Packaging materials for all-solid-state batteries

Abstract

To provide an outer packaging material for a charging device that can improve gas barrier properties.SOLUTION: An outer packaging material 2 for a charging device according to the present invention that constitutes a casing 1 in which a charging device is housed includes a metal foil layer 20, a base material layer 21 laminated on the outer surface side of the metal foil layer 20, a sealant layer 22 laminated on the inner surface side of the metal foil layer 20, and a gas barrier layer 4 that is laminated on the inner surface side of the sealant layer 22 to prevent the intrusion of an outside air component.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an outer packaging material for a power storage device used as an outer packaging material for power storage devices such as batteries and capacitors used in mobile electronic devices such as smartphones, and related technologies thereof, such as batteries and capacitors used for power storage in automobiles and generators.

Background Art

[0002] Power storage devices such as batteries and capacitors (capacitors) are used, for example, as power storage devices for mobile electronic devices such as smartphones, tablets, video cameras, notebook computers, etc., hybrid vehicles, electric vehicle power supply batteries, as well as wind power generators, solar power generators, and night-time electricity storage machines.

[0003] As the casing (outer packaging material) of a lithium-ion secondary battery or an electric double layer capacitor (ultra capacitor, super capacitor) used as a power storage device, generally, a metal can or the like has been used. However, in recent years, in order to achieve miniaturization and an improvement in the degree of freedom of shape, a technique using a laminate material (laminated body) as an outer packaging material for a power storage device has been proposed.

[0004] Conventionally, in a lithium-ion secondary battery or the like using a frequently used liquid electrolyte, there is a risk that the separator may be destroyed due to liquid leakage or the generation of dendrites due to corrosion deterioration of the outer packaging material, resulting in ignition due to a short circuit. Therefore, research and development of the outer packaging material have been promoted from the viewpoints of corrosion resistance and liquid leakage. For example, in the case of a battery with a liquid electrolyte, in order to improve the corrosiveness of the casing to the electrolyte, a material with high corrosion resistance is used on the inner surface side of the outer packaging material constituting the casing.

[0005] On the other hand, a secondary battery with a solid electrolyte (all-solid-state battery) has attracted much attention from the aspect of safety, etc., because there is no liquid leakage or generation of dendrites, and there are few ignition factors. Furthermore, since the electrolyte of an all-solid-state battery is solid, the material used on the inner surface side of the outer packaging material does not require such high corrosion resistance.

[0006] However, in all-solid-state batteries, since there is no liquid such as electrolyte inside the casing, the electrode active material and the solid electrolyte itself are not protected by liquid. In other words, the solid electrolyte and electrode active material are susceptible to adverse effects from external components such as oxygen and moisture in the atmosphere, so it is preferable to reliably prevent the intrusion of oxygen and moisture. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 5463902 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Under these circumstances, for example, Patent Document 1 proposes a technology to improve the gas barrier properties of battery casings in order to prevent the intrusion of oxygen, moisture, etc. However, in the field of casings for energy storage devices, and especially in the field of casings for all-solid-state batteries, there is a current demand for improved gas barrier properties as much as possible, and there is an even greater desire for further improvements in gas barrier properties.

[0009] This invention has been made in view of the above-mentioned problems, and aims to provide an outer packaging material for energy storage devices that can improve gas barrier properties and related technologies. [Means for solving the problem]

[0010] To solve the above problems, the present invention comprises the following means.

[0011] [1] An outer packaging material for an energy storage device that constitutes a casing in which an energy storage device is housed, A metal foil layer, A base material layer laminated on the outer surface side of the metal foil layer, A sealant layer laminated on the inner surface side of the metal foil layer, An outer packaging material for an energy storage device, characterized by comprising a gas barrier layer laminated on the inner surface side of the sealant layer to prevent the intrusion of outside air components.

[0012] [2] The outer packaging material for an energy storage device according to paragraph 1 above, wherein the gas barrier layer is composed of an insulator.

[0013] [3] The outer packaging material for an energy storage device according to paragraph 1 or 2, wherein the gas barrier layer comprises one or more inorganic oxides selected from aluminum, silicon, magnesium, and alloys thereof.

[0014] [4] An outer packaging material for an energy storage device according to any one of the preceding paragraphs 1 to 3, wherein the thickness of the gas barrier layer is set to 0.001 μm to 2 μm.

