Method and device for detecting battery cell states and battery cell parameters

A device for detecting battery cell states and/or battery cell parameters of at least one battery cell, comprising:

• a dual Kalman filter, in communication with the control unit, which includes a state estimator for estimating battery cell states and a parameter estimator for estimating battery cell parameters;
• and
• a determination unit which is arranged to determine noise components of the state estimator and of the parameter estimator on the basis of a stored characteristic parameter behaviour of the battery cell in relation to at least one battery cell state in dependence upon a change in the battery cell state over time or in dependence upon a read-out parameter behaviour in relation to at least one battery cell parameter,
• wherein the dual Kalman filter is arranged to adapt the batter cell states and the battery cell parameters automatically to a pre-determined battery model of the battery cell on the basis of the noise components determined by the determination unit,
• wherein the determined noise components include a process noise and a measurement noise, wherein the process noise includes a process noise of the battery cell parameters and/or a process noise of the battery cell states,
• wherein the process noise of the battery cell parameters is determined in dependence upon its read-out characteristic parameter behaviour in relation to the battery cell states and in dependence upon a change in the battery cell state over time,
• wherein the process noise of the battery cell states is determined in dependence upon its read-out parameter behaviour in relation to at least one battery cell parameter, and
• wherein the adapted battery cell states and the battery cell parameters of the battery cell are output to the control unit which is operated to control a load connected to the battery cell and/or a current source connected to the battery cell in response to the adapted battery cell states and the battery cell parameters.