CN103390759B - Liquid flow frame structure for flow cell and electric pile formed by flow cell - Google Patents
Liquid flow frame structure for flow cell and electric pile formed by flow cell Download PDFInfo
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- CN103390759B CN103390759B CN201310350667.XA CN201310350667A CN103390759B CN 103390759 B CN103390759 B CN 103390759B CN 201310350667 A CN201310350667 A CN 201310350667A CN 103390759 B CN103390759 B CN 103390759B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/30—Hydrogen technology
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Abstract
The invention discloses a liquid flow frame structure for a flow cell and an electric pile formed by the flow cell. The liquid flow frame structure comprises a positive pole liquid flow frame and a negative pole liquid flow frame which are in a central symmetry structure and comprise main flow pipes respectively arranged in the liquid flow frames and communicated with an outer liquid storage pot; an inlet of each main flow pipe is a liquid inlet/outlet formed in the surface of the corresponding liquid flow frame; each liquid inlet/outlet is communicated with a distribution runner through a voltage stabilization cavity, a tooth profile current-limiting section and a snakelike runner in sequence, and the distribution runner is communicated with a reaction area. The structure provided by the invention not only solves the technical problem of large voltage difference caused by un-uniform liquid flow among battery cells, enables the voltage difference among the battery cells to be in a small range, greatly improves the stability and the safety of vanadium cells, effectively enhances the impedance of a conductive path of electrolyte, reduces the self discharge of shunt current, prevents the electrolyte from flowing from the side surface of the reaction area, and improves the reaction efficiency of the electrolyte.
Description
Technical field
The present invention relates to flow battery, relate in particular to a kind of liquid flow frame structure of flow battery and the pile of composition thereof.
Background technology
Flow battery, especially vanadium redox battery is (referred to as vanadium cell, VRB), it is a kind of new and effective large capacity energy-storage battery, life-span is long, safe, and successful Demonstration Application is smoothly exported in the electric power of wind energy turbine set at present, following at wide new energy field, for example wind power generation, photovoltaic generation, intelligent grid etc., have wide application space.
For current common bipolar heap formula vanadium cell group, its inner main flow pipeline is the public electrolyte passage being formed by stacking by the liquid inlet and outlet of liquid flow frame, electrolyte enters each battery through main flow pipeline and branch road like this, makes to have ion channel between different batteries.Due to battery series connection, between battery, there is electron channel again.In the time of electron channel and ion channel formation closed-loop path, the electrolyte in branch road, just as conductor, has electric current to pass through.Their existence makes inside battery produce by-pass current
,cause self-discharge of battery, cause battery capacity partial loss.Even also exist in the situation that this electric current external circuit disconnects.Because this electric current is without load, so the performance of battery is produced to significant impact.
The generation of by-pass current is defect and the difficult point in flow battery system, in pile, should be eliminated.The generation of by-pass current also causes other problems: because potential difference between terminal anode and negative electrode is large, have again Direct Electrolysis liquid passage, now can on the two poles of the earth, produce the electrochemical reaction that is different from battery system itself.These reactions occur at high current density place, in the electrode generation oxidation reaction of positive terminal, in the electrode generation reduction reaction of negative pole end.Reactant relates to reactant and the product of inert electrode surface mass, battery system, also has in addition solvent itself that redox reaction occurs.The redox reaction that relates to electrode will cause the corrosion of electrode material, the infringement of electrode.If the redox reaction of by-pass current has related to the solvent of electrochemical system, inorganic system can produce hydrogen and oxygen from water, forms mixed explosion gas.For non-aqueous system, organic solvent decomposes the electrochemical reaction that can pollute battery system itself.
In liquid stream battery stack inside, owing to there is mismachining tolerance and assembling stack position error, therefore, liquid flows at main flow pipeline internal memory in larger flow resistance.Electrolyte, in the time that main flow pipeline enters the branch road of each monocell, wants large apart from speed and the pressure ratio of the near branch road liquid stream of main flow entrance apart from main flow entrance branch road flow stream velocity far away and pressure like this.Like this, liquid between each monocell stream maldistribution, causes between each monocell voltage inhomogeneous, voltage difference between different monomers battery is increased, thereby reduce energy content of battery conversion efficiency.
On the other hand, the electrode of flow battery is a kind of carbon felt of Porous open structure, has larger flow resistance when electrolyte flows through electrode.If now there is gap between liquid flow frame and electrode, electrolyte will flow through from the gap between electrode and liquid flow frame, and common liquid flow frame reaction zone is around without any structure that can stop that electrolyte flows through from electrode side, thus the reaction efficiency of reduction monocell.In order to improve the energy efficiency of flow battery, just need to make the electrode that flows through of electrolyte maximum possible.
