Battery Stack

Abstract

To provide a battery laminate that can suppress increases in internal resistance.SOLUTION: A battery laminate 100 according to the present disclosure includes a power generation element 110 in which one or more electrode bodies 114 are laminated in which a positive electrode layer 113, a solid electrolyte layer 112, and a negative electrode layer 111 are laminated in this order, a positive electrode terminal 142 arranged on the side surface of the power generation element 110 and electrically connected to the positive electrode layer 113, a negative electrode terminal 141 arranged on the side surface of the power generation element 110 and electrically connected to the negative electrode layer 111, a positive electrode metal sputtered layer 152 disposed between the power generation element 110 and the positive electrode terminal 142, and a negative metal sputtered layer 151 disposed between the power generation element 110 and the negative electrode terminal 141, and the positive electrode terminal 142 and the negative electrode terminal 141 are sintered or fused metal bodies.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a battery stack. [Background technology]

[0002] Patent Document 1 discloses a solid-state battery including a solid-state battery main body formed by alternately stacking positive electrode layers and negative electrode layers with solid electrolyte layers interposed therebetween; end surface electrodes electrically connected to each of the positive electrode layers and the negative electrode layers and disposed on each of two side surfaces of the solid-state battery main body; and a bottom surface electrode electrically connected to the end surface electrodes and disposed on the bottom surface side of the solid-state battery main body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 132504 Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors have investigated ways to suppress an increase in the internal resistance of a battery stack containing a solid electrolyte and having a specific structure.

[0005] An object of the present disclosure is to provide a battery stack that can suppress an increase in internal resistance. [Means for solving the problem]

[0006] The present inventors have found that the above object can be achieved by the following means: Aspect 1 a power generating element including one or more electrode assemblies each having a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in this order; a positive electrode terminal disposed on a side surface of the power generating element and electrically connected to the positive electrode layer; a negative electrode terminal disposed on a side surface of the power generating element and electrically connected to the negative electrode layer; A positive electrode metal sputtered layer disposed between the power generating element and the positive electrode terminal; and a negative electrode metal sputtered layer disposed between the power generating element and the negative electrode terminal; It has The positive electrode terminal and the negative electrode terminal are sintered or fused bodies of metal. Battery stack. Aspect 2 The battery stack according to aspect 1, wherein the material of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer is a metal having a melting point of 260° C. or higher. Aspect 3 The power generating element contains sulfur, The material of the positive electrode metal sputter layer and / or the negative electrode metal sputter layer is at least one selected from the group including gold, platinum, nickel, and stainless steel; 3. The battery stack according to claim 1 or 2. Aspect 4 4. The battery stack according to aspect 3, wherein the sulfur is contained in a sulfide solid electrolyte and / or a sulfur-based active material. Aspect 5 The battery stack according to any one of aspects 1 to 4, wherein the positive electrode terminal and the negative electrode terminal extend to at least one end face of the battery stack in the stacking direction. Aspect 6 The battery stack according to any one of aspects 1 to 5, which is a lithium ion secondary battery. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a battery stack that can suppress an increase in internal resistance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a battery stack 100 according to a first embodiment of the present disclosure. [Diagram 2]FIG. 2 is a schematic diagram of a battery stack 200 according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the present disclosure.

[0010] The battery stack of the present disclosure is a battery stack comprising: a power generating element in which one or more electrode bodies are stacked, each of which has a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in this order; a positive electrode terminal arranged on a side surface of the power generating element and electrically connected to the positive electrode layer; a negative electrode terminal arranged on a side surface of the power generating element and electrically connected to the negative electrode layer; a positive electrode metal sputtered layer arranged between the power generating element and the positive electrode terminal; and a negative electrode metal sputtered layer arranged between the power generating element and the negative electrode terminal, wherein the positive electrode terminal and the negative electrode terminal are sintered bodies or fused bonded bodies of metal.

[0011] The battery stack may be configured to include a power generation element formed by stacking one or more electrode bodies in which a negative electrode layer, a solid electrolyte layer, and a positive electrode layer are stacked in this order, a negative electrode terminal electrically connected to the negative electrode layer and disposed on a side surface of the power generation element, and a positive electrode terminal electrically connected to the positive electrode layer and disposed on a side surface of the power generation element.

