Packaging film of aluminum plastic film for sulfide solid-state battery

Abstract

The invention discloses a packaging film of an aluminum-plastic film for a sulfide solid-state battery. The packaging film comprises a bonding layer, a waterproof layer, a core layer, a water content indication layer and a heat sealing layer, the bonding layer is made of maleic anhydride modified polypropylene resin; the waterproof layer is formed by blending maleic anhydride modified polypropylene resin, binary polypropylene random copolymer, vinyl or propenyl elastomer and calcium hydroxide; the core layer is formed by blending block polypropylene, a vinyl or propenyl elastomer and calcium hydroxide; the water content indicating layer is formed by blending binary polypropylene random copolymer, a vinyl or propenyl elastomer and an anhydrous cupric sulfate modifier; the heat sealing layer is formed by blending binary polypropylene random copolymer or ternary polypropylene random copolymer, a vinyl or propenyl elastomer and a slipping agent; water vapor is blocked through the waterproof layer, calcium hydroxide is adopted to absorb a trace amount of entering water vapor, the waterproof performance of the film is improved, and the problem that an existing aluminum plastic film is poor in waterproof performance is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packaging materials, and particularly to a packaging film for an aluminum-plastic film used in a sulfide solid-state battery. Background Art

[0002] At present, solid-state batteries are developing rapidly. Solid-state batteries are further divided into polymer solid-state batteries, oxide solid-state batteries, sulfide solid-state batteries, etc. according to different electrolytes. Sulfide has the highest ionic conductivity. Therefore, sulfide all-solid-state batteries are the most promising for commercialization. However, lithium sulfide in sulfide solid-state batteries will react with water to generate hydrogen sulfide gas, resulting in the failure and bulging of solid-state batteries. During use, the packaging material of sulfide solid-state batteries is required to have good water vapor barrier properties and recognition. Generally, an aluminum-plastic film is used as the packaging material at present. The structure of the aluminum-plastic film is generally a heat-sealing layer in contact with the battery core, an aluminum foil layer, and an external protective layer from the inside to the outside.

[0003] In Chinese Patent CN118144389A, it focuses on co-extrusion casting with a blend of polypropylene resin and functional elastomer. By selecting and controlling the proportion of polypropylene and functional elastomer in each layer of material, the film formed by co-extrusion casting finally meets the requirements of high draw depth in the packaging of solid-state batteries.

[0004] In Chinese Patent CN209224629U, a solid-state battery packaging material is composed of a fluoroplastic film layer, a polyvinylidene chloride film layer, a metallized ethylene-vinyl alcohol copolymer stretched film layer, an aluminum foil layer, a nylon film layer, and a polyolefin film layer to meet the requirements of solid-state lithium batteries in terms of weather resistance, aging resistance, chemical resistance, bendability, and puncture resistance.

[0005] None of the above patents have made targeted solutions for the water-sensitive characteristics of sulfide solid-state batteries. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the present invention provides a packaging film for an aluminum-plastic film used in a sulfide solid-state battery, which can improve the water vapor barrier property of the aluminum-plastic film, thereby improving the waterproof performance of the film.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An encapsulation film for a sulfide solid-state battery aluminum-plastic film, characterized in that it comprises an adhesive layer, a waterproof layer, a core layer, a moisture content indicating layer, and a heat-sealing layer; the adhesive layer is maleic anhydride-modified polypropylene resin; the waterproof layer is composed of maleic anhydride-modified polypropylene resin, binary random copolymer polypropylene, an elastomer of vinyl or propylene, and calcium hydroxide blended together; the core layer is composed of block polypropylene, an elastomer of vinyl or propylene, and calcium hydroxide blended together; the moisture content indicating layer is composed of binary random copolymer polypropylene, an elastomer of vinyl or propylene, and an anhydrous copper sulfate modified body blended together; the heat-sealing layer is composed of binary random copolymer polypropylene or terpolymer polypropylene, an elastomer of vinyl or propylene, and a slip agent blended together; the waterproof layer blocks water vapor, and calcium hydroxide is used to absorb the slightly entering water vapor to improve the waterproof performance of the film, solving the problem of poor waterproof performance of the existing aluminum-plastic film.

