A waterproof and breathable valve and battery pack

Abstract

The utility model provides a waterproof breather valve, including breather valve casing, breather membrane and breather valve outer cover, be provided with the taper tip on breather valve outer cover, the tip of taper tip is towards breather membrane, when the first real -time pressure intensity that the gas in the battery package inside acts on breather membrane reaches at least first preset exhaust pressure, breather membrane protrudes to the side of taper tip and is punctured by taper tip, forms first pressure relief passage, breather valve outer cover includes fixed part, separation part, a plurality of buffer muscle, when the second real -time pressure intensity that high pressure gas acts on separation part reaches at least second preset exhaust pressure, buffer muscle breaks to separate from fixed part, forms second pressure relief passage. The waterproof breather valve, through the setting of breather membrane and the taper tip setting on breather valve outer cover, and combine the setting of buffer muscle and separation part on breather valve outer cover, form first pressure relief passage and second pressure relief passage, at least solved the inherent defects of traditional breather valve's high opening pressure and easy premature closure in the pressure relief process.

Description

Technical Field

[0001] This utility model belongs to the field of battery pack technology, specifically relating to a waterproof and breathable valve and a battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the safety performance of power battery packs has increasingly become a focus of industry attention. Battery packs operate in complex and variable environments, requiring a balance between internal pressure and the external environment. On one hand, battery packs need excellent sealing to prevent the intrusion of external contaminants such as moisture and dust, which could affect battery life and electrical safety. On the other hand, in extreme situations such as thermal runaway, a large amount of high-temperature, high-pressure gas can be instantly generated inside the pack. If this pressure is not released promptly and quickly, the battery pack casing may bulge, tear, or even explode, leading to serious safety accidents.

[0003] To address the aforementioned contradictions, waterproof and breathable valves (also known as explosion-proof valves) have become one of the key safety components of battery packs. Existing waterproof and breathable valves typically employ a membrane or valve plate structure, which, while providing everyday waterproof and breathable functions, also possesses an explosion-proof function that allows for pressure relief under specific pressure conditions.

[0004] However, existing waterproof and breathable valves still have significant technical shortcomings when dealing with extreme conditions such as battery thermal runaway, specifically in the following two aspects: First, the valve body's opening reliability is insufficient. Existing explosion-proof valve designs typically require extremely high pressure buildup inside the battery pack for the outer cover to be dislodged, or some explosion-proof valves have covers that are designed to be non-dislodable. This excessively high opening pressure threshold delays the pressure relief timing, potentially leading to excessively high pressure peaks during rapid gas generation in the event of thermal runaway.

[0005] Secondly, there is a risk of premature valve closure, leading to incomplete venting. Existing explosion-proof valves typically employ a mechanism similar to a pressure switch, requiring internal pressure to reach a preset opening force (such as overcoming spring preload or sealant adhesion) before opening. In the early stages of thermal runaway, the internal pressure rapidly reaches this threshold, causing the valve to open and vent. However, as some gas is released, the internal pressure of the battery pack briefly decreases. Once the internal pressure falls below the valve's closing threshold, the valve closes rapidly. But at this point, the battery cells within the pack may still be undergoing a chain reaction, releasing high-temperature flammable gases. The valve's closure interrupts the pressure relief process, trapping these flammable gases and heat within the battery pack, causing internal pressure to accumulate again, creating a vicious cycle of "pressure relief-closure-re-pressure increase." This not only fails to achieve continuous and thorough pressure relief but also significantly increases the risk of secondary combustion or explosion of the battery pack.

[0006] In summary, existing waterproof and breathable valves have inherent drawbacks when dealing with battery thermal runaway, such as high opening pressure and premature closure during depressurization, making it difficult to meet the requirements of rapid and thorough depressurization of battery packs under extreme conditions. Utility Model Content

[0007] One objective of this invention is to provide a waterproof and breathable valve. By incorporating a breathable membrane and a conical tip on the outer cover of the valve, an increase in gas pressure within the battery pack pushes the breathable membrane towards the conical tip. The conical tip punctures the breathable membrane, creating a first pressure relief channel for immediate venting. This solves the problems of existing waterproof and breathable valves requiring a high opening pressure threshold and having a delayed pressure relief timing. Furthermore, this waterproof and breathable valve incorporates a separation section within the outer cover. When the gas pressure within the battery pack acting on the separation section increases to a second preset venting pressure, it punctures the outer cover, causing the separation section to detach from the fixed section and creating a second pressure relief channel. This achieves rapid and efficient pressure relief, preventing the waterproof and breathable valve from closing again and interrupting venting due to a temporary decrease in gas pressure within the battery pack.

[0008] The second objective of this invention is to provide a battery pack that utilizes the aforementioned waterproof and breathable valve. This allows the battery pack to release gas promptly and thoroughly, ensuring battery pack safety, extending battery pack lifespan, and reducing battery pack costs. To achieve the above objectives, this utility model discloses a waterproof and breathable valve for a battery pack, comprising a breathable valve housing, a breathable membrane, and a breathable valve cover. The vent valve housing is configured to be mounted with the battery pack; The breathable membrane is disposed between the breathable valve housing and the breathable valve cover. The breathable membrane includes a first surface and a second surface. The first surface faces the breathable valve cover, the second surface is sealed to the breathable valve housing, and the second surface faces the inside of the battery pack. The outer cover of the vent valve is provided with at least one cone tip facing the first surface, and the tip of the cone tip faces the first surface. The vent membrane is configured to move toward the cone tip side and be punctured by the cone tip when the first real-time pressure of the gas inside the battery pack acting on the second surface reaches at least the first preset exhaust pressure, forming a first pressure relief channel. The outer cover of the vent valve includes a fixed part, a separating part, and a plurality of buffer ribs connecting the fixed part and the separating part. The fixed part is detachably connected to the vent valve housing, and an exhaust hole is formed between the separating part and the fixed part. The buffer ribs are configured to break off from the fixed part when the second real-time pressure of the high-pressure gas acting on the separating part reaches at least the second preset exhaust pressure, thereby forming a second pressure relief channel.

[0009] As an optional implementation, the outer cover of the vent valve is provided with a plurality of cone tips facing the first surface, and the cone tips are arranged in an array.

[0010] As an optional implementation, the cone tip is disposed on the separation portion.

