Integrated battery cell shell envelope waterproof device, battery cell and battery module

Abstract

The utility model discloses an integral type electric core shell film -coated waterproof device, electric core and battery module, including the film -coated that covers electric core shell outside, and the film -coated includes the waterproof sealing layer, heat shrinkage film and wear -resistant coating that set gradually along the electric core thickness direction, and the waterproof sealing layer contacts electric core shell, the utility model discloses an integral type film -coated is carried out to electric core shell through adopting heat shrinkage material, has the following advantages: completely eliminate capillary phenomenon: adopt integral type film -coated no seam and pore, can effectively prevent moisture and penetrate electric core shell through capillary phenomenon, simple process: heat shrinkage material film can through heating fast contraction and stick electric core shell, and process simple and good consistency is suitable for large -scale production, multifunctionality: can add waterproof sealant and wear -resistant coating optionally, further promote the security and durability of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery safety technology, specifically to an integrated waterproof coating device for battery cell casing, a battery cell, and a battery module. Background Technology

[0002] With the increasing popularity of electric vehicles, their safety and reliability have become a growing concern. The battery system of an electric vehicle is typically installed in a battery box located at the bottom of the vehicle, and the sealing and waterproofing performance of this battery box directly affects the safe operation of the battery system.

[0003] However, in actual use, the battery compartment may become flooded for various reasons. If the system fails to detect insulation problems in time, or if the owner fails to repair the insulation issues promptly, water may seep into the battery cell casing through capillary action, leading to serious safety issues such as casing corrosion, decreased insulation performance, and even thermal runaway. Since vehicles inevitably experience water ingress due to impacts and other factors during use, effectively isolating water from the battery after flooding is a new approach to improving the safety and reliability of electric vehicles. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to prevent moisture from seeping into the cell casing through capillary action, thereby improving the safety and reliability of the battery.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] An integrated battery cell housing waterproofing device includes a membrane covering the outside of the battery cell housing. The membrane includes a waterproof sealing layer, a heat-shrinkable film, and a wear-resistant coating arranged sequentially along the thickness direction of the battery cell, wherein the waterproof sealing layer contacts the battery cell housing.

[0007] This invention utilizes a heat-shrinkable material to integrally coat the battery cell casing, offering the following advantages:

[0008] a) Completely eliminates capillary action: The one-piece encapsulation is seamless and pore-free, which can effectively prevent moisture from seeping into the cell casing through capillary action, avoiding the risk of casing corrosion and thermal runaway.

[0009] b) Simple process: The heat-shrinkable material film can be quickly shrunk by heating and adhered to the battery cell casing. The process is simple and has good consistency, making it suitable for large-scale production.

[0010] c) Versatility: Optional addition of waterproof sealant and abrasion-resistant coating further enhances battery safety and durability.

[0011] As a further aspect of this utility model, the heat shrink film is made of polyolefin heat shrink tubing as the substrate.

[0012] This application utilizes a heat-shrinkable material film that shrinks and tightly adheres to the surface of the battery cell casing after heating, forming an integrated encapsulation structure without seams or pores, thus fundamentally eliminating capillary action.

[0013] As a further aspect of this utility model, the heat shrink film is selected as a fluoropolymer heat shrink film as the substrate.

[0014] As a further embodiment of this utility model, the thickness of the heat-shrinkable film is 0.1 to 0.5 mm.

[0015] As a further embodiment of this invention, the wear-resistant coating is made of polyurethane.

[0016] This application involves coating the outer surface of a heat-shrinkable material film with a wear-resistant coating, such as polyurethane, to improve the mechanical strength of the film and prevent damage to the film due to friction or impact during use.

[0017] As a further aspect of this invention, the thickness of the wear-resistant coating is 20–50 micrometers.

[0018] As a further embodiment of this invention, the waterproof sealing layer is made of waterproof sealant.

[0019] This application coats a layer of waterproof sealant (such as silicone or polyurethane adhesive) on the inside of the heat-shrinkable material film to further enhance the sealing between the heat-shrinkable film and the battery cell housing; the waterproof sealant layer is evenly distributed during the heat-shrinking process, filling the tiny gaps between the heat-shrinkable film and the housing to ensure a complete seal.

[0020] As a further aspect of this invention, the thickness of the waterproof sealing layer is 10-50 micrometers.

[0021] This utility model also discloses a battery cell, including the aforementioned battery cell housing.

