Explosion-proof valve assembly and battery pack

Abstract

This application provides an explosion-proof valve assembly and a battery pack, relating to the field of battery technology. The explosion-proof valve assembly includes an explosion-proof valve and a check mechanism, the check mechanism being disposed on the side of the explosion-proof valve. The explosion-proof valve includes a valve body and a valve cover, and the check mechanism includes a check element. When the battery pack is depressurized, the valve cover opens relative to the valve body, and at least a portion of the check element is engaged between the valve cover and the valve body. This application can effectively prevent the explosion-proof valve from closing, prolong the depressurization time, allow the explosion-proof valve to fully vent air, maximize depressurization, and improve the safety performance of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an explosion-proof valve assembly and a battery pack. Background Technology

[0002] Electric vehicles are emerging as a type of new energy vehicle, and the energy density of their battery packs directly affects the vehicle's driving range. To improve overall vehicle safety, battery packs are typically equipped with explosion-proof valves during production.

[0003] When the gas pressure inside the battery pack increases, the explosion-proof valve opens, allowing the internal gas to escape. In related technologies, the explosion-proof valve automatically closes as the internal pressure of the battery pack decreases. However, this is insufficient to release the high pressure inside the battery pack in a short time, resulting in inadequate pressure relief and a relatively high residual pressure inside the battery pack, thus reducing its safety performance. Summary of the Invention

[0004] In view of the above problems, this application provides an explosion-proof valve assembly and a battery pack, which can effectively prevent the explosion-proof valve from closing, prolong the pressure relief time, enable the explosion-proof valve to fully vent, maximize the pressure relief, and improve the safety performance of the battery pack.

[0005] To achieve the above objectives, a first aspect of this application provides an explosion-proof valve assembly for a battery pack. The explosion-proof valve assembly includes an explosion-proof valve and a check mechanism, wherein the check mechanism is disposed on the side of the explosion-proof valve. The explosion-proof valve includes a valve body and a valve cover, and the check mechanism includes a check element. When the battery pack is depressurized, the valve cover opens relative to the valve body, and at least a portion of the check element is engaged between the valve cover and the valve body.

[0006] In one feasible implementation, the check valve is movably disposed on the side of the explosion-proof valve; the check valve has a preload force that causes it to rotate or move toward the explosion-proof valve.

[0007] In one possible implementation, the anti-reverse mechanism further includes a first elastic element that abuts against the anti-reverse element, the first elastic element being configured to apply a force to the anti-reverse element that rotates or moves toward the explosion-proof valve.

[0008] In one feasible implementation, the explosion-proof valve is disposed in the pressure relief hole of the battery pack, the pressure relief hole is provided with a rotating shaft hole on the side, and one end of the check valve is provided with a rotating sleeve, the rotating sleeve being rotatably disposed in the rotating shaft hole;

[0009] The first elastic element is a torsion spring, which passes through the rotating sleeve; a limiting protrusion is provided on the side of the rotating shaft hole, the first end of the torsion spring is engaged with the limiting protrusion, and the second end of the torsion spring is engaged with the bottom wall of the rotating sleeve.

[0010] In one feasible implementation, the bottom wall of the rotating sleeve is provided with a fixing groove extending circumferentially therein, and the second end of the torsion spring is engaged in the fixing groove; and / or,

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

[0012] In one possible implementation, the anti-reverse mechanism further includes a first connector that passes through the rotating sleeve and is connected to the bottom of the rotating shaft hole; the outer wall of the first connector has a gap with the inner wall of the rotating sleeve; and at least a portion of the top of the first connector is positioned above the rotating sleeve.

[0013] In one feasible implementation, the check valve is a spring with a fixed end and a free end at its two ends. 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 resets and inserts between the valve cover and the valve body.

[0014] In one feasible implementation, at least a portion of the structure of the check valve extends along the outer edge of the explosion-proof valve, and the thickness of the check valve on the side facing the explosion-proof valve is less than the thickness of the check valve on the side away from the explosion-proof valve.

