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 anti-explosion valves, the anti-explosion valve comprises a valve body, a movable part and a monitoring switch; an exhaust channel is arranged in the valve body, and the valve body is provided with an avoiding opening communicated with the exhaust channel. 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 monitoring switch is arranged outside the valve body, the receding opening is used for receding at least one of the monitoring switch and the movable part, and the monitoring switch has an initial state matched with the closed state and a triggering state for recognizing the pressure relief state. According to the technical scheme provided by the utility model, the safety of the battery pack under various working conditions is improved by monitoring the state of the anti-explosion valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of explosion -proof valve, especially relates to a kind of explosion -proof valve, battery pack and vehicle. BACKGROUND

[0002] Battery can face various abnormal conditions in use process, such as overcharge, overdischarge, short circuit, internal short circuit, high temperature environment etc., these abnormal conditions can cause the pressure in battery to rise sharply, and then cause battery to swell, leakage and even explosion Serious safety accidents.The related technology will set explosion-proof valve on battery pack, however, when the internal and external pressure difference of battery pack is caused due to the external environment of battery, the explosion-proof valve is often caused to open, at this time, external impurities are easy to invade battery through explosion-proof valve, affect the use of battery or damage battery. SUMMARY

[0003] The utility model discloses a kind of explosion-proof valve, battery pack and vehicle, to improve the security of battery pack under various conditions by the way of monitoring explosion-proof valve state.

[0004] To achieve the above object, the explosion-proof valve provided by the utility model comprises:

[0005] Valve body, the valve body is provided with exhaust passage, the valve body is provided with the avoidance mouth that is communicated with the exhaust passage;

[0006] Movable element, the movable element is movably arranged in the exhaust passage, to have the closed state of plugging the exhaust passage and the pressure relief state of conducting the exhaust passage;And

[0007] Monitoring switch, the monitoring switch is arranged outside the valve body, the avoidance mouth is used to avoid at least one of the monitoring switch and the movable element, the monitoring switch has initial state adapted to the closed state and trigger state identified the pressure relief state.

[0008] In an embodiment, the valve body is further provided with the gas vent that is communicated with the exhaust passage, the gas vent and the avoidance mouth are separately arranged on opposite sides of the valve body, and the movable element is oppositely arranged along the avoidance mouth along the moving direction.

[0009] In an embodiment, the movable element comprises a cover body and a guide rod connected with each other, the cover body is movably arranged in the gas vent, and the avoidance mouth and the end portion of the guide rod away from the cover body are opposite to each other, in the closed state, the guide rod abuts against the monitoring switch, and the cover body closes the gas vent.

[0010] In an embodiment, the valve body comprises a mounting portion and a protruding portion connected with each other, the air vent is arranged on the mounting portion, the guide rod is movably arranged in the protruding portion, the avoiding opening is arranged on the end of the protruding portion, and the monitoring switch is arranged on the protruding portion.

[0011] In an embodiment, the valve body further comprises an elastic member, the end of the guide rod away from the cover body is provided with a limiting flange, and the elastic member is sleeved on the guide rod and abuts against the valve body and the limiting flange at two ends.

[0012] In an embodiment, the valve body comprises a mounting portion and a protruding portion connected with each other, the air vent is arranged on the mounting portion, the guide rod is movably arranged in the protruding portion, the avoiding opening is arranged on the end of the protruding portion, and the monitoring switch is arranged on the protruding portion.

[0013] In an embodiment, the monitoring switch covers the avoiding opening, the monitoring switch is provided with a movable trigger portion, and the trigger portion extends into the exhaust passage through the avoiding opening.

[0014] In an embodiment, the valve body further comprises an air vent connected with the exhaust passage, and the explosion-proof valve further comprises a sealing ring, the sealing ring is annularly arranged on the periphery of the air vent and clamped between the movable member and the valve body.

[0015] In an embodiment, the monitoring switch is provided with a first connecting end and a second connecting end, the first connecting end is used for electrically connecting with a battery of a battery pack, and the second connecting end is used for electrically connecting with a battery management system.

[0016] In an embodiment, the monitoring switch comprises a switch body and a trigger portion, the trigger portion is movably connected with the switch body, the switch body is provided with a control circuit, in the closed state, the trigger portion is away from the control circuit, the control circuit forms an open circuit, the monitoring switch is in the initial state, in the pressure relief state, the trigger portion abuts against the control circuit, the control circuit forms a passage, and the monitoring switch is in the triggered state.

