Explosion-proof valve assembly and battery pack

Abstract

The invention provides an anti-explosion valve assembly and a battery pack, and relates to the technical field of batteries. The anti-explosion valve assembly comprises an anti-explosion valve and a non-return mechanism, and the non-return mechanism is arranged on the side of the anti-explosion valve. The anti-explosion valve comprises a valve main body and a valve cover; the non-return mechanism comprises a non-return piece; when the battery pack is decompressed, the valve cover is opened relative to the valve main body, and at least part of the structure of the non-return piece is clamped between the valve cover and the valve main body. The anti-explosion valve can be effectively prevented from being closed, the pressure relief time is prolonged, the anti-explosion valve can fully exhaust gas, full pressure relief is achieved to the maximum extent, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an explosion-proof valve assembly and a battery pack. Background Art

[0002] Electric vehicles are emerging as a new energy vehicle. The energy density of the battery pack of new energy vehicles is directly related to the improvement of the vehicle's driving range. In order to improve the safety performance of the vehicle, the battery pack is generally equipped with an explosion-proof valve during production.

[0003] When the gas pressure inside the battery pack increases, the explosion-proof valve opens to allow the internal gas to be discharged. In the related art, as the pressure inside the battery pack decreases, the explosion-proof valve will automatically close. However, after opening, it is not enough to release the high pressure inside the battery pack in a short time. The pressure release is not sufficient, the residual pressure in the battery pack is still large, and the safety performance of the battery pack is low. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide an explosion-proof valve assembly and a battery pack, which can effectively prevent the closing of the explosion-proof valve, extend the pressure relief time, allow the explosion-proof valve to be fully vented, achieve full pressure relief to the greatest extent, and improve the safety performance of the battery pack.

[0005] In order to achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides an explosion-proof valve assembly, which is used for a battery pack. The explosion-proof valve assembly includes an explosion-proof valve and a non-return mechanism, and the non-return mechanism is arranged on the side of the explosion-proof valve; the explosion-proof valve includes a valve body and a valve cover, and the non-return mechanism includes a non-return member; when the battery pack is depressurized, the valve cover opens relative to the valve body, and at least a part of the structure of the non-return member is stuck between the valve cover and the valve body.

[0006] In a feasible implementation, the anti-return member is movably arranged at the side of the explosion-proof valve; the anti-return member has a pre-tightening force to make it rotate or move toward the explosion-proof valve.

[0007] In a feasible implementation, the anti-return mechanism further includes a first elastic member, the first elastic member abuts against the anti-return member, and the first elastic member is configured to apply a force to the anti-return member to rotate or move toward the explosion-proof valve.

[0008] In an achievable implementation, the explosion-proof valve is arranged at the pressure relief hole of the battery pack, a rotating shaft hole is arranged on the side of the pressure relief hole, a rotating sleeve is arranged at one end of the anti-return member, and the rotating sleeve is rotatably arranged in the rotating shaft hole;

[0009] The first elastic member is a torsion spring, which is inserted into the rotating sleeve. A limiting protrusion is provided on the side of the rotating shaft hole, and the first end of the torsion spring is clamped with the limiting protrusion, and the second end of the torsion spring is clamped with the bottom wall of the rotating sleeve.

[0010] In an achievable implementation, the bottom wall of the rotating sleeve is provided with a fixing groove extending along its circumference, and the second end of the torsion spring is clamped in the fixing groove; and / or,

[0011] The limiting protrusion has a limiting groove, the first end of the torsion spring is passed through the limiting groove, and at least a part of the first end of the torsion spring is blocked to a side of the limiting protrusion away from the rotating shaft hole.

[0012] In a feasible embodiment, the anti-return mechanism also includes a first connecting member, which is passed through the rotating sleeve and connected to the bottom of the rotating shaft hole; there is a gap between the outer wall of the first connecting member and the inner wall of the rotating sleeve; at least part of the top structure of the first connecting member is blocked above the rotating sleeve.

[0013] In a feasible embodiment, the anti-return member is a spring sheet, and the two ends of the spring sheet are respectively a fixed end and a free end, the fixed end is fixedly connected to the side of the explosion-proof valve, and the free end is elastically bent relative to the fixed end, so that when the valve cover is opened relative to the valve body, the free end is reset and inserted between the valve cover and the valve body.

[0014] In a feasible implementation, at least part of the structure of the non-return member extends along the outer edge of the explosion-proof valve, and the thickness of the non-return member facing the explosion-proof valve is smaller than the thickness of the non-return member facing away from the explosion-proof valve.

