Header type modular electrolyte valence state production system

Abstract

The utility model belongs to the technical field of all-vanadium redox flow batteries, and particularly relates to a header type modularized electrolyte valence state production system which comprises a container, a cooling fan, two groups of electrolytic galvanic piles and an electrolytic power supply, the two groups of electrolytic galvanic piles are arranged in the container side by side and are connected with the electrolytic power supply through cables; windows are formed in the positions, corresponding to the two groups of electrolysis galvanic piles, of the top of the container respectively, and cover plates are arranged on the windows; two groups of hinged doors are arranged on one side of the container, and locks are arranged on the hinged doors; an inlet-outlet pipe connecting seat is arranged on the rear side of the container; ventilation openings are formed in the left side and the right side of the container; and the pipelines of the two groups of electrolysis galvanic piles are connected in parallel. The beneficial effects of the utility model are that by adopting the header type modular structure, the electrolyte valence state adjusting bypass matching operation of the energy storage system of the multi-power all-vanadium redox flow battery can be rapidly realized by utilizing the matching of the number of the headers, and the efficiency of the production of the electrolyte of the all-vanadium redox flow battery is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vanadium redox flow battery technology, and particularly relates to a modular electrolyte valence state production system. Background Technology

[0002] Vanadium redox flow battery (VRB) is a new type of high-efficiency, high-capacity energy storage battery with long lifespan and high safety. It has been successfully demonstrated in wind farms for smooth power output and has broad application prospects in the vast new energy field, such as wind power, photovoltaic power, and smart grids. In the production of electrolytes for VRBs, the electrolyte stack is the carrier device for the circulating flow of electrolyte within the battery. It plays a role in sealing and regulating the flow of electrolyte within the battery, significantly impacting the charging performance of the electrolyte.

[0003] In practical applications, vanadium redox flow batteries experience side reactions such as hydrogen evolution and oxygen evolution during charging and discharging, which can lead to an imbalance in electrolyte valence states and concentrations. This results in continuous capacity decay and severely impacts the normal operation of the energy storage system. Valence state adjustment in vanadium redox flow batteries is achieved by altering the concentration ratios of vanadium ions in different valence states within the electrolyte. Specifically, vanadium battery electrolyte valence state adjustment involves changing the concentration ratios of V2+ / V3+ and V4+ / V5+ ions in the electrolyte to maintain a constant concentration ratio of these ions during charging and discharging, thereby preserving battery performance stability.

[0004] Chinese utility model patent application number 202120296345.1 discloses a mobile vanadium electrolyte production system, including a housing, a crude electrolyte preparation area, and a refined electrolyte preparation area. The crude electrolyte preparation area is located inside the housing and includes an automatic feeding system and a reactor. The automatic feeding system supplies materials to the reactor. The refined electrolyte preparation area is also located inside the housing and includes a cathode liquid storage tank, a cathode pump, an anolyte storage tank, an anolyte pump, and an electrolysis device. The cathode liquid storage tank receives the crude electrolyte prepared in the reactor, and the refined electrolyte preparation area forms a cathode liquid circulation loop and an anolyte circulation loop. The system enables on-site production of vanadium electrolyte, with a high degree of integration, high degree of automation, and small footprint.

[0005] In the existing technology, how to improve the processing speed of customer needs and how to increase the current density of fuel cell stacks are endless pursuits for scientific and technical personnel in the industry. Utility Model Content

[0006] The purpose of this invention is to provide a modular electrolyte valence state production system that overcomes the shortcomings of existing technologies. By adopting a modular modular structure, the electrolyte valence state adjustment and matching operation of multi-power specification vanadium redox flow battery energy storage systems can be quickly realized through matching the number of boxes, reducing the problem of excessive time consumption caused by matching design; and optimizing the structure of the electrolytic cell stack to achieve a greater current density with the same stack volume.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A modular, containerized electrolyte production system includes a container, cooling fans, an electrolytic stack, and an electrolytic power supply. Two sets of electrolytic stacks are arranged side-by-side inside the container, connected to the electrolytic power supply via cables. The top of the container has windows corresponding to the positions of the two electrolytic stacks, each with a cover. One side of the container has two sets of double doors with locks. The rear of the container has inlet / outlet pipe connection points. Ventilation openings are located on the left and right sides of the container, with cooling fans installed inside. Power terminals are located on the left or right side panels of the container. The piping of the two electrolytic stacks is connected in parallel, with their positive electrode inlet / outlet pipes and negative electrode inlet / outlet pipes connected accordingly. Each electrolytic stack includes end plates and membrane reaction units. Multiple membrane reaction units are stacked between the two end plates and fixed together with multiple sets of bolts. Each membrane reaction unit includes a bidirectional current collector plate, a positive electrode plate, a negative electrode plate, and a separator. The bidirectional current collector plate has an electrode area on each of its two sides for placing electrodes. A liquid flow hole is located at each of the four corners of the plate. A flow guiding groove is provided within each electrode area. A positive electrode plate is located on one side of the bidirectional current collector plate, and a negative electrode plate is located on the other side. A diaphragm is located outside the positive electrode plate and / or outside the negative electrode plate. A sealing gasket is provided between the bidirectional current collector plate and the diaphragm. A pressure balance hole is located in the center of the electrode area of ​​the bidirectional current collector plate. A pressure bearing platform is located around the pressure balance hole, and an annular sealing groove is provided on the pressure bearing platform. A liquid flow guide platform is provided on each of the liquid flow holes. Two liquid flow guide platforms at opposite corners on the same side have the same structure. A through hole is provided on the side of the liquid flow guide platform, and the through hole communicates with the guide groove in the electrode area. An annular groove is provided on the surface of the liquid flow guide platform. At least two of the following are provided on one end clamp plate at positions corresponding to the liquid flow holes: a positive liquid inlet pipe, a positive liquid outlet pipe, a negative liquid inlet pipe, and a negative liquid outlet pipe.

