冲击载荷下PEMFC力-电耦合建模及电学响应研究

doi:10.19562/j.chinasae.qcgc.2025.01.010

Abstract

Abstract:

In order to investigate the electrical response of proton exchange membrane fuel cell （PEMFC） stack under impact load， and to reveal the mechanical-electrical coupling mechanism of PEMFC stack， the mechanical-electrical coupling modeling method of the PEMFC stack under impact load is studied. A systematic investigation is undertaken to investigate the effect of impact velocity and direction on the electrical response of the PEMFC stack， based on the established mechanical-electrical coupling model of the PEMFC stack. The results show that the proposed method for modeling the mechanical-electrical coupling of the PEMFC stack can accurately simulate the inherent mechanical-electrical coupling characteristics within the PEMFC stack. The ohmic loss of the single cell inside the PEMFC stack increases as the shock load increases. Meanwhile， the impact load results in the formation of additional electrical contact between the gas diffusion layer （GDL） and the ribs of the bipolar plate， which causes a reduction in the average value of the current density on the surface of the GDL and deterioration in the distribution uniformity. This study has certain guiding significance for the modeling of PEMFC mechanical-electrical coupling and the study of electrical response under impact load.

Key words: proton exchange membrane fuel cell stack, finite element method, impact, mechanical-electrical coupling, electrical response

Lihai Ren,Lili Chen,Zhenhua Yang,Chengyue Jiang,Qingjiang Zhao,Xi Liu,Yuanzhi Hu. Research on PEMFC Mechanical-Electrical Coupling Modeling and Electrical Response Under Impact Load[J].Automotive Engineering, 2025, 47(1): 96-106.

Figures/Tables 28

References 25

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封装载荷/MPa	R₁/mΩ	R₂/mΩ	R₃/mΩ	ρ_316L/GDL/ （mΩ·mm²）	ρ_Cu/GDL/ （mΩ·mm²）
0.2	7.44	72.91	57.93	219 978.08	24 999.52
0.4	3.83	35.65	28.35	106 909.60	12 863.20
0.6	2.58	22.21	19.30	65 941.12	8 684.48
0.8	1.96	18.25	14.34	54 754.56	6 576.64
1.0	1.58	15.11	11.11	45 465.28	5 293.12
1.2	1.32	12.67	8.79	38 132.64	4 427.36
1.4	1.13	10.96	7.05	33 029.92	3 795.68
1.6	0.99	9.63	5.72	29 034.88	3 312.96

部件	电导率/（mΩ·mm）^-1
铜板	55.6
金属极板	1.35
GDL	0.001 25

部件	尺寸/mm	密度/ （kg·m^-3）	弹性模量/MPa	泊松比	屈服强度/MPa
双极板^［14-15］	60×135×0.1	7 800	200 000	0.30	296
GDL^［16］	60×112×0.19	440	7.47	0.28
端板^［19-20］	520×210×30	2 800	69 000	0.33	260
螺栓^［20-21］		7 850	209 000	0.28	215
密封胶^［21］	60×4×0.69	1 000		0.49

区域	试验平均接触应力/MPa	仿真平均接触应力/MPa	误差/%
1	0.82	0.84	2.69
2	0.77	0.83	7.42
3	0.80	0.85	6.12
4	0.85	0.83	-2.12
5	0.75	0.84	12.15
6	0.76	0.85	11.55
7	0.87	0.82	-6.07
8	0.75	0.84	11.41
9	0.82	0.85	4.29

工况	短堆冲击方向	短堆初速度/（m·s^-1）	单电池所处层
封装阶段			1
X_4_2	X	4	2
X_4_3			3
X_4_4			4
X_4_5			5
X_6_2	X	6	2
X_6_3			3
X_6_4			4
X_6_5			5
X_8_2	X	8	2
X_8_3			3
X_8_4			4
X_8_5			5
Y_4_1	Y	4	1
Y_4_2			2
Y_4_3			3
Y_4_4			4
Y_4_5			5

Research on PEMFC Mechanical-Electrical Coupling Modeling and Electrical Response Under Impact Load

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References 25

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冲击方向	短堆初速度/（m·s^-1）
X	4
X	6
X	8
Y	4