锂离子动力电池低温复合加热方法

Due to the poor charge-discharge performance of lithium-ion batteries and the lithium precipitation during the charging process in cold environment, which may even result in safety accidents, it is necessary and urgent to preheat lithium-ion batteries in subzero temperature. In order to realize the low-temperature rapid heating of lithium-ion battery, a hybrid heating method combining internal heating of AC and external heating of wide-wire metal film is proposed. The temperature rise model of the battery is established to simulate the temperature rise characteristics. Therefore, the verification test of the hybrid heating strategy is carried out. The results show that the hybrid heating method can heat the battery from -20℃ to 5℃ in 471 s. Compared with the AC heating method, the heating rate is increased by 22%, and the heating power consumption is reduced by 23%. Especially for battery pack with large difference in its cell's internal resistance, the method can also improve the consistency of the heating effect, and thus is a feasible low-temperature heating method for the battery system.