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Bipolar plate for liquid flow energy storage battery and preparation method thereof

A bipolar plate and composite plate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of reducing contact resistance, unable to ensure that the porous electrode and bipolar plate form a conductive path, and the improvement of voltage efficiency and energy efficiency is limited. and other problems, to achieve the effects of reducing contact resistance, easy batch preparation, and low price

Active Publication Date: 2016-01-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the conductive bonding material is also mixed with conductive fillers and organic polymers, it cannot be guaranteed that each contact point between the porous electrode and the bipolar plate can form a conductive path, so that the contact resistance cannot be minimized, so Limited improvements in voltage efficiency and energy efficiency

Method used

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  • Bipolar plate for liquid flow energy storage battery and preparation method thereof

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Effect test

Embodiment 1

[0035] Weigh 5 kg of polypropylene and 5 kg of graphite powder respectively, and add them to a high-speed stirrer at a stirring speed of 3000 rpm, for 10 minutes, and twice. Then it was sent into a twin-screw extruder for mixing and granulation to obtain a conductive masterbatch. The mixing temperature was 220° C. and the mixing time was 20 minutes. Then, the conductive masterbatch was fed into the extruder, and the temperature of the head of the extruder was 220°C, and the sheet was extruded and calendered to obtain a 1mm thick carbon-plastic composite board.

[0036] Weigh 100g of graphite powder, add it to 1L of ethanol, stir and mix evenly, use a spatula to scrape it on the surface of the carbon-plastic composite board with a thickness of 100μm, then dry to remove the ethanol; then put it into a mold and heat press it. The hot-pressing temperature is 200° C., the hot-pressing pressure is 20 MPa, and the hot-pressing time is 5 minutes. The thickness of the conductive layer...

Embodiment 2

[0043]Weigh 50 g of polypropylene and 50 g of graphite powder respectively, and add them into a high-speed stirrer at a stirring speed of 3000 rpm, for 10 minutes, and twice. Then put the uniformly mixed powder into the mold, raise the temperature to 220°C and keep it for 15 minutes, apply a pressure of 20MPa and keep it for 30 minutes, then cool and demould to obtain a 1mm thick carbon-plastic composite board.

[0044] Weigh 2g of graphite powder and 0.2g of polyvinylidene fluoride, add it to 20ml of N-methylpyrrolidone, stir and mix evenly, scrape it on the surface of the carbon-plastic composite board with a 100μm scraper, and then dry to remove ethanol; then put it into In the mold, thermoforming. The hot-pressing temperature is 200° C., the hot-pressing pressure is 20 MPa, and the hot-pressing time is 5 minutes. The thickness of the conductive layer after hot pressing is 40 μm.

[0045] Use the bipolar plate of this embodiment to assemble into an all-vanadium flow cell,...

Embodiment 3

[0047] Weigh 5 kg of polyvinyl chloride resin and 5 kg of carbon black, respectively, and add them to a high-speed stirrer at a stirring speed of 2500 rpm for 10 minutes and twice. Then, it is sent into a twin-screw extruder for mixing and granulation to obtain a conductive masterbatch. The mixing temperature is 180° C. and the mixing time is 10 minutes. Then the conductive masterbatch is sent into the extruder, the temperature of the head of the extruder is 200°C, the sheet is extruded and calendered to form a carbon-plastic composite board.

[0048] Weigh 100g of graphite powder, add it to 1L of ethanol, stir and mix evenly, scrape it on the surface of the carbon-plastic composite board with a 100μm scraper, then dry to remove the ethanol; then put it into a mold and heat press it. The hot-pressing temperature is 200° C., the hot-pressing pressure is 20 MPa, and the hot-pressing time is 5 minutes. The thickness of the conductive layer after hot pressing is 50 μm.

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Abstract

The invention relates to a bipolar plate for a liquid flow energy storage battery and a preparation method. The bipolar plate employs a carbon plastic composite plate with a thickness of 0.5-5mm as a matrix material. Conducting layers with a thickness of 1-1000 microns are coated on the surface of one side or surfaces of two sides of the matrix. The bipolar plate combines advantages of the carbon plastic composite plate and a graphite plate, decreases the contact resistance between an electrode and the bipolar plate, and finally decreases the Ohm internal resistance of the liquid flow energy storage battery. The bipolar plate raises the energy efficiency and the voltage efficiency of the liquid flow energy storage battery, and therefore the working current density is increased, thus weight, volume and cost of a battery with the same output power are all decreased.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to a bipolar plate of a liquid flow energy storage battery and a preparation method thereof. Background technique [0002] All-vanadium redox flow energy storage battery has independent output power and capacity, flexible system design; high energy efficiency, long life, high operation stability and reliability, low self-discharge; large degree of freedom in site selection, no pollution, easy maintenance It has the advantages of simplicity, low operating cost, and high safety. It has broad development prospects in large-scale energy storage. It is considered to be an effective method to solve the random and intermittent unsteady characteristics of renewable energy generation systems such as solar energy and wind energy. There are significant demands in renewable energy power generation and smart grid construction. [0003] As...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8631H01M4/8668H01M4/8673H01M4/8875Y02E60/50
Inventor 张华民刘涛姚川
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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