Battery cell insulating film

Abstract

The utility model discloses a battery cell insulating film which comprises a film body used for wrapping a battery cell, the film body is integrally designed and comprises a first large surface and a second large surface, four edges of the first large surface are respectively connected with a foldable top surface, a foldable bottom surface, a foldable left side surface and a foldable right side surface, and one side, far away from the first large surface, of the bottom surface is connected with the second large surface in a foldable manner; the sides, away from the first large face, of the top face, the left side face and the right side face are connected with a plurality of turnover pasting fixing belts. A battery cell liquid injection hole position window is formed in the left side surface close to the top surface, and an anti-explosion valve position window is formed in the right side surface close to the top surface; the middle parts of the left side surface and the right side surface are respectively provided with a battery cell pole position window, and a battery cell polarity identification window is respectively arranged close to the bottom surface. According to the utility model, the problem that the insulating film is tilted after being attached can be effectively reduced, and the windowing width of the battery cell can be reduced on the premise of the same windowing area, so that the width of the PET film is reduced, and the heat transfer efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery core coating, and in particular relates to a battery core insulating film. Background Art

[0002] The battery cell insulation film is a thin film coated on the outer surface of the lithium battery cell. This insulating film is usually made of polymer materials, such as polypropylene or polyurethane. Its main function is to protect the battery cells inside the battery from damage by the external environment (such as scratches), and at the same time prevent the battery shell from contacting with external metal or other conductive objects and causing a short circuit.

[0003] The battery cell insulation film currently in use adopts a split design of the surrounding surface and the pole surface. When the battery cell is coated with the insulation film, bubbles often appear, the insulation film is not firmly adhered, and the edges are warped. In order to fix the battery cell in the existing products, holes are made where the insulation film needs to be adhered. At the same time, in order to insulate the battery cell shell from the battery tray, there is generally an additional PET film in the window area of ​​the insulation film to separate the battery cell from the battery tray. However, the battery cell windows are currently more dispersed, resulting in a larger width of the battery cell windows, which correspondingly leads to a larger width of the PET film, increasing the thermal resistance of the heat transfer path, which is not conducive to the heat exchange of the thermal management system of the battery pack. Utility Model Content

[0004] The purpose of the utility model is to provide a battery cell insulating film, which can effectively reduce the problem of the insulating film warping after attachment. Under the premise of the same window area, the battery cell window width can be reduced, thereby reducing the width of the PET film and increasing the heat transfer efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a battery cell insulating film, comprising a film body for wrapping a battery cell, the film body being of an integrated design, comprising a first large surface and a second large surface, the four sides of the first large surface being respectively connected with a foldable top surface, a bottom surface, a left side surface and a right side surface, and the side of the bottom surface away from the first large surface being foldably connected to the second large surface;

[0006] The top surface, the left side surface and the right side surface are connected to a plurality of foldable adhesive fixing belts on the side away from the first large surface;

[0007] The left side surface is provided with a window for the battery cell injection hole near the top surface, and the right side surface is provided with a window for the explosion-proof valve near the top surface;

[0008] The left side and the right side are respectively provided with battery cell pole position windows in the middle, and battery cell polarity identification windows are respectively provided near the bottom.

[0009] As a further solution of the utility model: a plurality of circular holes are opened on the top surface, and a foldable sealing edge is connected to a side of the second large surface away from the bottom surface.

[0010] As a further solution of the utility model: waist-shaped holes are provided at both ends of the bottom surface.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] The problem of the insulation film being easily warped due to the loose adhesion of the insulation film of the battery cell caused by the surface of the battery cell not being cleaned can be effectively reduced by setting the adhesive fixing tape;

[0013] By setting up an integrated insulating film design, the position of the battery cell insulating film warping can be reduced, and at the same time, one material is reduced, thereby improving production efficiency;

[0014] A circular hole is opened on the top surface, exposing part of the outer surface of the battery cell, so that the edge seal can be directly pasted to the surface of the battery cell and fixed to the top surface, while ensuring that the battery cell shell is not exposed;

[0015] The bottom surface is used to fix to the battery tray, and waist-shaped holes are set at both ends. Compared with the original dispersed window openings, under the same window opening area and the same heat exchange conditions, the heat exchange effect can be effectively improved. It is highly practical and suitable for wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the battery cell insulation film.

