Patent ID: 8283894
Filing Date: 2012-10-09
Classification: G01R

Abstract:
1. A voltage measuring apparatus for measuring an output voltage of an assembled battery in which a plurality of unit cells are connected in series, the voltage measuring apparatus comprising: block voltage detection sections, each section measuring a voltage of each block of a plurality of blocks into which the plurality of unit cells are divided; a reference voltage output section provided in each of the voltage detection sections to output a reference voltage; a difference voltage calculating section which is adapted to calculate a difference voltage between a measured value of the reference voltage measured by one of the block voltage detection sections and a measured value of the reference voltage measured by another of the block voltage detection sections; a difference voltage determination section which is adapted to determine whether each of the difference voltages exceeds a given threshold voltage or not; and an abnormality determination section which is adapted to determine that abnormality occurs in the voltage measuring apparatus when at least one of the difference voltages is determined as greater than the threshold voltage.