CN105742670A - Electrolyte flow homogenizing method for flow battery - Google Patents
Electrolyte flow homogenizing method for flow battery Download PDFInfo
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Abstract
The invention relates to an electrolyte flow homogenizing method for a flow battery. The flow resistance is improved at a positive electrode inlet/outlet of an electrolyte of the flow battery; the flow velocity of the electrolyte which passes through a positive electrode at the positive electrode inlet/outlet is reduced; the flow resistance is reduced at two corners far away from the positive electrode inlet/outlet; and the flow velocity of the electrolyte which passes through the positive electrode in the position far away from the positive electrode inlet/outlet is improved. The flow resistance is improved at a negative electrode inlet/outlet of the electrolyte of the flow battery; the flow velocity of the electrolyte which passes through a negative electrode at the negative electrode inlet/outlet is reduced; the flow resistance is reduced at two corners far away from the negative electrode inlet/outlet; and the flow velocity of the electrolyte which passes through the negative electrode in the position far away from the negative electrode inlet/outlet is improved. In order to improve the overall mass transfer in the battery, the flow resistance is improved at the positive electrode inlet/outlet and the negative electrode inlet/outlet of the battery; the flow velocity of the electrolyte is reduced; the flow resistance is reduced at the two corners; and the flow velocity of the electrolyte is improved, so that the flow of the electrolyte in the battery tends to be homogenized; liquid phase mass transfer enhancement in the battery is achieved; and the battery performance is improved.
Description
Technical field
The method that the present invention relates to a kind of fluid cell electrolyte flowing homogenization, belongs to technical field of energy storage.
Background technology
Inside flow battery, electrolyte forms closed circuit through interior flow field flowing, and inside battery flow field is particularly significant to electrolyte flow distribution.In traditional square diagonal flow flow battery, both positive and negative polarity electrolyte flows into battery through both positive and negative polarity liquid-inlet respectively, then through the electrode in both positive and negative polarity half-cell, after electrode active surface site generation both positive and negative polarity electrochemical reaction, electrolyte flows out from both positive and negative polarity liquid outlet.Electrolyte flow uniformity in runner, directly affects battery inner transmission matter situation, and then affects battery performance.In traditional square diagonal angle flow liquid galvanic battery, electrolyte flows uneven in runner, higher near import and export flowing velocity, and two adjacent corner's flowing velocities are little with importing and exporting, and are easily formed flow dead.This flow field uneven distribution makes inside battery import and export mass transfer relatively strong, and two corner's mass transfers are more weak, cause the concentration polarization that local is bigger, reduce battery overall performance.For this, it is possible to adopt and increase flow resistance at battery import and export, reduce electrolyte flow speed；Reduce flow resistance in two corners, increase the mode of electrolyte flow speed so that electrolyte flowing in battery runner tends to homogenization, mass transfer in liquid phase in strengthening battery, improves battery performance.
Summary of the invention
For achieving the above object, the method for a kind of fluid cell electrolyte flowing homogenization of the present invention, increase flow resistance at fluid cell electrolyte positive pole import and export, reduce the positive pole import and export electrolyte flow speed by positive pole；Reduce flow resistance in two corners imported and exported away from positive pole, improve the electrolyte flow speed passing through positive pole away from positive pole import and export；Increase flow resistance at fluid cell electrolyte negative pole import and export, reduce the negative pole import and export electrolyte flow speed by negative pole；Reduce flow resistance in two corners imported and exported away from negative pole, improve the electrolyte flow speed passing through negative pole away from negative pole import and export.
Described flow battery is square diagonal angle flow liquid galvanic battery, and its positive and negative electrode is square；The electrolyte inlet of its negative or positive electrode and outlet are respectively arranged at two diagonal angles place of square flow battery；The electrolyte inlet of the electrolyte inlet of positive pole and outlet and negative pole and outlet lay respectively at the position place, four angles of square flow battery.
The method increasing positive pole and negative pole import and export flow resistance is reduce the hydrophilic of electrode material near positive pole and negative pole import and export；Reducing the method away from positive pole and two corner's flow resistances of negative pole import and export is improve the hydrophilic of electrode material near two corners away from positive pole and negative pole import and export.
