Explosion-proof valve and battery pack with same

Abstract

The utility model discloses an explosion-proof valve, a battery pack with the explosion-proof valve and a box body used for the battery pack, the explosion-proof valve comprises a valve body, the valve body is provided with a pressure relief hole, and the pressure relief hole penetrates through the valve body along a first direction; the pressure relief assembly is arranged on the valve body, the pressure relief assembly is used for closing and opening the pressure relief hole, an airflow channel extending in the first direction is formed in the pressure relief assembly, and the airflow channel is suitable for communicating the inner space and the outer space of the box body; the moisture blocking assembly is configured to conduct or block the airflow channel; the fire arresting part is arranged on one side, in the first direction, of the valve body, the fire arresting part is suitable for being arranged in the box body, the fire arresting part is provided with an avoiding hole penetrating through the fire arresting part in the first direction, and the pressure relief assembly partially penetrates through the avoiding hole. According to the explosion-proof valve disclosed by the utility model, the safety performance of the battery pack can be well improved, and the pressure relief assembly and the fire-retardant part are more compactly arranged on the valve body, so that the explosion-proof valve can be more conveniently arranged on the box body.

Description

Technical Field

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

[0002] In the tide of social development, stability is the ultimate goal pursued time and again by many industries in their continuous progress, and it is also the starting point for solving one new problem after another and taking one new step after another. With the rise of new energy vehicles, the safety design of battery packs has become a research hotspot due to the acceleration of industrialization. Battery packs typically have explosion-proof valves installed on the casing. In the event of thermal runaway, high-temperature, high-pressure gases can be discharged from the battery pack through the explosion-proof valves, or external air can flow into the battery pack through the explosion-proof valves when the pressure difference between the inside and outside of the battery pack is too large. This ensures the stability of battery pack operation and improves operational safety.

[0003] In related technologies, when a fire occurs inside the battery pack, the explosion-proof valve fails to prevent the fire. Furthermore, moisture in the air can easily enter the battery pack through the explosion-proof valve, leading to condensation inside the battery pack. This reduces the electrical safety performance of the battery pack and compromises its operational stability and reliability. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an explosion-proof valve that can effectively reduce condensation inside the battery pack and also act as a flame arrestor, thereby significantly improving the safety performance of the battery pack.

[0005] This utility model also proposes a battery pack having the above-mentioned explosion-proof valve.

[0006] According to a first aspect of the present invention, an explosion-proof valve is used for a battery pack housing. The explosion-proof valve includes: a valve body having a pressure relief hole extending through the valve body in a first direction; a pressure relief assembly disposed on the valve body, the pressure relief assembly being used to close and open the pressure relief hole, the pressure relief assembly forming an airflow channel extending in the first direction, the airflow channel being adapted to connect the internal space of the housing with the external space; a moisture-blocking assembly configured to open or block the airflow channel; and a flame arrester disposed on one side of the valve body in the first direction, the flame arrester being adapted to be arranged inside the housing, the flame arrester having a clearance hole extending through the flame arrester in the first direction, the pressure relief assembly partially passing through the clearance hole.

[0007] According to this utility model, the explosion-proof valve is equipped with a moisture-blocking component and a flame arrester. The moisture-blocking component is installed in the airflow channel of the pressure relief component to guide or block the exhaust pipe, and the flame arrester is installed on one side of the valve body in the first direction. The structure is simple and the arrangement is reasonable. The explosion-proof valve can effectively reduce condensation inside the battery pack through the moisture-blocking component, and effectively prevent flames from shooting out of the battery pack through the flame arrester, thereby greatly improving the safety performance of the battery pack. The flame arrester is provided with a clearance hole, which makes it easier and more compact to arrange the pressure relief component and the flame arrester on the valve body, so that the explosion-proof valve can be more conveniently arranged on the enclosure.

[0008] In some embodiments of this utility model, the moisture-blocking component is disposed at one end of the airflow channel away from the valve body. The moisture-blocking component includes: a blocking component; a fixing component and a first elastic component. The fixing component is fixedly connected to the side wall of the airflow channel. The first elastic component is deformable along the first direction and its two ends abut against the blocking component and the fixing component respectively. The first elastic component always drives the blocking component to block the airflow channel.

[0009] In some embodiments of this utility model, the pressure relief assembly includes: a top cover that seals the pressure relief hole; a connector that extends along the first direction and passes through the clearance hole, one end of the connector being connected to the top cover, the top cover and the connector forming the airflow channel, the airflow channel passing through the top cover and the connector along the first direction; and a second elastic member that is sleeved on the connector. In the first direction, the second elastic member is located on the side of the valve body away from the top cover, and both ends are connected to the valve body and the connector, respectively. The second elastic member always pushes the connector away from the valve body to move, so that the top cover closes the pressure relief hole.

[0010] In one embodiment of the present invention, the explosion-proof valve further includes a sleeve, which is a heat-resistant component. The sleeve is disposed outside the connector and the second elastic component, with one end of the sleeve closed and the other end connected to the valve body.

[0011] In one embodiment of this utility model, on a projection plane perpendicular to the first direction, the ratio of the projected area of ​​the top cover to the projected area of ​​the valve body is greater than or equal to three-quarters, and the ratio of the projected area of ​​the pressure relief hole to the projected area of ​​the top cover is greater than or equal to two-thirds.

[0012] In some embodiments of this utility model, the flame arrester and the valve body are arranged at a distance in the first direction. The flame arrester includes a first fire filter and a second fire filter. Both the first fire filter and the second fire filter are connected to the valve body. The first fire filter and the second fire filter are arranged at a distance in the first direction. Both the first fire filter and the second fire filter are provided with the clearance hole.

[0013] In one embodiment of this utility model, the first fire filter is disposed on the side of the second fire filter facing the valve body. In the first direction, the distance between the first fire filter and the surface of the valve body facing away from the flame arrester is greater than or equal to 10 mm and less than or equal to 13 mm, and the spacing between the first fire filter and the second fire filter is greater than or equal to 3 mm and less than or equal to 5 mm.

[0014] In one embodiment of this utility model, both the first fire filter and the second fire filter are provided with a plurality of mesh holes. On a projection plane perpendicular to the first direction, the total projected area of ​​the overlapping area of ​​the plurality of mesh holes in the first fire filter and the second fire filter is greater than or equal to the projected area of ​​the pressure relief hole.

[0015] In some examples of this invention, the area of ​​a single mesh opening is greater than or equal to 2 mm. 2 and less than or equal to 4mm 2 And / or, the distance between adjacent mesh openings is greater than or equal to 1.5 mm and less than or equal to 3 mm.

