Solid-state battery unit, solid-state battery stack, solid-state battery pack, method for manufacturing solid-state battery unit, and method for manufacturing solid-state battery stack

Abstract

To provide a solid-state battery unit, a solid-state battery stack, a solid-state battery pack, a method for manufacturing a solid-state battery unit, and a method for manufacturing a solid-state battery stack in which improvement and thinning of a battery capacitance can be achieved, and furthermore current collection resistance can be reduced.SOLUTION: A solid-state battery unit 1 comprises: an electrode sheet 10 equipped with an electrolyte layer 101, a positive electrode layer 102, and a negative electrode layer 103; a positive electrode current collector plate 11 which contacts a positive electrode layer 102 of the electrode sheet 10; a negative electrode current collector plate 12 which contacts a negative electrode layer 103 of the electrode sheet 10; and an insulation member 13 which insulates the electrode sheet 10. A plurality of the electrode sheets 10 is arranged on the same plane so as not to overlap with each other, the positive electrode current collector plate 11 is arranged on one side of the plurality of electrode sheets 10, the negative electrode current collector plate 12 is arranged on the other side of the plurality of electrode sheets 10, and the insulation member 13 is arranged on the same plane between adjacent ones of the plurality of electrode sheets 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solid-state battery unit, a solid-state battery stack, a solid-state battery pack, a method for manufacturing a solid-state battery unit, and a method for manufacturing a solid-state battery stack. [Background technology]

[0002] In recent years, a solid-state battery using a lithium ion conductive solid electrolyte has become known. This solid-state battery includes a unit cell part in which a solid electrolyte layer is disposed between a positive electrode layer and a negative electrode layer, a positive electrode current collector disposed on the opposite side of the solid electrolyte layer with respect to the positive electrode layer, and a negative electrode current collector disposed on the opposite side of the solid electrolyte layer with respect to the negative electrode layer.

[0003] In order to improve the battery capacity of such solid-state batteries, it has been proposed to repeatedly stack positive electrode current collectors and negative electrode current collectors with the above-mentioned unit battery parts sandwiched therebetween (see, for example, Patent Document 1).

[0004] On the other hand, solid-state batteries are required to be thin because they are enclosed in a laminate film, etc. However, the solid-state battery of Patent Document 1 has a problem in that it is difficult to make it thin because the number of layers needs to be increased to ensure sufficient electric capacity.

[0005] In view of this, it has been proposed to connect a plurality of positive and negative current collectors in a spiral staircase shape and place a unit battery unit between the positive and negative current collectors (see, for example, Patent Document 2). The solid-state battery of Patent Document 2 can be made thinner while improving the electrical capacity because a plurality of unit battery units can be placed in parallel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2005-251417 A [Patent Document 2] JP 2010-3654 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the solid-state battery of Patent Document 2 has a positive electrode current collector and a negative electrode current collector that are connected in a spiral staircase shape, so the length of the positive electrode current collector and the negative electrode current collector is long, which increases the current collection resistance and ultimately leads to battery deterioration.

[0008] The present invention aims to provide a solid-state battery unit, a solid-state battery stack, a solid-state battery pack, a method for manufacturing a solid-state battery unit, and a method for manufacturing a solid-state battery stack, which are capable of improving the battery capacity and reducing the thickness, and further capable of reducing the current collection resistance. [Means for solving the problem]

[0009] The present invention [1] includes a solid-state battery unit comprising: an electrode sheet including an electrolyte layer, a positive electrode layer disposed on one side of the electrolyte layer, and a negative electrode layer disposed on the other side of the electrolyte layer; a positive electrode current collector in contact with the positive electrode layer of the electrode sheet, a negative electrode current collector in contact with the negative electrode layer of the electrode sheet, and an insulating member that insulates the electrode sheet, wherein a plurality of the electrode sheets are arranged on the same plane so as not to overlap each other, the positive electrode current collector is arranged on one side of the plurality of electrode sheets, the negative electrode current collector is arranged on the other side of the plurality of electrode sheets, and the insulating member is arranged between the plurality of electrode sheets adjacent to each other on the same plane.

[0010] According to this solid-state battery unit, a plurality of electrode sheets are arranged on the same plane so as not to overlap each other. This allows the battery capacity to be improved and the battery to be made thinner. In addition, the positive electrode current collector is arranged on one side of the plurality of electrode sheets, and the negative electrode current collector is arranged on the other side of the plurality of electrode sheets. This allows the positive electrode current collector and the negative electrode current collector to be short in length, thereby reducing the current collection resistance.

[0011] The present invention [2] includes the solid-state battery unit according to [1], wherein the positive current collector plate includes a positive current collector body overlapping with the positive electrode layer and a positive current collector tab protruding from an edge of the positive current collector body, and the negative current collector plate includes a negative current collector body overlapping with the negative electrode layer and a negative current collector tab protruding from the edge of the negative current collector body, and the protruding direction of the positive current collector tab is different from the protruding direction of the negative current collector tab.

[0012] According to this solid-state battery unit, the positive electrode current collector plate includes a positive electrode current collector tab, and the negative electrode current collector plate includes a negative electrode current collector tab. Therefore, the number of current collector tabs for the electrode sheet can be reduced, and the energy required for welding the current collector tabs can be reduced. In addition, the protruding direction of the positive electrode current collector tab is different from the protruding direction of the negative electrode current collector tab. Therefore, contact between the positive electrode current collector tab and the negative electrode current collector tab can be suppressed, and a short circuit can be suppressed.

[0013] The present invention [3] includes a solid-state battery stack in which a plurality of solid-state battery units according to [1] or [2] are stacked, the plurality of solid-state battery units are arranged such that the positive electrode current collector plate and the negative electrode current collector plate of the solid-state battery units adjacent to each other in the stacking direction face each other with the electrode sheet interposed therebetween, the intervening electrode sheets are arranged in a plurality of layers on the same plane so as not to overlap each other, the positive electrode layers of the intervening electrode sheets are in contact with the positive electrode current collector plate, the negative electrode layers of the intervening electrode sheets are in contact with the negative electrode current collector plate, and the insulating member is arranged between the plurality of electrode sheets adjacent to each other on the same plane.

[0014] According to this solid-state battery stack, a plurality of the solid-state battery units are stacked. This allows for improved battery capacity and reduced thickness. In addition, the positive and negative current collectors of the solid-state battery units adjacent to each other in the stacking direction are arranged to face each other with the electrode sheet interposed therebetween. This allows for shorter lengths of the positive and negative current collectors, thereby reducing current collection resistance.

[0015] The present invention [4] includes a solid-state battery pack in which the solid-state battery stack according to [3] is enclosed in an exterior body.

[0016] According to this solid-state battery pack, the solid-state battery stack is enclosed in an exterior body. Since the solid-state battery stack is thin, it can be easily enclosed in the exterior body. Therefore, damage to the exterior body can be suppressed, and the reliability of the solid-state battery pack can be improved.

