Patent ID: 9705139
Date: 2017-07-11
CPC Classifications: H01M,Y02E

Claim:
1. A method comprising; a) screen printing a first sealing layer on a first flow field plate, the first sealing layer defining a first pattern and having a first predetermined sealing layer thickness; b) forming a multilayer seal by screen printing a second sealing layer over the first sealing layer, the second sealing layer defining a second pattern and having a second predetermined sealing layer thickness; c) screen printing a third sealing layer over a first side of a second flow field plate having a third predetermined sealing layer thickness; d) screen printing a fourth sealing layer over a second side of the second flow field plate having a fourth predetermined sealing layer thickness; and e) combining the first flow field plate and the second flow field plate to form flow channels for guiding reactants to a fuel cell catalyst layer, wherein one of the first flow field plate and the second flow field plate is an anode flow field plate and one of one of the first flow field plate and the second flow field plate is a cathode flow field plate, wherein the first sealing layer is formed by: providing a first screen having a first resinous masking material disposed thereon in a first masking pattern, the first resinous masking material blocking flow through the first screen, the first resinous masking material extending a first predetermined masking layer thickness from the first screen; and applying a first curable seal composition to the first screen such that the first curable seal composition flows through the screen at locations not blocked by the first resinous masking material and onto the first flow field plate; and at least partially curing the first curable seal composition to form the first sealing layer; and wherein the second sealing layer is formed by: providing a second screen having a second resinous masking material disposed thereon in a second masking pattern, the second resinous masking material blocking flow through the second screen, the second resinous masking material extending a second predetermined masking layer thickness from the second screen; applying a second curable seal composition to the second screen such that the second curable seal composition flows through the second screen at locations not blocked by the second resinous masking material and onto the first sealing layer; and at least partially curing the second curable seal composition to form the second sealing layer.