CN117393810B - Method for recovering capacity of vanadium battery on line and inhibiting diffusion of vanadium ion across membrane on line - Google Patents
Method for recovering capacity of vanadium battery on line and inhibiting diffusion of vanadium ion across membrane on line Download PDFInfo
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- CN117393810B CN117393810B CN202311694682.6A CN202311694682A CN117393810B CN 117393810 B CN117393810 B CN 117393810B CN 202311694682 A CN202311694682 A CN 202311694682A CN 117393810 B CN117393810 B CN 117393810B
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- 229910001456 vanadium ion Inorganic materials 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 44
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000009792 diffusion process Methods 0.000 title claims abstract description 32
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 14
- 239000012528 membrane Substances 0.000 title claims abstract description 13
- 239000003792 electrolyte Substances 0.000 claims abstract description 120
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 230000005012 migration Effects 0.000 claims abstract description 9
- 238000013508 migration Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 46
- 238000005086 pumping Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 238000004448 titration Methods 0.000 claims description 4
- 238000003928 amperometric titration Methods 0.000 claims description 2
- 238000003918 potentiometric titration Methods 0.000 claims description 2
- 238000002798 spectrophotometry method Methods 0.000 claims description 2
- 238000004146 energy storage Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 6
- 230000002238 attenuated effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003014 ion exchange membrane Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04791—Concentration; Density
- H01M8/0482—Concentration; Density of the electrolyte
-
- 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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04432—Pressure differences, e.g. between anode and cathode
-
- 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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0444—Concentration; Density
- H01M8/04477—Concentration; Density of the electrolyte
-
- 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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
Abstract
The invention relates to the technical field of charge and discharge batteries for energy storage, in particular to a method for recovering capacity on line and inhibiting diffusion of vanadium ions across membranes of a vanadium battery on line, which solves the problems of high cost and incapability of responding to power grid regulation of the existing capacity recovery method, and comprises the following steps that when the chargeable and dischargeable capacity of the battery is detected to be less than or equal to 90% of the initial capacity of the battery, the concentration of the vanadium ions in positive electrolyte and negative electrolyte is detected on line respectively; if the concentration of vanadium ions in the positive electrolyte is greater than that of vanadium ions in the negative electrolyte, enabling the pump pressure of the positive electrolyte to be greater than that of the negative electrolyte, and slowing down or accelerating the transmembrane migration of vanadium ions in the target valence state by the pressure difference between the positive electrolyte chamber and the negative electrolyte chamber in the cell stack; if the concentration of vanadium ions in the positive electrolyte is less than the concentration of vanadium ions in the negative electrolyte, the pump pressure of the positive electrolyte circulation pump is less than the pump pressure of the negative electrolyte circulation pump, and the pressure difference between the positive electrolyte chamber and the negative electrolyte chamber in the cell stack is used for slowing down or accelerating the trans-membrane migration of vanadium ions in the target valence state.
Description
Technical Field
The invention relates to the technical field of charge and discharge batteries for energy storage, in particular to a method for online capacity recovery and online inhibition of vanadium ion transmembrane diffusion of a vanadium battery applied to an all-vanadium redox flow battery.
Background
Along with the promotion of clean energy such as scene in the power generation share, long-term energy storage needs appear more obvious, and long-term energy storage becomes the necessary choice of realizing high proportion renewable energy power generation grid-connection, and all-vanadium redox flow battery becomes long-term energy storage's preferred route because of its characteristics such as security is high, long service life, dilatation are nimble, resource cyclic utilization.
Various rechargeable batteries have the problem of capacity attenuation due to different reasons after repeated charge and discharge, namely the chargeable and dischargeable capacity is smaller than the design capacity, capacity recovery is an important means for improving the battery performance, and two means for recovering the capacity of the vanadium redox flow battery at present are provided: firstly, mixing a positive electrode solution and a negative electrode solution, and then redistributing the mixed solution into a positive electrode solution tank and a negative electrode solution tank to balance the concentration of vanadium ions in the positive electrode solution and the negative electrode solution, thereby realizing capacity recovery of the all-vanadium redox flow battery; secondly, charging and discharging are carried out by adopting different SOCs and charging and discharging domains;
the two methods have the defects that: the first battery system is complicated in operation, the operation is complicated, shutdown is needed to realize, a large amount of heat is generated in the process, the high-temperature resistant design of the system is needed to be improved, and the 10kW/40kWh system is taken as an example, the electric energy loss is about 30kWh, so that the problems of high effort and high cost exist; the second method for realizing capacity recovery by adopting charge and discharge with different SOCs and charge and discharge domains, although the method can be adjusted on line, the charge and discharge domains used are 20% -30% of theoretical values, and the battery is in a low-utilization running state during recovery, and cannot fully respond to the requirements of power grid dispatching or adjustment.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for online capacity recovery of the all-vanadium redox flow battery is provided, and the problems that the existing capacity recovery method of the vanadium battery is complex, high in cost and incapable of fully responding to power grid dispatching adjustment are solved.