[0009] As a preferred solution, the thickness of the adhesive layer is 3 - 25 μm; the thickness of the waterproof layer is 3 - 12.5 μm; the thickness of the core layer is 18 - 75 μm; the thickness of the moisture content indicating layer is 3 - 12.5 μm; the thickness of the heat-sealing layer is 3 - 25 μm.

[0010] As a preferred solution, the melting points of the maleic anhydride-modified polypropylene resins in the adhesive layer and the waterproof layer are both 140°C to 160°C, the melt indices are both 3 - 8 g / 10 min, and the Vicat softening points are both 110°C to 150°C.

[0011] As a preferred solution, the weight percentage of maleic anhydride-modified polypropylene resin in the waterproof layer is 32.5% - 52.5%, the weight percentage of copolymer polypropylene is 30% - 39%, the weight percentage of the elastomer of vinyl or propylene is 10% - 30%, and the weight percentage of calcium hydroxide is 1% - 5%, and the sum of the proportions of each component is 100%.

[0012] As a preferred solution, the weight percentage of block polypropylene in the core layer is 70% - 90%, the weight percentage of the elastomer of vinyl or propylene is 9.5% - 29%, and the weight percentage of calcium hydroxide is 0.5% - 1%, and the sum of the proportions of each component is 100%.

[0013] As a preferred solution, the fineness of calcium hydroxide in both the waterproof layer and the core layer is ≥1200 mesh, and the purity is ≥95%.

[0014] As a preferred solution, the weight percentage of binary random copolymer polypropylene in the moisture content indicating layer is 60% - 90%, the weight percentage of the elastomer of vinyl or propylene is 9% - 30%, and the weight percentage of the anhydrous copper sulfate modified body is 1% - 10%, and the sum of the proportions of each component is 100%.

[0015] As a preferred solution, the preparation method of the modified anhydrous copper sulfate is as follows: Dissolve amorphous powder of anhydrous copper sulfate in an aqueous solution of polyacrylamide with a mass concentration of 0.1%-0.3%, where the mass concentration of anhydrous copper sulfate in the aqueous polyacrylamide solution is 0.5%-2%, and then dry it at 130°C - 150°C to obtain the raw material of the modified anhydrous copper sulfate; the raw material of the modified anhydrous copper sulfate is ground and sieved to obtain the modified anhydrous copper sulfate.

[0016] As a preferred solution, the fineness of the modified anhydrous copper sulfate is ≥600 mesh.

[0017] As a preferred solution, the weight percentage of the copolymerized polypropylene in the heat-sealing layer is 69%-90%, the weight percentage of the elastomer of vinyl or propenyl is 9.5%-30%, and the weight percentage of the slip agent is 0.5%-1%, and the sum of the proportions of each component is 100%.

[0018] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically,

[0019] 1. By using the encapsulation film of the present invention to replace the internal heat-sealing layer in contact with the battery of the aluminum-plastic film, the waterproof layer is used to block water vapor, and calcium hydroxide is used to absorb the slightly entered water vapor to improve the waterproof performance of the film;

[0020] 2. By setting anhydrous copper sulfate in the water content indicating layer, using the principle that anhydrous copper sulfate changes color when absorbing water, when the aluminum-plastic film is damaged, by observing the color change of the water content indicating layer, it can be judged whether water vapor enters the water content indicating layer, which is convenient to timely detect whether the battery is flooded and timely replace the battery to improve the use safety.

[0021] To more clearly illustrate the structural features, technical means, and the specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a diagram showing the usage state of an embodiment of the present invention in cooperation with an aluminum-plastic film for packaging an electric core.

[0023] Description of the Reference Numerals in the Drawings:

[0024] 10 - Adhesive layer; 20 - Waterproof layer; 30 - Core layer;

[0025] 40 - Water content indicating layer; 50 - Heat-sealing layer; 60 - Electric core;

