Flame-retardant cooling liquid and preparation method thereof, immersed energy storage device, data center and electric equipment

Abstract

The invention relates to the technical field of energy storage safety, and particularly discloses flame-retardant cooling liquid, a preparation method of the flame-retardant cooling liquid, an immersed energy storage device, a data center and electric equipment. According to the present invention, the base oil is at least one of the liquid halogenated alkane containing 2-6 carbon atoms, the liquid halogenated olefin, the liquid halogenated ketone and the liquid halogenated cycloalkane containing 3-6 carbon atoms, such that the high biodegradability of the base oil is maintained, the system viscosity is effectively reduced, the heat dissipation performance is improved, the insulating property of the base oil is significantly improved, and the service life of the base oil is prolonged. Meanwhile, the flame retardance is further enhanced. Therefore, the heat management efficiency of the cooling liquid is remarkably improved while environmental protection and safety are considered, and the cooling liquid has a good application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage safety, in particular to a flame-retardant cooling liquid, a preparation method thereof, an immersion type energy storage device, a data center and an electrical equipment. BACKGROUND

[0002] As the core of the immersion type energy storage device and the immersion type liquid-cooled data center, the thermal physical properties of the cooling liquid directly affect the operation performance of the lithium battery system and the data center. At present, the cooling liquids used in the immersion type thermal management systems at home and abroad mainly include fluorinated liquids, hydrocarbons, esters and silicone oils. The basic principles for selecting the cooling liquids mainly include: (1) high insulation performance to ensure no conduction; (2) excellent thermal conductivity to ensure timely heat dissipation; (3) excellent flame retardant performance to prevent the spread of thermal runaway; (4) material compatibility friendly, which does not cause corrosion to the materials of the lithium battery system; (5) no irritating odor, which is conducive to large-scale preparation and application. In addition, with the increasing seriousness of global climate change and environmental problems, it is also increasingly important to improve the biodegradability of the cooling liquid, ensure the rapid decomposition of the cooling liquid in the environment, and reduce the pollution and damage to the environment.

[0003] However, the existing cooling liquids are difficult to have high biodegradability while taking into account high heat dissipation performance, high insulation performance and high flame retardant performance. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, one object of the present application is to provide a flame-retardant cooling liquid that has high biodegradability while taking into account high heat dissipation performance, high insulation performance and high flame retardant performance.

[0005] Specifically, the present application provides, in a first aspect, a flame-retardant cooling liquid, comprising a base oil and a modifier. The base oil comprises one or more of a silicone oil, a synthetic ester and a natural ester. The modifier is a liquid, and the modifier comprises one or more of a halogenated alkane containing 2-6 carbon atoms, a halogenated alkene containing 2-6 carbon atoms, a halogenated ketone containing 2-6 carbon atoms and a halogenated cycloalkane containing 3-6 carbon atoms.

[0006] The related art develops a coolant with good flame-retardant performance and high electrical insulation by flame-retardant modification of mineral oil. However, mineral oil has poor biodegradability and is difficult to decompose in the natural environment, which cannot meet the demand of the energy storage market for high biodegradability of the coolant. Compared with mineral oil, base oils such as silicone oil, synthetic ester and natural ester have more excellent biodegradability, but their viscosity is high, which leads to insufficient heat dissipation performance, so it is difficult to meet the requirement of high-efficiency heat dissipation of the immersion energy storage cooling system; in addition, the insulation performance of the above-mentioned base oils still needs to be further improved. The present application introduces a specific modifier, at least one of liquid halogenated alkane containing 2-6 carbon atoms, liquid halogenated alkene, liquid halogenated ketone, liquid halogenated cycloalkane containing 3-6 carbon atoms, into the base oil, which effectively reduces the viscosity of the system, improves the heat dissipation performance, and significantly improves the insulation performance of the base oil, while further enhancing its flame retardancy. Thus, the present application takes into account environmental protection and safety while significantly improving the thermal management efficiency of the coolant, which has good application prospect.

[0007] According to some embodiments of the present application, the modifier contains at least 4 halogen atoms.

