气体扩散层变形模量与脊槽转角半径优化设计

doi:10.3969/j.issn.1674-8484.2023.01.012

汽车安全与节能学报 ›› 2023, Vol. 14 ›› Issue (1): 98-105.DOI: 10.3969/j.issn.1674-8484.2023.01.012

气体扩散层变形模量与脊槽转角半径优化设计

史启通¹^,²(), 冯聪¹^,³, 李冰¹^,², 张存满¹^,², 明平文¹^,²^,^*()

1.同济大学新能源汽车工程中心，上海 201804，中国
2.同济大学汽车学院，上海 201804，中国
3.同济大学材料学院，上海 201804，中国

收稿日期:2022-07-08 修回日期:2022-11-11 出版日期:2023-02-28 发布日期:2023-03-07
通讯作者: 明平文
作者简介:*明平文，教授。E-mail：pwming@tongji.edu.cn。
史启通(1987—)，男(汉)，安徽，博士研究生。E-mail：2011676@tongji.edu.cn。
基金资助:
国家重点研发计划(2018YFB1502500)

Deformation modulus and optimal design of ridge/groove bending radius for the gas diffusion layer

SHI Qitong¹^,²(), FENG Cong¹^,³, LI Bing¹^,², ZHANG Cunman¹^,², MING Pingwen¹^,²^,^*()

1. Clean Energy Automotive Engineering Center, Tongji University, Shanghai, 201804, China
2. School of Automotive Studies, Tongji University, Shanghai, 201804, China
3. College of Materials Science and Engineering, Tongji University, Shanghai 201804, China

Received:2022-07-08 Revised:2022-11-11 Online:2023-02-28 Published:2023-03-07
Contact: MING Pingwen

摘要/Abstract

摘要：

提出了一种脊槽转角半径优化设计方法，以消除气体扩散层(GDL)应力集中现象，进而提高质子交换膜燃料电池 (PEMFC)性能和可靠性。基于梁弯曲理论和几何概率理论分析，获得气体扩散层应力—应变非线性解析解。对气体扩散层基材商品TGP-H-060和MGL1902进行了压缩测试，以验证解析解。结果表明：基材TGP-H-060和MGL190的变形模量分别为240 kPa和420 kPa；说明本解析解可很好地拟合实验数据；当脊槽转角半径为340 μm时，GDL上边缘最大接触压力最小，应力集中现象消失，应力分布的均匀性最好。变形模量影响了气体扩散层不均匀变形的程度，但不改变变形分布。因此，本优化设计改善了气体扩散层变形均匀性。

关键词: 质子交换膜燃料电池(PEMFC), 气体扩散层(GDL), 变形模量, 不均匀变形, 脊槽转角半径

Abstract:

A ridge/groove bending radius optimization design method was proposed to eliminate the stress concentration in the Gas Diffusion Layer (GDL) and to improve the performances and the reliability of Proton Exchange Membrane Fuel Cells (PEMFC). A nonlinear stress-strain analytical solution of the GDL was established based on the beam bending theory and the geometric probability analysis, and verified by the compression tests with some GDL base material of commercial, such as the commoditie of TGP-H-060 and MGL190. The results show that the deformation modulus are 240 kPa for the TGP-H-060 and 420 kPa for the MGL190, so the nonlinear stress-strain model of GDL fit the experimental data properly. The maximum contact pressure on the upper edge of GDL is minimum, the stress concentration phenomenon is eliminated, and the stress distribution uniformity is the best when the ridge/groove bending radius is 340 μm. The value of the deformation modulus affects the degree of non-uniform deformation, but does not change the deformation distribution. Therefore, this optimal design improves the deformation uniformity of the GDL.

Key words: proton exchange membrane fuel cells (PEMFC), gas diffusion layer (GDL), deformation modulus, non-uniform deformation, ridge/groove bending radius

中图分类号:

U467.1+4

史启通, 冯聪, 李冰, 张存满, 明平文. 气体扩散层变形模量与脊槽转角半径优化设计[J]. 汽车安全与节能学报, 2023, 14(1): 98-105.

SHI Qitong, FENG Cong, LI Bing, ZHANG Cunman, MING Pingwen. Deformation modulus and optimal design of ridge/groove bending radius for the gas diffusion layer[J]. Journal of Automotive Safety and Energy, 2023, 14(1): 98-105.

图/表 13

图1 气体扩散层模型简化示意图

图2 气体扩散层压缩实验装置示意图

图3 典型商用其他扩散层基材的变形模量

图4 脊槽气体扩散层压缩几何模型

ε / %	σ / kPa
0	0.0
10	40.6
20	146.5
30	428.4
40	1 234.6
50	3 840.0

表1 TGP-H-060 应力-应变

图5 自适应网格划分

图6 气体扩散层上边缘压缩变形量和接触压力

图7 服役前后变形模量比值与残余应变

图8 不同模量下气体扩散层上边缘压缩变形和接触压力

图9 脊下转角半径优化设计

L_a / μm	L_b / μm	ψ
40	40	1.561
80	90	1.242
120	200	1.067
160	340	1.024
200	520	1.021
240	740	1.018

表2 Lb值与脊槽转角半径R和应力集中指数ψ

图10 不同Lb下气体扩散层上边缘压缩变形和接触压力

图11 气体扩散层 Mises应力和最大名义主应变

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气体扩散层变形模量与脊槽转角半径优化设计

Deformation modulus and optimal design of ridge/groove bending radius for the gas diffusion layer

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