CN111354966A - Energy storage unit of all-vanadium redox flow battery system and method for improving direct-current side voltage of energy storage unit - Google Patents
Energy storage unit of all-vanadium redox flow battery system and method for improving direct-current side voltage of energy storage unit Download PDFInfo
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- CN111354966A CN111354966A CN201811561115.2A CN201811561115A CN111354966A CN 111354966 A CN111354966 A CN 111354966A CN 201811561115 A CN201811561115 A CN 201811561115A CN 111354966 A CN111354966 A CN 111354966A
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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
- H01M8/04298—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
- H01M8/04753—Pressure; Flow of fuel cell reactants
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/249—Grouping of fuel cells, e.g. stacking of fuel cells comprising two or more groupings of fuel cells, e.g. modular assemblies
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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
An energy storage unit of an all-vanadium redox flow battery system and a method for improving the direct-current side voltage of the energy storage unit belong to the field of redox flow batteries and are used for solving the problem of SOC difference among battery modules in the energy storage unit.
Description
Technical Field
The invention belongs to the field of flow batteries, and particularly relates to an energy storage unit of an all-vanadium flow battery system and a method for improving direct-current side voltage of the energy storage unit.
Background
Different application fields have different requirements for the power and the capacity of an energy storage system product, for example, for a household user, in order to meet functional requirements of demand side response, valley power peak use and the like, the power of the energy storage system generally reaches thousands of kilowatts and tens of kilowatts; aiming at a distributed power generation and intelligent microgrid system and industrial and commercial users, the power of an energy storage system generally reaches hundreds of kilowatts and megawatts; aiming at the renewable energy power generation field and the power system peak regulation field, the capacity requirement of the energy storage system is to reach megawatt level and more than hundred megawatt level.
The galvanic pile is a place for realizing the conversion of electric energy and chemical energy by charging and discharging of the all-vanadium redox flow battery system, and is the minimum unit for realizing the charging and discharging of the all-vanadium redox flow battery system. From the current situation of companies for producing and developing all-vanadium flow battery products domestically and internationally, the rated power of a single electric pile is about kilowatt and tens kilowatts, for example, the maximum electric pile produced by the Japanese Sumitomo electrician company reaches 42kW, and the maximum electric pile produced by the large continuous melting energy storage technology development company Limited reaches 33.5 kW. For a battery energy storage system with a larger scale of hundreds kilowatts, megawatts or more, etc., a modular design grouping scheme is generally adopted. For example, the single battery module is formed by electrically connecting the electric piles in series and parallel and sharing a set of electrolyte system (see the detailed schematic diagram 1); the plurality of battery modules are electrically connected in series and parallel and connected with the energy storage converter to form a battery energy storage unit which can be scheduled, so that charging and discharging are realized. (see fig. 2 in detail) a plurality of energy storage units are centrally scheduled by an energy management system to form a megawatt energy storage system. The modular design scheme can meet the requirement of an upper-level energy storage system with megawatt.
The efficiency, reliability and economy of operation of the energy storage unit determine the efficiency, reliability and economy of operation of large-scale energy storage systems. From the viewpoint of improving the operation efficiency and the economy, the direct-current side voltage range of the energy storage unit is not too low. The low voltage on the direct current side will cause the high running current on the alternating current side, the line loss is serious, and the efficiency is adversely affected.
In order to increase the dc-side voltage of the energy storage unit, one measure is to increase the dc-side voltage of a single battery module, and the other measure is to increase the number of series-connected battery modules. For a single battery module, all the electric piles are connected through a common electrolyte pipeline, and the technical characteristic that the electrolyte can conduct electricity enables leakage current to be generated among the electric piles. The leakage current is related to the total dc side voltage of the battery module. However, the larger the number of the electric stacks connected in series, the higher the voltage on the dc side of the battery module, the larger the generated leakage current, and the higher the self-loss of the energy inside the battery module, which adversely affects the energy conversion efficiency. Meanwhile, the local heat release inside the galvanic pile and in the electrolyte pipeline is concentrated due to overlarge leakage current, the failure rate of the galvanic pile and the pipeline system is increased, and the stable and reliable operation of the system is adversely affected. Therefore, the dc side voltage of the battery module should not be excessively high. Through calculation and optimization, the direct-current side voltage of a single all-vanadium redox flow battery module is preferably not higher than 320V.
