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Proton exchange film fuel cell flow field structure

A proton exchange membrane and fuel cell technology, applied in fuel cells, solid electrolyte fuel cells, fuel cell components, etc., can solve the problems of gas short circuit, uneven gas distribution, dead zone, etc. The effect of high utilization rate and reduction of concentration polarization

Active Publication Date: 2007-03-14
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this flow field is that although the resistance drop is reduced, the gas short circuit caused by the resistance difference of each channel, resulting in uneven gas distribution, or the problem of dead zone has not been fundamentally solved.

Method used

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  • Proton exchange film fuel cell flow field structure
  • Proton exchange film fuel cell flow field structure
  • Proton exchange film fuel cell flow field structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] As shown in Figure 3, an example of a flow field, the mesh flow field uses two layers of stainless steel metal mesh of 100 mesh and 40 mesh, the baffles are made of flexible graphite, and the flexible graphite baffles are sandwiched between the two layers of metal mesh, using a hydraulic press Flatten the graphite strips and the metal mesh and fix the graphite strips; the distance between the graphite strips is 20 mm, and the gas channels left on the sides of the graphite strips account for a quarter to one third of the length of the entire graphite strips; the flow field is composed of mesh flow The reaction gas enters the flow field of the fuel cell from the air inlet, and under the restriction of the baffle strip, the gas is deflected and passes through the entire flow field evenly, so that the gas is evenly distributed on the entire electrode surface. It also avoids the problem of gas short-circuiting and achieves the purpose of controllable gas flow, thereby improvi...

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Abstract

The present invention relates to proton exchange membrane fuel cell. The flow field structure of proton exchange membrane fuel cell consists of netted flow field and deflecting stripes. The deflecting stripes are set inside the netted flow field and parallel to one group of sealing side walls, and have width equal to the height of the netted flow field. Each of the deflecting stripes has one end connected perpendicularly to the side wall and the other end constituting the gas channel. The gas channel has width not smaller than that of the gas inlet. The present invention has the advantages of high pole area utilization, being favorable to the exhaust of water produced in the electrochemical reaction and the elimination of inertial component, no dead arean of gas flow, and stable operation of the cell under low pressure and normal pressure.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a flow field structure of the proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) uses perfluorosulfonic acid solid polymer as electrolyte, platinum / carbon or platinum-ruthenium / carbon as electrocatalyst, hydrogen or purified reformed gas as fuel, air or pure oxygen as oxidant, Graphite or surface-modified metal plates with gas flow channels are bipolar plates; Figure 1 is a schematic diagram of the working principle of PEMFC. [0003] The electrode reactions in PEMFC are similar to other acid electrolyte fuel cells. The hydrogen in the anode catalytic layer undergoes an electrode reaction under the action of the catalyst <chemistry num="001"> <chem file="200310105202_cml001.xml" / > < / chemistry> , the electrons generated by the electrode reaction reach the cathode through the external circuit, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M8/10H01M4/86H01M8/0258H01M8/026
CPCY02E60/521Y02E60/50
Inventor 徐洪峰徐乃涛刘常富阳贻华
Owner SUNRISE POWER CO LTD
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