Explosion-proof valve and battery

Abstract

The utility model discloses a kind of explosion-proof valve and battery, wherein explosion-proof valve includes valve seat and pressure relief assembly, valve seat has first side and second side, first side is provided with mounting groove, the groove bottom of mounting groove is provided with mounting hole and multiple exhaust holes;Pressure relief assembly includes valve body, valve body includes main part and connecting part, main part is inserted in mounting groove, part connecting part is set to inside battery through mounting hole, connecting part is connected with second side by elastic member, valve body is provided with air pressure balance passage, air pressure balance passage communicates inside battery and outside battery, waterproof air-permeable membrane is set at air pressure balance passage place.The utility model discloses explosion-proof valve by elastic member connects second side and connecting part, so that inside battery air pressure can pass through exhaust hole to push the interval between main part and the groove bottom of mounting groove, so that the gas in inside battery can be discharged in time, improve the use safety and recycling of explosion-proof valve.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an explosion-proof valve and a battery. Background Technology

[0002] A battery is a container filled with an electrolyte solution and metal electrodes to generate an electric current; it is a device that converts chemical energy into electrical energy. During this conversion, gases are produced or consumed, causing changes in the internal pressure of the battery. Similarly, increases or decreases in the internal temperature also affect the internal pressure. An imbalance in internal pressure can severely impact the battery's normal operation; therefore, it is necessary to regulate the internal pressure of the battery.

[0003] Currently, explosion-proof valves are typically installed on the battery casing, with a waterproof and breathable membrane to allow gas circulation between the inside and outside of the battery, thereby balancing the internal and external pressures. However, when the battery experiences abnormal conditions such as short circuits, overcharging, or over-discharging, the internal reaction produces a large amount of gas, causing a sharp increase in internal pressure that can trigger the explosion-proof valve to rupture, releasing the gas and relieving pressure. This can render the explosion-proof valve unusable, and may even lead to battery failure or explosion, resulting in poor practicality and safety. Utility Model Content

[0004] The purpose of this utility model is to provide an explosion-proof valve and battery with a simple structure, which can effectively balance the internal and external air pressure of the battery, and can also release pressure in time when the internal air pressure of the battery rises sharply, thus ensuring the safety of the explosion-proof valve and battery.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, an explosion-proof valve is provided, comprising a valve seat and a pressure relief assembly. The valve seat has a first side facing away from the inside of the battery and a second side opposite to the first side. The first side is recessed and has a mounting groove. The bottom of the mounting groove has a mounting hole and a plurality of vent holes, which are evenly distributed around the mounting hole. The pressure relief assembly includes a valve body, an elastic element, and a waterproof and breathable membrane. The valve body includes a main body and a connecting part. The main body is inserted into the mounting groove and can move relative to the mounting groove. The connecting part protrudes from the side of the main body facing the inside of the battery. Part of the connecting portion passes through the mounting hole and is disposed inside the battery. The connecting portion is connected to the second side via the elastic member. The elastic member has a tendency to push the connecting portion so that the main body is always pressed against the bottom of the mounting groove, thereby blocking all the vent holes. The valve body is provided with a pressure balance channel, which connects the inside and outside of the battery. The waterproof and breathable membrane is disposed at the pressure balance channel. The air pressure inside the battery can also push the main body to separate from the bottom of the mounting groove, allowing the vent holes to communicate with the outside of the battery.

[0007] In one embodiment, the pressure relief assembly further includes a valve core, and the air pressure balance channel includes a first channel, a movable cavity, and a second channel connected in sequence. The waterproof and breathable membrane is disposed in the second channel. The first channel communicates with the inside of the battery, and the second channel communicates with the outside of the battery. The valve core is movably disposed in the movable cavity, and the air pressure inside the battery can push the valve core to block the connection between the second channel and the movable cavity.

[0008] In one embodiment, the length of the movable cavity extends along a first direction, and a stepped groove is recessed on the cavity wall of the movable cavity away from the inside of the battery along the first direction. The second channel is disposed at the bottom of the stepped groove, and a stepped portion is protruding from the valve core, which can be inserted into the stepped groove.