[0015] [5] The outer packaging material for an energy storage device according to any one of the preceding paragraphs 1 to 4, wherein the gas barrier layer is composed of a vapor-deposited film.

[0016] [6] The outer packaging material for an energy storage device according to any one of the preceding paragraphs 1 to 5, wherein fine irregularities are formed on the inner surface side of the peripheral edge of the sealant layer.

[0017] [7] A casing for an energy storage device, which houses an energy storage device inside, A casing for an energy storage device, characterized in that it is composed of the outer packaging material described in any one of the preceding paragraphs 1 to 6.

[0018] [8] The sealant layers at the peripheral edge of the outer packaging material are joined and integrated via the gas barrier layer, The casing for an energy storage device according to claim 7, wherein the joint portion at the peripheral edge of the outer packaging material contains filler particles of inorganic oxide contained in the gas barrier layer.

[0019] [9] A casing made of the outer packaging material described in any one of paragraphs 1 to 6 above, A battery device comprising a battery housed in the casing.

[0020]

[10] The battery device according to item 9 above, wherein the battery is composed of an all-solid-state battery. [Advantages of the Invention]

[0021] According to the outer packaging material for a power storage device of Invention [1], since the gas barrier layer is formed on the inner surface of the sealant layer, when the sealant layer is joined to the sealant layer of another outer packaging material or the like by heat adhesion or the like, the gas barrier layer will exist at the joint. Therefore, it is possible to prevent the intrusion of outside air components from the joint of the sealant layer, and the gas barrier property can be improved.

[0022] According to the outer packaging material for a power storage device of Invention [2], since the gas barrier layer in contact with the power storage device is composed of an insulator, it is possible to reliably prevent a short circuit of the power storage device.

[0023] According to the outer packaging material for a power storage device of Invention [3], since the gas barrier layer contains an inorganic oxide, it is possible to prevent the intrusion of oxygen and moisture, which are particularly susceptible to adverse effects.

[0024] According to the outer packaging material for a power storage device of Invention [4], since the thickness of the gas barrier layer is specified, when the sealant layer is joined to the sealant layer of another outer packaging material or the like by heat adhesion or the like, the adverse effects due to the presence of the gas barrier layer can be avoided, and the heat adhesion treatment can be performed without problems.

[0025] According to the outer packaging material for a power storage device of Invention [5], since the gas barrier layer is formed by a vapor deposition film, a gas barrier layer with a desired thickness can be reliably formed.

[0026] According to the outer packaging material for a power storage device of Invention [6], since the fine concavo-convex portions are formed on the inner surface side of the sealant layer, the adhesive strength can be increased when the sealant layer is joined to the sealant layer of another outer packaging material or the like by heat adhesion or the like.

[0027] According to the invention of [7], a casing for an energy storage device that has the same effects as described above can be provided.

[0028] The casing for energy storage devices of the invention [8] can more reliably prevent outside air components from entering through the joints between the outer packaging materials.

[0029] According to the invention of [9]

[10] , a battery device that achieves the same effects as described above can be provided. [Brief explanation of the drawing]

[0030] [Figure 1] Figure 1 is a schematic cross-sectional view showing an outer packaging material for an energy storage device, which is an embodiment of this invention. [Figure 2] Figure 2 is a schematic cross-sectional view showing a casing for an all-solid-state battery fabricated using the outer packaging material of the embodiment. [Modes for carrying out the invention]

[0031] Figure 1 is a schematic cross-sectional view showing an outer casing material 1 for an energy storage device, which is an embodiment of this invention. As shown in the figure, the outer casing material 2 used in this embodiment is made up of a laminate such as a laminate sheet, and constitutes the casing of a battery device (battery pack) that uses an all-solid-state battery, as will be described later.

[0032] This outer packaging material 2 comprises a metal foil layer 20, a base material layer 21 laminated to the outer surface of the metal foil layer 20 via an outer adhesive layer 31, a sealant layer 22 laminated to the inner surface of the metal foil layer 20 via an inner adhesive layer 32, and a gas barrier layer 4 laminated and integrated to the inner surface of the sealant layer 22. In other words, the outer packaging material 2 of this embodiment is composed of a laminate consisting of a base material layer, an outer adhesive layer, a metal foil layer, an inner adhesive layer, a sealant layer, and a gas barrier layer.

