Explosion-proof valve and battery pack

Abstract

The utility model belongs to the technical field of battery accessories, and provides an explosion-proof valve and a battery pack, wherein the explosion-proof valve comprises a fixed body and a movable component, wherein the fixed body is suitable for being connected to the explosion-proof port of the battery pack, and the movable component is movably connected to the fixed body, and the movable component comprises a cover body, wherein the cover body is provided with a first flow guiding slope along the circumference, and the cover body has a first side and a second side opposite to each other, wherein the first side faces away from the battery pack, and the second side contacts the battery pack, and the first flow guiding slope gradually faces away from the center of the cover body from the first side toward the second side. The explosion-proof valve provided by the utility model, by providing the first flow guiding slope in the circumference of the cover body, allows the stress of the water flow to be perpendicular to the first flow guiding slope and toward the direction of the battery pack, thereby pressing the cover body and the battery pack tightly to prevent the cover body from being separated from the battery pack under the action of the water flow.

Description

Technical Field

[0001] The utility model relates to the technical field of battery accessories, in particular to an explosion-proof valve and a battery pack. Background Art

[0002] With the continuous development of new energy vehicles, the market share of new energy vehicles is constantly increasing, and the safety requirements of new energy vehicle battery packs are also constantly increasing. At present, explosion-proof valves are usually installed on battery packs. Once the internal pressure of the battery pack is too high, the gas in the battery pack can be directly discharged to the outside through the explosion-proof valve. However, when the explosion-proof valve discharges gas, water will also be generated around the explosion-proof valve. During the operation of the car, the water will impact the explosion-proof valve with the shaking of the car, causing the explosion-proof valve to fall off from the battery pack, creating a safety hazard. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides an explosion-proof valve to prevent the explosion-proof valve from falling off from the battery pack when it is impacted by water.

[0004] The utility model also provides a battery pack.

[0005] The utility model provides an explosion-proof valve, comprising:

[0006] A fixed body, the fixed body being adapted to be connected to an explosion-proof opening of a battery pack;

[0007] A movable component, wherein the movable component is movably connected to the fixed body, the movable component includes a cover body, the cover body is provided with a first guide slope along the circumference, the cover body has a first side and a second side opposite to each other, the first side is away from the battery pack, the second side is in contact with the battery pack, and the first guide slope gradually moves away from the center of the cover body from the first side toward the second side.

[0008] According to the explosion-proof valve provided by the utility model, the cover body includes:

[0009] A cover body, wherein the first flow guiding inclined surface is arranged along the circumference of the cover body;

[0010] A waterproof boss protrudes from the first side surface of the cover body, a second flow guiding slope is arranged at the bottom of the waterproof boss, and the second flow guiding slope has the same inclination direction as the first flow guiding slope.

[0011] According to the explosion-proof valve provided by the utility model, the waterproof boss is provided with air holes, the number of the air holes is more than three, the fixed body is provided with guide plates along the circumferential direction, the guide plates correspond to the air holes one by one, and the guide plates abut against the cover body.

[0012] According to the explosion-proof valve provided by the utility model, a waterproof flange is provided on the top of the waterproof boss along the circumferential direction.

[0013] The explosion-proof valve provided by the utility model further comprises a waterproof and breathable membrane, and the waterproof and breathable membrane covers the breathable hole.

[0014] According to the explosion-proof valve provided by the utility model, the waterproof boss is provided with a groove, the waterproof breathable membrane is arranged in the groove, and the groove is provided with a mounting slope along the circumferential direction so that the waterproof breathable membrane is attached to the mounting slope.

[0015] According to the explosion-proof valve provided by the utility model, a limiting plate is further provided on the cover body, and the limiting plate covers the waterproof breathable membrane to fix and limit the waterproof breathable membrane on the cover body.