[0017] The present invention [5] includes a method for manufacturing a solid-state battery unit according to [1] or [2], comprising the steps of: preparing one of the positive and negative current collectors; arranging the insulating member on one side of the one current collector; arranging a plurality of the electrode sheets on one side of the one current collector so as not to overlap each other on the same plane, wherein the plurality of electrode sheets are brought into contact with the one current collector so that either one of the positive and negative electrode layers of the electrode sheet has the same polarity as the one current collector; and arranging the other current collector on the plurality of electrode sheets, wherein the other electrode layer of the electrode sheet has the same polarity as the other current collector.

[0018] According to this method for manufacturing a solid-state battery unit, an insulating member is placed on one surface of one current collector plate, and then a plurality of electrode sheets are placed on one surface of one current collector plate on the same plane without overlapping each other. Since the electrode sheets are placed along the insulating member, the electrode sheets can be easily placed, and further, short circuits caused by contact between the electrode sheets can be suppressed.

[0019] The present invention [6] includes the method for producing the solid-state battery unit described in [5], further including a step of pressure-molding the electrolyte layer, a positive electrode layer disposed on one side of the electrolyte layer, and a negative electrode layer disposed on the other side of the electrolyte layer to obtain the electrode sheet.

[0020] This method for producing a solid-state battery unit further includes a step of pressure-molding an electrolyte layer, a positive electrode layer disposed on one side of the electrolyte layer, and a negative electrode layer disposed on the other side of the electrolyte layer to obtain an electrode sheet, which improves the handleability of the electrode sheet and makes it possible to easily produce a solid-state battery unit.

[0021] The present invention [7] is a method for manufacturing a solid-state battery stack according to [3], comprising the steps of: preparing one of the solid-state battery units; arranging the insulating member on one side of the one of the solid-state battery units; arranging the plurality of electrode sheets on one side of the one of the solid-state battery units so as not to overlap each other on the same plane, wherein either one of the positive electrode layer and the negative electrode layer of the electrode sheet has the same polarity as either one of the positive electrode current collector plate and the negative electrode current collector plate forming one side of the one of the solid-state battery units; and contacting the other of the solid-state battery units with the plurality of electrode sheets, wherein either one of the positive electrode current collector plate and the negative electrode current collector plate forming the other side of the other of the solid-state battery units has the same polarity as the other electrode layer of the electrode sheet.

[0022] According to this method for manufacturing a solid-state battery stack, a plurality of the solid-state battery units can be arranged with an insulating member and an electrode sheet sandwiched therebetween, so that the solid-state battery stack can be easily manufactured.

[0023] The present invention [8] includes the method for producing a solid-state battery stack according to [7], further comprising a step of pressure-molding the electrolyte layer, a positive electrode layer disposed on one side of the electrolyte layer, and a negative electrode layer disposed on the other side of the electrolyte layer to obtain the electrode sheet.

[0024] This method for producing a solid-state battery stack further includes a step of obtaining an electrode sheet by pressure-molding an electrolyte layer, a positive electrode layer disposed on one side of the electrolyte layer, and a negative electrode layer disposed on the other side of the electrolyte layer, which improves the handleability of the electrode sheet and makes it possible to easily produce a solid-state battery stack. Effect of the Invention

[0025] The solid-state battery unit of the present invention can improve the battery capacity and reduce the thickness, and further can reduce the current collection resistance.

[0026] The solid-state battery stack of the present invention can improve the battery capacity and reduce the thickness, and further can reduce the current collection resistance.

[0027] The solid-state battery pack of the present invention can achieve improved reliability.

[0028] The method for producing a solid-state battery unit of the present invention can easily produce the above-mentioned solid-state battery unit.

[0029] The method for producing a solid-state battery stack of the present invention can easily produce the above-mentioned solid-state battery stack. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view of one embodiment of a solid-state battery unit of the present invention. [Diagram 2] 2A to 2C show one embodiment of a method for producing an electrode sheet. Fig. 2A shows a step of forming a positive electrode layer. Fig. 2B shows a step of forming a solid electrolyte layer on one side of the positive electrode layer. Fig. 2C shows a step of forming a negative electrode layer on one side of the solid electrolyte layer. [Diagram 3]3A to 3D show one embodiment of a method for manufacturing a solid-state battery unit of the present invention. Fig. 3A shows a step of preparing a negative electrode current collector. Fig. 3B shows a step of arranging an insulating member on one surface of the negative electrode current collector. Fig. 3C shows a step of arranging four electrode sheets on one surface of the negative electrode current collector so as not to overlap each other on the same plane. Fig. 3D shows a step of arranging a positive electrode current collector on one surface of the four electrode sheets. [Figure 4] FIG. 4 is a perspective view of one embodiment of a solid-state battery stack of the present invention. [Diagram 5] 5A to 5D show one embodiment of a method for manufacturing a solid-state battery stack according to the present invention. FIG. 5A shows a step of preparing one solid-state battery unit. FIG. 5B shows a step of arranging an insulating member on one surface of one solid-state battery unit. FIG. 5C shows a step of arranging four electrode sheets on one surface of one solid-state battery unit so as not to overlap each other on the same plane. FIG. 5D shows a step of further arranging another solid-state battery unit on the four electrode sheets. [Figure 6] FIG. 6 is a cross-sectional view of one embodiment of a solid-state battery pack of the present invention. [Figure 7] 7A and 7B are perspective views showing the arrangement of electrode sheets in a solid-state battery unit of the present invention, with Fig. 7A being a perspective view showing an arrangement of two electrode sheets, and Fig. 7B being a perspective view showing an arrangement of three electrode sheets. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] 1.Solid-state battery unit With reference to FIG. 1, one embodiment of a solid-state battery unit of the present invention will be described.

[0032] The solid-state battery unit 1 includes an electrode sheet 10, a positive electrode current collector 11, a negative electrode current collector 12, and an insulating member 13. Specifically, as shown in Fig. 1, the solid-state battery unit 1 includes the negative electrode current collector 12, the electrode sheet 10, the insulating member 13, and the positive electrode current collector 11 in this order in the stacking direction.

[0033] <Electrode sheet> The electrode sheet 10 has, for example, a sheet shape (including a film shape).

[0034] The electrode sheet 10 has, for example, a generally rectangular shape in plan view.

[0035] The length of one side of the electrode sheet 10 in the planar direction X (the X direction is a direction along two parallel sides of the electrode sheet 10) is not particularly limited, but is, for example, equal to or less than the length of one side of the positive current collector plate body 110 and the negative current collector plate body 120 in the planar direction X, which will be described later. Specifically, the length of one side of the electrode sheet 10 in the planar direction X is approximately half the length of one side of the positive current collector plate body 110 and the negative current collector plate body 120 in the planar direction X, which will be described later.

[0036] The length of one side of the electrode sheet 10 in the planar direction Y (the Y direction is a direction perpendicular to the X direction) is not particularly limited, but is, for example, equal to or less than the length of one side in the planar direction Y of the positive current collector plate body 110 and the negative current collector plate body 120 described below. Specifically, the length of one side of the electrode sheet 10 in the planar direction Y is approximately half the length of one side in the planar direction Y of the positive current collector plate body 110 and the negative current collector plate body 120 described below.