[0033] In this specification and in the claims, the term "foil" is used to include films, and the term "film" is used to include sheets and thin plates.

[0034] In this embodiment, the base layer 21 is made of a heat-resistant resin or the like with a thickness of 5 μm to 50 μm. As this base layer 21, stretched polyamide film, stretched polyester film, and stretched polyolefin film can be used, and when heat resistance is a particular consideration, stretched aromatic polyamide film, polyimide film, and polyetherketone (PEEK) film can be suitably used.

[0035] The metal foil layer 20 has a thickness of 5 μm to 120 μm and has the function of blocking the intrusion of oxygen and moisture from the surface (outer surface). Suitable materials for this metal foil layer 20 include aluminum foil, SUS foil (stainless steel foil), copper foil, nickel foil, etc. In this embodiment, the terms "aluminum," "copper," and "nickel" are used to include their alloys as well.

[0036] Furthermore, applying a plating treatment to the metal foil layer 20 reduces the risk of pinhole formation and further improves the function of blocking the intrusion of oxygen and moisture.

[0037] Furthermore, if the metal foil layer 20 is subjected to a chemical conversion treatment such as chromate treatment, its corrosion resistance is further improved, making it possible to more reliably prevent defects such as chipping, and also to further improve durability by improving adhesion with the resin.

[0038] Chemical conversion treatment is performed, for example, by applying one of the aqueous solutions 1) to 3) below to the surface of a degreased metal foil, and then drying it.

[0039] 1) An aqueous solution of a mixture containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of metal salts and nonmetal salts of fluorides. 2) An aqueous solution of a mixture containing phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium(III) salts. 3) An aqueous solution of a mixture containing phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, at least one compound selected from the group consisting of chromic acid and chromium(III) salts, and at least one compound selected from the group consisting of metal salts of fluorides and nonmetal salts of fluorides. The film formed on the surface of the metal foil by the above chemical conversion treatment, i.e., the underlayer, has a chromium content (per side) of 0.1 mg / m². 2 ~50mg / m 2 It is preferable to do so, and in particular, 2 mg / m² 2 ~20mg / m 2 It is preferable to do so.

[0040] For the outer adhesive layer 31 used to bond the base material layer 21 to the metal foil layer 20, two-component curing urethane adhesives, olefin adhesives, acrylic adhesives, epoxy adhesives, etc., can be suitably used. Furthermore, considering heat resistance, inorganic adhesives or epoxy adhesives are preferable. However, epoxy adhesives may have a high curing temperature range.

[0041] The sealant layer 22 has a thickness of 15 μm to 120 μm and is composed of a film made of a heat-adhesive (heat-fusible) resin. The resin that makes up this sealant layer 22 can be a group consisting of polyolefins such as polypropylene and polyethylene, olefin polymers, acid-modified products thereof, and ionomers. In particular, when heat resistance is considered, polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) can be suitably used.

[0042] As the adhesive for the inner adhesive layer 32 used to attach the sealant layer 22 to the metal foil layer 20, the same type of adhesive as that used for the outer adhesive layer 31 can be used. In other words, in this embodiment, as will be described later, since the all-solid-state battery is housed in the casing, there is no liquid electrolyte, and therefore electrolyte resistance is not required for the inner adhesive layer 32, so the same type of adhesive as that used for the outer adhesive layer 31 can be used.

[0043] As the gas barrier layer 4, a layer containing one or more inorganic oxides selected from aluminum, silicon, magnesium, and their alloys can be suitably used.

[0044] In this embodiment, when a bare cell containing a solid electrolyte is coated with an insulating resin and sealed inside a casing, insulating properties are no longer an absolute requirement for the gas barrier layer 4. Therefore, as previously described, aluminum and other materials can be used without any problems.

[0045] In this embodiment, the gas barrier layer 4 is preferably composed of a vapor-deposited film formed by dry coating the inorganic oxide described above onto the film constituting the sealant layer 22. That is, by dry coating, the gas barrier layer 4 can be formed over the entire area to be formed, reliably preventing the occurrence of areas where the gas barrier layer 4 is missing, and significantly improving the gas barrier properties. Furthermore, since the gas barrier layer 4 can be formed uniformly and thinly over the entire area, adverse effects due to the presence of the gas barrier layer 4 can be avoided when heat sealing the sealant layer 22, as will be described later, and the heat bonding process can be performed without problems.

