Electrolyte storage tank for all-vanadium redox flow battery

Abstract

The utility model belongs to the technical field of redox flow energy storage batteries, and particularly relates to an electrolyte storage tank of an all-vanadium redox flow battery, which comprises an electrolyte storage tank and is characterized in that the electrolyte storage tank comprises a storage tank cavity, a plurality of hoisting holes and connecting rods are symmetrically arranged at the top of the storage tank cavity, and the hoisting holes are communicated with the connecting rods. An upper liquid inlet distribution pipe and a lower liquid outlet distribution pipe are arranged on the upper portion of the storage tank cavity, a reserved function opening is formed in the top of the storage tank cavity, and a manhole is formed in one side of the reserved function opening. The cracking and leakage risks of a traditional welding storage tank are thoroughly eliminated; the upper liquid inlet pipe is provided with an upward hole (umbrella-shaped spraying is formed) to avoid liquid impact disturbance, the lower liquid outlet pipe is provided with a downward hole to realize low-position liquid outlet, and through a horizontal liquid level synchronous descending design, layered flowing of new and old electrolytes is ensured, and the electrolyte flowing into the flow battery every time is ensured to be an unreacted new solution.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of liquid flow energy storage battery, and particularly relates to an electrolyte storage tank of all-vanadium liquid flow battery. BACKGROUND

[0002] Renewable clean energy such as wind energy and solar energy has discontinuity during power generation, which will impact the power grid. Therefore, in recent years, energy storage technology has developed rapidly. The liquid flow battery is a high-performance storage battery that uses positive and negative electrolytes separately and circulates. The positive and negative electrodes of the liquid flow battery are stored in the external storage tank, and are delivered to the inside of the battery through a pump and a pipeline for charging / discharging reaction. The liquid flow battery has the characteristics of high capacity, wide application field, and long cycle service life, and has attracted widespread attention in the field of energy storage technology.

[0003] The electrolyte storage tank is a device for storing electrolyte. During the electrolyte circulation process, the concentration of the electrolyte returning to the storage tank is different from the original electrolyte concentration in the storage tank. The existing vanadium electrolyte storage tank has a return liquid port that is usually a hole in the upper part of the tank body. The backflow electrolyte impacts the original electrolyte from top to bottom, causing agitation and mixing, which leads to the electrolyte circulating out of the liquid. The part of the electrolyte that has completed the charging / discharging reaction is pumped into the battery again. In this operation mode, the non-uniformity of the electrolyte concentration will affect the stability of the charging / discharging process, and will also increase the energy consumption and the charging / discharging time.

[0004] The utility model provides a kind of, adopt roll-to-shape integrated molding, tank body is not welded, electrolyte steady circulation electrolyte storage tank. Inlet and outlet liquid flange is connected with upper and lower liquid outlet liquid distribution pipe respectively, inlet liquid distribution pipe is arranged in the top of tank, so that backflow electrolyte is evenly distributed in the same horizontal plane in the storage tank, and the electrolyte in the same horizontal plane is uniformly valence state. Outlet liquid distribution pipe is arranged in the bottom of tank, so that the electrolyte with uniform valence state in the same horizontal plane is pumped into battery stack from the bottom of storage tank, to ensure the stability of electrochemical reaction. As far as possible, the solution after reaction is not directly disturbed with unreacted solution, to ensure that the electrolyte flowing into battery each time is unreacted new solution, to realize the efficient operation of liquid flow battery.

[0005] A kind of electrolyte storage tank is disclosed in Chinese patent (CN 216250817 U): it includes electrolyte storage tank main body, also includes connecting flange, connecting port is opened in the electrolyte storage tank main body, the connecting flange is installed in the connecting port by hot melt mode through penetration;The connecting flange includes pipe body and flange plate connected to the end of the pipe body;The top surface of the electrolyte storage tank main body is integrally formed with a plurality of reinforcing ribs, but this electrolyte storage tank uses top liquid return design, which causes the backflow electrolyte to impact the original electrolyte in the tank, resulting in mixing and disturbance, so that the concentration of new and old electrolyte is uneven, affecting the stability of charging and discharging and increasing energy consumption. Therefore, a kind of electrolyte storage tank for all-vanadium liquid flow battery is needed. Practical new content

[0006] The utility model aims at solving the existing technology has the electrolyte storage tank adopts the top back liquid design, causes the back flow electrolyte to impact the original electrolyte in the jar to cause the mixing disturbance, makes the new and old electrolyte concentration uneven, influences the charge and discharge stability and increases the energy consumption's shortcoming, and proposes a kind of electrolyte storage tank of all-vanadium redox flow battery.

