Explosion-proof valve, battery and electric device

Abstract

The utility model discloses an anti-explosion valve, a battery and an electric device. The explosion-proof valve comprises a valve seat and a piston. The valve seat includes a valve bore. And the valve hole is used for exhausting when the explosion-proof valve releases pressure. The piston comprises a piston disc and a piston barrel. The piston disc is used for covering the valve hole to close the valve hole. The piston barrel is arranged on the side, facing the valve hole, of the piston disc. The hole wall of the valve hole guides the barrel wall of the piston barrel so that the piston barrel can move in the valve hole in the axial direction of the valve hole and drive the piston disc to move so as to open or close the valve hole. The cylinder wall of the piston cylinder comprises an open area, and when the anti-explosion valve releases pressure, gas flows into the valve hole, enters the piston cylinder and then is discharged out of the anti-explosion valve through the open area. According to the explosion-proof valve, gas directly acts on the piston disc to drive the piston barrel to axially move, the valve hole used for exhausting guides the piston barrel, a guide structure does not need to be arranged in the valve hole, the sectional area of the valve hole is larger, the exhausting efficiency is improved, meanwhile, the structure of the explosion-proof valve is simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to an explosion-proof valve, a battery, and an electrical device. Background Art

[0002] During the charging and discharging process of a battery pack, the temperature will change, resulting in a change in the air pressure inside the battery box. An explosion-proof valve is provided on the battery pack to balance the air pressure inside and outside the battery box. However, the existing explosion-proof valves have a low exhaust efficiency during exhaust, resulting in poor exhaust performance of the explosion-proof valves. Summary of the Utility Model

[0003] In view of the above problems, the present application provides an explosion-proof valve, a battery, and an electrical device to improve the exhaust efficiency of the explosion-proof valve.

[0004] In a first aspect of the present application, an explosion-proof valve is provided, which includes a valve seat and a piston. The valve seat includes a valve hole. The valve hole is used for exhausting gas when the explosion-proof valve relieves pressure. The piston includes a piston disc and a piston cylinder. The piston disc is used to cover the valve hole to close the valve hole. The piston cylinder is arranged on the side of the piston disc facing the valve hole. The hole wall of the valve hole guides the cylinder wall of the piston cylinder so that the piston cylinder moves along the axial direction of the valve hole in the valve hole and drives the piston disc to move to open or close the valve hole. The cylinder wall of the piston cylinder includes an open area. When the explosion-proof valve relieves pressure, gas flows into the valve hole and then enters the piston cylinder and is discharged from the explosion-proof valve through the open area.

[0005] The gas directly acts on the piston disc to drive the axial movement of the piston cylinder. During this process, the piston cylinder is guided by the valve hole for exhausting gas, without the need to set a guiding structure in the valve hole or a guiding rod cooperating with the guiding structure, so that the cross-sectional area of the valve hole is larger, improving the exhaust efficiency. At the same time, the structure of the explosion-proof valve is simplified, and the manufacturing cost is reduced.

[0006] In some embodiments, the end of the piston cylinder away from the piston disc is open.

[0007] With this setting, the cross-sectional area of the end of the piston cylinder away from the piston disc can be increased, enabling the air flow to more smoothly flow into the piston cylinder, thereby better discharging the gas through the open area on the cylinder wall.

[0008] In some embodiments, the open area is continuously arranged within a partial range in the circumferential direction of the piston cylinder for directional exhaust.

[0009] By specially designing the position of the open area on the cylinder wall, when the explosion-proof valve exhausts gas, the gas can be concentrated in a specific area in the circumferential direction of the explosion-proof valve when passing through the open area, realizing directional exhaust, which is convenient for the discharged high-pressure gas to avoid other components arranged around the explosion-proof valve, improving the exhaust reliability and safety of the explosion-proof valve.

[0010] In some embodiments, the cylinder wall includes a plurality of open areas. The plurality of open areas are circumferentially spaced apart.