[0015] In an achievable embodiment, it further comprises a floating switch, which is movably arranged on the side of the explosion-proof valve along the opening and closing direction of the valve cover; the floating switch abuts against a side of the valve cover away from the valve body;

[0016] When the valve cover is closed relative to the valve body, the floating switch abuts against the check member;

[0017] When the valve cover is opened relative to the valve body, the valve cover pushes the floating switch to move, and the floating switch is separated from the non-return member, so that the non-return member is clamped between the valve cover and the valve body.

[0018] In a feasible embodiment, the floating switch has an abutment portion, which extends from the side of the explosion-proof valve to the upper surface of the valve cover and abuts against the valve cover; the floating switch has a limiting portion, and the anti-return member is provided with a limiting hole at one end of the floating switch, and the limiting portion is connected to or separated from the limiting hole as the floating switch moves.

[0019] In a feasible embodiment, it further includes a second elastic member and a second connecting member, wherein the second connecting member is arranged on the side of the explosion-proof valve, the second elastic member is sleeved on the second connecting member, one end of the second elastic member abuts against the floating switch, and the other end of the second elastic member abuts against the second connecting member; the second elastic member is configured to apply a force toward the valve cover to the floating switch.

[0020] In a feasible embodiment, the explosion-proof valve is arranged on the pressure relief hole of the battery pack, a guide groove is provided on the side of the pressure relief hole, the floating switch has a sliding portion, and the sliding portion is inserted in the guide groove; the cross-sectional shape of the sliding portion matches the cross-sectional shape of the guide groove; the guide groove has a plurality of limiting surfaces, and the plurality of limiting surfaces are sequentially connected and surrounded by the circumference of the sliding portion.

[0021] A second aspect of an embodiment of the present application provides a battery pack, comprising a shell, a battery cell and an explosion-proof valve assembly, wherein the battery cell is arranged inside the shell, a pressure relief hole is provided on a side of the shell, and the explosion-proof valve assembly is arranged in the pressure relief hole.

[0022] In a feasible implementation, it further comprises a protective cover, wherein the protective cover is arranged on the outside of the explosion-proof valve assembly and connected to the shell, and an exhaust port is arranged on the side wall of the protective cover.

[0023] In a feasible implementation, there are a plurality of pressure relief holes, and the plurality of pressure relief holes are distributed at different positions around the shell, and at least one of the pressure relief holes is provided with the explosion-proof valve assembly.

[0024] The embodiment of the present application provides an explosion-proof valve assembly and a battery pack, including an explosion-proof valve and a non-return mechanism. When the battery pack is depressurized, at least part of the structure of the non-return mechanism is clamped between the valve cover and the valve body. During the depressurization process of the present application, the non-return mechanism can effectively prevent the explosion-proof valve from closing, prolong the depressurization time, allow the explosion-proof valve to be fully vented, achieve full depressurization to the greatest extent, and improve the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0026] Figure 2A schematic diagram of the assembly structure of the die-cast beam and explosion-proof valve assembly provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 A schematic diagram of the partially enlarged structure of part I;

[0028] Figure 4 An exploded schematic diagram of the assembly of a die-cast beam and an explosion-proof valve assembly provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of an explosion-proof valve assembly provided in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of the structure of the explosion-proof valve and the non-return mechanism provided in the embodiment of the present application;

[0031] Figure 7 A schematic diagram of the structure of the anti-return mechanism and the floating switch provided in the embodiment of the present application;

[0032] Figure 8 A front structural schematic diagram of the anti-return mechanism provided in an embodiment of the present application;

[0033] Fig. 9 A schematic diagram of the back structure of the anti-return mechanism provided in an embodiment of the present application;

[0034] Fig.10 A schematic diagram of the structure of a floating switch provided in an embodiment of the present application;

[0035] Fig.11 A schematic diagram of a structure in which a pressure relief hole is provided on a die-cast beam provided in an embodiment of the present application;

[0036] Fig.12 A schematic diagram of the structure of the pressure relief hole provided in the embodiment of the present application;

[0037] Fig.13 A schematic diagram of the structure of the shaft hole and the limiting protrusion provided in the embodiment of the present application;

[0038] Fig.14 A schematic diagram of the structure of the guide groove provided in the embodiment of the present application;

[0039] Fig.15 This is an assembly cross-sectional view of the rotating sleeve and the rotating shaft hole provided in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100-explosion-proof valve assembly;

[0042] 110-explosion-proof valve; 111-valve body; 112-valve cover;

[0043] 120-anti-return mechanism; 121-anti-return member; 1211-limiting hole;