[0016] A battery pack according to a second aspect of the present invention includes: a housing and an explosion-proof valve according to a first aspect of the present invention, wherein the explosion-proof valve is disposed in the housing.

[0017] According to the battery pack of this utility model, by setting the explosion-proof valve of the first aspect mentioned above, and by setting a moisture-blocking component and a flame arrester, the moisture-blocking component is set in the airflow channel of the pressure relief component to guide or block the exhaust pipe, and the flame arrester is set on one side of the valve body in the first direction. The structure is simple and the arrangement is reasonable, so that the explosion-proof valve can effectively reduce the condensation in the battery pack through the moisture-blocking component, and effectively prevent flames from shooting out of the battery pack through the flame arrester, thereby greatly improving the safety performance of the battery pack. The flame arrester is provided with a clearance hole, so that the pressure relief component and the flame arrester can be arranged more conveniently and compactly on the valve body, so that the explosion-proof valve can be more conveniently arranged on the housing.

[0018] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0019] Figure 1This is a schematic diagram of an explosion-proof valve according to an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the explosion-proof valve according to an embodiment of the present utility model from another angle;

[0021] Figure 3 This is an exploded view of the explosion-proof valve according to an embodiment of the present utility model;

[0022] Figure 4 This is an exploded view of the explosion-proof valve according to an embodiment of the present utility model from another angle;

[0023] Figure 5 This is an exploded view of the explosion-proof valve according to another angle of this utility model embodiment;

[0024] Figure 6 This is a schematic diagram of the explosion-proof valve according to another angle of an embodiment of the present utility model;

[0025] Figure 7 yes Figure 6 The cross-sectional view at point AA shown;

[0026] Figure 8 yes Figure 6 The cross-sectional view at BB shown.

[0027] Figure label:

[0028] 10. Valve body; 11. Pressure relief hole; 12. Limiting groove;

[0029] 20. Pressure relief assembly; 201. Airflow channel;

[0030] 21. Top cover; 22. Connector; 23. Second elastic element;

[0031] 30. Moisture barrier component; 31. Sealing component; 32. First elastic component; 33. Fixing component; 34. Support pad;

[0032] 40. Flame arrestor; 401. Mesh; 402. Clearance hole; 41. First flame filter; 42. Second flame filter;

[0033] 50. Sleeve; 60. Breathable membrane; 70. Protective cover;

[0034] 100. Explosion-proof valve. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0036] First, refer to Figures 1-8 A brief description of the battery pack according to the second aspect of the present invention is provided. The battery pack includes an explosion-proof valve 100 and a housing. The explosion-proof valve 100 is disposed on the housing. When the battery pack is in operation, external air can circulate with the air inside the housing through the explosion-proof valve 100. In the event of thermal runaway of the battery pack, the high-temperature gas inside the housing can be discharged from the battery pack through the explosion-proof valve 100.

[0037] The following is for reference. Figures 1-8 The explosion-proof valve 100 according to a first aspect embodiment of the present invention is described.

[0038] like Figures 1-8 As shown, the explosion-proof valve 100 according to the first aspect of the present invention is used for the housing of a battery pack. The explosion-proof valve 100 includes: a valve body 10, a pressure relief assembly 20, a moisture barrier assembly 30, and a flame arrestor 40.

[0039] Specifically, the valve body 10 is provided with a pressure relief hole 11, and the pressure relief hole 11 is along a first direction (e.g., Figure 1 The valve body 10 is penetrated in the vertical direction shown. The pressure relief assembly 20 is disposed on the valve body 10. The pressure relief assembly 20 is used to close and open the pressure relief hole 11. The pressure relief assembly 20 forms an airflow channel 201 extending in the first direction. The airflow channel 201 is suitable for connecting the internal space of the box with the external space. The moisture barrier assembly 30 is configured to open or block the airflow channel 201. The flame arrester 40 is disposed on one side of the valve body 10 in the first direction. The flame arrester 40 is suitable for being arranged in the box. The flame arrester 40 has a clearance hole 402 that penetrates the flame arrester 40 in the first direction. The pressure relief assembly 20 is partially inserted through the clearance hole 402.

[0040] In this embodiment, the explosion-proof valve 100 is provided with a valve body 10, and the valve body 10 is provided with a pressure relief hole 11 that extends through the valve body 10 in a first direction. For example, the valve body 10 can be installed on a housing, and the pressure relief hole 11 can communicate with the internal space and external space of the housing. The pressure relief assembly 20 is provided on the valve body 10 and is used to close and open the pressure relief hole 11, which can well meet the usage requirements of the explosion-proof valve 100. When the battery pack experiences thermal runaway, the pressure relief assembly 20 can open the pressure relief hole 11, allowing high-temperature gas to be discharged from the housing to the external space through the pressure relief hole 11. When the battery pack is operating normally, the pressure relief assembly 20 can close the pressure relief hole 11, so that the housing of the battery pack can be in a good sealed state, and the battery pack can operate stably.

[0041] In this embodiment, the pressure relief component 20 forms an airflow channel 201 extending along the first direction. The airflow channel 201 connects the internal space and the external space of the housing, allowing air to flow into or out of the housing through the airflow channel 201. This allows the pressure difference between the internal space and the external space of the battery pack to be well balanced, thereby enabling the battery pack to operate more stably.

[0042] It is understandable that water vapor exists in the air, and water vapor can flow into or out of the battery pack with the airflow. When the temperature of the external environment changes rapidly, water vapor will condense into dew inside the battery pack, which will reduce the insulation performance of the battery pack. Especially when the external environment is hot and humid, the water content in the air is high, which makes the condensation inside the battery pack have a greater impact on the electrical safety of the battery pack, thus reducing the safety performance of the battery pack.

[0043] In this embodiment, a moisture-blocking component 30 is provided in the airflow channel 201 of the pressure relief component 20. The moisture-blocking component 30 is configured to open or block the airflow channel 201. This allows the explosion-proof valve 100 to open or block the airflow channel 201 according to the need for air pressure balance of the battery pack. When the moisture-blocking component 30 blocks the airflow channel 201, it can effectively prevent external air from entering the box, thereby reducing the amount of water vapor entering the box and greatly reducing the probability of condensation inside the battery pack. This allows the battery pack to have more stable and reliable electrical safety performance, and improves the operational stability and reliability of the battery pack, resulting in higher safety performance.

