Waterproof ventilation valve and battery

Abstract

The waterproof ventilation valve comprises a valve body, a waterproof ventilation assembly and a main piston, a first end plate and a second end plate are arranged at the two ends of the valve body in the first direction respectively, a first air port is formed in the first end plate, a second air port is formed in the second end plate, and the waterproof ventilation assembly comprises a waterproof ventilation film. The waterproof breathable film covers the first air port in a sealing mode, the main piston is movably installed in the valve body in the first direction, the interior of the valve body is divided into a first space and a second space in the first direction, and a first ventilation gap is formed between the main piston and the valve body. According to the waterproof ventilation valve disclosed by the utility model, the main piston is arranged in the valve body, so that ventilation of the battery can be effectively ensured, and air outside the battery can be effectively blocked when air does not need to be fed into or discharged from the battery, so that the gas environment in the battery is protected, and stable operation of the battery is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, in particular to a waterproof and breathable valve and a battery. Background Art

[0002] The battery pack of new energy vehicles has the requirements of being waterproof and breathable. When the temperature changes, the gas in the battery pack will exhaust or take in air due to thermal expansion and contraction. However, as the air enters the battery pack, water vapor will be brought into the battery pack, which is not conducive to the insulation and corrosion protection of the battery pack. The battery in the related technology is provided with a waterproof and breathable membrane, so that the battery has a waterproof and breathable function, but the gas can pass through the waterproof and breathable membrane freely without hindrance. External environmental parameters such as temperature and air pressure can easily affect the gas environment inside the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a waterproof and breathable valve, which can protect the gas environment in the battery and is conducive to the stable operation of the battery.

[0004] According to the embodiment of the utility model, the waterproof breathable valve includes: a valve body, the two ends of the valve body in a first direction are respectively a first end plate and a second end plate, the first end plate is provided with a first air port, and the second end plate is provided with a second air port; a waterproof breathable component, the waterproof breathable component includes a waterproof breathable membrane, and the waterproof breathable membrane covers the first air port; a main piston, the main piston is movably mounted in the valve body along a first direction, and separates a first space and a second space in the valve body in the first direction, and a first ventilation gap is provided between the main piston and the valve body.

[0005] According to the waterproof breathable valve of the embodiment of the utility model, by arranging a waterproof breathable membrane at the first air port, it is possible to better block moisture in the air from entering the battery, thereby effectively protecting the insulation of the battery and reducing the risk of the battery being corroded by moisture. By arranging a main piston in the valve body, it is possible to effectively ensure the ventilation of the battery while effectively blocking the air outside the battery when the battery does not need to take in or exhaust air, thereby protecting the gas environment inside the battery and facilitating the stable operation of the battery.

[0006] In addition, the waterproof breathable valve according to the utility model also has the following additional technical features:

[0007] In some embodiments of the utility model, a protrusion is provided on the outer side surface of the first end plate, and the first air port is provided on the protrusion. The waterproof and breathable component also includes a protective cover, which covers the first air port and constructs a bent air passage between the protective cover and the protrusion to communicate with the first air port.

[0008] In some embodiments of the utility model, the waterproof breathable valve further includes: a first elastic member and a second elastic member, wherein the first elastic member is arranged between the main piston and the first end plate, and the second elastic member is arranged between the main piston and the second end plate.

[0009] In some embodiments of the utility model, a first seal is arranged between the valve body and the main piston, and the first seal is used to close the first ventilation gap; a first sliding channel is arranged on the main piston and passes through the main piston along a first direction, and the waterproof breathable valve also includes a first piston, which is installed in the first sliding channel and is suitable for moving along the first direction to open or close the first sliding channel.

[0010] In some embodiments of the utility model, the first piston includes: a first piston plate, a second piston plate and a first piston shaft connected between the first piston plate and the second piston plate, the first piston shaft passes through the first sliding channel, and has a second ventilation gap between the first piston plate and the first sliding channel, the first piston plate and the second piston plate are respectively arranged on both sides of the first direction of the main piston, a second sealing member is arranged on the side of the first piston plate facing the main piston, a third elastic member is arranged between the second piston plate and the main piston, and the third elastic member is used to keep the first piston plate and the main piston in abutment state, wherein in the first direction, the size of the first piston shaft is larger than the size of the first sliding channel.

