Integrated anti-explosion valve

Abstract

The utility model provides an integrated explosion-proof valve, which relates to the battery technology and comprises an aluminum shell, and a cover plate covers the end part of the aluminum shell; the explosion-proof nick is arranged on the outer wall of the aluminum shell along the circumferential direction of the aluminum shell; the explosion-proof valve has the advantages that the explosion-proof nick and the aluminum shell are of an integrated structure, laser welding is not needed, the closed annular explosion-proof nick is formed in the circumferential direction of the aluminum shell in an integrated forming mode, compared with an explosion-proof valve formed in a welding mode in the prior art, the risk of battery liquid leakage can be reduced, cost is lower, the explosion-proof valve is not affected by welding quality, and the service life of the battery is prolonged. The opening range of the closed ring is larger than that of a traditional nick (multiple small sections), and the risk of thermal runaway of the battery can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an integrated explosion-proof valve. Background Technology

[0002] Currently, square lithium-ion batteries primarily use a serrated surface as an explosion-proof device. When the battery heats up, the internal gas expands, and the pressure increases to a certain level, the serrated surface detaches and ruptures, releasing gas and pressure, thus preventing the battery from exploding. Due to the limitations of aluminum shell forming processes, current aluminum shell explosion-proof valves still rely on laser welding of the valve plate onto the aluminum shell. This structure is complex, costly, and the valve's opening pressure is significantly affected by the heat generated during laser welding. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides an integrated explosion-proof valve, comprising:

[0004] An aluminum shell, the ends of which are covered with a cover plate;

[0005] Explosion-proof grooves are provided on the outer wall of the aluminum shell along the circumference of the aluminum shell.

[0006] Preferably, the cover plate includes a positive electrode cover plate and a negative electrode cover plate, which are respectively installed on both ends of the aluminum shell;

[0007] The explosion-proof markings are located on the aluminum shell near the positive electrode cover plate and / or near the end of the negative electrode cover plate.

[0008] Preferably, the explosion-proof markings are a closed ring structure.

[0009] Preferably, the aluminum shell has a stacked core in the middle, and the explosion-proof groove is located between the positive electrode cover and the edge of the stacked core, and / or between the negative electrode cover and the edge of the stacked core.

[0010] Preferably, the distance between the explosion-proof groove and the positive electrode cover plate, and / or the negative electrode cover plate is 4 to 10 mm.

[0011] Preferably, the depth of the explosion-proof groove is less than the thickness of the aluminum shell.

[0012] Preferably, the depth of the explosion-proof groove is 0.2 to 0.3 mm.

[0013] Preferably, when there are two explosion-proof markings, the two explosion-proof markings are parallel to each other.

[0014] Preferably, the aluminum shell is square.

[0015] Preferably, when there are two explosion-proof markings, the distance between the two explosion-proof markings is 2-5mm.

[0016] The above technical solution has the following advantages or beneficial effects: the explosion-proof groove and the aluminum shell are an integral structure, which does not require laser welding. Instead, the explosion-proof groove is formed in the circumference of the aluminum shell by integral molding. Compared with the explosion-proof valve formed by welding in the prior art, it can reduce the risk of battery leakage, and the cost is also lower. It is not affected by the welding quality. The closed ring has a larger opening range than the traditional groove (multiple small segments), which can reduce the risk of battery thermal runaway. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an integrated explosion-proof valve in a preferred embodiment of the present invention. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0019] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, an integrated explosion-proof valve is provided, such as... Figure 1 As shown, it includes:

[0020] Aluminum shell 1, with a cover plate 2 covering the end of aluminum shell 1;

[0021] Explosion-proof grooves 3 are provided on the outer wall of aluminum shell 1 along the circumference of aluminum shell 1.

[0022] Furthermore, in this embodiment, the explosion-proof notch 3 is a closed ring structure.

[0023] Specifically, in this embodiment, the explosion-proof groove 3 and the aluminum shell 1 are an integral structure, which does not require laser welding. Instead, other methods are used to form an integral structure, such as integral die casting or turning, to form a closed ring explosion-proof groove 3 in the circumference of the aluminum shell 1. Compared with the explosion-proof valve formed by welding in the prior art, it can reduce the risk of battery leakage, has a lower cost, and is not affected by welding quality. The closed ring structure has a larger opening range than the traditional groove (multiple small segments), which can reduce the risk of battery thermal runaway.

