Patent Application
20070254202
The present invention would be detailed described in the following to make the skilled in the art understand the object, features and effects of the present invention through the following embodiments and the attached figures, wherein:
The substrate 11 could be selected with one from anti-chemical non-conductive engineering plastic substrate, graphite substrate, metal substrate, plastic carbon substrate, FR4 substrate, FR5 substrate, epoxy resin substrate, glass-fiber substrate, ceramic substrate, polymer plasticized substrate, and composite material substrate. If the inlet channel structure 12, at least one slot body 13, the outlet channel structure 14, the first hollow area 15, and the second hollow area 16 are configured on the upper surface of substrate 11, they will form a one-sided cathode flow field board 1. On the other hand, if the inlet channel structure 12, at least one slot body 13, the outlet channel structure 14, the first hollow area 15, and the second hollow area 16 are configured both on the upper surface and the lower surface of the substrate 11, they will form a two-sided cathode flow field board 1.
The inlet channel structure 12 is configured on the substrate 11, and connected to at least one slot body 14. The inlet area of the inlet channel structure 12 is to dig the surface of the substrate 11 as a groove structure. And, the area of the inlet channel structure 12 connected to these slot bodies 13 employs a hollow structure, that is, the surface of the substrate 11 occupied by the connected areas are dug as hollow.
At least one slot body 13 are arranged and configured on the substrate 11, and each configured position of each slot body 13 is correspondingly associated with the configured position of the cathode for each membrane electrode assembly. The means for realizing these slot bodies 13 are dug from the surface of the substrate 11 to form a plurality of parallel slots.
The external cathode fuel, such as air, from the inlet channel structure 12 will flow into inside the cathode flow field board 1; then, the cathode fuel is introduced into each slot body 13; finally, flowing to the cathode of each membrane electrode assembly; furthermore, the cathode product, such as water, generated by the electrochemical reaction for the cathode of each membrane electrode assembly will flow into each slot body 13; and, the cathode product and the residual cathode fuel will flow to the outlet channel structure 14.
The outlet channel structure 14 is configured on the substrate 11, and connected to these slot bodies 13. The outlet channel structure 14 could employ a plurality of parallel slots, and these slots are connected to the slot bodies 13. The cathode product and the residual cathode fuel will flow through the outlet channel structure 14, and flow out to the external of the cathode flow field board 1.
Furthermore, the present invention further comprises at least one current collector sheet 17. Please refer to
Moreover, a conductive sheet is further attached and sandwiched between each current collector sheet 17 and each slot body 13 (not shown). The conductive sheet could employ the high conductivity material, and could be chosen to use the spot-welding method, so as to bond these conductive sheet layers between these electricity collection sheets 17 and these slot bodies 13; or, with thermal press machine, employing a resin Prepreg or a bonding agent with anti-erosion and/or anti-acid function, such as AB glue, to press and bond these conductive sheets between these current collector sheets 17 and these slot bodies 13. Furthermore, it could choose to use the sputtering and spraying process to form a layer of thin metal layer on the bottom surface of the current collector sheet 17; or, forming a layer of thin metal layer on the upper surface of the slot body 13. The material for the conductive sheet and thin metal layer could be selected from one of gold, copper, silver, carbon, high conductivity metal.
The conductive sheet is provided with at least one flange, and these flanges are protruded from the slot bodies 13.
The cathode flow field board 1 according to the present invention could be applied in various types of fuel cells, such as the fuel cell using methanol fuel, or the fuel cell using liquid fuel, the fuel cell using gas fuel, and the fuel cell using solid fuel, etc.
The cathode flow field board according to the present invention could have an extremely light overall weight, and low manufacturing cost, and provide the cathode fuel and cathode product with a fluid field environment for smoothly flowing, which disclose the advantages, effects and improvements in the present invention.
The present invention has been described as above. Thus, the disclosed embodiments are not limiting the scope of the present invention. And, for the skilled in the art, it is well appreciated that the change and modification without departing from the claims of the present invention should be within the spirit and scope of the present invention, and the protection scope of the present invention should be defined with the attached claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 095207401 | May 2006 | TW | national |
