Explosion-proof valve, battery pack and vehicle

Abstract

The embodiment of the application provides an explosion-proof valve, a battery pack and a vehicle, and relates to the technical field of the battery pack. The explosion-proof valve provided by the application comprises a body, a valve cover and a control member, wherein the body is provided with a pressure relief port capable of being communicated with the inside of the battery pack; the valve cover is arranged on the pressure relief port, the control member is connected with the valve cover, and the control member can push the valve cover to move in a first direction to open the pressure relief port. By arranging the control member on the valve cover, the pressure relief port can be opened only by pushing the valve cover to move by the control member. When the explosion-proof valve is impacted by water flow in the water immersion or water floating working condition of the vehicle, the valve cover is effectively prevented from being opened by mistake due to the negative force caused by the backflow of the water flow. This improves the stability of the valve cover, avoids the valve cover from being easily opened by mistake due to external force, avoids the water or impurities in the outside from entering the battery pack, improves the waterproof performance and safety of the battery pack, and further improves the safety of the battery pack.

Description

Technical Field

[0001] This application relates to battery pack technology, and more particularly to an explosion-proof valve, a battery pack, and a vehicle. Background Technology

[0002] The core function of the explosion-proof valve is to quickly release the energy inside the battery pack to the outside in the event of a dangerous event such as a short circuit inside the battery pack. When the vehicle is wading through water or floating on water, the valve cover may accidentally open due to the impact of the water flow, allowing water or impurities from the outside to enter the battery pack, posing a safety hazard. Summary of the Invention

[0003] In view of this, this application provides an explosion-proof valve, a battery pack, and a vehicle, which can improve the stability of the explosion-proof valve and prevent the valve cover from being opened accidentally.

[0004] To achieve the above objectives, this application provides an explosion-proof valve, a battery pack, and a vehicle, employing the following technical solution:

[0005] In a first aspect, this application provides an explosion-proof valve, comprising:

[0006] The main body is provided with a pressure relief port;

[0007] Valve cover, which is installed over the pressure relief port;

[0008] A control element connected to the valve cover, the control element being capable of pushing the valve cover to move in a first direction to open the pressure relief port.

[0009] In one possible implementation, the explosion-proof valve provided in this application has the control element connected to a movable portion disposed on the valve cover facing the control element.

[0010] In one possible implementation, the explosion-proof valve provided in this application includes a drive unit as the control component;

[0011] The drive unit is connected to the body and is used to push the valve cover to move along the first direction to open the pressure relief port.

[0012] In one possible implementation, the explosion-proof valve provided in this application includes a connecting portion as the control component;

[0013] One end of the connecting part is connected to the driving part, and the connecting part is located on the side of the driving part facing the valve cover.

[0014] In one possible implementation, the explosion-proof valve provided in this application has a receiving cavity in its body, and the connecting part is movable in the receiving cavity along the first direction.

[0015] In one possible implementation, the explosion-proof valve provided in this application has a guide groove provided in the connecting part, and at least a portion of the movable part passes through the guide groove.

[0016] In one possible implementation, the explosion-proof valve provided in this application has a gap between the movable part and the bottom surface of the guide groove when the control member does not push the valve cover to move in the first direction.

[0017] In one possible implementation, the explosion-proof valve provided in this application has a sensing fluid disposed within the drive unit, the sensing fluid being configured to expand in volume upon heating to push the valve cover to move.

[0018] In one possible implementation, the explosion-proof valve provided in this application has a push diaphragm on the drive unit;

[0019] The diaphragm can deform under the volume expansion of the sensing fluid, thereby pushing the connecting part to move.

[0020] In one possible implementation, the explosion-proof valve provided in this application further includes a sensing structure in the drive unit;

[0021] Part of the sensing structure and the pushing diaphragm are arranged to form a fluid cavity, which is filled with the sensing fluid.

[0022] In one possible implementation, the explosion-proof valve provided in this application has a first surface of the actuating diaphragm facing the fluid cavity, the first surface of the actuating diaphragm being able to contact the sensing fluid, and a second surface of the actuating diaphragm being connected to the connecting portion.

[0023] In one possible implementation, the explosion-proof valve provided in this application includes a sensing structure comprising a first housing and a second housing connected to each other, the first housing and the second housing being disposed opposite to each other along the first direction.

[0024] In one possible implementation, the explosion-proof valve provided in this application has the first housing sleeved on the outside of the main body;

[0025] The pushing diaphragm is disposed between the first housing and the second housing, and the pushing diaphragm and the second housing form the fluid cavity.

[0026] In one possible implementation, the explosion-proof valve provided in this application has an injection hole in the second housing, which communicates with the fluid cavity.

[0027] In one possible implementation, the explosion-proof valve provided in this application further includes a sealing plug disposed at the injection port, the sealing plug being used to seal the fluid cavity.

[0028] In one possible implementation, the explosion-proof valve provided in this application further includes: an elastic element, the elastic element connecting the body and the valve cover, the elastic element being able to apply a force to the valve cover for closing the pressure relief port.

[0029] In one possible implementation, the explosion-proof valve provided in this application has a movable part on the valve cover, and an elastic element connects the body and the movable part. The elastic element is used to apply a force away from the valve cover to the movable part.