[0044] 122-first elastic member; 123-rotating sleeve; 124-fixing groove;

[0045] 125-first connecting member; 130-floating switch; 131-abutting portion;

[0046] 132-limiting portion; 133-sliding portion; 140-second elastic member;

[0047] 150-second connecting piece; 160-protective cover; 170-fastening screw;

[0048] 200-battery pack;

[0049] 210-housing; 211-pressure relief hole; 220-shaft hole;

[0050] 230-limiting protrusion; 231-limiting groove; 240-guide groove;

[0051] 241-limiting surface; 250-die-casting beam. DETAILED DESCRIPTION

[0052] When the gas pressure inside the battery pack increases, the explosion-proof valve opens to allow the internal gas to be discharged. In the related art, as the pressure inside the battery pack decreases, if the pressure relief process is less than or equal to the explosion-proof valve opening pressure, the explosion-proof valve will automatically rebound due to the spring structure and close the pressure relief. However, after opening, it is not enough to release the high pressure inside the battery pack in a short time. The pressure relief is not sufficient, the residual pressure in the battery pack is still large, the safety performance of the battery pack is low, and it is easy to cause safety accidents.

[0053] In view of the above technical problems, the embodiments of the present application provide an explosion-proof valve assembly and a battery pack, including an explosion-proof valve and a non-return mechanism. When the battery pack is depressurized, at least part of the structure of the non-return mechanism is clamped between the valve cover and the valve body. When the pressure is released, the non-return mechanism can effectively prevent the explosion-proof valve from closing, prolong the pressure release time, and allow the explosion-proof valve to be fully vented, thereby achieving full pressure release to the greatest extent and improving the safety performance of the battery pack.

[0054] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0055] Reference Figures 1 to 3 As shown, the embodiment of the present application provides a battery pack 200, including a housing 210 and a battery cell, the battery cell is arranged inside the housing 210, and a pressure relief hole 211 (see Fig.11 and Fig.12 Specifically, the housing 210 includes a die-cast beam 250 , and the pressure relief hole 211 is disposed on the die-cast beam 250 .

[0056] It is understandable that the battery pack 200 will generate heat during operation, causing the internal air pressure to increase. If there is no pressure relief hole 211, the internal air pressure may be too high, affecting the normal operation of the battery pack 200. The pressure relief hole 211 can release the internal gas in time to maintain the balance of internal and external air pressures and prevent the battery pack 200 from being damaged due to excessive air pressure.

[0057] When the gas pressure inside the battery pack 200 increases, in order to ensure that the internal gas is discharged to the outside, the safety performance of the battery pack 200 is ensured. Figures 4 to 6 As shown, the battery pack 200 also includes an explosion-proof valve assembly 100, which is arranged on the pressure relief hole 211. In this way, when the internal pressure of the battery pack 200 reaches a set value, the explosion-proof valve assembly 100 opens from the pressure relief hole 211 to start pressure relief, and when the pressure drops below the set value, the explosion-proof valve assembly 100 is restored to the original sealing state. The explosion-proof valve assembly 100 can be arranged on the pressure relief hole 211 by fastening screws 170.

[0058] In the embodiment of the present application, the number of the pressure relief holes 211 is not limited. For example, the number of the pressure relief holes 211 can be multiple, and the multiple pressure relief holes 211 can be distributed at different positions of the housing 210, and at least one pressure relief hole 211 can be provided with an explosion-proof valve assembly 100. For example, one of the pressure relief holes 211 can use the explosion-proof valve assembly 100 of the present application, and the remaining pressure relief holes 211 can use ordinary explosion-proof valves 110. This embodiment does not limit this, and it can be specifically set according to actual needs.

[0059] In order to improve the sealing performance of the explosion-proof valve assembly 100, in the embodiment of the present application, referring to Figure 4 As shown, the battery pack 200 may further include a protective cover 160 , which is disposed on the outside of the explosion-proof valve assembly 100 and connected to the housing 210 , and a side wall of the protective cover 160 is provided with an exhaust port.

[0060] It can be understood that the protection cover 160 is disposed on the outer side of the explosion-proof valve assembly 100 means that the protection cover 160 is located on a side of the explosion-proof valve assembly 100 away from the battery cell.

[0061] In this embodiment, the material of the protective cover 160 is not limited. For example, the protective cover 160 can be made of cloud steel, which effectively improves the safety of the explosion-proof valve assembly 100, effectively avoids the impact of the explosion-proof valve assembly 100, and the impact of external foreign objects on the explosion-proof valve assembly 100. At the same time, an exhaust port is opened on the protective cover 160. When the battery pack 200 is thermally runaway, the exhaust can be discharged through the exhaust port to improve the safety performance. Among them, the opening position of the exhaust port can be set according to the specific exhaust direction, which is not limited in this embodiment.

