Explosion-proof breather butterfly valve for battery pack

Abstract

The utility model discloses a kind of explosion-proof breather butterfly valves for battery pack, including valve body and valve core assembly, first pressure relief passage and second pressure relief passage are formed with relatively distribution inside valve body, valve core assembly includes relatively distributed first valve core and second valve core, first valve core and second valve core are connected valve body by elastic rotating component, and first pressure relief passage and second pressure relief passage are covered respectively, elastic rotating component can drive first valve core and second valve core synchronous rotation relative to valve body under external force, to open first pressure relief passage and second pressure relief passage, first valve core and second valve core can also be driven synchronous reset based on self elastic restoring force, breathing gas permeable membrane and cover plate are respectively equipped on first valve core and second valve core, to make first valve core and second valve core cooperate with first pressure relief passage and second pressure relief passage respectively and form first breathing passage and second breathing passage, can effectively shorten valve length, reduce space occupancy, and enlarge pressure relief flow area, realize fast pressure relief.

Description

Technical Field

[0001] This utility model relates to the field of vent valve technology, specifically to an explosion-proof vent valve for battery packs. Background Technology

[0002] Battery packs provide energy for new energy products such as pure electric vehicles and hybrid vehicles. During the charging and discharging process, some chemical energy is converted into heat energy, which causes the temperature and pressure inside the pack to rise. In the event of a malfunction, spontaneous combustion due to a collision, or high-rate charging and discharging, the temperature and pressure inside the pack may increase instantaneously. It is necessary to release the pressure of the pack in time through an explosion-proof vent valve to prevent further and more serious situations from occurring.

[0003] like Figure 1 As shown, existing explosion-proof vent valves typically use a spring to elastically engage with the valve core and valve cover to form a breathing passage 1' and an exhaust passage 2'. The breathing passage 1' balances the internal and external pressures, while the exhaust passage 2' enables pressure relief and explosion when the pressure difference is large.

[0004] However, existing explosion-proof vent valves have relatively long valve cores, and components such as springs and valve cores are distributed inside the battery pack, which occupies internal space and limits the compact design of the entire pack structure. At the same time, the pressure relief efficiency is low, and the response capability is limited when facing sudden high-temperature and high-pressure gas impacts. In addition, after experiencing high-temperature, high-pressure gas flow and burning, its key components such as sealing rings, springs and valve core skeletons are prone to deformation or performance degradation, and cannot be restored to the factory design standard, resulting in the valve body being reused, which has low reliability.

[0005] Therefore, providing a compact, fast-release, stable and reliable explosion-proof vent valve has become an urgent problem to be solved in this field. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an explosion-proof and breathable butterfly valve for battery packs that is compact, stable and reliable.

[0007] To achieve the above objectives, the present invention provides an explosion-proof and breathable butterfly valve for battery packs, comprising a valve body and a valve core assembly.

[0008] The valve body has a first pressure relief channel and a second pressure relief channel that are relatively distributed inside.

[0009] The valve core assembly includes a first valve core and a second valve core that are relatively distributed. The first valve core and the second valve core are connected to the valve body through an elastic rotating assembly and respectively cover the first pressure relief channel and the second pressure relief channel. The elastic rotating assembly can drive the first valve core and the second valve core to rotate synchronously relative to the valve body under the action of external force to open the first pressure relief channel and the second pressure relief channel. It can also drive the first valve core and the second valve core to reset synchronously based on its own elastic restoring force. The first valve core and the second valve core are respectively provided with a breathable membrane and a cover plate so that the first valve core and the second valve core cooperate with the first pressure relief channel and the second pressure relief channel to form a first breathing channel and a second breathing channel, respectively.

[0010] Furthermore, the valve body is also provided with a partition, a first mounting cavity and a second mounting cavity. The partition is used to separate the first pressure relief channel and the second pressure relief channel. The first mounting cavity and the second mounting cavity are respectively distributed above the first pressure relief channel and the second pressure relief channel.

