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, a driving device and a monitoring switch; 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 monitoring switch and the driving device are arranged on the valve body, the output end of the driving device is connected to the movable part so as to control the movable part to be switched between the pressure relief state and the closed state, 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 use reliability of the explosion-proof valve is improved, so that the safety of the battery pack under various working conditions is guaranteed.

Description

TECHNICAL FIELD

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

[0002] Battery may face various abnormal conditions in use process, such as overcharge, overdischarge, short circuit, internal short circuit, high temperature environment and the like, these abnormal conditions can cause the internal pressure of battery to rise sharply, and then cause battery to bulge, leakage and even explosion and other serious safety accidents. In the related art, explosion-proof valve is arranged on battery pack, however, when internal and external pressure difference occurs in battery pack due to external environment of battery, it often causes explosion-proof valve to be opened by mistake, at this time, external impurities are easy to enter battery through explosion-proof valve, which affects the use of battery and even damages battery. SUMMARY

[0003] The utility model discloses a kind of explosion -proof valve, battery pack and vehicle, to improve the use reliability of explosion -proof valve, to ensure the safety of battery pack under various conditions.

[0004] To achieve the above object, the utility model provides an explosion -proof valve, which comprises:

[0005] A valve body is provided with an exhaust passage;

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

[0007] A driving device and a monitoring switch are arranged in the valve body, the output end of the driving device is connected to the movable element to control the switching of the movable element between the pressure relief state and the closed state, and the monitoring switch has an initial state adapted to the closed state and a trigger state for identifying the pressure relief state.

[0008] In an embodiment, the valve body is provided with a first avoiding port, the driving device is arranged outside the valve body, and the output end of the driving device acts on the movable element through the first avoiding port.

[0009] In an embodiment, the valve body includes a mounting portion and a protruding portion connected together, the first avoiding port is arranged at the end of the protruding portion away from the mounting portion, and the driving device is located outside the end of the protruding portion.

[0010] In an embodiment, the driving device includes a driving body and a connecting portion, the driving body is connected to the connecting portion, the connecting portion is connected to the mounting portion, and the driving body is arranged opposite to the first avoiding port along the movement direction of the movable element.

[0011] In an embodiment, the explosion-proof valve is further provided with a push rod, the valve body is provided with a second avoiding opening, the push rod is movably connected to the valve body and connected to the movable element through the second avoiding opening, the monitoring switch is located at the end of the push rod away from the movable element, in the closed state, one end of the push rod abuts against the movable element, and the other end abuts against the trigger part of the monitoring switch, in the pressure relief state, the push rod and the trigger part are spaced apart.

[0012] In an embodiment, the driving device is provided with a connecting part for connecting the valve body, the connecting part is provided with a through opening, the push rod is arranged in the through opening, and the trigger part is arranged opposite to the push rod along the movement direction of the push rod.

[0013] In an embodiment, the valve body comprises a mounting part and a protruding part connected to each other, the driving device is located outside the end of the protruding part away from the mounting part, the connecting part is connected to the mounting part, the second avoiding opening is arranged on the mounting part, and the push rod and the protruding part are arranged in parallel.

[0014] In an embodiment, the push rod is provided with an elastic element outside the periphery of the push rod, the push rod is provided with a limiting protruding part on the side of the periphery of the push rod, and the elastic element is clamped on the opposite sides of the connecting part and the limiting protruding part.

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

[0016] In an embodiment, the monitoring switch is provided with a third connecting end and a fourth connecting end, the third connecting end is used for electrically connecting with the storage battery of the battery pack, and the fourth connecting end is used for electrically connecting with the battery management system.

[0017] In an embodiment, the monitoring switch is mounted on the driving device.

[0018] The utility model also proposes a battery pack, the battery pack includes the explosion-proof valve as mentioned.

[0019] The utility model also proposes a vehicle, the vehicle includes the battery pack as mentioned.

[0020] The technical scheme of the utility model discloses valve body installs monitoring switch and drive arrangement, and monitoring switch can monitor the on-off control of movable element to exhaust passage, and drive arrangement can control movable element to switch between closed state and pressure relief state, when movable element is in closed state, monitoring switch is in initial state at this moment, can not trigger or send movable element in closed state signal to external controller, when the internal pressure of battery pack abnormally rises, movable element can be passively opened exhaust passage through air pressure difference, to pressure relief state, timely release internal excessively high pressure, monitoring switch monitors the activity of movable element, and then switches from initial state to trigger state, and generates trigger signal, provides external controller with current explosion-proof valve environment, to judge whether explosion-proof valve is mis-triggered, and then controls movable element to switch back to closed state in time through drive arrangement, avoids that external impurity invades battery pack through explosion-proof valve, causes battery pack damage, simultaneously, also can drive movable element to switch to pressure relief state through drive arrangement, realizes actively opening exhaust passage, and then can actively regulate and control internal pressure, prevents danger in advance, reduces the damage of battery pack in the early stage of abnormal occurrence, or, also can continue to control driving element to keep in pressure relief state through drive arrangement after internal gas is discharged to a certain degree, realizes discharging internal abnormal gas as far as possible, here, monitoring switch keeps in trigger state, can confirm that drive arrangement controls movable element to maintain in pressure relief state, guarantees that the state of explosion-proof valve is actively controllable, reduces the damage of battery pack, improves the use flexibility and reliability of explosion-proof valve, thereby improves the safety of battery pack under various working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to the structure shown in these drawings.

