Features for barrier film support
A barrier film for a fuel cell is provided, including a polymeric membrane having a plurality of support features. The support features are adapted to militate against a deflection of the membrane under a pressure differential across the membrane. A fuel cell employing the barrier film has a first plate with a port formed therein, and a second plate disposed adjacent the first plate. The barrier film is disposed between the first plate and the second plate. The support features of the barrier film militate against an intrusion of the membrane into the port. A fuel cell stack formed from a plurality of the fuel cells is also provided.
1. A fuel cell, comprising:
a first plate having a port and a manifold aperture formed therein, the port disposed inboard from the manifold aperture;
a second plate having a manifold aperture formed therein and disposed adjacent the first plate, the first plate and the second plate having flow fields formed thereon, each of the flow fields including a plurality of flow channels defined by a plurality of lands;
a barrier film disposed between the first plate and the second plate, a volume between the first plate and the second plate adjacent a supply manifold formed by an alignment of the manifold apertures in the first plate and the second plate defining a feed region of the fuel cell, the barrier film disposed in the feed region, wherein the barrier film is a polymeric membrane having at least one deflectable portion adjacent the port and a seal formed thereon between the deflectable portion and the supply manifold outboard from the port, the seal abutting each of the first plate and the second plate, the deflectable portion further having a plurality of support features, the support features disposed between at least one of the lands of the second plate and the flow channels of the first plate and the flow channels of the second plate and the flow channels of the first plate, and a height of the support features being greater than a thickness of the deflectable portion of the barrier film, each of the support features abutting the first plate at a position adjacent and inboard from the port to militate against an intrusion of the barrier film into the port due to a pressure differential across the barrier film;
an anode;
an electrolyte membrane; and
a cathode, wherein the anode, the electrolyte membrane, and the cathode are disposed between the first plate and the second plate in an active region, the electrolyte membrane coupled to the barrier film, and wherein the cathode, the anode, and the electrolyte membrane do not extend substantially into the feed region.
2. The fuel cell of claim 1 , wherein the support features are at least one of integral with the membrane and deposited on the barrier film.
3. The fuel cell of claim 1 , wherein one of the support features is a substantially solid node.
4. The fuel cell of claim 1 , wherein one of the support features is a hollow node formed from the barrier film.
5. The fuel cell of claim 4 , wherein the hollow node is formed by one of a molding operation and a stamping operation.
6. The fuel cell of claim 4 , wherein a base of the hollow node is spaced from a plane defined by a surface of the barrier film.
7. The fuel cell of claim 1 , wherein the plurality of support features has a substantially columnar alignment on the barrier film.
8. The fuel cell of claim 1 , wherein the plurality of support features includes a first quantity of support features spaced apart from a second quantity of support features.
9. The fuel cell of claim 8 , wherein the first quantity and the second quantity of support features are arranged in columns substantially parallel to one another.
10. The fuel cell of claim 8 , wherein the first quantity and the second quantity of support features bias the membrane in a desired direction.
11. The fuel cell of claim 1 , wherein the plurality of support features has a staggered alignment on the barrier film.
12. The fuel cell of claim 1 , wherein the barrier film is formed from at least one of a polyethylene terephthalate (PET), a polyethylene naphthalate (PEN), and a polyimide polymer.
13. The fuel cell of claim 1 , wherein the barrier film is laminated from a plurality of membrane layers.
14. A fuel cell stack comprising:
a plurality of fuel cells, at least one of the fuel cells further comprising:
a first plate having a port and a manifold aperture formed therein, the port disposed inboard from the manifold aperture;
a second plate having a manifold aperture formed therein and disposed adjacent the first plate, the first plate and the second plate having flow fields formed thereon, each of the flow fields including a plurality of flow channels defined by a plurality of lands;
a barrier film disposed between the first plate and the second plate, a volume between the first plate and the second plate adjacent a supply manifold formed by an alignment of the manifold apertures in the first plate and the second plate defining a feed region of the fuel cell, the barrier film disposed in the feed region, wherein the barrier film is a polymeric membrane having at least one deflectable portion adjacent the port and a seal formed thereon between the deflectable portion and the supply manifold outboard from the port, the seal abutting each of the first plate and the second plate, the deflectable portion having a plurality of support features, the support features disposed between at least one of the lands of the second plate and the flow channels of the first plate and the flow channels of the second plate and the flow channels of the first plate, and a height of the support features being greater than a thickness of the deflectable portion of the barrier film, each of the support features abutting the first plate at a position adjacent and inboard from the port to militate against an intrusion of the barrier film into the port due to a pressure differential across the barrier film;
an anode;
an electrolyte membrane; and
a cathode, wherein the anode, the electrolyte membrane, and the cathode are disposed between the first plate and the second plate in an active region, the electrolyte membrane coupled to the barrier film, and wherein the cathode, the anode, and the electrolyte membrane do not extend substantially into the feed region.