Patent ID: 7696727
Filing Date: 2010-04-13
Classification: G01R

Abstract:
1. An apparatus for measuring an amount of current in battery cells, the apparatus comprising: a plurality of resistors connected in parallel and installed on a current flow line connected to the battery cells; a plurality of switches connected to the plurality of resistors respectively, and switching on/off the current from the battery cells to each of the plurality of switches; a multiplexer outputting a switching signal to each of the plurality of switches; a main chip controlling the operation of the multiplexer, the main chip being connected to both ends of each resistor of the plurality of resistors, and integrating current flowing in switched-on resistor (s) over time and calculating a total current from the integrated current and increasing a number of resistors of the plurality of resistors having current flowing therethrough by controlling the multiplexer according to a level increase of the current.