An explosion-proof valve protection cover, a battery pack and a vehicle

Abstract

The application provides an explosion-proof valve protection cover, a battery pack and a vehicle. The explosion-proof valve protection cover comprises a protection cover body, and the protection cover body comprises a buffer cavity. The buffer cavity has an opening, and the bottom of the buffer cavity along a first direction is provided with a receiving part. The receiving part is used for accommodating liquid entering the buffer cavity. In the application, the explosion-proof valve protection cover can be used to cover the explosion-proof valve. If the explosion-proof valve is abnormally opened, and external liquid enters the battery pack from the opening of the explosion-proof valve, since the explosion-proof valve protection cover covers the explosion-proof valve, the liquid cannot directly enter the inside of the battery pack, but is first accumulated on the receiving part in the buffer cavity of the protection cover body under the action of gravity, thereby reducing the risk of damage of the battery pack caused by the liquid directly entering the inside of the battery pack, and ensuring the safety performance of the battery pack.

Description

Technical Field

[0001] This application belongs to the field of battery pack technology, specifically relating to an explosion-proof valve protective cover, a battery pack, and a vehicle. Background Technology

[0002] As a key component to ensure the safety performance of battery packs, explosion-proof valves are usually installed on the battery pack housing. When the battery pack experiences thermal runaway and abnormal pressure or gas accumulation occurs inside, the explosion-proof valve can open to release the pressure or gas, preventing serious damage or explosion of the battery pack.

[0003] The explosion-proof valves used in the battery packs occasionally open abnormally. In this case, if the vehicle is in a water-filled environment, external liquid may enter the battery pack through the opening of the explosion-proof valve, posing a safety risk to the battery pack. Utility Model Content

[0004] This application aims to provide an explosion-proof valve protective cover, a battery pack, and a vehicle to at least solve the problem of existing explosion-proof valves causing water ingress into the battery pack due to abnormal opening, which poses a safety risk to the battery pack.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this application discloses an explosion-proof valve protective cover, the explosion-proof valve protective cover including a protective cover body, the protective cover body including a buffer cavity, the buffer cavity having an opening, and the bottom of the buffer cavity along a first direction being provided with a receiving portion, the receiving portion being used to accommodate liquid entering the buffer cavity.

[0006] Optionally, the receiving portion is provided with a recessed portion that is at least partially recessed downward along the first direction, and the recessed portion is an arc-shaped recessed surface or a groove.

[0007] Optionally, the explosion-proof valve cover further includes a connecting portion arranged around the opening, the connecting portion being adapted to connect to the battery pack housing.

[0008] Optionally, the connecting portion is provided with a receiving groove, which surrounds at least a portion of the opening, and the receiving groove is used to receive adhesive or sealant.

[0009] Optionally, the connecting part is further provided with an ear plate, which is located on the side of the receiving groove away from the opening. The ear plate has a mounting hole for inserting a fastener to connect the explosion-proof valve protective cover to the battery pack housing.

[0010] Optionally, the protective cover body includes a top plate, a bottom plate, a first side plate, and two second side plates. The top plate and the bottom plate are arranged opposite each other along the first direction, and the two second side plates are arranged opposite each other along the second direction. The top plate, the bottom plate, the first side plate, and the two second side plates are connected to each other to form the buffer cavity. The opening is opposite to the first side plate along a third direction. The receiving part is disposed on the bottom plate. The top plate is provided with a first exhaust hole. The first direction, the second direction, and the third direction intersect each other.

[0011] Optionally, there are multiple first exhaust holes, which are spaced apart on the top plate; the first exhaust hole is a circular hole with a diameter D, satisfying: D≤20mm.

[0012] Optionally, at least one of the second side plates is also provided with a second vent hole.

[0013] Optionally, the second exhaust port is a strip-shaped hole, and the length direction of the strip-shaped hole is arranged along the third direction.

