Cell voltage monitoring (CVM) pick-up assembly for a fuel cell stack
A cell voltage monitoring (CVM) pick-up assembly for a fuel cell stack includes a tab and a contact wire having two ends. A loop is located between the two ends to mount the wire on the tab to resiliently urge one end towards a fuel cell to provide electrical contact with it. Also disclosed is a fuel cell stack that includes a plurality of assemblies.
1. A fuel cells stack and a cell voltage monitoring (CVM) pick-up assembly, the assembly comprising:
A gasket located against a fuel cell plate in the fuel cell stack, the gasket having a tab extending away therefrom and having first and second openings receiving therein first and second non-conductive rods; and
A contact wire having first and second ends, a loop located between the ends and a contact area located between the loop and the second end, the loop being mounted on the first rod so that the first end is placed against the fuel cell plate so as to maintain electrical contact therewith; and the second end is placed against the second rod so that the second end is pointed away from the fuel cell plate and a part of the contact portion is a contact area between the second end and the second rod,
wherein the contact wire is a resilient member.
2. The assembly, according to claim 1 , in which the contact area, when in contact with the second rod, locates the second end of the contact wire away from the fuel cell plate.
3. The assembly, according to claim 1 , in which the first and second openings in the tab are spaced apart.
4. The assembly, according to claim 1 , in which the tab and the fuel cell plate are in the same plane.
5. The assembly, according to claim 1 , in which the tab extends away from the fuel cell plate.
6. The assembly, according to claim 1 , in which the resilient member is a torsion spring.
7. The assembly, according to claim 6 , in which the torsion spring is made from gold plated music wire.
8. The assembly, according to claim 1 , in which the gasket and the tab are made from polyethylene terephthalate (PET).
9. A fuel cell stack comprising:
A plurality of stacked fuel cell plates;
A plurality of gaskets located between each fuel cell plate, each gasket being located against a fuel cell plate in the fuel cell stack, the gaskets each having:
i) a tab extending away therefrom and having first and second openings receiving therein first and second non-conductive rods; and
ii) A contact wire having first and second ends, a loop located between the ends and a contact area located between the loop and the second end, the loop being mounted on the first rod so that the first end is placed against the fuel cell plate so as to maintain electrical contact therewith; and the second end is placed against the second rod so that the second end is pointed away from the fuel cell plate and a part of the contact portion is a contact area between the second end and the second rod,
wherein the contact wire is a resilient member.
10. The fuel cell stack, according to claim 9 in which two elongate non-conductive rods interconnect each tab.
11. The fuel cell stack, according to claim 9 , in which the second end of each contact wire extends away from the fuel cell to permit contact with an electronic device.
12. The fuel cell stack, according to claim 9 , in which the resilient member is made from gold plated music wire.
13. The fuel cell stack, according to claim 9 , in which the gasket and the tab are made from polyethylene terephthalate (PET).