Electrode stack module

Abstract

This disclosure aims to provide an electrode laminate module that is lightweight while suppressing moisture permeation into the electrode laminate. [Solution] The electrode stack module 100 of the present disclosure comprises a plurality of electrode stacks 200, a metal foil 220, and a metal vapor-deposited resin layer 240, wherein each of the plurality of electrode stacks 200 includes at least a first active material layer 200a, a separator layer 200b, and a second active material layer 200c in this order, the first active material layer 200a of each of the plurality of electrode stacks 200 is in contact with the metal foil 220, thereby electrically connecting the plurality of first active material layers 200a in parallel with each other, the second active material layer 200c of each of the plurality of electrode stacks 200 is in contact with the vapor-deposited metal film of the metal vapor-deposited resin layer 240, thereby electrically connecting the plurality of second active material layers 200c in parallel with each other, and the metal foil 220 is folded or wound so that it faces outward.

Description

[Technical Field]

[0001] This disclosure relates to an electrode stack module. [Background technology]

[0002] An electrode stack module is an electrode stack containing at least a positive electrode active material layer and a negative electrode active material layer, housed in an outer casing or the like. In recent years, electrode stack modules, i.e., foldable batteries, have been studied, which have multiple electrode stacks, each of which is electrically connected, and which have sections between the multiple electrode stacks where no electrode stacks are placed. Such foldable batteries have advantages such as the ability to easily adjust the capacity of the electrode stack module to any value by cutting it in the section where no electrode stacks are placed, and the ability to miniaturize the electrode stack module by folding it in the section where no electrode stacks are placed.

[0003] For example, Patent Document 1 discloses a battery characterized in that a battery element is arranged between opposing flat, non-porous positive electrode current collectors and negative electrode current collectors, each consisting of an internal positive electrode current collector made of a resin film having a metal coating layer holding positive electrode active material, a separator, and an internal negative electrode current collector made of a resin film having a metal coating layer holding negative electrode active material. At least a portion of the ends of the metal coating layers is electrically connected to the inner surface of the corresponding electrode's outer casing, and the peripheral area of ​​the outer casing is sealed with a sealing material that also serves as electrical insulation, thereby creating an airtight seal inside the battery. The battery described in Patent Document 1 is said to meet market demands such as being lightweight, small, thin, high capacity, long lifespan, and low cost.

[0004] Furthermore, Patent Document 2 discloses a flexible battery comprising a first substrate, a second substrate, a first unit cell arranged between the first and second substrates in the longitudinal direction of the first and second substrates, and a second unit cell, wherein the first and second unit cells are electrically interconnected. The flexible battery described in Patent Document 2 is said to be in the form of a thin film and easily bendable. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-169453 [Patent Document 2] Japanese Patent Publication No. 2017-33912 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In order to reduce the weight of batteries, conventional flexible batteries use a resin film with a metal coating layer as the positive electrode current collector and / or negative electrode current collector, which hold the positive electrode active material layer and / or negative electrode active material layer. Considering the permeation of moisture into the electrode stack, it was necessary to house it in an outer casing.

[0007] Therefore, the purpose of this disclosure is to provide an electrode laminate module that is lightweight while suppressing moisture permeation into the electrode laminate. [Means for solving the problem]

[0008] This disclosure aims to achieve the above objectives by the following means:

[0009] (Aspect 1) It comprises multiple electrode stacks, metal foil, and a metal vapor-deposited resin layer, Each of the above-mentioned electrode stacks includes, at least, a first active material layer, a separator layer or a solid electrolyte layer, and a second active material layer, in this order. Each of the first active material layers of the above-mentioned plurality of electrode stacks is in contact with the metal foil, thereby electrically connecting the plurality of first active material layers in parallel with one another. Each of the above-mentioned multiple electrode stacks has a second active material layer in contact with the deposited metal film of the metal-deposited resin layer, thereby electrically connecting the multiple second active material layers to one another in parallel. When viewed from the lamination direction of the metal foil and the metal vapor deposition resin layer, each of the plurality of electrode laminate bodies has a sealing portion sealed by a resin sealing member surrounding the peripheral portions of the metal foil, the metal vapor deposition resin layer, and the electrode laminate body, and a non-sealing portion other than the sealing portion, and The metal foil is folded or wound so as to face the outer surface. Electrode laminate module. (Aspect 2) The electrode laminate module according to Aspect 1, wherein in the non-sealing portion, the metal foil and the metal vapor deposition resin layer are folded so that the metal foil faces the outer surface by bending the metal foil and the metal vapor deposition resin layer. (Aspect 3) When viewed from the lamination direction of the electrode laminate body, the dimensions of the separator layer or the solid electrolyte layer, and the dimension of one of the first and second active material layers are larger than the dimension of the other of the first and second active material layers, and The resin sealing member is in contact with the peripheral portion of the separator layer or the solid electrolyte layer, and / or the peripheral portion of one of the first and second active material layers, and is not in contact with the peripheral portion of the other of the first and second active material layers. The electrode laminate module according to Aspect 1 or 2. (Aspect 4) The electrode laminate module according to any one of Aspects 1 to 3, wherein in the non-sealing portion, the vapor-deposited metal film and the metal foil do not overlap when viewed from the lamination direction of the metal foil and the metal vapor deposition resin layer. (Aspect 5) The electrode laminate module according to any one of Aspects 1 to 4, wherein the thickness of the vapor-deposited metal film is 1.0 μm or less.

Advantages of the Invention

[0010] According to the present disclosure, it is possible to provide an electrode laminate module that suppresses moisture permeation into the electrode laminate and achieves weight reduction.

Brief Description of the Drawings

[0011] [Figure 1]Figure 1 is a schematic diagram illustrating the electrode stack module of this disclosure. [Figure 2] Figure 2 is a schematic diagram illustrating a conventional electrode stack module. [Figure 3] Figure 3 is a schematic diagram illustrating the electrode stack module of this disclosure. [Figure 4] Figure 4 is an image of the electrode stack module of the present disclosure in Example 1. [Figure 5] Figure 5 is a schematic diagram illustrating Example 1. [Modes for carrying out the invention]

[0012] The embodiments of this disclosure will be described in detail below. However, this disclosure is not limited to the embodiments described below, and can be implemented in various ways within the scope of the gist of this disclosure. Furthermore, in the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0013] ≪Electrode Stack Module≫ The electrode stack module disclosed herein is It comprises multiple electrode stacks, metal foil, and a metal vapor-deposited resin layer, Each of the above-mentioned electrode stacks includes, at least, a first active material layer, a separator layer or a solid electrolyte layer, and a second active material layer, in this order. Each of the first active material layers of the above-mentioned plurality of electrode stacks is in contact with the metal foil, thereby electrically connecting the plurality of first active material layers in parallel with one another. Each of the above-mentioned multiple electrode stacks has a second active material layer in contact with the deposited metal film of the metal-deposited resin layer, thereby electrically connecting the multiple second active material layers to one another in parallel. When viewed from the lamination direction of the metal foil and the metal vapor-deposited resin layer, each of the multiple electrode stacks has a sealed portion and an unsealed portion other than the sealed portion, and the metal foil, the metal vapor-deposited resin layer, and the resin sealing member surrounding the peripheral edge of the electrode stack have a sealed portion and an unsealed portion other than the sealed portion, The above metal foil is folded or rolled up so that the outer surface faces outwards.

[0014] The electrode stack module described above allows for weight reduction while suppressing moisture permeation into the electrode stack.

[0015] As shown in Figure 2, the electrode stack module comprises multiple electrode stacks 200, sealing members 260 surrounding each of the multiple electrode stacks 200, and two metal-deposited resin layers 240. The multiple electrode stacks 200 are sealed by the sealing members 260 and the two metal-deposited resin layers 240, thereby reducing the weight of the electrode stack module. However, since the metal-deposited resin layers 240 have low gas barrier properties, they cannot suppress moisture permeation into the multiple electrode stacks 200. Therefore, it was considered to suppress moisture permeation into the multiple electrode stacks 200 by housing the electrode stack module in an outer casing after folding it, but this may lead to an increase in the number of parts in the electrode stack module and an increase in the mass of the electrode stack module.

