Device and method for continuous hydrophobicity of gas diffusion layer of fuel cell

Abstract

The invention discloses equipment for continuous hydrophobicity of a gas diffusion layer and a treatment method, the equipment comprises a conveying roller mechanism, a hydrophobic liquid storage pool, a low-temperature drying oven, a carbon paper cutting mechanism, a carbon paper roasting mechanism and a tail end conveying table, and the conveying roller mechanism sequentially penetrates through the hydrophobic liquid storage pool, the drying oven and the carbon paper cutting mechanism; in the conveying direction of the conveying roller mechanism, the unwinding roller is located at the front station of the hydrophobic liquid storage pool, the winding roller is located at the rear station of the carbon paper cutting mechanism, and a transfer conveying table allowing cut carbon paper to fall down is arranged under a discharging port of the carbon paper cutting mechanism. The carbon paper placed on the transfer conveying table is grabbed by the mechanical arm with the adsorption function in an adsorption mode and then placed in the carbon paper roasting mechanism, and a discharging port of the carbon paper roasting mechanism is communicated with the tail end conveying table. According to the treatment method, two steps of low-temperature treatment and high-temperature roasting treatment are respectively carried out in the hydrophobic treatment process of the carbon paper; continuous hydrophobic treatment of the gas diffusion layer can be achieved for flexible carbon paper, manpower is reduced, and working efficiency is improved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a device and method for continuous hydrophobicity of a gas diffusion layer of a fuel cell. Background technique [0002] The proton exchange membrane fuel cell is a power generation device that directly converts the chemical energy in the fuel and oxidant into electrical energy. , has received the attention of the industry. The membrane electrode is its core component. The membrane electrode is composed of a proton exchange membrane, a catalyst layer and a gas diffusion layer. The gas diffusion layer is an important component of the membrane electrode three-in-one assembly and an important channel for the transmission of reaction gas and generated water. The gas diffusion layer is mainly made of conductive carbon black slurry, which is uniformly coated on the surface of the hydrophobic treated microporous layer, and is made by high temperature sintering and curing. [0003] The microp...

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Problems solved by technology

[0003] The currently used microporous layer is made of flexible carbon paper and non-flexible carbon paper. For flexible carbon paper, the existing gas diffusion layer preparation process is generally carbon paper cutting-hydrophobic treatment-calcining-painting conductive carbon paste - Roasting, etc. In this process, because the carbon paper is cut, it will directly cause the subsequent water-repellent process to not be continuous, thus prolonging the working time and consuming labor costs in the process; in addition, for flexible carbon paper, there are also Those skilled in the art propose to adopt the same method as the preparation method of the fuel cell catalytic layer, that is, to realize the coating of the slurry by roll-to-roll slit coating, but in this process, due to the need for carbon paper after hydrophobic treatment After high-temperature roasting treatment, during the roasting process, due to the gradual brittleness of the carbon paper material, it is obviously unrealistic to wind it on the conveyor roller in the roll-to-roll slit coating equipment

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