Cooling liquid and application thereof

Abstract

The invention discloses cooling liquid and application thereof, and belongs to the technical field of cooling liquid, and the cooling liquid is a composition containing the following components: ethylene glycol, sodium benzoate, benzotriazole, sodium caprylate, disodium sebacate, triethanolamine, dimethyl methylphosphonate, disodium hydrogen phosphate, 2-mercaptobenzothiazole, tetrasodium hydroxyethylidene-1, 1-diphosphonate and an imidazole defoaming agent. Rhodamine B and deionized water; wherein in percentage by weight, the content of the dimethyl methylphosphonate is 1 to 2 weight percent, and the content of the disodium hydrogen phosphate is 0 to 0.7 weight percent. The application of the cooling liquid in a liquid cooling system of energy storage equipment is specifically the application in a liquid cooling system of electrochemical energy storage equipment, and especially the application in a liquid cooling system of a lithium battery module. The cooling liquid has the advantages of being good in corrosion inhibition effect, excellent in stability and flame retardant property and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of cooling liquids, and in particular, relates to a cooling liquid and an application thereof. Background Art

[0002] Building a new power system with new energy as the main body is a key task in the future energy field. However, new energy generation such as solar energy, wind energy and tidal energy is intermittent and volatile, which will affect the safe and stable operation of the power grid. Therefore, energy storage devices are needed to collect and store energy, smooth power output, and thus solve the instability and other problems faced by new energy generation. Among the many energy storage technologies, electrochemical energy storage is a technology that converts electrical energy into chemical energy and stores it for subsequent use. It has high flexibility in time and space distribution and is therefore vigorously promoted. Among them, lithium-ion batteries have become the mainstream electrochemical energy storage devices due to their high energy density and cycle stability. In practical applications, multiple lithium-ion battery cells are usually combined in series or parallel to form a battery module. Since the battery cells are stacked and arranged and enclosed in a shell for use, the heat generated by the battery module during operation is difficult to transfer to the outside world in time, which will not only accelerate the degradation of the battery module and the reduction of application performance, but also cause thermal runaway of the battery module in severe cases. Therefore, air cooling or liquid cooling is required to dissipate heat from the battery module. Compared with the air cooling system, the liquid cooling system has high heat dissipation efficiency and can absorb and take away the heat generated by the battery module in time. In addition, the liquid cooling system can achieve more precise temperature control and avoid uneven temperature.

[0003] Coolant is the heat transfer medium in the liquid cooling system, which has the functions of cooling, corrosion prevention, anti-scaling and anti-freezing. Ethylene glycol-water-based cooling medium is widely used in liquid cooling system due to its advantages such as low toxicity, low freezing point, good cooling effect and maintainability. In order to inhibit the corrosion of various metal parts by the cooling medium during use, it is generally necessary to add corrosion inhibitor additives to the cooling medium. At present, most cooling media use inorganic salts such as nitrite, phosphate, molybdate, borate and silicate as corrosion inhibitor additives to prevent corrosion of various metal materials. However, the corrosion inhibition performance of nitrite, phosphate, molybdate and borate on aluminum and aluminum alloy is generally poor. Furthermore, nitrite is toxic and can cause harm to the human body and the environment. Phosphate is easy to combine with magnesium ions and calcium ions in water to form scale during use, which reduces the heat transfer performance of the coolant. Silicate has a good anti-corrosion effect on each metal, but its stability is poor. It is easy to produce gel-like substances during long-term storage and use, which not only affects its corrosion inhibition performance, but also causes pipeline blockage, thereby interfering with the normal operation of the liquid cooling system. To avoid the above problems, some organic corrosion inhibitors (such as fatty acid salts, aromatic acid salts, nitrogen azole compounds and amines, etc.) have shown great application prospects as substitutes for inorganic corrosion inhibitors. However, in addition to being expensive and having high preparation costs, most of the existing organic corrosion inhibitors not only have poor antioxidant properties in the coolant and are prone to hydrolysis, but also cause the coolant to become sticky during long-term operation, which has an adverse effect on the cooling and anti-corrosion effects of the coolant. In addition, the safe and stable operation of the electrochemical energy storage system also places requirements on the flame retardant properties of the ethylene glycol-water-based coolant. If a leak occurs in the liquid cooling system, it is easy to cause the coolant to burn at high temperatures or when exposed to open flames, which in turn causes the energy storage system to catch fire, posing a huge fire hazard.

