METHOD AND DEVICE FOR DETERMINING STATE OF HEALTH OF THE BATTERY, AND BATTERY POWER SUPPLY SYSTEM

摘要

The method and the device for determining state of health of the battery, in addition to the power supply system using the device, which can remarkably reduce operational and processing load by expanding the data sampled at the time when the battery is caused to discharge square wave pulses into the square wave is provided. The method of the invention for determining state of health of a battery comprising the steps of: causing the battery to discharge square wave pulses with a prescribed cycle at a prescribed current value; sampling response voltages at a time of a pulse-discharge; expanding sampled response voltages into orthogonal square wave components; dividing an amplitude of the square wave component by the current value of the pulse-discharge to obtain a pseudo-impedance; and determining state of health of the battery based on the pseudo-impedance.