[0011] As an optional implementation, the vent holes are distributed in a continuous or discontinuous ring along the circumferential direction between the fixed part and the separating part.

[0012] As an optional implementation, the separating part is provided once, and the separating part is circular. One end of the buffer rib is fixedly connected to the outer peripheral surface of the separating part, and the other end of the buffer rib extends radially along the separating part and is fixedly connected to the fixing part.

[0013] As an optional implementation, the outer diameter of the separation section is adapted to the inner diameter of the vent valve housing.

[0014] As an optional implementation, the distance between the first surface of the breathable membrane and the tip of the cone is greater than or equal to the thickness of the breathable membrane, but less than or equal to three times the thickness of the breathable membrane.

[0015] As an optional implementation, a first limiting groove is provided on the vent valve housing, and a first sealing ring is provided in the first limiting groove. The first sealing ring contacts the second surface of the vent membrane and seals the contact surface between the second surface and the vent valve housing. The vent valve housing is provided with a second limiting groove, and a second sealing ring is provided in the second limiting groove. The second sealing ring seals the contact surface between the vent valve housing and the battery pack. The first limiting groove and the second limiting groove are staggered in the axial direction. The inner diameter of the second limiting groove is greater than the inner diameter of the first limiting groove and the outer diameter of the second limiting groove is greater than the outer diameter of the first limiting groove, or the inner diameter of the second limiting groove is less than the inner diameter of the first limiting groove and the outer diameter of the second limiting groove is less than the outer diameter of the first limiting groove.

[0016] As an optional implementation, the fixing part is provided with a connecting part, the connecting part is located outside the outer peripheral surface of the vent valve housing, the connecting part is provided with a connecting groove, and the outer peripheral surface of the vent valve housing is provided with a connecting buckle, the connecting buckle engages with the connecting groove, so as to realize the detachable connection between the vent valve cover and the vent valve housing.

[0017] A battery pack includes a battery pack housing and the aforementioned waterproof and breathable valve, wherein the breathable valve housing of the waterproof and breathable valve is detachably installed on the battery pack housing.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The waterproof and breathable valve of this utility model includes a breathable valve housing, a breathable membrane, and a breathable valve cover. The breathable membrane is disposed between the breathable valve housing and the breathable valve cover, and the breathable valve cover is provided with a cone tip facing the breathable membrane. When the first real-time pressure of the gas inside the battery pack applied to the second surface reaches at least the first preset exhaust pressure, the first surface of the breathable membrane actively moves towards the cone tip and is punctured by the cone tip, forming a first pressure relief channel on the breathable membrane. This timely releases the gas pressure inside the battery pack, effectively reducing the exhaust opening pressure threshold of the battery pack, ensuring timely exhaust of the battery pack, and avoiding the problem of excessively high pressure peak inside the battery pack caused by rapid gas generation due to thermal runaway.

[0019] This utility model discloses a waterproof and breathable valve, comprising a valve housing, a breathable membrane, and a valve cover. The valve cover includes a fixing part, a separating part, and several buffer ribs, with an exhaust hole formed between the fixing part and the separating part. When the second real-time pressure of the gas inside the battery pack applied to the separating part reaches at least the second preset exhaust pressure, the buffer ribs are broken, the separating part is dislodged, and a second pressure relief channel is obtained. At this time, the entire area where the separating part was originally installed can be vented, enabling the battery pack to expel the gas inside the battery pack in a timely and rapid manner even under extreme conditions of thermal runaway. At the same time, after the gas inside the battery pack is expelled and the gas pressure inside the battery pack decreases, the separating part cannot be restored, and the waterproof and breathable valve will not close again, avoiding the risk and problem of "premature closure" of the waterproof and breathable valve.

[0020] The battery pack of this utility model has the aforementioned waterproof and breathable valve, which allows the battery pack to obtain a first pressure relief channel and a second pressure relief channel in succession during the process of internal air pressure increase. This enables the high-pressure gas inside the battery pack to be discharged in a timely manner, while avoiding the thermal runaway problem caused by the waterproof and breathable valve closing again during internal pressure relief. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an exploded view of one embodiment of a waterproof and breathable valve according to this utility model.

[0023] Figure 2 This is an assembly drawing of one embodiment of a waterproof and breathable valve according to this utility model.

[0024] Figure 3 This is an isometric view of one embodiment of a waterproof and breathable valve according to this utility model.

[0025] Figure 4 This is a longitudinal cross-sectional schematic diagram of one embodiment of a waterproof and breathable valve according to this utility model.

[0026] Figure 5 This is an embodiment of the vent valve cover in this utility model.

[0027] Figure 6 These are several embodiments of the cone tip in this utility model.

[0028] Figure 7 This is a diagram illustrating one embodiment of the cone tip in this utility model.

[0029] Figure 8 This is a diagram illustrating one embodiment of the buffer rib in this utility model.

[0030] Figure 9 This is a diagram illustrating one embodiment of the buffer rib in this utility model.

[0031] Figure 10 This is an exploded view of another embodiment of the waterproof and breathable valve of this utility model.

[0032] Figure 11 These are two embodiments of the first and second limiting grooves in this utility model.

[0033] Explanation of key figure labels: 1. Vent valve cover; 11. Conical tip; 12. Separation part; 13. Fixing part; 14. Buffer rib; 15. Vent hole; 16. Connecting part; 17. Connecting slot; 2. Breathable membrane; 21. First surface; 22. Second surface; 3. Vent valve housing; 31. First limiting groove; 32. Second limiting groove; 33. First sealing ring; 34. Second sealing ring; 35. Connecting buckle. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0037] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0038] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0039] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0040] Please see Figures 1-11 As shown in the figure, this application embodiment provides a waterproof and breathable valve, which is mainly used on battery packs. When the internal pressure of the battery pack increases or increases to a preset exhaust pressure, it releases pressure to avoid battery pack safety problems caused by excessive internal pressure.

[0041] Please see Figures 1-3 An embodiment of a waterproof and breathable valve is provided. The waterproof and breathable valve of this embodiment includes a breathable valve housing 3, a breathable membrane 2, and a breathable valve outer cover 1.

[0042] The vent valve housing 3 is used to install the waterproof vent valve with the battery pack during installation, thereby fixing the waterproof vent valve on the battery pack.

