超级电容器恒流充放电热行为分析

Thermal behavior analysis of supercapacitor under constant current charge and discharge

超级电容器在循环充放电过程中,内部核心区是产热区域,实时监控核心区温度变化有着重大的意义。建立超级电容器电化学热耦合模型,通过有限元仿真软件结合实验验证产热模型的准确性,分析了超级电容器在不同电流、环境温度、循环次数对内部核心区温升的影响。结果表明:10 A电流循环充放电5次,核心区温度达到68℃;环境温度越高温度曲线波动越平缓,环境温度每上升10℃,内部核心区温升大约8℃;2 A电流循环充放电40次,内部温度温升分为迅速、缓慢和趋于稳定三个阶段,最后温度维持在41.4℃。

During the charging and discharging process of supercapacitors,the inner core area is the heat-producing area,and real-time monitoring of temperature changes in the core area is of great significance.In this paper,the electrochemical thermal coupling model of the supercapacitor was established,and the accuracy of the heat generation model was verified by finite element simulation software combined with experiments.The influence of the supercapacitor on the temperature rise of the inner core area under different currents,ambient temperatures,and cycles was analyzed.The results show that the temperature of the core area reaches 68℃at 10 A after 5 times of charging and discharging;the higher the ambient temperature,the smoother the temperature curve fluctuation,the temperature rise of the inner core area is about 8℃for every 10℃increase in ambient temperature;when the supercapacitor is charged and discharged at 2 A for 40 times,the internal temperature rise is divided into three stages:rapid,slow and stable,and the final temperature is maintained at 41.4℃.