[0008] According to some embodiments of the present application, the modifier includes one or more of tetrachloroethylene, 1,1,2,2-tetrachloroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, 1,2-dibromo-hexafluoropropane, hexachloroacetone, hexachloropropene, hexachlorobutadiene, 1,4-dibromo-octafluorobutane, 1,2-dibromo-hexafluorocyclobutane, 2,3-dichloro-octafluorobutane, 1,2-dichloro-hexafluorocyclohexane, 1,6-dibromo-perfluorohexane.

[0009] According to some embodiments of the present application, the modifier includes one or more of tetrachloroethylene, 1,1,2,2-tetrachloroethane, 1,2-dibromo-hexafluoropropane, hexachloroacetone, hexachloropropene, hexachlorobutadiene, 1,4-dibromo-octafluorobutane.

[0010] According to some embodiments of the present application, the amount of the base oil is 5-95 parts by weight and the amount of the modifier is 5-95 parts by weight, based on 100 parts by weight of the flame-retardant coolant.

[0011] According to some embodiments of the present application, the amount of the base oil is 20-80 parts by weight and the amount of the modifier is 20-80 parts by weight, based on 100 parts by weight of the flame-retardant coolant.

[0012] According to some embodiments of the present application, the silicone oil comprises at least one of hydrogen-containing silicone oil, dimethyl silicone oil, modified silicone oil; the synthetic ester comprises at least one of polyol ester, diester, phosphate ester; and the natural ester comprises at least one of plant-based ester oil, animal-based ester oil, and natural ester modified oil.

[0013] The second aspect of the present application provides a preparation method of the fire-retardant coolant of the first aspect of the present application, comprising the following steps: mixing the base oil and the modifier to obtain the fire-retardant coolant; wherein the base oil comprises one or more of silicone oil, synthetic ester, and natural ester; the modifier is a liquid, and the modifier comprises one or more of halogenated alkane containing 2-6 carbon atoms, halogenated alkene containing 2-6 carbon atoms, and halogenated ketone containing 2-6 carbon atoms.

[0014] The method of the present application is simple in process and low in production cost, and is suitable for large-scale industrialization and popularization. The fire-retardant coolant prepared by the method of the present application has high biodegradability, and can balance high heat dissipation performance and high insulation performance, and has better safety and environmental protection, and has good application prospect.

[0015] The third aspect of the present application provides an immersed energy storage device comprising the fire-retardant coolant of the first aspect of the present application or the fire-retardant coolant obtained by the method of the second aspect of the present application.

[0016] Since the above-mentioned fire-retardant coolant is used, the immersed energy storage device of the present application has all the advantages of the fire-retardant coolant, which will not be repeated here.

[0017] The fourth aspect of the present application provides a data center comprising the fire-retardant coolant of the first aspect of the present application or the fire-retardant coolant obtained by the method of the second aspect of the present application.

[0018] Since the above-mentioned fire-retardant coolant is used, the data center of the present application has all the advantages of the fire-retardant coolant, which will not be repeated here.

[0019] The fifth aspect of the present application provides an electric equipment comprising the immersed energy storage device of the third aspect of the present application or the data center of the fourth aspect of the present application.

[0020] Since the above-mentioned fire-retardant coolant is used, the electric equipment of the present application has all the advantages of the fire-retardant coolant, which will not be repeated here.

[0021] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, which are exemplary and intended to explain the present application, and cannot be understood as a limitation of the present application.

[0023] In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise specified. The meaning of "a plurality of" is two or more than two. In this text, the term "contains" or "includes" is an open expression, that is, it includes the content indicated by the present application, but does not exclude other aspects.

[0024] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The ranges or values should be construed to include values approximately around the ranges or values. For numerical ranges, the endpoints of the various ranges, the endpoints of the various ranges and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0025] Although mineral oil has good low viscosity and insulation, its biodegradability is poor, and it is difficult to effectively degrade in the natural environment, which may cause potential pollution to soil, water and atmosphere. The biodegradability of silicone oil, synthetic ester and natural ester base oil is good, but there are problems such as high viscosity, poor heat dissipation performance, improved insulation performance, flammable and difficult to meet the requirements of high efficient heat dissipation and high safety of cooling liquid for submerged energy storage system.

