Proton exchange membrane fuel cell membrane electrode sealing frame

Abstract

The invention discloses a proton exchange membrane fuel cell membrane electrode sealing frame. A membrane electrode comprises a proton exchange membrane, the sealing frame comprises a leveling layer, protection layers, a gas diffusion layer and a sealing layer, the extension of the proton exchange membrane is butted with the leveling layer, the proton exchange membrane extends along the gas diffusion layer, the protection layers are arranged at arranged at two sides of the extension of the proton exchange membrane, and the gas diffusion layer is arranged outside the protection layers. The proton exchange membrane fuel cell membrane electrode sealing frame has the advantages of excellent sealing effect, saving of the use amount of the proton exchange membrane and the gas diffusion layer, cost reduction, reasonable structure design, facilitation of flow processing, convenience for industrialization, good proton exchange membrane protection effect, and effective prevention of machines from being damaged.

Description

technical field [0001] The invention relates to a membrane electrode sealing frame of a proton exchange membrane fuel cell. Background technique [0002] The proton exchange membrane fuel cell is an electrochemical cell, hydrogen enters from the anode and is oxidized, and oxygen is consumed by the cathode. Protons are released during hydrogen oxidation, and the protons are conducted to the cathode through the proton exchange membrane. The proton exchange membrane does not conduct electrons, so the electrons generated by the oxidation of hydrogen are transferred to the cathode through an external circuit to generate current. [0003] In addition to the general characteristics of fuel cells such as high energy conversion efficiency and environmental friendliness, proton exchange membrane fuel cells also have the advantages of rapid startup at room temperature, small size, no electrolyte loss, easy water discharge, long life, specific power and Outstanding features such as hi...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the proton exchange membrane is a very expensive material, and it is not fully utilized after being extended in large quantities, resulting in serious waste

The defect of this method is that it is very difficult to arrange the sealing layer on the gas diffusion layer. At the same time, because the sealing layer is embedded in the gas diffusion layer and pressed against the proton exchange membrane, the proton exchange membrane will fail, and the gas diffusion layer will be compressed. The process also causes shear damage to the proton membrane

The disadvantage of this method is that: the end of the sealing layer and the gas diffusion layer are connected and infiltrated, which will affect the gas diffusion at the edge of the active area and reduce the use efficiency of the catalyst. At the same time, the operation is difficult because the sealing layer must be liquid or colloidal.

The properties of the sealing layer material and the gas diffusion layer are quite different, and the connection may be damaged due to the difference in expansion coefficient after the two are infiltrated and handed over

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