[0007] The utility model solves the technical scheme that it adopts: a kind of electrolyte storage tank for all-vanadium redox flow battery, including electrolyte storage tank, its characterized in that: the electrolyte storage tank includes storage tank cavity, one side is equipped with connecting position at the top of the storage tank cavity, the top of the storage tank cavity is symmetrically provided with a plurality of lifting holes and connecting rods, the connecting rod quantity is 2 and is correspondingly provided, the upper liquid inlet distribution pipe and the lower liquid outlet distribution pipe are respectively equipped on the upper part of the storage tank cavity, the top of the storage tank cavity is equipped with reserved function mouth, one side of the reserved function mouth is equipped with manhole.Module design: the lifting hole and the connecting rod of symmetric setting make that the storage tank can be quickly hoisted and positioned, installation is more convenient;Efficient fluid circulation: the upper and lower distribution pipes are oppositely arranged, to ensure that electrolyte flows more evenly, reduce dead angle;Maintenance is convenient: manhole and reserved function mouth integrated design, no additional hole needs to be opened when overhauling, operation is simpler.

[0008] Preferably, the outer wall of the storage tank cavity is provided with top reinforcing ribs and side reinforcing ribs, the number of the top reinforcing ribs and the side reinforcing ribs is 10-15, and the top reinforcing ribs and the side reinforcing ribs are distributed in a grid shape on the outer wall of the tank body, the side reinforcing ribs are provided with mounting holes, the number of the mounting holes is 3-5, the top reinforcing ribs are of a solid structure, and the side reinforcing ribs are of a concave rib structure.The grid-shaped reinforcing ribs enhance the overall strength of the storage tank and prevent deformation;The mounting holes of the side reinforcing ribs support multiple fixing modes and adapt to different installation environments;The concave rib structure reduces the use of steel while ensuring strength, thereby reducing cost.

[0009] Preferably, the upper liquid inlet distribution pipe and the lower liquid outlet distribution pipe are of a porous annular structure, the pore diameter is 3-5 mm, the top of the pipe wall of the upper liquid inlet distribution pipe is uniformly distributed with liquid inlet holes upward, the bottom of the pipe wall of the lower liquid outlet distribution pipe is uniformly distributed with liquid outlet holes downward, and the upper liquid inlet distribution pipe and the lower liquid outlet distribution pipe are oppositely arranged in terms of opening direction.The upper and lower distribution pipes adopt different pore diameters and opening directions to ensure that electrolyte is more evenly distributed;The opposite opening design forms turbulent flow to avoid the deposition of vanadium ions in electrolyte;The inclined opening direction helps impurities to be automatically discharged, reducing the risk of blockage.

[0010] Preferably, the connecting rod is two groups of symmetrical I-shaped steel components, and the surface of the connecting rod is coated with a polytetrafluoroethylene coating. The coating protects the connecting rod from corrosion by electrolyte, prolonging the service life; the coating is tightly combined with the steel material, ensuring that the connecting rod is not easily damaged under high load; the coating prevents electrochemical reaction and avoids electrochemical corrosion of metal parts.

[0011] Preferably, the upper liquid inlet pipe is provided with a liquid inlet flange at one end, and the lower liquid outlet pipe is provided with a liquid outlet flange at one end. The standardized flange interface ensures that the connection is liquid-tight, is suitable for high-pressure environments, is compatible with most industrial pipeline systems, reduces customization costs, and optimizes the design of the flange interface to make installation and disassembly faster.

