Fuel cell metal bipolar plate regional runner

Abstract

The invention discloses a fuel cell metal bipolar plate regional runner, which belongs to the technical field of fuel cells. According to the metal bipolar plate regional runner new structure, each hydrogen runner comprises a hydrogen runner gas inlet area, a hydrogen runner descending area, a hydrogen runner lowest area and a hydrogen runner gas outlet area, wherein the gas inlet area at least comprises two gas inlet steps, the descending area at least comprises one step, and each of the lowest area and the gas outlet area comprises one step. Each oxygen runner comprises an oxygen runner gasinlet area, an oxygen runner highest area, an oxygen runner descending area and an oxygen runner gas outlet area; the adjacent steps of the oxygen and hydrogen runners are connected end to end througha slope surface; the depth of the hydrogen runner is gradually reduced as a whole, and is increased after reaching the lowest area; the depth of the oxygen runner is gradually increased as a whole, and is reduced after reaching the highest area. Thus, the problems of low gas flow rate and insufficient pressure in the metal bipolar plate runner can be solved, the sufficiency and drainage of electrochemical reaction can be improved and the service life of the polar plate can be prolonged.

Description

technical field [0001] The invention relates to a fuel cell metal bipolar plate subregion flow channel, which belongs to the technical field of fuel cells. Background technique [0002] A metal bipolar plate fuel cell is a device that converts chemical energy into electrical energy. The main reactants are hydrogen and oxygen, and the product is only water. It is an environmentally friendly device. The metal bipolar plate is an important part of the fuel cell and is the "skeleton" in the stack, and its weight accounts for more than 80% of the weight of the fuel cell stack; the fuel cell has a high requirement for the purity of hydrogen, which needs to reach more than 99.99% The content of impurities such as sulfur, carbon and ammonia has a serious impact on the service life of proton exchange membranes and catalysts; the existing flow channel configuration of metal bipolar plates is likely to cause slow flow of reaction gas in the flow channel and insufficient pressure, resul...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of insufficient electrochemical reaction in the flow channel due to slow gas flow rate and insufficient pressure under the condition that the inlet pressure is determined, and at the same time solve the problem that the low flow rate of the reactant causes impurities in the reactant to be deposited on the metal bipolar plate. The problem of reduced life caused by surface deposition; in order to overcome the above defects in the existing technology, a new hydrogen flow channel and oxygen flow channel configuration in the sub-area of ​​the metal bipolar plate of the fuel cell is proposed

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