[0017] The utility model also proposes a battery pack, the battery pack comprises the explosion-proof valve as aforementioned.

[0018] The utility model also proposes a vehicle, the vehicle comprises the battery pack as aforementioned.

[0019] The utility model discloses a technical scheme sets up the avoidance mouth on the valve body, and installs the monitoring switch outside the valve body, and the monitoring switch can monitor the on-off control of the exhaust passage to the movable element through the avoidance mouth, when the pressure difference of the environment where the explosion -proof valve is kept stable, the movable element blocks the exhaust passage, and the monitoring switch is in the initial state at this time, can not trigger or is the signal that the movable element is in the closed state to the outside controller is transported, when the movable element is due to the pressure difference and leads to the exhaust passage, the monitoring switch detects the activity of the movable element through the avoidance mouth, and then switches from the initial state to the trigger state, and generates the trigger signal, and the external controller combines the environment of current explosion -proof valve to judge whether the explosion -proof valve is triggered mistakenly, thereby avoiding that the external impurity invades the battery pack through the explosion -proof valve, causes the battery pack damage, improves the security of battery pack under various working conditions. In addition, the monitoring switch is arranged outside the valve body, reduces the change to the original valve body and movable element, reduces the development difficulty and cost, and when the equipment carrying the battery pack belongs to the dormant state, the monitoring switch under the trigger state can also activate the equipment and realize the alarm, to reduce the gas pressure sensor that sets up alone, reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description briefly introduce, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to the structure shown in these drawings.

[0021] Figure 1 It is the sectional view of an embodiment of explosion -proof valve provided by the utility model;

[0022] Figure 2 It is Figure 1 It is the local enlarged view of A in the middle;

[0023] Figure 3 It is Figure 1 It is the structure schematic view of monitoring switch.

[0024] EXPLANATION OF DRAWINGS:

[0025] 100, valve body;110, mounting portion;111, air release port;120, protruding portion;121, avoidance mouth;130, exhaust passage;140, elastic element;200, movable element;210, guide rod;211, limiting flange;220, cover body;

[0026] 300, monitoring switch;310, switch body;320, trigger part;330, first connecting end;340, second connecting end.

[0027] The purposes, functional features and advantages of the utility model will be further explained in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0030] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the utility model.

[0031] In the prior art, the battery pack may face various abnormal situations during use, causing the battery pack to be damaged due to a large internal pressure. To this end, an explosion-proof valve is usually provided on the battery pack to release the large pressure in the battery pack. In related technologies, the explosion-proof valve is a mechanical explosion-proof valve that is passively opened and closed by the large gas pressure in the battery pack. However, once the battery pack involves a complex external environment, the explosion-proof valve may be mistakenly opened, such as when the vehicle is involved in water or enters a tunnel, and other drastic changes inside and outside the battery pack cause the explosion-proof valve to open. If the vehicle is involved in water at this time, the battery pack will be flooded, which poses a safety hazard to the battery pack. Also, when the vehicle enters a dormant state, the explosion-proof valve cannot reverse the wake-up of the battery management system, and to this end, a gas pressure sensor needs to be provided in the battery pack to realize the wake-up function, thereby increasing the cost.

[0032] The utility model provides a kind of explosion-proof valve.

[0033] Please refer to Figure 1 And Figure 2 In an embodiment of the utility model, the explosion-proof valve comprises:

[0034] Valve body 100, exhaust passage 130 is provided in valve body 100, and valve body 100 is provided with the avoidance mouth 121 communicated with exhaust passage 130;

[0035] Movable part 200, movable part 200 is movably arranged in exhaust passage 130, to have the closure state of plugging exhaust passage 130 and the pressure relief state of guiding exhaust passage 130;And

[0036] Monitoring switch 300, monitoring switch 300 is arranged outside valve body 100, avoidance mouth 121 is used to avoid at least one of monitoring switch 300 and movable part 200, and monitoring switch 300 has the initial state of adapting closure state and the trigger state of identifying pressure relief state.