[0037] The planar area of ​​the electrode sheet 10 is not particularly limited, but is, for example, smaller than the planar areas of the positive current collector plate body 110 and the negative current collector plate body 120 described below. Specifically, the planar area of ​​the electrode sheet 10 is approximately ¼ of the planar areas of the positive current collector plate body 110 and the negative current collector plate body 120 described below.

[0038] The thickness of the electrode sheet 10 is, for example, 100 μm or more, preferably 200 μm or more, and for example, 1000 μm or less, preferably 800 μm or less.

[0039] The electrode sheet 10 includes an electrolyte layer 101 , a positive electrode layer 102 disposed on one side of the electrolyte layer 101 , and a negative electrode layer 103 disposed on the other side of the electrolyte layer 101 .

[0040] [Electrolyte layer] The electrolyte layer 101 is formed of, for example, a material containing a solid electrolyte. Furthermore, the electrolyte layer 101 may contain materials such as a binder that are commonly used in the field of batteries, as necessary.

[0041] The solid electrolyte is not particularly limited as long as it exhibits lithium ion conductivity, and examples thereof include organic solid electrolytes and inorganic solid electrolytes, and preferably, inorganic solid electrolytes are used.

[0042] The solid electrolytes can be used alone or in combination of two or more kinds.

[0043] Examples of inorganic solid electrolytes include sulfides, oxides, nitrides, and hydrides, and preferably, sulfides.

[0044] 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.

[0045] The elements of Groups 13, 14 and 15 of the periodic table are not particularly limited, but include, for example, P, Si, Ge, As, Sb and Al, preferably P, Si and Ge, and more preferably P.

[0046] Specifically, examples of sulfides include 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).

[0047] The thickness of the electrolyte layer 101 is, for example, 10 μm or more, preferably 30 μm or more, and for example, 300 μm or less, preferably 100 μm or less.

[0048] [Positive electrode layer] The positive electrode layer 102 may be formed, for example, from a material consisting of only a positive electrode active material, or may be formed from a material containing a positive electrode active material and a solid electrolyte. The positive electrode layer 102 is preferably formed from a material containing a positive electrode active material and a solid electrolyte. In addition, the positive electrode layer 102 may contain materials such as a binder that are commonly used in the field of batteries, as necessary.

[0049] The positive electrode active material is not particularly limited as long as it is a material capable of inserting and extracting lithium ions. For example, 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 Examples of the oxide include lithium oxides such as lithium ion-excess oxide (Li2MnO3-LiMO2), lithium manganate (lithium spinel manganate (LiMn2O4)), and Li-excess composite oxide (Li2MnO3-LiMO2). Examples of the oxides include olivine compounds (LiMPO4) and sulfur-containing compounds (Li2S). In the above formula, M represents a transition metal. 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.

[0050] The positive electrode active materials can be used alone or in combination of two or more kinds.

[0051] In addition, from the viewpoint of improving rate characteristics, the surface of the positive electrode active material may be covered with a coating material.

[0052] The coating material is, for example, Li4Ti5O 12, LiTaO3, Li4NbO3, LiAlO2, Li2ZrO3, Li2WO4, Li2TiO3, Li2B4O7, Li3PO4, Li2MoO4, LiBO2, alumina (Al2O3), and carbon (C).

[0053] The solid electrolyte contained in the positive electrode layer 102 may be, for example, the same as the solid electrolyte contained in the electrolyte layer 101. Specifically, the solid electrolyte may be, for example, an organic solid electrolyte or an inorganic solid electrolyte.

[0054] The ratio of the positive electrode active material to the solid electrolyte in the positive electrode layer 102 is not particularly limited.

[0055] The thickness of the positive electrode layer 102 is, for example, 50 μm or more, preferably 100 μm or more, and for example, 500 μm or less, preferably 300 μm or less.

[0056] [Negative electrode layer] The negative electrode layer 103 is disposed on the other surface of the electrolyte layer 101 .

[0057] The negative electrode layer 103 may be formed, for example, from a material consisting of only a negative electrode active material, or may be formed from a material containing a negative electrode active material and a solid electrolyte. The negative electrode layer 103 is preferably formed from a material containing a negative electrode active material and a solid electrolyte. Furthermore, the negative electrode layer 103 may contain materials such as a binder that are commonly used in the field of batteries, as necessary.

[0058] The negative electrode active material is not particularly limited as long as it is a material capable of inserting and extracting lithium ions, and examples thereof include carbon materials, simple metals and semimetals, metal alloys, and metal or semimetal compounds.

[0059] Examples of carbon materials include graphite (natural graphite, artificial graphite), hard carbon, and amorphous carbon. Examples of metal and semimetal elements and metal alloys include lithium metal and its alloys, and simple silicon. Examples of metal or semimetal compounds include oxides, sulfides, nitrides, hydrates, and silicides (lithium silicides) of metals or semimetals, and examples of metal or semimetal oxides include titanium oxide and silicon oxide.

[0060] 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.

[0061] The solid electrolyte contained in the negative electrode layer 103 may be, for example, the same as the solid electrolyte contained in the electrolyte layer 101. Specifically, the solid electrolyte is not particularly limited as long as it exhibits lithium ion conductivity, and examples of the solid electrolyte include organic solid electrolytes and inorganic solid electrolytes.

[0062] In the negative electrode layer 103, the ratio of the negative electrode active material to the solid electrolyte is not particularly limited.

[0063] The thickness of the negative electrode layer 103 is, for example, 50 μm or more, preferably 100 μm or more, and for example, 500 μm or less, preferably 300 μm or less.

[0064] <Manufacturing method of electrode sheet> With reference to FIG. 2, one embodiment of a method for producing the electrode sheet 10 will be described.

[0065] A manufacturing method of the electrode sheet 10 includes, for example, a film formation process of forming the positive electrode layer 102, the electrolyte layer 101, and the negative electrode layer 103, and a pressure molding process of pressure molding the formed positive electrode layer 102, the electrolyte layer 101, and the negative electrode layer 103.

[0066] (Film forming process) In the film formation step, the positive electrode layer 102, the electrolyte layer 101, and the negative electrode layer 103 are formed. Specifically, a metal foil (not shown) is disposed, the positive electrode layer 102 is formed on one side of the metal foil, the electrolyte layer 101 is formed on the opposite side of the metal foil from the positive electrode layer 102, the negative electrode layer 103 is formed on the opposite side of the electrolyte layer 101 from the positive electrode layer 102, and a metal foil (not shown) is further disposed on the opposite side of the electrolyte layer 101 from the negative electrode layer 103.

[0067] In the above-described film formation process, the positive electrode layer 102, the electrolyte layer 101, and the negative electrode layer 103 are formed in this order, but the negative electrode layer 103, the electrolyte layer 101, and the positive electrode layer 102 may be formed in this order.

[0068] The metal foil on which the positive electrode layer 102 is laminated may be the same as that of the positive electrode current collector 11 described later, and the metal foil on which the negative electrode layer 103 is laminated may be the same as that of the negative electrode current collector 12 described later.

