A fireproof device for a power battery and a method of using the same

Abstract

The application discloses a fireproof device of a power battery and a use method thereof, and relates to the technical field of power batteries, which comprises a box body, a cover plate detachably connected to the box body, a passive fire extinguishing assembly arranged on the inner side of the box body to deliver fire extinguishing agent when the battery catches fire, an active fireproof assembly arranged side by side with the passive fire extinguishing assembly to actively release fire-retardant gas to the battery, and a shuttle valve arranged at the output end of the passive fire extinguishing assembly and connected in communication with the active fireproof assembly. The application is provided with the passive fire extinguishing assembly, the active fireproof assembly, the shuttle valve and a controller. When there is no fire, the device can deliver fire-retardant gas into the power battery box to reduce the oxygen concentration and the probability of fire in the power battery box. When a fire occurs, the device can timely input fire extinguishing agent to extinguish the fire. In addition, a sealing structure is arranged at the heat dissipation hole to avoid affecting the electrical devices inside the box body when a fire occurs around the box body.

Description

TECHNICAL FIELD

[0001] The present application relates to a fireproof device for power battery and a use method thereof. BACKGROUND

[0002] The power battery box stores power batteries inside, and is mainly applied to electric vehicles (EV), hybrid electric vehicles (PHEV) and other electric devices.

[0003] The existing power battery box is usually provided with a passive fire extinguishing device, that is, when a fire occurs inside the power battery box, the fire extinguishing device timely delivers fire extinguishing agent to the inside of the battery box, so as to extinguish the fire, but after the fire occurs, the inside of the power battery box is still damaged, the maintenance cost is high, and the fire risk caused by thermal runaway of the lithium battery cannot be reduced when there is no fire, so a fireproof device for power battery and a use method thereof are proposed. SUMMARY

[0004] The present application aims to provide a fireproof device for power battery and a use method thereof to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a fireproof device for power battery, comprising:

[0006] A box body, wherein a cover plate is detachably connected to the box body;

[0007] A passive fire extinguishing assembly is arranged inside the box body to deliver fire extinguishing agent when the battery catches fire;

[0008] An active fireproof assembly is arranged side by side with the passive fire extinguishing assembly to actively release fire-retardant gas to the battery;

[0009] A shuttle valve is arranged at the output end of the passive fire extinguishing assembly, and the input end of the shuttle valve is connected in communication with the active fireproof assembly, and the output end of the shuttle valve is connected in communication with the fireproof access end of the outer wall of the box body through a pipeline;

[0010] A controller is arranged at the edge inside the box body, and the controller is electrically connected with the passive fire extinguishing assembly and the active fireproof assembly through a wire harness respectively.

[0011] Preferably, the active fireproofing assembly comprises a molecular sieve, a gas heating pipe, a pressure reducing valve, a filter control valve and a gas tank control valve, one end of the gas heating pipe is fixed to the upper end of the inner side of the box through a support plate, one end of the gas heating pipe is provided with a first interface connected with an external air filter, the other end of the gas heating pipe is connected with the molecular sieve, the first output end of the molecular sieve is communicated with an external gas tank, the second output end of the molecular sieve is sequentially connected with the pressure reducing valve and the gas tank control valve, the filter control valve is arranged at the lower end of the inner side of the box, and the two ends of the filter control valve are respectively communicated with an external air compressor and an air filter.

[0012] Preferably, the active fireproofing assembly further comprises an oxygen module and an exhaust valve, the oxygen module is fixed to one end of the inner side of the box, one side of the oxygen module is provided with an output pipe, one end of the output pipe is connected with the exhaust valve, and one end of the exhaust valve is communicated with an exhaust end provided on one side wall of the box.

[0013] Preferably, the first input end of the shuttle valve is provided with a second pipeline connected with the output pipe, and the second input end of the shuttle valve is provided with a first pipeline connected with the passive fire extinguishing assembly.

[0014] Preferably, the molecular sieve is tubular, and the molecular sieve is a carbon molecular sieve.

[0015] Preferably, the passive fire extinguishing assembly comprises a perfluorohexanone extinguishing agent, a support and a connecting hole, one end of the inner side of the perfluorohexanone extinguishing agent is provided with a gas generating assembly for pushing out the extinguishing agent, supports are arranged at both ends of the outer surface of the perfluorohexanone extinguishing agent, the lower end of the support is provided with a connecting hole in the inner side, a support is fixed to the bottom end of the inner side of the box, mounting screw holes corresponding to the connecting hole are arranged on the support, and a positioning plate matched with the support is fixed to the lower end of the support.

