Explosion-proof valve, battery monomer, battery pack and electric equipment

Abstract

The utility model discloses an explosion-proof valve, a battery monomer, a battery pack and electric equipment. The anti-explosion valve comprises a valve plate and a fire extinguishing bin, a fire extinguishing agent is arranged in the fire extinguishing bin, the fire extinguishing bin is arranged on one side of the valve plate, and the fire extinguishing agent can be released from the fire extinguishing bin. The fire extinguishing bin is arranged on the valve plate, the fire extinguishing agent is arranged in the fire extinguishing bin, and when the temperature of the battery is out of control, the explosion-proof valve is matched to be opened to be mixed with eruption substances, so that the battery can be better and rapidly cooled, and the effects of cooling, fire fighting and fire extinguishing are achieved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of batteries, and more specifically to an explosion-proof valve, a battery cell, a battery pack and an electrical device. Background Art

[0002] Lithium-ion batteries are currently common secondary batteries. Many lithium batteries and other secondary batteries (electrolyte shell cells) will produce a lot of gas and heat when they are used improperly (such as overcharging, negative pressure, high temperature, etc.) and damaged by the outside world (such as metal puncture short circuit, etc.). The battery will heat up rapidly and even catch fire and explode, which poses a common safety hazard. In order to avoid or mitigate the occurrence of such situations, explosion-proof valves have become a common device on batteries. Its mechanism of action is roughly described as follows: The explosion-proof valve is usually a metal sheet with dotted and linear metal notches on the surface. It is welded on the battery cover and includes explosion-proof valve protection patches and other supporting structures. When the battery produces heat improperly, the SEI film, electrolyte, etc. of the battery cell decompose and produce gas and release a certain amount of heat. At this time, the internal pressure of the battery rises rapidly, and the weak notches on the explosion-proof valve will rupture first, forming an open valve. At this time, the gas of the battery cell will be discharged from the valve port in large quantities to prevent the gas produced by the battery cell from accumulating in the shell and exploding due to excessive internal pressure. At the same time, as the gas is discharged, the heat loss of the battery is also accelerated, thereby cooling the battery cell.

[0003] However, if the battery cell produces gas and heat violently (such as high battery cell capacity and large short circuit impact area), opening the valve cannot reduce the battery to a safe temperature, and the battery diaphragm, positive and negative electrodes continue to heat up due to thermal decomposition. After the valve is opened, they will be exposed to oxygen in the outside air and further undergo oxidation and combustion reactions, releasing a large amount of heat, which will inevitably cause the combustion of nearby battery cells or other combustibles, resulting in thermal runaway, and the resulting safety accidents and property losses are unimaginable. Therefore, after the valve is opened, it is still necessary to increase measures to prevent the battery from heating up to avoid uncontrollable accidents.

[0004] Therefore, it is necessary to provide an explosion-proof valve, a battery cell, a battery pack and an electrical device to at least partially solve the above problems. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] In order to solve the problems of complex terminal assembly structure and low sealing reliability, the first aspect of the utility model provides an explosion-proof valve, comprising:

[0007] Valve plate;

[0008] A fire extinguishing chamber is provided with a fire extinguishing agent, the fire extinguishing chamber is arranged on one side of the valve plate, and the fire extinguishing agent can be released from the fire extinguishing chamber.

[0009] Optionally, the valve plate is provided with an opening, the opening is communicated with the fire extinguishing chamber, and the fire extinguishing agent is suitable for being loaded or released from the opening.

[0010] Optionally, it also includes:

[0011] A sealing patch is arranged on a side of the valve plate away from the fire extinguishing compartment, and the sealing patch can close the opening of the fire extinguishing compartment.

[0012] Optionally, it also includes:

[0013] A protective patch is arranged on a side of the valve plate away from the fire extinguishing chamber.

[0014] Optionally, the fire extinguishing chamber and the valve plate are made in one piece, and the fire extinguishing chamber and / or the valve plate are provided with notches.

