Ventilation valve, battery pack and vehicle

Abstract

The invention discloses a ventilation valve, a battery pack and a vehicle, the ventilation valve comprises a valve body, a double-layer ventilation film is arranged in the valve body, a first sealing ring is arranged at the tail part of the first end of the valve body, the first end of the valve body is used for being connected with an external structure, and a second sealing ring is arranged at the tail part of the second end of the valve body; and the first sealing ring is used for sealing a contact surface between the tail part of the ventilation valve and the external structure. And the first sealing ring can be used as the last sealing protection line of the ventilation valve, so that a secondary sealing protection line effect can be achieved on the ventilation valve after other sealing forms fail, and the sealing performance of the battery pack is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack structural parts, and in particular to a vent valve, a battery pack and a vehicle. Background Art

[0002] In the prior art, a battery pack is usually provided with a vent valve so that the air pressure inside and outside the battery pack can be balanced through the vent valve. When the internal air pressure is too high, the opening can be increased to release the pressure inside the battery pack.

[0003] The current air valve generally adopts a single-layer sealing structure. If the single-layer seal fails, the overall seal will fail, causing impurities in the external environment to enter the battery pack, thereby affecting the performance of the battery pack. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a breathable valve, wherein a first sealing ring is installed at the rear of the breathable valve, thereby increasing the sealing protection line of the breathable valve and ensuring the sealing performance of the battery pack.

[0005] The present invention further provides a battery pack.

[0006] The invention further proposes a vehicle.

[0007] According to the first aspect of the present invention, the breathable valve includes: a valve body, a double-layer breathable membrane is arranged inside the valve body, a first sealing ring is arranged at the tail of the first end of the valve body, the first end of the valve body is used to be connected to an external structure, and the first sealing ring is used to seal the contact surface between the tail of the breathable valve and the external structure.

[0008] According to the air valve of the embodiment of the present invention, a first sealing ring is installed at the tail of the air valve, which increases the sealing protection line of the air valve and ensures the sealing performance of the battery pack.

[0009] According to the breathable valve of the embodiment of the present invention, a portion of the first sealing ring extends into the valve body and covers the exhaust opening at the first end of the valve body.

[0010] According to some embodiments of the present invention, the first sealing ring includes a main body and a protruding portion, the protruding portion is arranged to protrude relative to the main body toward the first end of the valve body, the main body covers the tail of the first end of the valve body, and the protruding portion extends into the valve body and has an interference fit with the exhaust opening.

[0011] According to some embodiments of the present invention, the first sealing ring is a high compression sealing ring.

[0012] According to some embodiments of the present invention, a second sealing ring is disposed on the outer side of the valve body, and the second sealing ring is used to seal the contact surface between the outer side of the breathable valve and the external structure.

[0013] According to some embodiments of the present invention, an external thread is disposed on the outer side of the first end of the valve body, and the second sealing ring is sleeved on an end of the external thread adjacent to the second end of the valve body.

[0014] According to some embodiments of the present invention, the outer diameter of the first end of the valve body is smaller than the outer diameter of the second end of the valve body and a step is formed between the first end and the second end of the valve body, and the second sealing ring is partially embedded in the tail of the second end of the valve body and surrounds the outer side of the first end of the valve body.

[0015] According to some embodiments of the present invention, the double-layer breathable membrane comprises: a first breathable membrane and a second breathable membrane, and the first breathable membrane and the second breathable membrane are spaced apart along the axial direction of the valve body.

[0016] According to some embodiments of the present invention, a first channel and a second channel are formed inside the valve body and penetrate the valve body axially. The first channel and the second channel are connected to form a channel for gas exchange, and the first channel is farther away from the first sealing ring than the second channel. The first breathable membrane is fixed in the first channel, and the second breathable membrane is fixed in the second channel.

[0017] According to some embodiments of the present invention, the first air-permeable membrane is fixed to the end of the second end of the valve body away from the tail of the valve body, and the second air-permeable membrane is fixed to the inside of the first end of the valve body.

[0018] According to some embodiments of the present invention, a third breathable membrane is disposed inside the valve body, the double-layer breathable membrane and the third breathable membrane are spaced apart along the axial direction of the valve body, and the third breathable membrane is fixed to the inner side of the tail of the valve body and is disposed close to the first sealing ring.

[0019] According to some embodiments of the present invention, the air valve further includes a third air permeable membrane support, which is installed inside the valve body, and a third channel is formed inside the third air permeable membrane support which axially penetrates the third air permeable membrane support, and the third air permeable membrane is fixed in the third channel.

