Calibration Method For State Of Charge, And Battery System Providing Same

Abstract: The present invention relates to a method for calibrating an initial value of a state of charge (SOC) and a battery system providing the method. The battery system of the present invention includes: a storage unit for storing mapping data in which a state of charge estimated on the basis of an integral value of a cell current and a first open voltage estimated through a predetermined model simulating a cell voltage corresponding to the cell current are mapped to each other at every predetermined cycle; and a control unit that estimates a relationship graph between a plurality of states of charge (SOC) and a plurality of open circuit voltages, stored in the storage unit, on the basis of a predetermined state of charge-open circuit voltage lookup table, if the number of times of storing the mapping data satisfies a predetermined reference number of times, calculates a plurality of relationship graphs by reflecting a plurality of preset error values into a first relationship graph, calculates a plurality of sum values of distances between each of the plurality of relationship graphs and a plurality of pieces of the mapping data, determines an error value corresponding to a minimum value among the plurality of sum values as a final error value between the first open voltage and a second open voltage, and determines whether to calibrate an initial value of a state of charge (SOC) by determining whether the final error value belongs to a predetermined reference range.

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