Another scheme is that the battery modules are connected in series, so that the output voltage of the direct current side of the energy storage unit can be effectively increased. However, in the operation process of the energy storage unit, the electrolyte ionic states of the battery modules are different due to differences among the galvanic pile, the electrolyte flow, the pressure, the temperature and the like used by each battery module, so that the problem of inconsistency of the operation of the battery modules is caused. The difference is mainly expressed as the SOC difference among the battery modules in the energy storage unit. The difference in SOC among the battery modules may adversely affect the overall performance of the energy storage unit. For example, when the SOC difference between the battery modules is large, the energy storage unit may not charge the low SOC battery module when the SOC of the high SOC battery module reaches the upper limit during the charging process. Upon discharge, the low SOC battery module must discharge first to the lowest SOC lower limit, while the high SOC battery module still has some capacity not discharged. The existence of the above-mentioned problems causes the chargeable capacity and the dischargeable capacity of the energy storage unit to show a certain reduction. In addition, when the SOC difference reaches a certain degree, the energy storage unit needs to be shut down for maintenance, which affects the actual utilization rate of the battery energy storage system and is not beneficial to the application of the all-vanadium redox flow battery energy storage system product.
Disclosure of Invention
In view of the problem of SOC difference between battery modules in the energy storage unit in the prior art, an object of the present invention is to provide an energy storage unit capable of effectively solving the above problem: namely, it is
The energy storage unit of the all-vanadium redox flow battery system is provided with n battery modules which are connected in series, each battery module comprises at least one pile group, a positive electrolyte storage tank, a negative electrolyte storage tank and a first electrolyte circulation pipeline for electrolyte transmission, and the battery module MiRespectively from the battery module MiThe corresponding positive/negative electrolyte storage tanks are transported and distributed to the battery module M through the first electrolyte circulation pipelineiAfter each galvanic pile is arranged, electrolyte with the same polarity of each galvanic pile is conveyed to the battery module M consistent with the conveyed electrolyte polarity through the second electrolyte circulation pipelinei+1I is more than or equal to 1 and less than n in the corresponding electrolyte storage tank; if i is equal to n, the battery module MnRespectively from the battery module MnThe corresponding positive/negative electrolyte storage tanks are transported and distributed to the battery module M through the first electrolyte circulation pipelinenAfter each galvanic pile is arranged, electrolyte with the same polarity of each galvanic pile is conveyed to the battery module M consistent with the conveyed electrolyte polarity through the second electrolyte circulation pipeline1The corresponding electrolyte storage tank.
Furthermore, a liquid level detector is respectively configured on the positive/negative electrolyte storage tank of each battery module and used for detecting a liquid level signal in the electrolyte storage tank corresponding to the liquid level detector and feeding the liquid level signal back to the battery management system of the energy storage unit so that the battery management system can adjust the flow of the electrolyte, and the liquid levels of the positive/negative electrolyte storage tanks of each battery module tend to be consistent.
Furthermore, the energy storage unit also comprises a plurality of variable frequency controllers, and the variable frequency controllers are used for adjusting the flow of the positive/negative electrolyte in the battery modules where the variable frequency controllers are located.
Further, the liquid level detector is a liquid level sensor.
