Vegetable-based insulating oil-based immersion coolant for electronic components and devices

Abstract

To provide a vegetable-based insulating oil immersion cooling liquid for electronic component and device that effectively reduce the viscosity of vegetable-based insulating oil and improve its fluidity.SOLUTION: The vegetable-based insulating oil immersion cooling liquid for electronic component and device includes a base oil including vegetable-based insulating oil and a viscosity reduction additive that includes one or more combinations of a polyorganosiloxane compound, a silicon-based phosphate compound, and a silicon-based phosphite compound and has a viscosity of 0.02 mm2 / s to 1.05 mm2 / s.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present application relates to the field of liquid cooling technology for electronic components and devices, and in particular to vegetable insulating oil-based immersion cooling fluids for electronic components and devices. [Background technology]

[0002] Electronic components and devices are a general term for electronic components and devices, and can include resistors, capacitors, inductors, semiconductor isolation devices, electroacoustic devices, laser devices, optoelectronic devices, sensors, power supplies, integrated circuits, CPUs, printed circuit boards, etc.

[0003] With the development of IT technology, heat dissipation is becoming increasingly important for electronic components and devices such as CPUs, motherboards, memory sticks, hard disks, power supplies, and printed circuit boards. In particular, the current market share of lithium-ion batteries is constantly increasing, making it extremely important to improve the lifespan and safety of lithium-ion battery energy storage systems. Lithium-ion battery energy storage systems have high power and heat output, but the dense battery arrangement and limited heat dissipation space make it difficult to dissipate heat quickly and evenly. This can easily lead to heat accumulation within the battery pack and excessive operating temperatures, thereby reducing the battery life and safety.

[0004] Compared to air cooling, liquid cooling, especially immersion liquid cooling, has the advantages of large heat transfer capacity, low flow resistance, and high heat exchange efficiency, making it widely used in the heat dissipation technology field of electronic components and devices. For example, conventional vegetable insulating oil, with its excellent heat transfer efficiency, insulating properties, high ignition and flash points, and high biodegradability (over 95%), is primarily used for liquid cooling of high-voltage equipment such as oil-immersed transformers. However, its use in lithium-ion battery energy storage systems is limited, primarily due to the fact that its main component is triglyceride, which is prone to hydrolysis and deteriorates its insulating performance. Therefore, developing a stable immersion coolant suitable for lithium-ion battery energy storage systems is particularly important. Summary of the Invention [Problem to be solved by the invention]

[0005] Based on this, it is necessary to provide a vegetable insulating oil-based immersion coolant for electronic components and devices to solve the problems of vegetable insulating oil in the prior art, which has high viscosity, poor fluidity, and is prone to hydrolysis, thereby making it unsuitable for application in lithium-ion battery energy storage systems. [Means for solving the problem]

[0006] The present application relates to a vegetable insulating oil-based immersion coolant for electronic components and devices, which contains a base oil including vegetable insulating oil and one or more combinations of a polyorganosiloxane-based compound, a silicon phosphate-based compound, and a silicon phosphite-based compound, and has a viscosity of 0.02 mm. 2 / s~1.05mm 2 and a viscosity reducing additive, wherein the additive is hydroxybenzoates.

[0007] In a possible embodiment, the vegetable insulating oil comprises a combination of one or more of FR3 vegetable insulating oil, NP vegetable insulating oil, RDB vegetable insulating oil, VinsOil vegetable insulating oil, BIOTEMP vegetable insulating oil, MIDEL vegetable oil, and PFAE vegetable insulating oil.

[0008] In a possible embodiment, the polyorganosiloxane-based compound comprises one or more combinations of dimethyldimethoxysilane, methyltrimethoxysilane, dimethylsiloxane, low-polymerized dimethylsiloxane, trimethylsilane, trimethoxysilane, pentamethyldisiloxane, and methoxytriethyleneoxypropyltrimethoxysilane; and / or The silicon-based phosphate compound includes one or a combination of two of tris(trimethylsilyl)phosphate and bis(trimethylsilylated vinyl phosphate); and / or The silicon-based phosphite-based compound includes one or more combinations of mono(trimethylsilyl)phosphite, tris(trimethylsilyl)phosphite, and diethyltrimethylsilylphosphite.