[0026] In view of the above limitations, the present application uses high biodegradable insulating oil as base oil, and modifies it to effectively reduce the viscosity of the system, improve the heat dissipation performance, and significantly improve the insulation performance of the base oil, while further enhancing its flame retardancy, so as to realize the multi-effect synergistic optimization of environmental protection, safety and heat dissipation.

[0027] Specifically, the first aspect of the present application provides a flame-retardant cooling liquid, comprising a base oil and a modifier; The base oil comprises one or more of silicone oil, synthetic ester, and natural ester; The modifier is a liquid, and the modifier comprises one or more of halogenated alkane containing 2-6 carbon atoms, halogenated alkene containing 2-6 carbon atoms, halogenated ketone containing 2-6 carbon atoms, and halogenated cycloalkane containing 3-6 carbon atoms.

[0028] The present application uses at least one of liquid halogenated alkanes containing 2-6 carbon atoms, liquid halogenated alkenes, liquid halogenated ketones, liquid halogenated cycloalkanes containing 3-6 carbon atoms as a modifier, which can overcome the problems of large viscosity of base oil, poor heat dissipation performance, to be improved insulation performance and flammable, specifically, the modifier of the present application has small molecular volume, which can be uniformly dispersed in the macromolecular gap of the base oil, break the entanglement and strong interaction between the base oil molecules, reduce the internal friction resistance when the molecules move; in addition, the modifier itself has small viscosity, which can reduce the overall viscosity when added to the base oil, thereby improving the flowability of the flame-retardant coolant, further improving the overall heat dissipation performance by strengthening the convection heat dissipation; in addition, the small molecule halogenated compound can wrap the trace amount of polar impurities (such as carboxylic acid generated by ester hydrolysis) existing in the base oil by physical adsorption, inhibit the ionization into carriers, thereby reducing the conductive path in the system and improving the insulation performance; in addition, the modifier of the present application can release halogen radicals, interrupt combustion, and generate inert gas at the same time, which can isolate oxygen, thereby improving the flame retardant performance of the system.

[0029] In some embodiments, the halogenated alkane contains 2, 3, 4, 5, or 6 carbon atoms.

[0030] In some embodiments, the halogenated alkene contains 2, 3, 4, 5, or 6 carbon atoms.

[0031] In some embodiments, the halogenated alkene can be a mono-olefin, a di-olefin, or a poly-olefin.

[0032] In some embodiments, the halogenated ketone contains 2, 3, 4, 5, or 6 carbon atoms.

[0033] In some embodiments, the halogenated cycloalkane contains 3, 4, 5, or 6 carbon atoms.

[0034] In some embodiments, the modifier contains at least 4 halogen atoms. In this way, the base oil can be better modified, further improving the heat dissipation performance, insulation performance, and flame retardant performance of the base oil, while maintaining high biodegradability.

[0035] In some specific embodiments, the modifier contains 4, 6, 8, or 10 halogen atoms.

[0036] In some embodiments, the halogen atoms include one or more of fluorine, chlorine, bromine, and iodine.

[0037] In some specific embodiments, the halogen atoms include one or more of fluorine, chlorine, and bromine.

[0038] In some embodiments, the halogen atoms include chlorine atoms, or the halogen atoms include fluorine atoms and bromine atoms. In the case where the halogen atoms include fluorine atoms and bromine atoms, the number of bromine atoms is 1 or 2. Thus, the liquid modifier has good compatibility with the base oil, which is conducive to uniform dispersion of the coolant, avoids poor compatibility causing stratification of the system, and further causes poor heat dissipation, insulation, and flame retardation.

[0039] In some embodiments, the modifier includes one or more of a halogenated alkane containing 2-6 carbon atoms, a halogenated alkene containing 2-6 carbon atoms, and a halogenated ketone containing 2-6 carbon atoms.

[0040] In some embodiments, the modifier includes one or more of tetrachloroethylene, 1,1,2,2-tetrachloroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, 1,2-dibromo-hexafluoropropane, hexachloroacetone, hexachloropropene, hexachlorobutadiene, 1,4-dibromo-octafluorobutane, 1,2-dibromo-hexafluorocyclobutane, 2,3-dichloro-octafluorobutane, 1,2-dichloro-hexafluorocyclohexane, and 1,6-dibromo-perfluorohexane. Thus, the base oil can be better modified, and the heat dissipation, insulation, and flame retardation of the base oil are further improved while maintaining high biodegradability.