Another objective of the present invention is to provide a method for increasing the dc-side voltage of an energy storage unit, which can effectively solve the above problems: namely, a method for improving the direct-current side voltage of an energy storage unit comprises the following steps:
connecting the n battery modules in series;
one of the battery modules MiIs delivered and distributed to the battery module M by the first electrolyte circulation pipelineiEach pile in the electrolyte tank, and a second electrolyte circulation pipeline conveys electrolyte with the same polarity of each pile to a battery module M consistent with the polarity of the conveyed electrolytei+1I is more than or equal to 1 and less than n in the corresponding electrolyte storage tank;
if i equals n, for the battery module MnIs delivered and distributed to the battery module M by the first electrolyte circulation pipelineiEach pile in the electrolyte tank, and a second electrolyte circulation pipeline conveys electrolyte with the same polarity of each pile to a battery module M consistent with the polarity of the conveyed electrolyte1The corresponding electrolyte storage tank.
Furthermore, a liquid level detector is used for detecting a liquid level signal in the electrolyte storage tank corresponding to the liquid level detector, and the liquid level signal is fed back to the battery management system of the energy storage unit so that the battery management system can adjust the flow of the electrolyte, and the liquid levels of the positive/negative electrolyte storage tanks of the battery modules tend to be consistent.
Further, the flow rate of the positive/negative electrolyte in the battery module is adjusted by the variable frequency controller.
Further, the liquid level detector is a liquid level sensor.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a novel battery module series connection mode and a control scheme, which can effectively improve the direct current side voltage of an energy storage unit, improve the output voltage of an alternating current side and reduce the system loss, for example, the output voltage range of the direct current side of the energy storage unit is improved by increasing the series connection quantity of battery modules, and the system requirements of high voltage and low current are met; meanwhile, the problem of difference of charging and discharging states among a plurality of battery modules can be solved relatively thoroughly, so that the overall output performance of the energy storage unit is effectively improved, the frequent maintenance workload of a battery system is reduced, the operation efficiency of the battery energy storage system is improved, the stable reliability of operation is improved, and the product competitiveness of the energy storage technology of the all-vanadium redox flow battery is enhanced; and the maintenance workload of the energy storage system in the operation process is reduced, so that the operation utilization rate of the energy storage system is improved.
Drawings
Fig. 1 is a schematic view of a conventional battery module structure;
FIG. 2 is a schematic diagram of a conventional energy storage unit;
fig. 3 is a schematic structural diagram of the energy storage unit of the present invention.
In the figure: 1. the electrolytic cell comprises an energy storage converter, 2, a galvanic pile, 3, a first electrolyte circulation pipeline, 4, an electrolyte circulation pump, 5, a negative electrolyte storage tank, 6, a positive electrolyte storage tank and 7, a second electrolyte circulation pipeline.
Detailed Description
In order to solve the problem of SOC difference caused by the fact that a plurality of battery modules of an energy storage unit are connected in series, the invention provides a novel battery module series connection scheme and an operation management method thereof. Compared with the existing flow battery composition scheme, the invention has the main characteristics that the operation structure that the electrolytes among the battery modules are independently used is changed, and the electrolytes used by the whole energy storage unit can be shared among the battery modules by adding pipelines on the original electrolyte conveying pipeline, so that the problem of SOC difference among the battery modules is effectively solved. Meanwhile, on the basis of solving the problems, the series connection among a plurality of battery modules in the energy storage unit can be realized, the output voltage of the alternating current side is improved, and the system loss is reduced.
Based on the above description, the energy storage unit of the all-vanadium redox flow battery system is designed to have n battery modules which are connected in series and are denoted as M1 and M2 … … Mn; the battery module comprises at least one pile group, a positive electrolyte storage tank, a negative electrolyte storage tank and a first electrolyte circulation pipeline for electrolyte transmission, and the battery module MiRespectively from the battery module MiThe corresponding positive/negative electrolyte storage tanks are transported and distributed to the battery module M through the first electrolyte circulation pipelineiAfter each galvanic pile is arranged, electrolyte with the same polarity of each galvanic pile is conveyed to the battery module M consistent with the conveyed electrolyte polarity through the second electrolyte circulation pipelinei+1I is more than or equal to 1 and less than n in the corresponding electrolyte storage tank; if i is equal to n, the battery module MnRespectively from the battery module MnThe corresponding positive/negative electrolyte storage tanks are transported and distributed to the battery module M through the first electrolyte circulation pipelinenAfter each galvanic pile is arranged, electrolyte with the same polarity of each galvanic pile is conveyed to the battery module M consistent with the conveyed electrolyte polarity through the second electrolyte circulation pipeline1The corresponding electrolyte storage tank.
