Intelligent temperature control liquid composition for charging pile and preparation method thereof

Abstract

The application belongs to the field of high-power charging piles used by new energy electric vehicles, and discloses a temperature control liquid composition for intelligent charging piles and a preparation method thereof, wherein components of the temperature control liquid composition are composed of 45-50 parts of an alcohol mixture, 45-50 parts of deionized water, 0.5-1 parts of a phosphate, 0.5-1 parts of a silicate, 0.5-1 parts of an organic acid, and 0.02-0.04 parts of a zinc salt in terms of weight fraction. The temperature control liquid composition has good compatibility with a sealing element of a charging pile system composed of a three-element ethylene-propylene-diene rubber, a silicone rubber, a hydrogenated butyl nitrile rubber and a thermoplastic polyurethane elastomer rubber, and has excellent metal corrosion resistance, and therefore has a good application and promotion prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-power charging piles used by new energy electric vehicles, in particular to a temperature control liquid composition for intelligent charging piles and a preparation method thereof. BACKGROUND

[0002] In recent years, with the increasing number of electric vehicles, the long charging time is one of the reasons why ordinary consumers cannot accept electric vehicles. In order to shorten the charging time and ensure that the refueling time of the fuel vehicle is roughly the same, countries are actively researching high-power charging. The charging power of high-power charging usually needs to be 350-600kw to ensure that the driving range of the electric vehicle reaches 400km in 15 minutes.

[0003] In high-power charging, the heating of the cable is always a problem that cannot be avoided. The traditional way is to increase the cross-sectional area of the copper conductor in the cable to increase the current-carrying capacity of the cable. However, if the current reaches 350A-600A, the cross-sectional area of the copper conductor of the cable needs to reach 120-240mm 2 , which will increase the overall outer diameter and weight of the cable, making it difficult to operate and only relying on auxiliary tools to assist in charging. At the same time, it is also difficult to maintain.

[0004] The traditional air cooling technology cannot meet the heat dissipation demand, and the liquid cooling technology has become the most reliable solution. The liquid cooling heat dissipation technology can solve the problems of high failure rate and high noise of the charging module. The heating devices inside the charging module and system perform heat exchange with the radiator through the cooling liquid, and are completely isolated from the external environment, without contact with dust, flammable and explosive gases, etc. Therefore, the reliability of the liquid cooling charging system is much higher than that of the traditional air cooling charging system. At the same time, the liquid cooling charging module has no cooling fan, and the cooling liquid is driven by a water pump for heat dissipation, and the module itself has zero noise. The heat dissipation capacity of the liquid cooling module is 10-20℃ lower than that of the forced air cooling module, and it has a higher IP level of protection, suitable for application in harsh environments with more dust, with a service life extended by 1-2 times, reduced maintenance and repair in the later period, and reduced operating costs. However, the current cable liquid cooling technology has the problems of difficult heat dissipation, poor compatibility with rubber such as EPDM, and poor metal corrosion resistance. SUMMARY

[0005] Based on the problems of the prior art, the present application aims to provide a temperature control liquid composition for intelligent charging piles and a preparation method thereof. The temperature control liquid has good compatibility with EPDM, silicone rubber, hydrogenated nitrile rubber, and thermoplastic polyurethane elastomer rubber, and has excellent metal corrosion resistance.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] An intelligent temperature control liquid composition for charging pile, each component of which is composed of the following components in parts by weight:

[0008]

[0009]

[0010] Preferably, the alcohol mixture is a mixture of ethylene glycol and 1,2 propylene glycol in a mass ratio of 1:1.

[0011] Preferably, the conductivity of the deionized water is less than 0.1 mu s / cm.

[0012] Preferably, the phosphate salt is a mixture of one or more of tetrasodium aminotrimethylene phosphonate, ethylenediamine tetramethylene phosphonate sodium and tetrasodium hydroxyethylidene diphosphonate.

[0013] Preferably, the silicate salt is a mixture of one or more of methyl sodium silicate, vinyl sodium silicate, aminopropyl sodium silicate and polyether organic sodium disilicate.

[0014] Preferably, the organic acid is a mixture of one or more of p-tert-butyl benzoic acid, sebacic acid, azelaic acid, phthalic acid, glutaric acid and methyl sulfonic acid.

[0015] Preferably, the zinc salt is a mixture of one or both of zinc carbonate and zinc phytate.

