Abstract
In order to estimate the state of health (SOH) of single cell in the electric vehicle power battery pack, this paper researched on t he properties of battery's polarization resistance and ohmic resistance, and then a relative state of health evaluation method which is based on the ohmic resistance was proposed. This method can avoid absolute interference on the battery performance from external such as temperature, working currents and so on, so that it can make the SOH evaluation process more simple, and get the higher accuracy of the evaluation results. Based on the second order RC equivalent circuit model, the dual extended Kalman filtering (DEKF) algorithm was used to estimate the state of charge (SOC) and ohmic resistance online, then according to the relative state of health evaluation method to realize estimate the SOH of each cells in the battery pack online. Finally, the lithium iron phosphate (LiFePO4) battery pack had been tested under different working conditions, the results verified that the proposed method has high accuracy and effectiveness.
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