[0015] Optionally, the valve sheet is provided with the notch near the edge;

[0016] The notch is arranged on a side of the fire extinguishing chamber away from the valve plate.

[0017] Optionally, the opening area accounts for 20%-80% of the area of ​​the valve sheet, and the area of ​​the valve sheet includes the opening area.

[0018] Optionally, the height of the fire extinguishing chamber is 0.5mm-20mm.

[0019] Optionally, the fire extinguishing agent is a dry powder fire extinguishing agent or an aerosol fire extinguishing agent.

[0020] A second aspect of the present invention provides a battery cell, comprising:

[0021] a housing having an opening;

[0022] A battery cell, the battery cell being accommodated in the housing;

[0023] A cover plate, the cover plate is suitable for closing the opening and is provided with an explosion-proof valve exhaust hole;

[0024] According to any one of the above technical solutions, the explosion-proof valve is arranged at the exhaust hole of the explosion-proof valve, and the fire extinguishing chamber is arranged on a side of the valve plate facing the battery cell.

[0025] Optionally, the explosion-proof valve exhaust hole is provided with an avoidance hole corresponding to the fire extinguishing chamber.

[0026] A third aspect of the present invention provides a battery pack, comprising a battery cell according to any one of the above technical solutions.

[0027] A fourth aspect of the present invention provides an electrical device, comprising a battery cell as described in any one of the above technical solutions or a battery pack as described in any one of the above technical solutions.

[0028] According to the explosion-proof valve, battery cell, battery pack and electrical equipment of the utility model, a fire extinguishing chamber is added on the basis of the existing explosion-proof valve structure, and a fire extinguishing agent is arranged in the fire extinguishing chamber. When the battery temperature is out of control, the explosion-proof valve opens and mixes with the erupting material, which can better cool the battery quickly and play a role in cooling and fire fighting. The newly added fire extinguishing chamber has a compact structure and basically does not occupy the volume of the battery itself. The cost of the entire fire extinguishing explosion-proof valve is relatively low, and the replacement and maintenance process is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0030] Figure 1 This is an exploded view of an explosion-proof valve according to a preferred embodiment of the utility model;

[0031] Figure 2 This is an exploded view of an explosion-proof valve according to a preferred embodiment of the utility model;

[0032] Figure 3 It is a cross-sectional view of an explosion-proof valve according to a preferred embodiment of the utility model;

[0033] Figure 4 This is an exploded view of an explosion-proof valve according to a preferred embodiment of the utility model;

[0034] Figure 5 It is a front view of a cover plate assembly according to a preferred embodiment of the utility model;

[0035] Figure 6 is a cross-sectional view of a cover plate assembly according to a preferred embodiment of the utility model;

[0036] Figure 7 A top view of a cover plate assembly according to a preferred embodiment of the present utility model;

[0037] Figure 8 It is a three-dimensional diagram of a cover plate according to a preferred embodiment of the utility model.

[0038] Description of reference numerals:

[0039] 100: Cover assembly 10: Cover

[0040] 11: Explosion-proof valve exhaust hole 12: Avoidance hole

[0041] 13: Pole assembly hole 14: Pole assembly hole

[0042] 15: Liquid injection hole 20: Explosion-proof valve

[0043] 21: Protective patch 22: Valve piece

[0044] 23: Fire extinguishing chamber 24: Fire extinguishing agent

[0045] 25: Sealing patch 26: Score DETAILED DESCRIPTION

[0046] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0047] In order to thoroughly understand the utility model, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the utility model thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the utility model are described in detail below, but in addition to these detailed descriptions, the utility model may also have other embodiments.

[0048] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0049] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in the present invention are for illustrative purposes only and are not restrictive.

[0050] The utility model discloses an explosion-proof valve 20, a battery cell, a battery pack and electrical equipment.

