Explosion-proof valve, battery and electric device

Abstract

The utility model provides an anti-explosion valve, a battery and an electric device. The anti-explosion valve comprises a valve seat, a valve cover and a clamping piece. The valve seat has a valve hole. The valve cover is movably arranged relative to the valve seat in the axial direction of the valve hole so as to open or close the valve hole. The first end of the clamping piece is rotatably connected with the valve cover, and when the valve cover moves to the position where the valve hole is opened, the second end of the clamping piece is arranged to be connected with the valve seat in a clamped mode so that the valve cover can be kept at the position where the valve hole is opened. According to the explosion-proof valve, the second end of the clamping piece is clamped with the valve seat, so that the clamping piece limits the downward movement of the valve cover, and after the valve cover moves upwards to open the valve hole, the valve cover is kept at the position for opening the valve hole, so that high-temperature gas in the battery box is continuously exhausted, and even if the air pressure in the battery box is smaller than the external air pressure, the explosion-proof effect is good. When the explosion-proof valve is opened, the explosion-proof valve can still be kept in an open state, and high-temperature gas in the battery box can be continuously discharged through the opened passage, so that greater danger caused by secondary combustion is prevented, and the use safety of the battery is improved.

Description

Technical Field

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

[0002] With the continuous development of new energy, batteries are widely used in vehicles to provide electric drive for vehicles. How to improve the safety of battery use is an urgent problem to be solved. Utility Model Content

[0003] In view of the above problems, the present application provides an explosion-proof valve, a battery and an electrical device to improve the safety of battery use.

[0004] In a first aspect, the present application provides an explosion-proof valve including a valve seat, a valve cover and a stopper. The valve seat has a valve hole. The valve cover is movably arranged relative to the valve seat along the axial direction of the valve hole to open or close the valve hole. The first end of the stopper is rotatably connected to the valve cover, and when the valve cover moves to a position to open the valve hole, the second end of the stopper is configured to engage with the valve seat to keep the valve cover in the position to open the valve hole.

[0005] The explosion-proof valve in the embodiment of the present application is achieved by engaging the second end of the locking member with the valve seat, so that the locking member forms a limit on the downward movement of the valve cover. Therefore, when the valve cover moves upward to open the valve hole, the valve cover can remain in the position of opening the valve hole, thereby allowing the high-temperature gas inside the battery box to be continuously discharged. Even if the air pressure inside the battery box is lower than the external air pressure, the explosion-proof valve can still remain in the open state, and the high-temperature gas inside the battery box can also be continuously discharged through the open passage, thereby preventing secondary combustion from causing greater danger and improving the safety of battery use.

[0006] In some embodiments, the explosion-proof valve also includes a first magnet arranged at the second end of the locking member and a second magnet arranged on the valve seat. The magnetic properties of the second magnet are opposite to those of the first magnet. When the valve cover moves in the axial direction to open the valve hole, the first end of the locking member moves with the valve cover, and the second end of the locking member maintains contact with the valve seat under the action of the suction force of the second magnet and the first magnet to achieve locking.

[0007] The second end of the retaining member is provided with a first magnet. The valve seat is provided with a second magnet. The first magnet and the second magnet have opposite magnetic properties, so that the second magnet will continuously attract the first magnet, thereby making the second end of the retaining member continuously maintain contact with the valve seat during the radial movement, thereby achieving a retaining connection with the valve seat.

[0008] In some embodiments, when the valve cover moves in the axial direction to open the valve hole, the first end of the retaining member moves along the axial direction with the valve cover, the second end of the retaining member moves in the radial direction, and the second magnet extends in the radial direction.

[0009] When the first end of the retaining member moves upward with the valve cover, the second end of the retaining member moves radially. Therefore, the second magnet is arranged to extend in the radial direction, so that the second end of the retaining member can maintain contact with the valve seat during the entire process of radial movement to achieve locking.

[0010] In some embodiments, the stopper includes a stopper rod, and a length of the stopper rod is configured to be greater than a displacement stroke of the valve cover from a position closing the valve hole to a position opening the valve hole.