[0015] In one feasible implementation, a floating switch is further included, which is movably disposed on the side of the explosion-proof valve along the opening and closing direction of the valve cover; the floating switch abuts against the side of the valve cover opposite to the valve body.

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

[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 separates from the check valve, so that the check valve is engaged between the valve cover and the valve body.

[0018] In one feasible implementation, the floating switch has an abutment portion that 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-reverse member has a limiting hole at one end facing the floating switch, the limiting portion being inserted into or separated from the limiting hole as the floating switch moves.

[0019] In one possible implementation, a second elastic element and a second connecting element are further included. The second connecting element is disposed on the side of the explosion-proof valve. The second elastic element is sleeved on the second connecting element. One end of the second elastic element abuts against the float switch, and the other end of the second elastic element abuts against the second connecting element. The second elastic element is configured to apply a force toward the valve cover to the float switch.

[0020] In one feasible implementation, the explosion-proof valve is disposed in the pressure relief hole of the battery pack, and a guide groove is provided on the side of the pressure relief hole. The floating switch has a sliding part, which is inserted into the guide groove. The cross-sectional shape of the sliding part matches the cross-sectional shape of the guide groove. The guide groove has multiple limiting surfaces, which are sequentially connected and surround the periphery of the sliding part.

[0021] A second aspect of this application provides a battery pack including a housing, a battery cell, and an explosion-proof valve assembly. The battery cell is disposed inside the housing, and a pressure relief hole is provided on the side of the housing. The explosion-proof valve assembly is disposed in the pressure relief hole.

[0022] In one feasible implementation, a protective cover is also included, which is disposed on the outside of the explosion-proof valve assembly and connected to the housing, and the side wall of the protective cover is provided with an exhaust port.

[0023] In one feasible implementation, there are multiple pressure relief holes distributed at different locations on the periphery of the housing, and at least one of the pressure relief holes is equipped with the explosion-proof valve assembly.

[0024] This application provides an explosion-proof valve assembly and a battery pack, including an explosion-proof valve and a check mechanism. When the battery pack is depressurized, at least a portion of the check mechanism engages between the valve cover and the valve body. During the depressurization process, the check mechanism effectively prevents the explosion-proof valve from closing, prolonging the depressurization time and allowing the explosion-proof valve to fully release air, maximizing depressurization and improving the safety performance of the battery pack. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

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

[0027] Figure 3 for Figure 2 A partially enlarged structural diagram of section I;

[0028] Figure 4 An exploded view of the assembly of the die-cast beam and explosion-proof valve assembly provided in the embodiments of this application;

[0029] Figure 5 This is a schematic diagram of the structure of the explosion-proof valve assembly provided in the embodiments of this application;

[0030] Figure 6 This is a schematic diagram of the structure of the explosion-proof valve and the check valve mechanism provided in the embodiments of this application;

[0031] Figure 7 This is a schematic diagram of the anti-reverse mechanism and floating switch provided in the embodiments of this application;

[0032] Figure 8 A front structural diagram of the anti-reverse mechanism provided in the embodiments of this application;

[0033] Figure 9 A schematic diagram of the back structure of the anti-reverse mechanism provided in the embodiments of this application;

[0034] Figure 10 This is a schematic diagram of the structure of the floating switch provided in an embodiment of this application;

[0035] Figure 11 This is a schematic diagram of a structure with pressure relief holes on a die-cast beam provided in an embodiment of this application;

[0036] Figure 12 This is a schematic diagram of the structure of the pressure relief hole provided in an embodiment of this application;

[0037] Figure 13 This is a schematic diagram of the structure of the pivot hole and the limiting protrusion provided in the embodiments of this application;

[0038] Figure 14 This is a schematic diagram of the structure of the guide groove provided in an embodiment of this application;

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

[0040] Explanation of reference numerals in the attached figures:

[0041] 100-Explosion-proof valve assembly;

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

[0043] 120 - Anti-reverse mechanism; 121 - Anti-reverse component; 1211 - Limiting hole;

[0044] 122 - First elastic element; 123 - Rotating sleeve; 124 - Fixed groove;

[0045] 125 - First connector; 130 - Floating switch; 131 - Abutment part;

