Corrosion-resistant aluminum plastic film

Abstract

The utility model discloses a corrosion-resistant aluminum plastic film. Comprising a first heat-resistant resin film layer, a first bonding layer, a second heat-resistant resin film layer, a second bonding layer, a first aluminum foil layer, a third bonding layer, a second aluminum foil layer, a fourth bonding layer, a PP layer, a fifth bonding layer, a third aluminum foil layer, a sixth bonding layer, a fourth aluminum foil layer, a seventh bonding layer and a thermoplastic resin film layer which are sequentially arranged from top to bottom. According to the utility model, a multi-layer aluminum foil structure is adopted, so that the total thickness of the aluminum foil is increased, more aluminum residues and better corrosion resistance are ensured when the angular stretching degree is too large after the aluminum-plastic film is punched into a shell, and liquid leakage caused by electrolyte corrosion is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum-plastic films for lithium batteries, in particular to a corrosion-resistant aluminum-plastic film. Background Art

[0002] Aluminum-plastic film, as a packaging material for soft-pack batteries, offers advantages such as light weight, thinness, and flexible design. It plays a crucial role in protecting the core of lithium-ion batteries. Traditional aluminum-plastic film typically consists of an outer nylon layer, an intermediate aluminum foil layer, and an inner heat-seal layer. However, due to the thin aluminum foil thickness of traditional aluminum-plastic film, excessive stretching at the corners after punching can result in insufficient aluminum residue, poor corrosion resistance, and susceptibility to electrolyte corrosion, leading to leakage. Utility Model Content

[0003] The utility model aims to solve the deficiencies in the prior art and provides a corrosion-resistant aluminum-plastic film. The multi-layer aluminum foil structure is adopted to increase the overall thickness of the aluminum foil, ensuring that more aluminum residue will remain when the angle of the aluminum-plastic film is stretched too much after punching, thereby improving corrosion resistance and preventing leakage.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A corrosion-resistant aluminum-plastic film comprises a second heat-resistant resin film layer, a second adhesive layer, a first aluminum foil layer, a third adhesive layer, a second aluminum foil layer, a fourth adhesive layer, a first PP layer, a fifth adhesive layer, a third aluminum foil layer, a sixth adhesive layer, a fourth aluminum foil layer, a seventh adhesive layer, and a thermoplastic resin film layer, which are arranged in sequence from top to bottom.

[0006] By adopting an aluminum-plastic film composed of a second heat-resistant resin film layer, a second adhesive layer, a first aluminum foil layer, a third adhesive layer, a second aluminum foil layer, a fourth adhesive layer, a first PP layer, a fifth adhesive layer, a third aluminum foil layer, a sixth adhesive layer, a fourth aluminum foil layer, a seventh adhesive layer, and a thermoplastic resin film layer, which are arranged in sequence from top to bottom, the aluminum-plastic film has a four-layer aluminum foil structure, which increases the overall thickness of the aluminum foil, thereby ensuring that more aluminum residue is left when the degree of corner stretching is too large after the aluminum-plastic film is punched into a shell, and the corrosion resistance is better, thereby preventing leakage caused by corrosion by electrolyte.

[0007] As a preferred solution, an electrolyte corrosion resistant coating is provided on a side of the thermoplastic resin film layer away from the seventh adhesive layer, and the thickness of the electrolyte corrosion resistant coating is 0.3 μm to 1 μm.

[0008] As a preferred solution, the electrolyte corrosion-resistant coating is one or more of polyvinylidene fluoride coating, aramid coating, carboxymethyl cellulose coating, styrene-butadiene rubber coating, polyvinyl alcohol coating, and polytetrafluoroethylene coating.

[0009] As a preferred solution, the second adhesive layer is a two-component polyurethane adhesive with a thickness of 3 μm to 5 μm.

[0010] As a preferred solution, the first aluminum foil layer is an O-state aluminum foil with a passivation layer on the surface, and the thickness thereof is 48 μm to 56 μm.

[0011] As a preferred solution, the third adhesive layer is an acid-modified polyolefin adhesive with a thickness of 0.3 μm to 2 μm.

