Metal bipolar plate for fuel cell

Abstract

The invention relates to a metal bipolar plate for a fuel cell. The metal bipolar plate is a hydrogen polar plate and an oxygen polar plate which are formed by stamping of two metal plates with the same thickness. The hydrogen polar plate and the oxygen polar plate are both provided with a common hydrogen channel opening, a common oxygen channel opening, a common cooling fluid opening and a seal groove arranged along two sides and each common fluid opening side. A hydrogenstream-guiding conductive diffusion layer material is placed inside a cavity formed by stamping on the hydrogen polar plate, or a groove-shaped conductive material is arranged, so as to form the hydrogen polar plate. An air flow-guiding conducive diffusion layer material is placed inside a cavity formed by stamping on the oxygen polar plate, or a groove-shaped conductive material is arranged, so as to form the oxygen polar plate. The hydrogenstream-guiding cavity and the air flow-guiding cavity have the same depth with the seal groove. The hydrogen polar plate and the oxygen polar plate are folded back to back through a bracket to form the bipolar plate. The backs of the two plates are abutted against a bracket which has the same shape with the whole seal groove so as to make the bipolar plate form three cavities: an upper cavity for guiding hydrogen, a middle cavity for guiding the cooling fluid and a lower cavity for guiding the air. In comparison with the prior art, the metal bipolar plate has a simple structure, and stamping of various fluid groove shapes is not required.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a metal bipolar plate for a fuel cell. Background technique [0002] A fuel cell is generally constructed of a plurality of cells, each cell comprising two electrodes (anode and cathode) separated by an electrolyte element and assembled in series with each other to form a fuel cell stack. The electrochemical reaction is achieved by supplying the appropriate reactants to each electrode, ie fuel to one electrode and oxidant to the other, creating a potential difference between the electrodes and thereby generating electrical energy. [0003] In order to supply each electrode with reactants, specific interface elements commonly referred to as "bipolar plates" and arranged on both sides of each individual cell are used. These bipolar plates are usually in the form of a single element placed adjacent to the anode or cathode support. Bipolar plates are an important element of a fu...

AI Technical Summary

Problems solved by technology

Among them, the diversion groove on the bipolar plate is stamped and formed by a metal plate. Since the metal bipolar plate is very thin, stamping out various shapes of the diversion fluid channel groove is not only complicated in stamping dies, but also the thickness of the diversion groove is required. It is bound to greatly increase the thickness of the metal double plate

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