[0051] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0052] like Figure 1 , Figure 2 , Figure 3 As shown, in a preferred embodiment, an explosion-proof valve 20 includes: a valve plate 22 and a fire extinguishing chamber 23;

[0053] The valve plate 22 is used to close the explosion-proof valve exhaust hole 11; the explosion-proof valve exhaust hole 11 is arranged on the cover plate 10 of the battery; the valve plate 22 is usually a metal sheet, such as an aluminum alloy sheet, with dotted linear notches on the surface, which facilitates the timely opening of the valve when the battery produces gas and heat;

[0054] A fire extinguishing agent 24 is arranged in the fire extinguishing chamber 23 . The fire extinguishing chamber 23 is arranged on one side of the valve plate 22 . The fire extinguishing agent 24 can be released from the fire extinguishing chamber 23 .

[0055] After the explosion-proof valve 20 is installed on the cover plate 10 of the battery, the fire extinguishing chamber 23 will be embedded in the battery. Figure 5 , Figure 6 , Figure 7 When the battery temperature is out of control and the explosion-proof valve 20 opens, the gas in the battery cell will be discharged from the explosion-proof valve exhaust hole 11 in large quantities, changing the air pressure structure around the explosion-proof valve exhaust hole 11, and the fire extinguishing agent 24 in the fire extinguishing chamber 23 is driven by the air pressure to be released outward from the fire extinguishing chamber 23, and the fire extinguishing agent 24 is released to the outside and / or inside of the battery, and is mixed with the erupting material, which can better quickly cool the battery and play a role in cooling and fire extinguishing.

[0056] The explosion-proof valve 20 in this embodiment adds a fire extinguishing chamber 23 on the basis of the existing explosion-proof valve structure. The fire extinguishing chamber 23 is provided with a fire extinguishing agent 24. When the battery temperature is out of control, the explosion-proof valve 20 opens and mixes with the erupting material, which can better cool the battery quickly and play a role in cooling and fire fighting. The newly added fire extinguishing chamber 23 has a compact structure and basically does not occupy the volume of the battery itself. The cost of the entire fire extinguishing explosion-proof valve is relatively low, and the replacement and maintenance process is more convenient.

[0057] The fire extinguishing chamber 23 includes but is not limited to a rectangular parallelepiped structure, and can also be designed as a cylinder, an elliptical cylinder, a prism, or other suitable shapes.

[0058] In one embodiment, the fire extinguishing chamber 23 is arranged on the side of the valve plate 22 facing the battery cell. After the explosion-proof valve is assembled, the fire extinguishing chamber 23 can be embedded in the battery and will not protrude from the battery cover 10 to avoid being damaged by contact.

[0059] In one embodiment, if Figure 2 , Figure 3As shown, the valve plate 22 is provided with an opening, which is communicated with the fire extinguishing chamber 23, and the fire extinguishing agent 24 is suitable for loading or releasing from the opening. When the explosion-proof valve 20 is opened, the valve plate 22 is cracked to open the opening of the fire extinguishing chamber 23, and the fire extinguishing agent 24 can be released outward from the fire extinguishing chamber 23, and the fire extinguishing agent 24 is released to the outside and / or inside of the battery.

[0060] The shape of the opening is consistent with the shape of the fire extinguishing chamber 23, and can be rectangular, circular, elliptical or other polygonal shapes.

[0061] In one embodiment, if Figure 4 As shown, the explosion-proof valve 20 also includes:

[0062] The sealing patch 25 is arranged on a side of the valve plate 22 away from the fire extinguishing chamber 23 . The sealing patch 25 can close the opening of the fire extinguishing chamber 23 , and the fire extinguishing agent 24 is sealed in the fire extinguishing chamber 23 by means of the sealing patch 25 .

[0063] The sealing patch 25 can be a metal sheet, such as an aluminum alloy sheet, and can be fixedly connected to the valve plate 22 by bonding, welding, etc. A positioning groove can be provided on the valve plate 22 corresponding to the sealing patch 25, and the shape of the groove is adapted to the sealing patch 25.

