Polarization Voltage Characteristics of Li-ion Cells Using a Reduced Electrochemical Model
Abstract
Advanced battery management systems (BMS) in electric vehicles (EVs) require immediate and accurate internal information of batteries, such as Li-ion concentration, current distribution, and polarization potential across the electrodes for efficient monitoring, control and utilization. In this paper, an electrochemical model was reduced to sufficiently describe each electrode’s instantaneous dynamics without main information loss and it was validated by an experiment from a high-power LiFePO4-graphite cell used in EVs. Furthermore, in order to better study and accurately improve the model, the polarization voltage characteristics of Li-ion battery is especially investigated A sensitivity analysis of up to 6 parameters was carried out using model simulation A parameter sensitivity matrix was established to describe the parameter sensitivity under constant current discharge condition.
Keywords
electric vehicles (EVs), electrode, polarization voltage, sensitivity analysis
DOI
10.12783/dteees/iceee2018/27864
10.12783/dteees/iceee2018/27864
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