[0011] In some embodiments of the utility model, the first piston has a sliding groove opening toward the first end plate, at least a portion of the second piston plate is constructed as the bottom wall of the sliding groove, and a second sliding channel penetrating the bottom wall is provided on the second piston plate. The waterproof breathable valve also includes a second piston, and the second piston is slidably disposed in the second sliding channel for opening or closing the second sliding channel.

[0012] In some embodiments of the present invention, the second piston includes: a third piston plate, a fourth piston plate and a second piston shaft connected between the third piston plate and the fourth piston plate, the third piston is located in the sliding groove, the second piston shaft passes through the second sliding channel, and a third ventilation gap is constructed between the second sliding channel, the fourth piston plate is arranged on the side of the second piston plate away from the second sliding channel, a fourth elastic member is arranged between the third piston plate and the second piston plate, a third sealing member is arranged on the side of the fourth piston plate facing the second piston plate, and the fourth elastic member is used to keep the fourth piston plate and the second piston plate in abutment state, wherein in the first direction, the size of the second piston shaft is larger than the size of the second sliding channel.

[0013] In some embodiments of the utility model, the first end plate is provided with a first top column, the first top column is opposite to the sliding groove and can slide with the sliding groove; the second end plate is provided with a second top column, the second top column is opposite to the second piston plate, and the second top column is a ring shape surrounding the outer peripheral side of the fourth piston plate.

[0014] In some embodiments of the present invention, the valve body, the main piston, the first piston and the second piston are all coaxially arranged.

[0015] The utility model also provides a battery with the waterproof and breathable valve of the above embodiment.

[0016] According to the battery of the utility model, by providing the waterproof breathable valve of the above embodiment and by providing a waterproof breathable membrane at the first air port, moisture in the air can be better blocked from entering the battery, thereby effectively protecting the insulation of the battery and reducing the risk of the battery being corroded by moisture. By providing a main piston in the valve body, the ventilation of the battery can be effectively ensured while effectively blocking the air outside the battery when the battery does not need to take in or exhaust air, thereby protecting the gas environment inside the battery and facilitating the stable operation of the battery.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 It is a schematic structural diagram of a waterproof breathable valve according to an embodiment of the utility model.

[0020] Figure 2 It is a structural schematic diagram of a waterproof breathable valve according to an embodiment of the utility model at one angle.

[0021] Figure 3 yes Figure 2 Sectional view along line AA.

[0022] Figure 4 yes Figure 3 Magnified view of area B.

[0023] Figure 5 yes Figure 3 Magnified view of area C.

[0024] Figure 6 It is a schematic structural diagram of the waterproof breathable valve according to another angle of the embodiment of the utility model.

[0025] Figure 7 yes Figure 6 Cross-sectional view along line DD.

[0026] Reference numerals:

[0027] Waterproof breathable valve 100,

[0028] Valve body 1, first end plate 11, first air port 111, first top column 112, second end plate 12, second air port 121, second top column 122, first space 13, second space 14, first ventilation gap 15,

[0029] Waterproof breathable component 2, protective cover 21, air duct 22,

[0030] The main piston 31, the first sliding channel 311, the first elastic member 32, the second elastic member 33, the first sealing member 34,

[0031] The first piston 35, the first piston plate 351, the second piston plate 352, the first piston shaft 353, the sliding groove 355, the second sliding channel 356,

[0032] The second sealing member 36, the third elastic member 37,

[0033] The second piston 38, the third piston plate 381, the fourth piston plate 382, ​​the second piston shaft 383,

[0034] The fourth elastic member 39 and the third sealing member 40 . DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Reference below Figure 1-Figure 7 A waterproof breathable valve 100 according to an embodiment of the present invention is described.