[0026] 70 - Aluminum-plastic film. Detailed implementation mode

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Such as Figure 1As shown in the figure, a packaging film for an aluminum-plastic film used in a sulfide solid-state battery includes an adhesive layer 10, a waterproof layer 20, a core layer 30, a water content indicator layer 40, and a heat-sealing layer 50; the adhesive layer 10 is a maleic anhydride-modified polypropylene resin; the waterproof layer 20 is made by blending a maleic anhydride-modified polypropylene resin, a binary random copolymerized polypropylene, an elastomer of vinyl or propylene, and calcium hydroxide; the core layer 30 is made by blending a block polypropylene, an elastomer of vinyl or propylene, and calcium hydroxide; the water content indicator layer 40 is made by blending a binary random copolymerized polypropylene, an elastomer of vinyl or propylene, and a modified anhydrous copper sulfate; the heat-sealing layer 50 is made by blending a binary random copolymerized polypropylene or a ternary copolymerized polypropylene, an elastomer of vinyl or propylene, and a slip agent; the thickness of the adhesive layer 10 is 3-25 μm; the thickness of the waterproof layer 20 is 3-12.5 μm; the thickness of the core layer 30 is 18-75 μm; the thickness of the water content indicator layer 40 is 3-12.5 μm; the thickness of the heat-sealing layer 50 is 3-25 μm; the total thickness of the packaging film is 30-150 μm; the fineness of calcium hydroxide in both the waterproof layer 20 and the core layer 30 is ≥1200 mesh, and the purity is ≥95%; the melting points of the maleic anhydride-modified polypropylene resins in both the adhesive layer 10 and the waterproof layer 20 are 140°C to 160°C, the melt indices are 3 to 8 g / 10 min, and the Vicat softening points are 110°C to 150°C; the weight percentage of the maleic anhydride-modified polypropylene resin in the waterproof layer 20 is 32.5%-52.5%, the weight percentage of the copolymerized polypropylene is 30%-39%, the weight percentage of the elastomer of vinyl or propylene is 10%-30%, and the weight percentage of calcium hydroxide is 1%-5%, and the sum of the proportions of each component is 100%; the weight percentage of the block polypropylene in the core layer 30 is 70%-90%, the weight percentage of the elastomer of vinyl or propylene is 9.5%-29%, and the weight percentage of calcium hydroxide is 0.5%-1%, and the sum of the proportions of each component is 100%; the weight percentage of the binary random copolymerized polypropylene in the water content indicator layer 40 is 60%-90%, the weight percentage of the elastomer of vinyl or propylene is 9%-30%, and the weight percentage of the modified anhydrous copper sulfate is 1%-10%, and the sum of the proportions of each component is 100%; the weight percentage of the copolymerized polypropylene in the heat-sealing layer 50 is 69%-90%, the weight percentage of the elastomer of vinyl or propylene is 9.5%-30%, and the weight percentage of the slip agent is 0.5%-1%, and the sum of the proportions of each component is 100%; the waterproof layer 20 blocks water vapor, and calcium hydroxide is used to absorb the trace water vapor that enters to improve the waterproof performance of the film, solving the problem of poor waterproof performance of the existing aluminum-plastic film.

[0030] The preparation method of the modified anhydrous copper sulfate is as follows: dissolve amorphous powder of anhydrous copper sulfate in an aqueous solution of polyacrylamide with a mass concentration of 0.1%-0.3%, the mass concentration of anhydrous copper sulfate in the aqueous solution of polyacrylamide is 0.5%-2%, and then dry at 130°C-150°C to obtain the raw material of the modified anhydrous copper sulfate; the raw material of the modified anhydrous copper sulfate is ground and sieved to obtain the modified anhydrous copper sulfate.

[0031] The fineness of the modified anhydrous copper sulfate is ≥600 mesh; by grinding the fineness of the modified anhydrous copper sulfate to ≥600 mesh, the dispersion uniformity of the modified anhydrous copper sulfate can be improved.

[0032] In the present invention, in order to improve the dispersion uniformity of the modified anhydrous copper sulfate and the elastomer of vinyl or propylene group in the water content indicating layer 40, the modified anhydrous copper sulfate and the elastomer of vinyl or propylene group can be granulated twice, and the granulator adopts a high-shear twin-screw granulator.

