A model predictive control-based electric vehicle fast charging method and device

Abstract

The application relates to a model prediction control-based electric vehicle fast charging method and device, and belongs to the technical field of lithium battery charging, wherein the method comprises the following steps: establishing a lithium ion battery electric-thermal-aging coupling model, and identifying model parameters; according to measured battery surface temperature and terminal voltage, a state observer is used to estimate the battery core temperature and internal state variables; a charging optimization model is constructed by taking the maximum battery core temperature and maximum terminal voltage as constraints, and a charging strategy is optimized under a model prediction control framework; and the optimized fast charging decision current is input into a rule-based closed-loop feedback control to determine the current time electric vehicle fast charging current. The application can intelligently consider the rapidity, safety and life expectancy of the electric vehicle charging process, realizes safe and durable fast charging, solves the strong nonlinear battery model and the multi-objective optimization problem of fast charging based on the model prediction control and the effective set algorithm, and improves the online application capability of the charging strategy.

Images