[0009] In one embodiment, the stepped groove includes a first groove and a second groove. The movable cavity has the first groove recessed on the cavity wall away from the inside of the battery along the first direction. The bottom of the first groove has the second groove recessed. The bottom of the second groove has the second channel. The stepped portion includes a first boss and a second boss. The valve core has the first boss protruding. The second boss protrudes from the first boss. The first boss can be inserted into the first groove and abut against the bottom of the first groove. The second boss can be inserted into the second groove and abut against the bottom of the second groove.

[0010] In one embodiment, the pressure relief assembly further includes a first seal, which is disposed between the valve core and the cavity wall of the movable cavity away from the battery interior; and / or,

[0011] The first sealing element is disposed between the first boss and the bottom of the first groove; and / or,

[0012] The first sealing element is provided between the second boss and the bottom of the second groove.

[0013] In one embodiment, the outer peripheral wall of the main body is recessed and provided with a third channel, through which the second channel communicates with the outside of the battery.

[0014] In one embodiment, the movable cavity is disposed within the connecting portion, the main body portion is provided with a receiving cavity, the second channel extends into the main body portion and communicates with the receiving cavity, and the outer peripheral wall of the main body portion is provided with a plurality of the third channels evenly distributed around its central axis, the third channels communicating with the receiving cavity.

[0015] In one embodiment, the outer peripheral wall of the main body abuts against the wall of the mounting groove, and the outer peripheral wall of the main body is recessed around its own central axis to form a clearance groove. A vent is provided through the groove wall of the clearance groove away from the inside of the battery, and the vent is located adjacent to the opening of the clearance groove. The third channel communicates with the bottom of the clearance groove.

[0016] In one embodiment, the pressure relief assembly further includes a second seal, which is disposed between the main body and the bottom of the mounting groove, and the second seal is disposed adjacent to the groove wall of the mounting groove; and / or,

[0017] A second sealing element is provided between the outer peripheral wall of the main body and the groove wall of the mounting groove; and / or,

[0018] The connecting part is slidably connected to the mounting hole.

[0019] Secondly, a battery is provided, including a housing and an explosion-proof valve as described above, wherein the housing is provided with an explosion-proof hole communicating with the interior of the housing, and the valve seat of the explosion-proof valve is embedded in the explosion-proof hole.

[0020] The beneficial effects of this utility model are:

[0021] This invention discloses an explosion-proof valve. Through the design of a pressure balancing channel, when there is a pressure imbalance between the inside and outside of the battery, internal gas pressure can be discharged or external gas can be introduced, thus regulating the pressure and ensuring normal battery performance. An elastic element connects the second side and the connecting part. In normal operation, the elastic element pushes the connecting part to seal the vent hole. When the internal pressure of the battery rises sharply, the internal pressure can pass through the vent hole and push the main body, allowing it to overcome the elasticity of the elastic element and separate from the bottom of the mounting groove. This allows the gas inside the battery to be discharged promptly. After the gas is discharged, the elastic element seals the vent hole, improving the safety and recyclability of the explosion-proof valve. This ensures that the battery will not experience dangerous pressure leakage or explosion due to excessive internal pressure, enhancing battery safety and lifespan. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the explosion-proof valve in one embodiment;

[0023] Figure 2 This is a cross-sectional view of the explosion-proof valve in one embodiment;

[0024] Figure 3 This is a schematic diagram of the explosion-proof valve in one embodiment.

[0025] In the picture:

[0026] 1. Valve seat; 11. First side; 12. Second side; 13. Mounting groove; 14. Mounting hole; 15. Vent hole; 2. Pressure relief assembly; 21. Valve body; 211. Main body; 2111. Third channel; 2112. Receiving cavity; 2113. Clearance groove; 2114. Vent; 212. Connecting part; 213. Air pressure balance channel; 2131. First channel; 2132. Movable cavity; 2133. Second channel; 214. Step groove; 2141. First groove; 2142. Second groove; 22. Elastic element; 23. Waterproof and breathable membrane; 24. Valve core; 25. Stepped part; 251. First boss; 252. Second boss; 26. First seal; 27. Second seal. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] like Figures 1 to 3As shown, an explosion-proof valve of this embodiment includes a valve seat 1 and a pressure relief assembly 2. The valve seat 1 has a first side 11 facing away from the inside of the battery and a second side 12 opposite to the first side 11. The first side 11 is recessed and has a mounting groove 13. The bottom of the mounting groove 13 is provided with a mounting hole 14 and a plurality of vent holes 15. The plurality of vent holes 15 are evenly distributed around the mounting hole 14. The pressure relief assembly 2 includes a valve body 21, an elastic element 22 and a waterproof and breathable membrane 23. The valve body 21 includes a main body 211 and a connecting part 212. The main body 211 is inserted into the mounting groove 13 and can move relative to the mounting groove 13. The side of the main body 211 facing the inside of the battery protrudes. A connecting part 212 is provided, and part of the connecting part 212 passes through the mounting hole 14 and is disposed inside the battery. The connecting part 212 is connected to the second side 12 through an elastic member 22. The elastic member 22 has a tendency to push the connecting part 212 so that the main body 211 is always pressed against the bottom of the mounting groove 13, so that the main body 211 blocks all the vent holes 15. The valve body 21 is provided with a pressure balance channel 213, which connects the inside of the battery and the outside of the battery. A waterproof and breathable membrane 23 is disposed at the pressure balance channel 213. The air pressure inside the battery can also push the main body 211 to separate from the bottom of the mounting groove 13, so that the vent holes 15 are connected to the outside of the battery.

