装配工况下PEMFC不同双极板截面接触行为研究  

Investigation on Contact Behavior of PEMFC with Different Bipolar Plate Section Shapes under Assembly Conditions

作　　者：任立海 杨振华 李盛 蒋成约[3] 赵清江 REN Lihai;YANG Zhenhua;LI Sheng;JIANG Chengyue;ZHAO Qingjiang(State Key Laboratory of Vehicle NVH and Safety Technology,Chongqing 401122,China;Postdoctoral centre,China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China;Key Laboratory of Advanced Manufacturing Technology for Automobile Parts(Ministry of Education),Chongqing University of Tech-nology,Chongqing 400054,China)

机构地区：[1]汽车噪声振动和安全技术国家重点实验室,重庆401122 [2]中国汽车工程研究院股份有限公司博士后工作站,重庆401122 [3]重庆理工大学汽车零部件先进制造技术教育部重点实验室,重庆400054

出　　处：《湖南大学学报（自然科学版）》2023年第2期209-220,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51405050);汽车噪声振动和安全技术国家重点实验室开放基金资助项目(NVHSKL-202004);重庆市研究生科研创新资助项目(CYS21446);重庆市教委科学技术研究资助项目(KJQN201901141)。

摘　　要：为进一步探究双极板几何形状对层间接触行为的影响,以金属双极板为对象,搭建了双极板压缩试验台,同时建立了双极板压缩试验有限元模型,根据压敏纸采集到的试验结果验证了模型的有效性.然后,分别搭建了梯形、矩形和波浪形三种常见截面形状的双极板有限元模型,并搭建了相应的双极板压缩试验有限元模型.通过仿真分析研究在不同装配载荷作用下双极板截面形状对层间接触行为的影响.结果表明:装配载荷大小和双极板截面形状对双极板与气体扩散层(Gas Diffusion Layer, GDL)之间的接触行为有显著影响;在不同装配载荷作用下,三种双极板肋下的GDL表面接触应力幅值均在0.5~2 MPa之间,均符合装配要求;在同等条件下,双极板肋宽度是决定双极板与GDL之间整体平均接触应力幅值和GDL平均侵入面积的主要因素;在三种双极板中,矩形双极板下的接触行为对装配载荷的变化更为敏感,并且矩形双极板下平均接触应力分布均匀性最差.This study aimed to investigate the effect of bipolar plate geometry on the contact behavior of PEMFC.The bipolar plate compression test and the corresponding finite element(FE) model were developed taking a metal bipolar plate as an objective. The effectiveness of the FE model was validated against the experimental data collected by pressure-sensitive films. Then, the FE models of bipolar plates with trapezoidal, rectangular, and wavy section shapes and the corresponding compression tests were established, respectively. The effect of bipolar plate section shape on contact behavior under different assembly pressure was investigated by FE simulations. The results demonstrated that the assembly pressure and the section shape of the bipolar plate had a significant effect on the contact behavior between the bipolar plate and the gas diffusion layer(GDL). Under different assembly pressure, the amplitudes of GDL surface contact pressure beneath the ribs of three kinds of the bipolar plate were between 0.5-2 MPa, which can meet the assembly requirements. The rib width of the bipolar plate is the critical factor that determines the amplitude of the overall average contact pressure between the bipolar plate and GDL as well as the average intrusion area of GDL. Among those three kinds of bipolar plates, the contact behavior under the rectangular bipolar plate is more sensitive than others, while the uniformity of average contact pressure distribution is the worst.

关 键 词：质子交换膜燃料电池 有限元方法 截面形状 接触应力 GDL侵入 

分 类 号：TM911.4[电气工程—电力电子与电力传动]