Charging Optimization Method of Lithium-Ion Battery Based on Multi-parameter Coupling Model
To meet the needs of electric vehicle users and ensure the safety of lithium battery use,it is crucial to design a safe and efficient charging control strategy that conforms to the on-board working characteristics of lith-ium batteries.Therefore,this article develops a multi-stage constant current charging strategy suitable for auto-motive lithium batteries based on a multi-parameter coupling model,achieving comprehensive performance im-provement of lithium-ion batteries in terms of charging time,charging temperature rise,and charging energy loss during the charging process.Firstly,based on the equivalent circuit model,Bernardi thermal model,and energy loss model,a multi-parameter coupled model of electricity heat energy loss was established,achieving accurate characterization of electrical,thermal,and energy loss characteristics during the charging process of lithium batter-ies.Secondly,a multi-objective optimal charging strategy considering charging time,temperature rise,and energy loss was proposed,and temperature and battery parameters were limited.Particle swarm optimization algorithm was used to optimize the multi-stage constant current charging strategy.Finally,the performance of the devel-oped multi-stage constant current charging control strategy was verified by comparing it with the standard con-stant current charging method determined by the manufacturer under laboratory conditions.The results show that the proposed optimized charging strategy is significantly superior to the standard constant current charging strate-gy,achieving a 12.8％reduction in charging time and a 19.1％reduction in energy loss during the charging process when the maximum temperature of the battery only increases by about 2.2 ℃.
万方数据
维普