[0004] Therefore, in order to meet the use requirements of the liquid cooling system of the lithium battery module in the energy storage power station, it is urgent to develop a new coolant with good corrosion inhibition effect, excellent stability and flame retardant properties. Summary of the invention

[0005] The purpose of the present invention is to address the problems faced by the above-mentioned prior art and to propose a coolant and its application in an electrochemical energy storage device. The coolant has the advantages of good corrosion inhibition effect, excellent stability and flame retardancy, etc.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, a cooling liquid is provided, which is a composition containing the following components:

[0008] Ethylene glycol, sodium benzoate, benzotriazole, sodium octanoate, disodium sebacate, triethanolamine, dimethyl methylphosphonate, disodium hydrogen phosphate, 2-mercaptobenzothiazole, tetrasodium hydroxyethylidene diphosphonate, imidazole defoamer, rhodamine B and deionized water;

[0009] Wherein, by weight percentage, the content of dimethyl methylphosphonate is 1-2 wt%, and the content of disodium hydrogen phosphate is 0-0.7 wt%.

[0010] Furthermore, the coolant comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.2-0.6wt% of sodium benzoate, 0.1-0.48wt% of benzotriazole, 0.7-1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.15-0.75wt% of triethanolamine, 1-2wt% of dimethyl methylphosphonate, 0-0.7wt% of disodium hydrogen phosphate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.001-0.005wt% of rhodamine B, and the balance is deionized water.

[0011] Furthermore, the coolant comprises the following components by weight percentage: 55.66wt% ethylene glycol, 0.2-0.6wt% sodium benzoate, 0.1-0.48wt% benzotriazole, 1-1.3wt% sodium octanoate, 0.15wt% disodium sebacate, 0.15-0.75wt% triethanolamine, 1-2wt% dimethyl methylphosphonate, 0-0.7wt% disodium hydrogen phosphate, 0.0066wt% 2-mercaptobenzothiazole, 0.00283wt% tetrasodium hydroxyethylidene diphosphonate, 0.03wt% imidazole defoamer, 0.001-0.005wt% rhodamine B, and the balance is deionized water.

[0012] According to a specific embodiment of the present invention, the coolant comprises the following components by weight percentage: 55.66% ethylene glycol, 0.4% sodium benzoate, 0.1% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.003% rhodamine B, and the balance is deionized water.

[0013] According to a specific embodiment of the present invention, the coolant comprises the following components by weight percentage: 55.66% ethylene glycol, 0.6% sodium benzoate, 0.2% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.001% rhodamine B, and the balance is deionized water.

[0014] According to a specific embodiment of the present invention, the coolant comprises the following components by weight percentage: 55.66% ethylene glycol, 0.4% sodium benzoate, 0.3% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.005% rhodamine B, and the balance is deionized water.

[0015] According to a specific embodiment of the present invention, the coolant comprises the following components by weight percentage: 55.66% ethylene glycol, 0.2% sodium benzoate, 0.2% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.005% rhodamine B, and the balance is deionized water.

[0016] According to a specific embodiment of the present invention, the coolant comprises the following components by weight percentage: the following components by weight percentage: 55.66% ethylene glycol, 0.6% sodium benzoate, 0.2% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 2% dimethyl methylphosphonate, 0.7% disodium hydrogen phosphate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.003% rhodamine B, and the balance is deionized water.

[0017] According to a specific embodiment of the present invention, the coolant comprises the following components by weight percentage: 55.66% ethylene glycol, 0.4% sodium benzoate, 0.16% benzotriazole, 1% sodium octanoate, 0.15% disodium sebacate, 0.15% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.001% rhodamine B, and the balance is deionized water.

