Explosion-proof valve, battery pack and vehicle

Abstract

The utility model discloses an anti-explosion valve, a battery pack and a vehicle, and relates to the technical field of safety valves, the anti-explosion valve comprises a valve body, a movable part and a magnetic coupling mechanism; an exhaust channel is arranged in the valve body; the movable part is movably arranged in the exhaust channel so as to have a closed state for blocking the exhaust channel and a pressure relief state for conducting the exhaust channel; the magnetic coupling mechanism comprises a first coupling part arranged on the valve body and a second coupling part arranged on the movable part, the first coupling part and the second coupling part are opposite in the moving direction of the movable part in a spaced mode, at least one of the first coupling part and the second coupling part is configured to be an electromagnet, and the electromagnet is provided with a magnetic conduction part on the opposite sides of the first coupling part and the second coupling part. When the electromagnet is powered on, the magnetic coupling mechanism can drive the movable part to be switched from the closed state to the pressure relief state. The technical scheme provided by the utility model aims to improve the use reliability of the explosion-proof valve and reduce the damage probability of the battery pack in a manner of actively opening the explosion-proof valve.

Description

Explosion-proof valves, battery packs and vehicles Technical Field

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

[0002] Batteries may encounter various abnormal situations during use, such as overcharging, over-discharging, short circuits, internal short circuits, and high-temperature environments. These abnormal conditions can lead to increased internal pressure, resulting in serious safety accidents such as battery bulging, leakage, or even explosion. In related technologies, explosion-proof valves typically utilize the significant pressure difference between the inside and outside of the battery to open and release gas from the battery pack. However, when the high-temperature gas inside the battery pack impacts the explosion-proof valve to the open state, the battery pack has already suffered some damage. Summary of the Invention

[0003] The main purpose of this invention is to propose an explosion-proof valve, a battery pack, and a vehicle, aiming to improve the reliability of the explosion-proof valve by actively opening it.

[0004] To achieve the above objectives, the present invention proposes an explosion-proof valve, the explosion-proof valve comprising:

[0005] The valve body has an exhaust passage.

[0006] A movable component, movably disposed in the exhaust passage, to have a closed state that blocks the exhaust passage and a depressurized state that opens the exhaust passage; and

[0007] A magnetic coupling mechanism includes a first coupling portion disposed on the valve body and a second coupling portion disposed on the movable member. The first coupling portion and the second coupling portion are spaced apart from each other in the direction of movement of the movable member, and at least one of them is configured as an electromagnet. On the opposite side of the first coupling portion and the second coupling portion, the electromagnet is provided with a magnetic conductive element.

[0008] When the electromagnet is energized, the magnetic coupling mechanism can drive the movable part to switch from the closed state to the depressurized state.

[0009] In one embodiment, the first coupling part is configured as the electromagnet, and the second coupling part is configured as a ferromagnet.

[0010] In one embodiment, the movable member passes through the first coupling portion, with one end used to block the exhaust passage and the other end provided with the second coupling portion.

[0011] In one embodiment, the valve body further includes a vent port communicating with the exhaust channel and a receiving cavity communicating with the vent port. The magnetic coupling mechanism is located in the receiving cavity. The movable component includes a guide rod and a cover. The cover is movably disposed at the vent port. The guide rod is connected to the cover from the receiving cavity. The second coupling part is disposed at the end of the guide rod away from the cover.

[0012] In one embodiment, the explosion-proof valve further includes an elastic reset member, which extends along the movement direction of the movable member and is connected at both ends to the valve body and the movable member, respectively. After the electromagnet is energized, the magnetic coupling mechanism drives the movable member to switch to the pressure relief state. After the electromagnet is de-energized, the elastic reset member causes the movable member to switch to the closed state.

[0013] In one embodiment, the movable member passes through the first coupling portion and has a second coupling portion at its end. The elastic reset member is sleeved on the movable member and sandwiched between the second coupling portion and the valve body. The first coupling portion is spaced apart on the outer periphery of the elastic reset member, and the elastic reset member is configured as a compression spring.

[0014] In one embodiment, the valve body is further provided with a vent port communicating with the exhaust passage. The movable member can movably open and close the vent port and has a flange on the peripheral wall of the exhaust passage. Along the opening direction of the vent port, the valve body is also provided with a convex ring. In the closed state, the flange abuts against the convex ring.

