Method and system for constructing open-circuit voltage curve

The invention relates to the technical field of power batteries, and discloses a method and system for constructing an open-circuit voltage curve, and the method comprises the steps: carrying out thefitting of a relation equation between an open-circuit voltage and an actual discharge depth based on the corresponding relation between the open-circuit voltage of a battery and the actual dischargedepth; obtaining a corresponding relation between the open-circuit voltage and the calibrated discharge depth based on the fitted relation equation, the calibrated state of charge and the calibrated battery capacity; and based on the actual battery capacity, the calibrated discharge depth and the obtained corresponding relationship between the open-circuit voltage and the calibrated discharge depth, constructing a curve that the open-circuit voltage changes along with the actual state of charge. According to the method, the curve that the open-circuit voltage OCV changes along with the actualstate of charge SOC can be