Method for determining the state of charge of an energy storage device

摘要

The method involves monitoring the charging voltage, and determining a time period with a substantially constant charging voltage. The charging current gradient and the charging current in the time period are determined with the substantially constant charging voltage. The charge state values of the energy storage device (10) is determined from the calibration curves of the charging current gradient and the charging current. A minimum value is generated from the determined charge state values as the charging state of the energy storage device. An independent claim is included for a control device for determining the state of charge of an energy storage device during charging of the energy storage device.