Abstract
We report on a model of a direct methanol fuel cell stack. The model is based on our recent model of a single cell with parallel straight channels. The stack model accounts for voltage loss due to in-plane currents in the bipolar plates and local “spots” of contact resistance. A 100 cell stack with a various number of spots is simulated. The effect of spots is twofold: they increase local current and polarization voltages in the unaffected part of the cells, and induce in–plane parasitic current in bipolar plates. The growth of local current in the unaffected part of the cells reduces limiting current density of the stack. The stronger stack contamination with the spots, the lower the limiting current density. In the studied range of parameters, voltage loss in the bipolar plates is negligible.
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