Efficient preparation method of all-vanadium redox flow battery electrolyte

Abstract

The invention belongs to the technical field of all-vanadium redox flow batteries, and particularly relates to an efficient preparation method of all-vanadium redox flow battery electrolyte, which comprises a catholyte storage tank, a cathode pump, an anolyte storage tank, an anode pump and a header type electrolysis device, and is characterized in that the header type electrolysis device comprises a container, a cooling fan, an electrolysis galvanic pile and an electrolysis power supply; two groups of electrolysis galvanic piles are arranged in the container side by side and are connected with an electrolysis power supply through cables; 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 invention are that the header-type modular structure is adopted, and the matching of the number of the headers is utilized to quickly realize the electrolyte valence state adjusting bypass matching operation of the energy storage system of the multi-power-specification all-vanadium redox flow battery, so that the efficiency of the production of the electrolyte of the all-vanadium redox flow battery is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of all-vanadium redox flow batteries, and particularly relates to an efficient preparation method for the electrolyte of an all-vanadium redox flow battery. Background Art

[0002] An all-vanadium redox flow battery (abbreviated as vanadium battery, VRB) is a new type of high-efficiency and large-capacity energy storage battery with a long service life and high safety. It has been successfully demonstrated and applied to the smooth power output of wind farms. In the future, it has broad application prospects in a wide range of new energy fields, such as wind power generation, photovoltaic power generation, smart grid, etc. In the production of the electrolyte for an all-vanadium redox flow battery, an electrolytic stack is a carrier device for the electrolyte to circulate in the battery. It plays a role in sealing and regulating the flow mode of the electrolyte in the battery body, and has an important impact on the charging performance of the electrolyte.

[0003] In the actual application of an all-vanadium redox flow battery, during the charge and discharge process of the battery, side reactions such as hydrogen evolution and oxygen evolution will occur simultaneously at the positive and negative electrodes, which will lead to the imbalance of the valence state and concentration of the electrolyte, resulting in the continuous attenuation of the battery capacity and seriously affecting the normal operation of the energy storage system. The valence state regulation of an all-vanadium redox flow battery is achieved by changing the concentration ratio of vanadium ions in different valence states in the electrolyte. Specifically, the valence state regulation of the vanadium battery electrolyte is achieved by changing the concentration ratio of V2+ / V3+ and V4+ / V5+ in the electrolyte, so that the concentration ratio of these valence state ions remains unchanged during the charge and discharge process of the battery, thereby maintaining the stability of the battery performance.

[0004] Chinese Utility Model Patent with Application No. 202120296345.1 discloses a movable vanadium electrolyte production system, including a box body, a crude electrolyte preparation area and a refined electrolyte preparation area; the crude electrolyte preparation area is arranged in the box body and includes an automatic feeding system and a reaction kettle; the automatic feeding system supplies materials to the reaction kettle; the refined electrolyte preparation area is arranged in the box body and includes a cathode liquid storage tank, a cathode pump, an anode liquid storage tank, an anode pump and an electrolysis device; the cathode liquid storage tank receives the crude electrolyte prepared in the reaction kettle, and the refined electrolyte preparation area forms a cathode liquid circulation loop and an anode liquid circulation loop. The system can realize the on-site production of vanadium electrolyte at the place of use, with high integration degree, high degree of automatic control and small floor space.

[0005] In the prior art, how to improve the processing speed of customer needs, and how to improve the current density and electrolyte concentration of the stack are endless pursuits for the scientific research and technical personnel in the industry. Summary of the Invention

