Capacity-expandable all-vanadium redox flow battery energy storage equipment

Abstract

The utility model relates to the technical field of energy storage equipment, and discloses expandable all-vanadium redox flow battery energy storage equipment which comprises a PLC (Programmable Logic Controller), an all-vanadium redox flow battery electric pile, a first solution pump and a second solution pump, and the output end of the first solution pump and the output end of the second solution pump are both connected into the PLC; the input end of the first solution pump and the input end of the second solution pump are connected with a positive electrode multi-way valve pipe and a negative electrode multi-way valve pipe respectively, a plurality of ports, away from the first solution pump, of the positive electrode multi-way valve pipe are connected with positive electrode electromagnetic valve pipes, and one ends of the positive electrode electromagnetic valve pipes are connected with a positive electrode electrolyte tank. In the specific use process of the all-vanadium redox flow battery energy storage equipment provided by the utility model, the capacity expansion requirement is met by adopting an electrolyte modularization mode and an electrolyte independent supply mode, the voltage of a galvanic pile is monitored in real time through a voltage sensor, and when the voltage reaches a specified requirement, the electrolyte of the module is judged to be fully filled or completely discharged.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, specifically to an expandable all-vanadium redox flow battery energy storage device. Background Technology

[0002] The existing vanadium redox flow battery is a novel form of energy. It mainly converts electrical energy into chemical energy through a vanadium redox flow stack and stores it, converting it back into electrical energy when needed. In practical applications, it exhibits several advantages over traditional batteries. For example, the electrolyte of the vanadium redox flow battery is an acidic aqueous solution of vanadium ions. It operates at normal temperature and pressure, eliminating the risk of thermal runaway and possessing intrinsic safety. Even if the positive and negative electrolytes are directly mixed, there is no risk of combustion or fire. It also has a long cycle life: the charge-discharge cycle count of the vanadium redox flow battery can reach more than 15,000 times, with a service life of 15 to 20 years or even longer. Compared with other energy storage technologies, such as lithium batteries, its cycle life advantage is significant, greatly reducing long-term operating costs and replacement frequency.

[0003] However, existing vanadium redox flow batteries still suffer from small capacity due to their individual cell structure, which limits their use in large-scale energy storage projects. Therefore, this application aims to address the problems of the existing technology by providing a scalable vanadium redox flow battery energy storage device. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a scalable all-vanadium redox flow battery energy storage device, solving the problems mentioned in the background section.

[0005] This utility model provides the following technical solution: an expandable vanadium redox flow battery energy storage device, including a PLC controller, a vanadium redox flow battery stack, a first solution pump, and a second solution pump. The output terminals of the first and second solution pumps are both connected to the PLC controller. The input terminals of the first and second solution pumps are respectively connected to a positive multi-way valve tube and a negative multi-way valve tube. Several ports of the positive multi-way valve tube away from the first solution pump are connected to positive solenoid valve tubes, and one end of each of the positive solenoid valve tubes is connected to a positive electrolyte tank. Several ports of the negative multi-way valve tube away from the negative multi-way valve tube are connected to negative solenoid valve tubes, and one end of each of the negative solenoid valve tubes is connected to a negative electrolyte tank.

[0006] Specifically, the PLC controller is equipped with a voltage sensor that can monitor the voltage of the vanadium redox flow battery stack. When the voltage reaches the specified requirement, it determines whether the electrolyte in this module is full or empty. The vanadium redox flow battery stack, the first solution pump, the second solution pump, the positive multi-way valve tube, the negative multi-way valve tube, the positive solenoid valve tube, and the negative solenoid valve tube are electrically connected to each other via wires.

[0007] Ideally, the ratio of electrolyte capacity in the vanadium redox flow battery stack to that in the positive electrolyte tanks and the negative electrolyte tanks is 1:4, at which point the efficiency is optimal.

[0008] Specifically, a filtration device is provided between the positive electrode multi-way valve tube and the input terminal of the first solution pump, and between the negative electrode multi-way valve tube and the input terminal of the second solution pump, to filter the electrolyte used in the overall equipment. The filtration device includes two filter valve tubes, one end of which is connected to a first transition tube, and the other end of which is connected to a second transition tube. One end of the first transition tube is connected to the corresponding positive electrode multi-way valve tube port or the corresponding negative electrode multi-way valve tube port, and one end of the second transition tube is connected to the corresponding first solution pump input terminal or the corresponding second solution pump input terminal.

