Explosion-proof valve, battery device and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to an anti-explosion valve, a battery device and electric equipment. The anti-explosion valve comprises an anti-explosion valve main body, an anti-explosion valve core, an anti-explosion valve core, an anti-explosion valve core, an anti-explosion valve core and an anti-explosion valve core, the movable part comprises a valve cover and a valve column which are connected with each other, and the valve column is movably arranged in the through opening in a penetrating mode so that the valve cover can close or open the air hole; the limiting piece is arranged between the valve column and the through opening; the limiting piece is used for generating friction force when the valve cover moves towards the direction of the anti-explosion valve body so as to limit the valve cover to continuously move towards the direction of the anti-explosion valve body. When the gas production rate of thermal runaway is reduced, the air pressure in the battery pack is reduced, the valve cover moves inwards under the action of stress and drives the valve column to move inwards, and at the moment, the limiting piece can generate friction force with the valve column to hinder the movement of the valve column, so that the anti-explosion valve is in a valve opening state; therefore, the explosion-proof valve is prevented from being blocked by foreign matters and cannot be opened when subsequent thermal runaway is more severe.

Description

Technical Field

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

[0002] Because lithium-ion batteries are prone to short-circuit runaway during use, explosion-proof valves are typically installed in the battery casing during assembly and manufacturing. This allows for rapid degassing, pressure relief, heat release, and cooling in the event of thermal runaway, improving battery safety. Spring-loaded explosion-proof valves are often used as the primary mounting structure for explosion-proof valves in battery packs due to their precise opening pressure control and ease of customization.

[0003] However, the spring-type explosion-proof valve has a small pressure relief area during thermal runaway and is prone to failure due to blockage and adhesion of foreign matter during repeated opening and closing, ultimately failing to vent air normally, causing the battery pack explosion-proof valve to fail. Summary of the Invention

[0004] Based on this, the present application provides an explosion-proof valve, a battery device and an electrical device to solve the problem of explosion-proof valve failure due to blockage by foreign matter.

[0005] In one aspect, the present application provides an explosion-proof valve, comprising:

[0006] The explosion-proof valve body has a through-hole and a vent hole, and the through-hole and the vent hole are arranged at intervals;

[0007] The movable part includes a valve cover and a valve stem connected to each other, and the valve stem is movably arranged in the through-hole to close or open the air vent of the valve cover;

[0008] A limiter, which is provided between the valve stem and the through-hole;

[0009] The limiter is used to generate friction when the valve cover moves toward the explosion-proof valve body, so as to limit the valve cover from continuing to move toward the explosion-proof valve body.

[0010] In a possible implementation, a limiting groove is provided on the explosion-proof valve body, the limiting groove being in communication with the through-port; and a limiting member is movably disposed in the limiting groove;

[0011] The opening size of the limit groove gradually decreases along the direction from the valve cover to the explosion-proof valve body, so that the limit piece abuts against the valve column and the groove wall of the limit groove when the valve cover moves toward the explosion-proof valve body.

[0012] In a possible implementation, the cross-section of the limiting member is circular or gear-shaped, and the cross-section is any plane passing through the center line of the through-opening.

[0013] In a possible implementation, the limiting groove is an annular groove or an arc-shaped groove.

[0014] In a possible implementation, the limiting member is a ring, a sphere, or a semi-ring.

[0015] In a possible implementation, a plurality of limiting grooves are provided, and the plurality of limiting grooves are arranged at intervals around the through opening.

[0016] In a possible implementation, on a cross section passing through the center line of the through opening, the maximum width of the limit member is greater than the minimum width of the limit groove away from the valve cover, and smaller than the maximum width of the limit groove close to the valve cover.

[0017] In a possible implementation, along the direction of opening of the through-opening, the maximum height of the limiting member is smaller than the depth of the limiting groove.

[0018] In a possible implementation, the limiting groove is semi-conical.

[0019] In a possible implementation, the limiting member is a sphere, and the diameter of the limiting member ranges from 2.5 mm to 3.0 mm; and / or, along the opening direction of the through opening, the depth of the limiting groove ranges from 4.0 mm to 6.0 mm.

[0020] In one possible implementation, the limit member is a sphere, the diameter range of the limit member is 2.5mm-3.0mm, and / or the diameter range of the limit groove close to the valve cover side is 5.0mm-6.0mm, and / or the diameter range of the limit groove away from the valve cover side is 1.0mm-1.5mm.

[0021] In a possible implementation, the surface of the limiting member is a frosted surface.

