Battery fire-extinguishing agent, and preparation method therefor and application thereof

Abstract

The present invention provides a battery fire-extinguishing agent, and a preparation method therefor and an application thereof. The battery fire-extinguishing agent comprises the following components in parts by weight: 10-70 parts of insulating cooling oil, 30-90 parts of a halogenated hydrocarbon, and 0.5-5 parts of an interfacial compatibilizer. The insulating cooling oil is selected from one or more of mineral oil, macromolecular hydrocarbon oil, silicone oil, a synthetic ester, and vegetable oil. The number of carbon atoms of the halogenated hydrocarbon is 2-4, and the halogen in the halogenated hydrocarbon is one or more of fluorine, chlorine, bromine, and iodine. The battery fire-extinguishing agent provided by the present invention has high insulating properties, good low-temperature fluidity, and low surface tension, can effectively suppress battery fires, and has a long-lasting cooling and heat dissipation effect, effectively preventing battery reignition; and the battery fire-extinguishing agent is suitable for extinguishing battery fires.

Description

A battery fire extinguishing agent and its preparation method and application

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 2024100840718, filed on January 19, 2024, entitled “A Battery Fire Extinguishing Agent, Its Preparation Method and Application,” the entire disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present invention relates to the technical field of battery fire extinguishing agents, and in particular to a battery fire extinguishing agent and a preparation method and application thereof. Background Art

[0004] Batteries offer advantages such as high operating voltage, high energy density, high specific capacity, long cycle life, and fast response speed. They are widely used in various fields and are closely related to people's lives. However, batteries are prone to thermal runaway if they encounter external factors such as collision, extrusion, immersion in water, overcharging, and overheating during storage, transportation, and use. Once thermal runaway occurs, it can cause fire or explosion. Battery safety issues have severely restricted the rapid development of the new energy industry, and there is an urgent need for a fire extinguishing agent suitable for battery fires.

[0005] Currently, the fire extinguishing agents commonly used for battery fires include gas extinguishing agents, dry powder extinguishing agents, and water-based extinguishing agents. Commonly used gas extinguishing agents include CO2, heptafluoropropane, and perfluorohexanone. These primarily extinguish fires by diluting oxygen, but are limited in their effectiveness against battery fires in open spaces and are unable to prevent re-ignition. Dry powder extinguishing agents extinguish fires by isolating oxygen, but are less effective at cooling the battery. After extinguishing a fire, internal heat is difficult to dissipate, making re-ignition and explosion highly likely. Water-based extinguishing agents typically use pure water or water with physical or chemical additives. While they have a certain cooling effect, they have poor insulation properties and can cause short circuits during the fire extinguishing process, posing a greater risk.

[0006] Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides a battery fire extinguishing agent and a preparation method and application thereof.

[0008] In a first aspect, the present invention provides a battery fire extinguishing agent comprising the following components in parts by weight: 10 to 70 parts of insulating cooling oil, 30 to 90 parts of halogenated hydrocarbon, and 0.5 to 5 parts of an interfacial compatibilizer;

[0009] The insulating cooling oil is selected from one or more of mineral oil, macromolecular hydrocarbon oil, silicone oil, synthetic ester, and vegetable oil;

[0010] The carbon number of the halogenated hydrocarbon is 2-4, and the halogen in the halogenated hydrocarbon is one or more of fluorine, chlorine, bromine and iodine.

[0011] Insulating cooling oil has excellent insulation properties but is flammable. Conventional approaches in this field have been to add flame retardants. However, traditional flame retardants are almost insoluble in such oils, and even if they do, they significantly impair the oil's performance. The inventors unexpectedly discovered that using halogenated hydrocarbons with 2-4 carbon atoms, or low-molecular-weight halogenated hydrocarbons, can impart excellent flame retardancy to insulating cooling oils. The addition of an interfacial compatibilizer crosslinks the insulating cooling oil and halogenated hydrocarbons, enhancing the penetration of the fire extinguishing agent and improving cooling performance.

[0012] The product of the present invention has high fire extinguishing efficiency and can effectively extinguish battery fires. The product of the present invention is an oil-based fire extinguishing agent with high insulation performance, will not cause short circuits, and has low surface tension and strong penetration ability. It can effectively absorb heat inside the battery, has a fast heat dissipation effect, and effectively prevents the battery from reigniting.

[0013] Among them, mineral oil includes No. 10 transformer insulating cooling oil, No. 25 transformer insulating cooling oil, No. 45 transformer insulating cooling oil, etc.