[0069] The positive electrode layer 102, the electrolyte layer 101, and the negative electrode layer 103 are formed by, for example, a dry process. That is, the positive electrode layer 102, the electrolyte layer 101, and the negative electrode layer 103 are formed using, for example, the above-mentioned materials that do not contain a liquid component.

[0070] Dry process film formation methods include, for example, electrostatic spraying, squeegee film formation, and electrostatic painting.

[0071] (Pressure molding process) The laminated layers and metal foils are pressure-molded (main press). That is, the electrolyte layer 101, the positive electrode layer 102 disposed on one side of the electrolyte layer 101, and the negative electrode layer 103 disposed on the other side of the electrolyte layer 101 are pressure-molded to obtain the electrode sheet 10.

[0072] The pressure for the pressure molding may be appropriately changed depending on the material and thickness of each layer, and is, for example, 50 MPa or more, preferably 300 MPa or more, and for example, 5000 MPa or less, preferably 3000 MPa or less.

[0073] Furthermore, the manufacturing method of the electrode sheet 10 may include a temporary pressing step, a metal foil removing step, and a cutting step, as necessary.

[0074] The provisional pressing step is a step of preliminarily pressing at any stage after forming the positive electrode layer 102, after forming the electrolyte layer 101, after forming the negative electrode layer 103, or before pressure molding (main pressing). The provisional pressing step may be performed at multiple stages as described above.

[0075] The pressure of the preliminary press is usually lower than the pressure of the pressure molding (main press), and is, for example, 1 MPa or more and, for example, 10 MPa or less.

[0076] The metal foil removing step is a step of removing the metal foil at a stage, for example, before pressure molding (main press) or after pressure molding (main press).

[0077] The cutting step is, for example, a step of cutting out an excess portion of the electrode sheet 10 after pressure molding (main press). By the cutting step, the length of one side of the electrode sheet 10 in the planar direction X direction and the planar direction Y direction can be adjusted.

[0078] The electrode sheet 10 obtained in this manner has excellent handleability, and allows the solid-state battery unit 1 and solid-state battery stack 2, which will be described later, to be manufactured easily.

[0079] <Electrode sheet placement> A plurality of electrode sheets 10 are arranged on the same plane so as not to overlap each other. Specifically, the plurality of electrode sheets 10 are aligned in the plane direction X direction and the plane direction Y direction, and more specifically, a total of four electrode sheets 10 are arranged on the same plane so as not to overlap each other, two in the plane direction X direction and two in the plane direction Y direction (the Y direction is perpendicular to the X direction). Note that an insulating member 13 described later is arranged between adjacent electrode sheets 10, and it is preferable that the electrode sheets 10 contact the insulating member 13.

[0080] As described above, since a plurality of electrode sheets 10 are arranged on the same plane, the solid-state battery unit can be made thinner, and further, the battery capacity can be improved.

[0081] <Positive current collector plate> The positive electrode current collector 11 is disposed on one side of the multiple electrode sheets 10 arranged on the same plane, and is in contact with the positive electrode layer 102 of each electrode sheet 10. The positive electrode current collector 11 preferably contacts the entire surface of the positive electrode layer 102 of each electrode sheet 10. Furthermore, one positive electrode current collector 11 is disposed for each of the multiple electrode sheets 10.

[0082] The positive current collector plate 11 includes a positive current collector plate body 110 and a positive current collector tab 111 .

[0083] [Positive current collector body] The positive electrode current collector body 110 has, for example, a sheet shape (including a film shape, a thin plate shape, and a foil shape).

[0084] The positive electrode current collector body 110 has, for example, a generally rectangular shape in plan view.

[0085] The positive current collector body 110 overlaps, for example, the positive electrode layers 102 of the electrode sheets 10. Specifically, the positive current collector body 110 overlaps all of the positive electrode layers 102 of the four electrode sheets 10 arranged on the same plane.

[0086] The length of one side of the positive current collector plate body 110 in the surface direction X is not particularly limited, but is, for example, equal to or greater than the total length in the surface direction X of a plurality of electrode sheets 10 arranged on the same plane. Specifically, the length of one side of the positive current collector plate body 110 in the surface direction X is, for example, approximately twice the length of one electrode sheet 10 in the surface direction X.

[0087] The length of one side of the positive current collector plate body 110 in the plane direction Y is not particularly limited, but is, for example, equal to or greater than the total length in the plane direction Y of a plurality of electrode sheets 10 arranged on the same plane. Specifically, the length of one side of the positive current collector plate body 110 in the plane direction Y is, for example, approximately twice the length in the plane direction Y of one electrode sheet 10.

[0088] The length of one side of the plane of the positive current collector plate main body 110 can be adjusted by the number of electrode sheets 10 arranged on the same plane, preventing the side from becoming excessively long, and ultimately reducing the current collection resistance.

[0089] The planar area of ​​the positive current collector body 110 is not particularly limited, but is, for example, larger than the total planar area of ​​the multiple electrode sheets 10 arranged on the same plane, and more preferably is equal to or larger than the total planar area of ​​the multiple electrode sheets 10 arranged on the same plane and the planar area of ​​an insulating member 13, which will be described later, arranged between adjacent multiple electrode sheets 10. Specifically, the planar area of ​​the positive current collector body 110 is, for example, about four times the planar area of ​​one electrode sheet 10.

[0090] The positive current collector body 110 has a thickness of, for example, 1 μm or more, preferably 5 μm or more, and for example, 100 μm or less, preferably 50 μm or less.

[0091] Examples of materials for the positive electrode collector body 110 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.

[0092] The positive current collector plate body 110 is preferably one that has had its surface roughened in order to improve adhesion with the electrode sheet 10. The roughening treatment is a treatment for increasing the surface roughness by etching or the like.

[0093] [Positive electrode current collecting tab] The positive current collector tab 111 protrudes, for example, from an edge of the positive current collector plate body 110. Specifically, the positive current collector tab 111 protrudes from one side of the positive current collector plate body 110 between the center and an end of the side in a direction perpendicular to the side.

[0094] In this manner, one positive current collecting tab 111 protrudes from the edge of one positive current collecting plate body 110. This makes it possible to reduce the number of current collecting tabs for the electrode sheet 10, and thus reduces the energy required to weld the current collecting tabs.

[0095] The positive current collector tab 111 may be formed in a tab shape by a part of the edge of the positive current collector plate body 110 protruding, or the positive current collector tab 111 may be separately joined to the edge of the positive current collector plate body 110. The positive current collector tab 111 is preferably formed in a tab shape by a part of the edge of the positive current collector plate body 110 protruding. In other words, it is preferable that the positive current collector tab 111 and the positive current collector plate body 110 are continuous.

[0096] The positive electrode current collector tab 111 has, for example, a generally rectangular shape in a plan view.

[0097] The thickness of the positive current collector tab 111 is the same as the thickness of the positive current collector plate body 110 , and the material of the positive current collector tab 111 is the same as the material of the positive current collector plate body 110 .