[0022] In a possible implementation, the explosion-proof valve body is further provided with a stopper, which is provided on a side of the limiting groove close to the valve cover.

[0023] In one possible implementation, the explosion-proof valve further includes an elastic member, which is sleeved on the valve column and located on the side of the explosion-proof valve body away from the valve cover. The elastic member is used to push the movable member to move the valve cover up and down to support the explosion-proof valve body.

[0024] In a possible implementation, the movable member further includes a base connected to a side of the valve column away from the valve cover, and one end of the elastic member abuts against the explosion-proof valve body, and the other end abuts against the base.

[0025] In one possible implementation, an inner sealing groove is provided on the side of the explosion-proof valve body facing the valve cover, and the inner sealing groove is arranged around the air vent. The explosion-proof valve also includes an inner seal, which is arranged in the inner sealing groove to seal the connection valve and the explosion-proof valve body.

[0026] In one possible implementation, an outer sealing groove is provided on the side of the explosion-proof valve body away from the valve cover, and the outer sealing groove is arranged around the air vent. The explosion-proof valve also includes an outer seal, which is arranged in the outer sealing groove to seal the connection between the explosion-proof valve body and the shell of the battery device.

[0027] In a possible implementation, there are multiple air holes, and the multiple air holes are arranged at intervals around the through opening.

[0028] On the other hand, the present application provides a battery device, including a housing, a battery and the above-mentioned explosion-proof valve, the battery is arranged in the housing, the housing has an exhaust port, and the explosion-proof valve is arranged at the exhaust port.

[0029] On the other hand, the present application provides an electrical device including the above-mentioned battery device.

[0030] The explosion-proof valve, battery device, and electrical equipment provided by the present application are designed to provide a limiter between the through-port and the valve stem, so that the limiter generates friction when the valve cover moves toward the main body of the explosion-proof valve, thereby limiting the valve cover from continuing to move toward the main body of the explosion-proof valve. As a result, when the explosion-proof valve is opened, the valve cover responds to the air pressure in the battery pack and moves outward, driving the valve stem outward. During this movement, there is no friction between the valve stem and the limiter. When the gas production rate due to thermal runaway decreases, the air pressure in the battery pack decreases, and the valve cover moves inward under the force, driving the valve stem inward. At this time, the limiter can generate friction with the valve stem, hindering the movement of the valve stem and placing the explosion-proof valve in an open state, thereby preventing the explosion-proof valve from being blocked by foreign matter and unable to open when the subsequent thermal runaway becomes more severe. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic diagram of the structure of the explosion-proof valve provided in an embodiment of the present application;

[0033] Figure 2 for Figure 1 A schematic structural diagram of the explosion-proof valve from another perspective;

[0034] Figure 3 for Figure 1 The schematic diagram of the structure of the explosion-proof valve when it is opened is shown;

[0035] Figure 4 for Figure 1 The schematic diagram of the structure of the explosion-proof valve when it is self-locking;

[0036] Figure 5 for Figure 1 A schematic structural diagram of another limiting groove and limiting member of the explosion-proof valve shown;

[0037] Figure 6 for Figure 5 A schematic structural diagram of the limiting groove and the limiting member from another perspective;

[0038] Figure 7 for Figure 1 A schematic structural diagram of another limiting groove and limiting member of the explosion-proof valve shown;

[0039] Figure 8 for Figure 7 A schematic structural diagram of the limiting groove and the limiting member from another perspective is shown.

[0040] Description of reference numerals:

[0041] 100-explosion-proof valve; 10-explosion-proof valve body; 11-through port; 12-limiting groove; 13-stopper; 14-inner sealing groove; 15-vent; 16-outer sealing groove; 20-movable part; 21-valve cover; 22-valve column; 23-base; 30-limiting part; 40-elastic part; 50-inner sealing part; 60-outer sealing part. DETAILED DESCRIPTION

[0042] 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 preferred 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 understood 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. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0045] The terms "first", "second" and "third" (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0046] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0047] Because lithium-ion batteries are prone to short-circuit runaway during use, explosion-proof valves are typically installed in the battery casing during assembly and manufacturing. This allows for rapid degassing, pressure relief, heat release, and cooling in the event of thermal runaway, improving battery safety. Spring-loaded explosion-proof valves are often used as the primary mounting structure for explosion-proof valves in battery packs due to their precise opening pressure control and ease of customization.

[0048] However, the spring-type explosion-proof valve has a small pressure relief area during thermal runaway and is prone to failure due to blockage and adhesion of foreign matter during repeated opening and closing, ultimately failing to vent air normally, causing the battery pack explosion-proof valve to fail.

