Investigation on the Impact of the HPPC Profile on the Battery ECM Parameters’ Offline Identification

Hybrid Pulse Power Characterization (HPPC) test can provide the input data for the identification of the battery equivalent circuit model (ECM) parameters and is becoming a standard test for offline parameters’ identification. However, the HPPC was originally designed for determining the dynamic power capability of the tested battery using a profile that incorporates both discharge and regen pulses, which is quite different from the parameters’ identification, therefore it is meaningful to make the profile fit the parameters’ identification. Aiming at this, this paper investigates the impact of the different HPPC profile on the identification accuracy from two aspects: the pulse width of the simulating current and the rest time. Firstly, the process of the HPPC test as well as parameters’ identification is given. Then, identification results of the HPPC profile with different pulse width and rest time are compared both by simulation and experiments. The results show that both the pulse width and rest time have a significant impact on the accuracy of the parameters’ identification. If the pulse width and rest time are both small, increasing either of them can improve the identification accuracy significantly, while if the pulse width or the rest time is large enough, the identification accuracy can’t be further improved evidently by prolonging any of them.