[0014] Secondly, this application also discloses a battery pack, including a battery management system, a detection module, and an explosion-proof valve protective cover as described in any of the preceding claims; The detection module is located in the buffer cavity of the explosion-proof valve protective cover and is at least partially connected to the receiving part. The detection module is used to detect the liquid accumulation in the receiving part and send a detection signal to the battery management system.

[0015] Optionally, the battery pack further includes a housing and an explosion-proof valve. The housing includes a frame that encloses a cavity. The explosion-proof valve passes through the frame. An explosion-proof valve protective cover is connected to the side of the frame near the cavity and covers the explosion-proof valve. The battery management system is at least partially located within the cavity. The detection module includes multiple acquisition lines, each of which includes a first end and a second end. The first end of each acquisition line is connected to the battery management system, and the second end extends to the receiving part. The second ends of the multiple acquisition lines are spaced apart from each other. When there is liquid accumulation in the receiving part, and the liquid accumulation is in contact with the second ends of at least two of the multiple acquisition lines, at least two acquisition lines are connected through the liquid accumulation.

[0016] Thirdly, this application also discloses a vehicle including an explosion-proof valve cover or battery pack as described in any of the preceding claims.

[0017] In this embodiment, the explosion-proof valve protective cover can be used to cover the explosion-proof valve. Since the bottom of the buffer chamber of the explosion-proof valve protective cover is provided with a receiving part, and the receiving part can be used to accommodate liquid entering the buffer chamber, if the explosion-proof valve is abnormally opened and external liquid enters the battery pack from the explosion-proof valve opening, since the explosion-proof valve protective cover is provided over the explosion-proof valve, the liquid will not directly penetrate into the battery pack. Instead, under the action of gravity, it will first accumulate on the receiving part in the buffer chamber of the protective cover body, thereby reducing the risk of the battery pack being damaged due to the liquid directly entering the battery pack and ensuring the safety performance of the battery pack.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the explosion-proof valve protective cover in the embodiments of this application; Figure 2 This is a schematic diagram showing the connection between the data acquisition module, the explosion-proof valve protective cover, and the battery management system in an embodiment of this application. Figure 3 This is a schematic diagram of the connection between the explosion-proof valve protective cover and the housing in an embodiment of this application; Figure 4 This is a partial schematic diagram of the battery pack in an embodiment of this application.

[0020] Figure label: 100-Explosion-proof valve protective cover, 10-Protective cover body, 101-Buffer chamber, 1011-Opening, 102-Receiving part, 11-Top plate, 111-First exhaust hole, 12-Bottom plate, 13-First side plate, 14-Second side plate, 141-Second exhaust hole, 20-Connecting part, 21-Accommodation slot, 200-Battery management system, 300-Detection module, 301-Acquisition line, 400-Box body, 401-Frame, 402-Accommodation chamber, 500-Explosion-proof valve, X-First direction, Y-Second direction, Z-Third direction. Detailed Implementation

[0021] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used 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 inventive effort are within the scope of protection of this application.

[0022] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] As a key component to ensure the safety performance of battery packs, explosion-proof valves are usually installed on the battery pack housing. When the battery pack experiences thermal runaway and abnormal pressure or gas accumulation occurs inside, the explosion-proof valve can open to release the pressure or gas, preventing serious damage or explosion of the battery pack.

[0026] Under normal operating conditions, the explosion-proof valve has a one-way sealing characteristic, which can prevent external moisture and dust from entering the battery pack, while allowing internal gas to escape in one direction. However, the explosion-proof valve in the battery pack occasionally opens abnormally. In this case, if the vehicle is in a water-filled environment, external liquid may enter the battery pack through the opening of the explosion-proof valve, posing a safety risk to the battery pack.

[0027] For the reasons mentioned above, this application discloses an explosion-proof valve protective cover 100. The explosion-proof valve protective cover 100 includes a protective cover body 10, the protective cover body 10 includes a buffer cavity 101, the buffer cavity 101 has an opening 1011, and a receiving part 102 is provided at the bottom of the buffer cavity 101 along the first direction X. The receiving part 102 is used to contain liquid entering the buffer cavity 101, wherein the first direction X is the direction of gravity.

