A smokeless explosion-proof valve for a battery

Abstract

The utility model discloses a kind of smokeless explosion-proof valve for battery, the explosion-proof valve aims at solving the problem that existing battery explosion-proof valve will be accompanied by the discharge of smoke during exhaust process, pose serious threat to human health. The explosion-proof valve includes shell, main plastic umbrella valve, breathable smokeless membrane and protective cover plate, shell has sealing surface and cover plate mounting surface, installation groove is opened at cover plate mounting surface, first breathable hole and second breathable hole are opened in the inner wall of installation groove, the size of first breathable hole is greater than second breathable hole, main plastic umbrella valve is installed at first breathable hole. The utility model is installed breathable smokeless membrane at the cover plate mounting surface of shell, when battery pack temperature sharply rises, internal pressure is too large to open main plastic umbrella valve, so that gas pressure leaks along gas passage to outside shell, at this time, due to the existence of breathable smokeless membrane, smoke in battery pack cannot come out, thereby avoiding threat to human health.

Description

Technical Field

[0001] This utility model belongs to the field of explosion-proof valve technology, specifically relating to a smokeless explosion-proof valve for batteries. Background Technology

[0002] In today's energy storage field, batteries, as a key component, are widely used in various electronic devices, electric vehicles, and energy storage systems. With the continuous expansion of battery applications, their safety has become an increasingly important concern. Battery explosion-proof valves, as crucial components for ensuring battery safety, open to release pressure when the internal pressure of the battery becomes too high, preventing serious accidents such as explosions. However, the venting process of the explosion-proof valve often involves the release of smoke, which may contain various harmful substances such as heavy metal particles and volatile organic compounds, posing a serious threat to human health. Summary of the Invention

[0003] (1) Technical problems to be solved In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a smokeless explosion-proof valve for batteries. This explosion-proof valve aims to solve the problem that existing battery explosion-proof valves emit smoke during the venting process, which poses a serious threat to human health.

[0004] (2) Technical solution To solve the above-mentioned technical problems, this utility model provides a smokeless explosion-proof valve for batteries. The explosion-proof valve includes a shell, a main plastic umbrella valve, a breathable smokeless membrane, and a protective cover. The shell has a sealing surface and a cover mounting surface. An installation groove is provided at the cover mounting surface. The inner wall of the installation groove has a first vent hole and a second vent hole. The first vent hole is larger than the second vent hole. The main plastic umbrella valve is installed at the first vent hole. The main plastic umbrella valve is used to allow gas on the sealing surface to flow to the cover mounting surface. The breathable smokeless membrane is fixedly connected to the cover mounting surface of the shell. The protective cover is snapped and fixed at the cover mounting surface, and a gas channel is formed between the protective cover and the shell.

[0005] Preferably, a sealing ring is installed on the outer side of the sealing surface of the housing, and mounting holes are provided at all four corners of the sealing surface of the housing.

[0006] Furthermore, the breathable and smoke-free membrane is made of smoke-proof and breathable nanomaterials.

[0007] Furthermore, the inner wall of the protective cover is larger than the size of the shell, and multiple guide blocks are fixedly connected to the inner wall of the protective cover.

[0008] Furthermore, the inner wall of the guide block is provided with a slot, the outer surface of the housing is fixedly connected with a corresponding slot, and the outer surface of the housing is fixedly connected with multiple limiting blocks corresponding to the protective cover.

[0009] Furthermore, a breathable membrane is fixedly connected to the second vent.

[0010] Furthermore, an auxiliary plastic umbrella valve is installed at the second vent, which is used to allow gas on the mounting surface of the cover plate to flow towards the sealing surface.

[0011] (3) Beneficial effects Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a sealing surface to connect the shell and the battery pack to form a seal. The main plastic umbrella valve seals the first vent hole. When there is a pressure difference between the inside and outside of the battery pack, the pressure difference is balanced through the second vent hole and the breathable smokeless membrane. When the temperature of the battery pack rises sharply, the internal pressure becomes too high and opens the main plastic umbrella valve. At this time, a large amount of pressure is released through the first vent hole and the breathable smokeless membrane, allowing the gas pressure to leak out of the shell along the gas channel. At this time, due to the presence of the breathable smokeless membrane, the smoke inside the battery pack cannot come out, thereby avoiding a threat to human health. 2. This utility model features an auxiliary plastic umbrella valve installed at the second vent. When the battery pack temperature rises and the internal pressure becomes excessive, the main plastic umbrella valve opens, allowing pressure to be released through the first vent and the breathable smokeless membrane. When the battery pack temperature decreases, a negative pressure forms inside, causing the auxiliary plastic umbrella valve to open. The pressure difference is then balanced through the second vent and the breathable smokeless membrane. Once the internal and external pressure differences are balanced, the auxiliary plastic umbrella valve closes, thus preventing external moisture from entering the battery pack through the breathable smokeless membrane and the second vent. This provides better moisture isolation compared to using a breathable membrane. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of this utility model.

