JP2024007780A - battery laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a battery stack.

Patent Document 1 discloses a solid battery main body in which positive electrode layers and negative electrode layers are alternately stacked with solid electrolyte layers interposed therebetween; the solid battery main body is electrically connected to each of the positive electrode layer and the negative electrode layer, and is electrically connected to each of the positive electrode layer and the negative electrode layer; Discloses a solid-state battery comprising an end electrode disposed on each of two side surfaces of the solid-state battery; and a lower electrode electrically connected to the end electrode and disposed on the lower surface side of the solid-state battery main body. .

International Publication No. 2021/132504

The present inventor has considered suppressing an increase in internal resistance of a battery stack containing a solid electrolyte and having a predetermined structure.

An object of the present disclosure is to provide a battery stack that can suppress an increase in internal resistance.

The present discloser has discovered that the above object can be achieved by the following means:
《Aspect 1》
A power generation element in which one or more electrode bodies are laminated in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are laminated in this order;
a positive electrode terminal disposed on a side surface of the power generation element and electrically connected to the positive electrode layer;
a negative electrode terminal disposed on a side surface of the power generation element and electrically connected to the negative electrode layer;
a positive electrode metal sputtered layer disposed between the power generation element and the positive electrode terminal; and a negative electrode metal sputtered layer located between the power generation element and the negative electrode terminal.
It has
The positive electrode terminal and the negative electrode terminal are a sintered body or a fused metal body,
Battery laminate.
《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 generation element contains sulfur,
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 containing gold, platinum, nickel, or stainless steel.
The battery laminate according to aspect 1 or 2.
《Aspect 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 surface in the stacking direction of the battery stack.
《Aspect 6》
The battery laminate according to any one of aspects 1 to 5, which is a lithium ion secondary battery.

According to the present disclosure, it is possible to provide a battery stack that can suppress an increase in internal resistance.

FIG. 1 is a schematic diagram of a battery stack 100 according to a first embodiment of the present disclosure. FIG. 2 is a schematic diagram of a battery stack 200 according to a second embodiment of the present disclosure.

Embodiments of the present disclosure will be described in detail below. Note that the present disclosure is not limited to the following embodiments, but can be implemented with various modifications within the scope of the gist of the disclosure.

The battery laminate of the present disclosure includes a power generation element in which one or more electrode bodies are laminated in this order, in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are laminated in this order; a positive electrode terminal that is electrically connected to the power generating element, a negative electrode terminal that is placed on the side of the power generating element and electrically connected to the negative electrode layer, and a positive electrode metal sputtered layer that is placed between the power generating element and the positive electrode terminal. , and a negative electrode metal sputtered layer disposed between the power generation element and the negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are sintered or fused metal bodies, and is a battery laminate. .

The configuration of the battery laminate includes a power generation element in which one or more electrode bodies are stacked, each of which has a negative electrode layer, a solid electrolyte layer, and a positive electrode layer laminated in this order, and which is electrically connected to the negative electrode layer and which is electrically connected to the negative electrode layer. A conceivable configuration includes a negative electrode terminal disposed on the side surface of the power generating element, and a positive electrode terminal electrically connected to the positive electrode layer and disposed on the side surface of the power generation element.

It can be assumed that a battery stack having such a configuration is used by being fixed onto a base material, for example, a printed circuit board, using solder or the like.

In such a battery stack, from the viewpoint of increasing the structural efficiency of the battery, attempts have been made to provide both the positive and negative terminals and the battery sealing function by sintering or melting metal to the side surface of the power generating element. There are cases where However, when forming a sintered or fused metal body on the side surface of a power generation element, the wettability of the metal powder slurry or molten metal for forming the sintered body to the power generation element is insufficient. As a result, sufficient contact and/or adhesion between the formed positive and negative terminals and the power generation element may not be obtained, and the electrical resistivity of the battery stack may increase. Furthermore, there are cases where the power generation element cannot be sufficiently sealed.

In the battery stack of the present disclosure, a metal sputtered layer is disposed between the power generating element and the positive and negative terminals. A metal sputtered layer formed by a sputtering method can widely adhere to the power generating element and provide high bonding properties even when the power generating element contains a solid electrolyte. In addition, the metal sputtered layer has good wettability with a metal powder slurry or molten metal used to form a sintered or fused metal body. Therefore, in the battery stack of the present disclosure, it is possible to suppress an increase in internal resistance and to achieve high sealing performance of the power generation element.

Here, the battery stack of the present disclosure is particularly useful when the power generation element contains sulfur.

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

The battery stack of the present disclosure is particularly advantageous when the power generating element contains sulfur because it can achieve high sealing performance of the power generating element as described above. However, depending on the material, the positive metal sputtered layer and/or the negative metal sputtered layer may react with sulfur in the power generation element. Therefore, when the power generation element contains sulfur, the positive electrode metal sputter layer and/or the negative electrode metal sputter layer should be made of a material that has low reactivity with sulfur under the usage conditions of the battery stack, such as gold, platinum, nickel, etc. It is particularly preferable that the material is at least one selected from the group consisting of , stainless steel, and stainless steel.

That is, in the battery stack of the present disclosure, the power generation element contains sulfur, and the material of the positive metal sputtered layer and/or the negative metal sputtered layer is selected from the group containing gold, platinum, nickel, or stainless steel. It is particularly preferred that at least one of the following is used.

Note that sulfur can be contained in the sulfide solid electrolyte and/or the sulfur-based active material.

Note that the battery stack of the present disclosure may be a lithium ion secondary battery.

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 a battery stack 100 according to the first embodiment of the present disclosure.

A 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 a battery stack 100 in the stacking direction according to the first embodiment. As shown in FIG. 1, the battery stack 100 according to the first embodiment of the present disclosure includes one or more electrode bodies 114 in which a negative electrode layer 111, a solid electrolyte layer 112, and a positive electrode layer 113 are laminated in this order. It has power generating elements 110 that are individually stacked. The battery stack 100 has 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, and a negative electrode terminal 141 arranged on the side surface of the power generation element 110 and electrically connected to the positive electrode layer 113. It has a positive electrode terminal 142. The negative electrode terminal 141 and the positive electrode terminal 142 are arranged on two opposing sides of the battery stack 100. The battery stack 100 also includes a negative metal sputtered layer 151 disposed between the power generating element 110 and the negative electrode terminal 141 and a positive metal sputtered layer 152 disposed between the power generating element 110 and the positive terminal 142. have. Here, the negative electrode terminal 141 and the positive electrode terminal 142 are sintered or fused metal bodies.

In the battery stack 100 according to the first embodiment of the present disclosure, the exterior body 130 is arranged on both sides of the battery stack 100 in the stacking direction and on two side surfaces (not shown) where external terminals are not arranged, Thereby, the power generating element 110 is sealed by the exterior body 130, the negative electrode terminal 141, and the positive electrode terminal 142.

Furthermore, an insulating electrode end layer 120 is disposed between the negative electrode layer 111 and the exterior body 130 and between the solid electrolyte layers 112 of adjacent electrode bodies 114, so that the negative electrode layer 111 and the exterior body 130, electrical contact between the positive electrode layer 113 and the exterior body 130, between the negative electrode layer 111 and the positive electrode terminal 142, and between the positive electrode layer 113 and the negative electrode terminal 141 is suppressed.

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

In the present disclosure, the electrode body includes a negative electrode layer, a solid electrolyte layer, and a positive electrode layer stacked in this order.

A battery stack includes a power generation element in which one or more electrode bodies are stacked, particularly a power generation element in which a plurality of electrode bodies are stacked in a monopolar structure. Here, 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 generation element in which a plurality of electrode bodies are stacked, the stacking direction of each electrode body in the battery stack is equal to the stacking direction of the negative electrode layer, solid electrolyte layer, and positive electrode layer in the electrode body.

The power generation element contains sulfur. Here, sulfur can be contained, for example, in the sulfide solid electrolyte and/or the sulfur-based active material. Sulfur may be contained in any of the negative electrode layer, solid electrolyte layer, and positive electrode layer of the electrode body.