[0044] For example, during normal battery pack operation, when the pressure difference between the inside and outside of the enclosure is within the range that allows the battery pack to operate stably in a humid and hot environment, the moisture-blocking component 30 can remain in a state of constantly blocking the airflow channel 201, thereby preventing external air from flowing into the enclosure. Especially when the external environment is humid and hot, the moisture-blocking component 30 can effectively prevent a large amount of water vapor from flowing into the enclosure, thus greatly improving the electrical safety performance of the battery pack. When the pressure difference between the inside and outside of the enclosure is large, the moisture-blocking component 30 can open the airflow channel 201, allowing air inside and outside the enclosure to flow through the airflow channel 201 to balance the air pressure, enabling the battery pack to operate stably.

[0045] In this embodiment, a flame arrestor 40 is also provided. The flame arrestor 40 is disposed on one side of the valve body 10 in the first direction and arranged inside the box. For example, the flame arrestor 40 can be arranged directly opposite the pressure relief hole 11 in the first direction. When the battery pack experiences thermal runaway, when the flame inside the battery pack flows towards the explosion-proof valve 100, the flame arrestor 40 can effectively block the flame, thereby preventing the flame from flowing out of the box from the pressure relief hole 11 and exiting the battery pack, reducing the spread of the flame, and thus greatly improving the safety performance of the battery pack.

[0046] In this embodiment, the pressure relief component 20 is provided with a clearance hole 402. The pressure relief component 20 is partially inserted through the clearance hole 402. The structure is simple and can facilitate the assembly and arrangement of the pressure relief component 20 and the flame arrester 40 on the valve body 10. This allows the pressure relief component 20 and the flame arrester 40 to be arranged more compactly, thereby making the overall structure of the explosion-proof valve 100 more compact and having a smaller volume size, which facilitates the installation and arrangement of the explosion-proof valve 100 on the housing.

[0047] According to the embodiment of the present invention, the explosion-proof valve 100 is equipped with a moisture-blocking component 30 and a flame arrester 40. The moisture-blocking component 30 is disposed in the airflow channel 201 of the pressure relief component 20 to guide or block the exhaust pipe, and the flame arrester 40 is disposed on one side of the valve body 10 in the first direction. The structure is simple and the arrangement is reasonable. The explosion-proof valve 100 can effectively reduce the occurrence of condensation in the battery pack through the moisture-blocking component 30, and effectively prevent flames from being ejected from the battery pack through the flame arrester 40, thereby greatly improving the safety performance of the battery pack. The flame arrester 40 is provided with an avoidance hole 402, which makes it easier and more compact to arrange the pressure relief component 20 and the flame arrester 40 on the valve body 10, so that the explosion-proof valve 100 can be more conveniently arranged on the enclosure.

[0048] In some embodiments of this utility model, such as Figure 5 and Figure 7 As shown, the moisture barrier component 30 is located at one end of the airflow channel 201 away from the valve body 10. The moisture barrier component 30 may include: a blocking component 31, a fixing component 33 and a first elastic component 32. The fixing component 33 is fixedly connected to the side wall of the airflow channel 201. The first elastic component 32 is deformable along a first direction and its two ends abut against the blocking component 31 and the fixing component 33 respectively. The first elastic component 32 always drives the blocking component 31 to block the airflow channel 201.

[0049] In this embodiment, the moisture-blocking component 30 includes a sealing component 31, a fixing component 33, and a first elastic component 32. The structure is simple. The fixing component 33 is fixedly connected to the side wall of the airflow channel 201. For example, the fixing component 33 can be fixedly connected to the side wall of the airflow channel 201 by means of snap-fit ​​or adhesive fixation. The first elastic component 32 is disposed between the sealing component 31 and the fixing component 33, and its two ends abut against the sealing component 31 and the fixing component 33 respectively. The fixing component 33 can cooperate with the side wall of the airflow channel 201 to provide stable support and fixation for the elastic component, so that the first elastic component 32 can stably apply elastic force to the sealing component 31.

[0050] In this embodiment, the moisture-blocking component 30 is disposed at the end of the airflow channel 201 away from the valve body 10, which facilitates the assembly and arrangement of the moisture-blocking component 30 in the airflow channel 201. The first elastic element 32 always drives the sealing element 31 to block the airflow channel 201. For example, the first elastic element 32 can always be in a compressed state, so that the first elastic element 32 can always push the sealing element 31 to block the airflow channel 201, or the first elastic element 32 can always be in a stretched state, so that the first elastic element 32 can always pull the sealing element 31 to block the airflow channel 201. Thus, when the pressure difference between the inside and outside of the battery pack is within the pressure difference range that allows the battery pack to operate stably in a humid and hot environment, the sealing element 31 can reliably block the airflow channel 201 through the first elastic element 32.

[0051] When the pressure difference between the inside and outside of the housing is too large, the external atmospheric pressure can exert a force on the blocking component, causing the blocking component to overcome the elastic force of the first elastic element 32 and move in the opposite direction along the airflow channel 201. This allows the blocking component to be removed from the blockage, thereby opening the airflow channel 201. External air can then flow into the housing along the airflow channel 201 to balance the air pressure. When the pressure difference between the inside and outside of the housing returns to the range of pressure difference required for stable operation of the battery pack, the blocking component 31 can re-block the airflow channel 201 under the action of the first elastic element 32.

[0052] In one embodiment of this utility model, reference is made to Figure 7 As shown, the sidewall of the airflow channel 201 can be formed with a sealing surface. The sealing surface extends in a ring shape along the circumference of the airflow channel 201 and is arranged towards the fixing member 33. The sealing member 31 is provided on the side of the fixing member 33 facing the sealing surface. The sealing member 31 can include a sealing section. The sealing member 31 is movable between a blocked position and a conducting position. In the blocked position, the sealing member 31 abuts against the sealing surface to block the airflow channel 201. In the conducting position, the sealing member 31 separates from the sealing surface.

[0053] In this embodiment, a sealing surface is formed on the side wall of the airflow channel 201. When the sealing section of the sealing member 31 is in the blocked position, it abuts against the sealing surface. The structure is simple and can make the sealing member 31 stably block the airflow channel 201 by abutting against the sealing surface. For example, the sealing surface is formed on the connector 22. The moisture barrier component 30 can be set in the airflow channel 201 at the end of the connector 22 away from the valve body 10. This can well meet the usage requirements of the moisture barrier component 30 and facilitate the assembly and arrangement of the moisture barrier component 30 and the connector 22.