[0062] In addition, the shape of the protective cover 160 is not limited. Exemplarily, the protective cover 160 may be in a cloud shape, wherein the cloud-shaped protective cover 160 may effectively protect the explosion-proof valve assembly 100 from external damage, such as dust, pollution, corrosion or impact, etc.; in addition, the cloud-shaped protective cover 160 has good sealing and bearing capacity, further improving the protection effect of the explosion-proof valve assembly 100; secondly, the cloud-shaped protective cover 160 has a smooth and flat surface, which may improve the appearance quality and overall aesthetics of the device. This embodiment does not limit this.

[0063] In the process of pressure relief of the battery pack 200, when the pressure relief process is less than or equal to the valve opening pressure of the explosion-proof valve 110, it is easy to cause the explosion-proof valve 110 to automatically return to the closed state before the pressure relief is completed, which is easy to cause incomplete pressure relief. Therefore, in order to fully relieve pressure and improve the safety performance of the battery pack 200, an explosion-proof valve assembly 100 is provided in the embodiment of the present application.

[0064] Reference Figure 5 and Figure 6 As shown, the explosion-proof valve assembly 100 may include an explosion-proof valve 110 and a non-return mechanism 120, the explosion-proof valve 110 includes a valve body 111 and a valve cover 112, and the non-return mechanism 120 includes a non-return member 121; when the battery pack 200 is depressurized, the valve cover 112 opens relative to the valve body 111, and at least part of the structure of the non-return member 121 is stuck between the valve cover 112 and the valve body 111.

[0065] In the embodiment of the present application, the location of the non-return mechanism 120 is not limited. For example, in the present embodiment, the non-return mechanism 120 is mainly arranged on the side of the explosion-proof valve 110. In this way, the non-return mechanism 120 will not interfere with the opening or closing of the valve cover 112 relative to the valve body 111, and will not affect the assembly of the explosion-proof valve 110.

[0066] In the embodiment of the present application, the shape of the anti-reversal member 121 is not limited. Figures 7 to 9 As shown, the anti-return member 121 can be a rotating scimitar anti-return structure. With this design, on the one hand, the scimitar is in a curved shape, which can be better clamped between the valve cover 112 and the valve body 111 to reduce the clamping resistance; in addition, this design can adapt to explosion-proof valves 110 of different shapes and sizes.

[0067] The non-return function of the non-return mechanism 120 in the embodiment of the present application is as follows: when the explosion-proof valve 110 is subjected to an internal pressure of the battery pack 200 greater than 3 kPa, the valve cover 112 of the explosion-proof valve 110 is opened relative to the valve body 111. At this time, the non-return member 121 is in an open state, and the non-return member 121 is clamped between the valve cover 112 and the valve body 111, thereby clamping the explosion-proof valve 110 and preventing the explosion-proof valve 110 from forming a closed state when the internal air pressure of the battery pack 200 is less than 3 kPa.

[0068] Therefore, in the explosion-proof valve assembly 100 provided in the embodiment of the present application, during the pressure relief process, the non-return mechanism 120 can effectively prevent the explosion-proof valve 110 from closing, thereby prolonging the pressure relief time. The explosion-proof valve 110 can be fully vented, and the residual air pressure after heat diffusion in the package can be reduced as much as possible, thereby reducing the risk of heat diffusion, so that when the pressure relief is lower than the valve closing threshold, the valve can still be kept open to achieve complete pressure relief, thereby improving the safety performance of the battery pack 200.

[0069] In a feasible implementation, the non-return member 121 is movably disposed on the side of the explosion-proof valve 110 ; the non-return member 121 has a pre-tightening force that enables it to rotate or move toward the explosion-proof valve 110 .

[0070] In the embodiment of the present application, the method for providing the preload force is not limited. For example, the preload force can be provided by an elastic member such as a spring, or can also be provided by itself, for example, the anti-return member 121 itself is a spring structure. This embodiment does not limit this.

[0071] It is understandable that the check member 121 is limited to a movable setting, so that the movement of the check member 121 can be achieved, which is conducive to the check member 121 being clamped between the valve cover 112 and the valve body 111. The movable mode of the check member 121 is not limited. Exemplarily, the check member 121 can be moved between the valve cover 112 and the valve body 111 by rotation; or, the check member 121 can be moved between the valve cover 112 and the valve body 111 by translation. This embodiment does not limit this.

