Liquid cooling composition as well as preparation method and application thereof

Abstract

The invention provides a liquid cooling composition as well as a preparation method and application thereof. The liquid cooling composition mainly comprises vegetable oil, a pour point depressant, an antioxidant, a passivator, a clearing agent and an emulsifier, preferably further comprises a defoaming agent, and is a safe and environment-friendly high-insulativity liquid chemical. The material has ideal chemical inertness and stability, excellent heat conduction performance, very good electrical insulation performance, extremely low kinematic viscosity and good system compatibility, the preparation method is simple, the raw material cost is low, and the material can be well applied to battery immersion type cooling temperature control and safety protection in various energy storage battery use occasions.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage battery safety, and in particular relates to a liquid cooling composition, a preparation method and application thereof. Background Art

[0002] By the end of 2022, the installed capacity of new energy storage projects in my country has reached 8.7 million kilowatts, of which battery energy storage accounts for about 98%. It is expected that by the end of 2025, the installed capacity of new energy storage will reach more than 30 million kilowatts, with an average annual growth rate of more than 50%. It can be seen that battery energy storage is the most widely used in my country's energy storage system. However, due to the heat generated by the internal chemical reaction of the battery, coupled with changes in ambient temperature and battery aging, the capacity and life of the battery are greatly affected, and the risk of thermal runaway is relatively high.

[0003] At present, the cooling technologies for energy storage batteries mainly include air cooling and cold plate liquid cooling. The cooling medium of air cooling technology is air, and air exchanges heat with energy storage batteries to take away heat. This technology has a simple structure, is easy to maintain, and is easy to install and use, but its cooling efficiency is not high, and it will cause uneven temperature between batteries, which poses a great safety hazard. Cold plate liquid cooling technology uses coolant as a refrigerant to cool the battery through the circulation of coolant. The cold plate is generally installed under the battery cell to cool the contact part between the two. The cooling efficiency of this technology is relatively high and consumes less energy. The above two technologies both indirectly cool the energy storage battery, and have the disadvantages of slow cooling speed and long cooling time. In addition, there are heat pipe cooling technology and phase change material cooling technology. Both technologies are in the laboratory stage and are still far from practical application. In contrast, immersion liquid cooling technology is more mature, and can better solve the problems of cooling efficiency and battery temperature uniformity, while greatly improving the safety performance of energy storage power stations. However, in the prior art, the energy storage battery coolant has the problems of being flammable, explosive, high cost, harmful to the environment, and poor compatibility with electronic equipment, which can easily cause safety accidents. Therefore, a new type of energy storage battery coolant is needed, which can not only ensure the safety of the energy storage battery, but also improve the performance of the energy storage battery. Summary of the invention

[0004] In view of the shortcomings of the energy storage battery coolant in the prior art, the purpose of the present invention is to provide a coolant with high safety and good cooling performance, which helps to improve the performance of the energy storage battery.

[0005] To achieve the above-mentioned object, the first aspect of the present invention provides a liquid cooling composition, the raw materials of which include vegetable oil, pour point depressant, antioxidant, passivator, detergent and emulsifier.

[0006] According to a specific embodiment of the present invention, the raw materials of the liquid cooling composition further include a defoaming agent.

[0007] According to a specific embodiment of the present invention, the total mass of the raw materials of the liquid-cooling composition is 100%, and the raw materials of the liquid-cooling composition include 69 to 87 wt% of the vegetable oil, 2 to 5 wt% of the pour point depressant, 1 to 4 wt% of the antioxidant, 0.8 to 2.5 wt% of the passivator, 0.5 to 3 wt% of the detergent, 8 to 17 wt% of the emulsifier and 0.02 to 0.07 wt% of the defoaming agent.

[0008] According to a preferred embodiment of the present invention, the total mass of the raw materials of the liquid-cooling composition is 100%, and the raw materials of the liquid-cooling composition include 72 to 82 wt% of the vegetable oil, 2.8 to 4.7 wt% of the pour point depressant, 2 to 3.9 wt% of the antioxidant, 0.9 to 1.8 wt% of the passivator, 0.5 to 2 wt% of the detergent, 11 to 16 wt% of the emulsifier and 0.03 to 0.06 wt% of the defoaming agent.

