Bipolar plate runner with injection function, bipolar plate and fuel cell

Abstract

The invention discloses a bipolar plate runner with an injection function, and the bipolar plate runner is formed by repeatedly arranging a plurality of basic units horizontally and longitudinally, wherein each basic unit comprises four runner ridges, and runners allowing gas to pass through are formed between the first runner ridge and the second runner ridge and between the third runner ridge and the fourth runner ridge; the first ends of the four flow channel ridges point to the center of the basic unit, so that the flow channel between the first flow channel ridge and the second flow channel ridge is gradually narrowed, and the flow channel between the third flow channel ridge and the fourth flow channel ridge is gradually widened. According to the flow channel structure provided by the invention, the liquid water discharge effect can be enhanced; the structure is simple, processing is easy and cost is low; active drainage and static drainage are compatible, and the drainage effect is good.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a bipolar plate flow channel with ejection function, a bipolar plate and a fuel cell. Background technique [0002] The fuel cell is composed of membrane electrodes and bipolar plates alternately stacked, and at both ends is composed of front and rear conductive plates and end plates. The conduction in the electrode and the conduction of electrons in the external circuit are completed, and the power generation process has the advantages of quietness and high efficiency. [0003] The electrochemical reaction process of the low-temperature fuel cell will generate liquid water. If the liquid water accumulates in the catalytic layer, diffusion layer and flow channel of the fuel cell membrane electrode, the concentration of the reactants will be reduced, and even the catalyst will be flooded, which will reduce the power generation efficiency of the fuel cell. , worsen the fuel cell reaction...

AI Technical Summary

Problems solved by technology

[0004]The current bipolar plate flow channel structure often forms liquid water accumulation at the corners of the flow channel, under the ridge and in the dead zone of flow, resulting in the degradation of fuel cell performance

Some flow channel designs to enhance the drainage effect often adopt structures such as 3D flow channels and interdigitated flow channels, which will bring problems such as difficult processing and large gas flow resistance.

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