Experimental Analysis on the Thermal Characteristics of the Lithium-ion Battery During the Aging Cycles

Yong Tian, Zhibing Zeng, Xiaoyu Li, Lijuan Xiang, Jindong Tian
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Abstract

This paper investigates the thermal characteristic and heat generation mechanism of the lithium-ion battery during the aging cycles. The surface temperature distribution and the thermal characteristic of the battery were analyzed based on the infrared images. Results indicated that the surface temperature distribution of the battery is greatly dependent on the state of charge (SOC). The endothermic peak caused by the entropy heat coefficient of the reversible reaction heat gradually disappears as the increase of the discharge rate. The negative electrode has the highest temperature during the discharge process. The temperature rise of the battery gets higher as the battery ages, that is, the total heat output of the battery increases. However, the reversible reaction heat of the battery has little change with the increase of the aging cycles. The results of thermal behaviors analysis are conducive to understand the safety management and build a reliable thermal model for high energy density lithium-ion battery.
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锂离子电池老化循环热特性的实验分析
研究了锂离子电池在老化循环过程中的热特性和产热机理。基于红外图像分析了电池的表面温度分布和热特性。结果表明,电池的表面温度分布与荷电状态(SOC)有很大关系。可逆反应热的熵热系数引起的吸热峰随着流量的增加逐渐消失。在放电过程中,负极的温度最高。随着电池的老化,电池的温升越来越高,即电池的总发热量增加。而随着老化循环次数的增加,电池的可逆反应热变化不大。热行为分析结果有助于理解高能量密度锂离子电池的安全管理,建立可靠的热模型。
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