Fire filtering assembly and its explosion-proof valve

Abstract

This application relates to the field of battery manufacturing technology and provides a fire filtering assembly and an explosion-proof valve equipped with it. The fire filtering assembly of this application includes a first fire filtering mesh and a second fire filtering mesh arranged sequentially along the fire filtering direction. The first fire filtering mesh includes a first main body and a first connecting portion located at the edge of the first main body. The first main body has a plurality of first fire filtering holes, and the first connecting portion is used to connect to the explosion-proof valve body. The second fire filtering mesh includes a second main body and a second connecting portion located on the second main body. The second main body has a plurality of second fire filtering holes, and the second connecting portion is used to connect to the first connecting portion. Along the fire filtering direction, the projections of each first fire filtering hole and each second fire filtering hole are staggered, and a fire filtering cavity is formed between the first main body, the second main body, the first connecting portion, and the second connecting portion. The fire filtering assembly of this application enhances the fire filtering effect, thus helping to improve the performance of the explosion-proof valve.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a fire filter assembly and an explosion-proof valve equipped with it. Background Technology

[0002] With the development of the new energy vehicle industry, the number of new energy vehicles on the road is gradually increasing, and their safety performance has become a key concern in the industry. In new energy vehicles, the battery pack is the core energy storage component, and its thermal runaway directly affects vehicle safety.

[0003] To address the thermal runaway problem of battery packs, explosion-proof valves are commonly installed on them. These valves release pressure within the battery pack, reducing the risk of explosion. Within these valves, the flame filter assembly is a crucial component preventing flames from erupting from the battery pack. However, common flame filter assemblies often employ a single-layer filter mesh, resulting in poor flame filtration and failing to meet the thermal runaway requirements of the battery pack. This poses a safety risk and hinders the improvement of the overall quality of explosion-proof valves. Utility Model Content

[0004] In view of this, this application aims to provide a fire filtering assembly to improve the performance of explosion-proof valves.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A fire filtering assembly, applied to an explosion-proof valve, includes a first fire filtering mesh and a second fire filtering mesh arranged sequentially along the fire filtering direction; The first fire filter includes a first main body with a plurality of first fire filter holes, and a first connecting part located at the edge of the first main body, the first connecting part being used to connect to the explosion-proof valve body; The second fire filter includes a second main body portion having a plurality of second fire filter holes, and a second connecting portion disposed at the edge of the second main body portion, the second connecting portion being connected to the first connecting portion; Along the fire filtering direction, the projections of each of the first fire filtering holes and the projections of each of the second fire filtering holes are staggered, and a fire filtering cavity is formed between the first main body, the second main body, the first connecting part and the second connecting part.

[0006] Furthermore, each of the first fire filtering holes corresponds one-to-one with each of the second fire filtering holes, and along the fire filtering direction, the misalignment rate λ between the projection of each first fire filtering hole and the projection of the corresponding second fire filtering hole satisfies: λ > 95%.

[0007] Furthermore, along the filtering direction, the projected area S1 of each first filtering hole and the projected area S2 of the corresponding second filtering hole satisfy the following relationship: 2 ≤ S1 = S2 ≤ 5 mm 2; and / or, the distance L1 between two adjacent first filter holes and the distance L2 between two adjacent second filter holes satisfy the following condition: 0.8≤L1=L2≤1.5mm.

[0008] Furthermore, the projected area S1 of each of the first fire filtering holes and the distance L1 between two adjacent first fire filtering holes satisfy the following condition: 2 < S1 / L1 < 3.

[0009] Furthermore, along the fire filtering direction, the distance H between the first main body and the second main body satisfies: 6≤H≤12mm; and / or, the wall thickness t1 of the first fire filter and the wall thickness t2 of the second fire filter satisfy: 0.7≤t1=t2≤1.2mm.

[0010] Furthermore, the first fire filter and / or the second fire filter are provided with a fireproof coating, and the coating thickness t3 of the fireproof coating satisfies: 80≤t3≤110um.

