锂离子电池电-热耦合模型分析及其温度场仿真研究

Analysis of electro-thermal model and simulation on temperature field for lithium-ion battery

中文关键词: 电流密度  电-热耦合模型  温度场

英文关键词: current density  electro-thermal model  temperature field

中文摘要:

      锂离子电池由于放电过程产生大量的热，不可避免的使得电池温度升高。研究大倍率放电时的电池温升，忽略电化学反应热，进一步简化原有的生热模型。为了得到电池温度分布，从电池内部结构出发，根据电流密度在集流板上的分布以及极耳处的收缩/扩散效应，分析集流板上电流密度的分布规律，从而建立电池的电-热耦合模型。通过生热模型模拟电池放电过程的温升现象，并与实验结果对比，发现模拟结果与实验结果能够很好地吻合。文章给出了电池在不同放电倍率条件下放电终了时的温度分布图，并解释了造成这种分布现象的原因。

英文摘要:

      Li-ion battery generates lots of heat during the discharge process resulting in inevitable temperature rise. The electrochemical heat could be ignored at high discharge rate, so the heat model can be simplified. In order to obtain the distribution of temperature, the inner construction of battery should be studied. By study of the current density in the current collector and the current shrink/diffusion effect near the tab, current distribution in the current collector is visible, so the electro-thermal model of battery can be established. The discharge process was simulated by the electro-thermal model, and the result is parallel to the date. In the end, the simulation images of temperature distribution of battery is showed at the end of discharge, and the temperature distribution phenomenon is discussed.