[0030] In one possible implementation, the explosion-proof valve provided in this application has an opening at one end of the body away from the drive unit that communicates with the receiving cavity, and the movable part passes through the opening.

[0031] In one possible implementation, the explosion-proof valve provided in this application has a first end of the elastic element fixedly connected to the body;

[0032] The second end of the elastic element can extend and retract along the first direction, and the second end of the elastic element is connected to the movable part.

[0033] In one possible implementation, the explosion-proof valve provided in this application has the elastic element configured as a spring, and the spring is located within the receiving cavity;

[0034] The spring is sleeved on the outside of the movable part, the first end of the spring is connected to the inner wall of the receiving cavity, and the second end of the spring is connected to the movable part.

[0035] In one possible implementation, the explosion-proof valve provided in this application has a first sealing portion on its body;

[0036] The first sealing part is used to be disposed between the body and the battery pack, and the first sealing part is disposed around the outer periphery of the pressure relief port.

[0037] In one possible implementation, the explosion-proof valve provided in this application has a second sealing part on its body;

[0038] The second sealing part is disposed between the body and the valve cover, and the second sealing part is arranged around the outer periphery of the pressure relief port.

[0039] In one possible implementation, the explosion-proof valve provided in this application includes a second sealing portion comprising at least two sealing elements;

[0040] The sealing element is arranged around the outer periphery of the pressure relief port and is used to be positioned between the body and the valve cover.

[0041] In one possible implementation, the explosion-proof valve provided in this application has at least two of the seals spaced apart in a second direction, which intersects with the first direction.

[0042] In one possible implementation, the explosion-proof valve provided in this application includes a sealing element comprising at least a sealing ring and / or a sealing boss.

[0043] The valve cover has a sealing groove on the side facing the body that corresponds to the sealing boss, and the sealing boss is used to be inserted into the sealing groove.

[0044] And / or, the sealing ring is disposed inside the sealing boss.

[0045] In one possible implementation, the explosion-proof valve provided in this application has at least one connecting lug on its body;

[0046] The main body is used for detachable connection to the battery pack via the connecting ear.

[0047] Secondly, this application provides a battery pack, including a battery pack body and the aforementioned explosion-proof valve, wherein the explosion-proof valve is disposed on the battery pack body.

[0048] Thirdly, this application provides a vehicle including the aforementioned battery pack or the aforementioned explosion-proof valve.

[0049] The explosion-proof valve provided in this application includes a body, a valve cover, and a control component. The body has a pressure relief port for communication with the inside of the battery pack. The valve cover is located on the pressure relief port, and the control component is connected to the valve cover. The control component can push the valve cover to move in a first direction to open the pressure relief port. By setting the control component on the valve cover, the pressure relief port can only be opened by pushing the valve cover with the control component. In the case of vehicle wading or floating in water, when water flow impacts the explosion-proof valve, it effectively prevents the valve cover from being accidentally opened due to the negative force caused by water backflow. This improves the stability of the valve cover, avoids the valve cover from being easily opened by external force, prevents external water or impurities from entering the battery pack, improves the waterproof performance and safety of the battery pack, and thus improves the safety of the battery pack.

[0050] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the technical solutions provided by this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0051] The specific embodiments of this application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of this application, and this application is not limited to the specific embodiments described below.

[0052] Figure 1 Schematic diagram of the explosion-proof valve provided in this application Figure 1 ;

[0053] Figure 2 Schematic diagram of the explosion-proof valve provided in this application Figure 2 ;

[0054] Figure 3 A partial structural diagram of the explosion-proof valve provided in this application installed on the battery pack;

[0055] Figure 4 This is a schematic diagram of the internal structure of the explosion-proof valve provided in this application;

[0056] Figure 5 This is a schematic diagram of the internal structure of the explosion-proof valve provided in this application with the valve cover in the open state.

[0057] Explanation of reference numerals in the attached figures:

[0058] 10. Battery pack; 100. Main body; 101. Pressure relief port; 102. Receiving cavity;

[0059] 200. Valve cover; 201. Sealing groove;

[0060] 300, Control component; 310, Drive unit; 3101, Fluid cavity; 311, First housing; 312, Second housing; 3121, Injection port; 313, Pushing diaphragm; 314, Sealing plug; 330, Connecting part; 331, Guide groove;

[0061] 320. Activities Department;

[0062] 400. Elastic components;

[0063] 500. First sealing part;

[0064] 600. Second sealing part; 610. Sealing ring; 620. Sealing boss;

[0065] 700. Connecting ear.

[0066] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0068] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0070] In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise specified precisely.

[0071] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0072] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0073] In recent years, with the rapid development of the electric vehicle industry, the battery pack, as its core component, is not only related to the performance and safety of electric vehicles, but also crucial to market competitiveness and sustainable development. Battery packs are typically equipped with explosion-proof valves, which are used for explosion-proof pressure relief in the event of thermal runaway or thermal events, and for waterproofing and ventilation in normal operating environments.