[0009] In a possible embodiment, the immersion cooling liquid further comprises an inorganic thermally conductive filler that is an insulating filler.

[0010] In a possible embodiment, the inorganic thermally conductive filler comprises a combination of at least one of boron nitride, aluminum nitride, silicon nitride, silicon oxide, aluminum oxide, zinc oxide, and magnesium oxide.

[0011] In a possible embodiment, in the immersion coolant, the weight percentage of the base oil is 50% to 90%, the weight percentage of the decane-based additive is 10% to 50%, and the weight percentage of the inorganic thermally conductive filler is 1% to 10%.

[0012] In a possible embodiment, the electronic component / device is a lithium ion battery.

[0013] In a possible embodiment, the immersion cooling liquid is prepared by mixing and stirring the components contained therein.

[0014] In a possible embodiment, the stirring time is between 2 hours and 5 hours. [Effects of the Invention]

[0015] The beneficial effects of vegetable insulating oil-based immersion coolants for the above electronic components and devices are as follows: By adding one or a combination of polyorganosiloxane compounds, silicon phosphate compounds, and silicon phosphite compounds to vegetable insulating oil, the viscosity of these viscosity reducing additives can be reduced to 0.02 mm. 2 / s~1.05mm 2 / s, these viscosity-reducing additives can effectively reduce the viscosity of vegetable insulating oil and improve its fluidity, thereby improving the heat transfer and heat conduction effects of the immersion coolant. Meanwhile, these viscosity-reducing additives contain siloxane bonds, which can remove moisture from the immersion coolant, thereby improving the stability of the immersion coolant and reducing problems such as hydrolysis of the vegetable insulating oil and deterioration of its insulating performance. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to more clearly understand the above-mentioned objects, features, and advantages of the present application, specific embodiments of the present application will be described in detail below. In the following description, many specific details are set forth to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application. Therefore, the present application is not limited to the specific examples disclosed below.

[0017] Unless the context requires otherwise, the term "comprising" is intended to be open and inclusive throughout the specification and claims, i.e., "including, but not limited to." In the description herein, terms such as "one embodiment," "some embodiments," "exemplary embodiments," "exemplary," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. General references to such terms do not necessarily refer to the same embodiment or example. Furthermore, a particular feature, structure, material, or characteristic described above may be included in any one or more embodiments or examples in any suitable manner.

[0018] "A and / or B" includes three combinations: A only, B only, and a combination of A and B.

[0019] In this specification, unless otherwise specified, "one or more" means one or more.

[0020] In this specification, the terms "for example," "such as," "example," "example," etc. are for explanatory purposes and indicate the relationship between the covered contents of the prior art solution and the subsequent art solution, but should not be understood as a limitation on the prior art solution or a limitation on the scope of protection of this specification. In this specification, unless otherwise specified, "A (for example, B)" indicates that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0021] In this specification, "selectable", "selectable" and "selectable" mean that it may or may not exist, that is, it means that it can be selected from two alternative solutions, "exist" and "not exist". If there are multiple "options" for one technical solution, each "option" is independent unless otherwise specified and unless there is a contradiction or mutual constraint relationship.

[0022] In this specification, the terms "optionally include" and "optionally include" mean "include or not include." "Optional component X" indicates whether component X is present or absent, or whether component X is included or not.

[0023] In this specification, the terms "first" and "second" in "first embodiment", "second embodiment", etc. are merely for descriptive purposes and should not be understood as indicating or suggesting relative importance or number, nor should they be understood as suggesting the importance or number of the technical features indicated.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used in the specification of this application are for the purpose of describing specific examples only and are not intended to be limiting of this application.

[0025] In this specification, technical features described in an open format include closed technical solutions consisting of the listed features, as well as open technical solutions including the listed features.

