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Weldable bipolar plate for flow battery and preparation and application thereof

A technology of flow battery and all-vanadium flow battery, which is applied to fuel cells, regenerative fuel cells, and components of fuel cells, etc. Inability to form conductive paths and other problems, to achieve the effect of easy production process, improved voltage efficiency, and guaranteed reliability

Inactive Publication Date: 2020-06-09
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, such bipolar plate materials have poor conductivity, especially because they contain more non-conductive polymers, so that the surface of the bipolar plate is composed of conductive particles and most of the non-conductive polymers. The point is in contact with the non-conductive polymer, which cannot form a conductive path, resulting in a large contact resistance between the bipolar plate and the electrode material, which increases the ohmic internal resistance of the battery and reduces the performance of the battery.

Method used

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  • Weldable bipolar plate for flow battery and preparation and application thereof
  • Weldable bipolar plate for flow battery and preparation and application thereof
  • Weldable bipolar plate for flow battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take by weighing high-density polyethylene (melt index is 0.5) 0.78kg, carbon nanotube 0.2kg, titanate coupling agent 10g, polyethylene wax 5g, zinc stearate 5g, wherein, carbon nanotube diameter is 20- 30nm, length 15-50μm, purity 99%, specific surface area 160m 2 / g. After mixing the above materials, put them into the banbury mixer, the banbury temperature is 200°C, the rotor speed is 40r / min, and the banbury time is 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and then sent to a single-screw extruder. The barrel temperature of the extruder is 200°C, the speed of the main engine is 15rpm, and the die temperature is 230°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 0.8 mm was formed.

[0034] Weigh 90g of nano-graphite powder and 10g of PVDF, add it to 1L of ethanol, stir and mix evenly, use a 100μm spatula to scrape it on the surface of the carbon-plastic composite board, an...

Embodiment 2

[0038] Weigh high-density polyethylene (melt index is 0.05) 0.83kg, carbon nanotube 0.15kg, aminopropyltriethoxysilane coupling agent 10g, polyethylene wax 5g, zinc stearate 5g, wherein, carbon nanotube The diameter of the tube is 15-30nm, the length is 15-30μm, the purity is 99%, and the specific surface area is 200m 2 / g. Mix the above materials and put them into a banbury mixer, the banbury temperature is 200°C, the rotor speed is 45r / min, and the banbury time is 20 minutes. Then, the evenly mixed banbury material is pulverized by a pulverizer and sent to a single-screw extruder. The temperature of the barrel of the extruder is 200°C, the speed of the main engine is 15rpm, and the temperature of the die is 230°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 1mm was formed.

[0039] Weigh 88g of carbon fiber powder and 12g of PVDF, add it to 1L NMP, stir and mix evenly, scrape it on the surface of the carbon-plastic com...

Embodiment 3

[0041] Weigh respectively high-density polyethylene (melt index is 1) 0.8kg, carbon nanotube 0.18kg, aluminate coupling agent 10g, calcium stearate 10g, wherein, carbon nanotube diameter is 20-30nm, length is 15 -50μm, purity 99%, specific surface area 160m 2 / g. After mixing the above materials, put them into the banbury mixer, the banbury temperature is 220°C, the rotor speed is 50r / min, and the banbury time is 20 minutes. Then, the homogeneous mixing material is pulverized by a pulverizer and sent to a single-screw extruder. The temperature of the barrel of the extruder is 230°C, the speed of the main engine is 8rpm, and the temperature of the die is 200°C. The sheet is extruded and calendered. A carbon-plastic composite bipolar plate with a thickness of 0.5 mm was formed.

[0042] Weigh 95g of graphite powder and 5g of PVDF, add it to 1L of NMP, stir and mix evenly, use a 150μm spatula to scrape it on the surface of the carbon-plastic composite board, then dry and remove...

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Abstract

The invention relates to a weldable bipolar plate for a flow battery and preparation and application thereof. The weldable bipolar plate comprises a main body layer consisting of high-density polyethylene, carbon nanotubes, a coupling agent and a lubricant, and the areas, in contact with the electrode, in the middle parts of the upper and lower surfaces of the main body layer are provided with high-conductivity coatings. The area, in contact with the electrode material, on the bipolar plate has relatively high conductivity and low contact resistance, so that the ohmic polarization of the battery is reduced, and the voltage efficiency of the battery is improved; and the contact area with the electrode frame has relatively high polymer content, so that enough high welding strength can be ensured during welding, and the sealing reliability of a galvanic pile is ensured.

Description

technical field [0001] The invention relates to the field of liquid flow batteries in chemical energy storage technology, in particular to a bipolar plate of a liquid flow battery and a preparation method thereof. Background technique [0002] Due to its independent output power and capacity, the all-vanadium redox flow battery has flexible system design; high energy efficiency, long life, high operation stability and reliability, and low self-discharge; large degree of freedom in site selection, no pollution, and simple maintenance. With the advantages of 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 power generation systems such as solar energy and wind energy. There are significant demands in power generation and smart grid construction. [0003] As a key component of the flow battery, the bip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0234H01M8/0239H01M8/0245H01M8/0273H01M8/0286H01M8/18B82Y30/00
CPCB82Y30/00H01M8/0234H01M8/0239H01M8/0245H01M8/0273H01M8/0286H01M8/188Y02E60/50
Inventor 刘涛李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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