[0022] Figure 1 The structural schematic diagram of an embodiment of explosion-proof valve provided by the utility model is shown in the figure;

[0023] Figure 2 For Figure 1 The local enlarged view of A in the figure;

[0024] Figure 3 For Figure 1 The structural schematic diagram of another view of explosion-proof valve in the figure;

[0025] Figure 4For Figure 1 Structure diagram of another view of the explosion-proof valve;

[0026] Figure 5 For Figure 1 Sectional view of the valve body;

[0027] Figure 6 For Figure 1 Structure diagram of the monitoring switch.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 100, valve body; 110, mounting portion; 111, air vent; 112, second avoiding opening; 120, protruding portion; 121, first avoiding opening; 130, exhaust passage; 140, first spring; 200, movable piece; 210, guide rod; 211, limiting flange; 220, cover body;

[0030] 300, driving device; 310, driving body; 320, connecting portion; 330, through opening; 340, bolt; 350, protection cylinder; 360, first connecting end; 370, second connecting end;

[0031] 400, monitoring switch; 410, switch body; 420, triggering portion; 430, third connecting end; 440, fourth connecting end; 500, pushing rod; 510, limiting protruding portion; 520, elastic piece.

[0032] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0033] 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 fall within the protection scope of the utility model.

[0034] 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 specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0035] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, 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 present application.

[0036] In the prior art, the battery pack may face various abnormal situations during use, so that the battery pack is damaged due to a large pressure inside the battery pack. For this purpose, an explosion-proof valve is usually arranged on the battery pack to release the large pressure inside the battery pack. In the related art, the explosion-proof valve is a mechanical explosion-proof valve which is passively opened and closed by the large air pressure inside the battery pack. However, once the battery pack involves a complex external environment, the explosion-proof valve may be mistakenly opened, for example, when the vehicle is involved in water or enters a tunnel, the internal and external conditions of the battery pack change sharply, causing the explosion-proof valve to be mistakenly opened. If the vehicle is involved in water at this time, the battery pack will be flooded, which brings safety hazards to the battery pack. Similarly, such an explosion-proof valve needs a high pressure difference between the inside and outside of the battery pack to be opened. Before the battery pack generates a high pressure inside, the high-temperature gas inside the battery pack has been accumulated for a long time, which has caused damage to the battery. After the explosion-proof valve is opened, the pressure of the battery pack is quickly released, and then becomes a slow exhaust for a long time. However, at this time, the pressure difference between the inside and outside of the battery pack has decreased, and the explosion-proof valve is closed immediately. There is still some high-temperature and high-pressure gas remaining in the battery pack, which causes damage to the battery pack. In addition, for the explosion-proof valve applied to the vehicle, for example, when the vehicle enters the sleep state, the explosion-proof valve cannot reverse the wake-up function of the battery management system. Once the explosion-proof valve is mistakenly opened passively, the battery management system cannot identify the current state of the battery pack. For this purpose, a gas pressure sensor needs to be arranged in the battery pack to realize the wake-up function, thereby increasing the cost.

[0037] The utility model provides a kind of explosion-proof valve.

[0038] Please refer to Figures 1 to 3 In an embodiment of the present application, the explosion-proof valve comprises:

[0039] Valve body 100, exhaust passage 130 is arranged in valve body 100;

[0040] The movable element 200 is movably arranged in the exhaust passage 130 to have a closed state of blocking the exhaust passage 130 and a pressure relief state of conducting the exhaust passage 130.

[0041] The driving device 300 and the monitoring switch 400 are arranged in the valve body 100, the output end of the driving device 300 is connected to the movable element 200 to control the movable element 200 to switch between the pressure relief state and the closed state, and the monitoring switch 400 has an initial state adapted to the closed state and a trigger state for identifying the pressure relief state.

[0042] The technical scheme of the utility model installs the monitoring switch 400 and the driving device 300 in the valve body 100, the monitoring switch 400 can monitor the on-off control of the movable element 200 to the exhaust passage 130, the driving device 300 can control the movable element 200 to switch between the closed state and the pressure relief state, when the movable element 200 is in the closed state, the monitoring switch 400 is in the initial state at this time, which can not trigger or send a signal to the external controller that the movable element 200 is in the closed state, etc. When the internal pressure of the battery pack abnormally rises, the movable element 200 can passively open the exhaust passage 130 through the air pressure difference to the pressure relief state, timely release the internal excessively high pressure, the monitoring switch 400 monitors the activity of the movable element 200, and then switches from the initial state to the trigger state and generates a trigger signal, which is combined with the current environment of the explosion-proof valve by the external controller to determine whether the explosion-proof valve is mis-triggered, and then the driving device 300 timely controls the movable element 200 to switch back to the closed state to avoid external impurities invading the battery pack through the explosion-proof valve, causing damage to the battery pack. At the same time, the driving device 300 can also drive the movable element 200 to switch to the pressure relief state to actively open the exhaust passage 130, and then actively regulate the internal pressure to prevent the risk in advance and reduce the damage to the battery pack in the early stage of abnormal occurrence. Or, after the internal gas is discharged to a certain extent, the driving device 300 continues to control the driving element to remain in the pressure relief state to discharge the internal abnormal gas as much as possible. Here, the monitoring switch 400 remains in the trigger state, which can confirm that the driving device 300 controls the movable element 200 to maintain in the pressure relief state, actively controls the state of the explosion-proof valve, reduces the damage to the battery pack, improves the use flexibility and reliability of the explosion-proof valve, and improves the safety of the battery pack under various working conditions. In addition, when the equipment carrying the battery pack is in a dormant state, the monitoring switch 400 in the trigger state can also activate the equipment to realize alarm, so as to reduce the separately arranged gas pressure sensor and reduce the cost.