[0016] Preferably, a heat dissipation hole is arranged through the inner side of the cover plate, and a sealing structure for closing the heat dissipation hole when fire is lost is arranged on the lower surface of the cover plate.

[0017] Preferably, the sealing structure comprises a fixed block, a sliding block, a deformation piece, a guide rail, a sealing plate and a torsional spring, the guide rail is fixed to the lower surface of the cover plate, the sealing plate is slidably connected to the inner side of the guide rail, the sliding block matched with the cover plate is fixed to the sealing plate, the fixed block is fixed to the upper surface of the cover plate, the deformation piece affected by temperature is arranged between the fixed block and the sliding block, the torsional spring is arranged at one end of the sealing plate to push the sealing plate to move, and the other end of the torsional spring abuts against the protrusion on the lower surface of the cover plate.

[0018] Preferably, the material of the deformation piece is a memory alloy or a heat-sensitive glass ball.

[0019] A use method of the power battery fireproofing device, comprising the following method:

[0020] Step A: The external air compressor and air filter are connected to the filter control valve respectively, and the input end of the gas heating pipe is communicated with the air filter, then the filter control valve is opened, so that the compressed air flows into the inside of the gas heating pipe after being filtered, then the combustion-supporting gas is separated out by the molecular sieve and is led to the pressure reducing valve and the external gas storage tank;

[0021] Step B: The combustion-supporting gas passing through the pressure reducing valve flows into the oxygen module through the gas storage tank control valve, and flows into the shuttle valve after being detected qualified by the oxygen module, and the fireproof access end of the output end of the shuttle valve is externally connected to the power battery box, so as to provide the combustion-supporting gas to the power battery box, reduce the oxygen concentration of the power battery box, and reduce the fire of the power battery box;

[0022] Step C: When the amount of combustion-supporting gas detected at the shuttle valve is insufficient, the combustion-supporting gas in the gas storage tank flows into the pressure reducing valve, and then is delivered to the power battery box through the shuttle valve;

[0023] Step D: When the fire of the power battery box occurs, the controller makes the gas generating assembly in the perfluoroheptane ketone extinguishing agent inside work to generate gas, and the piston in the perfluoroheptane ketone extinguishing agent inside moves to push the extinguishing agent to flow into the inside of the first pipeline, the pressure in the inside of the first pipeline is higher than that in the second pipeline, and the extinguishing agent flows into the power battery box through the fireproof access end of the output end of the shuttle valve for extinguishing;

[0024] Step E: When the fire occurs around the box, the temperature of the fire will deform the deformation piece, at this time, the sealing plate is pushed by the elastic force of the torsion spring to move to the heat dissipation hole to close the heat dissipation hole.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] The present application is provided with a passive extinguishing assembly, an active fireproofing assembly, a shuttle valve and a controller, which can deliver the combustion-supporting gas to the power battery box to reduce the oxygen concentration and reduce the probability of fire of the power battery box without fire, and can input the extinguishing agent for extinguishing in time when the fire occurs, so as to improve the fireproofing effect of the power battery box, increase the practicability of the device, and avoid the influence on the electrical devices inside the box when the fire occurs around the box, which can quickly close the heat dissipation hole to improve the effect of isolating external flame and ensure good fireproofing. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic view of the present application;

[0028] Figure 2Structure diagram of active fire extinguishing assembly of the present application;

[0029] Figure 3 Structure diagram of molecular sieve of the present application;

[0030] Figure 4 Structure diagram of shuttle valve of the present application;

[0031] Figure 5 Structure diagram of passive fire extinguishing assembly of the present application;

[0032] Figure 6 Structure diagram of support of the present application;

[0033] Figure 7 Structure diagram of sealing of the present application;

[0034] Figure 8 Structure diagram of guide rail of the present application;

[0035] Figure 9 Structure diagram of torsion spring of the present application;

[0036] Figure 10 Structure diagram of use method of the present application.