[0074] In conventional installations, the explosion-proof valve is horizontally mounted on the front or rear side of the battery pack. The valve consists of a body and a cover. The body is connected to the battery pack, and the cover can move relative to the body to release pressure inside the battery pack. When the vehicle is wading through or floating on water, the cover may also experience a negative force from the backflow of water after being impacted by the water flow, causing it to open accidentally. This allows external water or impurities to enter the battery pack through the opened valve, posing a safety hazard. Alternatively, the cover may have inertia, and during driving on bumpy roads or during acceleration and deceleration, the cover may open accidentally due to inertia.

[0075] Based on the aforementioned technical problems, this application provides an explosion-proof valve, a battery pack, and a vehicle. In this technical solution, the explosion-proof valve includes a body, a valve cover, and a control component. The body has a pressure relief port for communication with the inside of the battery pack. The valve cover is located on the pressure relief port, and the control component is connected to the valve cover. The control component can push the valve cover to move in a first direction to open the pressure relief port. By providing a control component on the valve cover, the pressure relief port can only be opened by pushing the valve cover with the control component. In situations where the vehicle is wading or floating in water, when water impacts the explosion-proof valve, it effectively prevents the valve cover from accidentally opening due to the negative force caused by the backflow of water. This improves the stability of the valve cover, prevents the valve cover from being easily opened by external forces, and prevents external water or impurities from entering the battery pack, thus improving the waterproof performance and safety of the battery pack, and consequently enhancing the safety of the battery pack.

[0076] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0077] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in the figure, an explosion-proof valve provided in this application includes a body 100, a valve cover 200, and a control component 300. The body 100 has a pressure relief port 101 that can communicate with the interior of a battery pack 10. The battery pack 10 is a prior art concept; typically, the battery pack 10 has a frame, and battery cell modules are disposed inside the frame. The body 100 is mounted on the frame of the battery pack 10, and the pressure relief port 101 communicates with the interior of the battery pack 10. This application does not limit the specific structure of the battery pack 10.

[0078] A valve cover 200 is provided over the pressure relief port 101 and is movable in the body 100 in a first direction to close or open the pressure relief port 101; see reference. Figure 3 As shown, in related technologies, the explosion-proof valve provided in this application can be horizontally mounted on the battery pack 10, and the valve cover 200 can move horizontally toward or away from the battery pack 10 to close or open the pressure relief port 101. The first direction in this application can be the direction toward the front or rear of the vehicle on a horizontal plane, and this application does not limit this.

[0079] The control element 300 is connected to the valve cover 200. The control element 300 can push the valve cover 200 to move in a first direction to open the pressure relief port 101.

[0080] By setting a control element 300 on the valve cover 200, the pressure relief port 101 can only be opened by pushing the valve cover 200 to move using the control element 300. When the vehicle is wading or floating in water, the valve cover 200 is effectively prevented from being opened by the negative force caused by the backflow of water when the water impacts the explosion-proof valve.

[0081] This improves the stability of the valve cover 200, prevents the valve cover 200 from being easily opened by external forces, prevents external water or impurities from entering the battery pack 10, improves the waterproof performance and safety of the battery pack 10, and thus improves the safety of the battery pack 10.

[0082] In one possible implementation, the control element 300 includes a connecting portion 330 and a driving portion 310 disposed at one end of the connecting portion 330.

[0083] The connecting part 330 is located on the side of the drive part 310 facing the valve cover 200.

[0084] The drive unit 310 is connected to the body 100. The drive unit 310 is used to apply force to the connection unit 330 to push the valve cover 200 to move in the first direction to open the pressure relief port 101.

[0085] The drive unit 310 is directly connected to the main body 100, which ensures the stability of the drive unit 310. When the valve cover 200 needs to be operated, the drive unit 310 transmits the force to the valve cover 200 stably through the connecting part 330. The direction of force transmission is clear, reducing the loss of force during transmission.

[0086] The main body 100 is provided with a receiving cavity 102, and the connecting part 330 can move along a first direction within the receiving cavity 102. By providing the receiving cavity 102, the connecting part 330 is disposed inside the receiving cavity 102, and the receiving cavity 102 can play a protective role for the connecting part 330. At the same time, the receiving cavity 102 restricts the displacement space of the connecting part 330, thereby improving the stability of the connecting part 330 when it moves.

[0087] In one possible implementation, an elastic element 400 is also included, which connects the movable portion 320 on the body 100 and the valve cover 200. The elastic element 400 can be used to apply a force to the valve cover 200 to close the pressure relief port 101.

[0088] By providing an elastic element 400 on the valve body 100 and applying a force to the valve cover 200 to close the pressure relief port 101 using the elastic element 400, the valve cover 200 is further effectively prevented from being accidentally opened due to the negative force caused by the backflow of water when the water flow impacts the explosion-proof valve during vehicle wading or floating conditions. Furthermore, it can also effectively prevent the pressure relief port 101 from being accidentally opened due to inertia of the valve cover 200.

[0089] In addition, when a thermal runaway event occurs in the battery pack, the control unit 300 drives the pressure relief port 101 to open. After a thermal runaway event occurs in the battery pack, the elastic element 400 applies a force to the valve cover 200 to close the pressure relief port 101, which can also close the pressure relief port 101 a second time, further preventing the explosion-proof valve from being opened accidentally.

[0090] The end of the main body 100 away from the drive unit 310 has an opening communicating with the receiving cavity 102, and the movable part 320 passes through the opening. It should be noted that the movable part 320 may be part of the valve cover 200 or may be fixed to the valve cover 200.

