Bipolar plate with high-performance complex bionic structure flow field and preparation method

Abstract

The invention relates to a bipolar plate with a high-performance complex bionic structure flow field. The bipolar plate comprises a bipolar plate body; a fractal flow field is arranged on the bipolarplate body; the fractal flow field comprises a reaction gas inlet and a gas flow channel; an inlet transition area is arranged between the gas flow channel and the reaction gas inlet; the reaction gasinlet is arranged at the outer end of the inlet transition area; the gas flow channel comprises a first flow channel and a second flow channel; the first flow channel and the second flow channel aresymmetrically arranged by taking the central point of the fractal flow field as a symmetric center. The bipolar plate has the capabilities of enhancing the mass transfer of gas and water and improvingthe management of water, gas and heat. According to the method for preparing the bipolar plate with the high-performance complex bionic structure flow field, the flow channel in any complex shape canbe prepared through the composite preparation of a laser melting technology and a laser polishing technology; the process of the method is simple, and the reliability of the method is high; and the surface smoothness of the flow field flow channel is improved through the laser polishing technology, and therefore, fluidity is improved.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell bipolar plate, in particular to a bipolar plate with a high-performance complex bionic structure flow field and a preparation method. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) has considerable market application prospects because of its high energy conversion rate, no pollution, fast start-up and other advantages. Compared with a heat engine, the chemical energy of a fuel cell is directly converted into electrical energy without the need for an initial conversion into heat. Therefore, the conversion is not limited by the Carnot cycle, and theoretically a high efficiency of 90% conversion can be achieved. [0003] The core of a fuel cell is a membrane electrode and a bipolar plate. Membrane electrodes are places for electrochemical reactions; bipolar plates provide gas distribution and current collection. In order to complete the two tasks of gas distribution ...

AI Technical Summary

Problems solved by technology

The cross-sectional shape of the flow channel formed by the traditional process is single, and the forming cost is high, the process is complicated, the consumables are large, and the environment is not friendly

With the trend of complex bipolar plate flow channel structure, high dimensional accuracy, and high processing quality, traditional processing methods are gradually unable to meet the above requirements

At the same time, low raw material utilization rate, high processing cost, low production efficiency, noise generated by processing, and unfriendly to the environment are the disadvantages of the traditional processing methods mentioned above.

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