Patent ID: 7847557
Filing Date: 2010-12-07
Classification: G01R

Abstract:
1. A method of driving a battery management system that estimates an internal impedance of a battery including a plurality of cells, the method comprising: generating a battery equivalent model of the battery; receiving a terminal voltage signal and a charge and discharge current signal of the battery; generating a first discrete signal corresponding to the terminal voltage signal of the battery; generating a second discrete signal corresponding to the charge and discharge current signal of the battery; estimating the internal impedance of the battery by filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model; generating a third discrete signal by filtering the first discrete signal according to the frequency range corresponding to the battery equivalent model; and generating a fourth discrete signal by filtering the second discrete signal according to the frequency range corresponding to the battery equivalent model, wherein the generating of the battery equivalent model comprises: