A pressureless fire extinguisher boosting device and method for a battery box

Abstract

A pressureless fire extinguisher booster device and method for a battery box, wherein a piston assembly is provided between a fire extinguishing agent storage chamber and a first chemical reaction chamber, the piston assembly includes a driving part, one end of the driving part is provided with a bursting disc separating the first chemical reaction chamber; an isolation assembly is provided between the first chemical reaction chamber and the second chemical reaction chamber, the interior of the first chemical reaction chamber is filled with a solid agent, the interior of the second chemical reaction chamber is filled with a liquid agent, and the flip partition is used to separate the liquid agent from the solid agent. In the normal state, the first chemical reaction chamber and the second chemical reaction chamber are isolated by the isolation assembly, and in the fire extinguishing state, the first chemical reaction chamber and the second chemical reaction chamber are connected, and the solid agent and the liquid agent undergo an exothermic chemical reaction after the connection; high-pressure water vapor is generated to break through the bursting disc, and the fire extinguishing agent is sprayed to extinguish the fire by driving the piston assembly. The present invention adopts pre-pressureless storage, has no risk of pressure leakage, and has a high safety and stability coefficient.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery box fire extinguishing, and in particular relates to a pressureless fire extinguisher boosting device and method for a battery box. Background Art

[0002] With the rapid development of the electric vehicle industry, electrochemical energy storage technology has received extensive attention. Among them, lithium-ion batteries have become one of the most competitive electrochemical energy storage technologies in portable devices, electric vehicles and large-scale energy storage due to their high energy density and other characteristics. However, due to the use of flammable organic solvents as the main component of the electrolyte and the inherent exothermic characteristics of lithium-ion batteries, lithium dendrites will be generated in the case of overcharging or fast charging, resulting in safety accidents such as thermal runaway.

[0003] At present, in order to deal with the occurrence of battery thermal runaway, the existing technical solutions are usually matched with thermal runaway warning and fire extinguishing. The traditional fire extinguishing solution usually uses pressure tank storage to boost. The high-pressure tank occupies a large space and has a high storage pressure. There are huge safety hazards during transportation and installation, and it is not conducive to long-term storage. It is easy to cause pressure leakage. When in use, the pressure is insufficient and the fire extinguishing fails. The use temperature of some non-pressure storage fire extinguishers (such as foam fire extinguishers) needs to be above 5°C, which cannot meet the requirements of vehicle regulations; some non-pressure storage fire extinguishers use gunpowder explosion to obtain pressurized gas to boost. Gunpowder itself is flammable and explosive, and there are huge safety hazards; igniting gunpowder to instantly generate high-pressure gas often causes excessive pressure. If the pressure is not released in time, there will also be certain dangers; and the airflow is unstable, which affects the use effect of the fire extinguishing device. In addition, traditional fire extinguishing devices mostly use fire extinguishing agents such as carbon dioxide and heptafluoropropane. Such gas fire extinguishing agents have low fire extinguishing efficiency for batteries and poor cooling effect. Summary of the invention

[0004] To this end, the present invention provides a pressure-free fire extinguisher booster device and method for a battery box, which has no risk of pressure leakage, good safety and stability, and strong environmental adaptability.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a pressureless fire extinguisher booster device for a battery box, comprising a shell, wherein the interior of the shell is divided into a fire extinguishing agent storage chamber, a first chemical reaction chamber, and a second chemical reaction chamber; a piston assembly is provided between the fire extinguishing agent storage chamber and the first chemical reaction chamber, and a bursting disc is provided at one end of the piston assembly to separate the first chemical reaction chamber; an isolation assembly including a flip partition is provided between the first chemical reaction chamber and the second chemical reaction chamber, the interior of the first chemical reaction chamber is filled with a solid agent, and the interior of the second chemical reaction chamber is filled with a liquid agent;

[0006] The flipping partition separates the liquid medicament and the solid medicament, and the flipping partition changes the isolation state by flipping to mix the liquid medicament and the solid medicament.

[0007] As a preferred solution of the non-pressurized fire extinguisher boosting device for a battery box, the isolation component further includes a driving motor, the driving motor is fixed on the outer side of the housing, and the driving shaft of the driving motor is connected to the flipping partition; a sealing ring is wrapped around the edge of the flipping partition.

