Gas flow field for proton exchange membrane fuel cell

Abstract

The invention relates to a fuel cell with a proton exchange membrane and a gas flow field used thereof. The invention is characterized in that an exit and an entrance of the gas flow field are respectively provided with a section of reticular flow field, between which a parallel groove flow field is located. The reticular floe fields are connected with the parallel groove flow field. The invention has the advantages of small resistance, even gas distribution, simple structure and easy processing.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a gas flow field for the proton exchange membrane fuel cell. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy into electrical energy electrochemically. It does not go through a heat engine process, so it is not limited by the Carnot cycle, has high energy conversion efficiency, and is environmentally friendly. Due to these outstanding advantages, the research and development of fuel cell technology has attracted much attention from governments and large companies in recent years, and it is considered to be the preferred clean and efficient power generation method in the 21st century. [0003] 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 oxy...

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Problems solved by technology

However, the test shows that the distribution of the reaction gas in this type of flow field flow channel is not very uniform, and the distribution of the flow rate varies with the position of the gas inlet and outlet, and the size of the flow channel.

[0009] The advantage of the serpentine flow field is that the gas flow distribution is uniform, but the length of the gas passing through is longer, the flow resistance is larger, and the energy consumption required to drive the gas flow is larger

If the flow channel is too long, the gas concentration in the downstream direction of the flow channel may not be sufficient, resulting in increased concentration polarization

At the same time, the design flexibility of the serpentine flow field is relatively small.

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