[0054] In one embodiment of this utility model, reference is made to Figure 7As shown, the sealing member 31 may further include a guide section, which is located on the side of the sealing member facing the sealing surface and connected to the sealing member 31. The guide section extends away from the sealing member in a first direction and passes through the sealing surface. In the direction from the sealing member towards the sealing surface, the cross-sectional area of ​​the guide section gradually decreases.

[0055] In this embodiment, the sealing component 31 is also provided with a guide section connected to the sealing component 31. The cross-sectional area of ​​the guide section gradually decreases towards the sealing surface. The guide section is arranged through the sealing surface, which is simple in structure. The guide section can play a good guiding role for the air along the flow channel 201. When the sealing component 31 is in the open position, when the air flows through the air channel 201 and out of the air channel 201 from the sealing component 31, the air can flow stably to the periphery of the sealing section under the guiding effect of the guide section. This can reduce the obstruction of the sealing component 31 to the air flow, and allow the airflow to flow more smoothly through the sealing component 31. This allows the air to flow smoothly into the box to balance the air pressure inside and outside the box.

[0056] In one embodiment of this utility model, reference is made to Figure 7 As shown, the fixing member 33 may be provided with a receiving groove, the opening of the receiving groove facing the sealing member 31, the first elastic member 32 is provided in the receiving groove and connected to the bottom of the receiving groove, the bottom of the receiving groove is provided with an air inlet hole, the air inlet hole is suitable to communicate with the internal space of the box, the fixing member 33 is also provided with multiple flow holes, the multiple flow holes are arranged circumferentially at intervals in the receiving groove, and the flow holes are connected to the airflow channel 201 and the receiving groove.

[0057] In this embodiment, a receiving groove is provided on the fixing member 33, with the opening of the receiving groove facing the blocking member 31. The first elastic member 32 is disposed in the receiving groove and connected to the bottom of the receiving groove. The structure is simple and facilitates the arrangement of the first elastic member 32. The receiving groove is connected to the air inlet and multiple flow holes. The air inlet and flow holes are respectively connected to the internal space of the box and the airflow channel 201, so that air can enter the receiving groove through the multiple flow holes and enter the box through the air inlet to balance the air pressure, thereby well meeting the need for airflow into the box when the blocking member 31 is in the open position. For example, the multiple flow holes can be provided at the end of the fixing member 33 facing the blocking member. This allows the airflow to flow to the flow holes more quickly after passing through the blocking member 31 and then into the box when the blocking member 31 opens the airflow channel 201, reducing the influence of the fixing member 33 on the airflow and making the airflow smoother and more stable.

[0058] In one embodiment of this utility model, the sealing member 31 can be a rubber part. This allows the sealing member 31 to have a certain elastic deformation capability, so that when the first elastic member 32 drives the sealing member 31 to block the airflow channel 201, the sealing member 31 can fit and abut against the sealing surface more stably and reliably, thereby making the sealing effect of the sealing member 31 on the airflow channel 201 better and more reliable.

[0059] In one embodiment of this utility model, such as Figure 5 and Figure 7 As shown, the moisture barrier assembly 30 may also include a support pad 34, which is disposed between the sealing member 31 and the fixing member 33, and the first elastic member 32 may be connected to the support pad 34.

[0060] In this embodiment, a support pad 34 is provided between the sealing member 31 and the fixing member 33. The structure is simple, and the support pad 34 increases the contact area between the first elastic member 32 and the sealing member 31. This allows the first elastic member 32 to apply elastic force to the sealing member 31 more stably, enabling the sealing member 31 to more stably block the airflow channel 201. Consequently, the moisture-blocking assembly 30 operates more stably and reliably. When the moisture-blocking assembly 30 opens the airflow channel 201, after the sealing member 31 moves towards the fixing member 33, the support pad 34 can reduce the occurrence of scraping between the sealing member 31 and the fixing member 33 to a certain extent, thus ensuring more stable operation of the sealing member 31 and the fixing member 33 during long-term use.

[0061] In some embodiments of this utility model, such as Figure 3 and Figure 7 As shown, the pressure relief assembly 20 may include: a top cover 21, a connector 22, and a second elastic member 23. The top cover 21 covers the pressure relief hole 11. The connector 22 extends along a first direction and passes through the clearance hole 402. One end of the connector 22 is connected to the top cover 21. The top cover 21 and the connector 22 cooperate to form an airflow channel 201. The airflow channel 201 passes through the top cover 21 and the connector 22 along the first direction. The second elastic member 23 is sleeved on the connector 22. In the first direction, the second elastic member 23 is located on the side of the valve body 10 away from the top cover 21, and its two ends are connected to the valve body 10 and the connector 22, respectively. The second elastic member 23 always pushes the connector 22 away from the valve body 10 so that the top cover 21 closes the pressure relief hole 11.

[0062] In this embodiment, the top cover 21 seals the pressure relief hole 11, the connector 22 extends along the first direction and is connected to the top cover 21, and the two ends of the second elastic member 23 are respectively connected to the valve body 10 and the connector 22. The structure is simple and can well meet the pressure relief requirements of the explosion-proof valve 100. When the battery pack is operating normally, one end of the second elastic member 23 is fixed to the valve body 10, so that the other end of the second elastic member 23 can stably apply elastic force to the connector 22. Under the elastic force, the connector 22 applies force to the top cover 21 so that the top cover 21 stably presses and seals the pressure relief hole 11. For example, the side of the valve body 10 away from the first elastic member 32 can be provided with a limiting groove 12 that cooperates with the top cover 21. The bottom of the limiting groove 12 can be provided with a pressure relief hole 11. The pressure relief hole 11 extends through the first direction to the other side of the valve body 10. The periphery of the top cover 21 can abut against the bottom of the limiting groove 12 to seal the pressure relief hole 11.

[0063] When thermal runaway occurs in the battery pack, the high-temperature and high-pressure gas inside the box exerts a force on the top cover 21, causing the top cover 21 to overcome the elastic force of the second elastic element 23 and move away from the valve body 10, thereby opening the pressure relief hole 11 and expelling the high-temperature and high-pressure gas from the pressure relief hole 11 into the battery pack.

[0064] In one embodiment of this utility model, reference is made to Figure 7 As shown, the connector 22 and the top cover 21 can be threaded together. This facilitates the assembly and disassembly of the top cover 21 and the connector 22. For example, an internal thread can be formed on the side wall of the airflow channel 201 at the end where the connector 22 connects to the top cover 21. The top cover 21 can be provided with a connecting portion, which has an external thread. The top cover 21 and the connector 22 are threaded together through the external thread of the connecting portion and the internal thread on the connector 22, thereby thread-fixing the top cover 21 and the connector 22 and forming a continuous airflow channel 201.