[0026] In this specification, unless otherwise specified, a numerical interval (i.e., a numerical range) is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval as well as each value between those two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two endpoint integers of the numerical range and each integer between those two endpoints, and is equivalent to directly listing each integer. When multiple numerical ranges describing a feature or characteristic are provided, those numerical ranges may be combined. In other words, unless otherwise specified, a numerical range disclosed herein should be understood to include any and all subranges contained therein. The "numeric value" in the numerical interval may be any quantitative value, such as a number, a percentage, a proportion, etc. A "numeric interval" can broadly include numerical interval types such as percentage intervals, percentage intervals, and ratio intervals.

[0027] In this specification, unless otherwise specified, the temperature parameters include both constant temperature processing and processing within a constant temperature range. The constant temperature processing allows for temperature fluctuations within the precision range of equipment control.

[0028] As used herein, the term "room temperature" or "normal temperature" generally refers to a temperature between 4°C and 35°C, for example, 20°C ± 5°C. In some examples herein, "room temperature" or "normal temperature" refers to a temperature between 10°C and 30°C. In some examples herein, "room temperature" or "normal temperature" refers to a temperature between 20°C and 30°C.

[0029] In this specification, unless otherwise specified, all percentage concentrations refer to final concentrations, which are the proportions of an added component in a system to which the component is added.

[0030] Energy storage, as an energy buffer in the power system, can rapidly absorb, store, and release energy, enabling the spatiotemporal transfer and transformation of energy, thereby mitigating challenges such as randomness, intermittency, and variability faced by the development of renewable energy. High-capacity lithium-ion battery energy storage systems are of great significance for the efficient utilization of new energy sources and the improvement of traditional power grids. As lithium-ion batteries increasingly dominate the energy storage market, improving the lifespan and safety of lithium-ion battery energy storage systems is crucial. Lithium-ion battery energy storage systems have high power and heat output, and due to the dense battery arrangement and limited heat dissipation space, heat dissipation is difficult to achieve quickly and uniformly. This can easily lead to heat accumulation between battery packs and excessive operating temperatures, thereby reducing the lifespan and safety of the batteries. Battery thermal management is a key factor in ensuring the continuous safe operation of energy storage systems. By controlling the temperature inside the energy storage system to the optimum temperature for lithium battery operation (10-35°C) and ensuring uniform temperature inside the battery pack, the risk of battery life reduction and thermal runaway is reduced, and the system plays an important role in the safety, efficiency, lifespan, and performance of energy storage.

[0031] Currently, the main technologies for energy storage thermal management are air cooling and liquid cooling. Air cooling uses gas as a cooling medium to reduce battery temperature through convection. It offers advantages such as simple structure, easy maintenance, and low cost. However, it suffers from poor heat dissipation efficiency, heat dissipation rate, and temperature uniformity. It is often used in energy storage base stations with low charge, low power density, and low heat generation rate. Liquid cooling uses a liquid as a cooling medium to remove heat generated by the battery through convection and heat exchange. Currently, common cooling media include water, ethylene glycol, aqueous solutions, fluorinated liquids, and insulating oils. Overall, liquid cooling systems have a high heat exchange coefficient, large specific heat capacity, and fast cooling speed. With the demand for larger battery capacity and higher system power density in future new energy plants and off-network energy storage, the market share of liquid cooling technology will rapidly increase. There are three common liquid cooling methods: cold plate, spray, and immersion. Immersion liquid cooling is a new, highly efficient, environmentally friendly, and energy-saving thermal management technology in which heat-generating electronic components are directly immersed in cooling liquid, and the cooling liquid directly contacts the electronic components to exchange heat and remove it.

