Explosion-proof valve and battery pack

Abstract

The invention provides an anti-explosion valve and a battery pack, relates to the technical field of batteries, and aims to improve the safety of the battery pack. The anti-explosion valve comprises a valve seat and a piston rod. The valve seat is provided with a first through opening and a second through opening, and the first through opening communicates with the second through opening. The piston rod is detachably connected with the valve seat and provided with a first position and a second position, the piston rod comprises a plug body and a rod body, the plug body is located at the first through opening and used for sealing the first through opening, and the rod body is connected with one end of the plug body and slidably penetrates through the second through opening. At the first position, the piston rod is connected with the valve seat. And at the second position, the piston rod is disconnected from the valve seat so as to open the first through opening. Therefore, the piston rod is separated from the valve seat, the plug body of the piston rod can open the first through opening, then the battery pack can be communicated with the outside through the valve seat, heat spreading in the battery pack can be delayed, rescue time can be won for a vehicle, and the safety of the battery pack can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an explosion-proof valve and a battery pack. Background Art

[0002] With the increasing popularity of new energy vehicles, fire accidents caused by thermal runaway of battery packs of new energy vehicles occur frequently. Since the battery pack of new energy vehicles is a sealed entity formed by a combination of multiple lithium batteries, controllers, etc., new energy vehicles are prone to spontaneous combustion of battery packs caused by thermal runaway of power batteries during driving or charging. In related technologies, when the battery pack catches fire, water can be directly sprayed on the ignition point of the vehicle to cool down and extinguish the fire, but this method is less efficient. The battery pack shell can also be punctured with a puncture tool, and then water or other fire extinguishing agents can be sprayed into the battery pack to extinguish the fire, but this requires the vehicle to be lifted, and the risk of fire extinguishing is higher. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides an explosion-proof valve and a battery pack to improve the safety of the battery pack.

[0004] In a first aspect, an embodiment of the present application provides an explosion-proof valve, which includes: a valve seat and a piston rod. The valve seat is provided with a first port and a second port, and the first port and the second port are in communication. The piston rod is detachably connected to the valve seat and has a first position and a second position. The piston rod includes a plug body and a rod body. The plug body is located at the first port and is used to close the first port. The rod body is connected to one end of the plug body and slidably penetrates the second port. In the first position, the piston rod is connected to the valve seat. In the second position, the piston rod is disconnected from the valve seat to open the first port.

[0005] According to the explosion-proof valve of the embodiment of the present application, by making the piston rod and the valve seat detachably connected, and making the rod body of the piston rod slidably penetrate the second opening of the valve seat, when the battery pack has thermal runaway, the piston rod can be moved in the direction away from the first opening, so that the piston rod and the valve seat are separated, and the plug body of the piston rod can open the first opening, so that the battery pack can be connected to the outside through the valve seat, and the rescue personnel can inject the fire extinguishing material into the battery pack through the valve seat, which can delay the spread of heat in the battery pack, thereby buying rescue time for the vehicle, and thus helping to improve the safety of the battery pack. At the same time, there is no need to lift the vehicle, which is conducive to reducing the risk of rescue, and it will not destroy the overall insulation of the battery pack, so as to avoid secondary injuries to rescue personnel. In addition, it is possible to avoid the provision of additional components, which is conducive to reducing the manufacturing cost of the battery pack.

[0006] In a possible implementation, the explosion-proof valve further includes an elastic member and a guide sleeve, the guide sleeve is sleeved on the rod body, and the elastic member is connected between the valve seat and the guide sleeve.

[0007] In one possible implementation, the explosion-proof valve also includes a locking piece, which is arranged at the end of the rod body away from the plug body, and the guide sleeve has a snap-fit ​​piece. In the first position, the locking piece is snap-fitted with the snap-fit ​​piece, and in the second position, the locking piece is disengaged from the snap-fit ​​piece.

[0008] In one possible implementation, the clamping member is a clamping hole opened on the guide sleeve, and the rod body can rotatably pass through the clamping hole. In the first position, a portion of the locking member intersects with the clamping hole and abuts against the guide sleeve. In the second position, the locking member overlaps with the clamping hole to pass through and disengage from the clamping hole.

