Waterwheel-shaped fuel cell flow-field plate applicable to gas electrode

Abstract

The invention relates to a waterwheel-shaped fuel cell flow-field plate applicable to a gas electrode. The waterwheel-shaped fuel cell flow-field plate comprises a substrate (2), runners, an air inlet(7) and an air outlet (8), wherein the runners are fan-shaped runners (5), the air inlet (7) is arranged in the center of a flow field, one end of each fan-shaped runner (5) communicates with the airinlet (7) arranged in the center, the other end of the fan-shaped runner (5) communicates with a product collection runner (4), an air inlet hidden passage is arranged at a corner of a side surface of the flow field plate, reaction gas enters the air inlet hidden passage, is introduced to the right center of the flow field from the air inlet (7) and then is uniformly diffused towards the surrounding fan-shaped runner (5), a product of each fan-shaped runner is directly discharged out of the air outlet (8) from a product gathering runner at a relatively short path. Compared with the prior art,the waterwheel-shaped fuel cell flow-field plate has the advantages of relatively short flow of the reaction gas in the flow field and relatively small voltage drop, the energy consumption is reduced, water in the product is relatively easy to discharge, meanwhile, the flow field is simple in structure and is convenient to process, and mass production is easy.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a waterwheel-shaped fuel cell flow field plate suitable for gas electrodes. Background technique [0002] Fuel cells are considered to be the most potential high-efficiency energy conversion devices due to their advantages of environmental protection and pollution-free, low-temperature start-up, low noise, and high energy conversion rate. The flow field plates in them have an important impact on the performance of fuel cells. For gas electrodes in fuel cells, the flow field plates are used to transport reactant gases, collect current, and provide channels for product discharge. Improving the structure and layout of the flow channels in the flow field plate has become the key to improving the efficiency of fuel cells and accelerating the development and application of fuel cells. [0003] The flow channels in the flow field plate can guide the distribution of the reactant gas ...

AI Technical Summary

Problems solved by technology

Patent US5108849 discloses a serpentine flow field plate, the serpentine flow channel is longer, the pressure difference between the inlet and outlet of the flow channel is large, and the loss of the air pump is large, which makes the concentration distribution of the reaction gas along the length of the flow channel uneven, resulting in The electrochemical reaction on the surface of the electrode is not uniform and the performance of the fuel cell is reduced; the gas flow rate of the parallel flow field plate disclosed in the patent CN203760566U is low, which is not conducive to the discharge of water in the porous electrode, and it is easy to cause water plugging; the disclosed in the patent CN101431156 and US005300370A The interdigitated flow field plate has high requirements on the inlet pressure of the gas, and further research is needed on the uniformity of gas distribution and pressure drop control; although the porous flow field disclosed in the patent CN203607488U has a simple structure, the flow rate of the reaction gas is low , is not conducive to the discharge of liquid water, and is easy to short-circuit; the spiral flow field structure disclosed in the patent CN103346337A is relatively complex, and the flow channel is long, which will cause uneven distribution of reaction gas concentration, large pressure drop, and unstable battery performance

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