[0013] Figure 2 This is a bottom-view three-dimensional structural diagram of Embodiment 1 of this utility model.

[0014] Figure 3 This is a schematic diagram of the shell structure of Embodiment 1 of this utility model.

[0015] Figure 4 This is a schematic diagram of the protective cover structure of Embodiment 1 of this utility model.

[0016] Figure 5 This is a cross-sectional structural diagram of Embodiment 1 of this utility model.

[0017] Figure 6 This is a schematic diagram of the shell structure of Embodiment 2 of this utility model.

[0018] Figure 7 This is a bottom view of the shell structure of Embodiment 2 of this utility model.

[0019] The markings in the attached diagram are as follows: 1. Housing; 2. Main plastic umbrella valve; 3. Breathable smokeless membrane; 4. Protective cover plate; 5. Sealing surface; 6. Cover plate mounting surface; 7. Mounting groove; 8. First vent hole; 9. Second vent hole; 101. Gas passage; 10. Sealing ring; 11. Mounting hole; 12. Guide block; 13. Slot; 14. Locking block; 15. Limiting block; 16. Breathable membrane; 17. Auxiliary plastic umbrella valve. Detailed Implementation

[0020] Example 1

[0021] This specific embodiment is a smokeless explosion-proof valve for batteries, and its structural schematic diagram is shown below. Figures 1-5 As shown, the explosion-proof valve includes a housing 1, a main plastic umbrella valve 2, a breathable smokeless membrane 3, and a protective cover 4. The housing 1 has a sealing surface 5 and a cover mounting surface 6. A mounting groove 7 is provided on the cover mounting surface 6. A first vent hole 8 and a second vent hole 9 are provided on the inner wall of the mounting groove 7. The first vent hole 8 is larger than the second vent hole 9. The main plastic umbrella valve 2 is installed at the first vent hole 8. The plastic umbrella valve is a type of one-way sealing valve made primarily of rubber or silicone, widely used in fluid control, leak prevention, and backflow prevention applications. The first vent hole 8... An internal mounting bracket extends into the main plastic umbrella valve 2, which has an umbrella head and a mounting post. The mounting post is snapped and fixed in the middle of the mounting bracket and forms a seal on the first vent hole 8. When the pressure on the sealing surface 5 side is too high, the main plastic umbrella valve 2 can open to release pressure. The main plastic umbrella valve 2 is used to allow the gas on the sealing surface 5 side to flow to the cover plate mounting surface 6. The breathable smokeless membrane 3 is fixedly connected to the cover plate mounting surface 6 of the housing 1. The protective cover 4 is snapped and fixed to the cover plate mounting surface 6, and a gas channel 101 is formed between the protective cover 4 and the housing 1. During use, the sealing surface 5 of the housing 1 is connected to the battery pack to form a seal. The main plastic umbrella valve 2 seals the first vent 8. When there is a pressure difference between the inside and outside of the battery pack, the pressure difference is balanced through the second vent 9 and the breathable smokeless membrane 3. When the temperature of the battery pack rises sharply, the internal pressure becomes too high and opens the main plastic umbrella valve 2. At this time, a large amount of pressure is released through the first vent 8 and the breathable smokeless membrane 3, causing the gas pressure to leak out of the housing 1 along the gas channel 101. At this time, due to the presence of the breathable smokeless membrane 3, the smoke inside the battery pack cannot come out, thus avoiding a threat to human health.

[0022] To improve the sealing during connection, such as Figure 1 and Figure 2 As shown: In this embodiment, a sealing ring 10 is installed on the outer side of the sealing surface 5 of the housing 1. Mounting holes 11 are provided at the four corners of the sealing surface 5 of the housing 1. The mounting holes 11 are threaded to facilitate fixing with screws. The sealing ring 10 improves the sealing effect.

[0023] In this embodiment, the breathable smokeless membrane 3 is a smoke-proof and breathable nanomaterial. Smoke-proof and breathable nanomaterials are a type of functional material that integrates nanotechnology. Its core lies in achieving multiple properties through the design of microstructures at the nanoscale. Functionally, this type of material not only has the characteristics of traditional waterproof and breathable materials, that is, breathable, but also reduces the penetration of smoke particles by optimizing pore size distribution and surface modification technology.

[0024] like Figure 2-5 As shown: In this embodiment, the inner wall of the protective cover plate 4 is larger than the size of the shell 1, and multiple guide blocks 12 are fixedly connected to the inner wall of the protective cover plate 4. The shell 1 and the protective cover plate 4 are rectangular, circular or other shaped structures. The protective cover plate 4 is fastened to the shell 1 without shaking by the guide blocks 12 evenly distributed on the outside. At this time, the guide blocks 12 form a gas channel 101 between the shell 1 and the protective cover plate 4.

