Improved parameter identification and infinite algorithm fused SOC estimation method and system

The invention relates to the technical field of battery monitoring, and provides an improved parameter identification and infinite algorithm fused SOC estimation method and system, and the method comprises the steps: building a second-order RC equivalent circuit model according to the dynamic and static characteristics of a battery, and calculating a state equation and an output equation of the model; performing parameter identification by adopting a variable forgetting factor recursive least square method introducing a limited memory link, combining an adaptive unscented H infinite filtering algorithm with a second-order RC equivalent circuit model with known parameters, and establishing an SOC estimation model; and adjusting the noise coefficient through an adaptive algorithm to obtain an estimated value of the SOC. According to the method, parameter identification is carried out by using the time-varying and variable forgetting factor recursive least square method of limited memory, and the SOC of the lith