CN105789665B - A kind of liquid level equilibrium system - Google Patents
A kind of liquid level equilibrium system Download PDFInfo
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- CN105789665B CN105789665B CN201610143478.9A CN201610143478A CN105789665B CN 105789665 B CN105789665 B CN 105789665B CN 201610143478 A CN201610143478 A CN 201610143478A CN 105789665 B CN105789665 B CN 105789665B
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- liquid level
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- flow
- circulation circuit
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- 239000007788 liquid Substances 0.000 title claims abstract description 132
- 239000003792 electrolyte Substances 0.000 claims abstract description 111
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910001456 vanadium ion Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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 discloses a kind of liquid level equilibrium systems, are suitable for all-vanadium flow battery, the all-vanadium flow battery includes: battery pile；Anolyte flow container for storing anode electrolyte, and connects the battery pile to form first circulation circuit；Electrolyte flow container for storing electrolyte liquid, and connects the battery pile to form second circulation circuit, wherein the liquid level equilibrium system includes: detection unit, is separately connected the anolyte flow container and the electrolyte flow container；Adjustment unit is connected on the first circulation circuit and the second circulation circuit；Administrative unit is separately connected the detection unit and the adjustment unit.Above-mentioned technical proposal improves existing flow battery system the utility model has the advantages that being directed to the main reason for causing liquid level difference to change, can not only the fast positive and negative electrolyte tank of quick-recovery liquid level equilibrium state, and structure is simple, at low cost, plant maintenance is convenient and high degree of automation.
Description
Technical field
The present invention relates to flow battery field more particularly to a kind of liquid level equilibrium systems applied to all-vanadium flow battery.
Background technique
All-vanadium flow battery is considered being most appropriate to one of the electrochemical energy storage device of extensive energy storage at present, uses not
Vanadium ion with valence state drives positive and negative anodes electrolyte mutual independent operating inside pile by pump as positive and negative anodes electrolyte.
But in the mutually indepedent operational process of positive and negative anodes electrolyte, because of medium, that is, Du Pont's diaphragm pair of barrier positive and negative anodes electrolyte
Hydrone does not have barrier action, so battery is in the process of running, the pressure change of pile internal diaphragm two sides will lead to battery
Positive and negative anodes electrolyte content will be different after operation a period of time, and this phenomenon is referred to as water transport phenomena.Water transport phenomena exists
Can be always with generation in flow battery system operational process, with the extension of flow battery system runing time, water migration is existing
As that can generate cumulative effect, the liquid level of positive and negative anodes electrolyte tank will appear very large deviation after a period of time, and at this moment system must be right
Positive and negative electrolyte mutually mix and liquid level is made to reach balance again, and battery can just rerun.
Currently, some scholars propose positive and negative anodes electrolyte tank partition to be arranged in centre, and in partition position as one
Through-hole equipped with certain size guarantees that the liquid level of positive and negative anodes electrolyte and temperature keep balancing by through-hole, but this set
The method of through-hole will lead to positive and negative anodes electrolyte and mutually mix and lead to self-discharge of battery, seriously affect battery efficiency.Some researchers
It is proposed solves fluid reservoir liquid fluctuating caused by water migrates, but this by establishing air pressure balance between positive and negative anodes electrolyte tank
Kind method only takes into account influence of the extraneous gas to fluid pressure, causes the main factor of pressure change to pump without considering
It is influenced caused by power is different.Therefore, device used by water migration problem is solved at present there is at high cost, operation again
The problems such as miscellaneous, difficult in maintenance.
