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

作　　者：史启通 冯聪[1,3] 李冰[1,2] 张存满[1,2] 明平文 SHI Qitong;FENG Cong;LI Bing;ZHANG Cunman;MING Pingwen(Clean Energy Automotive Engineering Center,Tongji University,Shanghai,201804,China;School of Automotive Studies,Tongji University,Shanghai,201804,China;College of Materials Science and Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学新能源汽车工程中心,上海201804 [2]同济大学汽车学院,上海201804 [3]同济大学材料学院,上海201804

出　　处：《汽车安全与节能学报》2023年第1期98-105,共8页Journal of Automotive Safety and Energy

基　　金：国家重点研发计划(2018YFB1502500)。

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240kPa和420kPa;说明本解析解可很好地拟合实验数据;当脊槽转角半径为340μm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。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.

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 

分 类 号：U467.14[机械工程—车辆工程]