[0028] In this embodiment, the explosion-proof valve protective cover 100 can be used to cover the explosion-proof valve 500. Since the bottom of the buffer cavity 101 of the explosion-proof valve protective cover 100 is provided with a receiving part 102, and the receiving part 102 can be used to accommodate the liquid entering the buffer cavity 101, if the explosion-proof valve 500 is abnormally opened and external liquid enters the battery pack from the opening 1011 of the explosion-proof valve 500, since the explosion-proof valve protective cover 100 covers the explosion-proof valve 500, the liquid will not directly penetrate into the battery pack. Instead, under the action of gravity, it will first accumulate on the receiving part 102 in the buffer cavity 101 of the protective cover body 10, thereby reducing the risk of the battery pack being damaged due to the liquid directly entering the battery pack and ensuring the safety performance of the battery pack.

[0029] In specific applications, the explosion-proof valve 500 is connected to the frame 401 of the battery pack housing 400. The explosion-proof valve 500 is provided with a pressure relief channel, which connects the internal environment of the battery pack with the external environment. Under normal operating conditions, the pressure relief channel can usually be blocked by a pressure relief diaphragm. In the event of thermal runaway of the battery pack, the high-temperature and high-pressure gas inside the battery pack will break through the pressure relief diaphragm and be discharged from the battery pack through the pressure relief channel. In this embodiment, the explosion-proof valve protective cover 100 is disposed inside the battery pack and connected to the inner wall of the frame 401 of the battery pack housing 400. When the explosion-proof valve protective cover 100 is connected to the inner wall of the frame 401 of the battery pack housing 400, the explosion-proof valve protective cover 100 covers the explosion-proof valve 500, and the opening 1011 of the pressure relief channel is located in the buffer cavity 101 of the protective cover body 10. The opening 1011 of the buffer cavity 101 surrounds the explosion-proof valve 500. In this structure, if the explosion-proof valve 500 opens abnormally and the vehicle is in a water-filled environment, water or other liquids outside the battery pack can easily enter the battery pack through the opening 1011 of the explosion-proof valve 500. At this time, the external liquid will first enter the buffer cavity 101 of the protective cover body 10 covering the explosion-proof valve 500. After entering the buffer cavity 101, under the action of gravity, the liquid will fall onto the receiving part 102 at the bottom of the buffer cavity 101. The receiving part 102 is an integral structure that can be used to contain the falling liquid. It should be noted that after the explosion-proof valve protective cover 100 is installed over the explosion-proof valve 500, the misalignment between the axial center of the explosion-proof valve 500 and the planar geometric center of the protective cover should be ≤50mm. This ensures that the gas flow path within the buffer chamber 101 is relatively uniform, ensuring that the gas, after entering the buffer chamber 101 from all directions, flows relatively evenly towards the explosion-proof valve 500. This guarantees the stability of the exhaust efficiency and exhaust effect, and reduces the probability that excessive misalignment will cause local turbulence or dead zones in the buffer chamber 101, affecting the smooth arrival and discharge of the gas to the explosion-proof valve 500.

[0030] Furthermore, the receiving part 102 may be provided with a recessed part that is at least partially downward along the first direction X. The recessed part may be an arc-shaped recessed surface or a groove. By designing the recessed part, the capacity of the receiving part 102 can be increased so as to receive more liquid when the battery pack is filled with liquid, thereby further reducing the probability of liquid entering the battery pack and causing damage to the battery pack.

[0031] Optionally, the explosion-proof valve cover 100 also includes a connecting portion 20, which is disposed around at least a portion of the opening 1011 and is adapted to be connected to the battery pack housing 400.