[0032] It is understood that the explosion-proof valve of this utility model, through the setting of the air pressure balance channel 213, allows for the discharge of internal air pressure or the infiltration of external gas when there is an imbalance in the air pressure inside and outside the battery, thereby adjusting the air pressure balance and ensuring the normal performance of the battery. The elastic element 22 connects the second side 12 and the connecting part 212. In normal use, the elastic element 22 can push the connecting part 212 to seal the vent hole 15 of the main body 211. When the internal air pressure of the battery rises sharply, the internal air pressure can pass through the vent hole 15 to push the main body 211, allowing the main body 211 to overcome the elasticity of the elastic element 22 and separate from the bottom of the mounting groove 13. This allows the gas inside the battery to be discharged in a timely manner. After the gas inside the battery is discharged, the elastic element 22 can seal the vent hole 15 of the main body 211, improving the safety and recyclability of the explosion-proof valve, ensuring that the battery will not experience dangerous pressure leakage or explosion due to excessive internal pressure, and enhancing the safety and service life of the battery.

[0033] Specifically, during daily battery use, if the internal air pressure is slightly higher than the external air pressure, some of the gas inside the battery is discharged to the outside through the waterproof and breathable membrane 23 via the air pressure balance channel 213, thus achieving air pressure balance between the inside and outside of the battery. Alternatively, when the internal air pressure is lower than the external air pressure, gas from the outside of the battery can enter the battery through the air pressure balance channel 213 via the waterproof and breathable membrane 23 to balance the internal and external air pressure. When the battery experiences abnormal conditions such as short circuit, overcharge, or over-discharge, the gas flow in the air balance channel is limited. The high-pressure gas generated inside the battery can push the gap between the main body 211 and the bottom of the mounting groove 13, thereby quickly releasing pressure through multiple vent holes 15 to prevent the battery from exploding and ensure the safety of the battery structure.

[0034] Furthermore, such as Figure 2 As shown, the pressure relief assembly 2 also includes a valve core 24. The air pressure balance channel 213 includes a first channel 2131, a movable chamber 2132, and a second channel 2133 connected in sequence. A waterproof and breathable membrane 23 is disposed in the second channel 2133. The first channel 2131 communicates with the inside of the battery, and the second channel 2133 communicates with the outside of the battery. The valve core 24 is movably disposed in the movable chamber 2132. The air pressure inside the battery can push the valve core 24 to block the connection between the second channel 2133 and the movable chamber 2132. This arrangement can buffer the airflow flowing through the air pressure balance channel 213. When the air pressure outside the battery is greater than the air pressure inside the battery, the gas outside the battery can push the valve core 24 to contact the side of the movable chamber 2132 adjacent to the inside of the battery, and flow into the battery through the gap between the valve core 24 and the cavity wall of the movable chamber 2132.

