Fuel cell cooling liquid suitable for low-temperature environment and preparation method thereof

Abstract

The invention relates to a fuel cell coolant suitable for a low temperature environment and a preparation method thereof, and relates to the technical field of coolants, the fuel cell coolant comprises the following components by mass: 45-75% of ultrapure water, 20-50% of ethylene glycol, 0.5-2% of a corrosion inhibitor, 0.5-1% of a stabilizer, 0.1-0.5% of an antioxidant, and 0.05-1.5% of an antifoaming agent. The preparation method comprises the following steps: dividing ultrapure water into four parts which are respectively marked as ultrapure water A, ultrapure water B, ultrapure water C and ultrapure water D; the preparation method comprises the following steps: dissolving a stabilizer and an antioxidant in ultrapure water A to obtain a solution A; dissolving a corrosion inhibitor in ultrapure water B to obtain a solution B; dissolving a defoaming agent in ultrapure water C, and uniformly stirring to obtain a solution C; adding the solution A into ethylene glycol, uniformly stirring, adding the solution B, and continuously stirring to obtain a solution D; adding ultrapure water D into the solution D, uniformly stirring, and then adding the solution C until the solution is uniformly dispersed without foam, so as to obtain the fuel cell cooling liquid.

Description

technical field [0001] The present application relates to the technical field of cooling liquid, in particular to a fuel cell cooling liquid suitable for low-temperature environments and a preparation method thereof. Background technique [0002] The fuel cell cooling system is different from the traditional engine cooling system. The coolant needs to flow through the bipolar plate cooling channel of the fuel cell stack, and then flow to the air cooling device through the pipeline. The special use environment requires extremely low conductivity for the coolant. , and with the demand for fuel cell power density in recent years, the bipolar plate material has gradually developed into a thinner and more compact metal material, and the air cooling device is generally made of metal, even if these components have been passivated and anti-corrosion treated, but Ordinary coolants are also difficult to meet the safety requirements of fuel cells in a long-term redox environment. [0...

AI Technical Summary

Problems solved by technology

[0006] Ethylene glycol will be mixed with impurities during the production process, such as aldehydes, ketones, and acids. Acids will contact metals for a long time in a high-temperature environment or increase the risk of corrosion, while the coolant is in a redox environment. The aldehydes and ketones mixed in it are easily oxidized into acids, which accelerates the corrosion of metal parts and causes metal ions to dissolve into the cooling liquid, resulting in an increase in electrical conductivity and directly affecting the life of the cooling liquid.

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