[0011] When the explosion-proof valve is in the open state, the locking rod, the valve seat and the valve cover form a right triangle layout. Because the length of the locking rod is set to be greater than the displacement stroke of the valve cover from the closed state to the open state, the locking rod can be prevented from separating from the valve seat.

[0012] In some embodiments, the valve seat includes a slot, and the second end of the retaining member is configured to be retained in the slot.

[0013] The second end of the locking member is locked by providing a locking groove, so that the locking member can be kept in an inclined state, thereby keeping the valve cover in an open state.

[0014] In some embodiments, the card slot includes a card-engaging surface and an inclined surface connected to the card-engaging surface. The card-engaging surface is a vertical surface parallel to the axial direction. The height of the inclined surface gradually increases from the radial outer side to the radial inner side.

[0015] In this way, when the second end of the stopper moves radially inward, the inclined surface will not catch the stopper, so that the stopper can smoothly move radially inward. When the valve cover reaches the position to open the valve hole, the second end of the stopper abuts against the clamping surface, thereby preventing the valve cover from falling off and closing the valve hole after the air pressure inside the battery box decreases, thereby preventing secondary combustion.

[0016] In some embodiments, the valve seat has a plurality of slots arranged in sequence in the radial direction. The second end of the stopper is configured to engage with one of the plurality of slots.

[0017] The valve seat has a plurality of clamping grooves arranged in sequence in the radial direction, so that clamping can be achieved at different positions of the clamping member moving along the radial direction, thereby further improving the safety of the explosion-proof valve in the embodiment of the present application.

[0018] In some embodiments, the valve seat includes a valve body, a guide cylinder and a connecting strip. The valve body has a valve hole, the guide cylinder is coaxially arranged in the valve hole, the valve cover includes a cover body and a guide rod arranged on a side of the cover body close to the valve seat, the guide rod is movably arranged in the guide cylinder, the connecting strip extends radially and connects the guide cylinder and the valve body, and the second end of the stopper is configured to be engaged with the connecting strip.

[0019] The guide rod cooperates with the guide cylinder to limit and guide the movement of the guide rod, so that the cover body can move along the axial direction, thereby ensuring the accuracy of the movement of the valve cover position.

[0020] In some embodiments, the explosion-proof valve further comprises an elastic element, a first end of the elastic element is connected to the valve seat, and a second end of the elastic element is connected to the valve cover and is configured to apply a force to the valve cover to approach the valve seat.

[0021] The explosion-proof valve of the embodiment of the present application is provided with an elastic element so that the valve cover can be stably maintained at a position closing the valve hole under normal working conditions.

[0022] In some embodiments, the explosion-proof valve further includes a sheath, which is connected to the valve seat and sleeved on the outside of the guide rod, and a vent hole is provided at the bottom of the sheath.

[0023] If the battery has thermal runaway, the internal high-pressure gas can act on the guide rod through the vent hole, so that the action position of the high-pressure gas can be more concentrated. In addition, by setting a sheath on the outside of the guide rod, the sheath protects and integrates the guide rod and the elastic element, thereby improving the integration of the entire explosion-proof valve.

[0024] The second aspect of the present application provides a battery, comprising a battery box, a battery cell and the above-mentioned explosion-proof valve. The explosion-proof valve is arranged on the battery box.

[0025] The third aspect of the present application provides an electrical device, comprising the above-mentioned battery. The battery is used to provide electrical energy.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of a vehicle according to some embodiments of the present application.

[0029] Figure 2 It is a schematic diagram of the exploded structure of the battery of some embodiments of the present application.

[0030] Figure 3It is a schematic diagram of the three-dimensional structure of the explosion-proof valve of some embodiments of the present application.

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the explosion-proof valve of some embodiments of the present application from another angle.

[0032] Figure 5 It is a schematic diagram of the exploded structure of the explosion-proof valve of some embodiments of the present application.

[0033] Figure 6 It is a schematic cross-sectional structure diagram of the explosion-proof valve in some embodiments of the present application in a closed state.

[0034] Figure 7 yes Figure 6 Schematic diagram of the local enlarged structure of part A.

[0035] Figure 8 Schematic diagram of the cross-sectional structure of the explosion-proof valve in some embodiments of the present application in an open state.