Summary of the invention
Aiming at the above problems existing in the prior art, a kind of technical solution of liquid level equilibrium system is now provided, specifically such as
Under:
A kind of liquid level equilibrium system, is suitable for all-vanadium flow battery, and the all-vanadium flow battery includes:
Battery pile；
Anolyte flow container for storing anode electrolyte, and connects the battery pile to form first circulation circuit；
Electrolyte flow container for storing electrolyte liquid, and connects the battery pile to form second circulation circuit,
In, the liquid level equilibrium system includes:
Detection unit is separately connected the anolyte flow container and the electrolyte flow container, for detecting the anode
The liquid level position of electrolyte tank and the electrolyte flow container；
Adjustment unit is connected on the first circulation circuit and the second circulation circuit, described to adjust
The liquid level position of anolyte flow container and the electrolyte flow container；
Administrative unit is separately connected the detection unit and the adjustment unit, to be detected according to the detection unit
The liquid level position of the anolyte flow container and the electrolyte flow container that arrive, Yu Suoshu anolyte flow container and the cathode
The liquid level position difference of electrolyte tank controls the adjustment unit and adjusts the anolyte flow container when being more than a preset upper limit value
And the liquid level position of the electrolyte flow container keeps the liquid level position of the anolyte flow container and the electrolyte flow container poor
It is contracted to be less than or equal to a preset lower limit value.
Preferably, the adjustment unit includes:
First pump, is set on the first circulation circuit, and connect the administrative unit, in the battery pile and
Anode electrolyte is conveyed between the anolyte flow container；
Second pump, is set on the second circulation circuit, and connect the administrative unit, in the battery pile and
Electrolyte liquid is conveyed between the electrolyte flow container.
Preferably, the adjustment unit further include:
First frequency converter is separately connected the administrative unit and first pump, and the administrative unit is by adjusting described
The output power of first pump described in first Frequency Converter Control is to control the speed that first pump conveys the anode electrolyte；
Second frequency converter is separately connected the administrative unit and second pump, and the administrative unit is by adjusting described
The output power of second pump described in second Frequency Converter Control is to control the speed that second pump conveys electrolyte liquid.
Preferably, the detection unit includes:
First liquid level sensor is set in the anolyte flow container, and connects the administrative unit, for detecting
State the liquid level position value of anode electrolyte in anolyte flow container；
Second liquid level sensor is set in the electrolyte flow container, and connects the administrative unit, for detecting
State the liquid level position value of electrolyte liquid in electrolyte flow container.
Preferably, the detection unit further include:
First pressure, flow sensor are set on the first circulation circuit, and connect the administrative unit, are used for
Detection enters the flow value of the anode electrolyte of the battery pile；
Second pressure, flow sensor are set on the second circulation circuit, and connect the administrative unit, are used for
Detection enters the flow value of the electrolyte liquid of the battery pile.
Preferably, the administrative unit includes:
First comparison module connects first liquid level sensor and second liquid level sensor, and being used for will be according to institute
It states the liquid level position value that the first liquid level sensor and second liquid level sensor measure and obtains liquid level position difference；
Second comparison module connects first comparing unit, to by the liquid level position difference and the upper limit value
And the lower limit value is compared, and obtains comparison result.
Preferably, the first pressure, flow sensor are set to the inlet of the battery pile.
Preferably, the second pressure, flow sensor are set to the inlet of the battery pile.
Preferably, first liquid level sensor is set to the anolyte flow container close to the position of top of the tank.
Preferably, second liquid level sensor is set to the electrolyte flow container close to the position of top of the tank.
Above-mentioned technical proposal the utility model has the advantages that provide a kind of liquid level equilibrium system, it is main for causing liquid level difference to change
Reason improves existing flow battery system, can not only the fast positive and negative electrolyte tank of quick-recovery liquid level equilibrium state, and
And structure is simple, at low cost, plant maintenance facilitates and high degree of automation.
Detailed description of the invention
Fig. 1 is a kind of liquid level equilibrium system structure diagram in preferred embodiment of the invention.
