Patent ID: 9130248
Filing Date: 2015-09-08
Classification: B60L,G01R,H01M,Y02E,Y02T

Abstract:
1. A method for monitoring performance changes in aging cells in a battery pack, said method comprising: providing full-cell open circuit voltage data vs. time and current data vs. time for a cell in the battery pack, where the data is obtained by sensors during a plug-in charge event; calculating cathode half-cell stoichiometry using the current data and providing cathode concentration data vs. time and cathode half-cell open circuit voltage data vs. time; determining anode half-cell stoichiometry using the cathode concentration data, the cathode half-cell open circuit voltage data and the full-cell open circuit voltage data; and calculating, using a microprocessor, an updated state of charge vs. open circuit voltage curve (SOC-OCV curve) for the cell based on the cathode half-cell stoichiometry, the anode half-cell stoichiometry and a full-cell capacity.