Pure electric vehicle cooling medium and preparation method thereof

Abstract

The invention relates to the technical field of pure electric vehicle cooling liquid preparation, in particular to a pure electric vehicle cooling medium and a preparation method thereof. The pure electric vehicle cooling medium provided by the invention comprises the following components in parts by weight: 2-5 parts of a metal composite corrosion inhibitor, 0.5-3 parts of a fluorinated liquid, 0.7-2 parts of a scale inhibition dispersant, 0.05-5 parts of a defoaming agent, 60-80 parts of ethylene glycol and 20-30 parts of deionized water. The metal composite corrosion inhibitor is a composition of 1-benzotriazole-methyl methacrylate, benzothiazole thiocarboxylic acid and polyoxyethylene alkyl phenol ether phosphate ester. The prepared cooling medium for the pure electric vehicle has the advantages of being high in heat dissipation efficiency and good in electrical insulation performance, a thermal management system of the electric vehicle can be well protected, the performance of a battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of pure electric vehicle coolant preparation, and in particular to a pure electric vehicle cooling medium and a preparation method thereof. Background Art

[0002] As an industry with rapid development momentum in recent years, the sales volume of new energy vehicles in my country will reach 6.887 million in 2022, a year-on-year increase of 93.4%. The State Council's "New Energy Vehicle Industry Development Plan (2021-2035)" clearly states that by 2035, pure electric vehicles will become the mainstream of new sales vehicles. With the rise of new energy vehicles, the role of coolant in its thermal management system is becoming more and more important, and new requirements are also put forward for the function of coolant.

[0003] New energy vehicles are mainly divided into pure electric vehicles, plug-in hybrid vehicles and fuel cell vehicles. The electric vehicle coolant invented in this article is suitable for pure electric vehicles. Although pure electric vehicles do not have the engine of traditional fuel vehicles, they will generate a lot of heat during high-speed operation and charging. In addition, the electrification level of electric vehicles is much higher than that of traditional fuel vehicles. In order to prevent problems such as circuit system short circuit caused by coolant leakage due to unexpected circumstances in electric vehicles, which may lead to the risk of spontaneous combustion of electric vehicles and battery explosion in severe cases, new requirements are also put forward for the conductivity of the coolant. Considering the above, in addition to the antifreeze, anti-corrosion and anti-scaling functions of traditional coolants, the prepared coolant also needs to have the properties of high thermal conductivity and low conductivity.

[0004] Coolants with high thermal conductivity can quickly transfer heat, improve the efficiency of the entire cooling system, reduce the working temperature of components such as batteries, and can well protect the thermal management system of electric vehicles, improving the performance and service life of batteries. Coolants with low electrical conductivity can effectively protect the safety of the circuit system and improve the safety of the entire vehicle. Therefore, it is urgent to develop a pure electric vehicle coolant with high thermal conductivity and low electrical conductivity and a preparation method thereof. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a pure electric vehicle cooling medium and a preparation method thereof. The pure electric vehicle cooling medium provided by the present invention has excellent heat dissipation performance and low electrical conductivity.

[0006] Specifically, the technical solution of the present invention is as follows: In a first aspect, the present invention provides a pure electric vehicle cooling medium, comprising the following components in parts by weight: 2 to 5 parts of a metal composite corrosion inhibitor, 0.5 to 3 parts of a fluorinated liquid, 0.7 to 2 parts of a scale inhibitor and dispersant, 0.05 to 5 parts of a defoaming agent, 60 to 80 parts of an antifreeze agent, and 20 to 30 parts of deionized water; wherein the metal composite corrosion inhibitor is a composition of 1-benzotriazole-methyl methacrylate, benzothiazole thiocarboxylic acid, and polyoxyethylene alkylphenol ether phosphate.

[0007] According to some preferred embodiments of the present invention, the cooling medium for the pure electric vehicle of the present invention comprises the following components in parts by weight: 2.3 to 3.5 parts of metal composite corrosion inhibitor, 1 to 3 parts of fluorinated liquid, 0.9 to 1.3 parts of scale inhibitor and dispersant, 1.2 to 1.5 parts of defoaming agent, 65 to 70 parts of antifreeze, and 20 to 30 parts of deionized water.