[0037] The technical scheme of the utility model sets up avoidance mouth 121 on valve body 100, and installs monitoring switch 300 outside valve body 100, and monitoring switch 300 can monitor the on-off control of movable part 200 to exhaust passage 130 through avoidance mouth 121, when the pressure difference of the environment where explosion-proof valve is kept stable, movable part 200 plugs exhaust passage 130, and monitoring switch 300 is in initial state at this time, can not trigger or is towards the signal of the external controller conveying movable part 200 in closure state etc., when movable part 200 is due to the pressure difference and guides exhaust passage 130, monitoring switch 300 detects the activity of movable part 200 through avoidance mouth 121, and then switches from initial state to trigger state, and generates trigger signal, for external controller to combine the environment of current explosion-proof valve, to judge whether explosion-proof valve is mis-triggered, to avoid that external impurities invade battery pack through explosion-proof valve, cause battery pack damage, improve the safety of battery pack under various working conditions.In addition, monitoring switch 300 is arranged outside valve body 100, reduces the modification to original valve body 100 and movable part 200, reduces development difficulty and cost, and simultaneously, for the equipment belonging to dormant state when carrying battery pack, monitoring switch 300 under trigger state can also activate the equipment to realize alarm, to reduce the gas pressure sensor of separate setting, reduces cost.

[0038] It should be noted that the initial state of the monitoring switch 300 is adapted to the closed state of the movable piece 200, and the monitoring switch 300 in the initial state can not deliver a signal to the outside or deliver a signal that the movable piece 200 is in the closed state. The triggered state of the monitoring switch 300 can identify the pressure relief state of the movable piece 200, and the monitoring switch 300 in the triggered state can output a trigger signal to the outside. At this time, the monitoring switch 300 can be in a pass-through state or in an open circuit state to be judged by an external controller that the monitoring switch 300 has switched to the triggered state. The monitoring switch 300 monitors the movable piece 200 through the avoidance opening 121, and the movable piece 200 acting on the monitoring switch 300 can be direct abutment or interval identification such as magnetic signal, sensing distance, etc. In this regard, the movable piece 200 can extend out of the avoidance opening 121 to act on the monitoring switch 300, or the monitoring switch 300 can extend into the avoidance opening 121 for the movable piece 200 to act in the exhaust passage 130.

[0039] It can be understood that the monitoring switch 300 is arranged outside the valve body 100, and the structure of the original mechanical explosion-proof valve is not changed too much, and the exhaust passage 130 is still connected to the battery pack and can be connected to the outside. By arranging the avoidance opening 121 in the valve body 100 for the monitoring switch 300 to identify the state of the movable piece 200, the opening and closing monitoring function of the explosion-proof valve is realized, the original explosion-proof valve mold is not changed too much, thereby reducing the cost and facilitating the subsequent maintenance and replacement of the monitoring switch 300. For the opening and closing control of the movable piece 200 on the exhaust passage 130, the movable piece 200 can control the opening and closing of the exhaust passage 130 in the valve body 100 to realize the switching between the closed state and the pressure relief state, or the movable piece 200 can control the opening and closing of the opening of the exhaust passage 130 outside the valve body 100 to realize the switching between the closed state and the pressure relief state of the movable piece 200. For the application environment of the explosion-proof valve, it can be the battery pack of various devices such as vehicles, lawn mowers, robots, etc. In the technical solution, the vehicle is introduced.

[0040] In an embodiment, please refer to Figure 1 and Figure 2The valve body 100 is further provided with a gas discharge port 111 communicating with the exhaust passage 130, the gas discharge port 111 and the avoiding port 121 are arranged on opposite sides of the valve body 100, and the movable member 200 is arranged opposite to the avoiding port 121 along the moving direction. It should be noted that the explosion-proof valve is installed in the battery pack, the gas discharge port 111 is located on the side of the battery pack outside, the avoiding port 121 is located on the side of the battery pack inside, and the monitoring switch 300 is located in the battery pack, thereby avoiding the interference of sundries outside the battery pack to the operation of the monitoring switch 300, and ensuring the operation stability of the monitoring switch 300. At the same time, the gas discharge port 111 and the avoiding port 121 are arranged on opposite sides of the valve body 100, thereby reducing the interference of the gas flowing in the exhaust passage 130 to the monitoring of the movable member 200 by the monitoring switch 300. In addition, the movable member 200 is arranged opposite to the avoiding port 121 along the moving direction, which enables the monitoring switch 300 to more directly monitor the movement of the movable member 200, and thereby more accurately identify the displacement of the movable member 200 to the closed state or the pressure relief state. Of course, in other embodiments, the monitoring switch 300 can also be arranged on the side of the explosion-proof valve outside the battery pack, or the avoiding port 121 is arranged in a direction intersecting the moving direction of the movable member 200, and the monitoring switch 300 identifies the position of the movable member 200 to determine whether the movable member 200 is in the closed state or the pressure relief state, thereby switching between the initial state and the triggered state.