[0011] Furthermore, the spacing H, the wall thickness t1 of the first fire filter, and the coating thickness t3 satisfy the following condition: 1 ≤ t1 / t3 - H ≤ 2.

[0012] Furthermore, along the filtration direction, the projected outline of the first filtration hole is circular or polygonal; and / or, along the filtration direction, the projected outline of the second filtration hole is circular or polygonal.

[0013] Furthermore, the edge of the second main body is provided with a blocking portion extending toward the first main body. There are multiple blocking portions and multiple second connecting portions. The first connecting portions are multiple portions that correspond one-to-one with each of the second connecting portions. Each blocking portion and each second connecting portion is arranged alternately along the periphery of the second main body, and the fire filtering cavity is formed between the first main body, the second main body, each of the first connecting portions, each of the second connecting portions and each of the blocking portions.

[0014] Compared with related technologies, this application has the following advantages: (1) The fire filtering assembly described in this application forms a double-layer fire filtering structure through the cooperation of the first fire filtering mesh and the second fire filtering mesh, which facilitates better filtration of flames and sparks in the material generated by thermal runaway. Furthermore, the arrangement of the first connecting part and the second connecting part facilitates the assembly of the first fire filtering mesh, the second fire filtering mesh and the explosion-proof valve body. Moreover, by setting the projections of the first fire filtering hole and the second fire filtering hole in the fire filtering direction to be staggered, and by forming the fire filtering cavity, it is helpful to further filter the material after it has been filtered by the first fire filtering mesh, thereby helping to achieve a better fire filtering effect and improving the quality of use of the explosion-proof valve.

[0015] (2) By ensuring that the offset ratio λ between the projection of the first filter hole and the projection of the corresponding second filter hole satisfies: λ>95%, it helps to reduce the probability that the material filtered by the first filter mesh directly passes through the second filter mesh. This can confine the flames and sparks in the material generated by thermal runaway within the filter cavity, and discharge them through the explosion-proof valve after secondary filtration by the second filter mesh, thus helping to achieve a better filtration effect.

[0016] (3) By ensuring that the projected area S1 of the first filter hole and the projected area S2 of the corresponding second filter hole satisfy the following condition: 2≤S1=S2≤5mm 2 This design avoids blockage, facilitates exhaust, is easy to manufacture, and ensures effective fire filtering. Furthermore, it ensures that the distance L1 between two adjacent first fire filtering holes and the distance L2 between two adjacent second fire filtering holes satisfy the following condition: 0.8 ≤ L1 = L2 ≤ 1.5 mm. This facilitates the manufacturing of the fire filtering mesh, helps ensure its structural strength, and is beneficial for design and implementation.

[0017] (4) By ensuring that the projected area S1 of each first filter hole and the distance L1 between two adjacent first filter holes satisfy: 2 < S1 / L1 < 3, it helps to further improve the fire filtering effect of the fire filtering assembly, which is helpful for design and implementation.

[0018] (5) By ensuring that the distance H between the first main body and the second main body along the fire filtering direction satisfies: 6≤H≤12mm, the fire filtering effect is guaranteed while taking into account the space occupancy rate of the explosion-proof valve, which is conducive to design and implementation. At the same time, by ensuring that the wall thickness t1 of the first fire filter and the wall thickness t2 of the second fire filter satisfy: 0.7≤t1=t2≤1.2mm, the processing and manufacturing of the first fire filter and the second fire filter are facilitated, and it helps to ensure the structural strength of the first fire filter and the second fire filter, which is also conducive to design and implementation.

[0019] (6) By setting the fireproof coating, it is easy to improve the use effect of the first fire filter and the second fire filter, and by making the thickness t3 of the fireproof coating meet the requirement of 80≤t3≤110um, it is beneficial to ensure the setting effect of the fireproof coating.

[0020] (7) By ensuring that the spacing H, the wall thickness t1 of the first fire filter, and the coating thickness t3 satisfy: 1≤t1 / t3-H≤2, it is beneficial to control the overall size of the fire filter structure, and also helps to ensure the fire filter effect, which is conducive to design and implementation.

