DISPOSITIF DE SURVEILLANCE DE BATTERIE ET DISPOSITIF DE SURVEILLANCE DE SYSTÈME DE BATTERIES

摘要

A battery monitoring device for monitoring a cell group made by connecting a plurality of single battery cells in series includes a first switching circuit configured to select, as a measurement target voltage, any one of a plurality of types of voltages including the cell voltages of the single battery cells in the cell group, a differential amplifier circuit including a first input terminal and a second input terminal, and configured to convert the measurement target voltage, which is selected by the first switching circuit and input to between the first input terminal and the second input terminal, into a voltage in a predetermined range by performing differential amplification, and an AD converter configured to measure the measurement target voltage which is selected by the first switching circuit and converted by the differential amplifier circuit, and output a digital signal according to the measurement result, wherein an abnormality detection voltage, with which abnormality in a differential amplification characteristic of the differential amplifier circuit is detected, is output to the AD converter.