Novel bipolar plate for vanadium battery and preparation method of novel bipolar plate

A bipolar plate, vanadium battery technology, applied in battery electrodes, fuel cells, circuits, etc., can solve the problems of high resistivity and high contact resistance of composite bipolar plates, meet the requirements of ensuring consistency, reduce contact resistance, and prepare simple craftsmanship

Active Publication Date: 2015-03-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to propose a novel bipolar plate for vanadium batteries and its preparation method, to solve the problem of high resistivity and contact resistance of polymer-carbon material composite bipolar plates in the prior art. Too big and other problems

Method used

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  • Novel bipolar plate for vanadium battery and preparation method of novel bipolar plate
  • Novel bipolar plate for vanadium battery and preparation method of novel bipolar plate

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preparation example Construction

[0022] The preparation method of the bipolar plate for the vanadium battery, the specific steps are as follows:

[0023] 1) Put the grid-shaped resin plate 2 with through-holes on both sides into the bottom layer of the mold, add conductive fillers and put them into the holes (grids), and make a low-conductivity plastic plate as the skeleton layer after hot pressing. The hot-pressing temperature is 100-300°C (preferably 150-200°C), the hot-pressing time is 5-200min (preferably 10-30min), and the hot-pressing pressure is 0.1-25MPa (preferably 1-20MPa).

[0024] Among them, the conductive filler is carbon fiber powder; or, the conductive filler uses carbon fiber powder as the main agent and conductive carbon black as the auxiliary agent; when carbon fiber powder and conductive carbon black are selected, the mass ratio of the two is (1:1)~(1: 10), the preferred mass ratio is (1:2)-(1:5). The particle size of the conductive carbon black is 10 μm to 500 μm, and the particle size o...

Embodiment 1

[0028] First, take a polyethylene resin plate (PE) (specification: length 300mm×width 300mm×thickness 1mm), first put a grid-shaped polyethylene resin plate with holes on both sides into the bottom layer of the mold, and then choose conductive agent carbon fiber powder 50g and Add 100g of carbon black powder into the hole (grid), close the mold, hot-press at 180°C, 20min for 20min, and 5MPa to obtain a low-conductivity plastic plate with a skeleton layer, then select 1mm thick pure graphite powder and put it into the At the bottom of the mold, put a low-conductivity plastic plate, put 1mm thick pure graphite powder on the conductive plastic plate to close the mold, hot-press temperature is 180°C, hot-press time is 20min, pressure is 15MPa, and a new type of vanadium battery is obtained. bipolar plate.

[0029] In the present embodiment, the technical parameters and performance indicators of the vanadium battery bipolar plate are as follows:

[0030] The volume resistivity of ...

Embodiment 2

[0032] First, take a polypropylene resin board (PP) (specification: length 300mm×width 300mm×thickness 1mm), put a grid-shaped polypropylene resin board with holes on both sides into the bottom of the mold, and then choose conductive agent carbon fiber powder 50g and Add 100g of carbon black powder into the hole, close the mold, hot pressing temperature is 180°C, hot pressing time is 20min, and pressure is 10MPa to obtain a low-conductivity plastic plate with a skeleton layer, then select 2mm thick pure carbon black and put it on the bottom of the mold first, Then put a low-conductivity plastic plate, put 2mm thick pure carbon black on the conductive plastic plate to close the mold, the hot-pressing temperature is 180°C, the hot-pressing time is 20min, and the pressure is 10MPa, and a new bipolar plate for vanadium battery is obtained.

[0033] In the present embodiment, the technical parameters and performance indicators of the vanadium battery bipolar plate are as follows:

...

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Abstract

The invention relates to the field of the manufacture of vanadium batteries, in particular to a novel bipolar plate for a vanadium battery and a preparation method of the novel bipolar plate and solves the problems of great physical internal resistance, low voltage efficiency, uneven voltage of a single piece and the like of the battery in the prior art. The bipolar plate disclosed by the invention consists of four parts, namely a carbon material, a grid-shaped two-side through-hole resin plate, a conductive filler and a carbon material. The grid-shaped two-side through-hole resin plate and the conductive filler are used as a framework layer to be firstly manufactured into a low conductive plastic plate through a hot-press method. Then, the composite carbon materials on both sides of the low conductive plastic plate are subjected to hot press molding again so as to obtain the novel high conductive bipolar plate for the vanadium battery. According to the working requirements of the vanadium battery, for most of the existing bipolar plates, the process of using multiple steps of mixing or stirring and the like is simplified, the preparation process is simple, and only the production device namely a hot press is adopted to complete processing. The bipolar plate disclosed by the invention has high electric conductivity, the contact resistance between electrodes and the bipolar plate is very little, the physical internal resistance of the vanadium battery can be greatly reduced, the energy capacity of the vanadium battery can be increased, and therefore, the cost of the vanadium battery is reduced.

Description

technical field [0001] The invention relates to the field of vanadium battery manufacturing, in particular to a novel bipolar plate for a vanadium battery and a preparation method thereof. Background technique [0002] Vanadium battery, the full name of vanadium ion redox flow battery, is a new type of green battery. The bipolar plate is one of the key components of the all-vanadium redox flow battery. It plays the role of connecting the positive and negative electrodes of different single cells and conducting the internal circuit of the battery. It is required to have good electrical conductivity, high mechanical strength, and electrochemical corrosion resistance. performance. At present, the bipolar plates that can be used in vanadium batteries include graphite plates: high cost, difficult processing, and small size; metal plates: not resistant to corrosion, high cost; conductive plastics: low cost, poor conductivity, and low mechanical strength. To meet the commercializ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/8673H01M4/8864H01M8/188H01M2004/8694Y02E60/50
Inventor 侯绍宇杨志刚刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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