Lithium-ion batteries have played a significant role in industries such as new energy vehicles. However, the performance of lithium-ion batteries is seriously affected by low temperatures. Alternating current (AC) self-heating is a feasible method to eliminate the negative effects of low temperatures on lithium-ion batteries. Nevertheless, the capacity degradation of batteries can be generated if the amplitude and frequency of AC are not adopted properly. In this study, the boundaries of temperature rise and capacity loss are calculated by an electrochemical-thermal coupled (ETC) model verified by experiments, and the range of AC parameters that satisfies the temperature rise requirement without capacity loss is determined. This range of AC parameters results from a combination of high amplitude and high frequency. Using AC in the range can heat the battery from -20 Â°C to above 0 Â°C within 5 minutes without any capacity loss.
Keywords Lithium-ion battery, self-heating, electrochemical-thermal coupled model, temperature rise, capacity loss