The sulfide solid electrolyte may be, for example, a sulfide-based amorphous solid electrolyte, a sulfide-based crystalline solid electrolyte, an argyrodite solid electrolyte, or the like. More specifically, sulfide solid electrolytes include Li ₂ SP ₂ S ₅ type (Li ₇ P ₃ S ₁₁ , Li ₃ PS ₄ , Li ₈ P ₂ S ₉ etc.), Li ₂ S-SiS ₂ , LiI-Li ₂ S-SiS ₂ , LiI-Li ₂ SP ₂ S ₅ , LiI-LiBr-Li ₂ SP ₂ S ₅ , Li ₂ SP ₂ S ₅ -GeS ₂ (Li ₁₃ GeP ₃ S ₁₆ , Li ₁₀ GeP ₂ S ₁₂ etc.), LiI-Li ₂ SP ₂ O ₅ , LiI-Li ₃ PO ₄ -P ₂ S ₅ , Li _7-x PS _6-x Cl _x etc.; or these Examples include, but are not limited to, combinations.

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 (Li ₂ S), and lithium polysulfide (Li ₂ S _x , 2≦x≦8).

<Negative electrode layer>
For example, the negative electrode layer may have a structure in which a negative electrode current collector layer and a negative electrode active material layer are stacked on each other, and in this case, the negative electrode terminal is electrically connected to the negative electrode current collector layer. I can be there. Note that the negative electrode layer does not need to have a negative electrode current collector layer, and in this case, the negative electrode terminal can be electrically connected by directly contacting the negative electrode active material layer.

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

The negative electrode active material may be, for example, a material capable of inserting and releasing metal ions such as lithium ions. As a material capable of intercalating and releasing metal ions such as lithium ions, the negative electrode active material may be, for example, an alloy negative electrode active material or a carbon material, but is not limited thereto.

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

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

The solid electrolyte is not particularly limited, and any material that can be used as a solid electrolyte for all-solid-state batteries can be used. More specifically, solid electrolytes include, for example, sulfide solid electrolytes, oxide solid electrolytes, nitride solid electrolytes, and polymer electrolytes.

Examples of the sulfide solid electrolyte include, but are not limited to, a sulfide-based amorphous solid electrolyte, a sulfide-based crystalline solid electrolyte, and an argyrodite solid electrolyte. Specific examples of sulfide solid electrolytes include Li ₂ SP ₂ S ₅ type (Li ₇ P ₃ S ₁₁ , Li ₃ PS ₄ , Li ₈ P ₂ S _9, etc.), Li ₂ S-SiS ₂ , LiI -Li ₂ S-SiS ₂ , LiI-Li ₂ SP ₂ S ₅ , LiI-LiBr-Li ₂ SP ₂ S ₅ , Li ₂ SP ₂ S ₅ -GeS ₂ (Li ₁₃ GeP ₃ S ₁₆ , Li ₁₀ GeP ₂ S ₁₂ etc.), LiI-Li ₂ SP ₂ O ₅ , LiI-Li ₃ PO ₄ -P ₂ S ₅ , Li _7-x PS _6-x Cl _x etc.; or a combination thereof. These include, but are not limited to:

Examples of oxide solid electrolytes include Li ₇ La ₃ Zr ₂ O _12, Li _7-x La ₃ Zr _1-x Nb _x O _12, Li _7-3x La ₃ Zr ₂ Al _x O ₁₂ , Li _3x La _{2/ 3-x} TiO ₃ , Li _1+x Al _x Ti _2-x (PO ₄ ) ₃ , Li _1+x Al _x Ge _2-x (PO ₄ ) ₃ , Li ₃ PO ₄ , or Li _3+x PO _{4 -x} N _x (LiPON), etc., but are not limited to these.

The sulfide solid electrolyte, oxide solid electrolyte, and nitride solid electrolyte may be glass, glass ceramics, or crystalline materials. Glass can be obtained by amorphizing a raw material composition (for example, a mixture of Li ₂ S and P ₂ S ₅ ). Examples of the amorphous treatment include mechanical milling. Mechanical milling may be dry mechanical milling or wet mechanical milling, but the latter is preferred. This is because it is possible to prevent the raw material composition from sticking to the wall surface of the container or the like. Moreover, glass ceramics can be obtained by heat-treating glass. Further, the crystalline material can be obtained, for example, by subjecting a raw material composition to a solid phase reaction treatment.

