A kind of bipolar plate, fuel cell unit, fuel cell and manufacturing method thereof

Abstract

The invention relates to a bipolar plate, a fuel cell unit, a fuel cell and a manufacturing method thereof, and relates to the technical field of fuel cells. The main technical scheme adopted is: a bipolar plate includes an anode plate and a cathode plate; wherein, the flow channels at the power generation area of ​​the anode plate are set as interdigitated flow channels; the flow channels at the power generation area of ​​the cathode plate are set to be parallel runner. The anode plate includes an anode plate body and a fuel distribution cover, and the cathode plate includes a cathode plate body and an oxidant distribution cover. A fuel cell unit includes a membrane electrode and a bipolar plate as described above. A fuel cell includes a plurality of the above-described fuel cell units. The present invention is mainly used for improving the fuel diffusion ability of the fuel cell to the catalytic layer, avoiding the flooding phenomenon of the cathode of the fuel cell, and realizing the uniform circulation of the cooling liquid side and the gas side fluid while enhancing the mass transfer.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a bipolar plate, a fuel cell unit, a fuel cell and a manufacturing method thereof. Background technique [0002] The proton exchange membrane fuel cell is a new type of energy conversion device, which is used to convert the chemical energy in the fuel into electrical energy output. Proton exchange membrane fuel cells have the advantages of high energy conversion efficiency, not limited by the Carnot cycle, high operational reliability, low operating temperature, fast start-up, simple structure, and no noise. They can be widely used in the transportation industry, mobile facility power supply, Distributed power generation and other fields. The proton exchange membrane fuel cell unit is composed of bipolar plates, membrane electrodes and seals, etc., and multiple battery units can be assembled in series to form a stack structure. [0003] The power generation performance and r...

AI Technical Summary

Problems solved by technology

However, the current anode bipolar plates are mainly designed with parallel flow channels or parallel serpentine flow channels. The flow structure of this design leads to convection as the main transmission mode, and the diffusion and transmission ability of fuel to the catalytic layer is weak. The fuel in the catalytic layer low concentration

Due to the discontinuous characteristics of the flow channel, the interdigitated flow channel has better diffusion and transmission capacity than the parallel and serpentine flow channels; It is conducive to the discharge of the water generated by the cathode, which may easily cause the cathode to be flooded, affect the gas transmission of the cathode, and then affect the power generation performance of the battery; moreover, the design of the existing interdigitated bipolar plate is single, ignoring the influence of the distribution area on the uniformity of the flow field In addition, the cooling liquid side of the traditional interdigitated bipolar plate mostly adopts welding and sealing technology, which limits the development of fuel cell unit integration

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