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首页> 外文期刊>Journal of power sources >Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks
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Experimental investigation of coupling phenomena in polymer electrolyte fuel cell stacks

机译：聚合物电解质燃料电池堆耦合现象的实验研究

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摘要

Propagation of performance changes to adjacent cells in polymer electrolyte fuel cell stacks is studied by means of voltage monitoring and local current density measurements in peripheral cells of the stack. A technical fuel cell stack has been modified by implementing two independent reactant and coolant supplies in order to deliberately change the performance of one cell (anomalous cell) and study the coupling phenomena to adjacent cells (coupling cells), while keeping the working conditions of the later cell-group unaltered. Two anomalies are studied: (i) air starvation and (ii) thermal anomaly, in a single anomalous cell in the stack and their coupling to adjacent cells. The results have shown that anomalies inducing considerable changes in the local current density of the anomalous cell (such as air starvation) propagate to adjacent cells affecting their performance. The propagation of local current density changes takes place via the common bipolar plate due to its finite thickness and in-plane conductivity. Consequently, anomalies which do not strongly influence the local current density distribution (such as a thermal anomaly under the studied working conditions) do not propagate to adjacent cells.
机译：通过电池组外围电池中的电压监控和局部电流密度测量研究了性能变化在聚合物电解质燃料电池组中向相邻电池的传播。为了实现有意改变一个电池（异常电池）的性能并研究与相邻电池（耦合电池）的耦合现象，同时保持电池的工作条件，技术性燃料电池堆已经通过实施两个独立的反应物和冷却剂供应进行了修改。后来的细胞群保持不变。研究了两个异常：（i）空气饥饿和（ii）热异常，在堆栈中的单个异常单元中，以及它们与相邻单元的耦合。结果表明，引起异常细胞局部电流密度发生显着变化的异常（例如空气饥饿）会传播到相邻细胞，从而影响其性能。由于其有限的厚度和平面内电导率，局部电流密度变化的传播通过普通的双极板发生。因此，不会强烈影响局部电流密度分布的异常（例如在研究的工作条件下的热异常）不会传播到相邻单元。

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