US Patent 10120033 Battery sensor and battery monitoring system

A battery monitoring system includes a battery sensor mounted between a plurality of batteries in a battery system for a vehicle using the plurality of batteries. The battery sensor according to an aspect of the present invention, which uses an ammeter resistor connected in series between a first battery and a second battery, includes: a first integrated circuit configured to receive voltages of both electrodes of the first battery and voltages of both terminals of the ammeter resistor to measure a first battery voltage and a one-directional current of the first and second batteries; and a second integrated circuit configured to receive voltages of both electrodes of the second battery to measure a second battery voltage, and receive the first battery voltage and the one-directional current of the first and second batteries from the first integrated circuit through a serial communication interface.