Battery top cover with fire-fighting function and single battery

Abstract

The utility model provides a battery top cover with a fire-fighting function and a single battery, and relates to the technical field of batteries, the battery top cover comprises a cover plate, a sealing plate, a pole and an anti-explosion valve, the bottom surface of the cover plate is sunken to form a concave cavity; the sealing plate is fixedly arranged on the bottom surface of the cover plate, and the sealing plate and the concave cavity define a containing cavity filled with a fire-fighting agent; the pole penetrates through the sealing plate through the insulating part and extends to the outer side of the cover plate; the anti-explosion valve is arranged on the sealing plate and communicates with the external environment, the sealing plate is provided with at least one weak opening communicating with the containing cavity, and the breaking pressure of the weak opening is smaller than that of the anti-explosion valve; and when the internal pressure of the battery is increased to the breaking pressure of the weak opening, the weak opening is broken, and the fire-fighting agent is released. According to the battery top cover disclosed by the utility model, accurate early-stage fire fighting response and directional fire extinguishing of a single battery level can be realized. And compared with module-level fire fighting needing large-area fire extinguishing agent spraying, agent waste is remarkably reduced, and the fire extinguishing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery top cover with fire-fighting function and a single battery cell. Background Technology

[0002] With the rapid development of new energy technologies, lithium-ion batteries are widely used in electric vehicles, energy storage systems, and other fields due to their advantages such as high energy density and long cycle life. However, in actual use, factors such as overcharging, over-discharging, short circuits, or external mechanical impacts can cause thermal runaway in individual cells, leading to safety accidents such as fires and explosions. Especially in battery modules composed of multiple individual cells, if one cell experiences thermal runaway, the resulting high temperature, flames, or projectiles can rapidly spread to adjacent cells, causing the entire module to fail and even resulting in serious property damage and personal injury.

[0003] Currently, safety protection measures for battery thermal runaway are mainly divided into two categories: module-level fire suppression systems and passive protection for individual batteries. Module-level fire suppression systems typically extinguish the fire by spraying extinguishing agents (such as heptafluoropropane and perfluorohexanone) onto the entire battery module. However, this method has significant drawbacks: First, in the early stages of thermal runaway, only a single cell is often involved, but module-level fire suppression requires spraying extinguishing agents onto the entire system, resulting in wasted resources and low response efficiency; second, due to the compact structure of battery modules, it is difficult to accurately target the faulty cell with extinguishing agents, requiring large amounts of spray and a long duration to effectively control the fire, delaying the optimal response time. Utility Model Content

[0004] In view of this, this utility model proposes a battery top cover and a single battery with fire protection function. By integrating the fire protection structure into the battery top cover, rapid and precise fire protection at the single battery level is achieved, avoiding the lag of module-level fire protection and improving the overall safety of the battery system.

[0005] The technical solution of this utility model is implemented as follows:

[0006] In a first aspect, this utility model provides a battery top cover with fire-fighting function, comprising:

[0007] The cover plate has a recessed bottom surface that forms a cavity;

[0008] The sealing plate is fixedly installed on the bottom surface of the cover plate, and together with the concave cavity, it forms a receiving chamber filled with fire-fighting agent;

[0009] The pole extends through the insulating component through the sealing plate and to the outside of the cover plate;

[0010] An explosion-proof valve, installed on the sealing plate and connected to the external environment, is used to release pressure when the internal pressure of the battery exceeds a threshold.

[0011] The sealing plate has at least one weak opening that communicates with the receiving chamber. The breaking pressure of the weak opening is less than the breaking pressure of the explosion-proof valve. When the internal pressure of the battery rises to the breaking pressure of the weak opening, the weak opening ruptures and the fire extinguishing agent is released.

[0012] Based on the above technical solution, preferably, the sealing plate has an upwardly extending first cylindrical part and a second cylindrical part, the first cylindrical part and the second cylindrical part respectively pass through the top surface of the cover plate and are fixedly connected to the cover plate, the pole passes through the first cylindrical part and is sealed and isolated from the sealing plate by an insulating component, and the explosion-proof valve is installed in the second cylindrical part.

[0013] Based on the above technical solution, preferably, the cover plate is provided with a first mounting hole and a second mounting hole, the upper end of the first cylindrical part is fixedly connected to the first mounting hole, and the upper end of the second cylindrical part is fixedly connected to the second mounting hole.

