US 12,442,868 B2
Method and apparatus for diagnosing voltage sensors of a device battery having a plurality of battery cells
Christian Simonis, Leonberg (DE); and Christoph Woll, Gerlingen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Aug. 1, 2023, as Appl. No. 18/363,492.
Claims priority of application No. 10 2022 207 963.9 (DE), filed on Aug. 2, 2022.
Prior Publication US 2024/0044997 A1, Feb. 8, 2024
Int. Cl. G01R 31/396 (2019.01); G01R 31/367 (2019.01); G01R 31/3835 (2019.01)
CPC G01R 31/396 (2019.01) [G01R 31/367 (2019.01); G01R 31/3835 (2019.01)] 9 Claims
OG exemplary drawing
 
1. A method for monitoring cell voltage sensors (31) of a battery system (1) comprising a device battery (2) having a plurality of battery cells (21), the method comprising:
continuous monitoring of the device battery (2), via a voltage sensor, to detect, via a battery management system, a faulty cell voltage sensor (31) with a voltage offset above a predetermined threshold;
upon detecting a faulty cell voltage sensor (31), detecting a plurality of voltage offsets at a plurality of evaluation time points;
creation, via the battery management system, of a sensor drift model based on the multiple voltage offsets to determine or predict a voltage offset depending on the calendrical age of the device battery (2);
wherein the voltage offset of a faulty cell voltage sensor (31) is detected by a deviation from a reference cell voltage, wherein the reference cell voltage is determined depending on the sensor drift model.