CN220272689U - Explosion-proof valve and battery thereof - Google Patents

Abstract

The utility model discloses an explosion-proof valve and a battery thereof, the explosion-proof valve comprises a valve body, a piston assembly, a valve cover and an elastic member, wherein a supporting member is arranged in the valve body, an opening is formed between the supporting member and the valve body, the piston assembly is movably arranged on the valve body and covers the opening, the explosion-proof valve comprises two exhaust channels, the exhaust channels are communicated with the opening, the valve cover is arranged on the piston assembly, at least one exhaust port is arranged on the side wall of the valve cover, the elastic member is arranged on the piston assembly, one end of the elastic member is fixedly connected with the inner wall of the supporting member, the other end of the elastic member is fixedly connected with the piston assembly, a gap is arranged between the exhaust port and the side wall of the valve body, an inner shielding sheet is locally arranged at the first end of the exhaust channel, an outer shielding sheet is locally arranged at the second end of the exhaust channel, and a waterproof and breathable film is arranged between the valve cover and the piston. According to the utility model, the normal exhaust requirement of the battery is met, the internal and external pressure of the battery can be automatically balanced, and the battery can be rapidly exhausted when abnormal, so that the service life of the battery is prolonged.

Description

Explosion-proof valve and battery thereof

Technical Field

The utility model relates to the technical field of explosion-proof valves, in particular to an explosion-proof valve and a battery thereof.

Background

With the popularization and development of new energy steam technology, battery safety is receiving more and more attention. The battery is used as a power source, and a large amount of chemical substances are filled in the battery; the battery can produce the gaseous mixture in normal course of working, and the battery needs to carry out normal exhaust, if pressure is not released in time, serious can influence battery life, probably explosion even.

At present, an explosion-proof valve is usually arranged on a battery, gas is released through an exhaust port of the explosion-proof valve, but in the transportation process of energy equipment with the battery, high-low altitude pressure difference is easily generated due to the influence of environment, negative pressure difference can be generated in the battery, and the battery also needs to balance internal and external pressure differences in time.

Accordingly, the prior art is still in need of improvement and development.

Disclosure of Invention

The utility model aims to solve the technical problems that aiming at the defects in the prior art, an explosion-proof valve and a battery thereof are provided, and aims to solve the problem that the explosion-proof valve in the prior art cannot automatically balance the pressure difference inside the battery.

The technical scheme adopted for solving the technical problems is as follows:

an explosion protection valve comprising:

a valve body in which a support member is disposed, an opening being formed between the support member and an inside of the valve body;

the piston assembly is movably arranged on the supporting member and covers the opening, and comprises two exhaust channels which are communicated with the opening;

the valve cover is arranged on the piston assembly, at least one exhaust port is arranged on the side wall of the valve cover, and the exhaust port is communicated with the exhaust channel;

the elastic component is arranged on the piston component, one end of the elastic component is fixedly connected with the inner wall of the supporting component, and the other end of the elastic component is fixedly connected with the piston component;

a gap is arranged between the exhaust port and the side wall of the valve body;

an inner shielding sheet is locally arranged at the first end of one of the exhaust channels;

an outer shielding sheet is arranged at the second end of the other exhaust channel locally;

a waterproof and breathable film is arranged between the valve cover and the piston.

Optionally, the inner shielding sheet is one of a plastic inner shielding sheet, a rubber inner shielding sheet and an elastic metal inner shielding sheet, and the outer shielding sheet is one of a plastic outer shielding sheet, a rubber outer shielding sheet and an elastic metal outer shielding sheet.

Optionally, the piston assembly includes:

the guide rod component is movably arranged on the supporting component;

a piston member fixed to a first end of the guide rod member;

wherein the second end of the guide rod member is provided with the elastic member;

the piston member is provided with the exhaust passage;

the piston member is provided with the waterproof and breathable film and the valve cover.

Optionally, the valve cover is fixed to the piston member by welding, bonding or clamping.

Optionally, the piston assembly further includes a magnetic valve core member disposed at the first end of the piston member, and the magnetic valve core member is detachably connected with the guide rod member.

Optionally, a magnetic reinforcing part is disposed on the magnetic valve core member.

Optionally, the valve body is of a bolt-shaped structure, and flat parts are arranged on two sides of the valve body.

Optionally, a first sealing ring is arranged at the communication part of the valve body and the battery.

Optionally, a second sealing ring is arranged between the valve body and the piston assembly.

A battery comprising an explosion-proof valve according to any one of the above claims.

