Patent ID: 11951866
Assignee: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  G  H  Y | IPC B  G  H

Claim 15:
16. A device configured to determine an operating temperature of a battery cell, the device comprising:
an impedance measuring apparatus configured to measure an electrical impedance of the battery cell;
a temperature sensor configured to measure a measured temperature exterior and adjacent to the battery cell; and
a control unit configured to:
determine an external temperature of the battery cell from the measured temperature,
determine an internal temperature of the battery cell by detecting the electrical impedance of the battery cell, and
determine an operating temperature of the battery cell from at least one of: the external temperature and the internal temperature,
wherein, in a first operating state of the battery cell, the internal temperature of the battery cell is determined:
at a first frequency, if a temperature profile of the battery cell is in a predefined first safe range, and
at a second frequency greater than the first frequency, if the temperature profile of the battery cell is outside the predefined first safe range, and

wherein the temperature profile reflects at least one of: the external temperature, the internal temperature and the operating temperature, of the battery cell.