Explosion-proof valve and battery cover plate

Abstract

This utility model discloses an explosion-proof valve and a cell cover plate, relating to the field of new energy battery technology. Specifically, this application includes an explosion-proof bracket and an explosion-proof plate. The explosion-proof bracket has a pressure relief hole that penetrates the bracket. The explosion-proof plate is located at the top of the explosion-proof bracket, sealing the pressure relief hole. The cross-sectional area of ​​the explosion-proof plate is larger than that of the pressure relief hole. The edge of the explosion-proof plate extending beyond the pressure relief hole is fixedly connected to the explosion-proof bracket. This utility model adopts a non-marking design. Pressure within the battery casing acts on the explosion-proof plate, causing its edge to detach from the explosion-proof bracket, opening the pressure relief hole and releasing pressure from the battery casing. This ensures the pressure relief function of the explosion-proof valve, thereby guaranteeing the safety performance of the new energy battery. It also prevents the explosion-proof valve from easily deforming under stress due to markings, which could lead to unstable opening pressure, thus ensuring the normal use of the new energy battery.

Description

Technical Field

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

[0002] With rapid economic development, my country's energy demand has increased significantly. At the same time, people's awareness of environmental protection and energy conservation has also been continuously strengthened. In order to improve environmental problems and promote sustainable economic development, new energy batteries have become a major research hotspot. Among them, the safety performance of new energy batteries is the top priority of research.

[0003] New energy batteries are usually equipped with explosion-proof valves. The main function of the explosion-proof valve is to release pressure and gas. When a new energy battery experiences thermal runaway due to mechanical impact, abnormal internal connection, short circuit, or other reasons, the high-temperature and high-pressure gas inside can be released in a directional manner through the explosion-proof valve, thereby ensuring the safety performance of the new energy battery.

[0004] The reason why the explosion-proof valves of existing new energy batteries can promptly release high-temperature, high-pressure gases inside the battery in the event of thermal runaway is because they have groove-shaped grooves. Since the structural strength at the grooved area is lower than that of other areas of the explosion-proof valve, the valve can break at the grooved area to release the high-temperature, high-pressure gases inside the battery when thermal runaway occurs.

[0005] However, precisely because the structural strength at the etched area is less than that of other areas of the explosion-proof valve, the explosion-proof valve of existing new energy batteries is prone to deformation under stress during transportation or transfer, causing it to open prematurely or break abnormally. This affects both the safety performance and normal use of the new energy battery. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of the prior art by providing an explosion-proof valve and a cell cover plate. The non-marking design ensures the pressure relief function of the explosion-proof valve, thereby guaranteeing the safety performance of the new energy battery. It also prevents the explosion-proof valve from being easily deformed by stress due to markings, which could lead to unstable valve opening pressure and thus ensure the normal use of the new energy battery.

[0007] This utility model proposes an explosion-proof valve, including an explosion-proof bracket and an explosion-proof plate. The explosion-proof bracket has a pressure relief hole that penetrates through the explosion-proof bracket. The explosion-proof plate is located at the top of the explosion-proof bracket and seals the pressure relief hole. The cross-sectional area of ​​the explosion-proof plate is larger than the cross-sectional area of ​​the pressure relief hole. The edge region of the explosion-proof plate extending beyond the area of ​​the pressure relief hole is fixedly connected to the explosion-proof bracket, so that when the pressure inside the battery casing reaches the explosion-proof pressure of the battery, the edge region of the explosion-proof plate will detach from the explosion-proof bracket.

[0008] Furthermore, the edge area of ​​the explosion-proof sheet extending beyond the range of the pressure relief hole is fixedly connected to the top of the explosion-proof bracket using a hot-melt process.

[0009] Furthermore, the explosion-proof bracket has a first mounting groove at its top, the top of the first mounting groove is open, and the cross-sectional area is larger than the cross-sectional area of ​​the pressure relief hole, and the explosion-proof sheet is disposed in the first mounting groove.

[0010] Furthermore, the outer peripheral surface of the explosion-proof sheet is fixedly connected to the side wall of the first mounting groove, and the bottom edge of the explosion-proof sheet extending beyond the range of the pressure relief hole is fixedly connected to the bottom wall of the first mounting groove.

[0011] Furthermore, the explosion-proof sheet includes an inner hot-melt layer, an outer protective layer, and a reinforcing layer disposed between the hot-melt layer and the protective layer. The hot-melt layer is used to be fixedly connected to the explosion-proof bracket, the reinforcing layer is used to strengthen the structural strength of the explosion-proof sheet, and the protective layer is used to protect the hot-melt layer and the reinforcing layer.