[0035] Similarly, when the internal gas pressure of the battery is greater than the external gas pressure of the battery, the gas inside the battery can push the valve core 24 to move within the movable cavity 2132. In this embodiment, the movable cavity 2132 extends vertically, meaning that the gas inside the battery can push the valve core 24 to move vertically and flow from the valve core 24 to the second channel 2133 and out through the cavity wall of the receiving cavity 2112. In some cases, the internal gas pressure of the battery can even push the valve core 24 to contact the movable cavity 2132 away from the cavity wall inside the battery. When the internal pressure of the battery rises sharply, the gas inside the battery can push the valve core 24 and the movable chamber 2132 away from the internal wall of the battery to block the connection between the second channel 2133 and the movable chamber 2132. This allows the gas inside the battery to pass directly through the exhaust port 15 and push the main body 211 to move, preventing the gas pressure inside the battery from directly breaking through the waterproof and breathable membrane 23 in the second channel 2133. The valve core 24 is used to block the second channel 2133 to effectively protect the waterproof and breathable membrane 23, thereby improving the safety and recycling rate of the explosion-proof valve.

[0036] Optionally, such as Figure 2As shown, the length of the movable cavity 2132 extends along a first direction (the first direction is vertical, i.e., the Z direction in the diagram). A stepped groove 214 is recessed on the cavity wall of the movable cavity 2132 away from the battery interior along the first direction. A second channel 2133 is located at the bottom of the stepped groove 214. A stepped portion 25 protrudes from the valve core 24 and can be inserted into the stepped groove 214. This design enhances the sealing between the valve core 24 and the movable cavity 2132, effectively protecting the sealing of the second channel 2133 when the internal air pressure of the battery increases sharply. This effectively ensures the safety of the waterproof and breathable membrane 23 and prevents damage caused by air pressure impact.

[0037] Specifically, the stepped groove 214 includes a first groove 2141 and a second groove 2142. The movable cavity 2132 has a recessed first groove 2141 on its cavity wall away from the inside of the battery along a first direction. The bottom of the first groove 2141 has a recessed second groove 2142. The bottom of the second groove 2142 has a second channel 2133. The stepped portion 25 includes a first boss 251 and a second boss 252. The valve core 24 has a protruding first boss 251 and a protruding second boss 252. The first boss 251 can be inserted into the first groove 2141 and abut against the bottom of the first groove 2141. The second boss 252 can be inserted into the second groove 2142 and abut against the bottom of the second groove 2142. The engagement of the first boss 251 with the first groove 2141 and the engagement of the second boss 252 with the second groove 2142 enhances the contact area between the valve core 24 and the movable cavity 2132, thereby improving the sealing performance of the connection between the valve core 24 and the movable cavity 2132. Of course, even when the external air pressure of the battery is greater than the internal air pressure, the valve core 24 can still be pushed to separate the stepped portion 25 from the stepped groove 214, maintaining a balance in air pressure flow. Furthermore, in addition to having two levels of bosses, the stepped portion 25 can also have three, four, or more levels; correspondingly, the stepped groove 214 can also have three, four, or more levels of stepped grooves 214, which will not be illustrated here.

[0038] Preferably, the pressure relief assembly 2 further includes a first sealing element 26, which is disposed between the valve core 24 and the cavity wall of the movable cavity 2132 away from the battery interior. This arrangement effectively ensures the sealing of the connection between the valve core 24 and the cavity wall of the movable cavity 2132 away from the battery interior when the internal pressure of the battery rises sharply, thereby effectively protecting the waterproof and breathable membrane 23 within the second channel 2133. Of course, in addition to disposing of the first sealing element 26 between the valve core 24 and the cavity wall of the movable cavity 2132 away from the battery interior, the first sealing element 26 can also be disposed between the bottom of the first boss 251 and the groove 2141, or between the second boss 252 and the bottom of the groove 2142, or both, all of which can effectively improve the sealing of the connection between the valve core 24 and the cavity wall of the movable cavity 2132. The first sealing element 26 can be a sealing ring.

[0039] In some embodiments, such as Figure 2 and Figure 3 As shown, a third channel 2111 is recessed in the outer peripheral wall of the main body 211, through which the second channel 2133 communicates with the outside of the battery. This arrangement allows the third channel 2111 to be protected by the wall of the mounting groove 13 and the side of the main body 211 away from the battery interior, enabling gas flow while preventing direct communication with the outside of the battery. This avoids the impact of insects or accidental collisions on the waterproof and breathable membrane 23.

[0040] Furthermore, the movable cavity 2132 is disposed within the connecting portion 212, and the main body portion 211 is provided with a receiving cavity 2112. The second channel 2133 extends into the main body portion 211 and communicates with the receiving cavity 2112. Multiple third channels 2111 are evenly distributed in a ring around the central axis of the outer peripheral wall of the main body portion 211, and the third channels 2111 communicate with the receiving cavity 2112. Through the arrangement of the receiving cavity 2112 and the multiple third channels 2111, the communication effect between the second channel 2133 and the outside of the battery can be effectively guaranteed.