The beneficial effects are that:

1. in the utility model, when the internal pressure of the battery is greater than the external environmental pressure, the pressure in the battery pushes the outer shielding sheet to open, gas is discharged from the battery through the exhaust channel, the waterproof breathable film and the exhaust port where the outer shielding sheet is positioned, and the outer shielding sheet is automatically closed after the exhaust is finished; at this time, only one exhaust passage is opened, the exhaust amount is small, the normal exhaust requirement of the battery can be met, and the waterproof breathable film can also play a certain role in dust prevention and water prevention.

2. In the utility model, when the internal pressure of the battery is smaller than the external environmental pressure, the external environmental pressure pushes the inner shielding plate to open, and gas enters the battery from the external environment through the gap, the exhaust port, the waterproof breathable film and the exhaust channel where the inner shielding plate is positioned, so as to automatically supplement pressure in the battery, and the inner shielding plate can be automatically closed after the pressure supplement is finished.

3. In the utility model, when the pressure in the battery is greater than the external environment pressure and the pressure in the battery is greater than the elastic potential energy of the elastic member, the pressure pushes the piston assembly to move upwards along the supporting member, the elastic member is compressed to store the elastic potential energy, the piston assembly does not shade the opening, the gas is directly discharged through the opening and the gap, and the two exhaust channels are in a closed state; at this time, the exhaust amount increases due to the large area of the opening, and the requirement of rapid exhaust under abnormal conditions of the battery can also be satisfied.

4. In the utility model, not only can the normal exhaust requirement of the battery be met, but also the requirement of the battery for automatically balancing the internal pressure difference and the external pressure difference can be met, and in addition, when the battery is in an abnormal state, the large-displacement exhaust can be realized, so that the battery is prevented from being damaged, and the service life of the battery is prolonged.

Drawings

FIG. 1 is a schematic view of the overall structure of the valve body of the present utility model;

FIG. 2 is a schematic cross-sectional view of the valve body of the present utility model;

FIG. 3 is a schematic view of an exploded construction of the valve body of the present utility model;

FIG. 4 is a schematic view of the internal structure of the valve body of the present utility model;

FIG. 5 is a schematic structural view of the piston assembly of the present utility model;

FIG. 6 is a schematic structural view of the pilot member and the magnetic spool member of the present utility model;

FIG. 7 is a first schematic representation of the gas flow direction of the present utility model;

FIG. 8 is a second schematic view of the gas flow direction of the present utility model;

fig. 9 is a third structural schematic diagram of the gas flow direction of the present utility model.

Reference numerals illustrate:

100. a valve body; 110. a threaded portion; 1101. a flat portion; 120. an abutting portion; 130. a hand-held part; 140. a support member; 150. an opening; 200. a valve cover; 210. an exhaust port; 220. a clamping block; 300. a piston assembly; 310. a guide rod member; 3101. a base section; 3102. a movable section; 3103. a connection section; 320. a magnetic valve core member; 3201. a magnetic reinforcing part; 330. a piston member; 3301. an exhaust passage; 3302. a groove; 3303. a notch; 3303a, second card interface; 3303b, a first card interface; 3304. a recessed portion; 400. an elastic member; 500. an inner shielding sheet; 600. a waterproof breathable film; 700. an outer shielding sheet; 800. a second seal ring; 900. a first seal ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more clear and clear, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The explosion-proof valve in the prior art can only be suitable for the normal exhaust requirement of the battery, can not exhaust a large amount of gas rapidly in the abnormal state of the battery, and the service life of the battery can be influenced if the gas is not discharged in time; in addition, during the transportation process, the battery is easy to generate pressure difference, the pressure difference cannot be balanced automatically, and the service life of the battery is also influenced.

The utility model is mainly used in the field of new energy, and is particularly applied to new energy batteries.

As shown in fig. 1 to 6, the explosion-proof valve comprises a valve body 100, a piston assembly 300, a valve cover 200 and an elastic member 400, wherein a supporting member 140 is arranged in the valve body 100, an opening 150 is formed between the supporting member 140 and the valve body 100, the piston assembly 300 is movably arranged on the valve body 100 and covers the opening 150, the explosion-proof valve comprises two exhaust channels 3301, the exhaust channels 3301 are communicated with the opening 150, the valve cover 200 is arranged on the piston assembly, at least one exhaust port 210 is arranged on the side wall of the valve cover 200, the elastic member 400 is arranged on the piston assembly, one end of the elastic member is fixedly connected with the inner wall of the supporting member 140, the other end of the elastic member is fixedly connected with the piston assembly, a gap is formed between the exhaust port 210 and the side wall of the valve body 100, an inner shielding piece 500 is partially arranged at a first end of one of the exhaust channels 3301, an outer shielding piece 700 is partially arranged at a second end of the other exhaust channel 3301, and a waterproof and breathable film 600 is arranged between the valve cover 200 and the piston.