[0016] In contrast, the electrode stack module of this disclosure comprises a plurality of electrode stacks, a sealing member surrounding each of the plurality of electrode stacks, a metal foil, and a metal-deposited resin layer, and the metal foil is folded or wound so that it faces outward. Because a metal-deposited resin layer is provided, the electrode stack module can be made lighter, and because the electrode stack module is folded so that the metal foil, which has high gas barrier properties, faces outward, moisture permeation into the electrode stack can be suppressed. The electrode stack module of this disclosure can be housed in an outer casing to further suppress moisture permeation, or it can be used as is without being housed in an outer casing.

[0017] One embodiment of the present disclosure is shown in Figures 1 and 3, but the present disclosure is not limited thereto. The electrode stack module 100 comprises a plurality of electrode stacks 200, a sealing member 260 surrounding each of the plurality of electrode stacks 200, a metal foil 220, and a metal vapor-deposited resin layer 240, and the electrode stack module 100 is folded so that the metal foil 220 faces outward. This makes it possible to reduce the weight of the electrode stack module 100 by including the metal vapor-deposited resin layer 240 while suppressing moisture permeation into the electrode stack.

[0018] In this disclosure, the electrode stack module has a sealed portion and an unsealed portion. In the sealed portion, each of the multiple electrode stacks is sealed by a metal foil, a metal vapor-deposited resin layer, and a resin sealing member surrounding the periphery of the electrode stack. In the unsealed portion, the electrode stack module may be folded by bending the metal foil and the metal vapor-deposited resin layer. In this case, "sealing" means sealing the internal space, which suppresses the permeation of moisture from the external space to the internal space.

[0019] In this disclosure, the electrode stack module may be housed in an outer casing or the like while in a folded state. Examples of outer casings include, but are not limited to, polypropylene (PP) and epoxy resin.

[0020] <Electrode Laminate> In this disclosure, a plurality of electrode stacks are provided in an electrode stack module, and each of the plurality of electrode stacks includes at least a first active material layer, a separator layer or a solid electrolyte layer, and a second active material layer, in this order.

[0021] In this disclosure, each first active material layer of a plurality of electrode stacks is in contact with a metal foil, thereby electrically connecting the plurality of first active material layers in parallel, and each second active material layer of a plurality of electrode stacks is in contact with a deposited metal film of a metal-deposited resin layer, thereby electrically connecting the plurality of second active material layers in parallel.

[0022] In this disclosure, the electrode stack may be a liquid-based electrode stack or a solid-electrode stack. In this disclosure, "liquid-based electrode stack" means a battery that uses an electrolyte solution as the electrolyte, and "solid-electrode stack" means a battery that uses at least a solid electrolyte as the electrolyte; therefore, the solid-electrode stack uses a combination of a solid electrolyte and a liquid electrolyte as the electrolyte.

[0023] In this disclosure, the shape of the electrode stack when viewed from the stacking direction is not particularly limited, but examples include triangles, squares, hexagons, circles, etc.

[0024] (First and second active material layers) In this disclosure, the electrode stack includes an active material layer. Specifically, each of a plurality of electrode stacks includes a first and a second active material layer.

[0025] In this disclosure, the active material layer comprises at least an active material. The active material layer may further optionally contain an electrolyte, a conductive additive, and a binder. The respective content of the active material, electrolyte, conductive additive, and binder in the active material layer may be appropriately determined according to the desired battery performance. For example, the content of the active material may be 40% by mass or more, 50% by mass or more, or 60% by mass or more, or 100% by mass or less, or 90% by mass or less, with the entire active material layer being 100% by mass.

[0026] In this disclosure, "active material" may be either a "positive electrode active material" or a "negative electrode active material." For example, if the first active material layer contains a positive electrode active material, the second active material layer may contain a negative electrode active material, and if the first active material layer contains a negative electrode active material, the second active material layer may contain a positive electrode active material.

