Abstract
In electric vehicles (EVs) the battery capacity is a key parameter that must be accurately estimated through the service time of the battery. This paper proposes a new machine-learning model namely a Multi-output Convolved Gaussian-Process (MCGP) model for capacity estimation of lithium-ion (Li-ion) battery cells used in an EV application. The proposed technique can be utilized in enhancing the state-of-charge (SOC) estimation accuracy and moreover it can provide an accurate prediction tool for the remaining useful life (RUL) of a battery cell. The performance of the proposed model is validated using experimental data obtained by cycling two 3.6-V/16.5-Ah Li-ion battery cells. Results show the effectiveness of the proposed model.
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