[0014] Based on the above technical solution, preferably, the insulating component includes a first insulating part and a second insulating part. The first insulating part covers the bottom surface of the sealing plate, and the second insulating part is wrapped between the outer periphery of the pole post and the inner side of the first cylindrical part. The second insulating part and the first insulating part are integrally formed. The lower end of the pole post extends to the bottom surface of the first insulating part. The first insulating part is provided with a clearance hole corresponding to the weak opening and the explosion-proof valve.

[0015] Based on the above technical solution, preferably, the bottom of the pole post has a limiting part that is partially embedded in the first insulating part, the limiting part is used to connect with the pole tab, and the pole post, the insulating part and the sealing plate are integrally formed by injection molding.

[0016] Based on the above technical solution, preferably, the contact surface between the second insulating part and the pole post and / or the first cylindrical part is provided with a first concave-convex interlocking structure that cooperates with each other.

[0017] Based on the above technical solution, preferably, a plurality of mutually cooperating second concave-convex interlocking structures are provided on the contact surface between the first insulating part and the sealing plate.

[0018] Based on the above technical solution, preferably, the sealing plate is further provided with an upwardly extending third cylindrical part, the cover plate is provided with a third mounting hole, the third cylindrical part and the third mounting hole are fixedly connected, and the connection between the third cylindrical part and the sealing plate is provided with a liquid injection hole.

[0019] Based on the above technical solution, preferably, the top surface of the cover plate is provided with a liquid inlet that communicates with the receiving chamber for adding fire-fighting agent into the receiving chamber, and the liquid inlet is fixedly provided with a sealing component.

[0020] Secondly, this utility model discloses a single battery, including a shell, a core pack, and a battery top cover with fire-fighting function as described in the first aspect, characterized in that: the core pack is disposed inside the shell, the battery top cover with fire-fighting function is disposed at the opening of the shell, the sealing plate is fixedly connected to the shell, and the electrode post and the electrode tab on the core pack are welded.

[0021] The present invention has the following advantages over the prior art:

[0022] (1) By setting the breaching pressure of the weak point below that of the explosion-proof valve, the fire extinguishing agent can be released rapidly in the early stage of battery thermal runaway (before the pressure reaches the explosion-proof valve threshold), achieving a precise early fire response. This solves the problem of delayed response in traditional module-level fire suppression, preventing the fire from spreading to adjacent cells. The fire extinguishing agent containment chamber is directly integrated into the top cover of the individual battery, and the extinguishing agent only acts on the inside of the faulty cell after release, achieving targeted fire suppression at the individual battery level. Compared with module-level fire suppression, which requires spraying extinguishing agent over a large area, this significantly reduces agent waste and improves fire suppression efficiency.

[0023] (2) By setting the insulating parts as a first insulating part and a second insulating part that are interconnected, with the first insulating part covering the bottom surface of the sealing plate, it is possible to achieve electrical isolation between the core pack and the sealing plate after the square battery is assembled, and the second insulating part is wrapped between the outer periphery of the electrode post and the inner side of the first cylindrical part, thereby achieving sealed electrical isolation between the electrode post and the first cylindrical part. The second insulating part and the first insulating part are integrally formed, which can simplify the production process and reduce the assembly difficulty.

[0024] (3) By providing a first interlocking structure that cooperates with each other on the contact surface between the second insulating part and the pole post and the first cylindrical part, and by providing a number of second interlocking structures that cooperate with each other on the contact surface between the first insulating part and the sealing plate, the sealing effect at the connection between the pole post and the sealing plate can be improved, and electrolyte leakage can be prevented.

[0025] (4) The third cylindrical part can provide a liquid channel to isolate the liquid injection channel from the fire-fighting agent in the containment chamber. The opening of the third cylindrical part extends to the top surface of the cover plate, which makes it convenient for the liquid injection head to extend into the third cylindrical part and inject electrolyte into the shell through the liquid injection hole. Thus, the electrolyte injection and the fire-fighting system are independent of each other. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a first-view perspective three-dimensional structural diagram of the battery top cover with fire-fighting function disclosed in this utility model.

[0028] Figure 2 This is a second-view perspective three-dimensional structural diagram of the battery top cover with fire-fighting function disclosed in this utility model.

