CN115020907A

CN115020907A - Battery explosion-proof valve and explosion-proof battery device applied by same

Info

Publication number: CN115020907A
Application number: CN202210624018.3A
Authority: CN
Inventors: 鲁雅洁; 董雷; 蒋治亿; 魏思伟
Original assignee: Trina Energy Storage Solutions Jiangsu Co Ltd
Current assignee: Trina Energy Storage Solutions Jiangsu Co Ltd
Priority date: 2022-06-03
Filing date: 2022-06-03
Publication date: 2022-09-06

Abstract

The embodiment of the present disclosure provides a battery explosion-proof valve and an explosion-proof battery device using the same, wherein the battery explosion-proof valve includes: a valve housing; a valve core; the elastic expansion piece is arranged in the inner space, and two ends of the elastic expansion piece are fixedly connected with the valve core and the valve shell respectively so that the valve core can elastically expand to block or open the air inlet part; when the elastic expansion piece is in a natural state, the valve core blocks the air inlet part; when the valve core opens the air inlet part, a gap between the valve core and the valve shell forms an exhaust channel for communicating the air inlet part and the air outlet part; the sounding structure is formed in the valve shell and receives airflow and generates sound; and the dustproof and waterproof breathable film is covered on the exhaust part. The valve core in the battery explosion-proof valve moves to open the exhaust channel when being impacted by battery gas and automatically resets after exhausting, and the valve core is long in service life and convenient to recycle. The cooperation covers inside the dustproof and waterproof ventilated membrane of portion of giving vent to anger effectively protects the case, by further promoting the life-span. In addition, the alarm can be given when exhausting by matching with a sounding structure formed on the valve shell, so that effective reminding is formed.

Description

Battery explosion-proof valve and explosion-proof battery device applied by same

Technical Field

The present disclosure relates to the field of battery technology, and more particularly, to an explosion-proof valve for a battery and an explosion-proof battery device using the same.

Background

The explosion-proof valve of the lithium battery is a device for preventing the lithium battery from exploding under the thermal runaway state. The lithium cell produces a large amount of gases under the thermal runaway state, finally breaks open battery case, takes place violent explosion, and battery sheet still can burn in the twinkling of an eye of contact air, and both can influence other group battery and equipment, cause secondary damage, have very big potential safety hazard. The existence of the explosion-proof valve is to lead out gas in the thermal runaway deflation process of the battery, so as to prevent the battery from expanding and breaking the shell and generating potential safety hazard. Poor, the unreasonable explosion-proof valve of design, it is inaccurate to thermal runaway's reaction, lead to the battery to take place the detonation easily under thermal runaway state. Therefore, the design of the explosion-proof device for the lithium battery plays a very important role in the safety of the battery.

At present, the design of lithium battery explosion-proof valve in the market is more single, and the explosion-proof piece that mostly all is laser welding rises through the inside atmospheric pressure of casing and breaks explosion-proof piece, loses heart in order to reach the guard action. When the explosion-proof sheet reaches a certain pressure, the explosion-proof sheet directly expands and breaks, so that the top cover is damaged, and the whole shell is scrapped. And the critical pressure of the internal air pressure is fixed, and the exhaust cannot be realized when the critical pressure is not reached, which is a potential safety hazard. Meanwhile, the alarm for thermal runaway is lacked, so that a user is easy to neglect and hurt people.

Inventing messages

In view of the above disadvantages of the related art, it is an object of the present disclosure to provide a battery explosion-proof valve and an explosion-proof battery device applied thereto to solve the problems in the related art.

The first aspect of the present disclosure provides a battery explosion-proof valve, including: a valve housing having an internal space, and an intake portion and an exhaust portion communicating with the internal space; the air inlet part is arranged at the bottom of the valve shell, and the air outlet part is arranged on the side wall of the valve shell; the air inlet part is communicated with a pressure relief part of the battery; a valve core disposed in the internal space corresponding to the air inlet portion and configured to be vertically movable in the internal space; the elastic expansion piece is arranged in the inner space; two ends of the elastic expansion piece respectively correspond to the valve core and the valve shell, so that the valve core can expand and contract along with the valve core to block or open the air inlet part; the elastic expansion piece is pressed against the valve core until the air inlet part is blocked; when the valve core opens the air inlet part, an air exhaust channel for communicating the air inlet part and the air outlet part is formed in a gap between the valve core and the valve shell; the sounding structure is formed on the valve shell, communicated with the exhaust passage and used for receiving airflow and sounding; and the dustproof and waterproof breathable film is covered on the exhaust part.

