A novel echelon internal heating strategy of cold batteries for all-climate electric vehicles application

• Published in: Applied energy 2018-06, Vol.219, p.256-263
• Main Authors: Guo, Shanshan, Xiong, Rui, Wang, Kan, Sun, Fengchun
• Format: Article
• Language: English
• Subjects: All−climate electric vehicles; Alternating current; Echelon heating strategy; Lithium-ion battery; Low temperature
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2018.03.052

•A novel echelon preheating strategy is proposed for all-climate battery.•A novel electro-thermal coupled model has proposed for calculating battery thermal.•The proposed method can get high and homogeneous temperature rise rate.•Results show that the proposed strategy has no apparent damage on battery health. Battery preheating at low temperatures is essential to ensure the efficient operation of electric vehicles in all climate conditions. Alternating current heating is proposed as an effective preheating method to improve the poor performance of lithium-ion batteries operated at low temperatures. To describe the dynamic voltage behavior accurately, the Butler-Volmer equation has been employed, and then a novel electro-thermal coupled model has been proposed for accurately calculating the thermal behavior of a battery. To obtain the optimal preheating performance, the electro-thermal coupled model-based available heating current computational method has been developed to obtain the optimal echelon preheating strategy. This method has the potential to balance the heat generation rate and degradation on battery lifetime. Finally, the proposed echelon heating strategy has been verified by battery cells and battery packs. Results show that the battery cell can be heated from the temperature of −20.3 °C to 10.02 °C by 13.7 min with an average temperature-rise 2.21 °C/min. And the battery pack can be heated from −20.84 °C to 10 °C by 12.4 min with an average temperature-rise is 2.47 °C/min.