Novel liquid storage tank for all-vanadium redox flow battery energy storage system

Abstract

The utility model belongs to the technical field of redox flow batteries, and particularly relates to a novel liquid storage tank for an all-vanadium redox flow battery energy storage system, which comprises a liquid storage tank body, the liquid storage tank body is of an integrated structure, a partition plate is arranged in the liquid storage tank body, and the interior of the liquid storage tank body is divided into a positive electrode electrolyte area and a negative electrode electrolyte area by the partition plate. Liquid inlets are formed in the top ends of the positive electrode electrolyte region and the negative electrode electrolyte region, and liquid outlets and pipeline assemblies are arranged at the bottom ends of the positive electrode electrolyte region and the negative electrode electrolyte region; the positive electrolyte and the negative electrolyte are stored in the same liquid storage tank through the partition plate, the occupied area and the manufacturing cost are effectively reduced, the pipeline assembly can improve the space utilization rate in the tank body, the time for the electrolyte to flow into the total liquid in the tank body is prolonged, the electrolyte is promoted to flow more uniformly, the effective heat dissipation area and the heat dissipation efficiency of the electrolyte are improved, and the service life of the battery is prolonged. And the design of the integrated liquid storage tank is particularly suitable for a small energy storage system.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid flow batteries, and in particular relates to a novel liquid storage tank for an all-vanadium liquid flow battery energy storage system. Background Art

[0002] All-vanadium liquid flow battery is a new type of high-efficiency electric energy conversion and storage device. Since its battery output power and energy storage capacity are independent of each other, it is particularly suitable for large-capacity energy storage reactions such as wind power, solar power and other renewable energy power generation and grid peak regulation. It is mainly composed of a battery stack, electrolyte, inverter, intelligent control, liquid storage tank and pipeline transportation system.

[0003] The liquid storage tank is an important part of the liquid flow battery energy storage system. The liquid storage tank stores positive and negative electrolytes respectively. The positive and negative active materials of the vanadium battery exist in the positive and negative electrolytes respectively. The power of the energy storage system depends only on the size of the battery stack, and the capacity depends on the electrolyte reserves and concentration. In the traditional all-vanadium liquid flow battery energy storage system, an energy storage module consists of at least one positive tank and one negative tank, which are separated and occupy a large area and have low space utilization. In addition, during the operation of the all-vanadium battery, heat will be generated, which will cause the temperature of the liquid storage tank to gradually rise, posing a safety hazard. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a new liquid storage tank for an all-vanadium liquid flow battery energy storage system, which adopts an integrated design to solve the problems of the existing liquid storage tanks having a large footprint, low space utilization, and low heat dissipation efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Provided is a new type of liquid storage tank for an all-vanadium liquid flow battery energy storage system, comprising a liquid storage tank body, the liquid storage tank body is an integrated structure, a partition is arranged inside the liquid storage tank body, and the partition divides the inside of the liquid storage tank body into a positive electrode electrolyte area and a negative electrode electrolyte area;

[0007] The top of the positive electrode electrolyte area and the negative electrode electrolyte area are both provided with a liquid inlet, and the bottom of the positive electrode electrolyte area and the negative electrode electrolyte area are both provided with a liquid outlet and a pipeline assembly;

[0008] The pipeline assembly comprises a vertical branch pipe and an annular coil arranged below the branch pipe, and a support member is arranged below the annular coil.

[0009] The beneficial effects of adopting the above technical solution are as follows: the liquid storage tank adopts a spiral winding process and is formed in one step, which can effectively reduce the manufacturing cost, and the tank body is divided into a positive electrolyte area and a negative electrolyte area by a partition, which effectively reduces the footprint of the liquid flow battery energy storage system; during operation, the positive electrolyte and the negative electrolyte are respectively injected into the positive electrolyte area and the negative electrolyte area from the liquid inlet, and the liquid outlet helps to discharge the electrolyte in the tank, and the pipeline assembly can effectively utilize the internal space of the positive electrolyte area and the negative electrolyte area, thereby improving the space utilization rate inside the liquid storage tank, and can prolong the time for the positive and negative electrolytes to merge into the total liquid in the tank body, increase the effective heat dissipation area of ​​the electrolyte, promote more uniform electrolyte flow, and improve the overall heat dissipation efficiency of the liquid storage tank, and is particularly suitable for the design and use of small energy storage systems.

[0010] Furthermore, liquid outlet holes are arranged on the surfaces of the annular coil and the branch pipe.

