Active controllable pressure relief explosion-proof breather valve

Abstract

The application discloses an actively controllable pressure relief explosion-proof breather valve, which comprises a valve body, a first diaphragm made of a breather material and a second diaphragm made of an elastic non-breather material, one end of the valve body is provided with an air inlet hole, the other end is provided with an air outlet hole, a flow guide hole and an explosion-proof hole are arranged in the valve body, the air outlet hole is provided with a valve cover, the valve cover is provided with a pressure relief hole which is connected with the air outlet hole and the outside, the first diaphragm covers the flow guide hole, the second diaphragm covers the explosion-proof hole, the valve cover is provided with a needle, and the valve body is further provided with an active explosion gas channel which is connected with the explosion-proof hole and located on the side of the second diaphragm away from the valve cover, the active explosion gas channel is used for supplying air into the explosion-proof hole when the battery pack is abnormal, so that the second diaphragm is deformed and poked by the needle. The above scheme adds the active explosion gas channel to the valve body, the active explosion gas channel actively supplies air into the explosion-proof hole when the battery pack is abnormal, so that the active pressure relief can be realized before the battery pack is predicted to be abnormal, and the safety of the battery pack is effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of explosion-proof vent valves, and more specifically to an active controllable pressure relief explosion-proof vent valve. Background Technology

[0002] As one of the three core components of new energy vehicles, ensuring the safety of the battery pack has always been a key research focus in the industry. Under normal operating conditions, the battery pack is in a sealed state. However, during normal operation, the temperature and pressure inside the battery pack will change with variations in temperature, air pressure, and altitude. To ensure the normal operation of the battery pack, a vent valve is usually added to its casing to balance the internal and external gas pressure. Due to the special nature of the battery pack, the vent valve must be both breathable and waterproof.

[0003] When a battery pack experiences thermal runaway due to an impact, short circuit, or other unexpected factors, the temperature of the internal cells may rise rapidly, releasing a large amount of gas, which can then affect surrounding cells, creating a chain reaction of thermal propagation. To ensure the safety of the battery pack, an explosion-proof valve is usually added to the battery pack casing. When the gas inside the battery pack expands and the pressure rises, the explosion-proof valve will automatically open to release pressure, thereby effectively preventing thermal propagation and battery pack explosion.

[0004] However, existing explosion-proof valves can only open to release pressure after the gas inside the battery pack has expanded to a certain extent, which is a passive pressure release. By this time, a violent reaction has already occurred inside the battery pack, meaning that the pressure release time of the explosion-proof valve is actually too late, and it is impossible to release pressure in advance when the thermal runaway of the battery pack is anticipated. Utility Model Content

[0005] The purpose of this invention is to solve the problem that when thermal runaway occurs inside the battery pack, the pressure relief time of the explosion-proof valve in the prior art is actually too late, and it is impossible to explode and relieve pressure in advance when the thermal runaway of the battery pack is predicted.

[0006] To address the aforementioned problems, this utility model provides an active, controllable pressure relief explosion-proof vent valve, comprising a valve body for installation in a battery pack, a first diaphragm made of a breathable material, and a second diaphragm made of an elastic, non-breathable material. One end of the valve body has an air inlet and the other end has an air outlet. The valve body has a guide hole connecting the air inlet and the air outlet, and an explosion-proof hole independent of the guide hole but connecting the air inlet and the air outlet. The air outlet has a valve cover with a pressure relief hole connecting the air outlet to the outside. The first diaphragm covers the guide hole. The outer periphery of the second diaphragm is connected to the explosion-proof hole to cover it. The valve cover has a needle facing the explosion-proof hole. The valve body also has an active rupture air passage connected to the explosion-proof hole and located on the side of the second diaphragm facing away from the valve cover. The active rupture air passage is used to supply air to the explosion-proof hole when the battery pack malfunctions, causing the second diaphragm to bulge and deform towards the valve cover and be punctured by the needle.

