Metal separator for fuel cell, and fuel cell stack provided with same

Abstract

The present invention relates to a metal separator for a fuel cell, and a fuel cell stack provided with the same, wherein the metal separator for a fuel cell comprises: a channel portion comprising reaction gas channels which are formed at the center and are protruded from a first surface to a second surface, and a cooling water channel which is formed between reaction channels protruded at the second surface; a metal main body portion which is integrated with the channel portion at the four side edges of the channel portion and has openings which penetrate the first surface and the second surface and are formed at the two side surfaces facing each other; a polymer manifold-gasket assembly comprising a manifold portion which is formed as a divided space at the openings for the supply and discharge of a reaction gas and cooling water, and a gasket which is integrated with the manifold portion at the edge of the metal main body portion and a region required for sealing; and reaction gas inflow / outflow holes which are integrated with the manifold-gasket assembly. By the configuration, the present invention enables a smoother flow of the reaction gas and cooling water flowing through the reaction gas channels and the cooling channel, obtains stiffness of a metal separator, and improves the durability of a metal separator.

Description

technical field [0001] The invention relates to a metal separation plate for a fuel cell and a fuel cell stack with the metal separation plate. In more detail, it relates to a technique for maintaining airtightness using a manifold-gasket assembly including a reaction gas channel and a cooling water channel, and a polymer manifold part integrally formed with the gasket. Background technique [0002] Generally, a fuel cell refers to a power generation device that converts chemical energy into electrical energy by utilizing the oxidation and reduction reactions of hydrogen and oxygen. At the negative electrode, hydrogen gas is oxidized and separated into hydrogen ions and electrons, and the hydrogen ions move to the positive electrode through the electrolyte. At this point, electrons move through the circuit to the positive pole. A reduction reaction in which hydrogen ions, electrons, and oxygen react to form water occurs at the positive electrode. [0003] First, looking a...

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Problems solved by technology

However, the support by means of spacers cannot completely eliminate the compression deformation caused by the load of the fuel cell stack, and when the additional spacers are detached and cross-cut the inflow part of the reaction gas, the resistance of the inflow of the reaction gas will increase even more. The problem

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