CN105742669A - Electrolyte flow homogenization method of redox flow battery - Google Patents
Electrolyte flow homogenization method of redox flow battery Download PDFInfo
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Abstract
The invention relates to an electrolyte flow homogenization method of a redox flow battery. The electrolyte flow homogenization method comprises the following steps of increasing flow resistance at an electrolyte positive electrode inlet/outlet of the redox flow battery, and reducing flow speed of the electrolyte passing through a positive electrode at the positive electrode inlet/outlet; reducing flow resistance at two corners far away from the positive electrode inlet/outlet, and increasing the flow speed of the electrolyte passing through the positive electrode at positions far away from the positive electrode inlet/outlet; increasing flow resistance at an electrolyte negative electrode inlet/outlet of the redox flow battery, and reducing flow speed of the electrolyte passing through a negative electrode at the negative electrode inlet/outlet; and reducing flow resistance at two corners far away from the negative electrode inlet/outlet, and increasing flow speed of the electrolyte passing through the negative electrode at positions far away from the negative electrode inlet/outlet. In order to improve the comprehensive mass transfer in the battery, the flow resistance at the positive electrode inlet/outlet and the negative electrode inlet/outlet of the battery is increased, the flow speed of the electrolyte is reduced, the flow resistance at the two corners is reduced, the flow speed of the electrolyte is increased, thus, uniform flow of the electrolyte in the battery is achieved, and the effects of enhancing the liquid phase mass transfer in the battery and improving the battery performance are achieved.
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 present invention proposes the homogenization method of a kind of fluid cell electrolyte flowing, increases flow resistance at fluid cell electrolyte positive pole import and export, reduces 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 flow 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.
Increase positive pole and negative pole import and export flow resistance is reduce the porosity of electrode material near positive pole and negative pole import and export；Reducing by the two corner's flow resistances imported and exported away from positive pole and negative pole is improve the porosity 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 and is flowed out by positive pole outlet after positive pole, and the electrode material porosity of the positive pole at two diagonal angles place in close positive pole import and positive pole exit is less than the porosity of the electrode material in the middle part of positive pole；Away from the electrode material porosity of positive pole at two diagonal angles place in positive pole import and positive pole exit more than the porosity 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 and is flowed out by negative pole outlet after negative pole, and the electrode material porosity of the negative pole at two diagonal angles place in close negative pole import and negative pole exit is less than the porosity of the electrode material in the middle part of negative pole；Away from the electrode material porosity of negative pole at two diagonal angles place in negative pole import and negative pole exit more than the porosity 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
In order to improve inside battery entirety mass transfer, increase flow resistance at battery plus-negative plate import and export, reduce 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 porosity distribution figure of electrode in Fig. 1 square diagonal angle flow liquid galvanic battery；
Wherein 1-electrolyte inlet, 2-porosity is the region of a, and 3-porosity is the region of b, and 4-porosity 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 porosity near positive pole import and the positive pole at two diagonal angles place in positive pole exit is a, less than the porosity b of the electrode material in the middle part of positive pole；Electrode material porosity away from the positive pole at two diagonal angles place in positive pole import and positive pole exit is c, more than the porosity b (a <b < c) of the electrode material in the middle part of positive pole.At identical conditions, electric current density is 100mA/cm-2Time, its voltage efficiency is about higher by 1% than the square flow battery of both positive and negative polarity electrode employing same porosity, and electric current density is more high, improves effect and becomes apparent from.
Claims (5)
1. the homogenization method of a fluid cell electrolyte flowing, 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 flow 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: increase positive pole and negative pole import and export flow resistance is reduce the porosity of electrode material near positive pole and negative pole import and export；Reducing by the two corner's flow resistances imported and exported away from positive pole and negative pole is improve the porosity 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 and flowed out by positive pole outlet after positive pole, and the electrode material porosity of the positive pole at two diagonal angles place in close positive pole import and positive pole exit is less than the porosity of the electrode material in the middle part of positive pole；Away from the electrode material porosity of positive pole at two diagonal angles place in positive pole import and positive pole exit more than the porosity 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 and flowed out by negative pole outlet after negative pole, and the electrode material porosity of the negative pole at two diagonal angles place in close negative pole import and negative pole exit is less than the porosity of the electrode material in the middle part of negative pole；Away from the electrode material porosity of negative pole at two diagonal angles place in negative pole import and negative pole exit more than the porosity 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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| CN201410748016.0A CN105742669B (en) | 2014-12-09 | 2014-12-09 | A kind of homogenization method of fluid cell electrolyte flowing |
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| CN201410748016.0A CN105742669B (en) | 2014-12-09 | 2014-12-09 | A kind of homogenization method of fluid cell electrolyte flowing |
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| CN105742669A true CN105742669A (en) | 2016-07-06 |
| CN105742669B CN105742669B (en) | 2018-05-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006156029A (en) * | 2004-11-26 | 2006-06-15 | Kansai Electric Power Co Inc:The | Carbon electrode material for vanadium redox flow battery |
| 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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2014
- 2014-12-09 CN CN201410748016.0A patent/CN105742669B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006156029A (en) * | 2004-11-26 | 2006-06-15 | Kansai Electric Power Co Inc:The | Carbon electrode material for vanadium redox flow battery |
| 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 |
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