[0011] In this solution, it is possible to achieve the directional discharge of gas at multiple positions in the circumferential direction of the explosion-proof valve, improving the diversity of the exhaust direction of the explosion-proof valve. When the installation positions of the components around the explosion-proof valve change, by adjusting the positions of the plurality of open areas, the exhaust can still preferably avoid these components, improving the reliability and safety of the explosion-proof valve in different environments.

[0012] In some embodiments, the diameter of the piston cylinder is smaller than the diameter of the piston disk. This facilitates the axial movement of the piston cylinder within the valve hole.

[0013] In some embodiments, an elastic member is further included. The elastic member is located inside the valve hole, and the first end of the elastic member is axially fixed relative to the valve hole, and the second end of the elastic member is axially movable relative to the valve hole. When the explosion-proof valve relieves pressure, the gas pushes the piston disk to move axially to open the valve hole and compress the elastic member. After the explosion-proof valve relieves pressure, the elastic member resets the piston to close the valve hole.

[0014] Adopting an elastic member can achieve the automatic opening and closing of the explosion-proof valve, improving the intelligence of the explosion-proof valve.

[0015] In some embodiments, the elastic member includes a spring. The spring is sleeved outside the piston cylinder.

[0016] Configuring the elastic member as a spring and arranging the spring between the outer wall of the piston cylinder and the inner wall of the valve hole can reduce the space occupied by the elastic member within the valve hole and improve the exhaust efficiency of the explosion-proof valve.

[0017] In some embodiments, the valve seat further includes a first limiting convex edge. The first limiting convex edge is provided on the hole wall of the valve hole. The first end of the spring abuts against the first limiting convex edge, and the first limiting convex edge limits the first end of the spring in the axial direction. Thus, the position stability of the first end of the spring in the axial direction is improved.

[0018] In some embodiments, the first limiting convex edge extends circumferentially along the inner wall of the valve hole. This can increase the contact area between the first limiting convex edge and the first end of the spring, further improving the position stability of the first end of the spring in the axial direction.

[0019] In some embodiments, the piston further includes a second limiting convex edge. The second limiting convex edge is provided at the end of the piston cylinder away from the piston disk. The second limiting convex edge extends in the circumferential direction of the piston cylinder and protrudes radially relative to the outer wall of the piston cylinder. The second end of the spring abuts against the second limiting convex edge. The second limiting convex edge limits the second end of the spring in the axial direction.

[0020] The second limiting convex edge can limit the second end of the spring, ensuring that the second end of the spring moves together with the piston without axial displacement relative to the piston, thereby ensuring that the explosion-proof valve can be automatically opened or closed according to the air pressure.

[0021] In some embodiments, the second limiting convex edge extends circumferentially around the surface of the piston cylinder for one circle.

[0022] This can increase the contact area between the second limiting convex edge and the second end of the spring, enhance the limiting effect on the second end of the spring, and to a certain extent reduce the risk of the spring separating from the second limiting convex edge when rotating.

[0023] The second aspect of the present application provides a battery, including a battery box, battery cells, and the explosion-proof valve as described above. The battery cells are arranged in the battery box, and the explosion-proof valve is arranged on the battery box.

[0024] The third aspect of the present application provides an electrical device, including the battery as described above. The battery is used to provide electrical energy.

[0025] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of a vehicle in some embodiments of the present application.

[0028] Figure 2 It is an exploded structural diagram of a battery in some embodiments of the present application.

[0029] Figure 3 It is an exploded view of an explosion-proof valve in some embodiments of the present application.

[0030] Figure 4 It is a cross-sectional view of the piston of the explosion-proof valve in some embodiments of the present application.

[0031] Figure 5 It is a cross-sectional view of the valve seat of the explosion-proof valve in some embodiments of the present application.

[0032] Figure 6It is the front view of the valve seat of the explosion-proof valve in some embodiments of the present application.