[0009] According to a preferred embodiment of the present invention, the total mass of the raw materials of the liquid-cooling composition is 100%, and the raw materials of the liquid-cooling composition include 72 to 80 wt% of the vegetable oil, 3.9 to 4.6 wt% of the pour point depressant, 2.8 to 3.8 wt% of the antioxidant, 1.03 to 1.58 wt% of the passivator, 0.6 to 2 wt% of the detergent, 11 to 16 wt% of the emulsifier and 0.02 to 0.07 wt% of the defoaming agent.

[0010] According to a more preferred embodiment of the present invention, the total mass of the raw materials of the liquid-cooling composition is 100%, and the raw materials of the liquid-cooling composition include 75 to 78 wt% of the vegetable oil, 3.5 to 4.1 wt% of the pour point depressant, 3.2 to 3.5 wt% of the antioxidant, 1.05 to 1.07 wt% of the passivator, 0.7 to 1.4 wt% of the detergent, 12 to 15 wt% of the emulsifier and 0.03 to 0.06 wt% of the defoaming agent.

[0011] According to a specific embodiment of the present invention, the vegetable oil is a genetically modified vegetable oil (such as genetically modified soybean oil) and / or a hydrogenated refined vegetable oil (such as at least one of refined olive oil, refined canola oil and refined peanut oil).

[0012] According to a specific embodiment of the present invention, the antioxidant is a mixture of a phenolic antioxidant, an amine antioxidant and a phosphite antioxidant;

[0013] Preferably, the antioxidant is a mixture of 2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate;

[0014] Preferably, the mass ratio of the 2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate is 1:1:0.3.

[0015] According to a specific embodiment of the present invention, the detergent is selected from at least one of stearic acid monoethanolamide phosphate, oleic acid monoethanolamide phosphate, oleic acid cyclohexyl ester, stearic acid cyclohexyl ester, ammonium sulfamate and magnesium sulfamate;

[0016] Preferably, the base value of the detergent is 450 to 600 mgKOH / g;

[0017] Preferably, the detergent is selected from one of magnesium sulfamate, ammonium sulfamate, cyclohexyl stearate and oleic acid monoethanolamide phosphate.

[0018] According to a specific embodiment of the present invention, the pour point depressant is selected from at least one of methyl dimethacrylate, alkyl naphthalene (such as T801), polymethacrylate (such as V465) and poly-α-olefin (such as T803B); and / or

[0019] The passivating agent is selected from benzotriazole derivatives and / or thiadiazole derivatives; and / or

[0020] The emulsifier is selected from at least one of fatty acid methyl ester ethoxylate (e.g., FMEE), fatty acid glyceride (e.g., citric acid glyceride, lactic acid glyceride), and polyethylene glycol (e.g., polyethylene glycol having a molecular weight of 400 to 2000);

[0021] Preferably, the pour point depressant is selected from any one of methyl dimethacrylate, alkyl naphthalene and polymethacrylate; and / or

[0022] The passivating agent is methylbenzotriazole or a thiadiazole derivative (such as T561).

[0023] In the present invention, T801 refers to an alkylnaphthalene pour point depressant purchased from Wuhan Jiyesheng Chemical Co., Ltd.; V465 refers to a polymethacrylate type lubricating oil pour point depressant purchased from Shanghai Yerun Chemical Co., Ltd.; T803B refers to a poly-α-olefin pour point depressant purchased from Shanghai Minglan Chemical Co., Ltd.; FMEE refers to a fatty acid methyl ester ethoxylate purchased from Guangzhou Taili Chemical Co., Ltd.; T561 refers to a thiadiazole derivative, the chemical name of which is 2,5-di(tert-dodecyl disulfide)-1,3,4-thiadiazole, purchased from Hubei Watson Chemical Technology Co., Ltd.

[0024] According to a specific embodiment of the present invention, the defoamer is selected from at least one of a silicone defoamer, an ester defoamer and an ether defoamer;

[0025] Preferably, the defoaming agent is silicone oil or a polyether defoaming agent (eg THIX-288, B-299).

[0026] In the present invention, THIX-288 refers to a polyether defoamer purchased from Yantai Hengxin Chemical Technology Co., Ltd.; B-299 refers to a polyether defoamer purchased from Guangdong Zhonglianban Fine Chemical Co., Ltd.