[0029] Figure 3 This is a first-view exploded view of the battery top cover with fire-fighting function disclosed in this utility model.

[0030] Figure 4 This is a second-view exploded schematic diagram of the battery top cover with fire-fighting function disclosed in this utility model.

[0031] Figure 5 This is a top view of the fire-fighting function disclosed in this utility model;

[0032] Figure 6 for Figure 5 Planar sectional view at point AA;

[0033] Figure 7 This is a three-dimensional structural diagram of the single battery disclosed in this utility model;

[0034] Figure label:

[0035] 1. Cover plate; 11. Cavity; 12. First mounting hole; 13. Second mounting hole; 14. Third mounting hole; 15. Filling port; 16. Sealing component; 2. Sealing plate; 20. Weak opening; 21. First cylindrical part; 22. Second cylindrical part; 23. Third cylindrical part; 231. Injection hole; 3. Pole post; 31. Limiting part; 4. Explosion-proof valve; 5. Insulating component; 51. First insulating part; 52. Second insulating part; 511. Clearance hole; 512. First concave-convex interlocking structure; 513. Second concave-convex interlocking structure; 6. Housing; 7. Core package. Detailed Implementation

[0036] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0037] like Figure 1 As shown, combined with Figure 2-6 This utility model discloses a battery top cover with fire protection function, including a cover plate 1, a sealing plate 2, an electrode post 3 and an explosion-proof valve 4.

[0038] The cover plate 1 is made of metal, preferably aluminum plate, and has a square plate structure. The bottom surface of the cover plate 1 is recessed to form a cavity 11, which together with the sealing plate 2 forms a chamber for containing fire-fighting agent. At the same time, the cavity 11 structure can maintain the overall structural strength of the top cover.

[0039] Sealing plate 2, fixed to the bottom surface of cover plate 1, is also made of metal and forms a sealed receiving chamber with cavity 11. The receiving chamber is filled with a fire extinguishing agent, such as perfluoroacetone solution. A weak opening 20 is provided on sealing plate 2, the pressure of which is lower than the opening threshold of explosion-proof valve 4. Through a pressure-sensitive mechanism, the fire extinguishing agent is preferentially released in the early stage of thermal runaway.

[0040] The pole post 3 passes through the sealing plate 2 and extends to the outside of the cover plate 1 through the insulating part 5, so as to achieve electrical connection while avoiding short circuit caused by contact of fire extinguishing agent with pole post 3.

[0041] An explosion-proof valve 4 is installed on the sealing plate 2 and connected to the external environment. It is used to release pressure when the internal pressure of the battery exceeds a threshold. The rupture pressure of the weak port 20 is lower than that of the explosion-proof valve 4. When the internal pressure of the battery reaches the rupture pressure of the weak port 20, the weak port 20 ruptures, and the extinguishing agent is injected into the battery. The weak port 20 activates before the explosion-proof valve 4, achieving early intervention. If the extinguishing agent fails to completely control the fire, the explosion-proof valve 4 activates to release pressure at a higher pressure to prevent an explosion. Through a graded response mechanism, the safety requirements of the entire thermal runaway cycle are covered.

[0042] In this embodiment, the thickness of the weak opening 20 is 0.05-0.1mm. It can be made of the same material as the explosion-proof valve 4, but can withstand a breaking pressure of 80%-90% of the breaking pressure of the explosion-proof valve 4.

[0043] By setting the breaching pressure of the weak point 20 below that of the explosion-proof valve 4, the fire extinguishing agent can be released rapidly in the early stages of battery thermal runaway (before the pressure reaches the threshold of the explosion-proof valve 4), achieving a precise early fire response. This solves the problem of delayed fire response in traditional module-level fire suppression systems and prevents the fire from spreading to adjacent cells.

[0044] The fire extinguishing agent containment chamber is directly integrated into the top cover of the individual battery cell. After the extinguishing agent is released, it only acts on the inside of the faulty cell, achieving targeted fire suppression at the individual battery level. Compared to module-level fire suppression, which requires spraying extinguishing agent over a large area, this significantly reduces agent waste and improves fire suppression efficiency.