[0033] Reference numerals in the drawings: 2000, vehicle; 1000, battery; 200, battery box; 210, lower box body; 220, upper box body; 100, battery module; 1, valve seat; 11, valve hole; 12, annular convex edge; 2, piston; 21, piston disc; 22, piston cylinder; 23, second limiting convex edge; 3, elastic member; 4, inner sealing ring; 5, outer sealing ring. Detailed implementation manners

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0036] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0038] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application 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 construed as a limitation to the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0041] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0042] The electrical device in the embodiments of the present application can be a mobile device such as a vehicle, a ship, a small aircraft, etc. Taking a vehicle as an example, the vehicle in the embodiments of the present application can be a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Figure 1 A vehicle 2000 using a battery 1000 as a power source is shown. The battery 1000 is disposed inside the vehicle 2000. A drive motor is disposed inside the vehicle 2000. The drive motor is electrically connected to the battery 1000. The battery 1000 provides electrical energy for the drive motor. The drive motor is connected to the wheels through a transmission mechanism to drive the vehicle forward. Specifically, the battery 1000 can be horizontally disposed at the bottom of the vehicle 2000.

[0043] The battery 1000 in the embodiments of the present application includes at least one battery module 100. Specifically, in this embodiment, as Figure 2 shown, the battery 1000 in this embodiment includes a battery module 100 and a battery box 200 for accommodating the battery module 100. The battery box 200 has an accommodation cavity, and the battery module 100 is arranged in the accommodation cavity. In Figure 2In the illustrated embodiment, the battery box 200 includes a lower box body 210 and an upper box body 220 that are covered with each other. The upper box body 220 and the lower box body 210 jointly define a receiving space for receiving the battery module 100. Of course, in some other embodiments, the battery 1000 may further include a cover body covering the lower box body 210, and the cover body may be, for example, a plate-like structure. Of course, the shape of the battery box 200 may be various shapes, such as a cuboid, a cylinder, etc.

[0044] The explosion-proof valve is installed on the battery box. When the pressure inside the battery box exceeds the threshold value, the high-pressure gas drives the piston of the explosion-proof valve to move by pushing the guide rod inside the explosion-proof valve, and then opens the exhaust hole to release the internal pressure. In this solution, when deflating, the high-pressure gas will be blocked by the guide rod, resulting in limited exhaust efficiency.

[0045] Reference Figure 3 Referring to this, some embodiments of the present application provide an explosion-proof valve, which includes a valve seat 1 and a piston 2. The valve seat 1 includes a valve hole 11. The valve hole 11 is used for exhausting gas when the explosion-proof valve relieves pressure. The piston 2 includes a piston disk 21 and a piston cylinder 22. The piston disk 21 is used to cover the valve hole 11 to close the valve hole 11. The piston cylinder 22 is disposed on the side of the piston disk 21 facing the valve hole 11. The hole wall of the valve hole 11 guides the cylinder wall of the piston cylinder 22 so that the piston cylinder 22 moves along the axial direction X of the valve hole 11 in the valve hole 11 and drives the piston disk 21 to move to open or close the valve hole 11. Wherein, the cylinder wall of the piston cylinder 22 includes an open area. When the explosion-proof valve relieves pressure, the gas flows into the valve hole 11 and enters the piston cylinder 22 and then is discharged from the explosion-proof valve through the open area.

[0046] Specifically, the piston cylinder 22 is a hollow cylindrical structure inside, the piston cylinder 22 communicates with the valve hole 11, and the open area is an opening formed on the cylinder wall, realizing the communication between the inside and the outside of the piston cylinder 22 in the radial direction. Thus, when exhausting gas, the gas enters the valve hole 11 and flows into the piston cylinder 22, and then is discharged through the open area. When the explosion-proof valve is in the closed state, the piston disk 21 covers and seals the valve hole 11, the piston cylinder 22 is located in the valve hole 11, the open area is blocked by the hole wall of the valve hole 11, and the valve hole 11 cannot exhaust gas. When the battery box undergoes thermal runaway, the high-pressure gas acts on the piston disk 21, pushing the piston disk 21 to move axially so that the piston disk 21 moves away from the valve hole 11 and drives the piston cylinder 22 to move synchronously, causing at least a part of the piston cylinder 22 to extend out of the valve hole 11. At this time, at least a part of the open area is not blocked by the hole wall of the valve hole 11, so that the valve hole 11 can exhaust gas.

