Moisture-resistant explosion-proof valve

Abstract

The utility model discloses a moisture-proof explosion-proof valve in the field of explosion-proof valves, which comprises a valve body, a protective cover and a fixed seat, the valve body is provided with a guide pillar penetrating through the valve body and a spring arranged between the guide pillar and the valve body, the spring is used for providing elastic force for the guide pillar along the direction of the valve body all the time, the fixed seat is internally provided with a communicated ventilating channel, and the ventilating channel is communicated with the protective cover. The fixing base is provided with a first containing cavity and a second containing cavity with upward openings, the first containing cavity is communicated with the second containing cavity, the second containing cavity is communicated with the through hole, the first containing cavity is provided with a silica gel sheet located on the ventilation channel, the silica gel sheet is provided with an opening, and the opening is communicated with the through hole. The second containing cavity is provided with a humidity adjusting piece located above the silica gel piece, and the second containing cavity is provided with a breathable film located above the humidity adjusting piece. According to the moisture-proof explosion-proof valve, the silica gel sheet and the humidity adjusting sheet are arranged in a stacked mode, so that external moisture is effectively prevented from entering the valve, and meanwhile internal moisture can be rapidly discharged.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valves, specifically a moisture-proof explosion-proof valve. Background Technology

[0002] The safe and reliable operation of core components in an electric vehicle's powertrain system, such as the battery pack, electronic control system, and motor, is crucial. To ensure their safe and stable operation, waterproofing and dustproofing are necessary—theoretically, a sealed state is required. However, even in a sealed state, a short circuit and thermal runaway of the power battery can generate a large amount of high-temperature gas mixture containing solid or gel-like substances. If this mixture cannot be released in time, it can typically cause a violent fire or explosion, resulting in significant personal injury and property damage. Therefore, current technical solutions involve installing a waterproof, breathable, and explosion-proof balance valve (commonly known as an explosion-proof valve) on the battery pack to address the waterproofing and explosion-proof requirements of the power battery system. The explosion-proof valve is an important safety protection device widely used in systems containing flammable gases or substances to prevent explosions caused by excessive internal pressure. It is typically installed in the high-pressure section of the system. When the internal pressure exceeds a set value, the explosion-proof valve automatically opens, releasing the internal pressure and protecting the system. In electric vehicle powertrain systems, the explosion-proof valve is primarily used for the safety protection of the battery pack. When a large amount of gas is generated inside the battery due to overpressure or abnormal temperature rise, the explosion-proof valve automatically opens, releasing the internal pressure and preventing the battery from exploding.

[0003] Existing explosion-proof valves have the following drawbacks: their design primarily focuses on pressure release and explosion-proof functionality, neglecting moisture absorption and discharge. In electric vehicle powertrain systems, core components such as battery packs require a dry environment to prevent electrical short circuits and other malfunctions. However, existing explosion-proof valves typically only have a one-way venting function or only a moisture absorption function, failing to effectively absorb and discharge moisture inside the battery pack. This inability to quickly expel internal moisture leads to moisture accumulation within the battery pack, increasing the risk of electrical failures. In addition, when in use, the explosion-proof valve is installed on the battery pack and achieves waterproof and breathable operation through a waterproof and breathable membrane. Although the waterproof and breathable membrane can prevent liquid water from entering the battery pack, it cannot prevent moisture in the air from entering the battery pack. When a large amount of moisture enters, it can cause phenomena such as short circuits in the battery pack and internal electrical systems due to changes in humidity. At the same time, existing explosion-proof valves mainly rely on internal guide post switches to block moisture. When the explosion-proof valve is activated, it severely affects the product's exhaust volume, which is only about 1 / 4 of that without a moisture-blocking valve. This seriously affects the product's breathability. The high temperature generated during operation cannot be completely discharged from the battery pack in time, leading to electrical short circuits and other malfunctions within the battery pack. Therefore, existing explosion-proof valves also have the problems of not being able to absorb moisture inside the battery pack and not being able to quickly discharge the high-temperature gas generated inside the battery pack, resulting in a small amount of moisture discharged. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a moisture-proof and explosion-proof valve, which can effectively solve the technical problems that existing explosion-proof valves cannot absorb moisture inside the battery pack, cannot quickly discharge the high-temperature gas generated inside the battery pack, and have a small amount of discharged moisture.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a moisture-proof and explosion-proof valve, including a valve body, a protective cover and a fixing seat. The valve body is provided with a guide post passing through the valve body and a spring provided between the guide post and the valve body. The spring is used to provide elastic force to the guide post in the direction of the valve body. The fixing seat is provided with a through-hole. The fixing seat has a first receiving cavity and a second receiving cavity with the opening facing upward. The first receiving cavity and the second receiving cavity are interconnected. The second receiving cavity is interconnected with a through hole. The first receiving cavity is provided with a silicone sheet located on the venting channel. The silicone sheet has an opening. The second receiving cavity is provided with a humidity regulating sheet located above the silicone sheet. The second receiving cavity is provided with a breathable membrane located above the humidity regulating sheet.