Specifically, the valve body 100 has a hollow structure inside, and the valve body 100 is used for connecting with a charging and discharging port of a battery. The middle part of the valve body 100 is provided with a supporting member 140, the supporting member 140 comprises a collar and connecting rods, three connecting rods are mounted on the periphery of the collar, the other ends of the connecting rods are fixedly connected with the side wall of the valve body 100, such as welding and bonding, so that an opening 150 is formed between the supporting member 140 and the valve body 100, the supporting member 140 is divided into two sections, one section at the lower part is used for connecting the inside of a battery, and the other section at the upper part is used for mounting the piston assembly 300. It will be appreciated that the first end of the exhaust channel 3301 refers to the bottom of the exhaust channel 3301, the second end of the exhaust channel 3301 refers to the bottom of the exhaust channel 3301, the inner shielding sheet 500 is mounted at the bottom of one of the exhaust channels 3301, and the outer shielding sheet 700 is mounted at the top of the other exhaust channel 3301; notably, both the inner and outer barrier sheets 500 and 700 are locally fixed to the exhaust passage 3301 (i.e., the piston assembly 300), and the local fixation may be considered as fixing only one side (incompletely fixing) so that the inner and outer barrier sheets 500 and 700 can be opened or closed, thereby making the exhaust passage 3301 conductive or closed; in addition, the inner shielding plate 500 and the outer shielding plate 700 are opened in one direction on the two exhaust passages 3301, that is, the inner shielding plate 500 can only be opened downwards, gas is input into the battery, the outer shielding plate 700 can only be opened upwards, and the gas in the battery is released to the outside. The waterproof and breathable film 600 is installed between the valve cover 200 and the piston assembly 300, and the waterproof and breathable film 600 can play a certain role in dust prevention and water prevention.

Preferably, the elastic member 400 is an elastic spring for pushing the piston assembly 300 upward or downward on the support member 140 by elastic potential energy and automatically restoring it.

Further, as shown in fig. 3 and 5, the valve cover 200 has a disc structure, and the lower part of the valve cover 200 is hollowed out; preferably, four second exhaust ports 210 are uniformly distributed on the sidewall, and the angular interval between each second exhaust port 210 is 90 degrees, and the amount of gas exhaust is further increased by providing a plurality of second exhaust ports 210. In addition, the number of the exhaust ports 210 may be plural, for example, 5, 6, etc., but at least 1, and a person skilled in the art may select a suitable number of the exhaust ports 210 according to actual needs, and it should be noted that, the larger the number of the exhaust ports 210, the more the gas release amount in the battery, the faster the release speed, the more the external gas entering amount, and the corresponding increase in the entering speed.

Furthermore, the valve cover 200 and the piston assembly 300 are made of engineering plastic materials such as PPS, PBT, PC, and the valve cover 200 and the piston assembly 300 are fixedly connected by welding, bonding, clamping and the like.

In the present utility model, as shown in the first structural schematic diagram of the gas flow direction in fig. 7, the arrows in the diagram represent the gas flow direction, when the internal pressure of the battery is greater than the external ambient pressure, the internal pressure of the battery pushes the outer shielding plate 700 to open, and the gas is exhausted from the battery through the exhaust channel 3301, the waterproof and breathable membrane 600 and the exhaust port 210, and the outer shielding plate 700 is automatically closed after the exhaust is completed, at this time, the first exhaust channel 3301 is opened, the other is closed, and the exhaust amount is smaller, so that the normal exhaust requirement of the battery can be satisfied.

In the present utility model, as shown in the second structural schematic diagram of the gas flow direction in fig. 8, the arrows in the diagram represent the gas flow direction, when the internal pressure of the battery is smaller than the external ambient pressure, the internal shielding sheet 500 is pushed to open by the external ambient pressure, and the gas enters the battery from the external environment through the gap, the gas outlet 210, the waterproof and breathable membrane 600 and the gas outlet channel 3301 to automatically supplement the pressure in the battery, and the internal shielding sheet 600 is automatically closed after the pressure supplement is completed; at this time, only one exhaust passage 3301 is opened, and the amount of exhaust is small, but the automatic balance pressure difference requirement of the battery can be satisfied.