[0020] According to some embodiments of the present invention, one axial end of the first sealing ring abuts against the third breathable membrane support, and an inner diameter of the first sealing ring is greater than a diameter of the third channel.

[0021] According to some embodiments of the present invention, the breathable valve further includes: a valve cover, which is installed on the end of the second end of the valve body away from the tail of the valve body, and a breathable structure is formed between the valve cover and the second end of the valve body, and the breathable structure is connected to the inside of the valve body to form a channel for gas exchange.

[0022] According to the second aspect of the present invention, the battery pack includes a battery tray and the above-mentioned air valve, the battery tray is provided with an air-permeable structure, the first end of the valve body is embedded in the air-permeable structure, and the first sealing ring is adapted to the air-permeable structure.

[0023] A vehicle according to an embodiment of the third aspect of the present invention comprises a vehicle body and a battery pack as described above, wherein the battery pack is accommodated in the vehicle body.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 Schematic diagram of the failure mode of the vent valve according to the embodiment of the present invention without installing the first sealing ring Figure 1 ; Figure 2 Schematic diagram of the failure mode of the vent valve according to the embodiment of the present invention without installing the first sealing ring Figure 2 ; Figure 3 yes Figure 2 Schematic diagram of the specific failure mode of the middle air-permeable valve after the valve body is broken; Figure 4 is a front view of the overall structure of the first sealing ring installed in the air-permeable valve according to an embodiment of the present invention; Figure 5 is a schematic diagram of the internal structure of a first sealing ring installed in a breathable valve according to an embodiment of the present invention; Figure 6 is an axonometric diagram of the overall structure of the first sealing ring installed in the breathable valve according to an embodiment of the present invention; Figure 7 is an exploded schematic diagram of a first sealing ring installed in a breathable valve according to an embodiment of the present invention; Figure 8 is a schematic diagram of water locking when a first sealing ring is installed in a breathable valve according to an embodiment of the present invention; Fig. 9 is a schematic structural diagram of a breathable valve installed with a third breathable membrane according to an embodiment of the present invention; Fig.10Schematic diagram of water locking when a third breathable membrane is installed in a breathable valve according to an embodiment of the present invention.

[0026] Reference numerals: 100. Breathable valve; 1. Valve body; 101. First end; 102. Second end; 103. Exhaust opening; 104. External thread; 105. First channel; 106. Second channel; 2. Double-layer breathable membrane; 201. First breathable membrane; 202. Second breathable membrane; 3. First sealing ring; 301. Main body; 302. Protruding part; 4. Second sealing ring; 5. Third breathable membrane; 6. Third breathable membrane bracket; 601. Third channel; 7. Valve cover; 8. Breathable structure. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0028] Refer to the following Figure 1-Figure 10 A breathable valve according to an embodiment of the present invention is described.

[0029] In the prior art, the valve body of the air valve is suitable for extending into the battery pack tray / battery pack shell, and the valve body of the air valve is sealed with the battery pack tray / battery pack shell to ensure the sealing performance inside the battery pack. Most air valves balance the internal and external pressure difference through the membrane at the end of the valve body away from the battery pack, and seal with the battery pack locking part through the seal at the end. However, the following failure modes are often prone to occur. The first is that when the single-layer seal fails or is damaged, it cannot be effectively sealed with the battery pack locking part, forming a water vapor intrusion channel, such as Figure 1 The second type is that when the valve body is broken, the end membrane and the seal may fail at the same time, forming a water vapor intrusion channel, such as Figure 2 and Figure 3 The fracture form and water inlet path shown. In addition, when the valve cover at the end of the valve body falls off, the end membrane of the valve body is in direct contact with the external environment, which is more likely to damage the water inlet and form a water vapor intrusion channel. Regardless of the above failure mode, water vapor from the external environment will gradually enter the battery pack, which will cause the water storage in the battery pack to increase over time, thereby creating safety risks or electrical insulation failure. To this end, the present invention proposes a breathable valve to solve the above technical problems.

[0030] like Figure 4-Figure 10 As shown, the breathable valve 100 includes: a valve body 1, a double-layer breathable membrane 2 is arranged inside the valve body 1, a first sealing ring 3 is arranged at the tail of the first end 101 of the valve body 1, the first end 101 of the valve body 1 is used to be connected to an external structure, and the first sealing ring 3 is used to seal the contact surface between the tail of the breathable valve 100 and the external structure.

