CN110970634B - Electrode frame for all-vanadium redox flow battery and application - Google Patents
Electrode frame for all-vanadium redox flow battery and application Download PDFInfo
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- CN110970634B CN110970634B CN201811149155.6A CN201811149155A CN110970634B CN 110970634 B CN110970634 B CN 110970634B CN 201811149155 A CN201811149155 A CN 201811149155A CN 110970634 B CN110970634 B CN 110970634B
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- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 15
- 239000003792 electrolyte Substances 0.000 claims abstract description 92
- 239000007788 liquid Substances 0.000 claims abstract description 73
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 6
- 239000004800 polyvinyl chloride Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 4
- 238000004146 energy storage Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention relates to the technical field of energy storage of flow batteries, in particular to an electrode frame for an all-vanadium flow battery, which is a rectangular flat plate, wherein an electrolyte inlet and an electrolyte outlet are arranged at four corners of the electrode frame; the middle part is provided with a through hole for accommodating the porous electrode; liquid distribution grooves are respectively arranged on the surface of one side of the electrode frame and opposite to the two sides of the middle through hole; the electrolyte outlet is positioned at the left upper part of the flat plate, the outlet main runner groove is divided into an upper part and a lower part, the liquid outlet distribution groove is divided into a left part and a right part, the outlet main runner groove at the upper part is communicated with the upper half part of the electrolyte outlet, and the outlet main runner groove at the lower part is communicated with the lower half part of the electrolyte outlet; the right end of the outlet main runner groove at the upper part is communicated with the left end of the liquid outlet distribution groove at the right side, and the right end of the outlet main runner groove at the lower part is communicated with the left end of the liquid outlet distribution groove at the left side; the electrolyte inlet and the electrolyte outlet are symmetrical. The invention increases the electrolyte flow area; the flow resistance is reduced.
Description
Technical Field
The invention relates to the technical field of energy storage of flow batteries, in particular to the field of all-vanadium flow batteries.
Background
The all-vanadium redox flow battery is a redox flow battery energy storage technology with high efficiency, high reliability and long service life, has higher power density, and is simple and easy to operate. The electrolyte is stored in the electrolyte tank outside the stack, and the energy storage capacity can be increased by increasing the electrolyte storage amount. The method is mainly applied to the fields of power grid peak shaving, renewable energy power generation such as wind energy and solar energy, and the like. The electrode frame is used as an important component in the galvanic pile structure, and is used for bearing the carbon-plastic composite bipolar plate and the diaphragm, and realizing the sealing and distributing functions of electrolyte. The electrode frame of the existing all-vanadium redox flow battery has the following defects: 1. the flow area of the grooves of the main flow channel of the electrolyte inlet and outlet is small, the flow resistance is large, the flow rate of the electric pile is reduced, and the flow rate of the electrolyte is reduced; 2. the inlet and outlet main runner grooves on the electrode frame have larger deflection, so that larger flow resistance is caused, and the flow velocity of electrolyte is reduced; 3. the flow area of the inlet and outlet liquid dividing channels is small, and the flow velocity of the electrolyte is reduced by adopting a gradually expanding design. Because the full vanadium redox flow battery has deeper charge and discharge depth, if the flow rate of the electrolyte is too low, concentration polarization in the electrode is larger at the end of charge and discharge, and the battery performance is reduced.
