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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 uneven gas distribution, gas short circuit, dead zone, etc., and achieve high area utilization , short structure, reducing the effect of concentration polarization

Active Publication Date: 2005-06-01
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
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Effect test

Embodiment 1

[0030] Such as image 3 As shown in the example of a flow field, the mesh flow field uses 100 mesh and 40 mesh two-layer stainless steel metal mesh, the baffle is made of flexible graphite, the flexible graphite baffle is sandwiched between the two metal meshes, and the graphite strip is clamped by a hydraulic press Flatten and fix the graphite strip with the metal mesh; the spacing between the graphite strips is 20 mm, and the gas channel left on the side of the graphite strip accounts for a quarter to one third of the length of the entire graphite strip; Composed of flow bars, the reaction gas enters the flow field of the fuel cell from the air inlet. Under the restriction of the baffle bars, the gas is deflected and evenly passes through the entire flow field, so that the gas is evenly distributed on the entire electrode surface, and avoids The gas short-circuit problem achieves the goal of controllable gas flow, thereby improving electrode utilization efficiency, uniform curre...

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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 a proton exchange membrane fuel cell. Background technique [0002] The proton exchange membrane fuel cell (PEMFC) uses perfluorosulfonic acid type solid polymer as electrolyte, platinum / carbon or platinum-ruthenium / carbon as electrocatalyst, hydrogen or purified reformed gas as fuel, and air or pure oxygen as oxidant. Graphite or surface-modified metal plates with gas flow channels are bipolar plates; figure 1 Schematic diagram of the working principle of PEMFC. [0003] The electrode reaction in PEMFC is similar to other acid electrolyte fuel cells. The hydrogen in the anode catalyst layer undergoes 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, and the h...

Claims

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Application Information

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