[0064] The sealing patch 25 may also be provided with dotted and linear notches to facilitate rupture and release of the fire extinguishing agent 24 .

[0065] In one embodiment, the explosion-proof valve 20 further includes:

[0066] A protective patch 21 is arranged on a side of the valve plate 22 away from the fire extinguishing chamber (23).

[0067] The protective patch 21 is used to protect the valve plate 22 from being scratched by sharp objects outside and from being dirty. The protective patch 21 is usually a metal sheet, such as an aluminum alloy sheet, with some linear notches on the surface to facilitate timely opening of the valve when the battery produces gas and heat.

[0068] The protection patch 21 can also seal the opening of the fire extinguishing chamber 23 alone, and the fire extinguishing agent 24 is sealed in the fire extinguishing chamber 23 by means of the protection patch 21. In this case, the sealing patch 25 does not need to be provided on the valve plate 22.

[0069] In one embodiment, if Figure 1 As shown, the fire extinguishing chamber 23 and the valve plate 22 are made in one piece, and the fire extinguishing chamber 23 and / or the valve plate 22 are provided with notches 26, which are used to guide the fire extinguishing chamber 23 and the valve plate 22 to crack, thereby meeting the basic valve opening requirement.

[0070] In one embodiment, if Figure 1 As shown, the valve plate 22 is provided with a notch 26 near the edge to facilitate the high-pressure airflow to crack the valve plate 22;

[0071] A notch 26 is provided on one side of the fire extinguishing chamber 23 away from the valve plate 22 . For example, a notch 26 may be provided on the bottom of the fire extinguishing chamber 23 to facilitate the high-pressure airflow to crack the fire extinguishing chamber 23 .

[0072] The fire extinguishing chamber 23 and the valve plate 22 can be made of an aluminum alloy sheet in one piece.

[0073] In one embodiment, the opening area of ​​the fire extinguishing chamber 23 accounts for 20%-80% of the area of ​​the valve plate 22, and the area of ​​the valve plate 22 includes the opening area. By setting the area relationship between the two, it can be ensured that the fire extinguishing agent 24 can be effectively released outward through the opening, and the fire extinguishing agent 24 is released to the outside and / or inside of the battery.

[0074] In one embodiment, the height of the fire extinguishing chamber 23 is 0.5 mm to 20 mm, which does not occupy too much space in the battery and does not affect the installation space of the battery cell when embedded in the battery. Figure 3 As shown in , the distance from the position where the fire extinguishing chamber 23 is connected to the valve plate 22 to the bottom of the fire extinguishing chamber 23 is a height h, which can be selected from 0.5 mm to 20 mm.

[0075] The mechanism of release of the extinguishing agent 24 is as follows:

[0076] First, the heat generated by the battery cell causes the fire extinguishing agent 24 in the fire extinguishing chamber 23 to pyrolyze and produce gas, which first opens the valve plate 22;

[0077] Second, the gas generated by the electrolyte of the battery cell itself opens the valve plate 22 before the fire extinguishing agent 24;

[0078] Third, the two mechanisms mentioned above produce gas almost simultaneously and cause the valve to open.

[0079] The specific valve opening mechanism can select the appropriate type of fire extinguishing agent 24 based on the pyrolysis temperature and pyrolysis speed according to specific actual needs.

[0080] In one embodiment, the fire extinguishing agent 24 is a dry powder fire extinguishing agent or an aerosol fire extinguishing agent.

[0081] Dry powder fire extinguishing materials are preferably mainly alkali metal compounds containing bicarbonate, such as potassium bicarbonate KHCO3, etc. The main temperature range of its thermal decomposition is 60-300°C, and it mainly decomposes into water and carbon dioxide when heated, which can quickly absorb the heat released by the battery out of control to avoid further expansion of the impact of safety accidents. Water has a large specific heat and can quickly absorb heat and gasify into water vapor. CO2 can isolate oxidation and prevent the occurrence of oxidative combustion reactions.