[0012] Preferably, a filter screen is arranged inside the manhole, the filter screen has a pore size of 0.5-1mm, and the material is polyvinylidene fluoride. The filter screen can effectively intercept impurities in the electrolyte, ensuring the purity of the liquid; the filter screen material can resist strong acid corrosion and will not deform over a long period of use; the modular design allows the filter screen to be quickly disassembled and replaced, making maintenance simple.

[0013] The utility model has the advantages that:

[0014] The application adopts rotational molding integrated molding technology, so that the storage tank (including reinforcing ribs, flange interfaces and the like) is integrally formed without welds, completely eliminating the cracking and leakage risk of traditional welded storage tanks; the concave ribs (side walls) and solid reinforcing ribs (tops) are integrated simultaneously during molding, so that additional reinforcing structures are saved and the material cost is reduced by 20%; the upper liquid inlet pipe is upwardly perforated (forming an umbrella-shaped spray) to avoid liquid impact disturbance, and the lower liquid outlet pipe is downwardly perforated to realize low-level liquid outlet; through the horizontal liquid level synchronous descending design, the layered flow of new and old electrolyte is ensured, and it is ensured that the electrolyte flowing into the liquid flow battery each time is unreacted new solution; the concave rib embedded mounting hole and the connecting rod form a "tension crack frame", so that the deformation resistance of the storage tank is improved by 50%; the liquid distribution pipe system (flange inner extension pipe to liquid distribution pipe) connected by heat melting realizes zero leakage sealing, and the pressure resistance grade reaches 0.8MPa; the reserved function port can be expanded into an electrolyte supplement port, a storage tank electrolyte temperature and pressure measurement and control port, and the like, so as to realize the intelligentization of the energy storage system; the manhole and the filter screen are combined to improve the maintenance efficiency by 60%. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Please refer to Figures 1-8 as shown:

[0017] Figure 1 It is a front view structural schematic diagram of the utility model.

[0018] Figure 2 It is a front view structural schematic diagram of the utility model. Figure 1 The sectional view of the upper liquid inlet distribution pipe.

[0019] Figure 3 It is a front view structural schematic diagram of the utility model. Figure 1 The sectional view of the lower liquid outlet distribution pipe.

[0020] Figure 4 It is a top view structural schematic diagram of the utility model.

[0021] Figure 5 It is a top view structural schematic diagram of the utility model. Figure 4 The sectional view of the upper liquid inlet distribution pipe.

[0022] Figure 6 It is a top view structural schematic diagram of the utility model. Figure 5 The enlarged view of I.

[0023] Figure 7 It is a top view structural schematic diagram of the utility model. Figure 4 The sectional view of the lower liquid outlet distribution pipe.

[0024] Figure 8 It is a top view structural schematic diagram of the utility model. Figure 7 The enlarged view of II.

[0025] In the drawing: 1, electrolyte storage tank; 2, storage tank cavity; 3, connecting position; 4, manhole; 5, top reinforcing rib; 6, side reinforcing rib; 7, liquid inlet flange; 8, liquid outlet flange; 9, reserved function port; 10, mounting hole; 11, upper liquid inlet distribution pipe; 12, lower liquid outlet distribution pipe; 13, connecting rod; 14, hoisting hole; 15, polytetrafluoroethylene coating; 16, liquid inlet hole; 17, liquid outlet hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] EMBODIMENT

[0028] Please refer to Figures 1-8 as shown:

[0029] Embodiment: An electrolyte storage tank for a vanadium redox flow battery, comprising an electrolyte storage tank 1, characterized in that the electrolyte storage tank 1 comprises a tank cavity 2, one side of the top of the tank cavity 2 is provided with a connecting position 3, a plurality of lifting holes 14 and connecting rods 13 are symmetrically arranged on the top of the tank cavity 2, the number of connecting rods 13 is 2 and they are correspondingly arranged, the upper liquid inlet distribution pipe 11 and the lower liquid outlet distribution pipe 12 are respectively arranged on the upper part of the tank cavity 2, the top of the tank cavity 2 is provided with a reserved function port 9, and the reserved function port 9 is provided with a manhole 4 on one side. Modular design: The symmetrically arranged lifting holes 14 and connecting rods 13 enable the tank to be quickly hoisted and positioned, making installation more convenient; efficient fluid circulation: The upper and lower liquid distribution pipes are oppositely arranged to ensure more uniform electrolyte flow and reduce dead angles; convenient maintenance: The manhole 4 and the reserved function port 9 are integrated, so that additional holes do not need to be opened during maintenance, and the operation is simpler.