[0039] like Figure 1-Figure 7 As shown, the waterproof breathable valve 100 according to the embodiment of the utility model includes a valve body 1, a waterproof breathable component 2 and a main piston 31. The two ends of the valve body 1 in the first direction are respectively a first end plate 11 and a second end plate 12. The first end plate 11 is provided with a first air port 111, and the second end plate 12 is provided with a second air port 121. Here, the first direction can refer to Figure 3 In the left and right directions shown, exemplarily, the first air port 111 is an air inlet, and the second air port 121 is an air exhaust port, so that air can enter the valve body 1 from the first air port 111, and then be discharged from the second air port 121. It can be understood that the first air port 111 can also be an exhaust port, and the second air port 121 can also be an air inlet, and this application does not impose any limitations.

[0040] Furthermore, the waterproof breathable component 2 includes a waterproof breathable membrane, which covers the first air port 111. The waterproof breathable membrane is a polymer material with a special microporous structure, which can achieve the barrier of liquid moisture and the permeation of gas (especially air), thereby achieving both waterproof and breathable effects. Exemplarily, the first air port 111 is an air inlet, and the second air port 121 is an exhaust port. When air enters the valve body 1 from the first air port 111, the waterproof breathable membrane can better block the moisture in the air from entering the valve body 1, and can better protect the valve body 1. It can be understood that when the waterproof breathable valve 100 of the present application is applied to a battery, the provision of a waterproof breathable membrane can better reduce the moisture in the air from entering the battery from the waterproof breathable valve 100, thereby better protecting the battery.

[0041] Furthermore, if Figure 3 and Figure 7 As shown, the main piston 31 is movably installed in the valve body 1 along the first direction, and a first space 13 and a second space 14 are separated in the valve body 1 in the first direction, and a first ventilation gap 15 is provided between the main piston 31 and the valve body 1. Exemplarily, the waterproof breathable valve 100 is applied to a battery, which may be a battery on a new energy vehicle. It should be noted that when the temperature of the battery changes, the gas in the battery will be exhausted or inhaled due to thermal expansion and contraction. The battery in the related art is provided with a waterproof breathable membrane, so that the battery has a waterproof and breathable function, but the gas can freely pass through the waterproof breathable membrane without any obstruction. On the one hand, external environmental parameters such as temperature and air pressure are easy to affect the gas environment in the battery. The present application sets a main piston 31 that can move along the first direction in the valve body 1. For example, when the battery needs to inhale air in a cold contraction state, the air in the second space 14 can directly enter the battery. At this time, the air pressure in the second space 14 is reduced, so that the main piston 31 moves toward the second space 14. At this time, the air pressure in the first space 13 is reduced, and the external air can enter the first space 13 from the first air port 111. After the air can enter the valve body 1 from the first air port 111, the air pressure in the first space 13 can be increased. The air in the first space 13 can enter the second space 14 from the first ventilation gap 15, and then can enter the battery from the second space 14, thereby effectively providing gas to the battery and effectively reducing the influence of the air pressure during air intake on the gas environment inside the battery.

[0042] Similarly, when the battery needs to be exhausted in a thermally expanded state, the air in the battery can enter the second space 14 from the second air port 121, so that the air pressure in the second space 14 increases, so that the main piston 31 moves toward the first space 13, thereby buffering the air in the valve body 1, and the air in the second space 14 can enter the first space 13 from the first ventilation gap 15, and then can be discharged through the first air port 111, thereby making the air pressure inside and outside the battery more stable, thereby better ensuring the stable operation of the battery.

[0043] When the battery does not need to be inlet or outlet, the air outside the battery is not easy to enter the battery due to the obstruction of the main piston 31 in the valve body 1, and it is not easy to affect the gas environment in the battery. Therefore, the waterproof breathable valve 100 of the utility model can effectively ensure the ventilation of the battery, and effectively block the air outside the battery when the battery does not need to be inlet or outlet, thereby protecting the gas environment in the battery, which is conducive to the stable operation of the battery.

[0044] Therefore, according to the waterproof breathable valve 100 of the embodiment of the utility model, by arranging a waterproof breathable membrane at the first air port 111, it is possible to better block moisture in the air from entering the battery, thereby effectively protecting the insulation of the battery, and reducing the risk of the battery being corroded by moisture. By arranging a main piston 31 in the valve body 1, it is possible to effectively ensure the ventilation of the battery while effectively blocking the air outside the battery when the battery does not need to take in or exhaust air, thereby protecting the gas environment inside the battery, which is beneficial to the stable operation of the battery.