[0009] Furthermore, both the positive and negative electrode plates are made of carbon felt or graphite felt.

[0010] Furthermore, the diaphragm is a perfluorosulfonic acid type ion exchange membrane from DuPont.

[0011] Furthermore, one of the end clamps is simultaneously provided with a positive electrode liquid inlet pipe, a positive electrode liquid outlet pipe, a negative electrode liquid inlet pipe, and a negative electrode liquid outlet pipe.

[0012] Furthermore, the flow guiding groove includes two parallel main guide grooves and a branch guide groove connecting the two main guide grooves; two sealing grooves are provided around the bidirectional flow collecting electrode plate outside the flow hole; the sealing groove on the pressure bearing platform, the sealing groove on the plate surface and the annular groove on the surface of the flow guiding platform are all located on both sides of the bidirectional flow collecting electrode plate.

[0013] Furthermore, the diaphragm is provided with openings at positions corresponding to the liquid flow holes and pressure balance holes.

[0014] Furthermore, the container is equipped with lifting rings at each of the four corners of its top; and filters are installed on the ventilation openings.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) By adopting a modular structure with a collection box, the electrolyte valence state adjustment bypass operation of multi-power specification vanadium redox flow battery energy storage system can be quickly realized by matching the number of collection boxes, which solves the common problem in the industry that the conventional matching design takes too long and improves the competitiveness of the flow battery market.

[0017] 2) The optimized electrolytic cell stack structure effectively reduced the size of the stacked plates, achieving a larger current density within the same stack volume and improving the efficiency of vanadium redox flow battery electrolyte production. Attached Figure Description

[0018] Figure 1 This is an external three-dimensional schematic diagram of an embodiment of the modular electrolyte valence state production system of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the modular electrolyte valence state production system of this utility model, with a set of double doors hidden on the right side;

[0020] Figure 3 This is a three-dimensional schematic diagram of the electrolytic stack in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the electrolytic stack structure in an embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the exploded structure of the membrane reaction unit in an embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram of the bidirectional current collecting electrode plate structure in an embodiment of this utility model;

[0024] Figure 7 yes Figure 6 Sectional view along line AA;

[0025] In the diagram: 1-Container, 2-Cooling fan, 3-Electrolysis stack, 4-Electrolysis power supply, 5-Cover plate, 6-Door-to-door, 7-Ventilation vent, 8-Power terminal block, 9-Lifting ring, 10-Sealing gasket, 11-Bidirectional current collector plate, 12-Positive electrode plate, 13-Negative electrode plate, 14-Diaphragm, 15-Liquid flow hole, 16-Pressure balance hole, 17-Main guide groove, 18-Sub-guide groove, 19-Sealing groove, 20-Pressure bearing platform, 21-Sealing groove, 22-Liquid flow guide platform, 23-Through hole, 24-Annular groove, 25-End clamp, 26-Membrane reaction unit, 27-Bolt, 28-Positive electrode liquid inlet pipe, 29-Positive electrode liquid outlet pipe, 30-Negative electrode liquid inlet pipe, 31-Negative electrode liquid outlet pipe, 32-Inlet / outlet pipe connection seat. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0028] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0029] See Figure 1-2This is a schematic diagram of an embodiment of the modular electrolyte production system of this utility model, including a container 1, a cooling fan 2, an electrolytic stack 3, and an electrolytic power supply 4. Two sets of electrolytic stacks 3 are arranged side-by-side inside the container 1, and the two sets of electrolytic stacks 3 are connected to the electrolytic power supply 4 via cables. Windows are provided on the top of the container 1 corresponding to the positions of the two sets of electrolytic stacks 3, and each window is equipped with a cover plate 5. The electrolytic stacks 3 can be removed from the top windows of the container 1 as needed, improving maintenance efficiency. Two sets of double doors 6 are provided on one side of the container 1, and each double door 6 is equipped with a lock. When the production system is working, the double doors 6 are closed to reduce internal contamination. An inlet / outlet pipe connection seat 32 is provided on the rear side of the container 1. Ventilation openings 7 are provided on the left and right sides of the container 1, and a cooling fan 2 is installed inside each ventilation opening. A power terminal block 8 is provided on the left or right side panel of the container 1. The pipelines of the two sets of electrolytic stacks 3 are connected in parallel, with their positive electrode inlet / outlet pipes connected correspondingly, and their negative electrode inlet / outlet pipes connected correspondingly. The top four corners of container 1 are equipped with lifting rings 9; the ventilation openings 7 are equipped with filters to filter dust in the air.

