摘要
质子交换膜燃料电池(PEMFC)的物理耐久性主要受机械应力的影响。研究电池运行过程中膜电极在温度、湿度及气体进气压力交变作用下的应力分布。应力集中发生在边框与气体扩散层(GDL)的交界处;在相同温度下,湿度的影响明显,在85℃时,相对湿度(RH)从30%升至90%,最大应力从5.3 MPa升至6.3 MPa;在相同湿度下,温度的影响不明显;气体压力有一定的影响,在RH为70%、65℃时,气体压力由0增加至250 kPa,位于GDL下方质子交换膜的应力最大值增加了157.36%。考虑进口区域气体的周期性冲击及干湿循环的交变作用,材料交界可能是膜最易损坏的部位。
The physical durability of proton exchange membrane fuel cell(PEMFC)was mainly affected by mechanical stress.The stress distribution of membrane electrode under the alternative action of temperature,humidity and gas inlet pressure during cell operation was studied.The stress occured concentratively on the junction of frame and gas diffusion layer(GDL).At the same temperature,the influence of humidity was obvious.At 85℃,the related humidity(RH)increased from 30%to 90%,the maximum stress increased from 5.3 MPa to 6.3 MPa.Under the same humidity,the influence of temperature was not obvious.The gas pressure had a certain influence.When the RH was 70%at 65℃,the maximum stress of proton exchange membrane under GDL increased by 157.36%when the gas pressure increased from 0 to 250 kPa.The junction of the material might be the most vulnerable part of the membrane considering the periodic impact of gas in the inlet area and the alternating effect of dry-wet cycle.
作者
廖礼文
杨小凡
张振
詹志刚
LIAO Li-wen;YANG Xiao-fan;ZHANG Zhen;ZHAN Zhi-gang(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan,Hubei 430070,China;School of Automotive Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China)
出处
《电池》
CAS
北大核心
2022年第3期248-252,共5页
Battery Bimonthly
基金
国家自然科学基金(22179103)
国家重点研发计划(2017YFB0101207)。