[0091] The first end of the elastic element 400 is fixedly connected to the body 100.

[0092] The second end of the elastic element 400 can extend and retract along the first direction, and the second end of the elastic element 400 is connected to the movable part 320. In this way, the force on the elastic element 400 is applied to the valve cover through the movable part 320. This can prevent the elastic element 400 from directly applying force to the valve cover 200, avoid stress concentration on the valve cover 200, and provide a certain degree of protection for the valve cover 200.

[0093] By providing a receiving cavity 102 on the main body 100, a specific movement space is provided for the movable part 320. The movable part 320 moves along a first direction within the receiving cavity 102, and its movement trajectory is restricted and guided by the receiving cavity 102, making the movement of the movable part 320 more precise and stable.

[0094] The end of the main body 100 furthest from the drive unit 310 has an opening communicating with the receiving cavity 102. The movable part 320 passes through the opening, providing a clear movement path for the movable part 320 and further ensuring the linearity and stability of its movement. Furthermore, the movable part 320's insertion through the opening is simple and direct, allowing operators to easily place it in the designated position without complex positioning and alignment operations. During maintenance or replacement of the movable part 320, it can also be easily disassembled and installed through this opening, greatly improving maintenance efficiency.

[0095] In the above embodiment, the end of the elastic element 400 near the valve cover 200 is the first end of the elastic element 400, which is fixedly connected to the body 100 to ensure the stability of the initial position of the elastic element 400. The end of the elastic element 400 away from the valve cover 200 is the second end of the elastic element 400, which can extend and retract in the first direction. The elastic element 400 can adjust its length by its own extension and retraction to ensure that the connection between the valve cover 200 and the body 100 always maintains a certain preload or a suitable fit. This ensures that the elastic element 400 can apply a force to the valve cover 200 to close the pressure relief port 101. Specifically, the elastic element 400 always applies a pulling force toward the movable part 320, so that the movable part 320 is subjected to a pulling force away from the valve cover 200, thereby closing the pressure relief port 101.

[0096] In one possible implementation, refer to Figure 4 and Figure 5 As shown, the elastic element 400 is configured as a spring, which is located inside the receiving cavity 102.

[0097] The spring is sleeved on the outside of the movable part 320, with the first end of the spring connected to the inner wall of the receiving cavity 102 and the second end of the spring connected to the movable part 320.

[0098] In the above embodiment, the spring is sleeved on the outside of the movable part 320. The first end of the spring is fixedly connected to the inner wall of the receiving cavity 102, and the second end of the spring is fixedly connected to the side wall of the movable part 320. Here, the fixed connection between the first end of the spring and the inner wall of the receiving cavity 102 can be achieved by welding or snap-fitting, ensuring that the first end of the spring and the inner wall of the receiving cavity 102 do not move relative to each other. Similarly, the fixed connection between the second end of the spring and the side wall of the movable part 320 can also be achieved by welding, snap-fitting, or hooking, ensuring that the second end of the spring and the movable part 320 do not move relative to each other. When the movable part 320 moves in the first direction, the spring will undergo elastic deformation as the movable part 320 moves. Specifically, the spring is always in a compressed state, and the second end of the spring always provides the movable part 320 with a spring force away from the valve cover 200, thereby stabilizing the valve cover 200 and further sealing the pressure relief port 101.

[0099] In the first direction, the first end of the connecting part 330 is connected to the driving part 310, and the second end of the connecting part 330 is close to the moving part 320.

[0100] In the above embodiment, the first end of the connecting part 330 is connected to the driving part 310, so that the driving force generated by the driving part 310 can directly act on the connecting part 330. Since the second end of the connecting part 330 is close to the movable part 320, when the driving part 310 drives the connecting part 330 to move, the connecting part 330 can effectively transmit this force to the movable part 320, thereby driving the movable part 320 to move along the first direction. This direct force transmission method reduces force transmission loss and ensures that the movable part 320 can obtain sufficient power to perform the corresponding action. Effective force transmission can ensure that the valve cover 200 can be opened or closed quickly in a short time, improving the dynamic performance and response speed of the valve cover 200. By setting the connecting part 330, the rigidity of the structure is increased, the deformation resistance of the structure is improved, a relatively stable mechanical structure is formed, and safety is further improved.

[0101] In one possible implementation, the connecting part 330 is provided with a guide groove 331, and at least a portion of the movable part 320 passes through the guide groove 331.

[0102] In the above embodiment, by providing a guide groove 331 on the connecting part 330, a portion of the movable part 320 is embedded therein, which can ensure that the movable part 320 always moves along a predetermined trajectory during the movement, thereby improving stability; in addition, the presence of the guide groove 331 increases the contact area between the connecting part 330 and the movable part 320, thereby dispersing stress concentration points and improving the seismic performance of the entire structure.

[0103] In one possible implementation, when the drive unit 310 does not apply force to the connecting part 330, or when the control member 300 does not push the valve cover 200 to move, there is a gap between the movable part 320 and the bottom surface of the guide groove 331 in the first direction.