[0021] (8) By making the projected outlines of the first and second filter holes circular or polygonal, it is easy to process and manufacture, and it is helpful for design implementation.

[0022] (9) The setting of the baffle part facilitates the formation of the fire filter chamber and helps to confine the sparks and flames in the material filtered by the first fire filter to the fire filter chamber. It can also provide a certain degree of protection for the explosion-proof valve body, preventing the sparks and flames in the fire filter chamber from directly contacting the explosion-proof valve body, which is conducive to design and implementation.

[0023] This application also proposes an explosion-proof valve, including an explosion-proof valve body and a fire filter assembly as described above disposed on one side of the explosion-proof valve body.

[0024] The explosion-proof valve described in this application has the same beneficial effects as the fire filtering assembly described above compared to the prior art, so it will not be described again here. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the fire filtering assembly described in an embodiment of this application; Figure 2 This is a top view of the fire filtering assembly described in the embodiments of this application; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the fire filtering assembly described in this application assembled on the body of the explosion-proof valve; Figure 5 This is an exploded view of the fire filtering assembly described in this application embodiment assembled on the explosion-proof valve body; Figure 6 This is a top view of the fire filtering assembly described in this application embodiment assembled on the explosion-proof valve body; Figure 7 for Figure 6 Cross-sectional view at point AA; Explanation of reference numerals in the attached figures: 1. First fire filter; 101. First filter hole; 102. First main body; 103. First connecting part; 104. Positioning groove; 2. Second fire filter; 201. Second filter hole; 202. Second main body; 203. Second connecting part; 204. Positioning protrusion; 205. Blocking part; 3. Explosion-proof valve body; 301. Valve core; K. Filter chamber. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is 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. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a fire filtering assembly applied to an explosion-proof valve. It is mainly used to filter sparks and flames from materials passing through the explosion-proof valve during battery thermal runaway. Furthermore, the fire filtering assembly in this embodiment, through its innovative structural design, can provide better filtration effects, thereby helping to improve the performance of the explosion-proof valve.

[0033] In related technologies, with the development of the new energy vehicle industry and the increasing number of new energy vehicles on the road, their safety performance has become a key concern in the industry. In new energy vehicles, the battery pack, as its core energy storage component, is directly affected by thermal runaway, impacting vehicle safety.

[0034] To address the thermal runaway problem of battery packs, explosion-proof valves are commonly installed on them. These valves release pressure within the battery pack, reducing the risk of explosion. Within these valves, the flame filter assembly is a crucial component preventing flames from erupting from the battery pack. However, common flame filter assemblies often employ a single-layer filter mesh, resulting in poor flame filtration and failing to meet the thermal runaway requirements of the battery pack. This poses a safety risk and hinders the improvement of the overall quality of explosion-proof valves.

[0035] In view of this, in order to overcome the shortcomings of the related technology, the fire filtering assembly in this embodiment combines... Figures 1 to 3 As shown, the overall design includes a first fire filter 1 and a second fire filter 2.

[0036] The first fire filter 1 and the second fire filter 2 are arranged sequentially along the fire filtering direction. The first fire filter 1 includes a first main body 102 with a plurality of first fire filter holes 101 and a first connecting part 103 at the edge of the first main body 102. The first connecting part is used to connect with the explosion-proof valve body 3. The second fire filter 2 includes a second main body 202 and a second connecting part 203 on the second main body 202. The second main body 202 is provided with a plurality of second fire filter holes 201. The second connecting part 203 is used to connect with the first connecting part 103. Along the fire filtering direction, the projections of each first fire filter hole 101 and the projections of each second fire filter hole 201 are staggered. A fire filtering cavity K is formed between the first main body 102, the second main body 202, the first connecting part 103 and the second connecting part 203.

