Fuel cell subassemblies incorporating subgasketed thrifted membranes

• US 9,276,284 B2
• Filed: 12/09/2013
• Issued: 03/01/2016
• Est. Priority Date: 12/22/2009
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Iverson, Eric J., Pierpont, Daniel M., Yandrasits, Michael A., Hamrock, Steven J., Obradovich, Stephan J., Peterson, Donald G.
• Primary Examiner(s): DOUYETTE, KENNETH J
• Application Number:
  US14/100,132
• Publication Number:
  US 20140093807A1
• Time in Patent Office: 813 Days
• Field of Search: 429/465, 429/457, 429/508, 429/509, 429/479, 429/480, 429/535, 429/416, 429/435, 429/483, 156/182, 156/252
• US Class Current: 1/1
• CPC Class Codes: H01M 2008/1095 Fuel cells with polymeric electrolytes
• CPC Class Codes: H01M 8/0273 with sealing or supporting means in the form of a frame
• CPC Class Codes: H01M 8/0276 Sealing means characterised by their form H01M8/0273 takes precedence
• CPC Class Codes: H01M 8/0286 Processes for forming seals
• CPC Class Codes: H01M 8/1004 characterised by membrane-electrode assemblies [MEA] H01M8/12 takes precedence
• CPC Class Codes: H01M 8/1016 characterised by the electrolyte material H01M8/12 takes precedence
• CPC Class Codes: H01M 8/2418 Grouping by arranging unit cells in a plane H01M8/2425, H01M8/244 take precedence
• CPC Class Codes: H01M 8/242 comprising framed electrodes or intermediary frame-like gaskets H01M8/2425, H01M8/244 take precedence
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A fuel cell roll good subassembly is described that includes a plurality of individual electrolyte membranes. One or more first subgaskets are attached to the individual electrolyte membranes. Each of the first subgaskets has at least one aperture and the first subgaskets are arranged so the center regions of the individual electrolyte membranes are exposed through the apertures of the first subgaskets. A second subgasket comprises a web having a plurality of apertures. The second subgasket web is attached to the one or more first subgaskets so the center regions of the individual electrolyte membranes are exposed through the apertures of the second subgasket web. The second subgasket web may have little or no adhesive on the subgasket surface facing the electrolyte membrane.

Claims

1. A fuel cell roll good subassembly, comprising:

a plurality of individual electrolyte membranes, each electrolyte membrane comprising a center region;

one or more first subgaskets attached to the individual electrolyte membranes, each of the first subgaskets having at least one aperture, the first subgaskets arranged so that the center regions of the individual electrolyte membranes are exposed through the apertures of the first subgaskets;

a second subgasket comprising a web having a plurality of apertures, the second subgasket web arranged so that center regions of the individual electrolyte membranes are exposed through the apertures of the second subgasket web;

a first catalyst coated gas diffusion layer, wherein the one of the first subgaskets is positioned between the first catalyst coated gas diffusion layer and one of the electrolyte membranes; and

a second catalyst coated gas diffusion layer, wherein the one of the second subgasket is positioned between the second catalyst coated gas diffusion layer and one of the electrolyte membranes,

each of the one or more first subgaskets comprises a first subgasket layer having a first subgasket surface oriented toward the electrolyte membrane, the first subgasket having a first adhesive layer disposed on the first subgasket surface; and

the second subgasket comprises a second subgasket layer having a second subgasket surface oriented toward the electrolyte membrane, wherein a second adhesive layer is not disposed on substantial portions of the second subgasket surface

wherein the first gasket aperture and the second gasket aperture are different sizes.

2. The roll good subassembly of claim 1, wherein the first adhesive layer of each of the one or more first subgaskets is attached to the second subgasket surface.

3. The roll good subassembly of claim 1, wherein the one or more first subgaskets is one first subgasket comprising a web having a plurality of apertures.

4. The roll good subassembly of claim 1, wherein the first gasket aperture and the second gasket aperture are different sizes.

5. The fuel cell roll good subassembly of claim 4, wherein the first gasket aperture is smaller than the second gasket aperture.

6. A fuel cell roll good subassembly, comprising:

a plurality of individual electrolyte membranes, each electrolyte membrane comprising a center region, wherein at least some of the electrolyte membranes are catalyst coated electrolyte membranes comprising a first catalyst, a second catalyst, and an electrolyte membrane having first and second generally opposed major surfaces and first and second generally opposed edges, and wherein the first catalyst is on the first major surface, wherein the second catalyst is on the second major surface wherein the first and second generally opposed edges of at least one of the electrolyte membranes, first catalyst, and second catalyst are co-terminus;

one or more first subgaskets attached to the individual electrolyte membranes, each of the first subgaskets having at least one aperture, the first subgaskets arranged so that the center regions of the individual electrolyte membranes are exposed through the apertures of the first subgaskets; and

a second subgasket comprising a web having a plurality of apertures, the second subgasket web arranged so that center regions of the individual electrolyte membranes are exposed through the apertures of the second subgasket web,

wherein the catalyst coated electrolyte membrane is thrifted on at least 2 opposing sides and wherein each of the one or more first subgaskets comprises a first subgasket layer having a first subgasket surface oriented toward the individual electrolyte membranes, each of the one or more the first subgaskets having a first adhesive layer disposed on the first subgasket surface; and

the second subgasket comprises a second subgasket layer having a second subgasket surface oriented toward the individual electrolyte membranes, wherein a second adhesive layer is not disposed on substantial portions of the second subgasket surface.

7. The roll good subassembly of claim 6, wherein the first adhesive layer of each of the one or more first subgaskets is attached to the second subgasket surface.

8. The roll good subassembly of claim 6, wherein the one or more first subgaskets is one first subgasket comprising a web having a plurality of apertures.

9. The roll good assembly of claim 6, further comprising gas diffusion layers disposed over the center regions of the individual electrolyte membranes.

10. The fuel cell roll good subassembly of claim 6, wherein the first gasket aperture is smaller than the second gasket aperture.