[0049] After repeated thinking and verification, the inventors discovered that if a groove that is wide at the top and narrow at the bottom is set next to the valve stem, and a metal insert with reliable rigidity and high surface roughness is set in the groove, so that the metal insert is in a free and interference state at both ends of the groove, respectively, when thermal runaway of the battery pack occurs, the valve stem can respond to the air pressure in the pack and displace outward, and the metal insert is in a free state under the action of inertia. During this process, there is no friction between the valve stem and the metal insert, and normal exhaust action is not interfered with. When the gas production rate of thermal runaway decreases, the air pressure in the pack decreases, and the valve stem rebounds inward, causing the metal insert to undergo a slight displacement and enter an interference state, forming a highly squeezed state with the groove wall and the valve stem. At this time, the metal insert hinders the rebound of the valve stem, so that the spring valve reaches a fully self-locking state, which can prevent the spring valve from being blocked by foreign matter and unable to open when the subsequent thermal runaway is more severe.

[0050] In view of this, the present application provides an explosion-proof valve, including: an explosion-proof valve body, the explosion-proof valve body having a through-port and an air vent, the through-port and the air vent being arranged at intervals; a movable part, the movable part including a valve cover and a valve column connected to each other, the valve column being movably arranged in the through-port to enable the valve cover to close or open the air vent; a limiter, the limiter being arranged between the valve column and the through-port; the limiter is used to generate friction when the valve cover moves toward the explosion-proof valve body, so as to limit the valve cover from continuing to move toward the explosion-proof valve body.

[0051] By providing a limiter between the through-hole and the valve stem, the limiter generates friction when the valve cover moves toward the main body of the explosion-proof valve, thereby limiting the valve cover from further movement toward the main body of the explosion-proof valve. As a result, when the explosion-proof valve is opened, the valve cover responds to the air pressure in the battery pack and moves outward, driving the valve stem outward. During this movement, there is no friction between the valve stem and the limiter. When the gas production rate due to thermal runaway decreases, the air pressure in the battery pack decreases, and the valve cover moves inward under the force, driving the valve stem inward. At this time, the limiter can generate friction with the valve stem, hindering its movement and keeping the explosion-proof valve in an open state, thereby preventing the explosion-proof valve from being blocked by foreign matter and unable to open when the thermal runaway becomes more severe.

[0052] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0053] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve provided in an embodiment of the present application. Figure 2 for Figure 1 A schematic structural diagram of the explosion-proof valve from another perspective is shown. Figure 3 for Figure 1 The diagram shows the structure of the explosion-proof valve when it is open. Figure 4 for Figure 1 The schematic diagram of the explosion-proof valve is shown in FIG. Figure 5 for Figure 1 The diagram shows the structure of another limit groove and limit member of the explosion-proof valve. Figure 6 for Figure 5 A schematic structural diagram of the limiting groove and the limiting member from another perspective is shown. Figure 7 for Figure 1 The diagram shows the structure of another limiting groove and limiting member of the explosion-proof valve. Figure 8 for Figure 7 A schematic structural diagram of the limiting groove and the limiting member from another perspective is shown.

[0054] like Figure 1 and Figure 2 As shown, an explosion-proof valve 100 provided in an embodiment of the present application is used in a battery device.

[0055] The explosion-proof valve 100 includes an explosion-proof valve body 10, a movable member 20, and a stopper 30. The explosion-proof valve body 10 is disposed on the housing of the battery device. The movable member 20 and the stopper 30 are respectively disposed on the explosion-proof valve body 10.

[0056] The explosion-proof valve body 10 has a through-port 11 and a vent 15. The through-port 11 and vent 15 are spaced apart. The through-port 11 extends through both sides of the explosion-proof valve body 10. The movable member 20 includes a valve cover 21 and a valve stem 22. The valve cover 21 is connected to the valve stem 22. The valve stem 22 is movably inserted through the through-port 11, allowing the valve cover 21 to close or open the vent 15.

[0057] In some possible implementations, the explosion-proof valve 100 is a spring-loaded explosion-proof valve, but is not limited thereto. In other possible implementations, the explosion-proof valve 100 may also be an electromagnetically driven one-way valve.

