碳基复合材料双极板真空浸渍制备工艺  

Preparation process of graphite-based composite bipolar plate by vacuum impregnation

作　　者：詹梓泽 郑俊生[1,2] 樊润林 姚东梅 陈静[1,2] 明平文 ZHAN Zize;ZHENG Junsheng;FAN Runlin;YAO Dongmei;CHEN Jing;MING Pingwen(Clean Energy Automotive Engineering Center,Tongji University,Shanghai 201804,China;School of Automotive Studies,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

出　　处：《材料工程》2024年第3期44-51,共8页Journal of Materials Engineering

基　　金：国家科技部重点研发计划(2020YFB1505904)。

摘　　要：采用真空浸渍树脂的方法制备燃料电池复合材料双极板,研究真空浸渍过程环氧树脂稀释剂的添加量、温度以及石墨的孔隙结构对浸渍树脂量的影响,并考察制备的燃料电池双极板的导电性能、抗弯强度以及气密性能。结果表明:环氧树脂稀释剂含量的增加和温度的提高可以降低树脂黏度,进而提高树脂的浸渍上限,使树脂能够浸渍填充到更微小的孔隙中,同时仍然存在着一些孔隙无法填充浸透,在膨胀石墨板中0.1μm以下的孔隙难以被完全渗进,导致树脂无法完全填满膨胀石墨的整个孔隙。采用真空浸渍法浸渍环氧树脂/稀释剂体系的适宜温度为50℃,稀释剂乙二醇二缩水甘油醚最优添加比例为15%(质量分数),所获得的双极板EGP-H平面电导率为340.12 S/cm,抗弯强度为41.52 MPa,氦气渗透率为5.4×10^(-7)cm^(3)·cm^(-2)·s^(-1)。The vacuum impregnation resin method was used to prepare composite bipolar plates in fuel cell in this study.The effects of the content of epoxy resin diluent added,temperature and pore structure of graphite on the impregnation content during the vacuum impregnation process were studied.The electrical conductivity,flexural strength and airtightness of the prepared fuel cell bipolar plates were investigated.The results show that increasing the content of diluent and temperature can reduce viscosity and increase the upper limit of resin impregnation,enabling the resin to impregnate and fill into smaller pores,while there are still some pores that cannot be filled and saturated,such as the pores below 0.1μm are difficult to fully penetrate in the expanded graphite plate,resulting in the resin being unable to completely fill the entire pores of the expanded graphite.The optimal temperature for impregnating the epoxy resin/diluent system by vacuum impregnation is 50℃,and the optimal addition ratio of diluent ethylene glycol diglycidyl ether is 15%(mass fraction).The obtained bipolar plate has excellent electrical conductivity of 340.12 S/cm,flexural strength of 41.52 MPa,and helium permeability of 5.4×10^(-7)cm^(3)·cm^(-2)·s^(-1).

关 键 词：燃料电池 双极板 真空浸渍 膨胀石墨 

分 类 号：TM911.48[电气工程—电力电子与电力传动]