Compound lithium ion battery extinguishing agent, preparation method and application thereof

Abstract

The application belongs to the technical field of fire extinguishing, and provides a compound lithium ion battery extinguishing agent, a preparation method and application thereof, the extinguishing agent comprises the following raw materials in parts by weight: vermiculite 14-35 parts, pentaerythritol 4-8 parts, chlorinated paraffin 5-10 parts, antimony trioxide 5-10 parts, hydrocarbon surfactant 1-5 parts, water 31-40 parts, silicone oil 1-9 parts, foaming agent 0.5-3 parts. The compound lithium ion battery extinguishing agent reaches the purpose of simple, effective and efficient fire extinguishing for open space lithium battery fire through the synergistic effect of vermiculite, chlorinated paraffin, antimony trioxide and pentaerythritol, and the fire extinguishing is complete and the fire is not easy to reignite.

Description

Technical Field

[0001] This application relates to the field of fire extinguishing technology, and in particular to a compound lithium-ion battery fire extinguishing agent, its preparation method, and its application. Background Technology

[0002] Lithium-ion batteries are rechargeable batteries that use graphite or other carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. They have advantages such as high energy density, low self-discharge, long life, and environmental friendliness, and are hailed as the "green energy of the 21st century." Lithium-ion batteries have a wide range of applications, covering energy storage, power, consumer and special applications, providing powerful impetus for the development of human society.

[0003] Lithium-ion battery thermal runaway refers to an irreversible thermal reaction that occurs in lithium-ion batteries under abnormal conditions, such as overcharging, over-discharging, or short circuits, potentially leading to serious consequences such as battery explosion and fire. Thermal runaway is generally caused by internal battery processes, such as electrolyte decomposition, lithium metal deposition, and redox reactions. As the reaction progresses, the large amount of heat generated inside the battery accelerates the process, leading to increased battery temperature and pressure, and the release of harmful gases, which can ultimately cause serious consequences such as explosion and fire.

[0004] Currently, when lithium battery thermal runaway causes fires, dry powder extinguishing agents, water-based extinguishing agents, carbon dioxide extinguishing agents, heptafluoropropane extinguishing agents, aerosol extinguishing agents, and perfluorohexanone extinguishing agents are commonly used to extinguish the fire. However, the aforementioned heptafluoropropane and perfluorohexanone extinguishing agents are only suitable for lithium battery fires in enclosed spaces and are not effective in extinguishing lithium battery fires in open spaces. Furthermore, when dry powder, water-based, and carbon dioxide extinguishing agents are used to extinguish lithium battery fires, reignition is likely to occur within a short period after the open flame is extinguished.

[0005] To address the aforementioned issues, existing technologies, such as patent publication number CN113262420B, disclose a fire extinguishing agent for lithium batteries, its preparation method, its uses, and a pressurized fire extinguisher formed therefrom. The fire extinguishing agent for lithium batteries described in this invention comprises the following raw material components in parts by weight: 30-50 parts clay, 2-6 parts foaming agent, and 35-70 parts water. The fire extinguishing agent for lithium batteries in this invention can rapidly cover the open flame in the combustion zone, isolate oxygen, inhibit thermal runaway reactions, and block the combustion reaction. The pressurized fire extinguisher formed by filling with this fire extinguishing agent uses a driving gas as a power source, which facilitates the spraying of the fire extinguishing agent. The fire extinguisher for lithium batteries in this invention can quickly extinguish open flames when lithium batteries catch fire, reducing the risk of reignition. When used, the fire extinguishing agent of this invention forms a clay aerosol, using physical isolation and cooling to extinguish thermal runaway lithium batteries. However, this invention does not utilize gas to extinguish thermal runaway lithium batteries.