In a further example, the positive/negative electrolyte storage tanks of each battery module are respectively configured with a liquid level detector-liquid level sensor, and the liquid level detector-liquid level sensor is configured to detect a liquid level signal in the electrolyte storage tank corresponding to the liquid level sensor and feed the liquid level signal back to the battery management system of the energy storage unit so that the battery management system can adjust the flow rate of the electrolyte, and further the liquid levels of the positive/negative electrolyte storage tanks of each battery module tend to be consistent.
In a further example, the energy storage unit further comprises a plurality of variable frequency controllers, so that the electrolyte circulating pump is controlled by each variable frequency controller to adjust the flow of the electrolyte, and the liquid level in the positive/negative liquid storage tanks in the battery modules where the variable frequency controllers are located is controlled or adjusted, so that the liquid level in each positive/negative liquid storage tank is kept consistent.
Based on the above example description and FIG. 3, with 3 battery modulesTo further illustrate the construction of the energy storage unit as in example 1, in a specific example 1, the energy storage unit has 3 battery modules, denoted M1, M2, M3; the battery module comprises an electric pile group (comprising 2 electric piles), a positive electrolyte storage tank, a negative electrolyte storage tank and a first electrolyte circulation pipeline (the first electrolyte circulation pipeline is an original pipeline of the energy storage unit) for electrolyte transmission, and the battery module M1Positive electrode electrolyte self-cell module M1The corresponding anode electrolyte storage tank is conveyed and distributed to the battery module M through the first electrolyte circulation pipeline1After each electric pile is arranged, electrolyte with the same polarity as the positive electrode of each electric pile is conveyed to the battery module M consistent with the polarity of the conveyed electrolyte through the second electrolyte circulation pipeline (the part is a pipeline additionally arranged in the original pipeline of the energy storage unit)2Corresponding positive electrode electrolyte storage tank, and battery module M1From the battery module M1The corresponding negative electrolyte storage tank is conveyed and distributed to the battery module M through the first electrolyte circulation pipeline1After each electric pile is arranged, electrolyte with the same polarity as the negative electrode of each electric pile is conveyed to the battery module M consistent with the polarity of the conveyed electrolyte through the second electrolyte circulation pipeline (the part is a pipeline additionally arranged in the original pipeline of the energy storage unit)2The corresponding negative electrolyte storage tank; the battery module M2Positive electrode electrolyte self-cell module M2The corresponding anode electrolyte storage tank is conveyed and distributed to the battery module M through the first electrolyte circulation pipeline2After each electric pile is arranged, electrolyte with the same polarity as the positive electrode of each electric pile is conveyed to the battery module M consistent with the polarity of the conveyed electrolyte through the second electrolyte circulation pipeline (the part is a pipeline additionally arranged in the original pipeline of the energy storage unit)3Corresponding positive electrode electrolyte storage tank, and battery module M2From the battery module M2The corresponding negative electrolyte storage tank is conveyed and distributed to the battery module M through the first electrolyte circulation pipeline2After each galvanic pile, is circulated by the second electrolyteA pipeline (the part is a new pipeline added in the original pipeline of the energy storage unit) is used for conveying the electrolyte with the same polarity as the negative electrode of each electric pile to the battery module M consistent with the polarity of the conveyed electrolyte3The corresponding negative electrolyte storage tank; the battery module M3Positive electrode electrolyte self-cell module M3The corresponding anode electrolyte storage tank is conveyed and distributed to the battery module M through the first electrolyte circulation pipeline3After each electric pile is arranged, electrolyte with the same polarity as the positive electrode