[0006] The object of the present invention is to provide an efficient preparation method for the electrolyte of a vanadium redox flow battery, overcoming the deficiencies of the prior art. A header box type modular structure is adopted, and through the matching of the number of header boxes, the valence state adjustment and supporting operation of the electrolyte for a vanadium redox flow battery energy storage system with multiple power specifications can be quickly realized, reducing the problem of too long time-consuming caused by supporting design; the structure of the electrolysis stack is optimized, the thickness of the bidirectional current collecting electrode plate is thinned, and the electrolyte density per unit volume is increased; according to needs, the series or parallel relationship of two groups of electrolysis stacks can be quickly switched to rapidly increase the electrolyte concentration.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] An efficient preparation method for the electrolyte of a vanadium redox flow battery, comprising a cathode liquid storage tank, a cathode pump, an anode liquid storage tank, an anode pump and a header-type electrolysis device. The header-type electrolysis device includes a container, a cooling fan, an electrolysis stack and an electrolysis power supply. Two groups of electrolysis stacks are arranged side by side in the container, and the two groups of electrolysis stacks are connected to the electrolysis power supply through cables. Windows are respectively provided at the positions corresponding to the two groups of electrolysis stacks on the top of the container, and cover plates are provided on the windows; two groups of double-leaf doors are provided on one side of the container, and locks are provided on the double-leaf doors; an inlet and outlet pipe connection seat is provided at the rear side of the container; ventilation openings are respectively provided on the left and right sides of the container, cooling fans are installed inside the ventilation openings, and a power supply connection seat is provided on the box board on the left or right side of the container; the electrolysis stack includes end clamping plates and membrane reaction units. Multiple groups of membrane reaction units are stacked and arranged between the two end clamping plates and are fixedly connected by multiple groups of bolts. The membrane reaction unit includes a bipolar current collector electrode plate, an anode plate, a cathode plate and a diaphragm. Each of the two side surfaces of the bipolar current collector electrode plate is provided with an electrode area for placing an electrode, and a liquid flow hole is provided at each of the four corners of the plate body. A diversion groove is provided in the electrode area. An anode plate is provided on one side of the bipolar current collector electrode plate, and a cathode plate is provided on the other side. A diaphragm is provided outside the anode plate and / or outside the cathode plate. A sealing gasket is provided between the bipolar current collector electrode plate and the diaphragm; a pressure balance hole is provided in the middle of the electrode area of the bipolar current collector electrode plate, a pressure-bearing platform is provided around the pressure balance hole, and an annular sealing groove is provided on the pressure-bearing platform; liquid flow guiding platforms are respectively provided on the liquid flow holes, and the two liquid flow guiding platforms at the diagonal positions on the same side surface have the same structure. A through hole is provided on the side of the liquid flow guiding platform, and the through hole is communicated with the guide groove in the electrode area. A ring groove is provided on the surface of the liquid flow guiding platform; at least two of the anode liquid inlet pipe, the anode liquid outlet pipe, the cathode liquid inlet pipe and the cathode liquid outlet pipe are provided at the positions corresponding to the liquid flow holes on one end clamping plate; the anode liquid inlet pipes of the two groups of electrolysis stacks are all connected to the anode pump, the anode liquid outlet pipes are all connected to the anode liquid storage tank, the cathode liquid inlet pipes are all connected to the cathode pump, and the cathode liquid outlet pipes are all connected to the cathode liquid storage tank. Among them, the anode liquid outlet pipe of the first group of electrolysis stacks is connected to the anode liquid inlet pipe of the second group of electrolysis stacks through an anode process switching pipe, and a pneumatic three-way ball valve is provided at the pipe cross-connection; the cathode liquid outlet pipe of the first group of electrolysis stacks is connected to the cathode liquid inlet pipe of the second group of electrolysis stacks through a cathode process switching pipe, and a pneumatic three-way ball valve is also provided at the pipe cross-connection.

[0009] Further, both the anode plate and the cathode plate are carbon felt or graphite felt.

[0010] Further, the diaphragm is a perfluorosulfonic acid type ion exchange membrane of DuPont Company.

[0011] Further, the anode liquid inlet pipe, the anode liquid outlet pipe, the cathode liquid inlet pipe and the cathode liquid outlet pipe are simultaneously provided on one end clamping plate.

[0012] Further, the diversion grooves include two mutually parallel main guide grooves and sub-guide grooves connecting the two main guide grooves; two sealing groove belts are provided around the periphery of the bidirectional current collecting electrode plate outside the liquid flow holes; the sealing grooves on the pressure-bearing platform, the sealing groove belts on the plate surface, and the annular grooves on the surface of the liquid flow guiding platform are all correspondingly located on both sides of the bidirectional current collecting electrode plate.

[0013] Further, openings are respectively provided on the diaphragm corresponding to the positions of the liquid flow holes and the pressure balance holes.

