Method and control unit for monitoring an energy accumulator

A control unit for an energy accumulator, comprising:

• the control unit, wherein the control unit is configured to:
• detect, during operation of the energy accumulator, event data relating to different discharging/charging events of the energy accumulator, wherein the event data for a discharging/charging event indicate an event discharge depth of the energy accumulator in the context of the discharging/charging event;
• determine a discharge depth distribution on the basis of discharge data that, for different discharge depths, indicates a number of discharging/charging events having a corresponding event discharge depth during the operation of the energy accumulator;
• determine state data relating to a cumulative loading of the energy accumulator on the basis of the discharge depth distribution and on the basis of a discharge depth characteristic curve of the energy accumulator, and/or adapt an operating strategy for the energy accumulator depending on the discharge depth distribution and the discharge depth characteristic curve;
• determine a first discharge depth distribution at a first time point of the operation of the energy accumulator;
• determine a second discharge depth distribution at a subsequent second time point of the energy accumulator;
• predict a predicted discharge depth distribution for a future time point on the basis of the first discharge depth distribution and the second discharge depth distribution;
• and
• determine the state data on the basis of the predicted discharge depth distribution and/or adapt the operating strategy of the energy accumulator on the basis of the predicted discharge depth distribution.