Explosion-proof valve, battery and electric device

Abstract

The utility model discloses an anti-explosion valve, a battery and an electric device. The anti-explosion valve comprises a valve seat, a piston and a flange. The valve seat includes a valve bore. The piston can move relative to the valve seat in the axial direction of the valve seat so as to be attached to the valve seat to close the valve hole or away from the valve seat to form an axial gap between the piston and the valve seat to open the valve hole. The blocking edge is arranged on the circumferential edge of the piston. And when the valve hole is opened, the flange shields at least part of the axial gap in the circumferential direction, so that when the anti-explosion valve is opened to release gas, the gas is discharged through the part, which is not shielded by the flange, of the axial gap. The flange is arranged on the edge of the piston, so that when the explosion-proof valve is opened to release gas, at least partial area of the axial gap is shielded by the flange, and high-pressure gas can only be exhausted through the part which is not shielded by the flange, so that the high-pressure gas can be prevented from being directly exhausted to parts around the explosion-proof valve, the influence of the high-pressure gas on the parts is reduced, and the reliability of the explosion-proof valve is improved. And the use reliability and safety of the anti-explosion valve are improved.

Description

Technical Field

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

[0002] The temperature of the battery pack will change during the charging and discharging process, which will cause the air pressure inside the battery box to change. By setting an explosion-proof valve on the battery pack, the air pressure inside and outside the battery box can be balanced. 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 reliability of the explosion-proof valve.

[0004] The first aspect of the present application provides an explosion-proof valve, comprising a valve seat, a piston and a retaining edge. The valve seat comprises a valve hole. The piston can move relative to the valve seat in the axial direction of the valve seat to close the valve hole or move away from the valve seat to form an axial gap between the piston and the valve seat to open the valve hole. The retaining edge is arranged on the circumferential edge of the piston. When the valve hole is opened, the retaining edge blocks at least part of the axial gap in the circumferential direction, so that when the explosion-proof valve is opened to release gas, the gas is discharged through the part of the axial gap that is not blocked by the retaining edge.

[0005] By arranging a rib on the edge of the piston, when the explosion-proof valve is opened to release air, at least part of the axial gap is blocked by the rib, and the high-pressure gas can only be discharged through the part not blocked by the rib. In this way, the high-pressure gas can be reduced from being directly discharged to the parts around the explosion-proof valve, the impact of the high-pressure gas on the parts can be reduced, and the reliability and safety of the explosion-proof valve can be improved.

[0006] In some embodiments, the rib extends in a circumferential direction along an edge of the piston.

[0007] The rib is constructed to extend circumferentially along the edge of the piston, which can increase the shielding range of the rib on the axial gap, making the gas flow area more concentrated during exhaust, making it easier for the exhaust direction of high-pressure gas to bypass components and flow to other directions, thereby improving the reliability and safety of the explosion-proof valve.

[0008] In some embodiments, in the circumferential extension direction of the rib, the circumferentially spaced apart angle between the two circumferential ends of the rib is greater than 180°.

[0009] Such a setting can effectively reduce the direct blowing of high-pressure gas onto components, further improving the reliability and safety of the explosion-proof valve.

[0010] In some embodiments, the rib includes at least two rib segments. The at least two rib segments extend circumferentially along the edge of the piston, and the at least two rib segments are spaced apart in the circumferential direction.

[0011] The advantage of this setting is that when the gas is deflated, the flow direction of the high-pressure gas can be further refined according to the different distribution positions of the components around the explosion-proof valve, so that the explosion-proof valve has a certain reliability and safety in use in different application scenarios, thereby effectively improving the applicability of the explosion-proof valve.

[0012] In some embodiments, the valve seat includes a valve body and an annular convex edge. The valve hole is arranged radially inside the annular convex edge. During the axial movement of the piston relative to the valve seat, the retaining edge is located radially outside the annular convex edge.

[0013] By providing the annular convex edge, the piston can sink into the annular convex edge when closing the valve hole, thereby improving the air tightness in the closed state.

[0014] In some embodiments, the curvature of the annular convex edge is the same as that of the rib, and during the axial movement of the piston relative to the valve seat, the rib moves in contact with the circumferential outer surface of the annular convex edge.

