Fireproof cover plate of battery

Abstract

The utility model relates to a battery fireproof cover plate, which belongs to the technical field of battery safety and is used for solving the problem that in the prior art, after an anti-explosion valve is opened, sparks are in contact with gasified electrolyte to possibly generate deflagration and even cause explosion. The battery fireproof cover plate comprises a cover plate shell, an anti-explosion valve assembly and a fireproof unit, the anti-explosion valve assembly is arranged on the cover plate shell, and the fireproof unit is connected with the anti-explosion valve assembly; the fireproof unit comprises a first fireproof assembly and a second fireproof assembly, the first fireproof assembly is connected with the anti-explosion valve assembly, and the second fireproof assembly is connected with the first fireproof assembly. According to the utility model, the possibility of detonation and even explosion caused by contact of sparks released by breakage of the explosion-proof valve assembly and the gasified electrolyte can be reduced, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, in particular to a battery fireproof cover plate. Background Art

[0002] The explosion-proof valve is an important part of the lithium battery safety protection system. Its function is to automatically open and release the internal pressure when the internal pressure of the battery rises abnormally to prevent the battery from exploding, thereby protecting the integrity of the battery structure and the personal safety of the user.

[0003] The explosion-proof valve is usually designed in the cover of the battery. It not only has the function of releasing pressure, but also has the function of a circuit breaker in some designs. When the pressure inside the battery rises to a certain level, the explosion-proof valve will cut off the current circuit. When the pressure rises further, the explosion-proof valve structure will be destroyed, releasing the pressure inside the battery.

[0004] In the existing structure, when the explosion-proof valve is opened, sparks and combustible gases inside the battery are ejected simultaneously. When the ejected sparks are large and come into contact with the vaporized electrolyte, they may ignite the vaporized electrolyte, causing deflagration and even explosion. Utility Model Content

[0005] In view of the above analysis, the utility model aims to provide a battery fireproof cover to solve the problem in the prior art that after the explosion-proof valve is opened, sparks may come into contact with the gasified electrolyte and cause deflagration or even explosion.

[0006] The purpose of this utility model is mainly achieved through the following technical solutions:

[0007] A battery fireproof cover plate, comprising a cover plate housing, an explosion-proof valve assembly and a fireproof unit, wherein the explosion-proof valve assembly is arranged on the cover plate housing, and the fireproof unit is connected to the explosion-proof valve assembly;

[0008] The fire protection unit comprises a first fire protection component and a second fire protection component, wherein the first fire protection component is connected to the explosion-proof valve component, and the second fire protection component is connected to the first fire protection component;

[0009] The first fireproof assembly includes a first fireproof cover and a connecting plate, and the second fireproof assembly includes a second fireproof cover and a second spring. The connecting plate is arranged in the middle of the first fireproof cover, and the bottom of the second fireproof cover is connected to the connecting plate through the second spring.

[0010] Furthermore, the explosion-proof valve assembly includes an explosion-proof disc, an explosion-proof groove and a connecting groove, wherein the connecting groove is arranged on a side wall of the explosion-proof groove, and the connecting groove is used to connect the fire protection unit.

[0011] Furthermore, the first fire protection component also includes a fixing piece, and the fixing piece cooperates with the connecting groove. The fixing piece is inserted into the connecting groove to connect the fire protection unit with the explosion-proof valve component.

[0012] Furthermore, the first fire protection component also includes a first spring, and the fixing member is connected to the first fire protection cover via the first spring.

[0013] Furthermore, the first fireproof assembly also includes a connecting plate, and the first fireproof cover and the second fireproof cover are both mesh structures.

[0014] Furthermore, the second fireproof assembly further includes a safety strip, and the safety strip passes through the mesh of the first fireproof cover and penetrates the first fireproof cover to connect with two side surfaces opposite to the bottom of the second fireproof cover.

