Real-time-capable battery cells simulation

The method involves providing several individual cells that are interconnected with each other, a battery for simulation purpose described by an overall model based on an arithmetic unit, and a first model which models a reference cell (EMK) and with which the terminal voltage of the reference cell is calculated. A second model with which the deviation of terminal voltage of each other cell and the terminal voltage of the reference cell is calculated based on the reference terminal voltage and derived values of terminal voltages of each cell, is provided.