[0041] In some embodiments, the modifier has a symmetrical molecular structure, so that the molecular polarity is very low (even non-polar), and free charges are not easily generated by ionization, further improving the insulation performance of the coolant.

[0042] In some embodiments, the modifier contains 2-4 carbon atoms, such as 2 carbon atoms, 3 carbon atoms, or 4 carbon atoms. The modifier includes one or more of tetrachloroethylene, 1,1,2,2-tetrachloroethane, 1,2-dibromo-hexafluoropropane, hexachloroacetone, hexachloropropene, hexachlorobutadiene, and 1,4-dibromo-octafluorobutane. The modifier has good compatibility with the base oil, which is conducive to uniform dispersion of the coolant, further improving the heat dissipation, insulation, and flame retardation of the base oil while maintaining high biodegradability. In related technologies, the performance of the base oil, such as the insulation performance, is usually significantly degraded after adding a flame retardant, but adding an appropriate amount of the modifier of the present application does not degrade the insulation performance of the base oil, but rather significantly improves the insulation performance.

[0043] In some embodiments, based on 100 parts by weight of the flame-retardant coolant, the amount of the base oil is 5-95 parts by weight, and the amount of the modifier is 5-95 parts by weight. If the amount of the modifier is too small, the heat dissipation and flame retardation of the base oil are not significantly improved; if the amount of the modifier is too large, the amount of the base oil is too small, causing poor insulation performance of the coolant.

[0044] In some embodiments, the base oil is used in an amount of 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, 70 parts by weight, 75 parts by weight, 80 parts by weight, 85 parts by weight, 90 parts by weight, or 95 parts by weight, based on 100 parts by weight of the fire-retardant coolant.

[0045] In some embodiments, the modifier is used in an amount of 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, 70 parts by weight, 75 parts by weight, 80 parts by weight, 85 parts by weight, 90 parts by weight, or 95 parts by weight, based on 100 parts by weight of the fire-retardant coolant.

[0046] In some embodiments, the base oil is used in an amount of 20 to 80 parts by weight, and the modifier is used in an amount of 20 to 80 parts by weight, based on 100 parts by weight of the fire-retardant coolant. Thereby, the fire-retardant coolant can have high biodegradability, and can also have high heat dissipation performance and high insulation performance, and the like, and the fire-retardant coolant has better comprehensive performance.

[0047] In some embodiments, the silicone oil includes at least one of hydrogen-containing silicone oil, dimethyl silicone oil, and modified silicone oil. As specific examples, the modified silicone oil includes one or more of amino-modified silicone oil, hydroxyl-modified silicone oil, epoxy-modified silicone oil, long-chain alkane-modified silicone oil, olefin-modified silicone oil, fluorinated modified silicone oil, and the like. Thereby, the fire-retardant coolant having good biodegradability can be formed.

[0048] In some embodiments, the synthetic ester includes at least one of polyol ester, diester, and phosphate ester. As specific examples, the polyol ester includes one or more of pentaerythritol oleate, pentaerythritol tetraoctanoate, pentaerythritol tetradecanoate, dipentaerythritol hexa-nonanoate, trimethylolpropane oleate, trimethylolpropane trioctanoate, trimethylolpropane tridecanoate, neopentyl glycol diheptanoate, neopentyl glycol didecanoate, neopentyl glycol dioctanoate, and the like. The diester includes one or more of dibutyl adipate, diisooctyl adipate, diisodecyl adipate, di(2-ethylhexyl) adipate, diisooctyl azelate, diisooctyl sebacate, di(2-ethylhexyl) sebacate, diisooctyl azelate, and the like. The phosphate ester includes one or more of trioxinyl phosphate, tributyl phosphate, tri(2-ethylhexyl) phosphate, cetyl phosphate, glycerol phosphate, and the like. Thereby, the fire-retardant coolant having good biodegradability can be formed.

