车载镍氢电池热学模型的建立与试验

Thermal Model and Experimental Investigation of Vehicle mounted Ni MH Power Battery

摘要:

根据现有电池热学模型存在的不足，利用Fluent建立了更为完善的基于耦合传热 (CHT)算法的电池热学模型，并针对所使用的镍氢电池模型确定了各项参数指标.然后通过搭建相关试验平台对该模型的精确性进行了试验验证，二者数据对比表明由热学模型得到的计算结果与试验值具有良好的一致性.最后对镍氢电池的发热量比例分配及随电池负荷状态(SOC)的变化规律进行了分析， 研究结果表明：随着充电电流的增大，焦耳热所占比例从1C(1 A电流)充电时的40%迅速增大到5C充电时的70%以上.

Abstract:

An improved battery thermal model based on coulpled heat transfer(CHT) is established with the Fluent software. All parameters are determined for the nickel metal hydride battery. Then a corresponding test platform is built up to validate the accuracy of the calculated model, and a comparison of the results obtained from the thermal model simulation and the experiment shows that they keep the good consistency with each other. Finally, the quantity proportion of Ni MH battery heat distribution and the variation with SOC are analyzed, the experimental results show that the proportion of Joule heat rapidly increases from 40% to over 70% when charge current increases from 1C to 5C.