[0041] Further, in the present embodiment, please refer to Figure 1 and Figure 2The movable member 200 comprises a cover 220 and a guide rod 210 connected with each other. The cover 220 is movably arranged at the air vent 111. The end of the guide rod 210 away from the cover 220 is opposite to the avoiding hole 121. In the closed state, the guide rod 210 abuts against the monitoring switch 300, and the cover 220 closes the air vent 111. It can be understood that when the movable member 200 is in the closed state, the air vent 111 is closed by the cover 220, and the guide rod 210 abuts against the monitoring switch 300, so that the monitoring switch 300 can clearly perceive the position of the guide rod 210, thereby accurately judging whether the explosion-proof valve is in the closed state. Correspondingly, in the process of opening the air vent 111 by the cover 220, the guide rod 210 will move with the cover 220. The monitoring switch 300 can understand the dynamic process of opening the air vent 111 by the movable member 200 by detecting the displacement change of the guide rod 210. After the cover 220 opens the air vent 111, the guide rod 210 also moves away from the monitoring switch 300, so that the monitoring switch 300 obtains a clear signal, thereby switching from the initial state to the triggered state, to transmit the signal that the movable member 200 is in the air vent state. In addition, the guide rod 210 extends in the activity direction of the movable member 200 and is opposite to the avoiding hole 121. The activity of the guide rod 210 can accurately reflect the switching of the movable member 200 between the closed state and the pressure relief state, thereby ensuring the reliability of the monitoring switch 300 in monitoring the opening and closing of the explosion-proof valve. Of course, in other embodiments, the avoiding hole 121 can also be opposite to the cover 220 along the activity direction of the movable member 200, and the monitoring switch 300 monitors the position of the cover 220 to judge whether the movable member 200 is in the closed state or the pressure relief state.

[0042] Specifically, in the present embodiment, please refer to Figure 1 and Figure 2The valve body 100 comprises a mounting portion 110 and a protruding portion 120 connected with each other, the air vent 111 is arranged on the mounting portion 110, the guide rod 210 is movably arranged in the protruding portion 120, the avoiding opening 121 is arranged on the end of the protruding portion 120, and the monitoring switch 300 is arranged on the protruding portion 120. It can be understood that the monitoring switch 300 is arranged on the protruding portion 120, so that the guide rod 210 can be directly monitored in a close range, and in particular, the guide rod 210 is beneficial to be monitored by the monitoring switch 300 in an abutting manner. Meanwhile, the avoiding opening 121 is arranged on the end of the protruding portion 120 away from the mounting portion 110, and the monitoring switch 300 is also arranged on the exposed end of the protruding portion 120, so that the structural complexity of the monitoring switch 300 for identifying the moving part 200 through the avoiding opening 121 is reduced, and additional space layout adjustment or complex signal transmission line design is avoided. In addition, the exposed end of the protruding portion 120 is away from the air vent 111, so that a relatively stable installation environment is provided for the monitoring switch 300, and the influence of factors such as vibration on the monitoring switch 300 is reduced. Of course, in other embodiments, the monitoring switch 300 can also be arranged on the mounting portion 110, and the avoiding opening 121 can be arranged on the side wall of the protruding portion 120.

[0043] In an embodiment, referring to Figure 1 and Figure 2 The valve body 100 is further provided with an elastic member 140, the end of the guide rod 210 away from the cover body 220 is provided with a limiting flange 211, the elastic member 140 is sleeved on the guide rod 210, and the two ends thereof abut against the valve body 100 and the limiting flange 211 respectively. After the cover body 220 is lifted by the air pressure to open the air vent 111, the moving part 200 moves towards the air vent 111, the elastic member 140 is compressed to an elastic compression state by the limiting flange 211, and correspondingly, the moving part 200 is in a pressure relief state, and the monitoring switch 300 is in a triggered state. After the internal and external air pressure difference of the battery pack is balanced, the elastic member 140 will exert a force on the guide rod 210 in a closing direction due to the elastic potential energy thereof, so as to drive the guide rod 210 to drive the cover body 220 to return to a position of closing the air vent 111, thereby driving the moving part 200 to reset from the pressure relief state to the closed state. Correspondingly, the guide rod 210 will abut against the monitoring switch 300 again, and the monitoring switch 300 will also switch to an initial state. In this way, the monitoring switch 300 only needs to monitor whether the guide rod 210 is in a correct position in the closed state, and does not need to monitor the whole movement process of the guide rod 210 in detail, so that the number of monitoring points and the complexity of the monitoring switch 300 are reduced. In addition, in the closed state, the elastic member 140 is also in an elastic state, so as to guarantee the stability of the moving part 200 in the closed state. The elastic member 140 is configured as a compression spring. Of course, in other embodiments, the elastic member 140 can also be configured as a tension spring, and acts between the cover body 220 and the mounting portion 110.

[0044] For the object recognized by the monitoring switch 300, in another embodiment, the movable member 200 comprises the connecting guide rod 210 and the cover 220, the valve body 100 comprises the connecting mounting portion 110 and the protruding portion 120, the air vent 111 is arranged on the mounting portion 110, the cover 220 is movably arranged on the mounting portion 110, the guide rod 210 is movably arranged in the protruding portion 120, the avoiding port 121 is arranged on the side of the mounting portion 110 away from the air vent 111, the avoiding port 121 is opposite to the cover 220, in the closed state, the cover 220 abuts against the monitoring switch 300 and closes the air vent 111. It can be understood that in the closed state, the monitoring switch 300 is in the initial state due to the abutment of the cover 220, when the air pressure difference pushes open the movable member 200, the movement of the cover 220 directly reflects the opening and closing of the air vent 111, the monitoring switch 300 can exactly know whether the explosion-proof valve is normally opened and closed through the contact with the cover 220, and the safety hidden danger caused by the incomplete closing of the cover 220 is reduced. Correspondingly, in the pressure relief state, the cover 220 leaves the monitoring switch 300 and opens the air vent 111, at this time the monitoring switch 300 is switched to the triggered state without the abutment of the cover 220, the monitoring switch 300 can detect the displacement change of the cover 220, so as to judge that the air vent 111 is opened. In this way, the monitoring switch 300 directly recognizes the cover 220 controlling the opening and closing of the air vent 111, which improves the accuracy and reliability of the monitoring switch 300 in recognizing the opening and closing of the explosion-proof valve.

[0045] In an embodiment, please refer to Figures 1 to 3The monitoring switch 300 covers the escape port 121, and the monitoring switch 300 is provided with a movable trigger portion 320, and the trigger portion 320 is arranged to extend into the exhaust passage 130 through the escape port 121. It can be understood that in the embodiment, the structure of the valve body 100 does not need to be greatly changed, and only the escape port 121 needs to be arranged on the valve body 100, so that the trigger portion 320 can extend in, which reduces the influence and cost increase of the explosion-proof valve function caused by the structural change. At the same time, the trigger portion 320 is movably arranged on the monitoring switch 300, and the movement direction of the trigger portion 320 is parallel to the movement direction of the movable part 200. The trigger portion 320 extending into the exhaust passage 130 will not interfere with the movement of the movable part 200, nor will it affect the explosion-proof performance of the explosion-proof valve, ensuring that the explosion-proof valve can still work stably and reliably under new monitoring requirements. In addition, the monitoring switch 300 covers the escape port 121, and the monitoring switch 300 does not need to be installed through a complex installation process, so that the trigger portion 320 can accurately extend into the exhaust passage 130, which simplifies the installation difficulty and is convenient for subsequent maintenance and replacement of the monitoring switch 300. Of course, in other embodiments, a protruding part can be added to the movable part 200, so that the protruding part extends out of the escape port 121 and abuts against the trigger portion 320 of the monitoring switch 300, so that the initial state and the triggered state of the monitoring switch 300 are synchronized with the closed state and the pressure relief state of the movable part 200.

