Research on the Battery Charging Strategy With Charging and Temperature Rising Control Awareness

Abstract

Fast charging of lithium-ion batteries is an essential problem that constrains the large-scale deployment of electric vehicles. To solve this problem, a new charging strategy is proposed in this paper. Three original contributions are made in this paper: 1) development of a novel multistage constant heating rates optimization method that reduces both the charging time and charging temperature increase, with the tradeoff between the charging time and charging temperature increase analyzed using the genetic algorithm (off-line strategy); 2) reduction of the charging time via ensuring a state of charge region by balancing the charge capacity and charge time; and 3) demonstration that the proposed method can be used under different temperatures by comparing the proposed method to the average constant current constant voltage (CCCV) under different temperatures; the comparison results suggest that the charging time of proposed method is reduced by 1.9%, 5.3%, 8.56%, and 9.54% compared to the average CCCV method under ambient temperature, 10 °C, 25 °C, and 40 °C, respectively. Moreover, the proposed method temperature rise is reduced by 48.6%, 28.3%, 67.3%, and 17.9% compared to the average CCCV method under ambient temperature 10 °C, 25 °C, and 40 °C, respectively.

Keywords

• Temperature rise
• charging time
• constant heating rates
• electric vehicle
• lithium ion battery
• SOC region