Patent ID: 6104164
Filing Date: 2000-08-15
Classification: G01R

Abstract:
A unit cell voltage detecting device for a combination battery consisting of a plurality of unit cells connected in series, the plurality of unit cells being divided into several cell groups, the unit cell voltage detecting device comprising:a plurality of voltage divider circuits each connected to each unit cell, the voltage divider circuit having at least a cell-side resistor connected to a plus terminal of the unit cell and a reference-side resistor connected in series to the cell-side resistor;a plurality of reference potential lines, each connecting a common terminal representing a lowest potential of each cell group to the reference-side resistors of that cell group; anda cell voltage detector for detecting a cell voltage of each unit cell, a high potential side of the cell voltage detector being connected to a junction of the cell-side resistor and the reference-side resistor for receiving a divided potential therefrom, a low potential side of the cell voltage detector being connected to the reference potential line for receiving a reference potential therefrom, wherein:each unit cell voltage is detected based on a potential difference between the divided potential and the reference potential.