[0065] In one embodiment of this utility model, reference is made to Figure 7 As shown, the top cover 21 may be provided with an assembly groove, which is connected to the outlet of the airflow channel 201. The explosion-proof valve 100 may also include a protective cover 70 and a breathable membrane 60. The breathable membrane 60 is provided on the side of the top cover 21 away from the valve body 10 and is located in the assembly groove. The top cover 21 is located on the top cover 21 and seals the opening of the assembly groove.

[0066] In this embodiment, a breathable membrane 60 is provided. The breathable membrane 60 is arranged in the assembly groove. The structure is simple and allows the breathable membrane 60 to stably block water, dust and other particles in the external environment at the outlet of the airflow channel 201 and only allow airflow to pass through. This effectively avoids water, dust and other particles from entering the airflow channel 201 and blocking the airflow channel 201, or entering the box and causing a significant impact on the safety performance of the battery pack. This allows the battery pack to operate more stably and reliably.

[0067] In this embodiment, the protective cover 70 is provided to seal the opening of the assembly groove, which can provide good protection for the breathable membrane 60, thereby enabling the explosion-proof valve 100 to operate more stably.

[0068] In one embodiment of this utility model, reference is made to Figure 7 As shown, a first sealing ring may also be provided on the valve body 10. The first sealing ring extends in an annular shape along the circumference of the pressure relief hole 11, and the top cover 21 abuts against the first sealing ring. This allows the top cover 21 to more stably and reliably seal the pressure relief hole 11, thereby making the explosion-proof valve 100 operate more stably and reliably.

[0069] In one embodiment of this utility model, such as Figure 1 and Figure 7 As shown, the explosion-proof valve 100 may also include a sleeve 50, which is a heat-resistant component. The sleeve 50 is located outside the connector 22 and the second elastic component 23. One end of the sleeve 50 is closed and the other end is connected to the valve body 10.

[0070] In this embodiment, the explosion-proof valve 100 is provided with a sleeve 50. The sleeve 50 is a heat-resistant component and is sleeved on the outside of the connector 22 and the second elastic component 23. One end of the sleeve 50 is closed and the other end is connected to the valve body 10. The structure is simple and can play a good protective role for the second elastic component 23. It can effectively prevent the molten material generated during thermal runaway from adhering to the surface of the second elastic component 23 and affecting the long-term use of the second elastic component 23, making the pressure relief function of the explosion-proof valve 100 more reliable.

[0071] In one embodiment of this utility model, reference is made to Figure 4 and Figure 7 As shown, on the projection plane perpendicular to the first direction, the ratio of the projected area of ​​the top cover 21 to the projected area of ​​the valve body 10 can be greater than or equal to three-quarters, and the ratio of the projected area of ​​the pressure relief hole 11 to the projected area of ​​the top cover 21 can be greater than or equal to two-thirds.

[0072] In this embodiment, the ratio of the projected area of ​​the top cover 21 to the projected area of ​​the valve body 10 is set to be greater than three-quarters, and the ratio of the projected area of ​​the pressure relief hole 11 to the projected area of ​​the top cover 21 is greater than or equal to two-thirds. This allows the explosion-proof valve 100 to have a larger pressure relief and exhaust area within the same size, and allows the top cover 21 to have a larger area to stably and reliably seal the pressure relief hole 11. This enables the explosion-proof valve 100 to operate stably and reliably relieve pressure and exhaust when the battery pack experiences thermal runaway, thus giving the explosion-proof valve 100 excellent safety performance. At the same time, while maintaining excellent safety performance, the overall size of the explosion-proof valve 100 can be set to be smaller, which facilitates the installation and arrangement of the explosion-proof valve 100 on the battery pack housing and reduces the probability of interference between the explosion-proof valve 100 and the vehicle when the battery pack is assembled in the vehicle, making the battery pack assembly in the vehicle more convenient. For example, the ratio of the projected area of ​​the top cover 21 to the projected area of ​​the valve body 10 can be three-quarters, four-fifths, etc., and the ratio of the projected area of ​​the pressure relief hole 11 to the projected area of ​​the top cover 21 can be two-thirds, three-quarters, etc.

[0073] In some embodiments of this utility model, the valve body 10 can be a metal part. This gives the valve body 10 good structural strength, reduces the impact of high temperature changes on the opening pressure of the explosion-proof valve 100 when it is depressurizing, and thus makes the explosion-proof valve 100 have a higher accuracy when it is opening to depressurize, so that the explosion-proof valve 100 can play a more stable and reliable role in explosion-proof pressure relief.

[0074] In some embodiments of this utility model, such as Figure 7 and Figure 8 As shown, the flame arrestor 40 and the valve body 10 are arranged at a distance in the first direction. The flame arrestor 40 may include: a first flame filter 41 and a second flame filter 42. Both the first flame filter 41 and the second flame filter 42 are connected to the valve body 10. The first flame filter 41 and the second flame filter 42 are arranged at a distance in the first direction. Both the first flame filter 41 and the second flame filter 42 are provided with clearance holes 402.

[0075] In this embodiment, the flame arrestor 40 and the valve body 10 are arranged at a distance in the first direction. The structure is simple and can make a certain distance between the flame arrestor 40 and the valve body 10. When the flame inside the box spreads to the flame arrestor 40, even if the flame passes through the flame arrestor 40, the flame still needs a long spread path to reach the valve body 10. This further reduces the possibility of the flame being ejected outside the battery pack, so that the explosion-proof valve 100 can have a better flame arresting effect, thereby improving the safety performance of the battery pack.

[0076] In this embodiment, the flame arrestor 40 is provided with a first fire filter 41 and a second fire filter 42 arranged at intervals in the first direction. The structure is simple. The first fire filter 41 and the second fire filter 42 work together to provide a double-layer fire filtration effect for the flame. The flame arrestor 40 can achieve a better fire filtration and flame arresting effect through the arrangement of the first fire filter 41 and the second fire filter 42 and the interval arrangement of the first fire filter 41, the second fire filter 42 and the valve body 10. This further reduces the probability of the flame passing through the flame arrestor 40 and better prevents the flame from being ejected outside the battery pack, thereby further improving the safety performance of the battery pack.

[0077] In this embodiment, both the first fire filter 41 and the second fire filter 42 are provided with clearance holes 402. The structure is simple and allows the sleeve 50 and the connecting parts 22 to pass through the clearance holes 402 and be installed with the top cover 21 and the valve body 10, which well meets the assembly requirements of the explosion-proof valve 100.