[0046] For the sealing structure of the explosion-proof valve, in an embodiment, please refer to Figure 1 and Figure 2 The valve body 100 is also provided with a gas discharge port 111 communicating with the exhaust passage 130, and the explosion-proof valve is also provided with a sealing ring, which is annularly arranged around the periphery of the gas discharge port 111 and clamped between the movable part 200 and the valve body 100. It can be understood that the sealing ring can effectively fill the gap between the movable part 200 and the valve body 100, prevent external gas from entering the battery pack from the gas discharge port 111 when the explosion-proof valve is closed, ensure that the explosion-proof valve maintains good sealing performance in the closed state, and avoid battery failure or affect the normal operation of the battery system caused by gas intrusion. At the same time, the sealing ring is arranged on the gas discharge port 111, which can separate external impurities on the outermost side of the explosion-proof valve, thereby reducing the influence of external impurities on the performance of the explosion-proof valve. In addition, during the movement of the movable part 200, the sealing ring can also reduce the friction and wear between the movable part 200 and the valve body 100, and ensure the stability of the explosion-proof valve. Of course, in other embodiments, a sealing structure can also be arranged at other positions of the exhaust passage 130 to ensure that the exhaust passage 130 is blocked in the closed state.

[0047] For the way of signal transmission of the monitoring switch 300, in an embodiment, please refer to Figure 1 and Figure 3The monitoring switch 300 is provided with a first connecting end 330 and a second connecting end 340. The first connecting end 330 is electrically connected to the battery of the battery pack, and the second connecting end 340 is electrically connected to the battery management system. The monitoring switch 300 is electrically connected to the battery of the battery pack through the first connecting end 330, so as to obtain power supply and acquire key parameters such as voltage and current of the battery, and then monitor the state of the battery pack. When the battery has an abnormality such as short circuit, over-temperature, over-current and the like, the monitoring switch 300 can rapidly detect the abnormal signals and transmit the fault information to the battery management system through the second connecting end 340. After receiving the fault signals, the battery management system can timely issue an alarm to remind the user to take corresponding measures such as stopping charging or discharging, so as to avoid the occurrence of safety accidents. Meanwhile, when the vehicle is in a dormant state, the battery still supplies power to the monitoring switch 300. Once the monitoring switch 300 is switched to a triggered state, the signal will be transmitted to the battery management system through the second connecting end 340, and the battery management system will be woken up to issue a warning and activate other monitoring devices for comprehensive monitoring of the battery pack, so as to ensure the safe use of the battery pack and reduce the cost of separately setting a sensor for waking up the battery management system. Of course, in other embodiments, the first connecting end 330 can be connected to other power sources of the vehicle instead of the battery of the battery pack, and the second connecting end 340 can be connected to other control systems of the vehicle such as the car system instead of being directly connected to the battery management system.

[0048] In an embodiment, please refer to Figure 1 and Figure 3The monitoring switch 300 comprises a switch body 310 and a triggering part 320, the triggering part 320 is movably connected to the switch body 310, and the switch body 310 is provided with a control circuit; in the closed state, the triggering part 320 is away from the control circuit, the control circuit forms an open circuit, and the monitoring switch 300 is in an initial state; in the pressure relief state, the triggering part 320 abuts against the control circuit, the control circuit forms a passage, and the monitoring switch 300 is in a triggered state. It should be noted that, most of the time, the movable part 200 of the explosion-proof valve is in the closed state, correspondingly, the triggering part 320 is abutted by the movable part 200, so that the control circuit of the monitoring switch 300 forms an open circuit, and then the monitoring switch 300 is in the initial state most of the time, the energy consumption of the monitoring switch 300 is reduced, and meanwhile, the monitoring switch 300 can avoid transmitting signals outward in the initial state, and the probability of false triggering is reduced. Once the movable part 200 of the explosion-proof valve is switched to the pressure relief state, the triggering part 320 is separated from the abutting action of the movable part 200, can abut against the control circuit to form a passage, and the monitoring switch 300 can transmit the monitoring signal outward, on the one hand, the battery management system in the dormant state can be activated, and on the other hand, the relative relationship between the triggering part 320 and the control circuit will not be changed due to slight vibration, and then the false triggering caused by external interference is reduced. Of course, in other embodiments, in the closed state, the triggering part 320 can abut against the control circuit under the action of the movable part, the control circuit forms a passage, and the monitoring switch 300 is in the initial state; in the pressure relief state, the triggering part 320 is separated from the movable part and is away from the control circuit, the control circuit forms an open circuit, and the monitoring switch 300 is in the triggered state.

