All-solid battery

Abstract

To provide an all-solid battery that can suppress internal temperature rise.SOLUTION: An all-solid battery includes a laminate formed by stacking a positive electrode layer, a negative electrode layer, a solid electrolyte layer, a positive electrode current collector, and a negative electrode current collector, and the positive electrode current collector has a first exposed portion exposed from the laminate and is joined to a positive electrode tab at the first exposed portion, the negative electrode current collector has a second exposed portion exposed from the laminate and is joined to the negative electrode tab at the second exposed portion, and the laminate has a through hole that penetrates from the top surface to the bottom surface of the laminate along the stacking direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to all-solid-state batteries.

Background Art

[0002] A solid electrolyte battery is known that includes a cell including a first current collector, a cylindrical second current collector that encloses the first current collector, and an electrode group in which a separator having a negative electrode, a positive electrode, and a solid electrolyte is laminated, and a consolidation mechanism that consolidates the electrode group (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the solid electrolyte battery described in Patent Document 1, when a plurality of cells are laminated, the inside of another cell is sealed by the bottom of one cell, and heat is easily retained. Therefore, there is a problem that the temperature inside the solid electrolyte battery rises.

[0005] The problem to be solved by the present invention is to provide an all-solid-state battery capable of suppressing an increase in internal temperature.

Means for Solving the Problems

[0006] The present invention is an all-solid-state battery including a laminate formed by laminating a positive electrode layer, a negative electrode layer, a solid electrolyte layer, a positive electrode current collector, and a negative electrode current collector. The positive electrode current collector has a first exposed portion exposed from the laminate and is joined to a positive electrode tab at the first exposed portion. The negative electrode current collector has a second exposed portion exposed from the laminate and is joined to a negative electrode tab at the second exposed portion. The laminate has a through hole penetrating from the top surface to the bottom surface of the laminate along the lamination direction, thereby solving the above problems.

Advantages of the Invention

[0007] According to the present invention, the temperature rise inside the all-solid-state battery can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0009] The all-solid-state battery according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing the all-solid-state battery of the present invention. Further, FIG. 2 is a cross-sectional view of the all-solid-state battery taken along line A-A′ in FIG. 1. The all-solid-state battery 1 includes a laminate 10, an exterior member 20, a positive electrode tab 31, and a negative electrode tab 32. The laminate 10 is formed by laminating a positive electrode layer 11a, a positive electrode current collector 11b, a negative electrode layer 12a, a negative electrode current collector 12b, and a solid electrolyte layer 13. Details of these power generation elements will be described later. In FIGS. 1 and 2, the X-axis and the Y-axis are directions (plane directions) along the top surface of the laminate 10. The direction in which the positive electrode current collector 11b and the negative electrode current collector 12b protrude from the laminate 10 is defined as the X-axis direction. The Y-axis is perpendicular to the X-axis in the XY plane. The direction perpendicular to the XY plane is defined as the Z-axis. The Z-axis direction is the stacking direction in which the power generation elements are stacked.

[0010] The stacking structure of each power generation element in the laminate 10 will be described. The laminate 10 is composed of a plurality of positive electrode members 11, a plurality of negative electrode members 12, and a plurality of solid electrolyte layers 13. The positive electrode member 11 has a pair of positive electrode layers 11a and a positive electrode current collector 11b laminated between the pair of positive electrode layers 11a. Further, the negative electrode member 12 has a pair of negative electrode layers 12a and a negative electrode current collector 12b laminated between the pair of negative electrode layers 12a. The solid electrolyte layer 13 is laminated between the positive electrode member 11 and the negative electrode member 12. Each layer is laminated in a state of being in surface contact with each other. By the surface contact between the positive electrode layer 11a and the positive electrode current collector 11b, the electrical resistance between the positive electrode layer and the positive electrode current collector 11b is reduced. By the surface contact between the negative electrode layer 12a and the negative electrode current collector 12b, the electrical resistance between the negative electrode layer 12a and the negative electrode current collector 12b is reduced.

