Abstract
Lithium-ion polymer batteries are getting popular in both renewable energy systems and electric vehicles thanks to their high power and energy density. Therefore, accurate battery models are vital in design and simulation of hybrid/electric vehicle propulsion systems. In this work a novel equivalent circuit-mathematical battery model whose parameters were extracted from experimental data is proposed. The simulation results were compared with actual results obtained from a series of experiments carried out using an automotive-grade 11 Ah Kokam SLBP lithium-ion polymer battery. The model exhibits consistent behaviour. I. INTRODUCTION While the need for energy is ever increasing worldwide, the amount of fossil fuel deposits is in decline. Following the awareness about environmental pollution and stress caused by fossil fuel consumption as well, the renewable energy technologies have gained momentum. It is inevitable to use batteries for energy storage in these modern systems. Moreover, due to recent legal restrictions on carbon-dioxide emission of vehicles with combustion engines, the use of electric vehicles is expected to become more common. Lithium-Ion-Polymer batteries are getting popular in both renewable energy systems and electric vehicles thanks to their high power and energy density. Therefore, accurate battery models are vital in design and simulation of hybrid/electric vehicle propulsion systems. Modelling batteries is a tedious task because of their complex electrochemical structure and nonlinear characteristics. The criteria for designing a battery model and comparing it with existing models can be summarized as (1): • Accuracy: The compliance of results obtained by the model with actual experimental data.
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