Lithium-Ion Battery Polarization Characteristics at Different Charging Modes
Yang Fan1, Qiao Yanlong1, Gan Degang2, Wang Qian3, Chen Wei3
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. State Grid Sichuan Electric Power Corporation Research Institute Chengdu 610000 China; 3. State Grid Chongqing Electric Power Corporation Research Institute Chongqing 400000 China
Abstract：High current fast charging of Lithium-ion battery has become a developing trend in recent years. However, high current charging will cause great polarization within the battery, which has great influence on its performance and cycle life. Lithium-ion battery polarization characteristics at different charging methods were investigated. Firstly, an electrochemical-thermal transient numerical model based on LiMn2O4/graphite was established. Herein, the electrochemical process and real-time heat source change were taken into full consideration. Secondly, variation current charging was utilized, and time-varying characteristics of three polarizations were analyzed based on cell voltage and spatial distributions of electrolyte salt concentration. Then cell voltage and polarization voltage along with SOC at different constant current charging rates were analyzed. Subsequently, two variables PA and SOCc were defined to represent the degree of polarization and available capacity. Polarization voltage characteristics under different charging conditions were analyzed quantitatively. Finally, polarization of reflex fast charging influence of different tch on charging was studied. The results show that polarization voltage is affected by charging current and SOC directly, while the polarization affects cell voltage on the other hand. Reflex fast charging can suppress the polarization voltage and weaken its influence on charging.
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2017, Vol. 32 
