Simulation of lithium-ion batteries from a electric vehicle perspective

Abstract

Electricity as an energy vector for vehicle propulsion offers the possibility to substitute oil with a wide diversity of primary energy sources. This could ensure security of energy supply and a broad use of renewable and carbon-free energy sources in the transport sector which could help the European Union targets on carbon-dioxide emissions reduction. Electric cars and hybrid cars contain roughly the same type of traction batteries. A lithium-ion battery or Li-ion battery is a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging. Lithium-ion batteries use an intercalated lithium compound as one electrode material, compared to the metallic lithium used in a non-rechargeable lithium battery. This paper simulation a model of a lithium battery pack. For electric vehicles, the driver needs to know how much he will travel before the vehicle's batteries require a recharge. This paper expands upon the general structure of the typical cell electrical equivalent circuit model presented in prior literature. The paper show a practical method for evaluating the electrical equivalent circuit parameters using pulse discharge experimental data to create lookup tables with cell temperature and SOC as independent variables.