[0006] In summary, if a fire extinguishing agent can be provided that can use solid or gaseous materials to extinguish thermally runaway lithium batteries simply and effectively without reignition, and is applicable to lithium batteries in both enclosed and open spaces, its advantages in lithium battery fire extinguishing technology will be greatly enhanced. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the present invention provides a compound lithium-ion battery fire extinguishing agent, its preparation method and application, to solve the problems of existing fire extinguishing agents being unable to achieve simple, effective and rapid fire extinguishing for lithium battery fires in open spaces.

[0008] To achieve the above and related objectives, the present invention adopts the following technical solution:

[0009] The first aspect of this invention provides a compound lithium-ion battery fire extinguishing agent, which comprises the following raw materials in parts by weight:

[0010] Vermiculite 14-35 parts, pentaerythritol 4-8 parts, chlorinated paraffin 5-10 parts, antimony trioxide 5-10 parts, hydrocarbon surfactant 1-5 parts, water 31-40 parts, silicone oil 1-9 parts, foaming agent 0.5-3 parts.

[0011] In one embodiment of this application, the hydrocarbon surfactant is at least one of sodium octyl sulfonate, alkyl glycoside, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, alkyl carboxylate, alkyl phosphate, and fatty alcohol polyoxyethylene ether.

[0012] In one embodiment of this application, the foaming agent is at least one of sodium fatty alcohol sulfate, sodium alkylbenzene sulfonate, sodium polyoxyethylene fatty alcohol sulfate, and sodium alkyl sulfonate.

[0013] In one embodiment of this application, the vermiculite is expanded vermiculite and / or organically modified expanded vermiculite.

[0014] In one embodiment of this application, when the vermiculite is expanded vermiculite, the particle size distribution is 350-750 mesh; when the vermiculite is organically modified expanded vermiculite, the particle size distribution is 300-600 mesh.

[0015] In one embodiment of this application, the organically modified expanded vermiculite is expanded vermiculite modified with a quaternary ammonium salt, wherein the quaternary ammonium salt is any one of dodecyl, tetradecyl, hexadecyl, and octadecyltrimethylammonium bromide.

[0016] In one embodiment of this application, the extinguishing agent further includes 0.5 to 3 parts by weight of antifreeze, wherein the antifreeze is at least one of ethylene glycol, propylene glycol, and glycerol.

[0017] A second aspect of the present invention provides a method for preparing a compound lithium-ion battery fire extinguishing agent, comprising mixing the components of the compound lithium-ion battery fire extinguishing agent as described above to obtain the compound lithium-ion battery fire extinguishing agent.

[0018] The third aspect of the present invention provides the application of the compound lithium-ion battery fire extinguishing agent as described above in the preparation of fire extinguishers.

[0019] A fourth aspect of the present invention provides a fire extinguisher comprising a compound lithium-ion battery fire extinguishing agent as described above.

[0020] The beneficial technical effects of this invention are as follows:

[0021] To address the problem that existing fire extinguishing agents cannot achieve simple, effective, and rapid fire suppression for lithium battery fires in open spaces, this application prepares a compound lithium-ion battery fire extinguishing agent that does not contain heptafluoropropane, perfluorohexanone, or fluorocarbon surfactants. Vermiculite, chlorinated paraffin, and antimony trioxide are selected as flame retardants. The agent extinguishes thermal runaway lithium batteries by means of physical isolation, oxygen barrier, heat insulation, and dilution of flammable gases.

[0022] When using the compound lithium-ion battery fire extinguishing agent of this application to extinguish thermal runaway lithium batteries, chlorinated paraffin and antimony trioxide react at high temperatures to generate HCl, SbCl3, and SbOCl. SbCl3 and SbOCl are volatile gases that absorb a large amount of heat during volatilization. SbCl3 can also act as a free radical scavenger in the gas-phase combustion zone, effectively capturing free radicals generated by polymer combustion, thus playing a flame-retardant role, diluting combustible gases, and isolating air to achieve an effective flame-retardant effect. Meanwhile, HCl can catalyze the esterification reaction of pentaerythritol, dehydrating it to generate a dense carbon layer. This carbon layer absorbs water vapor present in the open space lithium battery fire environment, causing expansion. The expanded carbon layer achieves oxygen barrier and heat insulation, preventing the lithium battery from reigniting.

