During the rapid charging process of lithium-ion batteries, internal overheating and lifespan degradation are major issues. To ensure fast charging while actively constraining the critical physical states of lithium-ion batteries, a battery fast charging method based on the Model Predictive Control (MPC) algorithm is proposed. By simplifying the electrochemical model and establishing an electro-thermal-aging integrated model, the accuracy of the electro-thermal simulation was verified under typical charging scenarios. Based on this, a model-based state of charge and internal temperature estimation method was designed. To balance charging speed, temperature constraints, and lifespan degradation suppression, a fast-charging strategy based on split future MPC is proposed. The results indicate that the proposed charging strategy can actively limit the internal temperature of the battery to always remain below a predetermined threshold. Under similar charging speed conditions, the proposed charging strategy has a lower lifespan degradation rate compared to the optimized constant current-constant voltage charging method, and can reduce the charging time by 7.7% compared to the standard MPC algorithm. In conclusion, the proposed fast charging strategy, based on the MPC method, effectively constrains the internal states of the battery, comprehensively enhancing the speed, safety, and durability of the lithium-ion battery charging process.
Research on Charging Control Strategies of Lithium-ion Batteries Considering Electrochemical Characteristics
2024-10-10
634663 byte
Conference paper
Electronic Resource
English
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