[0011] Furthermore, valve core sealing gaskets are respectively provided in the first and second mounting cavities.

[0012] Furthermore, a first set of pivot holes is provided on the circumferential surface of the valve body corresponding to both ends of the partition.

[0013] Furthermore, the opposite ends of the first valve core and the second valve core are respectively provided with a first connector and a second connector, the first connector and the second connector are staggered and can fit together to form a second set of rotating shaft holes.

[0014] Furthermore, the elastic rotation assembly includes a rotating shaft and a torsional elastic element. The two ends of the rotating shaft pass through the first set of rotating shaft holes and the second set of rotating shaft holes, respectively. The torsional elastic element is disposed on the rotating shaft, and elastic arms extend from both ends and are disposed on the cover plate.

[0015] Furthermore, the first valve core and the second valve core are respectively provided with a placement groove for accommodating the breathable membrane therein, and the placement groove and the surface of the cover plate are respectively provided with small breathing holes, and the cover plate covers the breathable membrane.

[0016] Furthermore, a valve body sealing gasket is provided at the bottom of the valve body.

[0017] The explosion-proof breathable butterfly valve for battery packs provided by this utility model opens the valve core by rotation and integrates the breathing channel and pressure relief channel inside the valve body, which can effectively shorten the valve length and reduce the space occupation of the valve body, making the valve body structure compact. At the same time, the elastic rotating component can simultaneously open the first valve core and the second valve core under the action of external force of high pressure difference, and simultaneously and completely open the first pressure relief channel and the second pressure relief channel, which can expand the pressure relief flow area, thereby achieving rapid pressure relief, effectively preventing explosion, and ensuring the stability and reliability of the valve body. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of an explosion-proof vent valve in the prior art;

[0020] Figure 2 This is a schematic diagram showing the open state of the explosion-proof ventilated butterfly valve for the battery pack in this utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the explosion-proof and breathable butterfly valve for the battery pack in the present invention in the open state;

[0022] Figure 4 This is a schematic diagram showing the closed state of the explosion-proof ventilated butterfly valve for the battery pack in this utility model;

[0023] Figure 5 This is a cross-sectional schematic diagram of the closed state of the explosion-proof and ventilated butterfly valve for the battery pack in this utility model;

[0024] Figure 6 This is a schematic diagram of the bottom structure of the explosion-proof and breathable butterfly valve for the battery pack in this utility model;

[0025] Figure 7 This is an exploded structural diagram of the explosion-proof and breathable butterfly valve for the battery pack in this utility model;

[0026] Figure 8 This is a schematic diagram of the overall structure of the valve core assembly in this utility model;

[0027] Figure 9 This is an exploded view of the valve core assembly in this utility model;

[0028] Figure label:

[0029] 1. Valve body; 11. Partition plate; 111. Top surface; 112. First inclined surface; 113. Second inclined surface; 12. First mounting cavity; 13. Second mounting cavity; 14. First valve core sealing gasket; 15. Second valve core sealing gasket; 16. Valve body sealing gasket; 17. First set of rotating shaft holes;

[0030] 2. Valve core assembly; 21. First valve core; 211. First connector; 22. Second valve core; 221. Second connector; 23. Elastic rotating assembly; 231. Rotating shaft; 232. Torsional elastic element; 233. Spring ring; 234. Elastic arm; 24. Breathable membrane; 25. Cover plate; 26. Mounting groove; 27. Breathing hole; 28. Second set of rotating shaft holes;

[0031] 3. First pressure relief channel; 4. Second pressure relief channel; 5. First breathing channel; 6. Second breathing channel. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0033] See Figures 2 to 6 The illustration shows an example of an explosion-proof and breathable butterfly valve for a battery pack provided by this utility model.

[0034] As shown in the figure, the explosion-proof ventilated butterfly valve for the battery pack in this example mainly includes valve body 1 and valve core assembly 2.