[0082] Aerosol fire extinguishing agents can be divided into "high temperature technology aerosol" and "non-high temperature technology aerosol". "High temperature technology aerosol" is a solid fuel mixture that produces a sufficient concentration of suspended solid particles and inert gas through its own combustion reaction, which is released into the fire space to suppress the flame and extinguish the flame. According to its performance, it is suitable for the fire extinguishing environment of this application.

[0083] In addition to the dry powder fire extinguishing agent or aerosol fire extinguishing agent, the fire extinguishing chamber 23 can still be replaced with other types of fire retardants according to the safety requirements of the battery cells, and is not limited to solid and liquid fire extinguishing functional materials.

[0084] The second aspect of the present utility model provides a battery cell, comprising: a housing, a battery cell and a cover plate 10;

[0085] The housing has an open opening;

[0086] The battery cell is contained in the housing;

[0087] The cover plate 10 is suitable for closing the opening and is provided with an explosion-proof valve exhaust hole 11;

[0088] According to any one of the above embodiments, the explosion-proof valve 20 is arranged at the explosion-proof valve exhaust hole 11, and the fire extinguishing chamber 23 is arranged on the side of the valve plate 22 facing the battery cell. Figure 5 , Figure 6 , Figure 7 , Figure 8 shown.

[0089] The explosion-proof valve exhaust hole 11 is a countersunk hole structure with a mesh support structure inside, which can not only ensure the basic strength of the cover plate 10, but also enable the gas to be smoothly transmitted to the explosion-proof valve 20 during production, forcing the weak part of the valve plate 22 to rupture in time to complete the valve opening action.

[0090] The protective patch 21 and the valve plate 22 can be welded and fixed to the exhaust hole 11 of the explosion-proof valve.

[0091] The cover plate 10 is also provided with structures such as a pole assembly hole 13, a pole assembly hole 14, and a liquid injection hole 15, and their functions can refer to the prior art and will not be described in detail here.

[0092] In one embodiment, if Figure 8 As shown, the explosion-proof valve exhaust hole 11 is provided with an avoidance hole 12 corresponding to the fire extinguishing chamber 23. No mesh structure is provided in the avoidance hole 12. The inner size of the avoidance hole 12 is larger than the corresponding size of the fire extinguishing chamber 23. The fire extinguishing chamber 23 is prevented from interfering with the cover plate 10 within a certain tolerance range, thereby preventing the fire extinguishing chamber 23 from being deformed or inconvenient to assemble.

[0093] The cover plate 10 and the explosion-proof valve 20 are both components of the cover plate assembly 100. The cover plate assembly 100 is arranged at the top of the battery housing. Its function can refer to the existing technology and will not be described in detail here.

[0094] An embodiment of the utility model further provides a battery pack, comprising the battery cells described in any one of the above embodiments, wherein a plurality of battery cells can be connected in series and / or in parallel in the battery pack to meet the design requirements of parameters such as voltage and current of the battery pack.

[0095] An embodiment of the utility model further provides an electrical device, including a power mechanism, and also including a battery cell or a battery pack as described in any one of the above embodiments, wherein the battery cell or the battery pack provides electrical energy for the power mechanism.

[0096] The electrical equipment may be a vehicle, a ship, a spacecraft, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The present application embodiment does not impose any special restrictions on the above-mentioned electrical equipment.

[0097] In one embodiment, the power mechanism includes an electric motor and a reducer, and the battery cells can form a battery module. The battery pack is arranged on the electrical equipment to provide electrical energy for the electric motor.

[0098] The shape of the battery cell in this embodiment is rectangular, but may also be cylindrical, square or other shapes.