[0043] In one embodiment, a pressure relief hole for depressurizing the battery pack is provided on the battery pack housing. When the waterproof vent valve is installed, the vent valve housing 3 is installed at the pressure relief hole position, so that the waterproof vent valve is connected to the inside of the battery pack. At the same time, when the pressure inside the battery pack increases or the pressure inside the battery pack increases to the preset exhaust pressure, pressure relief is achieved.

[0044] Please see Figure 1 In one embodiment, the breathable membrane 2 is disposed between the breathable valve housing 3 and the breathable valve cover 1. The breathable membrane 2 includes a first surface 21 and a second surface 22. The first surface 21 faces the breathable valve cover 1, the second surface 22 is sealed to the breathable valve housing 3, and the second surface 22 faces the inside of the battery pack, so that the breathable membrane 2 seals the battery pack.

[0045] In one embodiment, the breathable membrane 2 is made of a flexible material and is a waterproof and breathable membrane 2. It has the functions of being waterproof and breathable. That is, after the breathable membrane 2 is installed with the waterproof and breathable valve at the pressure relief hole position on the battery pack shell, it can isolate the inside of the battery pack from the external environment at the pressure relief hole position. This can prevent external dust, moisture and other substances from entering the inside of the battery pack. At the same time, it can maintain the air pressure balance between the inside of the battery pack and the external environment when the battery pack is working normally or stored.

[0046] In one embodiment, the breathable membrane 2 is made of EPTFE (glass fiber coated filter material), which is a high-performance waterproof and breathable material with a uniformly distributed microporous structure that allows gas molecules to pass through while blocking liquid water droplets.

[0047] Please see Figure 1 In one embodiment, the outer cover 1 of the vent valve is provided with at least one cone tip 11 facing the first surface 21, with the tip of the cone tip 11 pointing towards the first surface 21. The vent membrane 2 is configured to move toward the cone tip 11 and be punctured by the cone tip 11 when the first real-time pressure of the gas inside the battery pack acting on the second surface 22 reaches at least a first preset exhaust pressure, forming a first pressure relief channel. When the gas pressure inside the battery pack increases, the vent membrane 2 is punctured by the cone tip 11, forming the first pressure relief channel, at which time the high-pressure gas inside the battery pack is released to the outside through the first pressure relief channel.

[0048] The breathable membrane 2, as its name suggests, is easily deformed under high pressure inside the battery pack. Specifically, it easily moves towards the cone tip 11, bulging towards it and is easily punctured by the cone tip 11, thus easily forming and opening the first pressure relief channel. When the breathable membrane 2 is punctured by the cone tip 11, forming the first pressure relief channel, the high-pressure gas inside the battery pack is released outward through this channel. This solves the problems of high opening pressure thresholds and delayed pressure relief in traditional waterproof vent valves, and also addresses the issue of excessively high pressure peaks that may occur during rapid gas generation in the event of thermal runaway. During the pressure increase inside the battery pack, the high pressure causes the breathable membrane 2 to bulge towards the cone tip 11 and be punctured, ensuring timely pressure relief and avoiding excessively high pressure peaks caused by rapid gas generation during thermal runaway. The use of the breathable membrane 2 in this waterproof vent valve reduces the pressure relief opening threshold of the battery pack.

[0049] After the internal pressure of the battery pack increases, the gas inside the battery pack will expand towards the breathable membrane 2. At this time, the pressure acting on the second surface 22 is the first real-time pressure.

[0050] After the second surface 22 is subjected to the internal pressure of the battery pack, the breathable membrane 2 bulges towards the cone tip 11. When the breathable membrane 2 comes into contact with the cone tip 11 and is punctured by the cone tip 11, the pressure on the second surface 22 is the first preset exhaust pressure.

[0051] The magnitude of the first preset exhaust pressure is related to the properties of the breathable membrane 2 itself, such as its thickness and toughness. The greater the thickness and toughness of the breathable membrane 2, the less likely it is to bulge towards the cone tip 11 and be punctured by it, resulting in a higher first preset exhaust pressure. The magnitude of the first preset exhaust pressure is also related to the distance between the first surface 21 of the breathable membrane 2 and the tip of the cone tip 11. The greater the distance between the first surface 21 of the breathable membrane 2 and the tip of the cone tip 11, the larger the bulge of the breathable membrane 2 towards the cone tip 11, and the higher the first preset exhaust pressure.

[0052] Conversely, the designer can select or set a threshold for the first preset exhaust pressure based on the battery pack installation level and safety requirements. Then, based on the determined first preset exhaust pressure, the designer can reversely select a suitable breathable membrane 2 or the installation position of the breathable membrane 2, such as selecting a breathable membrane 2 of a certain model, thickness, toughness, or material, and determine the distance between the breathable membrane 2 and the cone tip 11.

[0053] Please see Figure 4In one embodiment, the distance between the first surface 21 of the breathable membrane 2 and the tip of the cone 11 is greater than or equal to the thickness of the breathable membrane 2, but less than or equal to three times the thickness of the breathable membrane 2. This ensures that when the first real-time pressure of the gas inside the battery pack acting on the second surface 22 reaches at least the first preset exhaust pressure, the breathable membrane 2 bulges towards the cone 11, making it easier for the breathable membrane 2 to be punctured by the cone 11. At the same time, when the battery pack is working normally, the breathable membrane 2 does not come into contact with the cone 11, and the breathable membrane 2 will not be accidentally punctured by the cone 11, ensuring the normal operation of the waterproof breathable valve.

[0054] The change in pressure of the gas inside the battery pack acting on the second surface 22 may be linear or non-linear. Therefore, during the process of the pressure inside the battery pack increasing, the magnitude of the first real-time pressure acting on the second surface 22 may change abruptly, that is, the first real-time pressure may change abruptly from a state less than the first preset exhaust pressure to a state greater than the first preset exhaust pressure. Therefore, when the first real-time pressure of the gas inside the battery pack acting on the second surface 22 reaches at least the first preset exhaust pressure, the breathable membrane 2 bulges towards the cone tip 11, that is, the first real-time pressure is equal to the first preset exhaust pressure or the first real-time pressure is greater than the first preset exhaust pressure, and the breathable membrane 2 is punctured by the cone tip 11 to form the first pressure relief channel.