[0009] In a possible implementation manner, the rod body and the guide sleeve are connected via threads.

[0010] In one possible implementation, the explosion-proof valve also includes a sleeve, which is connected to the valve seat, and the sleeve has a protection space. A guide protrusion is provided in the protection space, and the guide protrusion extends along the height direction of the explosion-proof valve. The guide sleeve has a guide groove, and the guide protrusion cooperates with the guide groove.

[0011] In a possible implementation, the explosion-proof valve further includes a cover body, which is connected to an end of the plug body away from the rod body, and a plurality of grooves are provided on the cover body, and the plurality of grooves are spaced apart in the circumferential direction of the cover body.

[0012] In a possible implementation manner, the groove is located at the edge of the cover body.

[0013] In a possible implementation, the cover body is detachably connected to the plug body, a vent hole is provided on the side wall of the cover body, and the vent hole is communicated with the breathable membrane.

[0014] In a second aspect, the present application provides a battery pack comprising the above-mentioned explosion-proof valve.

[0015] Among them, the technical effects brought about by any design method in the second aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of an explosion-proof valve provided for some embodiments of the present application;

[0019] Figure 2 A schematic diagram of an explosion-proof valve in an explosion-proof state provided in some embodiments of the present application;

[0020] Figure 3 A schematic diagram of a valve body provided for some embodiments of the present application;

[0021] Figure 4 A schematic diagram of an explosion-proof valve in a first position provided in some embodiments of the present application;

[0022] Figure 5 A schematic diagram of an explosion-proof valve in a second position provided in some embodiments of the present application;

[0023] Figure 6 A schematic diagram of an explosion-proof valve in a first position provided in some other embodiments of the present application;

[0024] Figure 7 A schematic diagram of an explosion-proof valve in a second position provided in some other embodiments of the present application;

[0025] Figure 8 A top view of an explosion-proof valve provided in some embodiments of the present application.

[0026] Reference numerals:

[0027] 100. Explosion-proof valve;

[0028] 1. Valve seat; 11. First port; 12. Second port;

[0029] 2. Piston rod; 21. Plug body; 22. Breathable membrane; 23. Channel; 24. Guide sleeve; 241. Snap-fit ​​hole; 25. Locking piece; 26. Rod body;

[0030] 3. Elastic parts;

[0031] 4. sheath; 41. guide protrusion;

[0032] 5. cover body; 51. vent hole; 52. groove;

[0033] 6. Sealing ring. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "back", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 should not be understood as a limitation on the present invention.

[0036] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. In addition, the directional terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only references to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, 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 a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0038] With the increasing popularity of new energy vehicles, fire accidents caused by thermal runaway of battery packs of new energy vehicles occur frequently. Since the battery pack of new energy vehicles is a sealed entity formed by a combination of multiple lithium batteries, controllers, etc., new energy vehicles are prone to spontaneous combustion of battery packs caused by thermal runaway of power batteries during driving or charging. In addition, once a lithium-ion battery spontaneously ignites due to thermal runaway, it is difficult to extinguish and re-ignites. In the related art, when the battery pack catches fire, water can be directly sprayed on the ignition point of the vehicle to cool down and extinguish the fire, but this method is less efficient. The battery pack shell can also be punctured with a puncture tool, and then water or other fire extinguishing agents can be sprayed into the battery pack to extinguish the battery fire, but this requires the vehicle to be lifted, and the risk of fire extinguishing is higher.

[0039] In order to solve the above-mentioned technical problems, the present application provides an explosion-proof valve and a battery pack.

[0040] The explosion-proof valve according to the embodiment of the present application is described below.

[0041] See also Figure 1-Figure 3 , Figure 1 A schematic diagram of an explosion-proof valve provided in some embodiments of the present application, Figure 2 A schematic diagram of an explosion-proof valve in an explosion-proof state provided in some embodiments of the present application, Figure 3 Schematic diagram of a valve body provided in some embodiments of the present application. The explosion-proof valve 100 may include a valve seat 1 , a piston rod 2 and a gas-permeable membrane 22 .

