Lithium-ion Battery Cell Modeling with Experiments for Battery Pack Design
Lithium-ion polymer battery has been widely used for onboard energy storage in vehicle electrification ranging from 12V stop-start engine idling elimination, 48V mild hybrid, to 300V battery electric vehicle. Formulation on cell parameters acquired from minimum numbers of experiments, the modeling and simulation becomes an effective approach in predicting battery performance, thermal effectiveness, and degradation. This paper describes the modeling, simulation, and validation of a Lithium-Nickel-Manganese-Cobalt-Oxide (LiNiMnCoO2) based cell with 3.6V nominal voltage and 20Ah capacity. The cell characteristic parameters are acquired from constant current 20A, 40A, 60A, and 80A discharge tests in the computer-controlled cycler and temperature chamber. Discharging voltage curves and cell surface temperature distributions are recorded in each discharging test. A three-dimensional cell model is constructed in the COMSOL Multiphysics environment based on the experimental cell parameters.