CN221176555U

CN221176555U - Exhaust device for battery and battery with same

Info

Publication number: CN221176555U
Application number: CN202322225474.3U
Authority: CN
Inventors: 谭伟华; 于红博; 夏佳玲; 颜海鹏
Original assignee: Chongqing Fudi Battery Research Institute Co ltd
Current assignee: Chongqing Fudi Battery Research Institute Co ltd
Priority date: 2023-08-18
Filing date: 2023-08-18
Publication date: 2024-06-18
Anticipated expiration: 2033-08-18

Abstract

The utility model discloses an exhaust device for a battery and the battery with the same. The control valve comprises a valve shell and a valve core assembly arranged in the valve shell, wherein the valve shell is provided with an exhaust channel, one end of the exhaust channel is communicated with the outside, the other end of the exhaust channel is suitable for being communicated with a liquid injection hole of the battery, the valve core assembly can be switched between an open position and a closed position, the liquid injection hole is communicated with the outside when the valve core assembly is positioned at the open position, and the liquid injection hole is cut off from the outside when the valve core assembly is positioned at the closed position. The breathable liquid-blocking film is arranged in the exhaust channel. According to the exhaust device for the battery, gas in the battery can be exhausted out through the ventilation liquid-resistant film and the exhaust channel, meanwhile, electrolyte can be prevented from overflowing from the battery, and the safety and the service life of the battery are improved.

Description

Exhaust device for battery and battery with same

Technical Field

The utility model relates to the technical field of batteries, in particular to an exhaust device for a battery and the battery with the exhaust device.

Background

In the related art, during the use process of the battery, gas is generated when the electrolyte reacts or ages at high temperature, and the gas can bulge the battery and affect the use of the battery, so that the battery needs to be exhausted at regular time. However, when the battery is exhausted, a high pressure still exists in the battery, so that electrolyte in the battery is sprayed out, or air spraying can occur, so that personal safety of an operator is at a certain risk, and the battery is not beneficial to safe use.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide an exhaust device for a battery, in which gas inside the battery can be exhausted to the outside through a gas-permeable resistive film and an exhaust passage, and at the same time, electrolyte can be prevented from overflowing from the inside of the battery, thereby improving the safety and the service life of the battery.

Another object of the present utility model is to propose a battery comprising the above-mentioned exhaust device for a battery.

An exhaust apparatus for a battery according to an embodiment of a first aspect of the present utility model includes: the control valve comprises a valve shell and a valve core assembly arranged in the valve shell, wherein the valve shell is provided with an exhaust channel, one end of the exhaust channel is communicated with the outside, the other end of the exhaust channel is suitable for being communicated with a liquid injection hole of a battery, the valve core assembly can be switched between an open position and a closed position, the liquid injection hole is communicated with the outside when the valve core assembly is positioned at the open position, and the liquid injection hole is cut off from the outside when the valve core assembly is positioned at the closed position; the ventilation liquid-resistant film is arranged in the exhaust channel.

According to the exhaust device for the battery, the control valve is arranged at the liquid injection hole of the battery, the exhaust channel of the control valve is used for communicating the interior of the battery with the outside, the air-permeable liquid-resistant film is arranged in the exhaust channel, and the valve core component of the control valve can be switched between the open position and the closed position, so that compared with the traditional exhaust device of the battery, the exhaust device for the battery can be used for exhausting gas in the battery from the outside through the air-permeable liquid-resistant film and the exhaust channel, meanwhile, electrolyte can be prevented from overflowing from the interior of the battery, and the safety and the service life of the battery are improved.

According to some embodiments of the utility model, the cross-sectional area of the breathable liquid-resistant film is greater than or equal to the cross-sectional area of the liquid injection hole.

According to some embodiments of the utility model, the breathable liquid-resistant film has a breathable aperture of D, wherein D satisfies: d is more than or equal to 0.2 mu m and less than or equal to 2.0 mu m.

According to some embodiments of the utility model, the thickness of the breathable barrier film is d, wherein d satisfies: d is more than or equal to 0.2mm and less than or equal to 5.0mm.

According to some embodiments of the utility model, the ventilation amount of the breathable liquid-resistant film is T, and the water pressure resistance value of the breathable liquid-resistant film is P, wherein the T, P satisfies: t > 100mL/min/cm ², P > 400kpa (30 min).

According to some embodiments of the utility model, the breathable liquid-resistant film comprises at least one of a polytetrafluoroethylene film and a polyester resin film.