[0032] To facilitate the transition of immersion liquid cooling technology to high-capacity, high-power energy storage battery systems, oil immersion cooling technology, which uses insulating oil as the cooling medium, has been rapidly developed. The entire battery pack is immersed in coolant, achieving an ultra-low temperature difference (±2°C) through liquid circulation, reducing the risk of thermal runaway in cells from the heat source and extending the battery's cycle life. It also completely isolates the battery system from the air. For example, if some cells experience thermal runaway, a flame-resistant coolant can be used to promote circulation and dissipate localized heat, preventing combustion and explosion of the battery cluster, improving the safety of the energy storage system and reducing losses. The widespread application of oil immersion cooling technology to energy storage batteries still faces many challenges. In particular, the characteristics of the coolant, which is in direct and continuous contact with the cells, directly affect the effectiveness of the oil immersion cooling system.

[0033] Vegetable insulating oil has excellent heat transfer properties, insulating properties, high ignition and flash points, and a high biodegradability rate of over 95%, making it a potential candidate for an environmentally friendly coolant in immersion liquid cooling technology. Currently, vegetable insulating oil is primarily used in high-voltage equipment such as oil-immersed transformers, but has not been widely used in the thermal management of lithium-ion battery energy storage. Vegetable insulating oil, primarily composed of triglycerides, is prone to hydrolysis. Research has shown that as hydrolysis progresses, the breakdown voltage of vegetable insulating oil decreases, the dielectric loss factor increases, and its insulating performance deteriorates. Furthermore, vegetable insulating oil itself has a high viscosity, which affects its fluidity and thus the heat transfer efficiency of the coolant. Therefore, addressing the key issues of viscosity and water content is an urgent priority when using vegetable insulating oil as a coolant in immersion liquid cooling battery energy storage.

[0034] Based on the above, according to a first aspect, some embodiments of the present application provide a vegetable insulating oil-based immersion coolant for electronic components and devices, the immersion coolant including a base oil and a viscosity-reducing additive, wherein the base oil includes the vegetable insulating oil, the viscosity-reducing additive includes one or more of a polyorganosiloxane-based compound, a silicon-based phosphate-based compound, and a silicon-based phosphite-based compound, and the viscosity of the viscosity-reducing additive is 0.02 mm or less. 2 / s~1.05mm 2 / s.

[0035] The vegetable insulating oil contains ester groups, and the oxygen atoms in these ester groups can form hydrogen bonds with water, giving the vegetable oil a high water absorption capacity. This allows the vegetable oil to absorb water from electronic components and devices without affecting their properties.

[0036] Polyorganosiloxane compounds are polymers containing Si-O-Si bonds as the main chain structure, and such polymers have characteristics such as high temperature resistance, low temperature resistance, oxidation resistance, low viscosity coefficient, shear resistance, low vapor pressure, low surface tension, water repellency, antifoaming properties, easy demolding, electrical insulation, and physiological inertness.

[0037] Silicon phosphate compounds have excellent properties such as good thermal stability, abrasion resistance, and chemical resistance.

[0038] In the immersion coolant provided in the examples of the present application, by adding one or a combination of polyorganosiloxane-based compounds, silicon phosphate-based compounds, and silicon phosphite-based compounds to vegetable insulating oil, the viscosity of these viscosity reducing additives can be reduced to 0.02 mm. 2 / s~1.05mm 2 / s, these viscosity-reducing additives can effectively reduce the viscosity of vegetable insulating oil and improve its fluidity, thereby improving the heat transfer and heat conduction effects of the immersion coolant. Meanwhile, these viscosity-reducing additives contain siloxane bonds, which can remove moisture from the immersion coolant, thereby improving the stability of the immersion coolant and reducing problems such as hydrolysis of the vegetable insulating oil and deterioration of its insulating performance.

[0039] Furthermore, compared to polyorganosiloxane compounds, silyl phosphonate compounds and silicon phosphite compounds also have a flame retardant effect, which can further improve the stability of the immersion coolant.

[0040] In some embodiments, the vegetable insulating oil comprises a combination of one or more of FR3 vegetable insulating oil, NP vegetable insulating oil, RDB vegetable insulating oil, VinsOil vegetable insulating oil, BIOTEMP vegetable insulating oil, MIDEL vegetable oil, and PFAE vegetable insulating oil.

