Smokeless explosion-proof breather valve

Abstract

The utility model provides a smokeless explosion -proof breather valve, including valve body, first diaphragm and second diaphragm made of elastic non -breathable material by breathable material, one end of the valve body is equipped with the air inlet hole and is equipped with the air outlet hole in another end, the valve body is equipped with the flow guide hole of the communication air inlet hole and air outlet hole, and the explosion -proof hole is communicated with the air inlet hole and air outlet hole independently, the air outlet hole is equipped with the valve cover and is equipped with the pressure -relief hole of the communication air outlet hole and outside, the first diaphragm covers the flow guide hole setting, the outer peripheral side of second diaphragm is connected to the explosion -proof hole to realize the covering of explosion -proof hole, the valve cover is equipped with the needle towards the explosion -proof hole, the filter layer is equipped in the explosion -proof hole and is located the position of second diaphragm towards air inlet hole side, the above -mentioned scheme prevents the battery package from happening heat spread and explosion simultaneously and makes the gas of battery package exhaust be smokeless state, guarantees the security of user.

Description

Technical Field

[0001] This utility model relates to the technical field of explosion-proof vent valves, and more specifically to a smokeless 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, under normal working conditions, the gas pressure inside the battery pack changes 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 (caused by internal short circuits, external impacts, or high temperatures), its temperature can rise rapidly, releasing a large amount of gas. This can then affect surrounding battery packs, creating a chain reaction of thermal propagation. To ensure battery pack safety, explosion-proof valves are typically installed in the battery pack casing. When the gas inside the battery pack expands and the pressure rises, the explosion-proof valve automatically opens to release pressure, effectively preventing thermal propagation and battery pack explosion.

[0004] However, considering that the gas released during thermal runaway of the battery pack contains a large number of smoke particles, when the explosion-proof valve is opened and pressure is released, the gas containing smoke particles will be quickly discharged and spread into the vehicle, which may cause users to experience breathing difficulties, suffocation and other situations, posing a significant safety hazard. Utility Model Content

[0005] The purpose of this invention is to solve the problem that when the explosion-proof valve in the prior art is opened and depressurized, the gas containing smoke particles in the battery pack will be rapidly discharged and spread into the vehicle, which may cause users to experience breathing difficulties, suffocation, and other situations, posing a significant safety hazard.

[0006] To address the aforementioned problems, this utility model provides a smokeless explosion-proof breathable valve, comprising a valve body, a first diaphragm made of breathable material, and a second diaphragm made of 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 contains 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, and the outer periphery of the second diaphragm is connected to the explosion-proof hole to cover it. The valve cover has a needle pointing towards the explosion-proof hole, and a filter layer is provided inside the explosion-proof hole on the side of the second diaphragm facing the air inlet.

[0007] The above solution covers the air guide hole with a first diaphragm made of breathable material. When the battery pack is working normally and a pressure difference is generated inside and outside, the gas inside the battery pack can be slowly and continuously discharged from the air inlet through the air guide hole and the air outlet through the pressure relief hole, or the external gas can be slowly and continuously discharged from the pressure relief hole through the air outlet and the air guide hole and then into the battery pack through the air inlet, thus achieving air pressure balance. This process does not require puncturing the second diaphragm, and the second diaphragm does not participate in air permeation, effectively avoiding the unexpected opening and failure of the explosion-proof vent valve under normal working conditions. When the battery pack experiences thermal runaway and the internal pressure rises sharply and abnormally, the high-pressure gas flows from the air inlet to the explosion-proof vent and pushes the second diaphragm to deform elastically until it contacts the needle on the valve cover and is punctured. At this time, the gas inside the battery pack can be quickly discharged from the explosion-proof vent through the exhaust port and the pressure relief port, achieving rapid pressure relief and preventing the battery pack from thermally spreading and exploding. During this process, the smoke particles in the gas can be effectively filtered by the filter layer inside the explosion-proof vent, so that the discharged gas is smokeless, ensuring the safety of the user.

