Page 56 - Introduction to Transfer Phenomena in PEM Fuel Cells
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Introduction to Hydrogen Technology 45
Figure 1.19. The different types of bipolar plate [COL 08].
a) Coiled flow channels; b) multiple coil flow channels;
c) parallel flow channels; d) interdigitated flow channels
1.3.2. PEMFC design and configuration
Since most electrical devices require voltage levels and power that cannot
be produced by a single cell, in fuel cells, a number of cells are connected in
series forming a “battery” [COL 08]. These cells, all-similar, are separated
by plates allowing the flow of fluids and form what is known as a stack (see
Figure 1.20).
Increasing the number of cells in the stack amplifies the voltage
produced, while increasing the area of each cell increases the available
current. In the traditional design of bipolar batteries, fuel cells have many
cells (or elements) connected in series. The cathode of a cell is connected to
the anode of the next cell.
MEAs, seals, bipolar plates and endplates are the typical layers of a fuel
cell. These cells are assembled firmly.