[0031] Specifically, taking the external structure of a battery pack as an example, the air valve 100 is installed on the battery pack tray. When the gas inside the battery pack increases and the internal pressure increases, the gas inside the battery pack can enter the valve body 1 through the tail of the valve body 1, and pass through the double-layer air-permeable membrane 2 inside the valve body 1 in turn to be discharged to the outside, thereby reducing the pressure inside the battery pack shell and reducing safety risks. When dust, water vapor and fine solid particles in the external environment of the battery pack fall into the air valve 100, the double-layer air-permeable membrane 2 performs double-layer protection, which can not only prevent dust and fine solid particles from entering the battery pack, but also prevent water vapor from entering, thereby improving the waterproof and dustproof performance of the air valve 100. Therefore, the double-layer air-permeable membrane 2 can not only play a role in ventilation, but also prevent impurities from entering the battery pack.

[0032] Moreover, a first sealing ring 3 is installed at the tail of the first end 101 of the valve body 1, and the first end 101 of the valve body 1 is connected to the external structure. The first sealing ring 3 seals the contact surface between the tail of the breathable valve 100 and the external structure, thereby ensuring the connection sealing between the tail of the breathable valve 100 and the external structure. Figure 8 As shown, when the single-layer seal is damaged or fails, the first sealing ring 3 can serve as the last sealing protection line of the air valve 100, which can prevent water vapor from penetrating into the battery pack through the outside of the air valve 100, thereby better ensuring the working performance of the battery pack.

[0033] In one example, the first sealing ring 3 is installed between the tail of the valve body 1 and an external structure such as a battery pack tray. During the installation process, the first sealing ring 3 extends into the battery pack tray along with the first end 101 of the valve body 1, and is connected and fixed to the battery pack tray through the first end 101 of the valve body 1. The first sealing ring 3 is compressed and sealed between the tail of the breathable valve 100 and the battery pack tray, thereby sealing the tail of the breathable valve 100 and the battery pack tray. In this way, when water vapor penetrates from the outside of the breathable valve 100 to the tail of the breathable valve 100, it is locked by the first sealing ring 3 at the tail, effectively ensuring the sealing performance of the battery pack.

[0034] Therefore, the air valve 100 of the present invention is equipped with a first sealing ring 3 at the tail of the air valve 100. When the single-layer sealing component is damaged or fails, the first sealing ring 3 can serve as the last sealing protection line of the air valve 100, which can prevent water vapor from penetrating into the battery pack through the outside of the air valve 100, thereby better ensuring the sealing performance inside the battery pack.

[0035] According to some embodiments of the present invention, a portion of the first sealing ring 3 extends into the valve body 1 and covers the exhaust opening 103 of the first end 101 of the valve body 1 .

[0036] Reference Figure 4-Figure 10As shown, a portion of the first sealing ring 3 extends into the valve body 1, and a portion is arranged between the tail of the valve body 1 and an external structure such as a battery pack tray. In this way, a portion of the first sealing ring 3 is installed in the valve body 1 through the exhaust opening 103, which can improve the connection reliability between the first sealing ring 3 and the tail of the valve body 1. When the air-permeable valve 100 is not installed in the battery pack tray, the above-mentioned connection method can effectively prevent the first sealing ring 3 from falling off.

[0037] Of course, the present invention is not limited to the above connection method, and the first sealing ring 3 can also be fixedly connected to the tail of the valve body 1 by bonding.

[0038] According to some embodiments of the present invention, the first sealing ring 3 includes a main body 301 and a protrusion 302. The protrusion 302 is arranged to protrude relative to the main body 301 toward the first end 101 of the valve body 1. The main body 301 covers the tail of the first end 101 of the valve body 1, and the protrusion 302 extends into the valve body 1 and has an interference fit with the exhaust opening 103.

[0039] Reference Figure 5 As shown, the main body 301 is provided with a protruding portion 302 toward the first end 101 of the valve body 1, so that the protruding portion 302 extends into the valve body 1 and is interference-fitted with the exhaust opening 103, thereby better improving the connection reliability between the first sealing ring 3 and the valve body 1. The protruding portion 302 can also be further fixed inside the valve body 1 by bonding.

[0040] According to some embodiments of the present invention, the first sealing ring 3 is a high-compression sealing ring.

