Explosion-proof breather valve and battery pack

Abstract

The application discloses an explosion-proof breather valve and a battery pack. The explosion-proof breather valve comprises a valve body, a spring sheet film assembly and a pressing ring. The valve body is provided with a through hole, a platform portion in the valve body divides the through hole into a first cavity and a second cavity, and the platform portion is provided with a first through hole. The spring sheet film assembly is arranged in the first cavity and comprises a spring sheet, a waterproof and breathable film and a silica gel film which are sequentially stacked and fixed. The spring sheet is provided with a first gas permeation hole and a second gas permeation hole, the waterproof and breathable film is provided with a third gas permeation hole, and the silica gel film is provided with a fourth gas permeation hole and a fifth gas permeation hole. The first gas permeation hole and the fourth gas permeation hole axially correspond to the first through hole, and the second gas permeation hole, the third gas permeation hole and the fifth gas permeation hole axially correspond. The pressing ring extends into the first cavity and abuts against the spring sheet film assembly, and a second through hole is arranged in the peripheral wall of the pressing ring. The spring sheet film assembly can be deformed under the action of air pressure to make the silica gel film away from the platform portion. The application has the advantages of simple structure, low cost, normal ventilation and high-pressure pressure relief double functions.

Description

Technical Field

[0001] This application relates to the field of explosion-proof valve technology for battery packs, and more particularly to an explosion-proof vent valve and a battery pack. Background Technology

[0002] Explosion-proof vent valves are widely used in the field of battery packs, especially in power battery packs and energy storage battery packs. They are used to release gas in time when the internal air pressure of the battery pack rises abnormally, preventing the battery pack from exploding or bulging due to excessive internal pressure.

[0003] Currently, the pressure relief method of explosion-proof vent valves for battery packs mainly relies on the movement of the valve core. Vent valves using the valve core movement method require precise matching between the valve core and the valve body, and typically require multiple components such as springs and sealing rings. The large number of components and complex assembly process increase manufacturing costs. At the same time, after long-term use, the valve core is prone to failure due to wear or jamming, resulting in poor pressure relief reliability. Summary of the Invention

[0004] The purpose of this application is to provide an explosion-proof vent valve and battery pack to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides an explosion-proof vent valve for use in a battery pack, including a valve body, a spring-loaded diaphragm assembly, and a pressure ring; The valve body is provided with a through hole that runs through the axial direction. A platform portion is provided inside the through hole. The platform portion divides the through hole into a first cavity and a second cavity that are distributed along the axial direction. The platform portion is provided with a plurality of first through holes, which connect the first cavity and the second cavity. The spring sheet membrane assembly is disposed in the first cavity, and includes a spring sheet, a waterproof and breathable membrane and a silicone membrane stacked and fixedly connected in sequence, wherein the silicone membrane abuts against the platform portion; The spring sheet is provided with a plurality of first vent holes and a plurality of second vent holes, the waterproof and breathable membrane is provided with a plurality of third vent holes, and the silicone membrane is provided with a plurality of fourth vent holes and a plurality of fifth vent holes. The first vent holes, the fourth vent holes and the first through hole are axially corresponding to each other, and the second vent holes, the third vent holes and the fifth vent holes are axially corresponding to each other. The pressure ring extends into the first cavity and abuts against the spring sheet diaphragm assembly. The peripheral wall of the pressure ring is provided with a plurality of second through holes, which connect the first cavity to the external environment. The spring-loaded membrane assembly can deform under the pressure inside the battery pack to move the silicone membrane away from the platform portion.

[0006] In one possible implementation, the diameter of the first vent is larger than that of the second vent, and the diameter of the fourth vent is larger than that of the fifth vent.

[0007] In one possible implementation, the diameter of the fourth vent hole is greater than or equal to the diameter of the first through hole.

[0008] In one possible implementation, a plurality of second vent holes on the spring are arranged at intervals along a first cross-shaped trajectory, and the plurality of first vent holes are respectively disposed in the four quadrant regions divided by the first cross-shaped trajectory. The multiple third vent holes on the waterproof and breathable membrane are arranged at intervals along the second cross-shaped trajectory; The plurality of fifth vent holes on the silicone membrane are arranged at intervals along the third cross-shaped trajectory, and the plurality of fourth vent holes are respectively disposed in the four quadrant regions divided by the third cross-shaped trajectory.

