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

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机械应力对燃料电池微孔层传输特性影响研究

更新时间：2025-12-02

- 机械应力对燃料电池微孔层传输特性影响研究
- Vol. 46, Issue 6, Pages: 212-218(2025)
- 作者机构：
- 作者简介：
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- DOI：doi:10.19912/j.0254-0096.tynxb.2024-0230
  CLC： TM911
- Published Online：07 July 2025，
  
  Published：2025
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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]. 2025, 46(6): 212-218.
DOI：

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]. 2025, 46(6): 212-218. DOI： doi:10.19912/j.0254-0096.tynxb.2024-0230.

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%.

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references

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