Reinforced cell edge protection film

Abstract

The utility model provides a kind of reinforced cell edge protection film, including edge reinforced protection film body, the edge reinforced protection film body is by protection film layer and constitutes three package angle edge strip, the inside surface of protection film layer is adhesive surface, the angle edge of protection film layer is integrally formed with anti-cracking reserved part. The utility model is fixed by the protection film layer of the edge reinforced protection film body in the edge position of cell, and the edge connecting position of film is wrapped and protected, the angle edge of protection film layer is integrally formed with anti-cracking reserved part, for accommodating thermal expansion and cold shrink of cell, avoid edge place to be torn apart;Buffer bulge is simultaneously provided on protection film layer for lateral buffering, to avoid cell excessive extrusion damage.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a reinforced edge protection film for battery cells. Background Technology

[0002] The purpose of the inner protective film inside the battery cell is to prevent the internal electrodes from directly contacting the aluminum shell if the core separator is punctured or damaged, which could lead to a short circuit, thermal runaway, fire, or explosion. However, during the cell coating process, the edges of the film are prone to curling, which can affect the battery's external insulation. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a reinforced edge protection film for battery cells, which more accurately solves the problems described above.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes a reinforced edge protection film for battery cells, including an edge-reinforced protective film body. The edge-reinforced protective film body is composed of a protective film layer forming a three-corner edge strip. The inner surface of the protective film layer is an adhesive surface. Anti-crack reserved parts are integrally formed on the corner edges of the protective film layer. The protective film layer is composed of an adsorption layer, a buffer layer and a wear-resistant layer. The adsorption layer is the inner layer, the buffer layer is the middle layer and the wear-resistant layer is the outer layer.

[0006] Furthermore, the inner surface of the adsorption layer is provided with an adsorption polymer coating, the buffer layer is a thermoplastic polyurethane and siloxane blended composite layer, radially arranged aramid nanofibers are embedded in the middle of the buffer layer, and the wear-resistant layer is a UV-cured ceramic reinforced coating.

[0007] Furthermore, the anti-crack reserved part has a cylindrical curved cross-section, and the diameter of the curved anti-crack reserved part is 2-3mm.

[0008] Furthermore, several protective film strips are integrally extended from the side of the protective film layer, and the ends of the protective film strips are integrally formed with enlarged portions.

[0009] Furthermore, the outer surface of the protective film layer is arrayed with several buffer bulges, each of which is composed of a buffer airbag embedded within the protective film layer, with the buffer airbag being built between the adsorption layer and the buffer layer.

[0010] The beneficial effects of this utility model are:

[0011] 1. This utility model fixes the protective film layer of the edge-reinforced protective film body to the edge position of the battery cell, wrapping and protecting the edge connection position of the film. The corner edge of the protective film layer is integrally formed with anti-crack reserved part to adapt to the thermal expansion and contraction of the battery cell and avoid cracking at the edge. At the same time, the protective film layer is provided with buffer bulge for lateral buffering to avoid damage to the battery cell due to excessive compression.

[0012] 2. The edge-reinforced protective film body of this utility model is composed of an adsorption layer, a buffer layer and a wear-resistant layer. The adsorption layer greatly improves the adhesion stability with the battery cell, the buffer layer provides excellent deformation resilience and resists mechanical impact in a directional manner, disperses stress to non-edge areas, reduces the risk of corner cracking, and the wear-resistant layer has high hardness and greatly improves scratch resistance. Attached Figure Description

[0013] Figure 1 This is a first three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention;

[0015] Figure 3 This is a front view of the structure of this utility model;

[0016] Figure 4 for Figure 3 Sectional view at point AA;

[0017] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0018] In the figure: 1. Edge-reinforced protective film body; 101. Protective film layer; 1011. Adsorption layer; 1012. Buffer layer; 1013. Wear-resistant layer; 102. Crack-resistant reserved part; 103. Protective film sub-strip; 1031. Enlarged part; 104. Buffer bulge; 1041. Buffer airbag. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] A reinforced edge protection film for a battery cell includes an edge reinforcement protection film body 1. The edge reinforcement protection film body 1 is characterized by a protective film layer 101 forming a three-cornered edge strip. The inner surface of the protective film layer 101 is an adhesive surface used to fix the protective film layer 101 to the edge of the battery cell, thus wrapping and protecting the edge connection position of the film. Several protective film sub-strips 103 extend integrally from the side of the protective film layer 101. An enlarged portion 1031 is integrally formed at the end of each protective film sub-strip 103. The protective film sub-strips 103 and the enlarged portion 1031 are used for extension and electrical bonding, improving the connection stability of the protective film layer 101.