[0098] <Negative electrode current collector plate> The negative electrode current collector 12 is disposed on the other side of the multiple electrode sheets 10 arranged on the same plane, and is in contact with the negative electrode layer 103 of each electrode sheet 10. The negative electrode current collector 12 preferably contacts the entire surface of the negative electrode layer 103 of each electrode sheet 10. Furthermore, one negative electrode current collector 12 is disposed for each of the multiple electrode sheets 10.

[0099] The negative current collector plate 12 also includes a negative current collector plate body 120 and a negative current collector tab 121 .

[0100] [Negative current collector body] The negative electrode current collector body 120 has, for example, a sheet shape (including a film shape, a thin plate shape, and a foil shape).

[0101] The negative electrode current collector body 120 has, for example, a generally rectangular shape in plan view.

[0102] The negative electrode current collector plate body 120 overlaps, for example, the negative electrode layer 103 of the electrode sheet 10. Specifically, it overlaps all of the negative electrode layers 103 of the four electrode sheets 10 arranged on the same plane.

[0103] The length of one side in the surface direction X, the length of one side in the surface direction Y, the area in a plane, the thickness, and the material of the negative current collector body 120 are, for example, the same as those of the positive current collector body 110 described above.

[0104] [Negative electrode current collecting tab] The negative electrode current collector tab 121 protrudes, for example, from an edge of the negative electrode current collector plate body 120. Specifically, the negative electrode current collector tab 121 protrudes from one side of the negative electrode current collector plate body 120 between the center and an end of the side in a direction perpendicular to the side.

[0105] In this manner, one negative electrode current collecting tab 121 protrudes from the edge of one negative electrode current collecting plate body 120. This makes it possible to reduce the number of current collecting tabs for the electrode sheet 10, and thus reduces the energy required to weld the current collecting tabs.

[0106] The negative current collector tab 121 may be formed in a tab shape by a part of the edge of the negative current collector plate body 120 protruding, or the negative current collector tab 121 may be separately joined to the edge of the negative current collector plate body 120. The negative current collector tab 121 is preferably formed in a tab shape by a part of the edge of the negative current collector plate body 120 protruding. In other words, it is preferable that the negative current collector tab 121 and the negative current collector plate body 120 are continuous.

[0107] The negative electrode current collecting tab 121 has, for example, a generally rectangular shape in a plan view.

[0108] The thickness of the negative current collector tab 121 is the same as the thickness of the negative current collector plate body 120 , and the material of the negative current collector tab 121 is the same as the material of the negative current collector plate body 120 .

[0109] <Protruding direction of positive and negative electrode current collecting tabs> The protruding direction of the positive current collector tab 111 is different from, for example, the protruding direction of the negative current collector tab 121. The protruding side of the positive current collector tab 111 in the positive current collector plate body 110 may be arranged opposite to the protruding side of the negative current collector tab 121 in the negative current collector plate body 120 in the Y direction, and the protruding side of the positive current collector tab 111 in the positive current collector plate body 110 may be arranged perpendicular to the protruding side of the negative current collector tab 121 in the negative current collector plate body 120 in a plan view.

[0110] 1, each side from which the positive electrode current collector tab 111 and the negative electrode current collector tab 121 protrude extends in the X direction, and the positive electrode current collector tab 111 protrudes from the side in one direction in the Y direction, while the negative electrode current collector tab 121 protrudes from the side in the other direction in the Y direction. Although not shown, the side from which either the positive electrode current collector tab 111 or the negative electrode current collector tab 121 protrudes extends in the X direction, and the side from which the other protrudes extends in the Y direction, and the tabs protruding from the side extending in the X direction protrude from the side in one or the other direction in the Y direction, while the tabs protruding from the side extending in the Y direction protrude from the side in one or the other direction in the X direction.

[0111] If the protruding direction of the positive electrode current collector tab 111 differs from the protruding direction of the negative electrode current collector tab 121, contact between the positive electrode current collector tab 111 and the negative electrode current collector tab 121 can be prevented, thereby preventing a short circuit.

[0112] <Insulating materials> The insulating member 13 is disposed between a plurality of electrode sheets 10 adjacent to each other on the same plane, and insulates the electrode sheets 10. Specifically, the insulating member 13 is preferably disposed between four electrode sheets 10 adjacent to each other on the same plane, and in contact with the electrode sheets 10.

[0113] By arranging the insulating member 13 as described above, it is possible to prevent the electrode sheets 10 from coming into contact with each other and causing a short circuit.

[0114] The shape of the insulating member 13 in a plan view is not particularly limited as long as it is disposed between a plurality of electrode sheets 10 adjacent to each other on the same plane, and differs depending on the arrangement of the electrode sheets 10. Specifically, the shape of the insulating member 13 in a plan view is, for example, a generally cross shape in a plan view.

[0115] The thickness of the insulating member 13 is not particularly limited as long as it can insulate the electrode sheet 10, and is preferably the same as the thickness of the electrode sheet 10. The thickness of the insulating member 13, compared to the thickness of the electrode sheet 10, is, for example, 100 μm or more, preferably 200 μm or more, and for example, 1000 μm or less, preferably 800 μm or less.

[0116] The material of the insulating member 13 may be, for example, a polymer material.

[0117] An example of the polymeric material is a polyethylene terephthalate (PET) film.

[0118] 3. Manufacturing method of solid-state battery unit With reference to FIG. 3, one embodiment of a method for producing a solid-state battery unit of the present invention will be described.

[0119] A manufacturing method of the solid-state battery unit 1 includes, for example, a step of preparing one of the positive current collector plate 11 and the negative current collector plate 12 (first current collector plate preparation step), a step of arranging an insulating member 13 on one side of one of the current collector plates (insulating member arrangement step), a step of arranging multiple electrode sheets 10 on one side of one of the current collector plates so that they do not overlap each other on the same plane (electrode sheet arrangement step), and a step of arranging the other current collector plate on the multiple electrode sheets 10 (second current collector arrangement step).

[0120] (First current collector plate preparation process) 3A, in the first current collector preparation step, one of the positive current collector plate 11 and the negative current collector plate 12 is prepared. Specifically, in the first current collector preparation step, the negative current collector plate 12 is prepared.

[0121] (Insulating material placement process) 3B, in the insulating member arranging step, an insulating member 13 is arranged on one surface of the current collector plate (one of the current collector plates) prepared in the first current collector plate preparing step. Specifically, in the insulating member arranging step, a substantially cross-shaped insulating member 13 is arranged on one surface of the negative current collector plate 12 prepared in the first current collector plate preparing step. More specifically, in plan view, the substantially cross-shaped insulating member 13 is arranged in the center of one surface of the negative current collector plate 12. As a result, one surface of the negative current collector plate 12 is divided into four sections by the insulating member 13.

[0122] It should be noted that the step of arranging the insulating member can be omitted by using the positive electrode current collector 11 or the negative electrode current collector 12 to which the insulating member 13 has been attached in advance.

[0123] (Electrode sheet placement process) As shown in Fig. 3C, in the electrode sheet arrangement step, a plurality of electrode sheets 10 are arranged on one surface of one current collector plate so as not to overlap each other on the same plane. In addition, the plurality of electrode sheets 10 are brought into contact with one current collector plate so that either the positive electrode layer or the negative electrode layer of the electrode sheet 10 has the same polarity as the one current collector plate. Note that the electrode sheet 10 is preferably also in contact with an insulating member 13.

