Battery cell protective film

Abstract

The invention discloses a battery cell protective film which comprises an inner film layer and an outer film layer which are arranged in sequence, the inner film layer comprises an upper base material layer, a lower base material layer and a heat insulation layer, the heat insulation layer is arranged between the upper base material layer and the lower base material layer, and air holes penetrating through the upper base material layer, the lower base material layer and the heat insulation layer are formed in the inner film layer; the outer film layer comprises a protective film, an insulating film layer and an antistatic film layer which are arranged in sequence, slots penetrating through the protective film, the insulating film layer and the antistatic film layer are formed in the outer film layer, and the slots correspond to the air holes; the battery cell protection film is arranged to be of the double-layer structure composed of the inner film layer and the outer film layer, the battery cell protection film is arranged outside the battery cell, the effect of protecting the battery cell is achieved, the heat insulation layer is arranged in the interlayer of the inner film layer, the external temperature is isolated through the heat insulation layer, and the heat insulation effect is achieved; the slots correspond to the air holes, and the width of the slots is smaller than the aperture of the air holes, so that heat dissipation of the battery cell is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of battery core protection films, and in particular to a battery core protection film. Background Art

[0002] At present, in order to prevent the aluminum-plastic film from being scratched by sharp objects or other foreign objects during the battery manufacturing process, all soft-pack batteries will have a layer of battery protection film attached to the surface of the main body after the battery is packaged to protect the appearance of the battery. The battery protection film is a protective film used to wrap around the outside of the battery to protect the outside of the battery. Traditional battery protection films are usually made of PET. If the battery protection film is not firmly attached to the protected product during use, the product will fall off during transportation and use. Therefore, the bonding performance of the battery protection film has become an important indicator for selecting the battery protection film.

[0003] The existing technology has the following disadvantages: the existing battery cell protection film has poor antistatic effect, resulting in low safety of product protection during use; and most of the existing battery cell protection films do not have heat insulation properties, which will affect the performance of the battery cell when the external temperature environment is high. Summary of the invention

[0004] The purpose of the present invention is to provide a battery cell protection film in order to solve the above problems.

[0005] The present invention achieves the above-mentioned object through the following technical scheme: a battery cell protective film, comprising a structural body, the structural body comprising an inner film layer and an outer film layer arranged in sequence, the outer film layer being arranged on the upper surface of the inner film layer;

[0006] The inner film layer comprises an upper substrate layer, a lower substrate layer and a heat insulation layer, wherein the heat insulation layer is arranged between the upper substrate layer and the lower substrate layer, and the inner film layer is provided with air holes penetrating the upper substrate layer, the lower substrate layer and the heat insulation layer;

[0007] The outer film layer comprises a protective film, an insulating film layer and an antistatic film layer which are arranged in sequence. The outer film layer is provided with slits which penetrate the protective film, the insulating film layer and the antistatic film layer, and the slits correspond to the pores.

[0008] Preferably, the surface of the substrate layer is coated with an adhesive layer, the thickness of the substrate layer is 25-50 μm, and the thickness of the adhesive layer is 8-22 μm.

[0009] Preferably, the protective film is a PET protective film, and the thickness of the PET protective film is 15-30 μm.

[0010] Preferably, the insulating film layer is made of a material selected from the group consisting of polyamide PA, polypropylene PP, polyurethane PUR, and polyunsaturated fatty acid PFA.

[0011] Preferably, the insulating film layer is formed by mixing multiple materials selected from the group consisting of polyamide PA, polypropylene PP, polyurethane PUR, and polyunsaturated fatty acids PFA.

[0012] Preferably, the thickness of the insulating film layer is 12-28 μm.

[0013] Preferably, the antistatic film layer is composed of a polyester base layer and an antistatic coating layer coated on the polyester base layer.

[0014] Preferably, the pores have a diameter of 1-3 μm.

[0015] Preferably, the antistatic film layer is disposed on the upper surface of the upper substrate layer.

[0016] The beneficial effects of the present invention are:

[0017] 1. The battery cell protection film is set as a double-layer structure consisting of an inner film layer and an outer film layer, and the battery cell protection film is set outside the battery cell, thereby protecting the battery cell;

[0018] 2. The inner film layer is set as a sandwich structure consisting of an upper substrate layer, a lower substrate layer and a heat insulation layer, and the heat insulation layer is set between the upper substrate layer and the lower substrate layer, and the heat insulation layer is isolated from the external temperature, thereby playing a heat insulation role;

[0019] 3. Through the setting of the antistatic film layer, the antistatic film layer is composed of a polyester base layer and an antistatic coating coated on the polyester base layer, so that the antistatic effect of the battery protection film is better;

[0020] 4. The corresponding arrangement of the slots and the pores, with the width of the slots being smaller than the aperture of the pores, is beneficial to the heat dissipation of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the battery protection film of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of the battery protection film of the present invention;

[0023] Figure 3 This is a cross-sectional view of the battery cell protection film of the present invention.