In the present utility model, as shown in the third structural schematic diagram of the gas flow direction in fig. 9, the arrows in the diagram represent the gas flow direction, when the pressure inside the battery is greater than the external environment pressure and the pressure inside the battery is greater than the elastic potential energy of the elastic member 400, the pressure will push the piston assembly 300 to move upwards along the supporting member 140, the piston assembly 300 does not shade the opening 150, the elastic member 400 is compressed to accumulate the elastic potential energy, and the gas is directly discharged through the opening 1500 and the gap; at this time, since the exhaust area of the opening 150 is large, the amount of exhaust is increased, and the need for rapid exhaust of the battery in an abnormal state can be satisfied.

In a preferred embodiment of the present utility model, the inner shielding plate 500 is one of a plastic inner shielding plate, a rubber inner shielding plate and an elastic metal inner shielding plate, and the outer shielding plate 700 is one of a plastic outer shielding plate, a rubber outer shielding plate and an elastic metal outer shielding plate.

Specifically, the inner and outer barrier sheets 500 and 700 are made of elastic material, such as rubber sheet, plastic sheet, elastic metal sheet, etc., so that the inner and outer barrier sheets 500 and 700 can be automatically restored when the pressure difference is balanced. In addition, since the strength of the selected elastic materials is different, the opening pressures of the inner shielding plate 500 and the outer shielding plate 700 are also different, and an appropriate opening pressure can be selected according to actual requirements.

In a preferred embodiment of the present utility model, as shown in fig. 2, 5 and 6, the piston assembly 300 includes a guide rod member 310 and a piston member 330, the guide rod member 310 is movably disposed on the support member 140, the piston member 330 is fixed to a first end of the guide rod member 310, wherein the elastic member 400 is disposed at a second end of the guide rod member 310, the piston member 330 is disposed with the exhaust passage 3301, and the waterproof and breathable film 600 and the valve cover 200 are disposed on the piston member 330.

Specifically, the guide member 310 includes a movable section 3102, the movable section 3102 is a smooth circular rod for sleeving the elastic member 400, and the second end of the guide member 310 refers to the movable section 3102 of the guide member 310. In addition, the guide rod member 310 further includes a base section 3101, the base section 3101 has a circular block structure, and the diameter of the base section 3101 is larger than that of the movable section 3102, so that the elastic member 400 can be fixedly connected with the top wall of the circular block structure of the guide rod member 310. The waterproof and breathable membrane 600 and the valve cover 200 are mounted on the piston member 330, and the valve cover 200 can be fixed on the piston member 330 by welding, clamping, bonding and the like.

For example, referring to fig. 3 and 5, the piston member 330 has a disk shape, a cavity 3302 is provided in the top, two exhaust passages 3301 are provided at both sides of the cavity 3302, respectively, and the exhaust passages 3301 are arranged along the center of the piston member 330; the waterproof and breathable membrane 600 and the valve cap 200 are both secured within the cavity 3302, the waterproof and breathable membrane 600 being located between the valve cap 200 and the top wall of the cavity 3302. It can be appreciated that, because the lower part of the valve cover 200 is hollowed out, a closed cavity is formed between the lower part of the valve cover 200 and the cavity 3302, and the side wall of the valve cover 200 is provided with the exhaust port 210, so that the gas in the battery can enter the cavity through the exhaust channel 3301 and then be exhausted through the exhaust port 210; or through the exhaust port 210 into the cavity and through the exhaust passageway 3301.

As another example, referring to fig. 3 and 5, a recess 3304 is further disposed in the cavity 3302, and the recess 3304 is matched with the waterproof and breathable film 600 in shape and size, so that the waterproof and breathable film 600 is attached to the recess 3304. In addition, the waterproof and breathable film 600 may be fixed to the top wall of the recess 3304 by welding or bonding.

In a preferred embodiment of the present utility model, as shown in fig. 2, at least one notch 3303 is disposed on the side wall of the piston member 330, at least one fixture block 220 is disposed on the valve cover 200, the fixture block 220 is clamped on the notch 3303, and the notch 3303 is in communication with the exhaust port 210.

