Abstract
In new energy vehicles, lithium-ion batteries (LIBs) have been broadly applied. Charging anxiety seriously affects the driving experience of passengers, and the battery's charging procedure is intimately associated to the battery's remaining life and safety performance, especially the lithium precipitation of the negative electrode caused by high power fast charging in low temperature environment, which often triggers the thermal runaway of the LIB. The battery equivalent circuit model (ECM) and thermal model are established in this paper, and the battery charging simulation in low temperature environment is carried out in Matlab/Simulink. The optimal frequency is obtained through Mendeley data, and the pulse current and alternating current (AC) with the optimal frequency are loaded. The simulation results show that compared with constant current (CC) charging, pulse current and AC charging have shorter charging time and better temperature rise effect in low temperature environment.
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