Explosion-proof valve, battery pack and vehicle

Abstract

The invention relates to an anti-explosion valve, a battery pack and a vehicle, the anti-explosion valve comprises a valve body and a valve cover, and the valve body is provided with an exhaust hole; and the valve cover is rotationally connected with the valve body, so that the valve cover can be switched between a closing position for blocking the exhaust hole and an opening position for opening the exhaust hole. By rotationally connecting the valve cover with the valve body, a guide hole can be prevented from being formed in the valve body, so that the hole diameter of the exhaust hole can be set to be larger, the through-flow area of the anti-explosion valve is facilitated, gas can be quickly exhausted when the battery pack is subjected to thermal runaway, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and particularly to an explosion-proof valve, a battery pack, and a vehicle. Background Art

[0002] The new energy vehicle industry has developed rapidly. The battery pack, which accounts for a relatively high production cost, is an important part of electric vehicles. With the continuous progress of battery technology, the battery pack has higher and higher power and energy density, and at the same time, higher requirements are put forward for the thermal safety and thermal protection of the battery pack. It is necessary to ensure that a large amount of gas can be discharged in time when thermal runaway occurs in the battery pack.

[0003] To meet the above requirements, an explosion-proof valve is provided on the box body of the battery pack. The explosion-proof valve generally includes a valve body, a valve core, and a return spring. The valve body is provided with an exhaust hole and a guiding hole. The return spring is sleeved on the valve stem of the valve core, and the valve stem is movably inserted into the guiding hole. When the battery pack is working normally, the valve core abuts against the valve body under the elastic force of the return spring. At this time, the valve core blocks the exhaust hole to keep the explosion-proof valve in the closed position. When thermal runaway occurs in the battery pack, the gas in the battery pack pushes the valve core to move away from the valve body. At this time, the exhaust hole is opened to make the explosion-proof valve in the open position, and the gas in the battery pack is discharged through the explosion-proof valve. In addition to the exhaust hole, the valve body of the above explosion-proof valve also needs to be provided with a guiding hole. In order to ensure the structural strength of the valve body itself, when a guiding hole is provided on the valve body, the aperture of the exhaust hole is usually set to be relatively small, which results in a small flow-through area of the explosion-proof valve and is not conducive to the rapid discharge of gas when thermal runaway occurs in the battery pack, resulting in poor safety of the battery pack. Summary of the Invention

[0004] The present disclosure aims to at least partly solve one of the technical problems in the related art.

[0005] Therefore, the present disclosure provides an explosion-proof valve to improve the safety of the battery pack.

[0006] The explosion-proof valve of the present disclosure includes a valve body and a valve cover. The valve body is provided with an exhaust hole; the valve cover is rotatably connected to the valve body so that the valve cover can be switched between a closed position for blocking the exhaust hole and an open position for opening the exhaust hole.

[0007] Optionally, the valve body is annular.

[0008] Optionally, at least one of the valve body and the valve cover is provided with a magnetic member so that a magnetic attraction force is generated between the valve cover and the valve body.

[0009] Optionally, the valve body is provided with the magnetic member, and the valve cover has a magnetic conductive portion, and a magnetic attraction force is generated between the magnetic member and the magnetic conductive portion.

[0010] Optionally, the valve cover integrally forms the magnetic conduction part, or the valve cover includes a magnetic conduction part and a non-magnetic conduction part. The magnetic conduction part is annular, and the magnetic conduction part is arranged around the non-magnetic conduction part; and / or, the number of the magnetic members is multiple, and the multiple magnetic members are arranged at intervals along the circumferential direction of the exhaust hole.

[0011] Optionally, the valve body is provided with an installation groove, the magnetic member is arranged in the installation groove, and the notch of the installation groove communicates with the exhaust hole.

[0012] Optionally, in the closed position, the magnetic member is arranged corresponding to at least a part of the magnetic conduction part.

[0013] Optionally, the magnetic member is a permanent magnetic member.

[0014] Optionally, the valve body is provided with a stop part, and the stop part abuts against the valve cover when the valve cover is opened by a preset angle, and the preset angle is less than or equal to 90°.

[0015] Optionally, a stop protrusion is arranged on one side of the valve body close to the valve cover, and the stop protrusion forms the stop part; and / or, the valve body is provided with a first connection part, the valve cover is provided with a second connection part, the second connection part is rotationally connected with the first connection part, and the stop part is arranged at the first connection part.

[0016] Optionally, the pore wall of the exhaust hole is provided with a ventilation hole, the ventilation hole communicates with the exhaust hole, and the ventilation hole penetrates through the outer side of the valve body along the radial direction of the exhaust hole.

[0017] Optionally, the explosion-proof valve further includes a ventilation membrane, and the ventilation membrane is connected with the valve body and seals the ventilation hole.

[0018] Optionally, the ventilation membrane is arranged on the side of the ventilation hole close to the exhaust hole.

[0019] Optionally, the number of the ventilation holes is multiple, and one ventilation membrane seals the multiple ventilation holes; and / or, the ventilation holes are strip-shaped, and the width of the ventilation holes is 0.2 mm to 1.0 mm.

[0020] Optionally, the pore wall of the exhaust hole is provided with a communication groove, the communication groove communicates the exhaust hole and the ventilation hole, and the communication groove penetrates through the inner side of the valve body along the radial direction of the exhaust hole; the communication groove includes a first groove section and a second groove section, the first groove section and the second groove section are arranged along the radial direction of the exhaust hole, and the first groove section is arranged closer to the ventilation hole than the second groove section. The width of the first groove section is greater than the width of the second groove section, and a stop platform is formed at the end of the second groove section facing the first groove section. The ventilation membrane is arranged in the first groove section and abuts against the stop platform.

[0021] Optionally, the explosion-proof valve further includes a pressing ring disposed in the first groove section, the pressing ring is connected to the valve body, and the breathable membrane is clamped between the retaining platform and the pressing ring.