[0045] To provide a mounting base for the pole post 3 and the explosion-proof valve 4, the sealing plate 2 is provided with an upwardly extending first cylindrical part 21 and a second cylindrical part 22. The first cylindrical part 21 and the second cylindrical part 22 pass through the top surface of the sealing plate 1 and are fixedly connected to the sealing plate 1. The tops of the first cylindrical part 21 and the second cylindrical part 22 are flush with the top surface of the sealing plate 1. Since both the sealing plate 2 and the sealing plate 1 are made of metal, the top openings of the first cylindrical part 21 and the second cylindrical part 22 are connected to the top surface of the sealing plate 1 by welding.

[0046] In this embodiment, the electrode post 3 penetrates the first cylindrical portion 21 and is electrically isolated from the sealing plate 2 by means of the insulating member 5. It can be understood that the insulating member 5 is at least partially located between the electrode post 3 and the first cylindrical portion 21, so that the electrode post 3 and the first cylindrical portion 21 are electrically isolated. At the same time, the insulating member 5 between the electrode post 3 and the first cylindrical portion 21 can ensure the sealing of the connection between the electrode post 3 and the first cylindrical portion 21, and prevent electrolyte from leaking from the connection between the electrode post 3 and the first cylindrical portion 21.

[0047] In this embodiment, the explosion-proof valve 4 is installed inside the second cylindrical portion 22. Specifically, the explosion-proof valve 4 is located at the connection between the second cylindrical portion 22 and the sealing plate 2. The structure of the explosion-proof valve 4 is existing technology. The second cylindrical portion 22 provides a mounting base for the explosion-proof valve 4 and allows the explosion-proof valve 4 to communicate with the external environment through the second cylindrical portion 22, establishing a pressure relief channel.

[0048] It is worth noting that after the sealing plate 2 and the cover plate 1 are assembled, the overall structural strength of the cover plate 1 can be improved by setting the first cylindrical part 21 and the second cylindrical part 22, thereby improving the structural strength of the entire battery top cover.

[0049] In the above embodiment, the cover plate 1 has a first mounting hole 12 and a second mounting hole 13. The upper end of the first cylindrical portion 21 is fixedly connected to the first mounting hole 12, and the upper end of the second cylindrical portion 22 is fixedly connected to the second mounting hole 13. The first cylindrical portion 21 and the first mounting hole 12 are welded together, and the second cylindrical portion 22 and the second mounting hole 13 are welded together.

[0050] In this embodiment, the inner contour of the first cylindrical portion 21 is adapted to the outer contour of the pole post 3, and the inner contour of the second cylindrical portion 22 is adapted to the outer contour of the explosion-proof valve 4.

[0051] In some embodiments, the insulating component 5 includes a first insulating portion 51 and a second insulating portion 52. The first insulating portion 51 covers the bottom surface of the sealing plate 2, enabling electrical isolation between the core pack 7 and the sealing plate 2 after the square battery is assembled. The second insulating portion 52 wraps between the outer periphery of the electrode post 3 and the inner side of the first cylindrical portion 21, thereby achieving sealed electrical isolation between the electrode post 3 and the first cylindrical portion 21. The second insulating portion 52 and the first insulating portion 51 are integrally formed, which simplifies the production process and reduces assembly difficulty. The lower end of the electrode post 3 extends to the bottom surface of the first insulating portion 51, facilitating welding with the upper tab of the core pack 7. The first insulating portion 51 has a clearance hole 511 corresponding to the weak point 20 and the explosion-proof valve 4, ensuring unobstructed channels for the release of fire extinguishing agent and pressure relief.

[0052] In the above embodiments, the pole post 3 is a columnar structure, which can be cylindrical or square. Preferably, the pole post 3 in this embodiment is cylindrical, which facilitates assembly.

[0053] In some implementations, the bottom of the pole post 3 has a limiting portion 31 that is partially embedded in the first insulating portion 51. The limiting portion 31 is used to connect with the electrode tab. In this embodiment, the limiting portion 31 is set to a square structure. In this way, when the pole post 3 is set to a cylindrical shape, the limiting portion 31 is embedded in the first insulating portion 51, which can prevent the pole post 3 from rotating relative to the sealing plate 2. At the same time, the limiting portion 31 can increase the connection area between the electrode tab and the pole post 3, so that the outer diameter of the pole post 3 does not need to be set too large.

