximately the same as the thickness of the positive electrode layer 21. The thickness of the negative electrode layer 22 is, for example, 50 μm or more, or preferably 100 μm or more. The thickness of the negative electrode layer 22 is, for example, 500 μm or less, or preferably 300 μm or less.

[0059] (1-3) Solid electrolyte layer The solid electrolyte layer 23 is disposed between the positive electrode layer 21 and the negative electrode layer 22 in the thickness direction of the cell 2. The solid electrolyte layer 23 is made of a powder of a solid electrolyte. The solid electrolyte layer 23 does not contain a resin such as a binder.

[0060] The solid electrolyte may be, for example, any of the solid electrolytes described above. Preferably, the solid electrolyte is the same as the solid electrolyte contained in the positive electrode layer 21.

[0061] The solid electrolyte layer 23 is thinner than the positive electrode layer 21 and the negative electrode layer 22. The solid electrolyte layer 23 has a thickness of, for example, 10 μm or more, or preferably 30 μm or more. The solid electrolyte layer 23 has a thickness of, for example, 300 μm or less, or preferably 100 μm or less.

[0062] (2) Current collector 2B, each of the multiple current collectors 3 is alternately stacked with each of the multiple cells 2. The multiple current collectors 3 include a positive electrode current collector 3A and a negative electrode current collector 3B. The positive electrode current collector 3A contacts the positive electrode layer 21 of the cell 2. The negative electrode current collector 3B contacts the negative electrode layer 22 of the cell 2.

[0063] Specifically, in this embodiment, the positive electrode current collector 3A, the first cell 2A, the negative electrode current collector 3B, the second cell 2B, and the positive electrode current collector 3A are stacked in this order from one side to the other side in the stacking direction of the cells 2 and the current collectors 3. In the stacking direction, one negative electrode current collector 3B is disposed between the negative electrode layer 22 of the first cell 2A and the negative electrode layer 22 of the second cell 2B. In other words, one current collector 3 is disposed between two cells 2 in the stacking direction.

[0064] 3A and 3B, the current collector 3 has a conductor 31, an insulating member 32, and an adhesive layer 33. The current collector 3 also has a plurality of notches 34A, 34B, 34C, 34D, 34E, 34F, 34G, and 34H in its peripheral portion. The number of notches is not limited.

[0065] (2-1) Conductors The conductor 31 is made of, for example, a metal and has a laminated portion 311 and a tab 312.

[0066] The laminated portion 311 extends in a first direction and a second direction. The first direction is perpendicular to the lamination direction. The second direction is perpendicular to both the first direction and the lamination direction. The laminated portion 311 has a sheet shape. The laminated portion 311 has one side S1 and the other side S2 in the thickness direction. In other words, the conductor 31 has one side S1 and the other side S2 in the thickness direction. The laminated portion 311 contacts the cell 2. When the current collector 3 is a positive electrode collector 3A, the laminated portion 311 contacts the positive electrode layer 21 of the cell 2. When the current collector 3 is a negative electrode collector 3B, the laminated portion 311 contacts the negative electrode layer 22 of the cell 2. The laminated portion 311 has a substantially rectangular shape when viewed from the lamination direction. The laminated portion 311 has a plurality of edges E1, E2, E3, and E4.

[0067] Edge E1 is disposed at one end of stacked portion 311 in the first direction. Edge E1 extends in the second direction. Edge E1 has a straight line shape. Edge E2 is disposed at the other end of stacked portion 311 in the first direction. Edge E2 extends in the second direction. Edge E2 has a straight line shape. Edge E3 is disposed at one end of stacked portion 311 in the second direction. Edge E3 extends in the first direction. Edge E3 has a straight line shape. Edge E4 is disposed at the other end of stacked portion 311 in the second direction. Edge E4 extends in the first direction. Edge E4 has a straight line shape.

[0068] The tab 312 is disposed on an edge of the laminated portion 311. In this embodiment, the tab 312 is disposed on an edge E3 on one side of the laminated portion 311 in the second direction. The tab 312 protrudes from the edge E3 of the laminated portion 311. The tab 312 may be a member separate from the laminated portion 311 and joined to the laminated portion 311. The tab 312 has a belt shape. The tab 312 does not contact the cell 2. When the current collector 3 is a positive electrode current collector 3A, the conductor 31 has a positive electrode tab 312A as the tab 312. When the current collector 3 is a negative electrode current collector 3B, the conductor 31 has a negative electrode tab 312B as the tab 312. In a state in which the cell 2, the positive electrode current collector 3A, and the negative electrode current collector 3B are stacked, the negative electrode tab 312B is disposed away from the positive electrode tab 312A. In a state in which the cell 2, the positive electrode current collector 3A, and the negative electrode current collector 3B are stacked, the negative electrode tab 312B does not overlap the positive electrode tab 312A in the stacking direction.

[0069] The thickness of the conductor 31 is, for example, 1 μm or more, preferably 5 μm or more, and for example, 100 μm or less, preferably 50 μm or less.

[0070] Examples of materials for the conductor 31 include copper (Cu), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), aluminum (Al), germanium (Ge), indium (In), lithium (Li), tin (Sn), and alloys thereof.

[0071] (2-2) Insulating materials As shown in FIG. 3B, the insulating member 32 is laminated on one surface S1 of the conductor 31. As shown in FIG. 3A, the insulating member 32 is disposed on the laminated portion 311 of the conductor 31. The insulating member 32 is laminated on the peripheral portion of the laminated portion 311 of the conductor 31. The insulating member 32 has a substantially rectangular frame shape when viewed from the lamination direction. The insulating member 32 has a portion 32A extending along the edge E1 of the conductor 31, a portion 32B extending along the edge E2 of the conductor 31, a portion 32C extending along the edge E3 of the conductor 31, and a portion 32D extending along the edge E4 of the conductor 31. The insulating member 32 is not disposed on the tab 312 of the conductor 31.

[0072] In a state where the cell 2, the positive electrode current collector 3A, and the negative electrode current collector 3B are stacked, the insulating member 32 is disposed around the cell 2. As shown in Fig. 1B, in a state where the cell 2, the positive electrode current collector 3A, and the negative electrode current collector 3B are stacked, the insulating member 32 is disposed between the positive electrode current collector 3A and the negative electrode current collector 3B in the stacking direction. In a state where the cell 2, the positive electrode current collector 3A, and the negative electrode current collector 3B are stacked, the insulating member 32 insulates the positive electrode current collector 3A from the negative electrode current collector 3B.