[0012] Furthermore, the top of the hot-melt layer is provided with a second mounting groove, the top of the second mounting groove is open, the reinforcing layer is disposed in the second mounting groove, and the protective layer closes the top opening of the second mounting groove.

[0013] Furthermore, the thickness of the explosion-proof sheet is 140μm to 160μm.

[0014] This utility model also proposes an explosion-proof valve and a battery cell cover plate, including the above-mentioned explosion-proof valve, and also including a cover plate body, the cover plate body is provided with an explosion-proof opening, the explosion-proof bracket is disposed in the explosion-proof opening, and the pressure relief hole is coaxial with the explosion-proof opening.

[0015] Furthermore, the explosion-proof bracket is formed inside the explosion-proof opening using an injection molding process, forming an integral structure with the cover plate body.

[0016] Furthermore, the outer wall of the explosion-proof bracket is provided with a groove, and the inner wall of the explosion-proof opening is provided with a protrusion that engages with the groove.

[0017] The explosion-proof valve and battery cell cover plate proposed in this utility model have the following beneficial effects:

[0018] (1) This explosion-proof valve adopts a non-marking design. The pressure inside the battery housing acts on the explosion-proof plate, causing the edge area of ​​the explosion-proof plate to separate from the explosion-proof bracket, opening the pressure relief hole, and realizing the pressure relief of the battery housing. This can ensure the pressure relief function of the explosion-proof valve, thereby ensuring the safety performance of the new energy battery, and also prevent the explosion-proof valve from being easily deformed by force due to marking, resulting in unstable valve opening pressure, thereby ensuring the normal use of the new energy battery.

[0019] (2) The edge area of ​​the explosion-proof plate of this explosion-proof valve that extends beyond the range of the pressure relief hole can be fixedly connected to the top of the explosion-proof bracket by heat fusion process, that is, the edge area of ​​the explosion-proof plate and the top of the explosion-proof bracket are heat-fused together, thereby realizing the fixed connection between the edge area of ​​the explosion-proof plate and the explosion-proof bracket.

[0020] (3) The explosion-proof valve has a first mounting groove at the top of the explosion-proof bracket. The top of the first mounting groove is open and the cross-sectional area is larger than the cross-sectional area of ​​the pressure relief hole. The explosion-proof plate is set in the first mounting groove. The explosion-proof plate is limited by the first mounting groove, which makes the manufacturing of the explosion-proof valve simple and convenient and easy to implement. It also makes the edge area of ​​the explosion-proof plate more stable in the heat-fusion connection with the explosion-proof bracket, thereby ensuring the normal use of the new energy battery.

[0021] (4) The explosion-proof valve includes an inner hot melt layer, an outer protective layer, and a reinforcing layer between the hot melt layer and the protective layer. The hot melt layer is used to heat melt and connect with the explosion-proof bracket. The reinforcing layer is used to strengthen the overall structural strength of the explosion-proof valve. The protective layer is used to protect the hot melt layer and the reinforcing layer, thereby further ensuring the normal use of the new energy battery.

[0022] (5) The explosion-proof valve has a second mounting groove on the top of the hot melt layer. The reinforcing layer is set in the second mounting groove, which not only enhances the overall structural strength of the explosion-proof sheet, but also makes the outer peripheral surface and bottom surface of the explosion-proof sheet both hot melt layers, thereby making the edge area of ​​the explosion-proof sheet more stable in hot melt connection with the explosion-proof bracket, and further ensuring the normal use of new energy batteries.

[0023] (6) The outer wall of the explosion-proof bracket of this cell cover is provided with a groove, and the inner wall of the explosion-proof opening is provided with a protrusion. The protrusion and the groove are interlocked, which makes it easier to realize the injection molding of the explosion-proof bracket in the explosion-proof opening and enhances the stability of the explosion-proof bracket on the cover body. This prevents the explosion-proof valve from falling off during transportation or use, and enhances the structural strength of the cell cover, further ensuring the safety performance of the new energy battery and the normal use of the new energy battery. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements.