[0046] For dry coating, well-known methods such as CVD and PVD (sputtering, ion beam, etc.) can be employed.

[0047] The thickness of the gas barrier layer 4 is preferably set to 0.001 μm to 2 μm.

[0048] In this embodiment, in addition to the inorganic oxides mentioned above, metal alkoxides may also be used as the gas barrier layer 4.

[0049] Furthermore, resin-based materials can also be used as the gas barrier layer 4. For example, vinylidene chloride (PVDC), vinylidene chloride-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer (EVOH), etc., can be used.

[0050] These resin-based films can be bonded onto the sealant layer 22 with an adhesive to form a gas barrier layer 4.

[0051] The gas barrier layer 4 can also be laminated on the sealant layer 22 using a wet coating method, such as gravure coating, reverse coating, or die coating.

[0052] In this embodiment, the outer packaging material 2 has the above configuration, and as shown in Figure 2, the battery device is manufactured by covering the all-solid-state battery 10 with this outer packaging material 2. That is, two rectangular outer packaging materials 2,2 are stacked vertically via the all-solid-state battery (cell) 10, and the sealant layers 22,22 at the outer edges of both outer packaging materials 2,2 are bonded together in an airtight state (sealed state) by heat bonding (heat sealing) via the gas barrier layers 4,4, thereby manufacturing a battery device in which the all-solid-state battery 10 is housed in a bag-shaped casing 1 made of outer packaging materials 2,2.

[0053] In this embodiment, before heat bonding the outer packaging materials 2,2 together, knurling is applied to the bonding surface (inner surface) at the outer peripheral edge of the outer packaging material 2, creating fine irregularities on the bonding surface. This improves the heat bonding properties between the outer peripheral edges of the outer packaging materials 2,2, significantly increasing the bonding strength between the outer packaging materials 2,2 and providing a good seal.

[0054] Furthermore, in this embodiment, as previously described, the all-solid-state battery 10 inside the casing 1 is susceptible to adverse effects from external air components such as oxygen and moisture. Therefore, the heat sealing treatment of the outer packaging materials 2,2 is performed in an environment purged with helium or dry nitrogen. As a result, the amount of residual oxygen and moisture inside the casing 1 can be reduced as much as possible, adverse effects on the all-solid-state battery 10 due to oxygen and moisture can be sufficiently avoided, power supply can be performed in a stable state, and good battery performance can be obtained.

[0055] In particular, in this embodiment, the heat bonding treatment of the outer packaging materials 2,2 is performed under reduced pressure. As a result, the amount of oxygen and moisture remaining inside the casing 1 can be further reduced, and good battery performance can be reliably obtained.

[0056] In the battery device of this embodiment, the seal portion (heat-bonded portion) 5, which serves as the joint between the outer packaging materials 2,2 in the casing 1, contains a mixture of resin constituting the sealant layer 22 and inorganic oxide constituting the gas barrier layer 4. The inorganic oxide is finely and densely dispersed within the seal portion 5 as a filler (gap filler). As a result, outside air components such as oxygen and moisture attempting to enter the casing 1 from the seal portion 5 between the outer packaging materials 2,2 must pass through the gaps in the inorganic oxide in the seal portion 5, making the entry path very long and complex. Consequently, it is possible to reliably prevent outside air components such as oxygen and moisture from entering the casing 1 from the seal portion 5 between the outer packaging materials 2,2.

[0057] In this embodiment of the battery device, outside air components attempting to enter the casing 1 from the outer surface of the outer packaging materials 2,2 by passing through the inside of the outer packaging materials 2 are blocked by the double layer of metal foil layer 20 and gas barrier layer 4. Therefore, it is possible to reliably prevent outside air components from entering from the outer surface of the outer packaging materials 2,2.

[0058] Thus, with the battery device of this embodiment, it is possible to reliably prevent external air components such as oxygen and moisture from entering the casing 1, thereby maintaining a stable power supply for a long period of time and providing a highly reliable, high-quality battery device.

[0059] In the above embodiment, the case in which an all-solid-state battery is housed in the casing was used as an example, but the present invention is not limited to this, and other batteries besides solid-state batteries, such as lithium-ion secondary batteries containing a liquid electrolyte, may also be housed in the casing.