Disclosure of Invention
The invention provides an electrode frame of an all-vanadium redox flow battery for solving the technical problems. The electrode frame material is PVC polyvinyl chloride, which is easy to process. The grooves of the main flow channels of the electrolyte inlet and outlet are divided into an upper part and a lower part, so that the flow area of the electrolyte is greatly increased; the bending angle of the main runner is reduced, and the flow resistance is reduced; the flow area of the inlet and outlet liquid dividing channels is increased, and the tapered design is adopted, so that the electrolyte is accelerated secondarily.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the electrode frame is a rectangular flat plate; through holes are respectively arranged at the edges of the electrode frame, which are close to four corners, and the four through holes are respectively used as an electrolyte inlet and an electrolyte outlet; a hollow rectangular middle through hole capable of accommodating the porous electrode is arranged in the middle of the rectangular flat plate; an upper liquid distribution groove and a lower liquid distribution groove are respectively arranged on the surface of one side of the electrode frame and the surface of the electrode frame close to two opposite sides of the through hole in the middle of the rectangle and are respectively used as an electrolyte inlet liquid distribution groove and an electrolyte outlet liquid distribution groove, the inlet liquid distribution groove is communicated with an electrolyte inlet through an inlet main runner groove, and the outlet liquid distribution groove is communicated with an electrolyte outlet through an outlet main runner groove; the liquid inlet distribution groove is communicated with the middle through hole through the inlet liquid distribution channel, and the liquid outlet distribution groove is communicated with the middle through hole through the outlet liquid distribution channel (or groove). The electrolyte outlet is positioned at the left upper part of the flat plate, the outlet main runner groove is divided into an upper part and a lower part, the liquid outlet distribution groove is divided into a left part and a right part, the outlet main runner groove at the upper part is communicated with the upper half part of the electrolyte outlet, and the outlet main runner groove at the lower part is communicated with the lower half part of the electrolyte outlet; the right end of the outlet main runner groove at the upper part is communicated with the left end of the liquid outlet distribution groove at the right side, and the right end of the outlet main runner groove at the lower part is communicated with the left end of the liquid outlet distribution groove at the left side; the cross section of the outlet liquid-separating channel parallel to the rectangular flat plate surface is in an inverted trapezoid shape, and the liquid outlet distributing groove is communicated with the middle through hole through the outlet liquid-separating channel. The electrolyte inlet is positioned at the right lower part of the flat plate, the inlet main runner groove is divided into an upper part and a lower part, the liquid inlet distribution groove is divided into a left part and a right part, the inlet main runner groove at the upper part is communicated with the upper half part of the electrolyte inlet, and the inlet main runner groove at the lower part is communicated with the lower half part of the electrolyte inlet; the left end of the inlet main runner groove at the upper part is communicated with the right end of the liquid inlet distribution groove at the right side, and the left end of the inlet main runner groove at the lower part is communicated with the right end of the liquid inlet distribution groove at the left side; the cross section of the inlet liquid separating flow passage parallel to the rectangular flat plate surface is trapezoid, and the liquid inlet distribution groove is communicated with the middle through hole through the inlet liquid separating flow passage. The 180-degree arc angle area where the upper half part of the electrolyte outlet is positioned is communicated with the outlet main runner groove at the upper part; the arc angle area of 120-180 degrees where the lower half part of the electrolyte outlet is positioned is communicated with the outlet main runner groove at the lower part; the arc angle area of 120-180 degrees where the upper half part of the electrolyte inlet is positioned is communicated with the inlet main runner groove at the upper part; the 180-degree arc angle area of the lower half part of the electrolyte inlet is communicated with the inlet main runner groove at the lower part. And cover plates are arranged on the outlet main runner groove, the liquid outlet distribution groove, the outlet sub-liquid runner, the inlet main runner groove, the liquid inlet distribution groove and the inlet sub-liquid runner, so that the runner is prevented from being blocked when the sealing gasket is pressed.
Compared with the prior art, the invention has the following technical effects:
the grooves of the electrolyte inlet and outlet main channels are divided into an upper part and a lower part, and compared with the prior art, the flow area of the grooves of the inlet and outlet main channels is improved by 75%; meanwhile, as the left end of the inlet main runner groove at the upper part is communicated with the right end of the liquid inlet distribution groove at the right side, the right end of the outlet main runner groove at the lower part is communicated with the left end of the liquid outlet distribution groove at the left side, the turning angle of the main runner groove is reduced, the flow resistance is reduced, and the electrolyte is distributed more uniformly when reaching the liquid distribution runner. Besides, the flow area of the inlet liquid-dividing flow channel is increased, and the tapered design is adopted, so that the flow rate of the electrolyte is increased, and meanwhile, the electrolyte can be accelerated secondarily, and the flow speed of the electrolyte in the electrode is further increased. Because the flow of the upper inlet main runner groove and the lower outlet main runner groove is shorter than that of the lower inlet main runner groove and the upper outlet main runner groove, the communication angles of the upper inlet main runner groove and the lower outlet main runner groove as well as the cathode electrolyte inlet and outlet through holes can be adjusted according to the attribute of electrolyte, so that the purpose of balancing flow resistance of the upper inlet main runner groove and the lower inlet main runner groove and the flow resistance of the upper outlet main runner groove and the flow resistance of the lower outlet main runner groove are achieved, and the flow uniformity of the electrolyte is better. The invention greatly reduces the resistance of the electrode frame to the flow of electrolyte, can improve the flow of the electrolyte passing through the all-vanadium redox flow battery, increase the flow speed of the electrolyte, enhance the mass transfer, reduce the concentration polarization and improve the performance of the battery under the condition of ensuring the constant lift of the electrolyte pump.