[0032] In this embodiment, by providing a connecting part 20, which surrounds the opening 1011 of the protective cover body 10, the connection area between the explosion-proof valve protective cover 100 and the battery pack housing 400 is increased, thereby improving the connection strength between the explosion-proof valve protective cover 100 and the battery pack housing 400. Under conditions of vehicle wading or vibration, the explosion-proof valve protective cover 100 is guaranteed not to fall off, and provides more reliable protection for the inside of the battery pack.

[0033] Specifically, the protective cover body 10 is a shell structure with a buffer cavity 101. The buffer cavity 101 has an opening 1011 to allow the explosion-proof valve 500 to extend into the buffer cavity 101. At the same time, the opening 1011 is used to connect with the inner wall of the frame 401 of the battery pack housing 400. The connecting part 20 is arranged around the circumference of the opening 1011, or the connecting part 20 is a segmented structure arranged around the circumference of the opening 1011. In addition, the connecting part 20 can not only be used to connect the battery pack housing 400, but also to achieve a seal between the protective cover body 10 and the housing 400, to prevent water leakage caused by the gap between the opening 1011 and the housing 400, and to ensure that the liquid entering the buffer cavity 101 can fall onto the receiving part 102 as much as possible.

[0034] In specific applications, the connecting part 20 can be bonded to the inner wall of the frame 401 of the battery pack housing 400, or connected by fasteners. When the connecting part 20 is bonded to the frame 401, the two are connected by adhesive, which not only achieves the connection but also seals the gap between them. When the connecting part 20 is fastened to the frame 401, the fastener only achieves the connection; in this case, sealant can be added to the connecting part 20 to achieve a seal between them.

[0035] In some optional embodiments of this application, the explosion-proof valve protective cover 100 includes a connecting portion 20 to facilitate the connection between the explosion-proof valve protective cover 100 and the battery pack housing 400. At the same time, the receiving portion 102 of the protective cover body 10 is also provided with a recessed portion to enhance the liquid-holding capacity of the receiving portion 102.

[0036] like Figure 1As shown, the connecting part 20 is provided with a receiving groove 21, which surrounds the opening 1011. The receiving groove 21 is used to hold adhesive or sealant. By providing the receiving groove 21 in the connecting part 20, when the adhesive or sealant is contained in the receiving groove 21, the receiving groove 21 can restrict the flow of the adhesive, so that the adhesive can be more concentratedly distributed in the preset connection area. This avoids the problem of uneven distribution of adhesive caused by random flow of adhesive, which reduces the connection strength between the connecting part 20 and the frame 401 of the housing 400. This significantly improves the stability of the connection between the explosion-proof valve protective cover 100 and the battery pack housing 400, and reduces the risk of the explosion-proof valve protective cover 100 loosening or falling off due to vibration, collision or other factors during battery pack transportation or vehicle operation. In addition, since the colloid has a certain fluidity before curing, by setting a receiving groove 21 on the connecting part 20, the operator can directly inject the colloid into the receiving groove 21 without worrying about uneven application or excessive overflow affecting the appearance and connection effect, thus simplifying the installation process and ensuring installation efficiency.

[0037] The receiving groove 21 in this embodiment can have any shape, such as rectangular, semi-circular, or trapezoidal, and this application does not impose any specific limitation on it. In addition, the width and depth of the receiving groove 21 can be designed in combination with the size of the connecting part 20 and parameters such as the flowability of the colloid, and this application does not impose any limitation on the specific size of the receiving groove 21.

[0038] Optionally, the connecting portion 20 is also provided with a lug plate, which is located on the side of the receiving groove 21 away from the opening 1011. The lug plate has mounting holes for fasteners to pass through, so as to connect the explosion-proof valve protection cover 100 to the battery pack housing 400. It should be understood that by adding a lug plate to the connecting portion 20, and the lug plate having mounting holes, the explosion-proof valve protection cover 100 can achieve a stable mechanical connection with the battery pack housing 400 through fasteners (such as bolts, screws, pins, etc.), thereby improving the connection strength and reliability between the explosion-proof valve protection cover 100 and the battery pack housing 400, and more effectively resisting external vibration and impact.

[0039] In specific applications, there can be multiple ear plates, which are spaced apart circumferentially along the connecting part 20. The frame 401 of the battery pack housing 400 is provided with fixing holes. Fasteners can pass through the mounting holes on the ear plates and the fixing holes on the frame 401 to fix the two together. When the explosion-proof valve cover 100 and the battery pack housing 400 are mechanically connected by fasteners, filling the receiving groove 21 with adhesive can further improve the connection strength between the two. When the receiving groove 21 is filled with sealant, since the adhesive strength of the sealant is relatively weak, it is easy to disassemble the explosion-proof valve cover 100, reducing the maintenance time and cost in the later stage.

[0040] like Figure 1 As shown, the protective cover body 10 includes a top plate 11, a bottom plate 12, a first side plate 13, and two second side plates 14. The top plate 11 and the bottom plate 12 are arranged opposite each other along the first direction X, and the two second side plates 14 are arranged opposite each other along the second direction Y. The top plate 11, the bottom plate 12, the first side plate 13, and the two second side plates 14 are connected to each other to form a buffer cavity 101. The opening 1011 is opposite to the first side plate 13 along the third direction Z. The receiving part 102 is provided on the bottom plate 12. The top plate 11 is provided with a first exhaust hole 111.

[0041] In this embodiment, by providing a first vent 111 on the top plate 11, in the event of thermal runaway of the battery pack, the first vent 111 can be used to release the high-temperature, high-pressure gas generated by thermal runaway, avoiding the problem of poor venting during thermal runaway caused by the explosion-proof valve protective cover 100 covering the explosion-proof valve 500. Furthermore, normally, when the battery pack experiences thermal runaway, the gas will be discharged from the top of the battery pack towards the explosion-proof valve 500. By providing the first vent 111 on the top plate 11 of the protective cover body 10, the gas discharge path is aligned, which helps to improve venting efficiency.

[0042] It should be noted that in this embodiment, the protective cover body 10 is divided into a top plate 11, a bottom plate 12, a first side plate 13, and two second side plates 14, which can more clearly indicate the position of the first exhaust port 111, but does not constitute a limitation on the structural form of the protective cover body 10. The protective cover body 10 can be as follows: Figure 1 The structure shown here is such that the top plate 11, bottom plate 12, first side plate 13 and second side plate 14 are all flat plate structures. In some alternative embodiments, the top plate 11, bottom plate 12, first side plate 13 or second side plate 14 may also be curved surface structures. The protective cover body 10 may be formed by multiple flat plate structures, or by multiple curved surface structures, or by a combination of flat plate structures and curved surface structures, so that the protective cover body 10 forms a hemispherical, cylindrical or other structure.

[0043] Optionally, there are multiple first vent holes 111, which are spaced apart on the top plate 11; the first vent hole 111 is a round hole with a diameter of D, satisfying: D≤20mm.

[0044] By providing multiple first vent holes 111 on the top plate 11, the total area of ​​the gas discharge channel is greatly increased. When gas is generated inside the battery pack, the gas is discharged through the explosion-proof valve cover 100 at a higher speed and efficiency. In the event of thermal runaway inside the battery pack, the internal pressure can be released quickly, preventing damage to the explosion-proof valve cover 100 or the explosion-proof valve 500 due to excessive pressure. Furthermore, if the diameter of the first vent hole 111 is too large, debris generated during thermal runaway or other foreign objects inside the battery pack can easily enter the buffer chamber 101 through the first vent hole 111. Since the buffer chamber 101 is connected to the pressure relief channel of the explosion-proof valve 500, these foreign objects can easily block the pressure relief channel, causing poor venting. In this embodiment, by rationally designing the diameter of the first vent hole 111, structural debris generated during thermal runaway of the battery pack can be effectively prevented from entering the buffer chamber 101 of the explosion-proof valve cover 100 through the first vent hole 111, thereby greatly reducing the probability of these debris blocking the explosion-proof valve 500.