According to some embodiments of the utility model, the exhaust apparatus for a battery further includes: the communicating piece, the communicating piece is hollow structure, the one end of communicating piece is in the cooperation of annotating the liquid hole, the other end of communicating piece is in the exhaust passage, ventilative liquid-blocking membrane is located the other end of communicating piece.

According to some embodiments of the utility model, the communication member is a rubber member.

According to some embodiments of the utility model, the valve core assembly comprises an elastic piece and a valve core, one end of the elastic piece is connected with the valve housing, the other end of the elastic piece is connected with the valve core, and the valve core is driven to move along the axial direction of the valve core under the action of the elastic piece.

According to some embodiments of the utility model, the valve core is formed with a groove, a bottom wall of the groove is provided with a matching protrusion, and the other end of the elastic piece is sleeved on the matching protrusion.

According to some embodiments of the utility model, the vent passage comprises a first passage section and a second passage section in communication with each other, the first passage section extending in an axial direction of the valve housing, the second passage section extending in a radial direction of the valve housing, and the second passage section being located on a side of the first passage section adjacent to the valve spool, wherein the valve spool seals off the first passage section through the second passage section when the valve spool assembly is in the closed position.

According to some embodiments of the utility model, the bore diameter of the first passage section gradually decreases in a direction towards the spool assembly.

According to some embodiments of the utility model, the exhaust apparatus for a battery further includes: and the clamping piece is sleeved at the end part of the valve casing and is suitable for clamping the battery.

A battery according to an embodiment of a second aspect of the present utility model includes the above-described exhaust device for a battery according to an embodiment of the first aspect of the present utility model.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 is a schematic view of an exhaust device and a battery according to an embodiment of the present utility model.

Reference numerals:

100. An exhaust device;

1. A control valve; 11. a valve housing; 111. an exhaust passage; 1111. a first channel segment; 1112. a second channel segment; 12. a valve core assembly; 121. an elastic member; 122. a valve core; 1221. a groove; 1222. fitting the protrusion; 2. a breathable liquid-blocking film; 3. a communication member; 4. a clamping member;

200. A battery; 201. and a liquid injection hole.

Detailed Description

An exhaust apparatus 100 for a battery 200 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1.

As shown in fig. 1, an exhaust apparatus 100 for a battery 200 according to an embodiment of the first aspect of the present utility model includes a control valve 1 and a gas-permeable liquid-blocking film 2.

Specifically, the control valve 1 includes a valve housing 11 and a valve body assembly 12 provided in the valve housing 11, the valve housing 11 having a vent passage 111, one end of the vent passage 111 being in communication with the outside, and the other end of the vent passage 111 being adapted to be in communication with the liquid filling hole 201 of the battery 200. The valve core assembly 12 is switchable between an open position and a closed position, the liquid injection hole 201 is communicated with the outside when the valve core assembly 12 is located at the open position, and the liquid injection hole 201 is cut off from the outside when the valve core assembly 12 is located at the closed position. The ventilation liquid-blocking film 2 is provided inside the exhaust passage 111.

For example, in the example of fig. 1, the liquid filling hole 201 communicates with the accommodation chamber of the battery 200 through the upper side wall of the battery 200, and the control valve 1 is provided at the liquid filling hole 201 of the battery 200. The exhaust passage 111 is provided at one end of the control valve 1 near the battery 200, and one end of the exhaust passage 111 extends into the battery 200 through the liquid injection hole 201 of the battery 200. The gas-permeable liquid-resistant film 2 is disposed at one end of the gas-discharge passage 111 near the battery 200, and in order to avoid corrosion of the gas-permeable liquid-resistant film 2 by the electrolyte in the battery 200, the gas-permeable liquid-resistant film 2 may be disposed at a position outside the battery 200 in the gas-discharge passage 111. Wherein the gas-permeable liquid-barrier film 2 allows the passage of gas but blocks the passage of liquid.

