暂态边界电压法在线测试全钒液流电池阻抗  

On-line resistance measurement for all vanadium redox flow battery by transient-boundary voltage method

作　　者：潘建欣[1,2] 廖玲芝[1] 谢晓峰[2] 王树博[2] 王金海[2] 尚玉明[2] 周涛[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《化工进展》2012年第9期1946-1949,1974,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21176140);国家高技术研究发展计划(2012AA051201);清华大学自主科研计划20101082063)项目

摘　　要：国内首次采用暂态边界电压法在线研究了全钒液流电池(VRB)的特性,建立了由电压源、电阻以及一个电阻与电容并联的3部分串联而成的等效电路模型;研究了电流密度和荷电状态(SOC)对等效电路元件的影响。实验结果表明,极化阻抗随电流密度的增加有轻微下降,在充电初期和放电末期达到最大值。与极化阻抗相比,充、放电过程中的欧姆阻抗最大,是导致电压损失的主要因素,分别为1.905Ω.cm2和2.139Ω.cm2,暂态边界电压法是一种简单且有效的表征全钒液流电池性能的新方法。A single cell of vanadium redox flow battery（VRB） was investigated on-line by the transient-boundary voltage method.An equivalent circuit model was established using the voltage source,resistor,and a resistor in parallel with the capacitance of three-part series.The effects of current density and state of charge（SOC） on equivalent circuit components values were investigated.The experimental results showed that the polarization resistance decreased slightly with increasing current density,and reached its maximum in the beginning of charge and the end of discharge.Compared with polarization resistance,ohm impedance in the charge/discharge process was the highest respectively 1.905 cm2and 2.139 cm2.It was the main factor leading to voltage loss.The transient boundary voltage method is a simple and effective way of characterizing performance of vanadium redox flow battery.

关 键 词：全钒液流电池 暂态边界电压法 等效电路模型 欧姆阻抗 极化阻抗 

分 类 号：TM911.48[电气工程—电力电子与电力传动]