[0009] In one possible implementation, the platform portion has a recessed area that is recessed toward the second cavity, and an annular portion is formed around the recessed area. The first through hole is provided in the recessed area, the silicone membrane abuts against the recessed area, and the fourth vent hole is connected to the first through hole one by one. The area on the silicone membrane without the fourth vent hole and the fifth vent hole abuts against the annular portion.

[0010] In one possible implementation, the pressure ring has a hollow tubular structure, and the lower end of the peripheral wall of the pressure ring abuts against the area of ​​the spring piece where the first vent hole and the second vent hole are not provided. The hollow part of the pressure ring forms a cavity that communicates with the first vent hole and the second vent hole, and the second through hole is opened on the peripheral wall of the pressure ring to communicate the cavity with the external environment.

[0011] In one possible implementation, a plurality of second through holes are evenly spaced along the peripheral wall of the pressure ring.

[0012] In one possible implementation, the spring sheet, the waterproof and breathable membrane, and the silicone membrane are fixedly connected as a whole by hot pressing or bonding.

[0013] In one possible implementation, the pressure ring and the first cavity are connected by an interference fit.

[0014] Secondly, this application provides a battery pack including the aforementioned explosion-proof vent valve.

[0015] The technical solutions provided in this application have the following advantages compared with the prior art: The explosion-proof ventilating valve provided in this application embodiment can achieve both normal ventilation and high-pressure relief functions using only a spring-membrane assembly composed of a spring sheet, a waterproof and breathable membrane, and a silicone sheet. It has a simple structure and low cost. Attached Figure Description The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a cross-sectional view of an explosion-proof vent valve during ventilation, provided as an embodiment of this application.

[0019] Figure 2 This is a cross-sectional view of an explosion-proof vent valve during pressure relief, provided as an embodiment of this application.

[0020] Figure 3 An exploded view of the spring sheet membrane assembly provided in the embodiments of this application.

[0021] Figure 4 A cross-sectional view of the valve body provided in an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures: 100. Valve body; 110. Through hole; 111. First cavity; 112. Second cavity; 120. Platform section; 121. First through hole; 122. Recessed area; 123. Annular section; 200, spring-loaded membrane assembly; 210, spring; 211, first vent; 212, second vent; 220, waterproof and breathable membrane; 221, third vent; 230, silicone membrane; 231, fourth vent; 232, fifth vent; 300, pressure ring; 310, cavity; 320, second through hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0025] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0026] like Figure 1 The explosion-proof vent valve provided in this application embodiment is applied to a battery pack and includes a valve body 100, a spring diaphragm assembly 200, and a pressure ring 300.

[0027] The valve body 100 has an axially extending through hole 110, within which a platform portion 120 is provided. The platform portion 120 divides the through hole 110 into a first cavity 111 and a second cavity 112 distributed axially. The first cavity 111 is located above the platform portion 120, and the second cavity 112 is located below the platform portion 120. The platform portion 120 has a plurality of first through holes 121, which connect the first cavity 111 and the second cavity 112.

[0028] The spring sheet membrane assembly 200 is disposed within the first cavity 111, and includes a spring sheet 210, a waterproof and breathable membrane 220, and a silicone membrane 230 that are stacked and fixedly connected in sequence. The silicone membrane 230 abuts against the platform portion 120.

[0029] Specifically, the spring sheet 210 is an elastic metal sheet, such as a stainless steel spring sheet or a copper alloy spring sheet, with elastic deformation capability. The waterproof and breathable membrane 220 is an expanded polytetrafluoroethylene (ePTFE) waterproof and breathable membrane, which allows gas to pass through while blocking liquids and particles. The silicone membrane 230 is made of silicone rubber, which has good elasticity and sealing performance. The spring sheet 210, the waterproof and breathable membrane 220, and the silicone membrane 230 are fixedly connected as a whole by heat pressing or bonding to form the spring sheet membrane assembly 200. By fixing the three layers together as a whole assembly, the layers will not separate or misalign after long-term use or multiple pressure relief operations, ensuring that the vent holes always correspond, thus improving the air permeability and pressure relief reliability of the valve body.