[0035] The valve body 1 has a first pressure relief channel 3 and a second pressure relief channel 4 that are relatively distributed inside. The valve core assembly 2 includes a first valve core 21 and a second valve core 22 that are relatively distributed. The first valve core 21 and the second valve core 22 are connected to the valve body 1 through an elastic rotating assembly 23 and respectively cover the first pressure relief channel 3 and the second pressure relief channel 4. The elastic rotating assembly 23 can drive the first valve core 21 and the second valve core 22 to rotate synchronously relative to the valve body 1 under the action of external force, so as to open the first pressure relief channel 3 and the second pressure relief channel 4. It can also drive the first valve core 21 and the second valve core 22 to reset synchronously based on its own elastic restoring force. By rotating, the pressure relief channel is fully opened, which can expand the pressure relief flow area, thereby achieving rapid pressure relief, effectively preventing explosion, and ensuring the stability and reliability of the valve body.

[0036] Furthermore, the first valve core 21 and the second valve core 22 are respectively provided with a breathable membrane 24 and a cover plate 25, so that the first valve core 21 and the second valve core 22 cooperate with the first pressure relief channel 3 and the second pressure relief channel 4 to form the first breathing channel 5 and the second breathing channel 6, thereby combining the breathing channel and the pressure relief channel and integrating them inside the valve body 1, which can effectively shorten the valve length and reduce the space occupancy rate of the valve body.

[0037] Combination Figures 2 to 6The valve body 1 has a partition 11 inside, which is located in the middle area of ​​the valve body 1. The partition 11 divides the internal space of the valve body 1 into a first pressure relief channel 3 and a second pressure relief channel 4 that are relatively distributed, so that the valve body 1 is mounted on the battery pack. The first pressure relief channel 3 and the second pressure relief channel 4 can connect the inside and outside of the battery pack, so that the gas inside and outside the battery pack can flow through the first pressure relief channel 3 and the second pressure relief channel 4.

[0038] Combination Figure 3 and Figure 6 Preferably, the partition 11 is configured as a triangular pyramid structure, with the top surface 111 horizontally distributed in the top region of the valve body 1. The first inclined surface 112 and the second inclined surface 113 are inclined to both sides along the middle surface of the valve body 1, respectively. In this way, the first inclined surface 112 and the second inclined surface 113 constitute the inner wall of the first pressure relief channel 3 and the second pressure relief channel 4, respectively. This causes the inner wall of the first pressure relief channel 3 and the second pressure relief channel 4 to gradually contract from the inside of the battery pack to the outside, so as to gradually reduce the pressure relief cross-section of the gas inside the battery pack and increase the gas flow rate. When a large pressure difference is generated between the inside and outside of the battery pack, the gas inside the battery pack can be discharged to the outside at a relatively fast speed along the first pressure relief channel 3 and the second pressure relief channel 4, thereby achieving rapid pressure relief and preventing the battery pack from exploding.

[0039] Combination Figure 7 Furthermore, the valve body 1 also has a first mounting cavity 12 and a second mounting cavity 13 formed inside for cooperating with the valve core assembly 2. The first mounting cavity 12 and the second mounting cavity 13 are respectively distributed above the first pressure relief channel 3 and the second pressure relief channel 4, so that the valve core assembly 2 can be set in the first mounting cavity 12 and the second mounting cavity 13 and cover the first pressure relief channel 3 and the second pressure relief channel 4, thereby separating the inside and outside of the battery pack.

[0040] Combination Figures 2 to 7 Meanwhile, the first mounting cavity 12 and the second mounting cavity 13 are respectively provided with a first valve core sealing gasket 14 and a second valve core sealing gasket 15, and the first valve core sealing gasket 14 and the second valve core sealing gasket 15 are distributed around the ports of the first pressure relief channel 3 and the second pressure relief channel 4, so that when the valve core assembly 2 is set in the first mounting cavity 12 and the second mounting cavity 13, it can abut against the first valve core sealing gasket 14 and the second valve core sealing gasket 15, thereby effectively sealing the fitting gap between the valve core assembly 2 and the valve body 1, preventing gas inside the battery pack from leaking from the fitting gap between the valve core assembly 2 and the valve body 1, and ensuring the stability and reliability of the valve body.