[0025] Figure 1 This is a schematic diagram of the structure of an explosion-proof valve according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the structure of an explosion-proof support for an explosion-proof valve according to an embodiment of the present utility model;

[0027] Figure 3 This is a cross-sectional schematic diagram of the explosion-proof plate of an explosion-proof valve according to an embodiment of the present utility model;

[0028] Figure 4 This is an exploded view of a battery cell cover plate at an explosion-proof valve according to an embodiment of this utility model;

[0029] Figure 5 This is a cross-sectional schematic diagram of a battery cell cover plate at an explosion-proof valve according to an embodiment of the present invention;

[0030] Figure 6 for Figure 4 Enlarged diagram of point A in the middle.

[0031] In the figure: 1. Explosion-proof bracket; 11. Pressure relief hole; 12. First mounting groove; 13. Groove; 2. Explosion-proof sheet; 21. Hot melt layer; 22. Protective layer; 23. Reinforcing layer; 3. Cover plate body; 31. Explosion-proof opening; 32. Protrusion. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] Please see Figures 1-6 An explosion-proof valve according to an embodiment of the present invention includes an explosion-proof bracket 1 and an explosion-proof plate 2. The explosion-proof bracket 1 is provided with a pressure relief hole 11, which penetrates the explosion-proof bracket 1. The explosion-proof plate 2 is located at the top of the explosion-proof bracket 1 and seals the pressure relief hole 11. The cross-sectional area of ​​the explosion-proof plate 2 is larger than the cross-sectional area of ​​the pressure relief hole 11. The edge of the explosion-proof plate 2 that extends beyond the area of ​​the pressure relief hole 11 is fixedly connected to the explosion-proof bracket 1, so that when the pressure inside the battery casing reaches the explosion-proof pressure, the edge of the explosion-proof plate 2 is detached from the explosion-proof bracket 1.

[0034] In this application, the explosion-proof valve includes an explosion-proof bracket 1 and an explosion-proof disc 2. A pressure relief hole 11 is provided within the explosion-proof bracket 1, and the pressure relief hole 11 penetrates the explosion-proof bracket 1. The explosion-proof disc 2 is disposed at the top of the explosion-proof bracket 1, thereby sealing the pressure relief hole 11. Because the cross-sectional area of ​​the explosion-proof disc 2 is larger than the cross-sectional area of ​​the pressure relief hole 11, when the explosion-proof disc 2 seals the pressure relief hole 11, the central region of the explosion-proof disc 2 coincides with the pressure relief hole 11 in projection, while the edge region of the explosion-proof disc 2 extends beyond the area of ​​the pressure relief hole 11.

[0035] In this application, the edge region of the explosion-proof sheet 2 is fixedly connected to the explosion-proof bracket 1, thereby fixing the explosion-proof sheet 2 on the explosion-proof bracket 1. When the pressure inside the battery casing reaches the explosion-proof pressure of the battery, the pressure inside the battery casing acts on the explosion-proof sheet 2 through the pressure relief hole 11, causing the edge region of the explosion-proof sheet 2 to detach from the explosion-proof bracket 1, thereby opening the pressure relief hole 11 and allowing the high-temperature and high-pressure gas inside the battery casing to be released to the outside of the battery casing through the pressure relief hole 11.

[0036] Because the explosion-proof valve in this application does not involve setting grooves on the explosion-proof plate 2 so that the explosion-proof plate 2 breaks from the grooves under the pressure inside the battery casing, thereby relieving the pressure on the battery casing, but rather the pressure inside the battery casing acts on the explosion-proof plate 2, causing the edge area of ​​the explosion-proof plate 2 to detach from the explosion-proof bracket 1, opening the pressure relief hole 11, thereby relieving the pressure on the battery casing.

[0037] Therefore, the explosion-proof valve of this application adopts a non-marking design, which can not only ensure the pressure relief function of the explosion-proof valve, thereby ensuring the safety performance of the new energy battery, but also prevent the explosion-proof valve from being easily deformed by force due to marking, resulting in unstable valve opening pressure, thereby ensuring the normal use of the new energy battery.

[0038] Specifically, in this embodiment, the edge area of ​​the explosion-proof sheet 2 that extends beyond the range of the pressure relief hole 11 can be fixedly connected to the top of the explosion-proof bracket 1 using a hot-melt process. That is, the edge area of ​​the explosion-proof sheet 2 that extends beyond the range of the pressure relief hole 11 is hot-melted together with the top of the explosion-proof bracket 1, thereby achieving a fixed connection between the edge area of ​​the explosion-proof sheet 2 and the explosion-proof bracket 1.