Specifically, the side wall of the piston member 330 is provided with a notch 3303, and the clamping block 220 of the valve cover 200 corresponds to the position of the notch 3303, so that the clamping block 220 is fixed on the notch 3303, and the clamping and fixing effect is achieved. Preferably, the number of the notches 3303 and the locking blocks 220 is 4, so that the supporting force of the valve cover 200 is increased, and the valve cover 200 is more firmly fixed to the valve body 100. It should be noted that, in the present embodiment, the positions of the clamping block 220 and the exhaust port 210 are correspondingly arranged, so that the parts of the valve cover 200 are more convenient to process and install. Of course, the positions of the latch 220 and the air outlet 210 may not be set correspondingly.

Further, as shown in fig. 5, the notch 3303 includes a first card interface 3303b and a second card interface 3303a, the first card interface 3303b is used for fixing the card block 220, and the second card interface 3303a is used for matching with the air outlet 210, so as to increase the air outlet area and the air outlet amount.

In a preferred embodiment of the present utility model, referring to fig. 2 and 6, the piston assembly 300 further includes a magnetic valve element member 320, wherein the magnetic valve element member 320 is disposed at a first end of the piston member 330.

Specifically, the magnetism represents a valve core structure made of magnetic materials, such as magnetic metal materials; the magnetic valve core member 320 and the piston member 330 are integrally formed, the magnetic valve core member 320 is annular, a threaded hole is formed in the magnetic valve core member 320, the guide rod member 310 comprises a connecting section 3103, the connecting section 3103 is located at the upper portion of the movable section 3102, the diameter of the connecting section 3103 is smaller than that of the movable section 3102, and the connecting section 3103 is in a threaded mode, so that the magnetic valve core member 320 is in threaded connection with the guide rod member 310, the guide rod member 310 is convenient to detach and fix, and maintenance and replacement are convenient. Notably, the diameter of the magnetic spool member 320 is the same as the diameter of the movable segment 3102 of the guide member 310.

In this embodiment, when the handheld magnetic tool aligns with the magnetic valve core member 320, the magnetic valve core member 320 moves upward to drive the piston member 330 to move upward due to the magnetic attraction between the magnetic tool and the magnetic valve core member 320, so that the guide rod member 310 moves upward along the support member 140, the elastic member 400 is compressed to store elastic potential energy, the opening 150 covered by the piston member 330 is opened, and the gas in the battery is directly discharged from the opening 150 through the gap; when the hand-held magnetic tool is removed, the magnetic valve core member 320 is no longer subjected to magnetic attraction, the elastic potential energy accumulated by the elastic member 400 is released, the guide rod member 310 moves downward along the support member 140, and the piston assembly 300 is restored to cover the opening 150. In the present utility model, the quick opening of the valve body 100 is achieved by the provision of the magnetic valve core member 320.

In addition, when the airtight detection needs to be carried out on the battery, the piston assembly 300 is opened through the handheld magnetic tool, the valve body 100 is inflated through the inflation tool until the pressure of the battery test is reached, so that the inflation tool is closed to carry out the pressure maintaining test on the battery, and the utility model also has the advantage of being convenient for inflating the battery.

Further, as shown in fig. 6, the magnetic core member 320 is provided with a magnetic reinforcing portion 3201.

Specifically, the magnetic reinforcement part 3201 has a plate-like structure, and may have any shape such as a polygon, a circle, or a rectangle, for increasing the area of the magnetic valve element member 320 and improving the magnetic force of the magnetic valve element member 320.

In a preferred embodiment of the present utility model, as shown in fig. 1 and 4, the valve body 100 has a bolt-shaped structure, and flat portions 1101 are provided at both sides of the thread of the valve body 100.

Specifically, the valve body 100 is a half-tooth bolt type, and comprises a handheld portion 130, an abutting portion 120 and a threaded portion 110, wherein the handheld portion 130 is a smooth cylinder, the abutting portion 120 is of a hexagonal structure, the diameter of the abutting portion is larger than that of the cylindrical structure, threads are arranged on the threaded portion 110 and are used for being in threaded connection with a charging port and a discharging port of a battery, and the valve body is convenient to fix on the charging port and the discharging port of the battery. More specifically, flat portion 1101 is disposed at threaded portion 110, flat portion 1101 is disposed along the center of valve body 100, and the area of flat portion 1101 is larger, so that the device can be fixed even if the threaded hole is deviated from an oval shape when the device is screwed into the threaded hole of the battery, and the device is more convenient to install.

In a preferred embodiment of the present utility model, as shown in fig. 2, a first sealing ring 900 is disposed at the connection between the valve body 100 and the battery.

Specifically, the first seal ring 900 is located at the top of the threaded portion 110 of the valve body 100, and the first seal ring 900 is used for sealing the connection between the battery and the valve body 100, so as to prevent the tightness of the valve body 100 from being affected.