[0023] Meanwhile, the compound lithium-ion battery fire extinguishing agent of this application utilizes expanded vermiculite and / or organically modified expanded vermiculite to improve the fire extinguishing agent's resistance to reignition, enhance its heat insulation effect, absorb the large amount of heat released by lithium battery fires, rapidly reduce the flame temperature, and cover the surface of thermally runaway lithium batteries to retard flames through physical isolation.

[0024] The compound lithium-ion battery fire extinguishing agent of this application achieves the purpose of simple, effective and efficient fire extinguishing of lithium battery fires in open spaces through the synergistic effect of vermiculite, chlorinated paraffin, antimony trioxide and pentaerythritol, and the fire is thoroughly extinguished and not easy to reignite.

[0025] In addition, the compound lithium-ion battery fire extinguishing agent of this application contains an antifreeze agent, which makes it stable in low-temperature environments.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Detailed Implementation

[0027] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of the invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. Conversely, multiple features of the invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of the invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of the invention are merely illustrative and should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be covered within the scope of protection of the invention.

[0028] This invention provides a compound lithium-ion battery fire extinguishing agent, comprising the following raw materials in parts by weight: vermiculite 14-35 parts, pentaerythritol 4-8 parts, chlorinated paraffin 5-10 parts, antimony trioxide 5-10 parts, hydrocarbon surfactant 1-5 parts, water 31-40 parts, silicone oil 1-9 parts, foaming agent 0.5-3 parts, and antifreeze 0.5-3 parts; wherein,

[0029] The hydrocarbon surfactant is at least one of sodium octyl sulfonate, alkyl glycoside, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, alkyl carboxylate, alkyl phosphate, and fatty alcohol polyoxyethylene ether;

[0030] The foaming agent is at least one of sodium fatty alcohol sulfate, sodium alkylbenzene sulfonate, sodium polyoxyethylene fatty alcohol sulfate, and sodium alkyl sulfonate;

[0031] The antifreeze is at least one of ethylene glycol, propylene glycol, and glycerol;

[0032] The vermiculite is expanded vermiculite and / or organically modified expanded vermiculite. When the vermiculite is expanded vermiculite, the particle size distribution is 350-750 mesh; when the vermiculite is organically modified expanded vermiculite, the particle size distribution is 300-600 mesh. The organically modified expanded vermiculite is expanded vermiculite modified with quaternary ammonium salt, which is any one of dodecyl, tetradecyl, hexadecyl, and octadecyltrimethylammonium bromide.

[0033] The preparation method of organic modified expanded vermiculite is to grind the expanded vermiculite, pass it through a 300-600 mesh sieve, add it to deionized water, and the mass ratio of expanded vermiculite to deionized water is 1:(8-12). Stir for 10-15 minutes.

[0034] The mass ratio of quaternary ammonium salt to expanded vermiculite is 1:(1-3). The quaternary ammonium salt is added to the aqueous solution of expanded vermiculite, and the mixture is stirred every 15 minutes. The reaction is carried out at a constant temperature of 80°C for 2 hours. The reaction solution is then transferred to an ultrasonic cleaner and ultrasonicated for 20 minutes. The solution is then removed and aged at room temperature for 5 days. After centrifugation and washing, the solution is washed three times with deionized water and dried to obtain organically modified expanded vermiculite.

[0035] This invention also provides a method for preparing a compound lithium-ion battery fire extinguishing agent, comprising mixing the components of the compound lithium-ion battery fire extinguishing agent as described above to obtain the compound lithium-ion battery fire extinguishing agent, specifically:

[0036] Mix the vermiculite and water, stir, add the pentaerythritol, chlorinated paraffin, antimony trioxide, hydrocarbon surfactant, silicone oil, foaming agent and antifreeze, stir until they are evenly mixed, and obtain a compound lithium-ion battery fire extinguishing agent.