[0006] Furthermore, a sealing gasket is provided inside the first receiving cavity. The sealing gasket is located above the breathable membrane and is used to press the breathable membrane, silicone sheet, and humidity regulating sheet together. The protective cover is connected to the fixing seat through the sealing gasket.

[0007] Furthermore, a strong magnetic sheet is provided between the fixing base and the protective cover. The top end of the strong magnetic sheet is connected to the protective cover, and the bottom end of the strong magnetic sheet is connected to the sealing gasket.

[0008] Furthermore, the protective cover extends outward from its side to form several snap-fit ​​blocks, and the inner wall of the fixing seat protrudes to form an annular protrusion. The snap-fit ​​blocks and the annular protrusion are connected by a snap-fit ​​mechanism to achieve snap-fit ​​fixation between the protective cover and the fixing seat.

[0009] Furthermore, the end of the fixing seat away from the protective cover is recessed inward to form an annular groove. A sealing ring that matches the annular groove is inserted inside the annular groove. The sealing ring makes sealing contact with the upper end face of the valve body to achieve a seal between the fixing seat and the valve body.

[0010] Furthermore, one end of the valve body extends outward to form an annular portion, and a sealing element is provided at the end of the valve body near the annular portion.

[0011] Furthermore, the valve body extends outward from one end near the annular portion to form a fixing portion, which is provided with several threads.

[0012] Furthermore, the surface of the fixing base is provided with several notches, and the periphery of the protective cover extends outward to form several protrusions corresponding to the positions of the notches. An exhaust channel communicating with the first receiving cavity is formed between the notches and the protrusions.

[0013] Furthermore, a protective shell is provided at one end of the valve body, the guide post has an exhaust hole communicating with the venting channel, and an inner cavity is formed inside the protective shell.

[0014] Furthermore, the guide post and the spring are located in the inner cavity, one end of the spring is connected to the guide post, and the other end of the spring is connected to the valve body.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model moisture-proof and explosion-proof valve effectively blocks the entry of external moisture through the stacked arrangement of silicone sheet and humidity regulating sheet, while enabling rapid discharge of internal moisture. The humidity regulating sheet absorbs internal moisture, and the silicone sheet has an opening, resulting in a large exhaust area and large exhaust volume. When exhausting outward, air pressure blows air to inflate the silicone sheet, fully opening the central opening, and the gas is discharged from the opening, achieving dynamic pressure balance inside and outside the battery pack. This quickly and completely discharges the generated high-temperature gas, preventing electrical short circuits and other malfunctions inside the battery pack. Attached Figure Description

[0016] Figure 1 This is a top perspective view of the moisture-proof and explosion-proof valve of this utility model;

[0017] Figure 2 This is a cross-sectional view of the moisture-proof and explosion-proof valve of this utility model;

[0018] Figure 3 This is a perspective view of the moisture-proof and explosion-proof valve of this utility model from a bottom view.

[0019] Figure 4 This is an exploded view of the moisture-proof and explosion-proof valve of this utility model;

[0020] Figure 5 This is an exploded view of the structure of the fixing seat and sealing ring of the moisture-proof and explosion-proof valve of this utility model;

[0021] Figure 6 This is a perspective view of the valve body of the moisture-proof and explosion-proof valve of this utility model;

[0022] Figure 7 This is an exploded view of the structure of the fixing seat, silicone sheet, humidity regulating sheet, breathable membrane, sealing gasket, and strong magnetic sheet of the moisture-proof and explosion-proof valve of this utility model.