[0036] In the drawings, the drawings are not drawn to scale.

[0037] Vehicles 2000.

[0038] Battery 1000.

[0039] Battery box 200; lower box body 210; upper box body 220.

[0040] Battery module 100.

[0041] Explosion-proof valve 10.

[0042] Valve cover 1; cover body 11; guide rod 12.

[0043] Inner sealing ring 2.

[0044] The locking piece 3.

[0045] Valve seat 4; valve body 41; guide cylinder 42; connecting strip 43.

[0046] The second magnet 5 .

[0047] Elastic element 6.

[0048] The first magnet 7 .

[0049] Sheath 8; vent hole 81.

[0050] Outer sealing ring 9.

[0051] Valve hole 4A.

[0052] Card slot 4B; card surface 4B1; inclined surface 4B2. DETAILED DESCRIPTION

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0055] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] At present, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, its market demand is also growing.

[0061] The power-consuming device of the embodiment of the present application may be a mobile device such as a vehicle, a ship, a small aircraft, etc. Taking a vehicle as an example, the vehicle of the embodiment of the present application may be a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Figure 1 A vehicle 2000 using a battery 1000 as a power source is shown. The battery 1000 is disposed in the vehicle 2000. A drive motor is disposed in the vehicle 2000, the drive motor is electrically connected to the battery 1000, the battery 1000 provides electrical energy to the drive motor, and the drive motor is connected to the wheels through a transmission mechanism to drive the vehicle to move. Specifically, the battery 1000 can be horizontally disposed at the bottom of the vehicle 2000.

[0062] The battery 1000 of the embodiment of the present application includes at least one battery module 100. Specifically in this embodiment, Figure 2 As shown, the battery 1000 of this embodiment includes a battery module 100 and a battery box 200 for accommodating the battery module 100. The battery box 200 has a receiving cavity, and the battery module 100 is arranged in the receiving cavity. Figure 2 In the illustrated embodiment, the battery box 200 includes a lower box body 210 and an upper box body 220 that cover each other. The upper box body 220 and the lower box body 210 together define a storage space for accommodating the battery module 100. Of course, in some other embodiments, the battery 1000 may also include a cover body that covers the lower box body 210, and the cover body may be a plate-like structure, for example. Of course, the shape of the battery box 200 may be a variety of shapes, such as a cuboid, a cylinder, etc.

[0063] refer to Figure 3, a battery module includes multiple battery cells. Multiple battery cells are electrically connected through connecting plates. Multiple battery cells can be connected in series, in parallel, or in mixed connection under the connection of the connecting plates. Of course, the battery module is only used to describe the array formed by multiple battery cells. The battery module can be a battery module formed by connecting multiple battery cells in series, in parallel, or in mixed connection, and then multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole. Battery module can also refer to battery module.

[0064] A battery cell refers to the smallest unit that makes up a battery module. Battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc. The embodiments of the present application are not limited to this. A battery cell includes a housing, an end cap, an electrode assembly and other functional components. The housing is a component used to cooperate with the end cap to form an internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The housing and the end cap can be independent components, and an opening can be set on the housing, and the internal environment of the battery cell is formed by covering the opening with the end cap at the opening. The material of the housing can be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present disclosure do not impose any special restrictions on this.

[0065] The electrode assembly is a component in a battery cell where electrochemical reactions occur. One or more electrode assemblies may be contained in the housing. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole lugs connect the poles to form a current loop. The electrode assembly may be a winding structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0066] When the battery 1000 experiences thermal runaway, the pressure of the gas inside the battery box 200 is greater than the external force, and the explosion-proof valve opens under the pressure of the internal gas, thereby discharging the gas inside the battery to reduce the pressure inside the battery and prevent the battery from exploding. However, after the thermal runaway ends, the pressure of the gas inside the battery decreases, and the explosion-proof valve falls back and closes. However, there is still high-temperature gas inside the battery at this time, which may cause secondary combustion.

[0067] In order to solve the above problems, some embodiments of the present application provide an explosion-proof valve. The explosion-proof valve of some embodiments is provided with a stopper so that the valve cover can be kept in the position of opening the valve hole, so that even if there is still high-temperature gas in the battery box after thermal runaway occurs, the high-temperature gas can continue to be discharged through the open valve hole, thereby avoiding secondary combustion and improving the safety of battery use.

