Patent ID: 6803766
Filing Date: 2004-10-12
Classification: B60L,G01R,Y02T

Abstract:
A battery pack voltage detection apparatus for detecting a voltage of a battery pack having first and second battery blocks connected in series, each battery block including a plurality of battery cells connected in series, the battery pack voltage detection apparatus comprising:a voltage detection circuit; a series capacitor circuit including a plurality of capacitors connected in series, the number of which is equal to the number of cells of the battery block; an input analog switch group that connects a terminal of each cell of the first battery block to a terminal of each capacitor individually so that each capacitor is charged by each cell of the first battery block individually, and that connects a terminal of each cell of the second battery block located on a low potential side with respect to the first battery block to a terminal of each capacitor in a potentially reverse order to the terminal of the first battery block; and an output analog switch group that connects the terminal of each capacitor to the input terminal of the voltage detection circuit separately.