The electrolyte of positive pole is flowed into by positive pole import, is flowed out by positive pole outlet after positive pole, and the electrode material hydrophilic of the positive pole at two diagonal angles place in close positive pole import and positive pole exit is less than the hydrophilic of the electrode material in the middle part of positive pole；Away from the electrode material hydrophilic of positive pole at two diagonal angles place in positive pole import and positive pole exit more than the hydrophilic of the electrode material in the middle part of positive pole；Described two diagonal angles place near positive pole import and positive pole exit and two diagonal angles place away from positive pole import and positive pole exit refer to arbitrary angle of square positive pole for the center of circle, the half of a length of side the shortest in square positive pole for radius, on square positive pole delineation the region residing for quadrant.
The electrolyte of negative pole is flowed into by negative pole import, is flowed out by negative pole outlet after negative pole, and the electrode material hydrophilic of the negative pole at two diagonal angles place in close negative pole import and negative pole exit is less than the hydrophilic of the electrode material in the middle part of negative pole；Away from the electrode material hydrophilic of negative pole at two diagonal angles place in negative pole import and negative pole exit more than the hydrophilic of the electrode material in the middle part of negative pole；Described two diagonal angles place near negative pole import and negative pole exit and two diagonal angles place away from negative pole import and negative pole exit refer to arbitrary angle of square negative pole for the center of circle, the half of a length of side the shortest in square negative pole for radius, on square negative pole delineation the region residing for quadrant.
Beneficial effect of the present invention
The present invention, in order to improve inside battery entirety mass transfer, increases flow resistance at battery plus-negative plate import and export, reduces electrolyte flow rate；Reduce flow resistance in two corners, increase electrolyte flow rate, so that the flowing that electrolyte is in battery tends to homogenization, it is achieved mass transfer in liquid phase strengthening in battery, the effect that battery performance improves.
Accompanying drawing explanation
The hydropathy profile of electrode in Fig. 1 square diagonal angle flow liquid galvanic battery；
Wherein 1-electrolyte inlet, 2-hydrophilic is the region of a, and 3-hydrophilic is the region of b, and 4-hydrophilic is the region of c, 5-electrolyte outlet.
Detailed description of the invention
For electrode shape for foursquare square flow battery, wherein the electrolyte of positive pole is flowed into by positive pole import, flowed out by positive pole outlet after positive pole, electrode material hydrophilic near positive pole import and the positive pole at two diagonal angles place in positive pole exit is a, less than the hydrophilic b of the electrode material in the middle part of positive pole；Electrode material hydrophilic away from the positive pole at two diagonal angles place in positive pole import and positive pole exit is c, more than the hydrophilic b (a <b < c) of the electrode material in the middle part of positive pole.At identical conditions, electric current density is 80mA/cm-2Time, its voltage efficiency adopts identical hydrophilic square flow battery high by 0.95% than both positive and negative polarity electrode, and electric current density is more high, improves effect and becomes apparent from.
Claims (5)
1. the method for a fluid cell electrolyte flowing homogenization, it is characterised in that: increase flow resistance at fluid cell electrolyte positive pole import and export, reduce the positive pole import and export electrolyte flow speed by positive pole；Reduce flow resistance in two corners imported and exported away from positive pole, improve the electrolyte flow speed passing through positive pole away from positive pole import and export；Increase flow resistance at fluid cell electrolyte negative pole import and export, reduce the negative pole import and export electrolyte flow speed by negative pole；Reduce flow resistance in two corners imported and exported away from negative pole, improve the electrolyte flow speed passing through negative pole away from negative pole import and export.
2. method according to claim 1, it is characterised in that: described flow battery is square diagonal angle flow liquid galvanic battery, and its positive and negative electrode is square；The electrolyte inlet of its negative or positive electrode and outlet are respectively arranged at two diagonal angles place of square flow battery；The electrolyte inlet of the electrolyte inlet of positive pole and outlet and negative pole and outlet lay respectively at the position place, four angles of square flow battery.
