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首页> 外文会议>International Conference on Fuel Cell Science, Engineering and Technology; 20040614-20040616; Rochester,NY; US >STACK COMPRESSION OF PEM FUEL CELLS
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STACK COMPRESSION OF PEM FUEL CELLS

机译：PEM燃料电池的堆叠压缩

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摘要

The effect of dimensional changes of fuel cell components from temperature and hydration cycles on the stack compression is investigated in this paper. Using a simple spring model including the membrane electrode assembly (MEA), gas diffusion layers (GDL), bipolar plates, seal gaskets, current collectors, insulation plates, end plates, and side plates, we find significant compression changes from 30% over-compression to 23% compression loss from both temperature and humidity changes. The wide range of variation in stack compression is attributed to the swelling behavior of polymer electrolyte membranes, the compression behavior of gas diffusion layers, and the design of stack assembly. This paper also reports the use of finite element method to investigate the compression of MEA and GDL over the channel area where MEA buckling from membrane swelling can result in separation of MEA and GDL. It is suggested that the compression over channels can be improved with higher transverse shear modulus in the GDL in addition to the use of narrower channels. In this paper, we will also discuss the challenges facing the fuel cell manufacturers and component suppliers on the needs for new materials with improved mechanical properties and better testing/modeling techniques to help achieving stable compression and better fuel cell stack designs.
机译：本文研究了温度和水合循环对燃料电池组件尺寸变化的影响，对燃料电池堆压缩性能的影响。使用一个简单的弹簧模型，包括膜电极组件（MEA），气体扩散层（GDL），双极板，密封垫，集电器，绝缘板，端板和侧板，我们发现压缩比显​​着变化超过30％由于温度和湿度的变化，压缩率降低到23％。堆压缩的广泛变化归因于聚合物电解质膜的膨胀行为，气体扩散层的压缩行为以及堆组件的设计。本文还报告了有限元方法的使用，以研究MEA和GDL在通道区域的压缩，在该区域，MEA因膜溶胀而弯曲可能导致MEA和GDL分离。建议在GDL中使用较高的横向剪切模量，以及使用较窄的通道，可以改善通道上的压缩。在本文中，我们还将讨论燃料电池制造商和组件供应商在对具有改善的机械性能和更好的测试/建模技术的新材料的需求方面所面临的挑战，以帮助实现稳定的压缩和更好的燃料电池堆设计。

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