Patent ID: 10830824

Abstract:
The invention relates to a method and a system for calculating a total state-of-charge of a battery, wherein the method comprises wherein the method comprises calculating the total state-of-charge as a coulomb counting state-of-charge, upon determining that the battery is charging. Determining an off period, which is the time period that the battery has not received charge, upon determining that the battery is no longer charging. calculating the total state-of-charge as a constant state of charge being equal to the coulomb counting state-of-charge, upon determining that the off period is shorter than a first time interval Calculating the state-of-charge as a function of the constant state-of-charge and an open circuit voltage state-of-charge determined by means of the voltage across the poles of the battery, upon determining that the off period is shorter than a second time interval, and that the off period is longer than the first time interval. The method further comprises calculating the total state-of-charge by means of the open circuit voltage state-of-charge, upon determining that the off period is larger than the second time interval.