In some embodiments of the first aspect, the valve housing and valve spool are cylindrical.

In some embodiments of the first aspect, the resilient bellows extends in an axial direction of a longitudinal direction of the valve housing.

In some embodiments of the first aspect, the dustproof and waterproof breathable film is made of expanded polytetrafluoroethylene.

In some embodiments of the first aspect, the vent portion comprises at least one vent hole circumferentially continuous or segmented along the valve housing side surface.

In some embodiments of the first aspect, at least two of the exhaust holes are symmetrically disposed at two opposite positions of the side surface.

In some embodiments of the first aspect, the sound emitting structure comprises: a horizontal airflow passage formed in the valve housing and having an airflow inlet; the airflow inlet is communicated with the horizontal airflow channel and the exhaust channel; an air outlet disposed on one side of the horizontal air flow channel; the blocking wall is convexly arranged opposite to the air outlet to form an end part, the front surface of the blocking wall faces the horizontal airflow channel, and a first gap communicated with the air outlet is formed between the end part and the side wall of the air outlet on one side of the front surface; and an airflow cavity is formed behind the back surface of the blocking wall, and a second gap communicated with the air outlet is formed between the end part of the blocking wall and the side wall of the air outlet on one side of the airflow cavity.

In some embodiments of the first aspect, the end is a tip.

A second aspect of the present disclosure provides an explosion-proof battery device, including: a battery body having a lid body provided with a pressure relief portion; the battery explosion-proof valve according to any one of the first aspect, wherein the air inlet portion is fixedly communicated with the pressure relief portion.

In some embodiments of the second aspect, the battery body is a lithium battery.

As described above, the embodiment of the present disclosure provides a battery explosion-proof valve and an explosion-proof battery device using the same, including: a valve housing; a valve core disposed in the internal space corresponding to the air inlet portion and configured to be vertically movable in the internal space; the elastic expansion piece is arranged in the inner space; two ends of the elastic expansion piece respectively correspond to the valve core and the valve shell, so that the valve core can expand and contract along with the valve core to block or open the air inlet part; the elastic expansion piece is pressed against the valve core until the air inlet part is blocked; when the valve core opens the air inlet part, an air exhaust channel for communicating the air inlet part and the air outlet part is formed in a gap between the valve core and the valve shell; the sounding structure is formed on the valve shell, communicated with the exhaust passage and used for receiving airflow and sounding; and the dustproof and waterproof breathable film is arranged on the exhaust part in a covering manner. The valve core in the battery explosion-proof valve in the embodiment of the disclosure moves to open the exhaust channel when being impacted by battery gas and automatically resets after exhausting, so that the service life is long and the valve core is convenient to recycle. The cooperation covers inside the dustproof and waterproof ventilated membrane of portion of giving vent to anger effectively protects the case, by further promoting the life-span. In addition, the alarm can be given when exhausting by matching with a sounding structure formed on the valve shell, so that effective reminding is formed.

Drawings

Fig. 1 shows a schematic perspective view of a battery explosion-proof valve according to an embodiment of the present disclosure.

Fig. 2 shows a schematic longitudinal sectional view of a battery explosion-proof valve according to an embodiment of the present disclosure.

Fig. 3 shows a schematic diagram of a sounding structure in an embodiment of the present disclosure.

Detailed Description

Embodiments of the present disclosure are described below with reference to specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure. The disclosure may be embodied or carried out in various other specific embodiments and with various modifications or alterations from various aspects and applications of the disclosure without departing from the spirit of the disclosure. It is to be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.

Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings so that those skilled in the art to which the present disclosure pertains can easily carry out the embodiments. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

Reference in the expression of the disclosure to "one embodiment," "some embodiments," "an example," "a specific example," 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 disclosure. Furthermore, the particular features, structures, materials, or characteristics shown may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples presented in this disclosure can be combined and combined by one skilled in the art without being mutually inconsistent.

Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the expressions of the present disclosure, "plurality" means two or more unless specifically defined otherwise.

In order to clearly explain the present disclosure, components that are not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

Throughout the specification, when a device is referred to as being "connected" to another device, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another element interposed therebetween. In addition, when a device "includes" a certain constituent element, unless otherwise specified, it means that the other constituent element is not excluded, but may be included.

Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface are represented. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, modules, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, modules, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations performed are inherently mutually exclusive in some manner.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" include plural forms as long as the words do not expressly indicate a contrary meaning. The terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, elements, and/or components, but do not preclude the presence or addition of other features, regions, integers, steps, elements, components, and/or groups thereof.

Terms representing relative spatial terms such as "lower", "upper", and the like may be used to more readily describe one element's relationship to another element as illustrated in the figures. Such terms are intended to have not only the meaning indicated in the drawings, but also other meanings or executions of the device in use. For example, if the device in the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "under" and "beneath" all include above and below. The device may be rotated 90 or other angles and the terminology representing relative space is also to be interpreted accordingly.

Although not defined differently, including technical and scientific terms used herein, all have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Terms defined in commonly used dictionaries are to be additionally interpreted as having meanings consistent with those of related art documents and currently prompted messages, and should not be excessively interpreted as having ideal or very formulaic meanings unless defined.

At present, the explosion-proof valve of the lithium battery generally adopts an explosion-proof sheet structure and is used for bursting the explosion-proof sheet of the explosion-proof valve to release pressure when the lithium battery generates a large amount of gas due to thermal runaway. However, the explosion-proof sheet directly expands and breaks to damage the top cover of the explosion-proof valve, so that the explosion-proof valve is scrapped; and only after the gas pressure in the lithium battery reaches the critical value for bursting the explosion-proof sheet, the exhaust can be realized, and when the gas pressure does not reach the critical value, the pressure of the battery cannot be released, so that hidden danger exists. In addition, the existing lithium battery explosion-proof valve is lack of an alarm function for thermal runaway of the lithium battery, and potential safety hazards to users also exist. Moreover, the vent hole is inevitably arranged on the lithium battery explosion-proof valve, but the vent hole is not considered to be deficient in water resistance, dust resistance and the like, and the vent channel is possibly blocked by water or dust entering the lithium battery explosion-proof valve, so that the explosion-proof valve is disabled and other serious consequences are caused.

In view of this, the embodiment of the present disclosure may provide a battery explosion-proof valve, which realizes that the valve plug is driven by the air pressure of the lithium battery to perform air exhaust and automatic reset, thereby prolonging the service life. In addition, the battery explosion-proof valve can be matched with a sound production structure to give an alarm, and the purposes of dust prevention, water prevention and no influence on exhaust can be achieved.

Please refer to fig. 1 and fig. 2 together. Fig. 1 shows a schematic perspective view of a battery explosion-proof valve in an embodiment of the present disclosure. Fig. 2 shows a longitudinal section structure schematic diagram of the battery explosion-proof valve in fig. 1.

As shown in fig. 2, the battery explosion-proof valve 100 specifically includes: a valve casing, a valve core 102, an elastic telescopic piece 103, a sound production structure 104 and a dustproof and waterproof breathable film 105.

In fig. 1, the valve housing and the valve core 102 are illustratively cylindrical such that the battery explosion prevention valve 100 is generally cylindrical in shape.

Illustratively, the valve housing may be a split structure to enable internal installation of components. The valve housing includes a valve body 101 at an upper portion and a base 108 connected to a bottom of the valve body 101. The valve body 101 and the base 108 can be fixedly connected by welding, screwing or the like. An inner space is enclosed between the valve body 101 and the base 108.