[0009] Specifically, both filter valve tubes have T-grooves in the middle of their internal tubes to provide installation space for subsequent structures. A composite sleeve and a sealing cover are respectively fitted into the T-grooves, and the inner wall of the sealing cover is fixedly connected to the top of one side of the composite sleeve. The two side walls and the top of the other side of the composite sleeve are provided with clearance grooves, and filter screens are nested in the clearance grooves in the side wall and the top of the other side of the composite sleeve. This ensures smooth flow inside the filter valve tube while simultaneously filtering the flowing electrolyte.

[0010] The composite sleeve features an inverted V-shaped fold design on one side of its bottom, which reduces the transverse connection area between the space on one side of the composite sleeve and the space on the other side. This makes it difficult for the impurities collected inside the composite sleeve to flow back, preventing the impurities from circulating within the overall equipment.

[0011] The selected features include threaded holes in the middle of the inner tubes of both filter valve tubes and countersunk holes in the inner parts of both sealing covers. The sealing covers and the corresponding filter valve tubes are detachably installed by means of screws fitting into the countersunk holes and then threadedly connecting to the corresponding threaded holes. This creates favorable conditions for the subsequent cleaning and continuous use of the composite sleeve. In addition, a sealing ring is nested at the bottom of the sealing cover to ensure the sealing effect of the sealing cover on the T-groove after it is assembled with the filter valve tube.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In practical use, the vanadium redox flow battery energy storage device adopts a modular electrolyte approach, and completes the capacity expansion requirements through independent electrolyte supply. The voltage of the battery stack is monitored in real time by a voltage sensor, and when the voltage reaches the specified requirement, it is determined that the electrolyte of this module is full or empty.

[0014] 2. In the specific use of the vanadium redox flow battery energy storage device provided by this utility model, the first solution pump, the second solution pump, the positive electrode multi-way valve tube, the negative electrode multi-way valve tube, the positive electrode solenoid valve tube, and the negative electrode solenoid valve tube are controlled by the PLC controller to select the electrolyte to be charged and discharged. In this way, the whole device can be charged and discharged at any ratio.

[0015] 3. This utility model uses a filtration device to perform auxiliary filtration and impurity collection on the electrolyte flowing inside the vanadium redox flow battery energy storage device. The main filtration structure inside the filtration device is designed for repeated disassembly and cleaning, thus ensuring continuous use. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a front view schematic diagram of the filter valve tube structure of this utility model;

[0018] Figure 3 This is a top view of the T-slot structure of this utility model;

[0019] Figure 4 This is a partial cross-sectional schematic diagram of the filter valve tube of this utility model.

[0020] Figure 5 This is an enlarged schematic diagram of the sealing cover plate of this utility model;

[0021] Figure 6 This is an enlarged schematic diagram of the composite sleeve structure of this utility model.

[0022] In the diagram: 1. PLC controller; 2. Vanadium redox flow battery stack; 3. First solution pump; 4. Second solution pump; 5. Positive electrode multi-way valve tube; 6. Negative electrode multi-way valve tube; 7. Positive electrode electrolyte tank; 8. Positive electrode solenoid valve tube; 9. Negative electrode electrolyte tank; 10. Negative electrode solenoid valve tube; 11. Filter valve tube; 12. First transition tube; 13. Second transition tube; 14. T-slot; 15. Composite sleeve; 16. Sealing cover plate; 17. Filter screen. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Please see Figure 1 A scalable vanadium redox flow battery energy storage device includes a PLC controller 1, a vanadium redox flow battery stack 2, a first solution pump 3, and a second solution pump 4. The output terminals of the first solution pump 3 and the second solution pump 4 are both connected to the PLC controller 1. The input terminals of the first solution pump 3 and the second solution pump 4 are respectively connected to a positive multi-way valve tube 5 and a negative multi-way valve tube 6. Several ports of the positive multi-way valve tube 5 away from the first solution pump 3 are connected to positive solenoid valve tubes 8, and one end of several positive solenoid valve tubes 8 is connected to a positive electrolyte tank 7. Several ports of the negative multi-way valve tube 6 away from the negative multi-way valve tube 6 are connected to negative solenoid valve tubes 10, and one end of several negative solenoid valve tubes 10 is connected to a negative electrolyte tank 9.