In attached drawing: 1. liquid level equilibrium systems；2. detection unit；21. the first liquid level sensor；22. the second liquid level sensor；
23. first pressure, flow sensor；24. second pressure, flow sensor；3. adjustment unit；31. the first pump；32. first becomes
Frequency device；33. the second pump；34. the second frequency converter；4. administrative unit；41. the first comparison module；42. the second comparison module
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
In preferred embodiment of the invention, it is based on the above-mentioned problems in the prior art, a kind of liquid level equilibrium is provided
System 1, is suitable for all-vanadium flow battery, and all-vanadium flow battery includes:
Battery pile；
Anolyte flow container for storing anode electrolyte, and connects battery pile to form first circulation circuit；
Electrolyte flow container for storing electrolyte liquid, and connects battery pile to form second circulation circuit, structure
As shown in Figure 1, liquid level equilibrium system 1 includes:
Detection unit 2 is separately connected anolyte flow container and electrolyte flow container, for detecting anolyte flow container and bearing
The liquid level position of pole electrolyte tank；
Adjustment unit 3 is connected on first circulation circuit and second circulation circuit, to adjust anolyte flow container
And the liquid level position of electrolyte flow container；
Administrative unit 4 is separately connected detection unit 2 and adjustment unit 3, to the anode detected according to detection unit 2
The liquid level position of electrolyte tank and electrolyte flow container is more than in anolyte flow container and the liquid level position difference of electrolyte flow container
The liquid level position that the adjustment anolyte flow container of adjustment unit 3 and electrolyte flow container are controlled when one preset upper limit value makes positive electricity
The liquid level position difference of solution flow container and electrolyte flow container is contracted to be less than or equal to a preset lower limit value.
Above-mentioned technical proposal passes through liquid level position in 2 real-time detection anolyte flow container of detection unit and electrolyte flow container
It sets, when the difference in anolyte flow container and electrolyte flow container between liquid level position is greater than upper limit value, control unit 4 is recognized
There is deviation for liquid level position, and start adjustment unit 3 to the liquid level position in anolyte flow container and electrolyte flow container into
Row adjustment, until anolyte flow container and the liquid level position difference in electrolyte flow container are restored to lower limit value or following.Wherein
Upper limit value can be set as needed, when upper limit value setting is larger, can be adjusted for biggish liquid level position deviation,
It can be adjusted for small liquid level position fluctuation when upper limit value setting is smaller.Further, lower limit value can also be as needed
Setting, the i.e. tune when anolyte flow container and electrolyte flow container liquid level position difference completely eliminate when lower limit value is set to 0
Whole unit 3 can just stop adjusting.
In preferred embodiment of the invention, adjustment unit 3 includes:
First pump 31, is set on first circulation circuit, and connection management unit 4, in battery pile and anolyte
Anode electrolyte is conveyed between flow container；
Second pump 33, is set on second circulation circuit, and connection management unit 4, in battery pile and electrolyte
Electrolyte liquid is conveyed between flow container.
In preferred embodiment of the invention, adjustment unit 3 further include:
First frequency converter 32 is separately connected administrative unit 4 and the first pump 31, and administrative unit 4 is by adjusting the first frequency converter
The output power of 32 the first pumps 31 of control is to control the speed that the first pump 31 conveys anode electrolyte；
Second frequency converter 34 is separately connected administrative unit 4 and the second pump 33, and administrative unit 4 is by adjusting the second frequency converter
The output power of 34 the second pumps 33 of control is to control the speed that the second pump 33 conveys electrolyte liquid.
In above-mentioned technical proposal, administrative unit 4 by adjusting the first frequency converter 32, the second frequency converter 34 and then can control the
The output power of one the 31, second pump 33 of pump, to realize the adjustment to liquid level position in anolyte flow container and electrolyte flow container,
Such as when anode electrolyte jar liquid surface position is higher, the output power of the second pump 33 can be increased, when the liquid of negative electrode electrolyte tank
When face position is higher, the output power of the first pump 31 can be increased.
In preferred embodiment of the invention, detection unit 2 includes:
First liquid level sensor 21, is set in anolyte flow container, and connection management unit 4, for detecting positive electricity
Solve the liquid level position value of anode electrolyte in flow container；
Second liquid level sensor 22, is set in electrolyte flow container, and connection management unit 4, for detecting negative electricity
Solve the liquid level position value of electrolyte liquid in flow container.
In preferred embodiment of the invention, detection unit 2 further include:
First pressure, flow sensor 23, are set on first circulation circuit, and connection management unit 4, for detect into
The flow value for entering the anode electrolyte of battery pile indicates first by calculating the flow value of anode electrolyte in certain period of time
The speed of pump conveying anode electrolyte；
Second pressure, flow sensor 24, are set on second circulation circuit, and connection management unit 4, for detect into
The flow value for entering the electrolyte liquid of battery pile indicates second by calculating the flow value of electrolyte liquid in certain period of time
The speed of pump conveying electrolyte liquid.
