Anti-siphon concentration difference balancing device, liquid storage tank and all-vanadium redox flow battery system

Abstract

The utility model discloses an anti-siphoning concentration difference balancing device, a liquid storage tank and an all-vanadium redox flow battery system, and the anti-siphoning concentration difference balancing device comprises a connecting pipe, a liquid inlet pipe, a liquid outlet pipe and a liquid outlet pipe, the liquid collecting tank is fixed on the connecting pipe and is connected with the connecting pipe in a sealing manner; a plurality of air pressure balance holes are formed in the part, positioned in the liquid collecting tank, of the connecting pipe, so that reflux liquid generated by siphoning is collected in the liquid collecting tank; the backflow pipes are arranged at the bottom of the liquid collecting tank and used for enabling backflow liquid collected in the liquid collecting tank to flow back into the liquid storage tank again; the concentration balancing pipe is communicated with the bottom of the connecting pipe, the tail end of the concentration balancing pipe is closed, and a plurality of flow dividing holes are formed in the concentration balancing pipe. According to the utility model, the functions of preventing siphoning and balancing concentration difference can be simultaneously realized without using an exhaust valve and a water distributor which are high in price, so that the production cost is remarkably reduced, and the overall space utilization rate can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, in particular to an anti-siphon concentration difference balancing device, a liquid storage tank and an all-vanadium liquid flow battery system. Background Art

[0002] When the all-vanadium liquid flow battery starts or stops charging and discharging, or when it shuts down due to a malfunction, it will cause electrolyte siphoning, causing impact and damage to the internal parts of the battery stack. At the same time, during the normal charging and discharging process, due to the large volume of the electrolyte in the storage tank, uneven electrolyte circulation will cause electrolyte concentration differences, thereby reducing the working efficiency of the entire battery system.

[0003] In existing all-vanadium liquid flow batteries, a drain valve is usually added to prevent siphoning, and a water distributor is added to balance the electrolyte concentration in the storage tank. However, since both the drain valve and the water distributor will increase the cost of the entire all-vanadium liquid flow battery system and occupy additional space when arranged, how to solve the problem of preventing siphoning and balancing the electrolyte concentration while achieving the goal of reducing the cost of the all-vanadium liquid flow battery and saving space is an urgent problem that needs to be solved. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide an anti-siphon concentration difference balancing device, a liquid storage tank and an all-vanadium liquid flow battery system, which have the advantages of being able to simultaneously achieve anti-siphon and balance electrolyte concentration, and have low cost and space saving.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] According to a first aspect of an embodiment of the present disclosure, there is provided an anti-siphon concentration difference balancing device, comprising:

[0007] A connecting pipe used for fixedly connecting to the liquid inlet of the liquid storage tank;

[0008] A liquid collecting tank fixed to the connecting pipe and sealed with the connecting pipe, wherein the portion of the connecting pipe located in the liquid collecting tank is provided with a plurality of air pressure balance holes so that the reflux liquid generated by the siphon is collected in the liquid collecting tank;

[0009] A plurality of reflux pipes disposed at the bottom of the liquid collecting tank to return the reflux liquid collected in the liquid collecting tank to the liquid storage tank; and,

[0010] A balance concentration tube is connected to the bottom of the connecting tube, the end of the balance concentration tube is closed, and a plurality of diversion holes are arranged on the balance concentration tube.

[0011] To implement the above technical solution, when in use, the device is placed in a liquid storage tank, and the upper end of the connecting tube is fixedly connected to the liquid inlet of the liquid storage tank. During the normal charging and discharging process of the all-vanadium liquid flow battery, when the electrolyte enters from the liquid inlet of the liquid storage tank, it first enters the connecting tube, then enters the equilibrium concentration tube, and then enters the liquid storage tank after being diverted by the diversion hole. Since the flow rate, pressure and direction of the electrolyte flowing out from different diversion holes are different, the electrolyte will be dispersed more evenly after entering the liquid storage tank, and the concentration of the electrolyte in the liquid storage tank will change, which not only reduces the concentration difference of the electrolyte in the liquid storage tank, but also speeds up the circulation renewal rate of the electrolyte in the liquid storage tank during the entire reaction process. When the all-vanadium liquid flow battery stops working, the flow rate of the internal electrolyte suddenly changes, which will produce A pressure difference is generated, which in turn causes the electrolyte to siphon and impact the inside of the battery stack. Since an air pressure balance hole is provided on the connecting pipe, the pressure difference can be quickly balanced through the air pressure balance hole, thereby effectively reducing the siphon phenomenon. During the normal flow of the electrolyte, part of the electrolyte will also flow out of the air pressure balance hole and be collected in the liquid collecting tank, which is convenient for recycling. The electrolyte in the liquid collecting tank will flow along the reflux pipe to the liquid storage tank, so as to realize the reuse of the electrolyte. The utility model can simultaneously realize the functions of anti-siphon and concentration difference balance without the use of expensive drain valves and water distributors, which significantly reduces the production cost. During installation, only the connecting pipe needs to be connected to the liquid inlet of the liquid storage tank. The installation process is quicker and more convenient, and can effectively improve the overall space utilization.

