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Plastic bipolar plate and preparation method thereof

A bipolar plate and plastic technology, applied in fuel cells, final product manufacturing, fuel cell components, etc., can solve the problems of difficult to obtain bipolar plates with comprehensive performance, difficult to apply on a large scale, poor chemical corrosion resistance, etc. Achieve the effect of improving interfacial compatibility, low cost of raw materials and equipment, enhancing corrosion resistance and mechanical strength

Inactive Publication Date: 2018-06-08
SHENZHEN JINGTE INTELLIGENT MFG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical and electrical conductivity of metal bipolar plates are significantly better than other types of bipolar plates, and they also have good machinability, but a series of problems such as high material cost and poor chemical corrosion resistance limit some of their application markets. It is difficult to realize large-scale application within a short period of time; the cost of plastic bipolar is low, and the performance of the bipolar plate can be adjusted by adjusting the ratio of resin and conductive filler, but it is difficult to reconcile the conductivity and mechanical strength of this type of bipolar plate However, it is difficult to obtain bipolar plates with excellent comprehensive performance; graphite bipolar plates are completely made of graphite materials through a certain molding process, and have good conductivity, but the production process is relatively complicated and the preparation cost is high. The heap field is also difficult to promote

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Choose polyethylene particles with a size of 2.0mm×2.0mm as the resin material, choose carbon fiber with a size of 0.1mm×1.0mm as the conductive material; choose metal aluminum sheet functional materials with a size of 0.6mm×2.0mm; the mass ratio of the three For 40:45:15. After the three materials were weighed, they were continuously processed for 4 hours on a ball mill with a rotating speed of 1200 rpm to obtain a uniformly dispersed mixture.

[0023] The mixture was flattened into a thin layer with a thickness of 30mm in the mold, and kept preheated at 130°C for 10 minutes, then the temperature was raised to 220°C, and kept pressed at a pressure of 85MPa for 15 minutes, and finally a new type of plastic bipolar plate was obtained.

[0024] Performance evaluation of plastic bipolar plates.

[0025] Thickness: 1.4mm;

[0026] Tensile strength: about 42MPa; bending strength: about 35MPa;

[0027] Electronic conductivity: about 140S / cm.

Embodiment 2

[0029] Select polypropylene particles with a size of 1.0mm×1.2mm as the resin material, choose carbon tubes with a size of 0.5mm×4.0mm as the conductive material; choose stainless steel fibers with a size of 1.2mm×4.0mm as the functional material; the quality of the three The ratio is 30:65:5. After the three materials were weighed, they were continuously processed for 12 hours on a mechanical mixer with a rotating speed of 200 rpm to obtain a uniformly dispersed mixture.

[0030] The mixture was flattened into a thin layer with a thickness of 60mm in the mold, and kept preheated at 180°C for 15 minutes, then the temperature was raised to 260°C, and kept pressed at a pressure of 55MPa for 10 minutes, and finally a new type of plastic bipolar plate was obtained.

[0031] Performance evaluation of plastic bipolar plates.

[0032] Thickness: 2.5mm;

[0033] Tensile strength: about 32MPa; bending strength: about 36MPa;

[0034] Electronic conductivity: about 155S / cm.

Embodiment 3

[0036] Select polyphenylene sulfide particles with a size of 1.0mm×1.0mm as the resin material, select activated carbon with a size of 0.8mm×0.8mm as the conductive material; choose star-shaped magnesium oxide with a size of 3.0mm×3.0mm as the functional material; three The mass ratio of the latter is 20:70:10. The three materials were weighed and placed in excess absolute ethanol, and treated continuously in ultrasonic for 2 hours to obtain a uniformly dispersed mixture.

[0037] The mixture was flattened into a thin layer with a thickness of 40mm in the mold, and kept preheated at 180°C for 20 minutes, then the temperature was raised to 360°C, and kept pressed at a pressure of 45MPa for 10 minutes, and finally a new type of plastic bipolar plate was obtained.

[0038] Performance evaluation of plastic bipolar plates.

[0039] Thickness: 1.8mm; tensile strength: about 55MPa.

[0040] Bending strength: about 42MPa; electronic conductivity: about 164S / cm.

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Abstract

The invention relates to the field of the preparation of bipolar plates for power supplies, and particularly relates to a plastic bipolar plate and a preparation method thereof. The bipolar plate is prepared from three parts of a conducting material, a resin material and a functional material. The preparation method comprises the following main steps of forcibly mixing the conducting material, theresin material and the functional material, which are in a certain proportion, in a high speed ball mill, and carrying out compression molding on the uniformly mixed materials in a mold at a high temperature, so as to obtain the novel plastic bipolar plate. The plastic bipolar plate can be used for resolving the contradiction between the conductivity and the mechanical performance of a conventional plastic bipolar plate; while the strength and the corrosion resistance of the bipolar plate are improved, the conductivity of the bipolar plate is further ameliorated; further, the bipolar plate prepared by the method has the characteristics of being simple in process and low in raw-material and equipment cost, and the large-scale industrialized production is easily realized.

Description

technical field [0001] The invention relates to the field of preparation of bipolar plates for chemical power sources, in particular to a plastic bipolar plate and a preparation method thereof. Background technique [0002] A large-scale fuel cell stack is composed of several or dozens of individual fuel cells connected in series or in parallel in a certain way to meet the working current density current or working voltage of the specified size output by the stack. The components connected to each other between different single cells are bipolar plates, also known as collector plates. The bipolar plate is used as a special wire to connect the positive and negative electrodes of different single batteries with each other. At the same time, its compactness can completely isolate the strong oxidizing materials and strong reducing materials in the single batteries, preventing them from contacting and causing battery short circuit. The above-mentioned functions put forward the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0226H01M8/0206H01M8/0208H01M8/021H01M8/0213H01M8/0215
CPCH01M8/0206H01M8/0208H01M8/021H01M8/0213H01M8/0215H01M8/0226Y02E60/50Y02P70/50
Inventor 不公告发明人
Owner SHENZHEN JINGTE INTELLIGENT MFG TECH CO LTD
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