In above-mentioned technical proposal, it can be counted by first pressure, flow sensor 23 and second pressure, flow sensor 24
The flow for calculating electrolyte in first circulation circuit and second circulation circuit in the unit time, follow administrative unit 4 can according to first
The flow of electrolyte and pressure adjust the work of the first frequency converter 32 and the second frequency converter 34 in loop back path and second circulation circuit
Make parameter.
In preferred embodiment of the invention, administrative unit 4 includes:
First comparison module 41 connects the first liquid level sensor 21 and the second liquid level sensor 22, and being used for will be according to first
The liquid level position value that liquid level sensor 21 and the second liquid level sensor 22 measure obtains liquid level position difference；
Second comparison module 42 connects the first comparing unit 41, to by liquid level position difference and upper limit value and lower limit value
It is compared, and obtains comparison result.
In preferred embodiment of the invention, first pressure, flow sensor 23 are set to the inlet of battery pile, are convenient for
Measure the flow value into the anode electrolyte of battery pile.
In preferred embodiment of the invention, second pressure, flow sensor 24 are set to the inlet of battery pile, are convenient for
Measure the flow value into the electrolyte liquid of battery pile.
In preferred embodiment of the invention, the first liquid level sensor 21 is set to anolyte flow container close to top of the tank
Position, convenient for measurement anolyte flow container in anode electrolyte liquid level position value.
In preferred embodiment of the invention, the second liquid level sensor 22 is set to electrolyte flow container close to top of the tank
Position, convenient for measurement electrolyte flow container in electrolyte liquid liquid level position value.
For techniques described above scheme is applied in the all-vanadium flow battery that flow battery is 20kw/40kwh,
In, positive and negative anodes electrolyte tank is the cylindrical-shaped structure that diameter is 3m and height is 3.3m, and positive and negative anodes electrolyte tank fills electrolysis
Liquid product is 1.5m3, keep the liquid level position of anolyte flow container equal with the liquid level position of electrolyte flow container, to being not provided with
The flow battery of liquid level equilibrium system carries out charge and discharge cycles test, after flow battery is run charge and discharge 4 hours, anolyte
There is the deviation of 5cm in the liquid level position of flow container and the liquid level position of electrolyte flow container.Using the flow battery of identical parameters,
And the liquid level equilibrium system in above-mentioned technical proposal is set, on the basis of the work of liquid level equilibrium system, flow battery is carried out
Charge and discharge in 10 hours cannot detect that significant liquid level position is poor, it can be seen that the liquid level equilibrium system in above-mentioned technical proposal can
Effectively eliminate the liquid level position deviation in anolyte flow container and electrolyte flow container.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (8)
1. a kind of liquid level equilibrium system, is suitable for all-vanadium flow battery, the all-vanadium flow battery includes:
Battery pile；
Anolyte flow container for storing anode electrolyte, and connects the battery pile to form first circulation circuit；
Electrolyte flow container for storing electrolyte liquid, and connects the battery pile to form second circulation circuit, feature
It is, the liquid level equilibrium system includes:
Detection unit is separately connected the anolyte flow container and the electrolyte flow container, for detecting the anolyte
The liquid level position of flow container and the electrolyte flow container；
Adjustment unit is connected on the first circulation circuit and the second circulation circuit, to adjust the anode
The liquid level position of electrolyte tank and the electrolyte flow container；
Administrative unit is separately connected the detection unit and the adjustment unit, to what is detected according to the detection unit
The liquid level position of the anolyte flow container and the electrolyte flow container, Yu Suoshu anolyte flow container and the electrolyte
The liquid level position difference of flow container controls the adjustment unit and adjusts the anolyte flow container and institute when being more than a preset upper limit value
The liquid level position for stating electrolyte flow container reduces the liquid level position difference of the anolyte flow container and the electrolyte flow container
To less than it is equal to a preset lower limit value；
The adjustment unit includes:
First pump, is set on the first circulation circuit, and connect the administrative unit, in the battery pile and described
Anode electrolyte is conveyed between anolyte flow container；
Second pump, is set on the second circulation circuit, and connect the administrative unit, in the battery pile and described
Electrolyte liquid is conveyed between electrolyte flow container；
First frequency converter is separately connected the administrative unit and first pump, and the administrative unit is by adjusting described first
The output power of first pump described in Frequency Converter Control is to control the speed that first pump conveys the anode electrolyte；
Second frequency converter is separately connected the administrative unit and second pump, and the administrative unit is by adjusting described second
The output power of second pump described in Frequency Converter Control is to control the speed that second pump conveys electrolyte liquid.
