This Application claims priority of Taiwan Patent Application No. 98118674, filed on Jun. 5, 2009, the entirety of which is incorporated by reference herein.
1. Field of the Invention
The invention relates to a fuel cell module, and in particular, to a fuel cell module comprising a current collector, which aids to rapidly exhaust carbon dioxide from the fuel cell.
2. Description of the Related Art
Direct oxidation fuel cells comprise current collectors to collect current produced by anodes and allow carbon dioxide produced by the membrane electrode assemblies (MEA) to exhaust to the anode flow field plate. In detail, fuel enters the anode flow field plate from an end of the fuel cell, and flows through the openings of the current collector to the MEA. The fuel reacts with the anode and produce carbon dioxide in the MEA. Carbon dioxide then flows back to the anode flow field plate through the openings of the current collector, and then out through another end of the fuel cell.
The conventional current collector has a plurality of tiny openings. When carbon dioxide flows through the openings, due to capillary attraction, it easily gets stuck in the openings and is prevented from flowing to the anode flow field plate. Because exhaustion of carbon dioxide indirectly affects fuel cell efficiency, improving flow of carbon dioxide through the openings to the anode flow field plate is desired.
Accordingly, the invention provides a fuel cell module. The fuel cell module includes a membrane electrode assembly, a flow field plate and a current collector. The current collector, disposed between the membrane electrode assembly and the flow field plate, includes a first surface, a second surface and a plurality of openings. The first surface faces the membrane electrode assembly. The second surface is opposite to the first surface and faces the flow field plate. Each of the openings has an inner wall, and an acute angle is formed between the inner wall and the first surface.
In an embodiment, the current collector includes a first surface, a second surface and a plurality of openings. The second surface is opposite to the first surface and the openings penetrate through the first surface and the second surface. Additionally, each opening has a first diameter level with the first surface and a second diameter level with the second surface, wherein the first diameter is smaller than the second diameter.
A detailed description is given in the following embodiments with reference to the accompanying drawings.
The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
Referring to
Two of the four current collectors 120 are disposed on one side of the anode flow field plate 110, while the other two of the four current collectors 120 are disposed on the other side of the anode flow field plate 110. The two MEAs 130 are disposed on two sides of the anode flow field plates 110, respectively, such that the current collectors 120 are respectively clamped between the anode flow field plate 110 and the two MEAs 130. The two cathode plates 140 are also disposed on two sides of the anode flow field plates 110, respectively, such that the MEAs 130 are clamped between the anode flow field plates 110 and the two cathode plates 140.
Referring to
Referring to
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While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Number | Date | Country | Kind |
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TW098118674 | Jun 2009 | TW | national |