Patent ID: 11970077
Assignee: DAIMLER AG
Field: Measurement (Instruments)
Classification: CPC B  G  Y | IPC B  G

Claim 3:
4. A device for determining a cell voltage of a battery cell of a traction battery of a vehicle, comprising:
a first sensor, wherein the first sensor detects the cell voltage;
a filtering device, wherein the filtering device filters the detected cell voltage;
an analogue to digital converter, wherein the analogue to digital converter samples the filtered cell voltage and transfers the filtered and sampled cell voltage as a cell voltage signal to a computing device;
wherein the computing device evaluates the cell voltage signal; and
a second sensor, wherein the second sensor determines a total voltage of the traction battery;
wherein the computing device evaluates the cell voltage signal depending on the ripple value;
wherein a voltage ripple of the total voltage is determined and wherein the voltage ripple of the total voltage is scaled for the battery cell by dividing the voltage ripple of the total voltage by a number of battery cells switched in series to obtain a result and then adding the result to a detected maximum cell voltage of the battery cell.