Method for diagnosing state of hydrothermal management of fuel cell stack based on frequency secant angle

doi:10.11949/j.issn.0438-1157.20180559

Abstract

Abstract:

Hydrothermal state management is of great significance for improving the output performance of fuel cell stack. Based on the principle of electrochemical impedance spectroscopy, this paper combines the equivalent circuit model and obtains the response of two impedance spectrum characteristic frequency points to calculate the angle between the frequency response point connection line and the real axis (frequency secant angle) and proposes a frequency secant angle calculation method. The angle has a unique correspondence with the resistance change of the stack proved by theory. The simulation and experimental results show that the results of the frequency secant angle can describe the changes of the hydrothermal management state in the reactor and the effects of the operating conditions on the output performance of the reactor. This method avoids the deficiencies of complicated AC impedance test procedures, long time period, difficulty of parameter fitting, etc.. It provides an obvious, direct, and simple diagnostic method, which lays a foundation for the optimization of the operating conditions of the stack and the early warning of output performance failure. It has a good application prospect.

Key words: AC impedance, frequency secant angle, operating conditions, membrane drying, water flooding

摘要：

水热状态管理对提高燃料电池堆输出性能具有重要意义。本文基于电化学阻抗谱法原理，结合等效电路模型，通过获取两个阻抗谱特征频率点响应，计算出频率响应点连线与实轴夹角（频率正割角），提出了一种频率正割角计算方法。理论证明该角度与电堆内阻变化具有唯一性对应关系。仿真和实验结果表明，频率正割角计算结果能够很好地描述堆内水热管理状态变化，以及操作条件变化对电堆输出性能的影响。该方法避免了交流阻抗试验测试步骤繁复、时间周期长、参数拟合困难等不足，给出一种特征明显、直接简便的诊断方法，为电堆操作条件优化和输出性能故障预警奠定了基础，具有良好的应用前景。

关键词: 交流阻抗, 频率正割角, 操作条件, 膜失水, 电极淹没

CLC Number:

TM911.4

WANG Zhen, WEI Dong, YE Hongji. Method for diagnosing state of hydrothermal management of fuel cell stack based on frequency secant angle[J]. CIESC Journal, 2018, 69(10): 4371-4377.

王振, 卫东, 叶洪吉. 基于频率正割角计算的燃料电池堆水热管理状态诊断方法[J]. 化工学报, 2018, 69(10): 4371-4377.

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