Planar fuel cell stacks

The interconnect normally links the anode of one cell to the cathode of the next. It must, of course, be an electronic conductor and also a gas barrier preventing the direct meeting of fuel and oxidant gases. Fig. 4.27 illustrates how the interconnection is achieved in the case of the so-called planar fuel cell stack. In the later discussion of the ceramics-based cells a tubular configuration is described, but the principles are the same. 

Figure 3.9. Visualisation of the physical structure of a planar fuel cell stack...

When you have finished soldering the series connections, the positive (oxygen) side of each cell will be connected to the negative (hydrogen) side of the next cell in series, so the voltage from each cell is added to get the total output of this planar fuel cell stack. 

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