[0073] In the stacking direction, the thickness of the insulating member 32 is thinner than the thickness of the cell 2. When the current collector 3 does not have the adhesive layer 33, the thickness of the insulating member 32 may be the same as the thickness of the cell 2. The thickness of the insulating member 32 is, for example, 50 μm or more, preferably 75 μm or more, and for example, 500 μm or less, preferably 400 μm or less.

[0074] Examples of materials for the insulating member 32 include polyethylene terephthalate and polyimide.

[0075] (2-3) Adhesive layer As shown in Fig. 3B, the adhesive layer 33 is laminated on the other surface S2 of the conductor 31 at the peripheral portion of the conductor 31. The current collector 3 does not need to have the adhesive layer 33. As shown in Fig. 1B, in a state in which one cell 2 is laminated between two current collectors 3, the adhesive layer 33 of the current collector 3 arranged on the other side of the cell 2 in the stacking direction is adhered to the insulating member 32 of the current collector 3 arranged on one side of the cell 2 in the stacking direction.

[0076] The sum of the thickness of the adhesive layer 33 and the thickness of the insulating member 32 is not more than the thickness of the cell 2. The thickness of the adhesive layer 33 is, for example, 30 μm or more, preferably 50 μm or more, and for example, 300 μm or less, preferably 200 μm or less.

[0077] The adhesive layer 33 is preferably insulating. Examples of the material for the adhesive layer 33 include resins such as acrylic, polyimide, and silicone, and nonwoven fabrics impregnated with these resins.

[0078] (2-4) Notch As shown in Fig. 3A, the notches 34A and 34B are disposed at one end of the current collector 3 in the first direction. Each of the notches 34A and 34B is cut out from the edge E1 of the conductor 31 to the inside of the insulating member 32. In detail, each of the notches 34A and 34B extends in the first direction from the edge E1 toward the edge E2 of the conductor 31. Each of the notches 34A and 34B extends in the first direction to between the portion 32A and the portion 32B of the insulating member 32. The insulating member 32 is interrupted at the portion where the notches 34A and 34B are formed.

[0079] The notches 34C and 34D are disposed at the other end of the current collector 3 in the first direction. Each of the notches 34C and 34D is cut from the edge E2 of the conductor 31 to the inside of the insulating member 32. In detail, each of the notches 34C and 34D extends from the edge E2 of the conductor 31 toward the edge E1 in the first direction. Each of the notches 34C and 34D extends to between the portion 32A and the portion 32B of the insulating member 32 in the first direction. The insulating member 32 is interrupted at the portion where the notches 34C and 34D are formed. The notch 34C is disposed at a distance from the notch 34A in the first direction. The notch 34D is disposed at a distance from the notch 34B in the first direction.

[0080] The notches 34E and 34F are disposed at one end of the current collector 3 in the second direction. Each of the notches 34E and 34F is cut from the edge E3 of the conductor 31 to the inside of the insulating member 32. More specifically, each of the notches 34E and 34F extends in the second direction from the edge E3 to the edge E4 of the conductor 31. Each of the notches 34E and 34F extends in the second direction to between the portion 32C and the portion 32D of the insulating member 32. The insulating member 32 is interrupted at the portion where the notches 34E and 34F are formed.

[0081] The notches 34G and 34H are disposed at the other end of the current collector 3 in the second direction. Each of the notches 34G and 34H is cut from the edge E4 of the conductor 31 to the inside of the insulating member 32. In detail, each of the notches 34G and 34H extends from the edge E4 of the conductor 31 toward the edge E3 in the second direction. Each of the notches 34G and 34H extends to between the portion 32C and the portion 32D of the insulating member 32 in the second direction. The insulating member 32 is interrupted at the portion where the notches 34G and 34H are formed. The notch 34G is disposed at a distance from the notch 34E in the second direction. The notch 34H is disposed at a distance from the notch 34F in the first direction.

[0082] When the cell 2 and the current collector 3 are stacked, the cell 2 is disposed between the notches 34A, 34B and the notches 34C, 34D in the first direction. When the cell 2 and the current collector 3 are stacked, the cell 2 is disposed between the notches 34E, 34F and the notches 34G, 34H in the second direction.

[0083] The shapes of the notches 34A, 34B, 34C, 34D, 34E, 34F, 34G, and 34H are not limited. Examples of the shapes of the notches 34A, 34B, 34C, 34D, 34E, 34F, 34G, and 34H include an arc shape, a triangle shape, a rectangle shape, and a trapezoid shape. The shapes of the notches 34A, 34B, 34C, 34D, 34E, 34F, 34G, and 34H may be the same or different.

[0084] (3) Positive and negative leads As shown in Fig. 1A, a portion of the positive electrode lead 4 is exposed from the exterior material 6. As shown in Fig. 4, the positive electrode lead 4 is joined to a positive electrode tab 312A inside the exterior material 6. This allows the positive electrode lead 4 to be electrically connected to the positive electrode current collector 3A. The positive electrode lead 4 is not connected to the negative electrode current collector 3B.

[0085] As shown in Fig. 1A, a portion of the negative electrode lead 5 is exposed from the exterior material 6. The negative electrode lead 5 is joined to a negative electrode tab 312B (see Fig. 3A) inside the exterior material 6. As a result, the negative electrode lead 5 is electrically connected to the negative electrode current collector 3B (see Fig. 1B). The negative electrode lead 5 is not connected to the positive electrode current collector 3A.

[0086] Each of the positive electrode lead 4 and the negative electrode lead 5 has, for example, a substantially rectangular flat plate shape. Examples of the material of the positive electrode lead 4 and the negative electrode lead 5 include pure metals and alloys. Examples of the pure metals include copper, nickel, aluminum, gold, and platinum. Examples of the alloys include alloys of the above-mentioned pure metals, stainless steel, and titanium. The positive electrode lead 4 and the negative electrode lead 5 may be plated. For example, the positive electrode lead 4 and the negative electrode lead 5 may be copper plates having a nickel plating layer and a gold plating layer.