[0049] In some embodiments, the natural ester includes at least one of a plant-based ester oil, an animal-based ester oil, a natural ester modified oil. As a specific example, the plant-based ester oil includes one or more of soybean oil, rapeseed oil, sunflower seed oil, palm oil, castor oil. The animal-based ester oil includes one or more of ox-tongue oil, beef tallow, lard, etc. The natural ester modified oil includes one or more of rapeseed oil methyl ester, soybean oil methyl ester, palm oil methyl ester, epoxy soybean oil, epoxy linseed oil, beef tallow methyl ester, etc. Thus, a flame-retardant coolant with good biodegradability can be formed.

[0050] The second aspect of the present application provides a preparation method of the flame-retardant coolant of the first aspect of the present application, including the following steps: mixing the base oil and the modifier to obtain the flame-retardant coolant; wherein the base oil includes one or more of silicone oil, synthetic ester, natural ester; the modifier is a liquid, and the modifier includes one or more of halogenated alkane containing 2-6 carbon atoms, halogenated alkene containing 2-6 carbon atoms, halogenated ketone containing 2-6 carbon atoms.

[0051] The method of the present application is simple in process and low in production cost, and is suitable for large-scale industrialization and popularization. The flame-retardant coolant prepared by the method of the present application has high biodegradability, and can balance high heat dissipation performance and high insulation performance, etc., and has better safety and environmental protection, and has good application prospect.

[0052] In some embodiments, the temperature of the mixing can be 40-60℃, for example, 40℃, 45℃, 50℃, 55℃ or 60℃. Optimizing the mixing temperature is conducive to uniformly mixing each component in the flame-retardant coolant to form a homogeneous system, and avoiding performance degradation of the coolant caused by uneven mixing.

[0053] In some embodiments, the mixing time can be 5-12h, for example, 5h, 7h, 9h, 10h or 12h. By limiting the mixing time within the above range, it can be ensured that the base oil and the modifier are mixed sufficiently, and each component has enough time to diffuse in the entire mixing system, which can promote the uniform dissolution of the modifier into the base oil.

[0054] In some embodiments, the mixing is carried out under stirring. The stirring rate can be 600-1000r / min, for example, 600r / min, 700r / min, 800r / min, 900r / min or 1000r / min. The present application does not make special limitation on the mixing method, and other commonly used methods can be used in the present application.

[0055] The third aspect of the present application provides an immersed energy storage device comprising the fire-retardant coolant of the first aspect of the present application or the fire-retardant coolant obtained by the method of the second aspect of the present application.

[0056] The immersed energy storage device of the present application has all the advantages of the fire-retardant coolant, which will not be repeated here.

[0057] In some embodiments, the immersed energy storage device comprises a shell, an energy storage structure arranged in the shell, and the fire-retardant coolant filled in the shell.

[0058] The fourth aspect of the present application provides a data center comprising the fire-retardant coolant of the first aspect of the present application or the fire-retardant coolant obtained by the method of the second aspect of the present application.

[0059] The data center of the present application has all the advantages of the fire-retardant coolant, which will not be repeated here.

[0060] The data center is a physical facility designed for centralized storage, processing and exchange of data, including servers, storage devices, network devices and support systems (such as power supply systems, cooling systems, etc.), and is the core infrastructure of cloud computing and Internet services. The cooling system can include the fire-retardant coolant described above for server cooling.

[0061] The fifth aspect of the present application provides an electrical equipment comprising the immersed energy storage device of the third aspect of the present application or the data center of the fourth aspect of the present application.

[0062] The electrical equipment of the present application has all the advantages of the fire-retardant coolant, which will not be repeated here.

[0063] The schemes of the present application will be explained below in conjunction with examples. Those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. If the specific techniques or conditions are not specified in the examples, they are carried out according to the techniques or conditions described in the literature in the art or according to the product instructions. If the reagents or instruments are not specified by the manufacturer, they are all conventional products that can be obtained by purchase.

[0064] Example 1 This example provides a fire-retardant coolant, which is made by the following method: weighing 60 parts by weight of pentaerythritol oleate and 40 parts by weight of 1,1,2,2-tetrachloroethane, and stirring and mixing at a temperature of 45℃ and a stirring speed of 800r / min for 6h to obtain the fire-retardant coolant.

[0065] The insulation performance and safety performance of the fire-retardant coolant of Example 1 were tested.