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

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

As the conductive auxiliary material, known materials can be used, such as carbon materials, metal particles, and the like. Examples of the carbon material include at least one selected from the group consisting of carbon black such as acetylene black and furnace black, vapor grown carbon fiber (VGCF), carbon nanotubes, and carbon nanofibers, among which, From the viewpoint of electron conductivity, at least one selected from the group consisting of VGCF, carbon nanotubes, and carbon nanofibers may be used. Examples of metal particles include particles of nickel, copper, iron, stainless steel, and the like.

(Negative electrode current collector layer)
The material used for the negative electrode current collector layer may be stainless steel (SUS), aluminum, copper, nickel, iron, titanium, carbon, or the like, but is not limited thereto. Among these, the material of the negative electrode current collector layer is preferably copper.

The shape of the negative electrode current collector layer is not particularly limited, and for example, a foil-like, plate-like, or mesh-like electronically conductive material, or a layer-shaped material formed from an electronically conductive material powder and a binder is used. can be mentioned. Among these, foil-like electronically conductive materials are preferred.

<Solid electrolyte layer>
The solid electrolyte layer may contain a solid electrolyte and optionally a binder.

As the solid electrolyte and binder, those described in connection with the above "(negative electrode active material layer)" can be appropriately employed.

<Positive electrode layer>
The positive electrode layer may have, for example, a structure in which a positive electrode current collector layer and a positive electrode active material layer are stacked on each other, and in this case, the positive electrode terminal is electrically connected to the positive electrode current collector layer. I can be there. Note that the positive electrode layer does not need to have a positive electrode current collector layer, and in this case, the positive electrode terminal can be electrically connected by directly contacting the positive electrode active material layer.

(Positive electrode active material layer)
The positive electrode active material layer contains a positive electrode active material and optionally a solid electrolyte. In addition, it may contain additives used in the positive electrode active material layer of lithium ion batteries, such as a conductive additive or a binder, depending on the purpose of use and the like.

Examples of positive electrode active materials include lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), lithium manganate (LiMn ₂ O ₄ ), LiCo _1/3 Ni _1/3 Mn _1/3 O ₂ , Li _{1+ x} Mn _2-xy M _y O ₄ (M is one or more metal elements selected from Al, Mg, Co, Fe, Ni, and Zn) with different element substitution Li-Mn spinel, etc. There may be, but it is not limited to these.

Moreover, 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 (Li ₂ S), and lithium polysulfide (Li ₂ S _x , 2≦x≦8).

As the solid electrolyte, conductive aid, and binder, those described in connection with the above "(negative electrode active material layer)" can be appropriately employed.

(Positive electrode current collector layer)
The material used for the positive electrode current collector layer may be stainless steel (SUS), aluminum, copper, nickel, iron, titanium, carbon, or the like, but is not limited thereto. Among these, the material of the positive electrode current collector layer is preferably aluminum.

The shape of the positive electrode current collector layer is not particularly limited, and examples thereof include foil-like, plate-like, or mesh-like electron conductive materials. Examples include layered materials formed from electronically conductive material powder and a binder. Among these, foil-like electronically conductive materials are preferred.

《Negative terminal and positive terminal》
The battery stack of the present disclosure includes a positive electrode terminal disposed on the side surface of the power generation element and electrically connected to the positive electrode layer, and a positive electrode terminal disposed on the side surface of the power generation element and electrically connected to the negative electrode layer. It has a negative terminal. Here, the positive electrode terminal and the negative electrode terminal are sintered or fused metal bodies.

Here, the sintered body of metal is a sintered body of metal, for example, metal powder. A metal sintered body is formed by heating and sintering a metal, such as a metal powder. Furthermore, a metal fusion bond is formed by melting and solidifying metals.

The metals that can be used for the negative and positive terminals can be any metal that can be sintered or fused to form the terminals of the battery.

Examples of such metals include Pb and Sn alloys. Examples of Sn alloys include alloys of Sn and Au or Ni.

When the power generation element contains sulfur, especially when it contains a sulfide solid electrolyte, the metal used for the negative and positive terminals must be any metal or metal alloy with a melting point of 260°C or higher. is preferred.