Summary of the invention
The present invention provides a kind of liquid flow frame structure of flow battery and the pile of composition thereof for solving above-mentioned defect of the prior art, it makes the impedance of conductive path of electrolyte enough greatly to reduce by-pass current, the each monocell electrolyte of uniform distribution more, thereby raising energy conversion efficiency, extends battery.
The present invention for the adopted technical scheme that achieves the above object is:
A kind of liquid flow frame structure of flow battery, comprise anodal liquid flow frame and negative pole liquid flow frame, this positive pole liquid flow frame and the negative pole liquid flow frame structure that is centrosymmetric, and this positive pole liquid flow frame and negative pole liquid flow frame comprise is respectively located at the main flow pipeline that liquid flow frame is inner and be communicated with outside fluid reservoir, the entrance of this main flow pipeline is the liquid in-out mouth of being located at liquid flow frame surface, this liquid in-out mouth is communicated with distribution runner through pressure stabilizing cavity, profile of tooth restricted section, serpentine flow path successively, and this distribution runner is communicated with reaction zone.
In such scheme, the side near reaction zone in this distribution runner is provided with distribution grid.
In such scheme, the top, both sides of this reaction zone is provided with liquid flow resistance spacer block, and the dual-side of reaction zone arranges flange.
In such scheme, this main flow pipeline is two, and is symmetry status and is arranged at the upper/lower terminal of liquid flow frame.
In such scheme, this serpentine flow path is " bow " type.
In such scheme, this serpentine flow path can be done repeatedly bending.This pressure stabilizing cavity can have multiple difformity.This profile of tooth restricted section can have multiple difformity.This flange can have multiple difformity, and this flange shape is identical or not identical, and spacing is equal or spacing is unequal.
The present invention also provides a kind of flow cell pile that adopts above-mentioned liquid flow frame structure.
The present invention is provided with pressure stabilizing cavity, profile of tooth restricted section and serpentine flow path in the arrival end of liquid flow frame main flow pipeline, and its effect is: pressure stabilizing cavity is stablized the pressure of each monocell entrance; Profile of tooth restricted section and serpentine flow path increase the resistance of branch road liquid runner.Both acting in conjunction results are the length that has increased built-in runner, play specification, the evenly effect of electrolyte, solve between different monomers because of the inhomogeneous technical barrier that causes voltage to have a long way to go of liquid stream, make pressure and flow between each monocell of battery pile even, finally reach electrolyte in uniform distribution main flow pipeline to each monocell.
The present invention is provided with profile of tooth restricted section and serpentine flow path in the arrival end of liquid flow frame main flow pipeline, and its another effect is: thus the impedance of the conductive path of the conductive path increase electrolyte of lengthening electrolyte is to reduce by-pass current, improves battery efficiency.
The present invention is provided with liquid flow resistance spacer block and flange in liquid flow frame reaction zone side top, and its effect is: reduce the gap between liquid flow frame and carbon felt electrode, prevent that electrolyte from flowing through from electrode side, make electrolyte flow through as much as possible electrode side.The energy efficiency that has improved like this monocell in flow battery group, has extended battery.
Brief description of the drawings
Fig. 1 is the Facad structure schematic diagram of flow battery liquid flow frame embodiment mono-of the present invention.
Fig. 2 is the Facad structure schematic diagram of flow battery liquid flow frame embodiment bis-of the present invention.
1. liquid in-out mouths in figure, 2. pressure stabilizing cavity, 3. profile of tooth restricted section, 4. serpentine flow path, 5. liquid flow resistance spacer block, 6. flange, 7. distribution grid, 8. distributes runner, 9. reaction zone.
Embodiment
Below with reference to accompanying drawing, the present invention is carried out to comparatively detailed explanation.
As shown in Figure 1, flow battery liquid flow frame of the present invention comprises anodal liquid flow frame and negative pole liquid flow frame, this positive pole liquid flow frame and the negative pole liquid flow frame structure that is centrosymmetric, and this positive pole liquid flow frame and negative pole liquid flow frame comprise is respectively located at the main flow pipeline that liquid flow frame is inner and be communicated with outside fluid reservoir, the entrance of this main flow pipeline is the liquid in-out mouth 1 of being located at liquid flow frame surface, this liquid in-out mouth 1 is through pressure stabilizing cavity 2, profile of tooth restricted section 3, serpentine flow path 4 and distribute runner 8 to be communicated with, and this distribution runner 8 is communicated with reaction zone 9.The interior side near reaction zone 9 of this distribution runner 8 is provided with distribution grid 7.Two side roof parts of this reaction zone 9 are provided with liquid flow resistance spacer block 5, and the dual-side of reaction zone (9) arranges flange 6.