[0012] In some exemplary embodiments, a three-way joint is provided at the bottom end of the connecting tube, and the balanced concentration tube is connected to both sides of the three-way joint.

[0013] To implement the above technical solution, the balanced concentration tube is conveniently connected via the three-way joint, and the balanced concentration tube is located on both sides of the three-way joint, which can make the electrolyte distribution more uniform.

[0014] In some exemplary embodiments, a connecting flange is provided at the top end of the connecting pipe, and the connecting flange is used to be connected and fixed to the liquid storage tank.

[0015] The above technical solution is implemented, and the connection flange is used to facilitate the connection and fixation with the liquid storage tank, and the flange connection method also has high sealing performance.

[0016] In some exemplary embodiments, the return pipe is disposed close to the connecting pipe.

[0017] In some exemplary embodiments, the liquid collecting tank is fixed to the connecting pipe by gluing, and the return pipe is fixed to the liquid collecting tank by gluing.

[0018] By implementing the above technical solution, the adhesive fixing method is simpler and more convenient to operate.

[0019] According to the second aspect of an embodiment of the present disclosure, a liquid storage tank is provided, wherein a liquid inlet is provided at the top of the liquid storage tank, and an anti-siphon concentration difference balancing device as described in the first aspect is provided inside the liquid storage tank, and the top end of the connecting pipe is connected to the liquid inlet, and the negative electrode electrolyte or the positive electrode electrolyte flows into the liquid storage tank from the liquid inlet through the anti-siphon concentration difference balancing device.

[0020] To implement the above technical solution, by arranging the anti-siphon concentration difference balancing device in the liquid storage pipe, the functions of anti-siphon and balancing concentration difference can be achieved simultaneously without using expensive drain valves and water distributors, which significantly reduces the production cost. During installation, only the connecting pipe needs to be connected to the liquid inlet of the liquid storage tank. The installation process is quicker and more convenient, and can effectively improve the overall space utilization.

[0021] In some exemplary embodiments, a liquid outlet is further provided on the bottom side of the liquid storage tank.

[0022] According to a third aspect of an embodiment of the present disclosure, there is provided an all-vanadium liquid flow battery system, comprising:

[0023] A battery stack, wherein two sides of the battery stack are respectively a positive electrode connection side and a negative electrode connection side;

[0024] At least two liquid storage tanks as described in the second aspect, the positive electrode connection side and the negative electrode connection side are respectively connected to at least one of the liquid storage tanks; and,

[0025] A conveyor unit for circulating the electrolyte.

[0026] To implement the above technical solution, when in use, the two liquid storage tanks respectively store the positive electrode electrolyte and the negative electrode electrolyte, and are respectively connected to the positive electrode connection side and the negative electrode connection side. The electrolyte is circulated and injected into the battery stack through the delivery unit, so that an electrochemical reaction occurs to generate electrical energy for power supply. The anti-siphoning concentration difference balancing device provided therein can reduce the siphoning phenomenon, thereby reducing the damage to the battery stack caused by the back impact of the electrolyte, and can also make the concentration of the electrolyte more balanced, thereby increasing the circulation renewal rate of the electrolyte during the reaction.

[0027] In some exemplary embodiments, at least one of the liquid storage tanks is connected to the positive electrode connection side through a first infusion tube and a first return tube, and at least another of the liquid storage tanks is connected to the negative electrode connection side through a second infusion tube and a second return tube.

[0028] In some exemplary embodiments, the conveying unit includes: a first conveying unit connected to the positive electrode connection side and a second conveying unit connected to the negative electrode connection side, the first conveying unit is connected to the first infusion tube and / or the first return tube, and the second conveying unit is connected to the second infusion tube and / or the second return tube.