[0015] In one embodiment, the electromagnet is provided with a first connection terminal and a second connection terminal, the first connection terminal being used to electrically connect to the battery of the battery pack, and the second connection terminal being used to electrically connect to the battery management system.

[0016] This utility model also proposes a battery pack, which includes the explosion-proof valve as described above.

[0017] This utility model also proposes a vehicle that includes the battery pack as described above.

[0018] The technical solution of this utility model is to set a magnetic coupling mechanism on the valve body. Utilizing the magnetic coupling between the first and second coupling parts, the moving part moves relative to the valve body along its direction of movement, allowing it to switch from a closed state (blocking the exhaust channel) to a pressure-relieving state (opening the exhaust channel). In the closed state, the explosion-proof valve acts as a seal, preventing internal and external substances from flowing along the exhaust channel. When the internal pressure of the battery pack abnormally increases, the moving part can passively open the exhaust channel through the pressure difference, releasing excessive internal pressure in a timely manner. Alternatively, energizing the electromagnet can generate a magnetic force between the first and second coupling parts, driving the moving part to switch to the pressure-relieving state, actively opening the exhaust channel. This allows for proactive regulation of internal pressure, preventing potential hazards and reducing early damage to the battery pack. Furthermore, after internal gas has been released to a certain extent, energizing the electromagnet and controlling the first and second coupling parts to keep the moving part in the pressure-relieving state can further expel abnormal internal gas, minimizing damage to the battery pack and improving the reliability of the explosion-proof valve. In addition, the magnetic conductor on the electromagnet can guide the magnetic flux generated by the electromagnet toward another coupling part to enhance the magnetic force between the first coupling part and the second coupling part, thereby improving the stability and reliability of the magnetic coupling mechanism in driving the moving parts to the depressurization state. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 is a structural schematic diagram of an embodiment of the explosion-proof valve provided by this utility model;

[0021] Figure 2 is a cross-sectional view of the explosion-proof valve in Figure 1;

[0022] Figure 3 is a magnified view of part A in Figure 2;

[0023] Figure 4 is a structural schematic diagram of the explosion-proof valve in Figure 1 from another perspective;

[0024] Figure 5 is a structural schematic diagram of the explosion-proof valve in Figure 1 from another perspective.

[0025] Explanation of icon numbers:

[0026] 100. Valve body; 110. Exhaust passage; 111. Vent port; 120. Receiving cavity; 130. Convex ring; 140. Elastic reset element; 200. Moving part; 210. Guide rod; 220. Cover; 221. Flange;

[0027] 300, Magnetic coupling mechanism; 310, First coupling part; 320, Second coupling part; 330, Magnetic conductor.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] In existing technologies, battery packs may encounter various abnormal situations during use, leading to damage due to excessive internal pressure. To address this, explosion-proof valves are typically installed on the battery pack to release this pressure. In these technologies, the explosion-proof valves are mechanical, passively opening and closing due to the high gas pressure inside the battery pack. However, these valves require a significant pressure difference between the inside and outside of the battery pack to open. Before the high internal pressure is generated, high-temperature gas has already accumulated for a considerable time, causing some damage to the battery. Similarly, after the explosion-proof valve opens, the pressure in the battery pack is rapidly released, followed by a prolonged period of slow venting. However, by this time, the pressure difference between the inside and outside of the battery pack has decreased to a small level, and the explosion-proof valve closes immediately. Some high-temperature, high-pressure gas remains inside the battery pack, potentially causing further damage.

[0033] This utility model proposes an explosion-proof valve.

[0034] Please refer to Figures 1 to 3. In one embodiment of this utility model, the explosion-proof valve includes:

[0035] Valve body 100, with an exhaust passage 110 inside the valve body 100;

[0036] The movable component 200 is movably disposed in the exhaust passage 110, having a closed state that blocks the exhaust passage 110 and a depressurized state that opens the exhaust passage 110; and

[0037] The magnetic coupling mechanism 300 includes a first coupling part 310 disposed on the valve body 100 and a second coupling part 320 disposed on the movable member 200. The first coupling part 310 and the second coupling part 320 are spaced apart from each other in the direction of movement of the movable member 200, and at least one of them is configured as an electromagnet. On the opposite side of the first coupling part 310 and the second coupling part 320, the electromagnet is provided with a magnetic conductive element 330.