[0008] According to some preferred embodiments of the present invention, in the metal composite corrosion inhibitor, 1-benzotriazole-methyl methacrylate is 40% to 60%, benzothiazole thiocarboxylic acid is 20% to 40%, and polyoxyethylene alkylphenol ether phosphate is 10% to 30%.

[0009] According to some preferred embodiments of the present invention, the fluorinated liquid is 3M NOVEC HFE-7300, and its dosage is 1 to 3 parts, more preferably 1 to 2.5 parts. The present invention introduces the fluorinated liquid 3M Novec HFE-7300 into the pure electric vehicle coolant. This series of products is mostly used in immersion cooling systems, has high thermal conductivity, a wide range of operating temperature space, and at the same time, it has good electrical insulation performance, thermal stability and chemical stability, and is more in line with the goal of high thermal conductivity and low conductivity. In addition, compared with traditional engine coolants, the present invention has better metal corrosion inhibition for aluminum alloys in pure electric vehicles. In addition, the anti-foaming performance and rubber and plastic compatibility are also good, which can extend the service life of various parts of pure electric vehicles. This pure electric vehicle coolant can greatly improve the heat transfer efficiency of the thermal management system, enhance the safety of the circuit system, extend the service life of the pure electric vehicle battery, and improve the safety of the whole vehicle.

[0010] According to some preferred embodiments of the present invention, the scale inhibitor dispersant includes aminotrimethylene phosphoric acid and sodium polyacrylate; more preferably, the scale inhibitor dispersant is 50% to 60% aminotrimethylene phosphoric acid and 40% to 50% sodium polyacrylate. In the present invention, the scale inhibitor dispersant combination has a corrosion inhibition effect, which can not only prevent scale-forming salts in water from forming scale, but also has a protective effect on cast aluminum, solder, copper and other metals.

[0011] According to some preferred embodiments of the present invention, the defoaming agent is phosphate phthalate.

[0012] According to some preferred embodiments of the present invention, the antifreeze agent is ethylene glycol.

[0013] The pure electric vehicle cooling medium of the present invention preferably also includes an acid-base regulator. According to some preferred embodiments of the present invention, the acid-base regulator is sodium hydroxide or potassium hydroxide.

[0014] According to some preferred embodiments of the present invention, the pure electric vehicle cooling medium of the present invention comprises the following components in parts by weight: 1-benzotriazole-methyl methacrylate 1-1.8 parts, benzothiazole thiocarboxylic acid 0.7-1.2 parts, polyoxyethylene alkylphenol ether phosphate 0.3-0.5 parts, 3M Novec HFE-7300 1-3 parts, amino trimethylene phosphoric acid 0.5-0.7 parts, sodium polyacrylate 0.4-0.6 parts, phosphate ester phthalate 1.2-1.5 parts, sodium hydroxide or potassium hydroxide 0.2-0.5 parts, ethylene glycol 65-70 parts, deionized water 20-30 parts. Traditional engine coolant often has high conductivity. If the battery is out of control such as short circuit, the coolant leaks into the circuit system, which may cause a safety accident in serious cases. At the same time, the heat dissipation requirements of pure electric vehicles are more stringent than those of traditional engine vehicles. In order to ensure the normal operating temperature of the battery and avoid the occurrence of local overheating of the battery, the coolant is also required to have better thermal conductivity. The invention can not only reduce the conductivity of the coolant but also better improve the heat transfer efficiency of the coolant by adding the fluorinated liquid 3M Novec HFE-7300 into the coolant.

[0015] In a second aspect, the present invention provides a method for preparing the cooling medium of a pure electric vehicle, comprising the following steps: mixing antifreeze and deionized water according to a ratio; then adding a metal composite corrosion inhibitor, a fluorinated liquid and a dispersant, and stirring; then adding an acid-base regulator, and stirring; and then adding a defoaming agent, and stirring.

