Extremely Fast Heating Method of the Lithium-ion Battery at Cold Climate for Electric Vehicle

doi:10.3901/JME.2021.04.113

Abstract

Abstract: The environmental adaptability, especially the limited low temperature performance, of power battery severely restricts the safe, durable, efficient and long-range operation for new energy vehicles in high and cold regions. In order to resolve the technique problem of battery low-temperature preheating, an electric triggered extremely fast heating(XFH) method based on the short-time large current self-discharge is presented. For 18650 lithium-ion battery, the characteristics of battery heat generation and temperature rise in the XFH process are analyzed. Furthermore, to achieve the accurate heating effect, an XFH control strategy is proposed based on the battery temperature prediction. The battery heating performance is simulated by COMSOL simulation system, and then a test platform including the XFH prototype is developed. The test results show that the presented method can achieve the instantaneous heating rate as fast as 0.65 ℃/s and only takes 87 s to heat the battery from -20 ℃ to 20 ℃. The control error of the target temperature is only 0.4% and the heating method has little effect on the aging of battery. The standard deviation of temperature rise is less than 2.7 ℃ when heating the battery module. Finally, the application prospect of the presented heating method, the scientific problems needed to be further solved, and the research route are discussed.

Key words: electric vehicles, lithium-ion battery, extremely fast heating(XFH), thermal management

CLC Number:

TM912

CHEN Zeyu, XIONG Rui, LI Shijie, ZHANG Bo. Extremely Fast Heating Method of the Lithium-ion Battery at Cold Climate for Electric Vehicle[J]. Journal of Mechanical Engineering, 2021, 57(4): 113-120.

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