[0027] The material of the positive electrode active material is not particularly limited. Examples of the positive electrode active material include lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium manganate (LiMn2O4), LiNiCoMn, lithium nickel cobalt manganate (NCM:LiCO 1 / 3 Ni 1 / 3 Mn 1 / 3 O2), lithium nickel cobalt aluminum oxide (LiNi 0.8 (CoAl) 0.2 O2), Li 1+x Mn 2-x-y M y O4 (M is one or more metal elements selected from Al, Mg, Co, Fe, Ni, and Zn), such as hetero-element substituted Li-Mn spinel having a composition represented by the formula, but is not limited thereto.

[0028] The material of the negative electrode active material is not particularly limited. The negative electrode active material may be, for example, metallic lithium, or a material capable of occluding and releasing metal ions such as lithium ions. Examples of the material capable of occluding and releasing metal ions such as lithium ions include alloy-based negative electrode active materials, carbon materials, lithium titanate (Li4Ti5O 12 ) and the like, but are not limited thereto.

[0029] The alloy-based negative electrode active material is not particularly limited, and examples thereof include Si alloy-based negative electrode active materials or Sn alloy-based negative electrode active materials. The Si alloy-based negative electrode active material includes silicon, silicon oxide, silicon carbide, silicon nitride, or the like, or a solid solution thereof. Further, the Si alloy-based negative electrode active material may contain a metal element other than silicon, such as iron, cobalt, antimony, bismuth, lead, nickel, copper, zinc, germanium, indium, tin, titanium, or the like. The Sn alloy-based negative electrode active material includes tin, tin oxide, tin nitride, or the like, or a solid solution thereof. Further, the Sn alloy-based negative electrode active material may contain a metal element other than tin.

[0030] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0031] The shape of the active material is not particularly limited and may be particulate, for example. If the active material is particulate, the particle size D of the active material 50 For example, the particle size D may be 1 nm or more, 5 nm or more, or 10 nm or more, and may also be 500 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. 50 This is the particle diameter (median diameter) at 50% of the integrated value in the volume-based particle size distribution determined by laser diffraction and scattering.

[0032] In this disclosure, the solid electrolyte optionally included in the active material layer is selected according to the form of the secondary battery. The solid electrolyte may be one known as a solid electrolyte for secondary batteries. Examples of solid electrolytes include inorganic solid electrolytes such as sulfide solid electrolytes, oxide solid electrolytes, and halide solid electrolytes, and organic polymer electrolytes such as polymer electrolytes. From the viewpoint of heat resistance, sulfide solid electrolytes and oxide solid electrolytes are particularly preferred. The solid electrolyte may be in particulate form, for example. Only one type of solid electrolyte may be used alone, or two or more types may be used in combination.

[0033] Examples of sulfide solid electrolytes include solid electrolytes containing Li, X (where X is at least one of P, As, Sb, Si, Ge, Sn, B, Al, Ga, and In), and S. The sulfide solid electrolyte may further contain at least one of O and halogen elements. Examples of halogen elements include F, Cl, Br, and I. The sulfide solid electrolyte may be made of glass (amorphous) or glass ceramics. Examples of sulfide solid electrolytes include, but are not limited to, Li2S-P2S5, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-SiS2, Li2S-GeS2, and Li2S-P2S5-GeS2.

[0034] As an oxide solid electrolyte, Li7La3Zr2O 12 Li 7-x La3Zr1-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 Examples include (LiPON), but are not limited to these. The oxide solid electrolyte may be amorphous or crystalline.

[0035] Examples of halogen solid electrolytes include NaBH4 and NaB 10 H 10 NaCB9H 10 NaCB 11 H 12 NaB 12 Cl 12 These are some examples, but are not limited to them.

[0036] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0037] In this disclosure, the content of the solid electrolyte in the active material layer is not particularly limited, but may be 1.0% by mass or more, 5.0% by mass or more, 10.0% by mass or more, or 13.0% by mass or more, and may be 60.0% by mass or less, 50.0% by mass or less, 40.0% by mass or less, or 30.0% by mass or less.