[0015] Such an arrangement allows the rib to better fit with the outer surface of the annular convex edge, thereby improving the shielding effect of the rib on the axial gap when the explosion-proof valve is opened, and effectively concentrating the exhaust direction in a specific area.

[0016] In some embodiments, the piston includes a piston plate and an annular bend portion arranged at the edge of the piston plate. The annular bend portion includes a first annular extension section and a second annular extension section. The first annular extension section is arranged at the edge of the piston plate and extends in the axial direction away from the valve seat. The second annular extension section is connected to the end of the extension direction of the first annular extension section and extends radially outward from the piston plate. The rib is connected to the radial outer end of the second annular extension section and extends axially toward the valve seat. The piston plate, the first annular extension section, the second annular extension section and the rib are enclosed to form an annular groove. The annular groove is used to cooperate with the annular convex edge when the explosion-proof valve is in a closed state.

[0017] By forming the annular groove, the sinking degree of the piston plate in the annular convex edge can be increased when the piston closes the valve hole, thereby further improving the air tightness of the explosion-proof valve in the closed state.

[0018] In some embodiments, the rib extends axially toward the valve seat. When the piston moves to a maximum stroke relative to the valve seat, the rib covers at least a portion of the annular convex edge in the axial direction, so that the rib blocks at least a portion of the axial gap in the circumferential direction.

[0019] In this way, it can be ensured that the entire circumference of the axial gap is in a closed state in the area where the ribs are provided, and the high-pressure gas can only be discharged through the area where the ribs are not provided, thereby improving the reliability and safety of the explosion-proof valve.

[0020] A second aspect of the present application provides a battery, comprising a battery box, a battery cell and the explosion-proof valve as described above, wherein the battery cell is arranged in the battery box and the explosion-proof valve is arranged on the battery box.

[0021] The third aspect of the present application provides an electrical device, comprising the battery as described above. The battery is used to provide electrical energy.

[0022] 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

[0023] 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.

[0024] Figure 1 It is a schematic diagram of the structure of a vehicle according to some embodiments of the present application.

[0025] Figure 2 It is a schematic diagram of the exploded structure of the battery of some embodiments of the present application.

[0026] Figure 3 It is a schematic diagram of the exploded view of the explosion-proof valve of some embodiments of the present application.

[0027] Figure 4 Schematic diagram of the valve seat portion of the explosion-proof valve according to some embodiments of the present application.

[0028] Figure 5 It is a schematic diagram of the explosion-proof valve in an open state according to some embodiments of the present application.

[0029] Figure 6 It is a schematic diagram of the explosion-proof valve in a closed state according to some embodiments of the present application.

[0030] Figure 7 It is a cross-sectional view of the explosion-proof valve in some embodiments of the present application in a closed state.

[0031] Figure numbers: vehicle 2000, battery 1000, battery box 200, lower box body 210, upper box body 220, battery module 100, piston 1, piston plate 11, annular bending portion 12, first annular extension section 121, second annular extension section 122, magnet sheet 2, inner sealing ring 3, valve seat 4, valve body 41, annular flange 42, valve hole 43, mounting through hole 44, guide hole 45, spring 5, guide rod 6, sleeve 7, outer sealing ring 8, rib 9, axial gap A, annular groove B. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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).

[0037] 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.

[0038] 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.

[0039] At present, from the perspective of market development, 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 cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0040] 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.

[0041] 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 2In 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.

[0042] The explosion-proof valve is installed on the battery box to release the internal pressure of the battery box when the pressure inside the battery box exceeds the threshold, thereby reducing the risk of battery explosion or combustion and improving the stability of the battery operation process. The applicant of this application found that in the related art, there are many other components near the battery box (for example, cables, wiring harnesses or fuel tanks, etc.). When the explosion-proof valve releases high-pressure gas, the high-pressure gas leaks from the vent hole of the explosion-proof valve to the surroundings. These high-pressure gases will affect the reliability of the surrounding components due to their high temperature, which poses a certain risk. If the structure of the explosion-proof valve can be improved so that when the explosion-proof valve is deflated, the release of high-temperature and high-pressure gas only occurs in a local area, the surrounding components can be better protected, and safety and reliability can be improved.

