Patent Number: 7,612,540

Title: Lithium-ion battery diagnostic and prognostic techniques

Abstract: 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.

Inventors: Singh; Harmohan N. (Rockaway, NJ)

Assignee: Honeywell International Inc.

International Classification: H02J 7/04 (20060101); H02J 7/00 (20060101); H02J 7/16 (20060101)

Expiration Date: 1/03/02017