[0014] Macromolecular hydrocarbon oils include α oil, β oil, α polyolefins, etc.

[0015] Vegetable oils include common vegetable oils such as soybean oil, corn oil, peanut oil, etc.

[0016] Silicone oil includes methyl silicone oil, ethyl silicone oil and functionalized silicone oil, such as dimethyl silicone oil, diethyl silicone oil, benzyl silicone oil, amino methyl silicone oil, etc.

[0017] Synthetic esters include monoesters, diesters, polyol esters, phosphate esters, etc., such as methyl oleate, diethylhexyl carbonate, triethylhexanoin, trioctyl phosphate, etc.

[0018] In some embodiments of the present invention, the halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, tetrabromoethane, tetrabromoethylene, hexachloroethane, dibromotetrafluoroethane, dibromotetrachloroethane, tribromotrifluoroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, dibromohexafluoropropane, trichloropentafluoropropane, hexachloropropylene, hexachlorobutadiene, dibromooctafluorobutane, dibromohexafluorocyclobutane, dichlorooctafluorobutane, dichlorohexafluorocyclobutane, and diiodoperfluorobutane.

[0019] Further preferably, the halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, hexachloropropylene, and hexachlorobutadiene.

[0020] In some embodiments of the present invention, the insulating cooling oil is selected from one or more of No. 10 transformer insulating cooling oil, No. 25 transformer insulating cooling oil, and No. 45 transformer insulating cooling oil.

[0021] In some embodiments of the present invention, the interfacial compatibilizer is a fluorine-containing silane coupling agent.

[0022] Further preferably, the interfacial compatibilizer is selected from one or more of triethoxy (1H, 1H, 2H, 2H-nonafluorohexyl) silane, perfluorooctyl triethoxy silane, perfluorodecyl triethoxy silane, and perfluorododecyl triethoxy silane.

[0023] In a preferred embodiment of the present invention, the battery fire extinguishing agent comprises the following components in parts by weight: 10 to 60 parts of insulating cooling oil, 40 to 90 parts of halogenated hydrocarbons, and 1 to 5 parts of an interfacial compatibilizer; wherein the insulating cooling oil is selected from one or more of No. 10 transformer insulating cooling oil, No. 25 transformer insulating cooling oil, and No. 45 transformer insulating cooling oil; the halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, hexachloropropylene, and hexachlorobutadiene; and the interfacial compatibilizer is selected from one or more of triethoxy (1H, 1H, 2H, 2H-nonafluorohexyl) silane, perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, and perfluorododecyltriethoxysilane.

[0024] In a second aspect, the present invention provides a method for preparing the battery fire extinguishing agent.

[0025] The preparation method provided by the present invention comprises the following steps:

[0026] (1) Blending: Weigh the insulating cooling oil by weight and add it into a sealed container, then weigh the halogenated hydrocarbon and add it to the insulating cooling oil, heat and stir to obtain a mixed oil;

[0027] (2) Cross-linking: adding an interfacial compatibilizer to the mixed oil under mechanical stirring, and continuing to heat and stir to cause the mixed oil to undergo cross-linking, thereby obtaining a battery fire extinguishing agent.

[0028] The preparation process of the invention is simple, the cost is low, and it is suitable for large-scale production and application.

[0029] Furthermore, in step (1), the heating and stirring temperature is 50-80° C., the stirring speed is 600-1200 r / min, and the stirring time is 0.5-2 h.

[0030] Furthermore, in step (2), the interfacial compatibilizer is added in batches multiple times, the heating and stirring temperature is 60-100° C., the stirring speed is 800-1500 r / min, and the stirring time is 6-24 h.

[0031] In a third aspect, the present invention provides a fire extinguishing device comprising the above-mentioned battery fire extinguishing agent.

[0032] The battery fire extinguishing agent of the present invention is an oil-based fire extinguishing agent. When it is used in fire extinguishing equipment, it does not require any other treatment and can be directly added to the fire extinguisher tank (agent chamber).

[0033] The present invention provides a battery fire extinguishing agent, its preparation method, and application. By rationally compounding insulating cooling oil, a halogenated hydrocarbon containing 2-4 carbon atoms, and an interfacial compatibilizer, the resulting battery fire extinguishing agent not only exhibits high insulation, good low-temperature fluidity, and low surface tension, but also effectively suppresses battery fires, provides sustained cooling and heat dissipation, and effectively prevents battery re-ignition. Furthermore, the present invention features a simple preparation process, facilitates large-scale production, and has promising application prospects. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] If no specific techniques or conditions are specified in the examples, the experiments were carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0036] Example 1

[0037] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 70 parts of No. 25 transformer insulating cooling oil, 30 parts of tetrachloroethylene, and 2 parts of perfluorooctyltriethoxysilane.

