Control of the State-of-Charge of a Li-ion Battery Cell via Reference Governor

Abstract

In this paper, we propose a solution for the control of the state-of-charge of a lithium-ion (Li-ion) battery cell. The aim is to design a control scheme able to charge the battery in a fast way and without violating the battery safety constraints on the different electrochemical parameters of the electrochemical model (ECheM) of the battery. The proposed solution is based on a computationally efficient formulation of the reference governor (RG) which has been designed on the basis of a reduced equivalent-hydraulic model (EHM) of the ECheM. Using appropriate suitable safety margins, the satisfaction of the constraints on the EHM ensures the satisfaction of the constraints of the ECheM. Simulation results obtained on an accurate simulator show that the proposed method, if compared with classical charge strategies, is able to considerably increase the charge performance while ensuring the satisfaction of the constraints.