[0022] This utility model also discloses a battery module, which includes several of the above-mentioned battery cells. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of an integrated battery cell casing waterproofing device according to an embodiment of the present invention;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Coating; 101. Abrasion-resistant coating; 102. Heat-shrink film; 103. Waterproof sealing layer;

[0027] 2. Battery cell; 201. Battery cell casing. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] Example 1

[0030] Reference Figure 1 and Figure 2 An integrated battery cell housing waterproofing device includes a membrane 1. The membrane 1 includes a waterproof sealing layer 103, a heat shrink film 102, and a wear-resistant coating 101 arranged sequentially along the thickness direction of the battery cell. The waterproof sealing layer 103 contacts the battery cell housing, and the wear-resistant coating 101 is located on the outermost side away from the battery cell housing 201.

[0031] Reference Figure 2 The heat shrink film 102 is made of polyolefin heat shrink tubing with high waterproof, corrosion resistance and high temperature resistance, and has a thickness of 0.1 to 0.5 mm. By using heat shrink material to completely cover the battery cell housing 201, moisture is prevented from seeping into the battery cell housing through capillary action, thereby preventing housing corrosion and the risk of thermal runaway.

[0032] Alternatively, the heat shrink film 102 may be a fluoropolymer heat shrink film with high water resistance, corrosion resistance and high temperature resistance, and a thickness of 0.1 to 0.5 mm.

[0033] Reference Figure 2 The waterproof sealing layer 103 is coated with a layer of silicone or polyurethane adhesive on the inside of the heat-shrinkable material film to further enhance the sealing between the heat-shrinkable film and the battery cell housing. The waterproof sealing layer 103 will be evenly distributed during the heat shrinking process, filling the tiny gaps between the heat-shrinkable film and the housing to ensure a complete seal.

[0034] It should be noted that the thickness of the waterproof sealing layer 103 is 10 to 50 micrometers. During the heating process, the waterproof sealant will be evenly distributed and fill the tiny gaps between the heat shrink film 102 and the battery cell housing 201, forming a completely sealed integrated encapsulation structure.

[0035] Reference Figure 2The wear-resistant coating 101 is applied to the outer surface of the heat-shrinkable film with an anti-wear coating (such as a polyurethane coating) of 20-50 micrometers thickness. This coating is used to improve the mechanical strength of the film and prevent damage to the film due to friction or impact during use. During use, the heat-shrinkable film 102 shrinks and tightly adheres to the surface of the battery cell housing 201 after heating, forming an integrated covering structure without seams or pores, fundamentally eliminating capillary action.

[0036] The cell casing coating process is as follows:

[0037] First, the heat-shrink film 102 is cut to a shape that matches the size of the battery cell housing 201. Then, the heat-shrink film 102 is placed over the battery cell housing 201, ensuring complete coverage of the housing surface. Finally, the heat-shrink film is heated using a heat gun or oven to shrink and tightly adhere to the surface of the battery cell housing 201.

[0038] Example 2

[0039] Reference Figure 1 A battery cell includes a battery cell housing 201 as described in Embodiment 1, with a coating 1 covering the outside of the battery cell housing 201, and the battery cell housing 201 covering the outside of the battery cell.

[0040] Example 3

[0041] A battery module includes several groups of battery cells as shown in Example 2.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An integral cell case envelope waterproofing device, characterized by, The coating (1) covers the outside of the cell housing. The coating (1) includes a waterproof sealing layer (103), a heat shrink film (102) and a wear-resistant coating (101) arranged sequentially along the thickness direction of the cell, wherein the waterproof sealing layer (103) contacts the cell housing.

2. The one-piece cell case envelope waterproofing device of claim 1, wherein: The heat shrink film (102) is made of polyolefin heat shrink tubing as the substrate.

3. The one-piece cell case envelope waterproofing device of claim 1, wherein: The heat shrink film (102) is selected as a fluoropolymer heat shrink film as the substrate.

4. The one-piece cell case envelope waterproofing device of claim 2 or 3, wherein: The thickness of the heat shrink film (102) is 0.1 to 0.5 mm.

5. The one-piece cell case envelope waterproofing device of claim 1, wherein: The wear-resistant coating (101) is made of polyurethane.

6. The one-piece cell case envelope waterproofing device of claim 5, wherein: The thickness of the wear-resistant coating (101) is 20 to 50 micrometers.

7. The one-piece cell case envelope waterproofing device of claim 1, wherein: The waterproof sealing layer (103) is made of waterproof sealant.

8. The one-piece cell case envelope waterproofing device of claim 7, wherein: The thickness of the waterproof sealing layer (103) is 10-50 micrometers.

9. An electric cell characterized by Includes the integrated cell casing waterproofing device as described in any one of claims 1-8.

10. A battery module, characterized by It includes several battery cells as described in claim 9.

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