METHOD AND A DEVICE FOR DETERMINING THE INTERNAL RESISTANCE OF BATTERY CELLS OF A BATTERY

摘要

A method for determining the internal resistance of battery cells includes connecting at least one first decoupled battery module to a battery bank to generate a first voltage during the operation of an electric motor. The battery cells are arranged in battery modules of a battery. The battery is connected to the electric motor. The battery modules are arranged at least one battery bank and the battery modules are configured to connect in series to the battery bank to generate an output voltage of the battery and decouple from the battery bank. The method further includes determining the internal resistance of the first battery module during the connection of the battery module. The method further includes decoupling a predetermined number of second battery modules from the battery bank where the second battery modules generate a second voltage similar to the first voltage within a predetermined tolerance limit.