[0012] It is conceivable that a battery stack having such a configuration would be used by being fixed to a base material, such as a printed circuit board, by soldering or the like.

[0013] In such a battery stack, in order to improve the structural efficiency of the battery, it is sometimes attempted to provide both the positive and negative terminals and the function of sealing the battery by sintering or melt-bonding a metal to the side surface of the power generating element. However, when forming a sintered body or melt-bonded body of metal on the side surface of the power generating element, the wettability of the metal powder slurry or molten metal used to form the sintered body to the power generating element may not be sufficient, which may result in insufficient contact and / or adhesion between the formed positive and negative terminals and the power generating element, resulting in an increase in the electrical resistivity of the battery stack. In addition, there may be cases where the power generating element is not sufficiently sealed.

[0014] In the battery stack of the present disclosure, a metal sputter layer is disposed between the power generating element and the positive and negative terminals. The metal sputter layer formed by the sputtering method widely coats the power generating element and provides high bonding even when the power generating element contains a solid electrolyte. In addition, the metal sputter layer has good wettability with the metal powder slurry and molten metal used to form the metal sintered body or fused bond. Therefore, the battery stack of the present disclosure can suppress an increase in internal resistance and can achieve high sealing of the power generating element.

[0015] The battery stack of the present disclosure is particularly useful when the power generating element contains sulfur.

[0016] Sulfur-containing components that may be used in the power generating element, such as sulfide solid electrolytes and / or sulfur-based active materials, may chemically react with water. Therefore, when the power generating element contains sulfur, the battery stack is required to have sufficient sealing properties.

[0017] The battery stack of the present disclosure can realize high sealing performance of the power generating element as described above, and is therefore particularly advantageous when the power generating element contains sulfur. However, the positive electrode metal sputter layer and / or the negative electrode metal sputter layer may react with sulfur in the power generating element depending on the material. Therefore, when the power generating element contains sulfur, it is particularly preferable that the positive electrode metal sputter layer and / or the negative electrode metal sputter layer are made of a material that is low in reactivity with sulfur under the conditions of use of the battery stack, such as at least one selected from the group including gold, platinum, nickel, and stainless steel.

[0018] That is, in the battery stack of the present disclosure, it is particularly preferred that the power generating element contains sulfur, and that the material of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer is at least one selected from the group including gold, platinum, nickel, and stainless steel.

[0019] The sulfur can be contained in the sulfide solid electrolyte and / or the sulfur-based active material.

[0020] The battery stack of the present disclosure may be a lithium ion secondary battery.

[0021] Fig. 1 is a schematic diagram of a battery stack 100 according to a first embodiment of the present disclosure. More specifically, Fig. 1 is a cross-sectional view in the stacking direction of the battery stack 100 according to the first embodiment of the present disclosure.

[0022] The battery stack 100 according to the first embodiment of the present disclosure shown in FIG. 1 has a cubic shape. FIG. 1 shows a cross section of the battery stack 100 according to the first embodiment in the stacking direction. As shown in FIG. 1, the battery stack 100 according to the first embodiment of the present disclosure has a power generation element 110 in which one or more electrode bodies 114 are stacked, each of which has a negative electrode layer 111, a solid electrolyte layer 112, and a positive electrode layer 113 stacked in this order. The battery stack 100 has a negative electrode terminal 141 that is disposed on a side surface of the power generation element 110 and is electrically connected to the negative electrode layer 111, and a positive electrode terminal 142 that is disposed on a side surface of the power generation element 110 and is electrically connected to the positive electrode layer 113. The negative electrode terminal 141 and the positive electrode terminal 142 are disposed on two opposing side surfaces of the battery stack 100. The battery stack 100 also has a negative metal sputtered layer 151 disposed between the power generating element 110 and the negative terminal 141, and a positive metal sputtered layer 152 disposed between the power generating element 110 and the positive terminal 142. Here, the negative terminal 141 and the positive terminal 142 are sintered or fused metal bodies.

[0023] In the battery stack 100 according to the first embodiment of the present disclosure, an exterior body 130 is arranged on both sides of the battery stack 100 in the stacking direction and on two side faces (not shown) on which no external terminals are arranged, thereby sealing the power generating element 110 by the exterior body 130, the negative electrode terminal 141, and the positive electrode terminal 142.

