A Battery Capacity Estimation Method Using Surface Temperature Change under Constant-current Charge Scenario

Accurate estimation of the actual battery capacity is crucial for a reliable battery management system. In this paper, the battery capacity is estimated based on the battery surface temperature change under the constant-current scenario. Firstly, the change of the battery surface temperature, which is equivalent to the area under the differential thermal voltammetry curve, over a specific voltage range is introduced as a direct feature of interest to reflect the actual battery capacity. Then, the temperature variation curve transformation is utilized to reduce the influence of the initial battery inconsistency. Lastly, the proposed method is validated based on eight groups of battery aging data from the Oxford battery degradation dataset. With the proposed method, the established reference correlation based on one battery can be applied to other batteries with a satisfying accuracy.