[0027] The second aspect of the present invention provides a method for preparing the liquid cooling composition according to the first aspect of the present invention, comprising the following steps:

[0028] The vegetable oil, pour point depressant, antioxidant, passivator, detergent and emulsifier are mixed to obtain the liquid cooling composition.

[0029] According to a specific embodiment of the present invention, the defoaming agent is further added to the liquid cooling composition; and / or

[0030] The mixing temperature is 25 to 50°C; and / or

[0031] Mixing by stirring; and / or the stirring time is 0.2 to 5 hours;

[0032] Preferably, the stirring time is 1 to 3 hours.

[0033] According to a specific embodiment of the present invention, the liquid-cooling composition is purified in the following manner:

[0034] The liquid-cooled composition is filtered, and the filtrate is collected and dehydrated to obtain the purified liquid-cooled composition.

[0035] According to a specific embodiment of the present invention, the filtering method is any one of platen filtration, screen filtration, vacuum screen filtration and coalescence filtration; and / or

[0036] The dehydration method is any one of gravity sedimentation dehydration, nitrogen blowing dehydration, centrifugal separation dehydration, membrane separation dehydration and water absorption filter dehydration.

[0037] Application of the liquid cooling composition according to the first aspect of the present invention or the liquid cooling composition prepared by the method according to the second aspect of the present invention in liquid cooling technology for energy storage batteries.

[0038] Beneficial effects of the present invention:

[0039] In view of the problems of flammability, explosion, high cost, environmental damage, poor compatibility with electronic equipment, etc. in the energy storage battery coolant in the prior art, the present invention provides a liquid cooling composition, a preparation method and application thereof. The liquid cooling composition mainly includes vegetable oil, pour point depressant, antioxidant, passivator, detergent and emulsifier, and preferably also includes a defoaming agent.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] (1) The liquid cooling composition uses refined vegetable oil or genetically modified vegetable oil as base oil, has a dielectric strength of 32 to 37 kV / mm, an acid value of 0.0002 to 0.0003 wt%, a copper corrosion grade of 1b, a liquid phase corrosion (A method) result of no rust, and has good insulation and low corrosion;

[0042] (2) By designing the antioxidant formula, the oxidation of the liquid cooling composition is effectively delayed, so that the liquid cooling composition has good oxidation stability, and the rotating oxygen bomb is 1650 to 1770 minutes;

[0043] (3) In the liquid cooling composition, the dialkyl dithiophosphate zinc in the detergent and the oxidant synergistically enhances the effect, can eliminate the heat exchange stratosphere on the surface of the battery cell at the mesoscale, increase the contact frequency between the battery cell and the "fresh" immersion coolant, and is conducive to quickly taking away the heat of the battery cell. The specific heat (25°C) is 2.4 to 2.7 kJ / (kg·K), and the thermal conductivity (25°C) is 0.26 to 0.29 W / (m·K), which ensures a good cooling temperature control effect and safety protection function; at the same time, the detergent added to the liquid cooling composition can also neutralize the acid value brought by the emulsifier, ensuring the physical performance indicators of the liquid cooling composition;

[0044] (4) The kinematic viscosity of the liquid cooling composition at 40°C is 10 to 15 mm 2 / s, wherein the addition of the emulsifier greatly improves the fluidity of the vegetable oil, increases the heat exchange efficiency of the coolant, and reduces the flow resistance of the liquid cooling composition, which is beneficial to saving cycle energy consumption;

[0045] (5) The 1000h ECI index mass change and 1000h ECI index volume change of the liquid cooling composition are 3.4% to 4.2% and 2.8% to 4.1%, respectively, and have good system compatibility;

[0046] (6) The boiling point of the liquid cooling composition is 210 to 350°C, and it has good high temperature adaptability, and is suitable for application in high temperature application environments of energy storage batteries;

[0047] (7) The raw material cost of the liquid cooling composition is 57% of the prior art, and the raw material cost is low;

[0048] (8) The preparation method of the liquid cooling composition is simple and has low requirements on the production process;

[0049] In summary, the liquid cooling composition provided by the present invention is a safe, environmentally friendly, highly insulating liquid chemical with ideal chemical inertness and stability, excellent thermal conductivity, very good electrical insulation performance, extremely low kinematic viscosity, good system compatibility, and a simple preparation method with low raw material cost. It can be well applied to battery immersion cooling temperature control and safety protection in various energy storage battery use occasions. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with examples, but the examples of the present invention are only exemplary descriptions, and the implementation methods do not constitute limitations of the present invention under any circumstances.