[0042] The valve seat 1 is provided with a first port 11 and a second port 12. The first port 11 is in communication with the second port 12. The first port 11 can be in communication with the interior of the battery pack.

[0043] The piston rod 2 may have a channel 23, and the channel 23 runs through the piston rod 2. The channel 23 may be connected to the inside of the battery pack.

[0044] The piston rod 2 may include a plug body 21 and a rod body 26. The plug body 21 is located at the first opening 11 and is used to close the first opening 11. The rod body 26 is connected to one end of the plug body 21 and slidably penetrates the second opening 12. Thus, the piston rod 2 is slidable relative to the valve seat 1, so that the plug body 21 can open or close the first opening 11.

[0045] The breathable membrane 22 is arranged at the upper end of the plug body 21, and is used to close one end of the channel 23. Specifically, the breathable membrane 22 can realize the waterproof function, and the gas inside the battery pack and the gas outside the battery pack can also be exchanged through the breathable membrane 22, and the gas can flow from the side with high pressure to the side with low pressure. For example, when the air pressure in the channel 23 is greater than the external air pressure, the gas in the channel 23 can flow to the outside through the breathable membrane 22, that is, the gas is discharged to the outside. When the air pressure in the channel 23 is lower than the external air pressure, the external gas can flow into the battery pack through the breathable membrane 22, thereby achieving a balance between the internal and external air pressures. In this state, the explosion-proof valve 100 can be used as a breathing valve.

[0046] When the pressure inside the battery pack is much greater than the ambient pressure or the internal pressure reaches the explosion value set by the explosion-proof valve 100, the explosion-proof valve 100 can be in an explosion-proof working state. At this time, the gas pressure inside the battery pack will push open the piston rod 2 of the explosion-proof valve 100, causing the piston rod 2 to slide away from the first port 11 to open the first port 11, so that the gas inside the battery pack can be directly exchanged with the outside world to achieve rapid gas discharge, thereby quickly reducing the internal pressure of the battery pack and preventing the battery pack from exploding. When the pressure inside the battery pack drops below the explosion value set by the explosion-proof valve 100, the piston rod 2 can move toward the first port 11, and the plug body 21 recloses the first port 11 to return to the initial position of the piston rod 2.

[0047] The piston rod 2 is detachably connected to the valve seat 1. For example, the piston rod 2 and the valve seat 1 can be detachably connected by fastener connection, clamping, magnetic attraction, etc.

[0048] The piston rod 2 has a first position and a second position, wherein in the first position, the piston rod 2 is connected to the valve seat 1, and in the second position, the piston rod 2 is disconnected from the valve seat 1. Specifically, when the piston rod 2 is in the first position, the pressure inside the battery pack is reduced to below the explosion value set by the explosion-proof valve 100, and the piston rod 2 is used as a breathing valve. When the piston rod 2 is in the second position, the battery pack has thermal runaway, and the piston rod 2 is disconnected from the valve seat 1.

[0049] Therefore, when the battery pack experiences thermal runaway, the piston rod 2 can be removed so that the battery pack can be directly connected to the outside world through the valve seat 1, and the fire extinguishing material can be injected into the battery pack through the valve seat 1, which can delay the spread of heat in the battery pack and avoid burning of the entire vehicle, which is beneficial to improving the safety of the battery pack and also can buy time for rescue.

[0050] According to the explosion-proof valve 100 of the embodiment of the present application, by making the piston rod 2 detachably connected to the valve seat 1, and making the rod body 26 of the piston rod 2 slidably penetrate the second opening 12 of the valve seat 1, when the battery pack has thermal runaway, the piston rod 2 can be moved in a direction away from the first opening 11, so that the piston rod 2 is separated from the valve seat 1, and the plug body 21 of the piston rod 2 can open the first opening 11, so that the battery pack can be connected to the outside through the valve seat 1, and the rescue personnel can inject the fire extinguishing material into the battery pack through the valve seat 1, which can delay the heat spread in the battery pack, thereby buying rescue time for the vehicle, and thus helping to improve the safety of the battery pack. At the same time, there is no need to lift the vehicle, which is conducive to reducing the risk of rescue, and it will not destroy the overall insulation of the battery pack, so as to avoid secondary harm to the rescue personnel. In addition, it can avoid setting up additional components, which is conducive to reducing the manufacturing cost of the battery pack.