[0011] Next, the power generation element will be described. The positive electrode layer 11a, the positive electrode current collector 11b, the negative electrode layer 12a, the negative electrode current collector 12b, and the solid electrolyte layer 13 are sheet-like members and have a circular shape in plan view. The positive electrode layer 11a, the positive electrode current collector 11b, the negative electrode layer 12a, the negative electrode current collector 12b, and the solid electrolyte layer 13 have a hole that penetrates the top surface and the bottom surface at the central portion of the circular member when viewed from the stacking direction. That is, these power generation elements have a so-called donut shape in plan view. In the laminate 10 in which these power generation elements are laminated, the holes of each layer overlap in the plane direction. By connecting the holes of each layer from the top surface to the bottom surface of the laminate 10, a through hole 2 is formed in the central portion of the laminate 10. As shown in FIG. 2, the through hole 2 penetrates to the top surface and the bottom surface of the laminate 10 along the stacking direction (Z-axis direction). The through hole 2 is circular when viewed from the stacking direction.

[0012] The positive electrode layer 11a contains at least a positive electrode active material capable of releasing and occluding lithium (Li), and is not particularly limited, but a lithium-containing metal oxide is preferable. That is, according to a preferred embodiment of the present invention, the positive electrode active material contains at least one selected from lithium-containing metal oxides. According to a more preferred embodiment of the present invention, the positive electrode active material is composed of only at least one selected from lithium-containing metal oxides. Specific examples of the lithium-containing metal oxide include layered rock salt type active materials such as LiCoO2, LiMnO2, LiNiO2, Li(Ni-Mn-Co)O2, spinel type active materials such as LiMn2O4, LiNi 0.5 Mn 1.5 O4, olivine type active materials such as LiFePO4, LiMnPO4, Si-containing active materials such as Li2FeSiO4, Li2MnSiO4, etc. Further, as oxide active materials other than the above, for example, Li4Ti5O 12, LiVO2 can be mentioned. Among them, Li(Ni-Mn-Co)O2 and those in which some of these transition metals are substituted by other elements (NMC composite oxides) are preferably used as the positive electrode active material. These positive electrode active materials may be used alone or in combination of two or more. Also, the positive electrode current collector 11b is a foil-shaped member having conductivity. The positive electrode current collector 11b is, for example, a metal foil, and as this metal foil, a copper foil can be exemplified. The positive electrode current collector 11b may be composed of a resin having conductivity.

[0013] The negative electrode layer 12a is an alkali metal layer mainly composed of an alkali metal that is released from the positive electrode layer 11a during charging of the all-solid-state battery 1, reaches the negative electrode current collector 12b through the solid electrolyte layer 13, and deposits. The negative electrode layer 12a is a layer that deposits on the negative electrode current collector 12b during charging of the all-solid-state battery 1 and increases in volume, and decreases in volume during discharging. The negative electrode layer 12a is, for example, a lithium metal layer. Note that the negative electrode layer 12a may include a layer other than the lithium metal layer, and for example, may include an auxiliary layer that assists the deposition of the lithium metal layer. The negative electrode current collector 12b is a foil-shaped member having conductivity. The negative electrode current collector 12b is, for example, a metal foil, and as this metal foil, a copper foil can be exemplified. The negative electrode current collector 12b may be composed of a resin having conductivity.

[0014] As the solid electrolyte layer 13, for example, a sulfide solid electrolyte or an oxide solid electrolyte can be used, but it is preferable to use a sulfide solid electrolyte. In this embodiment, the laminate 10 is configured by laminating a plurality of positive electrode members 11, a plurality of negative electrode members 12, and a plurality of solid electrolyte layers 13. However, it is not limited to this, and the laminate 10 may be configured by laminating the positive electrode member 11, the negative electrode member 12, and the solid electrolyte layer 13 one by one. The positive electrode tab 31 and the negative electrode tab 32 are plate-shaped members having conductivity. The positive electrode tab 31 and the negative electrode tab 32 are composed of, for example, a metal or a resin having conductivity.

