Fuel cell, fuel cell bipolar plate and flow field structure of fuel cell bipolar plate

Abstract

The invention relates to a fuel cell, a fuel cell bipolar plate and a flow field structure of the fuel cell bipolar plate, the flow field structure of the fuel cell bipolar plate comprises a gas inlet, a channel and a gas outlet which are sequentially communicated, and the gas inlet and the gas outlet are respectively provided with an end flow channel; the channel comprises a middle section and two distribution sections arranged at the two ends of the middle section respectively, the middle section comprises a plurality of middle flow channels which are of a wavy structure and are arranged in parallel, each distribution section comprises a plurality of distribution flow channels, and the distribution flow channels are correspondingly communicated between the end flow channels and the middle flow channels; and an included angle between the distribution flow channel and the middle flow channel which are communicated with each other is an obtuse angle. The flow field structure can be simplified, the gas flow speed can be increased, the resistance drop can be reduced, and the drainage performance can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell, a fuel cell bipolar plate and a flow field structure of the fuel cell bipolar plate. Background technique [0002] The design of the flow field structure is an effective way to improve the performance of the fuel cell. A good flow field structure design can achieve a better transfer efficiency of the gas fuel inside the cell, and at the same time improve the discharge effect of the reaction product liquid water and extend the mass transfer limit. Afterwards, thus improving battery performance. [0003] At present, the flow channel structures of fuel cell bipolar plates mainly include serpentine flow channels, straight channel flow channels, and mesh flow channels, among which the serpentine flow channel is the most researched flow channel form, which can quickly eliminate Liquid water, but for a bipolar plate with a large area, there is a phenomenon of excessive ...

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Problems solved by technology

[0003] At present, the flow channel structures of fuel cell bipolar plates mainly include serpentine flow channels, straight channel flow channels and mesh flow channels. Liquid water, but for a bipolar plate with a large area, there is a phenomenon of excessive pressure drop and uneven gas distribution due to too long flow channel; the straight channel flow channel can reduce the gas pressure drop and improve the circulation efficiency, but the reaction gas is in the Excessive flow velocity in the straight flow channel will lead to low reaction efficiency; the design of the mesh flow field is flexible and the structure is simple, but the gas flow velocity in the flow field is low, the resistance drop is large, and the drainage capacity is also poor

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