[0008] In an improved embodiment, the valve body includes an outer cylinder and an inner cylinder. The inner cylinder is connected to the interior of the outer cylinder to separate the two ends of the outer cylinder into an air inlet and an air outlet. The explosion-proof hole is axially formed within the inner cylinder. The flow guide hole is formed by the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder, thereby making the valve body structure compact and easy to manufacture. At the same time, the flow guide hole with an annular radial cross-section has a large flow area, which can ensure that the gas flows uniformly between the flow guide hole and the air outlet. The explosion-proof hole is located on the inner side of the inner cylinder, ensuring that the second diaphragm has sufficient elastic deformation space.

[0009] In an improved embodiment, a retaining cover is provided at the axial center of the explosion-proof hole, the retaining cover having a circumferential through hole, and a raised stepped boss is provided on the inner wall of the explosion-proof hole near the air inlet. The filter layer is abutted between the retaining cover and the stepped boss, and the second diaphragm is attached to the side of the retaining cover facing the air outlet, thereby achieving the installation and fixation of the filter layer and the second diaphragm through the retaining cover and the stepped boss.

[0010] In an improved embodiment, the filter layer includes a polymer fiber material layer on one side of the stepped protrusion, a polymer adsorbent material layer on the other side of the cover, and a chemisorbent material layer between the polymer fiber material layer and the polymer adsorbent material layer. Thus, when gas from the battery pack enters the explosion-proof hole through the second through-hole, it first passes through the polymer fiber material layer to filter out large particles of smoke, achieving a first filtration. Then, the chemisorbent material layer reacts with toxic and harmful components in the gas, achieving a second filtration. Finally, the polymer adsorbent material layer adsorbs fine smoke particles in the gas, achieving a third filtration, ensuring effective removal of impurities from the gas.

[0011] In an improved embodiment, the chemical adsorption material layer is made of fibers containing calcium hydroxide or magnesium hydroxide, which enables it to react with the relevant components of the gas generated by thermal runaway of the battery pack, thereby achieving adsorption and filtration.

[0012] In an improved embodiment, the filter layer further includes a custom adsorbent material layer located between the card cap and the polymer adsorbent material layer, thereby enabling targeted removal of relevant harmful components of the gases generated by thermal runaway of the battery pack.

[0013] In an improved embodiment, a sleeve is also included, in which the polymer fiber material layer, the chemical adsorption material layer, and the polymer adsorption material layer are all embedded. The sleeve is embedded in the explosion-proof hole and located between the cover and the stepped boss. Thus, during assembly, the polymer fiber material layer, the chemical adsorption material layer, and the polymer adsorption material layer can be pre-installed in the sleeve, and then the sleeve is installed into the explosion-proof hole, making assembly simpler and more convenient.

[0014] In an improved embodiment, a first retaining ring and a second retaining ring are also included. The first diaphragm is connected to the end face of the inner cylinder facing the valve cover. The first retaining ring is connected to the vent hole and abuts against the side of the first diaphragm facing the valve cover by ultrasonic welding. The second retaining ring is connected to the explosion-proof hole and abuts against the side of the second diaphragm facing the valve cover by ultrasonic welding. Thus, the first diaphragm is fastened by the first retaining ring, and the second diaphragm is fastened by the second retaining ring. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one side of the valve cover of a smokeless explosion-proof vent valve; Figure 2 A schematic diagram showing the assembly of the first diaphragm of a smokeless explosion-proof vent valve within the valve orifice; Figure 3 A top view schematic diagram of a smokeless explosion-proof vent valve; Figure 4 For along Figure 3 Schematic diagram of the cross section line AA in the middle.