[0041] Correspondingly, a valve body sealing gasket 16 is provided at the bottom of the valve body 1. The valve body sealing gasket 16 is distributed around the port formed by the first pressure relief channel 3 and the second pressure relief channel 4 to effectively seal the fitting gap between the valve body 1 and the battery pack, and prevent gas inside the battery pack from leaking from the fitting gap between the valve body 1 and the battery pack.

[0042] Combination Figure 7 In order to stably connect the valve body 1 and the valve core assembly 2, a first set of rotating shaft holes 17 are provided on the two ends of the partition 11 on the circumferential surface of the valve body 1, so that the valve core assembly 2 can be stably installed in the first mounting cavity 12 and the second mounting cavity 13 through the first set of rotating shaft holes 17.

[0043] Combination Figures 7 to 9 In conjunction with this, the valve core assembly 2 includes a first valve core 21, a second valve core 22, an elastic rotating assembly 23, a breathable membrane 24, and a cover plate 25. The first valve core 21 and the second valve core 22 are disposed in the first mounting cavity 12 and the second mounting cavity 13 through the elastic rotating assembly 23, respectively covering the first pressure relief channel 3 and the second pressure relief channel 4, so as to effectively isolate the inside and outside of the battery pack. The elastic rotating assembly 23 can drive the first valve core 21 and the second valve core 22 to rotate synchronously relative to the valve body 1 under the action of external force, so as to open the first pressure relief channel 3 and the second pressure relief channel 4 synchronously. It can also drive the first valve core 21 and the second valve core 22 to reset synchronously based on its own elastic restoring force. The first valve core 21 and the second valve core 22 are respectively provided with a breathable membrane 24 and a cover plate 25, so that the first valve core 21 and the second valve core 22 cooperate with the first pressure relief channel 3 and the second pressure relief channel 4 through the breathable membrane 24 and the cover plate 25 to form the first breathing channel 5 and the second breathing channel 6, so as to realize the exhalation and exhaust of the battery pack.

[0044] The first valve core 21 and the second valve core 22 are respectively provided with mounting grooves 26 adapted to the breathing membrane 24, so that the breathing membrane 24 can be accommodated in the mounting grooves 26. The cover plate 25 is disposed on the breathing membrane 24, covering the breathing membrane 24, so that the cover plate 25 can protect the breathing membrane 24.

[0045] Furthermore, the mounting grooves 26 of the first valve core 21 and the second valve core 22 and the surface of the cover plate 25 are respectively provided with breathing holes 27, so that the first valve core 21 and the second valve core 22 are connected to the breathing membrane 24 and the cover plate 25 respectively through the breathing holes 27.

[0046] Here, the breathable membrane 24 is a conventional technique in the field. As an example, the breathable membrane 3 can be made of existing e-PTFE breathable membrane.

[0047] Combination Figure 4 and Figure 5Furthermore, the first pressure relief channel 3, the first valve core 21, the breathable membrane 24 disposed on the first valve core 21 and the cover plate 25 are connected to form the first breathing channel 5, and the second pressure relief channel 4, the second valve core 22, the breathable membrane 24 disposed on the second valve core 22 and the cover plate 25 are connected to form the second breathing channel 6. When there is a small pressure difference between the inside and outside of the battery pack, the gas inside the battery pack can be discharged along the first breathing channel 5 and the second breathing channel 6 to realize the breathing of the battery pack and maintain the pressure difference balance between the inside and outside of the battery pack.