[0051] The raw material information of the embodiments and comparative examples is as follows:

[0052] Refined olive oil: purchased from Jishui County Hongxing Natural Medicinal Spice Oil Factory;

[0053] Refined canola oil: purchased from Hubei Xinyuhong Biopharmaceutical Technology Co., Ltd.;

[0054] Refined peanut oil: purchased from Shanghai Linchen Pharmaceutical Technology Co., Ltd.;

[0055] Genetically modified soybean oil: purchased from Hubei Handafei Biotechnology Co., Ltd.;

[0056] FMEE: fatty acid methyl ester ethoxylate, purchased from Guangzhou Taili Chemical Co., Ltd.;

[0057] V465: a polymethacrylate type lubricating oil pour point depressant, purchased from Shanghai Yerun Chemical Co., Ltd.;

[0058] THIX-288: a polyether defoamer, purchased from Yantai Hengxin Chemical Technology Co., Ltd.;

[0059] T801: an alkyl naphthalene pour point depressant, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0060] T561: a thiadiazole derivative, chemical name 2,5-di(tert-dodecyl disulfide)-1,3,4-thiadiazole, purchased from Hubei Watson Chemical Technology Co., Ltd.;

[0061] T106B: high base calcium sulfonate (base value 306 mgKOH / g), purchased from Wuxi Nanfang Additive Co., Ltd.;

[0062] The oxidant used in Examples 1 to 6 and Comparative Examples 1, 2, 4 and 5 is a mixture of 2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate in a mass ratio of 1:1:0.3.

[0063] The room temperature below refers to 25°C.

[0064] Example 1

[0065] 1) Add 76 g of refined olive oil to a stirred tank, set the temperature to 40°C, add 3.9 g of methyl dimethacrylate, 3.2 g of antioxidant and 1.05 g of methylbenzotriazole while stirring, and stir for 1.5 h until the mixture is uniformly mixed;

[0066] 2) Continue to add 0.05 g silicone oil, 0.8 g magnesium sulfamate (base value 510 mgKOH / g) and 15 g emulsifier (i.e. FMEE) to the stirred tank in step 1), stir for 0.5 h until the mixture is uniformly mixed, let stand, and cool to room temperature to obtain a liquid-cooled composition;

[0067] 3) Purification of the liquid-cooling composition: The liquid-cooling composition obtained in step 2) is filtered by a screen filtration method, the filtrate is collected, and the filtrate is dehydrated by a centrifugal separation technique, and the obtained supernatant is the purified liquid-cooling composition.

[0068] Example 2

[0069] 1) Add 77 g of refined canola oil to a stirred tank, set the temperature to 35°C, add 4.1 g of pour point depressant (i.e., V465), 3.4 g of antioxidant and 1.06 g of methylbenzotriazole while stirring, and stir for 1 h until the mixture is uniformly mixed;

[0070] 2) Continue to add 0.04 g silicone oil, 1 g magnesium sulfamate (base value 510 mgKOH / g) and 13.4 g emulsifier (i.e. FMEE) to the stirred tank in step 1), stir for 1 h until the mixture is uniformly mixed, let stand, and cool to room temperature to obtain a liquid-cooled composition;

[0071] 3) Purification of the liquid-cooling composition: The liquid-cooling composition obtained in step 2) is filtered by a platen filtration method, the filtrate is collected, and the filtrate is dehydrated by a centrifugal separation technique, and the obtained supernatant is the purified liquid-cooling composition.

[0072] Example 3

[0073] 1) Add 75g of refined peanut oil to a stirred tank, set the temperature to 40°C, add 4g of methyl dimethacrylate, 3.5g of antioxidant and 1.05g of methylbenzotriazole while stirring, and stir for 2h until the mixture is uniformly mixed;

[0074] 2) Continue to add 0.05 g of polyether defoamer (i.e., THIX-288), 1.4 g of cyclohexyl stearate (base value 480 mgKOH / g), and 15 g of citric acid glyceride to the stirred tank in step 1), stir for 0.5 h until the mixture is uniform, let stand, and cool to room temperature to obtain a liquid-cooled composition;

[0075] 3) Purification of the liquid-cooling composition: The liquid-cooling composition obtained in step 2) is filtered by a screen filtration method, the filtrate is collected, and the filtrate is dehydrated by a membrane separation technology, and the obtained supernatant is the purified liquid-cooling composition.

