Method for determining parameter values of a model of an electrochemical cell of a battery cell in a battery of a motor vehicle as well as control device and motor vehicle battery

摘要

The invention relates to a method for determining parameter values (25) of a model (10) of an electrochemical cell (21) of a switchable battery cell (18) in a battery (12) of a motor vehicle (11), the switchable battery cell (18) at least one Has switching element (A, B, C). The invention provides that the respective switching element (A, B, C) is switched by a control device (24) according to a predetermined switching function (G) and, by means of the switching, a temporal excitation curve (27) of a current intensity specified by the switching function (G) of a cell current (I) of the electrochemical cell (21) is changed, the excitation curve (27) simultaneously having frequency components at several excitation frequencies (f), and by means of a measuring device (29) of the battery cell (21) a time response curve (28) of an electrical Cell voltage (U) of the electrochemical cell (21) is detected and the parameter values (25) are determined from the excitation curve (27) and the response curve (28) by means of a predetermined calculation rule (F).