[0018] In a second aspect, the application of the coolant in a liquid cooling system of an energy storage device is specifically an application in a liquid cooling system of an electrochemical energy storage device.

[0019] Preferably, it is used in a liquid cooling system of a lithium battery module.

[0020] Compared with the prior art, through the above technical solution, the beneficial effects of the present invention are:

[0021] The coolant of the present invention has high stability. The tetrasodium hydroxyethylidene diphosphonate used in the coolant composition belongs to the organic phosphate scale inhibitor, which can form a stable complex with various metal ions such as copper and iron, and can well inhibit the scaling of the liquid cooling system of the lithium battery module in the electrochemical energy storage device, and will not deteriorate when used at high temperature or for a long time. In addition, according to the method in Appendix H of the National Standard of the People's Republic of China GB / T23436, the coolant was tested for stability at high temperature and low temperature, and no crystalline precipitation was found.

[0022] The coolant of the present invention has obvious corrosion inhibition effect. Sodium octanoate in the coolant composition can effectively slow down the corrosion of carbon steel, magnesium and aluminum alloys. It plays a protective role by being adsorbed on the metal surface to form a protective film. The combination of disodium sebacate and other corrosion inhibitors can play a synergistic corrosion inhibition role, which not only greatly improves the corrosion inhibition efficiency, but also can reduce the addition amount of other corrosion inhibitors. In addition, according to the test method in the National Standard of the People's Republic of China GB-29743.1-2022 "Motor Vehicle Engine Coolant", the glassware corrosion experiment was carried out. After reacting for 336±2h at 88±2℃, the mass change of the copper test piece was 0.175~9.275mg, the mass change of the solder test piece was 4.55~20.9mg, the mass change of the brass test piece was 0~1.75mg, the mass change of the 20# steel test piece was 0~4.025mg, the mass change of the cast iron test piece was 0.175~3.325mg, and the mass change of the cast aluminum test piece was 0.4~3.675mg, which were all less than the standard weight loss (Table 3). Therefore, the coolant can effectively slow down the corrosion and damage to the electrochemical energy storage liquid cooling system, and greatly reduce the operation and maintenance costs.

[0023] The coolant of the present invention has excellent flame retardant properties. The dimethyl methyl phosphate used in the coolant composition is a colorless transparent liquid, has good mutual solubility with water and various organic solvents, is inexpensive, decomposes to form a phosphoric acid layer and covers the surface of the burning object when it encounters fire, thereby isolating oxygen and stopping combustion. It has excellent flame retardant properties and greatly improves the safety of the liquid cooling system. The open flash point of the coolant is measured according to the test method of the ignition temperature of the hot air furnace method of the national standard GB / T4610 of the People's Republic of China. The dimethyl methyl phosphate contained in the formula improves the flash point of the coolant, and when disodium hydrogen phosphate exists, the effect of dimethyl methyl phosphate on improving the flash point of the coolant is more obvious, and the two have a synergistic effect on improving the flash point of the coolant. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention. In order to avoid confusing the essence of the present invention, well-known methods and processes are not described in detail.

[0025] Example 1

[0026] A coolant composition for a liquid cooling system of an electrochemical energy storage lithium battery module comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.4wt% of sodium benzoate, 0.1wt% of benzotriazole, 1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.75wt% of triethanolamine, 1wt% of dimethyl methylphosphonate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.003wt% of rhodamine B, and the balance is deionized water.

[0027] Example 2

[0028] A coolant composition for a liquid cooling system of an electrochemical energy storage lithium battery module comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.6wt% of sodium benzoate, 0.2wt% of benzotriazole, 1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.75wt% of triethanolamine, 1wt% of dimethyl methylphosphonate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.001wt% of rhodamine B, and the balance is deionized water.

