摘要
为准确估计磷酸铁锂(LiFePO4)锂离子电池的荷电状态(SOC),测量了商用18650型电池在不同SOC下的电化学阻抗谱(EIS),对中频区的EIS谱进行研究。分析了电荷转移内阻RCT、双电层电容Cdl、过渡频率f、串联电阻Rs和串联电容Cs随SOC变化的规律。在一定的频率下,Cs随SOC的变化单调递减,可作为估计LiFePO4锂离子电池SOC的参数。
In order to estimate the state of charge（SOC） of lithium iron phosphate（LiFePO4） Li-ion battery with high accuracy, the electrochemical impedance spectroscopy（EIS） of commercial 18650 type battery under different SOC was tested, the EIS plots middle frequency range was studied. The relation between SOC changing and the EIS parameters such as charge transfer resistance RcT,double layer capacitor Cd1, transitional frequency f,scries resistance Rs and series capacitor Cs was analyzed. The Cs demonstrated the monotonous change with SOC at a certain frequeney,eotdd be used as parameter of estimating SOC for LiFePO4 Li-ion battery.
出处
《电池》
CAS
CSCD
北大核心
2012年第2期77-80,共4页
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