Novel membrane electrode structure of proton exchange membrane fuel cell and packaging method thereof

Abstract

The invention discloses a novel membrane electrode structure of a proton exchange membrane fuel cell. The structure comprises a proton exchange membrane, a catalyst layer, a gas diffusion layer and apackaging frame, at least one layer of protective frame is arranged between the gas diffusion layer and the catalyst layer, and the protective frame and the packaging frame are both provided with through notches with the same sizes and positions; the invention also discloses a packaging process of the membrane electrode. The process comprises the following steps: pre-setting a glue brushing blankarea on the protective frame and the packaging frame, pre-pressing the protective frame on the proton exchange membrane, and spraying a catalyst; the proton exchange membrane is subjected to hot pressing in advance by adopting the protective frame, and then the catalyst layer is coated, so that the mechanical strength performance and the positioning effect of the proton exchange membrane can be enhanced, and the problem that the proton exchange membrane is not easy to position due to swelling when the catalyst layer is sprayed is effectively solved; and the proton exchange membrane is prevented from being crushed and damaged by the edge end of the gas diffusion layer during hot pressing, and the glue overflow phenomenon of the membrane electrode during hot pressing can be effectively solved through the blank area brushed with the glue.

Description

technical field [0001] The invention relates to the field of membrane electrode packaging, in particular to a novel membrane electrode structure and packaging method for a proton exchange membrane fuel cell. Background technique [0002] Fuel cell is a power generation device that directly converts chemical energy into electrical energy through electrochemical reaction. It has the characteristics of high energy conversion efficiency and environmental friendliness. It is considered to be the preferred clean and efficient power generation technology in the 21st century. The membrane electrode is where the electrochemical reaction takes place, where the chemical energy in the fuel is directly converted into electrical energy. The membrane electrode is the core component of the proton exchange membrane fuel cell, and the performance of the membrane electrode directly determines the service life of the battery. The membrane electrode is usually composed of a cathode gas diffusio...

AI Technical Summary

Problems solved by technology

However, in the positioning process, the gas diffusion layer needs to be glued to the catalytic electrode with a high-temperature resistant tape. The process of the tape requires high precision, so the operation requirements for laborers are high, the labor pressure is high, and the efficiency is low.

[0005] Patent 201210490779.0 designed the hot-pressing fixture to position the proton exchange membrane and edge-sealing material through positioning holes, but it does not involve how to package the diffusion layer on the surface of the catalytic electrode. Once the gas diffusion layer is larger than the catalyst layer area of ​​the catalytic electrode, it will At this time, due to a certain gradient difference between the diffusion layer and the catalytic electrode, the proton exchange membrane is easily pressed around the gas diffusion layer under high pressure conditions, and membrane leakage occurs, and the packaging effect is not obvious.

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