The technical scheme adopted for solving the technical problems is as follows: the online capacity recovery method of the vanadium battery comprises the following steps of respectively extracting and detecting the vanadium ion concentration in the positive electrode electrolyte and the negative electrode electrolyte on line when the chargeable and dischargeable capacity of the battery is detected to be less than or equal to 90% of the initial capacity of the battery;
if the vanadium ion concentration in the positive electrolyte is detected to be greater than the vanadium ion concentration in the negative electrolyte, when the charge and discharge cycles are carried out for a plurality of times, the pumping-out pressure of the positive electrolyte circulating pump is greater than the pumping-out pressure of the negative electrolyte circulating pump, and partial vanadium ion transmembrane migration is realized by the pressure difference between the positive electrolyte chamber and the negative electrolyte chamber in the cell stack, so that the vanadium ion concentration in the positive electrolyte tends to be consistent with the vanadium ion concentration in the negative electrolyte;
if the concentration of vanadium ions in the positive electrolyte is detected to be less than the concentration of vanadium ions in the negative electrolyte, when the charge and discharge cycles are carried out for a plurality of times, the pumping pressure of the positive electrolyte circulating pump is less than the pumping pressure of the negative electrolyte circulating pump, and partial vanadium ion transmembrane migration is realized by the pressure difference between the positive electrolyte chamber and the negative electrolyte chamber in the cell stack, so that the concentration of vanadium ions in the negative electrolyte tends to be consistent with the concentration of vanadium ions in the positive electrolyte.
Specifically, the method for detecting the vanadium ion concentration in the positive electrode electrolyte and the negative electrode electrolyte is a redox titration method, a spectrophotometry method, a amperometric titration method or a potentiometric titration method.
Specifically, the motors of the positive electrolyte circulating pump and the negative electrolyte circulating pump use variable frequency motors, and the change of the pumping pressure of the circulating pump is realized by the change of the rotating speed of the motors.
A method for inhibiting the diffusion of vanadium ions in a high-pressure cavity by on-line way for the vanadium cell, which comprises the steps of regulating the pressure of a negative electrode liquid chamber and the pressure of a positive electrode liquid chamber in a cell stack in the process of charging and discharging the cell, so that the negative electrode liquid chamber and the positive electrode liquid chamber have the same or different pressures, inhibiting the diffusion of vanadium ions in a low-pressure cavity to the high-pressure cavity by the high-low pressure difference when the pressures are different,
when the SOC is less than or equal to 50%, the pressure of a negative electrode liquid chamber in the battery stack is more than the pressure of a positive electrode liquid chamber;
when 50% < SOC is less than or equal to 60%, making the pressure of the negative electrode liquid chamber = the pressure of the positive electrode liquid chamber in the stack;
when SOC >60%, the pressure of the negative electrode liquid chamber in the stack is made < the pressure of the positive electrode liquid chamber.
Specifically, the negative electrode liquid chamber pressure is adjusted by adjusting the pumping pressure of the negative electrode electrolyte circulating pump, and the positive electrode liquid chamber pressure is adjusted by adjusting the pumping pressure of the positive electrode electrolyte circulating pump.
Specifically, the motors of the negative electrolyte circulating pump and the positive electrolyte circulating pump use variable frequency motors, and the change of the pumping pressure of the circulating pump is realized by the change of the rotating speed of the motors.
Specifically, the pressure of the negative electrode liquid chamber and the pressure of the positive electrode liquid chamber in the cell stack are regulated in the whole operation process of the vanadium battery.
Specifically, the pressure of a negative electrode liquid chamber and the pressure of a positive electrode liquid chamber in the cell stack are regulated in stages in the operation process of the vanadium redox battery, and one of the stages is continuous charging and discharging for a plurality of times.