[0024] In addition, insulating electrode end layers 120 are arranged between the negative electrode layer 111 and the outer casing 130 and between the solid electrolyte layers 112 of adjacent electrode bodies 114, thereby suppressing electrical contact between the negative electrode layer 111 and the outer casing 130, the positive electrode layer 113 and the outer casing 130, the negative electrode layer 111 and the positive electrode terminal 142, and the positive electrode layer 113 and the negative electrode terminal 141.

[0025] FIG. 2 is an example in which the negative electrode layer 211 and the positive electrode layer 213 are respectively composed of a negative electrode / positive electrode active material layer (211a and 213a) and a negative electrode / positive electrode current collector layer (211b and 213b), unlike FIG. 1. As shown in FIG. 2, in a battery stack 200 according to the second embodiment of the present disclosure, the negative electrode layer 211 has a structure in which the negative electrode current collector layer 211a and the negative electrode active material layer 211b are stacked on each other, and the negative electrode terminal 241 can be electrically connected to the negative electrode current collector layer 211a. Similarly, the positive electrode layer 213 has a structure in which the positive electrode current collector layer 213a and the positive electrode active material layer 213b are stacked on each other, and the positive electrode terminal 242 can be electrically connected to the positive electrode current collector layer 213a. In FIG. 2 , the battery stack 200 also has a negative metal sputtered layer 251 disposed between the power generating element 210 and the negative terminal 241, and a positive metal sputtered layer 252 disposed between the power generating element 210 and the positive terminal 242.

[0026] In the present disclosure, the electrode assembly has a negative electrode layer, a solid electrolyte layer, and a positive electrode layer laminated in this order.

[0027] The battery stack has a power generating element in which one or more electrode bodies are stacked, particularly a power generating element in which multiple electrode bodies are stacked in a monopolar structure. When the battery stack has only one electrode body, the battery stack has the configuration of a single cell. When the battery stack has a power generating element in which multiple electrode bodies are stacked, the stacking direction of each electrode body in the battery stack is the same as the stacking direction of the negative electrode layer, solid electrolyte layer, and positive electrode layer in the electrode body.

[0028] The power generating element contains sulfur. Here, the sulfur may be contained in, for example, a sulfide solid electrolyte and / or a sulfur-based active material. The sulfur may be contained in any of the negative electrode layer, the solid electrolyte layer, and the positive electrode layer of the electrode assembly.

[0029] The sulfide solid electrolyte may be, for example, a sulfide-based amorphous solid electrolyte, a sulfide-based crystalline solid electrolyte, or an argyrodite-type solid electrolyte. More specifically, the sulfide solid electrolyte may be a Li2S-P2S5-based (Li7P3S 11 , Li3PS4, Li8P2S9, etc.), Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-P2S5-GeS2(Li 13 GeP3S 16 , Li 10 GeP2S 12 etc.), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x P.S. 6-x Cl x etc.; or combinations thereof, but are not limited to these.

[0030] The sulfur-based active material is an active material containing at least S element. The sulfur-based active material may or may not contain Li element. Examples of the sulfur-based active material include elemental sulfur, lithium sulfide (Li2S), and lithium polysulfide (Li2S x , 2≦x≦8).

[0031] <Negative electrode layer> The negative electrode layer may have a structure in which, for example, a negative electrode current collector layer and a negative electrode active material layer are laminated on each other, and in this case, the negative electrode terminal may be electrically connected to the negative electrode current collector layer. Note that the negative electrode layer may not have a negative electrode current collector layer, and in this case, the negative electrode terminal may be electrically connected to the negative electrode active material layer by directly contacting the negative electrode current collector layer.

[0032] (Negative electrode active material layer) The negative electrode active material layer contains a negative electrode active material and, optionally, a solid electrolyte. In addition, the negative electrode active material layer may contain additives used in the negative electrode active material layer of a lithium ion battery, such as a conductive assistant or a binder, depending on the intended use or purpose.

[0033] The negative electrode active material may be, for example, a material capable of absorbing and releasing metal ions such as lithium ions. Examples of the material capable of absorbing and releasing metal ions such as lithium ions include, but are not limited to, an alloy-based negative electrode active material or a carbon material.