[0026] The PLC controller 1 is equipped with a voltage sensor that can monitor the voltage of the vanadium redox flow battery stack 2. When the voltage reaches the specified requirement, it determines whether the electrolyte in this module is full or empty. The vanadium redox flow battery stack 2, the first solution pump 3, the second solution pump 4, the positive electrode multi-way valve tube 5, the negative electrode multi-way valve tube 6, the positive electrode solenoid valve tube 8, and the negative electrode solenoid valve tube 10 are electrically connected through wires. The electrolyte capacity ratio of the vanadium redox flow battery stack 2 to several positive electrode electrolyte tanks 7 and several negative electrode electrolyte tanks 9 is 1:4, at which point the efficiency is optimal.

[0027] In a specific embodiment: the principle is that the positive and negative electrode electrolytes are circulated into the vanadium redox flow battery stack 2 through the first solution pump 3 and the second solution pump 4, respectively. Then, chemical valence changes occur in the vanadium redox flow battery stack 2, and charging and discharging are performed. Taking 50kW as an example, when the pump flow rate is constant during charging, as time goes on, the fewer ions undergo chemical valence changes per unit time, the lower the power that can be absorbed. For example, if there are 100 ions before the valence change begins, and the pumping speed of the first solution pump 3 and the second solution pump 4 is constant per minute, the amount of positive and negative electrode electrolytes entering the vanadium redox flow battery stack 2 is constant. When half of the valence changes, only half of the ions will undergo valence changes subsequently, and the corresponding power will decrease.

[0028] During charging: the positive and negative electrolytes enter the battery stack through the pump and undergo valence state reactions within the battery stack;

[0029] Positive terminal during charging: VO 2+ +H2O→VO 2+ +2H + +e - During charging, the negative terminal is V. 3+ +e - →V 2+ ;

[0030] During discharge: the positive and negative electrolytes enter the fuel cell stack through the pump and undergo valence state reactions within the fuel cell stack;

[0031] Positive electrode during discharge: VO 2+ +2H + +e - →VO 2+ +H₂O, negative electrode during discharge: V 2+ →V 3+ +e - ;

[0032] The specific process is as follows: When the entire device is charging, one positive solenoid valve tube 8, one positive multi-way valve tube 5, one negative solenoid valve tube 10, one negative multi-way valve tube 6, one first solution pump 3, and one second solution pump 4 are turned on. Subsequently, the other positive solenoid valve tubes 8 and negative solenoid valve tubes 10 are turned off. Then, the positive electrolyte inside the positive electrolyte tank 7 enters the vanadium redox flow battery stack 2 under the pumping action of the corresponding first solution pump 3 through the positive multi-way valve tube 5 and one open positive solenoid valve tube 8. Similarly, the positive electrolyte inside the negative electrolyte tank 9 enters the vanadium redox flow battery stack 2 under the pumping action of the corresponding second solution pump 4 through the negative multi-way valve tube 6 and one open negative solenoid valve tube 10. Then, the positive and negative electrolytes undergo valence state changes in the vanadium redox flow battery stack 2, and the voltage changes of the stack are monitored by the voltage sensor inside the PLC controller 1.

[0033] When the upper limit of the charging cutoff voltage is reached, one of the open positive solenoid valve tubes 8 and one of the open negative electrolyte tanks 9 are closed. Then, the next positive solenoid valve tube 8 and the next negative electrolyte tank 9 are opened in sequence. The next cycle of electrolyte charging begins according to the above steps. This process is repeated, and the subsequent discharge follows the same principle.

