Method for diagnosing battery condition

摘要

A method for diagnosing the general condition of a battery module in a string of such modules (321) comprising a battery pack monitors voltage (V), current (I) and temperatures (T) of the modules and battery pack (321). Accumulators account for various charge quantities including charge out (Qout) and net charge used (Qused) for the battery pack as well as discharge period durations (tdrive). State of charge is provided by appropriate means and used to update module capacities (Qmod). The various charge and time accumulators are used to derive depth of discharge and discharge rate information providing inputs to predetermined functions for determining a simple scalar outputs directly indicative of the general condition of the modules.