The valve casing still be equipped with air intake portion 107 and the exhaust portion of inner space intercommunication, the valve casing bottom is located to air intake portion 107, the exhaust portion is located the lateral wall of valve casing. In the example of fig. 1, the air inlet 107 may be located at a lower end of the base 108. The cross section of the air inlet end can be circular corresponding to the valve body 101, so that the air inlet end is beneficial to rotating and fixing; of course, other shapes are possible. The air inlet is fixedly connected with a pressure relief part of the battery. In a specific embodiment, the battery explosion-proof valve 100 may be welded and fixed to and communicate with a pressure relief hole of a lithium battery top cover by welding (e.g., laser welding, etc.) for receiving gas exhausted from the pressure relief hole.

In fig. 1 and 2, the air vent portion is covered with a dust-and water-proof air-permeable film 105. In some embodiments, the air discharge portion may be a mouth portion, or a plurality of small holes, or a strip-shaped hole portion. For example, the exhaust portion may be at least one exhaust hole circumferentially continuously or sectionally provided along the side surface of the valve housing, that is, the exhaust hole surface shape may be a ring shape or an arc shape extending circumferentially along the side surface of the valve body 101. For example, there may be at least two exhaust holes, which are arc holes symmetrically disposed at two opposite positions on the side surface of the valve body 101; alternatively, it may be an annular hole.

The valve body 102 is disposed in the internal space corresponding to the air intake portion 107 and is disposed to be vertically movable in the internal space. The internal space may be configured to limit the valve core 102 to move only in a substantially vertical direction, for example, the air inlet 107 forms a funnel-shaped guide structure corresponding to a predetermined position for accommodating the valve core 102, and the internal space and the cross-sectional diameter of the valve core 102 are configured to prevent the valve core 102 from being supported by the guide structure when the valve core 102 returns after moving away from the air inlet 107, so that the valve core 102 can be guided back to the predetermined position by the guide structure.

The elastic expansion piece 103 is disposed in the inner space, and two ends of the elastic expansion piece respectively correspond to the valve core 102 and the valve body. Illustratively, the elastic expansion member 103 is a spring, and two ends of the elastic expansion member respectively abut against the upper surface of the valve core 102 and the inner top wall of the valve body 101.

As shown in fig. 2, the elastic expansion element 103 may be configured to have a certain compression deformation state, and form an elastic force to press the valve element 102 to block the air inlet 107.

Therefore, when thermal runaway occurs in the battery and a large amount of gas is released, the internal pressure of the battery shell rises sharply, and when the internal pressure exceeds the sum of the elastic force of the elastic expansion piece 103 and the gravity of the valve core 102, the valve core 102 is pushed away from the base 108 to open the air inlet part 107, the air outlet channel 106 between the air inlet part 107 and the air outlet part is opened, and the gas in the battery can be discharged from the air outlet hole. It can be understood that when the pressure relief is satisfied that the internal pressure of the battery case is less than the sum of the elastic force of the elastic expansion member 103 and the gravity of the valve core 102, the valve core 102 will return to the state of blocking the air inlet 107 under the elastic force of the elastic expansion member 103. As can be seen, the battery explosion-proof valve 100 in the embodiment of the present disclosure can be reused, and the service life is greatly extended; and the appearance of the battery and the atmosphere in the battery shell are not influenced, and the subsequent recovery and utilization are facilitated.

Moreover, the valve core 102 is driven by elastic force, and can be suitable for different pressure relief critical pressures by replacing springs with different elastic forces so as to be suitable for batteries with different models. In addition, because the gas inside the battery explosion-proof valve 100 flows in a single direction (is exhausted from the exhaust part upwards along the exhaust channel 106 from the air inlet), the internal atmosphere of the battery shell is not influenced in the battery production and formation process, a separate drying room is not required to be established for installing the explosion-proof valve for the battery, and the production cost is greatly reduced.

In fig. 2, the exhaust passage 106 is formed in a gap between the spool 102 and the valve body 101. In order to indicate the explosion risk of the battery in the battery explosion-proof valve 100, a sounding structure 104 may be further formed on the valve body 101 at a position where the exhaust passage 106 passes, for receiving the air flow and sounding.

Fig. 3 is a schematic structural diagram of a sounding structure according to an embodiment of the disclosure.