[0016] Explanation of reference numerals in the attached figures. 1. Valve body; 101. Outer cylinder; 102. Inner cylinder; 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; 43. Filter screen; 5. First retaining ring; 6. Second retaining ring; 7. Retaining cap; 71. Through hole; 8. Filter layer; 81. Polymer fiber material layer; 82. Chemical adsorption material layer; 83. Polymer adsorption material layer; 9. Sleeve. 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 1-4 An embodiment of this utility model provides a smokeless explosion-proof breathable valve, including a valve body 1, 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 is provided with an air inlet 11 and the other end is provided with an air outlet 12. The valve body 1 is provided with a guide hole 13 that connects the air inlet 11 and the air outlet 12, and an explosion-proof hole 14 that is independent of the guide hole 13 but connects the air inlet 11 and the air outlet 12. The air outlet 12 is provided with a valve cover 4, and the valve cover 4 is provided with a pressure relief hole 41 that connects the air outlet 12 and 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. A filter layer 8 is provided in the explosion-proof hole 14 at the position of the second diaphragm 3 facing the air inlet 11.

[0022] The above solution covers the guide hole 13 with a first diaphragm 2 made of breathable material. When the battery pack is working normally and a pressure difference is generated inside and outside, the gas inside the battery pack can be slowly and continuously discharged from the air inlet 11 through the guide hole 13 and the air outlet 12 through the pressure relief hole 41, or the external gas can be slowly and continuously discharged from the pressure relief hole 41 through the air outlet 12 and the guide hole 13 and then into the battery pack through the air inlet 11, so as to achieve air pressure balance. This process does not require puncturing the second diaphragm 3. The second diaphragm 3 does not participate in air permeation, which effectively avoids the unexpected opening and failure of the explosion-proof vent valve under normal working conditions. When the battery pack experiences thermal runaway and the internal pressure rises sharply and abnormally, the high-pressure gas flows from the air inlet 11 to the explosion-proof hole 14 and pushes the second diaphragm 3 to deform elastically until it contacts the needle 42 of the valve cover 4 and is punctured. At this time, the gas inside the battery pack can be quickly discharged from the explosion-proof hole 14 through the exhaust hole and the pressure relief hole 41, achieving rapid pressure relief and preventing the battery pack from thermally spreading and exploding. During this process, the smoke particles of the gas can be effectively filtered by the filter layer 8 in the explosion-proof hole 14, so that the discharged gas is smokeless for at least a period of time (e.g., 5 minutes), ensuring the safety of the user.

[0023] In an improved embodiment, the valve body 1 includes an outer cylinder 101 and an inner cylinder 102. The inner cylinder 102 is connected to the interior of the outer cylinder 101 to separate the two ends of the outer cylinder 101 into an air inlet 11 and an air outlet 12. The explosion-proof hole 14 is axially opened inside the inner cylinder 102. The guide hole 13 is formed by the outer peripheral wall of the inner cylinder 102 and the inner peripheral wall of the outer cylinder 101, thereby making the valve body 1 compact and easy to process. At the same time, the guide hole 13 with an annular radial cross-section has a large flow area, which can ensure that the gas flows uniformly between the guide hole 13 and the air outlet 12. The explosion-proof hole 14 is located inside the inner cylinder 102 to ensure that the second diaphragm 3 has sufficient elastic deformation space.

[0024] In an improved embodiment, a retaining cover 7 is provided at the axial center of the explosion-proof hole 14. The retaining cover 7 has a circumferential through hole 71. The inner wall of the explosion-proof hole 14 near the air inlet 11 has a raised stepped boss 141. The filter layer 8 is abutted between the retaining cover 7 and the stepped boss 141. The second diaphragm 3 is attached to the side of the retaining cover 7 facing the air outlet 12, thereby achieving the installation and fixation of the filter layer 8 and the second diaphragm 3 through the retaining cover 7 and the stepped boss 141.