[0099] An explosion-proof valve, a battery cell, a battery pack and an electrical device according to the utility model have the following characteristics:

[0100] The present application solves or improves the thermal runaway safety problem of the battery by adding an explosion-proof valve device inside the battery cell, while the prior art improves the thermal runaway safety problem of the battery cell by using an external fire extinguishing device on the battery cell.

[0101] The fire extinguishing agent used in the present application is mainly a dry powder fire extinguishing agent or an aerosol fire extinguishing agent, which is easy to store and replace, while the fire extinguishing agent used in the prior art is mainly a fire fighting liquid.

[0102] The present application has a compact structure, low cost, and is more user-friendly for maintenance and replacement, whereas the prior art battery cell external fire extinguishing device has a more complex structure and a higher cost.

[0103] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0104] In understanding the scope of the present invention, the term "comprising" and its derivatives as used herein are intended to be open terms, which specify the existence of the recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "including", "having" and their derivatives.

[0105] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0106] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0107] The utility model has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model.

Claims

1. An explosion-proof valve, characterized in that: include: Valve plate (22); A fire extinguishing chamber (23), wherein a fire extinguishing agent (24) is arranged in the fire extinguishing chamber (23), the fire extinguishing chamber (23) is arranged on one side of the valve plate (22), and the fire extinguishing agent (24) can be released from the fire extinguishing chamber (23).

2. The explosion-proof valve according to claim 1, characterized in that: The valve plate (22) is provided with an opening, the opening is communicated with the fire extinguishing chamber (23), and the fire extinguishing agent (24) is suitable for being loaded or released from the opening.

3. The explosion-proof valve according to claim 2, characterized in that: Also includes: A sealing patch (25), wherein the sealing patch (25) is arranged on a side of the valve plate (22) away from the fire extinguishing chamber (23), and the sealing patch (25) can close the opening of the fire extinguishing chamber (23).

4. The explosion-proof valve according to claim 1 or 3, characterized in that: Also includes: A protective patch (21), wherein the protective patch (21) is arranged on a side of the valve plate (22) away from the fire extinguishing chamber (23).

5. The explosion-proof valve according to claim 1, characterized in that: The fire extinguishing chamber (23) and the valve plate (22) are made in one piece, and the fire extinguishing chamber (23) and / or the valve plate (22) are provided with notches (26).

6. The explosion-proof valve according to claim 5, characterized in that: The valve plate (22) is provided with the notch (26) near the edge; The notch (26) is provided on a side of the fire extinguishing chamber (23) away from the valve plate (22).

7. The explosion-proof valve according to claim 2, characterized in that: The opening area accounts for 20%-80% of the area of ​​the valve plate (22), and the area of ​​the valve plate (22) includes the opening area.

8. The explosion-proof valve according to claim 1, characterized in that: The height of the fire extinguishing chamber (23) is 0.5 mm-20 mm.

9. The explosion-proof valve according to any one of claims 1-3 and 5-8, characterized in that: The fire extinguishing agent (24) is a dry powder fire extinguishing agent or an aerosol fire extinguishing agent.

10. A battery cell, characterized in that: include: a housing having an opening; A battery cell, the battery cell being accommodated in the housing; A cover plate (10), the cover plate (10) being suitable for closing the opening and being provided with an explosion-proof valve exhaust hole (11); According to the explosion-proof valve (20) according to any one of claims 1 to 9, the explosion-proof valve (20) is arranged at the explosion-proof valve exhaust hole (11), and the fire extinguishing chamber (23) is arranged on a side of the valve plate (22) facing the battery cell.

11. The battery cell according to claim 10, characterized in that: The explosion-proof valve exhaust hole (11) is provided with an avoidance hole (12) corresponding to the fire extinguishing chamber (23).

12. A battery pack, characterized in that: Comprising a battery cell according to any one of claims 10-11.

13. An electrical equipment, characterized in that: It comprises the battery cell according to any one of claims 10-11 or the battery pack according to claim 12.

Images