[0014] Further, hoisting rings are respectively provided at the four corners of the top of the container; a filter screen is provided on the ventilation opening.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1) By adopting a header box type modular structure, the matching of the number of header boxes can be used to quickly realize the electrolyte valence state adjustment bypass matching operation of the all-vanadium redox flow battery energy storage system with multiple power specifications, solve the common problem in the industry of too long time-consuming caused by conventional matching designs, and improve the competitiveness of the redox flow battery market;

[0017] 2) Optimize the structure of the electrolytic cell stack, greatly reduce the thickness of the bidirectional current collecting electrode plate, effectively reduce the size after the plate sheets are stacked, so as to obtain a larger current density under the same cell stack volume and improve the efficiency of the production of the all-vanadium redox flow battery electrolyte;

[0018] 3) The two groups of electrolytic cell stacks can be quickly switched into a series or parallel relationship according to the needs of different stages of energy storage, so as to achieve the purpose of quickly increasing the electrolyte concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic process flow diagram of an embodiment of the present invention, only showing the anode circuit, and the cathode circuit is not shown;

[0020] Figure 2 It is a schematic internal structure diagram of the container in the embodiment of the present invention, with the right group of double doors hidden;

[0021] Figure 3 It is a three-dimensional schematic diagram of the electrolytic cell stack in the embodiment of the present invention;

[0022] Figure 4 It is a schematic structure diagram of the electrolytic cell stack in the embodiment of the present invention;

[0023] Figure 5 It is a schematic explosion structure diagram of the membrane reaction unit in the embodiment of the present invention;

[0024] Figure 6 It is a schematic structure diagram of the bidirectional current collecting electrode plate in the embodiment of the present invention;

[0025] Figure 7 Yes Figure 6 is a sectional view taken along line A-A in the figure;

[0026] In the figure: 1 - container, 2 - cooling fan, 3 - electrolytic cell stack, 4 - electrolytic power supply, 5 - cover plate, 6 - double-leaf door, 7 - ventilation opening, 8 - power connection socket, 9 - lifting ring, 10 - gasket, 11 - bipolar current collector electrode plate, 12 - anode plate, 13 - cathode plate, 14 - diaphragm, 15 - liquid flow hole, 16 - pressure balance hole, 17 - main guide groove, 18 - sub-guide groove, 19 - sealing groove belt, 20 - pressure-bearing platform, 21 - sealing groove, 22 - liquid flow guiding platform, 23 - through hole, 24 - ring groove, 25 - end clamping plate, 26 - membrane reaction unit, 27 - bolt, 28 - anode liquid inlet pipe, 29 - anode liquid outlet pipe, 30 - cathode liquid inlet pipe, 31 - cathode liquid outlet pipe, 32 - inlet and outlet pipe connection socket, 33 - cathode liquid storage tank, 34 - cathode pump, 35 - anode liquid storage tank, 36 - anode pump, 37 - header type electrolysis device, 38 - anode process switching pipe, 39 - pneumatic three-way ball valve. Specific embodiments

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the specific embodiments required for use 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 the present invention. For those of ordinary skill in the art, without creative efforts, other specific embodiments can be obtained based on these specific embodiments.

[0029] Generally, the components of the embodiments of the present invention described and shown in the specific embodiments here can be arranged and designed in countless 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 present invention, but only represents the selected embodiments of the present invention.

[0030] See Figure 1-2 , which is a schematic process flow diagram of an efficient preparation method for the electrolyte of a vanadium redox flow battery of the present invention, including a cathode liquid storage tank 33, a cathode pump 34, an anode liquid storage tank 35, an anode pump 36, and a header type electrolysis device 37. The header type electrolysis device 37 is connected to the anode pump 36 and the anode liquid storage tank 35 through an anode pipeline, and the header type electrolysis device 37 is connected to the cathode pump 34 and the cathode liquid storage tank 33 through a cathode pipeline, forming a vanadium redox flow energy storage system for building an energy storage peak shaving power station and connecting to the grid for power generation.

