Experimental study of dynamic performance of defective cell within a PEMFC stack |
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Affiliation: | 1. College of Mechanical and Vehicle Engineering, The State Key Laboratory of Mechanical Transmissions, Chongqing Automotive Collaborative Innovation Center, Chongqing University, Chongqing, 400044, China;2. Propulsion Research Institute of Chongqing Changan New Energy Vehicle Technology Co., Ltd., Chongqing, 400000, China;3. National Hydrogen Power Quality Supervision and Inspection Center, China Automotive Engineering Research Institute Co., Ltd, Chongqing, 401122, China;4. Chongqing Fuel-Cell Technology Innovation & Industry Research Co. Ltd, Chongqing, 402760, China;5. Yutong Bus Co. Ltd., Yutong Industrial Park, Yutong Road, Zhengzhou, Henan Province, 450061, China |
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Abstract: | Defective cell in a PEMFC stack may reduce durability and reliability of the stack and even damage the stack. However, the dynamic performance of defective cell within a PEMFC stack is not clear. In this paper, the dynamic characteristics of the defective cell under different load conditions are analyzed. The results reveal that the defective cell has slower dynamic response rate than other single fuel cells, and the defective cell causes a poor voltage uniformity of the stack. The increased frequency of load change makes the voltage change rate of defective cell higher. The increased amplitude of load change has a more negative impact than the increased frequency of load change, and makes the defective cell more prone to flooding. Furthermore, impedance spectrum shows that these load conditions have greater negative effect for the defective cell than other cells. Finally, according to the experimental results and practical application, recommends related to control strategy of PEMFC stack are proposed to extend lifetime. |
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Keywords: | Proton exchange membrane fuel cell Dynamic characteristics Defective cell Load conditions |
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