The sound emitting structure 200 includes a horizontal airflow passage 201, and the horizontal airflow passage 201 may be formed in the valve housing and has an airflow inlet 202. The airflow inlet 202 is communicated with the horizontal airflow channel 201 and the exhaust channel 106. The horizontal air flow path 201 is provided with an air outlet 203 on one side thereof. A blocking wall 204 is arranged in the horizontal airflow channel 201, and an end part 241 is formed by protruding towards the air outlet 203. The front surface (i.e. the left surface in fig. 2) of the blocking wall 204 faces the horizontal airflow channel 201 to face the airflow from the exhaust channel 106, and a first gap 205 communicating with the air outlet 203 is formed between the end portion 241 of the blocking wall 204 and the side wall of the air outlet 203 on the side of the horizontal airflow channel 201. The rear surface (i.e. the right surface in fig. 2) of the blocking wall forms an air flow chamber 206, and a second gap 207 communicating with the air outlet 203 is formed between the end portion 241 of the blocking wall 204 and the side wall of the air outlet 203 on the side of the air flow chamber 206. Although the end 241 of the dam wall 204 is illustrated in FIG. 2 as being square, in other examples, to facilitate directing the flow of the airflow, the end 241 of the dam wall 204 is pointed, such as a conical head.

The sound generating structure 200 is similar to a single-tone whistle, and the airflow in the horizontal airflow channel 201 impacts the air outlet 203 from the first gap 205, and when another part of the airflow passes through the blocking wall 204 in the airflow cavity 206, the airflow direction changes to form a circular airflow, and the airflow passes through the narrow second gap 207 at a high speed to cause airflow turbulence, so that vibration is caused, and an alarm sound is given out. The frequency of the sounding is related to the used materials and the size of the cavity design, the sound level depends on the speed of the exhaust speed, the faster the exhaust speed is, the higher the air pressure is, the louder the sounding is, and the severity of the explosion risk of the battery can be accurately prompted.

In fig. 1 and 2, the dustproof water-discharging air-permeable membrane 105 is provided so as to cover the air discharge portion, thereby preventing dust and water droplets from entering the interior. Specifically explaining the principle of the dustproof water-discharging breathable film 105: the gas particles are very fine, the capillary motion principle can be utilized under the state, the other side of the capillary can be smoothly permeated, the particles are large when water molecules are in a liquid state, the other side cannot be permeated according to the surface tension principle, and the waterproof and breathable effect is achieved at the moment. The waterproof and dustproof breathable film 105 can be made of materials such as Expanded Polytetrafluoroethylene (EPTFE), wherein the pore diameter of micropores of the expanded polytetrafluoroethylene material is 700 times larger than that of water vapor, air can be allowed to pass through smoothly while the waterproof effect is achieved, heat dissipation can be effectively achieved, inner wall fogging of a product is prevented, air pressure of an inner space and an outer space are balanced, and in addition, the expanded polytetrafluoroethylene material has the advantages of high and low temperature resistance (the temperature can reach 250 ℃ at most, and the extensibility can also keep 5% at the low temperature of 190 ℃), corrosion resistance (chemical inertness is shown for most solvents and chemicals), dust prevention (micropore channels are connected into a net-shaped three-dimensional structure in the film, dust can be separated due to even and dense micropore distribution, the effective dustproof effect is achieved, and particles with the size of 0.1 mu m can be captured at the minimum).

An embodiment of the present disclosure may also provide an explosion-proof battery device, including: battery and battery explosion-proof valve in the above embodiments. In some embodiments, the battery may be a lithium battery or other battery having a risk of explosion due to thermal runaway, and is not limited to a lithium battery. The battery has a cover body, such as an upper cover, provided with a pressure relief portion. The air inlet hole of the battery explosion-proof valve can be fixedly connected with the pressure relief part through fixing means such as welding and the like to form communication.