Drawings
Fig. 1 illustrates a conventional electrode frame structure.
Fig. 2 shows an electrode frame structure according to an embodiment of the present invention.
Detailed Description
Comparative example
The conventional electrode frame structure of the all-vanadium redox flow battery is shown in fig. 1. Through holes are respectively arranged at the edges of the electrode frame, which are close to four corners, and the four through holes are respectively used as an electrolyte inlet and an electrolyte outlet; a hollow rectangular middle through hole capable of accommodating the porous electrode is arranged in the middle of the rectangular flat plate; an upper liquid distribution groove and a lower liquid distribution groove are respectively arranged on the surface of one side of the electrode frame and the surface of the electrode frame close to two opposite sides of the through hole in the middle of the rectangle and are respectively used as an electrolyte inlet liquid distribution groove and an electrolyte outlet liquid distribution groove, the inlet liquid distribution groove is communicated with an electrolyte inlet through an inlet main runner groove, and the outlet liquid distribution groove is communicated with an electrolyte outlet through an outlet main runner groove; the liquid inlet distribution groove is communicated with the middle through hole through the inlet liquid distribution channel, and the liquid outlet distribution groove is communicated with the middle through hole through the outlet liquid distribution channel (or groove); the electrode frame acts as a pole of the battery to both organize the flow of electrolyte and support the electrode during operation. The electrolyte inlet cross-sectional length was 16.75mm. And part of electrolyte flows to the center of the electrode frame through the electrolyte inlet through hole, flows into the inlet sub-liquid flow channel through the inlet main flow channel groove and flows into the inlet distribution groove. After the electrolyte reacts in the porous electrode area, the electrolyte flows to the center of the electrode frame through the outlet distribution grooves and flows out of the electrode frame through the outlet main runner grooves. The cross section width of the grooves of the inlet and outlet main channels is 8mm. The inlet liquid-separating flow channel and the outlet liquid-separating flow channel are designed in a gradually expanding way, and the cross section width of the junctions of the inlet liquid-separating flow channel, the outlet liquid-separating flow channel and the porous electrode is 3mm. The frame body material is PVC.
Electrode area: 875cm 2 。
Number of galvanic pile: section 10
Current density: 80mA/cm 2 Charge cutoff voltage: 15.5V, discharge cut-off voltage: 10V
The coulomb efficiency of charge and discharge of the galvanic pile is 99.1%, the voltage efficiency is 87.2%, and the energy efficiency is 86.4%
Examples
The electrode frame of the all-vanadium redox flow battery is shown in figure 2. In the embodiment, the length of the section of the electrolyte inlet is 31.4mm-37.7mm, a part of electrolyte flows into the inlet liquid-dividing flow channel through the electrolyte inlet through hole and the right inlet distribution flow channel groove through the upper inlet main flow channel groove, the inlet liquid-dividing flow channel adopts a tapered design, the electrolyte enters the right half electrode frame after being accelerated for the second time, and the rest of electrolyte flows into the inlet liquid-dividing flow channel along the lower inlet main flow channel groove and flows into the left half electrode frame after being accelerated for the second time through the left inlet distribution flow channel groove inlet. After the electrolyte reacts in the porous electrode region, a part of the electrolyte flows out of the electrode frame through the lower outlet main runner and the left outlet distribution runner groove, and the rest of the electrolyte flows out of the electrode frame through the right outlet distribution runner groove and the upper outlet main runner groove. The total width of the flow channel section of the inlet main flow channel groove and the outlet main flow channel groove is 14mm, the inlet liquid dividing flow channel adopts a tapered design, and the cross section width of the interface of the inlet liquid dividing flow channel, the outlet liquid dividing flow channel and the porous electrode is 6mm. The frame body material is PVC.
