Composite material bipolar plate for proton exchange membrane fuel cell and manufacturing method thereof

Abstract

The invention discloses a composite material bipolar plate for a proton exchange membrane fuel cell and a manufacturing method thereof, and belongs to the field of fuel cells. The composite material comprises the following components in part by mass: 60 to 80 parts of conductive filler, 20 to 40 parts of phenolic resin, and 1 to 5 parts of fiber reinforcing agent; the conductive filler is graphite and / or metal; the mass ratio of the graphite to the metal is 1:1-3:1; the manufacturing method comprises the following steps of: preparing 60 to 80 mass percent absolute ethanol solution from a phenolic resin; mixing the absolute ethanol solution, the graphite and the fiber reinforcing agent and preparing a block material; scattering the metal which is presoaked in 1 to 10 mass percent phenolic resin absolute ethanol solution, and coating on the block material uniformly; and then heating and performing pressure forming, wherein volume density is 1.90 to 2.50g / cm<3>; bending strength is 60 to100MPa; and conductivity is 5.0*10<4> to 3.0*10<5>S / m. The raw materials are easily obtained, the manufacturing process is simple, and the bipolar plate is low in cost and is suitable to be industrially produced on a large scale.

Description

technical field [0001] The invention belongs to the field of fuel cells, and relates to a composite material bipolar plate for a proton exchange membrane fuel cell and a manufacturing method thereof. Background technique [0002] Due to the unique outstanding advantages and broad market prospects of proton exchange membrane fuel cells, they have been highly valued by various countries. The bipolar plate is one of the key components of the proton exchange membrane fuel cell. The functions and functions of the bipolar plate are as follows: (1) separate the oxidant and the reductant, (2) collect and deliver the current, (3) ensure the uniform temperature distribution of the battery stack and the implementation of the heat removal scheme, (4) anti-corrosion, (5) uniform distribution of reaction gas, therefore, the requirements for the material of the bipolar plate are: (1) low gas permeability, (2) must be a good conductor of electricity, (3) High thermal conductivity, (4) Corr...

AI Technical Summary

Problems solved by technology

Its disadvantage is that its conductivity is far lower than that of graphite materials and metal plate materials, and the quality of conductivity directly affects the output power of the battery stack, which is a key indicator of fuel cells

In the prior art, in composite material bipolar plates and their manufacturing methods, there are generally two types of composite materials, one is that the conductive fillers are all carbon materials, most of which are different types of graphite, and the bipolar plates produced The mechanical strength of the plate can still meet the requirements, and the bending strength can reach 50-60 MPa, but the electrical conductivity is not ideal, and the highest electrical conductivity is only 6.0×10 4 About S / m; Another class is, has metal material in its conductive filler, and publication number is in the technical scheme disclosed by CN1710738A, also has carbon material powder, metal powder or the mixture of the two in conductive filler, provides from it As can be seen from the examples, the conductivity is only 10 3 S / m, the publication number is that in the disclosed technical scheme of CN1771354A, the conductive filler is embedded in the polymer resin for the fabric of metal wire weaving, does not give specific performance data, and its electrical conductivity should be relatively high; As far as the manufacturing method is concerned, Most of them mix the pretreated raw materials evenly in proportion, and then mold them under a certain temperature, pressure and time, while CN1771354A first extrudes the polymer resin wall, and then laminates and embeds the woven metal wire fabric. The production process is complicated, the cost is high, and it is difficult to carry out mass industrial production

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