[0039] When the pressure inside the battery casing reaches the thermal fusion tensile limit between the edge area of ​​the explosion-proof plate 2 and the explosion-proof bracket 1, the pressure inside the battery casing causes the edge area of ​​the explosion-proof plate 2 to detach from the explosion-proof bracket 1, thereby opening the pressure relief hole 11. This allows the high-temperature, high-pressure gas inside the battery casing to be released to the outside of the battery casing through the pressure relief hole 11, thus ensuring the safety performance of the new energy battery. At this time, the thermal fusion tensile limit between the edge area of ​​the explosion-proof plate 2 and the explosion-proof bracket 1 is the explosion-proof pressure of the battery.

[0040] It is foreseeable that in this application, the material of the edge area of ​​the explosion-proof plate 2 that extends beyond the pressure relief hole 11, and the material of the explosion-proof bracket 1, are both plastic materials that can be heat-fused, such as polypropylene (PP) plastic.

[0041] In this embodiment, a first mounting groove 12 is provided on the top of the explosion-proof bracket 1. The top of the first mounting groove 12 is open, and its cross-sectional area is larger than that of the pressure relief hole 11. The explosion-proof plate 2 is disposed in the first mounting groove 12. The first mounting groove 12 limits the position of the explosion-proof plate 2, which guides the placement of the explosion-proof plate 2 on the top of the explosion-proof bracket 1, thereby making the manufacture of this explosion-proof valve simple, convenient, and easy to implement.

[0042] On the other hand, it can increase the contact area between the edge area of ​​the explosion-proof sheet 2 and the top of the explosion-proof bracket 1, thereby making the stability of the heat fusion connection between the edge area of ​​the explosion-proof sheet 2 and the explosion-proof bracket 1 stronger, so as to ensure that the heat fusion tensile limit between the edge area of ​​the explosion-proof sheet 2 and the explosion-proof bracket 1 can reach the preset battery explosion-proof pressure, thereby ensuring the normal use of new energy batteries.

[0043] Specifically, in this embodiment, when the edge area of ​​the explosion-proof sheet 2 is heat-fused to the top of the explosion-proof bracket 1, the outer peripheral surface of the explosion-proof sheet 2 is heat-fused to the side wall of the first mounting groove 12. At the same time, the bottom edge area of ​​the explosion-proof sheet 2 that extends beyond the pressure relief hole 11 is heat-fused to the bottom wall of the first mounting groove 12. This makes the heat-fused connection between the edge of the explosion-proof sheet 2 and the explosion-proof bracket 1 more stable, so as to ensure that the heat-fused tensile strength limit between the edge of the explosion-proof sheet 2 and the explosion-proof bracket 1 can reach the preset battery explosion-proof pressure, thereby ensuring the normal use of the new energy battery.

[0044] In this embodiment, the explosion-proof plate 2 includes an inner heat-fusion layer 21, an outer protective layer 22, and a reinforcing layer 23 disposed between the heat-fusion layer 21 and the protective layer 22. When the explosion-proof plate 2 is placed in the first mounting groove 12, it is heat-fused to the explosion-proof bracket 1 through the heat-fusion layer 21, thereby achieving a fixed connection between the edge area of ​​the explosion-proof plate 2 and the explosion-proof bracket 1.

[0045] By strengthening the overall structural strength of the explosion-proof sheet 2 through the reinforcing layer 23, the explosion-proof valve is further protected from deformation caused by stress during transportation or transfer, which could lead to unstable valve opening pressure and thus further ensure the normal use of the new energy battery.

[0046] The protective layer 22 covers the hot melt layer 21 and the protective layer 22, thereby buffering the impact of external objects during the transportation or use of the explosion-proof valve, and protecting the hot melt layer 21 and the reinforcing layer 23. This prevents the explosion-proof sheet 2 from deforming under stress, which could lead to unstable valve opening pressure and further ensure the normal use of the new energy battery.

[0047] It is foreseeable that: since the explosion-proof sheet 2 is heat-fused to the explosion-proof bracket 1 via the heat-fusion layer 21, the heat-fusion layer 21 and the explosion-proof bracket 1 are made of the same material, both being heat-fused plastic materials, such as polypropylene (PP) plastic. The reinforcing layer 23 is used to strengthen the overall structural strength of the explosion-proof sheet 2, therefore the reinforcing layer 23 can be made of metal, such as aluminum; the protective layer 22 is used to buffer against collisions with external objects, therefore the protective layer 22 can be made of a material with a certain degree of elastic deformation capability, for example, the protective layer 22 can be a thin film made of nylon material.