[0072] In order to realize the movement of the anti-return member 121, in an achievable embodiment, refer to Figure 8 and Fig. 9 As shown, the anti-return mechanism 120 may include a first elastic member 122 , the first elastic member 122 abuts against the anti-return member 121 , and the first elastic member 122 is configured to apply a force to the anti-return member 121 to rotate or move toward the explosion-proof valve 110 .

[0073] In the embodiment of the present application, the structure of the first elastic member 122 is not limited. For example, the first elastic member 122 may be a spring, which may apply a linear motion force to the anti-return member 121; or the first elastic member 122 may be a torsion spring, which may apply a rotational force to the anti-return member 121. This embodiment does not limit this. In addition, the abutment method of the first elastic member 122 and the anti-return member 121 is also not limited.

[0074] In one possible implementation, referring to Figures 11 to 13 As shown, the explosion-proof valve 110 is disposed at the pressure relief hole 211 of the battery pack 200. In the embodiment of the present application, a rotating shaft hole 220 may be disposed on the side of the pressure relief hole 211, and a rotating sleeve 123 may be disposed at one end of the anti-return member 121, and the rotating sleeve 123 may be rotatably disposed in the rotating shaft hole 220. The first elastic member 122 is a torsion spring, and the torsion spring is passed through the rotating sleeve 123.

[0075] In this way, the rotating sleeve 123 is rotatably arranged in the shaft hole 220, and the rotating sleeve 123 can effectively withstand axial and radial forces, thereby transmitting power to the anti-return member 121. In addition, the rotating sleeve 123 can also serve as an axial support to provide stable installation and support for the first elastic member 122, thereby ensuring that the first elastic member 122 applies a force to the anti-return member 121 to rotate or move toward the explosion-proof valve 110.

[0076] In order to fix the anti-rotation sleeve 123, in the embodiment of the present application, refer to Figure 12 to Figure 14As shown, a limiting protrusion 230 may be provided on the side of the rotating shaft hole 220, the first end of the torsion spring is engaged with the limiting protrusion 230, and the second end of the torsion spring is engaged with the bottom wall of the rotating sleeve 123. In this way, it is helpful to fix the rotating sleeve 123, and the limiting structure does not contact the anti-return member 121, so that the anti-return member 121 can be flexibly rotated, and then rotated to between the valve cover 112 and the valve body 111 when the valve cover 112 is opened.

[0077] In one possible implementation, when the rotating sleeve 123 is fixed, the reference Fig. 9 As shown, the bottom wall of the rotating sleeve 123 may be provided with a fixing groove 124 extending along its circumference, and the second end of the torsion spring is clamped in the fixing groove 124. Fig.13 As shown, the limiting protrusion 230 may have a limiting groove 231, the first end of the torsion spring is inserted into the limiting groove 231, and at least a part of the first end of the torsion spring is blocked to the side of the limiting protrusion 230 away from the rotating shaft hole 220. This embodiment is not limited to this.

[0078] This helps to improve the fixing effect of the rotating sleeve 123. In addition, at least a portion of the structure of the first end of the torsion spring is blocked to the side of the limiting protrusion 230 away from the shaft hole 220. This helps to prevent the torsion spring from escaping from the limiting sleeve, thereby ensuring the fixing stability of the torsion spring and the rotating sleeve 123 to the greatest extent.

[0079] In one possible implementation, referring to Figure 7 and Fig.15 As shown, the anti-return mechanism 120 can also include a first connecting member 125, which is passed through the rotating sleeve 123 and connected to the bottom of the rotating shaft hole 220; there is a gap between the outer wall of the first connecting member 125 and the inner wall of the rotating sleeve 123; at least part of the top structure of the first connecting member 125 is blocked above the rotating sleeve 123.

[0080] In the embodiment of the present application, there is no limitation on the type of the first connecting member 125. For example, the first connecting member 125 may be a screw, wherein at least a portion of the top of the first connecting member 125 is a nut of the screw. In this way, the nut is disposed above the rotating sleeve 123, which can further fix and seal the first end of the torsion spring, thereby ensuring that the anti-return member 121 can flexibly rotate.

[0081] In the embodiment of the present application, a gap is defined between the outer wall of the first connecting member 125 and the inner wall of the rotating sleeve 123 , which helps to avoid the first connecting member 125 and the rotating sleeve 123 from getting stuck, thereby facilitating the rotation of the rotating sleeve 123 .

[0082] There is no limitation on the specific value of the gap, and it can be set according to actual needs.