[0038] In this disclosure, the conductive additive optionally included in the active material layer may be one known as a conductive additive used in secondary batteries. Specifically, examples of conductive additives include carbon materials such as Ketjenblack (KB), vapor-processed carbon fiber (VGCF), acetylene black (AB), carbon nanotubes (CNT), carbon nanofibers (CNF), carbon black, coke, and graphite. The conductive additive may also be a metallic material that can withstand the environment in which the battery is used. The conductive additive may be used alone or in combination of two or more types. The conductive additive may be in various forms such as powder or fiber.

[0039] In this disclosure, the content of the conductive additive in the active material layer is not particularly limited, but may be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, or 3.0% by mass or more, and may be 20.0% by mass or less, 15.0% by mass or less, 10.0% by mass or less, or 8.0% by mass or less.

[0040] In this disclosure, the binder optionally included in the active material layer may be one known as a binder used in secondary batteries. Examples of binders include styrene-butadiene rubber (SBR), carboxymethylcellulose (CMC), acrylonitrile-butadiene rubber (ABR), butadiene rubber (BR), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE). One type of binder may be used alone, or a combination of two or more types may be used.

[0041] In this disclosure, the binder content in the active material layer is not particularly limited, but may be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, or 3.0% by mass or more, and may be 20.0% by mass or less, 10.0% by mass or less, or 8.0% by mass or less.

[0042] (Separator layer) In this disclosure, each of the multiple electrode stacks may include a separator layer. Specifically, when the electrode stack is a liquid-based electrode stack, the electrode stack may include a separator layer.

[0043] In this disclosure, the separator layer may be any separator commonly used in secondary batteries, such as those made of butadiene rubber (BR), polyethylene (PE), polypropylene (PP), polyester, and polyamide resins. The separator layer may be a single-layer structure or a multi-layer structure. Examples of multi-layer separator layers include a two-layer PE / PP separator layer, or a three-layer PP / PE / PP or PE / PP / PE separator layer. The separator layer may be made of a nonwoven fabric such as a cellulose nonwoven fabric, a resin nonwoven fabric, or a glass fiber nonwoven fabric. In this disclosure, the separator layer may further contain a solid electrolyte.

[0044] In this disclosure, when viewed from the stacking direction of the electrode stack, the dimensions of the separator layer may be larger than the dimensions of the first or second active material layer. In this disclosure, "larger dimensions" means that when the two shapes are superimposed, one shape encompasses the other shape.

[0045] (Solid electrolyte layer) In this disclosure, each of the multiple electrode stacks may include a solid electrolyte layer. In this disclosure, the solid electrolyte layer includes at least a solid electrolyte. Details of the solid electrolyte included in the solid electrolyte layer of this disclosure can be found in the above description relating to the active material layer of this disclosure.

[0046] In this disclosure, the dimensions of the solid electrolyte layer may be larger than the dimensions of the first or second active material layer when viewed from the stacking direction of the electrode stack.

[0047] <Metal foil> In this disclosure, the electrode stack module comprises metal foil, and the electrode stack module is folded or rolled up such that the metal foil faces outward.

[0048] In this disclosure, the material of the metal foil is not particularly limited as long as it has gas barrier properties, but examples include copper, nickel, chromium, gold, platinum, silver, aluminum, iron, titanium, zinc, cobalt, stainless steel, and aluminum alloys. In particular, the material of the metal foil when connected to an active material layer containing a positive electrode active material may contain aluminum from the viewpoint of ensuring oxidation resistance, etc.

[0049] In this disclosure, the thickness of the metal foil may be 3 μm or more, 5 μm or more, or 10 μm or more, and may be 100 μm or less, 80 μm or less, or 50 μm or less.

[0050] <Metal-deposited resin layer> In this disclosure, the electrode laminate module comprises a metal-deposited resin layer. The metal-deposited resin layer comprises at least a resin layer and a deposited metal film.