[0041] It is understandable that the first sealing ring 3 is made of high-compression material, so that when the torque is not in place, the first sealing ring 3 can also form a sealing lock, and effectively compress the tail of the breathable valve 100 to form an unnecessary compression amount with the end of the breathable valve 100.

[0042] According to some embodiments of the present invention, a second sealing ring 4 is disposed on the outer side of the valve body 1 , and the second sealing ring 4 is used to seal the contact surface between the outer side of the breathable valve 100 and the external structure.

[0043] Reference Figure 4-Figure 10 As shown, the first end 101 of the valve body 1 extends into the battery pack tray for installation and fixation, and the second sealing ring 4 is used to seal the contact surface between the outer side of the valve body 1 and the battery pack tray to prevent external impurities from entering the battery pack through the contact gap between the outer periphery of the valve body 1 and the battery pack tray.

[0044] That is, the second sealing ring 4 can serve as the first sealing line of defense on the outside of the air valve 100, and the first sealing ring 3 can serve as the second sealing line of defense on the outside of the air valve 100. When the second sealing ring 4 is damaged and fails, the first sealing ring 3 can lock the water vapor that penetrates from the outside of the valve body 1 to ensure the sealing performance of the battery pack.

[0045] According to an embodiment of the present invention, an external thread 104 is disposed on the outer side of the first end 101 of the valve body 1 , and the second sealing ring 4 is sleeved on an end of the external thread 104 adjacent to the second end 102 of the valve body 1 .

[0046] like Figure 4-Figure 10 In the embodiment shown, the first end 101 of the valve body 1 is threadedly connected to the battery pack tray, and the breathable valve 100 is firmly connected to the battery pack through threaded cooperation, and the breathable valve 100 is convenient for disassembly and replacement. After the breathable valve 100 is connected to the battery pack tray through the external thread 104, the second sealing ring 4 seals the connection between the valve body 1 and the battery pack tray.

[0047] The outer diameter of the first end 101 of the valve body 1 is smaller than the outer diameter of the second end 102 of the valve body 1, and a step is formed between the first end 101 and the second end 102 of the valve body 1. In this way, the first end 101 of the valve body 1 extends into the battery pack tray, and the end of the second end 102 close to the first end 101 abuts against the surface of the battery pack tray.

[0048] According to another embodiment of the present invention, the second sealing ring 4 is partially embedded in the tail of the second end 102 of the valve body 1 and surrounds the outer side of the first end 101 of the valve body 1 .

[0049] In this way, the second sealing ring 4 can also be fixed in the end of the second end 102 of the valve body 1 close to the first end 101. Specifically, an annular groove is provided at the tail of the second end 102 of the valve body 1, and the second sealing ring 4 is partially embedded in the annular groove and partially surrounds the outside of the second end 102 of the valve body 1, which can prevent the second sealing ring 4 from axial movement.

[0050] According to some embodiments of the present invention, the double-layer breathable membrane 2 includes: a first breathable membrane 201 and a second breathable membrane 202 , and the first breathable membrane 201 and the second breathable membrane 202 are spaced apart along the axial direction of the valve body 1 .

[0051] Specifically, after the air valve 100 is installed on the battery pack shell, the first end 101 of the valve body 1 extends into the battery pack shell, and in the vertical axis direction, the first air permeable membrane 201 is located at the outer layer, and dust accumulates on the first air permeable membrane 201. The first air permeable membrane 201 can prevent dust and fine solid particles from entering the air valve 100 and then falling on the second air permeable membrane 202, which can reduce the wear and damage of dust on the second air permeable membrane 202. Therefore, even if the dust accumulated on the first air permeable membrane 201 wears the first air permeable membrane 201, the second air permeable membrane 202 can still play a waterproof and dustproof function, thereby improving the waterproof and dustproof performance of the air valve 100.

[0052] According to some embodiments of the present invention, a first channel 105 and a second channel 106 are formed inside the valve body 1 and penetrate the valve body 1 axially. The first channel 105 and the second channel 106 are connected to form a channel for gas exchange, and the first channel 105 is farther away from the first sealing ring 3 than the second channel 106. The first breathable membrane 201 is fixed in the first channel 105, and the second breathable membrane 202 is fixed in the second channel 106.

[0053] Reference Figure 5 As shown, the first channel 105 and the second channel 106 are sequentially arranged along the axial direction of the breathable valve 100 from the outside to the rear, the first breathable membrane 201 can be fixed in the first channel 105 by hot pressing, as the first sealing line of defense inside the breathable valve 100, and the second breathable membrane 202 can also be fixed in the second channel 106 by hot pressing, as the second sealing line of defense inside the breathable valve 100. Figure 2 and Figure 3 In the failure mode shown, the first breathable membrane 201 and / or the second breathable membrane 202 can prevent external impurities including solid particles and water vapor from entering the battery.