[0015] The all-solid-state battery 1 includes an exterior member 20 and houses a laminate 10 inside the exterior member 20. For the exterior member 20, for example, a laminate film or the like is used. The exterior member 20 is composed of a main body member 20a that houses the laminate 10, a lid member 20b disposed at the opening of the main body member 20a, and a through-hole forming portion 20c formed in the through-hole 2. The main body member 20a is a bottomed cylindrical housing. The main body member 20a has a circular bottom portion 21 and a side surface portion 22 that is substantially orthogonal to the bottom portion 21 from the circumference of the bottom portion 21. The lid member 20b is a plate-like member and is a member having the same circular shape as the bottom portion 21 when viewed from the stacking direction. The lid member 20b is disposed so as to face the bottom portion 21. The lid member 20b has a hole portion 23 at the central portion of the member in a plan view. The bottom portion 21 of the main body member 20a has a hole portion 24 at the central portion of the member in a plan view. The hole portions 23 and 24 are circular when viewed from the stacking direction. The lid member 20b and the bottom portion 21 of the main body member 20a have a so-called donut shape. In the present embodiment, in a state where the lid member 20b is disposed at the opening of the main body member 20a, the hole portion 23 and the hole portion 24 are opposed to each other and are formed at positions overlapping in the plane direction.

[0016] The exterior member 20 includes a through-hole forming portion 20c inside the exterior member 20. The through-hole forming portion 20c is a pipe-like member. The outer diameter of the through-hole forming portion 20c is smaller than the outer diameter of the main body member 20a and is the same as the diameters of the hole portions 23 and 24. Both ends of the through-hole forming portion 20c are joined to the hole portion 23 of the lid member 20b and the hole portion 24 of the bottom portion 21, respectively. That is, one end portion of the through-hole forming portion 20c is formed so as to be substantially orthogonal to the bottom portion 21 from the circumference of the hole portion 24 of the bottom portion 21. The other end portion of the through-hole forming portion 20c is formed so as to be substantially orthogonal to the lid member 20b from the circumference of the hole portion 23 of the lid member 20b. Thereby, the hole portion 23 and the hole portion 24 are connected. The space between the side surface portion 22 of the main body member 20a and the through-hole forming portion 20c is a donut-shaped space when viewed from the stacking direction. The laminate 10 is housed inside the main body member 20a such that the through-hole forming portion 20c is inserted through the hole portions of each layer. Thereby, the laminate 10 is concentrically arranged in the space between the side surface portion 22 of the main body member 20a and the through-hole forming portion 20c.

[0017] In the laminate 10, a part of the positive electrode current collector 11b and the negative electrode current collector 12b is exposed from the laminate 10. The positive electrode current collector 11b has a first contact portion 111 that contacts the pair of positive electrode layers 11a on both sides inside the laminate 10, and a first exposed portion 112 that is exposed from the laminate 10. The first contact portion 111 is a circular portion when viewed from the lamination direction. The first exposed portion 112 is a rectangular portion and is formed so as to protrude from the circumference of the first contact portion 111. The positive electrode current collector 11b is joined to the positive electrode tab 31 at the first exposed portion 112. Specifically, as shown in FIG. 1, the positive electrode current collector 11b is in surface contact with the positive electrode tab 31. By the positive electrode current collector 11b and the positive electrode tab 31 being in surface contact, the electrical resistance between the positive electrode current collector 11b and the positive electrode tab 31 is reduced. The negative electrode current collector 12b has a second contact portion 121 that contacts the pair of negative electrode layers 12a inside the laminate 10, and a second exposed portion 122 that is exposed from the laminate 10. The second contact portion 121 is a circular portion when viewed from the lamination direction. The second exposed portion 122 is a rectangular portion and is formed so as to protrude from the circumference of the second contact portion 121. The negative electrode current collector 12b is joined to the negative electrode tab 32 at the second exposed portion 122. Specifically, as shown in FIG. 1, the negative electrode current collector 12b is in surface contact with the negative electrode tab 32. By the negative electrode current collector 12b and the negative electrode tab 32 being in surface contact, the electrical resistance between the negative electrode current collector 12b and the negative electrode tab 32 is reduced. The first exposed portion 112 and the second exposed portion 122 are arranged at positions that are point-symmetrical with respect to the through-hole 2. The positive electrode tab 31 and the negative electrode tab 32 are electrically connected to positive and negative terminals (not shown), respectively.