[0047] The gas directly acts on the piston disk 21 to drive the axial movement of the piston cylinder 22. During this process, the piston cylinder 22 is guided by the valve hole 11 for exhaust, without the need to provide a guiding structure within the valve hole 11 or a guiding rod that cooperates with the guiding structure. This enables a larger cross-sectional area of the valve hole 11, improving the exhaust efficiency. At the same time, the structure of the explosion-proof valve is simplified and the manufacturing cost is reduced.

[0048] In some embodiments, the piston disk 21 is in a disk shape, and the contour of the valve hole 11 is also circular. The size of the piston disk 21 is approximately equal to the size of the valve hole 11. The piston disk 21 covers one end of the valve hole 11 to close the valve hole 11. This can improve the sealing performance of the explosion-proof valve in the closed state.

[0049] In some embodiments, one end of the piston cylinder 22 away from the piston disk 21 is open. With this arrangement, the cross-sectional area of the end of the piston cylinder 22 away from the piston disk 21 can be increased, allowing the air flow to more smoothly flow into the piston cylinder 22, and thus better exhausting the gas through the open area on the cylinder wall.

[0050] Reference Figure 3 and 4 In some embodiments, the open area is continuously arranged within a partial range in the circumferential direction of the piston cylinder 22 for directional exhaust. Specifically, by specially designing the position of the open area on the cylinder wall, when the explosion-proof valve exhausts gas, the gas can be concentrated in a specific area in the circumferential direction of the explosion-proof valve when passing through the open area, achieving directional exhaust, which is convenient for the discharged high-pressure gas to avoid other components arranged around the explosion-proof valve, improving the exhaust reliability and safety of the explosion-proof valve.

[0051] In some embodiments, the cylinder wall includes a plurality of open areas, and the plurality of open areas are arranged at intervals in the circumferential direction. In this solution, the directional discharge of gas at multiple positions in the circumferential direction of the explosion-proof valve can be achieved, improving the diversity of the exhaust direction of the explosion-proof valve. When the installation positions of the components around the explosion-proof valve change, by adjusting the positions of the plurality of open areas, the exhaust can still preferably avoid these components, improving the reliability and safety of the explosion-proof valve in different environments.

[0052] In some embodiments, the diameter of the piston cylinder 22 is smaller than the diameter of the piston disk. Specifically, the diameter of the piston cylinder 22 is slightly smaller than the diameter of the valve hole 11, which facilitates the axial movement of the piston cylinder 22 within the valve hole 11 along the axial direction X.

[0053] It should be understood that since the diameter of the piston cylinder 22 is slightly smaller than that of the valve hole 11, the outer cylinder wall of the piston cylinder 22 is almost in close contact with the hole wall of the valve hole 11. During exhaust, after the gas enters the valve hole 11 from the side of the valve seat 1 facing away from the piston 2, it can enter the piston cylinder 22 concentratedly, reducing the gas from entering the gap between the piston cylinder 22 and the hole wall of the valve hole 11, thereby enhancing the exhaust efficiency.

[0054] In some embodiments, the explosion-proof valve further includes an elastic member 3. The elastic member 3 is located inside the valve hole 11, and the first end of the elastic member is fixed relative to the valve hole 11 in the axial direction X. The second end of the elastic member is movable relative to the valve hole 11 in the axial direction X. When the explosion-proof valve relieves pressure, the gas pushes the piston disk 21 to move along the axial direction X to open the valve hole 11 and compress the elastic member 3. After the explosion-proof valve relieves pressure, the elastic member 3 resets the piston 2 to close the valve hole 11.

[0055] Specifically, the elastic member 3 extends in the axial direction X. The first end of the elastic member 3 refers to the end close to the piston disk 21, and the second end of the elastic member 3 refers to the end close to the battery box. The second end of the elastic member 3 remains relatively fixed with the piston 2 in the axial direction X. In other words, when the piston 2 moves, the second end of the elastic member 3 moves synchronously to displace relative to the first end of the elastic member 3, thereby changing the elastic force of the elastic member 3. When the battery box does not undergo thermal runaway, the elastic member 3 exerts an axial force on the piston 2 so that the piston disk 21 covers the valve hole 11 more firmly, realizing the closure of the valve hole 11. When the battery box undergoes thermal runaway, resulting in the gas pressure being greater than the force of the elastic member 3, the gas pushes the piston disk 21 to move axially and overcomes the force of the elastic member 3, causing the piston disk 21 to move away from the valve hole 11, thereby realizing exhaust. During the pressure relief process, since the elastic member 3 is compressed, the force exerted by the elastic member 3 on the piston 2 becomes larger. When the air pressure is less than the force of the elastic member 3, the elastic member 3 resets the piston 2, and the piston disk 21 covers the valve hole 11 firmly again, closing the explosion-proof valve.