[0025] In this embodiment, the filter layer 8 includes a polymer fiber material layer 81 located on one side of the stepped protrusion 141, a polymer adsorption material layer 83 located on one side of the cover 7, and a chemical adsorption material layer 82 located between the polymer fiber material layer 81 and the polymer adsorption material layer 83. Thus, when the gas from the battery pack enters the explosion-proof hole 14 through the second through hole 71, it first passes through the polymer fiber material layer 81 to filter out large particulate smoke in the gas, achieving the first filtration. Then, the chemical adsorption material layer 82 performs a chemical reaction on the toxic and harmful components in the gas, achieving the second filtration. Finally, the polymer adsorption material layer 83 adsorbs the fine smoke particles in the gas, achieving the third filtration, ensuring the effective removal of impurities in the gas.

[0026] As an improvement to filter layer 8, filter layer 8 also includes a custom adsorption material layer (not shown in the figure). The custom adsorption material layer is located between the card cover 7 and the polymer adsorption material layer 83, thereby achieving targeted removal of relevant harmful components of the gas generated by thermal runaway of the battery pack.

[0027] As an optimization of the above embodiment, it also includes a sleeve 9. The polymer fiber material layer 81, the chemical adsorption material layer 82, and the polymer adsorption material layer 83 are all embedded in the sleeve 9. The sleeve 9 is embedded in the explosion-proof hole 14 and is located between the cover 7 and the stepped boss 141. Thus, during assembly, the polymer fiber material layer 81, the chemical adsorption material layer 82, and the polymer adsorption material layer 83 can be pre-installed in the sleeve 9, and then the sleeve 9 is installed into the explosion-proof hole 14, making the assembly simpler and more convenient.

[0028] In an improved embodiment, a first retaining ring 5 and a second retaining ring 6 are also included. The first diaphragm 2 is connected to the end face of the inner cylinder 102 facing the valve cover 4. The first retaining ring 5 is connected to the vent 12 by ultrasonic welding and abuts against the side of the first diaphragm 2 facing the valve cover 4. The second retaining ring 6 is connected to the explosion-proof hole 14 by ultrasonic welding and abuts against the side of the second diaphragm 3 facing the valve cover 4. Thus, the first retaining ring 5 secures the first diaphragm 2, and the second retaining ring 6 secures the second diaphragm 3. Of course, the connection between the end face of the first diaphragm 2 relative to the side of the inner cylinder 102 facing the valve cover 4 and the connection between the second diaphragm 3 and the retaining cover 7 can also be achieved by adhesive or other conventional methods, both of which fall within the scope of this design.

[0029] In addition, a filter screen 43 can be installed on the side of the valve cover 4 facing the valve hole. The filter screen 43 can effectively reduce the probability of impurities such as gravel and insects entering the valve hole through the pressure relief hole 41, thus achieving protection.

[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. A smokeless explosion-proof vent valve, characterized in that, The valve includes a valve body (1), 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 provided with… The valve cover (4) is provided with a pressure relief hole (41) that connects the air outlet (12) and 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 explosion-proof hole (14) is provided with a filter layer (8) located on the side of the second diaphragm (3) facing the air inlet (11).

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

3. The smokeless explosion-proof vent valve according to claim 1 or 2, characterized in that, The explosion-proof hole (14) has a cover (7) in the middle of its axial direction. The cover (7) has a through hole (71) along the circumference. The inner wall of the explosion-proof hole (14) near the air inlet (11) has a raised stepped boss (141). The filter layer (8) is abutted between the cover (7) and the stepped boss (141). The second diaphragm (3) is attached to the side of the cover (7) facing the air outlet (12).

4. The smokeless explosion-proof vent valve according to claim 3, characterized in that, The filter layer (8) includes a polymer fiber material layer (81) located on one side of the stepped protrusion (141), a polymer adsorption material layer (83) located on one side of the cover (7), and a chemisorption material layer (82) located between the polymer fiber material layer (81) and the polymer adsorption material layer (83).

5. The smokeless explosion-proof vent valve according to claim 4, characterized in that, The filter layer (8) also includes a custom adsorption material layer located between the cap (7) and the polymer adsorption material layer (83).

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