[0038] The preparation method is as follows:

[0039] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethylene and add it into the insulating cooling oil. Heat and stir at 80°C at a speed of 600 r / min for 2 h to obtain a mixed oil.

[0040] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 90°C, a stirring speed of 800 r / min, and a stirring time of 6 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0041] Example 2

[0042] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 10 parts of No. 25 transformer insulating cooling oil, 90 parts of tetrachloroethylene, and 2 parts of perfluorooctyltriethoxysilane.

[0043] The preparation method is as follows:

[0044] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethylene and add it into the insulating cooling oil. Heat and stir at 70°C at a speed of 800 r / min for 2 h to obtain a mixed oil.

[0045] (2) Cross-linking: Perfluorooctyltriethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 80°C, a stirring speed of 1000 r / min, and a stirring time of 6 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0046] Example 3

[0047] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 60 parts of No. 25 transformer insulating cooling oil, 40 parts of tetrachloroethylene, and 2 parts of perfluorodecyltriethoxysilane.

[0048] The preparation method is as follows:

[0049] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethylene and add it into the insulating cooling oil. Heat and stir at 60°C at a stirring speed of 1000 r / min for 2 h to obtain a mixed oil.

[0050] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 80°C, a stirring speed of 1000 r / min, and a stirring time of 12 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0051] Example 4

[0052] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 40 parts of No. 25 transformer insulating cooling oil, 60 parts of tetrachloroethylene, and 2 parts of perfluorodecyltriethoxysilane.

[0053] The preparation method is as follows:

[0054] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethylene and add it into the insulating cooling oil. Heat and stir at 60°C at a stirring speed of 1200 r / min for 2 h to obtain a mixed oil.

[0055] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 80°C, a stirring speed of 1500 r / min, and a stirring time of 12 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0056] Example 5

[0057] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 60 parts of No. 25 transformer insulating cooling oil, 40 parts of tetrachloroethane, and 2 parts of perfluorooctyltriethoxysilane.

[0058] The preparation method is as follows:

[0059] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethane and add it into the insulating cooling oil. Heat and stir at 60°C at a stirring speed of 1200 r / min for 1 h to obtain a mixed oil.

[0060] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 80°C, a stirring speed of 1000 r / min, and a stirring time of 12 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0061] Example 6

[0062] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 60 parts of No. 25 transformer insulating cooling oil, 20 parts of tetrachloroethylene, 20 parts of hexachloropropylene, and 2 parts of perfluorodecyltriethoxysilane.

[0063] The preparation method is as follows:

[0064] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethylene and hexachloropropylene and add them into the insulating cooling oil. Heat and stir at 60°C at a stirring speed of 1000 r / min for 2 h to obtain a mixed oil.

[0065] (2) Cross-linking: Add perfluorooctyl triethoxysilane to the above mixed oil under mechanical stirring, and continue heating and stirring at a temperature of 80°C, a stirring speed of 1000 r / min, and a stirring time of 12 hours to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0066] Example 7

[0067] This embodiment provides a battery fire extinguishing agent, which is made from the following raw materials in parts by weight: 50 parts of No. 25 transformer insulating cooling oil, 50 parts of dibromotetrafluoroethane, and 2 parts of perfluorodecyltriethoxysilane.

[0068] The preparation method is as follows:

[0069] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh dibromotetrafluoroethane and add it into the insulating cooling oil. Heat and stir at 60°C at a stirring speed of 1000 r / min for 2 h to obtain a mixed oil.

[0070] (2) Cross-linking: Add perfluorooctyl triethoxysilane to the above mixed oil under mechanical stirring, and continue heating and stirring at a temperature of 80°C, a stirring speed of 1000 r / min, and a stirring time of 12 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0071] Comparative Example 1

[0072] This comparative example provides a battery fire extinguishing agent, which is prepared from the following raw materials in parts by weight: 80 parts of No. 25 transformer insulating cooling oil, 20 parts of tetrachloroethylene, and 2 parts of perfluorooctyltriethoxysilane.

[0073] The preparation method is as follows:

[0074] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh tetrachloroethylene and add it into the insulating cooling oil. Heat and stir at 80°C at a speed of 600 r / min for 2 h to obtain a mixed oil.