[0022] Optionally, the valve body is provided with a magnetic member to generate a magnetic attraction force between the valve cover and the valve body; the valve body is provided with a mounting groove, the magnetic member is disposed in the mounting groove, the mounting groove is disposed on one side of the first groove section in the axial direction of the exhaust hole, and the mounting groove communicates with the first groove section.

[0023] Optionally, the mounting groove is disposed on the side of the first groove section close to the valve cover in the axial direction of the exhaust hole.

[0024] Optionally, the valve body is provided with a magnetic member to generate a magnetic attraction force between the valve cover and the valve body; the valve body is annular, the valve body includes an integrally formed first ring body and a second ring body, the first ring body is disposed on one side of the second ring body in the axial direction of the exhaust hole, and the valve cover is disposed on the side of the first ring body away from the second ring body; the magnetic member is disposed on the first ring body, and the breathable membrane is disposed on the second ring body.

[0025] Optionally, the second ring body includes a thinning portion and a thickening portion, the size of the thinning portion in the radial direction of the exhaust hole is smaller than the size of the thickening portion in the radial direction of the exhaust hole, the breathable hole is disposed in the thinning portion, and the thickening portion is provided with a mounting portion for fixing the explosion-proof valve.

[0026] Optionally, the explosion-proof valve further includes a first sealing ring disposed around the exhaust hole, the first sealing ring is disposed on the side of the valve body close to the valve cover and is connected to the valve body, and at the closed position, the first sealing ring is clamped between the valve body and the valve cover; and / or a second sealing ring disposed around the exhaust hole, the second sealing ring is disposed on the side of the valve body away from the valve cover and is connected to the valve body.

[0027] Optionally, one of the valve body and the valve cover is provided with a concave stop, and the other of the valve body and the valve cover is provided with a convex stop; at the closed position, the convex stop is in sealing fit with the concave stop.

[0028] The battery pack of the present disclosure includes a box body and an explosion-proof valve, the explosion-proof valve is the explosion-proof valve described in any one of the above, and the explosion-proof valve is connected to the box body.

[0029] Optionally, the upper part of the valve cover is rotatably connected to the valve body so that the valve cover switches to the closed position under the action of gravity.

[0030] The vehicle of the present disclosure includes the battery pack described in any one of the above.

[0031] The explosion-proof valve of the present disclosure is used by being installed on the battery pack. When the battery pack is operating normally, the pressure inside and outside the battery pack is the same or differs little. At this time, the valve cover remains in the closed position blocking the exhaust hole; when thermal runaway occurs in the battery pack, the gas pressure inside the battery pack is much greater than the gas pressure outside the battery pack. Under the action of the gas pressure inside the battery pack, the valve cover rotates relative to the valve body so that the valve cover is in the open position opening the exhaust hole, and the gas inside the battery pack is discharged through the exhaust hole. By rotatably connecting the valve cover to the valve body, it is possible to avoid providing a guiding hole on the valve body, so that the aperture of the exhaust hole can be set larger, which is beneficial to the flow area of the explosion-proof valve and is beneficial to the rapid discharge of gas when thermal runaway occurs in the battery pack, improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is an exploded view of the explosion-proof valve according to an embodiment of the present disclosure.

[0033] Figure 2 is a schematic structural view of the explosion-proof valve according to an embodiment of the present disclosure in the closed position.

[0034] Figure 3 is a sectional view of the explosion-proof valve according to an embodiment of the present disclosure in the closed position.

[0035] Figure 4 is an enlarged view of the air vent of the explosion-proof valve according to an embodiment of the present disclosure.

[0036] Figure 5 is a first working state diagram of the explosion-proof valve according to an embodiment of the present disclosure in the closed position.

[0037] Figure 6 is a second working state diagram of the explosion-proof valve according to an embodiment of the present disclosure in the closed position.

[0038] Figure 7 is a schematic structural view of the explosion-proof valve according to an embodiment of the present disclosure in the intermediate position.

[0039] Figure 8 is a schematic structural view of the explosion-proof valve according to an embodiment of the present disclosure in the open position.

[0040] Figure 9 is a sectional view of the explosion-proof valve according to an embodiment of the present disclosure in the open position.

[0041] Figure 10 is Figure 9 an enlarged view of part A in

[0042] Reference Signs:

[0043] 100, Explosion-proof valve;

[0044] 1. Valve body; 11. Exhaust hole; 12. Installation groove; 13. Stopping part; 14. First connection part; 15. Vent hole; 16. Communication groove; 161. First groove section; 162. Second groove section; 163. Stopping platform; 17. Thinning part; 18. Thickening part; 181. Installation part; 191. First ring groove; 192. Second ring groove; 101. First ring body; 102. Second ring body; 103. Concave stop

[0045] 2. Valve cover; 21. Magnetically conductive part; 22. Second connection part; 23. Convex stop

[0046] 3. Magnetic part;

[0047] 4. Vent membrane;

[0048] 5. Compression ring;

[0049] 6. First sealing ring;

[0050] 7. Second sealing ring. Detailed implementation manners

[0051] The embodiments of the present disclosure will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present disclosure, and should not be construed as a limitation to the present disclosure.

[0052] As Figures 1 to 10 shown, the explosion-proof valve 100 of the embodiment of the present disclosure includes a valve body 1 and a valve cover 2. The valve cover 2 is rotatably connected to the valve body 1. The valve body 1 is provided with an exhaust hole 11. The valve cover 2 can be switched between a closed position for blocking the exhaust hole 11 and an open position for opening the exhaust hole 11.