[0016] According to the explosion-proof valve provided by the utility model, the fixed body is provided with mounting bosses along the circumferential direction, the number of the mounting bosses is three or more, the mounting bosses have a first matching portion, the cover body has a second matching portion, one of the first matching portion and the second matching portion is a limiting protrusion, and the other is a limiting groove, the limiting protrusion cooperates with the limiting groove to fix the fixed body to the cover body.

[0017] The explosion-proof valve provided by the utility model further includes a sealing ring, the sealing ring is provided with a protrusion, the cover body is provided with a receiving groove and a limiting opening, the sealing ring is arranged in the receiving groove, and the protrusion passes through and is located at the limiting opening.

[0018] The utility model also provides a battery pack, comprising:

[0019] A battery pack body, wherein the battery pack body is provided with an explosion-proof opening;

[0020] The above-mentioned explosion-proof valve is installed at the explosion-proof port.

[0021] The explosion-proof valve provided by the utility model is provided with a first guide slope in the circumferential direction of the cover body so that the stress of the water flow can be perpendicular to the first guide slope and toward the direction of the battery pack, thereby pressing the cover body and the battery pack tightly to prevent the cover body from being separated from the battery pack under the action of the water flow, thereby reducing potential safety hazards, improving the stability of the explosion-proof valve, reducing the wear and looseness between the explosion-proof valve and the battery pack, and extending the overall service life of the battery pack and the explosion-proof valve.

[0022] The battery pack provided by the present invention includes the above-mentioned explosion-proof valve, and thus also has the beneficial effects of the above-mentioned explosion-proof valve, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the force on the explosion-proof valve when it is impacted by water flow in the related technology.

[0025] Figure 2 It is a structural schematic diagram of the explosion-proof valve provided by the utility model.

[0026] Figure 3 This is another structural schematic diagram of the explosion-proof valve provided by the utility model.

[0027] Figure 4 yes Figure 3 Cross-sectional view along CC direction.

[0028] Figure 5 yes Figure 4 A partial enlarged view of point A.

[0029] Figure 6 yes Figure 4 A partial enlarged view of point B.

[0030] Figure 7 It is a structural explosion diagram of the explosion-proof valve provided by the utility model.

[0031] Reference numerals:

[0032] 100. Explosion-proof valve;

[0033] 110, fixed body; 111, guide vane; 112, mounting boss; 1121, limiting protrusion; 113, slide groove;

[0034] 120, movable assembly; 121, cover body; 1211, limiting groove; 1212, containing groove; 1213, limiting opening;

[0035] 122, cover body; 1221, first flow guiding slope; 1222, sliding part;

[0036] 123, waterproof boss; 1231, second guide slope; 1232, air vent; 1233, waterproof flange; 1234, groove; 1235, installation slope;

[0037] 124, waterproof breathable membrane; 125, limiting plate; 126, sealing ring; 1261, protrusion;

[0038] 127, elastic member; 128, moving block;

[0039] 130. Fixed plate; 131. Opening. DETAILED DESCRIPTION

[0040] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0041] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Figure 1 It is an explosion-proof valve in the related art. In the related art, when water around the explosion-proof valve 100' impacts the explosion-proof valve 100', the cover 121' of the explosion-proof valve 100' is subjected to the stress of the water, which may cause the cover 121' to flip open and separate from the fixed body 110' and the battery pack, causing safety hazards.

[0046] Combine the following Figure 2-Figure 7 The explosion-proof valve 100 of the present invention is described.

[0047] like Figure 2 As shown, the utility model provides an explosion-proof valve 100, including a fixed body 110 and a movable assembly 120. It should be noted that the explosion-proof valve 100 provided by the utility model is applied to a battery pack. When the pressure of the battery pack is too high, the explosion-proof valve 100 can discharge the gas in the battery pack. Specifically, Figure 2 As shown, the fixed body 110 is connected to an explosion-proof port (not shown in the figure) of a battery pack (not shown in the figure), and the movable component 120 is movably connected to the fixed body 110. The movable component 120 includes a cover body 121, and the cover body 121 is circumferentially provided with a first guide slope 1221. The cover body 121 has a first side and a second side opposite to each other, the first side is away from the battery pack, and the second side is in contact with the battery pack, and the first guide slope 1221 gradually moves away from the center of the cover body 121 from the first side toward the second side.