[0034] The alloy-based negative electrode active material is not particularly limited, and examples thereof include Si alloy-based negative electrode active materials and Sn alloy-based negative electrode active materials. The Si alloy-based negative electrode active material includes silicon, silicon oxide, silicon carbide, silicon nitride, and solid solutions thereof. The Si alloy-based negative electrode active material can include elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, Ti, and the like. The Sn alloy-based negative electrode active material can include tin, tin oxide, tin nitride, and solid solutions thereof. The Sn alloy-based negative electrode active material can include elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, Si, and the like. Among these, the Si alloy-based negative electrode active material is preferred.

[0035] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0036] The solid electrolyte is not particularly limited, and any material that can be used as a solid electrolyte for an all-solid-state battery can be used. More specifically, examples of the solid electrolyte include sulfide solid electrolytes, oxide solid electrolytes, nitride solid electrolytes, and polymer electrolytes.

[0037] Examples of sulfide solid electrolytes include, but are not limited to, sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, and argyrodite-type solid electrolytes. Specific examples of sulfide solid electrolytes include Li2S-P2S5-based (Li7P3S 11 , Li3PS4, Li8P2S9, etc.), Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-P2S5-GeS2(Li 13GeP3S 16 , Li 10 GeP2S 12 etc.), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x P.S. 6-x Cl x etc.; or combinations thereof, but are not limited to these.

[0038] An example of an oxide solid electrolyte is Li7La3Zr2O 12、 Li 7-x La3Zr 1-x Nb x O 12、 Li 7-3x La3Zr2Al x O 12 , Li 3x La 2 / 3-x TiO3, Li 1+x Al x Ti 2-x (PO4)3, Li 1+x Al x Ge 2-x (PO4)3, Li3PO4, or Li 3+x PO 4-x N x (LiPON), but is not limited to these.

[0039] The sulfide solid electrolyte, the oxide solid electrolyte, and the nitride solid electrolyte may be glass, glass ceramics, or a crystalline material. Glass can be obtained by amorphous processing of a raw material composition (e.g., a mixture of Li2S and P2S5). Examples of amorphous processing include mechanical milling. The mechanical milling may be dry mechanical milling or wet mechanical milling, with the latter being preferred. This is because the raw material composition can be prevented from adhering to the wall surface of a container or the like. Glass ceramics can be obtained by heat treating glass. Crystalline materials can be obtained, for example, by performing a solid-phase reaction process on the raw material composition.

[0040] Examples of the polymer electrolyte include, but are not limited to, polyethylene oxide (PEO) and polypropylene oxide (PPO).

[0041] The binder may be, for example, but is not limited to, materials such as polyvinylidene fluoride (PVdF), carboxymethyl cellulose (CMC), butadiene rubber (BR) or styrene butadiene rubber (SBR), or combinations thereof.

[0042] The conductive assistant may be a known one, for example, a carbon material, metal particles, etc. The carbon material may be at least one selected from the group consisting of carbon black such as acetylene black or furnace black, vapor grown carbon fiber (VGCF), carbon nanotubes, and carbon nanofibers, and from the viewpoint of electronic conductivity, may be at least one selected from the group consisting of VGCF, carbon nanotubes, and carbon nanofibers. The metal particles may be nickel, copper, iron, stainless steel, etc.

[0043] (Negative electrode current collector layer) The material used for the negative electrode current collector layer may be, but is not limited to, stainless steel (SUS), aluminum, copper, nickel, iron, titanium, carbon, etc. Among these, the material for the negative electrode current collector layer is preferably copper.

[0044] The shape of the negative electrode current collector layer is not particularly limited, and examples thereof include a foil-shaped, plate-shaped, or mesh-shaped electronically conductive material, and a layer-shaped material formed from an electronically conductive material powder and a binder. Among these, a foil-shaped electronically conductive material is preferred.

[0045] <Solid electrolyte layer> The solid electrolyte layer can contain a solid electrolyte and optionally a binder.

[0046] As the solid electrolyte and the binder, those described above in relation to the "(negative electrode active material layer)" can be appropriately used.

[0047] <Positive electrode layer> The positive electrode layer may have a structure in which a positive electrode current collector layer and a positive electrode active material layer are laminated on each other, and in this case, the positive electrode terminal may be electrically connected to the positive electrode current collector layer. Note that the positive electrode layer may not have a positive electrode current collector layer, and in this case, the positive electrode terminal may be electrically connected to the positive electrode active material layer by directly contacting the positive electrode current collector layer.