In a preferred embodiment of the present utility model, as shown in fig. 2, a second seal 800 is provided between the valve body 100 and the piston assembly 300.

Specifically, the second seal ring 800 is mounted on the support member 140 and is located in the valve body 100, and the second seal ring 800 is connected with the bottom of the piston member 330 in a sealing manner, so as to prevent the piston member 330 from leaking from the opening 150 in the valve body 100, and increase the tightness.

The utility model also provides a battery, which comprises the explosion-proof valve in any embodiment, and the explosion-proof valve is particularly described above.

The battery provided by the utility model has all the beneficial effects due to the arrangement of the explosion-proof valve in any one of the technical schemes, and the details are not repeated here.

In summary, the utility model provides an explosion-proof valve and a battery thereof, wherein an exhaust channel, an exhaust port, an inner shielding sheet, an outer shielding sheet and a waterproof breathable film are arranged on a piston assembly; when the battery is charged and discharged, when the gas in the battery is accumulated and expanded, the internal pressure of the battery is high, the external pressure is low, so that the elastic component is compressed to push the piston component to move upwards, the outer shielding piece at the second end of the exhaust channel is opened, the gas is fully released from the gap of the exhaust port extending upwards out of the valve body, the gas is filtered by the waterproof breathable film and then is discharged, the released gas is prevented from polluting the air, and the dustproof and waterproof effects can be achieved; when the internal pressure of the battery is small and the external pressure is high, external air is filtered through the waterproof breathable film through the gap and the exhaust port and then is transmitted to the exhaust channel to push the inner shielding sheet to be opened, so that the external air enters the battery, and the pressure difference inside the battery is balanced. The utility model not only can quickly release the internal gas in the process of charging and discharging the battery, but also can ensure that the pressure difference balance is automatically carried out when the battery is transported, thereby preventing the spontaneous combustion phenomenon of the battery. In addition, because of the arrangement of the magnetic valve core component, the valve body can be opened quickly by matching with the magnetic tool.

It is to be understood that the utility model is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (10)

1. An explosion-proof valve, comprising:

a valve body in which a support member is disposed, an opening being formed between the support member and an inside of the valve body;

the piston assembly is movably arranged on the supporting member and covers the opening, and comprises two exhaust channels which are communicated with the opening;

the valve cover is arranged on the piston assembly, at least one exhaust port is arranged on the side wall of the valve cover, and the exhaust port is communicated with the exhaust channel;

the elastic component is arranged on the piston component, one end of the elastic component is fixedly connected with the inner wall of the supporting component, and the other end of the elastic component is fixedly connected with the piston component;

a gap is arranged between the exhaust port and the side wall of the valve body;

an inner shielding sheet is locally arranged at the first end of one of the exhaust channels;

an outer shielding sheet is arranged at the second end of the other exhaust channel locally;

a waterproof and breathable film is arranged between the valve cover and the piston.

2. The explosion-proof valve according to claim 1, wherein the inner shielding sheet is one of a plastic inner shielding sheet, a rubber inner shielding sheet and an elastic metal inner shielding sheet, and the outer shielding sheet is one of a plastic outer shielding sheet, a rubber outer shielding sheet and an elastic metal outer shielding sheet.

3. An explosion-proof valve as set forth in claim 2, wherein said piston assembly includes:

the guide rod component is movably arranged on the supporting component;

a piston member fixed to a first end of the guide rod member;

wherein the second end of the guide rod member is provided with the elastic member;

the piston member is provided with the exhaust passage;

the piston member is provided with the waterproof and breathable film and the valve cover.

4. An explosion-proof valve as claimed in claim 3, wherein said valve cover is secured to said piston member by welding, bonding or clamping.

5. The explosion protection valve of claim 4, wherein said piston assembly further comprises a magnetic valve core member disposed at a first end of said piston member, said magnetic valve core member being removably connected to said guide rod member.

6. The explosion-proof valve according to claim 5, wherein the magnetic valve core member is provided with a magnetic reinforcing portion.

7. An explosion-proof valve according to claim 1, wherein the valve body has a bolt-shaped structure, and flat portions are provided on both sides of the valve body.

8. An explosion-proof valve as claimed in claim 1, wherein the valve body is provided with a first sealing ring at a communication position with the battery.

9. An explosion-proof valve as set forth in claim 1, wherein a second seal is disposed between said valve body and said piston assembly.

10. A battery comprising the use of an explosion-proof valve as claimed in any one of claims 1 to 9.