[0043] It can be understood that, compared with the original pure passive open-close explosion-proof valve, the explosion-proof valve of the embodiment has passive and active pressure relief modes. The active pressure relief mode realized by the driving device 300 can control the movable part 200 to maintain in the pressure relief state for a period of time after the abnormality in the battery pack and the exhaust gas are started, thereby reducing the accumulation of high-temperature and high-pressure gas in the battery pack and reducing the damage to the battery pack. Here, the monitoring switch 400 can correspondingly maintain in the triggered state, thereby confirming the reliability of the driving device 300 in driving the movable part 200 to the pressure relief state. Without loss of generality, various sensors can be arranged in the battery pack to monitor various parameters in the battery pack. On the one hand, once an abnormality occurs in a certain parameter, the movable part 200 can be switched to the pressure relief state by the driving device 300, so that the corresponding parameter in the battery pack returns to the normal range. In this process, the pressure difference between the inside and outside of the battery pack is not enough to passively switch the movable part 200 to the pressure relief state, thereby realizing the early protection of the battery pack through the active control of the movable part 200 by the driving device 300 and reducing the damage to the battery pack. On the other hand, when the movable part 200 in the pressure relief state is switched back to the closed state, the inside of the battery pack still has certain abnormal gas. At this time, the driving device 300 keeps the movable part 200 in the pressure relief state, so that the movable part 200 will not be passively reset to the closed state, thereby prolonging the pressure relief time. After the sensor detects that the parameters in the battery pack are in the normal value, the driving device 300 controls the movable part 200 to reset to the closed state.

[0044] It should be noted that the initial state of the monitoring switch 400 is adapted to the closed state of the movable part 200. The monitoring switch 400 in the initial state can not transmit a signal to the outside or can transmit a signal that the movable part 200 is in the closed state. The triggered state of the monitoring switch 400 can identify the pressure relief state of the movable part 200. The monitoring switch 400 in the triggered state can output a trigger signal to the outside. At this time, the monitoring switch 400 can be in a conduction state or in an open circuit state to be judged by an external controller that the monitoring switch 400 has been switched to the triggered state. The monitoring switch 400 monitors the movable part 200. The movable part 200 acting on the monitoring switch 400 can be direct abutment or interval identification, such as magnetic signal, sensing distance, etc. In addition, the exhaust passage 130 is still connected to the battery pack and can be connected to the outside. For the open-close control of the movable part 200 on the exhaust passage 130, the movable part 200 can perform open-close control on the exhaust passage 130 in the valve body 100 to realize the switching between the closed state and the pressure relief state. The movable part 200 can also perform open-close control on the opening of the exhaust passage 130 on the outer surface of the valve body 100 to realize the switching between the closed state and the pressure relief state of the movable part 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 present technical solution, a vehicle is introduced.

[0045] In an embodiment, please refer to Figure 1 , Figure 2 and Figure 5 , the valve body 100 is provided with a first avoiding port 121, the driving device 300 is arranged outside the valve body 100, and the output end of the driving device 300 acts on the movable piece 200 through the first avoiding port 121. It can be understood that the driving device 300 can control the movable piece 200 to move through the first avoiding port 121, realize the switching of the movable piece 200 between the pressure relief state and the closed state, so that the explosion-proof valve has the function of active pressure relief, guarantees the reliability of the explosion-proof valve, reduces the modification to the original valve body 100 and the movable piece 200, and is convenient for the subsequent maintenance and replacement of the driving device 300. It reduces the development difficulty and cost. At the same time, the driving device 300 is installed outside the exhaust passage 130, reduces the interference of the driving device 300 to the exhaust passage 130, guarantees the reliability and stability of the explosion-proof valve pressure relief. Without loss of generality, the explosion-proof valve is installed in the battery pack, the avoiding port is located at one side in the battery pack, and the driving device 300 is located in the battery pack, thereby avoiding the interference of the sundries outside the battery pack to the operation of the driving device 300, and guaranteeing the operation stability of the driving device 300. Of course, in other embodiments, the driving device 300 can also be arranged in the valve body 100, so as to protect the driving device 300 through the valve body 100, avoid the influence of the external environment on the operation of the driving device 300, or the driving device 300 can also be arranged at one side of the explosion-proof valve outside the battery pack,