[0034] Example 2

[0035] Please see Figure 1-6A scalable vanadium redox flow battery energy storage device includes a PLC controller 1, a vanadium redox flow battery stack 2, a first solution pump 3, and a second solution pump 4. The output terminals of the first solution pump 3 and the second solution pump 4 are both connected to the PLC controller 1. The input terminals of the first solution pump 3 and the second solution pump 4 are respectively connected to a positive multi-way valve tube 5 and a negative multi-way valve tube 6. Several ports of the positive multi-way valve tube 5 away from the first solution pump 3 are connected to positive solenoid valve tubes 8, and one end of several positive solenoid valve tubes 8 is connected to a positive electrolyte tank 7. Several ports of the negative multi-way valve tube 6 away from the negative multi-way valve tube 6 are connected to negative solenoid valve tubes 10, and one end of several negative solenoid valve tubes 10 is connected to a negative electrolyte tank 9.

[0036] The PLC controller 1 is equipped with a voltage sensor that can monitor the voltage of the vanadium redox flow battery stack 2. When the voltage reaches the specified requirement, it determines whether the electrolyte in this module is full or empty. The vanadium redox flow battery stack 2, the first solution pump 3, the second solution pump 4, the positive electrode multi-way valve tube 5, the negative electrode multi-way valve tube 6, the positive electrode solenoid valve tube 8, and the negative electrode solenoid valve tube 10 are electrically connected through wires. The electrolyte capacity ratio of the vanadium redox flow battery stack 2 to several positive electrode electrolyte tanks 7 and several negative electrode electrolyte tanks 9 is 1:4, at which point the efficiency is optimal.

[0037] A filtration device is provided between the positive electrode multi-way valve tube 5 and the input end of the first solution pump 3, and between the negative electrode multi-way valve tube 6 and the input end of the second solution pump 4, to filter the electrolyte used in the overall equipment. The filtration device includes two filter valve tubes 11, one end of the two filter valve tubes 11 is connected to a first transition tube 12, and the other end of the two filter valve tubes 11 is connected to a second transition tube 13. One end of the first transition tube 12 is connected to the corresponding positive electrode multi-way valve tube 5 port or the corresponding negative electrode multi-way valve tube 6 port, and one end of the second transition tube 13 is connected to the corresponding first solution pump 3 input end or the corresponding second solution pump 4 input end.

[0038] Both filter valve tubes 11 have T-grooves 14 in the middle of their internal tubes to provide installation space for subsequent structures. A composite sleeve 15 and a sealing cover 16 are respectively fitted inside the T-grooves 14. The inner wall of the sealing cover 16 is fixedly connected to the top of one side of the composite sleeve 15. The two side walls and the top of the other side of the composite sleeve 15 are provided with clearance grooves. The clearance grooves in the side wall and the top of the other side of the composite sleeve 15 are nested with filter screens 17. This ensures smooth flow inside the filter valve tube 11 while simultaneously filtering the flowing electrolyte.

[0039] The bottom of one side of the composite sleeve 15 is designed with an inverted V-shape, which reduces the transverse area of ​​the channel between the space on one side of the composite sleeve 15 and the space on the other side. This makes it difficult for the impurities collected in the composite sleeve 15 to flow back, preventing the impurities from circulating in the overall equipment. The middle of the inner tube of each of the two filter valve tubes 11 is provided with a threaded hole, and the inside of each of the two sealing cover plates 16 is provided with a countersunk hole. The sealing cover plate 16 and the corresponding filter valve tube 11 are detachably installed by means of screws fitting into the countersunk hole and then threadedly connecting to the corresponding threaded hole. This creates favorable conditions for the subsequent cleaning and continuous use of the composite sleeve 15. In addition, a sealing ring is nested at the bottom of the sealing cover plate 16 to ensure the sealing effect of the sealing cover plate 16 and the filter valve tube 11 on the T-groove 14 after assembly.

[0040] In a specific embodiment: the charging and discharging process of the overall device is operated in accordance with the technical content of Embodiment 1 above;

[0041] The positive and negative electrolytes pumped by the first solution pump 3 and the second solution pump 4, respectively, are filtered one-to-one using two corresponding filtration devices. Specifically:

[0042] During use, the valve inside one filter valve tube 11 is open and the valve inside the other filter valve tube 11 is closed. When the positive electrolyte pumped by the first solution pump 3 passes through the corresponding open filter valve tube 11, the impurities inside the positive electrolyte will be filtered and collected by the filter structure composed of the composite sleeve 15 and the filter screen 17 inside the corresponding filter valve tube 11. Similarly, the filtration of the negative electrolyte pumped by the second solution pump 4 is also carried out by the corresponding filter valve tube 11 according to the above principle.

