Estimating method for state of charge of high voltage battery in vehicle

The present invention relates to a method for estimating the state of charge of a high voltage battery in a vehicle. The method for estimating the state of charge of the high voltage battery in the vehicle according to the present invention secures stable driving performance and reduces energy by maximizing the operation efficiency of the vehicle by simply and accurately estimating the state of charge of the high voltage battery. [Reference numerals] (AA,DD) Start; (BB) Calculate a compensation value by the difference between the calculated open circuit voltage and searched open circuit voltage; (CC) Correct current SOC to the compensation value; (S10) Internal resistance R = f(T, SOC); (S20) Pressure P_MAX = f(T, ΔAH); (S30) Calculate open circuit voltage V_ocv; (S40) Search the open circuit voltage V_ocv