[0030] The spring sheet 210 has multiple first vent holes 211 and multiple second vent holes 212. The waterproof and breathable membrane 220 has multiple third vent holes 221. The silicone membrane 230 has multiple fourth vent holes 231 and multiple fifth vent holes 232.

[0031] The first vent 211, the fourth vent 231, and the first through hole 121 are axially aligned, meaning they are coaxially opposite each other. Similarly, the second vent 212, the third vent 221, and the fifth vent 232 are axially aligned, meaning they are coaxially opposite each other.

[0032] The pressure ring 300 extends into the first cavity 111 and abuts against the spring sheet diaphragm assembly 200. Multiple second through holes 320 are provided on the peripheral wall of the pressure ring 300, and the second through holes 320 connect the first cavity 111 and the external environment.

[0033] Specifically, the pressure ring 300 has a hollow tubular structure. The lower end of the peripheral wall of the pressure ring 300 abuts against the area of ​​the spring sheet 210 where the first vent hole 211 and the second vent hole 212 are not provided, thus pressing and fixing the spring sheet membrane assembly 200 onto the platform portion 120. The hollow portion of the pressure ring 300 forms a cavity 310 that communicates with the first vent hole 211 and the second vent hole 212. A second through hole 320 is formed on the peripheral wall of the pressure ring 300, connecting the cavity 310 to the external environment.

[0034] like Figure 2As shown, the spring-loaded membrane assembly 200 can deform under the influence of air pressure inside the battery pack. Specifically, when the air pressure inside the battery pack is less than or equal to a preset air pressure value, the silicone membrane 230 abuts against the platform portion 120. When the air pressure inside the battery pack rises to exceed the preset air pressure value, the air pressure pushes the spring-loaded membrane assembly 200 to deform upwards, so that the silicone membrane 230 moves away from the platform portion 120.

[0035] Specifically, in some embodiments of this application, the preset air pressure value is 5 kPa to 20 kPa. When the internal air pressure of the battery pack is less than or equal to the preset air pressure value, the spring sheet diaphragm assembly 200 remains in contact with the platform portion 120. When the internal air pressure of the battery pack is greater than the preset air pressure value, the spring sheet diaphragm assembly 200 deforms upward under the action of air pressure, and the silicone membrane 230 moves away from the platform portion 120.

[0036] The working principle of the explosion-proof vent valve in this application is as follows: When the internal air pressure of the battery pack is less than or equal to the preset air pressure value, the spring membrane assembly 200 abuts against the platform part 120. The gas inside the battery pack enters the cavity 310 of the pressure ring 300 through the second cavity 112, the first through hole 121, the fourth vent 231, the waterproof and breathable membrane 220, and the first vent 211 in sequence, and is then discharged to the external environment through the second through hole 320, achieving normal ventilation.

[0037] When the internal air pressure of the battery pack exceeds the preset air pressure value, the spring-loaded membrane assembly 200 deforms upward under the action of air pressure, and the silicone membrane 230 moves away from the platform portion 120. At this time, there is a distance between the spring-loaded membrane assembly 200 and the platform portion 120, and the aforementioned normal venting channel remains open. Simultaneously, because the silicone membrane 230 moves away from the platform portion 120, the fifth vent 232 is no longer blocked by the platform portion 120, and the gas inside the battery pack can sequentially enter the cavity 310 through the second cavity 112, the first through hole 121, the fifth vent 232, the third vent 221, and the second vent 212, and then be discharged to the external environment through the second through hole 320. That is, under high pressure, the first channel formed by the first vent 211 and the fourth vent 231 and the second vent 212, and the second channel formed by the third vent 221 and the fifth vent 232, open simultaneously, significantly increasing the pressure relief area and achieving rapid pressure relief.

[0038] After the high pressure is released, the internal air pressure of the battery pack drops below the preset air pressure value. The spring sheet membrane assembly 200 returns to its initial position under its own elastic restoring force, the silicone membrane 230 re-abuts against the platform part 120, the second channel 320 closes, and the normal air permeability is restored.