[0037] Thus, the cooperation of the first fire filter 1 and the second fire filter 2 forms a double-layer fire filter structure, which facilitates better filtration of flames and sparks in substances generated by thermal runaway. Furthermore, the arrangement of the first connecting part 103 and the second connecting part 203 facilitates the assembly of the first fire filter 1, the second fire filter 2, and the explosion-proof valve body 3. By staggering the projections of the first fire filter hole 101 and the second fire filter hole 201 in the fire filtering direction, and by forming the fire filter cavity K, it is helpful to further filter the substances filtered by the first fire filter 1, thereby achieving a better fire filtering effect and improving the quality of use of the explosion-proof valve.

[0038] Based on the above overview, specifically regarding the fire filtering component in this embodiment, combined with... Figures 4 to 7As shown in the illustration, as an exemplary embodiment, the fire filtering assembly in this embodiment is generally connected to the explosion-proof valve body 3.

[0039] The above-mentioned fire filtering components are usually assembled on the explosion-proof valve body 3 by bolts. In this embodiment, for example, bolt through holes can be opened on the first connecting part 103 and the second connecting part 203, and bolt holes can be opened at the corresponding positions of the explosion-proof valve body 3. The first fire filtering mesh 1 and the second fire filtering mesh 2 are assembled into one piece and assembled on the explosion-proof valve body 3 by bolts.

[0040] In specific implementation, in order to facilitate the positioning and assembly of the first fire filter 1 and the second fire filter 2, the first connecting part 103 is provided with a positioning groove 104, and the second connecting part 203 is provided with a positioning protrusion 204. When the first connecting part 103 and the second connecting part 203 are connected, the positioning protrusion 204 is located in the positioning groove 104.

[0041] In addition, in order to improve the connection stability between the first fire filter 1 and the second fire filter 2 and the explosion-proof valve body 3, bolt holes can also be provided at the corners of the first connecting part 103 and the second connecting part 203. The first fire filter 1 and the second fire filter 2 are assembled on the explosion-proof valve body 3 by bolts, and the connection stability of the first fire filter 1 and the second fire filter 2 on the explosion-proof valve body 3 is improved in conjunction with the positioning protrusion 204 and the positioning groove 104.

[0042] The explosion-proof valve body 3 described above can be adapted from the relevant structures in existing explosion-proof valves during specific implementation, and will not be elaborated further here. It is worth mentioning that when the valve core 301 of the explosion-proof valve adopts a spring-triggered valve core 301, a corresponding clearance hole is provided in the middle of the first fire filter 1 and the second fire filter 2 corresponding to the installation position of the spring-triggered valve core 301, to facilitate the assembly of the valve core 301.

[0043] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, this embodiment may, for example, make each first filter hole 101 correspond one-to-one with each second filter hole 201, and along the filter direction, the misalignment rate λ between the projection of each first filter hole 101 and the projection of the corresponding second filter hole 201 satisfies: λ > 95%.

[0044] It is understandable that by ensuring that the misalignment rate λ between the projection of the first fire filter hole 101 and the projection of the corresponding second fire filter hole 201 satisfies λ > 95%, it helps to reduce the probability that the material filtered by the first fire filter 1 directly passes through the second fire filter 2. This allows the flames and sparks in the material generated by thermal runaway to be confined in the fire filter cavity K, and then discharged from the explosion-proof valve after secondary filtration by the second fire filter 2, thus helping to achieve a better fire filtration effect.

[0045] In specific implementation, the misalignment rate λ between the projections of the first filter hole 101 and the second filter hole 201 along the filter direction refers to the misalignment rate of the overlapping areas of the projections of the first filter hole 101 and the second filter hole 201, that is, the overlap rate of the overlapping areas of the projections of each of the first filter holes 101 and the corresponding second filter holes 201 along the filter direction is less than 5%.

[0046] Continue to combine Figures 1 to 7 As shown, in some exemplary embodiments, this embodiment may, for example, satisfy the following conditions along the filtration direction: the projected area S1 of each first filtration hole 101 and the projected area S2 of the corresponding second filtration hole 201 are: 2≤S1=S2≤5mm2, and the distance L1 between two adjacent first filtration holes 101 and the distance L2 between two adjacent second filtration holes 201 are: 0.8≤L1=L2≤1.5mm.

