Abstract: The lifetime of power batteries plays an important role in industrialization of hybrid electric vehicles, and the lifetime of power batteries is directly related with heat dispersion. Taking 6.5 A.h/144V Ni-MH battery as the research object, the battery heat mechanism is analyzed, and the heat temperature model of battery is estab lished. Further more, hybrid vehicle nickel metal hydride battery pack thermal performance test rig is built, and the heat dispersion performance of the battery box is studied; meanwhile, the influence of variable current charging or discharging on the battery temperature field is analyzed. The results show that the proposed batteries can satisfy the requirements of battery heat dispersion performance of hybrid vehicle.

Key words: hybrid electric vehicles (HEV), Ni-MH cell;cooling system, temperature field

摘要： 动力电池组的寿命直接影响混合动力汽车产业化,而电池组的寿命与其散热性能直接相关。以6.5A??h/ 144V镍氢电池组为对象,对电池的生热机理进行了分析,建立了电池的生热温度模型,搭建了混合动力汽车镍氢 电池组热性能试验台;对电池箱的散热性能进行了试验研究;分析了变电流充放工况对电池组温度场的影响。试 验结果表明,使用的电池组能够满足混合动力汽车对电池散热性能的要求。

关键词: 混合动力汽车, 镍氢电池, 散热系统, 温度场