CPC G01R 31/388 (2019.01) [H02J 7/0048 (2020.01)] | 7 Claims |
1. A method for ascertaining the state of charge of an electrical energy storage unit (41), the method comprising the steps of:
a) ascertaining a voltage gradient at least based on a detected first voltage value of the electrical energy storage unit;
b) comparing the ascertained voltage gradient with a predefined voltage gradient threshold value;
c) ascertaining a period of time in which the electrical energy storage unit (41) is in disuse based on an absolute value of a drawn and/or output a current falling below a no-load current threshold value in terms of absolute value; and
d) ascertaining the state of charge of the electrical energy storage unit (41) based on the comparison and the period of time.
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