[0025] like Figure 2-5 As shown: In this embodiment, the inner wall of the guide block 12 is provided with a slot 13, and the outer surface of the housing 1 is fixedly connected with a corresponding locking block 14. The outer surface of the housing 1 is also fixedly connected with a plurality of limiting blocks 15 corresponding to the protective cover plate 4. In this way, when the protective cover plate 4 is fastened on the housing 1, the locking block 14 and the slot 13 can shrink and deform until the protective cover plate 4 contacts the limiting block 15. At this time, a gap is left at the end to form a gas channel 101, and the locking block 14 and the slot 13 are reset and locked together.

[0026] To prevent dust from entering the battery pack through the second vent 9, such as Figure 1-3 As shown: In this embodiment, a breathable membrane 16 is fixedly connected to the second vent 9. The breathable membrane 16 is a material with a microporous structure, which allows gas to pass through but prevents liquids and larger particulate matter from passing through.

[0027] Example 2 like Figure 6 and Figure 7 As shown: In this embodiment, the difference from the first embodiment is that an auxiliary plastic umbrella valve 17 is installed at the second vent hole 9. The auxiliary plastic umbrella valve 17 is used to allow the gas on the side of the cover plate mounting surface 6 to flow to the sealing surface 5. The second vent hole 9 extends inward with a mounting bracket. The auxiliary plastic umbrella valve 17 has an umbrella head and a mounting post. It is fixed in the middle of the mounting bracket by the mounting post and forms a seal on the first vent hole 8.

[0028] During use, the sealing surface 5 of the housing 1 is connected to the battery pack to form a seal. The main plastic umbrella valve 2 seals the first vent 8. When the battery pack temperature rises and the internal pressure is too high, the main plastic umbrella valve 2 opens. At this time, the pressure is released through the first vent 8 and the breathable smokeless membrane 3. When the battery pack temperature drops, a negative pressure will be formed inside. At this time, the pressure difference causes the auxiliary plastic umbrella valve 17 to open. The internal and external pressure difference is balanced through the second vent 9 and the breathable smokeless membrane 3. After the internal and external pressure difference is balanced, the auxiliary plastic umbrella valve 17 closes, thereby preventing external moisture from entering the battery pack through the breathable smokeless membrane 3 and the second vent 9. Compared with using the breathable membrane 16, the moisture isolation effect is better. With the main plastic umbrella valve 2 opening under positive pressure and the auxiliary plastic umbrella valve 17 opening under negative pressure, the pressure range forms a unique sealed protection area, ensuring that the battery system is always in a sealed state within this area, thus better protecting the battery system.

[0029] All technical features in this embodiment can be freely combined according to actual needs.

[0030] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A smokeless explosion-proof valve for batteries, the explosion-proof valve comprising a housing (1), a main plastic umbrella valve (2), a breathable smokeless membrane (3), and a protective cover (4), characterized in that: The housing (1) has a sealing surface (5) and a cover mounting surface (6). A mounting groove (7) is provided on the cover mounting surface (6). A first vent hole (8) and a second vent hole (9) are provided on the inner wall of the mounting groove (7). The first vent hole (8) is larger than the second vent hole (9). The main plastic umbrella valve (2) is installed at the first vent hole (8). The main plastic umbrella valve (2) is used to allow the gas on the sealing surface (5) to flow to the cover mounting surface (6). The breathable smokeless membrane (3) is fixedly connected to the cover mounting surface (6) of the housing (1). The protective cover (4) is snapped and fixed at the cover mounting surface (6), and a gas channel (101) is formed between the protective cover (4) and the housing (1).

2. The smokeless explosion-proof valve for batteries according to claim 1, characterized in that, A sealing ring (10) is installed on the outside of the sealing surface (5) of the housing (1), and mounting holes (11) are provided at the four corners of the sealing surface (5) of the housing (1).

3. The smokeless explosion-proof valve for batteries according to claim 2, characterized in that, The breathable and smokeless membrane (3) is a smoke-proof and breathable nanomaterial.

4. The smokeless explosion-proof valve for batteries according to claim 3, characterized in that, The inner wall of the protective cover (4) is larger than the size of the shell (1), and multiple guide blocks (12) are fixedly connected to the inner wall of the protective cover (4).

5. The smokeless explosion-proof valve for batteries according to claim 4, characterized in that, The inner wall of the guide block (12) is provided with a slot (13), and the outer surface of the housing (1) is fixedly connected with a corresponding card block (14), and the outer surface of the housing (1) is fixedly connected with a plurality of limiting blocks (15) corresponding to the protective cover plate (4).

6. The smokeless explosion-proof valve for batteries according to claim 5, characterized in that, A breathable membrane (16) is fixedly connected to the second vent (9).

7. The smokeless explosion-proof valve for batteries according to claim 5, characterized in that, An auxiliary plastic umbrella valve (17) is installed at the second vent (9). The auxiliary plastic umbrella valve (17) is used to allow gas on the side of the cover plate mounting surface (6) to flow to the sealing surface (5).

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