A 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, comprising a bipolar plate body, a fractal flow field is arranged on the bipolar plate body, and the fractal flow field includes a reaction gas inlet and a gas flow An inlet transition area is provided between the gas flow channel and the reaction gas inlet, the reaction gas inlet is arranged at the outer end of the inlet transition area, and the gas flow channel includes a first flow channel and a second flow channel , taking the central point of the fractal flow field as the center of symmetry, the first flow channel and the second flow channel are arranged symmetrically, the bipolar plate can enhance the mass transmission of gas and water, and improve the management ability of water, gas and heat. The method for preparing this type of bipolar plate with high-performance and complex bionic structure flow field is prepared by composite preparation of laser melting technology and laser polishing technology, and can prepare flow channels of arbitrary complex shapes. The process is simple and the reliability is high. At the same time, the laser Polishing technology improves the surface finish of the flow field flow channel, thereby improving fluidity.

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.

Images