[0015] Furthermore, the safety strip fixes the position of the second fire protection component so that the second spring is in a compressed state.

[0016] Furthermore, the mesh aperture of the second fireproof cover is smaller than the mesh aperture of the first fireproof cover.

[0017] Furthermore, a positive pole and a negative pole are arranged on the cover shell.

[0018] Furthermore, the explosion-proof valve assembly is arranged between the positive electrode pole and the negative electrode pole.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] (1) The battery fireproof cover provided by the utility model effectively blocks sparks released by the explosion-proof valve assembly by providing a fireproof unit, thereby preventing sparks released by the rupture of the explosion-proof plate from contacting the gasified electrolyte to cause deflagration or even explosion.

[0021] (2) By providing the first fireproof component and the second fireproof component, the fireproof unit provides double protection against sparks released by the rupture of the explosion-proof plate, further reducing the possibility of sparks coming into contact with the vaporized electrolyte to produce deflagration or even explosion, thereby enhancing the fire filtering performance of the fireproof unit and improving the safety performance of the battery.

[0022] (3) The second fireproof cover is connected to the connecting plate through the second spring. When the battery is in normal use, the second spring is in a compressed state, which effectively reduces the space occupied by the fireproof unit, saves the use space of the cover plate, and effectively avoids the high height of the fireproof unit affecting the normal use of the battery.

[0023] (4) The second fireproof cover can be effectively fixed by setting a safety strip. When the explosion-proof plate ruptures and releases high-temperature gas and sparks, the safety strip can quickly melt, so that the second fireproof cover moves under the action of the second spring, creating a certain distance between the second fireproof cover and the first fireproof cover to form a double-layer fireproof structure, effectively improving the fireproof performance and enhancing the safety and explosion-proofness of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0025] Figure 1 This is a schematic diagram of the overall structure of the battery fireproof cover of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the explosion-proof valve assembly of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the fire protection unit of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the bottom of the first fireproof component of the utility model;

[0029] Figure 5 This is a schematic structural diagram of the second fire protection component of the utility model.

[0030] Reference numerals:

[0031] 1-cover shell; 11-positive pole; 12-negative pole; 2-explosion-proof valve assembly; 21-explosion-proof plate; 22-explosion-proof groove; 23-connecting groove; 3-fireproof unit; 31-first fireproof assembly; 311-fixing piece; 312-first fireproof cover; 313-connecting plate; 314-first spring; 32-second fireproof assembly; 321-second fireproof cover; 322-second spring; 323-safety strip. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0033] A specific embodiment of the utility model discloses a battery fireproof cover plate, such as Figure 1-2As shown, it includes a cover shell 1, an explosion-proof valve assembly 2 and a fireproof unit 3. The explosion-proof valve assembly 2 is arranged on the cover shell 1. The explosion-proof valve assembly 2 can release the internal pressure when the internal pressure of the battery increases abnormally. The fireproof unit 3 is connected to the explosion-proof valve assembly 2. When the explosion-proof valve assembly 2 releases pressure, the fireproof unit 3 can prevent the explosion-proof valve assembly 2 from spraying sparks that come into contact with the vaporized electrolyte to produce deflagration or even cause an explosion.

[0034] The cover housing 1 is provided with a positive pole 11 and a negative pole 12, and the explosion-proof valve assembly 2 is provided between the positive pole 11 and the negative pole 12. Figure 2 As shown, the explosion-proof valve assembly 2 includes an explosion-proof disc 21, an explosion-proof groove 22 and a connecting groove 23. The explosion-proof groove 22 is arranged on the cover plate housing 1, and the explosion-proof disc 21 is arranged on the explosion-proof groove 22. When the internal pressure of the battery is relatively large, the explosion-proof disc 21 will rupture to release the pressure. For example, when the internal pressure of the battery is 0.4-0.8 MPa, the explosion-proof disc 21 ruptures. The connecting groove 23 is arranged on the side wall of the explosion-proof groove 22, and the number of the connecting grooves 23 is multiple, and the connecting groove 23 is used to connect the fire protection unit 3.