[0046] Further, in the embodiment, please refer to Figure 1 , Figure 3 and Figure 5The valve body 100 comprises a mounting portion 110 and a protruding portion 120 connected with each other, the first avoiding opening 121 is arranged at the end of the protruding portion 120 away from the mounting portion 110, and the driving device 300 is located outside the end of the protruding portion 120. Without loss of generality, the movable element 200 comprises a guide rod 210 and a cover body 220 connected with each other, the guide rod 210 is movably arranged in the protruding portion 120, the cover body 220 is movably arranged in the mounting portion 110, the mounting portion 110 is provided with a gas leakage opening 111, the cover body 220 is used to open and close the gas leakage opening 111, and the driving device 300 can act on the guide rod 210 or the cover body 220. In the embodiment, the first avoiding opening 121 is arranged at the end of the protruding portion 120 away from the mounting portion 110, the driving device 300 acts on the guide rod 210, and the mounting portion 110 and the protruding portion 120 are arranged to provide a specific layout space for the driving device 300 and the guide rod 210, so that the components are orderly distributed on the valve body 100. At the same time, the driving device 300 is located outside the end of the protruding portion 120 away from the mounting portion 110 and is connected to the mounting portion 110, which is beneficial to the driving of the guide rod 210 by the driving device 300, such as simplifying the transmission structure of the driving device 300 for driving the guide rod 210, avoiding the interference of the driving device 300 on the cover body 220, ensuring the sealing performance of the cover body 220 for closing the gas leakage opening 111, and ensuring the mounting stability of the driving device 300 by using the stability of the mounting portion 110. At the same time, the guide rod 210 is a relatively central position of the movable element 200, the driving device 300 acts on the guide rod 210, which can ensure that the movable element 200 can actively open and close the gas leakage opening 111 along the original movement direction, and when the driving device 300 controls the explosion-proof valve to open and close, the explosion-proof valve can maintain stable use. Of course, in other embodiments, the first avoiding opening 121 can also be arranged in the mounting portion 110, and the driving device 300 controls the movable element 200 to switch between the closed state and the pressure relief state through the first avoiding opening 121 in the mounting portion 110.

[0047] Specifically, in the embodiment, please refer to Figures 1 to 4The driving device 300 comprises a driving body 310 and a connecting part 320, the driving body 310 is connected to the connecting part 320, the connecting part 320 is connected to the mounting part 110, and the driving body 310 is arranged opposite to the first avoiding opening 121 along the moving direction of the moving part 200. It can be understood that the moving direction of the output end of the driving device 300 is parallel to the moving direction of the moving part 200. The force generated by the driving device 300 can be directly and effectively transmitted to the moving part 200, the power loss caused by setting the transmission structure to change the output direction of the driving device 300 is reduced, and the energy efficiency utilization of the driving device 300 is improved. At the same time, the transmission structure for changing the action direction of the output end of the driving device 300 can also be reduced, the structure of the explosion-proof valve is simplified, and the cost and installation space are also reduced. At the same time, it can be understood that the driving body 310 is first mounted on the connecting part 320, the connecting part 320 is connected to the mounting part 110, and the driving body 310 acts on the guide rod 210 through the first avoiding opening 121. The connecting part 320 also has a through hole between the first avoiding opening 121 and the driving body 310, which is used for the driving body 310 to act on the guide rod 210. In this way, the external force received by the protruding part 120 can be reduced, the stability of the moving part 200 moving in the valve body 100 is ensured, the driving device 300 is supported by the mounting part 110, a stable structure is formed, and the driving body 310 will not be damaged, and the driving stability of the driving body 310 to the moving part 200 is ensured. Of course, in other embodiments, the moving direction of the output end of the driving device 300 can also intersect with the moving direction of the moving part 200. The driving device 300 changes the action direction through the transmission structure, and then controls the moving part 200 to switch between the closed state and the pressure relief state. Alternatively, the driving device 300 can be arranged as an integral component and directly connected to the mounting part 110, or the driving device 300 can also be mounted on the protruding part 120, and the protruding part 120 is stably connected to the mounting part 110 through other connecting structures.

[0048] For the driving device 300, in an embodiment, please refer to Figure 1 and Figure 4The driving device 300 is configured as a motor. Without loss of generality, the driving device 300 also has a structure for connecting the motor to the valve body 100, where the connecting structure can be part of the motor, i.e., integrated with the motor, or can be separately arranged from the motor to mount the motor to the valve body 100. In this way, the output end of the motor can act on the movable piece 200 through the avoiding opening 121 to provide the movable piece 200 with the required power to enable the movable piece 200 to move in the valve body 100, thereby actively switching between the pressure relief state and the closed state. At the same time, the motor has good controllability to accurately control the movement position and speed of the movable piece 200, ensuring that the opening degree of the exhaust passage 130 can be accurately adjusted according to actual needs, improving the working accuracy and reliability of the explosion-proof valve. Of course, in other embodiments, the driving device 300 can also be configured as a pneumatic cylinder or a hydraulic cylinder.

[0049] For the reset form of the movable piece 200, in an embodiment, please refer to Figure 5 The valve body 100 is also provided with a first spring 140, the end of the guide rod 210 away from the cover 220 is provided with a limiting flange 211, the first spring 140 is sleeved on the guide rod 210, and the two ends thereof are respectively abutted against the valve body 100 and the limiting flange 211. After the cover 220 is pushed up by the gas pressure to open the exhaust opening 111, the movable piece 200 moves towards the exhaust opening 111, the first spring 140 is compressed to an elastic compression state by the limiting flange 211, and correspondingly the movable piece 200 is in the pressure relief state. After the internal and external gas pressure difference of the battery pack is balanced, the first spring 140 will exert a force on the guide rod 210 in the closing direction due to its own elastic potential, prompting the guide rod 210 to drive the cover 220 to return to the position of closing the exhaust opening 111, thereby prompting the movable piece 200 to reset from the pressure relief state to the closed state. In this way, the driving device 300 only needs to exert a pushing force on the guide rod 210 to switch from the closed state to the pressure relief state, without the need to control the entire movement process of the guide rod 210, thereby reducing the connection form of the driving device 300 and the guide rod 210, and avoiding interference of the driving device 300 with the passive movement of the guide rod 210. In addition, in the closed state, the first spring 140 is also in an elastic state to ensure the stability of the movable piece 200 in the closed state, where the first spring 140 is configured as a compression spring. Of course, in other embodiments, the first spring 140 can also be configured as a tension spring, acting between the cover 220 and the mounting portion 110.