[0011] The beneficial effect of adopting the above technical solution is that by setting the liquid outlet hole, the electrolyte in the positive electrolyte area and the negative electrolyte area can be mixed and flowed more evenly, avoiding the return of liquid in the tank to generate bubbles, and improving the safety of the tank.

[0012] Furthermore, a detection instrument area is arranged on one side of the liquid inlet, and the detection instrument area includes a reflux port, a solenoid valve port and a thermometer port which are symmetrically arranged.

[0013] The beneficial effects of adopting the above technical solution are: the detection instrument area can respectively monitor the electrolyte in the positive electrode electrolyte area and the negative electrode electrolyte area in real time, the reflux port is conducive to the mixing and flow of the electrolyte in the tank, and a thermometer is installed in the thermometer port to monitor the temperature in the tank.

[0014] Furthermore, the reflux port is connected to the top end of the branch pipe via a flange.

[0015] The beneficial effects of adopting the above technical solution are: by connecting the reflux port with the branch pipe, it is beneficial to the mixing and flow of the electrolyte in the tank, and it can avoid the generation of bubbles by the return liquid in the tank, thereby improving the safety of the tank body. At the same time, it can extend the time for the positive and negative electrode electrolytes to merge into the total liquid in the tank body, increase the effective heat dissipation area of ​​the electrolyte, promote more uniform flow of the electrolyte, improve the overall heat dissipation efficiency of the liquid storage tank, and ensure the safe use of the liquid storage tank.

[0016] Furthermore, the detection instrument area is also provided with a pressure release port, and the pressure release port is arranged at the top of the positive electrode electrolyte area.

[0017] The beneficial effects of adopting the above technical solution are: the pressure release port can release the gas generated during operation, avoiding the continuous accumulation of gas in the positive electrode electrolyte area and causing excessive gas pressure in the tank, thereby improving the safety of the liquid storage tank.

[0018] Furthermore, the detection instrument area is also provided with a nitrogen inlet, and the nitrogen inlet is arranged at the top of the negative electrode electrolyte area.

[0019] The beneficial effects of adopting the above technical solution are: nitrogen or other inert gases can be introduced into the negative electrode electrolyte area through the nitrogen port to discharge the air in the tank, isolate the negative electrode electrolyte from the air, ensure the atmosphere requirements during the operation of the negative electrode electrolyte, and avoid vanadium ions in the negative electrode electrolyte being oxidized by air and causing capacity loss.

[0020] Furthermore, a first air pressure balance port is provided at the top of the positive electrode electrolyte region, and a second air pressure balance port is provided at the top of the negative electrode electrolyte region. The second air pressure balance port is connected to the first air pressure balance port through an air phase communicating tube.

[0021] The beneficial effect of adopting the above technical solution is: through the air pressure balance port and the air connection pipe at the top of the positive electrolyte area and the negative electrolyte area, the air pressure balance in the liquid storage tank can be achieved, the air pressure in the tank is avoided to be too high, and the safety of the liquid storage tank is improved.

[0022] Furthermore, a first liquid level balance port is provided on the side of the tank body of the positive electrode electrolyte area, and a second liquid level balance port is provided on the side of the tank body of the negative electrode electrolyte area. The second liquid level balance port is connected to the first liquid level balance port through a liquid phase communication pipe.

[0023] The beneficial effect of adopting the above technical solution is that liquid phase balance in the liquid storage tank can be achieved through the liquid level balance port and the liquid connection pipe on the side of the tank body of the positive electrode electrolyte area and the negative electrode electrolyte area.

[0024] Furthermore, an upper liquid level gauge port and a lower liquid level gauge port are provided on the sides of the tank bodies of the positive electrolyte area and the negative electrolyte area. The upper liquid level gauge port is close to the top of the tank body, and the lower liquid level gauge port is close to the bottom of the liquid storage tank. The lower liquid level gauge port and the upper liquid level gauge port are connected by a connecting pipe.

[0025] The beneficial effect of adopting the above technical solution is that the liquid levels of the positive electrolyte area and the negative electrode liquid area in the liquid storage tank can be monitored in real time through the upper liquid level gauge port, the lower liquid level gauge port and the transparent connecting pipe to ensure safe and stable production.

[0026] Furthermore, the materials of the liquid storage tank body and the partition are both corrosion-resistant materials.

[0027] The beneficial effects of adopting the above technical solution are: the liquid storage tank and the partition are made of corrosion-resistant materials such as polypropylene, which have high plasticity, tensile strength and corrosion resistance, can extend the service life of the liquid storage tank and reduce production costs.

