A mathematical model for a lithium-polymer cell based on a lumped parameter representation of the charge diffusion process

Abstract

This paper proposes a model for Lithium-Polymer batteries with diffusion dynamics through a lumped parameter approach in conjunction with an electrical model. A comparison of the performance of several optimization approaches to identify the model parameters from experimental tests is also conducted. Constant and pulsed current discharge experiments were performed on a set of three battery cells using a programmable DC load. The resulting data sets were used to obtain several model parameters using different optimization approaches. The predicted outputs of a discrete battery model using the parameters estimated by each algorithm were compared against the experimental data. The resulting models had an overall good performance, proving that the chosen modelling approach is applicable to Lithium-Polymer batteries, and that the choice of algorithm to identify the system parameters must be made with care.