[0043] Therefore, if the flow direction of the gas when the explosion-proof valve is deflated can be restricted to avoid the opponent parts around the explosion-proof valve, the safety and reliability of the explosion-proof valve can be greatly improved.

[0044] refer to Figures 3 to 5 Some embodiments of the present application provide an explosion-proof valve, comprising a valve seat 4, a piston 1 and a rib 9. The valve seat 4 comprises a valve hole 43. The piston 1 can move relative to the valve seat 4 along the axial direction of the valve seat 4 to close the valve hole 43 or move away from the valve seat 4 to form an axial gap A between the piston 1 and the valve seat 4 to open the valve hole 43. The rib 9 is arranged on the circumferential edge of the piston 1. When the valve hole 43 is opened, the rib 9 blocks at least part of the axial gap A in the circumferential direction, so that when the explosion-proof valve is opened to release gas, the gas is discharged through the part of the axial gap A that is not blocked by the rib 9.

[0045] Specifically, the explosion-proof valve has two states: closed and open. In the closed state, the piston 1 is tightly covered on the valve seat 4, so that the valve hole 43 is closed and the internal space of the battery box is not connected to the outside. When the battery box has thermal runaway, the pressure in the battery box increases, and the high-pressure gas acts on the piston 1, forcing the piston 1 to move axially away from the valve seat 4, so that the valve hole 43 is opened. At this time, the internal space of the battery box is connected to the outside, and the high-pressure gas is discharged to the outside through the valve hole 43.

[0046] Furthermore, when the piston 1 is axially away from the valve seat 4, an axial gap A is formed between the piston 1 and the valve seat 4. If the rib 9 is not provided, the high-pressure gas will pass through the axial gap A and be discharged in the entire circumferential direction. The high-temperature and high-pressure gas will affect the components around the explosion-proof valve, which is not conducive to the stability and safety of the system.

[0047] By providing a rib 9 on the edge of the piston 1, when the explosion-proof valve is opened to release air, at least part of the axial gap A is blocked by the rib 9, and the high-pressure gas can only be discharged through the part not blocked by the rib 9. In this way, the high-pressure gas can be reduced from being directly discharged to the parts around the explosion-proof valve, the impact of the high-pressure gas on the parts can be reduced, and the reliability and safety of the explosion-proof valve can be improved.

[0048] In addition, this can also reduce damage to components around the explosion-proof valve, thereby reducing maintenance and replacement costs and improving the overall stability and reliability of the equipment.

[0049] refer to Figure 5 In some embodiments, the rib 9 extends in the circumferential direction along the edge of the piston 1 .

[0050] Specifically, the rib 9 is constructed to extend circumferentially along the edge of the piston 1, which can increase the shielding range of the rib 9 on the axial gap A, making the gas flow area more concentrated during exhaust, making it easier for the exhaust direction of the high-pressure gas to bypass components and flow to other directions, thereby improving the reliability and safety of the explosion-proof valve.

[0051] In order to further improve the reliability and safety of the explosion-proof valve, in some embodiments, in the circumferential extension direction of the rib 9, the circumferential angle between the two circumferential ends of the rib 9 is greater than 180°. This arrangement can effectively reduce the high-pressure gas from blowing directly onto the components.

[0052] It can be understood that the flanges 9 in the above embodiments are all continuously extended structures, so that the axial gap A can be divided into two sections in the entire circumferential direction, namely a ventilation section and a non-ventilation section. The boundary between the ventilation section and the non-ventilation section is formed by the circumferential end of the flange 9. If the circumferential ends of the flange 9 are 200° apart in the circumferential direction, the circumferential span of the non-ventilation section is 200°, and the circumferential span of the ventilation section is 160°.

[0053] In some embodiments, the rib includes at least two rib segments. The at least two rib segments extend circumferentially along the edge of the piston 1, and the at least two rib segments are spaced apart in the circumferential direction.