[0016] The application also provides a preparation method of the intelligent temperature control liquid composition for charging pile, which comprises the following steps: adding deionized water into an alcohol mixture according to a predetermined ratio, mechanically stirring at room temperature for 0.5-1 h, heating to 40-50 DEG C, then sequentially adding a phosphate salt, a silicate salt and a zinc salt, mechanically stirring at 40-50 DEG C for 1.5-2.5 h, and then adding an organic acid, and mechanically stirring at room temperature for 0.5-1.5 h to obtain the intelligent temperature control liquid composition for charging pile.

[0017] Compared with the prior art, the temperature control liquid composition has good anti-freezing performance (freezing point at -35 DEG C), good compatibility with the sealing element of a charging pile system composed of ethylene-propylene-diene rubber, silicone rubber, hydrogenated nitrile rubber and thermoplastic polyurethane elastomer rubber, and excellent metal corrosion resistance, thus having good application and promotion prospects.

[0018] (1) The temperature control liquid composition of the application adds an organic acid as an inhibitor, so that the temperature control liquid has good compatibility with ethylene-propylene-diene rubber, silicone rubber, hydrogenated nitrile rubber and thermoplastic polyurethane elastomer rubber.

[0019] (2) The formula system of the present application uses organic acid, phosphate, silicate and zinc salt as additives of the temperature control liquid, and the four have synergistic effect, which can form a protective layer on the surface of aluminum, copper and other metals, and improve the corrosion inhibition effect of the temperature control liquid on metals (copper, aluminum). DETAILED DESCRIPTION

[0020] The present application will be described in detail below with examples, which illustrate the features and advantages of the present application. The following examples are not a limitation of the present application, and the formula prepared by the skilled in the art according to the idea and raw material ratio of the present application also belongs to the protection scope of the present application.

[0021] The specific preparation method of the temperature control liquid composition for intelligent charging pile in the following examples is as follows:

[0022] Mix 1,2 propanediol and ethylene glycol according to the mass ratio of 1:1, stir at 800 rpm at room temperature for 1 h to form an alcohol mixture. Add deionized water with conductivity less than 0.1 μs / cm to the alcohol mixture, stir at 800 rpm at room temperature for 0.5 h to form an alcohol mixture solution. Warm the alcohol mixture solution to 40℃, then add phosphate, silicate and zinc salt in turn, stir at 800 rpm at 40℃ for 2 h; then add organic acid, stir at 800 rpm at room temperature for 1 h, to obtain the temperature control liquid composition for intelligent charging pile.

[0023] The performance test method (or standard) of the cooling liquid obtained in the following examples is as follows:

[0024] The sealing compatibility test method can refer to electric vehicle cooling liquid (NB / SH / T6047-2021). Place the EPDM rubber, silicone rubber, hydrogenated nitrile rubber or thermoplastic polyurethane elastomer rubber in the temperature control liquid at a temperature of 70℃, and after 168 h of immersion, measure the sample volume change rate, hardness change (IRRD), tensile strength change rate and elongation at break.

[0025] The metal corrosion prevention performance detection method is engine cooling liquid corrosion test method (glassware method) SH / T0085-91.

[0026] Example 1

[0027] A temperature control liquid composition for intelligent charging pile, comprising the following raw materials by weight: 1,2 propanediol 24 parts, ethylene glycol 24 parts, deionized water 49.6 parts, aminotri(methylene) phosphate 0.3 parts, ethylenediamine tetra(methylene) phosphate 0.3 parts, methyl sodium silicate 0.5 parts, vinyl sodium silicate 0.5 parts, p-t-butyl benzoic acid 0.2 parts, sebacic acid 0.2 parts, methyl sulfonic acid 0.3 parts, and zinc carbonate 0.03 parts.

[0028] Example 2 (without organic acid)

[0029] The temperature control liquid configured in this example differs from that of Example 1 in that it does not contain p-tert-butyl benzoic acid, sebacic acid, and methyl sulfonic acid.

[0030] Example 3 (without phosphates)

[0031] The temperature control liquid configured in this example differs from that of Example 1 in that it does not contain amino trimethylene phosphate and ethylenediamine tetramethylene phosphate.

[0032] Example 4 (without silicates)

[0033] The temperature control liquid configured in this example differs from that of Example 1 in that it does not contain methyl sodium silicate and vinyl sodium silicate.