[0024] In the figure:

[0025] 1. Inner film layer; 2. Outer film layer; 3. Upper substrate layer; 4. Heat insulation layer; 5. Lower substrate layer; 6. Protective film; 7. Insulating film layer; 8. Antistatic film layer; 9. Air holes; 10. Slots. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-3 As shown:

[0028] In the present embodiment, a battery cell protection film includes a structural body, which includes an inner film layer 1 and an outer film layer 2 which are arranged in sequence, and the outer film layer 2 is laminated on the upper surface of the inner film layer 1. The battery cell protection film is arranged as a double-layer structure composed of the inner film layer 1 and the outer film layer 2, and the battery cell protection film is arranged outside the battery cell, so as to protect the battery cell; the inner film layer 1 includes an upper substrate layer 3, a lower substrate layer 5 and a thermal insulation layer 4, and the thermal insulation layer 4 is arranged between the upper substrate layer 3 and the lower substrate layer 5. The inner film layer 1 is provided with pores 9 which penetrate the upper substrate layer 3, the lower substrate layer 5 and the thermal insulation layer 4. The arrangement of the thermal insulation layer 4 is beneficial for the thermal insulation layer 4 to isolate the lower substrate layer from the external temperature. The material layer 5 has the effect of heat insulation; the outer film layer 2 includes a protective film 6, an insulating film layer 7 and an antistatic film layer 8 which are arranged in sequence; the outer film layer 2 is provided with a slit 10 which penetrates the protective film 6, the insulating film layer 7 and the antistatic film layer 8; the antistatic film layer 8 is arranged on the upper surface of the upper substrate layer 3; the slit 10 corresponds to the pore 9; the width of the slit 10 is smaller than the aperture of the pore 9, which is beneficial to the heat dissipation of the battery cell; through the setting of the antistatic film layer 8, the antistatic film layer 8 is composed of a polyester base layer and an antistatic coating which is coated on the polyester base layer, so that the antistatic effect of the battery cell protective film is better; the surface of the protective film 6 is provided with a carbon crystal wear-resistant layer, which plays a role of wear resistance and scratch resistance.

[0029] It should be noted that the surface of the substrate layer 3 is coated with an adhesive layer, the thickness of the substrate layer 3 is 25-50 μm, and the thickness of the adhesive layer is 8-22 μm.

[0030] It should be noted that the protective film 6 is a PET protective film, and the thickness of the PET protective film is 15-30 μm.

[0031] It should be noted that the insulating film layer 7 is made of one material selected from the group consisting of polyamide PA, polypropylene PP, polyurethane PUR, polyunsaturated fat and acid PFA; or the insulating film layer 7 is made of a mixture of multiple materials selected from the group consisting of polyamide PA, polypropylene PP, polyurethane PUR, polyunsaturated fat and acid PFA; the thickness of the insulating film layer 7 is 12-28 μm, which plays an insulating role.

[0032] It should be noted that the antistatic film layer 8 is composed of a polyester base layer and an antistatic coating layer coated on the polyester base layer, so that the antistatic effect of the battery cell protection film is better.

[0033] It should be noted that the diameter of the pore 9 is 1-3 μm, and the width of the slot 10 is smaller than the diameter of the pore 9 .

[0034] Working principle:

[0035] The battery cell protection film is provided as a double-layer structure consisting of an inner film layer and an outer film layer, and the battery cell protection film is provided outside the battery cell, thereby protecting the battery cell. Meanwhile, the inner film layer is provided as a sandwich structure consisting of an upper substrate layer, a lower substrate layer and a heat insulation layer, and the heat insulation layer is provided between the upper substrate layer and the lower substrate layer, and the heat insulation layer is used to isolate the external temperature, thereby providing heat insulation. The antistatic film layer is provided, and the antistatic film layer is composed of a polyester base layer and an antistatic coating coated on the polyester base layer, thereby providing better antistatic effect of the battery cell protection film.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A battery cell protective film, characterized in that: The invention comprises a structural body, wherein the structural body comprises an inner film layer (1) and an outer film layer (2) which are arranged in sequence, and the outer film layer (2) is arranged on the upper surface of the inner film layer (1); The inner film layer (1) comprises an upper substrate layer (3), a lower substrate layer (5) and a heat insulation layer (4); the heat insulation layer (4) is arranged between the upper substrate layer (3) and the lower substrate layer (5); and the inner film layer (1) is provided with pores (9) penetrating the upper substrate layer (3), the lower substrate layer (5) and the heat insulation layer (4); The outer film layer (2) comprises a protective film (6), an insulating film layer (7) and an antistatic film layer (8) which are arranged in sequence, and a slit (10) penetrating the protective film (6), the insulating film layer (7) and the antistatic film layer (8) is provided on the outer film layer (2), and the slit (10) corresponds to the pore (9).

2. A battery cell protective film according to claim 1, characterized in that: The surface of the substrate layer (3) is coated with an adhesive layer, the thickness of the substrate layer (3) is 25-50 μm, and the thickness of the adhesive layer is 8-22 μm.

3. The battery cell protective film according to claim 1, characterized in that: The protective film (6) is a PET protective film, and the thickness of the PET protective film is 15-30 μm.

4. The battery cell protective film according to claim 1, characterized in that: The insulating film layer (7) is made of a material selected from the group consisting of polyamide PA, polypropylene PP, polyurethane PUR, and polyunsaturated fatty acid PFA.

5. The battery cell protective film according to claim 1, characterized in that: The insulating film layer (7) is formed by mixing a plurality of materials selected from the group consisting of polyamide PA, polypropylene PP, polyurethane PUR, polyunsaturated fat and acid PFA.

6. The battery cell protective film according to claim 1, characterized in that: The thickness of the insulating film layer (7) is 12-28 μm.

7. The battery cell protective film according to claim 1, characterized in that: The antistatic film layer (8) is composed of a polyester base layer and an antistatic coating layer coated on the polyester base layer.

8. The battery cell protective film according to claim 1, characterized in that: The pores (9) have a diameter of 1-3 μm.

9. The battery cell protective film according to claim 1, characterized in that: The antistatic film layer (8) is arranged on the upper surface of the upper substrate layer (3).

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