[0058] The explosion-proof valve 100 also includes an elastic member 40. This elastic member 40 is mounted on the valve stem 22 and is located on the side of the explosion-proof valve body 10 that is away from the valve cover 21. One end of the elastic member 40 abuts against the explosion-proof valve body 10, while the other end abuts against the end of the valve stem 22 that is away from the explosion-proof valve body 10. The elastic member 40 is used to push against the movable member 20, causing the valve cover 21 to move up and down, thereby abutting against the explosion-proof valve body 10.

[0059] Under the action of the elastic member 40, the valve cover 21 moves toward the explosion-proof valve body 10, thereby forming a seal between the valve cover 21 and the explosion-proof valve body 10. When the explosion-proof valve 100 is opened, the valve stem 22, under the action of the gas pressure in the battery, overcomes the elastic force of the elastic member 40 and moves outward, causing the valve cover 21 to move away from the explosion-proof valve body 10, thereby forming a gap between the valve cover 21 and the explosion-proof valve body 10, allowing the gas in the battery to be discharged.

[0060] The limiter 30 is provided between the valve post 22 and the through-hole 11. The limiter 30 is used to generate friction when the valve cover 21 moves toward the explosion-proof valve body 10, so as to limit the valve cover 21 from further moving toward the explosion-proof valve body 10.

[0061] By disposing a stopper 30 between the through-port 11 and the valve stem 22, the stopper 30 generates friction when the valve cover 21 moves toward the explosion-proof valve body 10, thereby limiting the valve cover 21 from further movement toward the explosion-proof valve body 10. As a result, when the explosion-proof valve 100 is opened, the valve cover 21 responds to the air pressure within the battery pack and moves outward, driving the valve stem 22 outward. During this movement, there is no friction between the valve stem 22 and the stopper 30. When the gas production rate due to thermal runaway decreases, the air pressure within the battery pack decreases, and the valve cover 21 is forced to move inward, driving the valve stem 22 inward. At this time, the stopper 30 generates friction with the valve stem 22, hindering its movement and keeping the explosion-proof valve 100 in an open state. This prevents the explosion-proof valve 100 from being clogged by foreign matter and unable to open when the thermal runaway becomes more severe.

[0062] In some possible implementations, the explosion-proof valve body 10 is provided with a limiting groove 12 . The limiting groove 12 is provided around the through-opening 11 and is in communication with the through-opening 11 . The limiting member 30 is movably disposed in the limiting groove 12 .

[0063] The opening size of the limiting groove 12 gradually decreases along the direction from the valve cover 21 to the explosion-proof valve body 10. That is, the limiting groove 12 is configured to be tapered. From the side of the valve cover 21 to the side of the explosion-proof valve body 10, the cross-sectional width of the limiting groove 12 opening gradually decreases from the side wall of the limiting groove 12 away from the valve stem 22 to the side wall of the limiting groove 12 close to the valve stem 22. When the valve cover 21 moves toward the explosion-proof valve body 10, the limiting member 30 abuts against the valve stem 22 and the groove wall of the limiting groove 12. The cross section is any plane passing through the centerline of the through-opening 11.

[0064] That is, along the opening direction of the through opening 11 , the widths of the two sides of the limiting groove 12 are different.

[0065] The gradually decreasing designation indicates that the opening size of the limiting groove 12 can be changed in equal or unequal proportions, and the groove wall of the limiting groove 12 can be a straight inclined surface or an arc surface, etc.

[0066] The limiting member 30 can move in the limiting groove 12 , so that the limiting member 30 can switch between a free state and an interference state.

[0067] Specifically, when the limit member 30 moves toward the side where the limit groove 12 is wider, there is a gap between the limit member 30 and the groove wall of the limit groove 12 or the outer wall of the valve column 22, so that it is in a free state; when the limit member 30 moves toward the side where the limit groove 12 is narrower, the limit member 30 is squeezed with the groove wall of the limit groove 12 and the outer wall of the valve column 22, causing the limit member 30 to enter an interference state.

[0068] In other possible implementations, a limiting groove 12 may be provided on the valve stem 22, the limiting groove 12 being in communication with the through-port 11. A limiting member 30 is movably disposed in the limiting groove 12. The opening size of the limiting groove 12 gradually decreases along the direction from the valve cover 21 to the valve stem 22.

[0069] In some other possible implementations, grooves may be provided on both the valve stem 22 and the explosion-proof valve body 10, and the two grooves may be connected to form a limit groove 12. There is no specific limitation, as long as friction is generated when the valve cover 21 moves toward the explosion-proof valve body 10 to limit the valve cover 21 from further moving toward the explosion-proof valve body 10.