[0124] Specifically, in the electrode sheet arrangement step, four electrode sheets 10 are arranged on one surface of the negative electrode current collector plate 12 so as not to overlap each other on the same plane. At this time, the negative electrode layers 103 of the four electrode sheets 10 contact the negative electrode current collector plate 12. It is preferable that a part of the side surface of the electrode sheet 10 also contacts the insulating member 13.

[0125] Moreover, the four electrode sheets 10 are arranged one by one in each of four spaces partitioned by the substantially cross-shaped insulating members 13 arranged in the insulating member arrangement step on one surface of the negative electrode current collector plate 12. In other words, the insulating members 13 are arranged between the four electrode sheets 10 adjacent to each other on the same plane.

[0126] (Second current collector plate placement process) 3D, in the second current collector arrangement step, the other current collector is arranged on the multiple electrode sheets arranged in the electrode sheet arrangement step, and the other current collector is brought into contact with the multiple electrode sheets so that the other electrode layer of the electrode sheet has the same polarity as the other current collector.

[0127] Specifically, in the second current collector arrangement step, a positive current collector 11 is arranged on the four electrode sheets 10 arranged in the electrode sheet arrangement step. At this time, the positive current collector 11 comes into contact with the positive electrode layers 102 of the four electrode sheets 10.

[0128] The positive electrode current collector 11 may also be in contact with the substantially cross-shaped insulating member 13 arranged in the insulating member arrangement step.

[0129] The positive current collector plate 11 is arranged such that the protruding direction of the positive current collector tab 111 is opposite to the protruding direction of the negative current collector tab 121 of the negative current collector plate 12.

[0130] In this manner, the solid-state battery unit 1 is manufactured.

[0131] The manufacturing method of the solid-state battery unit 1 described above allows the electrode sheet 10 to be arranged along the insulating member 13, making it possible to easily arrange the electrode sheet 10 and further to prevent short circuits caused by contact between the electrode sheets 10.

[0132] 4.Solid-state battery stack With reference to FIG. 4, one embodiment of a solid-state battery stack of the present invention will be described.

[0133] The solid-state battery stack 2 is formed by stacking a plurality of the above-mentioned solid-state battery units 1. Specifically, the solid-state battery stack 2 includes one solid-state battery unit 1, an electrode sheet 10, an insulating member 13, and another solid-state battery unit 1 in this order in the stacking direction.

[0134] In such a solid-state battery stack, a plurality of the above-described solid-state battery units are stacked, so that it is possible to improve the battery capacity and reduce the thickness.

[0135] The multiple solid-state battery units 1 are arranged such that the positive electrode current collector 11 and the negative electrode current collector 12 of the solid-state battery units 1 adjacent to each other in the stacking direction face each other with the electrode sheet 10 interposed therebetween. Specifically, the positive electrode current collector 11 of one solid-state battery unit 1 and the negative electrode current collector 12 of another solid-state battery unit 1 adjacent to each other in the stacking direction are arranged such that they face each other with the electrode sheet 10 interposed therebetween.

[0136] In the solid-state battery stack 2, the positive electrode current collector 11 and the negative electrode current collector 12 in the solid-state battery units 1 adjacent to each other in the stacking direction are arranged to face each other with the electrode sheet 10 interposed therebetween, so that the lengths of the positive electrode current collector 11 and the negative electrode current collector 12 are short, and the current collection resistance can be reduced.

[0137] The electrode sheet 10 and the insulating member 13 are disposed so as to be interposed between the solid-state battery units 1 adjacent to each other in the stacking direction described above.

[0138] The interposed electrode sheets 10 are arranged in a plurality of layers on the same plane so as not to overlap each other. Specifically, the interposed electrode sheets 10 are aligned in the plane direction X and the plane direction Y. More specifically, four electrode sheets 10 are arranged between the positive electrode current collector 11 and the negative electrode current collector 12 of the solid-state battery units 1 adjacent to each other in the stacking direction, so as not to overlap each other, on the same plane. Note that an insulating member 13 is arranged between the adjacent electrode sheets 10, and the interposed electrode sheets 10 are preferably in contact with the insulating member 13.

[0139] The positive electrode layers 102 of the interposed electrode sheets 10 contact the positive electrode current collector plate 11 of the solid-state battery unit 1. The negative electrode layers 103 of the interposed electrode sheets 10 contact the negative electrode current collector plate 12 of the solid-state battery unit 1. Specifically, the positive electrode layers 102 of the four electrode sheets 10 interposed between the positive electrode current collector plate 11 and the negative electrode current collector plate 12 contact the positive electrode current collector plate 11 of one solid-state battery unit 1, and the negative electrode layers 103 contact the negative electrode current collector plate 12 of the other solid-state battery unit 1.

[0140] The insulating member 13 is disposed between adjacent electrode sheets 10 on the same plane. That is, the insulating member 13 is also interposed between the positive electrode current collector plate 11 and the negative electrode current collector plate 12 in the solid-state battery units 1 adjacent to each other in the stacking direction described above.

[0141] Specifically, the insulating member 13 has a substantially cross shape and is disposed between four electrode sheets 10 adjacent to each other on the same plane.

[0142] The number of stacked solid-state battery units 1 in the solid-state battery stack 2 can be appropriately selected according to the desired battery capacity.

[0143] 5. Manufacturing method of solid-state battery stack With reference to FIG. 5, one embodiment of the method for producing a solid-state battery stack of the present invention will be described.

[0144] The manufacturing method of the solid-state battery stack 2 includes the steps of preparing one solid-state battery unit 1a described above (first solid-state battery unit preparation step), arranging an insulating member 13 on one side of the one solid-state battery unit 1a (intervening insulating member arrangement step), arranging a plurality of electrode sheets 10 on one side of the one solid-state battery unit 1a so as not to overlap each other on the same plane (intervening electrode sheet arrangement step), and further arranging another solid-state battery unit 1b on the plurality of electrode sheets 10 (second solid-state battery unit arrangement step).

[0145] (First solid-state battery unit preparation process) As shown in FIG. 5A, in the first solid-state battery unit preparation step, the above-mentioned one solid-state battery unit 1a is prepared.

[0146] (Intervening insulation member placement process) As shown in Fig. 5B, in the intervening insulating member arranging step, an insulating member 13 is arranged on one surface of one solid-state battery unit 1a. Specifically, in the intervening insulating member arranging step, a substantially cross-shaped insulating member 13 is arranged on the positive current collector 11 forming one surface of one solid-state battery unit 1a. More specifically, in a plan view, the substantially cross-shaped insulating member 13 is arranged in the center of one surface of the positive current collector 11 forming one surface of one solid-state battery unit 1a. As a result, one surface of the positive current collector 11 forming one surface of one solid-state battery unit 1a is divided into four sections by the insulating member 13.

[0147] Furthermore, when another solid-state battery unit 1b is disposed, the insulating member 13 is interposed between the one solid-state battery unit 1a and the other solid-state battery unit 1b.