[0045] It should be noted that the shape of the first exhaust hole 111 is not limited to the circular hole exemplified in the embodiments of this application, but can also be a square hole, a triangular hole, etc., and this application does not make specific limitations in this regard.

[0046] Optionally, at least one second side plate 14 is also provided with a second vent 141.

[0047] In this embodiment, with a first vent 111 provided on the top plate 11, a second vent 141 is also provided on at least one second side plate 14, increasing the area of ​​the venting channel. Furthermore, since the second side plate 14 and the top plate 11 are not in the same direction, gas inside the battery pack can be discharged through either the first vent 111 on the top plate 11 or the second vent 141 on the second side plate 14. This multi-directional venting method can adapt to various airflow directions that may exist inside the battery pack, improving the gas discharge speed. Additionally, when the first vent 111 is blocked by debris generated by thermal runaway of the battery pack, the second vent 141 can provide redundancy for venting, ensuring venting reliability. In specific applications, with a fixed area of ​​the top plate 11, the placement of the second vent 141 on the second side plate 14 also increases the flexibility in the design of the number and location of vents, thereby improving the adaptability of the explosion-proof valve cover 100 to battery packs with different structures. The shape of the second exhaust hole 141 can be circular, square, triangular, trapezoidal, etc., and this application does not limit it; the number of the second exhaust holes 141 can be multiple or one, and the design of the number can be combined with its area to ensure the structural strength of the second side plate 14 while ensuring the exhaust area.

[0048] Optionally, the second vent 141 is a strip-shaped hole, with its length direction set along the third direction Z. This strip-shaped hole structure has a larger dimension in the length direction, thereby providing a larger effective venting area and facilitating the discharge of gas inside the battery pack. Furthermore, with the second vent 141 being a strip-shaped hole, the number of vents can be reduced accordingly due to its larger venting area, thus simplifying the manufacturing process.

[0049] In specific applications, to prevent liquid accumulation in the receiving part 102 from overflowing the buffer cavity 101 through the second vent 141, a distance, such as 1mm, needs to be reserved between the lowest point of the second vent 141 along the first direction X and the base plate 12. This value is for illustrative purposes only and can be flexibly designed in actual applications. Figure 1 As shown in the embodiment of this application, there are two strip holes, and the length direction of both strip holes is set along the third direction Z. The two strip holes are spaced apart along the first direction X.

[0050] In summary, the explosion-proof valve protective cover 100 provided in this application embodiment may include at least the following advantages: In this embodiment, the explosion-proof valve protective cover 100 can be used to cover the explosion-proof valve 500. Since the bottom of the buffer cavity 101 of the explosion-proof valve protective cover 100 is provided with a receiving part 102, and the receiving part 102 can be used to accommodate the liquid entering the buffer cavity 101, if the explosion-proof valve 500 is abnormally opened and external liquid enters the battery pack from the opening 1011 of the explosion-proof valve 500, since the explosion-proof valve protective cover 100 covers the explosion-proof valve 500, the liquid will not directly penetrate into the battery pack. Instead, under the action of gravity, it will first accumulate on the receiving part 102 in the buffer cavity 101 of the protective cover body 10, thereby reducing the risk of the battery pack being damaged due to the liquid directly entering the battery pack and ensuring the safety performance of the battery pack.

[0051] This application also provides a battery pack, such as... Figure 2 As shown, the battery pack provided in this application embodiment includes a battery management system 200, a detection module 300, and an explosion-proof valve protective cover 100 as described above; the detection module 300 is disposed in the buffer cavity 101 of the explosion-proof valve protective cover 100 and is at least partially connected to the receiving part 102. The detection module 300 is used to detect the liquid accumulation in the receiving part 102 and send a detection signal to the battery management system 200.

[0052] It should be noted that in this embodiment, the structure of the explosion-proof valve protective cover 100 is the same as that of the explosion-proof valve protective cover 100 in any of the above embodiments, and its beneficial effects are also similar, so it will not be described in detail here.