[0060] Furthermore, although the above embodiment described an example of a battery device (battery pack) in which a battery is housed as an energy storage device within a casing, the present invention is not limited to this and can also be applied to an energy storage device that houses an energy storage device such as a capacitor within a casing.

[0061] Furthermore, although the above embodiment described an example of manufacturing a casing using two outer packaging materials, the invention is not limited to this. In the present invention, a casing may also be manufactured by folding one outer packaging material in half and then heat-bonding the outer edges of the overlapping outer packaging material, excluding the folded portion, to form a single casing. Needless to say, in the present invention, a single casing may also be manufactured using three or more outer packaging materials.

[0062] Furthermore, although the above embodiments have described the case in which a casing is manufactured using a film or sheet-like outer packaging material, the invention is not limited to this, and in the present invention, the outer packaging material may be thermoformed into a predetermined three-dimensional shape, and the casing may be manufactured using the outer packaging material in that three-dimensional shape. [Examples]

[0063] <Example 1> In preparing the outer packaging material 1, a metal foil layer 20 was prepared by coating both sides of an aluminum foil made of A8021-O as specified in JIS H4160, with a thickness of 35 μm, with a chemical conversion treatment solution consisting of polyacrylic acid, a trivalent chromium compound, water, and alcohol, and drying it at 180°C to perform the chemical conversion treatment so that the amount of chromium deposited was 10 mg / m2 per side.

[0064] A biaxially stretched 6-nylon film with a thickness of 20 μm, which serves as the base layer 22, is bonded to one side (outer surface) of the metal foil layer member, which serves as the metal foil layer 20, via a two-component curing polyester-polyurethane adhesive applied to a thickness of 2 μm as the outer adhesive layer 31.

[0065] Next, a 30 μm thick unoriented polypropylene (CPP) film, which serves as the sealant layer 22, was laminated onto the other side (inner surface) to form a gas barrier layer 4 by depositing a silica (silicon oxide) vapor-deposited film (0.1 μm thick) by electron beam heating of silicon monooxide.

[0066] Next, a laminate for packaging material was fabricated by bonding one side (outer surface) of a sealant layer 22 with a gas barrier layer 4 to the other side (inner surface) of the metal foil layer 20 with the base material layer 22 via a two-component curing polyester-polyurethane adhesive applied to a thickness of 2 μm as an inner adhesive layer 32.

[0067] Next, the laminate for the outer packaging material described above was subjected to heat aging treatment at 40°C for 10 days to produce outer packaging material 1 of Example 1.

[0068] <Example 2> The outer packaging material 1 of Example 2 was prepared in the same manner as in Example 1, except that a coating layer coated with vinylidene chloride resin with a thickness of 2 μm was laminated as the gas barrier layer 4 laminated on the inner surface of the sealant layer 22, instead of a silica vapor-deposited film.

[0069] <Comparative Example> A comparative example packaging material was prepared in the same manner as in Example 1, except that it did not have a gas barrier layer.

[0070] <Evaluation of seal strength> Two outer packaging material samples measuring 15 mm in width and 150 mm in length (a pair) were cut from the outer packaging material of Example 1. These pair of outer packaging material samples were placed on top of each other so that their inner surfaces (sealant layers) were in contact with each other through the gas barrier layer. Using a heat sealing device (TP-701-A) manufactured by Tester Industries Co., Ltd., a heat sealing was performed by heating one side under the conditions of a heat sealing temperature of 200°C, a sealing pressure of 0.2 MPa (gauge indicated pressure), and a sealing time of 2 seconds, to produce the casing sample of Example 1.

[0071] Next, using a Shimadzu Access Strograph (AGS-5kNX) in accordance with JIS Z0238-1998, the peel strength of the sealant layer portion, which is the sealing portion of a pair of outer packaging material samples, was measured when peeled at a 90-degree angle with a tensile strength of 100 mm / min. This was defined as the seal strength (N / 15 mm width). The results are shown in Table 1.

[0072] In Example 2 and the Comparative Example, casing samples were prepared in the same manner as in Example 1, and the seal strength (N / 15mm width) was measured in the same manner. The results are shown in Table 1.

[0073] [Table 1]

[0074] As can be seen from Table 1, the casing samples of Examples 1 and 2 and the comparative example all ensured sufficient seal strength and exhibited good sealing performance.