[0066] Example 2 The example provides a fire-retardant coolant, which is prepared by the following method: taking 80 parts by weight of pentaerythritol oleate and 20 parts by weight of 1,1,2,2-tetrachloroethane, stirring and mixing at 45°C and 800 r / min for 6h to obtain the fire-retardant coolant.

[0067] The insulation performance and safety performance of the fire-retardant coolant of Example 2 are tested.

[0068] Example 3 The example provides a fire-retardant coolant, which is prepared by the following method: taking 20 parts by weight of pentaerythritol oleate and 80 parts by weight of 1,1,2,2-tetrachloroethane, stirring and mixing at 45°C and 800 r / min for 6h to obtain the fire-retardant coolant.

[0069] The insulation performance and safety performance of the fire-retardant coolant of Example 3 are tested.

[0070] Example 4 The example provides a fire-retardant coolant, which is prepared by the following method: taking 95 parts by weight of pentaerythritol oleate and 5 parts by weight of 1,1,2,2-tetrachloroethane, stirring and mixing at 45°C and 800 r / min for 6h to obtain the fire-retardant coolant.

[0071] The physical and chemical properties and safety performance of the fire-retardant coolant of Example 4 are tested.

[0072] Example 5 The example provides a fire-retardant coolant, which is prepared by the following method: taking 5 parts by weight of pentaerythritol oleate and 95 parts by weight of 1,1,2,2-tetrachloroethane, stirring and mixing at 45°C and 800 r / min for 6h to obtain the fire-retardant coolant.

[0073] The insulation performance and safety performance of the fire-retardant coolant of Example 5 are tested.

[0074] Example 6 The example provides a fire-retardant coolant, which is prepared by the following method: taking 99 parts by weight of pentaerythritol oleate and 1 part by weight of 1,1,2,2-tetrachloroethane, stirring and mixing at 45°C and 800 r / min for 6h to obtain the fire-retardant coolant.

[0075] The insulation performance and safety performance of the fire-retardant coolant of Example 6 are tested.

[0076] Example 7 The embodiment provides a fire-retardant cooling liquid prepared by the following method: taking 1 part by weight of pentaerythritol oleate, 99 parts by weight of 1,1,2,2-tetrachloroethane, stirring and mixing under the condition of 45 DEG C and 800 r / min for 6h to obtain the fire-retardant cooling liquid.

[0077] The insulation performance and safety performance of the fire-retardant cooling liquid of example 7 are tested.

[0078] Example 8 The embodiment provides a fire-retardant cooling liquid prepared by the following method: taking 80 parts by weight of dimethyl silicone oil, 20 parts by weight of tetrachloroethylene, stirring and mixing under the condition of 45 DEG C and 800 r / min for 6h to obtain the fire-retardant cooling liquid.

[0079] The insulation performance and safety performance of the fire-retardant cooling liquid of example 8 are tested.

[0080] Example 9 The embodiment provides a fire-retardant cooling liquid prepared by the following method: taking 60 parts by weight of tricoctyl phosphate, 40 parts by weight of hexachloroacetone, stirring and mixing under the condition of 45 DEG C and 800 r / min for 6h to obtain the fire-retardant cooling liquid.

[0081] The insulation performance and safety performance of the fire-retardant cooling liquid of example 9 are tested.

[0082] Example 10 The embodiment provides a fire-retardant cooling liquid prepared by the following method: taking 40 parts by weight of soybean oil, 60 parts by weight of hexachloropropene, stirring and mixing under the condition of 45 DEG C and 800 r / min for 6h to obtain the fire-retardant cooling liquid.

[0083] The insulation performance and safety performance of the fire-retardant cooling liquid of example 10 are tested.

[0084] Example 11 The embodiment provides a fire-retardant cooling liquid prepared by the following method: taking 60 parts by weight of pentaerythritol oleate, 40 parts by weight of 1,2-dibromohexafluoropropane, stirring and mixing under the condition of 45 DEG C and 800 r / min for 6h to obtain the fire-retardant cooling liquid.

[0085] The insulation performance and safety performance of the fire-retardant cooling liquid of example 11 are tested.

[0086] Example 12 The embodiment provides a fire-retardant cooling liquid prepared by the following method: taking 60 parts by weight of pentaerythritol oleate, 40 parts by weight of hexachlorobutadiene, stirring and mixing under the condition of 45 DEG C and 800 r / min for 6h to obtain the fire-retardant cooling liquid.