[0054] In this embodiment, the pole post 3, the insulating component 5, and the sealing plate 2 are integrally molded by injection molding, which can achieve a perfect combination of metal and plastic parts, improve the overall strength of the top cover structure, the conductivity and sealing performance of the pole post 3, and optimize the production process.

[0055] In this embodiment, the insulating component 5 is made of rigid plastic. Although the electrode post 3, the insulating component 5 and the sealing plate 2 are integrally formed by injection molding, which can achieve electrical isolation between the electrode post 3 and the sealing plate 2, in order to prevent electrolyte leakage along the connection between the sealing plate 2 and the electrode post 3, this embodiment also provides the following technical solution.

[0056] Specifically, in this embodiment, a first concave-convex interlocking structure 512 is provided on the contact surface between the second insulating part 52 and the pole post 3 and the first cylindrical part 21. This mechanical interlocking method of concave-convex fit achieves a tight fit between the insulating part 5 and the metal part. The concave-convex structure increases the contact area, improves the sealing effect, and prevents electrolyte leakage.

[0057] In addition, a plurality of mutually cooperating second concave-convex interlocking structures 513 are provided on the contact surface between the first insulating part 51 and the sealing plate 2. Preferably, the second concave-convex interlocking structures 513 are provided on the outer periphery of the second insulating part 52. In this way, when the electrolyte enters the contact surface between the first insulating part 51 and the sealing plate 2, it can be blocked by the second concave-convex interlocking structures 513, thereby avoiding or reducing the leakage of electrolyte between the second insulating part 52 and the first cylindrical part 21.

[0058] The first concave-convex interlocking structure 512 and the second concave-convex interlocking structure 513 are both protrusions and recesses that cooperate with each other.

[0059] In some embodiments, the sealing plate 2 also has an upwardly extending third cylindrical portion 23, and the cover plate 1 has a third mounting hole 14. The third cylindrical portion 23 and the third mounting hole 14 are fixedly connected, and the connection between the third cylindrical portion 23 and the sealing plate 2 has a liquid injection hole 231. With this configuration, the third cylindrical portion 23 can provide a liquid channel, which isolates the liquid injection channel from the fire-fighting agent in the containing chamber. The opening of the third cylindrical portion 23 extends to the top surface of the cover plate 1, which facilitates the insertion of the liquid injection head into the third cylindrical portion 23 and the addition of electrolyte to the inside of the housing 6 through the liquid injection hole 231. This achieves that the electrolyte addition and the fire-fighting system are independent of each other.

[0060] It is worth noting that after the electrolyte is added, the sealing aluminum head can be welded to the opening of the third cylindrical part 23 to seal the injection hole 231.

[0061] In some implementations, the top surface of the cover plate 1 has a liquid inlet 15 that communicates with the receiving chamber for adding fire extinguishing agent into the receiving chamber. The liquid inlet 15 is fixedly equipped with a sealing member 16. After the entire battery top cover is assembled, a certain volume of fire extinguishing agent is added into the receiving chamber through the liquid inlet 15, and then the liquid inlet 15 is sealed by the sealing member 16. For example, the sealing aluminum head can be welded to the liquid inlet 15 to ensure that the fire extinguishing agent does not leak.

[0062] It should be noted that the depth of the cavity 11 on the cover plate 1 in this embodiment is 2-5mm. The depth of the cavity 11 determines the volume of the fire extinguishing agent, ensuring that it can accommodate a minimum dose of fire extinguishing agent sufficient to suppress thermal runaway, and avoiding excessive increase in battery volume energy density loss.

[0063] This embodiment also discloses a single-cell battery, as shown in the attached diagram. Figure 7 As shown, the battery includes a housing 6, a core pack 7, and a battery top cover with fire-fighting function as described in the first aspect, characterized in that: the core pack 7 is disposed inside the housing 6, the battery top cover with fire-fighting function is disposed at the opening of the housing 6, the sealing plate 2 is fixedly connected to the housing 6, and the electrode post 3 and the electrode tab on the core pack 7 are welded together.

