Membrane electrode integrated component with sealed frames and preparation method thereof

Abstract

The invention relates to a membrane electrode integrated component with sealed frames and a preparation method thereof. The membrane electrode integrated component comprises an electrolyte film, electrodes which are arranged at the two sides of the electrolyte film and respectively comprise a catalytic layer and a diffusion layer, and the elastomer sealed frames arranged around the electrodes at the two sides of the electrolyte film; wherein the elastomer sealed frames are higher than the diffusion layers (3) by 0.1-2.0mm; the two ends of the sealed frame are designed with convex sealing linesused for sealing the sealed frame and a bipolar plate; the sizes of the catalytic layers and the diffusion layers at the two sides of the electrolyte film meet the requirement of D2<= D1<=D2+D3, wherein the D1 is the length, by which every side of the electrolyte film is longer than the catalytic layer and the diffusion layer; the D2 is the sum of the thicknesses of the catalytic layer and the diffusion layer; and the D3 is the thickness, by which the elastomer sealed frames are higher than the catalytic layers and the diffusion layers at the two sides of the electrolyte film. The invention has the characteristics that the insulation property and the gas barrier property of the cell can be ensured, the membrane electrode integrated component is easy for batch production and is beneficialto simplifying the assembly and the disassembly of a battery pack, and the production efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a sealing structure between an electrolyte membrane and an electrode and between an electrode and a pole plate. Background technique [0002] In order to compete with existing power and energy technologies, fuel cell technology must improve reliability and reduce costs to reach and approach the level of existing power and energy technologies. Therefore, optimizing the structure of fuel cells and realizing mass production are key steps to realize the large-scale application of fuel cell technology. [0003] In a fuel cell, the proton exchange membrane and the cathode and anode on both sides constitute a membrane electrode assembly (MEA). It can be used as a single cell to generate electricity externally, or multiple MEAs can be assembled into a battery pack by connecting bipolar plates in series. Therefore, a fuel cell (group) is usually assembled by a pole plate a...

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Problems solved by technology

For example, in the structure and process involved in US2002 / 0034670, only the rubber body is used to seal the membrane and the electrode catalytic layer, and the sealing of the gas diffusion layer also depends on the assembly force between the electrode plate and the sealing edge, which is easy to form the fuel and oxidant. External leakage; the sealing structure involved in US6,057,054 and US7,070,876 combines the membrane and the electrode as a whole and seals it with a rubber body, and designs a variety of sealing edge structures, which can improve the sealing performance of the battery, but due to its membrane and electrode The same cutting size will easily cause a short circuit between the two electrodes or reduce the insulation inside the battery, resulting in a decrease in battery efficiency or yield.

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