[0017] Figure 2 It is a schematic diagram of the usage status of the battery cell insulation film.

[0018] In the figure: 1. The first large surface, 2. The bottom surface, 3. The second large surface, 4. The edge sealing, 5. The waist-shaped hole, 6. The window for the polarity mark of the battery cell, 7. The right side, 8. The window for the position of the battery cell pole, 9. The window for the position of the explosion-proof valve, 10. The top surface, 11. The circular hole, 12. The left side, 13. The window for the position of the battery cell injection hole, 14. The adhesive fixing tape, 15. The battery cell. DETAILED DESCRIPTION

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] like Figure 1 and Figure 2 As shown, the battery cell insulating film includes a film body for wrapping the battery cell 15, and the specific material can be determined according to the needs. The contact surface between the battery cell insulating film and the battery cell 15 is provided with adhesive, which is convenient for sticking to the battery cell 15. The film body is integrated, including a first large surface 1 and a second large surface 3. The four sides of the first large surface 1 are respectively connected with a foldable top surface 10, a bottom surface 2, a left side surface 12 and a right side surface 7. The side of the bottom surface 2 away from the first large surface 1 can be folded and connected to the second large surface 3;

[0021] The top surface 10, the left side surface 12 and the right side surface 7 are connected to a plurality of foldable adhesive fixing tapes 14 on the side away from the first large surface 1. The adhesive fixing tapes 14 have adhesive backing near the battery cell 15 and can be attached to the surface of the battery cell 15 to firmly fix the membrane body without relative displacement.

[0022] The left side surface 12 is provided with a battery cell injection hole opening window 13 near the top surface 10, and the right side surface 7 is provided with an explosion-proof valve opening window 9 near the top surface 10;

[0023] The left side surface 12 and the right side surface 7 are respectively provided with battery cell pole position windows 8 in the middle, and battery cell polarity identification windows 6 are respectively provided near the bottom surface 2 .

[0024] Furthermore, a plurality of circular holes 11 are provided on the top surface 10, and a foldable sealing edge 4 is connected to the side of the second large surface 3 away from the bottom surface 2. When the battery cell 15 is wrapped, a portion of the outer surface of the battery cell can be exposed through the circular holes 11, so that the sealing edge 4 can be directly adhered to the surface of the battery cell and firmly fixed to the top surface 10, while ensuring that the battery cell shell will not be exposed.

[0025] Since the bottom surface 2 needs to be fixed to the battery tray, further, waist-shaped holes 5 are opened at both ends of the bottom surface 2 to facilitate pasting and fixing. At the same time, compared with the original scattered windows, the heat exchange effect can be effectively improved under the same window area and the same heat exchange conditions.

[0026] When the utility model is actually used, when the insulating film is wrapped around the battery cell, the battery cell 15 is first wrapped on the top surface 10 (or the left side surface 12 and the right side surface 7 with the adhesive fixing tape 14), and then the left side surface 12 and the right side surface 7 are wrapped, and the adhesive fixing tape 14 is pasted on the battery cell 15, and finally the wrapping is completed using the edge sealing 4.

Claims

1. A battery cell insulation film, comprising a film body for wrapping a battery cell (15), characterized in that: The membrane body is of an integrated design and comprises a first large surface (1) and a second large surface (3); the first large surface (1) is respectively connected to a foldable top surface (10), a bottom surface (2), a left side surface (12) and a right side surface (7) on four sides; the side of the bottom surface (2) away from the first large surface (1) is foldably connected to the second large surface (3); A plurality of foldable adhesive fixing belts (14) are connected to the top surface (10), the left side surface (12) and the right side surface (7) on the side away from the first large surface (1); The left side surface (12) is provided with a window (13) at the position of the battery cell injection hole close to the top surface (10), and the right side surface (7) is provided with a window (9) at the position of the explosion-proof valve close to the top surface (10); The left side (12) and the right side (7) are respectively provided with battery cell pole position windows (8) in the middle, and battery cell polarity identification windows (6) are respectively provided near the bottom surface (2).

2. The battery core insulating film according to claim 1, characterized in that: A plurality of circular holes (11) are provided on the top surface (10), and a foldable sealing edge (4) is connected to the side of the second large surface (3) away from the bottom surface (2).

3. The battery core insulating film according to claim 1 or 2, characterized in that: Waist-shaped holes (5) are provided at both ends of the bottom surface (2).

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