[0148] In addition, in one solid-state battery unit 1a, by attaching insulating member 13 to positive electrode current collector plate 11 or negative electrode current collector plate 12 in advance, the intervening insulating member arrangement step can be omitted.

[0149] (Interposed electrode sheet placement process) 5C, in the intervening electrode sheet arrangement step, a plurality of electrode sheets 10 are arranged on one surface of one solid-state battery unit 1a so as not to overlap each other on the same plane. In addition, the plurality of electrode sheets 10 are brought into contact with one solid-state battery unit 1a so that either the positive electrode layer or the negative electrode layer of the electrode sheet 10 has the same polarity as either the positive electrode current collector plate 11 or the negative electrode current collector plate 12 that form one surface of the one solid-state battery unit 1a.

[0150] Specifically, in the intervening electrode sheet arrangement step, four electrode sheets 10 are arranged on the same plane so as not to overlap each other on the positive electrode current collector plate 11 forming one side of one solid-state battery unit 1a. At this time, the four electrode sheets 10 are arranged so that the positive electrode layer 102 contacts the positive electrode current collector plate 11 forming one side of one solid-state battery unit 1a.

[0151] Moreover, the four electrode sheets 10 are arranged, one by one, in each of four spaces defined by the substantially cross-shaped insulating members 13 arranged in the intervening insulating member arrangement step on the positive electrode current collector 11 forming one side of one solid-state battery unit 1a. In other words, it is preferable that the insulating members 13 are arranged between the four adjacent electrode sheets 10 on the same plane, and that the electrode sheets 10 contact the insulating members 13.

[0152] When another solid-state battery unit 1b is disposed, the electrode sheet 10 is interposed between the one solid-state battery unit 1a and the other solid-state battery unit 1b.

[0153] (Second solid-state battery unit placement process) 5D, in the second solid-state battery unit arrangement step, another solid-state battery unit 1b is further arranged on the multiple electrode sheets 10 arranged in the intervening electrode sheet arrangement step. In addition, the other solid-state battery unit 1b is brought into contact with the multiple electrode sheets 10 so that either one of the positive electrode current collector 11 and the negative electrode current collector 12 forming the other surface of the other solid-state battery unit 1b has the same polarity as the other electrode of the electrode sheet 10.

[0154] Specifically, in the second solid-state battery unit arranging step, another solid-state battery unit 1b is further arranged on the four electrode sheets 10 arranged in the intervening electrode sheet arranging step. At this time, the negative electrode current collector plate 12 forming the other surface of the other solid-state battery unit 1b comes into contact with the negative electrode layer 103 of the four electrode sheets 10.

[0155] Furthermore, the negative electrode current collector plate 12 forming the other surface of the other solid-state battery unit 1b may also be in contact with the insulating member 13 arranged in the intervening insulating member arrangement step.

[0156] The protruding direction of the positive electrode current collector tab 111 is the same in the positive electrode current collector plate 11 of the multiple solid-state battery units 1 (for example, one solid-state battery unit 1a and another solid-state battery unit 1b) included in the solid-state battery stack 2. The protruding direction of the negative electrode current collector tab 121 is also the same in the negative electrode current collector plate 12 of the multiple solid-state battery units 1 (for example, the solid-state battery unit 1a and the solid-state battery unit 1b) included in the solid-state battery stack 2.

[0157] In this manner, the solid-state battery stack 2 is manufactured.

[0158] The manufacturing method of the solid-state battery stack may include the manufacturing method of the solid-state battery unit described above. That is, in the manufacturing method of the solid-state battery stack described above, the one solid-state battery unit 1a and the other solid-state battery unit 1b are individually manufactured by the manufacturing method of the solid-state battery unit described above, but the present invention is not limited to this. Specifically, in the first solid-state battery unit preparation step described above, the one solid-state battery unit 1a may be manufactured by the manufacturing method of the solid-state battery stack described above, and in the second solid-state battery unit arrangement step described above, the other solid-state battery unit 1b may be manufactured by the manufacturing method of the solid-state battery stack described above.

[0159] According to such a manufacturing method of a solid-state battery stack, a plurality of the above-mentioned solid-state battery units can be arranged with insulating members and electrode sheets interposed therebetween, so that the solid-state battery stack can be easily manufactured.

[0160] 6. Solid-state battery pack With reference to FIG. 6, one embodiment of a solid-state battery pack 3 of the present invention will be described.

[0161] The solid-state battery pack 3 includes a solid-state battery stack 2 and an exterior body 14. Specifically, the solid-state battery pack 3 is formed by sealing the above-mentioned solid-state battery stack 2 in the exterior body 14.

[0162] <Exterior body> Examples of the exterior body 14 include a laminate type exterior body and a case type exterior body.

[0163] The material of the laminated exterior body is not particularly limited as long as it is stable to the electrolyte, and examples thereof include metals and resins. Examples of metals include aluminum. Examples of resins include polypropylene, polyethylene, and acrylic.

[0164] The laminated exterior body may be drawn to fit the shape of the solid-state battery stack 2.

[0165] The drawing depth of the laminated exterior body is not particularly limited, and is adjusted appropriately according to the thickness of the solid-state battery stack 2.

[0166] The material for the case-type exterior body is not particularly limited as long as it is stable to the electrolyte, and examples thereof include the same materials as those for the laminate-type exterior body described above.

[0167] The depth of the case-type exterior body is not particularly limited, and is adjusted appropriately according to the thickness of the solid-state battery stack 2.

[0168] The length of one side of the exterior body 14 in the planar direction X direction, the length of one side of the exterior body 14 in the planar direction Y direction, and the area of ​​the exterior body 14 in its plane are not particularly limited as long as the solid-state battery stack 2 can be enclosed therein.

[0169] In such a solid-state battery pack 3, since the thin solid-state battery stack 2 is enclosed in the exterior body 14 as described above, it can be easily enclosed in the exterior body 14. Therefore, damage to the exterior body 14 can be suppressed, and the reliability of the solid-state battery pack 3 can be improved.

[0170] In the solid-state battery pack 3, the solid-state battery stack 2 enclosed in the exterior body 14 is electrically connected to the outside via the positive electrode current collector tab 111 and the negative electrode current collector tab 121.

[0171] (Variation 1) In FIG. 1, in the solid-state battery unit 1, a total of four electrode sheets 10 are arranged, two in the planar direction X and two in the planar direction Y, but the present invention is not limited to this.

[0172] 7A, a total of two electrode sheets 10 are arranged in the solid-state battery unit 1, one in the planar direction X and two in the planar direction Y. Also, in FIG. 7B, a total of three electrode sheets 10 are arranged in the solid-state battery unit 1, one in the planar direction X and three in the planar direction Y.

[0173] As described above, in the solid-state battery unit 1, the number and arrangement of the electrode sheets 10 can be appropriately selected depending on the desired electric capacity and the shape of the solid-state battery unit 1.