[0053] The explosion-proof valve 100 of the embodiment of the present disclosure is installed on a battery pack for use. When the battery pack is operating normally, the pressure inside and outside the battery pack is the same or differs slightly. At this time, the valve cover 2 remains in the closed position for blocking the exhaust hole 11. When the battery pack undergoes thermal runaway, the gas pressure inside the battery pack is much greater than the gas pressure outside the battery pack. Under the action of the gas pressure inside the battery pack, the valve cover 2 rotates relative to the valve body 1 so that the valve cover 2 is in the open position for opening the exhaust hole 11, and the gas inside the battery pack is discharged through the exhaust hole 11. By rotatably connecting the valve cover 2 to the valve body 1, it is possible to avoid providing a guiding hole in the valve body 1, so that the aperture of the exhaust hole 11 can be set larger, which is beneficial to the flow area of the explosion-proof valve 100 and is beneficial to the rapid discharge of gas when the battery pack undergoes thermal runaway, improving the safety of the battery pack.

[0054] Optionally, the valve cover 2 is opened under a preset pressure, and the preset pressure is 3 MPa to 5 MPa.

[0055] That is to say, when the gas pressure in the battery pack reaches the preset pressure, the valve cover 2 can rotate relative to the valve body 1 to open the exhaust hole 11.

[0056] In some embodiments, as shown in the figure, the valve body 1 is annular, and the valve body 1 encloses the exhaust hole 11.

[0057] For example, as Figure 1 、 Figures 5 to 8 shown, the ring body is circular, and the exhaust hole 11 is a circular hole.

[0058] By setting the valve body 1 to be annular and the inner hole of the valve body 1 to be the exhaust hole 11, on the one hand, it is beneficial to simplify the structure of the valve body 1, facilitate the processing and manufacturing of the explosion-proof valve 100, and help reduce the manufacturing cost of the explosion-proof valve 100; on the other hand, it is beneficial to reduce the flow resistance of the exhaust hole 11 to the gas and facilitate the rapid outflow of the gas.

[0059] Optionally, at least one of the valve body 1 and the valve cover 2 is provided with a magnetic member 3 to generate a magnetic attraction force between the valve cover 2 and the valve body 1. Under the action of the magnetic attraction force between the valve cover 2 and the valve body 1, the valve cover 2 is switched from the open position to the closed position.

[0060] For example, one of the valve body 1 and the valve cover 2 is provided with the magnetic member 3, and the other of the valve body 1 and the valve cover 2 has a magnetic conductive part 21, and the magnetic member 3 and the magnetic conductive part 21 are magnetically attracted to each other to switch the valve cover 2 to the closed position; or, the valve body 1 is provided with a first magnetic member, and the valve cover 2 is provided with a second magnetic member, and the first magnetic member and the second magnetic member are magnetically attracted to each other to switch the valve cover 2 to the closed position.

[0061] Utilize the magnetic attraction force between the valve cover 2 and the valve body 1 to switch the valve cover 2 to the closed position. On the one hand, the magnetic member 3 is convenient to be installed and fixed on the valve body 1 and the valve cover 2, which is beneficial to improving the assembly efficiency of the explosion-proof valve 100; on the other hand, by designing the magnitude of the magnetic attraction force, the opening pressure of the valve cover 2 can be controlled, which is convenient to design the opening pressure of the explosion-proof valve 100 according to needs.

[0062] Preferably, the valve body 1 is provided with the magnetic member 3, and the valve cover 2 has a magnetic conductive part 21, and a magnetic attraction force is generated between the magnetic member 3 and the magnetic conductive part 21.

[0063] It can be understood that the valve cover 2 is a moving part that rotates relative to the valve body 1, and the lighter its weight, the easier it is to rotate under the action of gas pressure and magnetic attraction force. By arranging the magnetic member 3 on the valve body 1, it is beneficial to reduce the weight of the valve cover 2 and facilitate the rotation of the valve cover 2 under the action of gas pressure and magnetic attraction force.

[0064] Optionally, the valve cover 2 integrally forms the magnetic conductive part 21. That is to say, the valve cover 2 is integrally made of a magnetic conductive material. For example, the material of the valve cover 2 includes iron.

[0065] The valve cover 2 integrally forms a magnetic conduction part 21. On the one hand, it is beneficial to improve the structural strength of the valve cover 2, thereby improving the reliability of the explosion-proof valve 100; on the other hand, it is convenient for the processing and manufacturing of the valve cover 2 and is beneficial to reducing the manufacturing cost of the explosion-proof valve 100.

[0066] In some other embodiments, the valve cover 2 includes a magnetic conduction part 21 and a non-magnetic conduction part. The magnetic conduction part 21 is annular, and the magnetic conduction part 21 is arranged around the non-magnetic conduction part.

[0067] For example, the non-magnetic conduction part is not circular, the magnetic conduction part 21 is circular-ring-shaped, and the valve cover 2 is integrally circular. Among them, the material of the non-magnetic conduction part can be plastic, and the material of the magnetic conduction part 21 can include iron. The magnetic conduction part 21 and the non-magnetic conduction part are integrally injection-molded.

[0068] It can be understood that the cost of the magnetic conduction material is usually relatively high. By setting the magnetic conduction part 21 as annular, while facilitating the processing and manufacturing of the valve cover 2, it is beneficial to reducing the material cost of the valve cover 2.

[0069] Optionally, as Figure 1 shown, the number of the magnetic members 3 is multiple, and the multiple magnetic members 3 are arranged at intervals along the circumferential direction of the exhaust hole 11.

[0070] For example, the number of the magnetic members 3 is two, and the two magnetic members 3 are arranged at intervals along the circumferential direction of the exhaust hole 11.

[0071] By arranging the multiple magnetic members 3 at intervals along the circumferential direction of the exhaust hole 11, at the closed position, along the circumferential direction of the exhaust hole 11, multiple places of the valve body 1 can generate magnetic suction forces on the valve cover 2, thereby preventing the valve cover 2 from being deflected due to uneven magnetic suction forces received, resulting in air leakage problems of the explosion-proof valve 100, and being beneficial to improving the reliability of the explosion-proof valve 100.

[0072] Optionally, the multiple magnetic members 3 are arranged uniformly along the circumferential direction of the exhaust hole 11.

