Study on the Different Test Methods for Power Density of Power Batteries

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.