[0076] Example 4

[0077] 1) Add 76g of genetically modified soybean oil to a stirred tank, set the temperature to 30°C, add 4g of pour point depressant (i.e., T801), 3.3g of antioxidant and 1.07g of passivator (i.e., T561) while stirring, and stir for 2h until the mixture is evenly mixed;

[0078] 2) Continue to add 0.03 g of silicone oil, 0.9 g of oleic acid monoethanolamide phosphate (base value 504 mgKOH / g) and 14.7 g of citric acid glyceride to the stirred tank in step 1), stir for 1 hour until the mixture is uniform, let stand, and cool to room temperature to obtain a liquid-cooled composition;

[0079] 3) Purification of the liquid-cooling composition: The liquid-cooling composition obtained in step 2) is filtered by vacuum filtration, the filtrate is collected, and the filtrate is dehydrated by centrifugal separation technology. The obtained supernatant is the purified liquid-cooling composition.

[0080] Example 5

[0081] 1) Add 72 g of refined olive oil to a stirred tank, set the temperature to 40°C, add 4.6 g of methyl dimethacrylate, 3.8 g of antioxidant and 1.58 g of methylbenzotriazole while stirring, and stir for 1.5 h until the mixture is uniformly mixed;

[0082] 2) Continue to add 0.02 g of silicone oil, 2 g of ammonium sulfamate (base value 531 mgKOH / g) and 16 g of emulsifier (i.e., FMEE) to the stirred tank in step 1), stir for 0.5 h until the mixture is uniformly mixed, let stand, and cool to room temperature to obtain a liquid-cooled composition;

[0083] 3) Purification of the liquid-cooling composition: The liquid-cooling composition obtained in step 2) is filtered by a screen filtration method, the filtrate is collected, and the filtrate is dehydrated by a centrifugal separation technique to obtain a purified liquid-cooling composition.

[0084] Example 6

[0085] 1) Add 80 g of refined olive oil to a stirred tank, set the temperature to 25°C, add 4.5 g of methyl dimethacrylate, 2.8 g of antioxidant and 1.03 g of methylbenzotriazole while stirring, and stir for 3 h until the mixture is uniformly mixed;

[0086] 2) Continue to add 0.07 g of silicone oil, 0.6 g of magnesium sulfamate (base value 510 mgKOH / g) and 11 g of lactic acid glyceride to the stirred tank in step 1), stir for 2 h until the mixture is uniform, let stand, and cool to room temperature to obtain a liquid-cooled composition;

[0087] 3) Purification of the liquid-cooling composition: The liquid-cooling composition obtained in step 2) is filtered by a screen filtration method, the filtrate is collected, and the filtrate is dehydrated by a centrifugal separation technique to obtain a purified liquid-cooling composition.

[0088] Test Example 1

[0089] According to the test methods specified in the standards, multiple performance indicators of the purified liquid cooling compositions prepared in Examples 1 to 6 were measured.

[0090] The index names, measurement results and standards are detailed in Table 1.

[0091] Table 1. Performance indicators and test methods of the purified liquid cooling composition

[0092]

[0093]

[0094] As can be seen from Table 1, the properties of the liquid cooling compositions prepared in Examples 1 to 6 are as follows: (1) The kinematic viscosity at 40°C is between 10 and 15 mm 2 / s, the lower kinematic viscosity makes the liquid cooling composition have good fluidity, which is beneficial to the improvement of heat dissipation efficiency; (2) the acid value is between 0.0002 and 0.0003wt%; the copper corrosion grade at 100℃ and 3h is 1b; the results of the A method liquid phase corrosion test are all rust-free; the mass change of the ECI index at 1000h and the volume change of the ECI mass index at 1000h are both below 4.5%; the rotating oxygen bomb is below 1800min, and the lower acid value, copper corrosion, liquid phase corrosion, ECI index change and rotating oxygen bomb indicate that the liquid cooling composition has low corrosiveness and oxidizing properties to the energy storage battery; (3) the thermal conductivity at 25℃ is 2.45 to 2.64W / (m·K), and the higher thermal conductivity indicates that the liquid cooling composition has a strong heat dissipation capacity; (4) the dielectric strength is 32.2 to 36.6kV / mm, indicating that the liquid cooling composition has good insulation properties. The test results of the above indicators indicate that the liquid cooling composition provided by the present invention is suitable for battery immersion cooling temperature control and safety protection in various energy storage battery usage scenarios.

