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新能源汽车混合储能系统中超级电容器的热行为研究

夏国廷;朱磊;王凯;李立伟;青岛大学自动化与电气工程学院;

摘要: 超级电容器是一种新型大功率储能元件,具有较高的能量密度,但其性能受温度影响非常大。为了更精确地研究超级电容器的热特性,本文对新能源汽车混合储能系统中的超级电容器进行三维有限元热分析建模,并分析了其内部温度场的分布情况。对串并联等效热阻模型建立温度分布方程,得到超级电容器表面的总换热系数hc和总热流密度q。实验和仿真结果表明,在充放电的初始阶段,每进行一次充放电行为,超级电容器温度上升约0.94℃。经过2A恒流、50次充放电循环后,最高温度出现在核心区域,底部径向温度下降为0.34℃/cm,进入稳态后达到42.6℃。温度影响超级电容器自放电程度,温度越高、初始电压越大,自放电现象越明显。
关键词:混合储能系统;超级电容器;热行为;自放电;

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