Fig. 2 is another embodiment of flow battery liquid flow frame of the present invention, and the first example structure that its general configuration and Fig. 1 show is identical, and difference is only that liquid in-out mouth 1 is located at medium position, and serpentine flow path 4 is " bow " type.
Liquid flow frame structure described in employing Fig. 1, Fig. 2, can be made into a kind of novel flow cell pile.
Electrolyte drives from fluid reservoir flows out through pump, when flow through the serpentine flow path 4 of liquid flow frame from liquid in-out mouth 1, first enter serpentine flow path 4 pressure stabilizing cavity 2 above, then enter profile of tooth restricted section 3, after serpentine flow path 4, be subject to the effect of liquid flow resistance spacer block 5 and distribution grid 7, electrolyte enters and distributes runner 8.Electrolyte enters and distributes after runner 8, can all not enter immediately the electrochemical reaction district 9 of battery, but be subject to stopping of distribution grid 7, and part electrolyte can flow into the end that distributes runner 8.Electrolyte is entering before reaction zone 9 like this, and electrolyte can be full of whole distribution runner 8, thereby can make electrolyte in the time entering reaction zone 9, keep even.Electrolyte enters after reaction zone 9 at the uniform velocity equably, on side due to liquid flow frame reaction zone 9, be furnished with flange 6 and prevented that well electrolyte from passing through from liquid flow frame side, therefore when electrolyte is by reaction zone 9, need all through electrode, and then by serpentine flow path 4, profile of tooth restricted section 3, pressure stabilizing cavity 2 enters liquid in-out mouth 1 and flows back to fluid reservoir.
When electrolyte is flowed through the serpentine flow path 4 of liquid flow frame from liquid in-out mouth 1, serpentine flow path 4 pressure stabilizing cavity 2 and profile of tooth restricted section 3 above plays liquid storage, voltage stabilizing and three effects of current limliting, pressure and flowed fluctuation on buffering sprue, electrolyte flow and pressure in the time entering each monocell are consistent, with the liquid stream of the each monocell of uniform distribution.Although now entering the flow velocity of the liquid stream of each monocell is consistent with pressure, will have reaction dead angle and cannot solve the excessive problem of by-pass current if now directly introduce reaction zone 9.And serpentine flow path 4 itself is repeatedly bending (as shown in Figure 1 and Figure 2), on it, also has profile of tooth restricted section 3, in limited liquid flow frame structure, increased as much as possible like this length of runner, thereby the impedance that has effectively increased the conductive path of electrolyte reduces by-pass current.Electrolyte electrolyte after the serpentine flow path 4 lengthening enters and distributes after runner 8, can all not enter immediately the electrochemical reaction district 9 of battery, but be subject to stopping of distribution grid 7, and part electrolyte can flow into the end that distributes runner 8.Electrolyte is entering before reaction zone 9 like this, and electrolyte can be full of whole distribution runner 8, thereby can make electrolyte in the time entering reaction zone 9, keep even.Electrolyte enters after reaction zone 9 at the uniform velocity equably, is furnished with flange 6 and has prevented that well electrolyte from passing through from liquid flow frame side on the side due to liquid flow frame reaction zone 9.
Visible, adopt structure of the present invention not only to solve between monomer because of the inhomogeneous technical barrier that causes voltage to have a long way to go of liquid stream, make voltage difference between cell in very among a small circle, stability and the fail safe of vanadium cell are increased substantially, and the impedance that has effectively increased the conductive path of electrolyte has reduced the self discharge that by-pass current reduces, and prevent that electrolyte from flowing through from the side of reaction zone, improved the reaction efficiency of electrolyte.
Claims (10)
1. the liquid flow frame structure of a flow battery, comprise anodal liquid flow frame and negative pole liquid flow frame, this positive pole liquid flow frame and the negative pole liquid flow frame structure that is centrosymmetric, and this positive pole liquid flow frame and negative pole liquid flow frame comprise is respectively located at the main flow pipeline that liquid flow frame is inner and be communicated with outside fluid reservoir, the entrance of this main flow pipeline is the liquid in-out mouth (1) of being located at liquid flow frame surface, it is characterized in that, this liquid in-out mouth (1) is successively through pressure stabilizing cavity (2), profile of tooth restricted section (3), serpentine flow path (4) is communicated with distributing runner (8), this distribution runner (8) is communicated with reaction zone (9).
2. the liquid flow frame structure of flow battery according to claim 1, is characterized in that, the side near reaction zone (9) in this distribution runner (8) is provided with distribution grid (7).
3. the liquid flow frame structure of flow battery according to claim 1 and 2, is characterized in that, the top, both sides of this reaction zone (9) is provided with liquid flow resistance spacer block (5), and the dual-side of this reaction zone (9) arranges flange (6).
