Fuel cell metal bipolar plate and fuel cell

Abstract

The invention provides a fuel cell metal bipolar plate and a fuel cell and relates to the technical field of fuel cells. The fuel cell metal bipolar plate comprises a first flow field single plate anda second flow field single plate. A first runner comprises a first trench ridge and a first trench groove. A second runner comprises a second trench ridge and a second trench groove. The height and width of the first trench ridge and the second trench ridge are in a range of 100-1000 microns. The width of the first trench groove and the second trench groove are in a range of 50-1000 microns. Airis fed into an oxidant inlet and flows out of an oxidant outlet along the first runner. Hydrogen is fed into a flue gas inlet and flows out of a flue gas outlet along the second runner. The fuel cellmetal bipolar plate effectively improves mass transfer of gas in a flow field, improves the effective use of the catalyst layer area, improves the surface current density of the fuel cell, improves the volume power density of the fuel cell and solves the problem that the runner grooves of the existing metal bipolar plate limit a heat and electron conduction distance and the runner ridges of the existing metal bipolar plate limit a water and oxygen diffusion distance.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a metal bipolar plate of a fuel cell and a fuel cell. Background technique [0002] A fuel cell is a device that generates electricity by electrochemically oxidizing hydrogen and oxygen. With the urgent need for clean energy, it has gained widespread attention. Fuel cells are classified into alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, high temperature solid oxide fuel cells and proton exchange membrane fuel cells. Among them, proton exchange membrane fuel cells are usually formed by alternately stacking membrane electrodes, gas diffusion layers, bipolar plates and other components. [0003] Bipolar plates in the prior art are mainly divided into graphite bipolar plates, composite bipolar plates and metal bipolar plates. Among them, the metal sheet has high strength and good electrical and thermal conductivity, and the raw material is cheap a...

AI Technical Summary

Problems solved by technology

[0004] However, the metal bipolar plates in the prior art have the problem of the limit of the finer flow channel of the bipolar plate. The channel grooves of the metal bipolar plate in the prior art restrict the heat and electron conduction distance, and the channel ridges restrict the The diffusion distance of water and oxygen is limited, which restricts the miniaturization and practical transformation of the fuel cell stack volume

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