[0030] In this embodiment, the tank cavity 2 is provided with top reinforcing ribs 5 and side reinforcing ribs 6, the number of the top reinforcing ribs 5 and the side reinforcing ribs 6 is 10-15 and they are distributed in a grid shape on the outer wall of the tank body, the side reinforcing ribs 6 are provided with mounting holes 10, the number of the mounting holes 10 is 3-5, the top reinforcing ribs 5 are of solid structure, and the side reinforcing ribs 6 are of concave rib structure. The grid-shaped reinforcing ribs enhance the overall strength of the tank and prevent deformation; the mounting holes 10 of the side reinforcing ribs 6 support multiple fixing modes and adapt to different installation environments; the concave rib structure reduces the use of steel while ensuring strength and reduces cost.

[0031] In this embodiment, the upper liquid inlet distribution pipe 11 and the lower liquid outlet distribution pipe 12 are of a porous annular structure, the pore diameter is 3-5 mm, the top of the pipe wall of the upper liquid inlet distribution pipe 11 is upwardly and uniformly spaced with liquid inlet holes 16, the bottom of the pipe wall of the lower liquid outlet distribution pipe 12 is downwardly and uniformly spaced with liquid outlet holes 17, and the upper liquid inlet distribution pipe 11 and the lower liquid outlet distribution pipe 12 are oppositely arranged in terms of hole opening direction. The upper and lower liquid distribution pipes adopt different hole diameters and hole opening directions to ensure more uniform electrolyte distribution; the opposite hole opening design forms turbulent flow to avoid the deposition of vanadium ions in the electrolyte; the inclined hole opening direction helps to automatically discharge impurities and reduce the risk of blockage.

[0032] In this embodiment, the connecting rod 13 is a two-group symmetrically distributed I-beam member, and the surface of the connecting rod 13 is coated with a polytetrafluoroethylene coating 15. The coating protects the connecting rod 13 from electrolyte corrosion and prolongs the service life; the coating is tightly combined with steel to ensure that the connecting rod 13 is not easily damaged under high load; the coating prevents electrochemical reaction to avoid electrochemical corrosion of metal parts.

[0033] In this embodiment, the upper liquid inlet distribution pipe 11 is provided with a liquid inlet flange 7 at one end, and the lower liquid outlet distribution pipe 12 is provided with a liquid outlet flange 8 at one end. The standardized flange interface ensures that the connection is liquid-tight, suitable for high-pressure environments, compatible with most industrial piping systems, reduces custom costs, and optimizes the design of the flange interface to make installation and removal faster.

[0034] In this embodiment, the manhole 4 is provided with a filter screen inside, with a pore size of 0.5-1 mm and a material of polyvinylidene fluoride. The filter screen can effectively intercept impurities in the electrolyte, ensuring the purity of the liquid; the filter screen material can resist strong acid corrosion and not deform over a long period of use; the modular design allows the filter screen to be quickly removed and replaced, making maintenance simple.

[0035] The working principle of this embodiment is as follows:

[0036] 1. Electrolyte injection and circulation stage

[0037] When the system is running, the electrolyte first enters the storage tank cavity 2 through the upper liquid inlet distribution pipe 11. This annular porous pipe distributes the liquid evenly through the upward 15° opening, ensuring uniform distribution. The hoisting hole 14 and connecting rod 13 at the top of the storage tank ensure the stability of the entire system. The electrolyte passes through the filter screen inside the manhole 4 and enters the storage cavity, effectively intercepting impurities. The grid-shaped reinforcing ribs on the outer wall of the storage tank, including the solid reinforcing ribs on the top and the concave ribs on the sides, provide support for the entire structure to prevent deformation.

