A battery fire extinguishing agent, its preparation method and application

Abstract

The present invention provides a battery fire extinguishing agent and its preparation method and application. The battery fire extinguishing agent 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. The battery fire extinguishing agent provided by the present invention has high insulation, good low-temperature fluidity, low surface tension, can effectively suppress battery fires, and has a persistent cooling and heat dissipation effect, effectively preventing battery reignition, and is suitable for extinguishing battery fires.

Description

Technical Field

[0001] The present invention relates to the technical field of battery fire extinguishing agents, and particularly relates to a battery fire extinguishing agent, a preparation method thereof and an application thereof. Background Art

[0002] Batteries have the advantages of high working voltage, high energy density, high specific capacity, long cycle life, fast response speed, etc., and are widely used in various fields, being closely related to people's lives. However, if the battery encounters problems such as external collision, extrusion, immersion in water, overcharging, overheating, etc. during storage, transportation and use, it is very likely to have a thermal runaway phenomenon. Once the battery has a thermal runaway, it will lead to fire or explosion. The battery safety problem severely restricts the rapid development of the new energy industry. At present, there is an urgent need for a fire extinguishing agent suitable for battery fires.

[0003] Currently, the fire extinguishing agents commonly used for battery fire extinguishing include gas fire extinguishing agents, dry powder fire extinguishing agents and water-based fire extinguishing agents. Commonly used gas fire extinguishing agents include CO2, heptafluoropropane, perfluorohexanone, etc., which mainly achieve the fire extinguishing effect by diluting oxygen, but have limited fire extinguishing effect on battery fires in open spaces and cannot inhibit the re-ignition phenomenon of the battery; dry powder fire extinguishing agents achieve the fire extinguishing effect by isolating oxygen, have poor effect in cooling, and it is difficult for the heat inside the battery to dissipate after extinguishing, and it is extremely easy to have re-ignition and explosion phenomena; while water-based fire extinguishing agents usually use pure water or add physical or chemical additives to water for fire extinguishing. Although they have a certain cooling effect, the water-based fire extinguishing agents have poor insulation performance and may cause short circuits during the fire extinguishing process, leading to greater danger. Summary of the Invention

[0004] Aiming at the deficiencies existing in the prior art, the present invention provides a battery fire extinguishing agent, a preparation method thereof and an application thereof.

[0005] In the first aspect, the present invention provides a battery fire extinguishing agent, which 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;

[0006] The insulating cooling oil is selected from one or more of mineral oil, macromolecular hydrocarbon oil, silicone oil, synthetic ester, and vegetable oil;

[0007] 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.

[0008] The insulating cooling oil has good insulation properties but is flammable. The conventional approach in the art is to add a flame retardant to it. However, almost all traditional flame retardants are insoluble in the above-mentioned insulating cooling oil. Even if they are soluble in the insulating cooling oil, they cause great damage to the properties of the oil. The inventors surprisingly found that using halogenated hydrocarbons with 2 - 4 carbon atoms, i.e., small molecular weight halogenated hydrocarbons, can endow the insulating cooling oil with good flame retardancy. The addition of an interfacial compatibilizer causes crosslinking between the insulating cooling oil and the halogenated hydrocarbon, resulting in a strong penetration ability of the fire extinguishing agent and high cooling performance.

[0009] The product of the present invention has a high fire extinguishing efficiency, can effectively extinguish battery fires, and belongs to an oil-based fire extinguishing agent. It has high insulation performance, will not cause short-circuit phenomena, has a low surface tension, a strong penetration ability, can effectively absorb the heat inside the battery, has a fast heat dissipation effect, and can effectively prevent the battery from reigniting.

[0010] Among them, the mineral oil includes No. 10 transformer insulating cooling oil, No. 25 transformer insulating cooling oil, No. 45 transformer insulating cooling oil, etc.

[0011] The macromolecular hydrocarbon oils include α oil, β oil, α polyolefin, etc.

[0012] The vegetable oils include common vegetable oils such as soybean oil, corn oil, peanut oil, etc.

[0013] The silicone oil is methyl silicone oil, ethyl silicone oil and their functionalized silicone oils, such as dimethyl silicone oil, diethyl silicone oil, benzyl methyl silicone oil, amino-methyl silicone oil, etc.