[0041] In some embodiments, the polyorganosiloxane-based compound includes one or more combinations of dimethyldimethoxysilane, methyltrimethoxysilane, dimethylsiloxane, low-molecular-weight dimethylsiloxane, trimethylsilane, trimethoxysilane, pentamethyldisiloxane, and methoxytriethyleneoxypropyltrimethoxysilane.

[0042] In some embodiments, the silicon-based phosphate compound includes a combination of one or two of tris(trimethylsilyl) phosphate and bistrimethylsilylated vinyl phosphate.

[0043] In some embodiments, the silicon-based phosphite-based compound includes a combination of one or more of mono(trimethylsilyl)phosphite, tris(trimethylsilyl)phosphite, and diethyltrimethylsilylphosphite.

[0044] In some embodiments, the immersion cooling fluid further comprises an inorganic thermally conductive filler that is an insulating filler.

[0045] In these embodiments, the thermal conductivity and heat transfer effectiveness of the immersion cooling liquid can be further improved by adding inorganic thermally conductive fillers.

[0046] In some embodiments, the inorganic thermally conductive filler comprises a combination of at least one or more of boron nitride, aluminum nitride, silicon nitride, silicon oxide, aluminum oxide, zinc oxide, and magnesium oxide.

[0047] In these embodiments, these inorganic thermally conductive fillers have good heat conduction and heat transfer effects.

[0048] If the viscosity-reducing additive is not added to the vegetable insulating oil, aluminum oxide, as a polar medium, increases the medium loss and viscosity of the vegetable insulating oil, making it unsuitable for use in immersion liquid cooling. In these embodiments, adding a viscosity-reducing additive to the vegetable insulating oil can reduce the viscosity of the vegetable insulating oil, while using a polar medium such as aluminum oxide as an inorganic thermally conductive filler can offset the medium loss and viscosity increase of the vegetable insulating oil caused by using aluminum oxide as a polar medium, thereby making it advantageous for use in immersion liquid cooling.

[0049] In some embodiments, the immersion coolant has a weight percent of base oil between 50% and 90%, a weight percent of viscosity reducing additive between 10% and 50%, and a weight percent of inorganic thermally conductive filler between 1% and 10%.

[0050] In some embodiments, the electronic component / device is a lithium ion battery.

[0051] In these embodiments, the immersion coolant can be successfully applied in large-scale energy storage applications to provide liquid cooling for lithium-ion batteries.

[0052] In some embodiments, the immersion cooling liquid is prepared by mixing and stirring the components therein.

[0053] In these examples, the components of the immersion coolant are mixed and stirred to uniformly mix the base oil, viscosity-reducing additive, and inorganic thermally conductive filler contained in the immersion coolant, thereby improving the uniformity of the immersion coolant cooling.

[0054] In some embodiments, the stirring time is 2 to 5 hours.

[0055] In these examples, a uniform immersion cooling liquid can be produced by controlling the stirring time within the above range.

[0056] According to a second aspect, some embodiments of the present application provide an application of the submersion coolant according to the first aspect in a liquid cooling system.

[0057] In some embodiments, the liquid cooling system is integrated with a lithium-ion battery pack and can provide a high flow rate of immersion cooling liquid to contact the battery pack or multiple battery modules and circulate to dissipate heat from the battery pack or redistribute heat between the battery modules.

[0058] In order to objectively evaluate the technical effects of the examples of the present application, the present application will be illustrated in detail in the following examples and comparative examples.

[0059] In the following examples and comparative examples, all raw materials are commercially available, and in order to maintain the reliability of the experiments, the raw materials used in the following examples and comparative examples all have the same physical and chemical parameters or are produced by the same processing method.

[0060] Example 1 The immersion coolant provided in Example 1 contains FR3 vegetable insulating oil and dimethyldimethoxysilane, and the mass percentage of the FR3 vegetable insulating oil is 90% and the mass percentage of the dimethyldimethoxysilane is 10%. The immersion coolant was obtained by mechanically stirring the above components at room temperature for 2 hours to make them uniform.