[0039] Specifically, please refer to Figure 1In this application, multiple second through holes 320 are evenly spaced along the peripheral wall of the pressure ring 300. By evenly distributing the second through holes 320 on the peripheral wall of the pressure ring 300, the airflow distribution is uniform when the gas is discharged from the cavity 310 to the external environment, avoiding local airflow concentration that may cause noise or vibration, while also increasing the total exhaust cross-sectional area.

[0040] like Figure 3 As shown, in this embodiment, the multiple second vent holes 212 on the spring piece 210 are arranged at intervals along the first cross-shaped trajectory, that is, the multiple second vent holes 212 are arranged in an intersecting cross shape. The multiple first vent holes 211 are respectively disposed in the four quadrant regions divided by the first cross-shaped trajectory.

[0041] Multiple third vent holes 221 on the waterproof and breathable membrane 220 are arranged at intervals along the second cross-shaped trajectory, that is, multiple third vent holes 221 are arranged in an intersecting cross shape.

[0042] Multiple fifth vent holes 232 on the silicone membrane 230 are arranged at intervals along the third cross-shaped trajectory, that is, the multiple fifth vent holes 232 are arranged in an intersecting cross shape. Multiple fourth vent holes 231 are respectively set in the four quadrant regions divided by the third cross-shaped trajectory.

[0043] It is understandable that the first cross-shaped trajectory, the second cross-shaped trajectory, and the third cross-shaped trajectory are relative to each other in the axial direction.

[0044] By arranging the second vent 212, the third vent 221, and the fifth vent 232 of the second channel in a cross shape, the second channel forms a cross distribution in the central region of the spring sheet membrane assembly 200. Under high pressure, the gas is concentrated and discharged from the central region, resulting in high pressure relief efficiency. The first vent 211 and the fourth vent 231 of the first channel are distributed in the four quadrants of the cross shape, forming a spatial complement with the second channel, resulting in uniform gas distribution and good structural strength.

[0045] Specifically, the diameter of the first vent 211 is larger than that of the second vent 212. The diameter of the fourth vent 231 is larger than that of the fifth vent 232. Thus, under low pressure, the flow area of ​​the first channel is larger than that of the second channel, and gas preferentially passes through the first channel, resulting in lower flow resistance.

[0046] Meanwhile, the diameter of the fourth vent 231 is greater than or equal to the diameter of the first through hole 121. In this way, no additional throttling resistance is generated when gas enters the fourth vent 231 from the first through hole 121, ensuring smooth airflow.

[0047] like Figure 4As shown, in this embodiment, the platform portion 120 has a recessed area 122 that is recessed towards the second cavity 112, and an annular portion 123 is formed around the recessed area 122. A first through hole 121 is provided at the bottom of the recessed area 122. The silicone membrane 230 abuts against the recessed area 122, and the fourth vent hole 231 is aligned with the first through hole 121. The area on the silicone membrane 230 where the fourth vent hole 231 and the fifth vent hole 232 are not provided (i.e., the edge of the silicone membrane 230) abuts against the annular portion 123.

[0048] In a preferred embodiment, the pressure ring 300 and the first cavity 111 are connected by an interference fit. During assembly, the pressure ring 300 is pressed into the first cavity 111, and the friction generated by the interference fit fixes the pressure ring 300 in the valve body 100. At the same time, the pressure ring 300 applies a clamping force to the spring diaphragm assembly 200 to ensure that the silicone diaphragm 230 and the platform portion 120 are in tight contact.

[0049] The use of interference fit connection eliminates the need for threads or snap-fit ​​structures, further reducing the number of parts, simplifying the assembly process, and lowering manufacturing costs.

[0050] This application also provides a battery pack, including the explosion-proof vent valve of any of the above embodiments. The explosion-proof vent valve is installed on the battery pack housing, with the second cavity 112 of the valve body communicating with the inside of the battery pack, and the second through hole 320 of the pressure ring 300 communicating with the external environment. When the internal air pressure of the battery pack is normal, the explosion-proof vent valve maintains normal ventilation, keeping the internal and external air pressures of the battery pack balanced; when the internal air pressure of the battery pack abnormally increases, the explosion-proof vent valve quickly releases pressure, preventing the battery pack from exploding or bulging.