[0073] Optionally, as Figure 3 shown, at the closed position, the magnetic member 3 is arranged corresponding to at least a part of the magnetic conduction part 21. The magnetic member 3 being arranged corresponding to the magnetic conduction part 21 can be understood as: the magnetic member 3 is arranged in alignment with the magnetic conduction part 21, or rather, the magnetic member 3 is arranged facing the magnetic conduction part 21.

[0074] By arranging the magnetic member 3 corresponding to the magnetic conduction part 21, the magnetic suction force of the magnetic member 3 on the magnetic conduction part 21 is relatively large, so that when the volume of the magnetic member 3 is relatively small, the magnetic suction force requirement for the magnetic conduction part 21 can also be met. Thus, it is beneficial to further reducing the cost of the explosion-proof valve 100.

[0075] Optionally, in the closed position, the first magnetic member is arranged corresponding to the second magnetic member. The first magnetic member being arranged corresponding to the second magnetic member can be understood as: the first magnetic member is arranged aligned with the second magnetic member, or rather, the first magnetic member is arranged facing the second magnetic member.

[0076] By arranging the first magnetic member corresponding to the second magnetic member, the magnetic attraction force between the first magnetic member and the second magnetic member is relatively large. Thus, when the volumes of the first magnetic member and the second magnetic member are relatively small, the magnetic attraction force requirement can still be met. Thereby, it is beneficial to further reduce the cost of the explosion-proof valve 100.

[0077] Optionally, the magnetic member 3 is a permanent magnetic member.

[0078] The magnetic member 3 being set as a permanent magnetic member is beneficial to simplifying the structure of the magnetic member 3. This is not only beneficial to reducing the cost of the magnetic member 3, but also convenient for the installation and fixation of the magnetic member 3.

[0079] Of course, in some other embodiments, the magnetic member 3 can also be set as an electromagnetic member. For example, the magnetic member 3 is an electromagnet.

[0080] Optionally, both the first magnetic member and the second magnetic member are permanent magnetic members.

[0081] The first magnetic member and the second magnetic member being set as permanent magnetic members is beneficial to simplifying the structures of the first magnetic member and the second magnetic member. This is not only beneficial to reducing the costs of the first magnetic member and the second magnetic member, but also convenient for the installation and fixation of the first magnetic member and the second magnetic member.

[0082] Optionally, as Figure 3 、 Figures 7 to 10 shown, the valve body 1 is provided with a stop portion 13, and the stop portion 13 abuts against the valve cover 2 when the valve cover 2 is opened by a preset angle, and the preset angle is less than or equal to 90°.

[0083] It can be understood that when the opening angle of the valve cover 2 is relatively large, the magnetic attraction force between the magnetic member 3 and the magnetic conduction portion 21 is relatively small, and the magnetic attraction force between the first magnetic member and the second magnetic member is relatively small. At this time, it is difficult for the valve cover 2 to switch to the closed position under the action of the magnetic attraction force.

[0084] By providing the stop portion 13 on the valve body 1 and using the stop portion 13 to limit the opening angle of the valve cover 2, such that the opening angle of the valve cover 2 is not greater than 90°, it is ensured that after the gas pressure inside the battery pack decreases, the valve cover 2 can switch to the closed position under the action of the magnetic attraction force. Thereby, it is beneficial to improving the reliability of the explosion-proof valve 100.

[0085] Optionally, as Figure 3 shown, a stop protrusion is provided on one side of the valve body 1 close to the valve cover 2, and the stop protrusion forms the stop portion 13.

[0086] The structure of the stopper portion 13 is simple, which facilitates the machining and manufacturing of the valve body 1 and is conducive to further reducing the manufacturing cost of the explosion-proof valve 100.

[0087] Optionally, as Figure 1 shown, the valve body 1 is provided with a first connecting portion 14, the valve cover 2 is provided with a second connecting portion 22, the second connecting portion 22 is rotatably connected to the first connecting portion 14, and the stopper portion 13 is provided at the first connecting portion 14.

[0088] For example, the first connecting portion 14 is provided with a rotating shaft hole, the second connecting portion 22 is provided with a rotating shaft, the rotating shaft is inserted into the rotating shaft hole, and the stopper portion 13 is arranged at the rotating shaft hole.

[0089] By arranging the stopper portion 13 at the first connecting portion 14, when the second connecting portion 22 rotates relative to the first connecting portion 14 and the valve cover 2 is opened by a preset angle, the stopper portion 13 abuts against the vicinity of the second connecting portion 22 to limit the opening angle of the valve cover 2. Thus, it is beneficial to improve the structural compactness of the explosion-proof valve 100 and is conducive to the lightweight and miniaturized design of the explosion-proof valve 100.

[0090] In some embodiments, as Figure 1 、 Figure 3 、 Figure 9 and Figure 10 shown, the explosion-proof valve 100 further includes a first sealing ring 6. The first sealing ring 6 is arranged around the exhaust hole 11 and is arranged on one side of the valve body 1 close to the valve cover 2 and is connected to the valve body 1. In the closed position, the first sealing ring 6 is clamped between the valve body 1 and the valve cover 2. Among them, the first sealing ring 6 can be a rubber ring.

[0091] In the closed position, by clamping the first sealing ring 6 between the valve body 1 and the valve cover 2, the sealing performance between the valve cover 2 and the valve body 1 can be improved, avoiding air leakage problems at this part of the explosion-proof valve 100, and being conducive to improving the reliability of the explosion-proof valve 100.

[0092] Optionally, as Figure 1 、 Figure 3 and Figure 10 shown, one side of the valve body 1 close to the valve cover 2 is provided with a first annular groove 191. The first annular groove 191 is arranged around the exhaust hole 11, and the first sealing ring 6 is arranged in the first annular groove 191. Among them, the first sealing ring 6 and the first annular groove 191 can be in interference fit.

