CN113036196A - General device for reducing electrolyte migration of flow battery - Google Patents
General device for reducing electrolyte migration of flow battery Download PDFInfo
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- CN113036196A CN113036196A CN201911250043.4A CN201911250043A CN113036196A CN 113036196 A CN113036196 A CN 113036196A CN 201911250043 A CN201911250043 A CN 201911250043A CN 113036196 A CN113036196 A CN 113036196A
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- electrolyte
- storage tank
- pressure
- flow battery
- pipeline
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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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- 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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
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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 field of flow battery application and energy recovery, in particular to a device for reducing electrolyte migration of a flow battery, and solves the problems of electrolyte migration, capacity attenuation and the like of the conventional flow battery. The device makes the pressure in the storage tanks at two sides different through adjusting the pressure in the electrolyte storage tanks at two sides of the positive electrode and the negative electrode, and reduces the migration of the electrolyte of the flow battery through pressure difference in a physical mode. The invention reduces the migration of the electrolyte of the flow battery by adjusting the pressure in the electrolyte storage tanks at the two sides of the anode and the cathode, and simultaneously can solve the problems of capacity attenuation and the like caused by the migration of the electrolyte, thereby realizing the long-term operation of the battery and the efficient utilization of the electrolyte. The method has the advantages of simple process, simple and convenient operation, no need of using any additional chemicals, low cost and obvious effect.
Description
Technical Field
The invention relates to the field of flow battery application and energy recovery, in particular to a device for reducing electrolyte migration of a flow battery.
Background
The flow battery is a novel energy storage system, and compared with the traditional energy storage mode, the flow battery has the advantages of high energy conversion efficiency, flexible system design, large electric storage capacity, free site selection, deep discharge, safety, environmental protection, low maintenance cost and the like, can be widely applied to the aspects of power generation and energy storage of renewable energy sources such as wind energy, solar energy and the like, peak clipping and valley filling of emergency power supply systems, standby power stations and power systems and the like, and has outstanding advantages in the aspect of energy storage, particularly in the aspect of fixed storage of the renewable energy sources. The electrolyte of the positive electrode and the negative electrode of the battery is an important component in the flow energy storage battery, and plays the roles of storing energy, conducting a circuit and converting electric energy into chemical energy. The concentration of active substances in the electrolyte, the conductivity of the electrolyte and the like directly influence the charge-discharge capacity and the battery performance of the battery; therefore, the electrolyte is required to have higher active material concentration and conductivity, and also to have better chemical stability and lower cost.
Electrolyte migration reasons of different flow battery systems are different, for example, migration rates of vanadium ions with different valence states in the all-vanadium flow battery are different, and due to different numbers of hydrated ions carried by the vanadium ions with different valence states, valence states of positive and negative electrolytes are unbalanced in a long-term operation process, and meanwhile, a small amount of electrolytes migrate. The system can inhibit the water migration to a great extent as long as the migration of vanadium ions is controlled. There are therefore different types of additives or inhibitors added to all vanadium flow batteries to inhibit the migration of vanadium ions. The diaphragm used by the alkaline zinc-iron flow battery can effectively prevent the migration of active substances, does not have the mutual connection of the active substances, and only has the obvious water migration phenomenon. Therefore, the reasons for water migration of flow batteries of different systems are different, and the solutions to be provided are different. If a general method for reducing the migration of the flow battery can be found, the method has an important influence on the field of the electrolyte of the flow battery.
The invention aims to develop a universal device for reducing the migration of the flow battery, which reduces the migration of the electrolyte of the flow battery through a physical mode by adjusting the pressure in electrolyte storage tanks on two sides of a positive electrode and a negative electrode to ensure that the pressures in the electrolyte storage tanks on the two sides are different.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a device for reducing electrolyte migration of a flow battery, which solves the problem of capacity fading caused by the electrolyte migration, and realizes long-term operation of the battery and efficient utilization of the electrolyte.