[0048] (Cathode active material layer) The positive electrode active material layer contains a positive electrode active material and, optionally, a solid electrolyte. In addition, the positive electrode active material layer may contain additives used in the positive electrode active material layer of a lithium ion battery, such as a conductive assistant or a binder, depending on the intended use or purpose.

[0049] The positive electrode active material is, for example, lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium manganese oxide (LiMn2O4), LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 O2, Li 1+x Mn 2-x-y M y The material may be, but is not limited to, a Li-Mn spinel substituted with a different element having a composition represented by O4 (M is one or more metal elements selected from Al, Mg, Co, Fe, Ni, and Zn).

[0050] In addition, such a positive electrode active material may be, for example, a sulfur-based active material. Here, the sulfur-based active material is an active material containing at least S element. The sulfur-based active material may or may not contain Li element. Examples of the sulfur-based active material include elemental sulfur, lithium sulfide (Li2S), and lithium polysulfide (Li2S x , 2≦x≦8).

[0051] As the solid electrolyte, the conductive assistant, and the binder, those described above in relation to the "(negative electrode active material layer)" can be appropriately used.

[0052] (Positive electrode current collector layer) The material used for the positive electrode current collector layer may be, but is not limited to, stainless steel (SUS), aluminum, copper, nickel, iron, titanium, carbon, etc. Among these, the material for the positive electrode current collector layer is preferably aluminum.

[0053] The shape of the positive electrode current collector layer is not particularly limited, and examples thereof include a foil-shaped, plate-shaped, or mesh-shaped electronically conductive material, etc. Examples of the material include a layer-shaped material formed from an electronically conductive material powder and a binder. Among these, a foil-shaped electronically conductive material is preferred.

[0054] Negative and positive terminals The battery stack of the present disclosure has a positive electrode terminal disposed on a side surface of the power generating element and electrically connected to the positive electrode layer, and a negative electrode terminal disposed on a side surface of the power generating element and electrically connected to the negative electrode layer, wherein the positive electrode terminal and the negative electrode terminal are sintered bodies or fused bodies of metal.

[0055] Here, the term "metal sintered body" refers to a sintered body of a metal, for example, a metal powder. The metal sintered body is formed by heating and sintering a metal, for example, a metal powder. The fused and bonded body of a metal is formed by melting and solidifying a metal.

[0056] The metals that can be used for the negative and positive terminals can be any metal that can be sintered or fusion bonded to form the terminals of a battery.

[0057] Such metals include, for example, Pb and Sn alloys, etc. Examples of Sn alloys include, for example, alloys of Sn and Au or Ni, etc.

[0058] When the power generating element contains sulfur, particularly when it contains a sulfide solid electrolyte, it is preferable to use any metal or metal alloy having a melting point of 260°C or higher as the metal used for the negative electrode terminal and the positive electrode terminal.

[0059] Such metals have a melting point of 260°C or higher, which is higher than the general heating temperature in the solder reflow process used to join the battery stack to a printed circuit board, etc. Therefore, it is possible to prevent the external terminals from melting when joining the battery stack to a printed circuit board, etc. Melting of the external terminals may cause problems such as a decrease in the sealing performance of the battery stack in some cases.

[0060] Furthermore, when the power generating element contains sulfur, particularly when it contains a sulfide solid electrolyte, it is preferable to use any metal or metal alloy having a melting point of 300°C or less for the metal used in the negative and positive terminals. This is because the external terminals can be formed by melting at a temperature lower than the reaction temperature of the sulfur that may be used in the power generating element. This makes it possible to suppress an increase in the internal resistance of the battery stack due to a reaction of the sulfur in the power generating element during the manufacture of the battery stack.

[0061] The melting point of metals that can be used for the negative and positive electrode terminals may be 260°C or more, 265°C or more, 270°C or more, or 275°C or more, and may be 300°C or less, 295°C or less, 290°C or less, 285°C or less, or 280°C or less.

[0062] The negative and positive terminals can extend to at least one end face of the battery stack in the stacking direction. When the battery stack has such a configuration, the end faces to which the negative and positive terminals extend can be fixed to the printed circuit board by, for example, soldering, thereby electrically connecting the battery stack to a circuit on the printed circuit board.

[0063] More specifically, as shown in FIG. 1, the negative electrode terminal 141 and the positive electrode terminal 142 can extend to the end faces of the battery stack 100 in the stacking direction (the upper and lower sides of the battery stack 100 in FIG. 1).

[0064] <<Negative electrode metal sputtered layer and positive electrode metal sputtered layer>> The battery stack of the present disclosure has a positive electrode metal sputtered layer disposed between the power generating element and the positive electrode terminal, and a negative electrode metal sputtered layer disposed between the power generating element and the negative electrode terminal.

[0065] The positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer can be formed by a sputtering method, for example, a DC sputtering method, an RC sputtering method, a magnetron sputtering method, an ion beam sputtering method, or the like.

[0066] The material of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer is preferably a metal having a melting point of 260° C. or higher.

[0067] Such metals have a melting point of 260°C or higher, which is higher than the general heating temperature in the solder reflow process used to join the battery stack to a printed circuit board or the like. This makes it possible to suppress melting of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer when joining the battery stack to a printed circuit board or the like. Melting of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer may, in some cases, cause problems such as a decrease in the sealing performance of the battery stack.

[0068] The melting point of the metal that can be used for the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer may be 260° C. or higher, 265° C. or higher, 270° C. or higher, or 275° C. or higher.

[0069] The material of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer preferably has a melting point higher than the sintering temperature or melting temperature of the metal used in the negative electrode terminal and the positive electrode terminal.

[0070] The positive metal sputtered layer and / or the negative metal sputtered layer can extend to at least one end face in the stacking direction of the battery stack. When the battery stack has such a configuration, the adhesion of the negative electrode terminal and the positive electrode terminal to the battery stack can be improved even in a configuration in which the negative electrode terminal and the positive electrode terminal extend to at least one end face in the stacking direction of the battery stack.

[0071] More specifically, as shown in FIG. 1, the negative electrode metal sputtered layer 151 and / or the positive electrode metal sputtered layer 152 can extend to the end faces in the stacking direction of the battery stack 100 (the upper and lower sides of the battery stack 100 in FIG. 1).

[0072] Exterior Body In the battery stack of the present disclosure, the power generating element is preferably sealed by the exterior body, the negative electrode terminal, and the positive electrode terminal.

[0073] Here, the exterior body may be made of any material capable of sealing the power generating element, such as a resin or ceramics. [Explanation of symbols]

[0074] 100 and 200 Battery Stacks 110 and 210 Power generation elements 111 and 211 negative electrode layers 112 and 212 solid electrolyte layers 113 and 213 positive electrode layers 114 and 214 Electrode body 120 and 220 electrode end layers 130 and 230 Exterior body 141 and 241 Negative terminal 142 and 242 Positive terminal 151 and 251 Negative metal sputtered layer 152 and 252 Positive metal sputtered layer 211a Negative electrode current collector layer 211b Negative electrode active material layer 213a Positive electrode current collector layer 213b Cathode active material layer

Claims

1. a power generating element including one or more electrode assemblies each having a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in this order; a positive electrode terminal disposed on a side surface of the power generating element and electrically connected to the positive electrode layer; a negative electrode terminal disposed on a side surface of the power generating element and electrically connected to the negative electrode layer; a positive electrode metal sputtered layer disposed between the power generating element and the positive electrode terminal; a negative electrode metal sputter layer disposed between the power generating element and the negative electrode terminal; and Exterior body It has the positive electrode terminal and the negative electrode terminal are sintered or fused bodies of metal, The power generating element contains sulfur, The material of the positive electrode metal sputter layer and / or the negative electrode metal sputter layer is at least one selected from the group including gold, platinum, nickel, and stainless steel, The power generating element is sealed by an exterior body, a negative electrode terminal, and a positive electrode terminal. Battery stack.

2. 2. The battery stack according to claim 1, wherein the material of the positive electrode metal sputtered layer and / or the negative electrode metal sputtered layer is a metal having a melting point of 260° C. or higher.

3. The battery stack according to claim 1 , wherein the sulfur is contained in a sulfide solid electrolyte and / or a sulfur-based active material.

4. 2 . The battery stack according to claim 1 , wherein the positive electrode terminal and the negative electrode terminal extend to at least one end face of the battery stack in a stacking direction.

5. The battery stack according to claim 1 , which is a lithium ion secondary battery.

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