Amplitude–Frequency Decoupled Heater and Integrated Strategies for Automotive Batteries Based on Inverter and Motor

逆变器 电池(电) 汽车工程 功率(物理) 电气工程 工程类 材料科学 电压 物理 量子力学
作者
Zhenhao Liu,Furong Liu,Shaohua Lu,Changjun Xie
出处
期刊:IEEE Transactions on Power Electronics [Institute of Electrical and Electronics Engineers]
卷期号:39 (1): 1565-1576
标识
DOI:10.1109/tpel.2023.3316288
摘要

The low-temperature preheating of lithium-ion batteries is an important means for improving their fast charging performances in electric vehicles at low temperatures. In recent years, a trend has emerged towards low-cost, small capacity, and high efficiency heaters, in which a bridge inverter self-heater (BISH) is integrated into the motor inverters. However, the preheating current is limited by the power of the on-board hardware. Heating the battery under low-frequency current can easily lead to lithium precipitation. Both of these result in low heating rates. Therefore, this paper proposes an amplitude frequency decoupled AC heater (AFDH), which can well-balance the rates of the temperature rise and battery degradation. In addition, the heater can also be used to balance the batteries as an on-board equalizer. This paper proposes two integrated topologies for the AFDH based on the motor inverter. Each of the two topologies can increase the preheating current to nearly 2–3 times the rate current of the motor winding. Experimental results show that the AFDH can achieve better temperature rise performance on LIBs.. The temperature rise rate at a -20 ℃, 100 Hz, and 3 C current can reach 3.871 ℃/min and the energy consumption is 5.38%. Moreover, no significant capacity degradation appears after 80 heating cycles with the 3.2 C current, showing good prospects for on-board application.
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