[0012] As a preferred solution, the thickness of the second aluminum foil layer and the third aluminum foil layer are both 3 μm to 5 μm.

[0013] As a preferred solution, the fourth aluminum foil layer is an O-state aluminum foil with a passivation layer on the surface, and its thickness is 6 μm to 30 μm.

[0014] As a preferred solution, the second heat-resistant resin film layer is provided with a first heat-resistant resin film layer and a first adhesive layer in sequence from top to bottom on a side away from the second adhesive layer, and the thickness of the first heat-resistant resin film layer is 1.9 μm to 6 μm.

[0015] As a preferred solution, the thickness of the corrosion-resistant aluminum-plastic film is 100 μm to 220 μm.

[0016] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, by adopting an aluminum-plastic film composed of a second heat-resistant resin film layer, a second adhesive layer, a first aluminum foil layer, a third adhesive layer, a second aluminum foil layer, a fourth adhesive layer, a first PP layer, a fifth adhesive layer, a third aluminum foil layer, a sixth adhesive layer, a fourth aluminum foil layer, a seventh adhesive layer, and a thermoplastic resin film layer which are arranged in sequence from top to bottom, the aluminum-plastic film has a four-layer aluminum foil structure, which increases the overall thickness of the aluminum foil, thereby ensuring that more aluminum residue is left when the degree of corner stretching is too large after the aluminum-plastic film is punched into a shell, and the corrosion resistance is better, thereby preventing leakage caused by corrosion by electrolyte.

[0017] In order to more clearly illustrate the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an embodiment of the present utility model.

[0019] Description of the accompanying drawings:

[0020] 1-first heat-resistant resin film layer, 2-first adhesive layer, 3-second heat-resistant resin film layer, 4-second adhesive layer, 5-first aluminum foil layer, 6-third adhesive layer, 7-second aluminum foil layer, 8-fourth adhesive layer, 9-first PP layer, 10-fifth adhesive layer, 11-third aluminum foil layer, 12-sixth adhesive layer, 13-fourth aluminum foil layer, 14-seventh adhesive layer, 15-thermoplastic resin film layer, 16-electrolyte corrosion-resistant coating. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0023] like Figure 1 As shown, the utility model discloses a corrosion-resistant aluminum-plastic film, comprising a first heat-resistant resin film layer 1, a first adhesive layer 2, a second heat-resistant resin film layer 3, a second adhesive layer 4, a first aluminum foil layer 5, a third adhesive layer 6, a second aluminum foil layer 7, a fourth adhesive layer 8, a first PP layer 9, a fifth adhesive layer 10, a third aluminum foil layer 11, a sixth adhesive layer 12, a fourth aluminum foil layer 13, a seventh adhesive layer 14, a thermoplastic resin film layer 15, and an electrolyte corrosion-resistant coating 16, which are arranged in sequence from top to bottom.

[0024] The first heat-resistant resin film layer 1 is a PET layer with a thickness of 1.9 μm to 6 μm.

[0025] The first adhesive layer 2 is a two-component polyurethane adhesive with a thickness of 3 μm to 5 μm.

[0026] The second heat-resistant resin film layer 3 is a PA layer, and its thickness is 15 μm to 25 μm.

[0027] The second adhesive layer 4 is a two-component polyurethane adhesive with a thickness of 3 μm to 5 μm.

[0028] The first aluminum foil layer 5 is an O-state aluminum foil with a passivation layer on the surface, and its thickness is 48 μm to 56 μm. It should be pointed out that the O-state aluminum foil refers to an aluminum foil product with lower strength obtained through annealing.

[0029] The third adhesive layer 6 is an acid-modified polyolefin adhesive, and its thickness is 0.3 μm to 2 μm.

[0030] The thickness of the second aluminum foil layer 7 and the third aluminum foil layer 11 are both 3 μm to 5 μm.

[0031] The thickness of the first PP layer 9 is 8 μm to 18 μm.

[0032] The fourth adhesive layer 8 and the fifth adhesive layer 10 are both acid-modified polyolefin adhesives, and the thickness of the fourth adhesive layer 8 and the fifth adhesive layer 10 are both 0.5 μm to 1 μm.