The beneficial effects of the invention are as follows: the invention comprises two methods, namely, the method for recovering the capacity of the vanadium battery on line is provided for the capacity attenuation of the vanadium battery, the method for inhibiting the diffusion of vanadium ions across the membrane of the vanadium battery on line is provided for the vanadium battery to prevent the capacity attenuation, and the two methods both use a means for regulating the pressure of a positive electrode liquid chamber and the pressure of a negative electrode liquid chamber in a battery stack; in the method for recovering capacity of the attenuated vanadium battery on line, the vanadium ions in the high-pressure chamber are diffused and migrated to the low-pressure chamber to realize the balance of the vanadium ion amounts in the two chambers; in the method for inhibiting the membrane-crossing diffusion of vanadium ions on line for the unattenuated vanadium cell, the migration and diffusion of more active vanadium ions in the low-pressure chamber are inhibited by the high-pressure chamber; the on-line realization method for recovering and maintaining the capacity is time-saving and labor-saving, low in cost, free from stopping, free from influencing the use of batteries and free from influencing the response requirement on power grid dispatching.
Drawings
Fig. 1 is a schematic diagram of a vanadium battery.
In the figure: 1. positive electrolyte, 2, negative electrolyte, 3, a positive electrolyte circulating pump, 4, a negative electrolyte circulating pump, 5, a positive electrolyte chamber, 6, a negative electrolyte chamber, 7 and an ion exchange membrane.
Detailed Description
The technical features of the present invention will be further illustrated by the following examples in conjunction with the accompanying drawings, but the scope of the present invention is not limited to the following examples.
The method for implementing the online capacity recovery of the vanadium battery by combining the structural schematic diagram of the vanadium battery in fig. 1 comprises the following steps:
example 1:
in a 10kW/40kWh all-vanadium redox flow battery system, when the chargeable and dischargeable capacity of a battery is attenuated to 85% of the initial capacity of the battery, respectively extracting and detecting the vanadium ion concentration in the positive electrode electrolyte 1 and the negative electrode electrolyte 2 by a redox titration method on line, wherein the ratio of the vanadium ion concentration in the positive electrode electrolyte 1 to the vanadium ion concentration in the negative electrode electrolyte 2 is detected to be 1.2:1, adjusting the rotating speeds of variable frequency motors of a positive electrolyte circulating pump 3 and a negative electrolyte circulating pump 4, enabling the pumping pressure of the positive electrolyte circulating pump 3 to be greater than the pumping pressure of the negative electrolyte circulating pump 4, realizing partial vanadium ion transmembrane migration by the pressure difference between a positive electrolyte chamber 5 and a negative electrolyte chamber 6 in a cell stack, wherein a membrane refers to an ion exchange membrane 7 between the positive electrolyte chamber 5 and the negative electrolyte chamber 6, detecting again after 20 charge and discharge cycles, and reducing the concentration ratio of vanadium ions in the positive electrolyte 1 and the negative electrolyte 2 to 1.05:1.
example 2:
in a 10kW/40kWh all-vanadium redox flow battery system, when the chargeable and dischargeable capacity of a battery is attenuated to 90% of the initial capacity of the battery, respectively extracting on line and detecting the vanadium ion concentration in the positive electrode electrolyte 1 and the negative electrode electrolyte 2 still by using a redox titration method, wherein the ratio of the vanadium ion concentration in the positive electrode electrolyte 1 to the vanadium ion concentration in the negative electrode electrolyte 2 is detected to be 1:1.2, adjusting the rotating speeds of variable frequency motors of the positive electrolyte circulating pump 3 and the negative electrolyte circulating pump 4, enabling the pumping pressure of the positive electrolyte circulating pump 3 to be smaller than the pumping pressure of the negative electrolyte circulating pump 4, realizing partial vanadium ion transmembrane migration by the pressure difference between the positive electrolyte chamber 5 and the negative electrolyte chamber 6 in the cell stack, detecting again after 15 times of charge and discharge circulation, and reducing the concentration ratio of vanadium ions in the positive electrolyte 1 and the negative electrolyte 2 to 1:1.04.