[0037] The present invention also provides the application of the compound lithium-ion battery fire extinguishing agent as described above in the preparation of fire extinguishers.

[0038] The present invention also provides a fire extinguisher comprising the compound lithium-ion battery fire extinguishing agent as described above.

[0039] The present invention will be described in detail below through specific examples and embodiments. It should also be understood that the following embodiments are only for specific illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0040] Example 1

[0041] Mix 30 parts by weight of expanded vermiculite with a particle size distribution of 500 mesh and 40 parts by weight of water, stir, add 5 parts by weight of pentaerythritol, 8 parts by weight of chlorinated paraffin, 8 parts by weight of antimony trioxide, 4 parts by weight of sodium dodecylbenzenesulfonate, 4 parts by weight of silicone oil and 1 part by weight of ethylene glycol, stir to make it evenly mixed, and obtain a compound lithium-ion battery fire extinguishing agent.

[0042] Example 2

[0043] Mix 20 parts by weight of expanded vermiculite with a particle size distribution of 600 mesh and 40 parts by weight of water, stir, add 8 parts by weight of pentaerythritol, 10 parts by weight of chlorinated paraffin, 10 parts by weight of antimony trioxide, 2.5 parts by weight of sodium octyl sulfonate, 6.5 parts by weight of silicone oil, 2 parts by weight of sodium dodecylbenzene sulfonate and 1 part by weight of ethylene glycol, stir to mix evenly, and obtain a compound lithium-ion battery fire extinguishing agent.

[0044] Example 3

[0045] 35 parts by weight of expanded vermiculite modified with hexadecyltrimethylammonium bromide with a particle size distribution of 500 mesh were mixed with 35 parts by weight of water and stirred. Then, 5 parts by weight of pentaerythritol, 5 parts by weight of chlorinated paraffin, 5 parts by weight of antimony trioxide, 3 parts by weight of sodium octyl sulfonate, 7 parts by weight of silicone oil, 3 parts by weight of sodium fatty alcohol sulfate, and 2 parts by weight of glycerol were added and stirred until they were mixed evenly to obtain a compound lithium-ion battery fire extinguishing agent.

[0046] The preparation method of hexadecyltrimethylammonium bromide-modified expanded vermiculite is as follows:

[0047] Grind the expanded vermiculite, pass it through a 500-mesh sieve, and add it to deionized water at a mass ratio of 1:10. Stir for 15 minutes.

[0048] The mass ratio of hexadecyltrimethylammonium bromide to expanded vermiculite was 1:1. Hexadecyltrimethylammonium bromide was added to an aqueous solution of expanded vermiculite, and the mixture was stirred every 15 minutes. The reaction was carried out at a constant temperature of 80°C for 2 hours. The reaction solution was then transferred to an ultrasonic cleaner and ultrasonicated for 20 minutes. The solution was then removed and aged at room temperature for 5 days. After centrifugation and washing, the solution was washed three times with deionized water and dried to obtain expanded vermiculite modified with hexadecyltrimethylammonium bromide.

[0049] Example 4

[0050] Mix 16 parts by weight of expanded vermiculite with a particle size distribution of 550 mesh and 40 parts by weight of water, stir, add 8 parts by weight of pentaerythritol, 8 parts by weight of chlorinated paraffin, 8 parts by weight of antimony trioxide, 5 parts by weight of alkyl glycoside, 9 parts by weight of silicone oil, 3 parts by weight of sodium dodecyl sulfonate and 3 parts by weight of propylene glycol, stir to make it evenly mixed, and obtain a compound lithium-ion battery fire extinguishing agent.