[0050] In an embodiment, please refer to Figure 1 , Figure 3 and Figure 4The driving device 300 is connected to the mounting portion 110 by screwing the bolts 340. It can be understood that screwing the bolts 340 can provide a large fastening force, so that the driving device 300 and the mounting portion 110 are tightly connected, effectively preventing the driving device 300 from loosening or shifting due to vibration, impact and other factors during the operation of the explosion-proof valve, ensuring the position stability of the driving device 300, thereby ensuring that the driving effect of the driving device 300 on the guide rod 210 can be continuously and stably exerted. At the same time, the installation process of screwing the bolts 340 is relatively simple, only the bolts 340 need to be passed through the corresponding mounting holes on the driving device 300 and the mounting portion 110, and then fastened by using nuts, which simplifies the installation difficulty and is convenient for subsequent maintenance and replacement. In addition, screwing can also be adaptively adjusted according to the relative position of the driving device 300 and the mounting portion 110, so as to ensure that the output end of the driving device 300 can be accurately aligned with the avoiding port, and the installation precision is ensured. Of course, in other embodiments, the driving device 300 can also be connected to the mounting portion 110 by welding.

[0051] Specifically, in the present embodiment, please refer to Figure 1 、 Figure 3 and Figure 4 , the connecting portion 320 is protrudingly arranged at the circumferential side of the driving body 310, and a plurality of bolts 340 are distributed on the periphery of the connecting portion 320. It can be understood that the bolts 340 and the protruding portion 120 are arranged in parallel, and the connecting portion 320 is also located at the exposed end of the protruding portion 120, which provides a mounting space for the installation of the driving body 310. Here, the bolts 340 are configured as long strip-shaped bolts 340 and are distributed along the periphery of the connecting portion 320 in the circumferential direction of the driving body 310. In this way, the plurality of bolts 340 can resist the shear force caused by the start of the driving body 310, thereby ensuring the stability of the driving body 310 on the connecting portion 320. At the same time, it can also disperse the stress position of the mounting portion 110, thereby reducing the probability of damage to the mounting portion 110. In addition, the connecting portion 320 is protrudingly arranged at the circumferential side of the driving body 310, and the exposed part of the connecting portion 320 is connected with the bolts 340, thereby reducing the interference of the bolts 340 on the driving body 310. Of course, in other embodiments, the bolts 340 can also be directly connected to the driving body 310.

[0052] For the connection structure of the bolts 340, in an embodiment, please refer to Figure 1 and Figure 3The bolt 340 is sleeved with a protection cylinder 350, which is clamped between the connecting portion 320 and the mounting portion 110. It can be understood that the protection cylinder 350 provides support for the connecting portion 320, so that the driving body 310, the connecting portion 320 and the convex portion 120 are spaced apart, avoiding the driving device 300 acting on the convex portion 120, and ensuring the stability of the movable part 200 moving in the moving direction. At the same time, the protection cylinder 350 also weakens the external force received by the bolt 340 in the axial direction, so that the bolt 340 is not easy to loosen when bearing external forces such as vibration and impact, and also avoids the bolt 340 from fatigue damage or fracture due to excessive local stress, thereby ensuring the connection stability of the driving device 300 and the mounting portion 110. In addition, the protection cylinder 350 can isolate the bolt 340 from the external environment, prevent the surface of the bolt 340 from being corroded, oxidized and damaged, and prolong the service life of the bolt 340. Of course, in other embodiments, the bolt 340 can also be connected to the mounting portion 110 in a bare state, or connected to the mounting portion 110 through an adapter structure.

[0053] For the setting of the monitoring switch 400, in an embodiment, please refer to Figure 1 , Figures 4 to 6The explosion-proof valve is further provided with a push rod 500, the valve body 100 is provided with a second avoiding opening 112, the push rod 500 is movably connected to the valve body 100 and connected to the movable element 200 through the second avoiding opening 112, and the monitoring switch 400 is located at an end of the push rod 500 away from the movable element 200. In the closed state, one end of the push rod 500 abuts against the movable element 200, and the other end abuts against the trigger part 420 of the monitoring switch 400. In the pressure relief state, the push rod 500 and the trigger part 420 are spaced apart. It can be understood that the monitoring switch 400 is located outside the valve body 100, and the structure of the original mechanical explosion-proof valve is not excessively changed. The opening and closing monitoring function of the explosion-proof valve is realized by providing the second avoiding opening 112 on the valve body 100 for the monitoring switch 400 to identify the state of the movable element 200, thereby reducing the modification of the original valve body 100 and the movable element 200, reducing the modification of the original explosion-proof valve mold, thereby reducing the development difficulty and cost, and facilitating the subsequent maintenance and replacement of the monitoring switch 400. At the same time, the monitoring switch 400 identifies the state of the movable element 200 through the push rod 500 through the second avoiding opening 112, the push rod 500 presents a synchronous movement state with the movable element 200, and the installation space provided by the driving device 300 can also guarantee the reliability of the monitoring switch 400 in identifying the state of the movable element 200. In the embodiment, the monitoring switch 400 identifies the push rod 500 in a contact manner. When the movable element 200 is in the closed state, the movable element 200 causes the push rod 500 to abut against the monitoring switch 400, so that the monitoring switch 400 can clearly perceive the position of the movable element 200, thereby accurately judging whether the explosion-proof valve is in the closed state. Correspondingly, in the process of switching the movable element 200 to the pressure relief state, the push rod 500 moves with the movable element 200, and the monitoring switch 400 can understand the dynamic process of the movable element 200 opening the exhaust passage 130 by detecting the displacement change of the push rod 500. After the movable element 200 opens the exhaust passage 130, the push rod 500 also moves away from the monitoring switch 400, so that the monitoring switch 400 obtains a clear signal, thereby switching from the initial state to the trigger state, to transmit the signal that the movable element 200 is in the pressure relief state. Of course, in other embodiments, the second avoiding opening 112 is arranged in a direction intersecting the movement direction of the movable element 200, and the monitoring switch 400 identifies the position of the movable element 200 to judge whether the movable element 200 is in the closed state or the pressure relief state, thereby switching between the initial state and the trigger state.

