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Flexibility enhanced bipolar plate for liquid energy-storing battery and manufacture thereof

A liquid flow energy storage battery and flexible graphite technology, which is applied in the direction of electrode manufacturing, fuel cell parts, active material electrodes, etc., can solve the problems of battery Coulombic efficiency decline, poor mechanical properties, and poor liquid resistance, etc., to achieve Effects of improving assembly conditions, improving mechanical properties, and good liquid resistance

Active Publication Date: 2008-11-19
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the flexible graphite plate is pressed by expanded graphite particles, there will be certain pores in the plate to varying degrees, so the liquid resistance performance is relatively poor, which leads to the electrolyte solution interlinking during the charging and discharging process, and the battery Coulombic efficiency decreases.
Moreover, the relatively poor mechanical properties also limit its application.

Method used

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  • Flexibility enhanced bipolar plate for liquid energy-storing battery and manufacture thereof
  • Flexibility enhanced bipolar plate for liquid energy-storing battery and manufacture thereof
  • Flexibility enhanced bipolar plate for liquid energy-storing battery and manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Get graphite powder 6g, graphite fiber 1g, polypropylene resin powder 3g, stir at high speed for 10 minutes / time, stirring times 2 times, stirring speed 5000 rpm. The obtained mixture was uniformly added to a frame provided with a flexible graphite plate with a thickness of 0.3 mm, and then another flexible graphite plate with a thickness of 0.3 mm was stacked on the graphite and polypropylene mixture layer. Hot pressing at 210°C and 30 MPa pressure for 5 minutes can obtain the reinforced flexible graphite bipolar plate for the flow energy storage battery.

Embodiment 2

[0043] Take 9g of graphite powder and 1g of polyoxymethylene resin powder, stir at high speed for 5 minutes / time, the number of times of stirring is 4 times, and the stirring speed is 2000 rpm. Then weigh 0.2 g of carbon fiber and stir it together with the mixture of graphite and polyoxymethylene at high speed for 10 minutes / time, the number of times of stirring is 2 times, and the stirring speed is 2000 rpm. Add the obtained mixture evenly to the mold frame with a flexible graphite plate with a thickness of 0.5mm, and then stack another flexible graphite plate with a thickness of 0.5mm on the mixture layer of graphite, polyoxymethylene and carbon fiber superior. The reinforced flexible graphite bipolar plate for the flow energy storage battery can be obtained by hot pressing at 190°C and 50 MPa pressure for 10 minutes.

Embodiment 3

[0045] Weigh 8g of carbon black and 2g of polyphenylene ether powder, stir at high speed for 5 minutes / time, 4 times, and the stirring speed is 2000 rpm. The obtained mixture was uniformly added to a mold frame with a flexible graphite plate with a thickness of 0.3 mm, and then another flexible graphite plate with a thickness of 0.3 mm was stacked on the graphite and polyphenylene ether mixture layer. Place them in the order above, and the total number of layers is 5 layers. By hot pressing at 290°C and 30 MPa pressure for 20 minutes, the reinforced flexible graphite bipolar plate for the flow energy storage battery can be obtained.

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Abstract

The invention relates to a redox flow storage battery in chemical storage technology, and in particular relates to a reinforcing soft graphite bipolar plate used in a redox flow storage battery and the fabrication method thereof. The bipolar plate is composed of soft graphite layers and a carbon conductive composite material layer, which are staggered and are spliced together. The external two layers are soft graphite layers. The invention adopts carbon conductive composite material to reinforce the soft graphite plate and introduces heat pressing technique to fabricate a reinforcing soft graphite bipolar plate which is of good conductivity and good liquidity resistance and mechanical property. The reinforcing soft graphite bipolar plate is simple in fabrication technique and the reinforcing soft graphite bipolar plate made through the technique is low in cost and is easy to realize in batch production.

Description

technical field [0001] The invention relates to a liquid flow energy storage battery in chemical energy storage technology, in particular to a reinforced flexible graphite bipolar plate for a liquid flow energy storage battery and a preparation method thereof. Background technique [0002] Electric energy is an indispensable secondary energy for human life and production in modern society. With the development of social economy and the improvement of people's living standards, the demand for electricity is increasing day by day. For the sustainable development of the whole society, the full development and utilization of renewable energy has become a very urgent requirement. In order to ensure the stable power supply of the renewable energy power generation system and make full and effective use of its power generation capacity, it must be regulated by means of power storage. In addition, the peak-shaving and valley-filling and load balancing of the power grid also urgentl...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M8/02
CPCY02E60/50
Inventor 刘宗浩张华民韩希高素军郝玥
Owner DALIAN RONGKE POWER
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