[0048] Furthermore, in this embodiment, a second mounting groove is provided on the top of the hot-melt layer 21, the top of the second mounting groove is open, the reinforcing layer 23 is disposed in the second mounting groove, and the protective layer 22 closes the top opening of the second mounting groove. In this application, the second mounting groove is provided on the top of the hot-melt layer 21, and the reinforcing layer 23 is disposed in the second mounting groove. This is to enhance the overall structural strength of the explosion-proof sheet 2, thereby ensuring the safety performance of the new energy battery and ensuring its normal use.

[0049] On the other hand, as mentioned in the previous embodiments: when the explosion-proof plate 2 is placed in the first mounting groove 12, the outer peripheral surface of the explosion-proof plate 2 is thermally fused to the side wall of the first mounting groove 12, and at the same time, the bottom edge area of ​​the explosion-proof plate 2 that extends beyond the range of the pressure relief hole 11 is thermally fused to the bottom wall of the first mounting groove 12.

[0050] Therefore, a second mounting groove is provided on the top of the hot-melt layer 21, and the reinforcing layer 23 is placed in the second mounting groove so that the outer peripheral surface and the bottom surface of the explosion-proof sheet 2 are both hot-melt layers 21, so that the hot-melt layer 21 is hot-melted to the explosion-proof bracket 1, thereby realizing the fixed connection between the edge area of ​​the explosion-proof sheet 2 and the explosion-proof bracket 1.

[0051] The top opening of the second mounting groove is sealed by the protective layer 22, which covers the hot melt layer 21 and the protective layer 22. During the transportation or use of the explosion-proof valve, the protective layer 22 buffers the impact of external objects, thereby protecting the hot melt layer 21 and the reinforcing layer 23. This prevents the explosion-proof sheet 2 from deforming under stress, which could lead to unstable valve opening pressure and further ensure the normal use of the new energy battery.

[0052] Furthermore, in this embodiment, the thickness of the explosion-proof sheet 2 is set between 140μm and 160μm. If the thickness of the explosion-proof sheet 2 is too large, the heat-fusion tensile limit between the edge area of ​​the explosion-proof sheet 2 and the explosion-proof bracket 1 will exceed the preset battery explosion-proof pressure, thereby preventing the explosion-proof valve from playing its explosion-proof role and affecting the safety performance of the new energy battery.

[0053] If the thickness of the explosion-proof sheet 2 is too small, it will affect the structural strength of the explosion-proof sheet 2, causing the explosion-proof sheet 2 to easily deform during the transfer of the explosion-proof valve, resulting in unstable valve opening pressure. It will also reduce the heat-fusion tensile strength limit between the edge area of ​​the explosion-proof sheet 2 and the explosion-proof bracket 1, causing the explosion-proof valve to open prematurely, thus affecting the normal use of the new energy battery.

[0054] Therefore, in this application, the thickness of the explosion-proof sheet 2 is set between 140μm and 160μm to prevent the thickness of the explosion-proof sheet 2 from being too large or too small, thereby ensuring the safety performance of the new energy battery and its normal use. In practical implementation, it is preferred that the thickness of the explosion-proof sheet 2 be 153μm.

[0055] This utility model embodiment also provides a battery cell cover plate, including the aforementioned explosion-proof valve and a cover plate body 3. An explosion-proof opening 31 is provided on the cover plate body 3, and the explosion-proof support 1 of the explosion-proof valve is disposed in the explosion-proof opening 31, with the pressure relief hole 11 on the explosion-proof support 1 coaxial with the explosion-proof opening 31. Thus, when the cover plate body 3 seals the battery casing, the pressure inside the battery casing acts on the explosion-proof plate 2 through the pressure relief hole 11. When the pressure inside the battery casing reaches the battery's explosion-proof pressure, the edge area of ​​the explosion-proof plate 2 disengages from the explosion-proof support 1, opening the pressure relief hole 11, allowing the high-temperature, high-pressure gas inside the battery casing to be released to the outside of the battery casing through the pressure relief hole 11.

[0056] Furthermore, in this embodiment, the explosion-proof bracket 1 is injection molded inside the explosion-proof opening 31, forming an integral structure with the cover plate body 3. That is, the explosion-proof bracket 1 is set inside the explosion-proof opening 31 by injection molding, thereby forming an integral structure with the cover plate body 3. This enhances the stability of the explosion-proof valve installed on the cover plate body 3, prevents the explosion-proof valve from falling off during transportation or use, further ensures the safety performance of the new energy battery, and ensures the normal use of the new energy battery.