[0054] Further, in the embodiment, please refer to Figure 1 、 Figure 2 and Figure 4The driving device 300 is provided with a connecting portion 320 for connecting the valve body 100, the connecting portion 320 is provided with an over mouth 330, the push rod 500 is arranged in the over mouth 330, and the trigger portion 420 is arranged opposite to the push rod 500 along the activity direction of the push rod 500. For the connecting portion 320, refer to the above description about the driving device 300, which will not be repeated here. In this embodiment, the over mouth 330 is arranged on the connecting portion 320 to limit the activity direction of the push rod 500, so that the activity direction of the push rod 500 is parallel to the activity direction of the activity piece 200, thereby ensuring the reliability of the monitoring switch 400 in identifying the state of the activity piece 200 through the push rod 500, and further ensuring the reliability of the monitoring switch 400 in monitoring the opening and closing of the explosion-proof valve. Without loss of generality, the monitoring switch 400 and the driving device 300 are arranged on the same side, the explosion-proof valve is installed in the battery pack, the second avoiding opening 112 is located on one side in the battery pack, and the monitoring switch 400 is located in the battery pack, thereby avoiding the interference of foreign matters outside the battery pack with the operation of the monitoring switch 400, and ensuring the operation stability of the monitoring switch 400. Of course, in other embodiments, the monitoring switch 400 can also be arranged on the side of the explosion-proof valve outside the battery pack, or a guide structure is arranged on the valve body 100, the guide structure is arranged separately from the driving device 300, the push rod 500 is guided to move through the guide structure, and thereby the state of the activity piece 200 is fed back to the monitoring switch 400.

[0055] In an embodiment, please refer to Figure 1 、 Figure 3 and Figure 4The valve body 100 comprises a mounting portion 110 and a protruding portion 120 connected with each other, the driving device 300 is located outside the end of the protruding portion 120 away from the mounting portion 110, the connecting portion 320 is connected to the mounting portion 110, the second avoiding opening 112 is arranged on the mounting portion 110, and the pushing rod 500 and the protruding portion 120 are arranged in parallel. Without loss of generality, the movable element 200 comprises a guide rod 210 and a cover body 220 connected with each other, the guide rod 210 is movably arranged in the protruding portion 120, the cover body 220 is movably arranged on the mounting portion 110, the mounting portion 110 is provided with the air release opening 111, the cover body 220 is used to open and close the air release opening 111, and the pushing rod 500 can act on the guide rod 210 or the cover body 220. In the embodiment, the second avoiding opening 112 is arranged on the mounting portion 110, the pushing rod 500 acts on the cover body 220, and the mounting portion 110 and the protruding portion 120 are arranged to provide a specific layout space for the detection switch and the pushing rod 500, so that the components are orderly distributed on the valve body 100. Meanwhile, the connecting portion 320 is connected to the mounting portion 110, the mounting portion 110 provides good support for the stability of the connecting portion 320, the pushing rod 500 is arranged through the opening 330 on the connecting portion 320, and the activity stability of the pushing rod 500 can be ensured. In addition, the driving device 300 is located outside the end of the protruding portion 120 away from the mounting portion 110 and is connected to the mounting portion 110, the stability of the mounting portion 110 can be utilized to ensure the installation stability of the driving device 300, and the monitoring switch 400 and the driving device 300 do not interfere with each other, so that the use stability of the explosion-proof valve is ensured. Of course, in other embodiments, the second avoiding opening 112 can also be arranged on the protruding portion 120, the monitoring switch 400 recognizes the state of the movable element 200 through the second avoiding opening 112 on the protruding portion 120, and correspondingly, the driving device 300 is arranged on the mounting portion 110, the first avoiding opening 121 is arranged on the mounting portion 110, and the driving device 300 controls the state of the movable element 200 through the first avoiding opening 121 on the mounting portion 110.