[0031] The header-type electrolysis device includes a container 1, a cooling fan 2, an electrolysis stack 3, and an electrolysis power supply 4. Two groups of electrolysis stacks 3 are arranged side by side in the container 1. The two groups of electrolysis stacks 3 are connected to the electrolysis power supply 4 through cables. Windows are provided at the top of the container 1 corresponding to the positions of the two groups of electrolysis stacks 3, and covers 5 are provided on the windows. As needed, the electrolysis stacks 3 can be taken out from the top windows of the container 1 to improve the maintenance efficiency; two groups of double-leaf doors 6 are provided on one side of the container 1, and locks are provided on the double-leaf doors 6. When the production system is working, the double-leaf doors 6 are closed to reduce the internal pollution of the box body; an inlet / outlet pipe connection seat 32 is provided at the rear of the container 1; ventilation openings 7 are provided on the left and right sides of the container 1 respectively, and cooling fans 2 are installed inside the ventilation openings. A power connection seat 8 is provided on the box panel on the left or right side of the container 1; the pipelines of the two groups of electrolysis stacks 3 are in a parallel relationship, and their anolyte inlet / outlet pipes are correspondingly connected, and their catholyte inlet / outlet pipes are correspondingly connected. Lifting rings 9 are provided at the four corners of the top of the container 1; a filter screen is provided on the ventilation opening 7 to filter dust in the air.

[0032] The anolyte inlet pipes of the two groups of electrolysis stacks are both connected to an anode pump 36, the anolyte outlet pipes are both connected to an anolyte storage tank 35, the catholyte inlet pipes are both connected to a cathode pump 34, and the catholyte outlet pipes are both connected to a catholyte storage tank 33. Among them, the anolyte outlet pipe 29 of the first group of electrolysis stacks is connected to the anolyte inlet pipe 28’ of the second group of electrolysis stacks through an anode process switching pipe 38. A pneumatic three-way ball valve 39 is provided at the pipeline intersection. The pneumatic three-way ball valve 39 is selected as a T-shaped three-way ball valve, so that the switching between the series and parallel connections of the two groups of electrolysis stacks can be realized; similarly, the catholyte outlet pipe of the first group of electrolysis stacks is connected to the catholyte inlet pipe of the second group of electrolysis stacks through a cathode process switching pipe, and a pneumatic three-way ball valve is also provided at the pipeline intersection. The control method is the same as that of the anode circuit and will not be elaborated. When the two groups of electrolysis stacks work in parallel, the anode pump 36 supplies electrolyte to the anode circuits of the two groups of electrolysis stacks at the same time, and the electrolyzed anolyte returns to the anolyte storage tank 35. The same is true for the cathode. When the two groups of electrolysis stacks work in series, the anode pump 36 only supplies electrolyte to the anode circuit of the first group of electrolysis stacks. The electrolyzed anolyte enters the anolyte inlet pipe 28’ of the second group of electrolysis stacks through the anode process switching pipe 38. The anolyte processed by the second group of electrolysis stacks returns to the anolyte storage tank 35. The same is true for the cathode. Generally, the electrolysis efficiency of the first group of electrolysis stacks is about 75%. The series structure can obtain an electrolyte with a deeper electrolysis degree, and the electrolysis efficiency can reach more than 90%. In the later stage of energy storage, the series structure helps to quickly increase the concentration of the electrolyte.

[0033] See Figure 3, the electrolytic cell stack 3 includes end clamping plates 25 and membrane reaction units 26. Multiple groups of membrane reaction units 26 are stacked and arranged between the two end clamping plates 25 and are connected and fixed into an integral body by multiple groups of bolts 27. The anolyte inlet pipe 28, the anolyte outlet pipe 29, the catholyte inlet pipe 30, and the catholyte outlet pipe 31 are all located on the same end clamping plate 25. The anolyte inlet pipe 28 and the catholyte inlet pipe 30 both enter from a lower position, and the anolyte outlet pipe 29 and the catholyte outlet pipe 31 exit from a higher position, which can expel the air in the flow channel to the greatest extent and improve the uniformity of the electrolytic reaction.