[0051] The resin layer of the metal-deposited resin layer is not particularly limited, but from the viewpoint of heat resistance, polyethylene terephthalate (PET), polypropylene (PP), etc. are preferred.

[0052] In this disclosure, the thickness of the resin layer is not particularly limited, but may be 0.1 μm or more, 0.3 μm or more, 0.5 μm or more, 1.0 μm or more, 3.0 μm or more, or 5.0 μm or more, and may also be 100.0 μm or less, 80.0 μm or less, 60.0 μm or less, 30.0 μm or less, 10.0 μm or less, 8.0 μm or less, or 5.0 μm or less.

[0053] The vapor-deposited metal film is not particularly limited, but examples include copper, nickel, chromium, gold, platinum, silver, aluminum, iron, titanium, zinc, cobalt, stainless steel, and aluminum alloys, and is preferably one that has reduction resistance.

[0054] In this disclosure, the thickness of the vapor-deposited metal film is not particularly limited, but may be 1 nm or more, 3 nm or more, 10 nm or more, 50 nm or more, or 100 nm or more, and may be 1.0 μm or less, 800 nm or less, 500 nm or less, 300 nm or less, or 150 nm or less.

[0055] In this disclosure, the electrode laminate module does not need to have the deposited metal film and the metal foil overlapping in the unsealed portion when viewed from the lamination direction of the metal foil and the metal vapor-deposited resin layer. For example, as shown in Figure 4, in the electrode laminate module 100, the metal vapor-deposited resin layer 240, which includes the deposited metal film, and the metal foil 220 do not need to overlap in the unsealed portion when viewed from the lamination direction of the metal foil 220 and the metal vapor-deposited resin layer 240. This makes it possible to suppress contact between the deposited metal film and the metal foil in the unsealed portion when the electrode laminate module is bent in the unsealed portion.

[0056] <Resin encapsulating material> In this disclosure, the resin sealing member is arranged on the periphery of the electrode stack, and each of the multiple electrode stacks is sealed by the resin sealing member, metal foil, and metal vapor-deposited resin layer.

[0057] In this disclosure, the resin encapsulant is not particularly limited as long as it is a resin that can be welded to a metal. Examples of resin encapsulants include, but are not limited to, thermoplastic films containing polypropylene (PP).

[0058] In this disclosure, the shape and position of the resin encapsulating member are not particularly limited, as long as it encapsulates each of the plurality of electrode stacks. That is, for example, the resin encapsulating member may be in contact with the first active material layer, the separator layer or the solid electrolyte layer and / or the second active material layer, and the peripheral edge of the resin encapsulating member may be in direct contact with the vapor-deposited metal film and / or metal foil.

[0059] Furthermore, in this disclosure, when viewed from the stacking direction of the electrode stack, the dimensions of the separator layer or solid electrolyte layer and the dimensions of the negative electrode active material layer are larger than the dimensions of the positive electrode active material layer, and the resin sealing member is in contact with the peripheral edge of the separator layer or solid electrolyte layer and / or the peripheral edge of the negative electrode active material layer, but does not have to be in contact with the peripheral edge of the positive electrode active material layer.

[0060] The present disclosure will be further described with reference to the following embodiments, but the scope of the present disclosure is not limited to these embodiments. [Examples]

[0061] ≪Example 1≫ (Fabrication of electrode stacks) A positive electrode composite material was prepared containing LiNiCoMn as the positive electrode active material, LiI-LiBr-Li2S-P2S5 as the solid electrolyte, vapor-phase carbon fiber as a conductive additive, and butadiene rubber as a binder. Similarly, a negative electrode composite material was prepared containing graphite as the negative electrode active material, LiI-LiBr-Li2S-P2S5 as the solid electrolyte, vapor-phase carbon fiber as a conductive additive, and butadiene rubber as a binder.

[0062] Four electrode laminates were fabricated, each comprising a separator layer, which is a mixture of a solid electrolyte and butadiene rubber, with a positive electrode composite material coated on one side and a negative electrode composite material coated on the other side, forming a first active material layer and a second active material layer, respectively.