[0008] As a preferred solution of the non-pressurized fire extinguisher boosting device for a battery box, the piston assembly includes a driving part, and a bursting disc spaced from the first chemical reaction chamber is provided at one end of the driving part;

[0009] The piston assembly further includes a driving piston, the driving piston is connected to the driving part, and the edge of the driving piston contacts the inner wall of the housing.

[0010] Furthermore, the inside of the driving part is hollow, and the opening at the end of the driving part is shielded by the bursting disc.

[0011] As a preferred solution of the non-pressurized fire extinguisher boosting device for a battery box, the fire extinguishing agent storage chamber is filled with perfluoromethylcyclohexanone fire extinguishing agent or a fire extinguishing agent containing fluorinated ketone substances; the liquid medicament is a mixed solution of anhydrous ethanol and pure water; the solid medicament is anhydrous aluminum chloride.

[0012] As a preferred solution of the non-pressurized fire extinguisher boosting device for a battery box, a pressure relief port is opened on the housing outside the fire extinguishing agent storage chamber, the pressure relief port is connected to a pressure relief valve, and the pressure relief valve is electrically connected to a start switch; a fire extinguishing agent nozzle is provided at the end of the fire extinguishing agent storage chamber.

[0013] The present invention also provides a non-pressurized fire extinguisher boosting method for a battery box, which adopts the above-mentioned non-pressurized fire extinguisher boosting device for a battery box. In the daily state: the first chemical reaction chamber and the second chemical reaction chamber are isolated by the isolation component. The first chemical reaction chamber is filled with a solid medicament, the second chemical reaction chamber is filled with a liquid medicament, and the flipping partition of the isolation component separates the liquid medicament and the solid medicament;

[0014] In the fire extinguishing state: change the isolation state of the isolation component, and the flipping partition of the isolation component makes the first chemical reaction chamber and the second chemical reaction chamber communicate by flipping. After the communication, the solid medicament in the first chemical reaction chamber is mixed with the liquid medicament in the second chemical reaction chamber and undergoes an exothermic chemical reaction; the chemical reaction generates high-pressure water vapor to break through the bursting disc, and the fire extinguishing agent inside the fire extinguishing agent storage chamber is ejected through the piston assembly to extinguish the fire.

[0015] As a preferred solution for the pressureless fire extinguisher boosting method for a battery box, the liquid agent is a mixed solution of absolute ethanol and pure water; the solid agent is anhydrous aluminum chloride; the chemical reactions include:

[0016] AlCl 3 =Al 3+ +3Cl -

[0017]

[0018] AlCl 3 +3C 2 H 5 OH→Al(C 2 H 5 O) 3 +3HCl

[0019] Al(C 2 H 5 O) 3 +3C 2 H 5 OH→Al(OH) 3 +3C 2 H 5 -O-C 2 H 5

[0020] Al(OH) 3 →AlOOH+H 2 O。

[0021] As a preferred solution for the pressureless fire extinguisher boosting method for a battery box, the mass ratio of the liquid agent to the solid agent is 0.3 to 15.

[0022] As a preferred solution for the pressureless fire extinguisher boosting method for a battery box, the volume ratio of absolute ethanol to pure water is 6:4.

[0023] The technical solution of the present invention divides the interior of the housing into a fire extinguishing agent storage chamber, a first chemical reaction chamber, and a second chemical reaction chamber; a piston assembly is provided between the fire extinguishing agent storage chamber and the first chemical reaction chamber, and the piston assembly includes a driving part, and one end of the driving part is provided with a bursting disc spaced from the first chemical reaction chamber; an isolation assembly is provided between the first chemical reaction chamber and the second chemical reaction chamber. The first chemical reaction chamber is filled with a solid agent, and the second chemical reaction chamber is filled with a liquid agent. The isolation assembly includes a flipping partition that separates the liquid agent and the solid agent. In the normal state: the first chemical reaction chamber and the second chemical reaction chamber are isolated by the isolation assembly. In the fire extinguishing state, the isolation state of the isolation assembly is changed to make the first chemical reaction chamber and the second chemical reaction chamber communicate. After the communication, the solid agent in the first chemical reaction chamber reacts chemically with the liquid agent in the second chemical reaction chamber to generate heat; the water vapor generated by the chemical reaction breaks through the bursting disc to block the piston assembly, and the piston assembly drives the fire extinguishing agent inside the fire extinguishing agent storage chamber to spray and extinguish the fire. The present invention adopts pre-pressureless storage, has no risk of pressure leakage, occupies a small space, has a high safety and stability factor, a long service life, strong environmental adaptability, and good use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0025] Figure 1 It is a schematic structural diagram of a pressureless fire extinguisher boosting device for a battery box provided in an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of a pressureless fire extinguisher boosting method for a battery box provided in an embodiment of the present invention.