[0018] In this embodiment, the exterior member 20 has an exposure port 222 that exposes the exposed portions of the positive current collector 11b or the negative current collector 12b to the outside on the side surface portion 22 of the exterior member 20. The first exposed portion 112 and the second exposed portion 122 are inserted into the exposure port 222 so as to be exposed from the inside to the outside of the exterior member 20. When a plurality of positive current collectors 11b and negative current collectors 12b are laminated, a plurality of exposure ports 222 corresponding to the respective current collectors are formed on the side surface portion 22 of the exterior member 20. For example, on the side surface portion 22 of the exterior member 20, a plurality of exposure ports 222 corresponding to the plurality of positive current collectors 11b are arranged along the stacking direction (Z-axis direction). Further, on the side surface portion 22 of the exterior member 20, a plurality of exposure ports 222 corresponding to the plurality of negative current collectors 12b are arranged along the stacking direction (Z-axis direction).

[0019] Also, the all-solid-state battery 1 may include a cooling mechanism for dissipating heat from the laminate 10. For example, the all-solid-state battery 1 includes a cooling mechanism that supplies a cooling medium to the through hole 2. The cooling medium is a gas such as air or a liquid such as water. FIG. 3 is a view showing the supply direction in which the cooling medium is supplied to the through hole in the cross-sectional view of the all-solid-state battery according to this embodiment. The configuration of the all-solid-state battery 1 shown in FIG. 3 is the same as the configuration of the all-solid-state battery 1 shown in FIG. 2 except for the configuration described below. For the same configuration as in FIG. 2, the same reference numerals are given and the description is omitted, and the description in FIG. 2 is appropriately incorporated. As shown in FIG. 3, the cooling medium is supplied into the through hole 2 along the supply direction D by a cooling mechanism (not shown). The cooling mechanism is, for example, a fan that supplies air or a pump that supplies water.

[0020] In addition, in the all-solid-state battery 1, a rod-shaped metal member may be inserted into the through-hole 2. The metal member is a metal member capable of heat conduction, for example, copper or aluminum. The diameter of the metal member is smaller than the inner diameter of the through-hole forming portion 20c. FIG. 4 is a cross-sectional view of the all-solid-state battery according to the present embodiment, showing a state in which a metal member is inserted into the through-hole. The configuration of the all-solid-state battery 1 shown in FIG. 4 is the same as the configuration of the all-solid-state battery 1 shown in FIG. 2, except for the configuration described below. For the same configuration as in FIG. 2, the same reference numerals are given, and the description is omitted, and the description in FIG. 2 is appropriately incorporated. As shown in FIG. 4, the metal member 3 is inserted into the through-hole 2. Both ends of the metal member 3 protrude from the top surface and the bottom surface of the laminate 10, respectively.

[0021] In addition, the all-solid-state battery 1 may include a restraint mechanism for restraining the laminate 10. For example, in the all-solid-state battery 1, a pair of restraint plates may be arranged on the top surface and the bottom surface of the laminate 10, and a bolt for connecting the pair of restraint plates may be inserted into the through-hole 2. In the present embodiment, as an example of the pair of restraint plates, the lid member 20b and the bottom portion 21 of the main body member 20a are mentioned. FIG. 5 is a cross-sectional view of the all-solid-state battery according to the present embodiment, showing a state in which a bolt is inserted into the through-hole. The configuration of the all-solid-state battery 1 shown in FIG. 5 is the same as the configuration of the all-solid-state battery 1 shown in FIG. 2. For the same configuration as in FIG. 2, the same reference numerals are given, and the description is omitted, and the description in FIG. 2 is appropriately incorporated. As shown in FIG. 5, the bolt 4 is inserted into the through-hole 2. One end of the bolt 4 is fixed to the lid member 20b. A nut 5 is tightened from below the bottom portion 21 to the other end of the bolt 4. By tightening the nut 5, a restraint pressure can be applied to the laminate 10.