[0034] See Figures 4-7 , the membrane reaction unit includes a bipolar current collector electrode plate 11, an anode plate 12, a cathode plate 13, and a separator 14. An anode plate 12 is provided on one side of the bipolar current collector electrode plate 11, and a cathode plate 13 is provided on the other side. Separators 14 are respectively provided on the outer sides of the anode plate 12 and the cathode plate 13. A gasket 10 is provided between the bipolar current collector electrode plate 11 and the separator 14; each of the two side surfaces of the bipolar current collector electrode plate 11 is provided with an electrode area for placing electrodes, and each of the four corners of the plate body is provided with a liquid flow hole 15. Liquid flow guiding platforms 22 are respectively provided on the liquid flow holes 15. The two liquid flow guiding platforms 22 at the diagonal positions on the same side surface have the same structure and are symmetrically arranged. A through hole 23 is provided on the side of the liquid flow guiding platform, and the through hole 23 is communicated with the total guiding groove 17 in the electrode area. A ring groove 24 is provided on the surface of the liquid flow guiding platform 22. A diversion groove is provided in the electrode area. The diversion groove includes two mutually parallel total guiding grooves 17 and a sub-guiding groove 18 connecting the two total guiding grooves 17. Two sealing groove bands 19 are provided on the surface of the plate body outside the liquid flow hole 15.

[0035] A pressure balance hole 16 is provided in the center of the electrode area of the bipolar current collector electrode plate 11. A pressure bearing platform 20 is provided around the pressure balance 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 surface of the plate body, and the ring groove 24 on the surface of the liquid flow guiding platform are all correspondingly located on both sides of the bipolar current collector electrode plate 11. After multiple groups of membrane reaction units are stacked in sequence, both ends are closed by end clamping plates and are connected by long bolts to form an electrolytic cell stack in the production of a vanadium redox flow battery or its electrolyte. After the long bolts are tightened, the gasket 10 is compressed and deformed to fill the sealing groove band 19, the sealing groove 21, and the ring groove 24, thereby realizing sealing. A bolt is also installed in the pressure balance hole 16 to balance the deformation caused by the tightening force of other bolts, so that the overall structure of the cell stack device remains stable. The balanced clamping effect is beneficial to improving the uniformity of the liquid flow in the membrane reaction unit and reducing internal leakage. The present invention uses the pressure balance hole 16 to make the clamping pressure of the bipolar current collector electrode plate 11 more balanced after stacking, so that the bipolar current collector electrode plate 11 can be thinned to the greatest extent, thereby effectively reducing the size after the plate sheets are stacked, achieving a larger current density under the same cell stack volume, and further improving the efficiency of the production of the vanadium redox flow battery electrolyte.

[0036] Both the anode plate 12 and the cathode plate 13 are carbon felt or graphite felt. These materials have good electrical conductivity and chemical stability and can withstand the chemical reactions generated during the charge and discharge process of the battery. The porous structure of carbon felt and graphite felt is beneficial to the penetration of the electrolyte and the diffusion of ions, thereby improving the energy conversion efficiency of the battery. In addition, these materials also have a relatively high specific surface area, providing more active sites for the electrochemical reaction.

[0037] The separator 14 is a perfluorosulfonic acid type ion exchange membrane of DuPont Company. This is a strong acid type ion exchange membrane with good hydrophilicity. The membrane has a high water content and a low membrane resistance. Since the concentration of fixed ions in the membrane is low, the repulsive force on hydroxide ions is small, and it has good chemical stability during electrolysis in an acidic solution. The Nafion membrane is its representative product. Openings are respectively provided at the positions of the separator 14 corresponding to the liquid flow holes 15 and the pressure balance holes 16, which does not affect the sealing when adjacent membrane reaction units are connected.

