基于有限元分析方法,利用ANSYS软件,建立了10 Ah立方形锂离子单体电池的热模型,并验证了模型的可行性,在此基础上建立了4×4锂离子电池组的热模型,并研究了其在过充条件下的热效应,分析了电池组的生热规律.结果表明:实验和模拟测得的单体电池表面中心的温度最大差值为2.4℃,验证了模型的可行性;锂离子单体电池的上表面温度明显高于其他表面,正极柱的温度高于负极柱;电池组的最高温度出现在电池组的几何中心;过充倍率越大,电池的温度升高速率越大,热不均衡性也越大;在相同的充电倍率下,相比于单体电池,电池组的温度升高速率更大,温差更大,热不均衡性更明显.%Based on the finite element analysis method,the thermal model of 10Ah cubic lithium-ion battery was built by ANSYS software,and the feasibility of the model was verified. On this basis,the thermal model of 4 × 4 lithium ion battery pack was built and the thermal effect of the battery pack was analyzed. The results showed that the maximum surface center temperature difference of the single cell between model and experience was 2. 4℃,and the feasibility of the model was verified. The upper surface temperature of the lithium ion cell was significantly higher than that of the other surface. In the negative pole,the highest temperature of the battery pack appeared in the geometric center of the battery. The greater the overcharge current rate,the greater the rate of the temperature rise and the greater the thermal imbalance. At the same current,the battery pack temperature rise rate and tempera-ture difference were greater than single cell,and thermal imbalance was more obvious.
展开▼