[0048] When the water flow hits the cover 121, the stress of the water flow on the cover 121 is perpendicular to the first guide slope 1221. At this time, the stress of the water flow will be in the direction of the battery pack, so that the cover 121 and the battery pack are pressed tightly to prevent the explosion-proof valve 100 from falling off and failing to release the pressure in time, thereby reducing potential safety hazards, improving the stability of the explosion-proof valve 100, reducing the wear and looseness between the explosion-proof valve 100 and the battery pack, and extending the overall service life of the battery pack and the explosion-proof valve 100. The good sealing of the explosion-proof valve 100 can also prevent impurities and moisture in the external environment from entering the battery pack, protect the cleanliness and dryness of the inside of the battery pack, and further improve the reliability of the explosion-proof system composed of the battery pack and the explosion-proof valve 100.

[0049] According to the explosion-proof valve 100 provided by the utility model, by arranging the first guide slope 1221 on the circumference of the cover body 121, the stress of the water flow can be perpendicular to the first guide slope 1221 and toward the direction of the battery pack, thereby pressing the cover body 121 and the battery pack to prevent the cover body 121 from separating from the battery pack under the action of the water flow, thereby reducing potential safety hazards, improving the stability of the explosion-proof valve 100, reducing the wear and looseness between the explosion-proof valve 100 and the battery pack, and extending the overall service life of the battery pack and the explosion-proof valve 100.

[0050] like Figure 2 As shown, in some embodiments of the present invention, the cover body 121 includes a cover body 122 and a waterproof boss 123. The first guide slope 1221 is arranged along the circumference of the cover body 122, and the waterproof boss 123 protrudes from the first side surface of the cover body 122. A second guide slope 1231 is arranged at the bottom of the waterproof boss 123, and the second guide slope 1231 has the same inclination direction as the first guide slope 1221. By providing the second guide slope 1231, the impact force of the water flow is more effectively dispersed and converted into a pressing force between the cover body 121 and the battery pack, further improving the firmness of the explosion-proof valve 100.

[0051] like Figure 7As shown, in some embodiments of the utility model, the waterproof boss 123 is provided with air holes 1232, and there are three or more air holes 1232. The waterproof boss 123 can prevent external water from flowing into the battery pack through the air holes 1232, thereby enhancing the waterproof performance of the entire explosion-proof valve 100. In this way, the interior of the battery pack can be better protected from external moisture erosion and potential safety hazards can be avoided. The fixed body 110 is provided with guide plates 111 along the circumference, and the guide plates 111 correspond to the air holes 1232 one by one. For example, when there are three air holes 1232, there are also three guide plates 111. When the explosion-proof valve 100 is in an open state, the guide plates 111 can guide the gas in the battery pack to the exhaust space, thereby accelerating the gas discharge speed, reducing gas accumulation, and improving the safety of the explosion-proof valve 100. When the explosion-proof valve 100 is in a closed state, the guide piece 111 abuts against the cover body 121 . When the explosion-proof valve 100 is in a closed state, the guide piece 111 abuts against the cover body 121 .

[0052] like Figure 2 As shown, in some embodiments of the present invention, a waterproof flange 1233 is provided on the top of the waterproof boss 123 along the circumferential direction. The waterproof flange 1233 can prevent the water flow from further penetrating into the area of ​​the vent hole 1232, thereby forming a stronger waterproof barrier for the battery pack, reducing the risk of internal components being invaded by water, and protecting the safety and stability of the battery pack. In addition, the waterproof flange 1233 can disperse and slow down the direct impact force of the water flow, further reducing the force of the water flow on the explosion-proof valve 100. In this way, not only the explosion-proof valve 100 itself is protected, but also the integrity and stability of the connection between the explosion-proof valve 100 and the battery pack are protected.