[0028] In summary, the novel liquid storage tank for the all-vanadium liquid flow battery energy storage system provided by the utility model has the following beneficial effects:

[0029] (1) The liquid storage tank in the utility model adopts an integrated design, which is particularly suitable for small energy storage systems. The liquid storage tank is divided into a positive electrode electrolyte area and a negative electrode electrolyte area by a partition, and the positive and negative electrode electrolytes are stored in the same liquid storage tank, which effectively reduces the floor space and manufacturing costs.

[0030] (2) The bottom of the positive electrode electrolyte area and the negative electrode electrolyte area in the utility model are both provided with pipeline components, which can effectively utilize the internal space of the tank body, improve the space utilization rate in the tank, and prolong the time for the electrolyte to merge into the total liquid in the tank body, so as to promote the electrolyte to flow more evenly and improve the effective heat dissipation area and heat dissipation efficiency of the electrolyte; in addition, the liquid outlet holes arranged on the surface of the annular coil and the branch pipe can make the electrolyte mix and flow more evenly, avoid the generation of bubbles by the liquid backflow in the tank, and improve the safety of the tank body.

[0031] (3) The detection instrument area in the utility model is provided with different detection instruments, which can maintain the balance of the gas phase and liquid phase in the positive and negative electrode electrolyte areas. At the same time, it can also realize real-time monitoring of the internal temperature and liquid level of the tank body to ensure the safe use of the liquid storage tank.

[0032] (4) The positive electrode electrolyte area in the utility model is provided with a pressure release port, which can release the gas generated during operation, avoid continuous accumulation of gas and cause excessive pressure in the tank, and ensure the safe use of the liquid storage tank.

[0033] (5) In the utility model, the negative electrode electrolyte area is provided with a nitrogen port, which can be used to introduce inert gas such as nitrogen to discharge the air in the tank, isolate the negative electrode electrolyte from the air, ensure the atmosphere requirements during the operation of the negative electrode electrolyte, and avoid the vanadium ions in the negative electrode electrolyte being oxidized by air and causing capacity loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the utility model;

[0035] Figure 2 It is a top view of the utility model.

[0036] Among them, 1. liquid storage tank body; 2. partition; 3. positive electrode electrolyte area; 4. negative electrode electrolyte area; 5. liquid inlet; 6. liquid outlet; 7. pipeline assembly; 71. branch pipe; 72. annular coil; 73. support; 74. liquid outlet; 8. detection instrument area; 81. reflux port; 82. solenoid valve port; 83. thermometer port; 84. pressure release port; 85. nitrogen port; 86. first air pressure balance port; 87. second air pressure balance port; 88. first liquid level balance port; 89. second liquid level balance port; 9. upper liquid level gauge port; 10. lower liquid level gauge port. DETAILED DESCRIPTION

[0037] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0038] like Figure 1 As shown, the utility model provides a new liquid storage tank for an all-vanadium liquid flow battery energy storage system, including a liquid storage tank body 1, which is an integrated structure, and a partition 2 is arranged inside the liquid storage tank body 1, and the partition 2 divides the inside of the liquid storage tank body 1 into a positive electrode electrolyte area 3 and a negative electrode electrolyte area 4; the liquid storage tank adopts a spiral winding process, is formed in one step, and the partition 2 divides a liquid storage tank into a positive electrode electrolyte area 3 and a negative electrode electrolyte area 4, that is, the positive and negative electrolyte tank bodies are composed of a liquid storage tank, which effectively reduces the floor space of the liquid storage tank, reduces the production cost, and is particularly suitable for small energy storage systems.

[0039] In the embodiment of the utility model, the liquid storage tank body 1 is set to be square or round, and the materials of the liquid storage tank body 1 and the partition 2 are both corrosion-resistant materials; the specific corrosion-resistant material is polypropylene, etc., which has high plasticity, tensile strength and corrosion resistance, can extend the service life of the liquid storage tank and reduce production costs.

[0040] In the embodiment of the present utility model, Figure 1 and Figure 2 As shown, the top of the positive electrolyte area 3 and the negative electrolyte area 4 are both provided with a liquid inlet 5, and the bottom thereof are both provided with a liquid outlet 6 and a pipeline assembly 7; during operation, the electrolyte can be injected into the positive electrolyte area 3 and the negative electrolyte area 4 respectively from the liquid inlet 5, the liquid outlet 6 can discharge the electrolyte in the tank, and the pipeline assembly 7 can effectively utilize the internal space of the positive electrolyte area 3 and the negative electrolyte area 4, prolong the time for the positive and negative electrolytes to merge into the total liquid in the tank body, increase the effective heat dissipation area of ​​the electrolyte, promote more uniform electrolyte flow, and improve the overall heat dissipation efficiency of the liquid storage tank.

