To solve the problem of performance degradation in automotive lithium-ion batteries at low tempera-tures,a self-heating method based on electric vehicle traction motor and inverter reconfiguration was developed,in which the traction motor windings were utilized as energy storage units to realize AC heating of batteries at low temperatures without additional hardware.First,a detailed mathematical description of AC heating topology was given,and the analytical relationship among the battery voltage,current and heating control parameters was obtained.Then,an adaptive fuzzy PI controller was designed to regulate both the heating current and the charge/discharge voltages of batteries dynamically,so that the heating rate can be guaranteed while avoiding the aging of batteries.In addition,in order to relieve the mechanical vibration and noise from the traction motor during internal heating,a torque ripple canceling scheme based on the clamped rotor position was also proposed,thus ensuring the passenger comfort and the motor durability.Experimental results demonstrate that under the proposed strategy,the tested batteries warmed up from-20 ℃ to above 0 ℃ within 403 s without permanently damaging the battery life.
关键词
电动汽车/锂离子电池/交流自加热/驱动电机
Key words
Electric vehicle/lithium-ion battery/AC self-heating/traction motor
维普
万方数据