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Lithium-ion battery diagnostic and prognostic techniques

United States Patent

November 3, 2009
View the Complete Patent at the US Patent & Trademark Office
Embodiments provide a method and a system for determining cell imbalance condition of a multi-cell battery including a plurality of cell strings. To determine a cell imbalance condition, a charge current is applied to the battery and is monitored during charging. The charging time for each cell string is determined based on the monitor of the charge current. A charge time difference of any two cell strings in the battery is used to determine the cell imbalance condition by comparing with a predetermined acceptable charge time difference for the cell strings.
Singh; Harmohan N. (Rockaway, NJ)
Honeywell International Inc. (Morristown, NJ)
11/ 552,287
October 24, 2006
GOVERNMENT RIGHTS This invention was made with government support under Contract No. DAAD19-01-2-00100 awarded by the United States Army Research Laboratory to the Power and Energy Consortium. The government may have certain rights in the invention.