[0095] Comparative Example 1

[0096] The refined olive oil used in Example 1 was replaced with unrefined olive oil of equal mass, and the other raw materials and the preparation and purification steps of the liquid-cooling composition were the same as in Example 1.

[0097] Comparative Example 2

[0098] The genetically modified soybean oil used in Example 4 was replaced with non-genetically modified soybean oil of equal mass, and the other raw materials and the preparation and purification steps of the liquid-cooled composition were the same as those in Example 4.

[0099] Test Example 2

[0100] The acid value, dielectric strength, copper corrosion, liquid phase corrosion and rotating oxygen bomb of the liquid cooling compositions prepared in Example 1, Example 4, Comparative Example 1 and Comparative Example 2 were measured.

[0101] The specific results and the standards for measuring each technical parameter are shown in Table 2.

[0102] Table 2. Comparison of the performance of liquid cooling compositions of Comparative Example 1 and Example 1, Comparative Example 2 and Example 4

[0103]

[0104]

[0105] Based on the data in Table 2, by comparing Example 1 with Comparative Example 1, it can be seen that: the dielectric strength of the liquid-cooling composition prepared in Example 1 is increased by 34.6% compared with the dielectric strength of the liquid-cooling composition prepared in Comparative Example 1; the copper corrosion grade of the liquid-cooling composition prepared in Example 1 is 1b (the polished copper sheet is slightly discolored), and the liquid phase corrosion measurement result is no rust; the copper corrosion grade of the liquid-cooling composition prepared in Comparative Example 1 is 2b (the polished copper sheet is moderately discolored), and the liquid phase corrosion measurement result is slight rust. It is explained that the present invention uses hydrorefined vegetable oil to prepare the liquid cooling composition, which overcomes the defects of natural vegetable oil, improves the insulation performance of the liquid cooling composition, and reduces its corrosiveness; by comparing Example 4 with Comparative Example 2, it can be seen that the dielectric strength of the liquid cooling composition prepared in Example 4 is 28.2% higher than that of the liquid cooling composition prepared in Comparative Example 2; the copper corrosion grade of the liquid cooling composition prepared in Example 4 is 1b (polished copper sheet slightly discolored), and the liquid phase rust measurement result is no rust; the copper corrosion grade of the liquid cooling composition prepared in Comparative Example 2 is 2b (polished copper sheet moderately discolored), and the liquid phase rust measurement result is slight rust. It is explained that the present invention uses transgenic vegetable oil to prepare the liquid cooling composition, which overcomes the defects of natural vegetable oil, improves the insulation performance of the liquid cooling composition, and reduces its corrosiveness.

[0106] Comparative Example 3

[0107] The mass ratio of "2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate" in the antioxidant used in Example 1 was adjusted to 1:0.8:0.5, and the preparation and purification steps of other raw materials and liquid cooling composition were the same as in Example 1.

[0108] Test Example 3

[0109] According to the method specified in the standard SH / T 0193-2022, the liquid-cooling compositions prepared in Example 1 and Comparative Example 3 were subjected to a rotating oxygen bomb test. The experimental results and the comparison of the antioxidant formulas in the liquid-cooling compositions prepared in Example 1 and Comparative Example 3 are shown in Table 3.

[0110] Table 3. Comparison of the results of Example 1 and Comparative Example 3 liquid-cooled composition rotary oxygen bomb

[0111] Antioxidants Example 1 Comparative Example 3 2. 6-di-tert-butyl-p-cresol: octyl diphenylamine: zinc dialkyl dithiophosphate (mass ratio) 1:1:0.3 1:0.8:0.5 project Example 1 Comparative Example 3 Rotating oxygen bomb, min 1734 1026

[0112] From the results in Table 3, it can be seen that the mass ratio of 2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate in the antioxidant used in the liquid cooling composition provided by the present invention affects the oxidation stability (or antioxidant property) of the liquid cooling composition. The antioxidant formula provided by the present invention helps to improve the antioxidant property of the liquid cooling composition, extend the service life of the liquid cooling composition, and thus save costs.