[0029] In summary, compared with the prior art, the utility model has the following beneficial effects:

[0030] The utility model embodiment provides an anti-siphon concentration difference balancing device, a liquid storage tank and an all-vanadium liquid flow battery system, wherein the anti-siphon concentration difference balancing device is placed in the liquid storage tank, and the upper end of the connecting pipe is connected and fixed to the liquid inlet of the liquid storage tank. During the normal charging and discharging process of the all-vanadium liquid flow battery, when the electrolyte enters the liquid inlet of the liquid storage tank, it first enters the connecting pipe, then enters the balancing concentration tube, and then enters the liquid storage tank after being diverted by the diversion hole. When the electrolyte flows out from different diversion holes, the flow rate, pressure and direction of the outflowing electrolyte are all different. Therefore, when the electrolyte enters the liquid storage tank, it will be dispersed more evenly, and the concentration of the electrolyte in the liquid storage tank will change, which not only reduces the concentration difference of the electrolyte in the liquid storage tank, but also speeds up the circulation renewal rate of the electrolyte in the liquid storage tank during the whole reaction process. When the all-vanadium liquid flow battery stops working, due to the internal The flow rate of the electrolyte changes suddenly, which will generate a pressure difference, causing the electrolyte to siphon and impact the inside of the battery stack. Since an air pressure balance hole is provided on the connecting pipe, the pressure difference can be quickly balanced through the air pressure balance hole, thereby effectively reducing the siphon phenomenon. During the normal flow of the electrolyte, some electrolyte will flow out of the air pressure balance hole and be collected in the liquid collecting tank for easy recycling. The electrolyte in the liquid collecting tank will flow along the reflux pipe to the liquid storage tank to realize the reuse of the electrolyte. The utility model can simultaneously realize the functions of anti-siphon and concentration difference balance without the use of expensive drain valves and water distributors, which significantly reduces the production cost. During installation, only the connecting pipe needs to be connected to the liquid inlet of the liquid storage tank. The installation process is quicker and more convenient, and can effectively improve the overall space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the anti-siphon concentration difference balancing device in the utility model.

[0032] Figure 2 It is a cross-sectional view of the anti-siphon concentration difference balancing device in the utility model.

[0033] Figure 3 It is a structural schematic diagram of the liquid storage tank in the utility model.

[0034] Figure 4 It is a schematic diagram of the structure of the all-vanadium liquid flow battery system in the utility model.

[0035] The numbers and letters in the figure represent the corresponding component names:

[0036] 10. Anti-siphon concentration difference balancing device; 11. Connecting pipe; 111. Air pressure balancing hole; 112. Three-way joint; 113. Connecting flange; 12. Liquid collecting tank; 13. Reflux pipe; 14. Balance concentration pipe; 141. Diverter hole; 20. Liquid storage tank; 21. Liquid inlet; 22. Liquid outlet; 23. First liquid infusion pipe; 24. First liquid return pipe; 25. Second liquid infusion pipe; 26. Second liquid return pipe; 30. Battery stack; 31. Positive electrode connection side; 32. Negative electrode connection side; 41. First conveying unit; 42. Second conveying unit. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] like Figures 1 to 3 As shown, the first aspect of the embodiment of the utility model provides an anti-siphon concentration difference balancing device 10, including: a connecting pipe 11 used to be connected and fixed to the liquid inlet 21 of the liquid storage tank 20; a liquid collecting tank 12 fixed to the connecting pipe 11 and sealed with the connecting pipe 11, the part of the connecting pipe 11 located in the liquid collecting tank 12 is provided with a plurality of air pressure balancing holes 111 so that the reflux liquid generated by siphoning can be collected in the liquid collecting tank 12; a plurality of reflux pipes 13 arranged at the bottom of the liquid collecting tank 12 to return the reflux liquid collected in the liquid collecting tank 12 to the liquid storage tank 20; and a balancing concentration tube 14 passed through the bottom of the connecting pipe 11, the end of the balancing concentration tube 14 is closed, and a plurality of diversion holes 141 are provided on the balancing concentration tube 14.

[0039] Specifically, a three-way joint 112 is provided at the bottom end of the connecting tube 11, and the balanced concentration tube 14 is connected to both sides of the three-way joint 112. The three-way joint 112 is T-shaped as a whole, and two parallel interfaces are respectively used to connect the balanced concentration tube 14. The balanced connecting tube 11 is plugged and fixed to the three-way joint 112, and the balanced concentration tube 14 can be connected and fixed to the three-way joint by bonding. The balanced concentration tube 14 is conveniently connected through the three-way joint 112, and the balanced concentration tube 14 is located on both sides of the three-way joint 112, which can make the electrolyte distribution more uniform.