[0055] It should be noted that the first pressure relief channel may be formed by the various membrane pores on the breathable membrane 2 punctured by the cone tip 11. After the breathable membrane 2 is punctured by the cone tip 11, the breathable membrane 2 may be torn due to its own tension, and the torn part of the breathable membrane 2 can also relieve pressure. That is, the first pressure relief channel may also be formed by the various membrane pores on the breathable membrane 2 punctured by the cone tip 11 and the torn part of the breathable membrane 2.

[0056] After the breathable membrane 2 is punctured, a first pressure relief channel is formed, at which point the high-pressure gas inside the battery pack is released outward through the first pressure relief channel. If the pressure inside the battery pack continues to rise, a large amount of gas will continuously be released outward through the first pressure relief channel. As a result, a large amount of gas will accumulate between the first surface 21 of the breathable membrane 2 and the inner surface of the vent valve cover 1. To ensure the safety of the battery pack, pressure relief is required through the vent valve cover 1. This ensures both the rapid and complete release of the high-temperature, high-pressure gas from the battery pack.

[0057] In order to allow for pressure relief through the outer cover 1 of this waterproof vent valve when a large amount of gas accumulates between the first surface 21 of the vent membrane 2 and the inner surface of the vent valve cover 1, please refer to [link to relevant documentation]. Figure 5In one embodiment, the vent valve cover 1 includes a fixing part 13, a separating part 12, and a plurality of buffer ribs 14 connecting the fixing part 13 and the separating part 12. The fixing part 13 is detachably connected to the vent valve housing 3, and an exhaust hole 15 is formed between the separating part 12 and the fixing part 13. The buffer ribs 14 are configured to break and detach from the fixing part 13 when the second real-time pressure of the high-pressure gas acting on the separating part 12 reaches at least a second preset exhaust pressure, forming a second pressure relief channel.

[0058] After the breathable membrane 2 is punctured, a first pressure relief channel is formed. At this time, the high-pressure gas in the battery pack is released outward through the first pressure relief channel. Most of the gas passing through the first pressure relief channel accumulates between the first surface 21 of the breathable membrane 2 and the inner surface of the outer cover 1 of the breathable valve. That is, at this time, a large amount of high-pressure gas acts on the surface of the separation part 12 facing the breathable membrane 2, and the separation part 12 is squeezed outward. When the second real-time pressure acting on the separation part 12 reaches at least the second preset exhaust pressure, the buffer rib 14 is torn. At this time, the separation part 12 is separated from the fixing part 13 and the separation part 12 is separated from the outer cover 1 of the breathable valve. At this time, the original position of the separation part 12 and the original position of the exhaust hole 15 on the outer cover 1 of the breathable valve form a second pressure relief channel. After the second pressure relief channel is formed, the high-temperature and high-pressure gas that was originally accumulated between the first surface 21 of the ventilated membrane 2 and the inner surface of the ventilated valve cover 1 is instantly released outward. At the same time, the high-temperature and high-pressure gas inside the battery pack continues to be released outward through the first pressure relief channel, and the high-pressure gas released through the first pressure relief channel will then continue to be released outward through the second pressure relief channel, thereby achieving pressure relief of the battery pack.

[0059] After the first pressure relief channel is formed, the high-pressure gas inside the battery pack is released outward through the first pressure relief channel. Most of the gas passing through the first pressure relief channel accumulates between the first surface 21 of the vent membrane 2 and the inner surface of the vent valve cover 1. A large amount of high-pressure gas acts on the inner surface of the vent valve cover 1, that is, a large amount of high-pressure gas acts on the separation part 12. This provides the pressure conditions for the separation part 12 to detach from the fixed part. That is, the formation of the second pressure relief channel does not only depend on the pressure inside the battery pack, but also on the accumulation of gas pressure in the separation part 12 in the early stage. The high-pressure gas inside the battery pack is released outward through the first pressure relief channel. Most of the gas passing through the first pressure relief channel accumulates between the first surface 21 of the vent membrane 2 and the separation part 12. At this time, the pressure acting on the separation part 12 may be greater than the pressure inside the battery pack, thus providing conditions for the rapid formation of the second pressure relief channel.

[0060] The formation of the second pressure relief channel allows the high-temperature and high-pressure gas inside the battery pack to be discharged quickly. Even in the extreme case of thermal runaway, the gas inside the battery pack can be discharged in a timely and rapid manner.

[0061] In addition, once the first pressure relief channel is formed, it will always exist. Even if the gas pressure inside the battery pack decreases, the first pressure relief channel will not close or shrink. This will prevent high-pressure gas or heat from being trapped inside the battery pack, which would cause the internal pressure to accumulate again and form a vicious cycle of "pressure relief-closure-repressurization". This will avoid the risk of secondary combustion or explosion of the battery pack and will allow for the complete discharge of high-temperature gas from the battery pack.

[0062] Similarly, once the second pressure relief channel is formed, it will always exist. Even if the gas pressure inside the battery pack decreases, the first pressure relief channel will not close or shrink. This will prevent high-pressure gas or heat from being trapped inside the battery pack, which would cause the internal pressure to accumulate again and form a vicious cycle of "pressure relief-closure-repressurization". This will avoid the risk of secondary combustion or explosion of the battery pack and will allow for the complete discharge of high-temperature gas from the battery pack.

[0063] In this waterproof and breathable valve, the arrangement of the breathable valve housing 3, the breathable membrane 2, and the breathable valve cover 1, and the fact that the breathable valve cover 1 has at least one cone tip 11 facing the breathable membrane 2, with the tip of the cone tip 11 facing the breathable membrane 2 and used to puncture the breathable membrane 2 to form a first pressure relief channel, combined with the fixing part 13, the separating part 12, and several buffer ribs 14 connecting the fixing part 13 and the separating part 12 on the breathable valve cover 1, enables this waterproof and breathable valve to simultaneously solve the inherent defects of traditional waterproof and breathable valves, such as high opening pressure and premature closure during pressure relief, thus meeting the requirements of rapid and thorough pressure relief of the battery pack under extreme conditions.