[0033] In the present invention, in order to improve the dispersion uniformity of calcium hydroxide and the elastomer of vinyl or propylene group in the waterproof layer 20, calcium hydroxide and the elastomer of vinyl or propylene group can be granulated twice, and the granulator adopts a high-shear twin-screw granulator

[0034] In the present invention, the maleic anhydride modified polypropylene resin is one of QF551 or QF840 of Mitsui or 18722 of Arkema;

[0035] The binary random copolymerized polypropylene is one of W331 and WFW4;

[0036] The elastomer of vinyl or propylene group is one of ExxonMobil Vistamaxx polyolefin elastomer and Mitsui TAFMER polyolefin elastomer;

[0037] The calcium hydroxide is produced by Jiangxi Chuangxian Fine Calcium Industry Co., Ltd., with a fineness of 1200 mesh and a purity of ≥95%

[0038] The terpolymerized polypropylene is one of FL7632 and FL7642 of TPC;

[0039] The block polypropylene is one of RF401 or RF402 of South Korea's Hyosung, and CF330 and CF200 of Hanwha;

[0040] The anhydrous copper sulfate is from Xilong Chemical, analytical pure;

[0041] The polyacrylamide is BMfloc 80508 of Shandong Baomo Biochemical Co., Ltd. or HENGFLOC 7006 of Beijing Hengju Chemical Industry Group;

[0042] Slip agent: Jiangsu Jingliang High Polymer Materials Co., Ltd., SE11PP-E (11% high-purity erucamide)

[0043] In the present invention, Comparative Example 1 is commercially available: polypropylene film (50 μm): adhesive layer (3 μm) / aluminum foil layer (40 μm) / polypropylene film layer (40 μm);

[0044] Comparative Example 2 is commercially available: polypropylene film (80 μ): adhesive layer (3 μm) / polyamide film (15 μm) / adhesive layer (3 μm) / aluminum foil layer (40 μm) / adhesive layer (3 μm) / polypropylene film layer (85 μm).

[0045] Example 1

[0046] An encapsulation film for a sulfide solid-state battery, with a total thickness of 80 μ, and the layer thickness ratio of the adhesive layer 10, waterproof layer 20, core layer 30, water content indicator layer 40, and heat-sealing layer 50 is set to 1:0.5:3:0.5:1.

[0047] In the waterproof layer 20, the weight percentage of maleic anhydride-modified polypropylene resin is 32.5%, the weight percentage of binary random copolymer polypropylene is 35%, the weight percentage of vinyl elastomer is 30%, and the weight percentage of calcium hydroxide is 5%.

[0048] In the core layer 30, the weight percentage of block polypropylene is 70%, the weight percentage of vinyl elastomer is 29%, and the weight percentage of calcium hydroxide is 1%.

[0049] In the water content indicator layer 40, the weight percentage of binary random copolymer polypropylene is 60%, the weight percentage of vinyl elastomer is 30%, and the weight percentage of anhydrous copper sulfate modified body is 10%.

[0050] The fineness of the anhydrous copper sulfate modified body is ≥600 mesh.

[0051] In the heat-sealing layer 50, the weight percentage of binary random copolymer polypropylene is 69%, the weight percentage of vinyl elastomer is 30%, and the weight percentage of slip agent is 1%.

[0052] The adhesive layer 10 is maleic anhydride-modified polypropylene resin.

[0053] The melting points of the maleic anhydride-modified polypropylene resins of the adhesive layer 10 and the waterproof layer 20 are both 140°C to 160°C, the melt indices are both 3 to 8 g / 10 min, and the Vicat softening points are both 110°C to 150°C.

[0054] The fineness of the calcium hydroxide in the waterproof layer 20 and the core layer 30 is both ≥1200 mesh, and the purity is both ≥95%.

[0055] Example 2

[0056] An encapsulation film of an aluminum-plastic film for a sulfide solid-state battery, with a total thickness of 80 μm. The layer thickness ratio of the adhesive layer 10, the waterproof layer 20, the core layer 30, the water content indicating layer 40, and the heat-sealing layer 50 is set to 1:0.8:4:0.8:1.

[0057] In the waterproof layer 20, the weight percentage of maleic anhydride-modified polypropylene resin is 40%, the weight percentage of binary random copolymerized polypropylene is 30%, the weight percentage of vinyl elastomer is 27%, and the weight percentage of calcium hydroxide is 3%.

[0058] In the core layer 30, the weight percentage of block polypropylene is 80%, the weight percentage of vinyl elastomer is 19%, and the weight percentage of calcium hydroxide is 1%.

[0059] In the water content indicating layer 40, the weight percentage of binary random copolymerized polypropylene is 80%, the weight percentage of vinyl elastomer is 15%, and the weight percentage of anhydrous copper sulfate-modified body is 5%.