[0027] In the figure, 1, housing; 2, fire extinguishing agent storage chamber; 3, first chemical reaction chamber; 4, second chemical reaction chamber; 5, piston assembly; 6, driving part; 7, bursting disc; 8, isolation assembly; 9, flipping partition; 10, driving piston; 11, driving motor; 12, sealing ring; 13, pressure relief port; 14, start switch; 15, fire extinguishing agent nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 , a pressureless fire extinguisher booster device for a battery box is provided, comprising a shell 1, wherein the interior of the shell 1 is divided into a fire extinguishing agent storage chamber 2, a first chemical reaction chamber 3, and a second chemical reaction chamber 4; a piston assembly 5 is provided between the fire extinguishing agent storage chamber 2 and the first chemical reaction chamber 3, and a bursting disc 7 is provided at one end of the piston assembly 5 for spacing the first chemical reaction chamber 3; an isolation assembly 8 including a flip baffle 9 is provided between the first chemical reaction chamber 3 and the second chemical reaction chamber 4, the first chemical reaction chamber 3 is filled with a solid agent, and the second chemical reaction chamber 4 is filled with a liquid agent;

[0030] The flip partition 9 separates the liquid medicine from the solid medicine, and the flip partition 9 changes the isolation state by flipping to mix the liquid medicine with the solid medicine.

[0031] Specifically, the piston assembly 5 includes a driving part 6, one end of which is provided with a bursting disc 7 separating the first chemical reaction chamber 3; the piston assembly 5 also includes a driving piston 10, which is connected to the driving part 6, and the edge of the driving piston 10 is in contact with the inner wall of the shell 1. The interior of the driving part 6 is hollow, and the end opening of the driving part 6 is shielded by the bursting disc 7. The isolation assembly 8 also includes a driving motor 11, which is fixed to the outside of the shell 1, and the driving shaft of the driving motor 11 is connected to the flip partition 9; the edge of the flip partition 9 is wrapped with a sealing ring 12. A pressure relief port 13 is opened on the shell 1 outside the fire extinguishing agent storage chamber 2, and the pressure relief port 13 is connected to a pressure relief valve, and the pressure relief valve is electrically connected to a start switch 14, and a fire extinguishing agent nozzle 15 is provided at the end of the fire extinguishing agent storage chamber 2.

[0032] Specifically, the driving part 6 can be in the form of a rod, a tube, or a telescopic tube. The material of the driving part 6 is preferably a material that does not chemically react with liquid or solid medicines, such as ultra-high density polyethylene.

[0033] Specifically, the bursting pressure of the bursting disc 7 is 1.5 MPa, which makes the fire extinguishing agent spray quickly and stably, enhances the atomization effect, and improves the use effect of the fire extinguishing device.

[0034] Specifically, the flip partition 9 is a disc-shaped stainless steel or aluminum alloy structure with a thickness of 5 to 10 mm. The edge of the flip partition 9 is sealed with a sealing ring 12, and the sealing level is IP67. The flip partition 9 is connected to the drive motor 11, and the flip of the flip partition 9 is controlled by the drive motor 11, thereby controlling the partition and connection between the first chemical reaction chamber 3 and the second chemical reaction chamber 4. When in the daily storage state, the first chemical reaction chamber 3 and the second chemical reaction chamber 4 are partitioned, and when in the working state, the first chemical reaction chamber 3 and the second chemical reaction chamber 4 are connected.

[0035] Specifically, the liquid agent is a mixed solution of anhydrous ethanol and pure water; the solid agent is anhydrous aluminum chloride. The volume ratio of anhydrous ethanol ranges from 0 to 100%, and the freezing point ranges from 0 to -114.3°C. The ratio of anhydrous ethanol to pure water can be adjusted according to the use environment and use requirements so that the freezing point of the ethanol-water solution reaches the target value. When the volume ratio of anhydrous ethanol to pure water is 6:4, the freezing point of the ethanol-water solution can reach -40°C. Anhydrous aluminum chloride is easily soluble in water in the mixed solution. After dissolving in water, anhydrous aluminum chloride ionizes into anions and cations, namely Al 3+ and Cl - , AlCl 3 It forms a strong electrolyte, exists in the form of ions, and hydrolyzes strongly, releasing a large amount of heat.

