Lithium ion battery roll core coating insulating film

Abstract

The utility model discloses a wrapping insulating film for a roll core of a lithium ion battery. The wrapping insulating film comprises a bottom surface wrapping film, two large surface wrapping films, four side surface wrapping films and a bottom supporting plate positioned at the bottom of the bottom surface wrapping film. The two large bread covering films are arranged on the two sides of the bottom bread covering film, the four side face covering films are arranged on the two sides of the two large bread covering films respectively, the four side face covering films are symmetrically arranged on the two sides of the two large bread covering films, the length of the bottom bread covering film is larger than that of the large bread covering films, and the length of the bottom bread covering film is larger than that of the large bread covering films. The two sides of the joint of the bottom surface covering film and the large surface covering film are arc angles. The design of the arc angle can avoid the problem of interference between the insulating film and the shell when the battery cell and the aluminum shell are assembled into the shell, so that the production efficiency and the qualification rate are improved. The bottom supporting plate is arranged to be I-shaped, and the design of the I-shaped bottom supporting plate can effectively support the battery cell, so that the insulating film is not easy to deform, and meanwhile, the material consumption is reduced, and the weight of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating films, and more specifically to an insulating film coated on a lithium ion battery core. Background Art

[0002] As a new generation of green secondary rechargeable batteries, lithium-ion batteries have been widely used in many fields such as electric vehicles, energy storage, and electronic equipment. Lithium-ion battery technology has also developed rapidly in recent years. Square aluminum shell batteries are one of the mainstream structures of lithium-ion batteries. During the production process, the semi-finished battery cells need to be assembled into a hard square aluminum shell. A layer of soft insulating film is usually used between the battery cell and the aluminum shell to cover the battery cell to prevent the battery cell from being scratched by the aluminum shell and to insulate it.

[0003] In the prior art, in order to improve the energy density of lithium-ion batteries, the space utilization rate inside the square aluminum shell is usually very high, which results in the size design of the insulating film being basically completely in line with the space size inside the aluminum shell. However, during the production of lithium-ion batteries, since the insulating film is soft and not easily plasticized, sharp corners often appear at the bottom corners, exceeding the size of the aluminum shell opening. During the shell insertion process, the protruding sharp corners at the bottom of the insulating film interfere with the aluminum shell, causing difficulty in shell insertion, damage to the insulating film and battery cells, and other problems. Utility Model Content

[0004] The purpose of the utility model is to provide a lithium-ion battery core-coated insulating film to solve the technical problems existing in the above-mentioned background technology.

[0005] The utility model provides a lithium-ion battery core wrapping insulating film, comprising a bottom wrapping film, two large wrapping films, four side wrapping films and a bottom support plate located at the bottom of the bottom wrapping film;

[0006] The two large covering films are arranged on both sides of the bottom covering film, the four side covering films are respectively arranged on both sides of the two large covering films, and the four side covering films are symmetrically arranged on both sides of the two large covering films. The length of the bottom covering film is greater than that of the large covering film, the bottom covering film is folded upward and connected to the side covering films, and the two sides of the connection between the bottom covering film and the large covering film are arc angles.

[0007] In a preferred embodiment, the radius of the arc angle is r, and Where b is the height of the large bread covering.

[0008] In a preferred embodiment, the length of the side coating film is a, and Where d is the width of the bottom coating film.

[0009] In a preferred embodiment, the length of the bottom support plate is adapted to the length of the large covering film, and the width of the bottom support plate is adapted to the width of the bottom covering film.

[0010] In a preferred embodiment, bonding points are provided on the bottom support plate and the bottom covering film, and the bottom support plate and the bottom covering film are bonded by hot-melt bonding.

[0011] In a preferred embodiment, the bottom support plate is configured to be in an I-shape.

[0012] In a preferred embodiment, positioning holes are correspondingly provided on the bottom supporting plate and the bottom covering film.

[0013] The beneficial effects of the technical solution of the utility model are:

[0014] The arc angle design can avoid the problem of interference between the insulating film and the shell when the battery cell and the aluminum shell are assembled into the shell, thereby improving production efficiency and qualified rate. The bottom support plate is set in an I-shaped shape. The design of the I-shaped bottom support plate can effectively support the battery cell, making the insulating film less likely to deform, while reducing the amount of materials used and reducing the weight of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the expansion diagram of the insulating film of the utility model.