[0047] It is understandable that by ensuring that the projected area S1 of the first filter hole 101 and the projected area S2 of the corresponding second filter hole 201 satisfy the condition 2≤S1=S2≤5mm2, blockage can be avoided, exhaust can be facilitated, and the processing and manufacturing can be made easier, while ensuring the filtering effect. At the same time, ensuring that the distance L1 between two adjacent first filter holes 101 and the distance L2 between two adjacent second filter holes 201 satisfy the condition 0.8≤L1=L2≤1.5mm, the processing and manufacturing of the filter mesh can be made easier, and it can help ensure the structural strength of the filter mesh and facilitate design and implementation.

[0048] In specific implementation, the projected area S1 of the first fire filter hole 101 and the projected area S2 of the second fire filter hole 201 refer to the area of ​​the projected outline of the first fire filter hole 101 and the second fire filter hole 201. The distance L1 between two adjacent first fire filter holes 101 refers to the distance between the two closest edges of the outline of the two adjacent first fire filter holes 101. The distance L2 between two adjacent second fire filter holes 201 refers to the distance between the two closest edges of the outline of the two adjacent second fire filter holes 201.

[0049] Continue to combine Figures 1 to 7 As shown, in some exemplary embodiments, this embodiment may, for example, satisfy the following condition: 2 < S1 / L1 < 3 between the projected area S1 of each first filter hole 101 and the distance L1 between two adjacent first filter holes 101.

[0050] It is understandable that by ensuring that the projected area S1 of each first fire filter hole 101 and the distance L1 between two adjacent first fire filter holes 101 satisfy the condition that 2 < S1 / L1 < 3, it is helpful to further improve the fire filtering effect of the fire filter assembly, which is helpful for design and implementation.

[0051] In specific implementation, the relationship between the area S2 of each second filter hole 201 and the distance L2 between two adjacent second filter holes 201 can also be referred to the relationship between the projected area S1 of each first filter hole 101 and the distance L1 between two connected first filter holes 101. The relationship between the area S2 of each second filter hole and the distance L2 between two adjacent second filter holes 201 satisfies: 2 < S2 / L2 < 3.

[0052] Continue to combine Figures 1 to 7 As shown, in some exemplary embodiments, this embodiment may, for example, satisfy the following conditions along the fire filtering direction: the distance H between the first main body 102 and the second main body 202 is: 6≤H≤12mm, and the wall thickness t1 of the first fire filter 1 and the wall thickness t2 of the second fire filter 2 is: 0.7≤t1=t2≤1.2mm.

[0053] It is understandable that by ensuring that the distance H between the first main body 102 and the second main body 202 along the filtration direction satisfies: 6≤H≤12mm, the filtration effect is guaranteed while taking into account the space occupancy rate of the explosion-proof valve, which is conducive to design and implementation. At the same time, by ensuring that the wall thickness t1 of the first filtration mesh 1 and the wall thickness t2 of the second filtration mesh 2 satisfies: 0.7≤t1=t2≤1.2mm, the processing and manufacturing of the first filtration mesh 1 and the second filtration mesh 2 are facilitated, and the structural strength of the first filtration mesh 1 and the second filtration mesh 2 is guaranteed, which is also conducive to design and implementation.

[0054] In specific implementation, the distance H between the first main body 102 and the second main body 202 refers to the distance between the surface of the first main body 102 facing the second main body 202 and the surface of the second main body 202 facing the first main body 102. The wall thickness t1 of the first fire filter 1 refers to the distance between the two end faces of the first fire filter 1 along the fire filtering direction. The wall thickness t2 of the second fire filter 2 refers to the distance between the two end faces of the second fire filter 2 along the fire filtering direction.

[0055] Continuing with reference to the figures shown, in some exemplary embodiments, this embodiment may, for example, provide a fire-retardant coating on the first fire filter 1 and the second fire filter 2, wherein the thickness t3 of the fire-retardant coating satisfies: 80≤t3≤110um.