[0023] Figure 8 This is a perspective view of the protective cover of the moisture-proof and explosion-proof valve of this utility model;

[0024] Figure 9This is a perspective view of the connection between the protective cover and the fixing base of the moisture-proof and explosion-proof valve of this utility model.

[0025] Numbering on the map:

[0026] 1-Valve body; 2-Protective cover; 3-Guide post; 4-Annular part; 5-Seal; 6-Fixing part; 7-Thread; 8-Strong magnetic strip; 9-Sealing gasket; 10-Ventilating membrane; 11-Humidity regulating plate; 12-Fixing seat; 13-Ventilating channel; 14-Annular groove; 15-Sealing ring; 16-Exhaust channel; 17-Exhaust hole; 18-Spring; 19-Second receiving cavity; 20-First receiving cavity; 21-Annular protrusion; 22-Notch; 23-Snap-fit ​​block; 24-Protrusion; 25-Silicone sheet; 26-Opening; 27-Protective shell; 28-Inner cavity. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The following is combined Figures 1-9 The moisture-proof and explosion-proof valve of this utility model is described in detail below:

[0029] A moisture-proof and explosion-proof valve includes a valve body 1, a protective cover 2, and a fixing seat 12. The valve body 1 is provided with a guide post 3 passing through the valve body 1 and a spring 18 disposed between the guide post 3 and the valve body 1. The spring 18 is used to provide the guide post 3 with elastic force that always runs along the direction of the valve body 1. The fixing seat 12 is provided with a through-hole 13. The fixing seat 12 has a first receiving cavity 20 and a second receiving cavity 19 with an opening 26 facing upward. The first receiving cavity 20 and the second receiving cavity 19 are interconnected. The second receiving cavity 19 is interconnected with a through hole. The first receiving cavity 20 is provided with a silicone sheet 25 located on the through-hole 13. The silicone sheet 25 has an opening 26. The second receiving cavity 19 is provided with a humidity regulating sheet 11 located above the silicone sheet 25. The second receiving cavity 19 is provided with a breathable membrane 10 located above the humidity regulating sheet 11.

[0030] A sealing gasket 9 is provided inside the first receiving cavity 20. The sealing gasket 9 is located above the breathable membrane 10 and is used to press the breathable membrane 10, the silicone sheet 25, and the humidity regulating sheet 11 together. The protective cover 2 is connected to the fixing base 12 through the sealing gasket 9. A strong magnetic strip 8 is provided between the fixing base 12 and the protective cover 2. The top end of the strong magnetic strip 8 is connected to the protective cover 2, and the bottom end of the strong magnetic strip 8 is connected to the sealing gasket 9. A strong magnetic sheet 8 is provided between the two to enhance the connection stability. The side of the protective cover 2 extends outward to form several snap-fit ​​blocks 23. The inner wall of the fixing base 12 protrudes to form an annular protrusion 21. The snap-fit ​​blocks 23 and the annular protrusion 21 are connected by a snap-fit, realizing the snap-fit ​​fixation of the protective cover 2 and the fixing base 12. The end of the fixing base 12 away from the protective cover 2 is recessed inward to form an annular groove 14. A sealing element that matches the annular groove 14 is inserted into the interior of the annular groove 14. The sealing ring 15 makes sealing contact with the upper end face of the valve body 1 to achieve a seal between the fixing seat 12 and the valve body 1. One end of the valve body 1 extends outward to form an annular part 4. A sealing element 5 is provided at the end of the valve body 1 near the annular part 4. The valve body 1 extends outward to form a fixing part 6 at the end near the annular part 4. The fixing part 6 is provided with several threads 7. Several notches 22 are provided on the surface of the fixing seat 12. The periphery of the protective cover 2 protrudes outward to form several protrusions 24 corresponding to the positions of the notches 22. An exhaust channel 16 communicating with the first receiving cavity 20 is formed between the notches 22 and the protrusions 24. A protective shell 27 is provided at one end of the valve body 1. The guide post 3 has an exhaust hole 17 communicating with the venting channel 13. An inner cavity 28 is formed inside the protective shell 27. The guide post 3 and the spring 18 are located in the inner cavity 28. One end of the spring 18 is connected to the guide post 3, and the other end of the spring 18 is connected to the valve body 1.