[0049] The utility model discloses still a kind of battery pack, which comprises explosion-proof valve, and the specific structure of the explosion-proof valve refers to the above embodiment, since the battery pack adopts all technical solutions of the above all embodiments, it at least has all beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, battery pack can be configured as the power battery of vehicle, robot, mower and various equipment, and the explosion-proof valve is installed on the side wall of the battery pack and can be communicated with the inside of the battery pack.

[0050] The utility model discloses still a kind of vehicle, which comprises battery pack, and the specific structure of the battery pack refers to the above embodiment, since the vehicle adopts all technical solutions of the above all embodiments, it at least has all beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0051] The above-mentioned is only the exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawing contents or directly / indirectly applied in other related technical fields is included in the patent protection range of the utility model.

Claims

1. An explosion relief valve, characterized in that The valve body is provided with an exhaust passage, and an avoiding port is formed in the valve body and communicated with the exhaust passage. An active element is movably arranged in the exhaust passage to have a closed state for blocking the exhaust passage and a pressure relief state for guiding the exhaust passage. A monitoring switch is arranged outside the valve body, and the avoiding port is used to avoid at least one of the monitoring switch and the active element. The valve body is further provided with a gas discharge port communicated with the exhaust passage, and the gas discharge port and the avoiding port are arranged on opposite sides of the valve body. The active element includes a cover body and a guide rod connected with each other, the cover body is movably arranged in the gas discharge port, and the avoiding port and the end of the guide rod away from the cover body are opposite to each other.

2. The explosion relief valve of claim 1, wherein In the closed state, the guide rod abuts against the monitoring switch, and the cover body closes the gas discharge port.

3. The explosion relief valve of claim 2, wherein, The valve body includes a mounting portion and a protruding portion connected with each other, the gas discharge port is arranged in the mounting portion, the guide rod is movably arranged in the protruding portion, the avoiding port is arranged at the end of the protruding portion, and the monitoring switch is arranged in the protruding portion.

4. The explosion relief valve of claim 3, wherein And / or, the valve body is further provided with an elastic element, the end of the guide rod away from the cover body is provided with a limiting flange, and the elastic element is sleeved on the guide rod and abuts against the valve body and the limiting flange at two ends respectively. The active element includes a guide rod and a cover body connected with each other, the valve body includes a mounting portion and a protruding portion connected with each other, the gas discharge port is arranged in the mounting portion, the cover body is movably arranged in the mounting portion, the guide rod is movably arranged in the protruding portion, and the avoiding port is arranged on the side of the mounting portion away from the gas discharge port.

5. The explosion relief valve of claim 2, wherein The avoiding port and the cover body are opposite to each other, in the closed state, the cover body abuts against the monitoring switch and closes the gas discharge port. The monitoring switch covers the avoiding port, the monitoring switch is provided with a movable trigger portion, and the trigger portion extends into the exhaust passage through the avoiding port.

6. The explosion relief valve of claim 1, wherein And / or, the valve body is further provided with a gas discharge port communicated with the exhaust passage, and the explosion-proof valve is further provided with a sealing ring, the sealing ring is annularly arranged on the periphery of the gas discharge port and clamped between the active element and the valve body. The monitoring switch is provided with a first connection end and a second connection end, the first connection end is used to electrically connect with a battery of a battery pack, and the second connection end is used to electrically connect with a battery management system.

7. The explosion relief valve of claim 1, wherein The monitoring switch includes a switch body and a trigger portion movably connected with the switch body, and the switch body is provided with a control circuit.

8. The explosion relief valve according to any one of claims 1 to 7, characterized in that In the closed state, the trigger portion is away from the control circuit, the control circuit forms an open circuit, the monitoring switch is in the initial state, in the pressure relief state, the trigger portion abuts against the control circuit, the control circuit forms a closed circuit, and the monitoring switch is in the triggered state. The explosion-proof valve as claimed in any one of claims 1 to 8 is included.

9. A battery pack, characterized by, ​ 10. A vehicle characterized by comprising: A battery pack comprising the battery pack of claim 9.

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