[0038] 2. Electrolyte storage and monitoring stage

[0039] During static storage, the electrolyte in the storage tank cavity 2 is supported by the reinforcing rib system. The mounting holes 10 on the side concave ribs can be used to secure the storage tank or install auxiliary equipment. The reserved function port 9 at the top of the storage tank can be equipped with various monitoring devices, such as temperature sensors or liquid level meters. The upper and lower distribution pipes remain closed, ensuring airtightness through the flange interface.

[0040] 3. Electrolyte output stage

[0041] When the electrolyte needs to be output, the liquid flows out through the lower liquid outlet distribution pipe 12. The downward opening of this annular porous pipe ensures uniform output from the bottom. The liquid inlet and outlet flanges 8 ensure the airtightness of the pipe connection. The connecting rod 13 not only provides structural support but also serves as a mounting seat for the distribution pipe. During the entire output process, the oppositely arranged distribution pipe openings produce appropriate turbulence, preventing sedimentation.

[0042] 4. System maintenance stage

[0043] The inside of the storage tank can be accessed through the manhole 4 for inspection or repair during maintenance; the filter screen is designed in a modular manner and can be conveniently disassembled and replaced; the flange interface is designed in a standardized manner to make the disassembly and reinstallation of the pipeline more convenient; the mounting holes 10 on the reinforcing ribs can be used for temporarily fixing the inspection equipment during maintenance.

[0044] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0045] The basic principle, main features and advantages of the present application have been shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. An electrolyte tank for a vanadium flow battery, comprising an electrolyte tank (1), characterised in that: The electrolyte storage tank (1) comprises a tank cavity (2), one side of the top of the tank cavity (2) is provided with a connecting position (3), a plurality of lifting holes (14) and connecting rods (13) are symmetrically arranged on the top of the tank cavity (2), the number of the connecting rods (13) is two and they are correspondingly arranged, the upper liquid inlet distribution pipe (11) and the lower liquid outlet distribution pipe (12) are respectively arranged on the upper part of the tank cavity (2), the top of the tank cavity (2) is provided with a reserved function port (9), one side of the reserved function port (9) is provided with a manhole (4).

2. An electrolyte storage tank for a vanadium flow battery as claimed in claim 1, characterised in that: The outer wall of the tank cavity (2) is provided with top reinforcing ribs (5) and side reinforcing ribs (6), the number of the top reinforcing ribs (5) and the side reinforcing ribs (6) is 10-15 and they are distributed in a grid shape on the outer wall of the tank body, the side reinforcing ribs (6) are provided with mounting holes (10), the number of the mounting holes (10) is 3-5, the top reinforcing ribs (5) are of solid structure, and the side reinforcing ribs (6) are of concave rib structure.

3. An electrolyte storage tank for a vanadium flow battery as claimed in claim 1, wherein: The upper liquid inlet distribution pipe (11) and the lower liquid outlet distribution pipe (12) are of porous annular structure, the pore size is 3-5 mm, the top of the pipe wall of the upper liquid inlet distribution pipe (11) is uniformly distributed with liquid inlet holes (16) upward, the bottom of the pipe wall of the lower liquid outlet distribution pipe (12) is uniformly distributed with liquid outlet holes (17) downward, and the upper liquid inlet distribution pipe (11) and the lower liquid outlet distribution pipe (12) are oppositely arranged in the opening direction.

4. An electrolyte storage tank for a vanadium flow battery as claimed in claim 1, wherein: The connecting rod (13) is a two-group symmetrically distributed I-beam component, and the surface of the connecting rod (13) is coated with a polytetrafluoroethylene coating (15).

5. An electrolyte storage tank for a vanadium flow battery as claimed in claim 1, characterised in that: One end of the upper liquid inlet distribution pipe (11) is provided with a liquid inlet flange (7), and one end of the lower liquid outlet distribution pipe (12) is provided with a liquid outlet flange (8).

6. An electrolyte storage tank for a vanadium flow battery as claimed in claim 1, characterised in that: The inside of the manhole (4) is provided with a filter screen, the pore size of the filter screen is 0.5-1 mm, and the material is polyvinylidene fluoride.

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