[0056] In summary, the use of the elastic member 3 can realize the automatic opening and closing of the explosion-proof valve, improving the intelligence of the explosion-proof valve.

[0057] In some embodiments, the elastic member 3 includes a spring. The spring is sleeved outside the piston cylinder 22.

[0058] Specifically, the elastic member 3 is configured as a spring and is arranged between the outer cylinder wall of the piston cylinder 22 and the inner wall of the valve hole 11, which can reduce the space occupied by the elastic member 3 in the valve hole 11 and improve the exhaust efficiency of the explosion-proof valve.

[0059] In some embodiments, the valve seat 1 further includes a first limiting convex edge (not shown in the figure). The first limiting convex edge is provided on the inner wall of the valve hole 11. The first end of the spring abuts against the first limiting convex edge. The first limiting convex edge limits the first end of the spring in the axial direction X.

[0060] The first limiting convex edge protrudes radially with respect to the inner wall of the valve hole 11, so as to better abut against the first end of the spring and improve the axial position stability of the first end of the spring.

[0061] In some embodiments, the first limiting convex edge extends circumferentially along the inner wall of the valve hole 11. This can increase the contact area between the first limiting convex edge and the first end of the spring, and further improve the axial position stability of the first end of the spring.

[0062] In some embodiments, the first limiting convex edge is configured to extend circumferentially for one circle to further enhance the limiting effect on the first end of the spring.

[0063] Reference Figure 4 Referring to, in some embodiments, the piston 2 further includes a second limiting convex edge 23. The second limiting convex edge 23 is provided at one end of the piston cylinder 22 away from the piston disc 21. The second limiting convex edge 23 extends along the circumferential direction of the piston cylinder 22 and protrudes radially with respect to the outer wall of the piston cylinder 22. The second end of the spring abuts against the second limiting convex edge 23. The second limiting convex edge 23 limits the second end of the spring in the axial direction X.

[0064] The second limiting convex edge 23 can limit the second end of the spring, ensuring that the second end of the spring moves with the piston 2 together without axial displacement relative to the piston 2, so as to ensure that the explosion-proof valve can be automatically opened or closed according to the magnitude of the air pressure.

[0065] In some embodiments, the second limiting convex edge 23 extends circumferentially for one circle along the surface of the piston cylinder 22. This can increase the contact area between the second limiting convex edge 23 and the second end of the spring, enhance the limiting effect on the second end of the spring, and can also reduce the risk of separation between the spring and the second limiting convex edge 23 when the spring rotates to a certain extent.

[0066] Reference Figure 6 Referring to, in some embodiments, the valve seat 1 further includes an annular convex edge 12. The annular convex edge 12 is provided on the end face of the valve seat 1 facing away from the battery box. The annular convex edge 12 protrudes in a direction perpendicular to the valve seat 1. The annular convex edge 12 defines a circular area on the valve seat 1. The valve hole 11 is located within this circular area. The diameter of this circular area is approximately equal to the diameter of the piston disc 21. When the explosion-proof valve is closed, the piston disc 21 sinks into the circular area defined by the annular convex edge 12, thereby enhancing the sealing performance of the explosion-proof valve in the closed state.

[0067] In some embodiments, the explosion-proof valve further includes an inner sealing ring 4. The inner sealing ring 4 is located in the valve hole 11, and in the axial direction, the inner sealing ring 4 is closer to the piston disk 21 relative to the first end of the spring to further enhance the sealing performance of the explosion-proof valve in the closed state.