Specifically, when the battery 200 is produced in a specific process (for example, the positive electrode lithium-compensating battery cell is aged at a high temperature), chemical reaction occurs in the battery 200 to generate gas, and thus the gas pressure in the battery 200 is increased, and the gas generated in the battery 200 needs to be exhausted to maintain the normal gas pressure in the battery 200, so as to prevent the swelling of the battery 200. After the ventilation liquid-resistant film 2 is arranged inside the exhaust passage 111, when the valve core assembly 12 is located at the open position, the exhaust passage 111 communicates the inside of the battery 200 with the outside, so that gas inside the battery 200 can pass through the ventilation liquid-resistant film 2 and be discharged to the outside, and electrolyte inside the battery 200 can be ensured to be unable to pass through the ventilation liquid-resistant film 2. When the air pressure inside the battery 200 is restored to the normal air pressure, the air discharge device 100 is returned to the closed position. Therefore, the air pressure in the battery 200 is reduced, electrolyte in the battery 200 is prevented from leaking, the risks of deformation of the battery 200 and valve opening of an explosion-proof valve of the battery 200 are greatly reduced, the safety of personnel in the working procedure is improved, and the safety and the service life of the battery 200 are also improved.

According to the vent apparatus 100 for a battery 200 of the embodiment of the utility model, by installing the control valve 1 at the liquid injection hole 201 of the battery 200, the inside of the battery 200 is communicated with the outside by the vent passage 111 of the control valve 1, and the ventilation liquid-blocking film 2 is provided inside the vent passage 111, and the valve element assembly 12 of the control valve 1 can be switched between the open position and the closed position. Therefore, compared with the conventional exhaust device of the battery, the gas in the battery 200 can be exhausted out through the air-permeable liquid-resistant film 2 and the exhaust channel 111, and meanwhile, electrolyte can be prevented from overflowing from the battery 200, so that the safety and the service life of the battery 200 are improved.

According to some embodiments of the present utility model, the cross-sectional area of the breathable liquid-resistant film 2 is equal to or greater than the cross-sectional area of the liquid-injection hole 201. As shown in fig. 1, when the cross-sectional area of the gas-permeable liquid-resistant film 2 is smaller than that of the liquid-injecting hole 201, the gas-permeable liquid-resistant film 2 cannot completely cover the liquid-injecting hole 201, and when the battery 200 is exhausted, part of gas and liquid still overflows from the gap between the gas-permeable liquid-resistant film 2 and the liquid-injecting hole 201, so that the battery 200 leaks, which is unfavorable for normal operation of the battery 200 and safe use of the battery 200. Thus, by making the cross-sectional area of the gas-permeable liquid-resistant film 2 equal to or larger than the cross-sectional area of the liquid-injection hole 201, it is possible to ensure that the gas-permeable liquid-resistant film 2 can completely cover the liquid-injection hole 201 and ensure that the electrolyte inside the battery 200 is not ejected, thereby enabling the battery 200 to operate normally.

According to some embodiments of the present utility model, the breathable liquid-resistant film 2 has a breathable hole with a pore diameter D, wherein D satisfies: d is more than or equal to 0.2 mu m and less than or equal to 2.0 mu m. Referring to fig. 1, when the pore diameter of the vent hole is less than 0.2 μm, the pore diameter is too small, which results in slow discharge of gas generated inside the battery 200 through the vent hole, and too low air permeability of the air-permeable liquid-blocking film 2, reducing the exhaust efficiency. When the hole diameter of the vent hole is greater than 2.0 μm, the hole diameter of the vent hole is too large, and when the valve core assembly 12 is at the open position, gas and electrolyte may be discharged through the vent hole, and external gas may enter the battery 200, which may cause damage to the battery 200. Therefore, when the aperture D of the ventilation holes is smaller than or equal to 0.2 mu m and smaller than or equal to 2.0 mu m, the ventilation device can ensure that the gas in the battery 200 can be completely discharged from the ventilation liquid-resistant film 2, improve the exhaust efficiency, ensure that the battery 200 can work normally, prevent the electrolyte in the battery 200 from overflowing, and reduce the production cost.

Further, the thickness of the breathable liquid-resistant film 2 is d, wherein d satisfies: d is more than or equal to 0.2mm and less than or equal to 5.0mm. When the thickness of the breathable liquid-resistant film 2 is less than 0.2mm, when the gas inside the battery 200 is too much and the gas pressure is too large, the gas may generate a strong impact force on the breathable liquid-resistant film 2, so that the breathable liquid-resistant film 2 may be ruptured. When the thickness of the breathable liquid-resistant film 2 is greater than 5.0mm, the breathable liquid-resistant film 2 is insufficient in breathability, and gas in the battery 200 cannot be discharged through the breathable liquid-resistant film 2, so that the battery 200 is not conveniently discharged. Therefore, when the thickness of the breathable liquid-resistant film 2 meets 0.2mm less than or equal to d less than or equal to 5.0mm, the structural strength of the breathable liquid-resistant film 2 can be ensured, the breathable liquid-resistant film 2 is prevented from being damaged, and the good breathability of the breathable liquid-resistant film 2 can be ensured.