[0070] Therefore, when the battery experiences thermal runaway and the explosion-proof valve 100 opens, the valve cover 21 is displaced outward by the gas pressure within the battery. At this time, the limiter 30, under the action of inertia and the push of the valve stem 22, tends to move toward the wider side of the limit groove 12. A gap exists between the limiter 30 and the valve stem 22, and the limiter 30 is in a free state. During the opening process, there is no friction between the valve stem 22 and the limiter 30. When the gas production rate due to thermal runaway decreases, the gas pressure within the battery decreases, and the valve stem 22 moves inward under the action of the elastic member 40, causing the limiter 30 to move with the valve stem 22 toward the narrower side of the limit groove 12. After a slight displacement, it enters an interference state, and the limiter 30 forms a highly compressed state with the groove wall of the limit groove 12 and the outer wall of the valve stem 22. At this point, the high friction caused by the intense extrusion and the deformation of the stop groove 12 and valve stem 22 further hinder the movement of the valve stem 22, causing the explosion-proof valve 100 to enter a self-locking state. This prevents the explosion-proof valve 100 from being clogged by foreign matter and unable to open during subsequent, more severe thermal runaway events. Furthermore, the machining precision requirements for the stop groove 12 and the stop member 30 in the explosion-proof valve 100 are low, resulting in minimal self-locking stroke loss. This allows the valve to be fixed at its maximum open state at any given time, ensuring exhaust efficiency. This high-opening pressure explosion-proof valve, suitable for high-sealing properties, ensures both reliable sealing and adequate thermal safety for batteries.

[0071] In a possible implementation, along a cross section of a center line passing through the through opening 11 , the cross section of the limiting member 30 is circular or gear-shaped.

[0072] The circular or gear-shaped stopper 30 can move freely within the stopper groove 12, allowing the stopper 30 to switch between a free state and an interference state. Furthermore, the gear-shaped stopper 30 can increase the friction between the groove wall of the stopper groove 12 and the outer wall of the valve stem 22, thereby improving the self-locking effect.

[0073] In a possible implementation, the limiting member 30 is made of metal material. The metal is made of a material with reliable rigidity and high surface roughness so that it hardly deforms under high pressure.

[0074] like Figure 2 As shown, in a possible implementation, the limiting groove 12 is an annular groove or an arc groove. The limiting member 30 is a ring, a sphere or a semi-circular ring. A plurality of spheres can be filled around the annular groove.

[0075] Setting the limiting groove 12 as an annular groove and the limiting member 30 as a circular ring can increase the friction between the limiting member 30 and the outer wall of the valve column 22, thereby improving the self-locking effect. At the same time, the limiting member 30 arranged in a ring shape can also improve the uniformity of the interference force acting on the valve column 22.

[0076] like Figures 5 to 8 As shown, in a possible implementation, a plurality of limiting grooves 12 are provided, and the plurality of limiting grooves 12 are arranged at intervals around the through opening 11 .

[0077] Preferably, the plurality of limiting grooves 12 are evenly spaced around the through opening 11 .

[0078] The limiting grooves 12 and the limiting members 30 arranged therein, which are evenly arranged around the through opening 11 , can improve the uniformity of the interference force acting on the valve stem 22 .

[0079] In one possible implementation, in a cross section passing through the centerline of the through-opening 11, the maximum width of the stopper 30 is greater than the minimum width of the stopper groove 12 on the side away from the valve cover 21, and less than the maximum width of the stopper groove 12 on the side close to the valve cover 21. The minimum and maximum widths of the stopper groove 12 are the widths at both ends of the stopper groove 12, respectively.

[0080] The width setting of the limit member 30 and the limit groove 12 ensures that the limit member 30 can move in the limit groove 12, and at the same time ensures that the limit member 30 can interference contact the valve column 22 in the limit groove 12. Therefore, the width of the limit member 30 needs to be greater than the minimum width of the limit groove 12 and less than the maximum width of the limit groove 12.

[0081] In a possible implementation, along the opening direction of the through opening 11 , the maximum height of the limiting member 30 is smaller than the depth of the limiting groove 12 .

[0082] The height of the limit member 30 and the depth of the limit slot 12 need to be set to ensure that the limit member 30 can move in the limit slot 12, so that the limit member 30 can contact positions of different widths of the limit slot 12. Therefore, the maximum height of the limit member 30 needs to be less than the depth of the limit slot 12, so that the limit member 30 can move in the limit slot 12.

[0083] like Figure 5 and Figure 6 As shown, in a possible implementation, the opening shape of the limiting groove 12 is rectangular. The limiting member 30 is a sphere disposed in the rectangular groove.