[0037] In the figure: 1, box; 2, cover plate; 3, exhaust end; 5, fireproof access end; 6, passive fire extinguishing assembly; 601, perfluorohexanone extinguishing agent; 602, support; 603, connecting hole; 604, positioning plate; 7, active fire extinguishing assembly; 701, molecular sieve; 702, gas heating pipe; 703, pressure reducing valve; 704, filter control valve; 705, oxygen module; 706, exhaust valve; 707, gas tank control valve; 8, shuttle valve; 9, controller; 10, heat dissipation hole; 11, first pipeline; 12, second pipeline; 131, fixed block; 132, sliding block; 133, deformation piece; 134, guide rail; 135, sealing plate; 136, torsion spring. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] Please refer to Figures 1-10 The present application provides a technical solution: a fireproof device of a power battery, comprising:

[0040] The box 1 is detachably connected with the cover plate 2.

[0041] Passive fire extinguishing assembly 6 is arranged inside the box 1 to deliver fire extinguishing agent when the battery is on fire;

[0042] Conveniently, when the fire occurs inside the power battery box, the fire extinguishing agent is delivered in time to extinguish the fire;

[0043] Active fire prevention assembly 7 is arranged side by side with passive fire extinguishing assembly 6 to actively release fire suppression gas to the battery;

[0044] Conveniently, when there is no fire, fire suppression gas is delivered to the inside of the power battery box to reduce the oxygen content in the air inside the low-power battery box, thereby isolating the oxygen that facilitates combustion. The fire suppression gas is inert gas, preferably nitrogen;

[0045] Using nitrogen to replace air and fill the place where the lithium battery is located, so that the lithium battery is in an oxygen-free, low-humidity inert environment, reducing the conditions for lithium battery thermal runaway and even if the lithium battery has thermal runaway, it will not affect the adjacent battery, reducing the probability of battery combustion and explosion.

[0046] Shuttle valve 8 is arranged at the output end of passive fire extinguishing assembly 6, and the input end of shuttle valve 8 is connected with active fire prevention assembly 7, and the output end of shuttle valve 8 is connected with fire prevention access end 5 of the outer wall of box 1 through pipeline;

[0047] Conveniently, the fire extinguishing agent or fire suppression gas is delivered to the power battery box respectively. Shuttle valve 8 is a straight stroke valve, which is a valve body combined with an actuator. Its advantages are small size and easy installation;

[0048] Controller 9 is arranged at the edge inside the box 1, and the controller 9 is electrically connected with passive fire extinguishing assembly 6 and active fire prevention assembly 7 respectively through wire harness;

[0049] Conveniently, the delivery of fire suppression gas or the operation of passive fire extinguishing assembly 6 to deliver fire extinguishing agent is controlled.

[0050] Preferably, active fire prevention assembly 7 includes molecular sieve 701, gas heating pipe 702, pressure reducing valve 703, filter control valve 704 and gas tank control valve 707. The gas heating pipe 702 is fixed to the upper end inside the box 1 through the support plate, and one end of the gas heating pipe 702 is provided with a first interface connected with the external air filter. The other end of the gas heating pipe 702 is connected with the molecular sieve 701. The first output end of the molecular sieve 701 is connected with the external gas tank. The second output end of the molecular sieve 701 is connected with the pressure reducing valve 703 and the gas tank control valve 707 in sequence. The filter control valve 704 is arranged at the lower end inside the box 1, and the two ends of the filter control valve 704 are connected with the external air compressor and air filter respectively;

[0051] The air is used to prepare the combustion-supporting gas, which is nitrogen, and the nitrogen can be delivered to the inside of the power battery box to reduce the content of oxygen in the inside of the power battery box and reduce the fire.

[0052] Preferably, the active fireproof assembly 7 further comprises an oxygen module 705 and an exhaust valve 706, the oxygen module 705 is fixed to one end of the inside of the box body 1, and one side of the oxygen module 705 is provided with an output pipe, and one end of the output pipe is connected with the exhaust valve 706, and one end of the exhaust valve 706 is in communication with the exhaust end 3 provided on one side wall of the box body 1.

[0053] The oxygen module 705 is used to detect the oxygen concentration of the prepared nitrogen, so that the nitrogen with a suitable concentration can be delivered to the power battery box, the unqualified nitrogen can be discharged, and the nitrogen with a relatively high content can also be discharged.

[0054] Preferably, the first input end of the shuttle valve 8 is provided with a second pipeline 12 connected with the output pipe, and the second input end of the shuttle valve 8 is provided with a first pipeline 11 connected with the passive fire extinguishing assembly 6.