[0034] Example 5 (without zinc salts)

[0035] The temperature control liquid configured in this example differs from that of Example 1 in that it does not contain zinc carbonate.

[0036] Comparative Example 1 (sodium molybdate, potassium silicate, and benzotriazole are used instead of organic acids)

[0037] A temperature control liquid composition for intelligent charging piles, comprising the following raw materials in parts by weight: 1,2 propylene glycol 24 parts, ethylene glycol 24 parts, deionized water 49.6 parts, amino trimethylene phosphate 0.3 parts, ethylenediamine tetramethylene phosphate 0.3 parts, methyl sodium silicate 0.5 parts, vinyl sodium silicate 0.5 parts, sodium molybdate 0.2 parts, potassium silicate 0.2 parts, benzotriazole 0.3 parts, and zinc carbonate 0.03 parts.

[0038] Comparative Example 2 (different organic acids)

[0039] A temperature control liquid composition for intelligent charging piles, comprising the following raw materials in parts by weight: 1,2 propylene glycol 24 parts, ethylene glycol 24 parts, deionized water 49.6 parts, amino trimethylene phosphate 0.3 parts, ethylenediamine tetramethylene phosphate 0.3 parts, methyl sodium silicate 0.5 parts, vinyl sodium silicate 0.5 parts, p-tert-butyl benzoic acid 0.2 parts, phthalic acid 0.2 parts, glutaric acid 0.3 parts, and zinc carbonate 0.03 parts.

[0040] The detection results of the metal corrosion resistance and sealing compatibility of the temperature control liquids configured in the above examples and comparative examples are shown in Table 1.

[0041] Table 1 Detection results of metal corrosion resistance and sealing compatibility of temperature control liquids

[0042]

[0043] According to Table 1, the absolute value of the corrosion mass change of the glassware of Example 1 is obviously less than that of Examples 2 to 5 and Comparative Example 1, because Example 1 contains organic acid, phosphate, silicate and zinc salt, which have a synergistic effect, and can form a protective layer on the surface of metals such as aluminum and copper, thereby improving the corrosion inhibition effect of the temperature control liquid on metals (copper and aluminum); the absolute value of the sealing compatibility of Example 1, Examples 3 to 5 and Comparative Example 2 is less than that of Example 2 and Comparative Example 1, because the organic acid contained in Example 1, Examples 3 to 5 and Comparative Example 2 has good compatibility with EPDM, silicone rubber, hydrogenated nitrile rubber and thermoplastic polyurethane elastomer rubber.

[0044] The above description is merely exemplary embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A temperature control liquid composition for intelligent charging piles, characterized by, The components are composed of the following weight parts: alcohol mixture 45-55 parts deionized water 45-55 parts phosphate 0.5-1 part silicate 0.5-1 part organic acid 0.5-1 part zinc salt 0.02-0.04 parts; The alcohol mixture is a mixture of ethylene glycol and 1,2 propylene glycol in a mass ratio of 1:1; the phosphate is a mixture of one or several of tetrasodium aminotrimethylene phosphonate, ethylenediamine tetramethylene phosphonate sodium and tetrasodium hydroxyethylidene diphosphonate; the silicate is a mixture of one or several of methyl silicate sodium, vinyl silicate sodium, aminopropyl silicate sodium and polyether organic disilicate sodium; the organic acid is a mixture of one or several of p-tert-butyl benzoic acid, sebacic acid, azelaic acid, phthalic acid, glutaric acid and methyl sulfonic acid; the zinc salt is a mixture of one or both of zinc carbonate and zinc phytate.

2. The temperature controlled liquid composition for intelligent charging pile according to claim 1, characterized in that: The conductivity of the deionized water is less than 0.1 μs / cm.

3. A method for preparing the temperature control liquid composition for intelligent charging pile according to any one of claims 1-2, characterized in that: According to the ratio, the deionized water is added to the alcohol mixture, mechanically stirred at room temperature for 0.5-1 h, heated to 40-50℃, and then the phosphate, silicate and zinc salt are added in turn, mechanically stirred at 40-50℃ for 1.5-2.5 h, and then the organic acid is added, mechanically stirred at room temperature for 0.5-1.5 h, to obtain the temperature control liquid composition for intelligent charging pile.

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