[0087] (4) Exterior materials 1A and 1B, an exterior material 6 covers a laminate of cells 2 and current collectors 3. An example of the exterior material 6 is a metal laminate film in which resin films are laminated on both sides of a metal foil.

[0088] 2. Manufacturing method of all-solid-state batteries Next, a method for manufacturing the all-solid-state battery 1 will be described.

[0089] The method for manufacturing the all-solid-state battery 1 includes a cell formation step (see FIGS. 5A to 6A), a pressing step (see FIG. 6B), a cutting step, a peeling step (see FIG. 6C), and a lamination step (see FIGS. 7A to 9B).

[0090] (1) Cell formation process In the cell formation step, the cells 2 are formed on the first substrate F1 by a dry process. Specifically, the cells 2 are formed on the first substrate F1 by electrostatic screen printing.

[0091] In detail, first, a positive electrode mixture is prepared by mixing a powder of a positive electrode active material and a powder of a solid electrolyte. A negative electrode mixture is prepared by mixing a powder of a negative electrode active material and a powder of a solid electrolyte. The positive electrode mixture and the negative electrode mixture do not contain a resin such as a binder, and a liquid such as an organic solvent. The positive electrode mixture is preferably composed of a powder of a positive electrode active material and a powder of a solid electrolyte. The negative electrode mixture is preferably composed of a powder of a negative electrode active material and a powder of a solid electrolyte.

[0092] Next, as shown in FIG. 5A, the positive electrode composite material M1 is filled into the openings OP of a screen SC having a predetermined volume.

[0093] 5B, the positive electrode composite material M1 in the opening OP is pushed out toward the first substrate F1 and transferred onto the first substrate F1 by electrostatic force, thereby forming the positive electrode layer 21 on the first substrate F1.

[0094] Next, in the same manner as in the formation of the positive electrode layer 21, the solid electrolyte layer 23 is formed on the positive electrode layer 21, and the negative electrode layer 22 is formed on the solid electrolyte layer 23.

[0095] As a result, the cell 2 is formed on the first substrate F1, as shown in FIG. 6A.

[0096] The material of the first substrate F1 is not limited as long as it can be electrostatically screen printed. Examples of the material of the first substrate F1 include metal foil. Examples of the metal foil include aluminum foil.

[0097] As long as the cell 2 can be formed, the order of forming the positive electrode layer 21, the negative electrode layer 22, and the solid electrolyte layer 23 is not limited. The negative electrode layer 22 may be formed on the first substrate F1, the solid electrolyte layer 23 may be formed on the negative electrode layer 22, and the positive electrode layer 21 may be formed on the solid electrolyte layer 23.

[0098] (2) Pressing process The pressing step is carried out after the cell forming step. As shown in Fig. 6B, in the pressing step, the second substrate F2 is laminated on the cell 2, and the obtained laminate L is pressed. The obtained laminate L is a laminate of the first substrate F1, the cell 2, and the second substrate F2.

[0099] The material of the second substrate F2 may be the same as or different from the material of the first substrate F1.

[0100] The pressure applied to the laminate L is not limited as long as it is capable of forming the cells 2. The pressure applied to the laminate L is, for example, 50 MPa or more, preferably 300 MPa or more, and for example, 5000 MPa or less, preferably 3000 MPa or less.

[0101] (3) Cutting process The cutting step is performed after the pressing step. In the cutting step, the cell 2 is cut into a desired shape. In this embodiment, the cell 2 is cut into a substantially rectangular shape when viewed in the thickness direction of the cell 2.

[0102] (4) Peeling process The peeling step is performed after the cutting step. The peeling step may be performed before the cutting step. In the peeling step, as shown in FIG. 6C, at least one of the first substrate F1 and the second substrate F2 is peeled off from the cell 2. In this embodiment, both the first substrate F1 and the second substrate F2 are peeled off from the cell 2. As will be described in a modified example later, in order to prevent the cell 2 from collapsing, only one of the first substrate F1 and the second substrate F2 may be peeled off from the cell 2.

[0103] (5)Lamination process In the lamination step, the cells 2 and the current collectors 3 are laminated alternately.

[0104] Specifically, in the stacking step, first, as shown in FIG. 7A, jigs RA, RB, RE, and RF are placed in the notches 34A, 34B, 34E, and 34F of the positive electrode current collector 3A. Specifically, the jig RA is placed in the notch 34A, the jig RB is placed in the notch 34B, the jig RE is placed in the notch 34E, and the jig RF is placed in the notch 34F. Each of the jigs RA, RB, RE, and RF extends in the stacking direction. Each of the jigs RA, RB, RE, and RF is, for example, a rod. Each of the jigs RA, RB, RE, and RF has a cylindrical shape.

[0105] Next, the first cell 2A is stacked on the positive electrode current collector 3A. More specifically, the first cell 2A is stacked on the conductor 31 of the positive electrode current collector 3A inside the insulating member 32 of the positive electrode current collector 3A. As a result, with the first cell 2A stacked on the conductor 31 of the positive electrode current collector 3A, the insulating member 32 of the positive electrode current collector 3A is disposed around the first cell 2A. Also, with the first cell 2A stacked on the positive electrode current collector 3A, the positive electrode layer 21 (see FIG. 6C) of the first cell 2A comes into contact with the conductor 31 of the positive electrode current collector 3A.

[0106] Next, as shown in FIG. 7B, the first cell 2A is positioned relative to the positive electrode current collector 3A in the first direction so that the edge E11 of the first cell 2A contacts the jigs RA and RB. The edge E11 is an edge at one end of the first cell 2A in the first direction. More specifically, the first cell 2A is pushed toward the jigs RA and RB from the other side in the first direction by the jigs RC and RD. At this time, the jig RC enters the notch 34C, and the jig RD enters the notch 34D. The edge E11 contacts the jigs RA and RB, so that the first cell 2A is positioned relative to the positive electrode current collector 3A in the first direction.

[0107] Next, as shown in FIG. 8A, the first cell 2A is positioned relative to the positive electrode current collector 3A in the second direction so that the edge E12 of the first cell 2A contacts the jigs RE and RF. The edge E12 is an edge at one end of the first cell 2A in the second direction. More specifically, the first cell 2A is pushed toward the jigs RE and RF from the other side in the second direction by the jigs RG and RH. At this time, the jig RG enters the notch 34G, and the jig RH enters the notch 34H. By the edge E12 contacting the jigs RE and RF, the first cell 2A is positioned relative to the positive electrode current collector 3A in the second direction.