[0084] like Figure 7and Figure 8 As shown, in a possible implementation, the limiting groove 12 is semi-conical, with a fan-shaped opening, and the limiting member 30 is a sphere disposed in the fan-shaped groove.

[0085] The conical limiting groove 12 has a more obvious volume change as the height changes, and thus can form a more effective interference-clearance fit between the limiting member 30 and the valve stem 22 with the spherical limiting member 30 .

[0086] In a possible implementation, the limiting member 30 is a sphere, the diameter of the limiting member 30 ranges from 2.5 mm to 3.0 mm, and the depth of the limiting groove 12 along the opening direction of the through opening 11 ranges from 4.0 mm to 6.0 mm.

[0087] In one possible implementation, the limit member 30 is a sphere, the diameter range of the limit member 30 is 2.5mm-3.0mm, the diameter range of the limit groove 12 close to the valve cover 21 is 5.0mm-6.0mm, and the diameter range of the limit groove 12 away from the valve cover 21 is 1.0mm-1.5mm.

[0088] When the diameter range of the limiting groove 12 near the valve cover 21 or away from the valve cover 21 increases, the volume occupancy rate of the limiting member 30 in the limiting groove 12 decreases, and the clearance fit between the limiting member 30 and the valve spool 22 becomes less sufficient. When the diameter range of the limiting groove 12 near the valve cover 21 or away from the valve cover 21 decreases, the volume occupancy rate of the limiting member 30 in the limiting groove 12 increases, and the displacement movement of the limiting member 30 in the limiting groove 12 becomes limited, affecting the opening action of the valve spool 22.

[0089] In a possible implementation, the surface of the limiting member 30 is a frosted surface.

[0090] The rough surface of the frosted surface can provide greater friction and form an interference fit between the stopper 30 and the valve stem 22 .

[0091] In one possible implementation, the surface of the valve stem 22 is smooth. In other possible implementations, the surface of the valve stem 22 may be a rough surface after grinding or sandblasting to further increase the friction between the valve stem 22 and the limiting member 30 .

[0092] In a possible implementation, the explosion-proof valve body 10 is further provided with a stopper 13 , and the stopper 13 is provided on a side of the limiting groove 12 close to the valve cover 21 .

[0093] The setting of the stopper 13 can prevent the limiting member 30 from escaping from the limiting groove 12 .

[0094] In a possible implementation, the movable member 20 further includes a base 23 connected to a side of the valve column 22 away from the valve cover 21 . One end of the elastic member 40 abuts against the explosion-proof valve body 10 , and the other end abuts against the base 23 .

[0095] In a possible implementation, the elastic member 40 is a spring.

[0096] In one possible implementation, an inner sealing groove 14 is provided on the side of the explosion-proof valve body 10 facing the valve cover 21, and the inner sealing groove 14 is arranged around the air vent 15. The explosion-proof valve 100 also includes an inner seal 50, which is arranged in the inner sealing groove 14 to seal the valve cover 21 and the explosion-proof valve body 10.

[0097] When the valve cover 21 squeezes the inner seal 50 , the inner seal 50 is deformed by the load, so that the inner seal 50 fills the gap between the valve cover 21 and the explosion-proof valve body 10 , forming a seal between the valve cover 21 and the explosion-proof valve body 10 .

[0098] In a possible implementation, the explosion-proof valve body 10 is provided with an air vent 15 , and the air vent 15 is located between the inner sealing groove 14 and the through-hole 11 .

[0099] The vent holes 15 are used to achieve waterproof and breathable performance by exchanging internal and external gases under normal pressure conditions, thereby achieving internal and external pressure balance.

[0100] In one possible implementation, an outer sealing groove 16 is provided on the side of the explosion-proof valve body 10 away from the valve cover 21, and the outer sealing groove 16 is arranged around the air vent 15. The explosion-proof valve 100 also includes an outer seal 60, which is arranged in the outer sealing groove 16 to seal the connection between the explosion-proof valve body 10 and the shell of the battery device.

[0101] Specifically, the outer sealing groove 16 and the inner sealing groove 14 are located on both sides of the explosion-proof valve body 10. The explosion-proof valve 100 is provided on the housing of the battery device, and the outer sealing member 60 is provided between the explosion-proof valve body 10 and the housing of the battery device, thereby sealing the gap between the explosion-proof valve 100 and the battery housing.

[0102] In a possible implementation, there are multiple air holes 15 , and the multiple air holes 15 are arranged at intervals around the through opening 11 .