[0056] It is understandable that the application of fire-retardant coatings can improve the effectiveness of the first fire filter 1 and the second fire filter 2. Furthermore, by ensuring that the thickness t3 of the fire-retardant coating meets the requirement of 80≤t3≤110um, the effectiveness of the fire-retardant coating application can be guaranteed.

[0057] In practical implementation, the above fire-retardant coating can be referenced, for example, the fire-retardant coating (such as aluminosilicate coating) installed on the fire filter screen in existing explosion-proof valves, and will not be elaborated further here. The thickness t3 of the above fire-retardant coating refers to the distance between the outer surface of the fire-retardant coating and the surface in contact with the fire filter screen.

[0058] Continue to combine Figures 1 to 7 As shown, in some exemplary embodiments, taking the provision of fire-resistant coatings on the first fire filter 1 and the second fire filter 2 as an example, this embodiment can, for example, ensure that the spacing H, the wall thickness t1 of the first fire filter 1, and the coating thickness t3 satisfy the following: 1≤t1 / t3-H≤2.

[0059] It is understandable that by ensuring that the spacing H, the wall thickness t1 of the first fire filter 1, and the coating thickness t3 satisfy the condition 1≤t1 / t3-H≤2, it is beneficial to control the overall size of the fire filter structure, ensure the fire filter effect, and facilitate design and implementation.

[0060] In practical implementation, the spacing H, the wall thickness t1 of the first fire filter 1, and the coating thickness t3 need to be selected according to the specific fire filter material (such as stainless steel), the coating material (such as aluminosilicate), and the design space of the explosion-proof valve.

[0061] Continue to combine Figures 1 to 7 As shown, in some exemplary embodiments, this embodiment may, for example, make the projected outlines of the first filter hole 101 and the second filter hole 201 circular or polygonal along the filter direction.

[0062] It is understandable that making the projected outlines of the first filter hole 101 and the second filter hole 201 circular or polygonal facilitates manufacturing and design implementation.

[0063] In practical implementation, the projected outlines of the first fire filtering hole 101 and the second fire filtering hole 201 are selected as circles or polygons, which facilitates processing and manufacturing. Of course, the projected outlines of the first fire filtering hole 101 and the second fire filtering hole 201 can also be other geometric shapes (such as triangles) on existing fire filtering nets, or other irregular shapes, as long as they can achieve the fire filtering effect.

[0064] Continue to combine Figures 1 to 7 As shown, in some of the exemplary embodiments, the edge of the second body portion 202 is provided with a stop portion 205.

[0065] In this configuration, the aforementioned blocking portions 205 extend from the edge of the second main body portion 202 toward the first main body portion 102. There are multiple blocking portions 205 and multiple second connecting portions 203, with each first connecting portion 103 corresponding to one of the second connecting portions 203. The blocking portions 205 and the second connecting portions 203 are arranged alternately along the periphery of the second main body portion 202, and the fire filtering cavity K is formed between the first main body portion 102, the second main body portion 202, each first connecting portion 103, each second connecting portion 203, and each blocking portion 205.

[0066] It is understandable that the setting of the baffle 205 facilitates the formation of the fire filter chamber K and helps to confine the sparks and flames in the material filtered by the first fire filter 1 within the fire filter chamber K. It can also provide a certain degree of protection for the explosion-proof valve body 3, preventing the sparks and flames in the fire filter chamber K from directly contacting the explosion-proof valve body 3, which is beneficial for design and implementation.

[0067] In practical implementation, the above-mentioned blocking portion 205 and the second connecting portion 203 can be integrally formed with the second main body portion 202 (such as sheet metal bending processing), and the above-mentioned first connecting portion 103 can also be integrally formed with the first main body portion 102. Furthermore, the two sides of the above-mentioned blocking portion 205 can extend towards each of the second connecting portions 203 to better form the fire filtering cavity K.

[0068] It is worth noting that, regarding the fire filtering component of this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 7 As shown, it generally includes a first fire filter 1 and a second fire filter 2.

