US 12,463,265 B2
Battery monitoring system for measuring carbon dioxide to detect imbalance in a group of parallel lithium-ion battery cells
Michelle H. Wiebenga, Farmington Hills, MI (US); Lei Wang, Rochester Hills, MI (US); and Rasoul Salehi, Ann Arbor, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Dec. 1, 2022, as Appl. No. 18/073,000.
Prior Publication US 2024/0186598 A1, Jun. 6, 2024
Int. Cl. H01M 10/48 (2006.01); G01N 33/00 (2006.01); G01R 31/396 (2019.01); H01M 10/42 (2006.01); H01M 50/317 (2021.01); H02J 7/00 (2006.01)
CPC H01M 10/48 (2013.01) [G01N 33/004 (2013.01); G01R 31/396 (2019.01); H01M 10/425 (2013.01); H01M 50/317 (2021.01); H02J 7/0048 (2020.01); H02J 7/00719 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A battery monitoring system comprising:
a carbon dioxide sensing system configured to selectively measure carbon dioxide concentrations within a plurality of battery cells, respectively, that are connected in parallel; and
a controller configured to detect cathode overpotential in the plurality of battery cells in response to the measured carbon dioxide concentrations of the plurality of battery cells;
wherein the controller is configured to:
cause the carbon dioxide sensing system to measure a plurality of carbon dioxide concentrations of the plurality of battery cells, respectively;
detect cathode overpotential when a difference between at least one of the plurality of carbon dioxide concentrations of the plurality of battery cells and an average carbon dioxide concentration of others of the plurality of battery cells is greater than a predetermined threshold; and
alter at least one of charging or discharging parameters of the plurality of battery cells in response to detecting the cathode overpotential.