[0064] The outer cover 1 of the vent valve includes a fixing part 13, a separating part 12, and a plurality of buffer ribs 14 connecting the fixing part 13 and the separating part 12. An exhaust hole 15 is formed between the separating part 12 and the fixing part 13. After the first pressure relief channel is formed, the exhaust hole 15 is connected to the first pressure relief channel. At this time, the high-pressure gas in the battery pack is discharged outward through the first pressure relief channel. Most of the gas passing through the first pressure relief channel is concentrated between the first surface 21 of the vent membrane 2 and the inner surface of the outer cover 1 of the vent valve. Then, some gas will be discharged outward through the exhaust hole 15. If the internal pressure of the battery pack stops increasing, most of the high-temperature and high-pressure gas accumulated between the first surface 21 of the breathable membrane 2 and the inner surface of the outer cover 1 of the breathable valve will be released outward through the exhaust port 15. The separation part 12 will not detach from the fixing part 13 temporarily, and the second pressure relief channel will not be formed temporarily. At this time, due to the presence of the separation part 12, the area of ​​the breathable membrane 2 is protected to a certain extent. The waterproof breathable valve can continue to work for a period of time. It is not necessary to replace the breathable membrane 2 or the waterproof breathable valve immediately. The battery pack will not fail immediately, providing conditions for rescue and normal operation of the battery pack.

[0065] Of course, after the second pressure relief channel is formed and the battery pack pressure relief is completed, the user can restore the function of the waterproof vent valve and the battery pack by replacing the waterproof vent valve.

[0066] It should be noted that after the first pressure relief channel is formed, the high-pressure gas in the battery pack is released outward through the first pressure relief channel. Most of the gas passing through the first pressure relief channel accumulates between the first surface 21 of the breathable membrane 2 and the inner surface of the separation part 12. At this time, the gas pressure acting on the inner surface of the separation part 12 is the second real-time pressure.

[0067] When the separating part 12 is squeezed by high-pressure gas accumulated between the first surface 21 of the breathable membrane 2 and the inner surface of the separating part 12, the buffer rib 14 is torn, and the separating part 12 detaches from the fixing part 13. When the separating part 12 detaches from the fixing part 13, the pressure on the separating part 12 is the second preset exhaust pressure.

[0068] The magnitude of the second preset exhaust pressure is mainly related to the strength of the buffer rib 14; the greater the strength of the buffer rib 14, the greater the second preset exhaust pressure. The magnitude of the second preset exhaust pressure is also related to the area of ​​the separation section 12; the smaller the area of ​​the separation section 12, the greater the second preset exhaust pressure. Conversely, the designer can select or set a threshold for the second preset exhaust pressure based on the battery pack installation level and safety requirements. Then, based on the determined second preset exhaust pressure, the strength of the buffer rib 14 is designed in reverse to ensure that when the second real-time pressure reaches the second preset exhaust pressure, the buffer rib 14 is torn, and the second pressure relief channel is formed.

[0069] Please see Figure 6 In one embodiment (a), the vent valve cover 1 has a cone tip 11 facing the first surface 21. The cone tip 11 makes the vent valve cover 1 simple in structure, easy to form, and low in cost.

[0070] Please see Figure 6 In one embodiment (b), the outer cover 1 of the vent valve is provided with a plurality of cone tips 11 facing the first surface 21, and the cone tips 11 are arranged in an array, specifically in a matrix arrangement.

[0071] Please see Figure 6 In one embodiment, the outer cover 1 of the vent valve is provided with a plurality of cone tips 11 facing the first surface 21, and the cone tips 11 are arranged in an array, specifically in a ring array.

[0072] In the above embodiments regarding the number of cone tips 11, multiple cone tips 11 are provided and arranged in an array to ensure that the breathable membrane 2 is punctured.

[0073] After being placed inside the waterproof and breathable valve for a long time, the breathable membrane 2 will harden, making it difficult to puncture. At this time, multiple cone tips 11 are set to ensure that the breathable membrane 2 can be punctured and to ensure that the first pressure relief channel is quickly formed.

[0074] The multiple conical tips 11 are designed so that after thermal runaway of the battery cells in the battery pack, the high-temperature gas increases the pressure inside the battery pack, causing the venting membrane 2 to bulge outward. This allows the venting membrane 2 to come into contact with the conical tips 11, puncturing the venting membrane 2. The venting membrane 2 can be punctured by multiple conical tips 11 simultaneously or sequentially, forming multiple exhaust channels. The design of multiple conical tips 11 accelerates the rupture speed of the venting membrane 2, allowing the high-temperature gas to be discharged more quickly, improving the timeliness of exhaust, further reducing the pressure rise rate inside the battery pack, and enhancing the thermal runaway protection effect.

[0075] The multiple cone tips 11, arranged in an array, reduce the difficulty of puncturing the breathable membrane 2. The multiple cone tips 11 disperse the force applied to the breathable membrane 2, avoiding the situation where a single cone tip 11 might be unable to puncture a thick membrane due to concentrated force. Even if the breathable membrane 2 hardens to a certain extent due to material properties or usage time, the multiple cone tips 11 can puncture it more easily, ensuring reliable triggering of the exhaust function.

[0076] The multi-conical tip 11 is arranged in an array to optimize the exhaust distribution. After the breathable membrane 2 is punctured by the multi-conical tip 11, multiple exhaust holes are formed. When the high-temperature gas is discharged from these dispersed holes, the airflow distribution is more uniform, reducing the turbulence caused by excessive local airflow concentration, allowing the gas to flow more smoothly towards the exhaust hole and improving exhaust efficiency.

[0077] The multiple conical tips 11, arranged in an array, reduce membrane residue blockage. When a single conical tip 11 punctures the breathable membrane 2, a large amount of membrane residue or debris may block the exhaust channel. After being punctured by multiple conical tips 11, the damage to the breathable membrane 2 is more dispersed and finer, and the residual membrane or debris is less likely to block the exhaust channel over a large area, ensuring unobstructed exhaust in the initial stage. Here, the exhaust channel refers to the first pressure relief channel, and also to the exhaust hole 15 formed between the separating part 12 and the fixing part 13.

[0078] The system features multiple conical tips 11 arranged in an array to distribute stress, with each tip 11 serving as a backup for the others. Under normal operating conditions without thermal runaway, the breathable membrane 2 will have slight contact with the tips 11 (or experience minor compression due to air pressure fluctuations). The multi-tip structure disperses the reaction force of the breathable membrane 2 on the tips 11, preventing individual tips 11 from wearing down or deforming due to long-term concentrated stress, thus extending the service life of the tips 11 and ensuring the long-term reliability of the puncture function during thermal runaway.