[0053] like Figure 7 As shown, in some embodiments of the present invention, the explosion-proof valve 100 also includes a waterproof breathable membrane 124, which covers the vent 1232. The waterproof breathable membrane 124 can allow gas to pass through, thereby ensuring that the gas inside the battery pack can be discharged smoothly through the vent 1232 to prevent the risk caused by excessive internal air pressure. The waterproof breathable membrane 124 can prevent water from penetrating, so that the waterproof breathable membrane 124 can prevent moisture from entering the battery pack through the vent 1232, especially in rain, moisture or splashing water that may be encountered during vehicle driving, providing reliable waterproof protection. In addition, the waterproof breathable membrane 124 is a one-way membrane, ensuring that gas can only be discharged from the inside of the battery pack and cannot enter from the outside, which prevents external pollutants and moisture from entering the battery pack, and further protects the stability and cleanliness of the interior. Among them, the waterproof breathable membrane 124 is connected to the waterproof boss 123 by hot melting, thereby ensuring the stability of the connection between the waterproof breathable membrane 124 and the explosion-proof valve 100.

[0054] like Figure 4 and Figure 5 As shown, in some embodiments of the utility model, the waterproof boss 123 is provided with a groove 1234, and the waterproof breathable membrane 124 is arranged in the groove 1234. In the related art, the peripheral wall of the groove 1234 of the waterproof boss 123 forms a right angle with the bottom wall of the groove 1234, but this is easy to form small holes on the waterproof breathable membrane 124, and it is not convenient to install the waterproof breathable membrane 124. Therefore, the groove 1234 is provided with a mounting bevel 1235 along the circumference, so that the waterproof breathable membrane 124 is attached to the mounting bevel 1235. Among them, the mounting bevel 1235 can make the waterproof breathable membrane 124 more easily attached to the groove 1234, and can also increase the melting area of ​​the waterproof breathable membrane 124, improve the reliability and durability of the bonding, make the waterproof breathable membrane 124 more easily and firmly attached to the groove 1234, prevent the waterproof breathable membrane 124 from falling off during use, and ensure the long-term stability and functionality of the waterproof breathable membrane 124.

[0055] In addition, through the design of the groove 1234 and the installation bevel 1235, the waterproof breathable membrane 124 can be more closely attached to the explosion-proof valve 100, thereby improving the overall sealing performance, preventing the infiltration of moisture and impurities, and ensuring that the gas can be discharged smoothly. In addition, the installation bevel 1235 helps to disperse stress and prevent stress concentration in a single direction, thereby reducing structural fatigue between the waterproof breathable membrane 124 and the explosion-proof valve 100, and improving the stability and life of the overall structure.

[0056] like Figure 2 and Figure 7 As shown, in some embodiments of the utility model, a limiting plate 125 is also provided on the cover 121, and the limiting plate 125 covers the waterproof breathable membrane 124 to fix the waterproof breathable membrane 124 on the cover 121. The limiting plate 125 covers the waterproof breathable membrane 124, which can provide additional fixing force for the waterproof breathable membrane 124 to prevent the membrane from shifting or falling off due to vibration, impact or other external forces during use. In addition, the limiting plate 125 can provide physical protection for the waterproof breathable membrane 124, reduce direct damage to the membrane by the external environment, such as scratches, wear or debris, thereby extending the service life of the waterproof breathable membrane 124. The limiting plate 125 can also make the waterproof breathable membrane 124 more closely and evenly fit on the cover 121, further improving the overall sealing effect and waterproof performance of the waterproof breathable membrane 124. In addition, the limiting plate 125 can also prevent the waterproof breathable membrane 124 from deforming due to changes in internal gas pressure or external environment.

