High-power fuel cell modeling and voltage uniformity analysis

doi:10.19799/j.cnki.2095-4239.2023.0630

Abstract

Abstract:

With the advancement of fuel cell stack technology for the development of higher power outputs, operational disparities among individual cells have become more apparent. Longevity of a cell subjected to prolonged poor operating conditions is markedly diminished compared to its counterparts, often becoming a decisive factor in determining the overall stack lifespan. Thus, to assess the effects of varied operational parameters on achieving uniform performance in high-power fuel cells, a comprehensive 110 kW, high-power fuel cell model was developed. This model encompasses a fluid network, fuel cell voltage, and fuel cell thermal resistance models. Subsequently, a steady-state test was executed to validate the fuel cell model, revealing that the error between simulation and test results remained within a 5% margin. Employing the model simulations, maximum deviation rate of voltage was utilized as the evaluation criterion to analyze the influence of three key operating parameters: operating current, cooling water flow rate, and cooling water inlet temperature on the voltage uniformity of the fuel cell. Thus, the simulation results indicate that the operating current exerts the most pronounced impact on the voltage uniformity of the fuel cell, followed by the cooling water inlet temperature, with the cooling water flow rate exhibiting the test influence. This study offers valuable insights for guiding the structural optimization design of high-power fuel cell engines and the formation of thermal management control strategies.

Key words: fuel cell, voltage uniformity, maximum deviation rate

CLC Number:

TK 91

Minjie BAO, Xiaoli YU, Rui HUANG, Junxuan CHEN, Xiaoyang CHEN, Wenbin ZHI. High-power fuel cell modeling and voltage uniformity analysis[J]. Energy Storage Science and Technology, 2024, 13(3): 952-962.

Figures/Tables 16

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名称	参数	单位
双极板尺寸	471×104×2	mm
单体数量	260	个
活化面积	300	cm²
氢气歧管横截面积	318	mm²
氧气歧管横截面积	635	mm²
冷却水歧管横截面积	590	mm²

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