纯电动汽车不同行驶工况下电池组的温升研究  

Temperature Study of Pure Electric Vehicles Battery Pack at Different Driving Conditions

作　　者：李仲兴[1] 李颖[1] 周孔亢[1] 盘朝奉[1] 何志刚[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《机械工程学报》2014年第16期180-185,共6页Journal of Mechanical Engineering

摘　　要：为研究纯电动汽车以不同工况行驶时，动力电池组的温升状况，以某微型纯电动车用磷酸铁锂动力电池组为研究对象，根据能量守恒定律和傅里叶定律，建立电池组导热的数学模型及有限元模型。利用 FLUENT 软件仿真纯电动汽车在水平路面上以不同车速匀速行驶时，封闭的电池箱内锂离子动力电池组温度分布及周围流场分布。并进行纯电动汽车动力电池组温度场分布实车试验，测得在不同行驶工况下电池组测温点温度的分布，试验和仿真结果相吻合，验证了所建立模型的有效性，同时确定了电动汽车不同行驶速度与电池组温升的影响。在试验验证仿真正确性的基础上，仿真分析环境温度和道路坡度对纯电动汽车用锂离子动力电池组的温升影响，得出环境温度为20～30℃时电池组工作性能最优，且电动汽车行驶的道路坡度对电池组的温升影响较大。The LiFePO4 battery pack are taken as an example for the study temperature of pure electric vehicles battery pack at different driving conditions. Based on the Fourier’s law and the law of conservation of energy, the mathematical and finite element model and thermal conductivity of the battery pack are developed. By using FLUENT, the temperature distribution and the distribution of the flowing field of lithium-ion battery pack in a closed box are simulated when electric vehicle running at different constant speeds. Vehicle test is conducted to find the temperature distribution of measuring points in battery pack under different running conditions. The validation of simulation model is testified by proving that there is a good consistence between simulation and test results. Meanwhile, the influence imposed by different running speeds on the rising temperature of battery pack is found. Based on the authenticated simulation model verified by test results, the influence of the ambient temperature and the gradient of the road on rising temperature of lithium-ion battery pack is simulated and analyzed. The optimized operational environment temperature range is obtained as 20-30 ℃. Then the gradient have a great impact on the battery pack’s temperature rise.

关 键 词：锂离子动力电池组 温度场 温差 

分 类 号：U463[机械工程—车辆工程]