[0057] like Figure 3-Figure 6As shown, in some embodiments of the present invention, the fixed body 110 is provided with mounting bosses 112 along the circumferential direction, and there are three or more mounting bosses 112. In this way, when gas rushes out of the explosion-proof valve 100, the three mounting bosses 112 can increase the stability of the fixed body 110, and prevent the mounting boss 112 on one side from being impacted by gas and unevenly stressed, which may cause the fixed body 110 to become loose, or tip over, causing looseness between the explosion-proof valve 100 and the battery pack, thereby creating a safety hazard. In addition, the three mounting bosses 112 can better disperse the impact force from the gas, improve the overall impact resistance of the explosion-proof valve 100, and thus enhance the durability and reliability of the system. The mounting boss 112 has a first mating portion, and the cover body 121 has a second mating portion. One of the first mating portion and the second mating portion is a limiting protrusion 1121, and the other is a limiting groove 1211. The limiting protrusion 1121 cooperates with the limiting groove 1211 to allow the fixing body 110 to be detachably fixed to the cover body 121.

[0058] like Figure 4 and Figure 7 As shown, in some embodiments of the present invention, the explosion-proof valve 100 also includes a sealing ring 126, the sealing ring 126 is provided with a protrusion 1261, the cover body 121 is provided with a receiving groove 1212 and a limiting opening 1213, and the sealing ring 126 is arranged in the receiving groove 1212, so that the sealing ring 126 can be accurately positioned inside the explosion-proof valve 100. The protrusion 1261 passes through and is located at the limiting opening 1213, ensuring that the sealing ring 126 is firmly fixed, thereby effectively enhancing the sealing between the explosion-proof valve 100 and the battery pack, and preventing the leakage of gas and liquid. In addition, the limiting opening 1213 can prevent the sealing ring 126 from being easily displaced or falling off when it is impacted by gas or other external forces, thereby maintaining the stability and reliability of the entire explosion-proof valve 100 structure. By fixing the protrusion 1261 of the sealing ring 126 in the limiting opening 1213, the sealing ring 126 is prevented from being worn and shifted during long-term use, thereby extending the service life of the sealing ring 126 and maintaining the long-term sealing performance of the explosion-proof valve 100.

[0059] In some embodiments of the present invention, the sealing ring 126 can be an elastic sealing ring 126, so that the elastic sealing ring 126 can absorb and alleviate external vibrations and impacts, protect the cover body 121 and other components, and further improve the performance stability of the entire explosion-proof valve 100 system.

[0060] like Figure 4As shown, in some embodiments of the present invention, the fixed body 110 is provided with a slide groove 113 along the axial direction, and the cover body 122 is provided with a sliding portion 1222, and the sliding portion 1222 penetrates the slide groove 113, and the sliding portion 1222 can slide in the slide groove 113, so that the sliding portion 1222 can switch between the initial position and the open position. When the sliding portion 1222 is in the initial position, the cover body 122 is attached to the battery pack, and the explosion-proof valve 100 is in a closed state. When the air pressure in the explosion-proof valve 100 increases, for example, when the air pressure in the explosion-proof valve 100 is greater than 30Pa, when the sliding portion 1222 slides along the slide groove 113 to the open position, the cover body 122 is separated from the battery pack, and an exhaust space is formed between the cover body 122 and the battery pack, the explosion-proof valve 100 is in an open state, the exhaust space is connected with the external space, and the gas in the battery pack can be discharged to the exhaust space.

[0061] like Figure 4 and Figure 7 As shown, in some embodiments of the present invention, the movable assembly 120 further includes an elastic member 127, which is disposed in the slide groove 113 and abuts against the sliding portion 1222. The elastic member 127 constantly provides elastic force for the cover body 122 to fit the battery pack. The explosion-proof valve 100 further includes a moving block 128, which is disposed in the slide groove 113 and clamps the sliding portion 1222.