[0048] Correspondingly, gas outside the battery pack can also enter the battery pack through the first breathing channel 5 and the second breathing channel 6, which will not be elaborated here.

[0049] The first breathing channel 5 and the second breathing channel 6 thus formed are combined with the first pressure relief channel 3 and the second pressure relief channel 4 into a unified channel and integrated into the valve body. Compared with the existing explosion-proof vent valves that separate the breathing channel and the pressure relief channel, this solution can effectively reduce the space occupied by opening the channel and further improve the structural compactness of the valve body.

[0050] Combination Figures 7 to 9 To ensure that the high-temperature and high-pressure gas inside the battery pack can be quickly released when there is a large pressure difference between the inside and outside of the battery pack, the elastic rotating component 23 can drive the first valve core 21 and the second valve core 22 to rotate synchronously relative to the valve body 1 under the external force generated by the large pressure difference between the inside and outside of the battery pack. This allows the first pressure relief channel 3 and the second pressure relief channel 4 to be opened synchronously, quickly and completely, connecting the inside and outside of the battery pack and expanding the pressure relief flow area to achieve rapid pressure relief and effectively prevent explosions caused by untimely pressure relief.

[0051] Specifically, the first valve core 21 and the second valve core 22 are distributed opposite to each other. The first connector 211 and the second connector 221 are respectively provided at the opposite ends of the first valve core 21 and the second valve core 22. The first connector 211 and the second connector 221 are respectively formed with rotating shaft holes and are staggered so that the first connector 211 and the second connector 221 can fit into each other and connect the rotating shaft holes inside the first connector 211 and the second connector 221 to form a second set of rotating shaft holes 28.

[0052] Meanwhile, after the first connector 211 and the second connector 221 are fitted together, a gap is formed in the middle of the mating area of ​​the first connector 211 and the second connector 221, which facilitates the assembly of the elastic rotating assembly 23.

[0053] Furthermore, the elastic rotation assembly 23 includes a rotating shaft 231 and a torsional elastic element 232. The rotating shaft 231 is mounted on the top surface 111 of the partition plate 11 of the valve body 1, and both ends of the rotating shaft 231 pass through the second set of rotating shaft holes 28 and the first set of rotating shaft holes 17 on the valve body 1, respectively, thereby connecting the first valve core 21, the second valve core 22 and the valve body 1, ensuring that the first valve core 21 and the second valve core 22 can be stably and distributed in the first mounting cavity 12 and the second mounting cavity 13.

[0054] Meanwhile, the first valve core 21 and the second valve core 22 are sleeved on the rotating shaft 231 and can rotate synchronously around the rotating shaft 231.

[0055] Furthermore, the torsional elastic element 232 is distributed in the fitting gap between the first connecting member 211 and the second connecting member 221, and is disposed on the rotating shaft 231. Preferably, the torsional elastic element 232 is composed of a torsional spring, so that the spring ring 233 of the torsional elastic element 232 can be sleeved on the rotating shaft 231, and elastic arms 234 extend from both ends of the spring ring 233 respectively. The elastic arms 234 are disposed on the cover plates 25 of the first valve core 21 and the second valve core 22 respectively.

[0056] As an example, the torsion elastic element 232 can also be composed of a torsion leaf spring or a spring plate, etc.

[0057] Combination Figure 4 and Figure 5 In the initial state, the torsional elastic element 232 is in a pre-tightened state. The elastic arm 234 applies a pre-tightening force to the cover plate 25 of the first valve core 21 and the second valve core 22 respectively, so that the first valve core 21 and the second valve core 22 can be stably set in the first mounting cavity 12 and the second mounting cavity 13, and ensure that the first valve core 21 and the second valve core 22 are in close contact with the first valve core sealing gasket 14 and the second valve core sealing gasket 15 respectively, thereby effectively sealing the fitting gap between the valve core assembly 2 and the valve body 1, and separating the inside and outside of the battery pack.

