New measuring system of transient response of advanced batteries for abrupt load changes

Abstract

A measuring system was constructed for the first time to evaluate the immediate availability of advanced batteries for an electric energy storage system. It was verified that the measuring system can be employed to determine the transient response of advanced batteries for abrupt load changes. Transient response for the charge-discharge (C/D) equipment is discussed. It was found that the transient response of the C/D equipment depends on the operating voltage and also on the internal resistance of the load (battery): the delay time of the output current was less than 100 ms at an operating voltage of between 12.5-63 V; the rise time of an output current was observed to be between 10 and 150 ms for an internal resistance between 10 and 200 m Omega . Second, the transient response of a 10 kW lead-acid battery is discussed. The rise and fall times of the load current were determined to be within 10 and 1 ms respectively with the use of this system. It was verified that the response of a large-scale secondary battery to abrupt load changes is fast enough to use the battery for an electric energy storage system.