Air-cooled proton exchange membrane fuel cells (AC-PEMFC) have wide applications due to their simple structure, and high efficiency. However, AC-PEMFC also needs effective methods to further improve the dynamic response and output power in the kW-grade power. Thus, this paper analyzed the dynamic characteristics and stability of the designed kW-grade AC-PEMFC at the beginning. Then, the effect of purging and active short-circuit activation strategy (ASC) are studied to solve the flooding and Pt oxidation problems, respectively. The results are as follows: (1) The AC-PEMFC capability of water and thermal self-regulation is limited in high power. Thus, active water management strategies based on flooding degree need to be researched; (2) To improve performance consistency and stability of the system, the ASC has high effectiveness on the performance improvement and dynamic performance consistency due to Pt catalyst oxidation prevention, note that the operating efficiency of the stack can be effectively improved 3-5% by using ASC. These results provide a novel reference for portable power source design and unmanned aerial vehicle design to improve the performance of kW-grade AC-PEMFC.

中文翻译：

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kW级风冷燃料电池动态特性及性能提升实验研究

风冷质子交换膜燃料电池（AC-PEMFC）由于其结构简单、效率高而具有广泛的应用。但AC-PEMFC还需要有效的方法来进一步提高kW级功率的动态响应和输出功率。因此，本文首先分析了所设计的千瓦级AC-PEMFC的动态特性和稳定性。然后，研究了吹扫和主动短路激活策略（ASC）的效果，分别解决了水淹和 Pt 氧化问题。研究结果如下： (1)AC-PEMFC的水热自调节能力在高功率下受到限制。因此，需要研究基于洪水程度的主动水管理策略； (2) 为了提高系统的性能一致性和稳定性，ASC由于Pt催化剂的防氧化作用，对性能提升和动态性能一致性具有高效性，注意可以有效提高电堆的运行效率3-5%使用ASC。这些结果为便携式电源设计和无人机设计提高千瓦级AC-PEMFC的性能提供了新颖的参考。