Process for producing carbon-cladded composite bipolar plates for fuel cells
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United States of America Patent
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Issued Date -
Jun 26, 2008
app pub date -
Dec 26, 2006
filing date -
Dec 26, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention provides a process for making a carbon-cladded composite composition for use as a fuel cell flow field plate or bipolar plate. In one preferred embodiment, the process comprises (a) providing a layer of conductive filler-resin composite having a first and a second primary surface; (b) depositing two clad layers of conductive carbon or graphite material onto the two primary surfaces, respectively, to produce a clad-composite-clad (three-layer) precursor structure; (c) creating flow field channels on the two primary exterior surfaces of the three-layer precursor; and (d) curing or solidifying the resin to form the desired bipolar plate. These steps are preferably integrated into a continuous roll-to-roll process for the mass production of bipolar plates. The conductive carbon or graphite material preferably comprises particles selected from the group consisting of carbon fibers, carbon nano-tubes, graphitic nano-fibers, nano-scaled graphene plates, carbon blacks, fine graphite powder, and combinations thereof.
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