According to some embodiments of the utility model, the ventilation amount of the breathable liquid-resistant film 2 is T, and the water pressure resistance value of the breathable liquid-resistant film 2 is P, wherein T, P satisfies: t > 100mL/min/cm ², P > 400kpa (30 min). When the ventilation rate T of the gas-permeable liquid-blocking film 2 is less than 100mL/min/cm ², the gas-permeable amount of the gas-permeable liquid-blocking film 2 is limited and the gas inside the battery 200 cannot be completely discharged when the battery 200 is exhausted. When the water pressure resistance P of the gas-permeable liquid-resistant film 2 is less than 400kpa (30 min), the gas-permeable liquid-resistant film 2 may be broken under the action of high pressure when the gas pressure after the gas generation inside the battery 200 reaches 400kpa or more. Thus, the ventilation amount T of the ventilation resistance film 2 is set to be: t is more than 100mL/min/cm ², and the water pressure resistance value P of the breathable liquid resistance film 2 meets the following conditions: p is more than 400kpa (30 min), so that the ventilation quantity of the ventilation liquid-resistant film 2 is ensured to be enough, the gas in the battery 200 can completely pass through, the ventilation liquid-resistant film 2 can be prevented from being damaged, and the service life of the ventilation liquid-resistant film 2 is prolonged. It should be noted that 400kpa (30 min) means a pressure that can be sustained at 400kpa within 30 minutes.

According to some embodiments of the present utility model, the breathable liquid-resistant film 2 includes at least one of a polytetrafluoroethylene film and a polyester resin film. The polytetrafluoroethylene membrane has the characteristics of smooth surface, chemical resistance, air permeability, water impermeability, large air permeability, flame retardance, high temperature resistance, acid and alkali resistance, no toxicity and the like, and has the advantages of high filtering efficiency, high filtering speed, long service life and repeated use. The polyester resin film has the characteristics of oil resistance, fat resistance, dilute acid resistance, dilute alkali resistance and the like, and most solvents and high temperature resistance. Therefore, the breathable liquid-resistant film 2 comprises a polytetrafluoroethylene film and/or a polyester resin film as the material of the breathable liquid-resistant film 2, so that the breathable liquid-resistant film 2 can play a better role in ventilation, and the breathable liquid-resistant film 2 has a longer service life.

According to some embodiments of the utility model, the exhaust device 100 further comprises a communication member 3. The communicating member 3 is hollow structure, and the one end of communicating member 3 cooperates at annotating liquid hole 201, and the other end of communicating member 3 cooperates in exhaust passage 111, and ventilative liquid-blocking membrane 2 is located the other end of communicating member 3. For example, in the example of fig. 1, the communicating member 3 is in a hollow cylindrical shape, and two ends of the communicating member 3 are respectively matched with the liquid injection hole 201 and the air exhaust channel 111, so that the liquid injection hole 201 and the air exhaust channel 111 can be communicated through the communicating member 3, and air leakage can be avoided when the liquid injection hole 201 is matched with the air exhaust device 100, so that good air tightness inside the battery 200 is ensured, and the battery 200 and the air exhaust device 100 can exhaust smoothly.

According to some embodiments of the utility model, the communication member 3 is a rubber member. The rubber piece has good comprehensive performance, oil resistance, flame resistance, oxidation resistance and ozone resistance, has certain elasticity, and can also play a good sealing role.

According to some embodiments of the present utility model, the valve core assembly 12 includes an elastic member 121 and a valve core 122, one end of the elastic member 121 is connected to the valve housing 11, the other end of the elastic member 121 is connected to the valve core 122, and the valve core 122 is driven to move in an axial direction (e.g., up-down direction in fig. 1) of the valve core 122 by the force of the elastic member 121. As shown in fig. 1, the elastic members 121 are arranged to extend in the longitudinal direction (e.g., up-down direction in fig. 1) of the spool assembly 12. The end of the elastic member 121 connected to the valve housing 11 is a fixed end, the end of the elastic member 121 connected to the valve core 122 is a movable end, and the movable end is connected to the valve core 122, and when the valve core 122 moves in a direction away from the battery 200, the elastic member 121 is compressed.