[0038] When the electromagnet is energized, the magnetic coupling mechanism 300 can drive the movable part 200 to switch from the closed state to the depressurized state.

[0039] The technical solution of this utility model is to set a magnetic coupling mechanism 300 on the valve body 100. By utilizing the magnetic coupling effect between the first coupling part 310 and the second coupling part 320, the movable part 200 is driven to move relative to the valve body 100 along its movement direction, so that the movable part 200 can switch from the closed state of blocking the exhaust passage 110 to the depressurized state of opening the exhaust passage 110. Thus, in the closed state, the explosion-proof valve acts as a seal, preventing internal and external substances from flowing along the exhaust channel 110. When the internal pressure of the battery pack rises abnormally, the movable part 200 can passively open the exhaust channel 110 through the pressure difference to release the excessive internal pressure in time. Alternatively, by energizing the electromagnet, a magnetic force is generated between the first coupling part 310 and the second coupling part 320, thereby driving the movable part 200 to switch to the pressure-relieving state, actively opening the exhaust channel 110. This allows for proactive regulation of the internal pressure, preventing danger in advance and reducing damage to the battery pack in the early stages of anomalies. At the same time, after the internal gas has been discharged to a certain extent, the valve can be kept in the pressure-relieving state by maintaining the electromagnet or by energizing the first coupling part 310 and the second coupling part 320, controlling the movable part 200 to continue to be in the pressure-relieving state, thereby venting abnormal internal gas as much as possible, reducing damage to the battery pack, and improving the reliability of the explosion-proof valve. In addition, the magnetic conductor 330 on the electromagnet can guide the magnetic flux generated by the electromagnet toward another coupling part to enhance the magnetic force between the first coupling part 310 and the second coupling part 320, thereby improving the stability and reliability of the magnetic coupling mechanism 300 driving the movable part 200 to the depressurization state.

[0040] It is understandable that, compared to the original purely passive opening and closing explosion-proof valve, the explosion-proof valve in this embodiment has both passive and active pressure relief methods. The active pressure relief method implemented by the magnetic coupling mechanism 300 can control the moving part 200 to switch or maintain in the pressure relief state for a period of time after an abnormality occurs inside the battery pack and gas is discharged, thereby reducing the accumulation of high temperature and high pressure gases inside the battery pack and reducing damage to the battery pack. In addition, the magnetic coupling mechanism 300 uses a non-contact method to control the moving part 200, reducing the degree of interference between the active and passive control of the moving part 200. Without loss of generality, various sensors can be installed inside the battery pack to monitor various parameters within the battery pack. On the one hand, if a certain parameter becomes abnormal, the electromagnet can be energized to cause the magnetic coupling mechanism 300 to switch the movable part 200 to a depressurization state, thereby restoring the corresponding parameter inside the battery pack to the normal range. During this process, the pressure difference inside and outside the battery pack is not sufficient to cause the movable part 200 to passively switch to the depressurization state. Thus, by actively controlling the movable part 200, early protection of the battery pack can be achieved, reducing the damage to the battery pack. On the other hand, when the movable part 200 in the depressurization state switches back to the closed state, there is still a certain amount of abnormal gas inside the battery pack. At this time, the magnetic coupling mechanism 300 keeps the movable part 200 in the depressurization state, so that the movable part 200 will not be passively reset to the closed state, thereby prolonging the depressurization time. After the sensor detects that the parameters inside the battery pack are at normal values, the electromagnet is de-energized, and the magnetic coupling mechanism 300 controls the movable part 200 to reset to the closed state.