[0104] In the above embodiments, reference is made to Figure 4 As shown, when the drive unit 310 does not apply force to the connecting part 330, there is a gap between the movable part 320 and the bottom surface of the guide groove 331. This prevents direct contact between the two, reducing friction. The gap also allows the movable part 320 a certain degree of freedom within the guide groove 331, enabling adjustment of its position and improving adaptability. Furthermore, the gap between the movable part 320 and the bottom surface of the guide groove 331 acts as a buffer zone. When the drive unit 310 is subjected to fluctuating driving forces due to unstable factors, the gap ensures that the connecting part 330 and the movable part 320 do not contact each other, thereby preventing the valve cover 200 from opening accidentally.

[0105] In one possible implementation, a sensing fluid is provided inside the drive unit 310, and the sensing fluid is configured to expand in volume when heated to push the connecting part 330 to move. A pushing diaphragm 313 is provided on the drive unit 310.

[0106] The diaphragm 313 can deform under the volume expansion of the sensing fluid, thereby driving the connecting part 330 to move.

[0107] In the above embodiment, the sensing fluid expands when heated, which in turn pushes the diaphragm 313 to move the connecting part 300. This structure is simple and easy to maintain.

[0108] In one possible implementation, the drive unit 310 further includes a sensing structure, a portion of which, together with the push diaphragm 313, forms a fluid cavity 3101, which is filled with sensing fluid.

[0109] The first surface of the diaphragm 313 is pushed toward the fluid cavity 3101, and the first surface of the diaphragm 313 can contact the induced fluid in the fluid cavity 3101. The second surface of the diaphragm 313 is connected to the movable part 320.

[0110] In the above embodiment, the sensing structure is filled with a sensing fluid that exhibits thermal expansion and contraction characteristics. When the temperature rises, the sensing fluid expands, causing the diaphragm 313 to deform, thereby moving the movable part 320. During vehicle operation, if the internal temperature of the battery pack 10 rises abnormally (e.g., due to overheating or thermal runaway), the expansion of the sensing fluid will rapidly push the movable part 320, opening the valve cover 200 of the explosion-proof valve to release pressure. This design ensures rapid response under high-temperature conditions, effectively preventing safety accidents caused by overheating of the battery pack 10. By selecting an appropriate sensing fluid and designing the sensing structure, the degree of deformation of the diaphragm 313 can be precisely controlled, thereby achieving precise adjustment of the opening pressure and opening time of the explosion-proof valve. This precise control capability allows the explosion-proof valve to be adjusted according to specific needs, improving the system's adaptability and reliability. Since the sensing fluid only expands and pushes the movable part 320 when it reaches a certain temperature, slight temperature fluctuations will not cause the valve cover 200 of the explosion-proof valve to open accidentally during daily use. During normal vehicle operation, even changes in ambient temperature will not cause the explosion-proof valve cover 200 to malfunction. This reduces unnecessary maintenance work and costs due to misoperation, and also lowers the safety risks introduced by misoperation.

[0111] In practice, the effective operating temperature range of the sensing fluid is set between -40 degrees Celsius and 90 degrees Celsius to ensure that the sensing fluid does not expand under normal conditions and will not push the movable part 320 to move. When the temperature of the battery pack 10 exceeds 90 degrees Celsius, it means that a safety accident caused by overheating of the battery pack 10 has occurred. At this time, the sensing fluid expands rapidly, thereby driving the movable part 320 to move and opening the valve cover 200 to release pressure.

[0112] Of course, the force exerted by the sensing fluid on the diaphragm 313 after expansion should be greater than the force exerted by the elastic element 400 on the movable part 320 to ensure that the valve cover 200 can open after the sensing fluid expands. In the explosion-proof valve provided in this embodiment, under equilibrium conditions or when thermal runaway has not occurred, the force exerted by the elastic element 400 on the movable part 320 can close the pressure relief port 101. At this time, if the vehicle is submerged or floating in water, the valve cover 200 of the explosion-proof valve will also be subjected to a negative force caused by the backflow of water. This negative force is opposite to the force exerted by the elastic element 400 on the movable part 320, and it is necessary to ensure that the magnitude of the force exerted by the elastic element 400 on the movable part 320 is greater than the magnitude of the negative force caused by the backflow of water. This part can be determined experimentally in related technologies, and this embodiment does not impose specific limitations on the force exerted by the elastic element 400 on the movable part 320. Furthermore, if a thermal runaway event occurs while the vehicle is wading or floating in water, the force exerted by the expanded induced fluid on the diaphragm 313 acts on the movable part 320. The movable part 320 drives the elastic element 400 to continue compressing. At this time, it is necessary to ensure that the force exerted by the diaphragm 313 on the movable part 320 is greater than the force exerted by the elastic element 400 on the movable part 320, to ensure that the pressure relief port 101 can open normally in the event of a thermal runaway event while the vehicle is wading or floating in water. Alternatively, in another situation, when the vehicle is wading or floating in water, the water flow will directly impact the valve cover 200 of the explosion-proof valve. At this time, the water flow exerts a force on the valve cover in the direction of the control element 300. The force exerted by the diaphragm 313 on the movable part 320 should be greater than the sum of the force exerted by the water flow on the valve cover in the direction of the control element 300 and the force exerted by the elastic element 400 on the movable part 320, to ensure that the pressure relief port 101 can open normally.

