动力锂电池大倍率放电时内外部温度场的研究

Research of internal and external temperature field of lithium power battery discharged at high rate

利用数值模拟的方法建立了3.2 V/50 Ah LiFePO_4动力电池放电过程的电热耦合模型,研究其在自然环境中不同放电倍率条件下的内外部温度分布。并且为验证模拟结果的准确性,比较了模拟所得数据与实验所得数据的一致性。结果显示:模拟所得温度与实验测得温度最大的偏差小于1℃;放电过程中,电池内部中心区域的温度最高,正负极极柱上的温度最低,温度场不均匀性随着放电倍率的增大而增加。

The electro-thermal coupling model in the discharge process of 3.2 V/50 Ah LiFePO, power battery was established by using numerical simulation method to study the internal and external temperature field of the power battery discharged at various rates. Meanwhile, for verifying the accuracy of simulation results, the consistency of the data from simulation and experiment was compared. The results show that the maximum deviation between the experimental temperature and simulation temperature is less than 1 ℃; in the discharge process, the highest temperature is in the central regions of the internal battery, and the lowest temperature is on the positive and negative pole; the inhomogeneity of the temperature field increases with the increase of discharge rate.