[0041] In the magnetic coupling mechanism 300, one of the first coupling part 310 and the second coupling part 320 can be located inside the valve body 100 and the other outside the valve body 100, or both can be located inside the valve body 100. The first coupling part 310 can be configured as an electromagnet, the second coupling part 320 can be configured as an electromagnet, or both the first coupling part 310 and the second coupling part 320 can be configured as electromagnets. In this regard, on the opposite side of the first coupling part 310 and the second coupling part 320, a magnetic guide 330 is provided on the side of the electromagnet facing the other. The magnetic guide 330 guides the magnetic flux of the corresponding coupling part to flow towards the other, thereby enhancing the magnetic force between the first coupling part 310 and the second coupling part 320, thereby improving the reliability of the magnetic coupling mechanism 300 in driving the movable part 200 to move to the depressurization state or maintaining the depressurization state. It is understandable that for an electromagnet, magnetic force is typically generated in the form of a coil, and the coil is wound according to the direction of movement of the movable part 200. A magnetic conductor is at least partially disposed on the side of the electromagnet facing the other coupling part. Here, the magnetic conductor can be made of iron or a material with low magnetic resistance, such as nickel. Regarding the opening and closing control of the exhaust passage 110 by the movable part 200, the movable part 200 can control the opening and closing of the exhaust passage 110 within the valve body 100, switching between a closed state and a pressure-relief state. Alternatively, the movable part 200 can control the opening and closing of the exhaust passage 110 at the opening on the exterior of the valve body 100, switching between a closed state and a pressure-relief state. For the application environment of the explosion-proof valve, it can be the battery packs of various devices, such as vehicles, lawnmowers, and robots. In this technical solution, a vehicle is used as an example.

[0042] In one embodiment, referring to Figures 2 and 3, the first coupling part 310 is configured as an electromagnet, and the second coupling part 320 is configured as a ferromagnet. It can be understood that the first coupling part 310 is fixed to the valve body 100, and the second coupling part 320 is fixed to the movable member 200. Under the magnetic force of the first coupling part 310 and the second coupling part 320, the second coupling part 320 moves together with the movable member 200 along the direction of movement, thereby switching the movable member 200 to a pressure-relief state or maintaining it in a pressure-relief state. Thus, configuring the first coupling part 310, which maintains stability during magnetic coupling, as an electromagnet avoids movement of the electromagnet, reduces the difficulty of conducting electricity to the electromagnet, and ensures the operational stability and reliability of the magnetic coupling mechanism 300. Furthermore, the ferromagnet has good magnetic conductivity and magnetization effects. After the electromagnet is energized and generates a magnetic field, the ferromagnet can move closer to the electromagnet, thereby driving the movable member 200 to switch to a pressure-relief state or maintain it in a pressure-relief state, thus ensuring the stability of the magnetic coupling mechanism 300 in driving the movable member 200. Of course, in other embodiments, the second coupling part 320 may be configured as an electromagnet and the first coupling part 310 may be configured as a ferromagnet, or both the first coupling part 310 and the second coupling part 320 may be configured as electromagnets, or the second coupling part 320 may be configured as a permanent magnet. The magnetic poles on the opposite side of the electromagnet may be the same, so that the moving part 200 is moved by repulsion, or they may be different, so that the moving part 200 is moved by attraction.

[0043] In one embodiment, referring to Figures 2 and 3, the movable member 200 passes through the first coupling portion 310, with one end used to block the exhaust passage 110 and the other end provided with the second coupling portion 320. It can be understood that the first coupling portion 310 magnetically couples with the second coupling portion 320 along the movement path of the movable member 200, resulting in the first coupling portion 310 being arranged around the outer periphery of the movable member 200. This allows for a more compact structural layout of the valve body 100, saving space and helping to reduce the volume of the explosion-proof valve. Furthermore, the electromagnet is magnetically coupled to the second coupling portion 320 located at one end of the movable member 200, while the other end of the movable member 200 opens and closes the exhaust passage 110. This results in forces being applied to both ends of the movable member 200, with the electromagnet positioned at or near the middle of the movable member 200. This creates balanced forces at both ends of the movable member 200, ensuring the stability of the movable member 200's movement along its direction of motion, thereby improving the stability of the explosion-proof valve's opening and closing switching. Furthermore, when the first coupling part 310 is configured as an electromagnet, it is located on the movement path of the movable member 200. The magnetic force generated by the electromagnet not only acts well on the second coupling part 320 but also directly on the movable member 200, improving the stability of the movable member 200 in actively inducing its movement or maintaining it in a depressurized state. Of course, in other embodiments, the first coupling part 310 can also be located outside the movement path of the movable member 200 and opposite the second coupling part 320 along the movement direction of the movable member 200. The second coupling part 320 can also be located in the middle of the movable member 200 in its movement direction. In this case, the first coupling part 310 can be partially penetrated by the movable member 200, presenting a situation where the movable member 200 blocks the exhaust channel 110, and the second coupling part 320 and the first coupling part 310 are arranged sequentially. The first coupling part 310 and the second coupling part 320 can interact through repulsive forces.