of each electric pile is conveyed to the battery module M consistent with the polarity of the conveyed electrolyte through the second electrolyte circulation pipeline (the part is a pipeline additionally arranged in the original pipeline of the energy storage unit)1Corresponding positive electrode electrolyte storage tank, and battery module M3From the battery module M3The corresponding negative electrolyte storage tank is conveyed and distributed to the battery module M through the first electrolyte circulation pipeline3After each electric pile is arranged, electrolyte with the same polarity as the negative electrode of each electric pile is conveyed to the battery module M consistent with the polarity of the conveyed electrolyte through the second electrolyte circulation pipeline (the part is a pipeline additionally arranged in the original pipeline of the energy storage unit)1And the corresponding negative electrolyte storage tank. And the positive/negative electrode electrolyte storage tanks of the battery modules are respectively provided with a digital liquid level sensor and used for detecting liquid level signals in the electrolyte storage tanks corresponding to the liquid level sensors and feeding the liquid level signals back to the original battery management system of the energy storage unit so as to adjust the electrolyte flow by the battery management system (the liquid levels of the positive and negative electrode electrolyte storage tanks of the battery modules are used as feedback signals for battery management control), and further the liquid levels of the positive/negative electrode electrolyte storage tanks of the battery modules tend to be consistent. The energy storage unit adjusts the flow of positive/negative electrolyte in the battery module through a plurality of electrolyte circulating pumps arranged on the first electrolyte circulating pipeline.
From the above example, a method for increasing the dc side voltage of the energy storage unit is introduced, which can effectively solve the above problems: namely, it is
A method for improving the direct-current side voltage of an energy storage unit, wherein the energy storage unit involved in the method is composed of n battery modules which are connected in series with each other, each battery module comprises at least one pile group, a positive electrolyte storage tank, a negative electrolyte storage tank and a first electrolyte circulation pipeline for electrolyte transmission, and the method comprises the following implementation steps:
connecting the n battery modules in series;
one of the battery modules MiIs delivered and distributed to the battery module M by the first electrolyte circulation pipelineiEach pile in the electrolyte tank, and a second electrolyte circulation pipeline conveys electrolyte with the same polarity of each pile to a battery module M consistent with the polarity of the conveyed electrolytei+1I is more than or equal to 1 and less than n in the corresponding electrolyte storage tank;
if i equals n, for the battery module MnIs delivered and distributed to the battery module M by the first electrolyte circulation pipelineiEach pile in the electrolyte tank, and a second electrolyte circulation pipeline conveys electrolyte with the same polarity of each pile to a battery module M consistent with the polarity of the conveyed electrolyte1The corresponding electrolyte storage tank.
Furthermore, a liquid level detector is used for detecting a liquid level signal in the electrolyte storage tank corresponding to the liquid level detector, and the liquid level signal is fed back to the battery management system of the energy storage unit so that the battery management system can adjust the flow of the electrolyte, and the liquid levels of the positive/negative electrolyte storage tanks of the battery modules tend to be consistent.
Further, the flow rate of the positive/negative electrolyte in the battery module is adjusted by the variable frequency controller.
Further, the liquid level detector is a liquid level sensor.
In conclusion, the invention makes effective improvement on the original energy storage unit, so that the electrolyte used by the whole energy storage unit can be shared among the battery modules, thereby effectively solving the problem of SOC difference among the battery modules; meanwhile, the series connection among a plurality of battery modules in the energy storage unit is realized, the output voltage of the alternating current side is improved, and the system loss is reduced.
