Second-order battery equivalent circuit model parameter identification method, device, and medium

Abstract

This application provides a method, device, and medium for identifying parameters of a second-order battery equivalent circuit model. The method includes: randomly initializing the positions of an osprey population within a defined parameter feasible solution space to obtain the initial position of each osprey. Each osprey's position represents a set of candidate parameter feasible solutions, with parameters including the ohmic internal resistance, two polarization resistors, and two polarization capacitors in the second-order battery equivalent circuit model; executing an iterative loop of the osprey optimization algorithm based on the initial position of each osprey to obtain the optimal position; and determining the parameter feasible solution corresponding to the optimal position as the optimal solution for the parameters of the second-order battery equivalent circuit model. During the iterative loop of the osprey optimization algorithm, the update of the osprey positions is controlled by dynamic coefficients, which change non-linearly with the number of iterations. This improves the identification accuracy and reliability of the second-order battery equivalent circuit model parameters.

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