[0014] The synthetic esters are monoesters, diesters, polyol esters, phosphate esters, etc., such as methyl oleate, diethylhexyl carbonate, glycerol tri(ethylhexanoate), trioctyl phosphate, etc.

[0015] 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, hexachloropropene, hexachlorobutadiene, dibromooctafluorobutane, dibromohexafluorocyclobutane, dichlorooctafluorobutane, dichlorohexafluorocyclobutane, diiodoperfluorobutane.

[0016] Further preferably, the halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, hexachloropropene, hexachlorobutadiene.

[0017] 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, No. 45 transformer insulating cooling oil.

[0018] In some embodiments of the present invention, the interfacial compatibilizer is a fluorosilane coupling agent.

[0019] More preferably, the interfacial compatibilizer is selected from one or more of triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane, perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, and perfluorododecyltriethoxysilane.

[0020] In a preferred embodiment of the present invention, 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; 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, hexachloropropene, and hexachlorobutadiene; and the interfacial compatibilizer is selected from one or more of triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane, perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, and perfluorododecyltriethoxysilane.

[0021] In a second aspect, the present invention provides a preparation method of the above battery fire extinguishing agent.

[0022] The preparation method provided by the present invention comprises the following steps:

[0023] (1) Blending: Weigh the insulating cooling oil by 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.

[0024] (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 a battery fire extinguishing agent.

[0025] The preparation process of the present invention is simple, with low cost, and is suitable for large-scale production and application.

[0026] Further, 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.

[0027] Further, in step (2), the interfacial compatibilizer is added in batches and 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.

[0028] In a third aspect, the present invention provides a fire extinguishing device comprising the above battery fire extinguishing agent.

[0029] The battery fire extinguishing agent of the present invention belongs to an oil-based fire extinguishing agent. When it is applied to fire extinguishing equipment, no other treatment is required, and it can be directly added to the fire extinguisher tank (agent chamber).

[0030] The present invention provides a battery fire extinguishing agent, its preparation method and application. By reasonably compounding insulating cooling oil, halogenated hydrocarbons with 2 - 4 carbon atoms and an interfacial compatibilizer, the obtained battery fire extinguishing agent not only has advantages such as high insulation, good low-temperature fluidity, and low surface tension, but also can efficiently suppress battery fires, have a long-lasting cooling and heat dissipation effect, and effectively prevent battery reignition. In addition, the preparation process of the present invention is simple, convenient for large-scale production, and has good application prospects. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] For those not specifying specific techniques or conditions in the embodiments, they shall be carried out according to the techniques or conditions described in the literature in this field or according to the product specifications. For reagents or instruments not indicating the manufacturer, they are all conventional products that can be obtained through regular channels.

[0033] Example 1

[0034] This example 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.

[0035] Its preparation method is as follows:

[0036] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it to a sealed container, then weigh tetrachloroethylene and add it to the insulating cooling oil. Heat and stir at 80°C, with a stirring speed of 600 r / min and a stirring time of 2 h to obtain a mixed oil.

[0037] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil, and continue to heat and stir at a temperature of 90°C, a stirring speed of 800 r / min, and a stirring time of 6 h to crosslink the mixed oil and obtain a battery fire extinguishing agent.

[0038] Example 2

[0039] 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.

[0040] The preparation method thereof is as follows:

[0041] (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, with a stirring speed of 800 r / min and a stirring time of 2 h to obtain a mixed oil.

[0042] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil, and continue to heat and stir at a temperature of 80 °C, with a stirring speed of 1000 r / min and a stirring time of 6 h to cause the mixed oil to crosslink and obtain a battery fire extinguishing agent.

[0043] Example 3

[0044] 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.

[0045] The preparation method thereof is as follows:

[0046] (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, with a stirring speed of 1000 r / min and a stirring time of 2 h to obtain a mixed oil.

[0047] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil, and continue to heat and stir at a temperature of 80 °C, with a stirring speed of 1000 r / min and a stirring time of 12 h to cause the mixed oil to crosslink and obtain a battery fire extinguishing agent.

[0048] Example 4

[0049] 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.

[0050] The preparation method thereof is as follows:

[0051] (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, with a stirring speed of 1200 r / min and a stirring time of 2 h to obtain a mixed oil.