[0046] 132 - Limiting part; 133 - Sliding part; 140 - Second elastic element;

[0047] 150 - Second connector; 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-cast beam. Detailed Implementation

[0052] When the gas pressure inside the battery pack increases, the explosion-proof valve opens, allowing the internal gas to escape. In related technologies, as the internal pressure of the battery pack decreases, if the pressure relief process is less than or equal to the opening pressure of the explosion-proof valve, the valve will automatically rebound due to its spring structure, closing the pressure relief. However, this is insufficient to release the high pressure inside the battery pack in a short time. Inadequate pressure relief leaves a significant residual pressure inside the battery pack, resulting in lower safety performance and increasing the risk of accidents.

[0053] To address the aforementioned technical problems, this application provides an explosion-proof valve assembly and a battery pack, including an explosion-proof valve and a check mechanism. When the battery pack is depressurized, at least a portion of the check mechanism engages between the valve cover and the valve body. During depressurization, the check mechanism effectively prevents the explosion-proof valve from closing, prolonging the depressurization time and allowing the explosion-proof valve to fully release air, maximizing depressurization and improving the safety performance of the battery pack.

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] Reference Figures 1 to 3 As shown, this application embodiment provides a battery pack 200, including a housing 210 and battery cells. The battery cells are disposed inside the housing 210, and a pressure relief hole 211 is provided on the side of the housing 210 (see reference). Figure 11 and Figure 12 (As shown). Specifically, the housing 210 includes a die-cast beam 250, and a pressure relief hole 211 is provided on the die-cast beam 250.

[0056] It is understandable that the battery pack 200 will generate heat during operation, which will cause the internal air pressure to rise. Without the 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, maintain the balance of internal and external air pressure, 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 the internal gas is discharged outwards and to ensure the safety performance of the battery pack 200, reference is made in this embodiment. Figures 4 to 6 As shown, the battery pack 200 also includes an explosion-proof valve assembly 100, which is disposed on the pressure relief port 211. Thus, when the internal pressure of the battery pack 200 reaches a set value, the explosion-proof valve assembly 100 opens from the pressure relief port 211 to release pressure; when the pressure drops below the set value, the explosion-proof valve assembly 100 returns to its original sealed state. The explosion-proof valve assembly 100 can be mounted on the pressure relief port 211 using fastening screws 170.

[0058] In this embodiment, the number of pressure relief holes 211 is not limited. For example, there can be multiple pressure relief holes 211, which can be distributed at different locations on the housing 210. At least one pressure relief hole 211 can be equipped with an explosion-proof valve assembly 100. For example, one pressure relief hole 211 can use the explosion-proof valve assembly 100 of this application, while the remaining pressure relief holes 211 can use ordinary explosion-proof valves 110. This embodiment does not limit this, and the specific configuration can be determined according to actual needs.

[0059] To improve the sealing performance of the explosion-proof valve assembly 100, in this embodiment, reference is made to... Figure 4 As shown, the battery pack 200 may also include a protective cover 160, which covers the outside of the explosion-proof valve assembly 100 and is connected to the housing 210. The side wall of the protective cover 160 is provided with an exhaust port.

[0060] It is understandable that the protective cover 160 being placed on the outside of the explosion-proof valve assembly 100 means that the protective cover 160 is located on the 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 and effectively prevents impacts to the explosion-proof valve assembly 100 and impacts from external foreign objects. Simultaneously, an exhaust port is provided on the protective cover 160 so that when the battery pack 200 experiences thermal runaway, venting can be carried out through the exhaust port, improving safety performance. The opening position of the exhaust port can be set according to the specific exhaust direction; this embodiment does not limit this.

[0062] Furthermore, the shape of the protective cover 160 is not limited. For example, the protective cover 160 can be cloud-shaped. The cloud-shaped protective cover 160 can effectively protect the explosion-proof valve assembly 100 from external damage, such as dust, contamination, corrosion, or impact. Additionally, the cloud-shaped protective cover 160 has good sealing and load-bearing capacity, further improving the protection of the explosion-proof valve assembly 100. Furthermore, the cloud-shaped protective cover 160 has a smooth and flat surface, which can improve the appearance quality and overall aesthetics of the equipment. This embodiment does not limit this aspect.