[0044] Further, in this embodiment, referring to Figures 2 and 4, the valve body 100 is also provided with a vent 111 communicating with the exhaust channel 110 and a receiving cavity 120 communicating with the vent 111. The magnetic coupling mechanism 300 is located in the receiving cavity 120. The movable part 200 includes a guide rod 210 and a cover 220. The cover 220 is movably disposed at the vent 111. The guide rod 210 is connected to the cover 220 from the receiving cavity 120. The second coupling part 320 is disposed at the end of the guide rod 210 away from the cover 220. It is understood that the guide rod 210 passes through the channel connecting the accommodating cavity 120 to the vent 111 and maintains a matching dimensional relationship with the channel. In this way, the exhaust channel 110 that discharges high-temperature and high-pressure gas can be effectively isolated from the magnetic coupling mechanism 300 that acts on the moving part 200, so as to avoid the high-temperature and high-pressure gas interfering with the operation of the magnetic coupling mechanism 300. The direction in which the gas in the exhaust channel 110 flows out of the vent 111 is the same as or close to the direction in which the guide rod 210 pushes the cover 220 to open the vent 111, so as to prevent high-temperature and high-pressure gas from entering the accommodating cavity 120. Meanwhile, the connection between the accommodating cavity 120 and the vent 111 also guides the guide rod 210, ensuring the stability of the cover 220 during the opening and closing of the vent 111. Furthermore, the second coupling part 320 is subjected to the magnetic force of the first coupling part 310 within the accommodating cavity 120, and the cover 220 opens and closes the vent 111 outside the accommodating cavity 120. This results in force being applied to both ends of the guide rod 210, and the middle of the guide rod 210 is supported by the connection between the accommodating cavity 120 and the vent 111. Therefore, when the magnetic coupling mechanism 300 acts on the movable part 200, the movable part 200 exhibits good stability. Of course, in other embodiments, the second coupling part 320 can also be disposed on the exhaust channel 110, with the first coupling part 310 outside the exhaust channel 110 and the second coupling part 320 generating a magnetic force.

[0045] For the active or passive opening of the explosion-proof valve by the movable part 200, in one embodiment, when it is necessary to close the explosion-proof valve, please refer to Figures 2 and 3. The explosion-proof valve also includes an elastic reset member 140. The elastic reset member 140 extends along the movement direction of the movable part 200 and its two ends are respectively connected to the valve body 100 and the movable part 200. After the electromagnet is energized, the magnetic coupling mechanism 300 drives the movable part 200 to switch to the pressure relief state. After the electromagnet is de-energized, the elastic reset member 140 causes the movable part 200 to switch to the closed state. During the energization of the electromagnet, the magnetic coupling mechanism 300 exerts a force on the movable part 200 to switch to or maintain its depressurized state. The elastic reset member 140 is in a state of increased elastic potential energy. After the electromagnet is de-energized, the electromagnetic force of the magnetic coupling mechanism 300 disappears, and the elastic reset member 140 releases its own elastic potential energy, causing the movable part 200 to return to its closed state and re-seal the exhaust passage 110. At this time, the elastic reset member 140 can retain some elastic potential energy to maintain the stability of the movable part 200 in its closed state, or it can be in a natural state, where the movable part 200 is engaged in the exhaust passage 110, thereby ensuring the sealing of the explosion-proof valve. Thus, the movable part 200 automatically resets to its closed state under the action of the elastic reset member 140, improving the closing efficiency of the explosion-proof valve, simplifying the connection complexity between the magnetic coupling mechanism 300 and the movable part 200, and avoiding interference from the magnetic coupling mechanism 300 in the way the movable part 200 passively switches to the depressurized state. The elastic reset mechanism can be configured as a compression spring or a tension spring, depending on its location. Alternatively, in other embodiments, a reset motor can be installed on the valve body 100. When the movable part 200 is in a depressurized state and needs to be switched back to a closed state, the reset motor drives the movable part 200 to the closed state, causing it to engage in the exhaust channel 110. The reset motor then returns to its original position to avoid interfering with the process of the movable part 200 passively opening the explosion-proof valve.