[0031] In this embodiment, the bottom of the protective shell 27 is also provided with a through hole. When the explosion-proof valve is closed, the top of the guide post 3 abuts against the venting channel 13 to block the flow of internal and external gases and effectively prevent moisture from entering. When the moisture inside the battery pack is too high, the humidity regulating plate 11 absorbs the moisture. When the explosion-proof valve is open, the venting channel 13 is vented, which can quickly exhaust the internal gas. The opening 26 on the silicone sheet 25 has a large exhaust area and a large exhaust volume. When venting outward, the silicone sheet 25 is inflated by air pressure, and the opening 26 in the middle is fully opened, which quickly exhausts the gas.

[0032] By setting a breathable membrane 10, liquid water and external moisture are blocked in both directions. By setting a humidity regulating plate 11, the internal humidity of the battery pack is dynamically adjusted. When the spring 18 is in the extended state, the flow of gas between the inside and outside is completely blocked. The breathable membrane 10 blocks external moisture from entering the battery pack, and the humidity regulating plate 11 absorbs the residual moisture inside the battery pack. When the internal pressure of the battery pack exceeds the set value, the gas pressure pushes the guide post 3 to move, the spring 18 is further compressed, and the venting channel 13 is opened, realizing the exhaust of the venting channel 13. It can quickly exhaust the internal gas. The opening 26 on the silicone sheet 25 has a large exhaust area and a large exhaust volume. When exhausting outward, the silicone sheet 25 is inflated by air pressure. The gas passes sequentially through the exhaust port 17, the venting channel 13, the second receiving cavity 19, and the first receiving cavity 20, and is finally discharged through the exhaust channel 16 of the protective cover 2. This prevents high-voltage failure of internal components of the battery pack or battery pack explosion. During the pressure relief process, the venting membrane 10 prevents external impurities (external water; water vapor; moisture; salt spray particles, etc.) from entering the battery pack. The bidirectional barrier properties of the venting membrane 10 ensure that external moisture cannot invade, while allowing internal moisture to be unidirectionally regulated by the humidity regulating plate 11. When the external air pressure is greater than the set pressure, the explosion-proof valve opens, and external gas flows in, achieving the effect of balancing the internal and external pressure difference. The working principle of the explosion-proof valve is existing technology and will not be elaborated on here.

[0033] The explosion-proof valve is sealed by pressing the breathable membrane 10, silicone sheet 25 and humidity regulating sheet 11 with the protective cover 2. The snap-fit ​​block 23 on the side wall of the protective cover 2 is snapped to the annular protrusion 21 on the inner wall of the fixing seat 12. During installation, it can be locked by simply pressing. During disassembly, the snap-fit ​​block 23 can be pried open with a tool to separate it.

[0034] The protective cover 2 extends outward from its side to form several snap-fit ​​blocks 23. The inner wall of the fixing seat 12 protrudes to form an annular protrusion 21. The snap-fit ​​blocks 23 and the annular protrusion 21 are connected by a snap-fit, so that the protective cover 2 and the fixing seat 12 are snap-fit ​​fixed. The protective cover 2 and the fixing seat 12 are firmly fixed by the snap-fit ​​connection between the snap-fit ​​blocks 23 and the annular protrusion 21.

[0035] In this embodiment, the humidity regulating sheet 11 maintains stable humidity inside the battery pack by adsorbing or releasing water vapor. When the ambient humidity is too high, it adsorbs excess water; when the humidity is too low, it releases the stored water. The humidity regulating sheet 11 is composed of a polymer material layer, a breathable material layer, and a reverse osmosis protective layer. Synthetic rubber is used as a carrier and is integrated with the breathable material layer. The reverse osmosis protective layer is made of special materials, allowing gaseous water to pass freely while completely blocking liquid water. Its surface has a porous structure, which can capture or release water molecules through physical adsorption. When the humidity inside the battery pack is higher than the set value, the humidity regulating sheet 11 adsorbs water vapor to reduce the humidity. When the humidity of the battery pack is lower than the critical value, the humidity regulating sheet 11 releases the stored water to increase the humidity.