[0007] Compared with existing technologies, the above solution improves the structure of the explosion-proof valve by adding an active rupture air channel to the valve body. When the battery pack temperature or air pressure becomes abnormal, the active rupture air channel actively supplies air into the explosion-proof hole, causing the second diaphragm to bulge and deform against the valve cover and be punctured by the needle. This allows for active pressure relief before the battery pack is expected to malfunction, effectively improving the safety of the battery pack.

[0008] In an improved embodiment, the valve body includes an outer sleeve and an inner sleeve. The inner sleeve is connected to the inside of the outer sleeve to separate the two ends of the outer sleeve into an inlet and an outlet. The explosion-proof hole is axially opened in the inner sleeve. The flow guide hole is formed by the outer peripheral wall of the inner sleeve and the inner peripheral wall of the outer sleeve, thereby making the valve body compact and easy to manufacture. The annular flow guide hole has a large flow area, ensuring that the gas passes through the flow guide hole uniformly under normal conditions. The explosion-proof hole is axially opened in the inner sleeve to ensure that the second diaphragm has sufficient elastic deformation space.

[0009] In an improved embodiment, the active rupture air channels are multiple and distributed circumferentially along the valve body. All active rupture air channels are connected to the explosion-proof hole, thereby uniformly delivering gas to the explosion-proof hole through multiple air supply pipes, ensuring more stable bulging deformation of the second diaphragm.

[0010] In an improved embodiment, the valve body is provided with a gas supply pipe that connects to the active blasting gas channel, thereby supplying gas to the active blasting gas channel through the gas supply pipe.

[0011] In an improved embodiment, the first diaphragm is annular and fits against the end face of the inner sleeve near the air outlet to cover the guide hole, so that the gas entering through the air inlet can pass through the guide hole and then be discharged from the first diaphragm to the air outlet, ensuring a more stable airflow.

[0012] In an improved embodiment, the vent is provided with a first retaining ring that abuts against the first diaphragm on the side facing the valve cover, thereby axially limiting the first diaphragm through the first retaining ring.

[0013] In an improved embodiment, the inner sleeve is provided with a stepped protrusion at one end of the explosion-proof hole near the air inlet. The second diaphragm is attached to the stepped protrusion to cover the explosion-proof hole, thereby ensuring that the second diaphragm has sufficient space for bulging deformation relative to the valve cover, resulting in a more reasonable layout.

[0014] In an improved embodiment, the explosion-proof hole is provided with a second retaining ring that abuts against the second diaphragm on the side facing the valve cover, thereby axially limiting the second diaphragm through the second retaining ring. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an explosion-proof vent valve with active and controllable pressure relief. Figure 2 A bottom view schematic diagram of an explosion-proof vent valve with active and controllable pressure relief; Figure 3 For along Figure 2 Cross-sectional view of section AA in the middle; Figure 4 In order to be in Figure 3 A diagram of the gas supply pipe has been added to the existing diagram. Figure 5 This is a schematic diagram of an explosion-proof vent valve with active and controllable pressure relief, featuring an added air supply pipe.

[0016] Explanation of reference numerals in the attached figures. 1. Valve body; 101. Outer sleeve; 102. Inner sleeve; 11. Air inlet; 12. Air outlet; 13. Flow guide hole; 14. Explosion-proof hole; 141. Stepped boss; 2. First diaphragm; 3. Second diaphragm; 4. Valve cover; 41. Pressure relief hole; 42. Needle; 5. Active rupture air passage; 51. Air supply pipe; 61. First retaining ring; 62. Second retaining ring. Detailed Implementation

