Improvement of an Equivalent Circuit Model for Li-Ion Batteries Operating at Variable Discharge Conditions

Abstract

A real time simulation of battery conditions is an essential step in the development of energy harvesting devices. Since it is not possible to have a direct measurement, the battery information, such as the remaining charge, need to be estimated by means of model-based estimation algorithms. Most of the existing models describing battery behaviour, are suitable only for a constant discharge current. This paper proposes a study of the dependence of the equivalent circuit model parameters on different discharge conditions. The model presented provides a powerful tool to represent the batteries’ behaviour in energy harvesting systems, involving continuous charge and discharge cycles. The extraction of parameters was performed, starting from a set of reference curves generated in Matlab Simulink environment, referring to Li-ion technology batteries. The parameters were extracted by means of a cascade of global and local search identification algorithms. Finally, the relations describing parameters’ behaviours as functions of the discharge current are presented.

Design of a Low Voltage DC Mini-grid for Isolated Healthcare Centres

“…To achieve 400Ah, 4 Li-ion batteries of 100Ah each can be stringed together in parallel combination. Figure 9 shows the characteristics of a typical 4 V Li-ion battery, and using the study made in Lozito et al [37]. Other commercially available versions of Li-ion batteries also follow similar curves, albeit with a shifted scale.…”