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This paper proposes a method of compensation of the SOC estimation error of the current integration method using the power-off time of the vehicle 

system. The current integration method can derive accurate results in real time with simple algorithm application and low cost. However, a challenge 

arises when errors in the battery's initial values and noise from current measurements accumulate, increasing SOC estimation errors. To solve this 

problem, the time from the vehicle's ignition off to ignition on is regarded as the battery rest time. After a specific rest time, the accumulated error is 

corrected by measuring the open voltage of the battery and correcting the SOC value of the existing current integration method. To verify the 

proposed method a Battery Monitoring System (BMS) that can measure the amount of current change in real time is configured and the accuracy of 

the estimation method is verified by performing battery changing and discharging experiments.