The technical scheme of the invention is as follows:
a device for reducing the electrolyte migration of a flow battery,
the device comprises a flow battery (1), positive and negative electrolyte drivers (2 and 2 '), a pipeline (3), and closed positive and negative electrolyte storage tanks (4 and 4');
the positive electrolyte driver (2) sends the electrolyte to the positive cavity of the flow battery (1) from the positive electrolyte storage tank (4) through a pipeline, and then returns to the positive electrolyte storage tank (4) through the pipeline to finish the circulation process of the positive electrolyte;
the negative electrolyte driver (2 ') sends the electrolyte to a negative cavity of the flow battery (1) from the negative electrolyte storage tank (4 ') through a pipeline, and then returns to the negative electrolyte storage tank (4 ') through the pipeline, so that the circulation process of the negative electrolyte is completed;
a first gas pressure regulator (9), a first pressure release valve (7) and a first pressure display (6) are arranged at the top of the closed anode electrolyte storage tank (4), and the first gas pressure regulator (9) is communicated with the interior of the anode electrolyte storage tank (4) through a pipeline switch regulator (8); the first pressure release valve (7) is communicated with the storage tank through a pipeline and used for regulating and controlling the pressure of the inner top end of the positive electrolyte storage tank (4), and the first pressure display (6) is communicated with the storage tank through a pipeline and used for displaying the pressure of the inner top end of the positive electrolyte storage tank (4);
and/or a second gas pressure regulator (9 '), a second pressure relief valve (7 ') and a second pressure display (6 ') are arranged at the top of the closed negative electrolyte storage tank (4 '), and the second gas pressure regulator (9 ') is communicated with the inside of the negative electrolyte storage tank (4 ') through a second pipeline switching regulator (8 '); the second pressure release valve (7 ') is communicated with the storage tank through a pipeline and used for regulating and controlling the pressure of the inner top end of the negative electrolyte storage tank (4'), and the second pressure display (6 ') is communicated with the storage tank through a pipeline and used for displaying the pressure of the inner top end of the negative electrolyte storage tank (4').
The gas pressure regulator is one of an evacuable device or a container filled with compressed gas.
The top of electrolyte storage tank is equipped with the filling opening, and filling opening department is equipped with the sealed lid of storage tank.
The pressure display is one or two of a mechanical pressure gauge and a digital pressure gauge.
The vacuum pumping device is one of a vacuum pump and a vacuum machine, and the container filled with compressed gas is one of a spherical tank, a horizontal tank and a steel cylinder.
The gas medium stored in the compressed gas storage device is one of argon, nitrogen and air.
The electrolyte driver is one of a vane pump, a displacement pump and an electromagnetic pump.
The invention has the advantages that:
the invention reduces the migration of the electrolyte of the flow battery by adjusting the pressure in the electrolyte storage tanks at the two sides of the anode and the cathode, and simultaneously can solve the problems of capacity attenuation and the like caused by the migration of the electrolyte, thereby realizing the long-term operation of the battery and the efficient utilization of the electrolyte. The method has the advantages of simple process, simple and convenient operation, no need of using any additional chemicals, low cost and obvious effect. Meanwhile, the method does not produce side effects on the battery, and is suitable for industrial production and control.
Drawings
Fig. 1 is a schematic structural diagram of the present invention, wherein: 1 flow cell, 2 and 2 ' electrolyte drivers, 3 lines, 4 and 4 ' electrolyte reservoirs, 5 and 5 ' reservoir seal caps, 6 and 6 ' pressure indicators, 7 and 7 ' pressure relief valves, 8 and 8 ' line on-off regulators, 9 and 9 ' gas pressure regulators.
The specific implementation mode is as follows:
a device for reducing electrolyte migration of a flow battery comprises the flow battery, a variable frequency pump, a pipeline and positive and negative electrolyte storage tanks; the variable frequency pump sends the electrolyte to the flow battery from the electrolyte storage tank through a pipeline and returns to the same electrolyte storage tank through the pipeline to finish the circulation process; the anode and cathode electrolyte storage tanks are respectively provided with an independent nitrogen gas cylinder, a pipeline switching valve, a pressure release valve and a pressure gauge, and the upper part of the electrolyte storage tank is provided with a sealing cover; the nitrogen gas bottle, the pipeline switch valve and the electrolyte storage tank are sequentially communicated through a pipeline; and the pressure gauge and the pressure release valve are respectively communicated with the electrolyte storage tank through pipelines.
Before the battery runs, the positive electrolyte and the negative electrolyte are respectively filled into the electrolyte storage tanks, and then the electrolyte storage tanks are sealed by sealing covers. The pressure difference in the storage tanks on the two sides of the anode and the cathode is adjusted through the nitrogen gas bottle, the pressure gauge is tracked in real time, meanwhile, the threshold value of the pressure release valve is set, and when the pressure is increased to the set value, pressure release protection is carried out. The migration of the electrolyte is regulated by the pressure difference in the reservoir.
Comparative example 1
Taking an all-vanadium redox flow battery system as an example, a 10-power-saving stack is assembled, wherein an electrode is a carbon felt, the area of the electrode is 1000cm2, a diaphragm is Nafion115, the volumes of positive and negative electrolyte are respectively 30L, and the volumes of positive and negative storage tanks are respectively 50L. The voltage window of the battery is 10V-15.5V, the electric pile is charged and discharged by 100mA/cm2, after 100 times of circulation, the volume of the positive electrolyte becomes 33L, the volume of the negative electrolyte becomes 27L, and the battery capacity is attenuated by 45%.
