Graphene slurry modified inorganic low-voltage electric heating coating for power battery

Abstract

The invention provides a graphene slurry modified inorganic low-voltage electric heating coating for a power battery. The coating is a single-component coating and is prepared from inorganic silicateas a binding agent, graphene slurry, graphite, carbon black, silicon carbide and calcined coke as conductive filler and other functional auxiliaries as auxiliary materials. By aiming at solving problems that an automobile is difficult to start, has short mileage and breaks down and the like due to faster capacity reduction of the power battery of the new-energy electric automobile in cold northernarea in winter at present, the power battery is enabled to be in space at a higher temperature and is prevented from being contacted with the cold environment. Water soluble silicate is adopted as film forming matter, graphene with excellent conductivity is adopted, the problem of insufficient conductivity of original carbon based conductive filler is solved, and coating cost is reduced; novel water-based graphene conductive slurry is prepared, dispersity of graphene in the coating is improved, the phenomenon of seeding of original graphene slurry at a later stage is eliminated, heating performance of the low-voltage electric heating coating is further guaranteed, and the coating has broad market prospects.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a graphene slurry-modified inorganic low-voltage electric heating coating for power batteries and a preparation method thereof. Background technique [0002] With the advancement of science and the rapid development of society, new energy vehicles have gradually entered the homes of ordinary people. As the main source of power for new energy electric vehicles, the performance of power batteries will greatly affect the use of electric vehicles. However, the optimal operating temperature of the power battery is 25°C. For every 1°C decrease, the available capacity of the battery will decrease by about 0.8%. After a period of use in a low temperature environment, the starting voltage will be low. Therefore, in winter, especially in the cold north, the temperature will drop to several degrees or even dozens of degrees below zero, and new energy vehicles often encounter phenomena suc...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems such as difficulty in starting, short mileage, breakdown and other problems caused by the rapid decline in electric capacity of power batteries of new energy electric vehicles in winter and cold northern regions, and proposes a graphene slurry modified inorganic low-voltage electric heating for power batteries The coating and its preparation method improve the dispersion of graphene in the coating and improve the low-voltage electric heating performance of the coating

One is to use water-soluble silicate as the film-forming material; the other is to use the excellent conductivity of graphene to improve the insufficient conductivity of the original carbon-based conductive filler and reduce the cost of coating; the third is to prepare a new type of water-based graphene conductive material. Slurry, improve the dispersion of graphene in the coating, overcome the phenomenon of "returning coarse" in the later stage of the original graphene slurry, and further ensure the heating performance of the low-voltage electric heating coating