In the embodiment, the communication area of the electrolyte inlet and outlet main runner grooves and the electrolyte inlet and outlet through holes is 1.87-2.25 times that of the comparative example, the flow cross-sectional area of the inlet and outlet main runner grooves is 1.75 times that of the comparative example, and the cross-sectional areas of the interfaces of the inlet and outlet liquid separating runners and the porous electrode are 2 times that of the comparative example. The inlet and outlet distribution runner grooves avoid larger deflection, greatly reduce the flow resistance of the electrolyte flowing in the electrode frame, and increase the flow rate of the electrolyte and the flow velocity of the electrolyte under the condition of unchanged lift of the flow pump. The inlet liquid dividing channel adopts a tapered design, so that a secondary acceleration effect is achieved on the electrolyte, and the flow speed of the electrolyte is further improved.
Electrode area: 875cm 2 。
Number of galvanic pile: section 10
Current density: 80mA/cm 2 Charge cutoff voltage: 15.5V, discharge cut-off voltage: 10V
The coulomb efficiency of charge and discharge of the galvanic pile is 99.3%, the voltage efficiency is 89.2%, and the energy efficiency is 88.6%
Table 1: battery performance comparison
| Stack number | Coulombic efficiency% | Voltage efficiency% | Energy efficiency% |
| Comparative example | 99.1 | 87.2 | 86.4 |
| Examples | 99.2 | 89.2 | 88.6 |
The comparison of the battery performance shows that the performance of the all-vanadium redox flow battery adopting the electrode frame is obviously better than that of the all-vanadium redox flow battery adopting the traditional electrode frame, so that the electrode frame can effectively improve the flow rate of electrolyte, enhance the mass transfer capacity of active substances in the electrode, reduce concentration polarization and improve the battery performance.
Claims (4)
1. The electrode frame for the all-vanadium redox flow battery is a rectangular flat plate, through holes are respectively formed in edges, close to four corners, of the electrode frame, and the through holes are respectively used as an electrolyte inlet and an electrolyte outlet; a hollow rectangular middle through hole capable of accommodating the porous electrode is arranged in the middle of the rectangular flat plate; an upper liquid distribution groove and a lower liquid distribution groove are respectively arranged on the surface of one side of the electrode frame and the surface of the electrode frame close to two opposite sides of the through hole in the middle of the rectangle and are respectively used as an electrolyte inlet liquid distribution groove and an electrolyte outlet liquid distribution groove, the inlet liquid distribution groove is communicated with an electrolyte inlet through an inlet main runner groove, and the outlet liquid distribution groove is communicated with an electrolyte outlet through an outlet main runner groove; the liquid inlet distribution groove is communicated with the middle through hole through the inlet liquid separation flow passage or the groove, and the liquid outlet distribution groove is communicated with the middle through hole through the outlet liquid separation flow passage or the groove;
the method is characterized in that: the electrolyte outlet is positioned at the left upper part of the flat plate, the outlet main runner groove is divided into an upper part and a lower part, the liquid outlet distribution groove is divided into a left part and a right part, the outlet main runner groove at the upper part is communicated with the upper half part of the electrolyte outlet, and the outlet main runner groove at the lower part is communicated with the lower half part of the electrolyte outlet; the right end of the outlet main runner groove at the upper part is communicated with the left end of the liquid outlet distribution groove at the right side, and the right end of the outlet main runner groove at the lower part is communicated with the left end of the liquid outlet distribution groove at the left side; the cross section of the outlet liquid separation channel parallel to the rectangular flat plate surface is in an inverted trapezoid shape, and the liquid outlet distribution groove is communicated with the middle through hole through the outlet liquid separation channel;
the electrolyte inlet is positioned at the right lower part of the flat plate, the inlet main runner groove is divided into an upper part and a lower part, the liquid inlet distribution groove is divided into a left part and a right part, the inlet main runner groove at the upper part is communicated with the upper half part of the electrolyte inlet, and the inlet main runner groove at the lower part is communicated with the lower half part of the electrolyte inlet; the left end of the inlet main runner groove at the upper part is communicated with the right end of the liquid inlet distribution groove at the right side, and the left end of the inlet main runner groove at the lower part is communicated with the right end of the liquid inlet distribution groove at the left side; the section of the inlet liquid-separating flow passage parallel to the rectangular flat plate surface is trapezoid, the liquid inlet distributing groove is communicated with the middle through hole through the inlet liquid-separating flow passage,
PVC polyvinyl chloride is selected as the electrode frame material.