[0075] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 90°C, a stirring speed of 800 r / min, and a stirring time of 24 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0076] Comparative Example 2

[0077] This comparative example provides a battery fire extinguishing agent, which is prepared from the following raw materials in parts by weight: 60 parts of No. 25 transformer insulating cooling oil and 40 parts of tetrachloroethylene.

[0078] The preparation method is as follows:

[0079] Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container, then weigh tetrachloroethylene and add it into the insulating cooling oil, heat and stir at 60°C, the stirring speed is 1000r / min, and the stirring time is 2h to obtain a mixed oil.

[0080] Comparative Example 3

[0081] The battery is subjected to a fire extinguishing test using water.

[0082] Comparative Example 4

[0083] This comparative example provides a battery fire extinguishing agent, which is prepared from the following raw materials in parts by weight: 50 parts of No. 25 transformer insulating cooling oil, 50 parts of perfluorooctyl bromide, and 2 parts of perfluorooctyltriethoxysilane.

[0084] The preparation method is as follows:

[0085] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh perfluorooctyl bromide and add it into the insulating cooling oil. Heat and stir at 80°C at a stirring speed of 600 r / min for 2 h to obtain a mixed oil.

[0086] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 90°C, a stirring speed of 800 r / min, and a stirring time of 24 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0087] Comparative Example 5

[0088] This comparative example provides a battery fire extinguishing agent, which is prepared from the following raw materials in parts by weight: 50 parts of No. 25 transformer insulating cooling oil, 50 parts of trimethyl phosphate, and 2 parts of perfluorooctyltriethoxysilane.

[0089] The preparation method is as follows:

[0090] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it into a sealed container. Then weigh trimethyl phosphate and add it into the insulating cooling oil. Heat and stir at 80°C at a stirring speed of 600 r / min for 2 h to obtain a mixed oil.

[0091] (2) Cross-linking: Perfluorooctyl triethoxysilane was added to the above-mentioned mixed oil under mechanical stirring, and heating and stirring were continued at a temperature of 90°C, a stirring speed of 800 r / min, and a stirring time of 24 h to cross-link the mixed oil to obtain a battery fire extinguishing agent.

[0092] Battery fire extinguishing test

[0093] The fire extinguishing agents of the embodiments and comparative examples were respectively loaded into a fine water mist spray gun and used as fire extinguishing equipment to carry out a battery fire extinguishing test. The test method is as follows:

[0094] A 100% SOC lithium battery and a heating plate were fixed on a test bench. The heating plate power was 1000W, and uniform heating was set at a heating rate of 20°C / min. A thermocouple was placed at the center of the side of the lithium battery to collect changes in the surface temperature of the lithium battery during the test. A fine water mist spray gun was set 60 cm above the lithium battery, and the spray gun pressure was set to 6.5MPa, the flow rate was 10L / min, and the atomization angle was 60°. After the test setup was completed, the heating device was started to heat the lithium battery until thermal runaway occurred, the battery safety valve opened, and the heating device was turned off. When a large amount of combustible gas was released from the safety valve and an open flame appeared, the fine water mist spray gun was started to extinguish the fire. The fire extinguishing time was observed. After the open flame was extinguished, the spraying was stopped and the observation was continued for 60 minutes to observe whether there was any re-ignition. The highest surface temperature of the lithium battery during the fire extinguishing process was recorded, and the cooling rate from the highest temperature to 200°C was calculated.

[0095] The main parameters of the test lithium battery are as follows:

[0096] Type: square aluminum shell ternary lithium battery;

[0097] Dimensions: 150mm×105mm×80mm (length×width×height);

[0098] Rated capacity: 150Ah;

[0099] Rated voltage: 3.7V;

[0100] Positive and negative electrode materials: The negative electrode is graphite, and the positive electrode is lithium nickel cobalt manganese oxide [Li(NiCoMn)O2];

[0101] Electrolyte composition: solvent is ethylene carbonate and propylene carbonate; solute is lithium hexafluorophosphate.

[0102] The results are shown in Table 1.

[0103] Table 1

[0104] Fire extinguishing tests revealed that the battery fire extinguishing agent obtained by the present invention has high fire extinguishing efficiency, a fast cooling rate, and no re-ignition phenomenon. In Comparative Example 1, the amount of halogenated hydrocarbon added was low, and there was a possibility of re-ignition. In Comparative Example 2, no interfacial compatibilizer was added, the fire extinguishing agent had weak penetration ability, and the cooling rate inside the battery was slow. In Comparative Example 3, water had low fire extinguishing efficiency on the battery and re-ignition phenomenon occurred. In addition, conventional flame retardants in Comparative Examples 4 and 5 were difficult to achieve efficient fire extinguishing, further demonstrating the superiority of the present invention.

