Explosion-proof valve protection cover

Abstract

The utility model discloses an explosion-proof valve protective cover, which is fixed on a battery cover plate, is positioned above an explosion-proof valve, and comprises an outer cover and an inner cover which are provided with openings at the lower ends and are sleeved with each other, a plurality of first exhaust holes are arranged on the inner cover, the outer cover is used for being fixed on the battery cover plate, a plurality of second exhaust holes are arranged on the outer cover, and the inner cover is provided with a plurality of second exhaust holes. The first exhaust holes and the second exhaust holes are distributed in a crossed mode, the inner cover is made of high-temperature-resistant materials, and an avoiding space is formed between the inner cover and the anti-explosion valve. Therefore, when the battery cell participates in a safety test and is subjected to thermal runaway, due to the arrangement of the anti-explosion valve protection cover structure, sparks generated by the battery cell do not disperse into air through the exhaust holes to cause the battery cell to catch fire, but impact on the high-temperature-resistant inner cover to counteract the energy generated by the high-temperature-resistant inner cover, so that the battery cell does not catch fire.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve protection cover. Background Art

[0002] Since the battery cell contains a large amount of chemical substances, in order to ensure the safety performance of the battery cell, safety tests will be carried out after the battery cell is produced to cause thermal runaway of the battery. At this time, a large amount of mixed gas will be generated inside the battery cell, and pressure will continue to accumulate. If the pressure is not released in time, the battery cell will explode, especially the pre-lithium battery cell, which contains more active lithium and is more prone to fire or explosion. The function of the explosion-proof valve is that when the pressure inside the battery cell is higher than the explosion value set by the explosion-proof valve, the gas inside the battery cell is discharged to the outside through the explosion-proof valve, thereby achieving the balance of air pressure inside and outside the battery cell, and no explosion will occur. However, sometimes sparks will be ejected from the inside of the battery cell, causing the battery cell to catch fire and fail the safety test. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes an explosion-proof valve protection cover.

[0004] The utility model proposes an explosion-proof valve protection cover, which is fixed on a battery cover plate and located above the explosion-proof valve, and comprises an outer cover and an inner cover which are mutually sleeved and have an opening at the lower end, wherein the inner cover is provided with a plurality of first exhaust holes, and the outer cover is used to be fixed on the battery cover plate and is provided with a plurality of second exhaust holes, and the first exhaust holes and the second exhaust holes are cross-distributed, and the inner cover is made of a high temperature resistant material and has an avoidance space between the inner cover and the explosion-proof valve.

[0005] Preferably, the inner cover is made of high temperature resistant stainless steel.

[0006] Preferably, the outer cover is made of aluminum alloy.

[0007] Preferably, the outer cover is welded to the battery cover plate.

[0008] Preferably, a plurality of the first exhaust holes are arranged on the top surface and the side surfaces of the inner cover, and a plurality of the second exhaust holes are arranged on the top surface and the side surfaces of the outer cover.

[0009] Preferably, the first exhaust hole and the second exhaust hole are of arbitrary shapes.

[0010] In summary, the utility model has the following beneficial effects: when a battery cell undergoes thermal runaway during a safety test, due to the explosion-proof valve protective cover structure, the sparks generated by the battery cell will not dissipate into the air through the exhaust holes to cause the battery cell to catch fire, but will hit the high-temperature resistant inner cover, offsetting the energy generated by the sparks and preventing the battery cell from catching fire.

[0011] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an exploded view of the installation of the explosion-proof valve protection cover and the battery cover in the embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of the inner cover structure in the embodiment of the utility model;

[0014] Figure 3 It is a schematic diagram of the outer cover structure in the embodiment of the utility model.

[0015] In the figure:

[0016] 1. Battery cover; 2. Outer cover; 3. Inner cover; 4. First exhaust hole; 5. Second exhaust hole. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] like Figure 1-3 As shown, an explosion-proof valve protection cover proposed in this embodiment is fixed on the battery cover 1 and located above the explosion-proof valve, including an outer cover 2 and an inner cover 3 with an opening at the lower end and arranged on each other, and a plurality of first exhaust holes 4 are provided on the inner cover 3. The outer cover 2 is used to be fixed on the battery cover 1 and is provided with a plurality of second exhaust holes 5, and the first exhaust holes 4 and the second exhaust holes 5 are cross-distributed. The inner cover 3 is made of high temperature resistant material and has an avoidance space between it and the explosion-proof valve.

[0019] In this way, when a battery cell undergoes thermal runaway during a safety test, due to the explosion-proof valve protective cover structure, the sparks generated by the battery cell will not be dissipated into the air through the exhaust holes to cause the battery cell to catch fire, but will hit the high-temperature resistant inner cover 3 to offset the energy generated and will not cause the battery cell to catch fire.

[0020] Furthermore, there is an escape space between the inner cover 3 and the explosion-proof valve to ensure that the explosion-proof valve will not be blocked by the protective cover when it is opened. The inner cover 3 is made of high-temperature resistant stainless steel to prevent the high temperature generated when the battery cell is thermally runaway from melting it.

[0021] At the same time, in order to facilitate the fixing of the explosion-proof valve protection cover and the battery cover plate 1 in this embodiment, the outer cover 2 is set to be made of aluminum alloy. Specifically, the outer cover 2 and the battery cover plate 1 are welded.

[0022] In this embodiment, Figure 2 and Figure 3 As shown, a plurality of first exhaust holes 4 are provided on the top surface and the side surface of the inner cover 3, and a plurality of second exhaust holes 5 are provided on the top surface and the side surface of the outer cover 2. Furthermore, the first exhaust holes 4 and the second exhaust holes 5 are of any shape, specifically, they can be circular, square, etc., depending on the specific situation.

[0023] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. An explosion-proof valve protective cover, fixed on the battery cover and located above the explosion-proof valve, characterized in that: It includes an outer cover and an inner cover with an opening at the lower end, which are arranged on each other. The inner cover is provided with a plurality of first exhaust holes. The outer cover is used to be fixed on the battery cover plate, and is provided with a plurality of second exhaust holes, and the first exhaust holes and the second exhaust holes are cross-distributed. The inner cover is made of high temperature resistant material and has an avoidance space between it and the explosion-proof valve.

2. The explosion-proof valve protection cover according to claim 1, characterized in that: The inner cover is made of high temperature resistant stainless steel.

3. The explosion-proof valve protection cover according to claim 1, characterized in that: The outer cover is made of aluminum alloy.

4. The explosion-proof valve protection cover according to claim 3, characterized in that: The outer cover is welded to the battery cover plate.

5. The explosion-proof valve protection cover according to claim 1, characterized in that: A plurality of the first exhaust holes are arranged on the top surface and the side surface of the inner cover, and a plurality of the second exhaust holes are arranged on the top surface and the side surface of the outer cover.

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