[0043] When one filter valve tube 11 has been used for a certain period of time, in order to avoid clogging, the other unused filter valve tube 11 can be closed and opened to continue to provide filtration. When both filter valve tubes 11 have been used for a certain period of time, during the equipment pause, the screws between the filter valve tube 11 and the corresponding sealing cover plate 16 can be turned off, and then the sealing cover plate 16, the corresponding composite sleeve 15, and the filter screen 17 can be removed for cleaning. After completion, the sealing cover plate 16 and the corresponding composite sleeve 15 and filter screen 17 can be reinstalled to maintain the continuous use effect of the filtration structure composed of the composite sleeve 15 and the filter screen 17. Similarly, the other filter valve tube 11 can be cleaned in the same way.

[0044] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this utility model, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A scalable vanadium redox flow battery energy storage device, comprising a PLC controller (1), a vanadium redox flow battery stack (2), a first solution pump (3), a second solution pump (4), characterized in that: The output end of the first solution pump (3) and the output end of the second solution pump (4) are connected to the PLC controller (1), the input end of the first solution pump (3) and the input end of the second solution pump (4) are respectively connected with the positive multi-way valve pipe (5) and the negative multi-way valve pipe (6), the positive multi-way valve pipe (5) is connected with the positive electrolyte tank (7) at one end, and the negative multi-way valve pipe (6) is connected with the negative electrolyte tank (9) at one end.

2. The scalable vanadium redox flow battery energy storage device of claim 1, wherein: The PLC controller (1) is provided with a voltage sensor capable of monitoring the voltage of the all-vanadium redox flow battery stack (2), and the all-vanadium redox flow battery stack (2), the first solution pump (3), the second solution pump (4), the positive multi-way valve pipe (5), the negative multi-way valve pipe (6), the positive electromagnetic valve pipe (8) and the negative electromagnetic valve pipe (10) are respectively electrically connected through wires.

3. The scalable vanadium redox flow battery energy storage device of claim 1, wherein: The ratio of the electrolyte capacity in the all-vanadium redox flow battery stack (2) to the positive electrolyte tank (7) and the negative electrolyte tank (9) is 1:

4.

4. The scalable vanadium redox flow battery energy storage device of claim 1, wherein: The positive multi-way valve pipe (5) and the first solution pump (3) input end, and the negative multi-way valve pipe (6) and the second solution pump (4) input end are both provided with a filtering device, the filtering device includes two filtering valve pipes (11), one end of the two filtering valve pipes (11) is connected with a first transition pipe (12), the other end of the two filtering valve pipes (11) is connected with a second transition pipe (13), one end of the first transition pipe (12) is connected with the corresponding positive multi-way valve pipe (5) port or the corresponding negative multi-way valve pipe (6) port, and one end of the second transition pipe (13) is connected with the corresponding first solution pump (3) input end or the corresponding second solution pump (4) input end.

5. The scalable vanadium redox flow battery energy storage device of claim 4, wherein: T-shaped grooves (14) are formed in the middle of the inner pipe body of the two filtering valve pipes (11), a composite sleeve (15) and a sealing cover plate (16) are respectively sleeved in the T-shaped grooves (14), the inner wall of the sealing cover plate (16) is fixedly connected with the top of one side of the composite sleeve (15), and the two side walls and the other side of the top of the composite sleeve (15) are provided with displacement grooves.

6. The scalable vanadium redox flow battery energy storage device of claim 5, wherein: The bottom of one side of the composite sleeve (15) is designed to be inverted V-shaped, so that the passage area between the space on one side of the composite sleeve (15) and the space on the other side of the composite sleeve (15) is reduced.

7. The scalable vanadium redox flow battery energy storage device of claim 5, wherein: Threaded holes are formed in the middle of the inner pipe body of the two filtering valve pipes (11), and counterbores are formed in the inner part of the two sealing cover plates (16), the sealing cover plate (16) and the corresponding filtering valve pipe (11) are detachably installed by means of screwing and counterbores, and then threadedly connecting with the corresponding threaded holes, and the bottom of the sealing cover plate (16) is nested with a sealing ring.

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