Fuel cell bipolar plate with bionic self-draining function and self-draining method

Abstract

The invention discloses a fuel cell bipolar plate with a bionic self-draining function and a self-draining method. Primary ridges are formed on a bipolar plate main body; micro flow fields are arranged among the various primary ridges; the micro flow fields comprise partially cone frustum-shaped bases; secondary ridges, third-level ridges and micro flow channels are arranged on the bases; the third-level ridges and the micro flow channels form bottom channels; the micro flow fields comprises self-draining mechanisms; when water produced by an electrochemical reaction gathers on the bottom channel of the micro flow channels, a liquid water film layer is formed on the bottom channel, and water produced by the reaction is discharged from the bottom channel; when more water gathers on the bottom channel, the water gathers on the liquid water film, solid-liquid contact is avoided, and the water is discharged out of the micro flow fields in a sliding manner; and due to the self-draining mechanisms, the retention phenomenon of liquid water among the flow channels is reduced, and the draining efficiency is improved, so that distribution of reactive gases among the various flow channels isuniform, the gas mass transfer efficiency is further improved, and the performance and stability of the fuel cell are improved.

Description

technical field [0001] The invention relates to fuel cell technology, in particular to a fuel cell bipolar plate with bionic self-drainage function and a self-drainage method thereof. Background technique [0002] The proton exchange membrane fuel cell is a power generation device that directly converts the chemical energy stored in the fuel and oxidant into electrical energy through an electrochemical reaction. It does not go through the heat engine process, so it is not limited by the Carnot cycle, and the energy conversion efficiency is high. Since there is no combustion process in any form during work, there will be no harmful gases such as nitrogen and sulfur oxides. The products are only electric energy, water, and heat energy. It is environmentally friendly and is an environmentally friendly and green power generation device. In addition, it also has With the characteristics of quick start, low temperature operation, and no noise, it is considered to be the first choi...

AI Technical Summary

Problems solved by technology

At present, the parallel flow field can be used as its drainage device. However, due to the short residence time of the reaction gas in the straight channel and the relatively low flow rate in the parallel flow field, most of the generated water forms a liquid column in the flow channel, blocking the flow channel, and greatly affecting the battery. performance

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