[0108] Next, as shown in Fig. 8B, the negative electrode current collector 3B is stacked on the first cell 2A (first step), and jigs RA, RB, RE, and RF are placed in the notches 34A, 34B, 34E, and 34F of the negative electrode current collector 3B. With the negative electrode current collector 3B stacked on the first cell 2A, the conductor 31 of the negative electrode current collector 3B comes into contact with the negative electrode layer 22 (see Fig. 6C) of the first cell 2A.

[0109] Next, the second cell 2B is stacked on the negative electrode current collector 3B (second step). More specifically, the second cell 2B is stacked on the conductor 31 of the negative electrode current collector 3B inside the insulating member 32 of the negative electrode current collector 3B. With the second cell 2B stacked on the negative electrode current collector 3B, the negative electrode layer 22 of the second cell 2B contacts the conductor 31 of the negative electrode current collector 3B. In other words, when the negative electrode layer 22 of the first cell 2A is in contact with the current collector 3 (negative electrode current collector 3B), the second cell 2B is stacked on the negative electrode current collector 3B so that the negative electrode layer 22 of the second cell 2B contacts the negative electrode current collector 3B.

[0110] When the positive electrode layer 21 of the first cell 2A is in contact with the current collector 3 (positive electrode current collector 3A), the second cell 2B is stacked on top of the positive electrode current collector 3A so that the positive electrode layer 21 of the second cell 2B is in contact with the positive electrode current collector 3A.

[0111] In this manner, in the stacking process, the cells 2 and the current collectors 3 are stacked alternately so that one current collector 3 (in this embodiment, the negative electrode current collector 3B) is disposed between two cells 2 (the first cell 2A and the second cell 2B).

[0112] Furthermore, as shown in Figures 9A and 9B, each time a cell 2 is stacked on a current collector 3, the cell 2 is positioned relative to the current collector 3 in a first direction so that an edge E11 of the cell 2 contacts the jigs RA and RB (see Figure 9A), and the cell 2 is positioned relative to the current collector 3 in a second direction so that an edge E12 of the cell 2 contacts the jigs RE and RF (see Figure 9B).

[0113] The stacking process is completed by stacking the desired number of cells 2 and current collectors 3.

[0114] After the lamination step, the positive electrode tab 312A is joined to the positive electrode lead 4, the negative electrode tab 312B is joined to the negative electrode lead 5, and the laminate of the cell 2 and the current collector 3 is vacuum-packed in an exterior material 6.

[0115] This completes the production of the above-mentioned all-solid-state battery 1 (see FIG. 1A).

[0116] 3. All-solid-state battery manufacturing equipment Next, a manufacturing apparatus 10 that can be used in the lamination step of the manufacturing method for the all-solid-state battery 1 described above will be described.

[0117] As shown in FIG. 10, the manufacturing apparatus 10 includes a base 101, a support table 102, four moving members 103A, 103B, 103C, and 103D, a positioning member 104, and two moving members 105A and 105B.

[0118] (1) Base 101 The base 101 supports the support table 102, the four moving members 103A, 103B, 103C, and 103D, the positioning member 104, and the two moving members 105A and 105B. In this embodiment, the base 101 has a flat plate shape. The base 101 extends in a first direction and a second direction. The shape of the base 101 is not limited.

[0119] (2) Support table 102 The support table 102 is fixed to the base 101. In this embodiment, the support table 102 has a substantially rectangular flat plate shape. The support table 102 extends in a first direction and a second direction. The support table 102 is capable of supporting the current collector 3.

[0120] As shown in FIG. 11, the support table 102 has a plurality of grooves 102A, 102B, 102C, 102D, 102E, 102F, 102G, and 102H.

[0121] The grooves 102A and 102B are disposed at one end in the first direction of the support table 102. Each of the grooves 102A and 102B extends from one edge of the support table 102 to the other edge in the first direction.

[0122] The grooves 102C and 102D are disposed at the other end of the support table 102 in the first direction. Each of the grooves 102C and 102D extends from the other edge of the support table 102 toward one side in the first direction. The groove 102C is disposed at a distance from the groove 102A in the first direction. The groove 102D is disposed at a distance from the groove 102B in the first direction.

[0123] The grooves 102E and 102F are disposed at one end in the second direction of the support table 102. Each of the grooves 102E and 102F extends in the second direction from one edge of the support table 102 to the other edge.

[0124] The grooves 102G and 102H are disposed at the other end of the support table 102 in the second direction. Each of the grooves 102G and 102H extends from the other edge of the support table 102 toward one side in the second direction. The groove 102G is disposed at a distance from the groove 102E in the second direction. The groove 102H is disposed at a distance from the groove 102F in the second direction.

[0125] (3) Moving members 103A, 103B, 103C, 103D As shown in Fig. 10, the moving member 103A is disposed on one side of the support table 102 in the first direction. The moving member 103A has the above-mentioned jigs RA and RB. The shape of the moving member 103A is not limited. In this embodiment, the moving member 103A extends in the second direction. The moving member 103A has a substantially rectangular flat plate shape.

[0126] The moving member 103B is disposed on the other side of the support table 102 in the first direction. The moving member 103B has the above-mentioned jigs RC and RD. The shape of the moving member 103B is not limited. In this embodiment, the moving member 103B extends in the second direction. The moving member 103B has a substantially rectangular flat plate shape.

[0127] The moving member 103C is disposed on one side of the support table 102 in the second direction. The moving member 103C has the above-mentioned jigs RE and RF. The shape of the moving member 103C is not limited. In this embodiment, the moving member 103C extends in the first direction. The moving member 103C has a substantially rectangular flat plate shape.

[0128] The moving member 103D is disposed on the other side of the support table 102 in the second direction. The moving member 103D has the above-mentioned jigs RG and RH. The shape of the moving member 103D is not limited. In this embodiment, the moving member 103D extends in the first direction. The moving member 103D has a substantially rectangular flat plate shape.

[0129] Each of the moving members 103A, 103B, 103C, and 103D is movably attached to the base 101.

