Performance simulation and key parameters in-plane distribution analysis of a commercial-size PEMFC

Commercial fuel cell stacks often have a large electrode area to obtain a high power output. Uniformity in-plane distribution of vital physical quantities plays a key role in improving cell performance and avoiding degradation. In this study, a three-dimensional two-fluid multiphase model is adopted to analyze the in-plane distribution characteristics of key parameters (reactant concentration, temperature, local current density, and membrane water content) for a large-scale PEMFC with an active area larger than 300 cm(2). The particular feature of the PEMFC studied is that there are gap zones near the edge between the bipolar plate and gas diffusion layer and membrane. The results show that for the structure without gap zones, the cell performance improved by about 1%. The non-uniformity of cathode reactant distribution is generally higher than that of the anode; The non-uiformity of temperature in the x direction is higher than that in the y direction (flow-direction). With the increase of average current density, the temperature in the membrane increases, and the membrane dehydrates gradually. The flow direction of coolant has a significant impact on the cell performance. When coolant is in the same direction as hydrogen, the cell performance decreases by about 3.75% at 0.8 A/cm(2).

Automated summary

Commercial fuel cell stacks with large electrode area are used for high power output. The uniformity in-plane distribution of key parameters is important for improving cell performance. This study analyzed the in-plane distribution characteristics of a large-scale PEMFC using a three-dimensional two-fluid multiphase model, showing that gap zones near the edge affect cell performance and that coolant flow direction has a significant impact. The results provide insights for optimizing fuel cells.