[0029] Example 3

[0030] A coolant composition for a liquid cooling system of an electrochemical energy storage lithium battery module comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.4wt% of sodium benzoate, 0.3wt% of benzotriazole, 1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.75wt% of triethanolamine, 1wt% of dimethyl methylphosphonate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.005wt% of rhodamine B, and the balance is deionized water.

[0031] Example 4

[0032] A coolant composition for a liquid cooling system of an electrochemical energy storage lithium battery module comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.2wt% of sodium benzoate, 0.2wt% of benzotriazole, 1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.75wt% of triethanolamine, 1wt% of dimethyl methylphosphonate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.005wt% of rhodamine B, and the balance is deionized water.

[0033] Example 5

[0034] A coolant composition for a liquid cooling system of an electrochemical energy storage lithium battery module comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.6wt% of sodium benzoate, 0.2wt% of benzotriazole, 1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.75wt% of triethanolamine, 2wt% of dimethyl methylphosphonate, 0.7wt% of disodium hydrogen phosphate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.003wt% of rhodamine B, and the balance is deionized water.

[0035] Example 6

[0036] A coolant composition for a liquid cooling system of an electrochemical energy storage lithium battery module comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.4wt% of sodium benzoate, 0.16wt% of benzotriazole, 1wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.15wt% of triethanolamine, 1wt% of dimethyl methylphosphonate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.001wt% of rhodamine B, and the balance is deionized water.

[0037] The coolant prepared in the above-mentioned Examples 1-6 was subjected to relevant performance tests. Corrosion inhibition performance test According to the test method in the National Standard of the People's Republic of China GB-29743.1-2022 "Motor Vehicle Engine Coolant", the glassware corrosion experiment was carried out. Six metal test pieces of copper, solder, brass, 20# steel, cast iron and cast aluminum were reacted at 88±2°C for 336±2h, and the results of the mass change of the metal test pieces are shown in Table 1. The stability of the coolant was evaluated according to the method in Appendix H of the National Standard of the People's Republic of China GB / T23436. The coolant was kept at 50℃±2℃ and -15℃±2℃ for 8h, and then kept at room temperature for 16h to observe whether the liquid had crystalline precipitation and irritating odor. The results are shown in Table 2. The flash point of the coolant was tested according to the National Standard of the People's Republic of China GB / T 3536-2008 "Cleveland Open Cup Method for Determination of Flash Point and Fire Point of Petroleum Products" to evaluate the flame retardant properties of the coolant. The flash point test results of the coolant are shown in Table 3.

[0038] Table 1 Glassware corrosion test results

[0039]

[0040]

[0041] It can be seen from the test results in Table 1 that the coolant of the present invention has good corrosion inhibition to various metals, and can well protect the liquid cooling system of the lithium battery module and extend its service life.

[0042] Table 2 Stability test results

[0043] Test items Appearance color odor Example 1 Transparent liquid Pink No irritating odor Example 2 Transparent liquid Pink No irritating odor Example 3 Transparent liquid Pink No irritating odor Example 4 Transparent liquid Pink No irritating odor Example 5 Transparent liquid Pink No irritating odor Example 6 Transparent liquid Pink No irritating odor

[0044] Table 3 Flame retardant performance test results

[0045]

[0046] As shown in Table 3, compared with the formula without dimethyl methyl phosphate, when the formula contains 0.5wt% and 1wt% of dimethyl methyl phosphate, the flash point increases from 118°C to 122°C and 124°C respectively, which indicates that the presence of dimethyl methyl phosphate will increase the flash point of the coolant, and the flash point increases with the increase of the concentration of dimethyl methyl phosphate (in the range of 0-1%). When the content of dimethyl methyl phosphate in the formula increases from 1wt% to 2wt%, the flash point does not change, which indicates that excessive dimethyl methyl phosphate will not increase the flash point of the coolant. When the formula contains 2wt% of dimethyl methyl phosphate, after introducing 7.5g / L of disodium hydrogen phosphate into the coolant, the flash point of the coolant is increased from 124°C to 128°C, which indicates that the presence of 7.5g / L of disodium hydrogen phosphate will increase the flash point of the coolant. In addition, when the formula contains 7.5 g / L of disodium hydrogen phosphate, the content of dimethyl methyl phosphate increases from 0.5wt% to 2wt%, and the flash point of the corresponding coolant increases from 120°C to 128°C, which indicates that there is a synergistic effect between dimethyl methyl phosphate and disodium hydrogen phosphate on improving the flash point of the coolant.

