Battery pack thermal management system and thermal management method thereof

Abstract

The invention belongs to the technical field of battery pack heat management, and particularly relates to a battery pack heat management system and a heat management method thereof.The battery pack heat management system comprises a shell, large partition plates are installed in the shell and divide the inner space of the shell into a plurality of unit cavities, and small partition plates are installed in the unit cavities; each unit cavity is divided into a battery cavity at the bottom and a gas storage cavity at the top by the corresponding small partition plate, and a lithium battery pack is mounted in each battery cavity. The perfluorohexanone is sprayed to the battery cavity through the spray head, the perfluorohexanone can be quickly gasified after being released, the temperature of the lithium battery pack is reduced to a safe range, and the situation that the electrolyte is continuously decomposed to generate gas and release oxygen is avoided; the gasified perfluorohexanone is deposited at the bottom of the battery cavity, and gas and oxygen decomposed from the electrolyte in the battery cavity are discharged out of the battery cavity, so that the oxygen in the battery cavity is prevented from causing re-combustion of the lithium battery pack; the inclined pressing block drives the spraying head to rotate towards the lithium battery pack, and the spraying head is aligned with an ignition point on the lithium battery pack to extinguish fire.

Description

Technical Field

[0001] This invention belongs to the field of battery pack thermal management technology, specifically relating to a battery pack thermal management system and its thermal management method. Background Technology

[0002] A battery pack is a complete power supply system that combines multiple individual battery cells (such as battery cells) in series, parallel, or mixed configurations, integrating structural support, management systems, and protection devices. Battery packs are primarily used for the safety protection of high-energy-density battery packs in energy storage power stations, significantly improving the thermal safety performance of battery systems. Battery pack thermal management is a key technology for ensuring battery safety, performance, and lifespan, especially crucial in fields such as new energy vehicles and energy storage systems.

[0003] Battery pack thermal runaway refers to the process in which the temperature inside the battery rises sharply due to abnormal reactions, triggering a chain reaction of exothermic effects. Most existing technologies extinguish the fire by spraying perfluorohexanone, such as the patent with publication number CN215608977U.

[0004] Since the combustion of lithium batteries is essentially a self-heating cycle (thermal runaway) caused by an internal short circuit, when the temperature exceeds the critical point (about 150°C), the electrolyte decomposes to produce gas and release oxygen, creating conditions for continuous combustion. Although perfluorohexanone can extinguish the battery fire, the presence of oxygen can easily cause the battery pack to reignite. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a battery pack thermal management system and its thermal management method, thereby solving the technical problems in the prior art.

[0006] The objective of this invention can be achieved through the following technical solution: A battery pack thermal management system includes a housing, a large partition plate installed inside the housing, which divides the internal space of the housing into several unit cavities, a small partition plate installed inside each unit cavity, which divides the unit cavity into a bottom battery cavity and a top gas storage cavity, a lithium battery pack installed in the battery cavity, an exhaust assembly installed in the gas storage cavity, a side platform installed on the side wall of the housing, a power assembly installed inside the side platform, and the power assembly driving the exhaust assembly to move; a perfluorohexanone spray assembly is installed on the small partition plate, the perfluorohexanone spray assembly includes a spray head rotatably mounted on the small partition plate, the spray head facing the battery cavity, the spray head being connected to a vertical rod via a crossbar, and a slanted pressure block installed at the top of the vertical rod, as the power assembly drives the exhaust assembly to move, the exhaust assembly presses the slanted pressure block, and the slanted pressure block drives the spray head to rotate towards the lithium battery pack via the vertical rod and the crossbar; a CO gas detection module is installed inside the lithium battery pack, and when the CO gas detection module detects CO released in the early stage of thermal runaway of the lithium battery pack, it triggers the spray head.

[0007] As a further optimization or improvement of this solution, a strip-shaped groove is opened inside the small partition plate, and a sliding plate is installed on the vertical rod. The sliding plate slides inside the strip-shaped groove, and the sliding plate is connected to the inner wall of the strip-shaped groove by a spring.