[0061] Example 2 The immersion coolant provided in Example 2 contained FR3 vegetable insulating oil and dimethyldimethoxysilane, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 80% and the mass percent of dimethyldimethoxysilane was 20%. The above components were mechanically stirred at room temperature for 2 hours to homogenize, thereby obtaining the immersion coolant.

[0062] Example 3 The immersion coolant provided in Example 3 contained FR3 vegetable insulating oil and dimethyldimethoxysilane, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 50% and the mass percent of dimethyldimethoxysilane was 50%. The above components were mechanically stirred at room temperature for 2 hours to homogenize, thereby obtaining the immersion coolant.

[0063] Example 4 The immersion coolant provided in Example 4 contained FR3 vegetable insulating oil and dimethyldimethoxysilane, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 60% and the mass percent of dimethyldimethoxysilane was 40%. The above components were mechanically stirred at room temperature for 2 hours to homogenize, thereby obtaining the immersion coolant.

[0064] Example 5 The immersion coolant provided in Example 5 contained FR3 vegetable insulating oil and tris(trimethylsilyl) phosphate, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 50% and the mass percent of tris(trimethylsilyl) phosphate was 50%. The above components were mechanically stirred at room temperature for 2 hours to homogenize, thereby obtaining the immersion coolant.

[0065] Example 6 The immersion coolant provided in Example 6 contained FR3 vegetable insulating oil, dimethyldimethoxysilane, and boron nitride, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 70%, the mass percent of dimethyldimethoxysilane was 20%, and the mass percent of boron nitride was 10%. The above components were mechanically stirred at room temperature for 5 hours to homogenize, thereby obtaining the immersion coolant.

[0066] Example 7 The immersion coolant provided in Example 7 contained FR3 vegetable insulating oil, dimethyldimethoxysilane, and boron nitride, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 74%, the mass percent of dimethyldimethoxysilane was 25%, and the mass percent of boron nitride was 1%. The above components were mechanically stirred at room temperature for 5 hours to homogenize, thereby obtaining the immersion coolant.

[0067] Example 8 The immersion coolant provided in Example 8 contained FR3 vegetable insulating oil, dimethyldimethoxysilane, and tris(trimethylsilyl)phosphate, and calculated by mass percent, the mass percent of FR3 vegetable insulating oil was 70%, the mass percent of dimethyldimethoxysilane was 25%, and the mass percent of tris(trimethylsilyl)phosphate was 5%. The above components were mechanically stirred at room temperature for 2 hours to homogenize, thereby obtaining the immersion coolant.

[0068] (Comparative Example 1) FR3 vegetable insulating oil was used as the immersion coolant.

[0069] The immersion coolants obtained in Examples 1 to 7 and Comparative Example 1 were subjected to performance tests.

[0070] Thermal conductivity tests were conducted in accordance with ASTM D7896 "Standard Test Method for Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Engine Coolants and Related Fluids by Transient Hot-Wire Liquid Thermal Conductivity Method" to verify heat transfer performance, electrical conductivity tests were conducted in accordance with GB / T 6682 "Specifications and Test Methods for Water Use in Analytical Laboratories" to verify insulation performance, and kinematic viscosity tests were conducted in accordance with GB / T 265 "Methods for Measuring and Calculating Kinematic Viscosity of Petroleum Products."

[0071] The test results are shown in Table 1 below.

[0072] [Table 1]

[0073] From the above test results, the following conclusions can be drawn: (1) Comparing the original FR3 vegetable insulating oil with Example 1, the immersion coolant in Example 1 has a lower viscosity, which indicates that the polyorganosiloxane compound can effectively reduce the viscosity of the vegetable insulating oil, increase the fluidity of the immersion coolant, and reduce power consumption. (2) Comparing Example 1, Example 2, Example 3 and Example 4, it can be seen that as the content of vegetable insulating oil decreases, the viscosity of the immersion coolant gradually decreases, but as the content of viscosity-reducing additive increases, the thermal conductivity of the immersion coolant decreases. (3) Comparing Example 3 and Example 5, when a silicon phosphate compound was used instead of a polyorganosiloxane compound, the properties of the immersion coolant did not change significantly, indicating that the silicon phosphate compound could partially replace the function of the polyorganosiloxane compound. (4) Comparing Examples 3, 6, 7, and 8, it was found that the addition of an inorganic thermally conductive filler (e.g., boron nitride) can significantly increase the thermal conductivity of the immersion coolant, but the addition of an excessive amount of inorganic thermally conductive filler severely affects the viscosity of the immersion coolant, and that the balance between the viscosity and thermal conductivity of the coolant cannot be achieved unless the inorganic thermally conductive filler is added in an appropriate amount.

