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《Transactions of China Electrotechnical Society》 2017-12
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Lithium-Ion Battery Polarization Characteristics at Different Charging Modes

Yang Fan;Qiao Yanlong;Gan Degang;Wang Qian;Chen Wei;State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University;State Grid Sichuan Electric Power Corporation Research Institute;State Grid Chongqing Electric Power Corporation Research Institute;  
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 LiMn_2O_4/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.
【Fund】: 中央高校基本科研业务费项目资助(CDJZR13150051)
【CateGory Index】: TM912
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