[0105] It should be noted that the endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed herein.

[0106] In the description of this specification, the reference terms "one embodiment", "some embodiments", "specific implementation methods", or "some specific implementation methods" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention. Industrial Applicability

[0108] The present invention provides a battery fire extinguishing agent, its preparation method, and application. The battery fire extinguishing agent comprises the following components by weight: 10 to 70 parts of insulating cooling oil, 30 to 90 parts of halogenated hydrocarbon, and 0.5 to 5 parts of an interfacial compatibilizer; the insulating cooling oil is selected from one or more of mineral oil, macromolecular hydrocarbon oil, silicone oil, synthetic ester, and vegetable oil; the halogenated hydrocarbon has 2 to 4 carbon atoms, and the halogen in the halogenated hydrocarbon is one or more of fluorine, chlorine, bromine, and iodine. The battery fire extinguishing agent provided by the present invention has high insulation, good low-temperature fluidity, and low surface tension. It can effectively suppress battery fires, has a long-lasting cooling and heat dissipation effect, and effectively prevents battery re-ignition. It is suitable for extinguishing battery fires and has good economic value and application prospects.

Claims

1. A battery fire extinguishing agent, characterized in that, It comprises the following components in parts by weight: 10-70 parts of insulating cooling oil, 30-90 parts of halogenated hydrocarbon, and 0.5-5 parts of interfacial compatibilizer; The insulating cooling oil is selected from one or more of mineral oil, macromolecular hydrocarbon oil, silicone oil, synthetic ester, and vegetable oil; The halogenated hydrocarbon has 2-4 carbon atoms, and the halogen in the halogenated hydrocarbon is one or more of fluorine, chlorine, bromine, and iodine.

2. The battery fire extinguishing agent according to claim 1, characterized in that, The halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, tetrabromoethane, tetrabromoethylene, hexachloroethane, dibromotetrafluoroethane, dibromotetrachloroethane, tribromotrifluoroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, dibromohexafluoropropane, trichloropentafluoropropane, hexachloropropene, hexachlorobutadiene, dibromooctafluorobutane, dibromohexafluorocyclobutane, dichlorooctafluorobutane, dichlorohexafluorocyclobutane, and diiodoperfluorobutane.

3. The battery fire extinguishing agent according to claim 2, characterized in that, The halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, hexachloropropene, and hexachlorobutadiene.

4. The battery fire extinguishing agent according to any one of claims 1 to 3, characterized in that The insulating cooling oil is selected from one or more of No. 10 transformer insulating cooling oil, No. 25 transformer insulating cooling oil, and No. 45 transformer insulating cooling oil.

5. The battery fire extinguishing agent according to any one of claims 1-3, characterized in that, The interfacial compatibilizer is a fluorosilane coupling agent.

6. The battery fire extinguishing agent according to claim 5, characterized in that The interfacial compatibilizer is selected from one or more of triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane, perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, and perfluorododecyltriethoxysilane.

7. The battery fire extinguishing agent according to claim 6, characterized in that, The battery fire extinguishing agent comprises the following components in parts by weight: 10-60 parts of insulating cooling oil, 40-90 parts of halogenated hydrocarbon, and 1-5 parts of interfacial compatibilizer.

8. The preparation method of the battery fire extinguishing agent according to any one of claims 1-7, characterized in that, It includes the following steps: (1) Blending: Weigh the insulating cooling oil in parts by weight and add it to a sealed container, then weigh the halogenated hydrocarbon and add it to the insulating cooling oil, heat and stir to obtain a mixed oil. (2) Crosslinking: Under mechanical stirring, add the interfacial compatibilizer to the mixed oil and continue to heat and stir to cause crosslinking of the mixed oil to obtain the battery fire extinguishing agent.

9. The preparation method of the battery fire extinguishing agent according to claim 8, characterized in that, In step (1), the temperature of heating and stirring is 50-80 °C, the stirring speed is 600-1200 r / min, and the stirring time is 0.5-2 h; In step (2), the interfacial compatibilizer is added in batches multiple times, the temperature of heating and stirring is 60-100 °C, the stirring speed is 800-1500 r / min, and the stirring time is 6-24 h.

10. A fire extinguishing device, characterized in that, It includes the battery fire extinguishing agent according to any one of claims 1-7.

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