[0035] like Figure 3 As shown, the fire protection unit 3 includes a first fire protection component 31 and a second fire protection component 32. The first fire protection component 31 is connected to the explosion-proof valve component 2, and the second fire protection component 32 is connected to the first fire protection component 31. Figure 3-4 As shown, the first fireproof component 31 includes a fixing part 311, a first fireproof cover 312, a connecting plate 313 and a first spring 314. There are multiple fixing parts 311, and the fixing parts 311 cooperate with the connecting groove 23. The fixing parts 311 are inserted into the connecting groove 23 to connect the fireproof unit 3 with the explosion-proof valve assembly 2. The first fireproof cover 312 is a mesh structure, and the mesh is used to allow the gas and smoke released by the rupture of the explosion-proof plate 21 to pass through the first fireproof cover 312. A connecting plate 313 is arranged in the middle of the first fireproof cover 312, and the connecting plate 313 is connected to the second fireproof component 32.

[0036] like Figure 4 As shown, the fixing member 311 is connected to the first fireproof cover 312 through the first spring 314. When the fireproof unit 3 needs to be connected to the explosion-proof valve assembly 2, the side wall of the connecting groove 23 squeezes the fixing member 311, compresses the first spring 314, and the fixing member 311 retracts into the first fireproof cover 312. When the fixing member 311 moves to a position corresponding to the connecting groove 23, the first spring 314 resets and pushes the fixing member 311 into the connecting groove 23, thereby connecting the fireproof unit 3 to the explosion-proof valve assembly 2.

[0037] like Figure 3 and Figure 5As shown, the second fireproof assembly 32 includes a second fireproof cover 321, a second spring 322 and a safety strip 323. The number of the second spring 322 is multiple, the second fireproof cover 321 is a mesh structure, the bottom of the second fireproof cover 321 is connected to the connecting plate 313 through the second spring 322, the number of the safety strip 323 is multiple, and the safety strip 323 passes through the mesh of the first fireproof cover 312 and connects the first fireproof cover 312 and the two opposite sides of the bottom of the second fireproof cover 321, thereby fixing the position of the second fireproof cover 321 and making the second spring 322 in a compressed state. The safety strip 323 is made of a material with a low melting point, and exemplarily, the safety strip 323 is made of an aluminum-antimony alloy.

[0038] Preferably, the mesh aperture of the second fireproof cover 321 is smaller than the mesh aperture of the first fireproof cover 312 .

[0039] When the battery is in a normal state, the safety strip 323 limits the position of the second fireproof cover 321, so that the second spring 322 is in a compressed state, and the second fireproof component 32 covers the first fireproof component 31, thereby saving the use space of the fireproof unit 3 and preventing the height of the fireproof unit 3 from affecting the use effect of the cover; when the battery is working abnormally and the explosion-proof plate 21 ruptures to release sparks and high-temperature gases, the sparks and high-temperature gases cause the safety strip 323 to melt due to high temperature, thereby releasing the restriction on the position of the second fireproof cover 321, and the spring 322 is reset from the compressed state to push the second fireproof cover 321 to move away from the connecting plate 313. The first fireproof cover 312 cooperates with the second fireproof cover 321 to form a double-layer fireproof structure, which performs double fire filtering on the sparks released by the rupture of the explosion-proof plate 21 to prevent the sparks from contacting the gasified electrolyte to produce deflagration or even cause an explosion.

