CIESC Journal ›› 2020, Vol. 71 ›› Issue (7): 3247-3257.DOI: 10.11949/0438-1157.20191126

• Energy and environmental engineering • Previous Articles     Next Articles

Analysis of PEMFC water management status based on DC internal resistance and AC impedance characteristics

Ru WANG1(),Yongchao SHEN2,Dong WEI2(),Qian GUO2   

  1. 1.Infrastructure Construction Department, China Jiliang University, Hangzhou 310018, Zhejiang, China
    2.College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China
  • Received:2019-11-20 Revised:2020-02-27 Online:2020-07-05 Published:2020-07-05
  • Contact: Dong WEI

基于直流内阻和交流阻抗特性的PEMFC水管理状态分析

王茹1(),沈永超2,卫东2(),郭倩2   

  1. 1.中国计量大学基建处,浙江 杭州 310018
    2.中国计量大学机电工程学院,浙江 杭州 310018
  • 通讯作者: 卫东
  • 作者简介:王茹(1969—),女,本科,工程师,04a4400007@ cjlu.edu.cn
  • 基金资助:
    国家重点研发计划项目(2017YFF0210702);浙江省基础公益研究计划项目(LGG18E070004)

Abstract:

Based on the Randles equivalent circuit, this paper studies the coupling relationship between operating temperature and humidity of proton exchange membrane fuel cell (PEMFC), establishes the direct current (DC) internal resistance and alternating current (AC) impedance characteristics of the stack, and studies the electrochemical impedance spectrum and U-I output characteristics under different operating conditions. The AC impedance method and the U-I characteristic method are combined to obtain the correspondence between the AC impedance and the DC internal resistance under different water management states, and the influence of the water management state on the output performance of the stack is analyzed. The simulation and experimental results show that the different water management states have consistent variation rules and corresponding quantitative relationships in the AC impedance spectrum and the U-I characteristic curve. The phenomenon of membrane dryness, flooding, etc. in the output performance of the stack is in the DC internal resistance. And the change of the AC impedance map has clear performance characteristics. By studying the impact of water management states on both, it is possible to optimize the operating conditions and optimize the output performance of the stack.

Key words: EIS, humidity, operation conditions, PEMFC, water management

摘要:

基于Randles等效电路,研究质子交换膜燃料电池(PEMFC)操作温度和湿度耦合关系,建立电堆直流内阻和交流阻抗特性模型。通过两种方法相结合,研究不同操作条件下的电化学阻抗谱图和U-I输出特性曲线的变化规律,以及不同水管理状态在直流内阻和交流阻抗变化规律中体现出的对应关系,进而分析水管理状态对电堆输出性能的影响作用。仿真和实验结果表明,温湿度耦合关系下的不同水管理状态,在电化学阻抗谱图和U-I特性曲线中具有一致的变化规律和对应的量化关系;电堆输出性能中的膜干、水淹等现象,在直流内阻值和交流阻抗图的变化中具有明显的表现特征;通过研究水管理状态对两者的影响,能够实现操作条件的优化和电堆输出性能的优化控制。

关键词: 电化学阻抗谱, 湿度, 操作条件, 质子交换膜燃料电池, 水管理状态

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