[0016] According to some preferred embodiments of the present invention, the following steps are included: mixing the antifreeze and deionized water according to a ratio; then adding a metal composite corrosion inhibitor, a fluorinated liquid and a dispersant, heating and stirring for more than 30 minutes; then adding an acid-base regulator, stirring for 40 to 50 minutes; then adding a defoaming agent, stirring for 10 to 20 minutes.

[0017] Beneficial effects: The present invention provides a pure electric vehicle cooling medium, comprising the following components by weight: 2-5 parts of metal composite corrosion inhibitor, 0.5-3 parts of fluorinated liquid, 0.7-2 parts of anti-scaling dispersant, 0.05-5 parts of defoaming agent, 60-80 parts of antifreeze, and 20-30 parts of deionized water; wherein the metal composite corrosion inhibitor is a composition of 1-benzotriazole-methyl methacrylate, benzothiazole thiocarboxylic acid, and polyoxyethylene alkylphenol ether phosphate. The pure electric vehicle cooling medium provided by the present invention has the characteristics of high heat dissipation efficiency and good electrical insulation, and can well protect the thermal management system of electric vehicles and improve the performance and service life of batteries. Compared with the prior art, the pure electric vehicle cooling medium of the present invention greatly improves the heat transfer efficiency of traditional coolants by introducing fluorinated liquid, solves the problem of temperature rise caused by the large amount of heat generated by the battery during the operation of the electric vehicle, and improves the safety of the whole vehicle; in addition, the pure electric vehicle cooling medium of the present invention has a certain corrosion inhibition effect on the 3003 aluminum alloy metal used more in the cold plate of the electric vehicle battery through a specific corrosion inhibitor combination, which can play a better protective role on the battery. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The endpoints and any values ​​of the ranges disclosed in this specification are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0020] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "specific implementations", or "some specific implementations" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0021] In the examples provided in this specification, if no specific techniques or conditions are specified, the techniques or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0022] In the following embodiments, the weight parts may be mg, g, kg or other weight units known in the art, or multiples thereof, such as 1 / 10, 1 / 100, 10 times, 100 times or the like.

[0023] In the following example, the preparation method of the provided high thermal conductivity and low electrical conductivity pure electric vehicle coolant (i.e., pure electric vehicle cooling medium) is as follows: ethylene glycol antifreeze and deionized water are mixed according to the ratio, and then the metal composite corrosion inhibitor, fluoride liquid, and dispersant are added to the antifreeze and deionized water and heated and stirred for more than 30 minutes, and then the acid-base regulator is added and stirred for 40 to 50 minutes, and then the defoaming agent is added and stirred for 10 to 20 minutes.

[0024] Example 1

[0025] The composition of the high thermal conductivity and low electrical conductivity pure electric vehicle coolant (total mass 100 kg) provided in this embodiment is shown in Table 1 below.

[0026] Table 1

[0027] Example 2

[0028] The composition of the high thermal conductivity and low electrical conductivity pure electric vehicle coolant (total mass 100 kg) provided in this embodiment is shown in Table 2 below.

[0029] Table 2

[0030] Example 3

[0031] The composition of the high thermal conductivity and low electrical conductivity pure electric vehicle coolant (total mass 100 kg) provided in this embodiment is shown in Table 3.

[0032] Table 3

[0033] Comparative Example 1

[0034] This comparative example provides a pure electric vehicle coolant, and other components and proportions are the same as those of Example 1, except that the fluorinated liquid is removed.

[0035] Comparative Example 2

[0036] This comparative example provides a pure electric vehicle coolant, and other compositions and proportions are the same as those in Example 1, except that benzothiazole thiocarboxylic acid and polyoxyethylene alkylphenol ether phosphate are replaced by 2,4-dihydroxybenzoic acid, and the amount used is the same as that in Example 1.