[0087] The insulating property and safety property of the fire-retardant coolant of Example 12 were tested.

[0088] Example 13 The fire-retardant coolant of Example 13 was prepared by the following method: 60 parts by weight of pentaerythritol oleate and 40 parts by weight of 1,4-dibromo octafluorobutane were weighed, and stirred and mixed at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the fire-retardant coolant.

[0089] The insulating property and safety property of the fire-retardant coolant of Example 13 were tested.

[0090] Example 14 The fire-retardant coolant of Example 14 was prepared by the following method: 60 parts by weight of pentaerythritol oleate and 40 parts by weight of 1,1,2-trichloroethane were weighed, and stirred and mixed at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the fire-retardant coolant.

[0091] The insulating property and safety property of the fire-retardant coolant of Example 14 were tested.

[0092] Example 15 The fire-retardant coolant of Example 15 was prepared by the following method: 60 parts by weight of pentaerythritol oleate and 40 parts by weight of 1,2-dichlorohexafluorocyclohexane were weighed, and stirred and mixed at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the fire-retardant coolant.

[0093] The insulating property and safety property of the fire-retardant coolant of Example 15 were tested.

[0094] Example 16 The fire-retardant coolant of Example 16 was prepared by the following method: 60 parts by weight of pentaerythritol oleate and 40 parts by weight of 2,3-dichloro octafluorobutane were weighed, and stirred and mixed at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the fire-retardant coolant.

[0095] The insulating property and safety property of the fire-retardant coolant of Example 16 were tested.

[0096] Example 17 The fire-retardant coolant of Example 17 was prepared by the following method: 60 parts by weight of pentaerythritol oleate and 40 parts by weight of 1,2-dibromo hexafluorocyclobutane were weighed, and stirred and mixed at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the fire-retardant coolant.

[0097] The insulating property and safety property of the fire-retardant coolant of Example 17 were tested.

[0098] Comparative Example 1 This comparative example provides a modified cooling liquid, which is made by the following method: taking 60 parts by weight of No. 25 mineral oil, 40 parts by weight of 1,1,2,2-tetrachloroethane, and stirring and mixing at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the modified cooling liquid.

[0099] The insulating property and safety performance of the flame-retardant cooling liquid of Comparative Comparative Example 1 are tested.

[0100] Comparative Example 2 This comparative example provides a flame-retardant cooling liquid, which is made by the following method: taking 60 parts by weight of pentaerythritol oleate, 40 parts by weight of hexachloroethane (solid), and stirring and mixing at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the flame-retardant cooling liquid.

[0101] The insulating property and safety performance of the flame-retardant cooling liquid of Comparative Comparative Example 2 are tested.

[0102] Comparative Example 3 This comparative example provides a flame-retardant cooling liquid, which is made by the following method: taking 60 parts by weight of pentaerythritol oleate, 40 parts by weight of dibromomethane, and stirring and mixing at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the flame-retardant cooling liquid.

[0103] The insulating property and safety performance of the flame-retardant cooling liquid of Comparative Comparative Example 3 are tested.

[0104] Comparative Example 4 This comparative example provides a flame-retardant cooling liquid, which is made by the following method: taking 60 parts by weight of pentaerythritol oleate, 40 parts by weight of chlorinated paraffin-42 (containing 42% of chlorine, which is a halogenated flame retardant with a carbon atom number greater than 6), and stirring and mixing at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the flame-retardant cooling liquid.

[0105] The insulating property and safety performance of the flame-retardant cooling liquid of Comparative Comparative Example 4 are tested.

[0106] Comparative Example 5 This comparative example provides a flame-retardant cooling liquid, which is made by the following method: taking 60 parts by weight of pentaerythritol oleate, 40 parts by weight of ammonium polyphosphate, and stirring and mixing at a temperature of 45°C and a stirring speed of 800 r / min for 6 h to obtain the flame-retardant cooling liquid.

[0107] The insulating property and safety performance of the flame-retardant cooling liquid of Comparative Comparative Example 5 are tested.

[0108] Table 1 below lists the relevant parameters of the above examples and comparative examples.