[0008] As a further optimization or improvement of this solution, several mounting cavities are opened in the side platform, the number of which corresponds to the unit cavity. The power assembly includes a transmission box installed inside the mounting cavity, and push rod one and push rod two are respectively installed at the output end of the transmission box. The exhaust assembly includes a top plate and a bottom plate, push rod two is connected to the bottom plate, and push rod one passes through the bottom plate and connects to the top plate.

[0009] As a further optimization or improvement of this solution, a longitudinal sliding groove is provided on the side wall of the outer shell, and the top plate and the bottom plate slide inside the longitudinal sliding groove respectively. A pad is installed on the top plate, and an exhaust port is installed on the pad. The top plate is connected to the bottom plate through a sealing cover.

[0010] As a further optimization or improvement to this solution, the base plate is connected to the inner wall of the longitudinal groove through a rubber seal.

[0011] As a further optimization or improvement of this solution, a bottom groove is opened at the bottom of the base plate, and a horizontal plate is slidably installed inside the bottom groove. The horizontal plate is connected to the inner wall of the bottom groove by a spring. An inclined surface is opened on the horizontal plate, and the horizontal plate cooperates with the inclined pressure block through the inclined surface.

[0012] A battery pack thermal management method, applied to a battery pack thermal management system as described above, the method comprising the following steps: Step S1: The present invention identifies the thermal runaway of the lithium battery pack through the CO gas detection module and triggers the spray head to spray perfluorohexanone into the battery cavity through the spray head; Step S2: Perfluorohexanone will rapidly vaporize after release. The vaporization of perfluorohexanone is endothermic, which reduces the temperature of the lithium battery pack to a safe range, terminates the chain reaction, and prevents the electrolyte from continuing to decompose and generate gas and release oxygen. Step S3: The vaporized perfluorohexanone is deposited at the bottom of the battery chamber, and the gas and oxygen from the decomposition of the electrolyte in the battery chamber are discharged. Step S4: The transmission box moves the base plate down via push rod two. As the base plate moves down, it presses down on the inclined pressure block. The inclined pressure block drives the spray head to rotate toward the lithium battery pack via the longitudinal and transverse rods, aiming the spray head at the ignition point on the lithium battery pack and extinguishing the fire.

[0013] The beneficial effects of this invention are: (1) In this invention, perfluorohexanone is sprayed into the battery cavity through a spray nozzle. After being released, perfluorohexanone will quickly vaporize. The vaporization of perfluorohexanone is heat-absorbing, which reduces the temperature of the lithium battery pack to a safe range and prevents the electrolyte from continuously decomposing and generating gas and releasing oxygen. Based on the high density of perfluorohexanone gas, the vaporized perfluorohexanone is deposited at the bottom of the battery cavity, which discharges the gas and oxygen from the decomposition of the electrolyte in the battery cavity and prevents the oxygen in the battery cavity from causing the lithium battery pack to reignite. This invention uses a power component to drive the exhaust component to move. The exhaust component presses down on the inclined pressure block, and the inclined pressure block drives the spray head to rotate toward the lithium battery pack via the longitudinal and transverse rods, so that the spray head is aimed at the ignition point on the lithium battery pack and extinguishes the fire.

[0014] (2) The present invention causes the combustible gas and combustion particles emitted by the lithium battery pack to enter the cavity between the top plate and the bottom plate by moving the bottom plate downward; as the bottom plate continues to move downward, the horizontal plate blocks the bottom plate, and after standing for a period of time, the combustion particles in the gas cool down and deposit on the bottom plate, avoiding the combustion particles from being emitted with the gas and causing the sealing cover to be blocked; as the temperature of the combustion particles decreases, it avoids the combustion particles from igniting the filter material in the filter. Furthermore, after the gas has been left to stand for a period of time, it cools down and the gas pressure decreases, making it difficult to actively discharge from the cavity between the top plate and the bottom plate. Therefore, this invention uses a transmission box and a push rod to move the top plate downwards, while the exhaust port opens. As the top plate moves downwards, it compresses the combustible gas in the cavity between the top plate and the bottom plate and discharges it through the exhaust port, thus preventing combustion particles from clogging the exhaust port. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the lithium battery pack installation structure.

[0019] Figure 4 This is a schematic diagram of the connection structure between the power assembly and the exhaust assembly.

[0020] Figure 5 for Figure 4 Enlarged view of the structure of part A.

