Composite bipolar plate for fuel cell and preparation method and application thereof

Abstract

The invention relates to the field of the fuel cell, and discloses a preparation method of a carbon / polymer composite bipolar plate. The bipolar plate is composed of polystyrene resin, hydrogenated ethylene-butylene-styrene triblock copolymer, conductive filler and fiber reinforced material. The composite bipolar plate is low in air permeability, good in machining, and excellent in conductivity and corrosion resistance. The composite plate provided by the invention can be applied to a proton exchange membrane fuel cell, alkaline anion-exchange membrane fuel cell and methanol fuel cell.

Description

technical field

[0001] The invention belongs to the field of fuel cells, and in particular relates to a composite bipolar plate used for fuel cells and its preparation method and application. technical background

[0002] A fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. It has many advantages such as high energy conversion efficiency, high energy density, and environmental friendliness. The bipolar plate is a key component of the fuel cell and was widely used at first. The bipolar plate is a non-porous graphite plate, which has good electrical conductivity and corrosion resistance, but has the disadvantages of low strength and high porosity. In actual use, the thickness of 3-5mm must be guaranteed to ensure its mechanical strength. , which is not conducive to the improvement of the mass specific power of the stack. In addition, the machining cost of graphitization process and flow field is high, which is not conducive...

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