[0051] Please continue reading Figure 1 and Figure 2 In some embodiments, the explosion-proof valve 100 may further include an elastic member 3 and a guide sleeve 24. The guide sleeve 24 is sleeved on the rod body 26. Specifically, when the piston rod 2 is in the first position, the guide sleeve 24 is arranged at the end of the rod body 26 away from the plug body 21, and the guide sleeve 24 can guide the sliding of the rod body 26. When the piston rod 2 is in the second position, the guide sleeve 24 is disconnected from the rod body 26, so that the piston rod 2 is disconnected from the valve seat 1.

[0052] The elastic member 3 is connected between the valve seat 1 and the guide sleeve 24. Specifically, one end of the elastic member 3 is connected to the valve seat 1, and the other end is connected to the guide sleeve 24. By setting the elastic member 3, when the pressure inside the battery pack drops below the burst value set by the explosion-proof valve 100, the piston rod 2 can be directly driven back to the initial position. When the pressure inside the battery pack is much greater than the ambient pressure or the internal pressure reaches the burst value set by the explosion-proof valve 100, the movement of the piston rod 2 can be restricted, the structure is simple, and it is conducive to reducing the manufacturing cost of the explosion-proof valve 100.

[0053] Exemplarily, the elastic member 3 may be a spring, and the elastic member 3 may be sleeved on the rod body 26 .

[0054] The rod body 26 is detachably connected to the guide sleeve 24. The rod body 26 and the guide sleeve 24 can be detachably connected by means of snap connection, fastener connection, magnetic attraction, etc. Thus, it is convenient to disassemble the piston rod 2, which is beneficial to improve the safety of the battery pack. At the same time, it is also convenient to install the explosion-proof valve 100.

[0055] See also Figure 4 and Figure 5 , Figure 4 A schematic diagram of an explosion-proof valve in a first position provided in some embodiments of the present application, Figure 5 Schematic diagram of the explosion-proof valve in the second position provided for some embodiments of the present application. In some embodiments, the explosion-proof valve 100 may further include a locking member 25. The locking member 25 is disposed at the end of the rod body 26 away from the plug body 21. The guide sleeve 24 may have a snap-fitting member, and in the first position, the locking member 25 is snap-fitted with the snap-fitting member. In the second position, the locking member 25 is disengaged from the snap-fitting member. Specifically, when the piston rod 2 is in the first position, the pressure inside the battery pack is reduced to below the explosion value set by the explosion-proof valve 100, and the piston rod 2 is used as a breathing valve. When the piston rod 2 is in the second position, the locking member 25 is disengaged from the snap-fitting member, causing the piston rod 2 to be disengaged from the valve seat 1.

[0056] Therefore, by providing the locking member 25 matched with the clamping member of the guide sleeve 24, the change to the original structure of the piston rod 2 can be reduced, which is conducive to reducing the manufacturing cost of the explosion-proof valve 100. At the same time, it is also convenient to assemble and replace the locking member 25, which is conducive to improving the production efficiency of the explosion-proof valve 100.

[0057] Please continue reading Figure 4 and Figure 5 In some embodiments, the clamping member is a clamping hole 241 formed on the guide sleeve 24. The rod body 26 is rotatably provided with the clamping hole 241. Figure 4 As shown, in the first position, a part of the locking member 25 intersects with the clamping hole 241 and abuts against the guide sleeve 24. Specifically, the clamping hole 241 can be a special-shaped hole, and the cross section of the locking member 25 is a shape that matches the special-shaped hole. When the piston rod 2 is in the first position, the positive projection of the locking member 25 on the plane where the guide sleeve 24 is located overlaps with the special-shaped hole, and a part of the locking member 25 abuts against the guide sleeve 24, so that the position of the locking member 25 can be limited to prevent the piston rod 2 from being out of engagement with the valve seat 1.