[0046] Specifically, in this embodiment, referring to Figures 2 and 3, the movable member 200 passes through the first coupling portion 310 and has a second coupling portion 320 at its end. The elastic reset member 140 is sleeved on the movable member 200 and sandwiched between the second coupling portion 320 and the valve body 100. The first coupling portion 310 is spaced apart on the outer periphery of the elastic reset member 140, and the elastic reset member 140 is configured as a compression spring. The movable member 200 passes through the first coupling part 310, which is spaced apart on the outer periphery of the elastic reset member 140. Both the elastic reset member 140 and the first coupling part 310 are located on the movement path of the movable member 200. The elastic reset member 140 abuts against the second coupling part 320 and the valve body 100 at both ends in its extension / retraction direction, thus being sandwiched between them. During the process where the first coupling part 310 and the second coupling part 320 generate magnetic force to cause the movable member 200 to move to a depressurized state, the second coupling part 320 moves closer to the first coupling part 310, thereby compressing the elastic reset member 140. The elastic reset member 140 is in an elastically contracted state. After the electromagnet is de-energized, the magnetic force between the first coupling part 310 and the second coupling part 320 disappears, and the elastic reset member 140 releases its elastic force, causing the second coupling part 320 to move away from the first coupling part 310, thereby pushing the movable member 200 back to a closed state. Thus, by sleeved on the movable member 200 and positioned between the second coupling part 320 and the valve body 100, and also between the first coupling part 310 and the guide rod 210 of the movable member 200, the compactness of the explosion-proof valve can be improved. Furthermore, the elastic force of the elastic reset member 140 on the movable member 200 is parallel to the direction of movement of the movable member 200, ensuring the stability of the movable member 200 when switching to the closed state. Alternatively, in other embodiments, the elastic reset member 140 can be configured as a tension spring, positioned in front of the movable member 200 in the direction of switching to the closed state, to reset the movable member 200 to the closed state by pulling it. In this case, the first coupling part 310 can be positioned in the same location as the elastic reset member 140, acting on the second coupling part 320 with magnetic repulsion, or it can be positioned on the outer periphery of the movable member 200, acting on the second coupling part 320 with magnetic attraction, thereby driving the movable member 200 to switch to the depressurization state or maintain it in the depressurization state.

[0047] Regarding the sealing performance of the explosion-proof valve in the closed state, please refer to Figure 2. The valve body 100 is also provided with a vent 111 that connects to the exhaust passage 110. The movable member 200 can movably open and close the vent 111, and a flange 221 is provided on the peripheral wall of the exhaust passage 110. Along the opening direction of the vent 111, the valve body 100 is also provided with a convex ring 130. In the closed state, the flange 221 abuts against the convex ring 130. It can be understood that, referring to the above-mentioned configuration of the cover 220, the flange 221 is located at the periphery of the cover 220. The flange 221 abuts against the convex ring 130 in the movement direction of the movable member 200. After the movable member 200 switches to the closed state, the flange 221 abuts against the convex ring 130, reducing the probability that the exhaust passage 110 is not properly sealed due to process or other reasons, thereby improving the sealing performance of the explosion-proof valve. Without loss of generality, the explosion-proof valve is also equipped with a sealing ring between the flange 221 of the cover 220 and the vent 111. In the closed state, the sealing ring is sandwiched between the cover 220 and the valve body 100 to block the exhaust passage 110, thereby ensuring the sealing performance of the explosion-proof valve in the closed state. In addition, the flow channel section extending from the exhaust passage 110 to the vent 111 is flared. Correspondingly, the cover 220 can be plate-shaped. When the cover 220 covers and blocks the vent 111, there is a gap between the cover 220 and the flared section of the exhaust passage 110 connecting to the vent 111, thereby preventing the exhaust passage 110 from interfering with the cover 220's sealing of the vent 111 and ensuring the sealing performance of the explosion-proof valve in the closed state.