[0063] During the depressurization process of the battery pack 200, if the depressurization pressure is less than or equal to the opening pressure of the explosion-proof valve 110, the explosion-proof valve 110 may automatically return to the closed state before the depressurization is complete, leading to incomplete depressurization. Therefore, in order to fully depressurize and improve the safety performance of the battery pack 200, this embodiment provides an explosion-proof valve assembly 100.

[0064] Reference Figure 5 and Figure 6 As shown, the explosion-proof valve assembly 100 may include an explosion-proof valve 110 and a check mechanism 120. The explosion-proof valve 110 includes a valve body 111 and a valve cover 112, and the check mechanism 120 includes a check element 121. When the battery pack 200 is depressurized, the valve cover 112 opens relative to the valve body 111, and at least a portion of the structure of the check element 121 is engaged between the valve cover 112 and the valve body 111.

[0065] In this embodiment, the location of the check mechanism 120 is not limited. For example, in this embodiment, the check mechanism 120 is mainly described as being located on the side of the explosion-proof valve 110. In this way, the check mechanism 120 will not interfere with the opening or closing of the valve cover 112 relative to the valve body 111, and it will not affect the assembly of the explosion-proof valve 110.

[0066] In this embodiment, the shape of the anti-reverse component 121 is not limited. For example, refer to... Figures 7 to 9 As shown, the check valve 121 can be a rotating curved blade check valve structure. This design has two advantages: firstly, the curved blade can better lock between the valve cover 112 and the valve body 111, reducing locking resistance; secondly, this design can adapt to explosion-proof valves 110 of different shapes and sizes.

[0067] The anti-reverse mechanism 120 in this embodiment has the following anti-reverse function: When the explosion-proof valve 110 is subjected to an internal pressure of more than 3 kPa from the battery pack 200, the valve cover 112 of the explosion-proof valve 110 opens relative to the valve body 111. At this time, the anti-reverse component 121 is in the open state and is locked between the valve cover 112 and the valve body 111, thereby locking 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 this application embodiment, the anti-reverse mechanism 120 can effectively prevent the explosion-proof valve 110 from closing during the pressure relief process, prolonging the pressure relief time. The explosion-proof valve 110 can fully vent gas, which can minimize the situation where the residual gas pressure is too high after heat diffusion inside the pack, thereby reducing the risk of heat diffusion. This allows the valve to remain open even when the pressure relief is lower than the valve closing threshold, achieving complete pressure relief and improving the safety performance of the battery pack 200.

[0069] In one feasible implementation, the check valve 121 is movably disposed on the side of the explosion-proof valve 110; the check valve 121 has a preload force that causes it to rotate or move toward the explosion-proof valve 110.

[0070] In this embodiment, the method of providing the preload is not limited. For example, the preload may be provided by an elastic element such as a spring, or it may be provided by itself, for example, the anti-reverse element 121 itself is a spring sheet structure. This embodiment does not limit this.

[0071] It is understood that limiting the check valve 121 to a movable configuration allows for its movement, thereby facilitating its engagement between the valve cover 112 and the valve body 111. The manner of movement of the check valve 121 is not limited. For example, the check valve 121 can rotate to move between the valve cover 112 and the valve body 111; or, it can translate to move between the valve cover 112 and the valve body 111. This embodiment does not impose any limitations on this.

[0072] In order to achieve the movement of the anti-reverse element 121, in one feasible embodiment, refer to Figure 8 and Figure 9 As shown, the anti-reverse mechanism 120 may include a first elastic element 122, which abuts against the anti-reverse element 121. The first elastic element 122 is configured to apply a force to the anti-reverse element 121 to rotate or move toward the explosion-proof valve 110.

[0073] In this embodiment, the structure of the first elastic element 122 is not limited. For example, the first elastic element 122 can be a spring, which can apply a linear force to the anti-reverse member 121; or, the first elastic element 122 can be a torsion spring, which can apply a rotational force to the anti-reverse member 121. This embodiment does not limit this. Furthermore, the contact method between the first elastic element 122 and the anti-reverse member 121 is also not limited.

