Battery Monitoring System

摘要

A battery monitoring system, comprises a battery state detection circuit that detects battery states of a plurality of battery cells that are connected in series, based on respective cell voltages of the plurality of battery cells, and a control circuit that monitors state of a battery cell, based on each cell voltage of the plurality of battery cells. The control circuit inputs pseudo voltage information to the battery state detection circuit, and thereby diagnoses whether or not the battery state detection circuit is operating normally.

主权项

1. A battery monitoring device, comprising:
a selection circuit that has a plurality of input terminals provided in correspondence with a positive electrode and a negative electrode of each of a plurality of battery cells that are electrically connected in series, selects input terminals that correspond to a positive electrode and a negative electrode of a battery cell that is to be the subject of measurement, and outputs potentials, that are respectively inputted to the selected input terminals, of the positive electrode and the negative electrode of the battery cell that is to be the subject of measurement; a voltage measurement circuit, to which the potentials outputted from the selection circuit are inputted, that measures a battery cell voltage that is to be the subject of measurement based on the potentials that are inputted; a current source that is used for inputting a potential to the input terminals that are selected by the selection circuit in order that a voltage that is measured by the voltage measurement circuit is to be different from the voltage of the battery cell; and a control circuit that monitors a state of the battery cell based on the voltage that is measured by the voltage measurement circuit, wherein: in case that a voltage measurement for diagnosing whether or not a selection by the selection circuit is performed correctly is executed; a potential when using the current source is inputted to the input terminals that are selected by the selection circuit, the selection circuit outputs the potential to the voltage measurement circuit, and the voltage measurement circuit measures a voltage that is different from the battery cell voltage; and the control circuit diagnoses whether or not the selection by the selection circuit is performed correctly based on the voltage, that is different from the battery cell voltage, measured by the voltage measurement circuit.