Patent ID: 8144024
Filing Date: 2012-03-27
Classification: G01R

Abstract:
1. An apparatus for sensing leakage current of a battery, comprising: a voltage distribution node installed on a first conductive line connecting both terminals of a battery; first and second switches installed respectively between the voltage distribution node and positive and negative terminals of the battery; an insulation resistance and a current sensing resistance subsequently installed on a second conductive line connecting the voltage distribution node to a ground; a DC (Direct Current) voltage applying unit for selectively applying positive or negative DC voltage to a ground-side end of the current sensing resistance to induce a potential difference between the voltage distribution node and the DC voltage applying node; and a leakage current determining unit for sensing a magnitude of an electric current flowing through the current sensing resistance according to the induced potential difference in a turning-on state of the first and second switches, and then determining leakage current by checking whether the magnitude of the electric current is out of a standard level over a threshold value.