[0068] According to the following Figures 3 to 8The structure and working process of the explosion-proof valves in some embodiments of the present application are described in detail.

[0069] refer to Figures 3 to 8 The explosion-proof valve 10 of some embodiments of the present application includes a valve seat 4, a valve cover 1 and a stopper 3. The valve seat 4 has a valve hole 4A. The valve cover 1 is movably arranged along the axial direction of the valve hole 4A relative to the valve seat 4 to open or close the valve hole 4A. The first end of the stopper 3 is rotatably connected to the valve cover. When the valve cover 1 moves to a position where the valve hole is opened, the second end of the stopper 3 is configured to engage with the valve seat 4 to keep the valve cover 1 at the position where the valve hole is opened.

[0070] refer to Figure 3 In some embodiments, the explosion-proof valve 10 includes a valve seat 4 and a valve cover 1. The valve cover 1 is movably arranged relative to the valve seat 4 along the axial direction X of the valve hole 4A. In this way, when the cover body 11 of the valve cover 1 moves toward the direction close to the valve seat 4 ( Figure 1 When the cover 11 of the valve cover 1 moves away from the valve seat 4 ( Figure 1 When the cover 11 moves upward in the valve seat 4 to leave the valve seat 4 so that an axial gap is generated between the cover body 11 and the valve seat 4, the valve hole is opened, so that the explosion-proof valve 10 enters the open state.

[0071] refer to Figures 3 to 8 In some embodiments, the stopper 3 may be a stopper rod. The first end of the stopper 3 is rotatably connected to the valve cover 1. When the valve cover 1 moves upward to open the valve hole 4A, the first end of the stopper 3 moves upward. Since the connection is rotatable, the stopper 3 rotates around the first end. The second end of the stopper 3 moves in the radial direction and forms a locking connection with the locking groove 4B on the valve seat 4.

[0072] The explosion-proof valve 10 of the embodiment of the present application is achieved by engaging the second end of the locking member 3 with the valve seat 4, so that the locking member 3 forms a limit on the downward movement of the valve cover 1. Therefore, when the valve cover 1 moves upward to open the valve hole, the valve cover 1 can remain in the position of opening the valve hole, thereby allowing the high-temperature gas inside the battery box to be continuously discharged. Even if the air pressure inside the battery box is lower than the external air pressure, the explosion-proof valve 10 can still remain in the open state, and the high-temperature gas inside the battery box can also be continuously discharged through the opened passage, thereby preventing secondary combustion from causing greater danger and improving the safety of battery use.

[0073] It can be known from the above description that the first end of the retaining member 3 is connected to the valve cover 1, so when the valve cover 1 moves upward to open the valve hole, the first end of the retaining member 3 will also move upward with the valve cover 1, and the second end of the retaining member 3 will move along the radial direction of the valve seat 4. In order to prevent the second end of the retaining member 3 from being separated from the valve seat during the upward movement of the valve cover 1, that is, to ensure that the second end of the retaining member 3 can maintain contact with the valve seat 4 to achieve locking during the upward movement of the valve cover 1, refer to Figure 7 In some embodiments, the explosion-proof valve 10 further includes a first magnet 7 disposed at the second end of the retaining member 3 and a second magnet 5 disposed on the valve seat 4. The second magnet 5 has opposite magnetic properties to the first magnet 7. When the valve cover 1 moves in the axial direction to open the valve hole, the first end of the retaining member 3 moves with the valve cover 1, and the second end of the retaining member 3 maintains contact with the valve seat 4 under the action of the suction force of the second magnet 5 and the first magnet 7 to achieve a retaining connection.

[0074] like Figure 7 and Figure 8 As shown, the second end of the retaining member 3 is provided with a first magnet 7. The valve seat 4 is provided with a second magnet 5. The first magnet 7 and the second magnet 5 have opposite magnetic properties, so that the second magnet 5 will continue to attract the first magnet 7 during the radial movement, so that the second end of the retaining member 3 continues to maintain contact with the valve seat 4, thereby achieving a retaining connection with the valve seat 4.

[0075] like Figure 6 and Figure 7 As shown, the explosion-proof valve 10 is in a closed state, and the stopper 3 is placed flat on the valve seat 4. Figure 8 As shown, the explosion-proof valve 10 is in an open state, the first end of the retaining member 3 moves upward with the valve cover 1, and the second end of the retaining member 3 maintains contact with the valve seat 4 under the action of magnetic force, thereby making the retaining member 3 in an inclined state.

[0076] In some embodiments, the stopper 3 includes a stopper rod. The length of the stopper rod is greater than the displacement stroke of the valve cover 1 from the position of closing the valve hole to the position of opening the valve hole. Figure 8 As shown, when the explosion-proof valve 10 is in the open state, the stop rod, the valve seat 4 and the valve cover 1 form a right triangle layout. Because the length of the stop rod is set to be greater than the displacement stroke of the valve cover from the closed state to the open state, the stop rod can be prevented from being separated from the valve seat, so that the stop rod can be connected with the valve seat. In the embodiment of the present application, the first magnet 7 and the second magnet 5 are provided so that the second end of the stop rod can maintain stable contact with the valve seat.

[0077] That is to say, by making the length of the stop rod greater than the displacement stroke of the valve cover 1, the stop rod can maintain contact with the valve cover 1 throughout the entire displacement stroke of the valve cover 1. On this basis, the first magnet 7 and the second magnet 5 are further provided to prevent the stop rod from jumping off the valve seat during movement, thereby preventing the stop rod from being unable to be engaged.

[0078] In some embodiments, when the valve cover 1 moves in the axial direction to open the valve hole, the first end of the stopper 3 moves in the axial direction with the valve cover 1, and the second end of the stopper 3 moves in the radial direction. The second magnet 5 extends in the radial direction.

[0079] like Figure 4 As shown, in Figure 4 In the specific embodiment shown, the valve seat 4 includes a valve body 41, a guide cylinder 42 and at least two connecting strips 43. The valve body 41 has a valve hole 4A. The guide cylinder 42 is arranged in the valve hole 4A and is coaxially arranged with the valve hole 4A. The valve cover 1 includes a cover body 11 for covering and shielding the valve hole 4A and a guide rod 12 arranged on the lower side of the cover body 11. The guide rod 12 is arranged in the guide cylinder 42 and moves relative to the guide cylinder 42. The guide rod 12 is slidably matched with the guide cylinder 42 to guide the movement of the cover body 11. The connecting strip 43 extends radially and is used to connect the guide cylinder 42 and the valve body 41.

[0080] like Figures 6 to 8 As shown, the first end of the stopper 3 is rotatably connected to the guide rod 12 of the valve cover 1. The second end of the stopper 3 is configured to be engaged with the connecting strip 43 of the valve seat 4. When the first end of the stopper 3 moves upward with the valve cover 1, the second end of the stopper 3 moves radially. Therefore, the second magnet 5 is arranged to extend in the radial direction, so that the second end of the stopper 3 can maintain contact with the valve seat 4 throughout the entire process of moving in the radial direction, thereby achieving engagement.

[0081] Specifically, Figure 4 and Figure 7 As shown, the second magnet 5 is a bar-shaped block structure, which is arranged on the lower surface of the connecting bar 43.

[0082] The technical solution of the embodiment of the present application sets the second magnet 5 to extend in the radial direction, so that the second end of the locking member 3 can maintain contact with the valve seat 4 throughout the entire process of radial movement and can achieve locking at different radial positions.

[0083] In order to realize the clamping of the clamping member 3, in some embodiments, reference Figure 7 and Figure 8 The valve seat 4 includes a clamping groove 4B. The second end of the clamping member 3 is configured to be clamped in the clamping groove 4B.

[0084] The second end of the locking member 3 is locked by providing the locking groove 4B, so that the locking member 3 can be kept in a tilted state, thereby keeping the valve cover 1 in an open state.

[0085] In some embodiments, Figure 7 and Figure 8 As shown, the card slot 4B includes a card surface 4B1 and an inclined surface 4B2 connected to the card surface 4B1. The card surface 4B1 is a vertical surface parallel to the axial direction, and the height of the inclined surface 4B2 gradually increases from the radial outer side to the radial inner side.