[0069] The first fire filter 1 and the second fire filter 2 are arranged sequentially along the fire filtering direction. The first fire filter 1 includes a first main body 102 with a plurality of first fire filtering holes 101, and a first connecting part 103 located at the edge of the first main body 102, the first connecting part 103 being used to connect to the explosion-proof valve body 3. The second fire filter 2 includes a second main body 202 with a plurality of second fire filtering holes 201, and a second connecting part 203 located at the edge of the second main body 202, the second connecting part 203 being connected to the first connecting part 103.

[0070] The first and second fire-filtering holes 101 and 201 are both diamond-shaped. The second fire-filtering mesh 2 is provided with a blocking portion 205 extending towards the first fire-filtering mesh 1. The blocking portion 205 extends from the second main body 202 towards the first main body 102, and there are multiple blocking portions 205 and multiple connecting portions 203. The first connecting portions 103 are multiple, each corresponding to one of the second connecting portions 203. The blocking portions 205 and the second connecting portions 203 are arranged alternately along the periphery of the second main body 202.

[0071] Along the filtration direction, the projections of each first filtration hole 101 and each second filtration hole 201 are staggered, and a filtration cavity K is formed between the first main body 102, the second main body 202, the first connecting part 103, the second connecting part 203, and the blocking part 205. The first connecting part 103 is provided with a positioning groove 104, the second connecting part 203 is provided with a positioning protrusion 204, and both the first connecting part 103 and the second connecting part 203 are provided with multiple bolt through holes.

[0072] Both the first fire filter mesh 1 and the second fire filter mesh 2 are provided with a fireproof coating. The misalignment ratio λ between the projections of each first fire filter hole 101 and each second fire filter hole 201 satisfies: λ>95%. The projected area S1 of each first fire filter hole 101 and the projected area S2 of the corresponding second fire filter hole 201 satisfy: 2≤S1=S2≤5mm2. The distance L1 between two adjacent first fire filter holes 101 and the distance L2 between two adjacent second fire filter holes 201 satisfy: 0.8≤L1=L2≤1.5mm.

[0073] The projected area S1 of each first fire filter hole 101 and the distance L1 between two adjacent first fire filter holes 101 satisfy the condition: 2 < S1 / L1 < 3. The area S2 of each second fire filter hole and the distance L2 between two adjacent second fire filter holes 201 satisfy the condition: 2 < S2 / L2 < 3.

[0074] Along the fire filtering direction, the distance H between the first main body 102 and the second main body 202 satisfies: 6≤H≤12mm, the wall thickness t1 of the first fire filter 1 and the wall thickness t2 of the second fire filter 2 satisfies: 0.7≤t1=t2≤1.2mm, the coating thickness t3 of the fireproof coating satisfies: 80≤t3≤110um, and the distance H, the wall thickness t1 of the first fire filter 1, and the coating thickness t3 satisfy: 1≤t1 / t3-H≤2.

[0075] In the above preferred embodiments, the specific settings and arrangements of the first fire filter 1, the second fire filter 2, the first fire filter hole 101 and the second fire filter hole 201, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the first fire filter 1, the second fire filter 2, the first fire filter hole 101 and the second fire filter hole 201, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0076] The fire filtering assembly of this embodiment adopts the above design. Through the cooperation of the first fire filtering mesh 1 and the second fire filtering mesh 2, a double-layer fire filtering mesh structure is formed, which facilitates better filtration of flames and sparks in the material generated by thermal runaway. By setting the projections of the first fire filtering hole 101 and the second fire filtering hole 201 in the fire filtering direction to be staggered, and by forming the fire filtering cavity K, it is helpful to further filter the material after it has been filtered by the first fire filtering mesh 1, thereby helping to achieve a better fire filtering effect and improving the quality of use of the explosion-proof valve.

[0077] An embodiment of the second aspect of this application provides an explosion-proof valve, which includes an explosion-proof valve body 3 and a fire filter assembly as described above disposed on one side of the explosion-proof valve body 3.

[0078] In this embodiment, the flame filtering assembly is located on the side of the explosion-proof valve facing the inside of the battery pack. Other related structures in this explosion-proof valve can be derived from existing explosion-proof valve structures and will not be described in detail here.