[0022] In addition, in the present embodiment, the restraining mechanism for restraining the laminate 10 may be constituted by an elastic member. The elastic member is a member that connects a pair of restraining plates and has elasticity, and is, for example, a tension coil spring. The elastic member is installed so as to be inserted into the through-hole 2. Both ends of the elastic member are respectively joined to the top surface and the bottom surface of the laminate 10, and by a spring that connects both ends, the elastic member biases the top surface and the bottom surface in a direction approaching each other. FIG. 6 is a view showing a state in which an elastic member is inserted into a through-hole in a cross-sectional view of the all-solid-state battery according to the present embodiment. The configuration of the all-solid-state battery 1 shown in FIG. 6 is the same as the configuration of the all-solid-state battery 1 shown in FIG. 2. For the same configuration as in FIG. 2, the same reference numerals are given, and the description is omitted, and the description in FIG. 2 is appropriately incorporated. As shown in FIG. 6, the elastic member 6 has a pair of coupling portions 7 and a spring portion 8 that connects the pair of coupling portions 7. The pair of coupling portions 7 are respectively joined to the lid member 20b and the bottom portion 21. The elastic member 6 is inserted into the through-hole 2. That is, the spring portion 8 is housed in the through-hole 2. The spring portion 8 biases the lid member 20b and the bottom portion 21 in a direction approaching each other. Thereby, while restraining the laminate 10, it is possible to prevent an increase in the restraining pressure applied to the laminate 10 due to the expansion and contraction of the laminate 10.

[0023] In addition, in the present embodiment, the joining position where the positive electrode tab 31 and the first exposed portion 112 are joined is not limited to being located at the exposure port 222 of the side surface portion 22 of the laminate 10, and may be located above the top surface of the laminate 10 or below the bottom surface of the laminate 10. Similarly, the joining position where the negative electrode tab 32 and the second exposed portion 122 are joined is not limited to being located at the exposure port 222 of the side surface portion 22 of the laminate 10, and may be located above the top surface of the laminate 10 or below the bottom surface of the laminate 10. For example, the positive electrode tab 31 is disposed at a position either above the lid member 20b or below the bottom portion 21. The negative electrode tab 32 is disposed at the other position either above the lid member 20b or below the bottom portion 21. The first exposed portion 112 and the second exposed portion 122 exposed from the exposure port 222 extend along the side surface portion 22 to the positions of the positive electrode tab 31 and the negative electrode tab 32, respectively, and are joined to the positive electrode tab 31 and the negative electrode tab 32.

[0024] FIG. 7 is a diagram showing an example of the position where the electrode tab is arranged in the cross-sectional view of the all-solid-state battery. The first exposed portion 112 of the positive electrode current collector 11b has a first extending portion 112a that extends along the stacking direction on the side surface portion 22 of the laminate 10, and a first tip portion 112b that extends from the outer edge 211 of the bottom portion 21 of the laminate 10. The first extending portion 112a extends so as to be in contact with the side surface portion 22, and is joined to each first contact portion 111 inside the laminate 10 and the outlet 222 of the side surface portion 22 of the exterior member 20. The positive electrode current collector 11b is joined to the positive electrode tab 31 at the first tip portion 112b. The positive electrode tab 31 has a surface along the YZ plane and extends in the Z-axis direction. That is, the first exposed portion 112 of the positive electrode current collector 11b and the positive electrode tab 31 are formed in a direction perpendicular to the surface direction of each layer of the laminate 10. Further, the second exposed portion 122 of the negative electrode current collector 12b has a second extending portion 122a that extends along the stacking direction on the side surface portion 22 of the laminate 10, and a second tip portion 122b that extends from the outer edge 201 of the lid member 20b of the laminate 10. The second extending portion 122a extends so as to be in contact with the side surface portion 22, and is joined to each second contact portion 121 inside the laminate 10 and the outlet 222 of the side surface portion 22 of the exterior member 20. The negative electrode current collector 12b is joined to the negative electrode tab 32 at the second tip portion 122b. The negative electrode tab 32 has a surface along the YZ plane and extends in the Z-axis direction. That is, the second exposed portion 122 of the negative electrode current collector 12b and the negative electrode tab 32 are formed in a direction perpendicular to the surface direction of each layer of the laminate 10.