[0051] Example 5

[0052] 35 parts by weight of expanded vermiculite modified with octadecyltrimethylammonium bromide with a particle size distribution of 400 mesh were mixed with 40 parts by weight of water and stirred. Then, 4 parts by weight of pentaerythritol, 5 parts by weight of chlorinated paraffin, 5 parts by weight of antimony trioxide, 3 parts by weight of alkyl glycoside, 7 parts by weight of silicone oil, 0.5 parts by weight of sodium dodecyl sulfonate, and 0.5 parts by weight of ethylene glycol were added and stirred until the mixture was homogeneous to obtain a compound lithium-ion battery fire extinguishing agent.

[0053] The preparation method of octadecyltrimethylammonium bromide modified expanded vermiculite is as follows:

[0054] The expanded vermiculite was ground, passed through a 400-mesh sieve, and added to deionized water at a mass ratio of 1:10. The mixture was stirred for 15 minutes.

[0055] The mass ratio of octadecyltrimethylammonium bromide to expanded vermiculite was 1:1. Octadecyltrimethylammonium bromide was added to an aqueous solution of expanded vermiculite, and the mixture was stirred every 15 minutes. The reaction was carried out at a constant temperature of 80°C for 2 hours. The reaction solution was then transferred to an ultrasonic cleaner and ultrasonicated for 20 minutes. The solution was then removed and aged at room temperature for 5 days. After centrifugation and washing, the solution was washed three times with deionized water and dried to obtain expanded vermiculite modified with octadecyltrimethylammonium bromide.

[0056] Example 6

[0057] 15 parts by weight of expanded vermiculite with a particle size distribution of 500 mesh, 20 parts by weight of expanded vermiculite modified with octadecyltrimethylammonium bromide with a particle size distribution of 400 mesh, and 40 parts by weight of water were mixed and stirred. 4 parts by weight of pentaerythritol, 5 parts by weight of chlorinated paraffin, 5 parts by weight of antimony trioxide, 3 parts by weight of alkyl glycoside, 7 parts by weight of silicone oil, 0.5 parts by weight of sodium dodecyl sulfonate, and 0.5 parts by weight of ethylene glycol were added and stirred until they were mixed evenly to obtain a compound lithium-ion battery fire extinguishing agent.

[0058] Comparative Example 1

[0059] Mix 30 parts by weight of expanded vermiculite with a particle size distribution of 500 mesh and 61 parts by weight of water, stir, add 4 parts by weight of sodium dodecylbenzenesulfonate, 4 parts by weight of silicone oil and 1 part by weight of ethylene glycol, stir until they are mixed evenly to obtain the fire extinguishing agent.

[0060] Comparative Example 2

[0061] Mix 30 parts by weight of expanded vermiculite with a particle size distribution of 500 mesh and 40 parts by weight of water, stir, add 10 parts by weight of chlorinated paraffin, 10 parts by weight of antimony trioxide, 4 parts by weight of sodium dodecylbenzenesulfonate, 5 parts by weight of silicone oil and 1 part by weight of ethylene glycol, stir until they are mixed evenly to obtain the fire extinguishing agent.

[0062] Comparative Example 3

[0063] Mix 30 parts by weight of expanded vermiculite with a particle size distribution of 500 mesh and 45 parts by weight of water, stir, add 5 parts by weight of pentaerythritol, 8 parts by weight of chlorinated paraffin, 8 parts by weight of antimony trioxide and 4 parts by weight of sodium dodecylbenzenesulfonate, stir until they are mixed evenly to obtain the fire extinguishing agent.

[0064] Performance testing

[0065] Fire extinguishing performance: The extinguishing agents prepared in Examples 1-6 and Comparative Examples 1-3 were encapsulated in fire extinguishing containers to form pressurized fire extinguishers, each filled with 1 kg and pressurized to 1.2 MPa. The prepared fire extinguishers were subjected to the following fire extinguishing simulation experiments:

[0066] Twelve test lithium batteries were connected in parallel and placed on a heating plate with a power of 1 kW and a temperature of 600℃. The heating plate measured 210mm × 170mm × 15mm. The batteries were charged to 100% SOC and then the power was turned off. The heating plate was heated uniformly at a rate of 20℃ / min. After the batteries experienced thermal runaway and their casings burst open, the heating plate was sprayed with fire extinguishers 20 seconds later. The experimental results are shown in Table 1. (The lithium batteries used in this application were soft-pack ternary lithium-ion NCM811 / graphite system power batteries, with an aluminum outer film.)

