机械应力对燃料电池微孔层传输特性影响研究

张恒; 邵轩宇; 王虎

doi:10.19912/j.0254-0096.tynxb.2024-0230

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (6) : 212-218. DOI: 10.19912/j.0254-0096.tynxb.2024-0230

机械应力对燃料电池微孔层传输特性影响研究

张恒¹, 邵轩宇², 王虎³

作者信息 +

STUDY OF EFFECT OF MECHANICAL STRESS ON TRANSPORT PROPERTIES OF FUEL CELL MICROPOROUS LAYERS

Zhang Heng¹, Shao Xuanyu², Wang Hu³

Author information +

文章历史 +

摘要

该文首先对质子交换膜燃料电池中的微孔层进行数值重构,以获得其真实的微结构;随后,采用有限元方法模拟微孔层在不同机械压缩比下的应力-应变及孔隙率和孔径分布;最后,利用孔尺度模型求解机械压缩对微孔层传输特性的影响。研究结果表明：当机械压缩比从0增至30%时,微孔层的孔隙率和孔径大小分别减小20%和45%,同时曲度、有效热导率和有效电导率分别增至初始的1.5、1.6和1.7倍。此外,当压缩比从18%增至30%时,机械压缩对有效传输特性的影响明显大于压缩比从0增至18%时,表明约 18% 的机械压缩比为微孔层的优化压缩比。

Abstract

This study first numerically reconstructs the microporous layer （MPL） in proton exchange membrane fuel cells （PEMFCs） to obtain its real microstructure. Then, the finite element method is employed to simulate the stress-strain behavior, as well as the distribution of porosity and pore size in the MPL, under different mechanical compression ratios. Finally, a pore-scale model is used to analyze the effect of mechanical compression on transport properties. The results show that as the mechanical compression ratio increases from 0 to 30%, the porosity and pore size of the MPL decrease by 20% and 45%, respectively. Meanwhile, the effective tortuosity, thermal conductivity, and electrical conductivity increase to 1.5, 1.6, and 1.7 times of their uncompressed values, respectively. When the compression ratio increases from 18% to 30%, its impact on effective transport properties is significantly greater than that observed in the 0-18% range. The optimal mechanical compression ratio for the MPL is approximately 18%.

导出引用

张恒, 邵轩宇, 王虎. 机械应力对燃料电池微孔层传输特性影响研究[J]. 太阳能学报. 2025, 46(6): 212-218 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0230

Zhang Heng, Shao Xuanyu, Wang Hu. STUDY OF EFFECT OF MECHANICAL STRESS ON TRANSPORT PROPERTIES OF FUEL CELL MICROPOROUS LAYERS[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 212-218 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0230

中图分类号： TM911.4

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