[0024] The preferred embodiment of this utility model is as follows: Figure 1 As shown, the cover plate 2 includes a positive electrode cover plate 21 and a negative electrode cover plate 22, which are respectively installed on both ends of the aluminum shell;

[0025] There are two possibilities for the number of explosion-proof grooves 3: when there is one groove, it is located on the aluminum shell 1 near the positive electrode cover plate 21 or near the negative electrode cover plate 22; when there are two grooves, they are located on the aluminum shell 1 near the positive electrode cover plate 21 and near the negative electrode cover plate 22.

[0026] Furthermore, in this embodiment, the aluminum shell 1 is equipped with a stacked core in the middle, and the explosion-proof groove 3 is located between the positive electrode cover plate 21 and the edge of the stacked core, and / or between the negative electrode cover plate 22 and the edge of the stacked core.

[0027] Furthermore, in this embodiment, the distance between the explosion-proof groove 3 and the positive electrode cover plate 21 and / or the negative electrode cover plate 22 is 4 to 10 mm.

[0028] Specifically, in this embodiment, the aluminum shell 1 surrounds the stacked core. A positive electrode cover plate 21 and a negative electrode cover plate 22 are respectively placed on both ends of the aluminum shell 1 to form a lithium-ion battery. At this time, explosion-proof grooves 3 are set near the positive electrode cover plate 21 / negative electrode cover plate 22, and the distance is 4-10mm. This is to avoid the heat-affected zone of the cover plate laser welding and also to avoid the stacked core to prevent accidents.

[0029] In a preferred embodiment of this utility model, the depth of the explosion-proof groove 3 is less than the thickness of the aluminum shell, and in this embodiment, the depth of the explosion-proof groove 3 is 0.2 to 0.3 mm.

[0030] Specifically, in this embodiment, the depth of the explosion-proof notch 3 is 0.2 to 0.3 mm. This avoids the aluminum shell 1 at the notch being too fragile due to excessive notch depth, and also avoids the notch depth failing to meet the explosion-proof opening requirements, thus ensuring the effectiveness of the explosion.

[0031] The preferred embodiment of this utility model is as follows: Figure 1 As shown, when there are two explosion-proof markings 3, the two explosion-proof markings 3 are parallel to each other.

[0032] Furthermore, in this embodiment, when there are two explosion-proof grooves 3, the distance between the two explosion-proof grooves 3 is 2-5mm.

[0033] Specifically, in this embodiment, the positions of the two explosion-proof grooves 3 on the aluminum shell 1 are symmetrical and parallel to each other about the center of the aluminum shell. The distance between each point on the explosion-proof groove 3 and the center of the aluminum shell is equal, which can ensure that both ends of the aluminum shell 1 have the same explosion-proof effect. The spacing between the explosion-proof grooves 3 also avoids mutual interference between the explosion-proof grooves 3.

[0034] In a preferred embodiment of this utility model, the aluminum shell 1 is square.

[0035] Specifically, in this embodiment, the aluminum shell 1 is square. Compared with a round aluminum shell, a square aluminum shell can have smaller gaps between the shells, which can increase the stacking density of the battery.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. An integrated explosion-proof valve, characterized in that, include: An aluminum shell, the ends of which are covered with a cover plate; Explosion-proof grooves are provided on the outer wall of the aluminum shell along the circumference of the aluminum shell.

2. The integrated explosion-proof valve according to claim 1, characterized in that, The cover plate includes a positive electrode cover plate and a negative electrode cover plate, which are respectively installed on both ends of the aluminum shell; The explosion-proof grooves are located on the aluminum shell near the positive electrode cover plate and / or near the end of the negative electrode cover plate.

3. The integrated explosion-proof valve according to claim 1, characterized in that, The explosion-proof markings are a closed ring structure.

4. The integrated explosion-proof valve according to claim 2, characterized in that, The aluminum shell has a stacked core in the middle, and the explosion-proof groove is located between the positive electrode cover and the edge of the stacked core, and / or between the negative electrode cover and the edge of the stacked core.

5. The integrated explosion-proof valve according to claim 2, characterized in that, The distance between the explosion-proof groove and the positive electrode cover plate, and / or the negative electrode cover plate is 4 to 10 mm.

6. The integrated explosion-proof valve according to claim 1, characterized in that, The depth of the explosion-proof grooves is less than the thickness of the aluminum shell.

7. The integrated explosion-proof valve according to claim 6, characterized in that, The depth of the explosion-proof groove is 0.2 to 0.3 mm.

8. The integrated explosion-proof valve according to claim 2, characterized in that, When there are two explosion-proof markings, the two explosion-proof markings are parallel to each other.

9. The integrated explosion-proof valve according to claim 1, characterized in that, The aluminum shell is square.

10. The integrated explosion-proof valve according to claim 8, characterized in that, When there are two explosion-proof markings, the distance between the two explosion-proof markings is 2-5mm.

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