大容量软包装锂离子电池放电过程热分析

Thermal behavior of large capacity flexible lithium-ion during discharge

锂离子电池尤其是大容量锂离子电池在放电过程中会产生大量热量,如果不及时进行散热处理会严重影响电池整体的性能,也会产生安全隐患。利用STAR-CCM+软件,以软包装锂离子单体电池为研究对象,建立锂离子电池的传热模型,分析锂离子电池在放电过程中发热量、温度分布等变化规律,并讨论不同对流换热系数对电池温度的影响。

Lithium-ion battery, especially large capacity lithium-ion battery will generate a lot of heat. If the heat cannot be dissipated timely, the whole performance will be seriously affected, and also will cause security hidden danger. Taking the flexible packaging lithium-ion cell as the research subject, the thermal model was presented to analyze heat and temperature distribution of battery during the discharge cycle by STAR-CCM＋ software. Then the influence of the different heat transfer coefficient on the battery temperature was discussed.