[0130] As shown in Fig. 11 and Fig. 12, the movable member 103A is movable in a first direction between a first separated position (see Fig. 11) and a first close position (see Fig. 12). When the movable member 103A is disposed at the first separated position, the movable member 103A is disposed away from the support table 102 in the first direction. When the movable member 103A is disposed at the first close position, the movable member 103A is disposed closer to the support table 102 in the first direction than the first separated position. When the movable member 103A is disposed at the first close position, the jig RA enters into the groove 102A of the support table 102, and the jig RB enters into the groove 102B of the support table 102.

[0131] The movable member 103B is movable in the first direction between a second separated position (see FIG. 11) and a second close position (see FIG. 12). When the movable member 103B is disposed at the second separated position, the movable member 103B is disposed away from the support table 102 in the first direction. When the movable member 103B is disposed at the second close position, the movable member 103B is disposed closer to the support table 102 in the first direction than the second separated position. When the movable member 103B is disposed at the second close position, the jig RC enters into the groove 102C of the support table 102, and the jig RD enters into the groove 102D of the support table 102.

[0132] The movable member 103C is movable in the second direction between a third separated position (see FIG. 11) and a third close position (see FIG. 12). When the movable member 103C is disposed at the third separated position, the movable member 103C is disposed away from the support table 102 in the second direction. When the movable member 103C is disposed at the third close position, the movable member 103C is disposed closer to the support table 102 in the second direction than the third separated position. When the movable member 103C is disposed at the third close position, the jig RE enters into the groove 102E of the support table 102, and the jig RF enters into the groove 102F of the support table 102.

[0133] The movable member 103D is movable in the second direction between a fourth separated position (see FIG. 11) and a fourth close position (see FIG. 12). When the movable member 103D is disposed at the fourth separated position, the movable member 103D is disposed away from the support table 102 in the second direction. When the movable member 103D is disposed at the fourth close position, the movable member 103D is disposed closer to the support table 102 in the second direction than the fourth separated position. When the movable member 103D is disposed at the fourth close position, the jig RG enters into the groove 102G of the support table 102, and the jig RH enters into the groove 102H of the support table 102.

[0134] (4) Positioning member 104 10, the positioning member 104 is fixed to the support table 102. With the current collector 3 placed on the support table 102, the positioning member 104 determines the position of the current collector 3 with respect to the support table 102. The positioning member 104 has a first positioning portion 104A and a second positioning portion 104B.

[0135] The first positioning portion 104A is disposed at one end of the support table 102 in the first direction. With the current collector 3 placed on the support table 102, the first positioning portion 104A determines the position of the current collector 3 relative to the support table 102 in the first direction. The first positioning portion 104A extends in the second direction and the stacking direction.

[0136] The second positioning portion 104B is disposed at one end of the support table 102 in the second direction. With the current collector 3 placed on the support table 102, the second positioning portion 104B determines the position of the current collector 3 relative to the support table 102 in the second direction. The second positioning portion 104B extends in the first direction and the stacking direction.

[0137] (5) Moving members 105A and 105B 10, the moving member 105A is disposed on the other side of the support table 102 in the first direction. The moving member 105A has two contact portions 1051A and 1052A and a support portion 1053A.

[0138] The contact portion 1051A is disposed on one side of the moving member 103B in the second direction. The contact portion 1051A extends in the first direction and the stacking direction. In this embodiment, the contact portion 1051A has a substantially rectangular plate shape. The shape of the contact portion 1051A is not limited.

[0139] The contact portion 1052A is disposed away from the contact portion 1051A in the second direction. The contact portion 1052A is disposed on the other side of the moving member 103B in the second direction. The contact portion 1052A extends in the first direction and the stacking direction. In this embodiment, the contact portion 1052A has a plate shape. The shape of the contact portion 1052A is not limited.

[0140] The support portion 1053A supports the contact portion 1051A and the contact portion 1052A. The support portion 1053A extends in the second direction. The contact portion 1051A is attached to one end of the support portion 1053A in the second direction. The contact portion 1052A is attached to the other end of the support portion 1053A in the second direction. The support portion 1053A has a substantially rectangular plate shape. The shape of the support portion 1053A is not limited.

[0141] The moving member 105B is disposed on the other side of the support table 102 in the second direction. The moving member 105B has two contact portions 1051B and 1052B and a support portion 1053B.

[0142] The contact portion 1051B is disposed on the other side of the moving member 103D in the first direction. The contact portion 1051B extends in the second direction and the stacking direction. In this embodiment, the contact portion 1051B has a substantially rectangular plate shape. The shape of the contact portion 1051B is not limited.

[0143] The contact portion 1052B is disposed away from the contact portion 1051B in the first direction. The contact portion 1052B is disposed on one side of the moving member 103D in the first direction. The contact portion 1052B extends in the first direction and the stacking direction. In this embodiment, the contact portion 1052B has a plate shape. The shape of the contact portion 1052B is not limited.

[0144] The support portion 1053B supports the contact portion 1051B and the contact portion 1052B. The support portion 1053B extends in a first direction. The contact portion 1051B is attached to one end of the support portion 1053B in the first direction. The contact portion 1052B is attached to the other end of the support portion 1053B in the first direction. The support portion 1053B has a substantially rectangular plate shape. The shape of the support portion 1053B is not limited.

[0145] Each of the moving members 105A and 105B is movably attached to the base 101.

[0146] As shown in FIGS. 11 and 12, the moving member 105A is movable in the first direction between a fifth separated position (see FIG. 11) and a fifth close position (see FIG. 12). When the moving member 105A is disposed at the fifth separated position, the moving member 105A is disposed away from the support table 102 in the first direction. When the moving member 105A is disposed at the fifth close position, the moving member 105A is disposed closer to the support table 102 in the first direction than the fifth separated position. When the current collector 3 is placed on the support table 102, the contact portion 1051A and the contact portion 1052A can come into contact with the current collector 3 on the support table 102 when the moving member 105A moves from the fifth separated position toward the fifth close position.

[0147] The movable member 105B is movable in the second direction between a sixth separated position (see FIG. 11) and a sixth close position (see FIG. 12). When the movable member 105B is disposed at the sixth separated position, the movable member 105B is disposed away from the support table 102 in the second direction. When the movable member 105B is disposed at the sixth close position, the movable member 105B is disposed closer to the support table 102 in the second direction than the sixth separated position. When the current collector 3 is placed on the support table 102, the abutment portion 1051B and the abutment portion 1052B can abut against the current collector 3 on the support table 102 when the movable member 105B moves from the sixth separated position toward the sixth close position.