[0037] The repassivation potential of the 3003 aluminum alloy in the above embodiments and comparative examples was tested by an electrochemical method. The test results are listed in Table 4. Table 4 also lists the thermal conductivity increase rate, heat transfer enhancement percentage and conductivity reduction rate of the above embodiments and comparative examples. The definitions of the thermal conductivity increase rate, heat transfer enhancement percentage and conductivity reduction rate are shown in the following formula:

[0038] Table 4 Test results of high efficiency heat transfer pure electric vehicle coolant

[0039] According to the above examples, it can be seen that: 1) the high thermal conductivity and low electrical conductivity pure electric vehicle coolant of the present invention can greatly improve the thermal conductivity and heat transfer efficiency of the coolant by adding fluorinated liquid to the coolant; 2) the high thermal conductivity and low electrical conductivity pure electric vehicle coolant of the present invention uses a specific combination of composite corrosion inhibitors to have a good corrosion inhibition effect on 3003 aluminum alloy.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling medium for a pure electric vehicle, characterized in that: The invention comprises the following components in parts by weight: 2-5 parts of metal composite corrosion inhibitor, 0.5-3 parts of fluoride liquid, 0.7-2 parts of anti-scaling dispersant, 0.05-5 parts of defoaming agent, 60-80 parts of antifreeze agent and 20-30 parts of deionized water; the metal composite corrosion inhibitor is a composition of 1-benzotriazole-methyl methacrylate, benzothiazole thiocarboxylic acid and polyoxyethylene alkylphenol ether phosphate.

2. The pure electric vehicle cooling medium according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 2.3-3.5 parts of metal composite corrosion inhibitor, 1-3 parts of fluoride liquid, 0.9-1.3 parts of anti-scaling dispersant, 1.2-1.5 parts of defoaming agent, 65-70 parts of antifreeze agent and 20-30 parts of deionized water.

3. The pure electric vehicle cooling medium according to claim 2, characterized in that: In the metal composite corrosion inhibitor, 1-benzotriazole-methyl methacrylate accounts for 40% to 60%, benzothiazole thiocarboxylic acid accounts for 20% to 40%, and polyoxyethylene alkylphenol ether phosphate accounts for 10% to 30%.

4. The pure electric vehicle cooling medium according to any one of claims 1 to 3, characterized in that: The fluorinated liquid is 3MNOVEC HFE-7300.

5. The pure electric vehicle cooling medium according to any one of claims 1 to 4, characterized in that: The scale inhibitor and dispersant comprises aminotrimethylene phosphoric acid and sodium polyacrylate; the scale inhibitor and dispersant is 50% to 60% of aminotrimethylene phosphoric acid and 40% to 50% of sodium polyacrylate.

6. The pure electric vehicle cooling medium according to any one of claims 1 to 5, characterized in that: The defoaming agent is phosphate phthalate; and / or the antifreeze agent is ethylene glycol.

7. The pure electric vehicle cooling medium according to any one of claims 1 to 6, characterized in that: The invention also comprises an acid-base regulator, which is sodium hydroxide or potassium hydroxide.

8. The pure electric vehicle cooling medium according to any one of claims 1 to 7, characterized in that: The invention comprises the following ingredients in parts by weight: 1-1.8 parts of 1-benzotriazole-methyl methacrylate, 0.7-1.2 parts of benzothiazole thiocarboxylic acid, 0.3-0.5 parts of polyoxyethylene alkylphenol ether phosphate, 1-3 parts of 3M Novec HFE-7300, 0.5-0.7 parts of aminotrimethylene phosphoric acid, 0.4-0.6 parts of sodium polyacrylate, 1.2-1.5 parts of phosphate ester phthalate, 0.2-0.5 parts of sodium hydroxide or potassium hydroxide, 65-70 parts of ethylene glycol and 20-30 parts of deionized water.

9. The method for preparing a cooling medium for a pure electric vehicle according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing antifreeze agent and deionized water according to a proportion; then adding metal composite corrosion inhibitor, fluoride liquid and dispersant, and stirring; then adding acid-base regulator, and stirring; and then adding defoamer, and stirring.

10. The preparation method according to claim 9, characterized in that: The method comprises the following steps: mixing the antifreeze agent and deionized water according to a ratio; then adding a metal composite corrosion inhibitor, a fluoride liquid and a dispersant, heating and stirring for more than 30 minutes; then adding an acid-base regulator, stirring for 40 to 50 minutes; and then adding a defoamer, stirring for 10 to 20 minutes.

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