[0093] By arranging the first annular groove 191 on the valve body 1, it is convenient to install and fix the first sealing ring 6, which is conducive to improving the assembly convenience of the explosion-proof valve 100.

[0094] In some embodiments, as Figure 1 、 Figure 3 、 Figure 4 and Figure 9As shown, the explosion-proof valve 100 further includes a second sealing ring 7. The second sealing ring 7 is disposed around the exhaust hole 11 and is provided on the side of the valve body 1 away from the valve cover 2 and is connected to the valve body 1. Among them, the second sealing ring 7 can be a rubber ring.

[0095] By disposing the second sealing ring 7 on the side of the valve body 1 away from the valve cover 2, when the explosion-proof valve 100 is installed and used on the battery pack, the second sealing ring 7 can be clamped between the valve body 1 and the box body of the battery pack, improving the sealing performance between the explosion-proof valve 100 and the box body, avoiding air leakage problems at this place of the battery pack, and being beneficial to improving the reliability of the battery pack.

[0096] Optionally, as Figure 1 、 Figure 3 and Figure 4 shown, a second annular groove 192 is provided on the side of the valve body 1 away from the valve cover 2. The second annular groove 192 is disposed around the exhaust hole 11, and the second sealing ring 7 is disposed in the second annular groove 192. Among them, the second sealing ring 7 and the second annular groove 192 can be in interference fit.

[0097] By providing the second annular groove 192 on the valve body 1, it is convenient to install and fix the second sealing ring 7, which is beneficial to improving the assembly convenience of the explosion-proof valve 100.

[0098] Optionally, as Figure 3 and Figure 10 shown, one of the valve body 1 and the valve cover 2 is provided with a concave stop 103, and the other of the valve body 1 and the valve cover 2 is provided with a convex stop 23. In the closed position, the convex stop 23 cooperates with the concave stop 103.

[0099] For example, as Figure 3 and Figure 10 shown, the valve body 1 is provided with a concave stop 103, and the valve cover 2 is provided with a convex stop 23. In the closed position, the convex stop 23 is in sealing cooperation with the concave stop 103.

[0100] In the closed position, by sealingly mating the convex stop 23 with the concave stop 103, the sealing performance between the valve cover 2 and the valve body 1 can be improved, avoiding air leakage problems at this place of the explosion-proof valve 100, and being beneficial to improving the reliability of the explosion-proof valve 100.

[0101] Optionally, an annular groove is provided on the side of the valve body 1 close to the valve cover 2. The annular groove is disposed around the exhaust hole 11 and includes a groove bottom wall and a groove side wall. The groove bottom wall is perpendicular to the groove side wall, and a concave stop 103 is formed at the connection of the groove bottom wall and the groove side wall; the valve cover 2 includes a first surface, a second surface and an outer peripheral surface. The first surface and the second surface are oppositely disposed along the thickness direction of the valve cover 2, and the outer peripheral surface is perpendicular to the first surface. A convex stop 23 is formed at the connection of the first surface and the outer peripheral surface.

[0102] By designing the valve body 1 and the valve cover 2 as described above, it is beneficial to simplify the structures of the valve body 1 and the valve cover 2, further facilitate the processing and manufacturing of the explosion-proof valve 100, and reduce the manufacturing cost of the explosion-proof valve 100.

[0103] In the related art, in addition to releasing the gas inside the battery pack when the battery pack undergoes thermal runaway, the explosion-proof valve also needs to balance the internal and external pressure differences of the battery pack when the battery pack is operating normally but the pressure difference between the inside and outside of the battery pack changes. If the explosion-proof valve is frequently opened to balance the internal and external pressure differences, it is not only easy to cause the explosion-proof valve to fail, but also easy for external impurities to enter the inside of the battery pack. Therefore, the explosion-proof valve needs to have a breathable function.

[0104] In some embodiments, as Figure 3 、 Figure 4 、 Figure 6 and Figure 9 shown, the pore wall of the exhaust hole 11 is provided with a breathable hole 15, the breathable hole 15 communicates with the exhaust hole 11, and the breathable hole 15 penetrates through the outside of the valve body 1 along the radial direction of the exhaust hole 11.

[0105] When the battery pack is operating normally, as Figure 5 shown, when the gas pressure inside the battery pack is greater than the gas pressure outside the battery pack, the gas inside the battery pack can flow through the exhaust hole 11 to the breathable hole 15, and then flow out through the breathable membrane 4 at the breathable hole 15 to balance the internal and external pressure differences of the battery pack; as Figure 6 shown, when the gas pressure inside the battery pack is less than the gas pressure outside the battery pack, the gas outside the battery pack can enter the breathable hole 15 through the breathable membrane 4, and then flow into the battery pack through the exhaust hole 11 to balance the internal and external pressure differences of the battery pack.

[0106] By providing the breathable hole 15, the explosion-proof valve 100 not only has a breathable function, but also can prevent external impurities from entering the inside of the battery pack, which is beneficial to further improving the safety of the battery pack.

[0107] Optionally, the explosion-proof valve 100 further includes a breathable membrane 4, and the breathable membrane 4 is connected to the valve body 1 and seals the breathable hole 15.

[0108] By providing the breathable membrane 4, it is possible to prevent impurities and the like from entering the inside of the battery pack through the breathable hole 15, which is beneficial to further improving the safety of the battery pack.

[0109] Optionally, the breathable membrane 4 is a waterproof breathable membrane.

[0110] For example, the breathable membrane 4 is an E-PTFE membrane.

[0111] By setting the breathable membrane 4 as a waterproof breathable membrane, it is possible to prevent water from entering the battery pack through the breathable hole 15, and further improve the safety of the battery pack.

[0112] Optionally, asFigure 4 As shown, the breathable film 4 is provided on the side of the ventilation hole 15 close to the exhaust hole 11.

