Bipolar plate, fuel cell stack comprising same, and power generation system

Abstract

The invention discloses a bipolar plate, a fuel cell stack comprising the same, and a power generation system. The bipolar plate includes a first polar plate and a second polar plate, wherein the first polar plate has a first face and a second face, and the second polar plate has a third face and a fourth face. The first face of the first polar plate has a first flow channel and a first referenceface, and the third surface of the second polar plate is provided with a third runner and a third reference surface. In the bipolar plate, the second surface of the first polar plate is attached to the fourth surface of the second polar plate, and the first surface of the first polar plate and the third surface of the second polar plate have different flow fields. The bipolar plate also comprisesat least two synchronous fluctuating areas which are channels for leading a cooling agent in and out of a bipolar plate interlayer. A cooling agent guide dike is arranged on the second polar plate andcan guide the cooling agent to flow according to a set route. Due to the characteristics, the bipolar plate has the advantages of good drainage performance, good cooling effect and the like.

Description

Technical field [0001] The invention belongs to the technical field of fuel cells, and particularly relates to a bipolar plate used in a fuel cell stack, and a fuel cell stack and a power generation system containing the bipolar plate. Background technique [0002] Fuel cell is an electrochemical reaction device that can convert chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, zero emission, and no mechanical noise. It is favored in military and civilian fields. Proton exchange membrane fuel cells (PEMFC) use solid polymer membranes as electrolytes, which have the advantages of simple structure and low operating temperature, and have unique advantages as a mobile power source. Internationally renowned automobile companies such as Toyota Motor Corporation of Japan and Hyundai Motor Corporation of South Korea have developed mass-produced fuel cell electric vehicles (FCEV or FCV) powered by PEMFC. [0003] Each PEMFC cell consists of...

AI Technical Summary

Problems solved by technology

The straight-through flow channel has a simple structure and low flow resistance, but the power generated by the fuel cell stack is sensitive to fluctuations in gas pressure

The pressure drop of multiple parallel serpentine flow channels is large, which facilitates the diffusion of gas to the gas diffusion layer and the electrode catalyst. However, if the serpentine flow channels are used on the cathode side of the PEMFC, it is not conducive to the discharge of the reaction product water.

In the prior art, the fuel flow channel on the anode plate and the oxidant flow channel on the cathode plate often adopt the same pattern, either as a serpentine flow channel or as a straight-through flow channel. It is difficult to adjust the pressure drop and the pressure drop of air (or oxygen) to the optimum value at the same time, because the fluidity of hydrogen is better than that of air and oxygen. When the pressure drop of hydrogen reaches the optimum value on the anode side of the PEMFC, The pressure drop of air or oxygen on the cathode side of the PEMFC will inevitably be too large, which will lead to increased parasitic power and poor drainage

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