[0060] The fineness of the anhydrous copper sulfate-modified body is ≥600 mesh.

[0061] In the heat-sealing layer 50, the weight percentage of binary random copolymerized polypropylene is 85%, the weight percentage of vinyl elastomer is 14.5%, and the weight percentage of slip agent is 0.5%.

[0062] The adhesive layer 10 is maleic anhydride-modified polypropylene resin.

[0063] The melting points of the maleic anhydride-modified polypropylene resins of the adhesive layer 10 and the waterproof layer 20 are both 140°C to 160°C, the melt indexes are both 3 to 8 g / 10 min, and the Vicat softening points are both 110°C to 150°C.

[0064] The fineness of the calcium hydroxide in the waterproof layer 20 and the core layer 30 is both ≥1200 mesh, and the purity is both ≥95%.

[0065] Example 3

[0066] An encapsulation film of an aluminum-plastic film for a sulfide solid-state battery, with a total thickness of 80 μm. The layer thickness ratio of the adhesive layer 10, the waterproof layer 20, the core layer 30, the water content indicating layer 40, and the heat-sealing layer 50 is set to 1:1:6:1:1.

[0067] In the waterproof layer 20, the weight percentage of maleic anhydride-modified polypropylene resin is 52.5%, the weight percentage of binary random copolymerized polypropylene is 39%, the weight percentage of vinyl elastomer is 10%, and the weight percentage of calcium hydroxide is 1%.

[0068] The weight percentage of block polypropylene in the core layer 30 is 90%, the weight percentage of vinyl elastomer is 9.5%, and the weight percentage of calcium hydroxide is 0.5%.

[0069] In the water content indicating layer 40, the weight percentage of binary random copolymerized polypropylene is 90%, the weight percentage of vinyl elastomer is 9%, and the weight percentage of anhydrous copper sulfate modified body is 1%.

[0070] The fineness of the anhydrous copper sulfate modified body is ≥600 mesh.

[0071] In the heat-sealing layer 50, the weight percentage of binary random copolymerized polypropylene is 90%, the weight percentage of vinyl elastomer is 9.5%, and the weight percentage of slip agent is 0.5%.

[0072] The adhesive layer 10 is maleic anhydride modified polypropylene resin.

[0073] The melting points of the maleic anhydride modified polypropylene resins of the adhesive layer 10 and the waterproof layer 20 are both 140°C to 160°C, the melt indices are both 3 to 8 g / 10 min, and the Vicat softening points are both 110°C to 150°C.

[0074] The fineness of calcium hydroxide in the waterproof layer 20 and the core layer 30 is both ≥1200 mesh, and the purity is both ≥95%.

[0075] In the present invention, the water absorption rates of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2 are compared, and the parameters are as shown in Table 1.

[0076] Test method: Under the same experimental environment, the weight W1 before treatment; the weight W2 after treatment at 85°C RH85% for 24 h, and the weight gain percentage = (W2 - W1) / W1.

[0077] Table 1: Water absorption rates of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2

[0078]

[0079] As can be seen from Table 1, by adding calcium hydroxide to the waterproof layer, the waterproof layer can absorb water. In the water content indicating layer, as is well known to those skilled in the art, the more water the anhydrous copper sulfate absorbs, the deeper the blue color it shows. In actual use, a special color indicator card can be formulated for auxiliary judgment.

[0080] In the present invention, the mechanical properties of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2 are compared, and the parameters are as shown in Table 2.

[0081] Test method: Under the same experimental environment, use a tensile testing machine for testing. The width of the sample is 15 ± 0.5 mm, the length of the sample is 100 mm, the clamping length is 50 mm, the test speed is 100 mm / min, and record the tensile strength and elongation at break.

[0082] Table 2: Mechanical properties of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2

[0083]

[0084] It can be seen from Table 2 that the present invention has a higher MD-direction tensile strength compared to existing products.

[0085] As Figure 2 shown, in actual use, the present invention is used together with the aluminum-plastic film 70, replacing the heat-sealing layer in the aluminum-plastic film 70 for use, and packaging the battery cell 60.