[0113] In one possible implementation, the sensing structure includes a first housing 311 and a second housing 312 connected to each other, the first housing 311 and the second housing 312 being disposed opposite to each other along a first direction.

[0114] In the above embodiments, a modular design is achieved by dividing the sensing structure into a first housing 311 and a second housing 312 that are connected to each other and arranged opposite to each other along a first direction.

[0115] This design simplifies the assembly and maintenance of explosion-proof valves. During production, the first housing 311 and the second housing 312 can be manufactured and tested separately before assembly, improving production efficiency and quality control convenience. During maintenance, if a part malfunctions, the corresponding housing can be replaced individually, reducing repair costs and time. The relatively independent first housing 311 and second housing 312 can be produced using different manufacturing processes, such as injection molding and machining. Selecting the most suitable manufacturing process based on the shape and requirements of different housings can improve production efficiency and product quality.

[0116] In one possible implementation, the first housing 311 is fitted onto the outside of the body 100.

[0117] The push diaphragm 313 is disposed between the first housing 311 and the second housing 312, and the push diaphragm 313 and the second housing 312 form a fluid cavity 3101.

[0118] In the above embodiments, the fitting relationship between the first housing 311 and the body 100 makes the entire explosion-proof valve structure more compact, reduces the number of parts, simplifies the assembly process, and improves production efficiency. Furthermore, by fitting the first housing 311 onto the outside of the body 100, an additional protective layer is formed, which better protects the internal actuating diaphragm 313 and fluid chamber 3101, helping to maintain the sealing of the internal fluid, preventing leakage, and improving the durability and reliability of the explosion-proof valve.

[0119] In one possible implementation, the second housing 312 is provided with an injection hole 3121, which communicates with the fluid cavity 3101.

[0120] In the above embodiment, by providing an injection hole 3121 on the second housing 312 and communicating with the fluid cavity 3101, the sensing fluid can be conveniently filled or replaced through the injection hole 3121 when assembling or maintaining the explosion-proof valve.

[0121] During production, an appropriate amount of sensing fluid can be precisely injected into the fluid chamber 3101 through the injection port 3121 to ensure the normal operation of the explosion-proof valve. In subsequent maintenance, if the sensing fluid needs to be replaced due to prolonged use or other reasons, this can also be done through the injection port 3121 without disassembling the entire drive unit 310, simplifying the maintenance process and reducing maintenance costs.

[0122] In one possible implementation, a sealing plug 314 is also included. The sealing plug 314 is disposed at the injection port 3121 and is used to seal the fluid cavity 3101. By providing the sealing plug 314 at the injection port 3121, the fluid cavity 3101 can be effectively sealed, preventing leakage of the induced fluid and the entry of external impurities. The sealing plug 314 can provide a reliable seal, avoiding failure of the explosion-proof valve due to leakage, thereby ensuring the safety and performance of the battery pack 10.

[0123] In one possible implementation, the body 100 has a first sealing portion 500.

[0124] The first sealing part 500 is disposed between the body 100 and the battery pack 10, and the first sealing part 500 is arranged around the outer periphery of the pressure relief port 101. Specifically, the first sealing part 500 can be a rubber ring. By providing the first sealing part 500 on the body 100 and installing it between the body 100 and the battery pack 10, especially around the outer periphery of the pressure relief port 101, it is possible to effectively prevent gas, liquid, or other substances inside the battery pack 10 from leaking into the external environment. During the operation of the electric vehicle, if thermal runaway or overcharging occurs inside the battery pack 10, a large amount of gas may be generated or harmful liquids may leak out. The presence of the first sealing part 500 ensures that these substances do not leak from the pressure relief port 101, thereby protecting the safety of surrounding vehicle components and passengers, and also helps to maintain stable pressure inside the battery pack 10, ensuring the normal operation of the explosion-proof valve. Furthermore, during vehicle operation, the explosion-proof valve is affected by vehicle vibration and bumps. The first sealing part 500 can provide better support and fixation, reducing the possibility of the explosion-proof valve loosening or shifting due to vibration, thereby ensuring its normal operation and improving the installation stability and reliability of the explosion-proof valve.

[0125] In one possible implementation, a second sealing portion 600 is provided on the main body 100.

[0126] The second sealing part 600 is disposed between the body 100 and the valve cover 200, and the second sealing part 600 is arranged around the outer periphery of the pressure relief port 101.

[0127] In the above embodiment, the second sealing part 600 serves as an additional protective layer, preventing external impurities and moisture from entering the interior of the body 100. The second sealing part 600 prevents external substances from intruding into the interior of the body 100, protecting the internal sensing fluid and moving parts from contamination and corrosion, extending the service life of the explosion-proof valve, and ensuring stable operation of the explosion-proof valve in various environments, thus improving its overall protective performance. Furthermore, the second sealing part 600 ensures a tight seal between the valve cover 200 and the body 100.

[0128] In the specific implementation, refer to Figure 5As shown, the second sealing part 600 includes at least two seals.

[0129] A seal is disposed around the outer periphery of the pressure relief port 101 and is used to position the body 100 between the valve cover 200. By providing at least two seals, the sealing performance between the body 100 and the valve cover 200 can be further improved.