[0025] FIG. 8 is a side view of the all-solid-state battery shown in FIG. 7. In FIG. 8, a side view of the all-solid-state battery when viewed from the negative direction of the X-axis is shown. As shown in FIG. 8, the first exposed portion 112 of the positive electrode current collector 11b exposed from each exposed port 222 of the exterior member 20 has a first extending portion 112a that extends from the exposed port 222 closest to the outer edge 201 of the lid member 20b to the outer edge 211 of the bottom portion 21 in the stacking direction along the side surface portion 22. The first extending portion 112a extends along the positions of the respective exposed ports 222. The first tip portion 112b is a portion that extends further downward than the outer edge 211 of the bottom portion 21 in a side view. The first tip portion 112b is joined to the positive electrode tab 31. Further, the negative electrode current collector 12b extends to the side surface portion 22 on the side opposite to the side surface portion 22 where the positive electrode current collector 11b extends. The negative electrode current collector 12b extends along the positions of the respective exposed ports 222 in the same manner as the positive electrode current collector 11b. The second tip portion 122b is a portion that extends further upward than the outer edge 201 of the lid member 20b in a side view. The second tip portion 122b is joined to the negative electrode tab 32.

[0026] As described above, the all-solid-state battery according to the present embodiment includes a laminate in which a positive electrode layer, a negative electrode layer, a solid electrolyte layer, a positive electrode current collector, and a negative electrode current collector are laminated. The positive electrode current collector has a first exposed portion exposed from the laminate, and is joined to the positive electrode tab at the first exposed portion. The negative electrode current collector has a second exposed portion exposed from the laminate, and is joined to the negative electrode tab at the second exposed portion. The laminate has a through hole that penetrates from the top surface to the bottom surface of the laminate along the stacking direction. Thereby, an increase in temperature inside the all-solid-state battery can be suppressed.

[0027] Further, in the all-solid-state battery according to the present embodiment, when viewed from the stacking direction, the through hole is circular. Thereby, by preventing damage to the edge portion of the through hole, a short circuit due to damage to the electrode can be prevented.

[0028] Further, the all-solid-state battery according to the present embodiment includes a cooling mechanism that supplies gas to the through hole. Thereby, heat dissipation inside the all-solid-state battery can be achieved.

[0029] In addition, the all-solid-state battery according to the present embodiment includes a cooling mechanism that supplies a liquid to the through holes. Thereby, heat dissipation inside the all-solid-state battery can be achieved.

[0030] In addition, in the all-solid-state battery according to the present embodiment, a rod-shaped metal member is inserted into the through holes. Thereby, heat dissipation inside the all-solid-state battery can be achieved.

[0031] In addition, in the all-solid-state battery according to the present embodiment, a pair of restraint plates are arranged on the top surface and the bottom surface of the laminate, and bolts for connecting the pair of restraint plates are inserted into the through holes. As a result, surface pressure is applied to the surface between the solid electrolyte and the electrode, so that the interfacial resistance can be reduced.

[0032] In addition, in the all-solid-state battery according to the present embodiment, a pair of restraint plates are arranged on the top surface and the bottom surface of the laminate, and elastic members for connecting the pair of restraint plates are inserted into the through holes. Thereby, an appropriate load can be applied to the all-solid-state battery in accordance with the expansion and contraction of the electrodes.

