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Evaluation and comparison of two approaches to capture the electrical behaviour of battery cells
Citation key ZIESE2020101463
Author Johann Ziese and Marcel Franke and Julia Kowal
Pages 101463
Year 2020
ISSN 2352-152X
DOI https://doi.org/10.1016/j.est.2020.101463
Journal Journal of Energy Storage
Volume 30
Abstract This paper presents a comparison of two models to predict the electrical behaviour of a lithium titanate (LTO), a lithium iron phosphate (LFP) and a lead acid cell. One model is based on a an equivalent circuit (ECM) and the other one is based on the Shepherd equation. The models are compared by evaluating constant current charge/discharge curves and dynamic characteristics of a typical photovoltaic (PV) scenario. The results show that the lead acid cell is better modelled using a Shepherd style model due to its different charge/discharge characteristics. The lithium-ion technologies are better represented by an ECM due to only minor deviation in charge/discharge parameters. Overall the ECM is better suited for depicting the dynamic behaviour of cells while the Shepherd model is more accurate in static charge/discharge curves and where cell characteristics differentiate between charge and discharge.
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