Cathode plate, bipolar plate, fuel cell stack, power assembly and transportation tool

Abstract

The invention provides a cathode plate, a bipolar plate, a fuel cell stack, a power assembly and a transportation tool. The cathode plate is curved and is provided with a cathode gas flow field. The cathode gas flow field comprises a plurality of cathode gas sub-channels which are located on the circumference wall of the cathode plate. Each cathode gas sub-channel includes a first gas inlet and afirst gas outlet. The multiple first gas inlets are arranged along the axis of the cathode plate, and the multiple first gas outlets are arranged along the axis of the cathode plate. The cathode plateis provided with a first cooling water channel on the side opposite to the cathode gas flow field. The cathode plate of the fuel cell of the invention can increase the mass transfer ability of the reaction gas without significantly increasing the flow resistance.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cathode plate and a bipolar plate of a fuel cell, a fuel cell stack, a power assembly and a vehicle. Background technique [0002] A fuel cell is an energy converter that directly converts the chemical energy of "fuel gas" into direct current electrical energy. Under the current severe energy and environmental situation, hydrogen energy, as a high-quality, efficient and clean energy material, has gradually attracted people's attention. At the same time, fuel cells, as one of the important forms of hydrogen energy utilization, have also attracted the pouring of many scientific research and industrial forces. In the case of a hydrogen-oxygen fuel cell, the products are water and heat. The core components contained inside the fuel cell include membrane electrodes and plates. During the working process, the membrane electrode should maintain a certain water content, so that t...

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Problems solved by technology

In the existing fuel cell configuration, the mass transfer capacity of the reaction gas is generally poor in the channel with better flow rate, which easily causes concentration polarization on the electrode; and by increasing the geometric complexity of the reaction gas channel (such as increasing The method of increasing the mass transfer capacity of the turbulence structure) significantly increases the flow resistance, often resulting in a large flow pressure drop, which is very likely to outweigh the gain, resulting in a decrease in the net output power of the fuel cell

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