To sum up, the embodiment of the present disclosure provides a battery explosion-proof valve and an explosion-proof battery device using the same, including: a valve housing; a valve core disposed in the internal space corresponding to the air inlet portion and configured to be vertically movable in the internal space; the elastic telescopic piece is arranged in the inner space; two ends of the elastic expansion piece respectively correspond to the valve core and the valve shell, so that the valve core can expand and contract along with the valve core to block or open the air inlet part; the elastic expansion piece is abutted against the valve core until the air inlet part is blocked; when the valve core opens the air inlet part, a gap between the valve core and the valve shell forms an exhaust channel for communicating the air inlet part and the air outlet part; the sounding structure is formed on the valve shell, communicated with the exhaust passage and used for receiving airflow and sounding; and the dustproof and waterproof breathable film is arranged on the exhaust part in a covering manner. The valve core in the battery explosion-proof valve in the embodiment of the disclosure moves to open the exhaust passage when being impacted by battery gas and automatically resets after exhausting, so that the service life is long and the valve core is convenient to recycle. Inside the dustproof and waterproof ventilated membrane that the cooperation was covered in the portion of giving vent to anger effectively protected the case, by further promoting the life-span. In addition, the alarm can be given when exhausting by matching with a sounding structure formed on the valve shell, so that effective reminding is formed.

The above-described embodiments are merely illustrative of the principles of the present disclosure and their efficacy, and are not intended to limit the disclosure. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present disclosure. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present disclosure and be covered by the claims of the present disclosure.

Claims

1. A battery explosion-proof valve, comprising:

a valve housing having an internal space, and an intake portion and an exhaust portion communicating with the internal space; the air inlet part is arranged at the bottom of the valve shell, and the air outlet part is arranged on the side wall of the valve shell; the air inlet part is communicated with a pressure relief part of the battery;

a valve core disposed in the internal space corresponding to the air inlet portion and configured to be vertically movable in the internal space;

the elastic expansion piece is arranged in the inner space; two ends of the elastic expansion piece respectively correspond to the valve core and the valve shell, so that the valve core can expand and contract along with the valve core to block or open the air inlet part; the elastic expansion piece is pressed against the valve core until the air inlet part is blocked; when the valve core opens the air inlet part, an air exhaust channel for communicating the air inlet part and the air outlet part is formed in a gap between the valve core and the valve shell;

the sounding structure is formed on the valve shell, communicated with the exhaust passage and used for receiving airflow and sounding;

and the dustproof and waterproof breathable film is covered on the exhaust part.

2. The battery explosion prevention valve of claim 1 wherein the valve housing and valve core are cylindrical.

3. The battery explosion prevention valve as defined in claim 1 wherein the resilient bellows extends in the axial direction of the longitudinal direction of the valve housing.

4. The battery explosion-proof valve of claim 1, wherein the dust-proof, water-proof, and gas-permeable membrane is an expanded polytetrafluoroethylene material.

5. The battery explosion prevention valve of claim 1 wherein said vent portion comprises at least one vent hole circumferentially disposed continuously or in segments along said valve housing side surface.

6. The explosion-proof valve for battery as claimed in claim 5, wherein there are at least two air vents symmetrically disposed at two opposite positions of the side surface.

7. The battery explosion prevention valve of claim 1, wherein the sound emitting structure comprises:

a horizontal airflow passage formed in the valve housing and having an airflow inlet; the airflow inlet is communicated with the horizontal airflow channel and the exhaust channel;

an air outlet disposed on one side of the horizontal airflow channel;

the blocking wall is convexly arranged opposite to the air outlet to form an end part, the front surface of the blocking wall faces the horizontal airflow channel, and a first gap communicated with the air outlet is formed between the end part and the side wall of the air outlet on one side of the front surface; and an airflow cavity is formed behind the back surface of the blocking wall, and a second gap communicated with the air outlet is formed between the end part of the blocking wall and the side wall of the air outlet on one side of the airflow cavity.

8. The battery explosion prevention valve of claim 7 wherein said end is a pointed end.

9. An explosion-proof battery apparatus, comprising:

a battery body having a lid body provided with a pressure relief portion;

the battery explosion prevention valve according to any one of claims 1 to 8, wherein an air inlet portion thereof is fixedly communicated with the pressure relief portion.

10. The explosion-proof battery device of claim 9 wherein the battery body is a lithium battery.