[0067] Table 1. Fire extinguishing performance of the fire extinguishing agents prepared in Examples 1-6 and Comparative Examples 1-3.

[0068]

[0069]

[0070] As shown in Table 1, the compound lithium-ion battery fire extinguishing agent prepared in this application can shorten the extinguishing time and number of extinguishing operations, achieving rapid and effective fire extinguishing without reignition. Furthermore, the use of expanded vermiculite and organically modified expanded vermiculite in the preparation of the compound lithium-ion battery fire extinguishing agent further improves its extinguishing speed. In contrast, the fire extinguishing agent of Comparative Example 1 does not contain pentaerythritol, chlorinated paraffin, and antimony trioxide, and only uses vermiculite as a flame retardant, resulting in poor flame retardant effect, long extinguishing time, and the possibility of reignition; therefore, it cannot guarantee extinguishing effectiveness for lithium battery fires. The fire extinguishing agent of Comparative Example 2 uses vermiculite, chlorinated paraffin, and antimony trioxide as flame retardants. Through the physical isolation of vermiculite, it dilutes flammable gases to achieve a flame retardant effect. However, due to the lack of the synergistic isolation effect of pentaerythritol, the fire extinguishing efficiency of Comparative Example 2 is lower than that of the compound lithium-ion battery fire extinguishing agent of this application. Compared with the compound lithium-ion battery fire extinguishing agent of Example 1, the fire extinguishing agent of Comparative Example 3 does not contain antifreeze ethylene glycol and foaming agent silicone oil. Therefore, when it is sprayed on lithium batteries, the fire extinguishing time is relatively longer and there is a possibility of reignition. This is because the components in the fire extinguishing agent of Comparative Example 3 are not mixed evenly.

[0071] Furthermore, experimental testing revealed that the following gaseous components are produced after thermal runaway of a soft-pack ternary lithium battery: hydrogen, oxygen, methane, ethane, ethylene, nitrogen, propane, propylene, carbon dioxide, isobutane, n-butane, propadiene, acetylene, trans-butene, n-butene, isobutene, cis-butene, carbon monoxide, isopentane, n-pentane, 1,3-butadiene, 3-methyl-1-butene, propyne, trans-2-pentene, 2-methyl-2-butene, pentene, 2-methyl-1-butene, cis-2-pentene, butyne, vinylacetylene, and isopentane. Among these, hydrogen, nitrogen, carbon dioxide, and carbon monoxide constitute a relatively high proportion, totaling approximately 89%. Oxygen, methane, and ethylene account for approximately 9.8% of the total content, while the remaining gaseous components are present in trace amounts.

[0072] When the compound lithium-ion battery fire extinguishing agent of this application is used for fire extinguishing, chlorinated paraffin and antimony trioxide react at high temperature to generate HCl and volatile gases SbCl3 and SbOCl. During the volatilization process, SbCl3 and SbOCl continuously absorb heat, reducing the internal temperature of the lithium-ion battery, thereby delaying the occurrence of internal chemical reactions of lithium ions. Furthermore, SbOCl decomposes into SbCl3 and Sb4O5Cl2 when heated. Sb4O5Cl2 has excellent flame retardant effect, and the large amount of SbCl3 generated by the fire extinguishing agent of this application can capture HO· and H· free radicals in the gas phase and form an isolation layer in the solid phase, which provides heat insulation and oxygen isolation. It works synergistically with Sb4O5Cl2 to block the occurrence of internal chemical reactions of lithium ions.

