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Electrolyte based Equivalent Circuit Model of Lithium ion Batteries for Intermittent Load Applications

Electric Vehicles have been leading the transportation electrification revolution for the past decade. Lithium ion batteries are at the heart of this resurgence as they are inexpensive, energy dense and posses low self discharge. Precise estimation of critical battery parameters such as State-of-Charge (SOC), State-of-Energy (SOE) & State-of-Power (SOP) of these batteries rely on available equivalent electric circuits. This equivalent circuit modelling technique helps to equate the electric behaviour of the cell with its material properties. Usage of lumped approximate equivalent circuit models are undesirable as they fail to capture the overall transient dynamics of the cell. This paper presents the Single Particle Model which accounts for electrolyte behaviour. This model was validated by intermittent discharge scenario at 1 C rates. This model will enable functional energy management strategies for dynamic changes in the load.