[0148] (6) Operation of manufacturing equipment during lamination process Next, the operation of the manufacturing apparatus 10 in the above-mentioned lamination process will be described.

[0149] When the manufacturing apparatus 10 is used in the above-mentioned stacking process, first, as shown in FIG. 13, the positive electrode current collector 3A is placed on the support table 102 in a state in which the movable member 103A is positioned at the first separation position, the movable member 103B is positioned at the second separation position, the movable member 103C is positioned at the third separation position, the movable member 103D is positioned at the fourth separation position, the movable member 105A is positioned at the fifth separation position, and the movable member 105B is positioned at the sixth separation position.

[0150] When the positive electrode current collector 3A is placed on the support table 102, the notches 34A and 34B are positioned at one end of the positive electrode current collector 3A in the first direction, the notches 34C and 34D are positioned at the other end of the positive electrode current collector 3A in the first direction, the notches 34E and 34F are positioned at one end of the positive electrode current collector 3A in the second direction, and the notches 34G and 34H are positioned at the other end of the positive electrode current collector 3A in the second direction.

[0151] 14, the movable member 105A is moved from the fifth separated position to the fifth close position. When the movable member 105A moves from the fifth separated position to the fifth close position, the positive electrode current collector 3A is pushed by the contact portion 1051A and the contact portion 1052A of the movable member 105A and moves toward the first positioning portion 104A. In other words, as the movable member 105A moves from the fifth separated position to the fifth close position, the movable member 105A moves the current collector 3 placed on the support table 102 toward the first positioning portion 104A.

[0152] Positive electrode current collector 3A, pushed by movable member 105A, comes into contact with first positioning portion 104A, whereby positive electrode current collector 3A is positioned on support table 102 in the first direction.

[0153] 15, the movable member 105B is moved from the sixth separated position to the sixth close position. When the movable member 105B moves from the sixth separated position to the sixth close position, the positive electrode current collector 3A is pushed by the contact portion 1051B and the contact portion 1052B of the movable member 105B and moves toward the second positioning portion 104B. In other words, as the movable member 105B moves from the sixth separated position to the sixth close position, the movable member 105B moves the current collector 3 placed on the support table 102 toward the second positioning portion 104B.

[0154] Positive electrode current collector 3A, pushed by movable member 105A, comes into contact with second positioning portion 104B, whereby positive electrode current collector 3A is positioned on support table 102 in the second direction.

[0155] When the positive electrode current collector 3A is positioned on the support table 102 in both the first and second directions, notch 34A overlaps with groove 102A, notch 34B overlaps with groove 102B, notch 34C overlaps with groove 102C, notch 34D overlaps with groove 102D, notch 34E overlaps with groove 102E, notch 34F overlaps with groove 102F, notch 34G overlaps with groove 102G, and notch 34H overlaps with groove 102H.

[0156] Next, the movable member 103A (see FIG. 15) is moved from the first separated position to the first close position, and the movable member 103C (see FIG. 15) is moved from the third separated position to the third close position.

[0157] Then, with the movable member 103A disposed at the first approach position, the jig RA is disposed in the notch 34A, and the jig RB is disposed in the notch 34B, as shown in Fig. 7A. With the movable member 103C disposed at the third approach position, the jig RE is disposed in the notch 34E, and the jig RF is disposed in the notch 34F.

[0158] Next, as described above, the first cell 2A is stacked on the positive electrode current collector 3A. At this time, in order to secure a working space for stacking the first cell 2A on the positive electrode current collector 3A, it is also possible to place the moving member 105A at the fifth spaced position and the moving member 105B at the sixth spaced position before stacking the first cell 2A on the positive electrode current collector 3A.

[0159] Next, the moving member 103B (see FIG. 15) is moved from the second distant position to the second close position.

[0160] Then, with the movable member 103B disposed at the second approach position, as shown in Fig. 7B, the jig RC is disposed in the notch 34C, and the jig RD is disposed in the notch 34D. At this time, as described above, the jig RC, RD push the first cell 2A from the other side in the first direction toward the jig RA, RB. The first cell 2A pushed by the jig RC, RD is positioned with respect to the positive electrode current collector 3A in the first direction by the edge E11 coming into contact with the jig RA, RB.

[0161] In other words, when the current collector 3 is placed on the support table 102, the cell 2 is placed on the current collector 3, and the movable member 103A is positioned at the first close position, the movable member 103B moves from the second separated position toward the second close position, whereby the jigs RC, RD move the cell 2 toward the jigs RA, RB so that the edge E11 of the cell 2 comes into contact with the jigs RA, RB, thereby positioning the cell 2 relative to the current collector 3 in the first direction.

[0162] Next, the movable member 103D (see FIG. 15) is moved from the fourth distant position to the fourth close position.

[0163] 8A, with the movable member 103D disposed at the fourth approach position, the jig RG is disposed in the notch 34G, and the jig RH is disposed in the notch 34H. At this time, as described above, the jig RG, RH push the first cell 2A from the other side in the second direction toward the jig RE, RF. The first cell 2A pushed by the jig RG, RH is positioned relative to the positive electrode current collector 3A in the second direction by the edge E12 coming into contact with the jig RE, RF.

[0164] In other words, when the current collector 3 is placed on the support table 102, the cell 2 is placed on the current collector 3, and the movable member 103C is positioned at the third close position, the movable member 103D moves from the fourth separated position toward the fourth close position, whereby the jigs RG, RH move the cell 2 toward the jigs RE, RF so that the edge E12 of the cell 2 comes into contact with the jigs RE, RF, thereby positioning the cell 2 relative to the current collector 3 in the second direction.

[0165] Next, again, movable member 103A is positioned at the first separation position, movable member 103B is positioned at the second separation position, movable member 103C is positioned at the third separation position, movable member 103D is positioned at the fourth separation position, movable member 105A is positioned at the fifth separation position, and movable member 105B is positioned at the sixth separation position, and negative electrode collector 3B is placed on top of the first cell 2A.

