Patent ID: 9634345
Date: 2017-04-25
CPC Classifications: H01M,Y02E

Claim:
1. A flow field plate for a fuel cell comprising: a major surface for distribution of a reactant; an inlet reactant port for the inlet of the reactant; an outlet reactant port for the outlet of the reactant; and a reactant flow field formed in the major surface of the plate, the reactant flow field including a reactant flow field inlet fluidly connected to the inlet reactant port, the reactant flow field including a reactant flow outlet fluidly connected to the outlet reactant port, the reactant flow field comprising a parallel channel region comprising a plurality of essentially parallel channels and landings separating the channels, and the parallel channel region comprising at least one protrusion region wherein each channel of the plurality of parallel channels respectively comprises a sequence of protrusions, each protrusion partially obstructing flow in the channels; wherein the protrusions in each channel are arranged in a regular sequence along the length of each channel, wherein the regular sequence is a recurring periodic sequence or a regular but not periodic sequence wherein spacings are harmonics of the shortest spacing; wherein the reactant flow field is an oxidant flow field, wherein said oxidant includes oxygen; wherein, in a protrusion region near the outlet port, protrusions having bigger dimensions or more protrusions are provided, and wherein the protrusions in each channel in the protrusion region are offset along the channel length with respect to the protrusions in each immediately adjacent channel.