[0109] Table 1

[0110] Performance test (1) Physicochemical performance test: According to the test methods in GB / T 21801, GB / T 265 and GB / T 507, the biodegradability, kinematic viscosity and breakdown voltage of the prepared fire-retardant cooling liquid in the above examples and comparative examples were tested. The test results are shown in Table 2 below.

[0111] (2) Safety performance test: 5 100% SOC battery cells (rated capacity 45 Ah, working voltage range 2.5-4.2V) were placed in the battery cell holder according to the series arrangement mode, simulating a 5-cell series module, overcharging the middle position battery cell, externally fixed with a clamp, and immersing the module in the cooling liquid. After setting, 1C continuous charging was performed until overcharging triggered thermal runaway, the charging was stopped, and whether the cooling liquid appeared combustion and explosion phenomenon was observed. The test results are shown in Table 2 below.

[0112] Table 2

[0113] Results and discussion: By comparing the above examples and comparative examples, it can be seen that by introducing specific modifiers into the base oil, the system viscosity is effectively reduced, the heat dissipation performance is improved, and the insulation performance of the base oil is significantly improved, while the flame retardancy is further enhanced.

[0114] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means 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 present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0115] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A flame-retardant coolant, characterized in that, Includes base oils and modifiers; The base oil includes one or more of silicone oil, synthetic ester, and natural ester; The modifier is a liquid, and the modifier includes one or more of the following: haloalkanes containing 2-6 carbon atoms, haloolefins containing 2-6 carbon atoms, haloketones containing 2-6 carbon atoms, and halocycloalkanes containing 3-6 carbon atoms.

2. The flame-retardant coolant according to claim 1, characterized in that, The modifier contains at least four halogen atoms.

3. The flame-retardant coolant according to claim 2, characterized in that, The modifier includes one or more of the following: tetrachloroethylene, 1,1,2,2-tetrachloroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, 1,2-dibromohexafluoropropane, hexachloroacetone, hexachloropropylene, hexachlorobutadiene, 1,4-dibromooctafluorobutane, 1,2-dibromohexafluorocyclobutane, 2,3-dichlorooctafluorobutane, 1,2-dichlorohexafluorocyclohexane, and 1,6-dibromoperfluorohexane.

4. The flame-retardant coolant according to claim 3, characterized in that, The modifier includes one or more of tetrachloroethylene, 1,1,2,2-tetrachloroethane, 1,2-dibromohexafluoropropane, hexachloroacetone, hexachloropropylene, hexachlorobutadiene, and 1,4-dibromooctafluorobutane.

5. The flame-retardant coolant according to claim 1, characterized in that, Based on 100 parts by weight of the flame-retardant coolant, the amount of the base oil is 5-95 parts by weight, and the amount of the modifier is 5-95 parts by weight.

6. The flame-retardant coolant according to claim 5, characterized in that, Based on 100 parts by weight of the flame-retardant coolant, the amount of the base oil is 20-80 parts by weight, and the amount of the modifier is 20-80 parts by weight.

7. The flame-retardant coolant according to claim 1, characterized in that, The silicone oil includes at least one of hydrogen-containing silicone oil, dimethyl silicone oil, and modified silicone oil; The synthetic ester includes at least one of polyol esters, diesters, and phosphate esters; The natural esters include at least one of plant-based ester oils, animal-based ester oils, and natural ester-modified oils.

8. A method for preparing a flame-retardant coolant according to any one of claims 1-7, characterized in that, Includes the following steps: The base oil and modifier are mixed to obtain the flame-retardant coolant; The base oil includes one or more of silicone oil, synthetic ester, and natural ester; The modifier is a liquid, and the modifier includes one or more of the following: haloalkanes containing 2-6 carbon atoms, haloolefins containing 2-6 carbon atoms, and haloketones containing 2-6 carbon atoms.

9. A submersible energy storage device, characterized in that, The flame-retardant coolant includes any one of claims 1-7 or the flame-retardant coolant obtained by the method of claim 8.

10. A data center, characterized in that, The flame-retardant coolant includes any one of claims 1-7 or the flame-retardant coolant obtained by the method of claim 8.

11. An electrical appliance, characterized in that, This includes the immersion energy storage device as described in claim 9 or the data center as described in claim 10.

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