[0174] 1, in the solid-state battery unit 1, the insulating members 13 are disposed between a total of four electrode sheets 10, two in the surface direction X and two in the surface direction Y, and have a generally cross shape in plan view, but are not limited thereto. Also, the insulating members 13 are all connected in a generally cross shape in plan view, but may be separated, and for example, four insulating members 13 having a generally rectangular shape in plan view may be disposed between each of the four electrode sheets 10.

[0175] In FIG. 7A, in the solid-state battery unit 1, the insulating member 13 is disposed between a total of two electrode sheets 10, one in the planar direction X direction and two in the planar direction Y direction, and has a generally straight shape in a plan view.

[0176] 7B, in the solid-state battery unit 1, the insulating members 13 are disposed between a total of three electrode sheets 10, one in the planar direction X and three in the planar direction Y, and have a generally straight shape in plan view. Two insulating members 13 each having a generally straight shape in plan view are disposed between each of the three electrode sheets 10.

[0177] In addition, the insulating member 13 may insulate the electrode sheets 10 from each other and further insulate the electrode sheets 10 from the outside. Specifically, although not shown, the insulating member 13 may be disposed along the edge of each electrode sheet 10. The insulating member 13 disposed along the edge of each electrode sheet 10 has a generally square shape in plan view relative to one electrode sheet 10.

[0178] (Variation 2) In the solid-state battery unit 1, the protruding direction of the positive electrode current collector tab 111 may be different from the protruding direction of the negative electrode current collector tab 121, but is not limited to this.

[0179] Although not shown, in the solid-state battery unit 1, the protruding direction of the positive electrode current collector tab 111 and the protruding direction of the negative electrode current collector tab 121 may be the same. In other words, the protruding side of the positive electrode current collector tab 111 in the positive electrode current collector plate body 110 and the protruding side of the negative electrode current collector tab 121 in the negative electrode current collector plate body 120 may be on the same side in a plan view. Specifically, the positive electrode current collector tab 111 protrudes from one side in the X direction or one side in the Y direction from the center of the side, while the negative electrode current collector tab 121 protrudes from the other side in the X direction or the other side in the Y direction from the center of the side, thereby preventing the positive electrode current collector tab 111 and the negative electrode current collector tab 121 from contacting each other.

[0180] As described above, in the solid-state battery unit 1, the protruding directions of the positive electrode current collector tab 111 and the negative electrode current collector tab 121 can be appropriately selected depending on the intended use.

[0181] (Application) The above-mentioned solid-state battery unit 1, solid-state battery stack 2, and solid-state battery pack 3 can be thinned and have an improved battery capacity. Therefore, they can be suitably used not only as a power source for small portable devices such as mobile phones, smartphones, and notebook computers, but also as a power source for large devices such as electric vehicles. [Explanation of symbols]

[0182] 1 Solid-state battery unit 10 Electrode sheet 11 Positive current collector 12 Negative current collector 13 Insulating materials 101 Electrolyte layer 102 Positive electrode layer 103 Negative electrode layer

Claims

1. an electrode sheet including an electrolyte layer, a positive electrode layer disposed on one surface of the electrolyte layer, and a negative electrode layer disposed on the other surface of the electrolyte layer; a positive electrode current collector in contact with the positive electrode layer of the electrode sheet; a negative electrode current collector in contact with the negative electrode layer of the electrode sheet; an insulating member that insulates the electrode sheet; Equipped with A plurality of the electrode sheets are arranged on the same plane so as not to overlap each other, the positive electrode current collector is disposed on one surface of the plurality of electrode sheets, the negative electrode current collector is disposed on the other surface of the plurality of electrode sheets, The insulating member is disposed between the plurality of electrode sheets adjacent to each other on the same plane.

2. The positive electrode current collector includes a positive electrode current collector body that overlaps with the positive electrode layer, and a positive electrode current collector tab that protrudes from an edge of the positive electrode current collector body, The negative electrode current collector includes a negative electrode current collector body overlapping the negative electrode layer, and a negative electrode current collector tab protruding from an edge of the negative electrode current collector body, The solid-state battery unit according to claim 1 , wherein a protruding direction of the positive electrode current collector tab is different from a protruding direction of the negative electrode current collector tab.

3. A solid-state battery stack in which a plurality of solid-state battery units according to claim 1 or 2 are stacked, the plurality of solid-state battery units are arranged such that the positive electrode current collector plate and the negative electrode current collector plate of each of the solid-state battery units adjacent to each other in the stacking direction face each other with the electrode sheet interposed therebetween; A plurality of the interposed electrode sheets are arranged on the same plane so as not to overlap each other, The positive electrode layers of the interposed electrode sheets are in contact with the positive electrode current collector plate, The negative electrode layers of the interposed electrode sheets are in contact with the negative electrode current collector plate, The insulating member is disposed between the plurality of coplanar adjacent electrode sheets.

4. A solid-state battery pack, comprising the solid-state battery stack according to claim 3 , enclosed in an exterior body.

5. A method for producing the solid-state battery unit according to claim 1 or 2, comprising the steps of: preparing one of the positive electrode current collector plate and the negative electrode current collector plate; disposing the insulating member on one surface of the one current collecting plate; a step of arranging a plurality of the electrode sheets on one surface of the one current collector plate so as not to overlap each other on the same plane, and a step of bringing the plurality of electrode sheets into contact with the one current collector plate so that either a positive electrode layer or a negative electrode layer of the electrode sheets has the same polarity as the one current collector plate; a step of arranging another current collecting plate on the plurality of electrode sheets, the other current collecting plate being brought into contact with the plurality of electrode sheets such that the other electrode layer of the electrode sheet has the same polarity as the other current collecting plate; A method for manufacturing a solid-state battery unit, comprising:

6. 6. The method for producing a solid-state battery unit according to claim 5, further comprising: pressure-molding the electrolyte layer, a positive electrode layer disposed on one surface of the electrolyte layer, and a negative electrode layer disposed on the other surface of the electrolyte layer to obtain the electrode sheet.

7. A method for producing a solid-state battery stack according to claim 3, comprising the steps of: preparing one of the solid-state battery units; disposing the insulating member on one surface of one of the solid-state battery units; a step of arranging the plurality of electrode sheets on one surface of one of the solid-state battery units so as not to overlap each other on the same plane, and a step of contacting the plurality of electrode sheets with the one of the solid-state battery units so that either one of the positive electrode layer and the negative electrode layer of the electrode sheet has the same polarity as either one of the positive electrode current collector plate and the negative electrode current collector plate that form the one surface of the one of the solid-state battery units; a step of further arranging another of the solid-state battery units on the plurality of electrode sheets, the step of bringing the other of the solid-state battery units into contact with the plurality of electrode sheets such that one of the positive electrode current collector and the negative electrode current collector forming the other surface of the other of the solid-state battery units has the same polarity as the other electrode layer of the electrode sheet; A method for manufacturing a solid-state battery stack, comprising:

8. 8. The method for producing a solid-state battery stack according to claim 7, further comprising: pressure-molding the electrolyte layer, a positive electrode layer disposed on one surface of the electrolyte layer, and a negative electrode layer disposed on the other surface of the electrolyte layer to obtain the electrode sheet.

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