[0030] See Figure 3 The electrolytic cell stack 3 includes end plates 25 and membrane reaction units 26. Multiple sets of membrane reaction units 26 are stacked between the two end plates 25 and connected and fixed as a whole by multiple sets of bolts 27. The positive electrode liquid inlet pipe 28, the positive electrode liquid outlet pipe 29, the negative electrode liquid inlet pipe 30, and the negative electrode liquid outlet pipe 31 are all located on the same end plate 25. The positive electrode liquid inlet pipe 28 and the negative electrode liquid inlet pipe 30 both enter from the lower position, while the positive electrode liquid outlet pipe 29 and the negative electrode liquid outlet pipe 31 exit from the higher position, which can maximize the expulsion of air in the flow channel and improve the uniformity of the electrolytic reaction.

[0031] See Figure 4-7 The membrane reaction unit includes a bidirectional current collector plate 11, a positive electrode plate 12, a negative electrode plate 13, and a diaphragm 14. A positive electrode plate 12 is provided on one side of the bidirectional current collector plate 11, and a negative electrode plate 13 is provided on the other side. A diaphragm 14 is provided on the outer side of the positive electrode plate 12 and the outer side of the negative electrode plate 13, respectively. A sealing gasket 10 is provided between the bidirectional current collector plate 11 and the diaphragm 14. Each of the two sides of the bidirectional current collector plate 11 has an electrode area for placing an electrode. A liquid flow hole 15 is provided at each of the four corners of the plate. A liquid flow guide platform 22 is provided on the liquid flow hole 15. Two liquid flow guide platforms 22 at opposite corners on the same side have the same structure and are symmetrically arranged. A through hole 23 is provided on the side of the liquid flow guide platform. The through hole 23 is connected to the main guide groove 17 in the electrode area. An annular groove 24 is provided on the surface of the liquid flow guide platform 22. The electrode area is provided with a flow guiding groove, which includes two parallel main guide grooves 17 and a sub-guide groove 18 connecting the two main guide grooves 17. The plate surface outside the liquid flow hole 15 is provided with two rings of sealing grooves 19.

[0032] A pressure balancing hole 16 is centrally located within the electrode area of ​​the bidirectional current collector plate 11. A pressure-bearing platform 20 surrounds the pressure balancing hole 16, and an annular sealing groove 21 is provided on the pressure-bearing platform 20. The sealing groove 21 on the pressure-bearing platform 20, the sealing groove band 19 on the plate surface, and the annular groove 24 on the surface of the liquid flow guide platform are all located on both sides of the bidirectional current collector plate 11. Multiple membrane reaction units are stacked sequentially, with both ends sealed by end clamps and connected by long bolts to form a vanadium redox flow battery or an electrolytic stack used in electrolyte production. After the long bolts are tightened, the sealing gasket 10 is compressed and deformed, filling the sealing groove band 19, sealing groove 21, and annular groove 24, thereby achieving a seal. Bolts are also installed in the pressure balancing hole 16 to balance the deformation caused by tightening other bolts, keeping the overall structure of the stack stable. The balanced clamping effect helps improve the uniformity of liquid flow in the membrane reaction unit and reduces internal leakage.

[0033] Both the positive electrode plate 12 and the negative electrode plate 13 are made of carbon felt or graphite felt. These materials possess good electrical conductivity and chemical stability, enabling them to withstand the chemical reactions that occur during battery charging and discharging. The porous structure of carbon felt and graphite felt facilitates electrolyte penetration and ion diffusion, thereby improving the battery's energy conversion efficiency. Furthermore, these materials also have a high specific surface area, providing more active sites for electrochemical reactions.