[0078] In one embodiment of this utility model, reference is made to Figure 7 and Figure 8 As shown, the first fire filter 41 is disposed on the side of the second fire filter 42 facing the valve body 10. In the first direction, the distance between the first fire filter 41 and the surface of the valve body 10 facing away from the flame arrestor 40 can be greater than or equal to 10 mm and less than or equal to 13 mm, and the spacing between the first fire filter 41 and the second fire filter 42 can be greater than or equal to 3 mm and less than or equal to 5 mm.

[0079] In this embodiment, the distance between the first fire filter 41 and the surface of the valve body 10 facing away from the flame arrestor 40 is set to be greater than or equal to 10 mm and less than or equal to 13 mm. This allows the first fire filter 41 and the valve body 10 to be spaced sufficiently far apart in the first direction, so that when the flame in the housing passes through the second fire filter 42 and the first fire filter 41, it still needs a relatively long path to spread to the outside of the valve body 10. This can further reduce the probability of flames being ejected from the battery pack, and make the distance between the first fire filter 41 and the valve body 10 more suitable, so that the first fire filter 41 can stably play the role of filtering and arresting flames on the side of the pressure relief hole 11 facing the flame arrestor 40.

[0080] In this embodiment, the distance between the first fire filter 41 and the second fire filter 42 is set to be greater than or equal to 3mm and less than or equal to 5mm. This allows the first fire filter 41 and the second fire filter 42 to have a suitable distance, so that after the second fire filter 42 can effectively filter and block the flame, the flame can quickly spread to the first fire filter 41 and be filtered and blocked again by the first fire filter 41. Thus, the first fire filter 41 and the second fire filter 42 can work together to achieve a better fire blocking and filtering effect.

[0081] For example Figure 8As shown in the figure, d1 represents the distance between the first fire filter 41 and the second fire filter 42, and d2 represents the distance between the first fire filter 41 and the side surface of the valve body 10 facing away from the flame arrestor 40. d2 can be 10mm, 10.5mm, 11mm, 12mm, 13mm, etc., and d1 can be 3mm, 3.5mm, 4mm, 5mm, etc.

[0082] In one embodiment of this utility model, reference is made to Figure 4 and Figure 7 As shown, both the first fire filter 41 and the second fire filter 42 can be provided with multiple mesh holes 401. On the projection plane perpendicular to the first direction, the total projected area of ​​the overlapping area of ​​the multiple mesh holes 401 in the first fire filter 41 and the second fire filter 42 is greater than or equal to the projected area of ​​the pressure relief hole 11.

[0083] In this embodiment, both the first fire filter 41 and the second fire filter 42 are provided with multiple mesh holes 401, which is simple in structure and can well meet the usage needs of the first fire filter 41 and the second fire filter 42. In the first fire filter 41 and the second fire filter 42, the total projected area of ​​the overlapping area of ​​the multiple mesh holes 401 in the first direction is greater than or equal to the projected area of ​​the pressure relief hole 11. It should be noted that this implicitly discloses the structural feature that the mesh holes 401 on the first fire filter 41 and the second fire filter 42 are not directly opposite each other in the first direction. This can increase the path of the flame from the second fire filter 42 to the first fire filter 41 and through the first fire filter 41, so that the second fire filter 42 and the first fire filter 41 can play a better role in filtering and blocking the flame, thereby further reducing the probability of flames spraying out of the battery pack and improving the safety performance of the battery pack.

[0084] In this embodiment, the total projected area of ​​the overlapping region of the multiple mesh holes 401 in the first fire filter 41 and the second fire filter 42 is greater than or equal to the projected area of ​​the pressure relief hole 11. This can effectively reduce the obstruction of airflow by the flame arrestor 40, so that when the battery pack experiences thermal runaway, the high-temperature and high-pressure gas can pass through the second fire filter 42 and the first fire filter 41 and be efficiently discharged from the pressure relief hole 11. This allows the explosion-proof valve 100 to perform explosion-proof pressure relief operations stably and efficiently, thus giving the battery pack excellent safety performance.

[0085] In some examples of this invention, the area of ​​a single mesh 401 can be greater than or equal to 2 mm. 2 and less than or equal to 4mm 2 .

[0086] In this embodiment, the area of ​​a single mesh 401 is set to be greater than or equal to 2 mm² and less than or equal to 4 mm². 2This allows the mesh 401 to have suitable dimensions so that the first and second fire filters 41 and 42 can effectively filter the flame while allowing airflow to pass smoothly and stably through the flame arrestor 40. This enables the explosion-proof valve 100 to reliably and stably perform pressure relief operations. Furthermore, the total area of ​​the overlapping region of the mesh 401 on the projection plane of the first and second fire filters 41 in the first direction must meet the requirements. For example, the area of ​​a single mesh 401 can be 2 mm². 2 2.2mm 2 2.5mm 2 3mm 2 4mm 2 etc.

[0087] In some examples of this utility model, the distance between adjacent meshes 401 can be greater than or equal to 1.5 mm and less than or equal to 3 mm.

[0088] The distance between adjacent mesh openings 401 is set to be greater than or equal to 1.5 mm and less than or equal to 3 mm. This ensures a suitable spacing between adjacent mesh openings 401, allowing the first fire filter mesh 41 and the second fire filter mesh 42 to have good structural strength and perform good heat conduction and fire filtering. It also ensures that the total area of ​​the mesh openings 401 on the first fire filter mesh 41 and the second fire filter mesh 42 is sufficient to meet the total area of ​​the mesh openings 401 in the overlapping area, thereby satisfying the venting requirements of the explosion-proof valve 100 during pressure relief. For example, the distance between adjacent mesh openings 401 can be 1.5 mm, 1.6 mm, 1.8 mm, 2.5 mm, 3 mm, etc.

[0089] In some embodiments of this utility model, both the first fire filter 41 and the second fire filter 42 can be riveted to the valve body 10. This allows the first fire filter 41 and the second fire filter 42 to be stably and reliably fixed to the valve body 10, facilitating the assembly of the explosion-proof valve 100. For example, the second fire filter 42 can have a connecting flange that extends towards the valve body 10 along a first direction and is riveted to the valve body 10, thus facilitating the arrangement of the first fire filter 41 and the second fire filter 42 in the first direction.

[0090] In some embodiments of this utility model, reference is made to Figure 4 and Figure 7 As shown, a sealing groove may be provided on the side of the valve body 10 facing the flame arrester 40. The sealing groove extends in an annular shape along the circumference of the valve body 10. The explosion-proof valve 100 may also be provided with a second sealing ring, which is located in the sealing groove.