[0086] like Figure 7 and Figure 8 As shown, during the process of switching the explosion-proof valve 10 from the closed state to the open state, the second end of the stopper 3 will move inward along the radial direction. During this movement, the slot 4B provided on the valve seat 4 needs to be constructed so as not to hinder the movement of the second end of the stopper 3 toward the radial inner side, and to be able to form a stopper on the second end of the stopper 3 after the valve cover 1 is opened. In order to achieve such an effect, the cross-sectional shape of the slot 4B in the embodiment of the present application is a right triangle. Among them, it includes a clamping surface 4B1 located on the radial outer side and an inclined surface 4B2 located on the radial inner side. And from the radial outer side to the radial inner side, the height of the inclined surface gradually increases. In this way, during the movement of the second end of the stopper 3 toward the radial inner side, the inclined surface will not clamp the stopper 3, thereby enabling the stopper 3 to move smoothly toward the radial inner side. When the valve cover 1 reaches the position of opening the valve hole, the second end of the stopper 3 abuts against the clamping surface 4B1, thereby preventing the valve cover 1 from falling off and closing the valve hole after the air pressure inside the battery box decreases, thereby preventing secondary combustion.

[0087] When thermal runaway occurs inside the battery and a large amount of high-temperature gas is generated, the gas pressure inside the battery is greater than that outside, and the valve cover of the explosion-proof valve 10 moves upward under the action of the gas pressure to open the valve hole. Under different gas pressures, the stroke of the valve cover moving upward is different, which makes the movement stroke of the first end of the stopper 3 different, and the movement stroke of the second end of the stopper 3 in the radial direction is also different. In order to enable the explosion-proof valve of the embodiment of the present application to maintain the open state under different strokes, that is, the second end of the stopper 3 can be connected with the valve seat 4 under different strokes, in some embodiments, the valve seat 4 has a plurality of slots 4B arranged in sequence in the radial direction. The second end of the stopper 3 is configured to be connected with one of the multiple slots 4B.

[0088] The valve seat 4 has a plurality of clamping grooves 4B arranged in sequence in the radial direction, so that clamping can be achieved at different positions of the clamping member 3 moving along the radial direction, thereby further improving the safety of the explosion-proof valve in the embodiment of the present application.

[0089] In some embodiments, the valve seat 4 includes a valve body 41 and a guide cylinder 42. The valve body 41 has a valve hole. The guide cylinder 42 is coaxially arranged in the valve hole. The valve cover 1 includes a cover body 11 and a guide rod 12 arranged on a side of the cover body 11 close to the valve seat. The guide rod 12 is movably arranged in the guide cylinder 42. The valve seat 4 also includes a connecting strip 43. The connecting strip 43 extends radially and connects the guide cylinder 42 and the valve body 41. The second end of the stopper 3 is configured to be engaged with the connecting strip 43.

[0090] The guide rod 12 cooperates with the guide cylinder 42 to limit and guide the movement of the guide rod 12. In this way, the movement of the cover body 11 can be along the axial direction, thereby ensuring the accuracy of the movement of the valve cover position.

[0091] In some embodiments, the explosion-proof valve further comprises an elastic element 6. A first end of the elastic element 6 is connected to the valve seat 4. A second end of the elastic element 6 is connected to the valve cover 1 and is configured to apply a force to the valve cover 1 to approach the valve seat 4.

[0092] like Figure 6 As shown, the valve cover 1 includes a cover body 11 and a guide rod 12 connected to the cover body 11. The first end of the elastic element 6 is connected to the valve seat 4, specifically, to the guide cylinder 42, and the second end of the elastic element 6 is connected to the lower end of the guide rod 12. In this way, when the battery is in normal working state, the elastic element 6 is in a compressed state, thereby applying a downward force to the guide rod 12, thereby making the cover body 11 tightly pressed against the valve seat 4 to close the valve hole. The elastic element 6 can specifically be a spring. The spring is sleeved on the outside of the guide rod 12. The elastic element 6 can also be other elastic elements.