[0055] Preferably, the molecular sieve 701 is tubular, and the molecular sieve 701 is a carbon molecular sieve.

[0056] The molecular sieve separation technology PSA uses the preferential adsorption characteristics of the carbon molecular sieve to separate nitrogen, and the oxygen is adsorbed under high pressure, and the nitrogen directly passes through.

[0057] Preferably, the passive fire extinguishing assembly 6 comprises a perfluorohexanone extinguishing agent 601, a support 602 and a connecting hole 603, one end of the inside of the perfluorohexanone extinguishing agent 601 is provided with a gas generating assembly used to push the extinguishing agent to be sprayed out, both ends of the outer surface of the perfluorohexanone extinguishing agent 601 are provided with the support 602, and the connecting hole 603 is formed in the inside of the lower end of the support 602, a support is fixed to the bottom end of the inside of the box body 1, and a mounting screw hole corresponding to the connecting hole 603 is formed in the support, and the lower end of the support 602 is fixed with a positioning plate 604 matched with the support;

[0058] The high-pressure gas generated by triggering the gas generating assembly drives the piston, and the piston pushes the extinguishing agent out to extinguish the outside, and the support 602 is convenient for installation, and the expired or used perfluorohexanone extinguishing agent 601 can be conveniently replaced.

[0059] Preferably, the heat dissipation hole 10 is formed in the inside of the cover plate 2, and the lower surface of the cover plate 2 is provided with a sealing structure for closing the heat dissipation hole 10 when the fire is out, so as to avoid closing the heat dissipation hole 10 when the fire is out, to isolate the communication between the outside and the inside of the box body 1, and reduce the influence of the fire.

[0060] Preferably, the sealing structure comprises a fixed block 131, a sliding block 132, a deformation piece 133, a guide rail 134, a sealing plate 135 and a torsion spring 136, the guide rail 134 is fixed to the lower surface of the cover plate 2, the inner side of the guide rail 134 is slidingly connected with the sealing plate 135, the sliding block 132 slidingly matched with the cover plate 2 is fixed to the sealing plate 135, the fixed block 131 is fixed to the upper surface of the cover plate 2, the deformation piece 133 between the fixed block 131 and the sliding block 132 is deformed by temperature, one end of the sealing plate 135 is provided with the torsion spring 136 for pushing the sealing plate 136 to move, and the other end of the torsion spring 136 abuts against the protrusion on the lower surface of the cover plate 2.

[0061] When the fire occurs, the deformation piece 133 is deformed or broken by the high temperature of the fire, so that the torsion spring 136 pushes the sealing plate 135 to move along the guide rail 134, and the sealing plate 135 closes the heat dissipation hole 10.

[0062] Preferably, the material of the deformation piece 133 is memory alloy or heat-sensitive glass ball, which is deformed or broken by heat, so that the sliding block 132 is released from the limiting, and the sealing plate 135 moves.

[0063] A use method of the power battery fireproof device, comprising the following steps:

[0064] Step A: the external air compressor and the air filter are respectively connected to the two ends of the filter control valve 704, the input end of the gas heating pipe 702 is communicated with the air filter, then the filter control valve 704 is opened, so that the compressed air is filtered and then heated in the inner side of the gas heating pipe 702, then the fire-retardant gas is separated out through the molecular sieve 701 and flows to the pressure reducing valve 703 and the external gas storage tank;

[0065] Step B: the fire-retardant gas passing through the pressure reducing valve 703 flows into the oxygen module 705 through the gas storage tank control valve 707, and flows into the shuttle valve 8 after being detected by the oxygen module 705, and then flows out through the fireproof access end 5 of the output end of the shuttle valve 8 to the power battery box, so as to provide the fire-retardant gas to the power battery box, reduce the oxygen concentration in the power battery box, and reduce the fire in the power battery box;

[0066] Step C: when the amount of the fire-retardant gas detected by the shuttle valve 8 is insufficient, the fire-retardant gas in the gas storage tank flows into the pressure reducing valve 703, and then is delivered to the power battery box through the shuttle valve 8;

[0067] Step D: when the fire occurs in the power battery box, the controller 9 drives the gas generating assembly in the perfluoroalkyl ketone extinguishing agent 601 to work to generate gas, and drives the piston in the perfluoroalkyl ketone extinguishing agent 601 to move to push the extinguishing agent to flow into the first pipeline 11, the pressure in the first pipeline 11 is higher than that in the second pipeline 12, and the extinguishing agent flows into the power battery box through the fireproof access end 5 of the output end of the shuttle valve 8 to extinguish the fire;

[0068] Step E: when a fire occurs at the periphery of the box 1, the fire temperature will cause the deformation of the deformation piece 133, at this time the sealing plate 135 is pushed by the elastic force of the torsion spring 136 to move to the heat dissipation hole 10 to close the heat dissipation hole 10.