[0036] Since the first chemical reaction chamber 3 is filled with anhydrous aluminum chloride and the second chemical reaction chamber 4 is filled with a mixed solution of anhydrous ethanol and pure water, after the driving motor 11 drives the flip baffle 9 to flip, the liquid medicine and the solid medicine can be mixed and chemically reacted within a range of 360°, thereby achieving pressure-free 360° use.

[0037] Specifically, the fire extinguishing agent storage chamber 2 is filled with perfluorohexanone fire extinguishing agent or fire extinguishing agent containing fluorinated ketone substances. The fire extinguishing agent is liquid at room temperature and is easy to store. For lithium-ion batteries, the fire extinguishing concentration of perfluorohexanone is set to 6.5% to 7.0%.

[0038] When the lithium-ion battery in the battery box has thermal runaway, the drive motor 11 starts working, driving the flip partition 9 to flip, and then the liquid agent and the solid agent are mixed to react chemically, strongly hydrolyze, and release a large amount of heat, and instantly generate a large amount of gas. When the pressure reaches the bursting pressure of the bursting disc 7, the bursting disc 7 opens, and the gas pushes the drive piston 10 through the hollow drive part 6, and the fire extinguishing agent is quickly and stably sprayed out through the fire extinguishing agent nozzle 15 to achieve the purpose of fire extinguishing. When the fire extinguishing agent is sprayed, the drive piston 10 reaches the start switch 14 position, and the pressure relief port 13 is opened by the start switch 14, and the remaining pressure is relieved through the pressure relief port 13, eliminating the pressure and eliminating safety hazards.

[0039] In one embodiment of a pressureless fire extinguisher booster device for a battery box, the pressureless fire extinguisher booster device is placed in a -40°C environment for 3 hours, the volume of the first chemical reaction chamber 3 is 400ml, the volume of the second chemical reaction chamber 4 is 600ml, the volume of the anhydrous ethanol and pure water mixed solution of the second chemical reaction chamber 4 is 250ml, wherein the volume ratio of anhydrous ethanol to pure water is 6:4, the mass of anhydrous aluminum chloride is 150g, and after the anhydrous ethanol and pure water mixed solution is mixed with anhydrous aluminum chloride, the anhydrous aluminum chloride is strongly hydrolyzed, and a large amount of heat is released, and a large amount of gas is generated, and the instantaneous pressure value reaches more than 1.5MPa, the bursting disc 7 opens, and the gas drives the piston 10 through the driving part 6, and the fire extinguishing agent is quickly and stably sprayed out through the fire extinguishing agent nozzle 15 to achieve the purpose of fire extinguishing.

[0040] See also Figure 2 The present invention also provides a method for boosting a pressureless fire extinguisher for a battery box. The pressureless fire extinguisher boosting device for a battery box is used. Under normal conditions: the first chemical reaction chamber 3 and the second chemical reaction chamber 4 are isolated by an isolation component 8. The first chemical reaction chamber 3 is filled with a solid agent, and the second chemical reaction chamber 4 is filled with a liquid agent. The flip partition 9 of the isolation component 8 isolates the liquid agent from the solid agent.

[0041] In the fire extinguishing state: the isolation state of the isolation assembly 8 is changed, and the flip partition 9 of the isolation assembly 8 is flipped to connect the first chemical reaction chamber 3 and the second chemical reaction chamber 4. After the connection, the solid agent in the first chemical reaction chamber 3 and the liquid agent in the second chemical reaction chamber 4 are mixed and an exothermic chemical reaction occurs; the chemical reaction generates high-pressure water vapor to break through the bursting disc 7, and the fire extinguishing agent in the fire extinguishing agent storage chamber 2 is sprayed through the piston assembly 5 to extinguish the fire.