[0038] In the embodiment, at least two of the anode liquid inlet pipe 28, the anode liquid outlet pipe 29, the cathode liquid inlet pipe 30, and the cathode liquid outlet pipe 31 may be provided at the position on one end splint 25 corresponding to the liquid flow hole 15, as long as the anode electrolyte and the cathode electrolyte can flow under the minimum liquid resistance.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient preparation method for an all-vanadium liquid flow battery electrolyte, comprising a cathode liquid storage tank, a cathode pump, an anode liquid storage tank, an anode pump and a header type electrolysis device, characterized in that: The container-type electrolysis device comprises a container, a cooling fan, an electrolytic cell stack and an electrolytic power supply. Two groups of electrolytic cell stacks are arranged side by side in the container, and the two groups of electrolytic cell stacks are connected to the electrolytic power supply through cables. Windows are respectively arranged at the top of the container corresponding to the positions of the two groups of electrolytic cell stacks, and covers are arranged on the windows; two groups of double doors are arranged on one side of the container, and locks are arranged on the double doors; an inlet and outlet pipe connection seat is arranged on the rear side of the container; ventilation holes are respectively arranged on the left and right sides of the container, and cooling fans are installed inside the ventilation holes, and a power supply terminal is arranged on the box board on the left or right side of the container; The electrolytic stack comprises an end clamp and a membrane reaction unit, a plurality of groups of membrane reaction units are stacked and arranged between the two end clamps and connected and fixed by a plurality of groups of bolts, the membrane reaction unit comprises a bidirectional current collecting electrode plate, an anode plate, a cathode plate and a diaphragm, an electrode area for placing electrodes is provided on each of the two side surfaces of the bidirectional current collecting electrode plate, a liquid flow hole is provided at each of the four corners of the plate body, a flow guide groove is provided in the electrode area, an anode plate is provided on one side of the bidirectional current collecting electrode plate, a cathode plate is provided on the other side, a diaphragm is provided on the outer side of the anode plate and / or the outer side of the cathode plate, and a current collecting electrode plate and a diaphragm are provided between the bidirectional current collecting electrode plate and the diaphragm. Sealing pad; a pressure balance hole is provided in the center of the electrode area of ​​the bidirectional current collecting electrode plate, a pressure bearing platform is provided around the pressure balance hole, and an annular sealing groove is provided on the pressure bearing platform; liquid flow guide platforms are respectively provided on the liquid flow holes, and the two liquid flow guide platforms at diagonal positions on the same side surface have the same structure, and a through hole is provided on the side of the liquid flow guide platform, which is connected to the guide groove groove in the electrode area, and an annular groove is provided on the surface of the liquid flow guide platform; at least two of the anode liquid inlet pipe, the anode liquid outlet pipe, the cathode liquid inlet pipe, and the cathode liquid outlet pipe are provided at the position corresponding to the liquid flow hole on the one end clamping plate; The anode liquid inlet pipes of the two groups of electrolytic stacks are both connected to the anode pump, the anode liquid outlet pipes are both connected to the anode liquid storage tank, the cathode liquid inlet pipes are both connected to the cathode pump, and the cathode liquid outlet pipes are both connected to the cathode liquid storage tank, wherein the anode liquid outlet pipe of the first group of electrolytic stacks is connected to the anode liquid inlet pipe of the second group of electrolytic stacks through an anode process switching pipe, and a pneumatic three-way ball valve is provided at the cross-connection of the pipes; the cathode liquid outlet pipe of the first group of electrolytic stacks is connected to the cathode liquid inlet pipe of the second group of electrolytic stacks through a cathode process switching pipe, and a pneumatic three-way ball valve is also provided at the cross-connection of the pipes.

2. The method for efficiently preparing an all-vanadium redox flow battery electrolyte according to claim 1, characterized in that: The anode plate and the cathode plate are both carbon felt or graphite felt.

3. The method for efficiently preparing an all-vanadium redox flow battery electrolyte according to claim 1, characterized in that: The diaphragm is a perfluorosulfonic acid ion exchange membrane produced by DuPont.

4. The method for efficiently preparing an all-vanadium redox flow battery electrolyte according to claim 1, characterized in that: An end clamping plate is provided with an anode liquid inlet pipe, an anode liquid outlet pipe, a cathode liquid inlet pipe and a cathode liquid outlet pipe.

5. The method for efficiently preparing an all-vanadium redox flow battery electrolyte according to claim 1, characterized in that: The guide groove includes two mutually parallel main guide grooves and a branch guide groove connecting the two main guide grooves; two circles of sealing groove belts are arranged around the bidirectional current collecting electrode plate outside the liquid flow hole; the sealing groove on the pressure platform, the sealing groove belt on the surface of the plate body and the annular groove on the surface of the liquid flow guide platform are all correspondingly located on both sides of the bidirectional current collecting electrode plate.

6. The method for efficiently preparing an all-vanadium redox flow battery electrolyte according to claim 1, characterized in that: The diaphragm is provided with openings at positions corresponding to the liquid flow holes and the pressure balance holes.

7. The method for efficiently preparing an all-vanadium redox flow battery electrolyte according to claim 1, characterized in that: The top four corners of the container are respectively provided with lifting rings; There is a filter on the vent.

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