[0113] Comparative Example 4

[0114] The detergent magnesium sulfamate used in Example 1 was replaced with an equal mass of T106B (a high basicity calcium sulfonate with a basicity of 306 mgKOH / g). Other raw materials and the preparation and purification steps of the liquid cooling composition were the same as those in Example 1.

[0115] Comparative Example 5

[0116] The detergent magnesium sulfamate used in Example 1 was removed, and the other raw materials and the preparation and purification steps of the liquid cooling composition were the same as those in Example 1.

[0117] Comparative Example 6

[0118] The mass ratio of "2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate" in the antioxidant used in Example 1 was adjusted to 1:1:0, that is, the zinc dialkyl dithiophosphate component was not added, and the other raw materials and liquid cooling composition preparation and purification steps were the same as in Example 1.

[0119] Test Example 4

[0120] The acid value and thermal conductivity of the liquid cooling compositions prepared in Comparative Example 4, Comparative Example 5, Comparative Example 6 and Example 1 were measured. The results are shown in Table 4.

[0121] Table 4. Performance comparison of Comparative Example 5, Comparative Example 6, and Example 1

[0122]

[0123] Table 4 shows that if a detergent outside the scope of the present invention is added to the liquid cooling composition (Comparative Example 4) or no detergent is added (Comparative Example 5), the acid value of the obtained composition is significantly improved, thereby enhancing the corrosiveness of the liquid cooling composition; if a detergent outside the scope of the present invention is used in the liquid cooling composition (Comparative Example 4), the detergent is removed (Comparative Example 5) or the dialkyl dithiophosphate zinc in the oxidant (Comparative Example 6), the synergistic effect between the detergent within the scope of the present invention and the dialkyl dithiophosphate zinc is destroyed, so that the thermal conductivity of the liquid cooling composition is reduced.

[0124] Comparative Example 7

[0125] This comparative example provides a battery immersion heat dissipation coolant, which is composed of the following weight ratio:

[0126] 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (HFE-347, CAS No. 406-78-0): 55 parts;

[0127] 1,1-Dichloroethane: 42 parts;

[0128] Methanol: 2 parts;

[0129] Phenol: 0.05 parts;

[0130] Benzotriazole: 0.1 part;

[0131] Nano titanium dioxide: 0.02 parts;

[0132] Nano-alumina: 0.03 parts.

[0133] Test Example 5

[0134] The 40°C kinematic viscosity, dielectric strength, boiling point, specific heat and thermal conductivity of the liquid cooling composition provided in Example 1 and the battery immersion coolant provided in Comparative Example 7 were measured, and the raw material costs of the liquid cooling composition prepared in Example 1 and the battery immersion coolant provided in Comparative Example 7 were calculated.

[0135] The standards and test results of the test methods for each index, the liquid cooling composition and the raw material cost of the battery immersion coolant are detailed in Table 5.

[0136] Table 5. Comparison of performance indicators and raw material costs between Comparative Example 7 and Example 1

[0137] project Example 1 Comparative Example 7 Test Method <![CDATA[Kinematic viscosity at 40 °C, mm 2 / s]]> 11 17 GB / T265-1999 Dielectric strength, kV / mm 36.6 36.5 GB / T507-2002 Boiling point, °C 230 50-60 GB / T616-2006 Specific heat (25℃), kJ / (kg·K) 2.50 1.32 NB / SH / T0632-2014 Thermal conductivity (25℃), W / (m·K) 0.281 0.523 ASTME1530-19 Raw material cost, yuan / ton 5460 9540 -