[0103] The explosion-proof valve 100 provided in the embodiment of the present application includes: an explosion-proof valve body 10, a movable part 20, a limiting part 30 and an elastic part 40. The explosion-proof valve body 10 has a through-hole 11, and a limiting groove 12 is provided on the explosion-proof valve body 10. The limiting groove 12 is arranged around the through-hole 11 and is connected to the through-hole 11; the movable part 20 includes a valve cover 21 and a valve column 22. The valve column 22 is inserted into the through-hole 11, and the valve cover 21 is connected to the valve column 22, and the cover is arranged on the explosion-proof valve body 10. On the explosion-proof valve body 10; the limit member 30 is movably arranged in the limit groove 12; the elastic member 40 is sleeved on the valve column 22 and is located on the side of the explosion-proof valve body 10 away from the valve cover 21. The elastic member 40 is used to push the movable member to move the valve cover up and down to support the explosion-proof valve body 10; along the direction from the valve cover 21 to the elastic member 40, the limit groove 12 is configured to be constricted so that when the valve cover 21 moves toward the elastic member 40, the limit member 30 is in contact with the valve column 22.

[0104] By providing a limiting groove 12 adjacent to and communicating with the through-port 11 and disposing a limiting member 30 within the limiting groove 12, the limiting member 30 abuts against the valve stem 22 extending through the through-port 11. The limiting groove 12 is tapered along the direction from the valve cover 21 to the elastic member 40, thereby allowing the limiting member 30 to be free and in an interference fit at both ends of the limiting groove 12. When the explosion-proof valve 100 is opened, the valve cover 21 displaces outward in response to the internal gas pressure of the battery, driving the valve stem 22 outward. The limiting member 30 remains free under the action of inertia, and during this movement, there is no friction between the valve stem 22 and the limiting member 30. When the gas production rate due to thermal runaway decreases, the internal gas pressure of the battery decreases, and the valve stem 22 moves inward under the action of the elastic member 40, causing the limiting member 30 to undergo a slight displacement, thus entering an interference fit, and forming a highly compressed state with the groove wall of the limiting groove 12 and the valve stem 22. At this point, the high friction caused by the intense extrusion and the deformation of the stop groove 12 and valve stem 22 further hinder the movement of the valve stem 22, causing the explosion-proof valve 100 to achieve a fully self-locking state. This prevents the explosion-proof valve 100 from being clogged by foreign matter and unable to open during subsequent, more severe thermal runaway events. Furthermore, the machining precision requirements for the stop groove 12 and the stop member 30 in the explosion-proof valve 100 are low, resulting in minimal self-locking travel loss. This allows the valve to be fixed at its maximum opening state at any given time, ensuring exhaust efficiency. This high-opening pressure explosion-proof valve, suitable for high sealing performance, ensures both reliable sealing and adequate thermal safety for batteries.

[0105] An embodiment of the present application further provides a battery device, including a housing, a battery, and an explosion-proof valve 100 . The battery is disposed in the housing, the housing has an exhaust port, and the explosion-proof valve 100 is disposed at the exhaust port.

[0106] The specific structure, working principle and function of the explosion-proof valve 100 have been described in detail in the above embodiments and will not be repeated here.

[0107] In addition, an embodiment of the present application further provides an electrical device, including an electrical device and a battery device described in any of the above embodiments, wherein the battery device is used to provide electrical energy to the electrical device.

[0108] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0109] In addition, the electrical equipment may also be other equipment, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., wherein the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0110] 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof valve, characterized in that: include: An explosion-proof valve body (10), the explosion-proof valve body (10) having a through-hole (11) and a vent hole (15), the through-hole (11) and the vent hole (15) being arranged at intervals; A movable member (20), the movable member (20) comprising a valve cover (21) and a valve stem (22) connected to each other, the valve stem (22) being movably disposed through the through-hole (11) so that the valve cover (21) closes or opens the air vent (15); a limiting member (30), the limiting member (30) being arranged between the valve column (22) and the through-opening (11); The limiting member (30) is used to generate friction when the valve cover (21) moves toward the explosion-proof valve body (10), so as to limit the valve cover (21) from continuing to move toward the explosion-proof valve body (10).

2. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof valve body (10) is provided with a limiting groove (12), and the limiting groove (12) is communicated with the through-hole (11); the limiting member (30) is movably arranged in the limiting groove (12); The opening size of the limiting groove (12) gradually decreases along the direction from the valve cover (21) to the explosion-proof valve body (10), so that when the valve cover (21) moves toward the explosion-proof valve body (10), the limiting member (30) abuts against the valve column (22) and the groove wall of the limiting groove (12).