[0045] In some embodiments of the present invention, Figure 1-Figure 4 As shown, a protrusion is provided on the outer side of the first end plate 11, and a first air port 111 is provided on the protrusion. The waterproof breathable component 2 also includes a protective cover 21, which covers the first air port 111 and constructs a curved airway 22 connected to the first air port 111 between the protective cover 21 and the protrusion.

[0046] According to the waterproof breathable valve 100 of the embodiment of the utility model, by providing a protective cover 21, the waterproof breathable membrane can be better protected, the damage of the waterproof breathable membrane can be reduced, and the service life of the waterproof breathable membrane can be extended. By constructing a bent airway 22 between the protective cover 21 and the protrusion, a certain obstruction to the entry of air can be formed to a certain extent. On the one hand, it can prevent external air from directly impacting the waterproof breathable membrane. On the other hand, it can also block the air outside the battery when the battery does not need to take in or exhaust air, thereby protecting the gas environment inside the battery, which is beneficial to the stable operation of the battery.

[0047] In some embodiments of the present invention, Figure 3-Figure 7As shown, the waterproof breathable valve 100 further includes a first elastic member 32 and a second elastic member 33. The first elastic member 32 is arranged between the main piston 31 and the first end plate 11, and the second elastic member 33 is arranged between the main piston 31 and the second end plate 12. By arranging the first elastic member 32 and the second elastic member 33, the waterproof breathable valve 100 can be stably located in the middle position of the valve body 1, which can be conducive to making the first space 13 and the second space 14 constructed by the main piston 31 in the valve body 1 more stable. The first elastic member 32 and the second elastic member 33 can both be springs, or other elastic structures, such as springs or sponges, etc. The present application does not limit the structures of the first elastic member 32 and the second elastic member 33, nor does it limit the materials of the first elastic member 32 and the second elastic member 33.

[0048] In some embodiments of the present invention, Figure 3-Figure 7 As shown, a first sealing member 34 is provided between the valve body 1 and the main piston 31, and the first sealing member 34 is used to close the first ventilation gap 15; a first sliding channel 311 is provided on the main piston 31 and penetrates the main piston 31 along a first direction, and the waterproof breathable valve 100 also includes a first piston 35, which is installed in the first sliding channel 311 and is suitable for moving along the first direction to open or close the first sliding channel 311.

[0049] That is to say, in this example, when the battery needs to take in air or exhaust air, the air may not pass through the first ventilation gap 15. For example, the battery needs to take in air, and the air pressure in the second space 14 is reduced. Under the negative pressure state of the second space 14, the main piston 31 can be driven to move and the first piston 35 can be driven to open the first sliding channel 311. At this time, the air in the first space 13 can enter the second space 14, and the external air can enter the first space 13, thereby forming a complete gas circulation.

[0050] Exemplarily, when the battery needs to be exhausted, the first piston 35 may also open the first sliding channel 311, which is not limited in the present application.

[0051] In some embodiments of the present invention, Figure 3-Figure 7As shown, the first piston 35 includes a first piston plate 351, a second piston plate 352 and a first piston shaft 353 connected between the first piston plate 351 and the second piston plate 352, the first piston shaft 353 passes through the first sliding channel 311, and has a second ventilation gap between the first piston plate 351 and the first sliding channel 311, the first piston plate 351 and the second piston plate 352 are respectively arranged on both sides of the first direction of the main piston 31, the second sealing member 36 is arranged on the side of the first piston plate 351 facing the main piston 31, and a third elastic member 37 is arranged between the second piston plate 352 and the main piston 31, and the third elastic member 37 is used to keep the first piston plate 351 and the main piston 31 in abutment state, wherein in the first direction, the size of the first piston shaft 353 is larger than the size of the first sliding channel 311.