[0057] As mentioned in the previous embodiments, the explosion-proof bracket 1 is made of plastic material. Therefore, in this application, the explosion-proof bracket 1 can be molded into the explosion-proof opening 31 using an injection molding process.

[0058] Furthermore, in this embodiment, the outer wall of the explosion-proof bracket 1 is provided with a groove 13, and the inner wall of the explosion-proof opening 31 is provided with a protrusion 32. By interlocking the protrusion 32 with the groove 13, it is easier to achieve injection molding of the explosion-proof bracket 1 in the explosion-proof opening 31, thereby making the assembly of this battery cell cover simple, convenient and easy to implement.

[0059] On the other hand, it can enhance the stability of the explosion-proof bracket 1 installed on the cover plate body 3, as well as the overall structural strength of the explosion-proof bracket 1 and the cover plate body 3. This not only prevents the explosion-proof valve from falling off during transportation or use, but also enhances the structural strength of the cell cover plate, further ensuring the safety performance of the new energy battery and ensuring its normal use.

[0060] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An explosion-proof valve, characterized in that: The device includes an explosion-proof bracket (1) and an explosion-proof plate (2). The explosion-proof bracket (1) has a pressure relief hole (11) inside, which penetrates the explosion-proof bracket (1). The explosion-proof plate (2) is located on the top of the explosion-proof bracket (1) and seals the pressure relief hole (11). The cross-sectional area of ​​the explosion-proof plate (2) is larger than the cross-sectional area of ​​the pressure relief hole (11). The edge area of ​​the explosion-proof plate (2) beyond the range of the pressure relief hole (11) is fixedly connected to the explosion-proof bracket (1), so that when the pressure inside the battery casing reaches the explosion-proof pressure of the battery, the edge area of ​​the explosion-proof plate (2) is separated from the explosion-proof bracket (1).

2. The explosion-proof valve as described in claim 1, characterized in that: The edge area of ​​the explosion-proof sheet (2) extending beyond the range of the pressure relief hole (11) is fixedly connected to the top of the explosion-proof bracket (1) using a hot-melt process.

3. The explosion-proof valve as described in claim 1, characterized in that: The explosion-proof bracket (1) has a first mounting groove (12) at its top. The top of the first mounting groove (12) is open and its cross-sectional area is larger than that of the pressure relief hole (11). The explosion-proof plate (2) is located in the first mounting groove (12).

4. The explosion-proof valve as described in claim 3, characterized in that: The outer peripheral surface of the explosion-proof plate (2) is fixedly connected to the side wall of the first mounting groove (12), and the bottom edge of the explosion-proof plate (2) extending beyond the range of the pressure relief hole (11) is fixedly connected to the bottom wall of the first mounting groove (12).

5. The explosion-proof valve as described in claim 2, characterized in that: The explosion-proof sheet (2) includes an inner heat-fusion layer (21), an outer protective layer (22), and a reinforcing layer (23) disposed between the heat-fusion layer (21) and the protective layer (22). The heat-fusion layer (21) is used to be fixedly connected to the explosion-proof bracket (1), the reinforcing layer (23) is used to strengthen the structural strength of the explosion-proof sheet (2), and the protective layer (22) is used to protect the heat-fusion layer (21) and the reinforcing layer (23).

6. The explosion-proof valve as described in claim 5, characterized in that: The top of the hot melt layer (21) is provided with a second mounting groove, the top of the second mounting groove is open, the reinforcing layer (23) is provided in the second mounting groove, and the protective layer (22) closes the top opening of the second mounting groove.

7. The explosion-proof valve as described in claim 1, characterized in that: The thickness of the explosion-proof sheet (2) is 140μm to 160μm.

8. A battery cell cover plate, characterized in that, The explosion-proof valve includes any one of claims 1 to 7, and also includes a cover plate body (3), the cover plate body (3) having an explosion-proof opening (31), the explosion-proof bracket (1) being disposed in the explosion-proof opening (31), and the pressure relief hole (11) being coaxial with the explosion-proof opening (31).

9. A cell cover plate as described in claim 8, characterized in that: The explosion-proof bracket (1) is formed in the explosion-proof opening (31) by injection molding process, forming an integral structure with the cover plate body (3).

10. A cell cover plate as described in claim 9, characterized in that: The outer wall of the explosion-proof bracket (1) is provided with a groove (13), and the inner wall of the explosion-proof opening (31) is provided with a protrusion (32) that is inserted into the groove (13).

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