3. method according to claim 1 and 2, it is characterised in that: the method increasing positive pole and negative pole import and export flow resistance is reduce the hydrophilic of electrode material near positive pole and negative pole import and export；Reducing the method away from positive pole and two corner's flow resistances of negative pole import and export is improve the hydrophilic of electrode material near two corners away from positive pole and negative pole import and export.
4. method according to claim 3, it is characterized in that: the electrolyte of positive pole is flowed into by positive pole import, being flowed out by positive pole outlet after positive pole, the electrode material hydrophilic of the positive pole at two diagonal angles place in close positive pole import and positive pole exit is less than the hydrophilic of the electrode material in the middle part of positive pole；Away from the electrode material hydrophilic of positive pole at two diagonal angles place in positive pole import and positive pole exit more than the hydrophilic of the electrode material in the middle part of positive pole；Described two diagonal angles place near positive pole import and positive pole exit and two diagonal angles place away from positive pole import and positive pole exit refer to arbitrary angle of square positive pole for the center of circle, the half of a length of side the shortest in square positive pole for radius, on square positive pole delineation the region residing for quadrant.
5. method according to claim 3, it is characterized in that: the electrolyte of negative pole is flowed into by negative pole import, being flowed out by negative pole outlet after negative pole, the electrode material hydrophilic of the negative pole at two diagonal angles place in close negative pole import and negative pole exit is less than the hydrophilic of the electrode material in the middle part of negative pole；Away from the electrode material hydrophilic of negative pole at two diagonal angles place in negative pole import and negative pole exit more than the hydrophilic of the electrode material in the middle part of negative pole；Described two diagonal angles place near negative pole import and negative pole exit and two diagonal angles place away from negative pole import and negative pole exit refer to arbitrary angle of square negative pole for the center of circle, the half of a length of side the shortest in square negative pole for radius, on square negative pole delineation the region residing for quadrant.
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| CN201410748846.3A CN105742670B (en) | 2014-12-09 | 2014-12-09 | A kind of method of fluid cell electrolyte flowing homogenization |
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| CN201410748846.3A CN105742670B (en) | 2014-12-09 | 2014-12-09 | A kind of method of fluid cell electrolyte flowing homogenization |
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| CN105742670A true CN105742670A (en) | 2016-07-06 |
| CN105742670B CN105742670B (en) | 2018-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963965A (en) * | 2016-10-18 | 2019-07-02 | 洛克希德马丁能源有限责任公司 | Flow battery and its production method with the different electrode of hydrophily on opposing sides |
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| CN101841050A (en) * | 2010-05-31 | 2010-09-22 | 青岛武晓集团有限公司 | Novel flow frame device for all vanadium ion redox flow battery |
| CN102969517A (en) * | 2012-12-10 | 2013-03-13 | 贵州省岑巩县银峰矿业有限公司 | Liquid flow frame device for flow battery and electric pile formed by liquid flow frame device |
| US20130224632A1 (en) * | 2011-07-11 | 2013-08-29 | California Institute Of Technology | Novel separators for electrochemical systems |
| CN103390759A (en) * | 2013-08-13 | 2013-11-13 | 湖南省银峰新能源有限公司 | Liquid flow frame structure for flow cell and electric pile formed by flow cell |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002195336A (en) * | 2000-12-26 | 2002-07-10 | Kayaba Ind Co Ltd | Valve structure of hydraulic shock absorber |
| CN101841050A (en) * | 2010-05-31 | 2010-09-22 | 青岛武晓集团有限公司 | Novel flow frame device for all vanadium ion redox flow battery |
| US20130224632A1 (en) * | 2011-07-11 | 2013-08-29 | California Institute Of Technology | Novel separators for electrochemical systems |
| CN102969517A (en) * | 2012-12-10 | 2013-03-13 | 贵州省岑巩县银峰矿业有限公司 | Liquid flow frame device for flow battery and electric pile formed by liquid flow frame device |
| CN103390759A (en) * | 2013-08-13 | 2013-11-13 | 湖南省银峰新能源有限公司 | Liquid flow frame structure for flow cell and electric pile formed by flow cell |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963965A (en) * | 2016-10-18 | 2019-07-02 | 洛克希德马丁能源有限责任公司 | Flow battery and its production method with the different electrode of hydrophily on opposing sides |
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