Gm Global Technolgoy Operations, Inc.

Jeffrey A Tymitz

James D Hendrickson

A system for assessing health of a cell group within a module of a battery pack includes a controller having a processor and tangible, non-transitory memory on which instructions are recorded. One or more sensors are configured to obtain a series of respective average cell group voltages at different stages. The controller is adapted to obtain a measured voltage (V) of the cell group at a calibration event occurring after the third stage. The controller is adapted to calculate a predicted voltage (V) of the cell group based in part on a sum of a disparity factor (&#x394;V) and a third stage cell group voltage (V). The cell group is controlled based at least partially on a difference between the measured voltage (V) and the predicted voltage (V).

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Bruce Township, MI, United States of America

Jeffrey A Tymitz