Since such a metal has a melting point of 260° C. or higher, the melting point is higher than the general heating temperature in a solder reflow process used for bonding a battery stack to a printed circuit board or the like. Therefore, it is possible to suppress melting of the external terminals when bonding the battery stack to a printed circuit board or the like. Melting of the external terminals may cause problems such as lowering the sealing performance of the battery stack in some cases.

In addition, if the power generation element contains sulfur, especially if it contains a sulfide solid electrolyte, any metal or metal alloy with a melting point of 300°C or less may be used as the metal used for the negative and positive terminals. It is preferable to do so. This is because the external terminal can be formed by melting at a temperature lower than the reaction temperature of sulfur that can be used in power generation elements. This makes it possible to suppress an increase in the internal resistance of the battery stack due to the reaction of sulfur in the power generation element during production of the battery stack.

The melting point of the metal that can be used for the negative and positive terminals may be 260°C or higher, 265°C or higher, 270°C or higher, or 275°C or higher, and may be 300°C or lower, 295°C or lower, 290°C or lower, or 285°C. or below, or below 280°C.

The negative electrode terminal and the positive electrode terminal can extend to at least one end surface in the stacking direction of the battery stack. When the battery stack has such a configuration, the circuit on the printed board and the battery stack can be bonded by fixing the printed circuit board to the end face where the negative and positive terminals extend, for example, by soldering. and can be electrically connected.

More specifically, as shown in FIG. 1, the negative electrode terminal 141 and the positive electrode terminal 142 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). I can be there.

《Negative metal sputtered layer and positive metal sputtered layer》
The battery stack of the present disclosure includes a positive metal sputtered layer disposed between the power generating element and the positive electrode terminal, and a negative metal sputtered layer disposed between the power generating element and the negative electrode terminal.

The positive metal sputtered layer and/or the negative metal sputtered layer can be formed by a sputtering method such as a DC sputtering method, an RC sputtering method, a magnetron sputtering method, an ion beam sputtering method, or the like.

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

Since such a metal has a melting point of 260° C. or higher, the melting point is higher than the general heating temperature in a solder reflow process used for bonding a battery stack to a printed circuit board or the like. Therefore, it is possible to suppress melting of the positive electrode metal sputter layer and/or the negative electrode metal sputter layer when bonding 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 cause problems such as deterioration of the sealing performance of the battery stack depending on the case.

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

Note that the material for 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 for the negative electrode terminal and the positive electrode terminal.

The positive electrode metal sputter layer and/or the negative electrode metal sputter layer can extend to at least one end surface in the stacking direction of the battery stack. When the battery stack has such a configuration, even in a configuration in which the negative terminal and the positive terminal extend to at least one end face in the stacking direction of the battery stack, the battery stack of the negative terminal and the positive terminal It is possible to improve the adhesion to.

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

《Exterior body》
In the battery stack of the present disclosure, it is preferable that the power generating element is sealed by the exterior body, the negative electrode terminal, and the positive electrode terminal.

Here, the exterior body may be made of any material capable of sealing the power generation element, such as resin or ceramics.

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

Claims (6)

A power generation element in which one or more electrode bodies are laminated in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are laminated in this order;
a positive electrode terminal disposed on a side surface of the power generation element and electrically connected to the positive electrode layer;
a negative electrode terminal disposed on a side surface of the power generation element and electrically connected to the negative electrode layer;
a positive electrode metal sputtered layer disposed between the power generation element and the positive electrode terminal; and a negative electrode metal sputtered layer located between the power generation element and the negative electrode terminal.
It has
The positive electrode terminal and the negative electrode terminal are a sintered body or a fused metal body,
Battery laminate. The battery stack according to claim 1, wherein the material of the positive electrode metal sputter layer and/or the negative electrode metal sputter layer is a metal having a melting point of 260° C. or higher. The power generation element contains sulfur,
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, or stainless steel.
The battery laminate according to claim 1. The battery stack according to claim 3, wherein the sulfur is contained in a sulfide solid electrolyte and/or a sulfur-based active material. The battery stack according to claim 1, wherein the positive electrode terminal and the negative electrode terminal extend to at least one end surface in the stacking direction of the battery stack. The battery stack according to claim 1, which is a lithium ion secondary battery.

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