[0091] In this embodiment, a second sealing ring is provided, which has a simple structure. When the explosion-proof valve 100 is assembled on the housing, the valve body 10 can be sealed to the housing through the second sealing ring. This allows the internal space of the housing to be reliably connected to the external space through the pressure relief hole 11 or the airflow channel 201. As a result, the explosion-proof valve 100 can stably perform the functions of explosion-proof pressure relief, pressure balancing, and reducing condensation in the battery pack, making the operation of the explosion-proof valve 100 more stable.

[0092] The following is for reference. Figures 1-8 A battery pack according to a second aspect embodiment of the present invention is described.

[0093] like Figures 1-8 As shown, other components and operations of the battery pack according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0094] According to the battery pack of this utility model embodiment, by setting the explosion-proof valve 100 of the first aspect embodiment, and by setting the moisture-blocking component 30 and the flame arrester 40, the moisture-blocking component 30 is set in the airflow channel 201 of the pressure relief component 20 to conduct or block the exhaust pipe, and the flame arrester 40 is set on one side of the valve body 10 in the first direction. The structure is simple and the arrangement is reasonable, so that the explosion-proof valve 100 can effectively reduce the condensation in the battery pack through the moisture-blocking component 30, and effectively prevent flames from shooting out of the battery pack through the flame arrester 40, thereby greatly improving the safety performance of the battery pack. The flame arrester 40 is provided with an avoidance hole 402, so that the pressure relief component 20 and the flame arrester 40 can be arranged more conveniently and compactly on the valve body 10, so that the explosion-proof valve 100 can be more conveniently arranged on the box.

[0095] The following will refer to Figures 1-8 This invention describes a battery pack according to a specific embodiment of the present invention.

[0096] like Figures 1-8 As shown, the battery pack includes a housing and an explosion-proof valve 100, which is mounted on the housing. The explosion-proof valve 100 includes a valve body 10, a pressure relief assembly 20, a moisture barrier assembly 30, a flame arrester 40, a sleeve 50, a protective cover 70, and a breathable membrane 60.

[0097] The valve body 10 is provided with a pressure relief hole 11, a limiting groove 12 and a sealing groove. The valve body 10 has a cuboid structure. The dimension of the valve body 10 in the first direction can be set between 18mm and 25mm to meet the assembly requirements of the pressure relief component 20 in the explosion-proof valve 100 and to keep the size small. The length dimension of the valve body 10 can be set between 90mm and 120mm, and the width dimension of the valve body 10 can be set between 60mm and 80mm to ensure that the valve body 10 has sufficient assembly dimensions for the assembly arrangement of the pressure relief component 20 and the like, and to keep the volume of the valve body 10 small to reduce the probability of interference with other structures of the vehicle during vehicle assembly, thus facilitating the vehicle assembly of the battery pack.

[0098] The limiting groove 12 is provided on one side of the valve body 10 in the first direction, and the pressure relief hole 11 penetrates the valve body 10 along the first direction. The limiting groove 12 is connected to the pressure relief hole 11. The pressure relief assembly 20 includes a top cover 21, a connector 22, and a second elastic member 23. The top cover 21 is located in the limiting groove 12 and abuts against the bottom of the limiting groove 12 and is sealed by a first sealing ring so that the top cover 21 covers the pressure relief hole 11. The connector 22 is a tube extending in the first direction. One end of the connector 22 is threaded to the top cover 21 and the other end extends out to the other side of the valve body 10. The top cover 21 and the connector 22 cooperate to form an airflow channel 201. An assembly groove communicating with the airflow channel 201 is provided on the side of the top cover 21 away from the connector 22. A breathable membrane 60 is provided in the assembly groove and covers the opening of the airflow channel 201. A protective cover 70 is provided to cover the opening of the assembly groove. A third sealing ring is also provided in the assembly groove. The third sealing ring abuts against the breathable membrane 60, which can play a certain limiting and fixing role for the breathable membrane 60, so that the breathable membrane 60 can stably cover the airflow channel 201. The second elastic element 23 is sleeved outside the connector 22 and its two ends are connected to the valve body 10 and the connector 22 respectively. The second elastic element 23 is a spring and is located inside the sleeve 50.

[0099] A sealing groove is provided on the other side of the valve body 10, and a second sealing ring is provided in the sealing groove. The sleeve 50 is sleeved on the outside of the connector 22 and one end is connected to the valve body 10. The space inside the sleeve 50 is connected to the internal space of the box. For example, the valve body 10 may be provided with a connection structure that cooperates with the sleeve 50, and a through hole structure is provided at the connection structure to allow the space inside the sleeve 50 to communicate with the space inside the box.

[0100] The moisture-blocking component 30 is disposed within the airflow channel 201 of the connector 22 and located at the end of the connector 22 opposite to the top cover 21. The moisture-blocking component 30 includes a sealing component 31, a support pad 34, a first elastic element 32, and a fixing component 33. The fixing component 33 is fixedly connected to the connector 22 and has a receiving groove. The first elastic element 32 is disposed within the receiving groove and connected to the support pad 34. The support pad 34 is disposed between the sealing component 31 and the fixing component 33. The fixing component 33 is located on the side of the sealing component 31 opposite to the top cover 21. The fixing component 33 has an air inlet communicating with the space within the receiving groove and the sleeve 50, and a flow hole communicating with the airflow channel 201.

[0101] The flame arrestor 40 includes a first flame filter 41 and a second flame filter 42. Both the first flame filter 41 and the second flame filter 42 are riveted to the valve body 10. The first flame filter 41 is located on the side of the second flame filter 42 facing the valve body 10. Both the first flame filter 41 and the second flame filter 42 are provided with clearance holes 402. The sleeve 50 passes through the clearance holes 402 and is connected to the valve body 10. Both the first flame filter 41 and the second flame filter 42 are provided with mesh holes 401, and the shape of the mesh holes 401 can be reasonably set according to needs.

[0102] When assembling the explosion-proof valve 100 with the enclosure, refer to Figure 1 and Figure 2 As shown, the explosion-proof valve 100 can be assembled with the housing through a blind hole bushing structure. This can effectively prevent cracking of the housing at the mounting holes and torque attenuation of the connecting parts 22 when the housing is made of composite materials, so that the explosion-proof valve 100 can be stably and reliably installed and fixed on the housing.