[0079] Please see Figure 6In one embodiment, the cone tip 11 is disposed on the separation portion 12. The cone tip 11 is located inside the vent 15 formed between the separation portion 12 and the fixing portion 13. This causes the high-temperature gas inside the battery pack to increase the internal pressure, causing the breathable membrane 2 to bulge outwards and be punctured in the middle. A first pressure relief channel is located inside the vent 15 and near the middle of the breathable membrane 2. The separation portion 12 covers the outside of the first pressure relief channel. The first pressure relief channel, located near the middle of the breathable membrane 2, combined with the obstruction of the separation portion 12, guides and disperses the airflow passing through the first pressure relief channel, preventing reverse splashing. After thermal runaway of the cells in the battery pack, the gas discharged from the battery pack may contain electrolyte droplets, burning particles, etc. At this time, these impurities are discharged with the high temperature and high pressure airflow. After impacting the inner surface of the separation part 12, they spread to the surroundings, effectively preventing the high temperature and high pressure airflow and the impurities mixed in the airflow from splashing out of the waterproof and breathable valve, thus protecting the cleanliness and safety of the site.

[0080] Please see Figure 7 This is one embodiment of the cone tip 11. As its name suggests, the cone tip 11 has a cone-shaped structure. Multiple cone tips 11 are disposed on the inner surface of the separation section 12. When high-temperature and high-pressure gas in the battery pack is discharged from the first pressure relief channel, the airflow impacts the cone tips 11. The cone-shaped structure of the cone tips 11 can pierce and initially disperse large particles of spray, preventing large particles of spray from being ejected from the waterproof vent valve.

[0081] Please see Figure 8 In one embodiment, the exhaust holes 15 are arranged in a continuous or discontinuous ring along the circumferential direction between the fixing part 13 and the separating part 12. The exhaust holes 15 are located between the separating part 12 and the fixing part, and are arranged in a ring shape. After the first pressure relief channel is formed, and before the second pressure relief channel is formed, they cooperate with the first pressure relief channel to discharge the high-temperature, high-pressure gas passing through the first pressure relief channel. The circumferential arrangement of the exhaust holes 15 facilitates the smooth discharge of the airflow dispersed by the separating part 12 and the cone tip 11.

[0082] Please see Figure 8 In one embodiment, a single separating portion 12 is provided, and the separating portion 12 is circular. One end of the buffer rib 14 is fixedly connected to the outer peripheral surface of the separating portion 12, and the other end of the buffer rib 14 extends radially along the separating portion 12 and is fixedly connected to the fixing portion 13.

[0083] Please review Figure 8As can be seen, the structure between two adjacent exhaust holes 15 is a buffer rib 14. After the first pressure relief channel is formed on the breathable membrane 2, the high-pressure gas passing through the first pressure relief channel impacts the cone tip 11 and the separation part 12, and then diffuses outward and is discharged through the exhaust hole 15. After the high-pressure gas is diffused by the cone tip 11 and the separation part 12, when it moves to the pressure relief hole, some gas still comes into contact with the buffer rib 14. At this time, the buffer rib 14 can further intercept and disperse the gas and the particulate impurities mixed in the gas, making the gas discharged from the exhaust hole 15 "cleaner" and reducing pollution and damage to the external environment or the surrounding components of the battery pack.

[0084] In summary, the buffer rib 14 serves to guide and disperse airflow. The cone tip 11 punctures the breathable membrane 2, forming a first pressure relief channel. Airflow exits from this channel and, upon contact with the buffer rib 14, is guided by it, dispersing the airflow along the gaps or edges of the ribs. Finally, the airflow exits through the exhaust port 15. This exhaust process—cone tip 11 puncturing the membrane, buffer rib 14 guiding the airflow, and exhaust port 15 discharging the air—reduces airflow turbulence, improves exhaust efficiency, and prevents damage to other components of the battery pack from concentrated high-temperature gas injection.

[0085] To enhance the guiding and dispersing effect of the buffer ribs 14 on airflow, in one embodiment, multiple buffer ribs 14 can be provided, distributed along a ring interval to form multiple evenly distributed exhaust holes 15.

[0086] The multiple buffer ribs 14 enhance the rigidity of the vent valve cover 1, reducing deformation caused by external pressure and temperature changes during normal use. This ensures the relative stability of the shape and position of the vent holes 15, thereby guaranteeing the stable and reliable venting performance of the vent valve. Simultaneously, the multiple buffer ribs 14 effectively disperse the stress generated by the high-temperature gas impact during thermal runaway. When high-temperature gas impacts the cover, each buffer rib 14 bears a portion of the impact force, preventing stress concentration in one area and thus avoiding rapid damage or breakage of the cover. The evenly distributed buffer ribs 14 result in uniformly distributed vent holes 15, allowing for more even discharge of high-temperature gas and preventing gas from concentrating in a few vent holes 15, which could lead to excessive localized airflow and poor venting in other areas. This allows for a more balanced decrease in pressure within the battery pack, effectively preventing damage to the battery pack structure caused by rapid localized pressure changes.

[0087] Multiple buffer ribs 14 can buffer the gas flow. After the breathable membrane 2 is punctured by the cone tip 11, the high-temperature gas impacts the outer cover 1 of the breathable valve through the puncture in the breathable membrane 2. The buffer ribs 14 can buffer these airflows, reducing the direct impact of gas on the puncture in the breathable membrane 2, preventing the puncture from further expanding or tearing, thereby extending the effective working time of the breathable membrane 2 during thermal runaway and ensuring the normal exhaust function of the breathable valve. The buffer ribs 14 can also block larger particulate impurities (such as breathable membrane 2 debris, electrolyte condensate particles, etc.) ejected from the puncture in the breathable membrane 2 to a certain extent, preventing these impurities from clogging the exhaust port 15, ensuring the unobstructed flow of the exhaust port 15, and allowing the exhaust process to proceed smoothly.

