A time-varying transfer function model for modeling the charging process of a Lithium-ion battery

A time-varying transfer function model for Li-ion batteries is introduced in this paper. Because of its time-varying nature, the proposed model is capable of capturing the charging process better than conventional time-invariant transfer function models. The overall modeling process constitutes a three-step process, namely, estimation of a continuous time-varying model, segmentation of the model parameter estimates, and finally representing the overall process by a group of piecewise time-invariant models. The efficacy of the proposed modeling process is demonstrated by using simulated data collected from a good electrical Li-ion battery model.