[0074] In one feasible implementation, refer to Figures 11 to 13 As shown, the explosion-proof valve 110 is disposed in the pressure relief hole 211 of the battery pack 200. In this embodiment, a pivot hole 220 may be provided on the side of the pressure relief hole 211, and a rotating sleeve 123 may be provided at one end of the check member 121, the rotating sleeve 123 being rotatably disposed in the pivot hole 220. The first elastic member 122 is a torsion spring, which passes through the rotating sleeve 123.

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

[0076] In order to fix the anti-rotation sleeve 123, in this embodiment of the application, reference is made to... Figures 12 to 14As shown, a limiting protrusion 230 can 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. This helps to fix the rotating sleeve 123. Moreover, the limiting structure does not contact the check valve 121, thereby ensuring that the check valve 121 can rotate flexibly, and then rotate between the valve cover 112 and the valve body 111 when the valve cover 112 is opened.

[0077] In one feasible implementation, when the rotating sleeve 123 is fixed, wherein, referring to Figure 9 As shown, the bottom wall of the rotating sleeve 123 may be provided with a fixing groove 124 extending circumferentially therein, and the second end of the torsion spring is engaged in the fixing groove 124. Alternatively, refer to... Figure 13 As shown, the limiting protrusion 230 may have a limiting groove 231, the first end of the torsion spring passes through the limiting groove 231, and at least part of the first end of the torsion spring is structurally blocked on the side of the limiting protrusion 230 away from the rotating shaft hole 220. This embodiment does not limit this.

[0078] This helps to improve the fixing effect on the rotating sleeve 123. In addition, the first end of the torsion spring is at least partially blocked by the limiting protrusion 230 on the side away from the rotating shaft hole 220. This helps to prevent the torsion spring from coming out of the limiting sleeve, thereby maximizing the fixing stability of the torsion spring and the rotating sleeve 123.

[0079] In one feasible implementation, refer to Figure 7 and Figure 15 As shown, the anti-reverse mechanism 120 may further include a first connector 125, which passes through the rotating sleeve 123 and is connected to the bottom of the rotating shaft hole 220; the outer wall of the first connector 125 has a gap with the inner wall of the rotating sleeve 123; at least part of the top of the first connector 125 is blocked above the rotating sleeve 123.

[0080] In this embodiment, the type of the first connector 125 is not limited. For example, the first connector 125 can be a screw, wherein at least a portion of the top structure of the first connector 125 is a screw nut. In this way, by placing the nut above the rotating sleeve 123, the first end of the torsion spring can be further fixed and closed, thereby ensuring that the anti-reverse member 121 can rotate flexibly.

[0081] In this embodiment, a gap is defined between the outer wall of the first connector 125 and the inner wall of the rotating sleeve 123, which helps to avoid the problem of jamming between the first connector 125 and the rotating sleeve 123, and thus facilitates the rotation of the rotating sleeve 123.

[0082] There is no limit to the specific value of the gap; it can be set according to actual needs.

[0083] In one feasible implementation, the check valve 121 can be a spring with a fixed end and a free end at its two ends. 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 to a torsion spring, the spring has a relatively simpler structure, making installation easier and operation and maintenance simpler; in addition, the manufacturing cost of the spring is relatively low. This embodiment does not limit this aspect.

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

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

[0087] In this embodiment, the check valve 121 has a curved blade structure and a relatively long length. When the explosion-proof valve 110 is opened, the check valve 121, under the torsional force of the spring, rotates and cuts into the explosion-proof valve 110. This helps to increase the cutting area between the check valve 121 and the explosion-proof valve 110, thereby helping to ensure that the explosion-proof valve 110 remains open even when the venting process reaches its final stage. This effectively prevents the explosion-proof valve 110 from closing, allowing the explosion-proof valve 110 to vent fully and achieve complete pressure relief.