[0088] One end of the buffer rib 14 is fixedly connected to the outer peripheral surface of the separation part 12, and the other end of the buffer rib 14 extends radially along the separation part 12 and is fixedly connected to the fixing part 13. That is, the buffer rib 14 realizes the fixation and installation of the separation part 12, and realizes the fixed connection of the separation part 12 to the fixing part 13. After the first pressure relief channel is formed, the high-pressure gas in the battery pack is released outward through the first pressure relief channel. Most of the gas passing through the first pressure relief channel accumulates between the first surface 21 of the vent membrane 2 and the inner surface of the vent valve cover 1. That is, at this time, a large amount of high-pressure gas acts on the surface of the separation part 12 facing the vent membrane 2, and the separation part 12 is squeezed outward. When the second real-time pressure acting on the separation part 12 reaches at least the second preset exhaust pressure, the buffer rib 14 is torn, the separation part 12 is separated from the vent valve housing 3, and the second pressure relief channel is formed.

[0089] It can be seen that the main function of the buffer rib 14 is to fix the separation part 12 to the vent valve housing 3. At this time, it is necessary to ensure that the buffer rib 14 has a certain strength to prevent the buffer rib 14 from deforming during operation and causing the separation part 12 to change position. This prevents the hard gas vent membrane 2 from being damaged due to the change in the position of the separation part 12, and ensures that the buffer rib 14, the separation part 12 and the vent membrane 2 remain intact before the first real-time pressure of the gas inside the battery pack acting on the second surface 22 reaches the first preset exhaust pressure.

[0090] The buffer rib 14 securely connects the separating part 12 to the vent valve housing 3, and also secures the separating part 12 to the fixing part 13. Before ejection, the separating part 12 radially limits the vent membrane 2. The separating part 12 is merely a "cover plate" and does not actually hold the vent membrane 2. Before ejection, the separating part 12 radially presses against the inner ring of the fixing part 13, preventing the clamping force of the fixing part 13 on the vent membrane 2 from loosening due to internal pressure, thus indirectly providing a "radial limiting" effect on the vent membrane 2. "Radial limiting" can be understood as follows: the separating part 12 supports the fixing part 13, preventing the fixing part 13 from radially expanding or deforming during the pre-compression stage, thereby maintaining the sealing and positioning of the edge of the vent membrane 2 and preventing membrane slippage, wrinkling, or premature rupture.

[0091] Another function of the buffer rib 14 is to be torn apart when the second real-time pressure acting on the separation section 12 reaches at least the second preset exhaust pressure. To ensure that the buffer rib 14 is successfully torn apart when the second real-time pressure acting on the separation section 12 reaches at least the second preset exhaust pressure, a locally thinned portion is provided on the buffer rib 14. On the one hand, the locally thinned portion itself has less strength than the other parts of the buffer rib 14, making it easier to tear; on the other hand, stress concentration is likely to occur at the connection point between the locally thinned portion and other parts of the buffer rib 14, making the connection point prone to tearing.

[0092] Please see Figure 9 In one embodiment of the buffer rib 14, an arc-shaped concave region is provided on the buffer rib 14 to form a locally thinned portion.

[0093] In one embodiment, a notch area may also be provided on the buffer rib 14 to form a locally thinned portion.

[0094] In one embodiment, the buffer rib 14 can also be configured to be gradually narrowed, such as gradually narrowing in the width direction or gradually thinning in the thickness direction.

[0095] To ensure that the buffer ribs 14 are successfully torn when the second real-time pressure acting on the separation section 12 reaches at least the second preset exhaust pressure, the number of buffer ribs 14 should not be too large to avoid obstruction. Simultaneously, the width and thickness of the buffer ribs 14 need to be designed to ensure that when the second real-time pressure reaches the second preset exhaust pressure, each buffer rib 14 is successfully torn, the separation section 12 successfully separates from the vent valve housing 3, and the second pressure relief channel is successfully established.

[0096] Please refer to it again. Figure 4 In one embodiment, the outer diameter of the separation part 12 is adapted to the inner diameter of the vent valve housing 3, thereby maximizing the outer diameter of the separation part 12 so that the cross-section of the second pressure relief channel is basically the same as the effective air passage area of ​​the vent valve housing 3, thereby improving the pressure relief efficiency of the second pressure relief channel.

[0097] A pressure relief hole for battery pack venting is provided on the battery pack housing. During the installation of the waterproof vent valve, the vent valve housing 3 is installed at the pressure relief hole position. The main body of the vent valve housing 3 has a ring-shaped structure, which is adapted to the structure of the pressure relief hole, and the inner diameter of the ring structure is adapted to the size of the pressure relief hole. This makes the venting area of ​​the pressure relief hole on the battery pack housing match the venting area of ​​the vent valve housing 3, increasing the venting area and improving venting efficiency. The outer diameter of the separation part 12 is adapted to the inner diameter of the vent valve housing 3, increasing the area of ​​the separation part 12, that is, increasing the cross-sectional area of ​​the second pressure relief channel. This makes the venting area of ​​the waterproof vent valve close to or the same as that of the pressure relief hole, resulting in good venting capacity.

[0098] The outer diameter of the separating part 12 is adapted to the inner diameter of the vent valve housing 3, which can better ensure that the separating part 12 radially presses against the inner ring of the fixing part 13 before being ejected, so that the clamping force of the fixing part 13 on the vent membrane 2 will not loosen due to internal pressure, thus indirectly playing a "radial limiting" role on the vent membrane 2.

[0099] Please see Figure 10 In one embodiment, a first limiting groove 31 is provided on the vent valve housing 3, and a first sealing ring 33 is provided in the first limiting groove 31. The first sealing ring 33 contacts the second surface 22 of the vent membrane 2 and seals the contact surface between the second surface 22 and the vent valve housing 3.

[0100] A second limiting groove 32 is provided on the vent valve housing 3, and a second sealing ring 34 is provided in the second limiting groove 32. The second sealing ring 34 seals the contact surface between the vent valve housing 3 and the battery pack.

[0101] The first limiting groove 31 and the second limiting groove 32 are staggered in the axial direction.

[0102] Please see Figure 11 In one embodiment, the inner diameter of the second limiting groove 32 is greater than the inner diameter of the first limiting groove 31, and the outer diameter of the second limiting groove 32 is greater than the outer diameter of the first limiting groove 31.

[0103] Please see Figure 11 In one embodiment (e), the inner diameter of the second limiting groove 32 is smaller than the inner diameter of the first limiting groove 31, and the outer diameter of the second limiting groove 32 is smaller than the outer diameter of the first limiting groove 31.