[0021] Figure 6 This is a schematic diagram showing the installation location of the perfluorohexanone spray assembly.

[0022] Figure 7 This is an exploded view of the perfluorohexanone spray assembly.

[0023] The diagram shows: 1. Outer shell; 2. Side platform; 3. Lithium battery pack; 4. Large partition plate; 5. Housing cavity; 6. Power assembly; 601. Transmission box; 602. Push rod one; 603. Push rod two; 7. Exhaust assembly; 701. Top plate; 702. Bottom plate; 703. Pad block; 704. Exhaust port; 705. Sealing cover; 706. Bottom groove; 707. Spring two; 708. Horizontal plate; 709. Rubber seal; 8. Unit cavity; 801. Battery cavity; 802. Gas storage cavity; 9. Perfluorohexanone spray assembly; 901. Spray head; 902. Horizontal bar; 903. Vertical bar; 904. Inclined pressure block; 905. Slide plate; 906. Strip groove; 907. Spring one; 10. Longitudinal groove; 11. Small partition plate. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] See Figures 1-7 A battery pack thermal management system includes a housing 1, with a large partition 4 installed inside the housing 1, dividing the internal space of the housing 1 into several unit cavities 8. Small partitions 11 are installed within each unit cavity 8, dividing it into a bottom battery cavity 801 and a top gas storage cavity 802. A lithium battery pack 3 is installed in the battery cavity 801, and an exhaust assembly 7 is installed in the gas storage cavity 802. A side platform 2 is installed on the side wall of the housing 1, and a power assembly 6 is installed inside the side platform 2, driving the exhaust assembly 7 to move. A perfluorohexanone spray assembly 9 is installed on the small partitions 11 for perfluorohexanone spraying. Component 9 includes a spray head 901 rotatably mounted on a small partition plate 11, with the spray head 901 facing the battery cavity 801. The spray head 901 is connected to a longitudinal rod 903 via a crossbar 902. A slanted pressure block 904 is mounted on the top of the longitudinal rod 903. As the power component 6 drives the exhaust component 7 to move, the exhaust component 7 presses the slanted pressure block 904. The slanted pressure block 904 drives the spray head 901 to rotate toward the lithium battery pack 3 via the longitudinal rod 903 and the crossbar 902. A CO gas detection module is installed inside the lithium battery pack 3. When the CO gas detection module detects CO released in the early stage of thermal runaway of the lithium battery pack 3, it triggers the spray head 901.

[0026] Specifically, a strip groove 906 is provided inside the small partition plate 11, and a slide plate 905 is installed on the vertical rod 903. The slide plate 905 slides inside the strip groove 906, and the slide plate 905 is connected to the inner wall of the strip groove 906 by a spring 907.

[0027] It should be noted that when the lithium battery pack 3 experiences thermal runaway, the temperature rises sharply. When the temperature exceeds the critical point (approximately 150°C), the electrolyte decomposes to produce gas and release oxygen.

[0028] This invention identifies thermal runaway of lithium battery pack 3 through a CO gas detection module, which triggers spray head 901. Perfluorohexanone is sprayed into battery cavity 801 through spray head 901. According to the physical characteristics of perfluorohexanone, it will rapidly vaporize after release. The vaporization of perfluorohexanone is endothermic, which reduces the temperature of lithium battery pack 3 to a safe range (e.g., <60°C), terminates the chain reaction, and prevents the electrolyte from continuously decomposing to generate gas and release oxygen. Based on the high density of perfluorohexanone gas, the vaporized perfluorohexanone is deposited at the bottom of the battery cavity 801, which discharges the gas and oxygen from the decomposition of the electrolyte in the battery cavity 801, thus preventing the oxygen in the battery cavity 801 from causing the lithium battery pack 3 to reignite. At the same time, the transmission box 601 drives the base plate 702 to move down through the push rod 603. As the base plate 702 moves down, it presses down on the inclined pressure block 904. The inclined pressure block 904 drives the spray head 901 to rotate toward the lithium battery pack 3 through the longitudinal rod 903 and the transverse rod 902, so that the spray head 901 is aimed at the fire point on the lithium battery pack 3 and extinguishes the fire.