[0041] In the embodiment of the present utility model, Figure 1 As shown, the pipeline assembly 7 includes a vertical branch pipe 71 and an annular coil 72 arranged below the branch pipe 71, and a support member 73 is arranged below the annular coil 72; the support member 73 can support the pipeline assembly 7, improve the stability of the pipeline assembly 7 inside the liquid storage tank, and at the same time, can leave a certain space between the annular coil 72 and the bottom of the liquid storage tank, which is conducive to heat dissipation, and the design of the annular coil 72 can effectively utilize the internal space of the liquid storage tank, prolong the time for the electrolyte to flow into the liquid storage tank, and further improve the heat dissipation efficiency.

[0042] In the embodiment of the present utility model, Figure 1 As shown, the surfaces of the annular coil 72 and the branch pipe 71 are both provided with liquid outlet holes 74; the liquid outlet holes 74 can make the electrolytes in the positive electrode electrolyte area 3 and the negative electrode electrolyte area 4 mix and flow more evenly, avoid bubbles generated by liquid backflow in the tank, and improve operation safety.

[0043] In the embodiment of the present utility model, Figure 2 As shown, a detection instrument area 8 is provided on one side of the liquid inlet 5 of the positive electrolyte area 3 and the negative electrolyte area 4; by arranging different detection instruments in the detection instrument area 8, the detection requirements under different production conditions can be met, which is conducive to real-time understanding of the operating status.

[0044] In the embodiment of the present utility model, Figure 1 As shown, the detection instrument area 8 includes a symmetrically arranged reflux port 81, a solenoid valve port 82, and a thermometer port 83; the reflux port 81 is conducive to the mixing and flow of the electrolyte in the tank, and a thermometer is installed in the thermometer port 83 to monitor the temperature in the tank.

[0045] In the embodiment of the utility model, the reflux port 81 is connected to the top of the branch pipe 71 by a flange; by connecting the reflux port 81 to the branch pipe 71, the mixing and flow of the electrolyte in the tank are facilitated, and bubbles generated by the return liquid in the tank can be avoided, thereby improving the safety of the tank body. At the same time, it can extend the time for the positive and negative electrode electrolytes to merge into the total liquid in the tank body, increase the effective heat dissipation area of ​​the electrolyte, promote a more uniform flow of the electrolyte, and improve the overall heat dissipation efficiency of the liquid storage tank.

[0046] In the embodiment of the present utility model, Figure 2 As shown, a pressure release port 84 is also provided at the top of the positive electrolyte region 3, which can release the gas generated during operation, avoid continuous accumulation of gas in the positive electrolyte region 3 and cause excessive pressure in the tank, and ensure safe use.

[0047] In the embodiment of the present utility model, Figure 2 As shown, a nitrogen inlet 85 is also provided at the top of the negative electrode electrolyte area 4. Nitrogen or other inert gas is introduced into the negative electrode electrolyte area 4 through the nitrogen inlet 85 to discharge the air in the tank, isolate the negative electrode electrolyte from the air, ensure the atmosphere requirements during the operation of the negative electrode electrolyte, and avoid vanadium ions in the negative electrode electrolyte being oxidized by air and causing capacity loss.

[0048] In the embodiment of the utility model, a first air pressure balance port 86 is provided at the top of the positive electrolyte region 3, and a second air pressure balance port 87 is provided at the top of the negative electrolyte region 4, and the second air pressure balance port 87 is connected to the first air pressure balance port 86 through an air-phase connecting pipe; during operation, the air pressure balance ports and the air-phase connecting pipes at the tops of the positive electrolyte region 3 and the negative electrolyte region 4 can achieve air pressure balance in the liquid storage tank, avoid excessive air pressure in the tank, and improve the safety of the liquid storage tank.

[0049] In the embodiment of the present utility model, Figure 2 As shown, a first liquid level balance port 88 is provided on the side of the tank body of the positive electrolyte zone 3, and a second liquid level balance port 89 is provided on the side of the tank body of the negative electrolyte zone 4. The second liquid level balance port 89 is connected to the first liquid level balance port 88 through a liquid phase connecting pipe; during operation, the liquid phase balance in the liquid storage tank can be achieved through the liquid level balance ports and liquid phase connecting pipes on the sides of the tank bodies of the positive electrolyte zone 3 and the negative electrolyte zone 4.