[0058] like Figure 5 As shown, in the second position, the locking member 25 overlaps with the clamping hole 241 to pass through and disengage from the clamping hole 241. Specifically, when the piston rod 2 needs to be changed to the second position, the piston rod 2 can be rotated by a preset angle (for example, 90°) so that the positive projection of the locking member 25 on the plane where the guide sleeve 24 is located is located within the outer contour of the clamping hole 241, and the locking member 25 can pass through the clamping hole 241, so that the piston rod 2 and the valve seat 1 can be disengaged.

[0059] Therefore, the locking member 25 is easy to match with the guide sleeve 24, and the structure is simple, which is conducive to reducing the manufacturing cost of the explosion-proof valve 100. At the same time, it is also conducive to reducing the difficulty of removing the piston rod 2, thereby reducing the difficulty of rescuing the battery pack.

[0060] See also Figure 6 and Figure 7 , Figure 6 Schematic diagram of an explosion-proof valve in a first position provided in some other embodiments of the present application, Figure 7 Schematic diagram of the explosion-proof valve in the second position provided in some other embodiments of the present application. In some embodiments, the rod body 26 and the guide sleeve 24 can be connected by threads. Thus, it is easy to realize the detachable connection between the rod body 26 and the guide sleeve 24, and the connection method is simple, which is conducive to reducing the manufacturing cost of the explosion-proof valve 100.

[0061] Please continue reading Figure 6 and Figure 7In some embodiments, the explosion-proof valve 100 may further include a sheath 4. The sheath 4 is connected to the valve seat 1. The sheath 4 may have a protection space. A guide protrusion 41 may be provided in the protection space, and the guide protrusion 41 extends along the height direction of the explosion-proof valve 100. The guide sleeve 24 has a guide groove, and the guide protrusion 41 cooperates with the guide groove. Exemplarily, a plurality of guide protrusions 41 may be provided in the protection space, and a plurality of guide grooves cooperating with the guide protrusion 41 may be provided on the guide sleeve 24.

[0062] Thus, the components in the protection space can be protected, which is beneficial to improving the service life of the explosion-proof valve 100. At the same time, the cooperation between the guide protrusion 41 and the guide groove enables the guide sleeve 24 to better achieve the guiding function, which is beneficial to improving the reliability of the explosion-proof valve 100.

[0063] For example, a plurality of guide protrusions 41 may be provided in the protection space, and a plurality of guide grooves matching with the guide protrusions 41 may be provided on the guide sleeve 24. Thus, the guiding effect of the guide sleeve 24 can be better ensured.

[0064] Please continue reading Figure 6-Figure 8 , Figure 8 A top view of an explosion-proof valve provided for some embodiments of the present application. In some embodiments, the explosion-proof valve 100 may further include a cover body 5. The cover body 5 is connected to the end of the plug body 21 away from the rod body 26. A plurality of grooves 52 may be provided on the rod body 26. The plurality of grooves 52 are spaced apart in the circumferential direction of the cover body 5. Thus, by providing a protrusion on the sleeve so that the protrusion cooperates with the groove 52, the protrusion can be snapped into the groove 52 during use, and the cover body 5 can be rotated by the sleeve, thereby driving the entire piston rod 2 to rotate, thereby realizing the removal of the piston rod 2, thereby reducing the difficulty of disassembly, and further facilitating the improvement of the safety of the battery pack.

[0065] Please continue reading Figure 4 and Figure 5 In some embodiments, the groove 52 is located at the edge of the cover 5. This arrangement facilitates processing of the cover 5 and also facilitates the force of the cover 5, thereby reducing the difficulty of disassembling the piston rod 2.

[0066] It should be noted that the groove 52 may also be located at other positions of the cover body 5, such as the side wall, upper end surface, etc. of the cover body 5, and the present application does not impose any limitation on this.