[0069] The fire-retardant gas of the present application is nitrogen, and the control strategy during fire prevention is divided into three parts: nitrogen preparation, battery box nitrogen filling and temperature reduction and fire extinguishing.

[0070] 1. Nitrogen preparation control:

[0071] When the nitrogen storage tank pressure P1<Pa, open the compressed air electromagnetic valve to prepare nitrogen until P1>Pb.

[0072] P1 is the gas pressure of the nitrogen storage tank, Pa is the storage tank pressure threshold when nitrogen preparation starts, and Pb is the storage tank pressure threshold when nitrogen preparation stops.

[0073] 2. Battery box nitrogen filling control:

[0074] When the battery box pressure P2<Pc, open the storage tank electromagnetic valve, detect the nitrogen oxygen concentration C and humidity H, if qualified, fill nitrogen to P2>Pd.

[0075] P2 is the gas pressure inside the battery box, Pc is the battery box pressure threshold when nitrogen filling starts, and Pd is the battery box pressure threshold when nitrogen filling stops.

[0076] 3. Temperature reduction and fire extinguishing control:

[0077] When the battery box temperature T>Tm or smoke is detected, inject fire extinguishing agent into the battery box to reduce the temperature.

[0078] T is the internal temperature of the battery box, and Tm is the preset internal temperature threshold of the battery box.

[0079] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fire prevention device for a power battery, characterized in that, include: Box (1), on which a cover plate (2) is detachably connected; A passive fire suppression assembly (6) is disposed inside the housing (1) to deliver fire extinguishing agent in the event of a battery fire; An active fire prevention component (7) is arranged side by side with the passive fire extinguishing component (6) to actively release flame-suppressing gas to the battery; A shuttle valve (8) is installed at the output end of the passive fire extinguishing component (6), and the input end of the shuttle valve (8) is connected to the active fire protection component (7). The output end of the shuttle valve (8) is connected to the fireproof access end (5) on the outer wall of the box (1) through a pipe. The controller (9) is located on the inner edge of the box (1), and the controller (9) is electrically connected to the passive fire extinguishing component (6) and the active fire prevention component (7) respectively through a wiring harness; The first input end of the shuttle valve (8) is provided with a second pipe (12) connected to the active fire prevention component (7), and the second input end of the shuttle valve (8) is provided with a first pipe (11) connected to the passive fire extinguishing component (6). When the pressure inside the first pipe (11) is higher than that inside the second pipe (12), the fire extinguishing agent flows into the power battery box through the fire prevention access end (5) of the output end of the shuttle valve (8) to extinguish the fire.

2. The fire prevention device for a power battery according to claim 1, characterized in that: The active fire protection component (7) includes a molecular sieve (701), a gas heating pipe (702), a pressure reducing valve (703), a filter control valve (704), and a gas storage tank control valve (707). The gas heating pipe (702) is fixed to the upper inner side of the box (1) by a support plate. One end of the gas heating pipe (702) is provided with a first interface for connecting to an external air filter. The other end of the gas heating pipe (702) is connected to the molecular sieve (701). The first output end of the molecular sieve (701) is connected to an external gas storage tank. The second output end of the molecular sieve (701) is connected to the pressure reducing valve (703) and the gas storage tank control valve (707) in sequence. The filter control valve (704) is located at the lower inner side of the box (1). Both ends of the filter control valve (704) are connected to an external air compressor and an air filter, respectively.

3. A fire prevention device for a power battery according to claim 2, characterized in that: The active fire protection component (7) also includes an oxygen module (705) and an exhaust valve (706). The oxygen module (705) is fixed to one end of the inner side of the box (1), and an output pipe is provided on one side of the oxygen module (705). An exhaust valve (706) is connected to one end of the output pipe, and one end of the exhaust valve (706) is connected to an exhaust end (3) provided on one side wall of the box (1).