[0073] Meanwhile, the large amounts of SbCl3, SbOCl, and Sb4O5Cl2 generated by the extinguishing agent do not react with the various components of the gas generated by the thermal runaway of the lithium battery. Instead, by continuously diluting the various components of the gas generated by the lithium battery, the concentration of oxygen, hydrogen, methane and other flammable and explosive gases, as well as the concentration of toxic gases such as propane, propylene, and isoprene in the thermal runaway environment of the lithium battery are reduced, thereby achieving a flame-retardant effect and reducing the toxicity generated by the thermal runaway of the lithium battery, thus improving safety.

[0074] This application's compound lithium-ion battery fire extinguishing agent utilizes the generated HCl to undergo an esterification reaction with pentaerythritol, dehydrating to form a dense carbon layer. This layer further absorbs water vapor present in the open space lithium battery fire environment, causing expansion. The expanded carbon layer achieves oxygen barrier and heat insulation, preventing the lithium battery from reigniting.

[0075] Furthermore, the compound lithium-ion battery fire extinguishing agent of this application utilizes expanded vermiculite for a synergistic effect, further enhancing the fire extinguishing effect. Expanded vermiculite adsorbs the fire source, and through its covering and isolating effect, it suppresses the supply of oxygen, preventing the gases generated by the thermal runaway of the lithium battery from reacting with each other at high temperatures and releasing a large amount of heat again, such as the exothermic reaction between oxygen and ethylene at high temperatures.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A compound lithium-ion battery fire extinguishing agent, characterized in that, The extinguishing agent comprises the following raw materials in parts by weight: Vermiculite 14-35 parts, pentaerythritol 4-8 parts, chlorinated paraffin 5-10 parts, antimony trioxide 5-10 parts, hydrocarbon surfactant 1-5 parts, water 31-40 parts, silicone oil 1-9 parts, foaming agent 0.5-3 parts.

2. The compound lithium-ion battery fire extinguishing agent according to claim 1, characterized in that, The hydrocarbon surfactant is at least one of sodium octyl sulfonate, alkyl glycoside, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, alkyl carboxylate, alkyl phosphate, and fatty alcohol polyoxyethylene ether.

3. The compound lithium-ion battery fire extinguishing agent according to claim 1, characterized in that, The foaming agent is at least one of sodium fatty alcohol sulfate, sodium alkylbenzene sulfonate, sodium polyoxyethylene fatty alcohol sulfate, and sodium alkyl sulfonate.

4. The compound lithium-ion battery fire extinguishing agent according to claim 1, characterized in that, The vermiculite is expanded vermiculite and / or organically modified expanded vermiculite.

5. The compound lithium-ion battery fire extinguishing agent according to claim 4, characterized in that, When the vermiculite is expanded vermiculite, the particle size distribution is 350-750 mesh; when the vermiculite is organically modified expanded vermiculite, the particle size distribution is 300-600 mesh.

6. The compound lithium-ion battery fire extinguishing agent according to claim 4, characterized in that, The organically modified expanded vermiculite is expanded vermiculite modified with a quaternary ammonium salt, wherein the quaternary ammonium salt is any one of dodecyl, tetradecyl, hexadecyl, and octadecyltrimethylammonium bromide.

7. The compound lithium-ion battery fire extinguishing agent according to claim 1, characterized in that, The extinguishing agent also includes 0.5 to 3 parts by weight of antifreeze, wherein the antifreeze is at least one of ethylene glycol, propylene glycol, and glycerol.

8. A method for preparing a compound lithium-ion battery fire extinguishing agent, characterized in that, The method includes: mixing the components of the compound lithium-ion battery fire extinguishing agent according to any one of claims 1 to 7 to obtain the compound lithium-ion battery fire extinguishing agent.

9. The application of the compound lithium-ion battery extinguishing agent as described in any one of claims 1 to 7 in the preparation of fire extinguishers.

10. A fire extinguisher, characterized in that, Includes the compound lithium-ion battery fire extinguishing agent as described in any one of claims 1 to 7.

Images