The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (8)
1. The utility model provides an energy storage unit of all-vanadium redox flow battery system, has n battery module of establishing ties each other, battery module includes at least one electricity and piles up group, anodal electrolyte storage tank, negative pole electrolyte storage tank and be used for supplying the first electrolyte circulation pipeline of electrolyte transmission, its characterized in that: battery module MiRespectively from the battery module MiThe corresponding positive/negative electrolyte storage tanks are transported and distributed to the battery module M through the first electrolyte circulation pipelineiAfter each galvanic pile is arranged, electrolyte with the same polarity of each galvanic pile is conveyed to a battery module M consistent with the conveyed electrolyte polarity through a second electrolyte circulation pipelinei+1I is more than or equal to 1 and less than n in the corresponding electrolyte storage tank; if i is equal to n, the battery module MnRespectively from the battery module MnThe corresponding positive/negative electrolyte storage tanks are transported and distributed to the battery module M through the first electrolyte circulation pipelinenAfter each galvanic pile is arranged, electrolyte with the same polarity of each galvanic pile is conveyed to the battery module M consistent with the conveyed electrolyte polarity through the second electrolyte circulation pipeline1The corresponding electrolyte storage tank.
2. The energy storage unit of the all-vanadium flow battery system of claim 1, wherein: and the positive/negative electrolyte storage tanks of the battery modules are respectively provided with a liquid level detector for detecting liquid level signals in the electrolyte storage tanks corresponding to the liquid level detectors and feeding the liquid level signals back to the battery management system of the energy storage unit so as to adjust the electrolyte flow by the battery management system, so that the liquid levels of the positive/negative electrolyte storage tanks of the battery modules tend to be consistent.
3. The energy storage unit of the all-vanadium flow battery system of claim 2, wherein: the energy storage unit also comprises a plurality of variable frequency controllers, and the variable frequency controllers are used for adjusting the flow of the positive/negative electrolyte in the battery modules where the variable frequency controllers are located.
4. The energy storage unit of the all-vanadium flow battery system of claim 2, wherein: the liquid level detector is a liquid level sensor.
5. A method for improving the voltage of the direct current side of an energy storage unit is characterized by comprising the following steps:
connecting the n battery modules in series;
one of the battery modules MiIs delivered and distributed to the battery module M by the first electrolyte circulation pipelineiEach pile in the electrolyte tank, and a second electrolyte circulation pipeline conveys electrolyte with the same polarity of each pile to a battery module M consistent with the polarity of the conveyed electrolytei+1I is more than or equal to 1 and less than n in the corresponding electrolyte storage tank;
if i equals n, for the battery module MnIs delivered and distributed to the battery module M by the first electrolyte circulation pipelineiEach pile in the electrolyte tank, and a second electrolyte circulation pipeline conveys electrolyte with the same polarity of each pile to a battery module M consistent with the polarity of the conveyed electrolyte1The corresponding electrolyte storage tank.
6. The method according to claim 5, wherein a liquid level detector is used to detect a liquid level signal in the electrolyte storage tank corresponding to the liquid level detector, and the liquid level signal is fed back to the battery management system of the energy storage unit to adjust the electrolyte flow rate, so that the liquid levels of the positive/negative electrolyte storage tanks of the battery modules tend to be consistent.
7. The method of claim 5, wherein the variable frequency controller regulates the flow of positive/negative electrolyte in the battery module in which the variable frequency controller is located.
8. The method of increasing the dc side voltage of an energy storage unit of claim 5, wherein the level detector is a level sensor.
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| CN114024007A (en) * | 2021-11-02 | 2022-02-08 | 北京普能世纪科技有限公司 | Vanadium cell SOC balanced system |
| CN114883596A (en) * | 2020-12-21 | 2022-08-09 | 广东三水合肥工业大学研究院 | Positive electrode precipitate recovery device for managing all-vanadium redox flow battery |
| CN114883596B (en) * | 2020-12-21 | 2024-04-26 | 广东三水合肥工业大学研究院 | Positive electrode precipitate recovery device for managing all-vanadium redox flow battery |
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