[0033] The sixth adhesive layer 12 is an acid-modified polyolefin adhesive, and has a thickness of 0.3 μm to 2 μm.

[0034] The fourth aluminum foil layer 13 is an O-state aluminum foil with a passivation layer on the surface, and has a thickness of 6 μm to 30 μm.

[0035] The seventh adhesive layer 14 is an acid-modified polyolefin adhesive and has a thickness of 0.3 μm to 2 μm.

[0036] The thermoplastic resin film layer 15 is a second PP layer, and its thickness is 30 μm to 48 μm.

[0037] The electrolyte corrosion-resistant coating 16 is an electrolyte corrosion-resistant coating with a thickness of 0.3 μm to 1 μm. By adding the electrolyte corrosion-resistant coating 16, the electrolyte corrosion-resistant coating 16 is used to isolate the electrolyte from the thermoplastic resin film layer 15, avoiding direct contact between the electrolyte and the thermoplastic resin film layer 15, extending the life of the thermoplastic resin film layer 15, and further improving the corrosion resistance of the aluminum-plastic film.

[0038] The electrolyte corrosion-resistant coating 16 is one or more of a water-based polyvinylidene fluoride (PVDF) coating, an aramid coating, a carboxymethyl cellulose (CMC) coating, a styrene-butadiene rubber (SBR) coating, a polyvinyl alcohol (PVA) coating, and a polytetrafluoroethylene (PTFE) coating.

[0039] The thickness of the corrosion-resistant aluminum-plastic film is 100 μm to 220 μm. It should be noted that the thickness in the present invention is defined as the distance between the upper and lower surfaces of the product.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical practice of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A corrosion-resistant aluminum-plastic film, characterized in that: The invention comprises a second heat-resistant resin film layer (3), a second adhesive layer (4), a first aluminum foil layer (5), a third adhesive layer (6), a second aluminum foil layer (7), a fourth adhesive layer (8), a first PP layer (9), a fifth adhesive layer (10), a third aluminum foil layer (11), a sixth adhesive layer (12), a fourth aluminum foil layer (13), a seventh adhesive layer (14), and a thermoplastic resin film layer (15) which are arranged in sequence from top to bottom.

2. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: An electrolyte corrosion resistant coating (16) is provided on the side of the thermoplastic resin film layer (15) away from the seventh adhesive layer (14), and the thickness of the electrolyte corrosion resistant coating (16) is 0.3 μm to 1 μm.

3. The corrosion-resistant aluminum-plastic film according to claim 2, characterized in that: The electrolyte corrosion resistant coating (16) is one or more of a polyvinylidene fluoride coating, an aramid coating, a carboxymethyl cellulose coating, a styrene-butadiene rubber coating, a polyvinyl alcohol coating, and a polytetrafluoroethylene coating.

4. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: The second adhesive layer (4) is a two-component polyurethane adhesive with a thickness of 3 μm to 5 μm.

5. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: The first aluminum foil layer (5) is an O-state aluminum foil with a passivation layer on the surface, and its thickness is 48 μm to 56 μm.

6. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: The third adhesive layer (6) is an acid-modified polyolefin adhesive and has a thickness of 0.3 μm to 2 μm.

7. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: The thickness of the second aluminum foil layer (7) and the third aluminum foil layer (11) are both 3 μm to 5 μm.

8. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: The fourth aluminum foil layer (13) is an O-state aluminum foil with a passivation layer on the surface, and its thickness is 6 μm to 30 μm.

9. The corrosion-resistant aluminum-plastic film according to claim 1, characterized in that: The side of the second heat-resistant resin film layer (3) away from the second adhesive layer (4) is provided with a first heat-resistant resin film layer (1) and a first adhesive layer (2) in sequence from top to bottom, and the thickness of the first heat-resistant resin film layer (1) is 1.9 μm to 6 μm.

10. The corrosion-resistant aluminum-plastic film according to any one of claims 1 to 9, characterized in that: The thickness of the corrosion-resistant aluminum-plastic film is 100 μm to 220 μm.

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