[0130] Continue to refer to Figure 5 As shown, at least two seals are spaced apart in a second direction, which is perpendicular to the first direction. By providing at least two seals spaced apart in the second direction, a multi-seal structure is formed. Even if some seals are damaged or aged, the other seals can still function to maintain the overall sealing performance of the explosion-proof valve, thereby improving the safety and reliability of the battery pack 10.

[0131] In one possible implementation, the seal includes at least a sealing ring 610 and a sealing boss 620.

[0132] The valve cover 200 has a sealing groove 201 on the side facing the body 100, which corresponds to the sealing boss 620. The sealing boss 620 is used to be inserted into the sealing groove 201.

[0133] The sealing ring 610 is located inside the sealing boss 620. The sealing ring 610 can be a rubber ring.

[0134] In the above embodiment, a double seal is achieved by setting a sealing ring 610 and a sealing boss 620, and by providing a sealing groove 201 corresponding to the sealing boss 620 on the side of the valve cover 200 facing the body 100. The combination of the sealing ring 610 and the sealing boss 620 can form a reliable sealing connection between the valve cover 200 and the body 100. The sealing ring 610 can fill the gap between the valve cover 200 and the body 100, preventing the leakage of liquid or gas; the sealing boss 620 is inserted into the sealing groove 201, further enhancing the stability and reliability of the seal, effectively preventing external substances from entering the battery pack 10, and improving the safety and protection performance of the battery pack 10. In addition, due to the presence of the sealing boss 620 and the sealing groove 201, during the manufacturing process, workers can easily align the valve cover 200 with the body 100, insert the sealing boss 620 into the sealing groove 201, and then install the sealing ring 610 to complete the assembly of the explosion-proof valve, improving production efficiency.

[0135] In one possible implementation, the body 100 has at least one connecting ear 700.

[0136] The main body 100 is detachably connected to the battery pack 10 via the connecting ear 700.

[0137] In the above embodiments, in specific implementation, the number of connecting ears 700 can be set to multiple, and the multiple connecting ears 700 are evenly arranged on the outer periphery of the body 100 to avoid stress concentration and improve reliability. The connecting ears 700 can be bolted to the body 100, which improves the ease of installation and reduces the difficulty of subsequent maintenance.

[0138] In one possible implementation, this application provides a battery pack, including a battery pack body and the aforementioned explosion-proof valve, wherein the explosion-proof valve is disposed on the battery pack body. The specific structure of the explosion-proof valve has been described above and will not be repeated here. The battery pack provided by this application possesses all the technical effects of the aforementioned explosion-proof valve, preventing external water or impurities from entering the battery pack, thus improving the waterproof performance and safety of the battery pack, and consequently enhancing the safety of the battery pack.

[0139] This application also provides a vehicle including the aforementioned battery pack; or the aforementioned explosion-proof valve. The battery pack can be used to power the vehicle. The vehicle in this application can refer to a large vehicle, a small vehicle, a special-purpose vehicle, etc. For example, according to vehicle type, the vehicle in this application can be a sedan, an off-road vehicle, a multi-purpose vehicle (MPV), or other types of vehicles. This application does not limit this.

[0140] The implementation principle of an explosion-proof valve, battery pack, and vehicle according to an embodiment of this application is as follows: The explosion-proof valve provided in this application includes a body 100, a valve cover 200, and a control component 300. The body has a pressure relief port 101 that can communicate with the inside of the battery pack. The valve cover 200 is placed over the pressure relief port 101. The control component 300 is connected to the valve cover 200 and can push the valve cover 200 to move in a first direction to open the pressure relief port 101. By setting the control component 300 on the valve cover 200, the pressure relief port 101 can only be opened by pushing the valve cover 200 with the control component 300. In the case of vehicle wading or floating in water, when water flow impacts the explosion-proof valve, it effectively prevents the valve cover 200 from being accidentally opened due to the negative force caused by the backflow of water. This improves the stability of the valve cover 200, avoids the valve cover 200 from being easily opened by external force, prevents external water or impurities from entering the battery pack, improves the waterproof performance and safety of the battery pack, and thus improves the safety of the battery pack.

[0141] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein.

[0142] The embodiments in this application are intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed in this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0143] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An explosion-proof valve, characterized in that, include: The main body (100) has a pressure relief port (101). Valve cover (200) is provided on the pressure relief port (101); A control element (300) is connected to the valve cover (200) and the control element (300) can push the valve cover (200) to move in a first direction to open the pressure relief port (101).

2. The explosion-proof valve according to claim 1, characterized in that, The control unit (300) includes a drive unit (310); The drive unit (310) is connected to the body (100) and is used to push the valve cover (200) to move along the first direction to open the pressure relief port (101).

3. The explosion-proof valve according to claim 2, characterized in that, The control element (300) includes a connecting part (330); One end of the connecting part (330) is connected to the driving part (310), and the connecting part (330) is located on the side of the driving part (310) facing the valve cover (200).

4. The explosion-proof valve according to claim 3, characterized in that, The main body (100) is provided with a receiving cavity (102), and the connecting part (330) can move in the receiving cavity (102) along the first direction.

