A multicell assembly for a redox flow electrolyzer is constituted by alternately
stacking pre-assembled elements, typically an electrode subassembly including porous
mat electrodes on opposite faces of a conductive plate and a permionic membrane
subassembly. Pressure drops in circulating the electrolyte solutions through respective
cell compartments, in contact with fluid permeable three-dimensional electrodes
in the form of porous mats, are reduced while enhancing evenness of electrolyte
refreshing over the whole geometrical cell-area, by defining cooperatively interleaved
flow channels in the porous mat electrode. Two interleaved orders of parallel flow
channels are defined. All the parallel spaced channels of each order extend from
a common orthogonal base channel formed along the respective inlet or outlet side
of the electrolyte flow chamber, and terminate short of reaching the base channel
of the other. The flow channels include comb-shaped flow distributing channelworks
having parallel fingers which interleave with each other.