[0083] In a feasible embodiment, the anti-return member 121 can be a spring sheet, the two ends of which are a fixed end and a free end, respectively, wherein the fixed end can be fixedly connected to the side of the explosion-proof valve 110, and the free end can be elastically bent relative to the fixed end, so that when the valve cover 112 is opened relative to the valve body 111, the free end is inserted between the valve cover 112 and the valve body 111.

[0084] Thus, compared with the torsion spring, the structure of the spring sheet is relatively simple, so that the installation process is relatively simple, easy to operate and maintain; in addition, the manufacturing cost of the spring sheet is relatively low. This embodiment does not limit this.

[0085] It should be noted that when a spring sheet structure is used, the fixed end of the spring sheet can be fixedly installed on the side of the explosion-proof valve 110 by screws or other means.

[0086] In a feasible implementation, at least a portion of the structure of the check member 121 may extend along the outer edge of the explosion-proof valve 110 .

[0087] In the embodiment of the present application, the check member 121 is a scimitar structure, and the length of the check member 121 is relatively long. In this way, when the explosion-proof valve 110 is opened, the check member 121 rotates and cuts into the explosion-proof valve 110 under the support of the spring torsional force, which helps to increase the cutting area between the check member 121 and the explosion-proof valve 110, thereby helping to ensure that the explosion-proof valve 110 can still be kept open when the exhaust reaches the final stage, effectively preventing the explosion-proof valve 110 from closing, so that the explosion-proof valve 110 can be fully exhausted and complete pressure relief is achieved.

[0088] In the embodiment of the present application, the thickness of the side of the check piece 121 facing the explosion-proof valve 110 is less than the thickness of the side of the check piece 121 facing away from the explosion-proof valve 110. In this way, the check piece 121 on the thinner side is rotated to cut into the explosion-proof valve 110. This design can reduce the force required for cutting, so that the thinner side can cut into the explosion-proof valve 110 more easily, while the thicker side can provide better strength and durability.

[0089] In one possible implementation, referring to Fig.10 As shown, a floating switch 130 may also be included. The floating switch 130 is movably disposed on the side of the explosion-proof valve 110 along the opening and closing direction of the valve cover 112 ; the floating switch 130 abuts against a side of the valve cover 112 away from the valve body 111 .

[0090] When the valve cover 112 is closed relative to the valve body 111, the floating switch 130 abuts against the check member 121; when the valve cover 112 is opened relative to the valve body 111, the valve cover 112 pushes the floating switch 130 to move, and the floating switch 130 is separated from the check member 121, so that the check member 121 is stuck between the valve cover 112 and the valve body 111.

[0091] In the embodiment of the present application, the floating switch 130 has four faces connected in sequence, all of which are vertical designs, forming a limit design in four directions (up, down, left and right), so that the entire floating switch 130 can only float forward and backward, thereby making it consistent with the opening and closing direction of the explosion-proof valve 110.

[0092] In one possible implementation, referring to Fig.10 As shown, the floating switch 130 has an abutment portion 131, which extends from the side of the explosion-proof valve 110 to the upper surface of the valve cover 112 and abuts against the valve cover 112; the floating switch 130 has a limiting portion 132, and a limiting hole 1211 is provided at one end of the anti-return member 121 facing the floating switch 130, and the limiting portion 132 is plugged into or separated from the limiting hole 1211 as the floating switch 130 moves.

[0093] In the embodiment of the present application, the shape of the abutment portion 131 is not limited. For example, the abutment portion 131 in the present embodiment can be a large circular surface structure. The limiting portion 132 can be a limiting column, which is used to fix one end of the anti-reversal member 121.

[0094] The movement process of the floating switch 130 of the present embodiment is as follows: when the battery pack 200 is operating normally, the abutting portion 131 is pressed against the valve body 111; when the explosion-proof valve 110 is subjected to an internal pressure of the battery pack 200 greater than 3 kPa, the explosion-proof valve 110 is opened, and after opening, the floating switch 130 is lifted up; during the upward movement of the floating switch 130, the limiting portion 132 is separated from the limiting hole 1211, thereby disengaging the floating switch 130 from the anti-return member 121; after disengagement, the anti-return member 121 is in an open state.

[0095] In one possible implementation, referring to Fig.10 As shown, it can also include a second elastic member 140 and a second connecting member 150. The second connecting member 150 is arranged on the side of the explosion-proof valve 110, and the second elastic member 140 is sleeved on the second connecting member 150. One end of the second elastic member 140 abuts against the floating switch 130, and the other end of the second elastic member 140 abuts against the second connecting member 150; the second elastic member 140 is configured to apply a force toward the valve cover 112 to the floating switch 130.

