Anti-explosion sheet structure of battery cover plate

Abstract

The utility model discloses an explosion-proof sheet structure of a battery cover plate, which belongs to the technical field of explosion-proof sheets for battery cover plates, and comprises a body, the body comprises a frame part and a middle part, the middle part is a flat surface, an explosion groove is arranged in the middle part, and the vertical section of the explosion groove is a trapezoidal groove. Compared with an arc-shaped middle part in the prior art, the middle part of the explosion-proof sheet body is provided with the flat surface, the swing amplitude of the flat surface is smaller when the middle part of the flat surface is subjected to different internal and external pressures of a battery, so that the amplitude of repeated internal and external swing at the explosion groove is reduced, the fatigue failure of the explosion groove is avoided, and the service life of the explosion-proof sheet is prolonged. And the service life of the anti-explosion sheet is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion-proof sheets for battery cover plates, and in particular relates to an explosion-proof sheet structure for a battery cover plate. Background Art

[0002] The explosion-proof piece can be called a power explosion-proof valve, also known as a power battery explosion-proof valve or a power battery cap, and is a key component in a lithium-ion power battery. It can ventilate quickly during normal operation; when the gas reaches the critical value of the explosion-proof point, it is instantly connected to the outside, a large amount of gas is discharged, and the strong pressure inside the cavity is quickly released to avoid explosion or reduce explosion. At present, the existing explosion-proof piece includes a frame part, a middle part, and a bursting groove arranged inside the middle part. However, since the middle part will be subjected to force during the process of forming the bursting groove, after the bursting groove is formed, the middle part will be formed into an arc shape. Due to the existence of the arc shape, when the pressure outside and inside the battery are different, the arc-shaped middle part will repeatedly swing in the inner and outer directions. Due to the swing of the arc-shaped middle part, the bursting groove is fatigued, resulting in the bursting groove breaking and failure. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a battery cover explosion-proof plate structure, which can avoid the amplitude of repeated inward and outward swinging of the middle part, thereby reducing the fatigue at the explosion groove, avoiding failure of the explosion groove, extending the service life of the explosion-proof plate, and solving the problems in the above-mentioned background technology.

[0004] The purpose of the utility model is achieved as follows: a battery cover explosion-proof plate structure, which includes a body, the body includes a frame portion and a middle portion, the middle portion is a flat surface, a blasting groove is arranged inside the middle portion, and the vertical section of the blasting groove is a trapezoidal groove.

[0005] Furthermore, the body is elliptical.

[0006] Furthermore, the frame portion and the middle portion are integrally formed.

[0007] Furthermore, the middle portion and the frame portion are formed by extruding the upper surface of the body from top to bottom through a mold.

[0008] Furthermore, a protrusion is provided at the lower end of the mold.

[0009] Furthermore, the blasting groove is formed by pressing the protruding portion onto the upper surface of the middle portion.

[0010] Furthermore, the middle portion is elliptical.

[0011] Furthermore, the blasting groove is an elliptical annular groove.

[0012] The beneficial effects of the utility model are as follows: by setting the middle part of the explosion-proof plate body as a flat surface, compared with the arc-shaped middle part in the prior art, the middle part of the flat surface has a smaller swing amplitude when subjected to different internal and external pressures of the battery, thereby reducing the amplitude of repeated internal and external swings at the blasting groove, thereby avoiding fatigue failure of the blasting groove and extending the service life of the explosion-proof plate. The arc-shaped middle part in the prior art will swing in and out repeatedly about 12-15 times, and fatigue fracture will occur at the blasting groove; while the improved flat surface middle part can swing in and out repeatedly about 30 times, and fatigue fracture will occur at the blasting groove. The current standard is that the middle part of the explosion-proof plate is qualified only if it swings in and out repeatedly more than 10 times. After the improvement of the prior art products, the utility model far exceeds the standard and achieves three times the effect of the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the explosion-proof disk in the prior art;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the explosion-proof disk in the prior art;

[0015] Figure 3 yes Figure 2 Middle A: Enlarged view;

[0016] Figure 4 It is a schematic diagram of the explosion-proof disk structure of the utility model;

[0017] Figure 5 It is a schematic diagram of the cross-sectional structure of the explosion-proof disk of the utility model;

[0018] Figure 6 yes Figure 5 Middle B is an enlarged view.

[0019] In the figure: 1, main body 2, frame part 3, middle part 4, blasting groove. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the present invention in conjunction with the accompanying drawings. It should be noted that all directional words such as up, down, front, back, left, and right that appear in the present invention are based on Figure 1 The directional words are made for reference figures, and all directional words do not limit the utility model, but are only for more clear description and explanation of the utility model. Example

[0021] like Figure 4-6 As shown, this embodiment discloses a battery cover explosion-proof plate structure, which includes a main body 1, wherein the main body 1 includes a frame portion 2 and a middle portion 3, wherein the middle portion 3 is a flat surface, and a blasting groove 4 is arranged inside the middle portion 3, and the vertical section of the blasting groove 4 is a trapezoidal groove.