the method for implementing the online inhibition of the diffusion of vanadium ions through the membrane by the vanadium cell is implemented by combining with the structural schematic diagram of the vanadium cell in the attached figure 1:
the method for inhibiting the diffusion of vanadium ions across the membrane on line of the vanadium battery is a method for maintaining the capacity on line and simultaneously preventing the capacity from being attenuated on line;
here, first, the diffusion of the di-to pentavalent vanadium ions in the stack will be described in a list,
table 1: diffusion coefficient table of four vanadium ions through certain ion exchange membrane measured in laboratory
| Vanadium ion | Diffusion coefficient/(x 10) -6 cm 2 /min） | Remarks |
| V 2+ | 5.261 | Negative electrode electrolyte |
| V 3+ | 1.933 | Negative electrode electrolyte |
| VO 2+ | 4.095 | Positive electrode electrolyte, tetravalent |
| VO 2 + | 3.538 | Positive electrode electrolyte, pentavalent |
The vanadium ions with large diffusion coefficient values in the table are relatively active and easy to diffuse, and according to the table, when the concentration of the positive electrolyte and the concentration of the negative electrolyte are consistent and the SOC is about 55.6%, the average diffusion coefficient of the vanadium ions in the positive electrolyte and the average diffusion coefficient of the vanadium ions in the negative electrolyte are consistent, and when the SOC is more than 55.6%, the average diffusion coefficient of the vanadium ions in the positive electrolyte is less than the average diffusion coefficient of the vanadium ions in the negative electrolyte; when the SOC is less than 55.6%, the average diffusion coefficient of vanadium ions in the positive electrode electrolyte is greater than the average diffusion coefficient of vanadium ions in the negative electrode electrolyte; considering the error and temperature variation difference of the SOC of the BMS on-line detection, it can be regarded as: the average diffusion coefficient of the two is almost consistent when the SOC is 50% -60%, and when the SOC is more than 60%, the average diffusion coefficient of vanadium ions in the positive electrolyte is less than the average diffusion coefficient of vanadium ions in the negative electrolyte; when SOC <50%, the average diffusion coefficient of vanadium ions in the positive electrode electrolyte is greater than the average diffusion coefficient of vanadium ions in the negative electrode electrolyte.
Example 3:
in a 10kW/40kWh all-vanadium redox flow battery system, the concentration ratio of vanadium ions in the initial configuration positive electrode electrolyte 1 and the negative electrode electrolyte 2 is 1:1, when SOC is equal to or less than 50%, the pressure of the negative electrode liquid chamber 6 in the cell stack is made to be equal to the pressure of the positive electrode liquid chamber 5, when 50% < SOC is equal to or less than 60%, the pressure of the negative electrode liquid chamber 6 in the cell stack is made to be equal to or less than the pressure of the positive electrode liquid chamber 5, and when 60% < SOC, the pressure of the negative electrode liquid chamber 6 in the cell stack is made to be equal to or less than the pressure of the positive electrode liquid chamber 5, and after 20 charge/discharge cycles, the concentration ratio is 1:1, after 40 charge-discharge cycles, the concentration ratio was 1:1.01, the concentration ratio is unchanged, and the capacity is almost unchanged.
The negative electrode liquid chamber 6 pressure is regulated by regulating the negative electrode electrolyte circulating pump 4 pumping pressure, the positive electrode liquid chamber 5 pressure is regulated by regulating the positive electrode electrolyte circulating pump 3 pumping pressure, the motors of the negative electrode electrolyte circulating pump 4 and the positive electrode electrolyte circulating pump 3 use variable frequency motors, and the change of the circulating pump pumping pressure is realized by the change of the motor rotating speed.
The pressure of the negative electrode liquid chamber 6 and the pressure of the positive electrode liquid chamber 5 in the cell stack are regulated in the whole operation process of the vanadium battery, so that the vanadium battery can be always in a high-capacity state.
If the pressure of the negative electrode liquid chamber 6 and the pressure of the positive electrode liquid chamber 5 in the cell stack are regulated in a staged manner in the operation process of the vanadium battery, one of the stages is continuous charging and discharging for a plurality of times, so that the attenuation of the capacity of the vanadium battery can be delayed, and if the attenuation is to be recovered, the online capacity recovery method of the vanadium battery is used for recovering.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (8)
1. A method for recovering capacity of a vanadium battery on line is characterized by comprising the following steps: the method comprises the following steps of respectively extracting and detecting the vanadium ion concentration in the positive electrolyte and the negative electrolyte on line when the chargeable and dischargeable capacity of the battery is detected to be less than or equal to 90% of the initial capacity of the battery;
if the vanadium ion concentration in the positive electrolyte is detected to be greater than the vanadium ion concentration in the negative electrolyte, when the charge and discharge cycles are carried out for a plurality of times, the pumping-out pressure of the positive electrolyte circulating pump is greater than the pumping-out pressure of the negative electrolyte circulating pump, and partial vanadium ion transmembrane migration is realized by the pressure difference between the positive electrolyte chamber and the negative electrolyte chamber in the cell stack, so that the vanadium ion concentration in the positive electrolyte tends to be consistent with the vanadium ion concentration in the negative electrolyte;
if the concentration of vanadium ions in the positive electrolyte is detected to be less than the concentration of vanadium ions in the negative electrolyte, when the charge and discharge cycles are carried out for a plurality of times, the pumping pressure of the positive electrolyte circulating pump is less than the pumping pressure of the negative electrolyte circulating pump, and partial vanadium ion transmembrane migration is realized by the pressure difference between the positive electrolyte chamber and the negative electrolyte chamber in the cell stack, so that the concentration of vanadium ions in the negative electrolyte tends to be consistent with the concentration of vanadium ions in the positive electrolyte.