[0052] Exemplarily, the battery needs to inhale air, and the air pressure in the second space 14 decreases. Under the negative pressure state of the second space 14, the main piston 31 can be driven to move toward the second end plate 12. When the first piston 35 abuts the second end plate 12, the main piston 31 can continue to move toward the second end plate 12. As a result, the first piston 35 moves toward the first end plate 11 relative to the main piston 31 under the extrusion action, thereby opening the second ventilation gap, and the air in the first space 13 can enter the second space 14 along the second ventilation gap. When the air pressure inside and outside the battery is stable, under the elastic action of the third elastic member 37, the first piston plate 351 can be in abutment with the main piston 31 again. At this time, the second sealing member 36 can seal the gap between the first piston plate 351 and the main piston 31, thereby making the first space 13 and the second space 14 relatively sealed, and then making the battery relatively sealed, which can reduce the impact of the external environment on the battery.

[0053] Alternatively, if Figure 3-Figure 7 As shown, a second push column 122 may be provided on the second end plate 12 so that the first piston 35 can better open the second ventilation gap.

[0054] In some embodiments of the present invention, Figure 3-Figure 7 As shown, the first piston 35 has a sliding groove 355 opening toward the first end plate 11, at least a portion of the second piston plate 352 is constructed as the bottom wall of the sliding groove 355, and the second piston plate 352 is provided with a second sliding channel 356 penetrating the bottom wall. The waterproof breathable valve 100 also includes a second piston 38, which is slidably disposed in the second sliding channel 356 for opening or closing the second sliding channel 356.

[0055] Alternatively, if Figure 3-Figure 7As shown, the second piston 38 includes: a third piston plate 381, a fourth piston plate 382 and a second piston shaft 383 connected between the third piston plate 381 and the fourth piston plate 382, ​​the third piston is located in the sliding groove 355, the second piston shaft 383 passes through the second sliding channel 356, and a third ventilation gap is constructed between the second sliding channel 356, the fourth piston plate 382 is arranged on the side of the second piston plate 352 away from the second sliding channel 356, a fourth elastic member 39 is arranged between the third piston plate 381 and the second piston plate 352, and a third sealing member 40 is arranged on the side of the fourth piston plate 382 facing the second piston plate 352, and the fourth elastic member 39 is used to keep the fourth piston plate 382 and the second piston plate 352 in abutment, wherein in the first direction, the size of the second piston shaft 383 is larger than the size of the second sliding channel 356.

[0056] Exemplarily, when the battery needs to be exhausted, the air pressure in the second space 14 increases, and under the positive pressure state of the second space 14, the main piston 31 can be driven to move toward the first end plate 11. When the first piston 35 abuts against the first end plate 11, the main piston 31 can continue to move toward the first end plate 11. At this time, the second piston 38 can move toward the second end plate 12 relative to the second piston 38 and the main piston 31 under the extrusion action, thereby opening the third ventilation gap, and the air in the second space 14 can enter the first space 13 along the third ventilation gap. When the air pressure inside and outside the battery is stable, under the action of the fourth elastic member 39, the fourth piston plate 382 can remain in an abutment state with the second piston plate 352, thereby making the first space 13 and the second space 14 relatively sealed, and then making the battery relatively sealed, which can reduce the impact of the external environment on the battery.

[0057] Alternatively, if Figure 3-Figure 7 As shown, the first end plate 11 is provided with a first top column 112 , which is opposite to the sliding groove 355 and can slide with the sliding groove 355 , thereby enabling the second piston 38 to better open the third ventilation gap.

[0058] Alternatively, if Figure 3-Figure 7 As shown, the second end plate 12 is provided with a second top column 122, which is opposite to the second piston plate 352. The second top column 122 is annular and surrounds the outer peripheral side of the fourth piston plate 382, ​​so that the first piston 35 can better open the second ventilation gap.

[0059] In some embodiments of the present invention, Figure 3-Figure 7 As shown, the valve body 1 , the main piston 31 , the first piston 35 and the second piston 38 are all coaxially arranged, so that the main piston 31 , the first piston 35 and the second piston 38 can be relatively stable when moving in the valve body 1 .

[0060] Optionally, the first gas port 111 is located at a position of the first end plate 11 that is offset from the axis.

[0061] The utility model also provides a battery having the waterproof breathable valve 100 of the above embodiment.