[0063] (Sealing of electrode stacks and fabrication of electrode stack modules) Aluminum foil was prepared as the metal foil, and polyethylene terephthalate film with copper deposited on it was prepared as the metal vapor deposition resin.

[0064] Four electrode stacks were arranged so that the first active material layer and the metal foil were in contact, and the second active material layer and the deposited metal of the metal vapor deposition resin were in contact. A thermoplastic film containing polypropylene was placed around each of the four electrode stacks. Subsequently, the electrode stack modules were fabricated by heating under reduced pressure at 150°C for 1 minute. At this time, the electrode stacks were sealed by the thermoplastic film, metal foil, and metal vapor deposition resin.

[0065] (Folding of the electrode stack module) The electrode stack module was folded. As shown in Figure 3, the cross-sectional view of the folded electrode stack module showed the metal foil facing outwards.

[0066] (Housing of electrode stack modules) As shown in Figure 5, the upper and lower surfaces of the electrode stack in the stacking direction were covered with a polypropylene film 500, and the periphery was covered with an epoxy resin 520, thereby covering a portion of the periphery of the folded electrode stack module.

[0067] <Example 2> An electrode laminate was fabricated by coating one side of a separator layer with a positive electrode composite material and the other side with a negative electrode composite material, respectively, to form a second active material layer and a first active material layer. An electrode laminate module of Example 2 was fabricated in the same manner as in Example 1, except that copper foil was used as the metal foil and aluminum vapor-deposited polyethylene terephthalate film was used as the metal vapor deposition resin.

[0068] <Rating> We confirmed that weight reduction was achieved in the electrode stack modules of Example 1 and Example 2. The electrode stack module of Example 1, in particular, showed a significant weight reduction effect. [Explanation of Symbols]

[0069] 100 Electrode Stack Module 200 electrode stack 200a First active material layer 200b Separator layer 200c Second active material layer 220 Metal Foil 240 Metal vapor deposited resin layer 260 Sealing member 500 Polypropylene Film 520 Epoxy resin

Claims

1. It comprises multiple electrode stacks, metal foil, and a metal vapor-deposited resin layer, Each of the plurality of electrode stacks comprises at least a first active material layer, a separator layer or a solid electrolyte layer, and a second active material layer, in this order. Each of the first active material layers of the plurality of electrode stacks is in contact with the metal foil, thereby electrically connecting the plurality of first active material layers in parallel. Each of the second active material layers of the plurality of electrode stacks is in contact with the deposited metal film of the metal deposition resin layer, thereby electrically connecting the plurality of second active material layers in parallel. When viewed from the lamination direction of the metal foil and the metal vapor-deposited resin layer, each of the multiple electrode stacks has a sealed portion and an unsealed portion other than the sealed portion, and the metal foil, the metal vapor-deposited resin layer, and the resin sealing member surrounding the peripheral edge of the electrode stack have sealed portions and unsealed portions, and The metal foil is folded or wound so that its outer surface faces outwards. Electrode stack module.

2. The electrode laminate module according to claim 1, wherein the metal foil and the metal vapor-deposited resin layer are folded in the unsealed portion so that the metal foil faces outward.

3. When viewed from the stacking direction of the electrode stack, the dimensions of the separator layer or the solid electrolyte layer, and the dimensions of one of the first and second active material layers, are greater than the dimensions of the other of the first and second active material layers, and The resin sealing member is in contact with the peripheral edge of the separator layer or the solid electrolyte layer, and / or with one of the first and second active material layers, and is not in contact with the other peripheral edge of the first and second active material layers. The electrode stack module according to claim 1.

4. The electrode laminate module according to claim 3, wherein, when viewed from the lamination direction of the metal foil and the metal vapor-deposited resin layer, the vapor-deposited metal film and the metal foil do not overlap in the unsealed portion.

5. The electrode laminate module according to claim 1, wherein the thickness of the deposited metal film is 1.0 μm or less.

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