[0103] When the battery pack is operating normally, the moisture-blocking component 30 blocks the airflow channel 201, and the top cover 21 seals the pressure relief hole 11, ensuring a stable seal at the explosion-proof valve 100 against the enclosure. The moisture-blocking component 30 effectively prevents external air from flowing into the enclosure and causing condensation. When the pressure difference between the external and internal air pressures of the battery pack reaches the pressure difference required for stable operation in a humid and hot environment—for example, when the pressure difference reaches 2 kPa-4 kPa—the moisture-blocking component 30, under the influence of external air pressure, opens the airflow channel 201, allowing external air to flow into the enclosure to balance the pressure. In the event of thermal runaway of the battery pack, the flame arrestor 40 filters the flame inside the enclosure, preventing the flame from being ejected from the explosion-proof valve 100 outside the battery pack. Under the pressure inside the enclosure, the top cover 21 opens the pressure relief hole 11, allowing high-temperature and high-pressure gas to be discharged from the pressure relief hole 11 to the outside of the battery pack. This provides the battery pack with functions of balancing gas pressure, relieving thermal runaway pressure, moisture barrier, and flame arrestor, thus improving the structural safety, electrical safety, and thermal safety performance of the battery pack and significantly enhancing its overall safety performance.

[0104] This embodiment incorporates a moisture-blocking component 30 and a flame arrester 40. The moisture-blocking component 30 is positioned in the airflow channel 201 of the pressure relief component 20 to either open or block the exhaust pipe. The flame arrester 40 is positioned on one side of the valve body 10 in the first direction. The structure is simple and the arrangement is reasonable. This allows the explosion-proof valve 100 to effectively reduce condensation inside the battery pack through the moisture-blocking component 30, and effectively prevents flames from escaping from the battery pack through the flame arrester 40, thereby significantly improving the safety performance of the battery pack. The flame arrester 40 is provided with an avoidance hole 402, which makes it easier and more compact to arrange the pressure relief component 20 and the flame arrester 40 on the valve body 10, thus allowing the explosion-proof valve 100 to be more easily placed on the enclosure.

[0105] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0107] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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 the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0109] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, characterized in that, For the housing of the battery pack, the explosion-proof valve includes: The valve body (10) is provided with a pressure relief hole (11), which extends through the valve body (10) in a first direction; Pressure relief assembly (20), the pressure relief assembly (20) is disposed on the valve body (10), the pressure relief assembly (20) is used to close and open the pressure relief hole (11), the pressure relief assembly (20) forms an airflow channel (201) extending along the first direction, the airflow channel (201) is adapted to connect the internal space of the box with the external space; A moisture barrier component (30) is configured to open or block the airflow passage (201); A flame arrester (40) is provided on one side of the valve body (10) in the first direction. The flame arrester (40) is adapted to be arranged in the housing. The flame arrester (40) is provided with a clearance hole (402) that passes through the flame arrester (40) along the first direction. The pressure relief assembly (20) is partially inserted through the clearance hole (402).

2. The explosion-proof valve according to claim 1, characterized in that, The moisture barrier component (30) is disposed at one end of the airflow channel (201) opposite to the valve body (10), and the moisture barrier component (30) includes: Sealing component (31); The fastener (33) and the first elastic member (32) are fixedly connected to the side wall of the airflow channel (201). The first elastic member (32) is deformable along the first direction and its two ends abut against the blocking member (31) and the fastener (33) respectively. The first elastic member (32) always drives the blocking member (31) to block the airflow channel (201).

3. The explosion-proof valve according to claim 1, characterized in that, The pressure relief assembly (20) includes: Top cover (21), the top cover (21) is sealed to the pressure relief hole (11); A connector (22) extends along the first direction and passes through the clearance hole (402). One end of the connector (22) is connected to the top cover (21). The top cover (21) and the connector (22) cooperate to form the airflow channel (201). The airflow channel (201) passes through the top cover (21) and the connector (22) along the first direction. The second elastic element (23) is sleeved on the connector (22). In the first direction, the second elastic element (23) is located on the side of the valve body (10) away from the top cover (21), and its two ends are respectively connected to the valve body (10) and the connector (22). The second elastic element (23) always pushes the connector (22) away from the valve body (10) to move so that the top cover (21) closes the pressure relief hole (11).

4. The explosion-proof valve according to claim 3, characterized in that, It also includes a sleeve (50), which is a heat-resistant component. The sleeve (50) is located outside the connector (22) and the second elastic component (23). One end of the sleeve (50) is closed and the other end is connected to the valve body (10).

5. The explosion-proof valve according to claim 3, characterized in that, On the projection plane perpendicular to the first direction, the ratio of the projected area of ​​the top cover (21) to the projected area of ​​the valve body (10) is greater than or equal to three-quarters, and the ratio of the projected area of ​​the pressure relief hole (11) to the projected area of ​​the top cover (21) is greater than or equal to two-thirds.

6. The explosion-proof valve according to any one of claims 1-5, characterized in that, The flame arrester (40) and the valve body (10) are arranged at a distance in the first direction. The flame arrester (40) includes a first fire filter (41) and a second fire filter (42). Both the first fire filter (41) and the second fire filter (42) are connected to the valve body (10). The first fire filter (41) and the second fire filter (42) are arranged at a distance in the first direction. Both the first fire filter (41) and the second fire filter (42) are provided with the clearance hole (402).

7. The explosion-proof valve according to claim 6, characterized in that, The first fire filter (41) is disposed on the side of the second fire filter (42) facing the valve body (10). In the first direction, the distance between the first fire filter (41) and the surface of the valve body (10) facing away from the flame arrester (40) is greater than or equal to 10 mm and less than or equal to 13 mm, and the distance between the first fire filter (41) and the second fire filter (42) is greater than or equal to 3 mm and less than or equal to 5 mm.

8. The explosion-proof valve according to claim 6, characterized in that, Both the first fire filter (41) and the second fire filter (42) are provided with a plurality of mesh holes (401). On the projection plane perpendicular to the first direction, the total projection area of ​​the overlapping area of ​​the plurality of mesh holes (401) in the first fire filter (41) and the second fire filter (42) is greater than or equal to the projection area of ​​the pressure relief hole (11).

9. The explosion-proof valve according to claim 8, characterized in that, The area of ​​a single mesh opening (401) is greater than or equal to 2 mm. 2 and less than or equal to 4mm 2 And / or, the distance between adjacent meshes (401) is greater than or equal to 1.5 mm and less than or equal to 3 mm.

10. A battery pack, characterized in that, include: The enclosure and the explosion-proof valve according to any one of claims 1-9, wherein the explosion-proof valve is disposed in the enclosure.

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