Method and Apparatus for Determining and Fusing an Aging State Trajectory of an Electrical Energy Storage Unit Based on Statistical, Model-Based, and Machine-Learning Methods

A method for determining a trajectory function to represent an aging state trajectory for at least one electrical energy storage unit of one or more devices includes determining uncertainty-containing model values of aging states of the at least one electrical energy storage unit, cleaning error-containing model values of the determined uncertainty-containing model values, determining the aging state trajectory based on the cleaned model values, and determining the trajectory function based on the determined aging state trajectory.