[0074] As described above, the present application provides an immersion coolant primarily containing vegetable insulating oil. By adding a viscosity-reducing additive to the vegetable insulating oil, the viscosity-reducing additive has a relatively low viscosity, thereby reducing the viscosity of the immersion coolant. Furthermore, the viscosity-reducing additive contains siloxane bonds, which can remove free water from the immersion coolant and improve its stability. Furthermore, by adding an inorganic thermally conductive filler, the thermal conductivity of the immersion coolant can be effectively improved while reducing the vegetable insulating oil content. By rationally selecting the amounts of the inorganic thermally conductive filler and viscosity-reducing additive, the viscosity and thermal conductivity of the immersion coolant can be balanced.

[0075] The technical features of the above embodiments can be combined in any manner. For the sake of simplicity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present specification.

[0076] The above examples only illustrate some embodiments of the present application, and although the descriptions are more specific and detailed, they cannot be understood as limiting the scope of the claims. It should be noted that those skilled in the art can make some modifications and improvements without departing from the concept of the present application, all of which are included in the scope of protection of the present application. Therefore, the scope of protection of this patent application should be determined by the scope of the attached claims.

Claims

1. A vegetable insulating oil-based immersion coolant for electronic components and devices, comprising vegetable insulating oil, a viscosity-reducing additive, and an inorganic thermally conductive filler, The viscosity reducing additive comprises one or more combinations of polyorganosiloxane-based compounds, silicon-based phosphate-based compounds, and silicon-based phosphite-based compounds, and has a viscosity of 0.02 mm 2 / s ~ 1.05 mm 2 / s, The polyorganosiloxane compound includes one or more combinations of dimethyldimethoxysilane, methyltrimethoxysilane, dimethylsiloxane, trimethylsilane, trimethoxysilane, pentamethyldisiloxane, and methoxytriethyleneoxypropyltrimethoxysilane; and / or The silicon-based phosphate compound includes one or a combination of two of tris(trimethylsilyl)phosphate and bis(trimethylsilylated vinyl phosphate); and / or the silicon-based phosphite-based compound comprises one or more combinations of mono(trimethylsilyl)phosphite, tris(trimethylsilyl)phosphite, and diethyltrimethylsilylphosphite; In the immersion coolant, the weight percent of the vegetable insulating oil is 50% to 90%, the weight percent of the viscosity-reducing additive is 10% to 50%, and the weight percent of the inorganic thermally conductive filler is 1% to 10%, with the proviso that the sum of the weight percents of the vegetable insulating oil, the viscosity-reducing additive, and the inorganic thermally conductive filler is 100%. A vegetable insulating oil-based immersion coolant for electronic components and devices.

2. The immersion coolant of claim 1 , wherein the inorganic thermally conductive filler is an insulating filler.

3. 3. The immersion coolant of claim 2, wherein the inorganic thermally conductive filler comprises a combination of at least one of boron nitride, aluminum nitride, silicon nitride, silicon oxide, aluminum oxide, zinc oxide, and magnesium oxide.

4. The immersion coolant of claim 1, wherein the electronic component or device is a lithium ion battery.

5. A method for producing an immersion coolant, characterized in that the immersion coolant according to any one of claims 1 to 3 is produced by mixing and stirring the components contained therein.

6. The method for producing an immersion cooling liquid according to claim 5, wherein the stirring time is 2 to 5 hours.

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