[0086] By using the encapsulation film of the present invention to replace the internal heat-sealing layer 50 in contact with the battery of the aluminum-plastic film, the waterproof layer 20 is used to block water vapor, and calcium hydroxide is used to absorb the slightly entering water vapor to improve the waterproof performance of the film; by setting anhydrous copper sulfate in the water content indicating layer 40, when the aluminum-plastic film 70 is damaged, based on the principle that anhydrous copper sulfate absorbs water and changes color, by observing the color change of the water content indicating layer 40, it can be judged whether water vapor enters the water content indicating layer 40, which is convenient for timely detecting whether the battery is flooded and timely replacing the battery, improving the use safety.

[0087] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made to the above embodiments according to the technical reality of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An aluminum-plastic film packaging film for sulfide solid-state batteries, characterized in that: It comprises an adhesive layer (10), a waterproof layer (20), a core layer (30), a water content indicating layer (40), and a heat sealing layer (50); The adhesive layer (10) is maleic anhydride modified polypropylene resin; The waterproof layer (20) is formed by blending maleic anhydride modified polypropylene resin, binary random copolymer polypropylene, ethylene or propylene based elastomer and calcium hydroxide; The core layer (30) is formed by blending block polypropylene, ethylene or propylene-based elastomer and calcium hydroxide; The water content indicating layer (40) is formed by blending binary random copolymer polypropylene, ethylene or propylene-based elastomer and anhydrous copper sulfate modified body; The heat sealing layer (50) is formed by blending binary random copolymer polypropylene or ternary copolymer polypropylene, ethylene-based or propylene-based elastomer and a lubricant.

2. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 1, characterized in that: The thickness of the adhesive layer (10) is 3-25 μm; The waterproof layer (20) has a thickness of 3-12.5 μm; The thickness of the core layer (30) is 18-75 μm; The thickness of the water content indicating layer (40) is 3-12.5 μm; The thickness of the heat sealing layer (50) is 3-25 μm.

3. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 1, characterized in that: The maleic anhydride modified polypropylene resin of the adhesive layer (10) and the waterproof layer (20) both have melting points of 140°C to 160°C, melt indices of 3 to 8 g / 10 min, and Vicat softening points of 110°C to 150°C.

4. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 1, characterized in that: The weight percentage of maleic anhydride modified polypropylene resin in the waterproof layer (20) is 32.5%-52.5%, the weight percentage of copolymerized polypropylene is 30%-39%, the weight percentage of ethylene or propylene elastomer is 10%-30%, and the weight percentage of calcium hydroxide is 1%-5%. The sum of the proportions of each component is 100%.

5. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 1, characterized in that: The weight percentage of the block polypropylene in the core layer (30) is 70%-90%, the weight percentage of the ethylene or propylene elastomer is 9.5%-29%, the weight percentage of calcium hydroxide is 0.5%-1%, and the sum of the proportions of each component is 100%.

6. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 1, characterized in that: The fineness of the calcium hydroxide in the waterproof layer (20) and the core layer (30) is both ≥1200 meshes and the purity is both ≥95%.

7. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 1, characterized in that: The weight percentage of binary random copolymer polypropylene in the moisture content indicating layer (40) is 60%-90%, the weight percentage of ethylene or propylene elastomer is 9%-30%, the weight percentage of anhydrous copper sulfate modifier is 1%-10%, and the sum of the proportions of each component is 100%.

8. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 7, characterized in that: The preparation method of the anhydrous copper sulfate modifier comprises: dissolving anhydrous copper sulfate amorphous powder in a polyacrylamide aqueous solution with a mass concentration of 0.1%-0.3%, wherein the mass concentration of the anhydrous copper sulfate in the polyacrylamide aqueous solution is 0.5%-2%, and then drying at 130°C-150°C to obtain an anhydrous copper sulfate modifier raw material; and grinding and sieving the anhydrous copper sulfate modifier raw material to obtain the anhydrous copper sulfate modifier.

9. The encapsulation film of an aluminum-plastic film for a sulfide solid-state battery according to claim 8, characterized in that: The fineness of the anhydrous copper sulfate modifier is ≥600 mesh.

10. The encapsulation film of aluminum-plastic film for sulfide solid-state battery according to claim 1, characterized in that: The weight percentage of copolymerized polypropylene in the heat sealing layer (50) is 69%-90%, the weight percentage of ethylene or propylene elastomer is 9.5%-30%, and the weight percentage of lubricant is 0.5%-1%. The sum of the proportions of each component is 100%.

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