汽车工程 ›› 2023, Vol. 45 ›› Issue (9): 1720-1727.doi: 10.19562/j.chinasae.qcgc.2023.09.020

所属专题: 新能源汽车技术-动力电池&燃料电池2023年

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气体扩散层分层设计对PEMFC电堆性能影响研究

王万腾,李楠(),白雪宜,杨抖,栗航,李贵敬   

  1. 燕山大学车辆与能源学院,秦皇岛 066004
  • 收稿日期:2023-03-19 修回日期:2023-04-17 出版日期:2023-09-25 发布日期:2023-09-23
  • 通讯作者: 李楠 E-mail:linan@ysu.edu.cn

Research on Effect of Gas Diffusion Layer Layered Design on the Performance of PEMFC Stack

Wanteng Wang,Nan Li(),Xueyi Bai,Dou Yang,Hang Li,Guijing Li   

  1. School of Vehicle and Energy,Yanshan University,Qinhuangdao 066004
  • Received:2023-03-19 Revised:2023-04-17 Online:2023-09-25 Published:2023-09-23
  • Contact: Nan Li E-mail:linan@ysu.edu.cn

摘要:

为了改善电堆不同电池单元之间的温度、反应物等的均匀性从而改善电堆性能和提升寿命,本文提出了一种在电堆不同电池单元气体扩散层设置不同的梯度孔隙率的改进方案。通过建立包含5层单电池的三维、非等温、单相的短电堆模型进行分析,研究发现孔隙率为0.4-0.5-0.6-0.5-0.4的方案可以最大程度改善边缘层和中间层单电池之间温度、氧气浓度、水浓度、膜电流密度等的差值,即提高电堆内部均匀性,且在缺气工况条件下亦是如此。

关键词: 质子交换膜燃料电池, 燃料电池电堆, 数值模拟, 气体扩散层, 分层设计

Abstract:

In order to improve the uniformity of temperature and reactants between different cells in the stack, thus improving the stack performance and extending the stack life, an improved scheme of setting different gradient porosity in gas diffusion layers of different cell units in the stack is proposed in this paper. A three-dimensional, non-isothermal, single-phase short stack model with five layers of cell units is established for analysis. It is found that the scheme with porosity of 0.4-0.5-0.6-0.5-0.4 can minimize the difference of temperature, oxygen, water molar concentration, membrane current density between the edge layer and the intermediate layer cell unit; thereby improve the internal uniformity of the stack, which is also the same trend under the operating conditions of gas shortage.

Key words: proton exchange membrane fuel cell, fuel cell stack, numerical simulation, gas diffusion layer, layered design