[0062] According to the battery of the utility model, by providing the waterproof breathable valve 100 of the above embodiment and by providing a waterproof breathable membrane at the first air port 111, moisture in the air can be better blocked from entering the battery, thereby effectively protecting the insulation of the battery and reducing the risk of the battery being corroded by moisture. By providing the main piston 31 in the valve body 1, the ventilation of the battery can be effectively ensured while effectively blocking the air outside the battery when the battery does not need to take in or exhaust air, thereby protecting the gas environment in the battery and facilitating the stable operation of the battery.

[0063] Other structures and operations of the waterproof breathable valve 100 and the battery according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0064] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate 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 waterproof breathable valve, characterized in that: include: A valve body, wherein two ends of the valve body in a first direction are respectively a first end plate and a second end plate, the first end plate is provided with a first gas port, and the second end plate is provided with a second gas port; A waterproof breathable component, the waterproof breathable component comprising a waterproof breathable membrane, the waterproof breathable membrane covers the first air port; A main piston is movably mounted in the valve body along a first direction and separates a first space and a second space in the valve body in the first direction, and a first ventilation gap is provided between the main piston and the valve body.

2. The waterproof breathable valve according to claim 1, characterized in that: The outer side surface of the first end plate is provided with a protrusion, and the first air port is provided on the protrusion. The waterproof and breathable component also includes a protective cover, which covers the first air port and constructs a bent airway connected to the first air port between the protective cover and the protrusion.

3. The waterproof breathable valve according to claim 1, characterized in that: Also includes: A first elastic member and a second elastic member, wherein the first elastic member is disposed between the main piston and the first end plate, and the second elastic member is disposed between the main piston and the second end plate.

4. The waterproof breathable valve according to claim 1, characterized in that: A first seal is provided between the valve body and the main piston, and the first seal is used to close the first ventilation gap; a first sliding channel is provided on the main piston and penetrates the main piston along a first direction, and the waterproof breathable valve also includes a first piston, which is installed in the first sliding channel and is suitable for moving along the first direction to open or close the first sliding channel.

5. The waterproof breathable valve according to claim 4, characterized in that: The first piston comprises: A first piston plate, a second piston plate and a first piston shaft connected between the first piston plate and the second piston plate, the first piston shaft passes through the first sliding channel and has a second ventilation gap between the first piston plate and the first sliding channel, the first piston plate and the second piston plate are respectively arranged on both sides of the first direction of the main piston, a second sealing member is arranged on the side of the first piston plate facing the main piston, a third elastic member is arranged between the second piston plate and the main piston, and the third elastic member is used to keep the first piston plate and the main piston in abutment state, wherein in the first direction, the size of the first piston shaft is larger than the size of the first sliding channel.

6. The waterproof breathable valve according to claim 5, characterized in that: The first piston has a sliding groove opening toward the first end plate, at least a portion of the second piston plate is constructed as the bottom wall of the sliding groove, and a second sliding channel penetrating the bottom wall is provided on the second piston plate. The waterproof breathable valve also includes a second piston, which is slidably disposed in the second sliding channel for opening or closing the second sliding channel.

7. The waterproof breathable valve according to claim 6, characterized in that: The second piston comprises: A third piston plate, a fourth piston plate and a second piston shaft connected between the third piston plate and the fourth piston plate, the third piston is located in the sliding groove, the second piston shaft passes through the second sliding channel, and a third ventilation gap is constructed between the second sliding channel, the fourth piston plate is arranged on the side of the second piston plate away from the second sliding channel, a fourth elastic member is arranged between the third piston plate and the second piston plate, a third sealing member is arranged on the side of the fourth piston plate facing the second piston plate, and the fourth elastic member is used to keep the fourth piston plate and the second piston plate in abutment state, wherein in the first direction, the size of the second piston shaft is larger than the size of the second sliding channel.

8. The waterproof breathable valve according to claim 7, characterized in that: The first end plate is provided with a first top column, the first top column is opposite to the sliding groove and can be slidably matched with the sliding groove; The second end plate is provided with a second top column, the second top column is opposite to the second piston plate, and the second top column is in a ring shape surrounding the outer peripheral side of the fourth piston plate.

9. The waterproof breathable valve according to claim 6, characterized in that: The valve body, the main piston, the first piston and the second piston are all coaxially arranged.

10. A battery, characterized in that: The waterproof breathable valve comprises the waterproof breathable valve according to any one of claims 1 to 9.

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