[0022] This embodiment sets the middle part 3 of the explosion-proof plate body 1 as a flat surface. Compared with the arc-shaped middle part 3 in the prior art, the flat surface of the middle part 3 is less likely to swing when subjected to different pressures inside and outside the battery, thereby reducing the amplitude of repeated inward and outward swings at the blasting groove 4, thereby avoiding fatigue failure of the blasting groove 4 and extending the service life of the explosion-proof plate. The arc-shaped middle part 3 in the prior art swings inward and outward about 12-15 times, and fatigue fracture will occur at the blasting groove 4; while the improved flat surface middle part 3 can swing inward and outward about 30 times, and fatigue fracture will occur at the blasting groove 4. The current standard is that the middle part 3 of the explosion-proof plate is qualified only if it swings inward and outward more than 10 times. After the improvement of the prior art products, the utility model far exceeds the standard and achieves three times the effect of the standard. Example

[0023] like Figure 4-6 As shown, this embodiment discloses a battery cover explosion-proof plate structure, which includes a main body 1, wherein the main body 1 includes a frame portion 2 and a middle portion 3, wherein the middle portion 3 is a flat surface, and a blasting groove 4 is arranged inside the middle portion 3, and the vertical section of the blasting groove 4 is a trapezoidal groove.

[0024] For better effect, the body 1 is oval.

[0025] For better effect, the frame portion 2 and the middle portion 3 are integrally formed.

[0026] For better effect, the middle portion 3 is oval.

[0027] This embodiment sets the middle part 3 of the explosion-proof plate body 1 as a flat surface. Compared with the arc-shaped middle part 3 in the prior art, the flat surface of the middle part 3 is less likely to swing when subjected to different pressures inside and outside the battery, thereby reducing the amplitude of repeated inward and outward swings at the blasting groove 4, thereby avoiding fatigue failure of the blasting groove 4 and extending the service life of the explosion-proof plate. The arc-shaped middle part 3 in the prior art swings inward and outward about 12-15 times, and fatigue fracture will occur at the blasting groove 4; while the improved flat surface middle part 3 can swing inward and outward about 30 times, and fatigue fracture will occur at the blasting groove 4. The current standard is that the middle part 3 of the explosion-proof plate is qualified only if it swings inward and outward more than 10 times. After the improvement of the prior art products, the utility model far exceeds the standard and achieves three times the effect of the standard. Example

[0028] like Figure 4-6As shown, this embodiment discloses a battery cover explosion-proof plate structure, which includes a body 1, the body 1 includes a frame portion 2 and a middle portion 3, the middle portion 3 is a flat surface, and a bursting groove 4 is arranged inside the middle portion 3, and the vertical section of the bursting groove 4 is a trapezoidal groove. The body 1 is elliptical, the frame portion 2 and the middle portion 3 are integrally formed, the middle portion 3 is elliptical, and the bursting groove 4 is an elliptical annular groove.

[0029] In order to achieve better effect, the upper surface of the main body 1 is extruded from top to bottom by a mold to form the middle part 3 and the frame part 2.

[0030] In order to achieve better effect, a protrusion is provided at the lower end of the mold.

[0031] In order to achieve a better effect, the blasting groove 4 is formed by pressing the protrusion onto the upper surface of the middle part 3 .

[0032] This embodiment sets the middle part 3 of the explosion-proof plate body 1 as a flat surface. Compared with the arc-shaped middle part 3 in the prior art, the flat surface of the middle part 3 is less likely to swing when subjected to different pressures inside and outside the battery, thereby reducing the amplitude of repeated inward and outward swings at the blasting groove 4, thereby avoiding fatigue failure of the blasting groove 4 and extending the service life of the explosion-proof plate. The arc-shaped middle part 3 in the prior art swings inward and outward about 12-15 times, and fatigue fracture will occur at the blasting groove 4; while the improved flat surface middle part 3 can swing inward and outward about 30 times, and fatigue fracture will occur at the blasting groove 4. The current standard is that the middle part 3 of the explosion-proof plate is qualified only if it swings inward and outward more than 10 times. After the improvement of the prior art products, the utility model far exceeds the standard and achieves three times the effect of the standard.

[0033] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery cover explosion-proof plate structure, comprising a body, wherein the body comprises a frame portion and a middle portion, characterized in that: The middle part is a flat surface, and a blasting groove is arranged inside the middle part, and the vertical section of the blasting groove is a trapezoidal groove.

2. The battery cover explosion-proof plate structure according to claim 1, characterized in that: The body is oval.

3. The battery cover explosion-proof plate structure according to claim 1, characterized in that: The frame portion and the middle portion are integrally formed.

4. The battery cover explosion-proof plate structure according to claim 1, characterized in that: The middle portion is oval in shape.

5. The battery cover explosion-proof plate structure according to claim 1, characterized in that: The blasting groove is an elliptical annular groove.

Images