[0041] Preferably, the second channel 2133 extends along the first direction and communicates with the bottom cavity wall of the receiving cavity 2112, and the communication port between the second channel 2133 and the receiving cavity 2112 is the first communication port. The third channel 2111 extends along the radial direction of the main body 211 and communicates with the cavity wall of the receiving cavity 2112, and the communication port between the third channel 2111 and the receiving cavity 2112 is the second communication port. The bottom cavity wall of the receiving cavity 2112 is at least partially inclined, and the inclined bottom of the receiving cavity 2112 is inclined from one end adjacent to the first communication port toward one end adjacent to the second communication port and toward the inside of the battery. This can further prevent water or impurities that accidentally enter the receiving cavity 2112 through the third channel 2111 from being directed to the periphery of the first communication port, and prevent them from flowing to the first communication port and blocking the second channel 2133.

[0042] Furthermore, the outer peripheral wall of the main body 211 abuts against the wall of the mounting groove 13. A clearance groove 2113 is recessed around the central axis of the outer peripheral wall of the main body 211. A vent 2114 is provided through the wall of the clearance groove 2113 away from the battery interior, and the vent 2114 is located adjacent to the opening of the clearance groove 2113. A third channel 2111 is recessed at the bottom of the clearance groove 2113. This design strengthens the sealing between the main body 211 and the wall of the mounting groove 13, while also allowing the third channel 2111 to communicate with the outside of the battery via the clearance groove 2113. The structure is simple. The clearance groove 2113 effectively protects the third channel 2111, preventing impurities or moisture from flowing directly into the third channel 2111 and causing blockage in the second channel 2133.

[0043] Optionally, such as Figure 2 and Figure 3 As shown, the pressure relief assembly 2 also includes a second seal 27. The second seal 27 is disposed between the main body 211 and the bottom of the mounting groove 13, and is located adjacent to the groove wall of the mounting groove 13. The second seal 27 effectively enhances the sealing performance between the main body 211 and the valve seat 1, thereby ensuring the sealing performance of the main body 211 in blocking the exhaust port 15 under the action of the elastic member 22. Of course, the second seal can be disposed not only between the main body 211 and the bottom of the mounting groove 13, but also between the outer peripheral wall of the main body and the groove wall of the mounting groove 13. The second seal 27 can be a sealing ring.

[0044] Furthermore, the connecting part 212 is slidably connected to the mounting hole 14, which can effectively improve the connection accuracy between the valve body 21 and the mounting groove 13, and also ensure the stability of the valve body 21's movement under the drive of internal air pressure and elastic element 22. In addition, in this embodiment, the elastic element 22 is a spring, which is sleeved on the outer periphery of the connecting part 212. A stop part is provided at one end of the connecting part 212 near the inside of the battery, and the spring connects the stop part to the second side surface 12.

[0045] like Figures 1 to 3 As shown, an embodiment of this utility model also provides a battery, including a housing and an explosion-proof valve as described in any of the above embodiments. The housing has an explosion-proof hole communicating with the interior of the housing, and the valve seat 1 of the explosion-proof valve is embedded in the explosion-proof hole. The second side 12 and the connecting part 212 are connected by the elastic element 22 of the explosion-proof valve, so that when the explosion-proof valve is in normal use, the elastic element 22 can push the connecting part 212 to block the exhaust hole 15 of the main body 211. When the internal gas pressure of the battery rises sharply, the internal gas pressure of the battery can pass through the exhaust hole 15 to push the main body 211, so that the main body 211 can overcome the elastic effect of the elastic element 22 and be separated from the bottom of the mounting groove 13, so that the gas inside the battery can be discharged in time. After the gas inside the battery is discharged, the action of the elastic element 22 can make the main body 211 block the exhaust hole 15, improving the safety and recyclability of the explosion-proof valve, ensuring that the battery will not experience dangerous pressure leakage or explosion due to excessive internal pressure, and enhancing the safety and service life of the battery.

