DESIGN METHOD OF INTERNAL DIE STRUCTURE AND SLIT COATING DIE APPARATUS FOR UNIFORM COATING OF MEA IN PEMFC

摘要

The present invention relates to an internal design method of a slot coating die for continuous homogeneous coating of an electrode coating catalyst slurry used in an electrode-membrane assembly (MEA) for polymer electrolyte membrane fuel cells (PEMFC). And its device. Therefore, in the present invention, as an internal design method of a slot coating die for continuous uniform coating of an electrode coating catalyst slurry used in an electrode-membrane assembly for a polymer electrolyte membrane fuel cell, flow characteristics within the die of the fluid from the rheological information of the catalyst slurry fluid Selecting a fluid model to analyze the fluid, determining the shape of the chamber inside the catalyst slurry slot coating die of the electrode-membrane assembly in consideration of the rheological properties of the catalyst slurry fluid, and minimizing the shear thinning and uniformity. Deriving the process conditions under which the coating is formed in one thickness is provided. In addition, by the design method for continuous uniform coating of the electrode coating catalyst slurry, one of the chamber and the curved semi-cylindrical chamber for receiving the catalyst slurry from the feed pipe and the feed pipe into which the catalyst slurry flows in and outflowing the catalyst slurry into the slit Provided is a slot coating die apparatus of an electrode-membrane assembly for a polymer electrolyte membrane fuel cell, comprising a slit composed of upper and lower flat plates on a side surface and a die lip which is a catalyst slurry outlet.