[0113] By arranging the breathable film 4 on the side of the ventilation hole 15 close to the exhaust hole 11, part of the impurities can be blocked outside the ventilation hole 15 by the hole wall of the ventilation hole 15, preventing the impurities from adhering to the breathable film 4 and blocking the breathable film 4. Thereby, the reliability of the explosion-proof valve 100 can be improved.

[0114] Optionally, the ventilation hole 15 is elongated, and the width of the ventilation hole 15 is 0.2 mm to 1.0 mm.

[0115] For example, as Figure 4 shown, the width of the ventilation hole 15 is K, and K is 0.2 mm to 1.0 mm.

[0116] It can be understood that the smaller the width of the ventilation hole 15, the less likely it is for external impurities to enter the ventilation hole 15. However, the flow-through area of the ventilation hole 15 is also smaller; on the contrary, the larger the width of the ventilation hole 15, the larger the flow-through area of the ventilation hole 15, but the more likely it is for external impurities to enter the ventilation hole 15.

[0117] By setting the width of the ventilation hole 15 to 0.2 mm to 1.0 mm, while ensuring that external impurities are less likely to enter the ventilation hole 15, the flow-through area of the ventilation hole 15 is relatively large, improving the reliability of the explosion-proof valve 100.

[0118] Optionally, as Figure 4 and Figure 6 shown, the number of ventilation holes 15 is multiple, and one breathable film 4 seals multiple ventilation holes 15.

[0119] For example, the number of ventilation holes 15 is two, and one breathable film 4 seals two ventilation holes 15.

[0120] By setting the ventilation holes 15 to be multiple, it is beneficial to increase the flow-through area of the ventilation holes 15 and facilitate quickly balancing the internal and external pressure differences of the battery pack. One breathable film 4 seals multiple ventilation holes 15, which is beneficial to simplifying the structure of the explosion-proof valve 100 and further reducing the manufacturing cost of the explosion-proof valve 100.

[0121] Optionally, as Figure 3 and Figure 4As shown, a communication groove 16 is provided on the pore wall of the exhaust hole 11. The communication groove 16 connects the exhaust hole 11 and the air-permeable hole 15, and the communication groove 16 penetrates through the inner side of the valve body 1 along the radial direction of the exhaust hole 11. The communication groove 16 includes a first groove section 161 and a second groove section 162. The first groove section 161 and the second groove section 162 are arranged along the radial direction of the exhaust hole 11, and the first groove section 161 is arranged closer to the air-permeable hole 15 than the second groove section 162. The width of the first groove section 161 is greater than the width of the second groove section 162, and a retaining platform 163 is formed at the end of the second groove section 162 facing the first groove section 161. The air-permeable membrane 4 is arranged in the first groove section 161 and abuts against the retaining platform 163.

[0122] The arrangement of the communication groove 16 facilitates the installation and fixation of the air-permeable membrane 4, which is beneficial to improving the assembly efficiency of the explosion-proof valve 100 and further reducing the manufacturing cost of the explosion-proof valve 100.

[0123] Optionally, as Figure 3 and Figure 4 shown, the explosion-proof valve 100 further includes a pressing ring 5. The pressing ring 5 is arranged in the first groove section 161. The pressing ring 5 is connected to the valve body 1, and the air-permeable membrane 4 is clamped between the retaining platform 163 and the pressing ring 5.

[0124] For example, the pressing ring 5 is welded or bonded to the valve body 1, and the air-permeable membrane 4 is clamped between the retaining platform 163 and the pressing ring 5.

[0125] The arrangement of the pressing ring 5 facilitates the installation and fixation of the air-permeable membrane 4, which is beneficial to improving the assembly efficiency of the explosion-proof valve 100 and further reducing the manufacturing cost of the explosion-proof valve 100.

[0126] Optionally, as Figure 3 、 Figure 4 、 Figure 9 and Figure 10 shown, the valve body 1 is provided with an installation groove 12. The magnetic member 3 is arranged in the installation groove 12, and the installation groove 12 communicates with the exhaust hole 11. Among them, the magnetic member 3 can be welded or bonded to the groove wall of the installation groove 12.

[0127] When installing and fixing the magnetic member 3, the magnetic member 3 is in the exhaust hole 11 and is inserted into the installation groove 12 through the notch of the installation groove 12.

[0128] The arrangement of the installation groove 12 facilitates the installation and fixation of the magnetic member 3, which is beneficial to improving the assembly efficiency of the explosion-proof valve 100 and further reducing the manufacturing cost of the explosion-proof valve 100. In addition, the magnetic member 3 is arranged in the installation groove 12, which is beneficial to improving the structural compactness of the explosion-proof valve 100 and facilitating the lightweight and miniaturized design of the explosion-proof valve 100.

[0129] Optionally, as Figure 4As shown, the installation groove 12 is arranged on one side of the first groove section 161 in the axial direction of the exhaust hole 11, and the installation groove 12 communicates with the first groove section 161.

[0130] When installing and fixing the magnetic part 3, the magnetic part 3 is in the exhaust hole 11, first enters the first groove section 161, and then is loaded into the installation groove 12 through the notch of the installation groove 12. Thus, the first groove section 161 is not only used for installing the breathable film 4, but also serves as a passage for the magnetic part 3 to pass through, which is beneficial to further improving the structural compactness of the explosion-proof valve 100 and facilitating the lightweight and miniaturization design of the explosion-proof valve 100.

[0131] Optionally, as Figure 3 shown, the installation groove 12 is arranged on the side of the first groove section 161 close to the valve cover 2 in the axial direction of the exhaust hole 11.

[0132] Thus, the magnetic part 3 is arranged closer to the valve cover 2, so that the magnetic attraction force of the magnetic part 3 on the magnetic conduction part 21 is larger. Therefore, when the volume of the magnetic part 3 is small, it can also meet the magnetic attraction force requirement for the magnetic conduction part 21, which is beneficial to further reducing the cost of the explosion-proof valve 100.