[0054] According to some embodiments of the present invention, the first breathable membrane 201 is fixed inside the end of the second end 102 of the valve body 1 away from the tail of the valve body 1 , and the second breathable membrane 202 is fixed inside the first end 101 of the valve body 1 .

[0055] Reference Figure 5 As shown, the first breathable membrane 201 can be fixed on the inner side of the end of the second end 102 of the valve body 1 away from the first end 101 of the valve body 1, and the second breathable membrane 202 is fixed inside the first end 101 of the valve body 1. When the gas inside the battery pack increases and the internal pressure increases, the gas inside the battery pack passes through the exhaust opening 103 in the valve body 1, and is discharged through the second channel 106 and the first channel 105 in sequence, thereby reducing the pressure inside the battery pack shell and reducing safety risks.

[0056] According to some embodiments of the present invention, a third breathable membrane 5 is provided inside the valve body 1, the double-layer breathable membrane 2 and the third breathable membrane 5 are spaced apart along the axial direction of the valve body 1, and the third breathable membrane 5 is fixed to the inner side of the tail of the valve body 1 and is provided close to the first sealing ring 3.

[0057] Reference Figure 5-Figure 10 As shown, the first breathable membrane 201, the second breathable membrane 202 and the third breathable membrane 5 are sequentially arranged in the axial direction from the outside to the tail of the valve body 1. The third breathable membrane 5 serves as the third sealing defense line inside the breathable valve 100. When the second and third failure modes mentioned above occur, the third breathable membrane 5 can effectively prevent water from entering the valve body 1. When the first breathable membrane 201 at the end fails, water vapor enters through the second breathable membrane 202 and the side channel. Adding the third breathable membrane 5 at the tail of the valve body 1 can achieve secondary locking and effective sealing. The specific failure path is as follows Fig.10 As indicated by the arrow.

[0058] According to some embodiments of the present invention, the air valve 100 further includes a third air permeable membrane support 6, which is installed inside the valve body 1, and a third channel 601 is formed inside the third air permeable membrane support 6 axially penetrating the third air permeable membrane support 6, and the third air permeable membrane 5 is fixed in the third channel 601.

[0059] Reference Figure 5 As shown, the tail of the valve body 1 is sunken inward through the exhaust opening 103 to form a step surface in the second channel 106, so that the third breathable membrane support 6 is fixed at the step surface position, and the third breathable membrane 5 can be fixed in the third channel 601 by hot pressing, which is convenient for disassembly to check whether the third breathable membrane 5 is intact.

[0060] According to some embodiments of the present invention, one axial end of the first sealing ring 3 abuts against the third breathable membrane support 6 , and the inner diameter of the first sealing ring 3 is larger than the diameter of the third channel 601 , ensuring that the breathability function of the third breathable membrane 5 is not affected.

[0061] According to some embodiments of the present invention, the breathable valve 100 further includes: a valve cover 7, which is installed on the end of the second end 102 of the valve body 1 away from the first end 101 of the valve body 1, and a breathable structure 8 is formed between the valve cover 7 and the second end 102 of the valve body 1, and the breathable structure 8 is connected to the inside of the valve body 1 to form a channel for gas exchange.

[0062] The battery pack according to the second embodiment of the present invention includes a battery tray and a vent valve 100, the battery tray is provided with a vent structure 8, the first end 101 of the valve body 1 is embedded in the vent structure 8, and the first sealing ring 3 is adapted to the vent structure 8. It can be understood that the first sealing ring 3 at the tail of the valve body 1 can be designed and adapted according to the profile of the battery pack tray, limited to but not limited to the circular structure shown above, so that the first sealing ring 3 can effectively seal the contact surface between the tail of the valve body 1 and the vent structure 8 of the battery pack tray.

[0063] A vehicle according to an embodiment of the third aspect of the present invention includes a vehicle body and a battery pack, wherein the battery pack is accommodated in the vehicle body.