2. liquid level equilibrium system as described in claim 1, which is characterized in that the detection unit includes:
First liquid level sensor is set in the anolyte flow container, and connects the administrative unit, for detect it is described just
The liquid level position value of anode electrolyte in the electrolyte tank of pole；
Second liquid level sensor is set in the electrolyte flow container, and connects the administrative unit, described negative for detecting
The liquid level position value of electrolyte liquid in the electrolyte tank of pole.
3. liquid level equilibrium system as claimed in claim 2, which is characterized in that the detection unit further include:
First pressure, flow sensor are set on the first circulation circuit, and connect the administrative unit, for detecting
Into the flow value of the anode electrolyte of the battery pile；
Second pressure, flow sensor are set on the second circulation circuit, and connect the administrative unit, for detecting
Into the flow value of the electrolyte liquid of the battery pile.
4. liquid level equilibrium system as claimed in claim 3, which is characterized in that the administrative unit includes:
First comparison module connects first liquid level sensor and second liquid level sensor, for will be according to described the
The liquid level position value that one liquid level sensor and second liquid level sensor measure obtains liquid level position difference；
Second comparison module connects first comparing unit, to by the liquid level position difference and the upper limit value and institute
It states lower limit value to be compared, and obtains comparison result.
5. liquid level equilibrium system as claimed in claim 3, which is characterized in that the first pressure, flow sensor are set to
The inlet of the battery pile.
6. liquid level equilibrium system as claimed in claim 3, which is characterized in that the second pressure, flow sensor are set to
The inlet of the battery pile.
7. liquid level equilibrium system as claimed in claim 2, which is characterized in that first liquid level sensor be set to it is described just
Pole electrolyte tank is close to the position of top of the tank.
8. liquid level equilibrium system as claimed in claim 2, which is characterized in that second liquid level sensor is set to described negative
Pole electrolyte tank is close to the position of top of the tank.
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| CN201610143478.9A CN105789665B (en) | 2016-03-14 | 2016-03-14 | A kind of liquid level equilibrium system |
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| CN201610143478.9A CN105789665B (en) | 2016-03-14 | 2016-03-14 | A kind of liquid level equilibrium system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102081768B1 (en) * | 2016-10-13 | 2020-04-23 | 주식회사 엘지화학 | Electrolyte reservoir for redox flow batteries and vanadium redox flow batteries comprising the same |
| CN106910918A (en) * | 2017-03-31 | 2017-06-30 | 湖南省德沃普储能有限公司 | Flow battery energy storage mixes liquid system and its control method |
| CN109546183B (en) * | 2018-11-26 | 2021-07-20 | 上海电气集团股份有限公司 | Leveling blending system and method for positive and negative electrolytes of all-vanadium redox flow battery |
| CN109652814B (en) * | 2018-12-31 | 2023-05-09 | 中国能源建设集团华东电力试验研究院有限公司 | Electrolyte liquid level deviation eliminating system of hydrogen-oxygen separator of hydrogen production machine and control method |
| CN114024002A (en) * | 2021-10-20 | 2022-02-08 | 北京和瑞储能科技有限公司 | Automatic liquid level balancing device and flow battery system |
| CN114122536B (en) * | 2021-10-27 | 2024-02-09 | 北京和瑞储能科技有限公司 | Battery pack performance testing device |
| CN114217228B (en) * | 2021-12-07 | 2022-11-25 | 深圳品驾智能科技有限公司 | Detection structure for power battery pack |
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Effective date of registration: 20231211 Address after: No. 8 Qianchuan Road, Chaohu Economic Development Zone, Hefei City, Anhui Province, 238014 Patentee after: Shanghai Electric (Anhui) energy storage technology Co.,Ltd. Address before: 30F, No.8 Xingyi Road, Changning District, Shanghai 200050 Patentee before: Shanghai Electric Group Co.,Ltd. |