[0016] Figure 2 This is the disassembly diagram of the structure of the utility model.

[0017] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0018] Explanation of the reference numerals: 1 bottom covering film, 2 large covering film, 3 side covering film, 4 bottom supporting plate, 5 bonding point, 6 positioning hole, 7 bottom through hole. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the sake of illustration and convenience of description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0020] like Figure 1-3As shown, the technical solution of the utility model provides a lithium-ion battery core coated insulating film, the thickness of the insulating film is 0.1-0.2mm, including a bottom coating film 1, two large coating films 2, four side coating films 3 and a bottom support plate 4 located at the bottom of the bottom coating film 1;

[0021] The two large covering films 2 are arranged on both sides of the bottom covering film 1, and the four side covering films 3 are respectively arranged on both sides of the two large covering films 2. The four side covering films 3 are symmetrically arranged on both sides of the two large covering films 2. The length of the bottom covering film 1 is greater than the length of the large covering film 2. The bottom covering film 1 is folded upward and connected to the side covering films 3, and the two sides of the connection between the bottom covering film 1 and the large covering film 2 are arc angles.

[0022] The arc angle design can avoid the problem of interference between the insulating film and the shell when the battery cell and the aluminum shell are assembled into the shell, thereby improving production efficiency and qualified rate. The bottom support plate 4 is set to be I-shaped. The design of the I-shaped bottom support plate 4 can effectively support the battery cell, making it difficult for the insulating film to deform, while reducing the amount of materials used and reducing the weight of the battery.

[0023] At the same time, the radius of the arc angle and the size of each part of the coating film are limited to solve the problem of interference between the insulating film and the shell while meeting the electrical coating requirements. The radius of the arc angle is r, and Where b is the height of the large coating film 2. And the length of the side coating film 3 is a, and Wherein d is the width of the bottom coating film 1. The length of the bottom support plate 4 is suitable for the length of the large coating film 2 (the length of the large coating film is c), and the width of the bottom support plate 4 is suitable for the width d of the bottom coating film 1.

[0024] The bottom support plate 4 and the bottom coating film 1 are both provided with bonding points 5, and the bottom support plate 4 and the bottom coating film 1 are bonded by hot melt. The thickness of the bottom support plate 4 is 0.3-0.5mm, and the bottom support plate 4 and the bottom coating film 1 are correspondingly provided with positioning holes 6. The positioning holes 6 are used for positioning the insulating film by the battery assembly manufacturing equipment to improve the battery manufacturing qualification rate. The bottom coating film 1 is also provided with a plurality of bottom through holes 7, which help the electrolyte to penetrate the insulating film and infiltrate into the battery cell.

[0025] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A lithium-ion battery core coated with an insulating film, characterized in that: It comprises a bottom covering film, two large covering films, four side covering films and a bottom supporting plate located at the bottom of the bottom covering film; The two large covering films are arranged on both sides of the bottom covering film, the four side covering films are respectively arranged on both sides of the two large covering films, and the four side covering films are symmetrically arranged on both sides of the two large covering films. The length of the bottom covering film is greater than that of the large covering film, the bottom covering film is folded upward and connected to the side covering films, and the two sides of the connection between the bottom covering film and the large covering film are arc angles.

2. The lithium-ion battery core coated insulating film according to claim 1, characterized in that: The radius of the arc angle is r, and Where b is the height of the large bread covering.

3. The lithium-ion battery core coated insulating film according to claim 1, characterized in that: The length of the side covering film is a, and Where d is the width of the bottom coating film.

4. The lithium-ion battery core coated insulating film according to claim 1, characterized in that: The length of the bottom support plate is adapted to the length of the large covering film, and the width of the bottom support plate is adapted to the width of the bottom covering film.

5. The lithium-ion battery core coated insulating film according to claim 1, characterized in that: The bottom support plate and the bottom covering film are both provided with bonding points, and the bottom support plate and the bottom covering film are bonded by hot-melt bonding.

6. The lithium-ion battery core coated insulating film according to claim 1, characterized in that: The bottom support plate is arranged in an I-shape.

7. The lithium-ion battery core coated insulating film according to claim 1, characterized in that: Positioning holes are correspondingly arranged on the bottom supporting plate and the bottom covering film.

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