Experimental Analysis of Operating Time Improvement of Fast Charging Power Device with Composite Phase Change Materials

Abstract

An innovative hybrid thermal control system is proposed to improve the operating time of fast charging power device. It is demonstrated that the maximum operating time of the power device improves significantly with the CPCM coating, and the effects of the phase transition temperature, covering thickness, and thermal conductivity of CPCM on the power consumption of the cooling system are studied. The operating time extends by 910 s after adding CPCM at the heat flux of 2.7 MW/m3, and the ECR of the cooling system decreases by 81.99 %. Increasing the liquid flow rate or decreasing the initial water temperature extends the operating time of the power device. An improvement in the operating time about 6.9 times higher than the single liquid cooling after adding the CPCM with a phase transition temperature of 52 ℃. Increasing the CPCM thermal conductivity from 6.05 W/(m⋅K) to 8.99 W/(m⋅K) extends the operating time of the power device from 1110 s to 1560 s, and a decrease from 0.428 W/h to 0.305 W/h for the ECR of the cooling system is also found. Increasing the CPCM covering thickness from 3 mm to 7 mm extends the operating time from 1110 s to 1230 s.

Keywords: Fast charging pile, Composite phase change material, Thermal control, Operating time, Temperature difference