[0058] Combination Figure 2 and Figure 3 When a large pressure difference is generated inside and outside the battery pack, the gas inside the battery pack will exert a thrust on the first valve core 21 and the second valve core 22 towards the outside of the battery pack. When the thrust is greater than the preload of the torsional elastic element 232, the first valve core 21 and the second valve core 22 will rotate synchronously towards the outside of the battery pack around the rotating shaft 231 under the action of the thrust, and the first valve core 21 and the second valve core 22 will rotate closer to each other to present a butterfly-shaped distribution.

[0059] At the same time, the cover plates 25 on the first valve core 21 and the second valve core 22 will push the elastic arms 234 at both ends of the torsional elastic member 232 to move and twist synchronously towards the outside of the battery pack, so as to open the first valve core 21 and the second valve core 22, and simultaneously fully open the first pressure relief channel 3 and the second pressure relief channel 4, connecting the inside and outside of the battery pack, so that the gas inside the battery pack can be quickly ejected along the first pressure relief channel 3 and the second pressure relief channel 4 to achieve rapid pressure relief.

[0060] When the cover plate 25 on the first valve core 21 and the second valve core 22 pushes the elastic arms 234 at both ends of the torsional elastic member 232 to move and twist towards the outside of the battery pack, the elastic arms 234 will cause the spring coil 233 to contract, generate elastic deformation, and store elastic force.

[0061] Combination Figure 2 and Figure 3 Furthermore, based on the elastic force of the torsional elastic element 232, when the first valve core 21 and the second valve core 22 rotate and approach each other in a butterfly-shaped distribution, the first valve core 21 and the second valve core 22 are respectively distributed at opposite angles to the valve body 1. This allows the high-temperature and high-pressure gas inside the battery pack to be discharged along the first pressure relief channel 3 and the second pressure relief channel 4, respectively. The gas can be discharged in opposite directions by changing the spray angle through the inner surfaces of the first valve core 21 and the second valve core 22, thus achieving directional discharge of the high-temperature and high-pressure gas. At the same time, it can also prevent the high-pressure and high-temperature gas in the first pressure relief channel 3 and the second pressure relief channel 4 from being sprayed in the same direction, causing concentrated ablation and melting of the electrical connectors around the battery pack, thereby ensuring the stability and reliability of the valve body.

[0062] When the high-temperature and high-pressure gas inside the battery pack is released, the thrust exerted by the gas inside the battery pack on the first valve core 21 and the second valve core 22 gradually decreases. Based on its own elastic restoring force, the spring coil 233 will gradually release the stored elastic force to drive the elastic arm 234 to move the cover plate 25 towards the inside of the battery pack, thereby causing the first valve core 21 and the second valve core 22 to rotate synchronously and gradually around the rotating shaft 231 towards the inside of the battery pack.

[0063] Combination Figure 4 and Figure 5 Until the battery pack reaches the internal and external pressure difference balance, the battery pack no longer exerts a thrust on the first valve core 21 and the second valve core 22. The elastic force released by the spring coil 233 will drive the first valve core 21 and the second valve core 22 to rotate synchronously towards the inside of the battery pack, thereby driving the first valve core 21 and the second valve core 22 to reset synchronously, and reposition the first valve core 21 and the second valve core 22 in the first placement cavity 12 and the second placement cavity 13 respectively, covering and closing the first pressure relief channel 3 and the second pressure relief channel 4 to prevent foreign objects from entering the battery pack.

[0064] The elastic rotating assembly 23 thus constitutes a mechanism that engages the first valve core 21, the second valve core 22, and the valve body 1. When the pressure difference between the inside and outside of the battery pack is balanced, it ensures an effective seal between the first valve core 21 and the second valve core 22 and the valve body 1. When the pressure difference between the inside and outside of the battery pack is large, it can quickly open the first pressure relief channel 3 and the second pressure relief channel 4 to achieve rapid pressure relief. During the pressure relief process, it protects the electrical connectors around the battery pack from being burned by high-temperature and high-pressure gas. At the same time, after the pressure relief is completed, it promptly closes the first valve core 21 and the second valve core 22 to re-isolate the inside and outside of the battery pack.