Example 1
Taking an all-vanadium redox flow battery system as an example, a 10-power-saving stack is assembled, wherein an electrode is a carbon felt, the area of the electrode is 1000cm2, a diaphragm is Nafion115, the volumes of positive and negative electrolyte are respectively 30L, and the volumes of positive and negative storage tanks are respectively 50L. The pressure in the anode storage tank is increased to 0.12MPa through the gas pressure regulator, the pressure in the cathode storage tank is kept at normal atmospheric pressure, the battery voltage window is 10V-15.5V, the stack is charged and discharged at 100mA/cm2, after 100 times of circulation, the volume of the anode electrolyte is changed into 31L, the volume of the cathode electrolyte is changed into 29L, and the battery capacity is attenuated by 20%.
Example 2
Taking an all-vanadium redox flow battery system as an example, a 10-power-saving stack is assembled, wherein an electrode is a carbon felt, the area of the electrode is 1000cm2, a diaphragm is Nafion115, the volumes of positive and negative electrolyte are respectively 30L, and the volumes of positive and negative storage tanks are respectively 50L. Reducing the pressure in the negative storage tank to 0.8 atmospheric pressure through a gas pressure regulator, maintaining the pressure in the positive storage tank to be normal atmospheric pressure, controlling the cell voltage window to be 10V-15.5V, charging and discharging the cell stack at 100mA/cm2, and after 100 times of circulation, changing the volume of the positive electrolyte to 31.1L, the volume of the negative electrolyte to 28.9L, and the attenuation of the cell capacity to 21%
Comparative example 2
Taking a zinc-iron flow battery system as an example, a 10-power-saving stack is assembled, wherein an electrode is a carbon felt, the area of the electrode is 1000cm2, a diaphragm is a PBI ion exchange membrane, the volumes of positive and negative electrolyte are respectively 30L, and the volumes of positive and negative storage tanks are respectively 60L. The cell stack is charged for 1h at 40mA/cm2, and is discharged for 1h at 40mA/cm2, after 50 times of circulation, the volume of the positive electrolyte becomes 10L, and the volume of the negative electrolyte becomes 50L.
Example 3
Taking a zinc-iron flow battery system as an example, a 10-power-saving stack is assembled, wherein an electrode is a carbon felt, the area of the electrode is 1000cm2, a diaphragm is a PBI ion exchange membrane, the volumes of positive and negative electrolyte are respectively 30L, and the volumes of positive and negative storage tanks are respectively 60L. Increasing the pressure in the negative storage tank to 0.15MPa through a gas pressure regulator, keeping the pressure in the positive storage tank at normal atmospheric pressure, charging the cell stack for 1h at 40mA/cm2, discharging the cell stack for 1h at 40mA/cm2, and circulating for 50 times, wherein the volume of the positive electrolyte is changed to 25L, and the volume of the negative electrolyte is changed to 35L.
Example 4
Taking a zinc-iron flow battery system as an example, a 10-power-saving stack is assembled, wherein an electrode is a carbon felt, the area of the electrode is 1000cm2, a diaphragm is a PBI ion exchange membrane, the volumes of positive and negative electrolyte are respectively 30L, and the volumes of positive and negative storage tanks are respectively 60L. And reducing the pressure in the positive storage tank to 0.5 atmospheric pressure through a gas pressure regulator, keeping the pressure in the negative storage tank at normal atmospheric pressure, charging the cell stack for 1 hour at 40mA/cm2, discharging the cell stack for 1 hour at 40mA/cm2, and circulating for 50 times, wherein the volume of the positive electrolyte is changed to 26L, and the volume of the negative electrolyte is changed to 34L.
Claims (7)
1. A device for reducing the electrolyte migration of a flow battery,
the device comprises a flow battery (1), positive and negative electrolyte drivers (2 and 2 '), a pipeline (3), and closed positive and negative electrolyte storage tanks (4 and 4');
the positive electrolyte driver (2) sends the electrolyte to the positive cavity of the flow battery (1) from the positive electrolyte storage tank (4) through a pipeline, and then returns to the positive electrolyte storage tank (4) through the pipeline to finish the circulation process of the positive electrolyte;
the negative electrolyte driver (2 ') sends the electrolyte to a negative cavity of the flow battery (1) from the negative electrolyte storage tank (4 ') through a pipeline, and then returns to the negative electrolyte storage tank (4 ') through the pipeline, so that the circulation process of the negative electrolyte is completed; the method is characterized in that:
a first gas pressure regulator (9), a first pressure release valve (7) and a first pressure display (6) are arranged at the top of the closed anode electrolyte storage tank (4), and the first gas pressure regulator (9) is communicated with the interior of the anode electrolyte storage tank (4) through a pipeline switch regulator (8); the first pressure release valve (7) is communicated with the storage tank through a pipeline and used for regulating and controlling the pressure of the inner top end of the anode electrolyte storage tank (4), and the first pressure display (6) is communicated with the storage tank through a pipeline and used for displaying the pressure of the inner top end of the anode electrolyte storage tank (4);
and/or a second gas pressure regulator (9 '), a second pressure relief valve (7 ') and a second pressure display (6 ') are arranged at the top of the closed negative electrolyte storage tank (4 '), and the second gas pressure regulator (9 ') is communicated with the inside of the negative electrolyte storage tank (4 ') through a second pipeline switching regulator (8 '); the second pressure release valve (7 ') is communicated with the storage tank through a pipeline and used for regulating and controlling the pressure of the inner top end of the negative electrolyte storage tank (4'), and the second pressure display (6 ') is communicated with the storage tank through a pipeline and used for displaying the pressure of the inner top end of the negative electrolyte storage tank (4').