[0054] In this embodiment, at least two flange segments divide the axial gap A into at least two ventilation segments and at least two non-ventilation segments in the entire circumference, and the at least two ventilation segments and at least two non-ventilation segments are alternately distributed. For example, in an embodiment in which the flange includes two flange segments, the axial gap A is divided into a first ventilation segment, a first non-ventilation segment, a second ventilation segment, and a second non-ventilation segment in the entire circumference. The advantage of such a setting is that when the gas is deflated, the flow direction of the high-pressure gas can be further refined according to the different distribution positions of the components around the explosion-proof valve, so that the explosion-proof valve has a certain reliability and safety in use in different application scenarios, thereby effectively improving the applicability of the explosion-proof valve.

[0055] In some embodiments, reference Figure 4 The valve seat 4 includes a valve body 41 and an annular convex edge 42. The valve hole 43 is arranged radially inside the annular convex edge 42. During the axial movement of the piston 1 relative to the valve seat 4, the rib 9 is located radially outside the annular convex edge 42.

[0056] The end face of the valve body 41 facing the piston 1 is defined as the upper end face, and the end face facing away from the piston 1 is defined as the lower end face. The annular convex edge 42 is provided on the upper end face of the valve body 41, and the annular convex edge 42 protrudes in a direction perpendicular to the upper end face of the valve body 41. The annular convex edge 42 defines a circular area on the upper end face of the valve body 41, and the valve hole 43 is distributed circumferentially along the edge of the circular area and penetrates the valve body 41 in the thickness direction, which is conducive to increasing the flow area of ​​the valve hole 43 when exhausting.

[0057] On the other hand, by providing the annular convex edge 42 , the piston 1 can sink into the annular convex edge 42 when closing the valve hole 43 , thereby improving the air tightness in the closed state.

[0058] In some embodiments, the valve hole 43 includes a plurality of hole segments that are non-continuously arranged in the circumferential direction. In other words, there is an interval between two circumferentially adjacent hole segments, and the plurality of hole segments are evenly spaced and distributed in the entire circumferential direction, so that the flow area of ​​the valve hole 43 during exhaust can be guaranteed, and the structural strength of the valve body 41 can be guaranteed. It should be understood that if the rib 9 is set at a non-edge of the piston 1, the rib 9 will not be able to extend to any length in the circumferential direction, because it will be blocked by the portion of the valve body 41 in the circular area where the hole segment is not opened. The explosion-proof valve in each embodiment of the present application takes this into consideration, and the rib 9 is set at the edge of the piston 1, so that the rib 9 is located radially outside the annular convex edge, so that the rib 9 can be set to extend to different lengths along the edge of the piston 1 according to actual needs, without interfering with the valve body 41 in structure.

[0059] refer to Figure 4 In some embodiments, the valve hole 43 includes four hole segments, and the four hole segments are distributed at intervals in the circumferential direction.

[0060] In some embodiments, the annular protrusion 42 has the same curvature as the rib 9 , and during the axial movement of the piston 1 relative to the valve seat 4 , the rib 9 moves in contact with the circumferential outer surface of the annular protrusion 42 .

[0061] Such an arrangement allows the rib 9 to better fit the outer surface of the annular convex edge 42, thereby improving the shielding effect of the rib 9 on the axial gap A when the explosion-proof valve is opened, and effectively concentrating the exhaust direction in a specific area.

[0062] In order to improve the sealing performance of the piston when closing the valve hole 43 and reduce the interference of the annular convex edge on the piston 1 during the process of closing the valve hole 43, refer to Figure 7 In some embodiments, the piston 1 includes a piston plate 11 and an annular bent portion 12 disposed at the edge of the piston plate 11. The annular bent portion 12 includes a first annular extension section 121 and a second annular extension section 122. The first annular extension section 121 is disposed at the edge of the piston plate 11 and extends in the axial direction away from the valve seat 4. The second annular extension section 122 is connected to the end of the extension direction of the first annular extension section 121 and extends radially outward from the piston plate 11. The retaining edge 9 is connected to the radial outer end of the second annular extension section 122 and extends in the axial direction toward the valve seat 4. The piston plate 11, the first annular extension section 121, the second annular extension section 122 and the retaining edge 9 enclose an annular groove B. The annular groove B is used to fit concavely and convexly with the annular convex edge 42 when the explosion-proof valve is in a closed state.

