The charging and discharging performance of lithium-ion battery at low temperature will decline greatly, which seriously affects the adaptability of electric vehicles at low temperature. This paper proposes to use the inductance characteristic of the motor stator and the switching control characteristic of the motor controller to form pulse current in the battery, and realize the self-heating of the power battery at low temperature. Using this method the heating of the battery can be achieved without any additional hardware or cost. The experimental result shows the average temperature rise rate of the power battery reaches 2.88°C/min. And the influence of different parameters on the heating effect is analyzed through the experiments, including IGBT switching frequency, d-axis voltage, motor-rotor position, and battery internal resistance.

锂离子电池在低温下的充放电性能会大幅下降，严重影响电动汽车的低温适应性。本文提出利用电机定子的电感特性和电机控制器的开关控制特性，在电池中形成脉冲电流，实现动力电池低温自发热。使用这种方法可以在没有任何额外硬件或成本的情况下实现电池的加热。实验结果表明，动力电池的平均温升速率达到2.88℃/min。并通过实验分析了不同参数对加热效果的影响，包括IGBT开关频率、d-轴电压、电机转子位置和电池内阻。