The present invention provides for a construction for a bipolar plate for
a fuel cell stack that enables the bipolar plate to be a more compliant
member in the fuel cell stack. The bipolar plate can be configured to
provide varying levels of compliance, as demanded by the design of the
fuel cell stack. The bipolar plate can be more compliant than the
diffusion media members and the active elements used to form the
individual fuel cells. The compliant nature of the individual bipolar
plates enables localized dimensional changes that occur within the fuel
cell stack to be compensated by a localized deformation of the portions
of the bipolar plate within that region. The bipolar plate has an
internal coolant flow field where some opposing pairs of lands are spaced
apart with a gap therebetween while other opposing pairs of lands are in
contact with one another.