[0063] Specifically, the edge of the piston plate 11 and the first annular extension section 121 form the inner wall of the annular groove B, the rib 9 forms the outer wall of the annular groove B, and the second annular extension section 122 forms the bottom wall of the annular groove B. By forming the annular groove B, when the piston 1 closes the valve hole 43, the degree of sinking of the piston plate 11 in the annular convex edge 42 can be increased, thereby further improving the air tightness of the explosion-proof valve in the closed state.

[0064] In some embodiments, when the piston 1 moves to a maximum stroke relative to the valve seat 4 , the rib 9 covers at least a portion of the annular protrusion 42 in the axial direction, so that the rib 9 blocks at least a portion of the axial gap A in the circumferential direction.

[0065] Specifically, as the piston 1 gradually moves to its maximum stroke, the distance between the piston 1 and the valve seat 4 gradually increases, causing the axial clearance A to gradually increase. When the axial clearance A is at its maximum, the rib 9 still covers at least a portion of the annular convex edge 42, thereby ensuring that the entire circumference of the axial clearance A is in a closed state in the area where the rib 9 is provided, and high-pressure gas can only be discharged through the area where the rib 9 is not provided, thereby improving the reliability and safety of the explosion-proof valve.

[0066] refer to Figure 3 In some embodiments, the explosion-proof valve further includes a magnet sheet 2 and an inner sealing ring 3, wherein the inner sealing ring 3 is disposed in a circular area defined by an annular convex edge 42, and is used to improve the sealing performance of the explosion-proof valve when it is closed. The magnet sheet 2 is used to cooperate with the valve body 41 to cover a waterproof and breathable membrane (not shown in the figure) disposed on the valve body 41 by magnetic force.

[0067] refer to Figure 3 In some embodiments, the explosion-proof valve further includes a guide rod 6 and a spring 5. The first end of the guide rod 6 has an annular step, the second end of the guide rod 6 is fixedly connected to the piston plate 11, the spring 5 is sleeved on the outer surface of the guide rod 6, and the first end of the spring 5 abuts against the annular step, and the second end of the spring 5 abuts against the lower end surface of the valve body 41. The valve seat 4 also includes a mounting through hole 44 and a guide hole 45. The mounting through hole 44 is arranged at the edge of the valve body 41 and passes through the valve body 41. The valve body 41 is connected to the battery box 200 through the mounting through hole 44. The guide hole 45 is arranged at the center of the circular area defined by the annular convex edge 42, and the guide hole 45 passes through the valve body 41. The guide rod 6 is installed in the guide hole 45 and is axially movable through the guide hole 45. When thermal runaway occurs in the battery box 200, the high-pressure gas acts on the first end of the guide rod 6. As the pressure in the battery box 200 continues to increase, the pressure eventually reaches a threshold value, and the guide rod 6 moves axially and drives the piston plate 11 axially away from the valve seat 4 to open the valve hole 43. At this time, the spring 5 is squeezed. As the high-pressure gas leaks, the pressure in the battery box 200 gradually decreases until it is less than the elastic force of the spring 5. At this time, the spring 5 resets and drives the guide rod 6 to move axially, thereby causing the piston plate 11 to move toward the valve seat 4 and sink into the annular convex edge 42 to close the valve hole 43.

[0068] refer to Figure 3 In some embodiments, the explosion-proof valve further includes a sheath 7, which is constructed as a hollow tubular structure. The sheath 7 is sleeved on the outer side of the portion of the guide rod 6 extending from the guide hole 45 toward the lower end surface of the valve body 41. The first end of the sheath 7 is used to connect with the battery box 200, and the second end of the sheath 7 is connected to the lower end surface of the valve body 41. A connecting hole is provided on the end surface of the first end of the sheath 7. The internal space of the sheath 7 is connected to the internal gas of the battery box 200 through the connecting hole, so that when the internal air pressure of the battery box 200 changes, the air pressure in the sheath 7 can also change synchronously, so that the guide rod 6 can move in the sheath 7 with the change of air pressure, and the setting of the sheath 7 also defines a path for the movement of the guide rod 6.