[0029] See Figures 4-7 The side platform 2 has several mounting cavities 5, the number of which corresponds to the unit cavity 8. The power assembly 6 includes a transmission box 601 installed inside the mounting cavity 5. Push rod 1 602 and push rod 2 603 are respectively installed at the output end of the transmission box 601. The exhaust assembly 7 includes a top plate 701 and a bottom plate 702. Push rod 2 603 is connected to the bottom plate 702, and push rod 1 602 passes through the bottom plate 702 and connects to the top plate 701.

[0030] Specifically, the outer casing 1 has a longitudinal sliding groove 10 on its side wall, and the top plate 701 and the bottom plate 702 slide inside the longitudinal sliding groove 10 respectively. A pad 703 is installed on the top plate 701, and an exhaust port 704 is installed on the pad 703. The top plate 701 is connected to the bottom plate 702 through a sealing cover 705.

[0031] Specifically, the base plate 702 is connected to the inner wall of the longitudinal groove 10 through a rubber seal 709.

[0032] Specifically, a bottom groove 706 is formed at the bottom of the bottom plate 702, and a horizontal plate 708 is slidably installed inside the bottom groove 706. The horizontal plate 708 is connected to the inner wall of the bottom groove 706 by a spring 707. An inclined surface is formed on the horizontal plate 708, and the horizontal plate 708 cooperates with the inclined pressure block 904 through the inclined surface.

[0033] It should be noted that when the lithium battery pack 3 experiences thermal runaway, the combustible gas and burning particles generated by the battery need to be discharged through the pressure relief valve. Since the discharged gas contains burning particles, it is easy to cause blockage of the pressure relief valve. Therefore, a filter is generally required to be installed on the pressure relief valve. However, because the temperature of the burning particles is high, they can easily ignite the filter material in the filter, causing damage to the filter.

[0034] In this invention, the transmission box 601 drives the bottom plate 702 to move downward through the push rod 603. As the bottom plate 702 moves downward, the cavity space between the top plate 701 and the bottom plate 702 increases. The combustible gas to be discharged, carrying the combustion particles, enters the cavity between the top plate 701 and the bottom plate 702 through the through holes on the horizontal plate 708 and the bottom plate 702.

[0035] As the base plate 702 continues to move downward, the base plate 702 presses the inclined pressure block 904 through the horizontal plate 708. Through the cooperation between the inclined pressure block 904 and the inclined surface on the horizontal plate 708, the inclined pressure block 904 pushes the horizontal plate 708 to slide along the bottom groove 706, so that the through hole on the horizontal plate 708 is misaligned with the through hole on the base plate 702, thereby sealing the base plate 702. After standing for a period of time, the combustion particles in the gas cool down and deposit on the base plate 702, reducing the temperature of the combustion particles and preventing the combustion particles from igniting the filter material in the filter. It should be noted that after the gas is left to stand for a period of time and then cools down, the gas pressure decreases and it becomes difficult to actively expel the cavity between the top plate 701 and the bottom plate 702. Therefore, the present invention uses the transmission box 601 and the push rod 602 to drive the top plate 701 to move downward, and at the same time the exhaust port 704 opens. As the top plate 701 moves downward, the top plate 701 compresses the combustible gas in the cavity between the top plate 701 and the bottom plate 702 and discharges it through the exhaust port 704, thus preventing combustion particles from clogging the exhaust port 704.

[0036] It should be noted that a filter is installed on the exhaust port 704 to prevent residual combustion particles from clogging the exhaust port 704.

[0037] See Figures 1-5 As shown, the present invention is a battery pack thermal management method, which is applied to the battery pack thermal management system described in the above embodiments. The method includes the following steps: Step S1: The present invention identifies thermal runaway of lithium battery pack 3 through CO gas detection module and triggers spray head 901 to spray perfluorohexanone into battery cavity 801 through spray head 901. Step S2: Perfluorohexanone will rapidly vaporize after release. The vaporization of perfluorohexanone is endothermic, which reduces the temperature of lithium battery pack 3 to a safe range, terminates the chain reaction, and prevents the electrolyte from continuing to decompose and generate gas and release oxygen. Step S3: The vaporized perfluorohexanone is deposited at the bottom of the battery cavity 801, and the gas and oxygen decomposed from the electrolyte in the battery cavity 801 are discharged from the battery cavity 801. Step S4: The transmission box 601 drives the base plate 702 to move down through the push rod 603. As the base plate 702 moves down, it presses down on the inclined pressure block 904. The inclined pressure block 904 drives the spray head 901 to rotate toward the lithium battery pack 3 through the vertical rod 903 and the horizontal rod 902, so that the spray head 901 is aimed at the fire point on the lithium battery pack 3 and extinguishes the fire.