[0040] A connecting flange 113 is provided at the top end of the connecting pipe 11, and the connecting flange 113 is used to connect and fix with the liquid storage tank 20. The connecting flange 113 facilitates the connection and fixation with the liquid storage tank 20, and the flange connection method also has high sealing performance.

[0041] In this embodiment, the return pipe 13 is arranged close to the connecting pipe 11, the liquid collecting tank 12 is glued and fixed to the connecting pipe 11, and the return pipe 13 is glued and fixed to the liquid collecting tank 12. The glue fixation method is simpler and more convenient to operate.

[0042] When in use, the device is placed in the liquid storage tank 20, and the upper end of the connecting tube 11 is connected and fixed to the liquid inlet 21 of the liquid storage tank 20. During the normal charging and discharging process of the all-vanadium liquid flow battery, when the electrolyte enters from the liquid inlet 21 of the liquid storage tank 20, it first enters the connecting tube 11, then enters the equilibrium concentration tube 14, and then enters the liquid storage tank 20 after being diverted by the diverter hole 141. Since the flow rate, pressure and direction of the electrolyte flowing out from different diverter holes 141 are different, the electrolyte will be dispersed more evenly after entering the liquid storage tank 20, and the concentration of the electrolyte in the liquid storage tank 20 will change, which not only reduces the concentration difference of the electrolyte in the liquid storage tank 20, but also speeds up the circulation renewal rate of the electrolyte in the liquid storage tank 20 during the entire reaction process; when the all-vanadium liquid flow battery stops working, due to the sudden change in the flow rate of the internal electrolyte, a flow rate change will occur at this time. A pressure difference causes the electrolyte to siphon and impact the inside of the battery stack. Since the air pressure balance hole 111 is provided on the connecting tube 11, the pressure difference can be quickly balanced through the air pressure balance hole 111, thereby effectively reducing the siphon phenomenon. During the normal flow of the electrolyte, part of the electrolyte will flow out from the air pressure balance hole 111 and be collected in the liquid collecting tank 12 for easy recycling. The electrolyte in the liquid collecting tank 12 will flow along the reflux pipe 13 to the liquid storage tank 20 to realize the reuse of the electrolyte. The utility model can simultaneously realize the functions of anti-siphon and concentration difference balance without the use of expensive drain valves and water distributors, which significantly reduces the production cost. During installation, only the connecting tube 11 needs to be connected to the liquid inlet 21 of the liquid storage tank 20. The installation process is quicker and more convenient, and can effectively improve the overall space utilization.

[0043] The second aspect of the embodiment of the utility model provides a liquid storage tank 20, the top of the liquid storage tank 20 is provided with a liquid inlet 21, the liquid storage tank 20 is provided with an anti-siphon concentration difference balancing device 10 as in the first aspect, the top of the connecting pipe 11 is connected to the liquid inlet 21, the negative electrode electrolyte or the positive electrode electrolyte flows into the liquid storage tank 20 from the liquid inlet 21 through the anti-siphon concentration difference balancing device 10, and the bottom side of the liquid storage tank 20 is also provided with a liquid outlet 22 for the electrolyte to circulate out, and a flange is usually provided at the liquid inlet 21 for connecting and fixing with the connecting flange 113 at the top of the connecting pipe 11.

[0044] By arranging the anti-siphon concentration difference balancing device 10 in the liquid storage pipe, the functions of anti-siphon and balancing concentration difference can be achieved simultaneously without using expensive drain valves and water distributors, which significantly reduces the production cost. During installation, only the connecting pipe 11 needs to be connected to the liquid inlet 21 of the liquid storage tank 20. The installation process is quicker and more convenient, and can effectively improve the overall space utilization.

[0045] The third aspect of the embodiment of the utility model provides an all-vanadium liquid flow battery system, including: a battery stack 30, wherein the two sides of the battery stack 30 are respectively a positive electrode connection side 31 and a negative electrode connection side 32; at least two liquid storage tanks 20 as in the second aspect, wherein the positive electrode connection side 31 and the negative electrode connection side 32 are respectively connected to at least one liquid storage tank 20; and a conveying unit for realizing electrolyte circulation.

