EIS过程阻力与铅酸电池荷电量

电化学阻抗谱是研究电池的重要技术之一，但被解谱模型不一致限制了独立应用．研究表明：可以用传输线模型中串联电阻和电容的比值（Ri/Ci）表征过程阻力特征，并与电池荷电量（SOC％）有单调关系．借助文献中铅酸电池EIS数据进行了验证，表明尺忍的对数与SOC％有直线关系，且当SOC％从0变化到100时，Ri/Ci变化5-100倍，具有较高的灵敏度．最后探讨了溶液电阻在电池过程阻力中的重要作用．

The relationship of processes resistance in EIS with state of charge in lead acid batteries

The electrochemical impedance spectroscopy （EIS） is one of the most important techniques to study batteries. But the non-identical models for EIS data interpretation influences its results＇ objectivity, severely restricting independent application of EIS in many domain. In this paper, the processes resistance characteristics of CR transmission line model （CRM）was researched. Authors conjectured that it was possible to express them using the ratio of resistance to capacitance in series （Ri/Ci）,and to exist the monotone relationship with the the state of charge （SOC） of batteries. From this point of view, EIS data for different lead-acid batteries taken from the literature were fitted and interpreted again by above method. The results show that the semi-logarithmic plot of Ri/Ci vs SOC have a good linear relationship,and when SOC% changes from 0 to 100,the value of Ri/Ci can change 5 - 100 times, having high sensitivity. At last, the influence of R, on the linear relationship was discussed.