Molded fuel cell plates with seals
View Patent ↗A fuel cell unit incorporates a pair of plates; one plate an anode, the other a cathode. Respective anode and cathode plates are physically bonded together to form such pairs; wherein pluralities of the pairs are secured together to form commercially available fuel cells utilized to generate electric power. Seals employed between respective pairs of plates are in the nature of resilient beads arranged about selected areas of the plates to confine paths for fluids adapted to flow within said selected areas. A combination sealing and bonding method for manufacturing such fuel cell units involves the injection of a rapidly curable liquid silicone into aligned mold gating apertures of the respective pairs of the plates, whereby liquid silicone flows through and between the plates to a) seal between respective anode and cathode plates pairs and to b) form an insulation layer on the backside of the anode.
1. An electrolytic fuel cell, comprising:
two plates having opposing surfaces generally facing one another, each of said plates having at least one aperture wherein said apertures of opposing plates are generally aligned when said plates are facing one another; and
a unitary, contiguous, resilient media that substantially fills said at least one aperture and which forms a bead extending entirely about a periphery of at least one of said plates, said resilient media having first and second regions, said first region sealingly disposed between portions of said plates, said second region sealingly disposed about a non-facing side of one of said plates, a portion of said second region completing part of said bead;
wherein said second region entirely surrounds a channel, said channel extending between said plates such that a liquid can pass between said plates, said first region extending from said portion of said second region that completes part of said bead through one of said plates to the other of said plates adjacent said channel while said second region does not extend through either of said plates.
2. The electrolytic fuel cell as claimed in claim 1 wherein said second region of said resilient media has a thickness greater than the thickness of said first region.
3. The electrolytic fuel cell as claimed in claim 1 wherein said second region of said resilient sealing media is an insulation layer.
4. The electrolytic fuel cell as claimed in claim 1 wherein each of said at least one apertures are further adapted for communicating said resilient material such that said media may be communicated therethrough.
5. The electrolytic fuel cell as claimed in claim 4 wherein said resilient sealing media is pressurably directed into said apertures to form both said first and second regions.
6. The electrolytic fuel cell as claimed in claim 1 wherein said resilient media is formed of a silicone material.
7. A method of making an electrolytic fuel cell unit in a mold, the electrolytic fuel cell unit having a pair of fuel cell plates each having at least one aperture, and a unitary, contiguous, resilient media sealingly disposed therebetween and thereunder said method comprising the steps of:
aligning said pair of fuel cell plates in proximity with one another such that each of said at least one apertures are generally aligned; and
pressurably communicating said resilient media through each of said at least one apertures such that said media substantially fills each of said at least one apertures, said media forming a bead extending entirely about a periphery of at least one of said plates and is disposed between said plates and a space between the bottom plate and a floor of the mold, said media further surrounding a liquid transmitting channel that extends between said plates, said media surrounding said channel disposed about a non-facing side of one of said plates;
wherein said media in said aperture extends from one plate to the other plate only where a portion of said media forms an outer peripheral wall about said channel, said wall comprising a portion of said periphery about said at least one plate.
8. The method for making an electrolytic fuel cell unit as claimed in claim 7 wherein said sealing media is a silicone material.
9. The method for making an electrolytic fuel cell unit as claimed in claim 7 further comprising the step of permitting said media to cure.
10. The method for making an electrolytic fuel cell unit as claimed in claim 7 wherein said pressure is substantially between about 300 and 700 pounds per square inch.
11. The method for making an electrolytic fuel cell unit as claimed in claim 7 wherein a temperature is substantially between about 300 and 400 degrees Fahrenheit.