[0052] (2) Crosslinking: Under mechanical stirring, perfluorooctyltriethoxysilane was added to the above-mentioned mixed oil, 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 crosslink the mixed oil and obtain a battery fire extinguishing agent.

[0053] Example 5

[0054] This example provides a battery fire extinguishing agent 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.

[0055] Its preparation method is as follows:

[0056] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it to a sealed container, then weigh tetrachloroethane and add it to the insulating cooling oil. Heat and stir at 60 °C, with a stirring speed of 1200 r / min and a stirring time of 1 h to obtain a mixed oil.

[0057] (2) Crosslinking: Under mechanical stirring, perfluorooctyltriethoxysilane was added to the above-mentioned mixed oil, 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 crosslink the mixed oil and obtain a battery fire extinguishing agent.

[0058] Example 6

[0059] This example provides a battery fire extinguishing agent 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 hexachloropropene, and 2 parts of perfluorodecyltriethoxysilane.

[0060] Its preparation method is as follows:

[0061] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it to a sealed container, then weigh tetrachloroethylene and hexachloropropene and add them to the insulating cooling oil. Heat and stir at 60 °C, with a stirring speed of 1000 r / min and a stirring time of 2 h to obtain a mixed oil.

[0062] (2) Crosslinking: Under mechanical stirring, perfluorooctyltriethoxysilane was added to the above-mentioned mixed oil, 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 crosslink the mixed oil and obtain a battery fire extinguishing agent. Dibromotetrafluoroethane

[0063] Example 7

[0064] This example provides a battery fire extinguishing agent 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.

[0065] The preparation method is as follows:

[0066] (1) Blending: Weigh 25# transformer insulating cooling oil and add it to a sealed container. Then weigh dibromotetrafluoroethane and add it to the insulating cooling oil. Heat and stir at 60°C, with a stirring speed of 1000 r / min and a stirring time of 2 h to obtain a mixed oil.

[0067] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil and continue heating and stirring at 80°C, with a stirring speed of 1000 r / min and a stirring time of 12 h to cause crosslinking of the mixed oil and obtain a battery fire extinguishing agent

[0068] Comparative Example 1

[0069] This comparative example provides a battery fire extinguishing agent made from the following raw materials in parts by weight: 80 parts of 25# transformer insulating cooling oil, 20 parts of tetrachloroethylene, and 2 parts of perfluorooctyltriethoxysilane.

[0070] The preparation method is as follows:

[0071] (1) Blending: Weigh 25# transformer insulating cooling oil and add it to a sealed container. Then weigh tetrachloroethylene and add it to the insulating cooling oil. Heat and stir at 80°C, with a stirring speed of 600 r / min and a stirring time of 2 h to obtain a mixed oil.

[0072] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil and continue heating and stirring at 90°C, with a stirring speed of 800 r / min and a stirring time of 24 h to cause crosslinking of the mixed oil and obtain a battery fire extinguishing agent.

[0073] Comparative Example 2

[0074] This comparative example provides a battery fire extinguishing agent made from the following raw materials in parts by weight: 60 parts of 25# transformer insulating cooling oil and 40 parts of tetrachloroethylene.

[0075] The preparation method is as follows:

[0076] Blending: Weigh 25# transformer insulating cooling oil and add it to a sealed container. Then weigh tetrachloroethylene and add it to the insulating cooling oil. Heat and stir at 60°C, with a stirring speed of 1000 r / min and a stirring time of 2 h to obtain a mixed oil.

[0077] Comparative Example 3

[0078] Use water to conduct a fire extinguishing test on the battery.

[0079] Comparative Example 4

[0080] This comparative example 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 perfluorooctyl bromide, and 2 parts of perfluorooctyltriethoxysilane.

[0081] The preparation method is as follows:

[0082] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it to a sealed container. Then weigh perfluorooctyl bromide and add it to the insulating cooling oil. Heat and stir at 80 °C, with a stirring speed of 600 r / min and a stirring time of 2 h to obtain a mixed oil.

[0083] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil and continue heating and stirring at a temperature of 90 °C, a stirring speed of 800 r / min, and a stirring time of 24 h to crosslink the mixed oil and obtain the battery fire extinguishing agent.

[0084] Comparative Example 5

[0085] This comparative example 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 trimethyl phosphate, and 2 parts of perfluorooctyltriethoxysilane.

