Method, system and method for processing bipolar plate of low-contact resistor and bipolar plate of low-contact resistor

A technology of low contact resistance and processing equipment, which is applied to fuel cell parts, regenerative fuel cells, collectors/separators, etc., can solve the problems of high contact internal resistance and reduce the contact internal resistance of bipolar plates and electrodes, etc. Achieve the effect of increasing discharge power, improving discharge power and voltage efficiency, and reducing contact internal resistance

Active Publication Date: 2015-05-20
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the extrusion molding process, the bipolar plates produced are mainly flat plates, so the contact between the bipolar plates and the porous electrodes is mainly the direct contact between the electrode plane and the carbon fiber. Due to the presence of non-conductive materials on the surface, the contact internal resistance higher (eg figure 1 As shown), there is no effective method to greatly reduce the contact internal resistance between the bipolar plate and the electrode

Method used

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  • Method, system and method for processing bipolar plate of low-contact resistor and bipolar plate of low-contact resistor
  • Method, system and method for processing bipolar plate of low-contact resistor and bipolar plate of low-contact resistor
  • Method, system and method for processing bipolar plate of low-contact resistor and bipolar plate of low-contact resistor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Processing equipment such as Figure 4As shown, it is composed of a pair of thermal insulation heating rollers 13, two pairs of positioning rollers 9 and a pair of shaping rollers 8, and the spraying part 10 between the two pairs of positioning rollers 9. The spraying unit 10 is located on both sides of the surface of the bipolar plate, which can realize the treatment of both sides of the bipolar plate. The side of the spraying part facing the bipolar plate is provided with a nozzle, the other side is provided with a raw material inlet, and a baffle is provided between the positioning roller and the spraying part. ° Angle, its width is advisable to cover the gap between the injection part and the positioning roller. The diameter of the two positioning rollers is 0.3m, and the distance between them is 1.3mm and 0.9mm respectively; the diameter of the two heating rollers is 0.5m, and the distance between them is 0.9mm; The upper and lower sides of the bipolar plate are ...

Embodiment 2

[0044] The size of the processing device is as follows: the diameter of two positioning rollers is 0.3m, and the distance between them is 1mm and 0.8mm respectively; the diameter of two heating rollers is 0.5m and the distance between them is 0.8mm; The side is equipped with a spraying part structure, and the upper part of the spraying part is arranged with three feeding ports side by side. The diameter of the feeding port is 10cm, the diameter of the spraying head is 5mm, the distance between the spraying heads is 10mm, and 50 spraying heads are arranged side by side. Compressed air is used as the conveying gas, and the conveying pressure is 0.08kPa. The powdered carbon material with a particle size of 0.02mm and the bonding agent (mass ratio: 91:9) are continuously injected into the feed port. The powdered carbon material is sprayed and deposited on the surface of the just-prepared bipolar plate, and the spraying frequency is consistent with the running speed of the bipolar p...

Embodiment 3

[0046] The dimensions of the processing device are as in Example 1. Compressed air is used as the conveying gas, and the conveying pressure is 0.08kPa. The powdered carbon material with a particle size of 0.015mm, titanium metal particles and bonding agent (mass ratio: 85:10:5) are continuously injected into the feed port. Under the action of air pressure, the powdered carbon material is sprayed and deposited on the surface of the just-prepared bipolar plate, and the spraying frequency is consistent with the running speed of the bipolar plate. The obtained low contact resistance bipolar plate for the flow battery is as follows: the thickness of the bipolar plate is 0.8 mm, the material is pp+30% carbon, the thickness of the high conductive flexible surface layer increased on both sides is 0.1 mm, and the material of the flexible surface layer is weight Than 85% carbon powder, 10% metal and 5% bonding aid (PvDF). The bipolar plate prepared by this method was assembled on a 3kW...

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Abstract

The invention discloses a device for continuously processing a bipolar plate of a low-contact resistor. The processing device is sequentially provided with one pair of thermal-insulation heating rollers, two pairs of positioning rollers and one pair of sizing rollers along the entering direction of the bipolar plate, wherein two spraying components are arranged between the two pairs of positioning rollers and respectively arranged on both sides of the surface of the bipolar plate. In comparison with the prior art, the internal resistance of the bipolar plate can be decreased and the internal contact resistance of the bipolar plate and other pile components is effectively decreased according to the bipolar plate, so that the discharge power and voltage efficiency of piles are improved, the voltage efficiency can be increased by 2%-4%, and the discharge power is increased by 10%-20% under the same condition. The device can be directly and independently used or installed behind a bipolar plate extrusion die. The operating principle of the device is that a flat-plate bipolar plate enters into the positioning rollers after being heated (kept warm) through the thermal-insulation heater rollers, and flexible powder raw materials are sprayed to the surface of the bipolar plate between the positioning rollers through the spraying components and enter into the sizing rollers, so that the dipolar plate is pressed to achieve a regulated thickness.

Description

technical field [0001] The present invention relates to the technical field of liquid flow batteries, in particular to a processing device, system, method and bipolar plate for low contact resistance bipolar plates. Background technique [0002] With the continuous improvement of people's requirements for environmental protection and sustainable development, new energy power generation technologies such as wind and light have received more and more attention. It is necessary to have a corresponding energy storage system to solve the above problems when using wind, light and other energy sources. The all-vanadium redox flow battery system has become one of the first technologies for large-scale energy storage due to its good reliability and safety, freedom of site selection, and independent design of capacity and power, and has received widespread attention. As the core component of the all-vanadium redox flow battery system, the stack's efficiency directly affects the cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/18
CPCH01M8/0202H01M8/0204H01M8/18Y02E60/50
Inventor 马相坤张华民许晓波姜宏东王正权刘盛林
Owner DALIAN RONGKE POWER
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