2. The electrode frame of claim 1, wherein: the 180-degree arc angle area where the upper half part of the electrolyte outlet is positioned is communicated with the outlet main runner groove at the upper part; the arc angle area of 120-180 degrees where the lower half part of the electrolyte outlet is positioned is communicated with the outlet main runner groove at the lower part;
the arc angle area of 120-180 degrees where the upper half part of the electrolyte inlet is positioned is communicated with the inlet main runner groove at the upper part; the 180-degree arc angle area of the lower half part of the electrolyte inlet is communicated with the inlet main runner groove at the lower part.
3. The electrode frame of claim 1, wherein: and cover plates are arranged on the outlet main runner groove, the liquid outlet distribution groove, the outlet sub-liquid runner, the inlet main runner groove, the liquid inlet distribution groove and the inlet sub-liquid runner, so that the runner is prevented from being blocked when the sealing gasket is pressed.
4. Use of an electrode frame according to any one of claims 1-3 in an all-vanadium redox flow battery.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101667646A (en) * | 2008-09-03 | 2010-03-10 | 中国科学院大连化学物理研究所 | Electrode frame structure for redox flow cell |
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| CN101587959B (en) * | 2008-05-23 | 2012-05-16 | 大连融科储能技术发展有限公司 | Electrode frame and all-vanadium redox flow battery pile |
| US8808897B2 (en) * | 2011-07-19 | 2014-08-19 | Fu Jen Catholic University | Electrode structure of vanadium redox flow battery |
| CN102522577B (en) * | 2011-12-31 | 2014-02-19 | 中国东方电气集团有限公司 | Current collecting plates and liquid stream battery stack adopting same |
| KR20170034995A (en) * | 2015-09-21 | 2017-03-30 | 전자부품연구원 | Flow flame and redox flow secondary battery having the same |
| CN204966600U (en) * | 2015-09-22 | 2016-01-13 | 中国科学院金属研究所 | Full vanadium redox flow battery is with asymmetric electrode frame |
| KR20170127848A (en) * | 2016-05-13 | 2017-11-22 | 주식회사케이세라셀 | The Redox flow battery including inner cover |
| JP2017208272A (en) * | 2016-05-19 | 2017-11-24 | 住友電気工業株式会社 | Redox flow battery |
| CN107845823B (en) * | 2016-09-21 | 2023-08-22 | 中国科学院大连化学物理研究所 | Electrode frame structure of flow battery pile |
| US10615432B2 (en) * | 2016-11-16 | 2020-04-07 | Sumitomo Electric Industries, Ltd. | Cell frame, cell stack, and redox flow battery |
| CN108550885B (en) * | 2018-06-26 | 2024-03-15 | 杭州德海艾科能源科技有限公司 | Electrode frame for all-vanadium redox flow battery |
| CN208889773U (en) * | 2018-09-29 | 2019-05-21 | 中国科学院大连化学物理研究所 | A kind of flow battery electrode frame structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101667646A (en) * | 2008-09-03 | 2010-03-10 | 中国科学院大连化学物理研究所 | Electrode frame structure for redox flow cell |
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Application publication date: 20200407 Assignee: Xinxing Ductile Iron Pipes Co.,Ltd. Assignor: DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES Contract record no.: X2023210000177 Denomination of invention: An electrode frame for all vanadium flow batteries and its application Granted publication date: 20230707 License type: Common License Record date: 20231116 |
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