[0017] It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0018] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0019] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Please see Figures 1-3 An embodiment of this utility model provides an active controllable pressure relief explosion-proof vent valve, including a valve body 1 for installation on a battery pack, a first diaphragm 2 made of a breathable material, and a second diaphragm 3 made of an elastic non-breathable material. One end of the valve body 1 has an air inlet 11 and the other end has an air outlet 12. The valve body 1 has a guide hole 13 connecting the air inlet 11 and the air outlet 12, and an explosion-proof hole 14 independent of the guide hole 13 but connecting the air inlet 11 and the air outlet 12. The air outlet 12 is provided with a valve cover 4. 4 is provided with a pressure relief hole 41 that connects the vent 12 to the outside. The first diaphragm 2 is provided to cover the guide hole 13. The outer periphery of the second diaphragm 3 is connected to the explosion-proof hole 14 to cover the explosion-proof hole 14. The valve cover 4 is provided with a needle 42 facing the explosion-proof hole 14. The valve body 1 is also provided with an active rupture air passage 5 that connects to the explosion-proof hole 14 and is located on the side of the second diaphragm 3 facing away from the valve cover 4. The active rupture air passage 5 is used to supply air into the explosion-proof hole 14 when the battery pack is abnormal, so that the second diaphragm 3 bulges and deforms towards the valve cover 4 and is punctured by the needle 42.

[0022] Compared with the existing technology, the above solution improves the structure of the explosion-proof valve by adding an active rupture air channel 5 to the valve body 1. When the battery pack temperature, air pressure, etc. are abnormal, the active rupture air channel 5 actively supplies air into the explosion-proof hole 14, causing the second diaphragm 3 to bulge and deform against the valve cover 4 and be punctured by the needle 42. Thus, active pressure relief can be achieved before the battery pack is expected to malfunction, effectively improving the safety of the battery pack.

[0023] In this embodiment, the valve body 1 is designed to include an outer sleeve 101 and an inner sleeve 102. The inner sleeve 102 is connected to the inside of the outer sleeve 101 to separate the two ends of the outer sleeve 101 into an inlet port 11 and an outlet port 12. An explosion-proof hole 14 is axially formed inside the inner sleeve 102. A guide hole 13 is formed by the outer peripheral wall of the inner sleeve 102 and the inner peripheral wall of the outer sleeve 101, thereby making the valve body 1 compact and easy to manufacture. The annular guide hole 13 has a large flow area, ensuring that gas passes through the guide hole 13 uniformly under normal conditions. The explosion-proof hole 14 is axially formed inside the inner sleeve 102 to ensure that the second diaphragm 3 has sufficient elastic deformation space. Of course, the valve body 1 can also be other forms of explosion-proof valves in the prior art, and this design does not limit this.

[0024] In this embodiment, there are multiple active rupture air channels 5 distributed circumferentially along the valve body 1. Each active rupture air channel 5 is connected to the explosion-proof hole 14, thereby uniformly delivering gas to the explosion-proof hole 14 through multiple active rupture air channels 5, ensuring more stable bulging deformation of the second diaphragm 3. It should be understood that the active rupture air channel 5 connected to the explosion-proof hole 14 in this embodiment includes both direct connection of the active rupture air channel 5 to the explosion-proof hole 14 and indirect connection of the active rupture air channel 5 to the explosion-proof hole 14. For example, the active rupture air channel 5 can be connected to the guide hole 13, and the guide hole 13 is connected to the explosion-proof hole 14 through the air inlet 11.

[0025] like Figure 4 and Figure 5 As shown, in other embodiments, the valve body 1 is also provided with an air supply pipe 51 that connects to the active blasting air channel 5. The air supply pipe 51 is connected to an external air source, thereby realizing the supply of air to the active blasting air channel 5.

[0026] In this embodiment, the first diaphragm 2 is annular and fits against the end face of the inner sleeve 102 near the air outlet 12 to cover the guide hole 13, so that the gas entering through the air inlet 11 can pass through the guide hole 13 and then be discharged from the first diaphragm 2 to the air outlet 12, ensuring a more stable airflow.

[0027] The vent 12 is provided with a first retaining ring 61 that abuts against the side of the first diaphragm 2 facing the valve cover 4, thereby axially limiting the first diaphragm 2 through the first retaining ring 61. The first retaining ring 61 and the vent 12 can be ultrasonically welded together. Of course, the first retaining ring 61 can also be omitted, and the first diaphragm 2 can be axially positioned by attaching it to the end face of the inner sleeve 102 near the vent 12.