[0062] The moving block 128 and the sliding part 1222 of the utility model are at the bottom of the elastic member 127, and the first direction is the vertical direction. When the pressure of the battery pack exceeds the first threshold value, the moving block 128 and the sliding part 122 slide upward along the first direction, compressing the elastic member 127, and the cover body 122 separates from the battery pack to form a first exhaust space. After the gas in the battery pack is discharged for a period of time, the pressure of the battery pack drops. When it drops below the first threshold value, the moving block 128 and the sliding part 1222 cannot be pushed to slide upward. At this time, the elastic force of the elastic member 127 causes the moving block 128 and the sliding part 122 to slide downward until the cover body 122 fits the battery pack.

[0063] The utility model further provides a battery pack, including a battery pack body (not shown) and the above-mentioned explosion-proof valve 100, wherein the battery pack body is provided with an explosion-proof opening, and the explosion-proof valve 100 is installed at the explosion-proof opening. The battery pack provided by the utility model includes the above-mentioned explosion-proof valve 100, and thus also has the beneficial effects of the above-mentioned explosion-proof valve 100, which will not be described in detail here.

[0064] like Figure 2-Figure 7 As shown, in some embodiments of the present invention, the battery pack also includes a fixing plate 130 , which is connected to the battery pack body and has an opening 131 matching the explosion-proof port, and the explosion-proof valve 100 is passed through the opening 131 and fixedly connected to the fixing plate 130 .

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An explosion-proof valve, characterized in that: include: A fixed body, the fixed body being adapted to be connected to an explosion-proof opening of a battery pack; A movable component, wherein the movable component is movably connected to the fixed body, the movable component includes a cover body, the cover body is provided with a first guide slope along the circumference, the cover body has a first side and a second side opposite to each other, the first side is away from the battery pack, the second side is in contact with the battery pack, and the first guide slope gradually moves away from the center of the cover body from the first side toward the second side.

2. The explosion-proof valve according to claim 1, characterized in that: The cover body comprises: A cover body, wherein the first flow guiding inclined surface is arranged along the circumference of the cover body; A waterproof boss protrudes from the first side surface of the cover body, a second flow guiding slope is arranged at the bottom of the waterproof boss, and the second flow guiding slope has the same inclination direction as the first flow guiding slope.

3. The explosion-proof valve according to claim 2, characterized in that: The waterproof boss is provided with ventilation holes, and there are more than three ventilation holes. The fixed body is provided with guide plates along the circumferential direction, and the guide plates correspond to the ventilation holes one by one, and the guide plates abut against the cover body.

4. The explosion-proof valve according to claim 2, characterized in that: The top of the waterproof boss is provided with a waterproof flange along the circumferential direction.

5. The explosion-proof valve according to claim 3, characterized in that: It also includes a waterproof and breathable membrane, which covers the air holes.

6. The explosion-proof valve according to claim 5, characterized in that: The waterproof boss is provided with a groove, the waterproof breathable membrane is arranged in the groove, and the groove is provided with a mounting inclined surface along the circumferential direction so that the waterproof breathable membrane is attached to the mounting inclined surface.

7. The explosion-proof valve according to claim 5, characterized in that: The cover body is also provided with a limiting plate, and the limiting plate covers the waterproof breathable membrane to fix and limit the waterproof breathable membrane on the cover body.

8. The explosion-proof valve according to claim 1, characterized in that: The fixed body is provided with mounting bosses along the circumferential direction, and there are three or more mounting bosses. The mounting bosses have a first matching portion, and the cover body has a second matching portion. One of the first matching portion and the second matching portion is a limiting protrusion, and the other is a limiting groove. The limiting protrusion cooperates with the limiting groove to fix the fixed body to the cover body.

9. The explosion-proof valve according to claim 1, characterized in that: It also includes a sealing ring, which is provided with a protruding portion, and the cover body is provided with a receiving groove and a limiting opening. The sealing ring is arranged in the receiving groove, and the protruding portion passes through and is located at the limiting opening.

10. A battery pack, characterized in that: include: A battery pack body, wherein the battery pack body is provided with an explosion-proof opening; According to any one of claims 1 to 9, the explosion-proof valve is installed at the explosion-proof port.

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