[0075] <Evaluation of gas barrier properties> Using the outer packaging material from Example 1, two three-sided bags were prepared by overlapping a pair of outer packaging material samples similar to those described above, sealing three of the four sides by heat sealing, and leaving one side open.

[0076] Next, in an environment inside a glove box purged with dry nitrogen, an oxygen indicator was placed in one of the three-sided bags, and the open side (one opening) was sealed by heat sealing under reduced pressure to prepare a sample for oxygen evaluation. Simultaneously, cobalt chloride paper (moisture indicator) was placed in the other three-sided bag, and one opening was sealed in the same manner to prepare a sample for moisture evaluation.

[0077] The oxygen indicator is a type that changes color to pink more when the oxygen concentration is low and to blue more when the oxygen concentration is high. The cobalt chloride paper (moisture indicator) changes color from blue to pink when it comes into contact with water or moisture.

[0078] 1. Evaluation of oxygen intrusion Two rectangular aluminum laminate sheets were stacked together, and three of the four sides were sealed to form a three-sided bag-like test container. The oxygen evaluation sample was placed inside the container, and after replacing the inside of the test container with oxygen gas, one end of the container was sealed to create a tight seal. The container was left to stand at room temperature for 30 days. After that, the oxygen evaluation sample was removed, and the degree of discoloration of the oxygen indicator was visually observed to determine whether or not oxygen had entered the sample. The results are shown in Table 2.

[0079] 2. Evaluation against moisture intrusion The above-mentioned moisture evaluation samples were left standing for 60 days at 40°C and 90RH (relative humidity). Afterward, the degree of discoloration of the moisture evaluation agent was visually observed to determine whether or not moisture (humidity) had penetrated the sample. The results are shown in Table 2.

[0080] [Table 2]

[0081] For the outer packaging material of Example 2 and the outer packaging material of the Comparative Example, oxygen evaluation samples and moisture evaluation samples were prepared in the same manner as described above, and the intrusion of oxygen and moisture was evaluated in the same way. The results are shown in Table 2.

[0082] As can be seen from Table 2, the samples of Examples 1 and 2 related to the present invention showed no intrusion of oxygen or moisture, and possessed sufficient gas barrier properties against oxygen and moisture. In particular, they are considered suitable for use as casings (outer packaging materials) for all-solid-state batteries, which are susceptible to adverse effects from oxygen and moisture.

[0083] Furthermore, although no moisture intrusion was observed in the comparative example sample, slight oxygen intrusion was observed, suggesting that its oxygen barrier properties are inferior to those of Examples 1 and 2. [Industrial applicability]

[0084] The outer packaging material for energy storage devices of this invention can be suitably used as a casing material for a battery device that houses a battery such as an all-solid-state battery. [Explanation of Symbols]

[0085] 1: Casing 10: Batteries (energy storage devices) 2:Outer packaging material 20: Metal foil layer 21: Base material layer 22: Sealant layer 4: Gas barrier layer 5: Seal area (joint)

Claims

1. An outer casing material for a solid-state battery, which constitutes a casing in which a solid-state battery is housed, A metal foil layer, A base material layer laminated on the outer surface side of the metal foil layer, A sealant layer laminated on the inner surface side of the metal foil layer, The sealant layer is laminated with a gas barrier layer for preventing the intrusion of outside air components, The gas barrier layer is formed by adhering a resin-based film to the inner surface side of the sealant layer. The aforementioned resin-based film is characterized by being composed of one of the following resins: vinylidene chloride, vinylidene chloride-methyl acrylate copolymer, or ethylene-vinyl alcohol copolymer, making it an outer packaging material for all-solid-state batteries.

2. The outer packaging material for an all-solid-state battery according to claim 1, wherein the resin-based film is bonded to the sealant layer with an adhesive.

3. The outer packaging material for an all-solid-state battery according to claim 1 or 2, wherein the gas barrier layer is composed of an insulator.

4. The outer packaging material for an all-solid-state battery according to any one of claims 1 to 3, wherein the thickness of the gas barrier layer is set to 0.001 μm to 2 μm.

5. A casing for a solid-state battery, which houses a solid-state battery inside, A casing for an all-solid-state battery, characterized by being composed of an outer packaging material according to any one of claims 1 to 4.

6. A casing composed of an outer packaging material according to any one of claims 1 to 4, A battery device characterized by comprising a solid-state battery housed within the aforementioned casing.

Images