[0053] Understandably, during the use of the battery pack, liquids (such as rainwater, condensate, etc.) may enter the buffer chamber 101 of the explosion-proof valve protective cover 100 and accumulate in the receiving part 102. By installing a detection module 300 in the battery pack, the detection module 300 can monitor the liquid accumulation in the receiving part 102 in real time. Once the liquid accumulation reaches or exceeds a preset safety threshold, a detection signal will be sent to the battery management system 200. This allows the battery management system 200 to detect potential safety hazards in advance. For example, excessive liquid accumulation may affect the normal function of the explosion-proof valve 500, or in extreme cases, cause liquid to backflow into the battery pack, leading to safety problems such as short circuits. Through early warning, the battery management system 200 can take timely measures, such as shutdown inspection and drainage, to ensure the normal operation of the battery pack in various environments.

[0054] Specifically, the battery pack also includes a housing 400 and an explosion-proof valve 500, such as Figure 3 As shown, the housing 400 includes a frame 401, which encloses a receiving cavity 402, as... Figure 4 As shown, the explosion-proof valve 500 passes through the frame 401. In this embodiment, the explosion-proof valve protective cover 100 is connected to the side of the frame 401 near the receiving cavity 402 and covers the explosion-proof valve 500. The battery management system 200 is at least partially located inside the receiving cavity 402. By connecting the explosion-proof valve protective cover 100 to the side of the frame 401 near the receiving cavity 402, a certain degree of isolation is achieved between the battery pack interior and the explosion-proof valve 500. While preventing external liquids from entering the battery pack interior, its structural design also prevents small internal fragments from spraying out and clogging the explosion-proof valve 500.

[0055] In this embodiment, the detection module 300 includes multiple acquisition lines 301. Each acquisition line 301 includes a first end and a second end. The first end of each acquisition line 301 is connected to the battery management system 200, and the second end extends to the receiving portion 102. The second ends of the multiple acquisition lines 301 are spaced apart in pairs. When there is liquid accumulation in the receiving portion 102, and the liquid is in contact with the second ends of at least two of the multiple acquisition lines 301, at least two acquisition lines 301 are connected through the liquid accumulation. Figure 2 As shown in the figure, a schematic diagram of a data acquisition line 301 connected to the explosion-proof valve protective cover 100 and the battery management system 200 is illustrated. The second end of the data acquisition line 301 passes through the second side plate 14 via the second vent 141 and extends into the buffer cavity 101. In practical applications, the connection method of the data acquisition line 301 is not limited to that shown in the figure and can be designed according to the specific structure.

[0056] In this embodiment, the liquid accumulation on the receiving part 102 is monitored by the acquisition line 301. The structure is simple and easy to install. Furthermore, the two acquisition lines 301 will only conduct when there is liquid accumulation on the receiving part 102 and the liquid is in contact with the second end of at least two acquisition lines 301 at the same time. This improves the detection accuracy of the actual presence of liquid accumulation and avoids misjudgment caused by a small amount of liquid splashing or temporary adhesion. In addition, the design of multiple acquisition lines 301 can also be used to monitor the liquid accumulation at multiple locations on the receiving part 102, thereby improving the monitoring accuracy.

[0057] This application also provides a vehicle including the explosion-proof valve cover 100 or battery pack as described in any of the above embodiments.

[0058] It should be noted that in the embodiments of this application, the structure of the explosion-proof valve protective cover 100 or the battery pack is the same as that of the explosion-proof valve protective cover 100 or the battery pack in any of the above embodiments, and their beneficial effects are also similar, so they will not be described in detail here.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A protective cover (100) for an explosion-proof valve, characterized in that, The explosion-proof valve protective cover (100) includes a protective cover body (10), the protective cover body (10) includes a buffer cavity (101), the buffer cavity (101) has an opening (1011), and the buffer cavity (101) is provided with a receiving part (102) at the bottom along the first direction (X), the receiving part (102) is used to contain the liquid entering the buffer cavity (101).