[0038] The implementation principle of this invention is as follows: When the lithium battery pack experiences thermal runaway, the temperature rises sharply. When the temperature exceeds the critical point (approximately 150°C), the electrolyte decomposes to produce gas and release oxygen.

[0039] This invention identifies thermal runaway of lithium battery pack 3 through a CO gas detection module, which triggers spray head 901. Perfluorohexanone is sprayed into battery cavity 801 through spray head 901. According to the physical characteristics of perfluorohexanone, it will rapidly vaporize after release. The vaporization of perfluorohexanone is endothermic, which reduces the temperature of lithium battery pack 3 to a safe range (e.g., <60°C), terminates the chain reaction, and prevents the electrolyte from continuously decomposing to generate gas and release oxygen. Based on the high density of perfluorohexanone gas, the vaporized perfluorohexanone is deposited at the bottom of the battery cavity 801, which discharges the gas and oxygen from the decomposition of the electrolyte in the battery cavity 801, thus preventing the oxygen in the battery cavity 801 from causing the lithium battery pack 3 to reignite. At the same time, the transmission box 601 drives the base plate 702 to move down through the push rod 603. As the base plate 702 moves down, it presses down on the inclined pressure block 904. The inclined pressure block 904 drives the spray head 901 to rotate toward the lithium battery pack 3 through the longitudinal rod 903 and the transverse rod 902, so that the spray head 901 is aimed at the fire point on the lithium battery pack 3 and extinguishes the fire.

[0040] It should be noted that when the lithium battery pack 3 experiences thermal runaway, the combustible gas and burning particles generated by the battery need to be discharged through the pressure relief valve. Since the discharged gas contains burning particles, it is easy to cause blockage of the pressure relief valve. Therefore, a filter is generally required to be installed on the pressure relief valve. However, because the temperature of the burning particles is high, they can easily ignite the filter material in the filter, causing damage to the filter.

[0041] In this invention, the transmission box 601 drives the bottom plate 702 to move downward through the push rod 603. As the bottom plate 702 moves downward, the cavity space between the top plate 701 and the bottom plate 702 increases, allowing the combustible gas emitted by the lithium battery pack 3 to carry the combustion particles through the through holes on the horizontal plate 708 and the bottom plate 702 into the cavity between the top plate 701 and the bottom plate 702. As the base plate 702 continues to move downward, the base plate 702 presses the inclined pressure block 904 through the horizontal plate 708. Through the cooperation between the inclined pressure block 904 and the inclined surface on the horizontal plate 708, the inclined pressure block 904 pushes the horizontal plate 708 to slide along the bottom groove 706, so that the through hole on the horizontal plate 708 is misaligned with the through hole on the base plate 702, thereby sealing the base plate 702. After standing for a period of time, the combustion particles in the gas cool down and deposit on the base plate 702, reducing the temperature of the combustion particles and preventing the combustion particles from igniting the filter material in the filter. The top plate 701 is moved downward by the transmission box 601 and the push rod 602. At the same time, the exhaust port 704 is opened. As the top plate 701 moves downward, the top plate 701 compresses the combustible gas in the cavity between the top plate 701 and the bottom plate 702 and discharges it through the exhaust port 704 to prevent the combustion particles from clogging the exhaust port 704.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A battery pack thermal management system, characterized by: The application relates to a lithium battery safety device, which comprises an outer shell (1), a large partition plate (4) is arranged in the outer shell (1), the large partition plate (4) divides the space in the outer shell (1) into a plurality of unit cavities (8), a small partition plate (11) is arranged in the unit cavity (8), the small partition plate (11) divides the unit cavity (8) into a battery cavity (801) at the bottom and a gas storage cavity (802) at the top, a lithium battery group (3) is arranged in the battery cavity (801), an exhaust assembly (7) is arranged in the gas storage cavity (802), a side edge table (2) is arranged on the side wall of the outer shell (1), a power assembly (6) is arranged in the side edge table (2), and the power assembly (6) drives the exhaust assembly (7) to move. A perfluorohexanone spraying assembly (9) is arranged on the small partition plate (11), the perfluorohexanone spraying assembly (9) comprises a spraying head (901) rotatably arranged on the small partition plate (11), the spraying head (901) faces the battery cavity (801), the spraying head (901) is connected with a vertical rod (903) through a horizontal rod (902), an inclined pressing block (904) is arranged at the top of the vertical rod (903), when the power assembly (6) drives the exhaust assembly (7) to move, the exhaust assembly (7) presses the inclined pressing block (904), the inclined pressing block (904) drives the spraying head (901) to rotate towards the lithium battery group (3) through the vertical rod (903) and the horizontal rod (902). A CO gas detection module is arranged in the lithium battery group (3), when the CO gas detection module identifies the CO released in the initial thermal runaway of the lithium battery group (3), the spraying head (901) is triggered.