Specifically, when gas is generated in the battery 200, the gas pressure in the battery 200 increases, the gas in the battery 200 contacts the valve core 122 through the gas-permeable resistive film 2 and the exhaust channel 111, and a certain pressure is generated on the valve core 122 and the elastic member 121, so that the valve core 122 is pushed to move away from the battery 200, and the elastic member 121 is compressed by the pressure, at this time, the exhaust device 100 becomes an open position, and the gas can be exhausted from the exhaust channel 111 to the outside. When the gas in the battery 200 is exhausted, the gas pressure in the battery 200 is restored to be the same as the atmospheric pressure, the pressure applied to the elastic member 121 is eliminated, the compressed elastic member 121 begins to apply a downward restoring force to the valve core 122, the elastic member 121 begins to restore to deform in a direction approaching the battery 200, and simultaneously drives the valve core 122 to move in a direction approaching the battery 200, so that the valve core 122 moves to the closed position of the exhaust device 100. Thereby, the air discharging device 100 is automatically opened and closed, thereby automatically discharging the battery 200.

The pressure of the exhaust device 100 when the battery 200 is exhausted can be adjusted according to the elastic force of the elastic member 121.

Further, the spool 122 is formed with a groove 1221, the bottom wall of the groove 1221 is provided with a fitting protrusion 1222, and the other end of the elastic member 121 is sleeved on the fitting protrusion 1222. For example, in the example of fig. 1, the groove 1221 is concavely formed from one end of the spool 122 near the elastic member 121, and the fitting projection 1222 is convexly formed from the bottom wall of the groove 1221 toward the direction near the elastic member 121. A portion of the elastic member 121 is located in the groove 1221 and is engaged with the engagement protrusion 1222. Thus, the elastic member 121 and the valve element 122 can be fixedly connected, separation of the elastic member 121 and the valve element 122 in the moving process can be prevented, and normal operation of the exhaust device 100 can be ensured.

According to some embodiments of the present utility model, the exhaust passage 111 includes a first passage section 1111 and a second passage section 1112 that communicate with each other, the first passage section 1111 extends in an axial direction (e.g., up-down direction in fig. 1) of the valve housing 11, the second passage section 1112 extends in a radial direction (e.g., left-right direction in fig. 1) of the valve housing 11, and the second passage section 1112 is located on a side of the first passage section 1111 adjacent to the valve spool 122. Wherein when the valve spool assembly 12 is in the closed position, the valve spool 122 seals off the first passage section 1111 through the second passage section 1112.

Referring to fig. 1, a first channel section 1111 and a second channel section 1112 constitute a T-shaped exhaust channel 111, the first channel section 1111 communicates with the liquid injection hole 201, and the second channel section 1112 extends in the radial direction of the first channel section 1111 from an end of the first channel section 1111 remote from the battery 200. When the valve core assembly 12 is in the closed position, the valve core 122 seals the connection between the first channel section 1111 and the second channel section 1112, and blocks the communication between the second channel section 1112 and the first channel section 1111, so that the interior of the battery 200 is blocked from the outside. When the air pressure inside the battery 200 increases, the elastic member 121 and the valve body 122 are moved upward by the pressure from the inside of the battery 200, the valve body 122 moves away from the junction of the first passage section 1111 and the second passage section 1112, and the first passage section 1111 communicates with the second passage section 1112, and thus the inside of the battery 200 also communicates with the outside, so that the gas inside the battery 200 can be discharged from the exhaust passage 111 to the outside. In addition, by making the extending direction of the first passage section 1111 perpendicular to the extending direction of the second passage section 1112, the height of the exhaust apparatus 111 can be reduced while ensuring the path length of the exhaust passage 111, facilitating the miniaturization design of the exhaust apparatus 100.

Further, as shown in FIG. 1, the bore diameter of the first passage section 1111 gradually decreases in a direction toward the valve core assembly 12. The shape of the first channel section 1111 is a truncated cone shape, when the gas passes through the first channel section 1111, since the aperture of the first channel section 1111 through which the gas passes gradually decreases, the pressure of the gas also gradually increases, so that the valve core 121 can be rapidly pushed to move, and meanwhile, the flow speed of the gas in the first channel section 1111 is increased, so that the gas can be rapidly discharged, and thus, the battery 200 can be rapidly restored to operation.

