BATTERY MANAGEMENT SYSTEM, AND METHOD OF ESTIMATING BATTERY'S STATE OF CHARGE USING THE SAME

摘要

A method of estimating a state of charge of a battery relates to a method of estimating the state of charge (SOC) of a battery module having at least one battery cell through a battery management system (BMS) which includes (a) a step where a measuring unit included in the battery management system measures the off potential, which is the open circuit voltage of the battery cell; and (b) a step where a control unit of the battery management system estimates the state of charge corresponding with the off potential measured in step (a) based on a lookup table. The lookup table includes battery cell temperature, charging and discharging numbers and state of charge (SOC) corresponding with the off potential according to the discharge current amount.