[0065] Compared to existing explosion-proof vent valves that require a certain height or length of space for the valve cover to move axially and open the venting channel, this solution uses the elastic rotating component 23 to drive the first valve core 21 and the second valve core 22 to rotate to achieve opening and resetting. This allows for quick opening and closing of the pressure relief channel and effectively shortens the height of the valve body, making the valve body structure compact and reducing the space occupied by the battery pack.

[0066] Furthermore, compared to the existing venting channels of explosion-proof venting valves, this solution can fully open the first valve core 21 and the second valve core 22, effectively expanding the pressure relief flow area, achieving rapid pressure relief, effectively preventing explosions caused by untimely pressure relief, and improving the reliability of the valve body.

[0067] At the same time, the gas inside the battery pack can be depressurized simultaneously through the dual channels of the first depressurization channel 3 and the second depressurization channel 4, further increasing the depressurization flow area and achieving rapid depressurization.

[0068] The following example illustrates the working process of this utility model in a specific application. It should be noted that the content described here is only a specific application example of this solution and does not constitute a limitation on this solution.

[0069] Combination Figure 4 and Figure 5 If there is a small pressure difference between the inside and outside of the battery pack, the gas inside the battery pack can communicate with the outside through the first breathing channel 5 and the second breathing channel 6. The gas inside the battery pack enters the first valve core 21 and the second valve core 22 along the first pressure relief channel 3 and the second pressure relief channel 4, and then passes through the breathing holes 27 on the first valve core 21 and the second valve core 22, then through the breathing membrane 24, and finally through the breathing holes 27 on the cover plate 25 to exhaust the battery pack to the outside, so as to realize the breathing of the battery pack and maintain the pressure difference balance between the inside and outside of the battery pack.

[0070] Combination Figure 2 and Figure 3If a large pressure difference is generated inside and outside the battery pack, the gas inside the battery pack will exert a thrust on the first valve core 21 and the second valve core 22 towards the outside of the battery pack. When the thrust is greater than the preload of the torsional elastic element 232, the first valve core 21 and the second valve core 22 will rotate synchronously towards the outside of the battery pack around the rotating shaft 231 under the action of the thrust, and simultaneously and completely open the first pressure relief channel 3 and the second pressure relief channel 4, connecting the inside and outside of the battery pack, so that the gas inside the battery pack can be quickly ejected along the first pressure relief channel 3 and the second pressure relief channel 4.

[0071] Furthermore, the inner walls of the first pressure relief channel 3 and the second pressure relief channel 4 gradually contract from the inside of the battery pack to the outside, which can gradually reduce the pressure relief cross-section of the gas inside the battery pack and increase the gas flow rate, so that the gas inside the battery pack can be discharged to the outside at a faster speed along the first pressure relief channel 3 and the second pressure relief channel 4, thereby achieving rapid pressure relief and preventing the battery pack from exploding.

[0072] At the same time, the cover plates 25 on the first valve core 21 and the second valve core 22 push the elastic arms 234 at both ends of the torsional elastic member 232 to move and twist towards the outside of the battery pack, causing the spring coil 233 to contract, generate elastic deformation, and store elastic force.

[0073] When the high-temperature and high-pressure gas inside the battery pack is released, the thrust exerted by the gas inside the battery pack on the first valve core 21 and the second valve core 22 gradually decreases. Based on its own elastic restoring force, the spring coil 233 will gradually release the stored elastic force to drive the elastic arm 234 to move the cover plate 25 towards the inside of the battery pack, thereby causing the first valve core 21 and the second valve core 22 to rotate synchronously and gradually around the rotating shaft 231 towards the inside of the battery pack.