[0028] In this embodiment, the inner sleeve 102 is provided with a stepped boss 141 located at one end of the explosion-proof hole 14 near the air inlet 11. The second diaphragm 3 is attached to the stepped boss 141 to cover the explosion-proof hole 14, thereby ensuring that the second diaphragm 3 has sufficient space for bulging deformation relative to the valve cover 4, and the layout is more reasonable.

[0029] The explosion-proof hole 14 is provided with a second retaining ring 62 that abuts against the side of the second diaphragm 3 facing the valve cover 4, thereby axially limiting the second diaphragm 3 through the second retaining ring 62. The second retaining ring 62 and the explosion-proof hole 14 can be ultrasonically welded together. Of course, the second retaining ring 62 can also be omitted, and the second diaphragm 3 can be axially positioned by attaching it to the stepped boss 141.

[0030] It should be noted that in the description of this application, the terms "inner" and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. All directional indications (such as up, down, left, right, front, back, inner, and outer) are only used to explain the relative positional relationships and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0031] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An explosion-proof vent valve with active controllable pressure relief, characterized in that, The device includes a valve body (1) for installation into a battery pack, a first diaphragm (2) made of breathable material, and a second diaphragm (3) made of elastic non-breathable material. One end of the valve body (1) has an air inlet (11) and the other end has an air outlet (12). The valve body (1) contains a guide hole (13) connecting the air inlet (11) and the air outlet (12), and an explosion-proof hole (14) independent of the guide hole (13) but connecting the air inlet (11) and the air outlet (12). The air outlet (12) is fitted with a valve cover (4), and the valve cover (4) has a pressure relief hole connecting the air outlet (12) and the outside. 41), the first diaphragm (2) is provided to cover the guide hole (13), the outer periphery of the second diaphragm (3) is connected to the explosion hole (14) to cover the explosion hole (14), the valve cover (4) is provided with a needle (42) facing the explosion hole (14), the valve body (1) is also provided with an active rupture air passage (5) connected to the explosion hole (14) and located on the side of the second diaphragm (3) facing away from the valve cover (4), the active rupture air passage (5) is used to supply air to the explosion hole (14) when the battery pack is abnormal, so that the second diaphragm (3) bulges and deforms towards the valve cover (4) and is punctured by the needle (42).

2. The explosion-proof vent valve with active controllable pressure relief according to claim 1, characterized in that, The valve body (1) includes an outer sleeve (101) and an inner sleeve (102). The inner sleeve (102) is connected to the inside of the outer sleeve (101) to separate the two ends of the outer sleeve (101) into an air inlet (11) and an air outlet (12). The explosion-proof hole (14) is opened axially inside the inner sleeve (102). The guide hole (13) is formed by the outer peripheral wall of the inner sleeve (102) and the inner peripheral wall of the outer sleeve (101).

3. The explosion-proof vent valve with active controllable pressure relief according to claim 2, characterized in that, The active blasting air passages (5) are multiple and distributed circumferentially along the valve body (1), and all the active blasting air passages (5) are connected to the explosion-proof hole (14).

4. The explosion-proof vent valve with active controllable pressure relief according to claim 3, characterized in that, The valve body (1) is provided with an air supply pipe (51) that connects to the active blasting air passage (5).

5. The explosion-proof vent valve with active controllable pressure relief according to claim 2, characterized in that, The first diaphragm (2) is annular and fits against the end face of the inner sleeve (102) near the air outlet (12) to cover the guide hole (13).

6. The explosion-proof vent valve with active controllable pressure relief according to claim 5, characterized in that, The vent (12) is provided with a first retaining ring (61) that abuts against the first diaphragm (2) on the side facing the valve cover (4).

7. The explosion-proof vent valve with active controllable pressure relief according to claim 2, characterized in that, The inner sleeve (102) is provided with a stepped boss (141) at one end of the explosion-proof hole (14) near the air inlet (11), and the second diaphragm (3) is attached to the stepped boss (141) to cover the explosion-proof hole (14).

8. The explosion-proof vent valve with active controllable pressure relief according to claim 7, characterized in that, The explosion-proof hole (14) is provided with a second retaining ring (62) that abuts against the second diaphragm (3) on the side facing the valve cover (4).

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