[0166] Next, similarly to the positive electrode collector 3A described above, the movable member 105A is moved from the fifth separated position to the fifth close position to position the negative electrode collector 3B on the support table 102 in the first direction, and the movable member 105B is moved from the sixth separated position to the sixth close position to position the negative electrode collector 3B on the support table 102 in the second direction.

[0167] Next, the movable member 103A is moved from the first separated position to the first close position, and the jig RA is placed in the notch 34A and the jig RB is placed in the notch 34B, as shown in Fig. 8B. In addition, the movable member 103C is moved from the third separated position to the third close position, and the jig RE is placed in the notch 34E and the jig RF is placed in the notch 34F. Thereafter, the second cell 2B is stacked on the negative electrode current collector 3B.

[0168] Next, the movable member 103B is moved from the second separated position to the second close position, and the second cell 2B is positioned with respect to the negative electrode current collector 3B in the first direction, as shown in FIG. 9A.

[0169] Next, the movable member 103D is moved from the fourth separated position to the fourth close position, and the second cell 2B is positioned with respect to the negative electrode current collector 3B in the second direction, as shown in FIG. 9B.

[0170] The manufacturing apparatus 10 is used to stack a desired number of cells 2 and current collectors 3 while positioning them, thereby completing the stacking step described above.

[0171] 4. Effects (1) According to the manufacturing method of the all-solid-state battery 1, the cells 2 are dry-formed on the first substrate F1, and the cells 2 are pressed and solidified. Then, the cells 2 and the current collectors 3 are alternately stacked so that one current collector 3 is disposed between two cells 2.

[0172] 5A to 6A, the positive electrode layer 21, the solid electrolyte layer 23, and the negative electrode layer 22 are formed in this order on the first substrate F1 by electrostatic screen printing. In this way, the cell 2 is formed on the first substrate F1 by a dry process (cell formation process).

[0173] 6B, a second base material F2 is laminated on the cell 2, and the resulting laminate L is pressed, thereby solidifying the cell 2 (pressing step).

[0174] Next, as shown in FIG. 6C, at least one of the first substrate F1 and the second substrate F2 is peeled off from the cell 2 (peeling step).

[0175] Thereafter, as shown in FIG. 1B, the cells 2 and the current collectors 3 are alternately stacked so that one current collector 3 is disposed between two cells 2 (stacking step).

[0176] In this way, an all-solid-state battery 1 having the cell 2 manufactured by the dry process and being of a bi-cell type can be manufactured.

[0177] Therefore, in the obtained all-solid-state battery 1, compared to an all-solid-state battery having a cell manufactured by a wet method, the decrease in power generation efficiency caused by voids generated in the cell when the solvent evaporates and resins such as binders is suppressed. In addition, the obtained all-solid-state battery 1 is of a bi-cell type, and thus the volume and weight are reduced.

[0178] As a result, the method for manufacturing the all-solid-state battery 1 can improve the energy density of the manufactured all-solid-state battery 1.

[0179] (2) According to the manufacturing method of the all-solid-state battery 1, as shown in FIG. 8B, the lamination process includes a first step of laminating a current collector 3 on a first cell 2A, and a second step of laminating a second cell 2B on the current collector 3 following the first step.

[0180] In FIG. 8B , the second cell 2B is stacked on top of the negative electrode collector 3B, i.e., the second cell 2B is stacked on top of the current collector 3 which is in contact with the negative electrode layer 22 of the first cell 2A, so that the second cell 2B is stacked on top of the current collector 3 such that the negative electrode layer 22 of the second cell 2B is in contact with the current collector 3.

[0181] When the second cell 2B is laminated on the positive electrode current collector 3A, the second cell 2B is laminated on the current collector 3 so that the positive electrode layer 21 of the second cell 2B contacts the current collector 3.

[0182] In this way, a bi-cell type all-solid-state battery 1 in which the first cell 2A and the second cell 2B are in contact with one current collector 3 can be manufactured.

[0183] (3) According to the method for producing the all-solid-state battery 1, as shown in Figures 3A and 3B, the current collector 3 has a conductor 31 and an insulating member 32 laminated on the periphery of the conductor 31. As shown in Figure 8A, in the lamination step, the cell 2 is laminated on the conductor 31, and the insulating member 32 is disposed around the cell 2.

[0184] Since the current collector 3 in which the insulating member 32 is laminated on the periphery of the conductor 31 is used, the all-solid-state battery 1 can be manufactured by a simple process of alternately laminating the cells 2 and the current collectors 3.

[0185] (4) According to the manufacturing method of the all-solid-state battery 1, as shown in FIG. 3B, the insulating member 32 is laminated on one surface S1 of the conductor 31, and the current collector 3 has an adhesive layer 33 laminated on the other surface S2 of the conductor 31.

[0186] Therefore, when a cell 2 is stacked on one current collector 3 and then another current collector 3 is stacked on the cell 2, the adhesive layer 33 of the other current collector 3 can be adhered to the insulating member 32 of the first current collector 3.

[0187] Specifically, as shown in FIG. 1B, when a cell 2 is stacked on a positive electrode current collector 3A (one current collector 3) and a negative electrode current collector 3B (another current collector 3) is stacked on the cell 2, the adhesive layer 33 of the negative electrode current collector 3B can be adhered to the insulating member 32 of the positive electrode current collector 3A.

[0188] This makes it possible to prevent a short circuit between one current collector 3 and another current collector 3.

[0189] (5) According to the manufacturing method of the all-solid-state battery 1, as shown in FIG. 3A , the current collector 3 has notches 34A and 34B cut from the edge E1 of the conductor 31 to the inside of the insulating member 32, and notches 34E and 34F cut from the edge E3 of the conductor 31 to the inside of the insulating member 32.

[0190] Then, in the stacking process, as shown in Figures 7A and 7B, a jig RA is placed in the notch 34A, and a jig RB is placed in the notch 34B, and the cell 2 is positioned relative to the current collector 3 in the first direction so that the edge E11 of the cell 2 contacts the jigs RA and RB.

[0191] Also, as shown in Figures 7B and 8A, a jig RE is placed in the notch 34E, and a jig RF is placed in the notch 34F, and the cell 2 is positioned relative to the current collector 3 in the second direction so that the edge E12 of the cell 2 contacts the jigs RE and RF.