[0051] The explosion-proof ventilated valve and battery pack provided in this application can simultaneously achieve normal ventilation under low pressure and rapid pressure relief under high pressure by using only a three-layer stacked spring membrane assembly 200 consisting of spring sheet 210, waterproof and ventilated membrane 220 and silicone membrane 230. It does not require additional pressure relief mechanisms such as valve core, spring, and sealing ring. The structure is simple, the number of parts is small, the manufacturing cost is low, and the layers are fixedly connected, ensuring reliable long-term use.

[0052] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0053] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0058] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0059] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An explosion-proof vent valve, applied to a battery pack, characterized in that, Includes valve body, spring diaphragm assembly, and pressure ring; The valve body is provided with a through hole that runs through the axial direction. A platform portion is provided inside the through hole. The platform portion divides the through hole into a first cavity and a second cavity that are distributed along the axial direction. The platform portion is provided with a plurality of first through holes, which connect the first cavity and the second cavity. The spring sheet membrane assembly is disposed in the first cavity, and includes a spring sheet, a waterproof and breathable membrane and a silicone membrane stacked and fixedly connected in sequence, wherein the silicone membrane abuts against the platform portion; The spring sheet is provided with a plurality of first vent holes and a plurality of second vent holes, the waterproof and breathable membrane is provided with a plurality of third vent holes, and the silicone membrane is provided with a plurality of fourth vent holes and a plurality of fifth vent holes. The first vent holes, the fourth vent holes and the first through hole are axially corresponding to each other, and the second vent holes, the third vent holes and the fifth vent holes are axially corresponding to each other. The pressure ring extends into the first cavity and abuts against the spring sheet diaphragm assembly. The peripheral wall of the pressure ring is provided with a plurality of second through holes, which connect the first cavity to the external environment. The spring-loaded membrane assembly can deform under the pressure inside the battery pack to move the silicone membrane away from the platform portion.

2. The explosion-proof vent valve according to claim 1, characterized in that, The diameter of the first vent is larger than that of the second vent, and the diameter of the fourth vent is larger than that of the fifth vent.

3. The explosion-proof vent valve according to claim 1, characterized in that, The diameter of the fourth vent hole is greater than or equal to the diameter of the first through hole.

4. The explosion-proof vent valve according to claim 1, characterized in that, The multiple second vent holes on the spring are arranged at intervals along the first cross-shaped trajectory, and the multiple first vent holes are respectively set in the four quadrant regions divided by the first cross-shaped trajectory. The multiple third vent holes on the waterproof and breathable membrane are arranged at intervals along the second cross-shaped trajectory; The plurality of fifth vent holes on the silicone membrane are arranged at intervals along the third cross-shaped trajectory, and the plurality of fourth vent holes are respectively disposed in the four quadrant regions divided by the third cross-shaped trajectory.

5. The explosion-proof vent valve according to claim 1, characterized in that, The platform portion has a recessed area that is recessed toward the second cavity. An annular portion is formed around the recessed area. The first through hole is provided in the recessed area. The silicone membrane abuts against the recessed area. The fourth vent hole is connected to the first through hole one by one. The area on the silicone membrane that does not have the fourth vent hole and the fifth vent hole abuts against the annular portion.

6. The explosion-proof vent valve according to claim 1, characterized in that, The pressure ring has a hollow tubular structure. The lower end of the peripheral wall of the pressure ring abuts against the area of ​​the spring piece where the first vent hole and the second vent hole are not provided. The hollow part of the pressure ring forms a cavity that communicates with the first vent hole and the second vent hole. The second through hole is opened on the peripheral wall of the pressure ring and connects the cavity with the external environment.

7. The explosion-proof vent valve according to claim 1, characterized in that, Multiple second through holes are evenly spaced along the peripheral wall of the pressure ring.

8. The explosion-proof vent valve according to claim 1, characterized in that, The spring sheet, the waterproof and breathable membrane, and the silicone membrane are fixedly connected as one unit by hot pressing or bonding.

9. The explosion-proof vent valve according to claim 1, characterized in that, The pressure ring and the first cavity are connected by an interference fit.

10. A battery pack, characterized in that, Includes the explosion-proof vent valve as described in any one of claims 1-9.

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