[0046] Optionally, the battery also includes a third seal, which is disposed between the explosion-proof hole and the valve seat 1 to ensure the sealing of the connection between the explosion-proof valve and the housing. The third seal can be a sealing ring.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An explosion-proof valve, characterized in that, include: The valve seat has a first side facing away from the inside of the battery and a second side opposite to the first side. The first side is recessed and has a mounting groove. The bottom of the mounting groove is provided with a mounting hole and a plurality of vent holes. The plurality of vent holes are evenly distributed around the mounting hole. A pressure relief assembly includes a valve body, an elastic element, and a waterproof and breathable membrane. The valve body includes a main body and a connecting part. The main body is inserted into the mounting groove and can move relative to the mounting groove. The connecting part protrudes from the side of the main body facing the inside of the battery. Part of the connecting part passes through the mounting hole and is disposed inside the battery. The connecting part is connected to the second side via the elastic element. The elastic element has a tendency to push the connecting part so that the main body is always pressed against the bottom of the mounting groove, thereby blocking all the vent holes. The valve body is provided with a pressure balance channel that connects the inside and outside of the battery. The waterproof and breathable membrane is disposed at the pressure balance channel. The air pressure inside the battery can also push the main body to separate from the bottom of the mounting groove, allowing the vent holes to communicate with the outside of the battery.

2. The explosion-proof valve according to claim 1, characterized in that, The pressure relief assembly also includes a valve core. The air pressure balance channel includes a first channel, a movable chamber, and a second channel connected in sequence. The waterproof and breathable membrane is disposed in the second channel. The first channel communicates with the inside of the battery, and the second channel communicates with the outside of the battery. The valve core is movably disposed in the movable chamber. The air pressure inside the battery can push the valve core to block the connection between the second channel and the movable chamber.

3. The explosion-proof valve according to claim 2, characterized in that, The length of the movable cavity extends along a first direction. A stepped groove is recessed on the cavity wall of the movable cavity away from the inside of the battery along the first direction. The second channel is disposed at the bottom of the stepped groove. A stepped portion protrudes from the valve core and can be inserted into the stepped groove.

4. The explosion-proof valve according to claim 3, characterized in that, The stepped groove includes a first groove and a second groove. The movable cavity has the first groove recessed on the cavity wall away from the inside of the battery along the first direction. The bottom of the first groove has the second groove recessed. The bottom of the second groove has the second channel. The stepped portion includes a first boss and a second boss. The valve core has the first boss protruding. The second boss protrudes from the first boss. The first boss can be inserted into the first groove and abut against the bottom of the first groove. The second boss can be inserted into the second groove and abut against the bottom of the second groove.

5. The explosion-proof valve according to claim 4, characterized in that, The pressure relief assembly further includes a first seal, which is disposed between the valve core and the cavity wall of the movable chamber away from the battery interior; and / or, The first sealing element is disposed between the first boss and the bottom of the first groove; and / or, The first sealing element is provided between the second boss and the bottom of the second groove.

6. The explosion-proof valve according to any one of claims 2 to 5, characterized in that, The outer peripheral wall of the main body is recessed and a third channel is provided, through which the second channel communicates with the outside of the battery.

7. The explosion-proof valve according to claim 6, characterized in that, The movable cavity is disposed within the connecting portion, and the main body portion is provided with a receiving cavity. The second channel extends into the main body portion and communicates with the receiving cavity. Multiple third channels are evenly distributed around the outer peripheral wall of the main body portion around its central axis, and the third channels communicate with the receiving cavity.

8. The explosion-proof valve according to claim 7, characterized in that, The outer peripheral wall of the main body abuts against the wall of the mounting groove. The outer peripheral wall of the main body is recessed around its own central axis and has a relief groove. A vent is provided through the groove wall away from the inside of the battery, and the vent is located adjacent to the opening of the relief groove. The third channel connects to the bottom of the relief groove.

9. The explosion-proof valve according to any one of claims 1 to 5, characterized in that, The pressure relief assembly further includes a second seal, which is disposed between the main body and the bottom of the mounting groove, and the second seal is disposed adjacent to the groove wall of the mounting groove; and / or, A second sealing element is provided between the outer peripheral wall of the main body and the groove wall of the mounting groove; and / or, The connecting part is slidably connected to the mounting hole.

10. A battery, characterized in that, The device includes a housing and an explosion-proof valve as described in any one of claims 1 to 9, wherein the housing is provided with an explosion-proof hole communicating with the interior of the housing, and the valve seat of the explosion-proof valve is embedded in the explosion-proof hole.

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