[0040] The battery fireproof cover of the utility model effectively blocks the sparks released by the explosion-proof valve assembly 2 by setting the fireproof unit 3, preventing the sparks released by the rupture of the explosion-proof plate 21 from contacting with the gasified electrolyte to produce deflagration or even cause an explosion; by setting the first fireproof assembly 31 and the second fireproof assembly 32, the fireproof unit 3 provides double protection against the sparks released by the rupture of the explosion-proof plate 21, further reducing the possibility of the sparks contacting with the gasified electrolyte to produce deflagration or even cause an explosion, enhancing the fire filtering performance of the fireproof unit 3, and improving the safety performance of the battery; the second fireproof cover 321 is connected to the connecting plate 313 by the second spring 322, and when the battery is in normal use The second spring 322 is in a compressed state, which effectively reduces the space occupied by the fireproof unit 3, saves the use space of the cover plate, and effectively avoids the high height of the fireproof unit 3 affecting the normal use of the battery; by setting the insurance strip 323, the second fireproof cover 321 can be effectively fixed. When the explosion-proof plate 21 ruptures and releases high-temperature gas and sparks, the insurance strip 323 can be quickly melted, so that the second fireproof cover 321 is at a certain distance from the first fireproof cover 312 under the action of the second spring 322, and together with the first fireproof cover 312, a double-layer fireproof structure is formed, which effectively improves the fireproof performance and enhances the safety and explosion-proof performance of the battery.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A battery fireproof cover, characterized in that: It comprises a cover plate housing (1), an explosion-proof valve assembly (2) and a fire protection unit (3), wherein the explosion-proof valve assembly (2) is arranged on the cover plate housing (1), and the fire protection unit (3) is connected to the explosion-proof valve assembly (2); The fire protection unit (3) comprises a first fire protection component (31) and a second fire protection component (32), wherein the first fire protection component (31) is connected to the explosion-proof valve component (2), and the second fire protection component (32) is connected to the first fire protection component (31); The first fireproof component (31) includes a first fireproof cover (312) and a connecting plate (313), and the second fireproof component (32) includes a second fireproof cover (321) and a second spring (322). The connecting plate (313) is arranged in the middle of the first fireproof cover (312), and the bottom of the second fireproof cover (321) is connected to the connecting plate (313) through the second spring (322).

2. The battery fireproof cover according to claim 1, characterized in that: The explosion-proof valve assembly (2) comprises an explosion-proof disc (21), an explosion-proof groove (22) and a connecting groove (23); the connecting groove (23) is arranged on a side wall of the explosion-proof groove (22); and the connecting groove (23) is used to connect the fire protection unit (3).

3. The battery fireproof cover according to claim 2, characterized in that: The first fire protection component (31) further comprises a fixing member (311), wherein the fixing member (311) cooperates with the connecting groove (23), and the fixing member (311) is inserted into the connecting groove (23) to connect the fire protection unit (3) with the explosion-proof valve component (2).

4. The battery fireproof cover plate according to claim 3, characterized in that: The first fireproof component (31) further comprises a first spring (314), and the fixing member (311) is connected to the first fireproof cover (312) via the first spring (314).

5. The battery fireproof cover according to claim 1, characterized in that: The first fireproof cover (312) and the second fireproof cover (321) are both mesh structures.

6. The battery fireproof cover according to claim 1, characterized in that: The second fireproof component (32) further comprises a safety strip (323), wherein the safety strip (323) passes through the mesh of the first fireproof cover (312) and is connected to two opposite side surfaces of the bottom of the second fireproof cover (321).

7. The battery fireproof cover plate according to claim 6, characterized in that: The safety strip (323) fixes the position of the second fireproof cover (321), so that the second spring (322) is in a compressed state.

8. The battery fireproof cover according to claim 5, characterized in that: The mesh aperture of the second fireproof cover (321) is smaller than the mesh aperture of the first fireproof cover (312).

9. The battery fireproof cover according to any one of claims 1 to 8, characterized in that: A positive pole column (11) and a negative pole column (12) are arranged on the cover plate housing (1).

10. The battery fireproof cover plate according to claim 9, characterized in that: The explosion-proof valve assembly (2) is arranged between the positive electrode pole (11) and the negative electrode pole (12).

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