Predicting the RF Impedance of Cells in Parallel for Automotive Traction Battery Applications

The impedance of 18650 format cylindrical lithium ion battery cells arranged in parallel using two different configurations has been measured from 100 kHz to 200 MHz using a vector network analyzer. The same configurations have also been simulated using a full-wave 3D field solver. The results indicate that a hybrid simulation approach, which was derived from measurements on a single cell and previously applied to two cells in series with satisfactory results, is equally effective in predicting the properties of parallel cell assemblies.