[0022] The protective film layer 101 has an integrally formed anti-crack reserved part 102 on the corner edge. The anti-crack reserved part 102 has a cylindrical cross-section and a bending diameter of 2-3mm. Since the battery cell generates temperature when it is working, the anti-crack reserved part 102 is used to adapt to the thermal expansion and contraction of the battery cell and prevent the edge from being cracked.

[0023] Combination Figure 3 and Figure 4 As shown, a plurality of buffer bulges 104 are arranged in an array on the outer surface of the protective film layer 101. Each buffer bulge 104 is composed of a buffer airbag 1041 embedded in the protective film layer 101. The buffer airbag 1041 is built between the adsorption layer 1011 and the buffer layer 1012. The buffer airbag 1041 is used for lateral buffering to prevent the battery cell from being damaged by excessive compression.

[0024] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: This utility model fixes the protective film layer 101 of the edge-reinforced protective film body 1 to the edge position of the battery cell, and wraps and protects the edge connection position of the film. The corner edge of the protective film layer 101 is integrally formed with a crack-preserving part 102 to adapt to the thermal expansion and contraction of the battery cell and prevent the edge from being cracked. At the same time, a buffer bulge 104 is provided on the protective film layer 101 for lateral buffering to prevent the battery cell from being damaged by excessive compression.

[0025] Example 2

[0026] Combination Figure 4 and Figure 5As shown, the protective film layer 101 is composed of an adsorption layer 1011, a buffer layer 1012, and a wear-resistant layer 1013. The adsorption layer 1011 is the inner layer, the buffer layer 1012 is the middle layer, and the wear-resistant layer 1013 is the outer layer. The inner surface of the adsorption layer 1011 is coated with an adsorbent polymer with a microgrooved structure, which greatly improves the adhesion stability. The buffer layer 1012 is a composite layer of thermoplastic polyurethane and siloxane, providing ±15% deformation resilience. Radially arranged aramid nanofibers are embedded in the center of the buffer layer 1012 to resist mechanical impact in a directional manner, dispersing stress to non-edge areas during impact and reducing the risk of corner cracking. The wear-resistant layer 1013 is a UV-cured ceramic-reinforced coating with high hardness and greatly improved scratch resistance.

[0027] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: The edge-reinforced protective film body 1 in this utility model is composed of an adsorption layer 1011, a buffer layer 1012 and a wear-resistant layer 1013. The adsorption layer 1011 greatly improves the adhesion stability with the battery cell, the buffer layer 1012 provides excellent deformation resilience and resists mechanical impact in a directional manner, disperses stress to non-edge areas, and reduces the risk of corner cracking. The wear-resistant layer 1013 has high hardness and greatly improves scratch resistance.

[0028] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A reinforced edge protection film for battery cells, comprising an edge reinforcement protection film body (1), characterized in that, The edge-reinforced protective film body (1) is composed of a protective film layer (101) forming a three-corner edge strip. The inner side of the protective film layer (101) is an adhesive surface. The corner edge of the protective film layer (101) is integrally formed with a crack-resistant reserved part (102). The protective film layer (101) is composed of an adsorption layer (1011), a buffer layer (1012) and a wear-resistant layer (1013). The adsorption layer (1011) is the inner layer, the buffer layer (1012) is the middle layer, and the wear-resistant layer (1013) is the outer layer.

2. The reinforced cell edge protection film according to claim 1, characterized in that, The inner surface of the adsorption layer (1011) is provided with an adsorption polymer coating, the buffer layer (1012) is a thermoplastic polyurethane and siloxane blended composite layer, the buffer layer (1012) is embedded with radially arranged aramid nanofibers in the middle, and the wear-resistant layer (1013) is a UV-cured ceramic reinforced coating.

3. The reinforced cell edge protection film according to claim 1, characterized in that, The anti-crack reserved part (102) has a cylindrical curved cross-section, and the diameter of the curved anti-crack reserved part (102) is 2-3mm.

4. The reinforced cell edge protection film according to claim 1, characterized in that, A plurality of protective film strips (103) are integrally extended on the side of the protective film layer (101), and an enlarged portion (1031) is integrally formed at the end of the protective film strips (103).

5. The reinforced cell edge protection film according to claim 1, characterized in that, The outer surface of the protective film layer (101) is arranged with a plurality of buffer bulges (104), each of which is composed of a buffer airbag (1041) embedded in the protective film layer (101), and the buffer airbag (1041) is built between the adsorption layer (1011) and the buffer layer (1012).

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