Fuel Cell Interconnect Varying Channel Cross-Sectional Area

The patent applies local quality by varying the cross-sectional area of gas flow channels in different regions of the interconnect. Specifically, channels in later layers (further from the fuel inlet) have larger cross-sectional areas to compensate for reduced fuel flow, while channels in earlier layers have smaller areas. This localized modification of channel geometry ensures uniform fuel distribution across all layers without requiring complex manufacturing processes, thus resolving the contradiction between manufacturing simplicity and fuel cell efficiency.

The patent employs parameter changes by systematically varying the cross-sectional area parameter of the gas flow channels based on their position in the stack. The channel area is increased in later layers to compensate for pressure drop and ensure uniform fuel distribution. This controlled parameter variation achieves the desired fuel distribution uniformity while maintaining a relatively simple overall device structure, as the change is limited to one geometric parameter (channel area) rather than introducing complex multi-dimensional variations.

The patent applies segmentation by dividing the fuel cell stack into multiple layers, each with appropriately sized gas flow channels. The interconnect is segmented into regions corresponding to different layers, with each region having channels of specific cross-sectional area. This segmentation approach allows the varying channel areas to be manufactured using standard techniques by treating each layer's interconnect as a separate component, thereby reducing the overall manufacturing precision requirements compared to attempting to manufacture a single complex interconnect with continuously varying channel areas.