[0056] For the reset of the pushing rod 500, in an embodiment, please refer to Figures 1 to 3The outer periphery of the push rod 500 is sleeved with an elastic member 520. The periphery of the push rod 500 is provided with a limiting protrusion 510 between the valve body 100 and the connecting portion 320. The elastic member 520 is clamped on the opposite sides of the connecting portion 320 and the limiting protrusion 510. After the movable element 200 is switched to the closed state, the elastic member 520 is compressed to an elastic compression state by the limiting protrusion 510. The corresponding monitoring switch 400 is in an initial state. At this time, the elastic member 520 has a tendency to push the push rod 500 to move towards the movable element 200. After the movable element 200 is switched to the pressure relief state, the elastic member 520 will exert a force on the push rod 500 towards the movable element 200 due to its elastic potential energy, so as to promote the push rod 500 to move to a position spaced from the monitoring switch 400, thereby promoting the monitoring switch 400 to also switch to a triggered state. In this way, the push rod 500 and the movable element 200 move synchronously, and the monitoring switch 400 only needs to monitor whether the push rod 500 is in the correct position when the movable element 200 is in the closed state, without the need to monitor the entire movement process of the push rod 500 in detail, thereby reducing the number of monitoring points and the complexity of the monitoring switch 400. In addition, in the closed state of the movable element 200, the push rod 500 abuts against the monitoring switch 400, and the elastic member 520 is compressed to an elastic state, which can ensure that the push rod 500 can move synchronously with the movable element 200 to automatically switch the monitoring switch 400 to the triggered state after the movable element 200 is switched to the pressure relief state. The elastic member 520 is configured as a compression spring. Of course, in other embodiments, the elastic member 520 can also be configured as a tension spring and arranged between the mounting portion 110 and the limiting protrusion 510.

[0057] For the sealing structure of the explosion-proof valve, in an embodiment, please refer to Figure 4 and Figure 5 The valve body 100 is further provided with a gas discharge port 111 communicating with the exhaust passage 130, and the explosion-proof valve is further provided with a sealing ring. The sealing ring is annularly arranged around the periphery of the gas discharge port 111 and clamped between the movable element 200 and the valve body 100. It can be understood that the sealing ring can effectively fill the gap between the movable element 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 due to gas intrusion. At the same time, by arranging the sealing ring on the gas discharge port 111, the external impurities can be separated at 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 element 200, the sealing ring can also reduce the friction and wear between the movable element 200 and the valve body 100, thereby ensuring 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.

[0058] In an embodiment, referring to Figure 1 and Figure 6 The monitoring switch 400 comprises a switch body 410 and a triggering part 420, the triggering part 420 is movably connected to the switch body 410, and the switch body 410 is provided with a control circuit; in the closed state, the triggering part 420 is away from the control circuit, the control circuit forms an open circuit, and the monitoring switch 400 is in the initial state; in the pressure relief state, the triggering part 420 abuts against the control circuit, the control circuit forms a closed circuit, and the monitoring switch 400 is in the 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, and the push rod 500 is in the state of abutting against the triggering part 420, so that the control circuit of the monitoring switch 400 forms an open circuit, and the monitoring switch 400 is in the initial state most of the time, which reduces the energy consumption of the monitoring switch 400, and at the same time, it can also avoid the monitoring switch 400 from transmitting signals outward in the initial state, thereby reducing the probability of false triggering. Once the movable part 200 of the explosion-proof valve is switched to the pressure relief state, the push rod 500 moves away from the monitoring switch 400 under the action of the elastic member 520, and is spaced apart from the triggering part 420, and the triggering part 420 can cause the control circuit to form a closed circuit, so that the monitoring switch 400 can transmit the monitoring signal outward, which can activate the battery management system in the dormant state, and at the same time, it will not change the relative relationship between the triggering part 420 and the control circuit due to slight vibration, thereby reducing the false triggering caused by external interference. Of course, in other embodiments, in the closed state, the triggering part 420 can abut against the control circuit under the action of the push rod 500, the control circuit forms a closed circuit, and the monitoring switch 400 is in the initial state; in the pressure relief state, the triggering part 420 is separated from the push rod 500 and away from the control circuit, and the control circuit forms an open circuit, and the monitoring switch 400 is in the triggered state.

[0059] In an embodiment, referring to Figure 1 and Figure 3The driving device 300 is provided with a first connecting end 360 and a second connecting end 370. The first connecting end 360 is used to be electrically connected with the storage battery of the battery pack, and the second connecting end 370 is used to be electrically connected with the battery management system. The driving device 300 is electrically connected with the storage battery of the battery pack through the first connecting end 360, so as to guarantee the stability of the driving device 300. After the battery management system receives the abnormal data signal in the battery pack, it is judged that the battery pack has the risk of thermal runaway, and then a control instruction is sent to the driving device 300 through the second connecting end 370, so as to make the driving device 300 push the movable part 200 to open the exhaust passage 130, complete the valve opening, and discharge the high-temperature gas in the battery pack. Correspondingly, when the battery management system receives the data in the battery pack returning to normal, it is judged that the environment in the battery pack has been stable, and then a control instruction is sent to the driving device 300 through the second connecting end 370, so as to make the driving device 300 control the movable part 200 to close the exhaust passage 130, complete the valve closing, and thus discharge the high-temperature gas to the greatest extent. Of course, in other embodiments, the first connecting end 360 can also be connected to other power sources of the vehicle instead of the storage battery of the battery pack, and the second connecting end 370 can also be connected to other control systems of the vehicle, such as the car system, instead of being directly connected to the battery management system.

[0060] For the way of monitoring the switch 400 to output the signal, in an embodiment, please refer to Figure 1 and Figure 3The monitoring switch 400 is provided with a third connecting end 430 and a fourth connecting end 440. The third connecting end 430 is electrically connected to the battery of the battery pack, and the fourth connecting end 440 is electrically connected to the battery management system. The monitoring switch 400 is electrically connected to the battery of the battery pack through the third connecting end 430, 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 400 can quickly detect the abnormality signal and transmit the fault information to the battery management system through the fourth connecting end 440. After receiving the fault signal, 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 safety accidents or control the driving device 300 to drive the movable part 200 to a corresponding state, thereby reducing the damage to the battery pack. At the same time, when the vehicle is in a dormant state, the battery still supplies power to the monitoring switch 400. Once the monitoring switch 400 is switched to a triggered state, the signal will be transmitted to the battery management system through the fourth connecting end 440, 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, thereby ensuring the safe use of the battery pack and reducing the cost of separately setting a sensor for waking up the battery management system. Of course, in other embodiments, the third connecting end 430 can be connected to other power sources of the vehicle instead of the battery of the battery pack, and the fourth connecting end 440 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.