4. A fire prevention device for a power battery according to claim 3, characterized in that: The first input end of the shuttle valve (8) is provided with a second pipe (12) connected to the output pipe, and the second input end of the shuttle valve (8) is provided with a first pipe (11) connected to the passive fire extinguishing assembly (6).

5. A fire prevention device for a power battery according to claim 2, characterized in that: The molecular sieve (701) is tubular, and the molecular sieve (701) is a carbon molecular sieve.

6. A fire prevention device for a power battery according to claim 1, characterized in that: The passive fire extinguishing assembly (6) includes a perfluorohexanone fire extinguishing agent (601), a support (602), and a connecting hole (603). A gas generating assembly for propelling the fire extinguishing agent is provided at one end of the inner side of the perfluorohexanone fire extinguishing agent (601). Supports (602) are provided at both ends of the outer surface of the perfluorohexanone fire extinguishing agent (601), and a connecting hole (603) is provided on the inner side of the lower end of the support (602). A bracket is fixed at the bottom of the inner side of the box (1), and a mounting screw hole corresponding to the connecting hole (603) is provided on the bracket. A positioning plate (604) that cooperates with the bracket is fixed on the lower side wall of the support (602).

7. A fire prevention device for a power battery according to claim 1, characterized in that: The cover plate (2) has a heat dissipation hole (10) through the inner side, and the lower surface of the cover plate (2) is provided with a sealing structure to close the heat dissipation hole (10) in case of fire.

8. A fire prevention device for a power battery according to claim 7, characterized in that: The sealing structure includes a fixed block (131), a slider (132), a deformable element (133), a guide rail (134), a sealing plate (135), and a torsion spring (136). The guide rail (134) is fixed to the lower surface of the cover plate (2), and the sealing plate (135) is slidably connected to the inner side of the guide rail (134). The slider (132) that slides with the cover plate (2) is fixed on the sealing plate (135). The fixed block (131) is fixed to the upper surface of the cover plate (2), and there is a deformable element (133) between the fixed block (131) and the slider (132) that deforms due to temperature. One end of the sealing plate (135) is provided with a torsion spring (136) that pushes it to move, and the other end of the torsion spring (136) abuts against a protrusion on the lower surface of the cover plate (2).

9. A fire prevention device for a power battery according to claim 8, characterized in that: The deformable component (133) is made of shape memory alloy or a thermistor glass ball.

10. A method of using a fire prevention device for a power battery, characterized in that, Includes the fire protection device according to any one of claims 1-9 and the following methods: Step A: The external air compressor and air filter are connected to both ends of the filter control valve (704), and the input end of the gas heating pipe (702) is connected to the air filter. Then the filter control valve (704) is opened so that the compressed air is filtered and flows into the inside of the gas heating pipe (702) for heating. Then the flame-suppressing gas is separated by the molecular sieve (701) and passed to the pressure reducing valve (703) and the external air storage tank. Step B: The flame-suppressing gas from the pressure reducing valve (703) flows into the oxygen module (705) through the gas storage tank control valve (707). After passing the oxygen module (705) test, it flows into the shuttle valve (8) and is connected to the power battery box through the fireproof access terminal (5) at the output end of the shuttle valve (8) to provide flame-suppressing gas into the battery box, reduce the oxygen concentration in the power battery box, and reduce the risk of fire in the power battery box. Step C: When insufficient gas supply is detected at the shuttle valve (8), the gas supply in the gas storage tank flows into the pressure reducing valve (703) and then is delivered to the power battery box through the shuttle valve (8); Step D: When a fire occurs in the power battery box, the controller (9) causes the gas generating component inside the perfluorohexanone extinguishing agent (601) to work and generate gas, which pushes the piston inside the perfluorohexanone extinguishing agent (601) to move so as to push the extinguishing agent out and flow into the inside of the first pipe (11). The pressure inside the first pipe (11) is higher than that in the second pipe (12). The extinguishing agent flows into the power battery box through the fireproof access end (5) of the output end of the shuttle valve (8) to extinguish the fire. Step E: When a fire occurs unexpectedly around the box (1), the fire temperature will cause the deformable part (133) to deform. At this time, the sealing plate (135) is pushed by the elastic force of the torsion spring (136) to move to the heat dissipation hole (10) and seal the heat dissipation hole (10).

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