Gm Global Technolgoy Operations, Inc.

Alexander K Suttman

Patrick Frost

Rory B Fraga

Patricia M Laskowsky

A method of adjusting battery control software for a battery having a plurality of battery sections includes connecting the battery to a charging system and a discharging system. A charging operation or a discharging operation is then initiated while monitoring a voltage response of each battery segment during the charging operation or the discharging operation. The voltage response is then correlated to a calibration database for selecting a control algorithm for each battery segment from the calibration database.

Method for determining characteristics of battery segments for operating a battery pack with modules of different chemical makeup field

A method for estimating battery power capability in a torque-generating system having a battery pack with battery cells includes calculating a voltage spread as a difference between an average and minimum cell voltage of the battery pack. The method also includes increasing a calibrated voltage control limit by an offset that is based on a magnitude of the voltage spread, doing so when the minimum cell voltage is less than the control limit, and recording the offset in a memory location referenced by pack operating conditions. Further, the power capability is estimated using the recorded offset when the battery pack operates under conditions that are the same as the operating conditions, and then executing a control action of the system using the estimated power capability. A torque-generating system includes the battery pack, an electric machine, and a controller programmed to execute the above-described method.

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West Bloomfield, MI, United States of America

Alexander K Suttman