Electrolyte membrane-electrode structure with resin frame for fuel cells

Abstract

The present invention provides an electrolyte with a resin frame for a fuel cell capable of firmly and favorably bonding an electrolyte membrane-electrode structure and a resin frame member with a simple structure, and capable of suppressing generation of air bubbles inside the adhesive as much as possible Membrane-electrode structures. In the electrolyte membrane-electrode structure (10) with a resin frame, the electrolyte membrane-electrode structure (10a) is integrated with a resin frame member (24). The resin frame member (24) has an inner bulging portion (24a) bulging from an inner peripheral base end portion (24s) toward the cathode electrode (22) side. A flat surface (26b) is provided on the inner bulge (24a), and an adhesive layer (28) is formed between the flat surface (26b) and the outer peripheral surface (18be) of the solid polymer electrolyte membrane (18). . The flat surface (26b) constitutes a tapered surface inclined from the front end (24ae) of the inner bulge (24a) toward the inner peripheral proximal end (24s).

Description

technical field [0001] The present invention relates to an electrolyte membrane-electrode structure with a resin frame for a fuel cell, which includes a so-called stepped MEA in which a solid polymer electrolyte membrane is sandwiched between a first electrode and a second electrode, and is provided around the outer periphery of the stepped MEA. resin frame member. Background technique [0002] In general, a solid polymer fuel cell employs a solid polymer electrolyte membrane composed of a polymer ion exchange membrane. The fuel cell includes an electrolyte membrane-electrode structure (MEA) in which an anode electrode is disposed on one side of a solid polymer electrolyte membrane, and a cathode electrode is disposed on the other side of the solid polymer electrolyte membrane. The anode electrode and the cathode electrode each have a catalyst layer (electrode catalyst layer) and a gas diffusion layer (porous carbon). [0003] A fuel cell is constituted by sandwiching an e...

AI Technical Summary

Problems solved by technology

[0012] However, in the bonding process between the stepped MEA 4 and the packing sheet structure 5, when the adhesive is excessively applied to the bonding portion 6 or the bonding load is uneven, the adhesive may flow from the bonding portion 6 6 exposed

[0013] In addition, as for the bonding part 6, a closed space is often formed, and when the adhesive is spread in the bonding part 6, air may not be able to escape from the bonding part 6.

As a result, the adhesive cannot be applied to a uniform thickness due to air remaining in the bonding portion 6, resulting in large variations in quality such as gas barrier properties and bonding durability.

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