[0069] refer to Figure 3In some embodiments, the explosion-proof valve further includes an outer sealing ring 8, which is disposed on the lower end surface of the valve body 41. After the explosion-proof valve is installed on the battery box 200, the outer sealing ring 8 is clamped between the valve body 41 and the surface of the battery box 200, thereby reducing the gap between the valve body 41 and the battery box 200, improving the sealing performance of the explosion-proof valve, and ensuring that the high-pressure gas is discharged through the exhaust port as much as possible during gas leakage, and also ensuring the sensitivity of the explosion-proof valve to be opened or closed.

[0070] Some embodiments of the present application further provide a battery, including a battery box 200 , a battery cell, and the explosion-proof valve as described above, wherein the battery cell is disposed in the battery box 200 , and the explosion-proof valve is disposed on the battery box 200 .

[0071] The present application also provides an electrical device, comprising the battery 1000 as described above, wherein the battery 1000 is used to provide electrical energy.

[0072] Combine the following Figures 3 to 7 , an explosion-proof valve of a specific embodiment of the present application is described in detail.

[0073] The explosion-proof valve comprises a piston 1, a magnet sheet 2, an inner sealing ring 3, a valve seat 4, a spring 5, a guide rod 6, a sheath 7, an outer sealing ring 8 and a rib 9.

[0074] The piston 1 includes a piston plate 11 and an annular bent portion 12 arranged at the edge of the piston plate 11. The annular bent portion 12 includes a first annular extension section 121 and a second annular extension section 122. The first annular extension section 121 is arranged at the edge of the piston plate 11 and extends in the axial direction away from the valve seat 4. The second annular extension section 122 is connected to the end of the extension direction of the first annular extension section 121 and extends toward the radial outside of the piston plate 11. The rib 9 is connected to the radial outer end of the second annular extension section 122 and extends in the axial direction toward the valve seat 4. The piston plate 11, the first annular extension section 121, the second annular extension section 122 and the rib 9 enclose an annular groove B.

[0075] The valve seat 4 includes a valve body 41, an annular convex edge 42, a valve hole 43, a mounting through hole 44 and a guide hole 45. The annular convex edge 42 defines a circular area on the upper end surface of the valve body 41, and the valve hole 43 is arranged inside the circular area. The valve hole 43 includes four hole segments that are distributed circumferentially along the edge of the circular area and penetrate the valve body 41 in the thickness direction. The intervals between the four hole segments, or the areas of the circular area that are not penetrated by the hole segments, form a cross connection. The guide hole 45 is arranged at the center of the cross connection. The guide rod 6 is arranged in the guide hole 45 and can move axially through the guide hole 45. The first end of the guide rod 6 has an annular step, and the second end of the guide rod 6 is connected to the piston plate 11. The spring 5 is fixedly connected, and is sleeved on the outer surface of the guide rod 6, and the first end of the spring 5 abuts against the annular step, and the second end of the spring 5 abuts against the lower end surface of the valve body 41. When the pressure in the battery box reaches a threshold value, the high-pressure gas acts on the first end of the guide rod 6 and pushes the guide rod 6 to drive the piston plate 11 to move away from the valve seat 4 to open the valve hole 43. At this time, the spring 5 is compressed. When the high-pressure gas is discharged, the pressure in the battery box drops below the threshold value. Under the action of the elastic force of the spring 5, the guide rod 6 drives the piston plate 11 to reset and re-close the valve hole 43. The sheath 7 is sleeved on the outer side of the portion of the guide rod 6 extending from the guide hole 45 toward the lower end surface of the valve body 41. The first end of the sheath 7 is used to connect with the battery box 200, and the second end of the sheath 7 is connected to the lower end surface of the valve body 41. A connecting hole is provided on the end surface of the first end of the sheath 7. The internal space of the sheath 7 is connected with the internal gas of the battery box 200 through the connecting hole, so that when the internal air pressure of the battery box 200 changes, the air pressure in the sheath 7 can also change synchronously, so that the guide rod 6 can move in the sheath 7 with the change of air pressure.

[0076] In the above process, the rib 9 is always located radially outside the annular convex edge 42. When the piston 1 closes the valve hole 43, the piston plate 11 sinks into the annular convex edge 42, and the end of the annular convex edge 42 is concavely matched with the annular groove B. When the piston 1 opens the valve hole 43, the rib 9 moves in accordance with the outer surface of the annular convex edge 42, and when the piston 1 moves to the maximum stroke relative to the valve seat 4, the end of the rib 9 in the extension direction coincides axially with the annular convex edge 42, thereby blocking at least part of the area of ​​the axial gap A in the circumferential direction of the axial gap A, so that the high-pressure gas is discharged only through the unblocked part of the axial gap A during exhaust.

