This paper has designed a temperature-aware charging strategy with adaptive current sequences to improve the charging performance of lithium-ion batteries in cold environments. An integrated battery model with time-varying parameters is established to reveal the relationship among battery electrical, thermal, and aging features.
Analysis on Charge and Discharge Temperature Characteristics of Lithium-ion Batteries The influences of temperature on the characteristics of lithium-ion batteries are mainly reflected in battery capacity, internal resistance, charge and discharge power and so on.
In this study, lithium-ion battery cells were discharged at constant current at 10 A, 35 A, 70 A and 140 A in the temperature range of 40 –20°C. The relationship between discharging voltage and capacity of the batteries is shown in Figs. 2.10, 2.11, 2.12 and 2.13.
Temperature measurements of Li-ion batteries are important for assisting Battery Management Systems in controlling highly relevant states, such as State-of-Charge and State-of-Health. In addition, temperature measurements are essential to prevent dangerous situations and to maximize the performance and cycle life of batteries.
2.1.2 Working Principle of Lithium-ion Battery In the charging process of a lithium-ion battery, Li+is removed from the positive compound and adsorbed by the carbon substance in the anode, and the anode is in a low-potential lithium-rich state, while the cathode is in a high-potential lithium- poor state.
Lithium-ion batteries have been widely used in electric vehicles and consumer electronics, such as tablets and smartphones . However, charging of lithium-ion batteries in cold environments remains a challenge, facing the problems of prolonged charging time, less charged capacity, and accelerated capacity decay .