5. The explosion-proof valve according to claim 4, characterized in that, The control element (300) is connected to the movable part (320) provided on the valve cover (200) facing the side of the control element (300).

6. The explosion-proof valve according to claim 5, characterized in that, The connecting part (330) is provided with a guide groove (331), and at least a portion of the movable part (320) passes through the guide groove (331).

7. The explosion-proof valve according to claim 6, characterized in that, In the first direction, when the control member (300) does not push the valve cover (200) to move, there is a gap between the movable part (320) and the bottom surface of the guide groove (331).

8. The explosion-proof valve according to claim 3, characterized in that, The drive unit (310) is provided with a sensing fluid, which is configured to expand in volume when heated to push the valve cover (200) to move.

9. The explosion-proof valve according to claim 8, characterized in that, A pushing diaphragm (313) is provided on the driving part (310). The pushing diaphragm (313) can deform under the volume expansion of the sensing fluid, thereby pushing the connecting part (330) to move.

10. The explosion-proof valve according to claim 9, characterized in that, The drive unit (310) also includes a sensing structure; Part of the sensing structure and the pushing diaphragm (313) are arranged to form a fluid cavity (3101), which is filled with the sensing fluid.

11. The explosion-proof valve according to claim 10, characterized in that, The first surface of the pushing diaphragm (313) faces the fluid cavity (3101), the first surface of the pushing diaphragm (313) can contact the sensing fluid, and the second surface of the pushing diaphragm (313) is connected to the connecting part (330).

12. The explosion-proof valve according to claim 10, characterized in that, The sensing structure includes a first housing (311) and a second housing (312) connected to each other, the first housing (311) and the second housing (312) being disposed opposite to each other along the first direction.

13. The explosion-proof valve according to claim 12, characterized in that, The first housing (311) is fitted onto the outside of the body (100); The pushing diaphragm (313) is disposed between the first housing (311) and the second housing (312), and the pushing diaphragm (313) and the second housing (312) form the fluid cavity (3101).

14. The explosion-proof valve according to claim 13, characterized in that, The second housing (312) is provided with an injection hole (3121), which is in communication with the fluid cavity (3101).

15. The explosion-proof valve according to claim 14, characterized in that, It also includes a sealing plug (314) disposed at the injection port (3121) for sealing the fluid cavity (3101).

16. The explosion-proof valve according to claim 5, characterized in that, Also includes: An elastic element (400) connects the body (100) and the valve cover (200), and the elastic element (400) can be used to apply a force to the valve cover (200) to close the pressure relief port (101).

17. The explosion-proof valve according to claim 16, characterized in that, The elastic element (400) connects the body (100) and the movable part (320), and the elastic element (400) is used to apply a force away from the valve cover (200) to the movable part (320).

18. The explosion-proof valve according to claim 16, characterized in that, The main body (100) has an opening at one end away from the drive part (310) that communicates with the receiving cavity (102), and the movable part (320) passes through the opening.

19. The explosion-proof valve according to claim 16, characterized in that, The first end of the elastic element (400) is fixedly connected to the body (100); The second end of the elastic element (400) can extend and retract along the first direction, and the second end of the elastic element (400) is connected to the movable part (320).

20. The explosion-proof valve according to claim 16, characterized in that, The elastic element (400) is configured as a spring, and the spring is located within the receiving cavity (102); The spring is sleeved on the outside of the movable part (320), the first end of the spring is connected to the inner wall of the receiving cavity (102), and the second end of the spring is connected to the movable part (320).

21. The explosion-proof valve according to any one of claims 1-20, characterized in that, The body (100) has a first sealing part (500); The first sealing part (500) is disposed between the body (100) and the battery pack (10), and the first sealing part (500) is disposed around the outer periphery of the pressure relief port (101).

22. The explosion-proof valve according to any one of claims 1-20, characterized in that, The main body (100) is provided with a second sealing part (600). The second sealing part (600) is disposed between the body (100) and the valve cover (200), and the second sealing part (600) is arranged around the outer periphery of the pressure relief port (101).

23. The explosion-proof valve according to claim 22, characterized in that, The second sealing part (600) includes at least two sealing elements; The sealing element is arranged around the outer periphery of the pressure relief port (101) and is used to be disposed between the body (100) and the valve cover (200).

24. The explosion-proof valve according to claim 23, characterized in that, At least two of the seals are spaced apart in a second direction, which intersects the first direction.

25. The explosion-proof valve according to claim 24, characterized in that, The seal includes at least a sealing ring (610) and / or a sealing boss (620). The valve cover (200) has a sealing groove (201) on the side facing the body (100) that corresponds to the sealing boss (620), and the sealing boss (620) is used to be inserted into the sealing groove (201); And / or, the sealing ring (610) is disposed inside the sealing boss (620).

26. The explosion-proof valve according to any one of claims 1-20, characterized in that, The body (100) has at least one connecting ear (700); The body (100) is detachably connected to the battery pack (10) via the connecting ear (700).

27. A battery pack, characterized in that, It includes a battery pack body and an explosion-proof valve as described in any one of claims 1-26, wherein the explosion-proof valve is disposed on the battery pack body.

28. A vehicle, characterized in that, Includes the battery pack as described in claim 27, or the explosion-proof valve as described in any one of claims 1-26.

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