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Bipolar plate and preparation method and application thereof

A bipolar plate and carbon technology, applied to battery electrodes, electrical components, circuits, etc., can solve the problems of limited reduction of contact resistance, volume resistivity, and contact resistance, and achieve small overall voltage drop and surface resistance , low cost effect

Inactive Publication Date: 2016-11-09
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the volume resistivity of bipolar plates made of conductive composite materials is usually less than 0.5Ω.cm, and the body voltage drop of current flowing vertically through the bipolar plates is usually less than 5mV, but the contact resistance voltage drop between graphite felt and bipolar plates Usually around 70mV, to reduce the contact resistance, method one, can be reduced by reducing the volume resistivity, usually the lower the volume resistivity, the smaller the contact resistance, but the conductivity and mechanical strength of the bipolar plate are contradictory, usually At the same time, the electrical conductivity is good, but the mechanical strength is poor. If good mechanical strength is needed, the electrical conductivity must decrease, and the reduction of volume resistivity to reduce the contact resistance is extremely limited, and the effect is not obvious; the second method is to make an integrated electrode. The felt is bonded to the surface of the bipolar plate. This method is not conducive to the subsequent assembly of the stack, and the reduction in contact resistance is limited, and there is no essential reduction

Method used

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  • Bipolar plate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047](1) Weigh polyethylene: maleic anhydride grafted polyethylene: graphite: carbon black according to the mass percentage of 50:20:10:20, and put them into an internal mixer for mixing and banburying at a temperature of 150°C. The speed is 60r / min, and the time is 70min. Among them, the molecular weight of polyethylene is 200,000, the molecular weight of maleic anhydride grafted polyethylene is 200,000, and the grafting rate is 1.5%, the graphite is expanded graphite, and the carbon black is conductive carbon black.

[0048] (2) Put the banburying product into a single-screw machine, extrude, cool, and pelletize to obtain conductive masterbatch. The temperature in the front section of the single-screw machine is 150°C, the temperature in the middle section is 190°C, the temperature in the back end is 210°C, and the screw speed and rotor speed are 40r / min.

[0049] (3) Put the conductive masterbatch into a mold, and perform hot-press molding at a temperature of 150° C. and...

Embodiment 2

[0053] (1) Weigh polyethylene: maleic anhydride grafted polyethylene: graphite: carbon black according to the mass percentage of 30:20:40:10, and put them into an internal mixer for mixing and banburying at a temperature of 180°C. The speed is 40r / min, and the time is 30min. Among them, the molecular weight of polyethylene is 500,000, the molecular weight of polyethylene grafted with maleic anhydride is 500,000, and the grafting ratio is 1.5%, the graphite is conductive graphite, and the carbon black is acetylene black.

[0054] (2) Put the banburying product into a twin-screw machine, extrude, cool, and pelletize to obtain conductive masterbatch. The temperature in the front section of the twin-screw machine is 130°C, the temperature in the middle section is 190°C, the temperature in the back end is 240°C, and the screw speed and rotor speed are 50r / min.

[0055] (3) Put the conductive masterbatch into an injection molding machine, perform injection molding at a temperature...

Embodiment 3

[0059] (1) Weigh polypropylene:maleic anhydride grafted polypropylene:graphite:carbon black according to the mass percentage of 40:20:20:20, and put them into the internal mixer for mixing and banburying at a temperature of 200°C. The speed is 40r / min, and the time is 30min. Among them, the molecular weight of polypropylene is 150,000, the molecular weight of maleic anhydride grafted polypropylene is 150,000, and the grafting rate is 1.6%, the graphite is conductive graphite, and the carbon black is conductive carbon black.

[0060] (2) Put the banburying product into a single-screw machine, extrude, cool, and pelletize to obtain conductive masterbatch. The temperature in the front section of the single-screw machine is 160°C, the temperature in the middle section is 200°C, the temperature in the back end is 240°C, and the screw speed and rotor speed are 50r / min.

[0061] (3) Put the conductive masterbatch into an injection molding machine, perform injection molding at a tem...

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Abstract

The invention provides a bipolar plate and a preparation method and application thereof. The bipolar plate comprises a bipolar plate body and conductive coatings on the two faces of the bipolar plate body, wherein the carrying capacity of the conductive coatings on the bipolar plate body per square centimeter is 3-10 mg. The bipolar plate has low surface resistance, is a good galvanic pile preparation material and has very good application prospects.

Description

technical field [0001] The invention relates to a bipolar plate and its preparation method and application. Background technique [0002] Petrochemical energy is being exhausted day by day. In response to the energy crisis, countries around the world are actively exploring the development and utilization of new energy sources, such as wind power and solar energy, which have begun to take shape. Wind energy and photovoltaic energy are clean, non-polluting, inexhaustible, inexhaustible, and environmentally friendly; however, wind energy and photovoltaic energy have inherent disadvantages, such as randomness, discontinuity, and non-schedulability These shortcomings limit the grid connection of wind power and photovoltaic power generation, thereby reducing the utilization rate of resources, resulting in frequent occurrence of "abandoned wind" and other phenomena. [0003] In order to solve the above-mentioned waste of resources, an energy storage system is connected between new...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8631H01M4/88Y02E60/50
Inventor 汪保国钱汇东李军邹志青周毅杨辉
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI