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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.
The performance of Lithium-ion batteries (LIBs) is seriously affected by temperature rise and mechanical degradation during the charge or discharge. In this work, a fully coupled thermomechanical model with the total heat generation rate is developed to analyze the mechanism of the temperature rise and stress distribution.
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.
Microscopically, a lithium-ion battery is formed by winding or stacking several cells in sandwich structure, as shown in Fig. 2.2. Each cell consists of five parts: positive and negative current collectors, positive and negative active materials and a separator. And the electrolyte and solvent are distributed around the sandwich structure.
2.2.3 Influence of Temperature on Battery Discharging Voltage At present, lithium-ion batteries can normally work in the range of 20–50 °C, but in practical use, most lithium-ion batteries can only ensure the working performance above0°C.Thissectionwillstudyandanalyzethechargeanddischargeperformance of lithium-ion batteries at low temperature.
After shelving, the battery was charged at constant current with rates of 10 A, 35 A, 70 A and 140 A respectively. When the battery voltage rises to 4.2 V, the battery was charged at a constant voltage of 4.2 V, and when the current dropped to I/10 (I represents a different charging current), the charging was stopped.
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