Fuel cell sealing material and preparation method thereof

Abstract

The invention discloses a fuel cell sealing material. The fuel cell sealing material comprises a release film layer and an adhesive glue layer, a substrate film and an elastic sealant layer, wherein the adhesive glue layer, the substrate film and the elastic sealant layer are arranged outwards in sequence on two sides of the release film layer. Through the fuel cell sealing material, inner sealing of membrane electrodes in fuel cell and external sealing between the membrane electrodes and bipolar plates are solved simultaneously; the raw material is saved; the fuel cell sealing material is good in adhesive performance under room temperature; the hot sealing is not required, so that the sealing processing time of the membrane electrodes is shortened; the production efficiency is improved; the inner sealing material and the external sealing material are integrated, so that the automatic production of electric piles of the fuel cells is facilitated; and the fuel cell sealing material is of great significance to the industrialization of the fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell sealing material and a preparation method thereof. Background technique [0002] Fuel cells are more and more accepted by people from all walks of life due to their high conversion efficiency, low noise, and no emissions. Under the action of the catalyst on the anode plate of the fuel cell, hydrogen generates protons and electrons. The protons pass through the proton exchange membrane and reach the cathode of the fuel cell, while the electrons cannot pass through the proton exchange membrane and can only reach the cathode of the fuel cell through an external circuit. plate, thereby generating current in the external circuit. After the electrons reach the cathode, they recombine with oxygen atoms and protons to form water. Due to the small diameter of hydrogen molecules, it is very difficult to seal the fuel cell. Most of the current fuel cell sealing...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the above-mentioned sealing method are: since the fuel cell stack is assembled by a plurality of membrane electrodes and bipolar plates, and the front and rear end plates of the fuel cell stack must bear a large uniform fastening force, the sealing The parts have a certain elastic deformation, and are tightly attached to the membrane electrode and bipolar plate to achieve the sealing effect

It realizes that when the diversion bipolar plate is separated from the membrane electrode, the seal is not easy to deform and will not fall off, but it needs to process the surface of the membrane electrode, which is costly and complicated to operate

[0005] Patent 200480023765 "Sealing of Membrane Electrode Assembly" discloses a packaging film including a lining layer and an adhesive layer. In order to realize the sealing of the membrane electrode, two packaging films need to be prepared at the same time, and one is arranged on the outside of the gas diffusion substrate. On the surface, another packaging film is set on the inner surface of the gas diffusion substrate. At the same time, in order to achieve a better sealing effect, it is necessary to pre-set one or more gaskets on the MEA. The operation process is complicated, which increases the sealing of the MEA. Processing time, not conducive to automated production

And the sealing effect is not as good as expected

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