[0036] In this embodiment, the silicone sheet 25 is made of silicone material and has an opening 26. In this embodiment, the opening 26 is specifically a cross-shaped opening 26. When the pressure inside the battery pack exceeds the set value, the explosion-proof valve is in the open state. At this time, the inside of the battery pack leaks air outward. The silicone sheet 25 is inflated by air pressure, and the opening 26 in the middle of the silicone sheet 25 is fully opened. The gas is discharged from the opening 26, realizing the dynamic balance of pressure inside and outside the battery pack. When the pressure inside the battery pack does not exceed the set value, the explosion-proof valve is in the closed state. At this time, the silicone sheet 25 is tightly attached to the fixing seat 12, and the opening 26 in the middle of the silicone sheet 25 is completely closed.

[0037] The moisture-proof and explosion-proof valve in this embodiment effectively blocks the entry of external moisture through the stacked arrangement of silicone sheet 25 and humidity regulating sheet 11, while enabling rapid discharge of internal moisture. The humidity regulating sheet 11 absorbs internal moisture. The silicone sheet 25 has an opening 26, resulting in a large exhaust area and large exhaust volume. When exhausting outward, air pressure blows air to inflate the silicone sheet 25, fully opening the central opening 26 and rapidly discharging the gas. This quickly and completely discharges the generated high-temperature gas, preventing malfunctions such as short circuits in the battery pack and internal electrical components.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A moisture-proof and explosion-proof valve, comprising a valve body, a protective cover, and a fixing base, wherein the valve body is provided with a guide post passing through the valve body and a spring disposed between the guide post and the valve body, the spring being used to provide a spring force to the guide post that is always along the direction of the valve body, characterized in that: The mounting base has an internal ventilation channel. The mounting base has a first and a second accommodating cavity with the opening facing upwards. The first and second accommodating cavities are interconnected. The second accommodating cavity is interconnected with a through hole. The first accommodating cavity is provided with a silicone sheet located on the ventilation channel. The silicone sheet has an opening. The second accommodating cavity is provided with a humidity regulating sheet located above the silicone sheet. The second accommodating cavity is provided with a breathable membrane located above the humidity regulating sheet.

2. The moisture-proof and explosion-proof valve according to claim 1, characterized in that: The first receiving cavity is provided with a sealing gasket, which is located above the breathable membrane. The sealing gasket is used to press the breathable membrane, silicone sheet and humidity regulating sheet together. The protective cover is connected to the fixing base through the sealing gasket.

3. The moisture-proof and explosion-proof valve according to claim 2, characterized in that: A strong magnetic sheet is provided between the fixing base and the protective cover. The top end of the strong magnetic sheet is connected to the protective cover, and the bottom end of the strong magnetic sheet is connected to the sealing gasket.

4. The moisture-proof and explosion-proof valve according to claim 1, characterized in that: The protective cover extends outward from its side to form several snap-fit ​​blocks, and the inner wall of the fixing base protrudes to form an annular protrusion. The snap-fit ​​blocks and the annular protrusion are connected by a snap-fit ​​mechanism to achieve snap-fit ​​fixation between the protective cover and the fixing base.

5. The moisture-proof and explosion-proof valve according to claim 1, characterized in that: The end of the fixed seat away from the protective cover is recessed inward to form an annular groove. A sealing ring that matches the annular groove is inserted inside the annular groove. The sealing ring makes sealing contact with the upper end face of the valve body to achieve a seal between the fixed seat and the valve body.

6. The moisture-proof and explosion-proof valve according to claim 1, characterized in that: One end of the valve body extends outward to form an annular portion, and a sealing element is provided at the end of the valve body near the annular portion.

7. The moisture-proof and explosion-proof valve according to claim 6, characterized in that: The valve body extends outward from one end near the annular portion to form a fixing part, and the fixing part is provided with several threads.

8. The moisture-proof and explosion-proof valve according to any one of claims 1-6, characterized in that: The surface of the fixing base is provided with several notches, and the periphery of the protective cover extends outward to form several protrusions corresponding to the positions of the notches. An exhaust channel communicating with the first receiving cavity is formed between the notches and the protrusions.

9. The moisture-proof and explosion-proof valve according to any one of claims 1-6, characterized in that: One end of the valve body is provided with a protective shell, the guide post has an exhaust hole communicating with the venting channel, and an inner cavity is formed inside the protective shell.

10. The moisture-proof and explosion-proof valve according to claim 9, characterized in that: The guide post and spring are located in the inner cavity. One end of the spring is connected to the guide post, and the other end of the spring is connected to the valve body.

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