[0064] This single-cell battery achieves active safety protection at the individual cell level by integrating a battery top cover with fire-fighting capabilities. In the event of thermal runaway within the battery, the fire-fighting agent inside the top cover is rapidly released through the weak point 20, precisely targeting the fault area to effectively suppress the spread of fire and prevent a chain reaction. Compared to module-level fire suppression, which requires spraying extinguishing agents over a large area, this significantly reduces agent waste and improves fire-fighting efficiency.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery top cover with fire-fighting function, characterized in that, include: The cover plate (1) has a recessed bottom surface forming a cavity (11); The sealing plate (2) is fixedly installed on the bottom surface of the cover plate (1) and encloses the cavity (11) to form a receiving chamber filled with fire-fighting agent; The pole post (3) passes through the sealing plate (2) through the insulating element (5) and extends to the outside of the cover plate (1); An explosion-proof valve (4) is installed on the sealing plate (2) and connected to the external environment, and is used to release pressure when the internal pressure of the battery exceeds the threshold. The sealing plate (2) has at least one weak opening (20) that communicates with the receiving chamber. The breaking pressure of the weak opening (20) is less than the breaking pressure of the explosion-proof valve (4). When the internal pressure of the battery rises to the breaking pressure of the weak opening (20), the weak opening (20) ruptures and the fire extinguishing agent is released.

2. The battery top cover with fire-fighting function as described in claim 1, characterized in that: The sealing plate (2) is provided with an upwardly extending first cylindrical part (21) and second cylindrical part (22). The first cylindrical part (21) and the second cylindrical part (22) pass through the top surface of the cover plate (1) and are fixedly connected to the cover plate (1). The pole post (3) passes through the first cylindrical part (21) and is electrically isolated from the sealing plate (2) through the insulating part (5). The explosion-proof valve (4) is installed in the second cylindrical part (22).

3. The battery top cover with fire-fighting function as described in claim 2, characterized in that: The cover plate (1) has a first mounting hole (12) and a second mounting hole (13). The upper end of the first cylindrical part (21) is fixedly connected to the first mounting hole (12), and the upper end of the second cylindrical part (22) is fixedly connected to the second mounting hole (13).

4. The battery top cover with fire-fighting function as described in claim 2, characterized in that: The insulating component (5) includes a first insulating part (51) and a second insulating part (52). The first insulating part (51) covers the bottom surface of the sealing plate (2). The second insulating part (52) is wrapped between the outer periphery of the pole post (3) and the inner side of the first cylindrical part (21). The second insulating part (52) and the first insulating part (51) are integrally formed. The lower end of the pole post (3) extends to the bottom surface of the first insulating part (51). The first insulating part (51) is provided with a clearance hole (511) opposite to the weak opening (20) and the explosion-proof valve (4).

5. The battery top cover with fire-fighting function as described in claim 4, characterized in that: The bottom of the pole post (3) has a limiting part (31) that is partially embedded in the first insulating part (51). The limiting part (31) is used to connect with the pole tab. The pole post (3), the insulating part (5) and the sealing plate (2) are integrally formed by injection molding.

6. The battery top cover with fire-fighting function as described in claim 4, characterized in that: The second insulating part (52) has a first concave-convex interlocking structure (512) that cooperates with the contact surface of the pole post (3) and the first cylindrical part (21).

7. The battery top cover with fire-fighting function as described in claim 4, characterized in that: A plurality of mutually cooperating second concave-convex interlocking structures (513) are provided on the contact surface of the first insulating part (51) and the sealing plate (2).

8. The battery top cover with fire-fighting function as described in claim 1, characterized in that: The sealing plate (2) is also provided with an upwardly extending third cylindrical part (23), and the cover plate (1) is provided with a third mounting hole (14). The third cylindrical part (23) and the third mounting hole (14) are fixedly connected, and the connection between the third cylindrical part (23) and the sealing plate (2) has a liquid injection hole (231).

9. The battery top cover with fire-fighting function as described in claim 1, characterized in that: The top surface of the cover plate (1) is provided with a liquid inlet (15) that communicates with the receiving chamber, for adding fire-fighting agent into the receiving chamber. The liquid inlet (15) is fixedly provided with a sealing component (16).

10. A single-cell battery, comprising a casing (6), a core pack (7), and a battery top cover with fire-fighting function as described in any one of claims 1 to 9, characterized in that: The core pack (7) is disposed inside the housing (6), the battery top cover with fire protection function is disposed at the opening of the housing (6), the sealing plate (2) is fixedly connected to the housing (6), and the electrode post (3) and the electrode tab on the core pack (7) are welded together.

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