[0042] Specifically, the mass ratio of the liquid agent to the solid agent is 0.3 to 15. The volume ratio of anhydrous ethanol to pure water is 6:4. The liquid agent is a mixed solution of anhydrous ethanol and pure water; the solid agent is anhydrous aluminum chloride; the chemical reaction includes:

[0043] AlCl 3 =Al 3+ +3Cl -

[0044]

[0045] AlCl 3 +3C 2 H 5 OH→Al(C 2 H 5 O) 3 +3HCl

[0046] Al(C 2 H 5 O) 3 +3C 2 H 5 OH→Al(OH) 3 +3C 2 H 5 -O-C 2 H 5

[0047] Al(OH) 3 →AlOOH+H 2 O。

[0048] Anhydrous aluminum chloride is highly soluble in the pure water in the mixed solution. AlCl 3 ionizes into anions and cations after dissolving in water, which are Al 3+ and Cl - respectively. AlCl 3 forms a strong electrolyte, exists in the form of ions, and undergoes strong hydrolysis, releasing a large amount of heat.

[0049] Anhydrous aluminum chloride is also soluble in ethanol in the mixed solution and releases a large amount of heat. The products are mainly the dehydration products of aluminum hydroxide at various levels, and with the increase of temperature and the prolongation of time, they are finally converted into hydroxyaluminum oxide (AlOOH). AlCl 3 dissolves in ethanol in the form of AlCl 3 molecules. The outermost electrons of the Al atom in the AlCl 3 molecule are only 6, which does not reach the 8-electron stable structure. Therefore, it can still accept a lone electron pair to form a coordination bond. And ethanol (C 2 H 5 OH) molecule has a hydroxyl group (-OH). In the hydroxyl group (-OH), the O atom forms 1 single bond (1 shared electron pair) with the left and right C atoms and H atoms respectively. Therefore, there are still two lone electron pairs left in the O atom. When the O atom end of the ethanol molecule (C 2 H 5 OH) approaches the Al atom end of the AlCl 3 molecule, the O atom of the ethanol molecule (C 2 H 5 OH) unilaterally provides a pair of its lone pair electrons to the Al atom to form a coordination bond, thus making the outermost layer of the central Al atom reach the 8-electron stable structure.

[0050] The technical solution of the present invention divides the interior of the shell 1 into a fire extinguishing agent storage chamber 2, a first chemical reaction chamber 3 and a second chemical reaction chamber 4; a piston assembly 5 is provided between the fire extinguishing agent storage chamber 2 and the first chemical reaction chamber 3, and the piston assembly 5 includes a driving part 6, and one end of the driving part 6 is provided with a bursting disc 7 that separates the first chemical reaction chamber 3; an isolation assembly 8 is provided between the first chemical reaction chamber 3 and the second chemical reaction chamber 4, the first chemical reaction chamber 3 is filled with solid medicine, and the second chemical reaction chamber 4 is filled with liquid medicine, and the isolation assembly 8 includes a flip partition 9, which isolates the liquid medicine from the solid medicine. Under normal conditions: the first chemical reaction chamber 3 and the second chemical reaction chamber 4 are isolated by the isolation assembly 8. Under the fire extinguishing state, the isolation state of the isolation assembly 8 is changed to make the first chemical reaction chamber 3 and the second chemical reaction chamber 4 connected, and the solid agent in the first chemical reaction chamber 3 and the liquid agent in the second chemical reaction chamber 4 react with heat in an exothermic chemical reaction after the conduction; the water vapor produced by the chemical reaction breaks through the barrier of the piston assembly 5 by the bursting disc 7, so that the piston assembly 5 drives the fire extinguishing agent in the fire extinguishing agent storage chamber 2 to spray and extinguish the fire. The present invention adopts pre-pressureless storage, no risk of pressure leakage, small space occupation, high safety and stability coefficient, long service life, can be used at low temperature (-40°C), strong environmental adaptability, the chemical properties of the agent itself are stable, easy to store, and no safety hazards; the bursting disc 7 makes the fire extinguishing agent spray fast and stable, enhances the atomization effect, and improves the use effect of the fire extinguishing device.