[0096] In the embodiment of the present application, the structure of the second elastic member 140 is not limited. For example, the second elastic member 140 can be a spring. The first elastic member 122 provides a small pre-tightening force to the floating switch 130, which helps to press the floating switch 130. In the embodiment of the present application, the structure of the second connecting member 150 is not limited. For example, the second connecting member 150 is a stud.

[0097] In an achievable implementation, the explosion-proof valve 110 is disposed at the pressure relief hole 211 of the battery pack 200, wherein Fig.12 and Fig.14 As shown, a guide groove 240 may be provided on the side of the pressure relief hole 211, and the floating switch 130 may have a sliding portion 133, which is inserted into the guide groove 240; the cross-sectional shape of the sliding portion 133 matches the cross-sectional shape of the guide groove 240; the guide groove 240 has a plurality of limiting surfaces 241, which are sequentially connected and surrounded by the sliding portion 133.

[0098] In the embodiment of the present application, the number of the limiting surfaces 241 is not limited and can be set according to actual needs. In this way, the limiting surfaces 241 cooperate with the sliding portion 133 to play a certain limiting role on the floating switch 130, reduce the floating switch 130 from floating to the sides, and thus ensure the floating switch 130 to float up and down.

[0099] A guide hole is formed at the bottom of the guide groove 240 , and the second connecting member 150 of the floating switch 130 is assembled in the guide hole.

[0100] The embodiment of the present application provides an explosion-proof valve assembly and a battery pack, including an explosion-proof valve and a non-return mechanism. When the battery pack is depressurized, at least part of the non-return mechanism is clamped between the valve cover and the valve body. When the pressure is released, the non-return mechanism can effectively prevent the explosion-proof valve from closing, prolong the pressure release time, and allow the explosion-proof valve to be fully vented, thereby achieving full pressure release to the greatest extent and improving the safety performance of the battery pack.

[0101] It should be noted that, in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0102] In the description of the embodiments of the present application, the term "and / or" merely indicates an association relationship that describes associated objects, indicating that three relationships may exist. For example, A and / or B may indicate the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" indicates any combination of at least two of any one or more of a plurality of. For example, at least one of A, B, and C may indicate any one or more elements selected from a set that includes A, B, and C.

[0103] In the description of the embodiments of the present application, the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the term "plurality" means two or more, unless otherwise precisely and specifically specified.

[0104] In the description of the embodiment of the present application, the terms "first", "second", "third", "fourth", etc. (if present) are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof valve assembly, characterized in that: Used in a battery pack, the explosion-proof valve assembly comprises an explosion-proof valve (110) and a non-return mechanism (120), wherein the non-return mechanism (120) is arranged on the side of the explosion-proof valve (110); the explosion-proof valve (110) comprises a valve body (111) and a valve cover (112), and the non-return mechanism (120) comprises a non-return member (121); when the battery pack is depressurized, the valve cover (112) opens relative to the valve body (111), and at least a portion of the structure of the non-return member (121) is clamped between the valve cover (112) and the valve body (111).

2. The explosion-proof valve assembly according to claim 1, characterized in that: The non-return member (121) is movably arranged on the side of the explosion-proof valve (110); the non-return member (121) has a pre-tightening force that causes it to rotate or move toward the explosion-proof valve (110).

3. The explosion-proof valve assembly according to claim 1, characterized in that: The anti-return mechanism (120) further comprises a first elastic member (122), the first elastic member (122) being in contact with the anti-return member (121), and the first elastic member (122) being configured to apply a force to the anti-return member (121) to rotate or move toward the explosion-proof valve (110).

4. The explosion-proof valve assembly according to claim 3, characterized in that: The explosion-proof valve (110) is arranged at the pressure relief hole (211) of the battery pack, a rotating shaft hole (220) is arranged on the side of the pressure relief hole (211), a rotating sleeve (123) is arranged at one end of the anti-return member (121), and the rotating sleeve (123) is rotatably arranged in the rotating shaft hole (220); The first elastic member (122) is a torsion spring, which is inserted into the rotating sleeve (123); a limiting protrusion (230) is provided on the side of the rotating shaft hole (220), the first end of the torsion spring is clamped with the limiting protrusion (230), and the second end of the torsion spring is clamped with the bottom wall of the rotating sleeve (123).