[0050] In the embodiment of the present utility model, Figure 1 As shown, an upper liquid level gauge port 9 and a lower liquid level gauge port 10 are provided on the sides of the tank bodies of the positive electrode electrolyte zone 3 and the negative electrode electrolyte zone 4, the upper liquid level gauge port 9 is close to the top of the tank body, the lower liquid level gauge port 10 is close to the bottom of the liquid storage tank, and the lower liquid level gauge port 10 and the upper liquid level gauge port 9 are connected by a connecting pipe; during operation, the connecting pipe is made of transparent material, which can monitor the liquid levels of the positive electrode electrolyte zone 3 and the negative electrode electrolyte zone 4 in the liquid storage tank in real time to ensure safe and stable production.

[0051] In summary, the new liquid storage tank for the all-vanadium liquid flow battery energy storage system provided by the utility model is particularly suitable for the operation of a small energy storage system. By storing the positive and negative electrolytes in the same liquid storage tank, the floor space and manufacturing cost are effectively reduced; at the same time, the pipeline assembly 7 at the bottom of the positive and negative electrolyte areas 4 can effectively utilize the internal space of the tank body, improve the utilization rate of the space in the tank, and prolong the time for the electrolyte to merge into the total liquid in the tank body, thereby promoting a more uniform flow of the electrolyte and improving the effective heat dissipation area and heat dissipation efficiency of the electrolyte.

Claims

1. A new type of liquid storage tank for all-vanadium liquid flow battery energy storage system, characterized by: The liquid storage tank body (1) comprises a liquid storage tank body (1) which is an integrated structure and has a partition (2) arranged inside the liquid storage tank body. The partition (2) divides the inside of the liquid storage tank body (1) into a positive electrode electrolyte area (3) and a negative electrode electrolyte area (4); The positive electrode electrolyte region (3) and the negative electrode electrolyte region (4) are both provided with a liquid inlet (5) at the top, and a liquid outlet (6) and a pipeline assembly (7) at the bottom; The pipeline assembly (7) comprises a vertical branch pipe (71) and an annular coil (72) arranged below the branch pipe (71), and a support member (73) is arranged below the annular coil (72).

2. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 1 is characterized in that: Liquid outlet holes (74) are provided on the surfaces of the annular coil (72) and the branch pipe (71).

3. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 1 is characterized in that: A detection instrument area (8) is provided on one side of the liquid inlet (5), and the detection instrument area (8) comprises a symmetrically arranged reflux port (81), a solenoid valve port (82) and a thermometer port (83).

4. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 3 is characterized in that: The reflux port (81) is connected to the top end of the branch pipe (71) via a flange.

5. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 3 is characterized in that: The detection instrument area (8) is also provided with a pressure release port (84), and the pressure release port (84) is arranged at the top of the positive electrode electrolyte area (3).

6. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 3 is characterized in that: The detection instrument area (8) is also provided with a nitrogen port (85), and the nitrogen port (85) is arranged at the top of the negative electrode electrolyte area (4).

7. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 1 is characterized in that: The top of the positive electrode electrolyte region (3) is provided with a first air pressure balance port (86), and the top of the negative electrode electrolyte region (4) is provided with a second air pressure balance port (87), and the second air pressure balance port (87) is connected to the first air pressure balance port (86) through an air phase communication tube.

8. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 7 is characterized in that: A first liquid level balance port (88) is provided on the side of the tank body of the positive electrode electrolyte zone (3), and a second liquid level balance port (89) is provided on the side of the tank body of the negative electrode electrolyte zone (4), and the second liquid level balance port (89) is connected to the first liquid level balance port (88) via a liquid phase communication pipe.

9. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 8 is characterized in that: The sides of the tank bodies of the positive electrode electrolyte zone (3) and the negative electrode electrolyte zone (4) are both provided with an upper liquid level gauge port (9) and a lower liquid level gauge port (10), wherein the upper liquid level gauge port (9) is close to the top of the tank body, and the lower liquid level gauge port (10) is close to the bottom of the liquid storage tank, and the lower liquid level gauge port (10) and the upper liquid level gauge port (9) are connected via a connecting pipe.

10. The novel liquid storage tank for the all-vanadium liquid flow battery energy storage system according to claim 1 is characterized in that: The liquid storage tank body (1) and the partition plate (2) are both made of corrosion-resistant materials.

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