2. The explosion-proof valve protective cover (100) according to claim 1, characterized in that, The receiving part (102) is provided with a recessed part that is at least partially recessed downward along the first direction (X), and the recessed part is an arc-shaped recessed surface or a groove.

3. The explosion-proof valve protective cover (100) according to claim 1 or 2, characterized in that, The explosion-proof valve cover (100) also includes a connecting part (20) which is disposed around at least part of the opening (1011) and is adapted to be connected to the housing (400) of the battery pack.

4. The explosion-proof valve protective cover (100) according to claim 3, characterized in that, The connecting part (20) is provided with a receiving groove (21), which is arranged around the opening (1011) and is used to receive adhesive or sealant.

5. The explosion-proof valve protective cover (100) according to claim 4, characterized in that, The connecting part (20) is also provided with an ear plate, which is located on the side of the receiving groove (21) away from the opening (1011). The ear plate has a mounting hole for inserting a fastener to connect the explosion-proof valve cover (100) to the battery pack housing (400).

6. The explosion-proof valve protective cover (100) according to any one of claims 1 to 5, characterized in that, The protective cover body (10) includes a top plate (11), a bottom plate (12), a first side plate (13), and two second side plates (14). The top plate (11) and the bottom plate (12) are arranged opposite each other along the first direction (X), and the two second side plates (14) are arranged opposite each other along the second direction (Y). The top plate (11), the bottom plate (12), the first side plate (13), and the two second side plates (14) are connected to each other to form the buffer cavity (101). The opening (1011) is opposite to the first side plate (13) along the third direction (Z). The receiving part (102) is disposed on the bottom plate (12). The top plate (11) is provided with a first exhaust hole (111). The first direction (X), the second direction (Y), and the third direction (Z) intersect each other.

7. The explosion-proof valve protective cover (100) according to claim 6, characterized in that, There are multiple first exhaust holes (111), and multiple first exhaust holes (111) are spaced apart on the top plate (11); the first exhaust hole (111) is a round hole, and the diameter of the first exhaust hole (111) is D, which satisfies: D≤20mm.

8. The explosion-proof valve protective cover (100) according to claim 6, characterized in that, At least one of the second side plates (14) is also provided with a second vent (141).

9. The explosion-proof valve protective cover (100) according to claim 8, characterized in that, The second exhaust port (141) is a strip-shaped hole, and the length direction of the strip-shaped hole is set along the third direction (Z).

10. A battery pack, characterized in that, It includes a battery management system (200), a detection module (300), and an explosion-proof valve cover (100) as described in any one of claims 1 to 9. The detection module (300) is located in the buffer cavity (101) of the explosion-proof valve protective cover (100) and is at least partially connected to the receiving part (102). The detection module (300) is used to detect the liquid accumulation in the receiving part (102) and send a detection signal to the battery management system (200).

11. The battery pack according to claim 10, characterized in that, The battery pack also includes a housing (400) and an explosion-proof valve (500). The housing (400) includes a frame (401) that encloses a cavity (402). The explosion-proof valve (500) passes through the frame (401). An explosion-proof valve cover (100) is connected to the side of the frame (401) near the cavity (402) and covers the explosion-proof valve (500). The battery management system (200) is at least partially located within the cavity (402). The detection module (300) includes multiple acquisition lines (301), each acquisition line (301) includes a first end and a second end. The first end of each acquisition line (301) is connected to the battery management system (200), and the second end extends to the receiving part (102). The second ends of the multiple acquisition lines (301) are arranged at intervals. When there is liquid accumulation in the receiving part (102), and the liquid accumulation is in contact with the second ends of at least two of the multiple acquisition lines (301), at least two acquisition lines (301) are connected through the liquid accumulation.

12. A vehicle, characterized in that, Includes the explosion-proof valve cover (100) as described in any one of claims 1 to 9, or the battery pack as described in any one of claims 10 to 11.

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