Integrated circuit for diagnostics

1. A fuel cell system comprising:

a membrane electrode assembly;

a first plate separator and a second plate separator on opposite sides of said membrane electrode assembly, said first plate separator and said second plate separator having exterior ends away from said membrane electrode assembly;

a first gas diffusion layer between the first plate separator and the membrane electrode assembly;

a second gas diffusion layer between the second plate separator and the membrane electrode assembly;

a subgasket extending from the membrane electrode assembly laterally toward at least one of said exterior ends;

a first seal located between the first plate separator and the subgasket;

a conductive trace attached to said subgasket and extending on said subgasket from an exterior side of said first seal to a location on an interior side of said first seal.

2. The system of claim 1 wherein said subgasket comprises a first top side adjacent said first seal and said first gas diffusion layer and a second bottom side adjacent said second gas diffusion layer, said conductive trace located on said first top side and a second conductive trace located on said second bottom side.

3. The system of claim 2 wherein said second trace extends through said subgasket to said first side to allow an electrical connection between said first trace and said second trace and a sensor or controller.

4. The system of claim 1 wherein said subgasket and said trace extend outwardly past said at least one of said exterior ends.

5. The system of claim 1 wherein said trace extends from said first gas diffusion layer between said first seal and said subgasket toward said exterior end.

6. The system of claim 1 wherein said conductive trace comprises a first linear portion extending from said exterior side of said first seal toward said membrane electrode assembly and said conductive trace further comprising an upwardly extending portion extending toward said first plate separator.

7. The system of claim 1 wherein said subgasket comprises a tab extending beyond at least one of said exterior ends in a direction away from said membrane electrode assembly, said conductive trace extending on said subgasket past at least one of said exterior ends, said tab having a longitudinal axis in a direction away from at least one of said exterior ends.

8. The system of claim 7 wherein said subgasket further comprises a second trace on a same side of said subgasket as said conductive trace.

9. The system of claim 7 further comprising a second subgasket connected to a second membrane electrode assembly, said subgasket and said second subgasket vertically spaced along a vertical axis connecting said first plate separator and said second plate separator, said second subgasket comprising a second tab, said second tab located in a lateral direction relative to said first tab, such that said first tab and said second tab are vertically offset relative to each other and non-vertically aligned.

10. The system of claim 1 wherein said conductive trace is a metal trace printed on said subgasket.

11. The system of claim 1 wherein said membrane electrode assembly, said first gas diffusion layer, said second gas diffusion layer are bonded to said subgasket.

12. The system of claim 8 wherein said conductive trace and said second trace comprise a thermocouple junction.