[0068] In some embodiments, the explosion-proof valve further includes an outer sealing ring 5. The outer sealing ring 5 is disposed on the end face of the valve seat 1 facing the battery box. After the explosion-proof valve is installed on the battery box 200, the outer sealing ring 5 is clamped between the surface of the valve seat 1 and the battery box 200, reducing the gap between the valve seat 1 and the battery box 200, improving the sealing performance of the explosion-proof valve, ensuring that when deflating, the high-pressure gas is discharged through the valve hole as much as possible, and also ensuring the sensitivity of the explosion-proof valve to open or close.

[0069] Some embodiments of the present application further provide a battery, including a battery box 200, battery cells, and the explosion-proof valve as described above. The battery cells are disposed in the battery box 200, and the explosion-proof valve is disposed on the battery box 200.

[0070] The present application further provides an electrical device, including the battery 1000 as described above, and the battery 1000 is used to provide electrical energy.

[0071] The following combines Figures 3 to 6 , and details the explosion-proof valve of a specific embodiment of the present application.

[0072] The explosion-proof valve includes a valve seat 1, a piston 2, a spring, an inner sealing ring 4, and an outer sealing ring 5.

[0073] The valve seat 1 includes an annular convex edge 12 and a valve hole 11. The annular convex edge 12 is disposed on the end face of the valve seat 1 facing away from the battery box and protrudes in the axial direction X. The annular convex edge 12 defines a circular area on the valve seat 1, and the valve hole 11 is located in this circular area and penetrates the valve seat 1. The inner sealing ring 4 is disposed in the valve hole 11 to enhance the sealing performance of the explosion-proof valve in the closed state. The outer sealing ring 5 is disposed on the end face of the valve seat 1 facing the battery box. After the explosion-proof valve is installed on the battery box 200, the outer sealing ring 5 is clamped between the surface of the valve seat 1 and the battery box 200.

[0074] The piston 2 includes a piston disk 21 and a piston cylinder 22. The size and contour of the piston disk 21 are substantially the same as those of the valve hole 11 so that the piston disk 21 can cover and seal the valve hole 11. The piston cylinder 22 is disposed on the side of the piston disk 21 facing the valve hole 11. The piston cylinder 22 is a hollow cylindrical structure, and the cylinder wall of the piston cylinder 22 includes an open area, and the open area is continuously disposed within a partial range in the circumferential direction of the piston cylinder 22.

[0075] The valve seat 1 further includes a first limiting convex edge provided on the hole wall of the valve hole 11. The first limiting convex edge protrudes in the radial direction relative to the hole wall of the valve hole 11, and the first limiting convex edge extends in a circle in the circumferential direction of the valve hole 11. One end of the piston cylinder 22 away from the piston disk 21 is provided with a second limiting convex edge 23. The second limiting convex edge 23 protrudes in the radial direction relative to the surface of the piston cylinder 22, and the second limiting convex edge 23 extends in a circle in the circumferential direction of the piston cylinder 22. The spring is sleeved outside the piston cylinder 22. The first end of the spring abuts against the first limiting convex edge, so that the first end of the spring is relatively fixed to the valve hole 11 in the axial direction X. The second end of the spring abuts against the second limiting convex edge 23, so that the second end of the spring is relatively fixed to the piston 2 in the axial direction X. Thus, the second end of the spring is synchronously moved when the piston 2 moves.

[0076] When the battery box does not have a thermal runaway, the spring is in a compressed state and applies an axial force close to the battery box to the piston 2, so that the piston disk 21 tightly covers the valve hole 11, thereby closing the explosion-proof valve. At this time, the piston cylinder 22 is located in the valve hole 11, and the open area on the cylinder wall of the piston cylinder 22 is blocked by the hole wall of the valve hole 11, and the battery box is not communicated with the outside. When the battery box has a thermal runaway, the air pressure in the battery box increases. Since the piston cylinder 22 is hollow and communicated with the valve hole 11, the high-pressure gas directly acts on the piston disk 21, pushing the piston disk 21 to move axially to further compress the spring. At this time, the open area of the piston cylinder 22 extends out of the valve hole 11 and is not blocked by the hole wall of the valve hole 11, and the battery box is communicated with the outside gas. The gas in the battery box is discharged through the valve hole 11, the piston cylinder 22 and the open area, completing the exhaust. After the exhaust, the spring resets the piston 2, so that the piston disk 21 closes the valve hole 11 again, realizing the automatic opening and automatic closing of the explosion-proof valve.