3. The explosion-proof valve according to claim 2, characterized in that: The cross section of the limiting member (30) is circular or gear-shaped, and the cross section is any plane passing through the center line of the through opening (11).

4. The explosion-proof valve according to claim 2, characterized in that: The limiting groove (12) is an annular groove or an arc groove.

5. The explosion-proof valve according to claim 4, characterized in that: The limiting member (30) is a circular ring, a sphere or a semicircular ring.

6. The explosion-proof valve according to claim 2, characterized in that: A plurality of the limiting grooves (12) are provided, and the plurality of limiting grooves (12) are arranged at intervals around the through opening (11).

7. The explosion-proof valve according to claim 2, characterized in that: In a cross section passing through the center line of the through opening (11), the maximum width of the limiting member (30) is greater than the minimum width of the limiting groove (12) on a side away from the valve cover (21), and is smaller than the maximum width of the limiting groove (12) on a side close to the valve cover (21).

8. The explosion-proof valve according to claim 2, characterized in that: Along the opening direction of the through opening (11), the maximum height of the limiting member (30) is less than the depth of the limiting groove (12).

9. The explosion-proof valve according to claim 2, characterized in that: The limiting groove (12) is semi-conical.

10. The explosion-proof valve according to claim 9, characterized in that: The limiting member (30) is a sphere, and the diameter of the limiting member (30) ranges from 2.5 mm to 3.0 mm; and / or, along the opening direction of the through opening (11), the depth of the limiting groove (12) ranges from 4.0 mm to 6.0 mm.

11. The explosion-proof valve according to claim 9, characterized in that: The limiting member (30) is a sphere, and the diameter range of the limiting member (30) is 2.5 mm to 3.0 mm, and / or the diameter range of the limiting groove (12) on the side close to the valve cover (21) is 5.0 mm to 6.0 mm, and / or the diameter range of the limiting groove (12) on the side away from the valve cover (21) is 1.0 mm to 1.5 mm.

12. The explosion-proof valve according to any one of claims 2 to 11, characterized in that: The surface of the limiting member (30) is a frosted surface.

13. The explosion-proof valve according to any one of claims 2 to 11, characterized in that: The explosion-proof valve body (10) is further provided with a stopper (13), and the stopper (13) is provided on a side of the limiting groove (12) close to the valve cover (21).

14. The explosion-proof valve according to any one of claims 1 to 11, characterized in that: The explosion-proof valve further comprises an elastic member (40), which is sleeved on the valve column (22) and located on a side of the explosion-proof valve body (10) away from the valve cover (21). The elastic member (40) is used to push the movable member (20) to move the valve cover (21) up and down to support the explosion-proof valve body (10).

15. The explosion-proof valve according to any one of claims 14, characterized in that: The movable member (20) further comprises a base (23), the base (23) being connected to a side of the valve column (22) away from the valve cover (21), one end of the elastic member (40) being supported on the explosion-proof valve body (10), and the other end being supported on the base (23).

16. The explosion-proof valve according to any one of claims 1 to 11, characterized in that: An inner sealing groove (14) is provided on a side of the explosion-proof valve body (10) facing the valve cover (21), and the inner sealing groove (14) is arranged around the air vent (15). The explosion-proof valve (100) further includes an inner sealing member (50), and the inner sealing member (50) is arranged in the inner sealing groove (14) to seal the valve cover (21) and the explosion-proof valve body (10).

17. The explosion-proof valve according to any one of claims 1 to 11, characterized in that: An outer sealing groove (16) is provided on a side of the explosion-proof valve body (10) away from the valve cover (21), and the outer sealing groove (16) is arranged around the air vent (15). The explosion-proof valve (100) further includes an outer sealing member (60), and the outer sealing member (60) is arranged in the outer sealing groove (16) to seal the explosion-proof valve body (10) and the housing of the battery device.

18. The explosion-proof valve according to any one of claims 1 to 11, characterized in that: There are a plurality of vent holes (15), and the plurality of vent holes (15) are arranged at intervals around the through opening (11).

19. A battery device, characterized in that: The invention comprises a shell, a battery and an explosion-proof valve (100) according to any one of claims 1 to 18, wherein the battery is arranged in the shell, the shell has an exhaust port, and the explosion-proof valve (100) is arranged at the exhaust port.

20. An electrical device, characterized in that: Comprising the battery device of claim 19.

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