【摘要】 动力电池功率密度是辅助车辆系统和电池包设计的基本数据。本文采用日本JEVS和美国FreedomCAR项目中的功率密度测试方法,以8.5 Ah/12 V(美国)和5.5 Ah/3.6 V(日本)等动力电池作为研究对象,对影响功率密度测试结果的因素进行比较分析。研究表明:在不同的测试评价方法中,由于内阻确定方法不同,导致计算得到的动力电池功率密度存在较大差异;JEVS法采用0~10C"系列"充电或放电电流下的电压响应特性表征电池功率能力,可避免单一电流造成的结果偏差,但没有考虑高倍率充电或放电电流下电池功率能力变化;HPPC法兼顾中低倍率及高倍率充电或放电电流下的电压响应特性,但采用某一电流表征电池功率能力会有单一电流造成的结果偏差问题。更多还原

【Abstract】 Power density of the batteries is an essential parameter for designing vehicle auxiliary system and battery pack.Influence factors of the tested results on power density of the batteries were compared and analyzed by the methods of JEVS and HPPC and the battery A with 8.5 Ah/12 V made in US,the battery B with 5.5 Ah/3.6 V made in Japan.The studied results show that larger difference of the calculated power density of the battery exists in the different testing methods,caused by the different ways of determining internal resistance;the battery power capacity is characterized by the voltage response characteristics at charge/discharge currents of 0-10C series based on the JEVC method,which avoids the result’s deviation caused by single current but doesn’t consider the variation of the capacity at the high magnification currents;the capacity is characterized by the voltage response characteristic at a certain current based on the HPPC method,which compromises the voltage response characteristics at the middle-low and high magnification currents but doesn’t avoid the result’s deviation of the capacity at a certain current.更多还原