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In 2013, the University of Sheffield commissioned a 1 MWh lithium-titanate (LTO) battery energy storage system (BESS), directly connected to the grid through an 11 kV feed. With a view to later on develop a comprehensive model structure for the whole battery pack — key to many online battery management system (BMS) operations — in this paper, an in-depth frequency-domain analysis is performed on one...
A sensitivity analysis for a two time-constant Randies' circuit model to its forming resistor-capacitor elements is presented. The model parameters are identified for a cylindrical lithium-ion iron phosphate cell using the electrochemical impedance spectroscopy technique and a nonlinear least squares approach. Initially, it is shown that the model parameters vary as a function of the battery's state-of-charge...
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