[0077] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An explosion-proof valve, characterized in that: include: A valve seat (1) comprising a valve hole (11), wherein the valve hole (11) is used to exhaust air when the explosion-proof valve releases pressure; and The piston (2) comprises a piston disc (21) and a piston cylinder (22), wherein the piston disc (21) is used to cover the valve hole (11) to close the valve hole (11), and the piston cylinder (22) is arranged on a side of the piston disc (21) facing the valve hole (11), the outer cylinder wall of the piston cylinder (22) is in contact with the inner wall of the valve hole (11), and the hole wall of the valve hole (11) guides the cylinder wall of the piston cylinder (22) so that the piston cylinder (22) moves in the valve hole (11) along the axial direction (X) of the valve hole (11) and drives the piston disc (21) to move so as to open or close the valve hole (11). The cylinder wall of the piston cylinder (22) includes an open area, and when the explosion-proof valve releases pressure, gas flows into the valve hole (11) and enters the piston cylinder (22), and then is discharged from the explosion-proof valve through the open area.

2. The explosion-proof valve according to claim 1, characterized in that: One end of the piston cylinder (22) away from the piston plate (21) is open.

3. The explosion-proof valve according to claim 1, characterized in that: The open area is continuously arranged over a partial range of the piston cylinder (22) in the circumferential direction for directional exhaust.

4. The explosion-proof valve according to claim 1, characterized in that: The cylinder wall includes a plurality of open areas, and the plurality of open areas are spaced apart in a circumferential direction.

5. The explosion-proof valve according to claim 1, characterized in that: The diameter of the piston cylinder (22) is smaller than the diameter of the piston disc.

6. The explosion-proof valve according to any one of claims 1 to 5, characterized in that: The invention also comprises an elastic member (3), wherein the elastic member (3) is located inside the valve hole (11), and a first end of the elastic member is fixed relative to the valve hole in the axial direction, and a second end of the elastic member is movable relative to the valve hole in the axial direction. When the explosion-proof valve releases pressure, gas pushes the piston disc (21) to move along the axial direction (X) to open the valve hole (11) and compress the elastic member (3). After the explosion-proof valve releases pressure, the elastic member (3) resets the piston (2) to close the valve hole (11).

7. The explosion-proof valve according to claim 6, characterized in that: The elastic member (3) comprises a spring, and the spring is sleeved on the outside of the piston cylinder (22).

8. The explosion-proof valve according to claim 7, characterized in that: The valve seat (1) further comprises a first limiting convex edge, the first limiting convex edge being arranged on the hole wall of the valve hole (11), the first end of the spring abutting against the first limiting convex edge, and the first limiting convex edge limiting the first end of the spring in the axial direction (X).

9. The explosion-proof valve according to claim 8, characterized in that: The first limiting convex edge extends circumferentially along the inner wall of the valve hole (11).

10. The explosion-proof valve according to claim 7, characterized in that: The piston (2) further comprises a second limiting convex edge (23), the second limiting convex edge (23) being arranged at an end of the piston cylinder (22) away from the piston disc (21), the second limiting convex edge (23) extending along the circumferential direction of the piston cylinder (22) and protruding in the radial direction relative to the outer cylinder wall of the piston cylinder (22), the second end of the spring abutting against the second limiting convex edge (23), and the second limiting convex edge (23) limiting the second end of the spring in the axial direction (X).

11. The explosion-proof valve according to claim 10, characterized in that: The second limiting convex edge (23) extends along the circumference of the surface of the piston cylinder (22).

12. A battery, characterized in that: It comprises a battery box (200), a battery cell, and an explosion-proof valve according to any one of claims 1 to 11, wherein the battery cell is arranged in the battery box (200), and the explosion-proof valve is arranged on the battery box (200).

13. An electrical device, characterized in that: The battery (1000) according to claim 12 is used to provide electrical energy.

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