[0079] The explosion-proof valve of this embodiment, through the setting of the fire filtering component as described above, forms a double-layer fire filtering structure through the cooperation of the first fire filtering mesh 1 and the second fire filtering mesh 2, which facilitates better filtration of flames and sparks in the material generated by thermal runaway. By setting the projections of the first fire filtering hole 101 and the second fire filtering hole 201 in the fire filtering direction to be staggered, and by forming the fire filtering cavity K, it is helpful to further filter the material after it has been filtered by the first fire filtering mesh 1, thereby helping to achieve a better fire filtering effect and improving the quality of use of the explosion-proof valve.

[0080] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A fire filtering assembly, applied to an explosion-proof valve, characterized in that: It includes a first fire filter mesh and a second fire filter mesh arranged sequentially along the fire filtering direction; The first fire filter includes a first main body with a plurality of first fire filter holes, and a first connecting part located at the edge of the first main body, the first connecting part being used to connect to the explosion-proof valve body; The second fire filter includes a second main body portion having a plurality of second fire filter holes, and a second connecting portion disposed at the edge of the second main body portion, the second connecting portion being connected to the first connecting portion; Along the fire filtering direction, the projections of each of the first fire filtering holes and the projections of each of the second fire filtering holes are staggered, and a fire filtering cavity is formed between the first main body, the second main body, the first connecting part and the second connecting part.

2. The fire filtering assembly according to claim 1, characterized in that: Each of the first fire filtering holes corresponds one-to-one with each of the second fire filtering holes, and along the fire filtering direction, the misalignment rate λ between the projection of each first fire filtering hole and the projection of the corresponding second fire filtering hole satisfies: λ > 95%.

3. The fire filtering assembly according to claim 1, characterized in that: Along the filtering direction, the projected area S1 of each first filtering hole and the projected area S2 of the corresponding second filtering hole satisfy the following relationship: 2 ≤ S1 = S2 ≤ 5 mm 2 ; and / or, The distance L1 between two adjacent first filter holes and the distance L2 between two adjacent second filter holes satisfy the following condition: 0.8≤L1=L2≤1.5mm.

4. The fire filtering assembly according to claim 3, characterized in that: The projected area S1 of each of the first fire filtering holes and the distance L1 between two adjacent first fire filtering holes satisfy the following condition: 2 < S1 / L1 < 3.

5. The fire filtering assembly according to claim 1, characterized in that: Along the filtering direction, the distance H between the first main body and the second main body satisfies: 6 ≤ H ≤ 12 mm; and / or, The wall thickness t1 of the first fire filter and the wall thickness t2 of the second fire filter satisfy the following condition: 0.7≤t1=t2≤1.2mm.

6. The fire filtering assembly according to claim 5, characterized in that: The first fire filter and / or the second fire filter are provided with a fireproof coating, and the coating thickness t3 of the fireproof coating satisfies: 80≤t3≤110um.

7. The fire filtering assembly according to claim 6, characterized in that: The spacing H, the wall thickness t1 of the first fire filter, and the coating thickness t3 satisfy the following condition: 1 ≤ t1 / t3 - H ≤ 2.

8. The fire filtering assembly according to claim 1, characterized in that: Along the filtering direction, the projected outline of the first filtering hole is circular or polygonal; and / or, Along the filtering direction, the projected outline of the second filtering hole is circular or polygonal.

9. The fire filtering assembly according to any one of claims 1 to 8, characterized in that: The edge of the second main body is provided with a blocking portion extending toward the first main body. There are multiple blocking portions and multiple second connecting portions. The first connecting portion is a plurality of portions corresponding one-to-one with each of the second connecting portions. Each of the blocking portions and each of the second connecting portions are arranged alternately along the periphery of the second main body, and the fire filtering cavity is formed between the first main body, the second main body, each of the first connecting portions, each of the second connecting portions and each of the blocking portions.

10. An explosion-proof valve, characterized in that: It includes an explosion-proof valve body and a fire filter assembly as described in any one of claims 1 to 9 disposed on one side of the explosion-proof valve body.

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