[0077] Furthermore, the magnet sheet 2 and the inner sealing ring 3 are both located inside the annular region formed by the annular convex edge 42, and the inner sealing ring 3 is used to improve the sealing performance of the explosion-proof valve when it is closed. The magnet sheet 2 is used to cooperate with the valve body 41 to cover the waterproof and breathable membrane (not shown in the figure) set on the valve body 41 by magnetic force. The outer sealing ring 8 is provided on the lower end surface of the valve body 41. When the explosion-proof valve is installed on the battery box 200, the outer sealing ring 8 is sandwiched between the battery box 200 and the lower end surface of the valve body 41.

[0078] 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: include: A valve seat (4), including a valve hole (43); A piston (1) is movable relative to the valve seat (4) along the axial direction of the valve seat (4) to be close to the valve seat (4) to close the valve hole (43) or to be away from the valve seat (4) to form an axial gap (A) between the piston (1) and the valve seat (4) to open the valve hole (43); and A rib (9) is arranged on the circumferential edge of the piston (1); when the valve hole (43) is opened, the rib (9) blocks at least a portion of the axial gap (A) in the circumferential direction, so that when the explosion-proof valve is opened to release gas, gas is discharged through the portion of the axial gap (A) that is not blocked by the rib (9).

2. The explosion-proof valve according to claim 1, characterized in that: The rib (9) extends in a circumferential direction along the edge of the piston (1).

3. The explosion-proof valve according to claim 2, characterized in that: In the circumferential extension direction of the rib (9), the circumferentially spaced angle between the two circumferential ends of the rib (9) is greater than 180°.

4. The explosion-proof valve according to claim 1, characterized in that: The rib includes at least two rib segments, the at least two rib segments extend circumferentially along the edge of the piston, and the at least two rib segments are spaced apart in the circumferential direction.

5. The explosion-proof valve according to claim 1, characterized in that: The valve seat (4) comprises a valve body (41) and an annular convex edge (42); the valve hole (43) is arranged radially inside the annular convex edge (42); and during the axial movement of the piston (1) relative to the valve seat (4), the retaining edge (9) is located radially outside the annular convex edge (42).

6. The explosion-proof valve according to claim 5, characterized in that: The annular convex edge (42) and the retaining edge (9) have the same curvature, and during the axial movement of the piston (1) relative to the valve seat (4), the retaining edge (9) moves in contact with the circumferential outer surface of the annular convex edge (42).

7. The explosion-proof valve according to claim 5, characterized in that: The piston (1) comprises a piston plate (11) and an annular bent portion (12) arranged at the edge of the piston plate (11); the annular bent portion (12) comprises a first annular extension section (121) and a second annular extension section (122); the first annular extension section (121) is arranged at the edge of the piston plate (11) and extends in an axial direction away from the valve seat (4); the second annular extension section (122) is connected to the end of the first annular extension section (121) in the extension direction and extends radially outward of the piston plate (11); the retaining edge (9) is connected to the radial outer end of the second annular extension section (122) and extends in an axial direction close to the valve seat (4); the piston plate (11), the first annular extension section (121), the second annular extension section (122) and the retaining edge (9) enclose an annular groove (B); the annular groove (B) is used to engage with the annular convex edge (42) in a concave-convex manner when the explosion-proof valve is in a closed state.

8. The explosion-proof valve according to claim 5, characterized in that: The rib (9) extends in the axial direction toward the valve seat (4); when the piston (1) moves to a maximum stroke relative to the valve seat (4), the rib (9) covers at least a portion of the annular convex edge (42) in the axial direction, so that the rib (9) blocks at least a portion of the axial gap (A) in the circumferential direction.

9. 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 8, wherein the battery cell is arranged in the battery box (200), and the explosion-proof valve is arranged on the battery box (200).

10. An electrical device, characterized in that: The battery (1000) according to claim 9 is used to provide electrical energy.

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