[0138] Table 5 shows that in terms of fluidity, the 40°C kinematic viscosity of the liquid cooling composition prepared in Example 1 is 11 mm 2 / s, which is 35.3% lower than the coolant provided in Comparative Example 7, and has better fluidity; in terms of insulation performance: the dielectric strength of the liquid-cooling composition prepared in Example 1 is 36.3 kV / mm, which is almost equal to the dielectric strength of the coolant provided in Comparative Example 7, and the liquid-cooling composition has sufficient insulation performance; in terms of high temperature adaptability, the boiling point of the liquid-cooling composition prepared in Example 1 is 230°C, which is 3.8 to 4.6 times the boiling point of the coolant provided in Comparative Example 7; the specific heat of the liquid-cooling composition is 1.9 times that of the coolant, and the higher boiling point and higher specific heat make the liquid-cooling composition prepared in Example 1 more suitable for the high-temperature application environment of the energy storage battery than the coolant provided in Comparative Example 7; in terms of thermal conductivity, although the thermal conductivity of the liquid-cooling composition prepared in Example 1 is lower than that of the coolant provided in Comparative Example 7, it is still 0.281, which is sufficient to meet the cooling needs of the energy storage battery; in terms of cost, the cost of the raw materials used in the preparation of the liquid-cooling composition in Example 1 is only 57% of the cost of the raw materials used in the preparation of the same quality coolant in Comparative Example 7. Compared with the prior art, the liquid cooling composition provided by the present invention has an outstanding advantage in terms of cost and is more suitable for promotion and use in energy storage battery immersion liquid cooling technology.

[0139] Although the present invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that various changes may be made without departing from the true spirit and scope of the present invention. In addition, the subject matter, spirit and scope of the present invention may be varied to accommodate specific situations, materials, material combinations and methods. All of these changes are included within the scope of the claims of the present invention.

Claims

1. A liquid cooling composition, the raw materials of which include vegetable oil, pour point depressant, antioxidant, passivator, detergent and emulsifier.

2. The liquid cooling composition according to claim 1, characterized in that The raw materials of the liquid cooling composition also include a defoaming agent.

3. The liquid cooling composition according to claim 2, characterized in that Taking the total mass of the raw materials of the liquid cooling composition as 100%, the raw materials of the liquid cooling composition include 69 to 87 wt % of the vegetable oil, 2 to 5 wt % of the pour point depressant, 1 to 4 wt % of the antioxidant, 0.8 to 2.5 wt % of the passivator, 0.5 to 3 wt % of the detergent, 8 to 17 wt % of the emulsifier and 0.02 to 0.07 wt % of the defoaming agent.

4. The liquid cooling composition according to any one of claims 1 to 3, characterized in that The vegetable oil is genetically modified vegetable oil and / or hydrogenated refined vegetable oil.

5. The liquid cooling composition according to any one of claims 1 to 4, characterized in that The antioxidant is a mixture of phenolic antioxidants, amine antioxidants and phosphite antioxidants; Preferably, the antioxidant is a mixture of 2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate; Preferably, the mass ratio of the 2,6-di-tert-butyl-p-cresol, octyl diphenylamine and zinc dialkyl dithiophosphate is 1:1:0.

3.

6. The liquid cooling composition according to any one of claims 1 to 5, characterized in that The detergent is selected from at least one of stearic acid monoethanolamide phosphate, oleic acid monoethanolamide phosphate, oleic acid cyclohexyl ester, stearic acid cyclohexyl ester, ammonium sulfamate and magnesium sulfamate.

7. The liquid cooling composition according to any one of claims 1 to 6, characterized in that The pour point depressant is selected from at least one of methyl dimethacrylate, alkyl naphthalene, polymethacrylate and poly-α-olefin; and / or The passivating agent is selected from benzotriazole derivatives and / or thiadiazole derivatives; and / or The emulsifier is selected from at least one of fatty acid methyl ester ethoxylate, fatty acid glyceride and polyethylene glycol.

8. The liquid cooling composition according to claim 2 or 3, characterized in that: The defoaming agent is selected from at least one of silicone defoaming agents, ester defoaming agents and ether defoaming agents.

9. A method for preparing a liquid cooling composition as claimed in any one of claims 1 to 8, comprising the following steps: The vegetable oil, pour point depressant, antioxidant, passivator, detergent and emulsifier are mixed to obtain the liquid cooling composition.

10. The method according to claim 9, characterized in that The defoaming agent is also added to the liquid cooling composition; and / or The mixing temperature is 25 to 50°C.

11. Use of the liquid cooling composition according to any one of claims 1 to 8 or the liquid cooling composition prepared by the method according to claim 9 or 10 in liquid cooling technology for energy storage batteries.

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