[0048] In one embodiment, referring to Figures 2, 4, and 5, the electromagnet is provided with a first connection end (not shown) and a second connection end (not shown). The first connection end is used to electrically connect to the battery of the battery pack, and the second connection end is used to electrically connect to the battery management system. The electromagnet is electrically connected to the battery of the battery pack through the first connection end, ensuring the stability of the operation of the magnetic coupling mechanism 300. After the battery management system receives an abnormal data signal from the battery pack, it determines that the battery pack is at risk of thermal runaway. It then sends a control command to the electromagnet via the second connection end, causing the magnetic coupling mechanism 300 to drive the movable part 200 to open the exhaust channel 110, completing the valve opening and venting the high-temperature gas from the battery pack. Conversely, when the battery management system receives data indicating that the data from the battery pack has returned to normal, it determines that the environment inside the battery pack has stabilized. It then sends a control command to the electromagnet via the second connection end, causing the magnetic coupling mechanism 300 to control the movable part 200 to close the exhaust channel 110, completing the valve closing. This maximizes the venting of high-temperature gas and simplifies the control logic by utilizing the control chain resources of the battery management system. Of course, in other embodiments, the first connection end may also be connected to other power sources of the vehicle rather than the battery pack's battery, and the second connection end may also be connected to other control systems of the vehicle, such as the vehicle infotainment system, rather than directly connected to the battery management system.

[0049] This utility model also proposes a battery pack, which includes an explosion-proof valve. The specific structure of the explosion-proof valve is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The battery pack can be configured as a power battery for various devices such as vehicles, robots, and lawnmowers. The explosion-proof valve is installed on the side wall of the battery pack and can communicate with the interior of the battery pack.

[0050] This utility model also proposes a vehicle that includes a battery pack. The specific structure of the battery pack is as described in the above embodiments. Since this vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body has an exhaust passage. A movable component is movably disposed in the exhaust passage to have a closed state that blocks the exhaust passage and a depressurized state that opens the exhaust passage; The magnetic coupling mechanism includes a first coupling portion disposed on the valve body and a second coupling portion disposed on the movable member. The first coupling portion and the second coupling portion are spaced apart from each other in the direction of movement of the movable member, and at least one of them is configured as an electromagnet. On the opposite side of the first coupling portion and the second coupling portion, the electromagnet is provided with a magnetic conductive element. When the electromagnet is energized, the magnetic coupling mechanism can drive the movable member to switch from the closed state to the pressure relief state.

2. The explosion-proof valve as described in claim 1, characterized in that, The first coupling part is configured as an electromagnet, and the second coupling part is configured as a ferromagnet.

3. The explosion-proof valve as described in claim 1, characterized in that, The movable part passes through the first coupling part, with one end used to block the exhaust passage and the other end provided with the second coupling part.

4. The explosion-proof valve as described in claim 3, characterized in that, The valve body is also provided with a vent port communicating with the exhaust channel and a receiving cavity communicating with the vent port. The magnetic coupling mechanism is located in the receiving cavity. The movable part includes a guide rod and a cover. The cover is movably disposed at the vent port. The guide rod is connected to the cover from the receiving cavity. The second coupling part is disposed at the end of the guide rod away from the cover.

5. The explosion-proof valve as described in claim 1, characterized in that, The explosion-proof valve also includes an elastic reset member, which extends along the movement direction of the movable member and is connected at both ends to the valve body and the movable member, respectively. After the electromagnet is energized, the magnetic coupling mechanism drives the movable member to switch to the pressure relief state. After the electromagnet is de-energized, the elastic reset member causes the movable member to switch to the closed state.

6. The explosion-proof valve as described in claim 5, characterized in that, The movable member passes through the first coupling portion and has a second coupling portion at its end. The elastic reset member is sleeved on the movable member and sandwiched between the second coupling portion and the valve body. The first coupling portion is spaced apart on the outer periphery of the elastic reset member. The elastic reset member is configured as a compression spring.

7. The explosion-proof valve as described in claim 1, characterized in that, The valve body is also provided with a vent that connects to the exhaust passage. The movable part can open and close the vent, and a flange is provided on the peripheral wall of the exhaust passage. Along the opening direction of the vent, the valve body is also provided with a convex ring. In the closed state, the flange abuts against the convex ring.

8. The explosion-proof valve as described in any one of claims 1 to 7, characterized in that, The electromagnet is provided with a first connection end and a second connection end. The first connection end is used to electrically connect to the battery of the battery pack, and the second connection end is used to electrically connect to the battery management system.

9. A battery pack, characterized in that, Includes the explosion-proof valve as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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