[0133] Optionally, as Figure 1 shown, the valve body 1 includes an integrally formed first ring body 101 and a second ring body 102. The first ring body 101 is arranged on one side of the second ring body 102 in the axial direction of the exhaust hole 11. The valve cover 2 is arranged on the side of the first ring body 101 away from the second ring body 102. The magnetic part 3 is arranged on the first ring body 101, and the breathable film 4 is arranged on the second ring body 102.

[0134] By setting the valve body 1 as the above structure, on the one hand, it is convenient to set the specific structures of the first ring body 101 and the second ring body 102 according to needs, so as to save materials and facilitate the design of the explosion-proof valve 100; on the other hand, the magnetic part 3 and the air vent 15 are arranged on two different ring bodies, and during the assembly of the explosion-proof valve 100, the interference between the magnetic part 3 and the breathable film 4 can be effectively avoided, which is beneficial to improving the assembly efficiency of the explosion-proof valve 100.

[0135] Optionally, as Figure 3 、 Figure 5 and Figure 6 shown, the second ring body 102 includes a thinning part 17 and a thickening part 18. The size of the thinning part 17 in the radial direction of the exhaust hole 11 is smaller than the size of the thickening part 18 in the radial direction of the exhaust hole 11. The air vent 15 is arranged on the thinning part 17, and the thickening part 18 is provided with an installation part 181 for fixing the explosion-proof valve 100.

[0136] By arranging the ventilation holes 15 in the thinning part 17, the depth of the ventilation holes 15 is relatively shallow, which facilitates the processing and manufacturing of the ventilation holes 15 and is beneficial to further reducing the manufacturing cost of the explosion-proof valve 100. The arrangement of the installation part 181 facilitates the connection and fixation between the explosion-proof valve 100 and the battery pack.

[0137] Optionally, the installation part 181 is an installation hole.

[0138] When connecting the explosion-proof valve 100 to the battery pack, the fastener passes through the installation hole and is connected to the box body of the battery pack. Among them, the fastener can be a bolt, a screw, etc.

[0139] The battery pack of the embodiment of the present disclosure includes a box body and an explosion-proof valve 100. The explosion-proof valve 100 is the explosion-proof valve 100 described in any of the above embodiments, and the explosion-proof valve 100 is connected to the box body.

[0140] For example, the box body is provided with an air outlet hole, the explosion-proof valve 100 is installed at the air outlet hole, and the exhaust hole 11 is arranged corresponding to the air outlet hole. When the battery pack has a thermal runaway, under the action of the gas pressure inside the battery pack, the valve cover 2 rotates relative to the valve body 1 so that the valve cover 2 is in the open position for opening the exhaust hole 11, and the gas inside the battery pack sequentially passes through the air outlet hole and the exhaust hole 11 and is discharged.

[0141] The battery pack of the embodiment of the present disclosure has advantages such as good safety.

[0142] Optionally, the upper part of the valve cover 2 is rotatably connected to the valve body 1 so that the valve cover 2 switches to the closed position under the action of gravity.

[0143] By rotatably connecting the upper part of the valve cover 2 to the valve body 1, the gravity of the valve cover 2 is used as the power to drive the valve cover 2 to switch to the closed position, so that the magnetic suction force between the valve cover 2 and the valve body 1 can be reduced, and further the size of the magnetic part 3 can be reduced. Thus, it is beneficial to the lightweight and miniaturized design of the explosion-proof valve 100.

[0144] When the battery pack of the embodiment of the present disclosure is working normally, the gas pressure inside the battery pack is less than the preset pressure, and the valve cover 2 is kept in the closed position under the action of gravity and magnetic suction force (as Figures 2 to 6 shown). At this time, when the external air pressure of the battery pack changes, such as altitude change / temperature change, there will be a pressure difference between the inside and outside of the battery pack. When the gas pressure inside the battery pack is greater than the gas pressure outside the battery pack, the explosion-proof valve 100 is in the first working state (as Figure 5 shown), and the gas inside the battery pack can flow out through the ventilation holes 15 to balance the pressure difference between the inside and outside of the battery pack; when the gas pressure inside the battery pack is less than the gas pressure outside the battery pack, the explosion-proof valve 100 is in the second working state (as Figure 6 shown), and the gas outside the battery pack can enter the battery pack through the ventilation membrane 4 to balance the pressure difference between the inside and outside of the battery pack.

[0145] When the battery pack in the embodiment of the present disclosure undergoes thermal runaway, a large amount of high-temperature gas will be rapidly generated, resulting in a rapid increase in the air pressure and temperature inside the pack. When the gas pressure inside the battery pack reaches the preset pressure, the valve cover 2 rotates relative to the valve body 1 under the action of the gas pressure, so that the valve cover 2 is in the open position (as Figures 8 to 10 shown). This allows the gas inside the battery pack to be discharged through the exhaust hole 11, so as to reduce the pressure inside the battery pack and inhibit the temperature rise, and avoid safety accidents such as spontaneous combustion and explosion of the battery pack. When the gas pressure inside the battery pack is less than the preset pressure, the valve cover 2 switches to the closed position under the action of gravity and magnetic attraction. Among them, during the process of the valve cover 2 switching from the closed position to the open position, the valve cover 2 has multiple intermediate positions. When the valve cover 2 is in the intermediate position, its opening angle is greater than zero and less than the preset angle (as Figure 7 shown).

[0146] The vehicle in the embodiment of the present disclosure includes the battery pack described in any one of the above embodiments.

[0147] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present disclosure.

Claims

1. An explosion-proof valve, characterized in that, Comprising: A valve body provided with an exhaust hole; A valve cover rotatably connected to the valve body so that the valve cover can be switched between a closed position blocking the exhaust hole and an open position opening the exhaust hole.

2. The explosion-proof valve according to claim 1, characterized in that, The valve body is annular.

3. The explosion-proof valve according to claim 2, characterized in that, At least one of the valve body and the valve cover is provided with a magnetic member to generate a magnetic suction force between the valve cover and the valve body.

