VEHICLE SYSTEM, BATTERY SYSTEM AND CONTROL METHOD THEREOF

A battery system is provided. The system includes a battery and a sensor unit having a voltage sensor that detects a voltage of the battery and a current sensor that detects a charging and discharging current of the battery. A power relay assembly of the system includes a main relay that connects between the battery and a vehicle system. Additionally, a battery management system (BMS) applies different diagnostic error code confirm conditions to the voltage sensor and the current sensor when a multi-error of the voltage sensor and the current sensor is detected.