[0104] The first limiting groove 31 and the second limiting groove 32 are staggered in the axial direction to avoid stress concentration at the location where the first limiting groove 31 and the second limiting groove 32 are located, to avoid the formation of a stress concentration zone when the first limiting groove 31 and the second limiting groove 32 are located on the same cross section, to avoid the bottom of the first limiting groove 31 and the second limiting groove 32 being torn, and to reduce the probability of deformation of the vent valve housing 3. The staggered arrangement of the first limiting groove 31 and the second limiting groove 32 in the axial direction increases the structural strength of the housing.

[0105] In one embodiment, the first sealing ring 33 is an O-ring structure seal that is embedded in the vent valve housing 3 to ensure the sealing between the vent membrane 2, the vent valve outer cover 1, and the vent valve outer shell.

[0106] In one embodiment, the second sealing ring 34 is a double-peaked sealing element embedded in the vent valve housing 3 to ensure a good seal when assembled with the battery pack housing.

[0107] Please refer to it again. Figure 10In one embodiment, a connecting part 16 is provided on the fixing part 13 of the vent valve outer cover 1, and the connecting part 16 is located outside the outer peripheral surface of the vent valve housing 3. A connecting groove 17 is provided on the connecting part 16, and a connecting buckle 35 is provided on the outer peripheral surface of the vent valve housing 3. The connecting buckle 35 engages with the connecting groove 17 to achieve a detachable connection between the vent valve outer cover 1 and the vent valve housing 3.

[0108] To facilitate disassembly and replacement of the breathable membrane 2, the outer cover 1 of the breathable valve is designed to snap onto the breathable valve housing 3. Furthermore, to prevent the connecting snap 35 from breaking through the buffer rib 14 before it does, the locking force of the connecting snap 35 needs to be greater than the breaking strength of the buffer rib 14.

[0109] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A waterproof and breathable valve for a battery pack, characterized in that, It includes a breather valve housing (3), a breather membrane (2), and a breather valve cover (1); The vent valve housing (3) is configured to be mounted with the battery pack; The breathable membrane (2) is disposed between the breathable valve housing (3) and the breathable valve cover (1). The breathable membrane (2) includes a first surface (21) and a second surface (22). The first surface (21) faces the breathable valve cover (1), and the second surface (22) is sealed to the breathable valve housing (3) and faces the inside of the battery pack. The outer cover (1) of the vent valve is provided with at least one cone tip (11) facing the first surface (21), the tip of the cone tip (11) facing the first surface (21), and the vent membrane (2) is configured to move toward the cone tip (11) and be punctured by the cone tip (11) when the first real-time pressure of the gas inside the battery pack acting on the second surface (22) reaches at least the first preset exhaust pressure, forming a first pressure relief channel; The outer cover (1) of the vent valve includes a fixing part (13), a separating part (12), and a plurality of buffer ribs (14) connecting the fixing part (13) and the separating part (12). The fixing part (13) is detachably connected to the vent valve housing (3). An exhaust hole (15) is formed between the separating part (12) and the fixing part (13). The buffer ribs (14) are configured to break off from the fixing part (13) when the second real-time pressure of the high-pressure gas acting on the separating part (12) reaches at least the second preset exhaust pressure, forming a second pressure relief channel.

2. The waterproof and breathable valve according to claim 1, characterized in that, The outer cover (1) of the vent valve is provided with a plurality of cone tips (11) facing the first surface (21), and the cone tips (11) are arranged in an array.

3. The waterproof and breathable valve according to claim 1 or 2, characterized in that, The cone tip (11) is disposed on the separation part (12).

4. The waterproof and breathable valve according to claim 1, characterized in that, The exhaust holes (15) are distributed in a continuous or discontinuous ring along the circumference between the fixing part (13) and the separating part (12).

5. The waterproof and breathable valve according to claim 1, characterized in that, The separation part (12) is provided in one form and is circular. One end of the buffer rib (14) is fixedly connected to the outer peripheral surface of the separation part (12), and the other end of the buffer rib (14) extends radially along the separation part (12) and is fixedly connected to the fixing part (13).

6. The waterproof and breathable valve according to claim 5, characterized in that, The outer diameter of the separation part (12) is adapted to the inner diameter of the vent valve housing (3).

7. The waterproof and breathable valve according to claim 1, characterized in that, The distance between the first surface (21) of the breathable membrane (2) and the tip of the cone (11) is greater than or equal to the thickness of the breathable membrane (2), but less than or equal to three times the thickness of the breathable membrane (2).

8. The waterproof and breathable valve according to claim 1, characterized in that, The vent valve housing (3) is provided with a first limiting groove (31), and a first sealing ring (33) is provided in the first limiting groove (31). The first sealing ring (33) contacts the second surface (22) of the vent membrane (2) and seals the contact surface between the second surface (22) and the vent valve housing (3). The vent valve housing (3) is provided with a second limiting groove (32), and a second sealing ring (34) is provided in the second limiting groove (32). The second sealing ring (34) seals the contact surface between the vent valve housing (3) and the battery pack. The first limiting groove (31) and the second limiting groove (32) are staggered in the axial direction. The inner diameter of the second limiting groove (32) is greater than the inner diameter of the first limiting groove (31) and the outer diameter of the second limiting groove (32) is greater than the outer diameter of the first limiting groove (31). Alternatively, the inner diameter of the second limiting groove (32) is less than the inner diameter of the first limiting groove (31) and the outer diameter of the second limiting groove (32) is less than the outer diameter of the first limiting groove (31).

9. The waterproof and breathable valve according to claim 1, characterized in that, The fixing part (13) is provided with a connecting part (16), which is located outside the outer peripheral surface of the vent valve housing (3). The connecting part (16) is provided with a connecting slot (17), and the outer peripheral surface of the vent valve housing (3) is provided with a connecting buckle (35). The connecting buckle (35) engages with the connecting slot (17) to achieve a detachable connection between the vent valve cover (1) and the vent valve housing (3).

10. A battery pack, characterized in that, The device includes a battery pack housing and a waterproof and breathable valve as described in any one of claims 1 to 9, wherein the housing (3) of the waterproof and breathable valve is detachably mounted to the battery pack housing.

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