[0067] Please continue reading Figure 4-Figure 8 In some embodiments, the cover 5 is detachably connected to the plug 21. For example, the cover 5 and the plug 21 can be detachably connected by a snap connection, which is convenient for reducing the maintenance cost of the explosion-proof valve 100.

[0068] The side wall of the cover body 5 may be provided with a vent hole 51, which is connected to the breathable membrane 22. This arrangement can prevent the cover body 5 from affecting the exchange of gas between the battery pack and the outside air through the breathable membrane 22.

[0069] Please continue reading Figure 6-Figure 8 Please continue reading Figure 4 and Figure 5 In some embodiments, an annular groove is provided on the valve seat 1. The sealing ring 6 is provided in the annular groove, and the sealing ring 6 is used to abut against the battery pack housing. This is conducive to improving the sealing performance of the connection between the explosion-proof valve 100 and the battery pack.

[0070] The battery pack according to the embodiment of the present application is described below.

[0071] The battery pack provided in the embodiment of the present application includes an explosion-proof valve 100. Thus, the battery pack can be connected to the outside through the valve seat 1, thereby buying rescue time for the vehicle, thereby facilitating improving the safety of the battery pack.

[0072] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An explosion-proof valve, applied to a battery pack, characterized in that: The explosion-proof valve comprises: A valve seat, wherein the valve seat is provided with a first port and a second port, wherein the first port and the second port are in communication; A piston rod, the piston rod is detachably connected to the valve seat and has a first position and a second position, the piston rod comprises a plug body and a rod body, the plug body is located at the first opening and is used to close the first opening, the rod body is connected to one end of the plug body and is slidably disposed through the second opening; Wherein, in the first position, the piston rod is connected to the valve seat; in the second position, the piston rod is disconnected from the valve seat to open the first port.

2. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof valve further comprises an elastic member and a guide sleeve, wherein the guide sleeve is sleeved on the rod body, and the elastic member is connected between the valve seat and the guide sleeve.

3. The explosion-proof valve according to claim 2, characterized in that: The explosion-proof valve also includes a locking piece, which is arranged at one end of the rod body away from the plug body. The guide sleeve has a clamping piece. In the first position, the locking piece is clamped and matched with the clamping piece. In the second position, the locking piece is disengaged from the clamping piece.

4. The explosion-proof valve according to claim 3, characterized in that: The clamping piece is a clamping hole opened on the guide sleeve, and the rod body is rotatably provided with the clamping hole. In the first position, a part of the locking piece intersects with the clamping hole and abuts against the guide sleeve. In the second position, the locking piece overlaps with the clamping hole to pass through and disengage from the clamping hole.

5. The explosion-proof valve according to claim 2, characterized in that: The rod body is connected to the guide sleeve via threads.

6. The explosion-proof valve according to claim 2, characterized in that: The explosion-proof valve also includes a sleeve, which is connected to the valve seat. The sleeve has a protection space, in which a guide protrusion is arranged. The guide protrusion extends along the height direction of the explosion-proof valve. The guide sleeve has a guide groove, and the guide protrusion cooperates with the guide groove.

7. The explosion-proof valve according to claim 4, characterized in that: The explosion-proof valve further comprises a cover body, which is connected to an end of the plug body away from the rod body, and a plurality of grooves are arranged on the cover body, and the plurality of grooves are spaced apart in the circumferential direction of the cover body.

8. The explosion-proof valve according to claim 7, characterized in that: The groove is located at the edge of the cover body.

9. The explosion-proof valve according to claim 7, characterized in that: The explosion-proof valve also includes a breathable membrane, the piston rod has a channel, the channel runs through the piston rod, the breathable membrane is arranged at the upper end of the plug body, and is used to close one end of the channel, the cover body is detachably connected to the plug body, and a vent is provided on the side wall of the cover body, and the vent is connected to the breathable membrane.

10. A battery pack, characterized in that: The battery pack comprises an explosion-proof valve as claimed in any one of claims 1 to 9.

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