According to some embodiments of the utility model, the exhaust device 100 further comprises a clamp 4. The clamping member 4 is sleeved at the end of the valve housing 11, and the clamping member 4 is suitable for clamping on the battery 200. Referring to fig. 1, the clamping member 4 is provided at one end of the valve housing 11 near the battery 200, the cross section of the clamping member 4 is generally U-shaped, and the opening of the U-shape faces the battery 200, so that the width of the clamping member 4 can be designed to be wider to ensure that the exhaust device 100 can be stably clamped on the battery 200 by the clamping member 4. The exhaust device 100 is connected with the battery 200 through the clamping piece 4, so that the battery 200 is fixedly connected with the exhaust device 100 through the clamping piece 4, the exhaust device 100 can be prevented from falling off from the battery 200, and the connection mode is simple and convenient to operate. Alternatively, the clamping member 4 may be a clasp. But is not limited thereto.

The battery 200 according to the embodiment of the second aspect of the present utility model includes the above-described exhaust device 100 for the battery 200 according to the embodiment of the first aspect of the present utility model.

According to the battery 200 of the present utility model, by adopting the above-mentioned exhaust device 100, the gas generated by the operation inside the battery 200 can be automatically exhausted through the exhaust device 100, and the electrolyte can be prevented from being sprayed out, thereby improving the safety and the service life of the battery 200.

Other constructions and operation of batteries according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. An exhaust device for a battery, comprising:

The control valve comprises a valve shell and a valve core assembly arranged in the valve shell, wherein the valve shell is provided with an exhaust channel, one end of the exhaust channel is communicated with the outside, the other end of the exhaust channel is suitable for being communicated with a liquid injection hole of a battery, the valve core assembly can be switched between an open position and a closed position, the liquid injection hole is communicated with the outside when the valve core assembly is positioned at the open position, and the liquid injection hole is cut off from the outside when the valve core assembly is positioned at the closed position;

The ventilation liquid-resistant film is arranged in the exhaust channel.

2. The exhaust device for a battery according to claim 1, wherein a cross-sectional area of the gas-permeable liquid-blocking film is equal to or larger than a cross-sectional area of the liquid-injecting hole.

3. The exhaust apparatus for a battery according to claim 1, wherein the ventilation liquid-blocking film has a ventilation hole having a pore diameter D, wherein the D satisfies: d is more than or equal to 0.2 mu m and less than or equal to 2.0 mu m.

4. The exhaust apparatus for a battery according to claim 1, wherein the thickness of the gas-permeable liquid-blocking film is d, wherein d satisfies: d is more than or equal to 0.2mm and less than or equal to 5.0mm.

5. The exhaust apparatus for a battery according to claim 1, wherein the ventilation amount of the gas-permeable liquid-resistant film is T, the water pressure resistance value of the gas-permeable liquid-resistant film is P, wherein the T, P satisfies: t > 100mL/min/cm ², P > 400kpa (30 min).

6. The exhaust apparatus for a battery according to claim 1, wherein the gas-permeable liquid-blocking film comprises any one of a polytetrafluoroethylene film and a polyester resin film.

7. The exhaust apparatus for a battery according to any one of claims 1 to 6, further comprising:

The communicating piece, the communicating piece is hollow structure, the one end of communicating piece is in the cooperation of annotating the liquid hole, the other end of communicating piece is in the exhaust passage, ventilative liquid-blocking membrane is located the other end of communicating piece.

8. The exhaust apparatus for a battery according to claim 7, wherein the communication member is a rubber member.

9. The exhaust apparatus for a battery according to any one of claims 1 to 6, wherein the valve body assembly includes an elastic member and a valve body, one end of the elastic member is connected to the valve housing, and the other end of the elastic member is connected to the valve body, and the valve body is driven to move in an axial direction of the valve body by an urging force of the elastic member.

10. The exhaust apparatus for a battery according to claim 9, wherein the valve core is formed with a groove, a bottom wall of the groove is provided with a fitting protrusion, and the other end of the elastic member is fitted over the fitting protrusion.

11. The exhaust device for a battery according to claim 9, wherein the exhaust passage includes a first passage section and a second passage section that communicate with each other, the first passage section extends in an axial direction of the valve housing, the second passage section extends in a radial direction of the valve housing, and the second passage section is located on a side of the first passage section adjacent to the valve spool,

Wherein when the valve element assembly is in the closed position, the valve element passes through the second channel segment to block the first channel segment.

12. The exhaust for a battery of claim 11, wherein the bore diameter of the first passage segment gradually decreases in a direction toward the valve spool assembly.

13. The exhaust apparatus for a battery according to claim 11, further comprising:

and the clamping piece is sleeved at the end part of the valve casing and is suitable for clamping the battery.

14. A battery comprising the exhaust device for a battery according to any one of claims 1 to 13.