[0093] The explosion-proof valve 10 of the embodiment of the present application is provided with an elastic element 6 so that the valve cover 1 can be stably maintained at a position of closing the valve hole under normal working conditions.

[0094] like Figure 4 As shown, in some embodiments, the explosion-proof valve 10 further includes a sheath 8. The sheath 8 is connected to the valve seat 4 and is sleeved on the outside of the guide rod 12. A vent hole 81 is provided at the bottom of the sheath 8.

[0095] The bottom of the sheath 8 is provided with a vent hole 81, and the top of the sheath 8 is connected to the valve seat 4, so that when the explosion-proof valve is installed on the battery box, if the battery has thermal runaway, the internal high-pressure gas can act on the guide rod 12 through the vent hole 81, so that the action position of the high-pressure gas can be more concentrated. In addition, by arranging the sheath 8 on the outside of the guide rod 12, the sheath 8 protects and integrates the guide rod 12 and the elastic element 6, thereby improving the integration of the entire explosion-proof valve.

[0096] Some other embodiments of the present application further provide a battery 1000 , including a battery box 200 , a battery cell, and an explosion-proof valve 10 . The explosion-proof valve 10 is disposed on the battery box 200 .

[0097] In some embodiments, the battery box 200 includes a plurality of walls. The explosion-proof valve 10 may be disposed on any of the plurality of walls. In some embodiments, the explosion-proof valve 10 is disposed on the top wall.

[0098] Some embodiments of the present application further provide an electrical device, including a battery 1000. The battery 1000 is used to provide electrical energy.

[0099] according to Figures 3 to 8 The structure of an explosion-proof valve according to a specific embodiment of the present application is described in detail.

[0100] like Figures 1 to 3 As shown, the explosion-proof valve of this embodiment includes a valve cover 1, an inner sealing ring 2, a stopper 3, a valve seat 4, a second magnet 5, an elastic element 6, a first magnet 7, a sheath 8 and an outer sealing ring 9.

[0101] like Figure 1 and Figure 2 As shown, the valve seat 4 includes a valve body 41, a guide cylinder 42 and at least two connecting strips 43. The valve body 41 has a valve hole and a mounting portion arranged outside the valve hole. The valve body 41 is installed on the battery box. The guide cylinder 42 is coaxially arranged on the inner side of the valve hole. The connecting strip 43 extends in the radial direction and connects the guide cylinder 42 and the valve body 41. At least two connecting strips 43 are evenly distributed in the circumferential direction.

[0102] like Figure 6 and Figure 7 As shown, the upper end surface of the valve body 41 is provided with a first annular groove, and the first annular groove is used to install the inner sealing ring 2. The lower end surface of the valve body 41 is provided with a second annular groove, and the second annular groove is used to install the outer sealing ring 9. When the explosion-proof valve is in a closed state, the cover body 11 of the valve cover 1 is covered on the upper end of the valve hole of the valve body 41 and is sealed through the inner sealing ring 2. After the explosion-proof valve is installed on the battery box, the lower end surface of the valve body 41 is sealed through the outer sealing ring 9.

[0103] like Figure 3 As shown, the valve cover 1 includes a cover body 11 and a guide rod 12. The cover body 11 is used to abut against the valve body 41 to cover the valve hole 4A and thus close the valve hole 4A. A connecting sleeve is provided at the lower end of the cover body 11. The guide rod 12 includes a guide rod body and a baffle plate provided at the lower end of the guide rod body. The guide rod body is threadedly connected to the connecting sleeve. The elastic element 6 is a spring, one end of which is connected to the baffle plate, and the other end of the spring is connected to the valve seat 4.

[0104] In normal working state, the elastic element 6 is in a compressed state, one end of the elastic element 6 presses against the guide rod 12, and the other end presses against the valve body 41, pressing the valve cover 1 tightly against the inner sealing ring 2 to perform a sealing function. When thermal runaway occurs in the battery, the high-pressure gas presses against the valve cover 1. When the pressure reaches the threshold, the valve cover 1 moves upward, and the elastic element 6 is further compressed, so that the valve hole is opened to achieve pressure relief.