2. The method for online capacity recovery of the vanadium redox battery according to claim 1, wherein the method comprises the following steps: the method for detecting the vanadium ion concentration in the positive electrode electrolyte and the negative electrode electrolyte is a redox titration method, a spectrophotometry method, a amperometric titration method or a potentiometric titration method.
3. The method for online capacity recovery of the vanadium redox battery according to claim 1, wherein the method comprises the following steps: the motors of the positive electrolyte circulating pump and the negative electrolyte circulating pump use variable frequency motors, and the change of the pumping pressure of the circulating pump is realized by the change of the rotating speed of the motors.
4. A method for inhibiting diffusion of vanadium ions across a membrane of a vanadium battery on line is characterized by comprising the following steps: in the process of charging and discharging the battery, the pressure of a negative electrode liquid chamber and the pressure of a positive electrode liquid chamber in the battery stack are regulated to ensure that the negative electrode liquid chamber and the positive electrode liquid chamber have the same or different pressures, and the high-low pressure difference when the different pressures are used for inhibiting the diffusion of vanadium ions in the low-pressure chamber to the high-pressure chamber,
when the SOC is less than or equal to 50%, the pressure of a negative electrode liquid chamber in the battery stack is more than the pressure of a positive electrode liquid chamber;
when 50% < SOC is less than or equal to 60%, making the pressure of the negative electrode liquid chamber = the pressure of the positive electrode liquid chamber in the stack;
when SOC >60%, the pressure of the negative electrode liquid chamber in the stack is made < the pressure of the positive electrode liquid chamber.
5. The method for inhibiting the diffusion of vanadium ions across a membrane on line of the vanadium battery according to claim 4, which is characterized in that: the negative electrode liquid chamber pressure is adjusted by adjusting the pumping pressure of the negative electrode electrolyte circulating pump, and the positive electrode liquid chamber pressure is adjusted by adjusting the pumping pressure of the positive electrode electrolyte circulating pump.
6. The method for inhibiting the diffusion of vanadium ions across a membrane on line of the vanadium battery according to claim 5, which is characterized in that: the motors of the negative electrolyte circulating pump and the positive electrolyte circulating pump use variable frequency motors, and the change of the pumping pressure of the circulating pump is realized by the change of the rotating speed of the motors.
7. The method for inhibiting the diffusion of vanadium ions across a membrane on line of the vanadium battery according to claim 4, which is characterized in that: and the pressure of a negative electrode liquid chamber and the pressure of a positive electrode liquid chamber in the cell stack are regulated in the whole operation process of the vanadium battery.
8. The method for inhibiting the diffusion of vanadium ions across a membrane on line of the vanadium battery according to claim 4, which is characterized in that: the pressure of a negative electrode liquid chamber and the pressure of a positive electrode liquid chamber in the cell stack are regulated in stages in the operation process of the vanadium battery, and one stage in each stage is a plurality of continuous charging and discharging times.
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| CN114497665A (en) * | 2022-01-17 | 2022-05-13 | 武汉科技大学 | Method for reducing capacity attenuation of vanadium battery |
| CN114094148A (en) * | 2022-01-19 | 2022-02-25 | 杭州德海艾科能源科技有限公司 | Online capacity recovery method for all-vanadium redox flow battery |
| CN114744253A (en) * | 2022-04-01 | 2022-07-12 | 香港科技大学 | Method for inhibiting capacity attenuation and online capacity recovery of all-vanadium redox flow battery |
| CN115394366A (en) * | 2022-09-09 | 2022-11-25 | 香港科技大学 | Design method and application of vanadium battery electrolyte with high capacity retention rate |
| CN115472883A (en) * | 2022-09-09 | 2022-12-13 | 香港科技大学 | Design method and application of all-vanadium redox flow battery electrolyte with high capacity retention rate |
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