[0051] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A non-pressure fire extinguisher boosting device for a battery box, comprising a housing (1). Characterized in that, The interior of the housing (1) is divided into a fire extinguishing agent storage chamber (2), a first chemical reaction chamber (3) and a second chemical reaction chamber (4); a piston assembly (5) is provided between the fire extinguishing agent storage chamber (2) and the first chemical reaction chamber (3), and a rupture disc (7) spaced from the first chemical reaction chamber (3) is provided at one end of the piston assembly (5); an isolation assembly (8) including a flip partition (9) is provided between the first chemical reaction chamber (3) and the second chemical reaction chamber (4), the first chemical reaction chamber (3) is filled with a solid agent, and the second chemical reaction chamber (4) is filled with a liquid agent. The flip partition (9) separates the liquid agent and the solid agent, and the flip partition (9) changes the isolation state by flipping to mix the liquid agent and the solid agent.

2. A non-pressure fire extinguisher boosting device for a battery box according to claim 1, Characterized in that, The isolation assembly (8) further includes a driving motor (11), the driving motor (11) is fixed outside the housing (1), and the driving shaft of the driving motor (11) is connected to the flip partition (9); a sealing ring (12) is wrapped around the edge of the flip partition (9).

3. A non-pressure fire extinguisher boosting device for a battery box according to claim 1, Characterized in that, The piston assembly (5) further includes a driving part (6), and a rupture disc (7) spaced from the first chemical reaction chamber (3) is provided at one end of the driving part (6); The piston assembly (5) further includes a driving piston (10), the driving piston (10) is connected to the driving part (6), and the edge of the driving piston (10) contacts the inner wall of the housing (1).

4. A non-pressure fire extinguisher boosting device for a battery box according to claim 3, Characterized in that, The interior of the driving part (6) is hollow, and the end opening of the driving part (6) is shielded by the rupture disc (7).

5. A non-pressure fire extinguisher boosting device for a battery box according to claim 1, Characterized in that, The fire extinguishing agent storage chamber (2) is filled with perfluoromethylcyclohexanone fire extinguishing agent or a fire extinguishing agent containing fluorinated ketone substances; the liquid agent is a mixed solution of absolute ethanol and pure water; the solid agent is anhydrous aluminum chloride.

6. A non-pressure fire extinguisher boosting device for a battery box according to claim 1, Characterized in that, A pressure relief port (13) is opened on the housing (1) outside the fire extinguishing agent storage chamber (2), the pressure relief port (13) is connected to a pressure relief valve, and the pressure relief valve is electrically connected to a start switch (14); a fire extinguishing agent spray port (15) is provided at the end of the fire extinguishing agent storage chamber (2).

7. A non-pressure fire extinguisher boosting method for a battery box, using the non-pressure fire extinguisher boosting device for a battery box according to any one of claims 1 to 6, Characterized in that, In a normal state: the first chemical reaction chamber (3) and the second chemical reaction chamber (4) are isolated by an isolation component (8), the first chemical reaction chamber (3) is filled with a solid medicine, the second chemical reaction chamber (4) is filled with a liquid medicine, and the flip partition (9) of the isolation component (8) isolates the liquid medicine from the solid medicine; In the fire extinguishing state: the isolation state of the isolation component (8) is changed, and the flip partition (9) of the isolation component (8) is flipped to connect the first chemical reaction chamber (3) and the second chemical reaction chamber (4). After the connection, the solid agent in the first chemical reaction chamber (3) and the liquid agent in the second chemical reaction chamber (4) are mixed and an exothermic chemical reaction occurs; the chemical reaction generates high-pressure water vapor to break through the bursting disc (7), and the fire extinguishing agent in the fire extinguishing agent storage chamber (2) is sprayed through the piston component (5) to extinguish the fire.

8. A method for boosting a pressureless fire extinguisher for a battery box according to claim 7, It is characterized in that The liquid medicine is a mixed solution of anhydrous ethanol and pure water; The solid agent is anhydrous aluminum chloride; the chemical reaction includes: AlCl 3 = Al 3+ + 3Cl - AlCl 3 +3C 2 H 5 OH→Al(C 2 H 5 O) 3 +3HCl Al(C 2 H 5 O) 3 +3C 2 H 5 OH→Al(OH) 3 +3C 2 H 5 -O-C 2 H 5 Al(OH) 3 →AlOOH + H 2 O。 9. A method for boosting a pressureless fire extinguisher for a battery box according to claim 8, It is characterized in that The mass ratio of the liquid medicine to the solid medicine is 0.3-15.

10. A method for boosting a pressureless fire extinguisher for a battery box according to claim 8, It is characterized in that The volume ratio of the anhydrous ethanol to pure water is 6:4.

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