[0105] like Figure 6 and Figure 7 As shown, the first end of the stopper 3 is rotatably connected to the guide rod 12. The second end of the stopper 3 is provided with a first magnet 7. The lower surface of the connecting strip 43 is provided with a second magnet 5. The second magnet 5 is attracted to the first magnet 7, so that when the guide rod 12 moves upward, the second end of the stopper 3 is stuck in the slot 4B on the connecting strip 43, thereby keeping the valve cover 1 in the open position.

[0106] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An explosion-proof valve, characterized in that: A valve seat (4) having a valve hole; A valve cover (1) is movably arranged relative to the valve seat (4) along the axial direction of the valve hole to open or close the valve hole; and A locking member (3), wherein a first end of the locking member (3) is rotatably connected to the valve cover (1), and when the valve cover (1) moves to a position for opening the valve hole, a second end of the locking member (3) is configured to engage with the valve seat (4) so ​​that the valve cover (1) is maintained at the position for opening the valve hole.

2. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof valve further comprises a first magnet (7) arranged at the second end of the retaining member (3) and a second magnet (5) arranged on the valve seat (4); the second magnet (5) has a magnetic property opposite to that of the first magnet (7); when the valve cover (1) moves along the axial direction to open the valve hole, the first end of the retaining member (3) moves with the valve cover (1); and the second end of the retaining member (3) maintains contact with the valve seat (4) under the action of the suction force of the second magnet (5) and the first magnet (7) to achieve retaining.

3. The explosion-proof valve according to claim 2, characterized in that: When the valve cover (1) moves along the axial direction to open the valve hole, the first end of the retaining member (3) moves along the axial direction with the valve cover (1), the second end of the retaining member (3) moves along the radial direction, and the second magnet (5) extends in the radial direction.

4. The explosion-proof valve according to claim 1, characterized in that: The locking member (3) comprises a locking rod, the length of which is configured to be greater than the displacement stroke of the valve cover (1) from a position closing the valve hole to a position opening the valve hole.

5. The explosion-proof valve according to claim 1, characterized in that: The valve seat (4) comprises a clamping groove (4B), and the second end of the clamping member (3) is configured to be clamped in the clamping groove (4B).

6. The explosion-proof valve according to claim 5, characterized in that: The clamping groove (4B) comprises a clamping surface and an inclined surface connected to the clamping surface, the clamping surface is a vertical surface parallel to the axial direction, and the height of the inclined surface gradually increases from the radial outer side to the radial inner side.

7. The explosion-proof valve according to claim 5, characterized in that: The valve seat (4) has a plurality of the clamping grooves (4B) arranged in sequence in the radial direction, and the second end of the clamping member (3) is configured to be clamped with one of the plurality of clamping grooves (4B).

8. The explosion-proof valve according to any one of claims 1 to 7, characterized in that: The valve seat (4) comprises a valve body (41), a guide cylinder (42) and a connecting strip (43); the valve body (41) has the valve hole; the guide cylinder (42) is coaxially arranged in the valve hole; the valve cover (1) comprises a cover body (11) and a guide rod (12) arranged on a side of the cover body (11) close to the valve seat; the guide rod (12) is movably arranged in the guide cylinder (42); the connecting strip (43) extends radially and connects the guide cylinder (42) and the valve body (41); and the second end of the locking member (3) is configured to be engaged with the connecting strip (43).

9. The explosion-proof valve according to claim 8, characterized in that: The explosion-proof valve further comprises an elastic element (6), a first end of the elastic element (6) being connected to the valve seat (4), and a second end of the elastic element (6) being connected to the valve cover (1) and being configured to apply a force to the valve cover (1) approaching the valve seat (4).

10. The explosion-proof valve according to claim 8, characterized in that: The explosion-proof valve further comprises a sheath (8), the sheath (8) being connected to the valve seat (4) and sleeved on the outside of the guide rod (12), and a vent hole (81) being provided at the bottom of the sheath (8).

11. A battery, characterized in that: It comprises a battery box (200), a battery cell, and an explosion-proof valve according to any one of claims 1 to 10, wherein the explosion-proof valve is arranged on the battery box (200).

12. An electrical device, characterized in that: The battery (1000) according to claim 11 is used to provide electrical energy.

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