[0086] The preparation method is as follows:

[0087] (1) Blending: Weigh No. 25 transformer insulating cooling oil and add it to a sealed container. Then weigh trimethyl phosphate and add it to the insulating cooling oil. Heat and stir at 80 °C, with a stirring speed of 600 r / min and a stirring time of 2 h to obtain a mixed oil.

[0088] (2) Crosslinking: Under mechanical stirring, add perfluorooctyltriethoxysilane to the above-mentioned mixed oil and continue heating and stirring at a temperature of 90 °C, a stirring speed of 800 r / min, and a stirring time of 24 h to crosslink the mixed oil and obtain the battery fire extinguishing agent.

[0089] Battery fire extinguishing test

[0090] Fill the fire extinguishing agents of each example and comparative example into a fine water mist spray gun respectively and conduct a battery fire extinguishing test as a fire extinguishing device. The test method is as follows:

[0091] Fix a 100% SOC lithium battery and a heating plate on the test bench. The power of the heating plate is 1000W, set for uniform heating, with a heating rate of 20°C / min. A thermocouple is arranged at the center position on the side of the lithium battery to collect the surface temperature change of the lithium battery during the test. A fine water mist spray gun is set 60 cm above the lithium battery, with the spray gun pressure set at 6.5 MPa, a flow rate of 10 L / min, and an atomization angle of 60°. After the test settings are completed, start the heating device to heat the lithium battery until the battery undergoes thermal runaway and the safety valve of the battery opens, then turn off the heating device. When a large amount of combustible gas is released from the safety valve and an open flame appears, start the fine water mist spray gun to extinguish the fire, observe the extinguishing time. After the open flame goes out, stop spraying and continuously observe for 60 min to check for re-ignition. Record the highest surface temperature of the lithium battery during the fire extinguishing process and calculate the cooling rate when the temperature drops from the highest temperature to 200°C.

[0092] The main parameters of the lithium battery used in the test are as follows:

[0093] Type: Square aluminum shell ternary lithium battery;

[0094] Size: 150 mm × 105 mm × 80 mm (length × width × height);

[0095] Rated capacity: 150 Ah;

[0096] Rated voltage: 3.7 V;

[0097] Positive and negative electrode materials: The negative electrode is graphite, and the positive electrode is lithium nickel cobalt manganese oxide [Li(NiCoMn)O2];

[0098] Electrolyte composition: The solvent is ethylene carbonate and propylene carbonate; the solute is lithium hexafluorophosphate.

[0099] The results are shown in Table 1.

[0100] Table 1

[0101]

[0102] Through the fire extinguishing test, it can be found 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 addition amount of the halogenated hydrocarbon is relatively low, and there is a possibility of re-ignition. In Comparative Example 2, no interfacial compatibilizer is added, the penetration ability of the fire extinguishing agent is weak, and the cooling rate inside the battery is slow. In Comparative Example 3, water has a low fire extinguishing efficiency for the battery and there is a re-ignition phenomenon. In addition, in Comparative Examples 4 and 5, it is difficult for traditional flame retardants to achieve efficient fire extinguishing, further proving the superiority of the present invention.

[0103] It should be noted that the endpoints and any values within the ranges disclosed in this document are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the values between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this document.

[0104] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "specific implementation manners", or "some specific implementation manners", etc. mean that the specific features, structures, materials, or characteristics described in connection 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 expressions 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. And these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

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 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, diiodoperfluorobutane; 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 interfacial compatibilizer is a fluorosilane coupling agent.

2. The battery fire extinguishing agent according to claim 1, wherein The halogenated hydrocarbon is selected from one or more of tetrachloroethylene, tetrachloroethane, hexachloropropene, and hexachlorobutadiene.

3. The battery fire extinguishing agent according to claim 1, wherein The interfacial compatibilizer is selected from one or more of triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane, perfluorooctyltriethoxysilane, perfluorodecyltriethoxysilane, perfluorododecyltriethoxysilane.

4. The battery fire extinguishing agent according to claim 1, wherein, 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.

5. The preparation method of the battery fire extinguishing agent according to any one of claims 1-4, 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 the mixed oil to crosslink to obtain the battery fire extinguishing agent.

6. The preparation method of the battery fire extinguishing agent according to claim 5, 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 and 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.

7. A fire extinguishing device, characterized in that, It includes the battery fire extinguishing agent according to any one of claims 1-4.

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