[0046] Specifically, at least one of the liquid storage tanks 20 is connected to the positive electrode connection side 31 through the first liquid infusion pipe 23 and the first liquid return pipe 24, and at least the other liquid storage tank 20 is connected to the negative electrode connection side 32 through the second liquid infusion pipe 25 and the second liquid return pipe 26. In this embodiment, a positive electrode liquid storage tank 20 for storing positive electrode electrolyte and a negative electrode liquid storage tank 20 for storing negative electrode electrolyte are provided; and the conveying unit includes: a first conveying unit 41 connected to the positive electrode connection side 31 and a second conveying unit 42 connected to the negative electrode connection side 32, the first conveying unit 41 is connected to the first liquid infusion pipe 23 and / or the first liquid return pipe 24, the second conveying unit 42 is connected to the second liquid infusion pipe 25 and / or the second liquid return pipe 26, in this embodiment, the first conveying unit 41 and the second conveying unit 42 both use infusion pumps, the first conveying unit 41 is connected to the first liquid infusion pipe 23, and the second conveying unit 42 is connected to the second liquid infusion pipe 25.

[0047] When in use, the two liquid storage tanks 20 respectively store positive electrode electrolyte and negative electrode electrolyte, and are respectively connected to the positive electrode connection side 31 and the negative electrode connection side 32. The electrolyte is circulated and injected into the battery stack 30 through the conveying unit, so that an electrochemical reaction occurs to generate electrical energy for power supply. The anti-siphoning concentration difference balancing device 10 arranged therein can reduce the siphoning phenomenon, thereby reducing the damage to the battery stack 30 caused by the back impact of the electrolyte, and can also make the concentration of the electrolyte more balanced, thereby improving the circulation renewal rate of the electrolyte during the reaction process.

[0048] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, several modifications and improvements can be made, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the utility model, and all of them belong to the protection scope of the utility model.

Claims

1. An anti-siphon concentration difference balancing device, characterized in that: include: A connecting pipe used for connecting and fixing with the liquid inlet of the liquid storage tank; A liquid collecting tank fixed to the connecting pipe and sealed with the connecting pipe, wherein the portion of the connecting pipe located in the liquid collecting tank is provided with a plurality of air pressure balance holes so that the reflux liquid generated by the siphon is collected in the liquid collecting tank; A plurality of reflux pipes arranged at the bottom of the liquid collecting tank to return the reflux liquid collected in the liquid collecting tank to the liquid storage tank; as well as, A balance concentration tube is connected to the bottom of the connecting tube, the end of the balance concentration tube is closed, and a plurality of diversion holes are arranged on the balance concentration tube.

2. The anti-siphon concentration difference balancing device according to claim 1, characterized in that: A three-way joint is provided at the bottom end of the connecting pipe, and the balanced concentration pipe is connected to both sides of the three-way joint.

3. The anti-siphon concentration difference balancing device according to claim 1 or 2, characterized in that: A connecting flange is provided at the top end of the connecting pipe, and the connecting flange is used to be connected and fixed to the liquid storage tank.

4. The anti-siphon concentration difference balancing device according to claim 1, characterized in that: The return pipe is arranged close to the connecting pipe.

5. The anti-siphon concentration difference balancing device according to claim 1 or 4, characterized in that: The liquid collecting tank is glued and fixed to the connecting pipe, and the return pipe is glued and fixed to the liquid collecting tank.

6. A liquid storage tank, characterized in that: A liquid inlet is provided on the top of the liquid storage tank, and an anti-siphon concentration difference balancing device as described in any one of claims 1 to 5 is provided in the liquid storage tank. The top end of the connecting pipe is connected to the liquid inlet, and the negative electrode electrolyte or the positive electrode electrolyte flows into the liquid storage tank from the liquid inlet through the anti-siphon concentration difference balancing device.

7. The liquid storage tank according to claim 6, characterized in that: The bottom side of the liquid storage tank is also provided with a liquid outlet.

8. An all-vanadium liquid flow battery system, characterized in that: include: A battery stack, wherein two sides of the battery stack are respectively a positive electrode connection side and a negative electrode connection side; At least two liquid storage tanks according to claim 7, the positive electrode connection side and the negative electrode connection side are respectively connected to at least one of the liquid storage tanks; and, A conveyor unit for circulating the electrolyte.

9. The all-vanadium liquid flow battery system according to claim 8, characterized in that: At least one of the liquid storage tanks is connected to the positive electrode connection side through a first liquid infusion pipe and a first liquid return pipe, and at least another of the liquid storage tanks is connected to the negative electrode connection side through a second liquid infusion pipe and a second liquid return pipe.

10. The all-vanadium liquid flow battery system according to claim 9, characterized in that: The conveying unit includes: a first conveying unit connected to the positive electrode connection side and a second conveying unit connected to the negative electrode connection side, the first conveying unit is connected to the first infusion pipe and / or the first return pipe, and the second conveying unit is connected to the second infusion pipe and / or the second return pipe.

Images