2. The apparatus for reducing electrolyte migration in a flow battery of claim 1, wherein: the gas pressure regulator is one of an evacuable device or a container filled with compressed gas.
3. The apparatus for reducing electrolyte migration in a flow battery of claim 1, wherein: the top of electrolyte storage tank is equipped with the filling opening, and filling opening department is equipped with the sealed lid of storage tank.
4. The apparatus for reducing electrolyte migration in a flow battery of claim 1, wherein: the pressure display is one or two of a mechanical pressure gauge and a digital pressure gauge.
5. The apparatus for reducing electrolyte migration in a flow battery of claim 2, wherein: wherein the vacuum pumping device is one or more than two of a vacuum pump and a vacuum machine, and the container filled with compressed gas is one or more than two of a spherical tank body, a horizontal tank body and a steel cylinder.
6. The apparatus for reducing electrolyte migration in a flow battery of claim 2 or 5, wherein: the gas medium stored in the compressed gas storage device is one or more than two of argon, nitrogen and air.
7. The apparatus for reducing electrolyte migration in a flow battery of claim 1, wherein: the electrolyte driver is one or more than two of a vane pump, a displacement pump and an electromagnetic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911250043.4A CN113036196A (en) | 2019-12-09 | 2019-12-09 | General device for reducing electrolyte migration of flow battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911250043.4A CN113036196A (en) | 2019-12-09 | 2019-12-09 | General device for reducing electrolyte migration of flow battery |
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| CN113036196A true CN113036196A (en) | 2021-06-25 |
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| CN201911250043.4A Pending CN113036196A (en) | 2019-12-09 | 2019-12-09 | General device for reducing electrolyte migration of flow battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62276762A (en) * | 1986-05-24 | 1987-12-01 | Sumitomo Electric Ind Ltd | Circulating electrolyte type secondary battery |
| CN102244281A (en) * | 2011-05-27 | 2011-11-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for sealing liquid reservoir for liquid flow battery |
| CN106233518A (en) * | 2014-05-14 | 2016-12-14 | 住友电气工业株式会社 | Redox flow batteries |
| CN106537675A (en) * | 2014-07-25 | 2017-03-22 | 住友电气工业株式会社 | Electrolytic solution circulation type battery |
| CN107210474A (en) * | 2015-01-23 | 2017-09-26 | 住友电气工业株式会社 | Redox flow batteries |
-
2019
- 2019-12-09 CN CN201911250043.4A patent/CN113036196A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62276762A (en) * | 1986-05-24 | 1987-12-01 | Sumitomo Electric Ind Ltd | Circulating electrolyte type secondary battery |
| CN102244281A (en) * | 2011-05-27 | 2011-11-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for sealing liquid reservoir for liquid flow battery |
| CN106233518A (en) * | 2014-05-14 | 2016-12-14 | 住友电气工业株式会社 | Redox flow batteries |
| CN106537675A (en) * | 2014-07-25 | 2017-03-22 | 住友电气工业株式会社 | Electrolytic solution circulation type battery |
| CN107210474A (en) * | 2015-01-23 | 2017-09-26 | 住友电气工业株式会社 | Redox flow batteries |
Non-Patent Citations (2)
| Title |
|---|
| BIN LI等: ""Capacity Decay Mechanism of Microporous Separator Based All-Vanadium Redox Flow Batteries and its Recovery"", 《CHEMSUSCHEM》 * |
| BIN LI等: ""Capacity Decay Mechanism of Microporous Separator Based All-Vanadium Redox Flow Batteries and its Recovery"", 《CHEMSUSCHEM》, vol. 7, 29 October 2013 (2013-10-29), pages 577 - 584 * |
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Application publication date: 20210625 |
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