[0074] When the battery pack reaches the internal and external pressure difference balance, the battery pack no longer exerts a thrust on the first valve core 21 and the second valve core 22. The elastic force released by the spring coil 233 will drive the first valve core 21 and the second valve core 22 to rotate synchronously towards the inside of the battery pack, thereby driving the first valve core 21 and the second valve core 22 to reset synchronously, and reposition the first valve core 21 and the second valve core 22 in the first placement cavity 12 and the second placement cavity 13 respectively, covering and closing the first pressure relief channel 3 and the second pressure relief channel 4 to prevent foreign objects from entering the battery pack.

[0075] The explosion-proof breathable butterfly valve for battery packs provided by this utility model opens the valve core by rotation and integrates the breathing channel and pressure relief channel inside the valve body, which can effectively shorten the valve length and reduce the space occupation of the valve body, making the valve body structure compact. At the same time, the elastic rotating component can simultaneously open the first valve core and the second valve core under the action of external force of high pressure difference, and simultaneously and completely open the first pressure relief channel and the second pressure relief channel, which can expand the pressure relief flow area, thereby achieving rapid pressure relief, effectively preventing explosion, and ensuring the stability and reliability of the valve body.

[0076] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof ventilated butterfly valve for a battery pack, comprising a valve body and a valve core assembly, characterized in that, The valve body has a first pressure relief channel and a second pressure relief channel that are relatively distributed inside. The valve core assembly includes a first valve core and a second valve core that are relatively distributed. The first valve core and the second valve core are connected to the valve body through an elastic rotating assembly and respectively cover the first pressure relief channel and the second pressure relief channel. The elastic rotating assembly can drive the first valve core and the second valve core to rotate synchronously relative to the valve body under the action of external force to open the first pressure relief channel and the second pressure relief channel. It can also drive the first valve core and the second valve core to reset synchronously based on its own elastic restoring force. The first valve core and the second valve core are respectively provided with a breathable membrane and a cover plate so that the first valve core and the second valve core cooperate with the first pressure relief channel and the second pressure relief channel to form a first breathing channel and a second breathing channel, respectively.

2. The explosion-proof ventilated butterfly valve for battery packs according to claim 1, characterized in that, The valve body is also provided with a partition, a first mounting cavity and a second mounting cavity. The partition is used to separate the first pressure relief channel and the second pressure relief channel. The first mounting cavity and the second mounting cavity are respectively distributed above the first pressure relief channel and the second pressure relief channel.

3. The explosion-proof ventilated butterfly valve for battery packs according to claim 2, characterized in that, The first and second mounting cavities are respectively provided with valve core sealing gaskets.

4. The explosion-proof ventilated butterfly valve for battery packs according to claim 2, characterized in that, The valve body has a first set of pivot holes corresponding to both ends of the partition plate on its circumferential surface.

5. The explosion-proof ventilated butterfly valve for battery packs according to claim 4, characterized in that, The first valve core and the second valve core are respectively provided with a first connector and a second connector at their opposite ends. The first connector and the second connector are staggered and can fit together to form a second set of rotating shaft holes.

6. The explosion-proof ventilated butterfly valve for battery packs according to claim 5, characterized in that, The elastic rotating assembly includes a rotating shaft and a torsional elastic element. The two ends of the rotating shaft pass through the first set of rotating shaft holes and the second set of rotating shaft holes, respectively. The torsional elastic element is disposed on the rotating shaft, and elastic arms extend from both ends and are disposed on the cover plate.

7. The explosion-proof ventilated butterfly valve for battery packs according to claim 1, characterized in that, The first valve core and the second valve core are respectively provided with a placement groove for accommodating the breathable membrane therein. The placement groove and the surface of the cover plate are respectively provided with small breathing holes. The cover plate covers the breathable membrane.

8. The explosion-proof ventilated butterfly valve for a battery pack according to claim 1, characterized in that, The valve body is provided with a valve body sealing gasket at the bottom.

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