5. The explosion-proof valve assembly according to claim 4, characterized in that: The bottom wall of the rotating sleeve (123) is provided with a fixing groove (124) extending along its circumference, and the second end of the torsion spring is clamped in the fixing groove (124); and / or, The limiting protrusion (230) has a limiting groove (231), the first end of the torsion spring is inserted into the limiting groove (231), and at least a part of the first end of the torsion spring is blocked to a side of the limiting protrusion (230) away from the rotating shaft hole (220).

6. The explosion-proof valve assembly according to claim 4, characterized in that: The anti-return mechanism (120) further comprises a first connecting member (125), wherein the first connecting member (125) is inserted through the rotating sleeve (123) and connected to the bottom of the rotating shaft hole (220); a gap is formed between the outer wall of the first connecting member (125) and the inner wall of the rotating sleeve (123); and at least a part of the top structure of the first connecting member (125) is blocked above the rotating sleeve (123).

7. The explosion-proof valve assembly according to claim 1, characterized in that: The anti-return component (121) is a spring sheet, and the two ends of the spring sheet are respectively a fixed end and a free end, the fixed end is fixedly connected to the side of the explosion-proof valve (110), and the free end is elastically bent relative to the fixed end, so that when the valve cover (112) is opened relative to the valve body (111), the free end is inserted between the valve cover (112) and the valve body (111).

8. The explosion-proof valve assembly according to any one of claims 1 to 7, characterized in that: At least a portion of the structure of the non-return member (121) extends along the outer edge of the explosion-proof valve (110), and the thickness of the non-return member (121) facing the explosion-proof valve (110) is smaller than the thickness of the non-return member (121) facing away from the explosion-proof valve (110).

9. The explosion-proof valve assembly according to any one of claims 1 to 7, characterized in that: It also includes a floating switch (130), which is movably arranged on the side of the explosion-proof valve (110) along the opening and closing direction of the valve cover (112); the floating switch (130) is in contact with a side of the valve cover (112) that is away from the valve body (111); When the valve cover (112) is closed relative to the valve body (111), the floating switch (130) abuts against the check member (121); When the valve cover (112) is opened relative to the valve body (111), the valve cover (112) pushes the floating switch (130) to move, and the floating switch (130) is separated from the non-return member (121), so that the non-return member (121) is clamped between the valve cover (112) and the valve body (111).

10. The explosion-proof valve assembly according to claim 9, characterized in that: The floating switch (130) has an abutting portion (131), which extends from the side of the explosion-proof valve (110) to the upper surface of the valve cover (112) and abuts against the valve cover (112); the floating switch (130) has a limiting portion (132), and a limiting hole (1211) is provided at one end of the non-return member (121) facing the floating switch (130), and the limiting portion (132) is plugged into or separated from the limiting hole (1211) as the floating switch (130) moves.

11. The explosion-proof valve assembly according to claim 9, characterized in that: The invention also comprises a second elastic member (140) and a second connecting member (150), wherein the second connecting member (150) is arranged on the side of the explosion-proof valve (110), the second elastic member (140) is sleeved on the second connecting member (150), one end of the second elastic member (140) abuts against the floating switch (130), and the other end of the second elastic member (140) abuts against the second connecting member (150); the second elastic member (140) is configured to apply a force to the floating switch (130) toward the valve cover (112).

12. The explosion-proof valve assembly according to claim 9, characterized in that: The explosion-proof valve (110) is arranged on the pressure relief hole (211) of the battery pack, and a guide groove (240) is arranged on the side of the pressure relief hole (211). The floating switch (130) has a sliding part (133), and the sliding part (133) is inserted into the guide groove (240); the cross-sectional shape of the sliding part (133) matches the cross-sectional shape of the guide groove (240); the guide groove (240) has a plurality of limiting surfaces (241), and the plurality of limiting surfaces (241) are sequentially connected and arranged around the sliding part (133).

13. The explosion-proof valve assembly according to any one of claims 1 to 7, characterized in that: The explosion-proof valve assembly further comprises a protective cover (160), wherein the protective cover (160) is arranged on the outside of the explosion-proof valve (110), and an exhaust port is arranged on the side wall of the protective cover (160).

14. A battery pack, characterized in that: It comprises a shell, a battery cell and an explosion-proof valve assembly as claimed in any one of claims 1 to 13, wherein the battery cell is arranged inside the shell, the shell is provided with a pressure relief hole (211), the explosion-proof valve assembly is arranged in the pressure relief hole (211), and the protective cover (160) of the explosion-proof valve assembly is connected to the shell.

15. The battery pack according to claim 14, characterized in that: There are a plurality of pressure relief holes (211), and the plurality of pressure relief holes (211) are distributed at different positions of the housing, and at least one of the pressure relief holes (211) is provided with the explosion-proof valve assembly.

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