[0047] Obviously, the description of the above embodiments is only used to help understand the method of the present invention and its core idea, but for ordinary technicians in this field, various changes, modifications and substitutions can be made to these embodiments without departing from the spirit and principles of the present invention as described in the claims, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cooling liquid, characterized in that: It is a composition containing the following components: Ethylene glycol, sodium benzoate, benzotriazole, sodium octanoate, disodium sebacate, triethanolamine, dimethyl methylphosphonate, disodium hydrogen phosphate, 2-mercaptobenzothiazole, tetrasodium hydroxyethylidene diphosphonate, imidazole defoamer, rhodamine B and deionized water; Wherein, by weight percentage, the content of dimethyl methylphosphonate is 1-2 wt%, and the content of disodium hydrogen phosphate is 0-0.7 wt%.

2. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.2-0.6wt% of sodium benzoate, 0.1-0.48wt% of benzotriazole, 0.7-1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.15-0.75wt% of triethanolamine, 1-2wt% of dimethyl methylphosphonate, 0-0.7wt% of disodium hydrogen phosphate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.001-0.005wt% of rhodamine B, and the balance is deionized water.

3. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66wt% of ethylene glycol, 0.2-0.6wt% of sodium benzoate, 0.1-0.48wt% of benzotriazole, 1-1.3wt% of sodium octanoate, 0.15wt% of disodium sebacate, 0.15-0.75wt% of triethanolamine, 1-2wt% of dimethyl methylphosphonate, 0-0.7wt% of disodium hydrogen phosphate, 0.0066wt% of 2-mercaptobenzothiazole, 0.00283wt% of tetrasodium hydroxyethylidene diphosphonate, 0.03wt% of imidazole defoamer, 0.001-0.005wt% of rhodamine B, and the balance is deionized water.

4. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66% ethylene glycol, 0.4% sodium benzoate, 0.1% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.003% rhodamine B, and the balance is deionized water.

5. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66% ethylene glycol, 0.6% sodium benzoate, 0.2% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.001% rhodamine B, and the balance is deionized water.

6. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66% ethylene glycol, 0.4% sodium benzoate, 0.3% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.005% rhodamine B, and the balance is deionized water.

7. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66% ethylene glycol, 0.2% sodium benzoate, 0.2% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.005% rhodamine B, and the balance is deionized water.

8. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: the following components by weight percentage: 55.66% ethylene glycol, 0.6% sodium benzoate, 0.2% benzotriazole, 1.3% sodium octanoate, 0.15% disodium sebacate, 0.75% triethanolamine, 2% dimethyl methylphosphonate, 0.7% disodium hydrogen phosphate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.003% rhodamine B, and the balance is deionized water.

9. The coolant according to claim 1, characterized in that: The invention comprises the following components by weight percentage: 55.66% ethylene glycol, 0.4% sodium benzoate, 0.16% benzotriazole, 1% sodium octanoate, 0.15% disodium sebacate, 0.15% triethanolamine, 1% dimethyl methylphosphonate, 0.0066% 2-mercaptobenzothiazole, 0.00283% tetrasodium hydroxyethylidene diphosphonate, 0.03% imidazole defoamer, 0.001% rhodamine B, and the balance is deionized water.

10. Application of the coolant according to any one of claims 1 to 9 in a liquid cooling system for energy storage equipment, characterized in that: Application in liquid cooling system of electrochemical energy storage equipment.

11. The use of the coolant according to claim 10 in a liquid cooling system for energy storage equipment, characterized in that: Application in lithium battery module liquid cooling system.

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