[0033] In addition, in the all-solid-state battery according to the present embodiment, the first exposed portion extends along the stacking direction on the side surface of the laminate and has a first tip portion extending from the outer edge of one of the top surface and the bottom surface of the laminate. The positive electrode current collector is joined to the positive electrode tab at the first tip portion. The second exposed portion extends along the stacking direction on the side surface of the laminate and has a second tip portion extending from the outer edge of the other of the top surface and the bottom surface of the laminate. The negative electrode current collector is joined to the negative electrode tab at the second tip portion. Thereby, an increase in the diameter of the all-solid-state battery can be prevented.

[0034] In addition, in the all-solid-state battery according to the present embodiment, the laminate includes a positive electrode member having a pair of positive electrode layers and a positive electrode current collector laminated in a state of being in surface contact between the pair of positive electrode layers, a negative electrode member having a pair of negative electrode layers and a negative electrode current collector laminated in a state of being in surface contact between the pair of negative electrode layers, and a solid electrolyte layer laminated in a state of being in surface contact between the positive electrode member and the negative electrode member. As a result, since the positive electrode layer, the negative electrode layer, and the solid electrolyte layer are present between the positive and negative electrode current collectors, contact between the positive and negative electrode current collectors can be prevented while reducing the electrical resistance between the layers.

[0035] Note that the embodiments described above are described to facilitate the understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiments is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

Explanation of Reference Numerals

[0036] 1... all-solid-state battery 2... through hole 10... laminate 11a... positive electrode layer 11b... positive electrode current collector 112... first exposed portion 12a... negative electrode layer 12b... negative electrode current collector 122... second exposed portion 13... solid electrolyte layer 20... exterior member 31... positive electrode tab 32... negative electrode tab

Claims

1. A laminate comprising a positive electrode layer, a negative electrode layer, a solid electrolyte layer, a positive electrode current collector, and a negative electrode current collector, wherein the positive electrode current collector has a first exposed portion exposed from the laminate, and is joined to a positive electrode tab at the first exposed portion, the negative electrode current collector has a second exposed portion exposed from the laminate, and is joined to a negative electrode tab at the second exposed portion, and the laminate is an all-solid-state battery having a through-hole penetrating from the top surface to the bottom surface of the laminate along the stacking direction.

2. The all-solid-state battery according to claim 1, wherein the through-hole is circular when viewed from the stacking direction.

3. The all-solid-state battery according to claim 1 or 2, comprising a cooling mechanism for supplying gas to the through-hole.

4. The all-solid-state battery according to claim 1 or 2, comprising a cooling mechanism for supplying liquid to the through-hole.

5. The all-solid-state battery according to claim 1 or 2, wherein a rod-shaped metal member is inserted into the through-hole.

6. The all-solid-state battery according to claim 1 or 2, wherein a pair of restraint plates are disposed on the top surface and the bottom surface of the laminate, and a bolt for connecting the pair of restraint plates is inserted into the through-hole.

7. The all-solid-state battery according to claim 1 or 2, wherein a pair of restraint plates are disposed on the top surface and the bottom surface of the laminate, and an elastic member for connecting the pair of restraint plates is inserted into the through-hole.

8. The all-solid-state battery according to claim 1 or 2, wherein the first exposed portion extends along the stacking direction on the side surface of the laminate, has a first tip portion extending from the outer edge of one of the top surface and the bottom surface of the laminate, and the positive electrode current collector is joined to the positive electrode tab at the first tip portion, the second exposed portion extends along the stacking direction on the side surface of the laminate, has a second tip portion extending from the outer edge of the other of the top surface and the bottom surface of the laminate, and the negative electrode current collector is joined to the negative electrode tab at the second tip portion.

9. The all-solid-state battery according to claim 1 or 2, wherein the laminate has a positive electrode member including a pair of the positive electrode layers and the positive electrode current collector laminated in a state of being in surface contact with each other between the pair of the positive electrode layers, and a negative electrode member including a pair of the negative electrode layers and the negative electrode current collector laminated in a state of being in surface contact with each other between the pair of the negative electrode layers. An all-solid-state battery composed of the solid electrolyte layer laminated in a state of surface contact between the positive electrode member and the negative electrode member.

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