Battery thermal management method and system of electric vehicle during low-temperature charging

Abstract

The invention provides a battery thermal management method and system of an electric vehicle during low-temperature charging. The method comprises the steps of arranging a circulation cooling pipe ona power battery in an encircling way, wherein a heating module and a circulation pump are arranged on the cooling pipe, the heating module is used for heating and warming a cooling liquid in the circulation cooling pipe, and the circulation pump is used for driving the cooling liquid to exchange heat with the power battery; acquiring a temperature of a single battery of the power battery when a charging signal is received, supplying power to the hearting module and the circulation pump through a DCDC converter by the power battery when the temperature of the single battery is smaller than a first temperature threshold, and controlling the heating module and the circulation pump to work by a vehicle controller so that the temperature of the single battery is raised; and controlling a charging relay to be switched off by the vehicle controller if the temperature of the single battery is larger than a second temperature threshold so that a charging pile or a charger charges the power battery, wherein the second temperature threshold is larger than the first temperature threshold. By the method, the charging efficiency of the electric vehicle under a low-temperature environment can beimproved.

Description

Technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery thermal management method and system for low-temperature charging of electric vehicles. Background technique [0002] As people's requirements for energy conservation and environmental protection of automobiles become more and more stringent, electric vehicles have increasingly become an important direction for automobile development. Electric vehicles can make rational use of grid power and other advantages. At present, my country has listed the industrialization of electric vehicles as a new energy vehicle industry plan. [0003] The key bottleneck affecting the industrialization of pure electric vehicles is the power battery. At present, most pure electric vehicle power batteries use lithium-ion power batteries. In low temperature environments, lithium-ion power batteries are highly polarized and have poor charging and discharging characteristics. The polarizatio...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a battery thermal management method and system for low-temperature charging of an electric vehicle, which solves the problem of low charging efficiency of the existing power battery in a low-temperature environment, enables the battery cells in the power battery to be heated evenly, and improves the service life of the power battery , to realize the effective charging of electric vehicles in low temperature environment

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