[0034] The diaphragm 14 is a perfluorosulfonic acid ion exchange membrane from DuPont, a strong acid ion exchange membrane with good hydrophilicity. It has a high water content and low membrane resistance. Due to the low concentration of fixed ions inside the membrane, it exhibits weak repulsion towards hydroxide ions and good chemical stability during electrolysis in acidic solutions. Nafion membranes are a representative product of this company. Openings are provided on the diaphragm 14 corresponding to the positions of the liquid flow orifice 15 and the pressure balance orifice 16, ensuring that they do not affect the sealing when connecting adjacent membrane reaction units.

[0035] Alternatively, an embodiment may be provided with at least two of the following on an end clamp 25 at a position corresponding to the liquid flow hole 15: a positive electrode liquid inlet pipe 28, a positive electrode liquid outlet pipe 29, a negative electrode liquid inlet pipe 30, and a negative electrode liquid outlet pipe 31, as long as the positive electrode electrolyte and the negative electrode electrolyte can flow with minimal liquid resistance.

[0036] 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 modular, container-type electrolyte valence state production system, characterized in that, The system includes a container, cooling fans, electrolytic stacks, and an electrolytic power supply. Two sets of electrolytic stacks are arranged side-by-side inside the container and connected to the electrolytic power supply via cables. The top of the container has windows corresponding to the positions of the two sets of electrolytic stacks, each with a cover. One side of the container has two sets of double doors equipped with locks. The rear of the container has inlet / outlet pipe connection points. Ventilation openings are located on the left and right sides of the container, with cooling fans installed inside each opening. A power terminal block is located on the left or right side panel of the container. The piping of the two sets of electrolytic stacks is connected in parallel, with their positive electrode liquid inlet / outlet pipes and negative electrode liquid inlet / outlet pipes connected accordingly. The electrolytic stack includes end plates and membrane reaction units. Multiple sets of membrane reaction units are stacked between the two end plates and fixed by multiple sets of bolts. Each membrane reaction unit includes a bidirectional current collector plate, a positive electrode plate, a negative electrode plate, and a diaphragm. Each side surface of the bidirectional current collector plate has an electrode area for placing an electrode. Each of the four corners of the plate has a liquid flow hole. The electrode area has a flow guiding groove. A positive electrode plate is located on one side of the bidirectional current collector plate, and a negative electrode plate is located on the other side. A diaphragm is located on the outer side of the positive electrode plate and / or the outer side of the negative electrode plate. A space is provided between the bidirectional current collector plate and the diaphragm. A sealing gasket; a pressure balance hole is provided in the center of the electrode area of ​​the bidirectional current collector electrode plate, and a pressure bearing platform is provided around the pressure balance hole, with an annular sealing groove on the pressure bearing platform; a liquid flow guide platform is provided on each of the liquid flow holes, and two liquid flow guide platforms at diagonal positions on the same side surface have the same structure, with a through hole on the side of the liquid flow guide platform, which is connected to the guide groove in the electrode area, and an annular groove on the surface of the liquid flow guide platform; at least two of the following are provided on one end clamp plate at the position corresponding to the liquid flow hole: positive liquid inlet pipe, positive liquid outlet pipe, negative liquid inlet pipe, and negative liquid outlet pipe.

2. The modular electrolyte valence state production system according to claim 1, characterized in that, Both the positive and negative electrode plates are made of carbon felt or graphite felt.

3. The modular electrolyte valence state production system according to claim 1, characterized in that, The diaphragm is a perfluorosulfonic acid ion exchange membrane from DuPont.

4. The modular electrolyte valence state production system according to claim 1, characterized in that, One of the end clamps is simultaneously provided with a positive electrode liquid inlet pipe, a positive electrode liquid outlet pipe, a negative electrode liquid inlet pipe, and a negative electrode liquid outlet pipe.

5. The modular electrolyte valence state production system according to claim 1, characterized in that, The flow guiding groove includes two parallel main guide grooves and a branch guide groove connecting the two main guide grooves; the bidirectional flow collecting electrode plate outside the liquid flow hole is provided with two rings of sealing grooves; the sealing groove on the pressure bearing platform, the sealing groove on the surface of the plate and the ring groove on the surface of the liquid flow guiding platform are all located on both sides of the bidirectional flow collecting electrode plate.

6. The modular electrolyte valence state production system according to claim 1, characterized in that, The diaphragm has openings at positions corresponding to the liquid flow holes and pressure balance holes, respectively.

7. The modular electrolyte valence state production system according to claim 1, characterized in that, The container is equipped with lifting rings at each of its four top corners; The vents are equipped with filters.

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