[0192] This makes it possible to easily stack the cells 2 and the current collectors 3 while preventing the positions of the cells 2 from shifting relative to the current collectors 3.

[0193] (6) In the all-solid-state battery 1, as shown in Fig. 1B, the cells 2 and the current collectors 3 are alternately stacked so that one current collector 3 is disposed between two cells 2. In other words, the all-solid-state battery 1 has a bi-cell type stacked structure.

[0194] Therefore, the energy density can be improved.

[0195] The current collector 3 also has a conductor 31 and an insulating member 32 laminated on the periphery of the conductor 31 .

[0196] Therefore, by a simple process of alternately stacking the cells 2 and the current collectors 3, the all-solid-state battery 1 can be manufactured while suppressing short circuits between the conductors 31.

[0197] (7) In the all-solid-state battery 1, the current collector 3 has notches 34A to 34H cut out from the edges E1 to E4 of the conductor 31 to the inside of the insulating member 32, as shown in FIG. 3A.

[0198] Therefore, as shown in FIGS. 7A to 8A, by utilizing the cutouts 34A to 34H, the cells 2 and the current collectors 3 can be easily stacked while preventing the positions of the cells 2 from shifting relative to the current collectors 3.

[0199] 3A, a part of the insulating member 32 is cut out, thereby reducing the amount of the insulating member 32 used. Therefore, deterioration of the cell 2 caused by moisture in the insulating member 32 can be suppressed.

[0200] 5. Variations In the following, modified examples will be described. In the modified examples, the same members as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0201] In the embodiment described above, both the first substrate F1 and the second substrate F2 are peeled off from the cell 2 in the peeling step (see FIG. 6C).

[0202] In contrast, in the modified example, only one of the first substrate F1 and the second substrate F2 is peeled off from the cell 2. In the modified example, the material of the substrate that is not peeled off from the cell 2 is limited to a material having electrical conductivity. An example of the material having electrical conductivity is metal foil, and an example of the metal foil is aluminum foil.

[0203] For example, when only the substrate (second substrate F2) in contact with the negative electrode layer 22 is peeled off from the cell 2, a laminate L1 (see FIG. 16A) having the cell 2 and the substrate (first substrate F1) in contact with the positive electrode layer 21 is obtained.

[0204] When only the laminate L1 is produced in the peeling step, the laminate L1 and the current collector 3 are alternately laminated in the lamination step as shown in Fig. 16A. In this case, the first substrate F1 of the laminate L1 comes into contact with the positive electrode current collector 3A.

[0205] Furthermore, when only the substrate (first substrate F1) in contact with the positive electrode layer 21 is peeled off from the cell 2, a laminate L2 (see FIG. 16B) having the cell 2 and the substrate (second substrate F2) in contact with the negative electrode layer 22 is obtained.

[0206] When only the laminate L2 is produced in the peeling step, the laminate L2 and the current collector 3 are alternately laminated in the laminating step. In this case, the second substrate F2 of the laminate L2 comes into contact with the negative electrode current collector 3B.

[0207] Furthermore, when the laminate L1 and the laminate L2 are produced in the peeling process, the laminate L1, the laminate L2, and the current collector 3 are laminated so that the first substrate F1 of the laminate L1 contacts the positive electrode current collector 3A and the second substrate F2 of the laminate L2 contacts the negative electrode current collector 3B, as shown in FIG. 16B.

[0208] Even in this modified example, the same effects as those of the above-described embodiment can be obtained.

[0209] Moreover, in this modified example, the cell 2 can be supported by the substrate (the first substrate F1 or the second substrate F2) that has not been peeled off from the cell 2. Therefore, it is possible to prevent the cell 2 from collapsing. [Explanation of symbols]

[0210] 1 All-solid-state battery 2 Cell 2A 1st cell 2B Second cell 21 Positive electrode layer 22 Negative electrode layer 23 Solid electrolyte layer 3 Current collector 31 Conductors 32 Insulating materials 33 Adhesive layer 34A Notch E1 Edge of conductor E11 Cell Edge F1 1st base material F2 2nd base material RA Jig S1 One side of the conductor S2 Other side of conductor

Claims

1. a cell forming step of dry-forming a cell on a first substrate, the cell having a positive electrode layer made of a powder containing a positive electrode active material, a negative electrode layer made of a powder containing a negative electrode active material, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer and made of a powder of a solid electrolyte; a pressing step of laminating a second substrate on the cells and pressing the resulting laminate; a peeling step of peeling off at least one of the first substrate and the second substrate from the cell; a lamination step of alternately laminating the cells and the current collectors so that one current collector is disposed between two of the cells; A method for producing an all-solid-state battery, comprising:

2. The lamination step includes: a first step of laminating the current collector on a first cell; Following the first step, a second step of stacking a second cell on the current collector is performed. Including, In the second step, stacking the second cell on top of the current collector such that when the negative electrode layer of the first cell is in contact with the current collector, the negative electrode layer of the second cell is in contact with the current collector; 2. The method for producing an all-solid-state battery according to claim 1, wherein the second cell is stacked on the current collector such that, when the positive electrode layer of the first cell is in contact with the current collector, the positive electrode layer of the second cell is in contact with the current collector.

3. The current collector is Conductor and an insulating member laminated on a peripheral edge of the conductor; having 2. The method for producing an all-solid-state battery according to claim 1, wherein in the stacking step, the cells are stacked on the conductor, and the insulating member is disposed around the cells.

4. the insulating member is laminated on one surface of the conductor, The current collector is The method for producing an all-solid-state battery according to claim 3 , further comprising: an adhesive layer laminated on the other surface of the conductor in a peripheral portion of the conductor.

5. the current collector has a notch cut from an edge of the conductor to an inside of the insulating member, The method for producing an all-solid-state battery according to claim 3 , wherein in the stacking step, a jig is placed in the notch, and the cell is positioned with respect to the current collector so that an edge of the cell contacts the jig.

6. a plurality of cells each having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; Multiple current collectors and Equipped with the cells and the current collectors are alternately stacked such that one current collector is disposed between two of the cells; The current collector is an electrical conductor in contact with the cell; an insulating member laminated on a peripheral edge of the conductor; An all-solid-state battery having the above structure.

7. The all-solid-state battery according to claim 6 , wherein the current collector has a notch cut from an edge of the conductor to an inside of the insulating member.

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