A bipolar plate for an electrochemical cell having a first layer, a second
layer, and a third layer is disclosed. The first layer has a first
plurality of through channels oriented in a first direction. The second
layer has a second plurality of through channels oriented in a second
different direction. The third layer is disposed between and bonded to
the first and second layers. The third layer has a first set of header
channels in fluid communication with the first plurality of channels, and
a second set of header channels in fluid communication with the second
plurality of channels. A first inlet port and a first outlet port are in
fluid communication with the first set of header channels, and a second
inlet port and a second outlet port are in fluid communication with the
second set of header channels. The bonded third layer prevents fluid
communication between the first plurality of channels and the second
plurality of channels.