4. The explosion-proof valve according to claim 3, characterized in that, The valve body is provided with the magnetic member, and the valve cover has a magnetic conductive portion, and a magnetic suction force is generated between the magnetic member and the magnetic conductive portion.

5. The explosion-proof valve according to claim 4, characterized in that, The entire valve cover forms the magnetic conductive portion, or the valve cover includes a magnetic conductive portion and a non-magnetic conductive portion, the magnetic conductive portion is annular, and the magnetic conductive portion surrounds the non-magnetic conductive portion; and / or The number of the magnetic members is multiple, and the multiple magnetic members are arranged at intervals along the circumference of the exhaust hole.

6. The explosion-proof valve according to claim 4, characterized in that, The valve body is provided with a mounting groove, the magnetic member is arranged in the mounting groove, and the notch of the mounting groove communicates with the exhaust hole.

7. The explosion-proof valve according to claim 4, characterized in that, In the closed position, the magnetic member is arranged corresponding to at least a part of the magnetic conductive portion.

8. The explosion-proof valve according to claim 3, characterized in that, The magnetic member is a permanent magnetic member.

9. The explosion-proof valve according to claim 1, characterized in that, The valve body is provided with a stop portion, and the stop portion abuts against the valve cover when the valve cover is opened by a preset angle, and the preset angle is less than or equal to 90°.

10. The explosion-proof valve according to claim 9, characterized in that, A stop projection is provided on one side of the valve body close to the valve cover, and the stop projection forms the stop portion; and / or The valve body is provided with a first connecting portion, the valve cover is provided with a second connecting portion, the second connecting portion is rotatably connected to the first connecting portion, and the stop portion is arranged at the first connecting portion.

11. The explosion-proof valve according to claim 1, characterized in that, The pore wall of the exhaust hole is provided with a vent hole, the vent hole communicates with the exhaust hole, and the vent hole penetrates through the outside of the valve body along the radial direction of the exhaust hole.

12. The explosion-proof valve according to claim 11, characterized in that, The explosion-proof valve further includes a vent membrane connected to the valve body and blocking the vent hole.

13. The explosion-proof valve according to claim 12, characterized in that, The vent membrane is arranged on the side of the vent hole close to the exhaust hole.

14. The explosion-proof valve according to claim 13, characterized in that, The number of the vent holes is multiple, and one vent membrane blocks the multiple vent holes; and / or The vent hole is strip-shaped, and the width of the vent hole is 0.2 mm to 1.0 mm.

15. The explosion-proof valve according to claim 12, characterized in that, The pore wall of the exhaust hole is provided with a communication groove, the communication groove communicates the exhaust hole and the vent hole, and the communication groove penetrates through the inside of the valve body along the radial direction of the exhaust hole; The communication groove includes a first groove section and a second groove section, the first groove section and the second groove section are arranged along the radial direction of the exhaust hole, and the first groove section is closer to the vent hole than the second groove section, the width of the first groove section is greater than the width of the second groove section, and an end of the second groove section facing the first groove section forms a stop platform, and the vent membrane is arranged in the first groove section and abuts against the stop platform.

16. The explosion-proof valve according to claim 15, characterized in that, The explosion-proof valve further includes a pressing ring arranged in the first groove section, the pressing ring is connected to the valve body, and the vent membrane is clamped between the stop platform and the pressing ring.

17. The explosion-proof valve according to claim 15, characterized in that, The valve body is provided with a magnetic member to generate a magnetic suction force between the valve cover and the valve body; The valve body is provided with a mounting groove, the magnetic member is arranged in the mounting groove, the mounting groove is arranged on one side of the first groove section in the axial direction of the exhaust hole, and the mounting groove communicates with the first groove section.

18. The explosion-proof valve according to claim 17, characterized in that The installation groove is arranged on one side of the first groove section close to the valve cover in the axial direction of the exhaust hole.

19. The explosion-proof valve according to claim 12, characterized in that The valve body is provided with a magnetic member to generate a magnetic attraction force between the valve cover and the valve body. The valve body is annular, and the valve body includes an integrally formed first ring body and a second ring body. The first ring body is arranged on one side of the second ring body in the axial direction of the exhaust hole, and the valve cover is arranged on the side of the first ring body away from the second ring body. The magnetic member is arranged on the first ring body, and the breathable film is arranged on the second ring body.

20. The explosion-proof valve according to claim 19, characterized in that The second ring body includes a thinning portion and a thickening portion. The size of the thinning portion in the radial direction of the exhaust hole is smaller than the size of the thickening portion in the radial direction of the exhaust hole. The ventilation hole is arranged in the thinning portion, and the thickening portion is provided with an installation portion for fixing the explosion-proof valve.

21. The explosion-proof valve according to any one of claims 1-19, characterized in that The explosion-proof valve further includes: A first sealing ring that surrounds the exhaust hole, the first sealing ring is arranged on the side of the valve body close to the valve cover and is connected to the valve body. In the closed position, the first sealing ring is clamped between the valve body and the valve cover; and / or A second sealing ring that surrounds the exhaust hole, the second sealing ring is arranged on the side of the valve body away from the valve cover and is connected to the valve body.

22. The explosion-proof valve according to any one of claims 1-19, characterized in that One of the valve body and the valve cover is provided with a concave stop, and the other of the valve body and the valve cover is provided with a convex stop. In the closed position, the convex stop is in sealing cooperation with the concave stop.

23. A battery pack, characterized in that Including: A box body; An explosion-proof valve, which is the explosion-proof valve according to any one of claims 1-22, and the explosion-proof valve is connected to the box body.

24. The battery pack according to claim 23, characterized in that The upper part of the valve cover is rotatably connected to the valve body so that the valve cover switches to the closed position under the action of gravity.

25. A vehicle, characterized in that Including the battery pack according to claim 23 or 24.

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