2. The battery pack thermal management system of claim 1, wherein: A strip-shaped sliding groove (906) is formed in the small partition plate (11), a sliding plate (905) is arranged on the vertical rod (903) and slides in the strip-shaped sliding groove (906), and the sliding plate (905) is connected with the inner wall of the strip-shaped sliding groove (906) through a spring (907).

3. The battery pack thermal management system of claim 1, wherein: A plurality of arrangement cavities (5) are formed in the side edge table (2), the number of the arrangement cavities (5) corresponds to the number of the unit cavities (8), the power assembly (6) comprises a transmission box (601) arranged in the arrangement cavity (5), and a push rod (602) and a push rod (603) are respectively arranged at the output end of the transmission box (601); the exhaust assembly (7) comprises a top plate (701) and a bottom plate (702), the push rod (603) is connected with the bottom plate (702), and the push rod (602) passes through the bottom plate (702) and is connected with the top plate (701).

4. The battery pack thermal management system of claim 1, wherein: A longitudinal sliding groove (10) is formed in the side wall of the outer shell (1), the top plate (701) and the bottom plate (702) slide in the longitudinal sliding groove (10) respectively, a pad (703) is arranged on the top plate (701), an exhaust port (704) is arranged on the pad (703), and the top plate (701) is connected with the bottom plate (702) through a sealing cover (705).

5. The battery pack thermal management system of claim 4, wherein: The bottom plate (702) is connected with the inner side wall of the longitudinal sliding groove (10) through a rubber sealing element (709).

6. The battery pack thermal management system of claim 5, wherein: The bottom plate (702) is provided with a bottom groove (706) at the bottom, the horizontal plate (708) is slidably arranged in the bottom groove (706), the horizontal plate (708) is connected to the inner wall of the bottom groove (706) through the spring two (707), the horizontal plate (708) is provided with an inclined surface, and the horizontal plate (708) is matched with the inclined pressing block (904) through the inclined surface.

7. A battery pack thermal management method, characterized by, The method is applied to the battery pack thermal management system as claimed in any one of claims 1-6, and the method comprises the following steps: Step S1: The CO gas detection module of the present application identifies the thermal runaway of the lithium battery pack (3) and triggers the spray head (901), and the spray head (901) sprays perfluorohexanone to the battery cavity (801); Step S2: After the release, the perfluorohexanone is rapidly vaporized, the perfluorohexanone vaporization absorbs heat, the temperature of the lithium battery pack (3) is reduced to a safe range, the chain reaction is terminated, and the decomposition of the electrolyte to generate gas and release oxygen is avoided; Step S3: The vaporized perfluorohexanone is deposited at the bottom of the battery cavity (801), and the gas and oxygen generated by the decomposition of the electrolyte in the battery cavity (801) are discharged; Step S4: The transmission box (601) drives the bottom plate (702) to move downward through the push rod two (603), as the bottom plate (702) moves downward, the bottom plate (702) presses the inclined pressing block (904), the inclined pressing block (904) drives the spray head (901) to rotate towards the lithium battery pack (3) through the vertical rod (903) and the horizontal rod (902), and the spray head (901) is aimed at the ignition point on the lithium battery pack (3) and extinguishes the fire.

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