[0064] The breathable valve 100 according to the embodiment of the present invention has the following effects: by adding the first sealing ring 3 and the third breathable membrane 5 at the tail of the valve body 1, the secondary sealing of the tail of the valve body 1 can be achieved. In the case that the first sealing ring 4, the valve cover 7 and the double-layer breathable membrane 2 inside the breathable valve 100 are all failed, the third breathable membrane 5 at the tail of the breathable valve 100 effectively blocks the internal water vapor intrusion channel, and the water seepage at the outside of the valve body 1 is locked through the first sealing ring 3 at the tail of the breathable valve 100, effectively ensuring the sealing performance. That is, the first sealing ring 3 and the third breathable membrane 5 play a secondary protective role after the breathable valve 100 is damaged during installation, fails during use, and fails in sealing due to the environment.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0067] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vent valve, characterized in that: include: A valve body, wherein a double-layer breathable membrane is arranged inside the valve body, a first sealing ring is arranged at the tail of the first end of the valve body, the first end of the valve body is used to be connected to an external structure, and the first sealing ring is used to seal the contact surface between the tail of the breathable valve and the external structure.

2. The breathable valve according to claim 1, characterized in that: A portion of the first sealing ring extends into the valve body and covers the exhaust opening at the first end of the valve body.

3. The breathable valve according to claim 2, characterized in that: The first sealing ring includes a main body and a protruding portion, wherein the protruding portion is arranged to protrude relative to the main body toward the first end of the valve body, the main body covers the tail of the first end of the valve body, and the protruding portion extends into the valve body and is interference fit with the exhaust opening.

4. The breathable valve according to claim 1, characterized in that: The first sealing ring is a high compression sealing ring.

5. The breathable valve according to claim 1, characterized in that: A second sealing ring is arranged on the outer side of the valve body, and the second sealing ring is used to seal the contact surface between the outer side of the air-permeable valve and the external structure.

6. The breathable valve according to claim 5, characterized in that: An external thread is arranged on the outer side of the first end of the valve body, and the second sealing ring is sleeved on an end of the external thread adjacent to the second end of the valve body.

7. The breathable valve according to claim 5, characterized in that: The outer diameter of the first end of the valve body is smaller than the outer diameter of the second end of the valve body and a step is formed between the first and second ends of the valve body. The second sealing ring is partially embedded in the tail of the second end of the valve body and surrounds the outer side of the first end of the valve body.

8. The breathable valve according to claim 1, characterized in that: The double-layer breathable membrane comprises: a first breathable membrane and a second breathable membrane, and the first breathable membrane and the second breathable membrane are arranged at intervals along the axial direction of the valve body.

9. The breathable valve according to claim 8, characterized in that: A first channel and a second channel are formed inside the valve body and penetrate the valve body axially. The first channel and the second channel are connected to form a channel for gas exchange, and the first channel is farther away from the first sealing ring than the second channel. The first breathable membrane is fixed in the first channel, and the second breathable membrane is fixed in the second channel.

10. The breathable valve according to claim 8, characterized in that: The first air-permeable membrane is fixed to the end of the second end of the valve body away from the tail of the valve body, and the second air-permeable membrane is fixed to the inside of the first end of the valve body.

11. The breathable valve according to claim 1, characterized in that: A third breathable membrane is arranged inside the valve body, the double-layer breathable membrane and the third breathable membrane are arranged spaced apart along the axial direction of the valve body, and the third breathable membrane is fixed to the inner side of the tail of the first end of the valve body and is arranged close to the first sealing ring.

12. The breathable valve according to claim 11, characterized in that: It also includes a third breathable membrane support, which is installed inside the valve body. A third channel is formed inside the third breathable membrane support and penetrates the third breathable membrane support along the axial direction. The third breathable membrane is fixed in the third channel.

13. The breathable valve according to claim 12, characterized in that: One axial end of the first sealing ring abuts against the third breathable membrane support, and the inner diameter of the first sealing ring is greater than the diameter of the third channel.

14. The breathable valve according to claim 1, characterized in that: Also includes: A valve cover is installed on the end of the second end of the valve body away from the tail of the valve body, and a breathable structure is formed between the valve cover and the second end of the valve body. The breathable structure is connected to the inside of the valve body to form a channel for gas exchange.

15. A battery pack, characterized in that: It comprises a battery tray and a breathable valve as described in any one of claims 1 to 14, wherein the battery tray is provided with a breathable structure, the first end of the valve body is embedded in the breathable structure, and the first sealing ring is adapted to the breathable structure.

16. A vehicle, characterized in that: It comprises a vehicle body and a battery pack as claimed in claim 15, wherein the battery pack is accommodated in the vehicle body.

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