[0061] In an embodiment, please refer to Figures 1 to 4 The monitoring switch 400 is installed on the driving device 300. As described above, the push rod 500 is movably arranged in the connecting portion 320, and the driving body 310 is located on the side of the connecting portion 320 away from the protruding portion 120. In this case, the monitoring switch 400 is installed on the driving device 300, that is, the monitoring switch 400 is connected to the outside of the driving body 310 and opposite to the push rod 500 in the moving direction of the movable part 200. In this way, the cooperation reliability between the monitoring switch 400 and the push rod 500 is ensured, so that the initial state and the triggered state of the monitoring switch 400 correspond to the closed state and the pressure relief state of the movable part 200. At the same time, the structure of the explosion-proof valve can be simplified, the compactness of the explosion-proof valve can be improved, and the space occupied by the explosion-proof valve can be reduced, thereby reducing the installation difficulty of the explosion-proof valve. Of course, in other embodiments, a connecting structure can be arranged outside the protruding portion 120, and the monitoring switch 400 can be installed on the connecting structure arranged on the protruding portion 120, or a supporting structure can be arranged on the mounting portion 110, the supporting structure is parallel and independent of the protruding portion 120, and the monitoring switch 400 is installed on the supporting structure.

[0062] The utility model discloses still put forward a kind of battery pack, the battery pack includes explosion-proof valve, the specific structure of the explosion-proof valve refers to above-mentioned embodiment, since the battery pack has adopted all technical solutions of above-mentioned all embodiments, therefore at least have all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration.Equipment, explosion-proof valve is installed on the lateral wall of battery pack, and can be communicated in battery pack interior.

[0063] The utility model discloses still put forward a kind of vehicle, the vehicle includes battery pack, the specific structure of the battery pack refers to above-mentioned embodiment, since the vehicle has adopted all technical solutions of above-mentioned all embodiments, therefore at least have all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration.

[0064] The above-mentioned is only the exemplary implementation of the utility model, and not therefore limit the patent range of the utility model, is in the technical concept of the utility model, utilizes the equivalent structural transformation of the utility model specification and attached drawing contents, or direct / indirectly applies in other relevant technical field all include in the patent protection range of the utility model.

Claims

1. An explosion relief valve, characterized in that The valve body is provided with a first avoiding port, the driving device is arranged outside the valve body, and the output end of the driving device acts on the movable element through the first avoiding port. The valve body comprises a mounting portion and a protruding portion connected with each other, the first avoiding port is arranged at the end of the protruding portion away from the mounting portion, and the driving device is located outside the end of the protruding portion. The driving device comprises a driving body and a connecting portion, the driving body is connected to the connecting portion, the connecting portion is connected to the mounting portion, and the driving body is arranged opposite to the first avoiding port along the movement direction of the movable element. The explosion-proof valve further comprises a push rod, the valve body is provided with a second avoiding port, the push rod is movably connected to the valve body and connected to the movable element through the second avoiding port, and the monitoring switch is located at the end of the push rod away from the movable element. In the closed state, one end of the push rod abuts against the movable element, and the other end abuts against the triggering portion of the monitoring switch, and in the pressure relief state, the push rod and the triggering portion are spaced apart.

2. The explosion relief valve of claim 1, wherein The driving device is provided with a connecting portion for connecting the valve body, the connecting portion is provided with a through port, the push rod is arranged in the through port, and the triggering portion is arranged opposite to the push rod along the movement direction of the push rod.

3. The explosion relief valve of claim 2, wherein, The valve body comprises a mounting portion and a protruding portion connected with each other, the driving device is located outside the end of the protruding portion away from the mounting portion, the connecting portion is connected to the mounting portion, the second avoiding port is arranged in the mounting portion, and the push rod and the protruding portion are arranged in parallel.

4. The explosion relief valve of claim 3, wherein And / or, an elastic element is sleeved on the outer periphery of the push rod, the push rod is provided with a limiting protrusion on the side thereof between the valve body and the connecting portion, and the elastic element is clamped on the opposite sides of the connecting portion and the limiting protrusion.

5. The explosion relief valve of claim 1, wherein The driving device is provided with a first connecting end and a second connecting end, the first connecting end is used to be electrically connected with the storage battery of the battery pack, and the second connecting end is used to be electrically connected with the battery management system. And / or, the monitoring switch is provided with a third connecting end and a fourth connecting end, the third connecting end is used to be electrically connected with the storage battery of the battery pack, and the fourth connecting end is used to be electrically connected with the battery management system.

6. The explosion relief valve of claim 5, wherein And / or, the monitoring switch is mounted on the driving device.

7. The explosion relief valve of claim 6, wherein The explosion-proof valve comprises the valve body according to any one of claims 1 to 8. The battery pack comprises the explosion-proof valve according to claim 9.

8. The explosion relief valve according to any one of claims 1 to 7, characterized in that ​ ​ ​ 9. A battery pack, characterized by, ​ 10. A vehicle characterized by comprising: ​

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