[0088] In this embodiment, the thickness of the check valve 121 on the side facing the explosion-proof valve 110 is less than the thickness of the check valve 121 on the side away from the explosion-proof valve 110. This allows the thinner side of the check valve 121 to rotate and cut into the explosion-proof valve 110. This design reduces the force required for cutting in, making it easier for the thinner side to cut into the explosion-proof valve 110, while the thicker side provides better strength and durability.

[0089] In one feasible implementation, refer to Figure 10 As shown, it may also include a float switch 130, which is movably disposed on the side of the explosion-proof valve 110 along the opening and closing direction of the valve cover 112; the float switch 130 abuts against the 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 element 121; when the valve cover 112 is open relative to the valve body 111, the valve cover 112 pushes the floating switch 130 to move, and the floating switch 130 separates from the check element 121, so that the check element 121 is locked between the valve cover 112 and the valve body 111.

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

[0092] In one feasible implementation, refer to Figure 10 As shown, the float 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 float switch 130 has a limiting portion 132, and the anti-reverse member 121 has a limiting hole 1211 at one end facing the float switch 130. The limiting portion 132 is inserted into or separated from the limiting hole 1211 as the float switch 130 moves.

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

[0094] The movement process of the floating switch 130 in this embodiment is as follows: When the battery pack 200 is working normally, the abutment part 131 presses on 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 opens. After opening, it will push up the floating switch 130. During the upward movement of the floating switch 130, the limiting part 132 separates from the limiting hole 1211, thereby causing the floating switch 130 to disengage from the anti-reverse member 121. After disengagement, the anti-reverse member 121 is in an open state.

[0095] In one feasible implementation, refer to Figure 10 As shown, it may also include a second elastic member 140 and a second connecting member 150. The second connecting member 150 is disposed 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 float 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 float switch 130.

[0096] In this embodiment, 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 preload to the float switch 130, which helps to hold the float switch 130 in place. In this embodiment, the structure of the second connector 150 is not limited. For example, the second connector 150 is a stud.

[0097] In one feasible implementation, the explosion-proof valve 110 is disposed at the pressure relief port 211 of the battery pack 200, wherein, referring to Figure 12 and Figure 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 part 133, which 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 multiple limiting surfaces 241, which are connected in sequence and surround the periphery of the sliding part 133.

[0098] In this embodiment, the number of 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 part 133 to play a certain limiting role on the floating switch 130, reducing the floating switch 130 from floating to both sides, thereby ensuring the vertical floating of the floating switch 130.

[0099] The bottom of the guide groove 240 is provided with a guide hole, and the second connector 150 of the float switch 130 is assembled in the guide hole.

[0100] This application provides an explosion-proof valve assembly and a battery pack, including an explosion-proof valve and a check mechanism. When the battery pack is depressurized, at least a portion of the check mechanism engages between the valve cover and the valve body. During depressurization, the check mechanism effectively prevents the explosion-proof valve from closing, prolonging the depressurization time and allowing the explosion-proof valve to fully release air, maximizing depressurization and improving the safety performance of the battery pack.

[0101] It should be noted that, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0102] In the description of the embodiments of this application, the term "and / or" merely indicates a relationship describing the associated objects, meaning that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the term "at least one" indicates any combination of at least two of a plurality of options, for example, including at least one of A, B, and C, which can represent any one or more elements selected from a set including communication between A, B, and C.

[0103] In the description of the embodiments of this application, the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the term "multiple" means two or more, unless otherwise precisely specified.

[0104] In the description of the embodiments of this 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 sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An explosion-proof valve assembly, characterized in that, For use in a battery pack, the explosion-proof valve assembly includes an explosion-proof valve (110) and a check mechanism (120), the check mechanism (120) being disposed on the side of the explosion-proof valve (110); the explosion-proof valve (110) includes a valve body (111) and a valve cover (112), the check mechanism (120) including a check element (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 check element (121) is engaged between the valve cover (112) and the valve body (111); The check valve (121) is movably disposed on the side of the explosion-proof valve (110); the check valve (121) has a preload force that causes it to rotate or move toward the explosion-proof valve (110); The anti-reverse mechanism (120) further includes a first elastic element (122), which abuts against the anti-reverse element (121). The first elastic element (122) is configured to apply a force to the anti-reverse element (121) to rotate or move toward the explosion-proof valve (110).