4. the liquid flow frame structure of flow battery according to claim 1 and 2, is characterized in that, this main flow pipeline is two, and is symmetry status and is arranged at the upper/lower terminal of liquid flow frame.
5. the liquid flow frame structure of flow battery according to claim 3, is characterized in that, this main flow pipeline is two, and is symmetry status and is arranged at the upper/lower terminal of liquid flow frame.
6. the liquid flow frame structure of flow battery according to claim 1 and 2, is characterized in that, this serpentine flow path (4) is " bow " type.
7. the liquid flow frame structure of flow battery according to claim 3, is characterized in that, this serpentine flow path (4) is " bow " type.
8. the liquid flow frame structure of flow battery according to claim 4, is characterized in that, this serpentine flow path (4) is " bow " type.
9. the liquid flow frame structure of flow battery according to claim 5, is characterized in that, this serpentine flow path (4) is " bow " type.
10. a flow cell pile, is characterized in that, adopts the liquid flow frame structure described in claim 1-9 in this flow cell pile.
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| CN201310350667.XA CN103390759B (en) | 2013-08-13 | 2013-08-13 | Liquid flow frame structure for flow cell and electric pile formed by flow cell |
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| CN201310350667.XA CN103390759B (en) | 2013-08-13 | 2013-08-13 | Liquid flow frame structure for flow cell and electric pile formed by flow cell |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647090B (en) * | 2013-12-06 | 2016-03-02 | 中国东方电气集团有限公司 | Flow frame component and flow battery |
| CN103647099B (en) * | 2013-12-06 | 2016-03-23 | 中国东方电气集团有限公司 | Flow frame component and flow battery |
| CN103647091B (en) * | 2013-12-06 | 2016-03-02 | 中国东方电气集团有限公司 | Bipolar plate assembly and flow battery |
| CN103682408B (en) * | 2013-12-06 | 2016-08-17 | 中国东方电气集团有限公司 | Flow frame component and flow battery |
| CN105742669B (en) * | 2014-12-09 | 2018-05-18 | 中国科学院大连化学物理研究所 | A kind of homogenization method of fluid cell electrolyte flowing |
| CN105742670B (en) * | 2014-12-09 | 2018-05-18 | 中国科学院大连化学物理研究所 | A kind of method of fluid cell electrolyte flowing homogenization |
| CN109411781A (en) * | 2017-08-18 | 2019-03-01 | 上海电气集团股份有限公司 | Collector plate and pile comprising it |
| CN108172858A (en) * | 2018-01-17 | 2018-06-15 | 福建农林大学 | A kind of flow battery liquid flow frame, monocell and pile |
| CN109411782B (en) * | 2018-12-13 | 2023-09-08 | 中南大学 | Liquid flow frame of all-vanadium redox flow battery |
| CN110247093B (en) * | 2019-06-25 | 2021-06-15 | 西安理工大学 | Preparation method of lead liquid galvanic pile |
| US20210359327A1 (en) * | 2020-05-15 | 2021-11-18 | Ess Tech, Inc. | Redox flow battery and battery system |
| CN112290044B (en) * | 2020-09-21 | 2022-11-22 | 北京和瑞储能科技有限公司 | Negative electrode fluid plate frame for flow battery and battery unit |
| CN114497618B (en) * | 2020-11-12 | 2024-03-26 | 中国科学院大连化学物理研究所 | Zinc bromine single flow battery structure |
| TWI767579B (en) | 2021-02-22 | 2022-06-11 | 財團法人工業技術研究院 | Close-end fuel cell and anode bipolar plate thereof |
| CN113889639B (en) * | 2021-09-02 | 2023-09-15 | 香港科技大学 | High-efficiency rotary leakage current blocker and application thereof |
| CN115441032B (en) * | 2022-09-30 | 2024-01-26 | 湖南省银峰新能源有限公司 | Flow battery and electric pile |
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| CN203367426U (en) * | 2013-08-13 | 2013-12-25 | 湖南省银峰新能源有限公司 | Flow frame structure of flow battery and electric pile comprising flow frame structure |
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| CN101814618B (en) * | 2009-02-23 | 2012-05-30 | 北京金能燃料电池有限公司 | Flow battery |
| AT510723B1 (en) * | 2010-12-21 | 2012-06-15 | Cellstrom Gmbh | FRAME OF A CELL OF A REDOX FLOW BATTERY |
| CN103022542A (en) * | 2012-12-13 | 2013-04-03 | 朝阳华鼎储能技术有限公司 | Liquid flow frame device and vanadium cell containing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203367426U (en) * | 2013-08-13 | 2013-12-25 | 湖南省银峰新能源有限公司 | Flow frame structure of flow battery and electric pile comprising flow frame structure |
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