Membrane electrode pressing mould and its operation method

Abstract

A membrane electrode pressing mold includes an upper pressing plate, an upper positioning plate, an upper positioning cushion, a lower positioning cushion, a lower positioning plate and a lower pressing plate which are sequentially superimposed. A first electrode and a second electrode, or a first diffusion layer and a second diffusion layer are accurately positioned by positioning holes on the upper and lower positioning cushions, positioning through holes on the upper and lower positioning plates and compressing convex platforms on the upper and lower pressing plates. Compared with the prior art, the membrane electrode pressing mold not only achieve accurate positioning of one electrode and the other electrodes, and a diffusion layer and an electrode, water vapor in a hot pressing process can be discharged smoothly by design of an exhaust flow channels of the upper and lower pressing plates, the problem that a catalyst or carbon powder is splashed throughout under the action of the water vapor can be avoided, and at the same time, the upper and lower positioning cushions make an electrolyte membrane clamped between the upper and lower positioning cushions rapidly-deformed or polluted in the heat and stress conditions.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cell membrane electrode preparation, and specifically relates to a membrane electrode pressing device and an operation method of the pressing device. Background technique [0002] A fuel cell is an electrochemical conversion device that directly converts the chemical energy of fuel into electrical energy. It has the advantages of high energy conversion efficiency, no pollution, no noise, and long service life. It has broad applications in aerospace, transportation, mobile power and other fields. Application prospects. [0003] Membrane electrodes are the core components of fuel cells, where the electrochemical reactions of fuel and oxidant occur. A generalized membrane electrode usually includes an anode diffusion layer, an anode catalyst layer, an electrolyte membrane, a cathode catalyst layer, and a cathode diffusion layer stacked in sequence, but only the vertically overlapping par...

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Problems solved by technology

The device is positioned by positioning guide posts and springs, the position is not accurate enough, and it is easy to move; and the first diffusion layer placed in the upper die head in the device needs to be positioned accurately under vacuum conditions, the structure is complex, and the cost is high; at the same time, the device The die head in the mold is made of stainless steel or titanium plate, which is easy to deform and pollute the electrolyte membrane

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