2. The explosion-proof valve assembly according to claim 1, characterized in that, The explosion-proof valve (110) is disposed in the pressure relief hole (211) of the battery pack. A rotating shaft hole (220) is provided on the side of the pressure relief hole (211). A rotating sleeve (123) is provided at one end of the anti-reverse component (121). The rotating sleeve (123) is rotatably disposed in the rotating shaft hole (220). The first elastic element (122) is a torsion spring, which passes through 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 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).

3. The explosion-proof valve assembly according to claim 2, characterized in that, The bottom wall of the rotating sleeve (123) is provided with a fixing groove (124) extending circumferentially therein, and the second end of the torsion spring is engaged in the fixing groove (124); and / or, The limiting protrusion (230) has a limiting groove (231), the first end of the torsion spring passes through the limiting groove (231), and at least part of the first end of the torsion spring is structurally blocked to the side of the limiting protrusion (230) away from the rotating shaft hole (220).

4. The explosion-proof valve assembly according to claim 2, characterized in that, The anti-reverse mechanism (120) further includes a first connector (125), which passes through the rotating sleeve (123) and is connected to the bottom of the rotating shaft hole (220); the outer wall of the first connector (125) has a gap with the inner wall of the rotating sleeve (123); at least a portion of the top of the first connector (125) is positioned above the rotating sleeve (123).

5. The explosion-proof valve assembly according to claim 1, characterized in that, The check valve (121) is a spring piece with a fixed end and a free end at its two ends. 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).

6. The explosion-proof valve assembly according to any one of claims 1-5, characterized in that, At least a portion of the structure of the check valve (121) extends along the outer edge of the explosion-proof valve (110), and the thickness of the check valve (121) on the side facing the explosion-proof valve (110) is less than the thickness of the check valve (121) on the side away from the explosion-proof valve (110).

7. The explosion-proof valve assembly according to any one of claims 1-5, characterized in that, It also includes a floating switch (130), which 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 the side of the valve cover (112) 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 valve (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) separates from the check valve (121) so that the check valve (121) is engaged between the valve cover (112) and the valve body (111).

8. The explosion-proof valve assembly according to claim 7, characterized in that, The floating switch (130) has an abutment portion (131) that 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-reverse member (121) facing the floating switch (130); the limiting portion (132) is inserted into or separated from the limiting hole (1211) as the floating switch (130) moves.

9. The explosion-proof valve assembly according to claim 7, characterized in that, It also includes a second elastic element (140) and a second connector (150), the second connector (150) being disposed on the side of the explosion-proof valve (110), the second elastic element (140) being sleeved on the second connector (150), one end of the second elastic element (140) abutting against the float switch (130), and the other end of the second elastic element (140) abutting against the second connector (150); the second elastic element (140) is configured to apply a force toward the valve cover (112) to the float switch (130).

10. The explosion-proof valve assembly according to claim 7, characterized in that, The explosion-proof valve (110) is disposed in the pressure relief hole (211) of the battery pack. A guide groove (240) is provided on the side of the pressure relief hole (211). The floating switch (130) has a sliding part (133), which 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 multiple limiting surfaces (241), which are connected in sequence and surround the periphery of the sliding part (133).

11. The explosion-proof valve assembly according to any one of claims 1-5, characterized in that, The explosion-proof valve assembly also includes a protective cover (160), which covers the outside of the explosion-proof valve (110), and the side wall of the protective cover (160) is provided with an exhaust port.

12. A battery pack, characterized in that, The device includes a housing, a battery cell, and an explosion-proof valve assembly as described in any one of claims 1-11, wherein the battery cell is disposed inside the housing, the housing is provided with a pressure relief hole (211), the explosion-proof valve assembly is disposed in the pressure relief hole (211), and the protective cover (160) of the explosion-proof valve assembly is connected to the housing.

13. The battery pack according to claim 12, characterized in that, There are multiple pressure relief holes (211), which 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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