Efficient SOC-OCV relation curve acquisition method for lithium ion battery SOC estimation

The invention discloses a high-efficiency SOC-OCV relation curve acquisition method for lithium ion battery SOC estimation, and belongs to the technical field of batteries, and the method comprises the steps: collecting test data; calculating the SOC of the lithium battery; the SOC-OCV relation curve of the tested lithium battery is obtained; the tested SOC-OCV relation curve is optimized, and a curve feature point P is obtained; selecting five main feature points from the feature points P; the SOC corresponding to the five main feature points is tested, and the accurate OCV corresponding to the tested SOC is obtained; and moving the curve feature points of the four parts twice based on five accurate SOC-OCV relation points PC. According to the method, an optimization algorithm is adopted to simplify a curve into a linear interpolation curve with a small number of feature points, five main feature points are selected, an HPPC test and an increment OCV test are adopted to obtain five accurate OCV points to cor