Injection mechanism for electrolyte of flow battery

Abstract

The utility model discloses a flow battery electrolyte injection mechanism which comprises a storage tank and an electric pile, the storage tank and the electric pile are communicated through a feeding pipeline and a discharging pipeline, and a driving pump machine is arranged on the feeding pipeline; the driving pump machine comprises a driving motor; the injection mechanism for the electrolyte of the flow battery relates to the technical field of flow batteries, is arranged between an electric pile and a storage tank, and aims to solve the problem that the electrolyte of an all-vanadium flow battery has acidic corrosivity, so that the electrolyte of the all-vanadium flow battery can be injected into the storage tank, and the service life of the storage tank is prolonged. The driving pump shell and the driving paddle which can be rapidly detached and replaced are arranged, meanwhile, the split type liquid flow monitoring devices are arranged on the water feeding side and the water discharging side of the driving pump shell, the liquid leakage problem can be detected in time, an alarm is given, meanwhile, the modular design mode is adopted, on one hand, the detaching, replacing and maintaining efficiency is improved, and on the other hand, the maintenance cost is reduced. On the other hand, the damage effect of electrolyte leakage on the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid flow batteries, in particular to an injection mechanism for electrolyte of a liquid flow battery. Background Art

[0002] Electrolyte is an important component of liquid flow batteries. In the structure of liquid flow batteries, the electrolyte is divided into positive electrode electrolyte and negative electrode electrolyte. In order to ensure the continuity of the reaction process, the electrolyte needs to circulate. At this stage, large-scale battery stacks are often used in conjunction with independent storage tanks.

[0003] At present, a pump is often used to circulate electrolyte between the flow battery stack and the storage tank. The pump draws electrolyte from the storage tank and injects it into one side of the battery stack. However, the pump-assisted method currently used is often coated with an anti-corrosion coating on the inner layer of the pump. This is because the electrolyte of the current all-vanadium flow battery is acidic and many electrons run in it. However, even if the coating is applied inside the pump casing, long-term use will still cause increased corrosion of the pump casing. Therefore, it is necessary to timely detect the electrolyte flow rate and increase the replacement rate of the pump casing. In view of this, in-depth research on the above issues has led to the creation of this case. Utility Model Content

[0004] In view of the deficiencies of the prior art, the present invention provides an injection mechanism for electrolyte of a flow battery, which solves the problems of the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A liquid flow battery electrolyte injection mechanism includes a storage tank and a battery stack, wherein the storage tank and the battery stack are connected through a feeding pipeline and a discharge pipeline, and a driving pump is provided on the feeding pipeline;

[0006] The driving pump includes a driving motor; one side of the driving end of the driving motor is connected to a driving pump housing, the driving pump housing is provided with a feeding joint and a discharging joint, a pair of connecting pipes are provided on both sides of the feeding joint and the discharging joint, a pair of control valves are provided on the pair of connecting pipes, and a pair of flow meters are provided on both sides of the pair of control valves;

[0007] A driving blade is provided in the driving pump housing, a flange is provided on one side of the driving pump housing, a flange is sleeved on one side of the driving end of the driving motor, a pair of flanges are connected in tension by a plurality of tension bolts, and the central axis of the driving blade is linked to the driving motor through a shaft key.

[0008] Preferably, a pair of connecting flanges are provided on both sides of a pair of connecting pipelines and are separately connected to the feeding pipeline.

[0009] Preferably, a fixing seat is provided at the bottom of the driving pump housing, a base is provided at the bottom of the driving motor, and the fixing seat is separately connected to the base.

[0010] Preferably, a shaft seat is provided at the inner end of the driving pump housing, the driving blade is assembled on the shaft seat, the center axis of the driving blade passes through the shaft seat, and a sealing rubber ring is provided on the shaft seat to seal the outside of the shaft seat.

[0011] Preferably, the inner cavity of the driving pump housing and the inner cavities of a pair of connecting pipes are both provided with an anti-corrosion coating.

[0012] Preferably, a shaft key sleeve is provided on the driving end of the driving motor and is sleeved on the central shaft key of the driving blade.

[0013] Beneficial effects

[0014] The utility model provides a flow battery electrolyte injection mechanism. It has the following beneficial effects: The flow battery electrolyte injection mechanism is arranged between the battery stack and the storage tank. To address the acidic and corrosive nature of the electrolyte in all-vanadium flow batteries, a quickly removable drive pump housing and drive blades are provided. Separate liquid flow monitoring devices are also provided on the upstream and downstream sides of the drive pump housing, enabling timely detection of leakage and issuing an alarm. A modular design is also employed, improving the efficiency of disassembly and maintenance while reducing the damage to the battery caused by electrolyte leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the electrolyte injection mechanism of a liquid flow battery described in the present invention.

[0016] Figure 2 This is a partial three-dimensional cross-sectional structural schematic diagram of a liquid flow battery electrolyte injection mechanism described in the present utility model.

[0017] Figure 3 This is a partial three-dimensional structural schematic diagram of a liquid flow battery electrolyte injection mechanism described in the present invention.

[0018] In the figure: 1. Storage tank; 2. Battery stack; 3. Feeding pipeline; 4. Discharging pipeline; 5. Drive motor; 6. Drive pump casing; 7. Feeding joint; 8. Discharging joint; 9. Connecting pipeline; 10. Control valve; 11. Flow meter; 12. Drive blade; 13. Flange; 14. Tension bolt; 15. Connecting flange; 16. Shaft seat. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 The present invention provides an implementation scheme: In the application process of modern all-vanadium liquid flow batteries, the electrolyte of the liquid flow battery needs to circulate between the battery stack 2 and the storage tank 1. The current pumping device needs to be well protected against corrosion because the electrolyte of the liquid flow battery is acidic. However, although the pump of the current all-vanadium liquid flow battery is usually protected against corrosion by an anti-corrosion coating on the inside, it is impossible to control the problem of leakage after the equipment is corroded, and it is inconvenient to operate during disassembly and replacement.

[0021] According to the instruction manual Figure 1-3 It can be seen that in response to the above problems, the present application discloses a liquid flow battery electrolyte injection mechanism, including a storage tank 1 and a battery stack 2. The storage tank 1 and the battery stack 2 are connected by a feeding pipe 3 and a feeding pipe 4. The feeding pipe 3 is provided with a driving pump. When in use, the number of storage tanks 1 should be two, respectively containing positive electrode electrolyte and negative electrode electrolyte. The electrolyte in the storage tank 1 is pumped into the battery stack 2 by the driving pump. The electrolyte in the battery stack 2 flows back from the battery stack 2 to the storage tank 1 under the action of liquid pressure;

[0022] In order to save the time of disassembly and replacement, the driving pump is modularized. Specifically, the driving pump includes a driving motor 5; a driving pump housing 6 is connected to the driving end of the driving motor 5. The driving pump housing 6 is used as a channel component that directly contacts the electrolyte to allow the electrolyte to circulate and provide a circulation channel for the electrolyte. A feeding joint 7 and a discharging joint 8 are provided on the driving pump housing 6. A pair of connecting pipes 9 are provided on both sides of the feeding joint 7 and the discharging joint 8. The pair of connecting pipes 9 are connected to the feeding pipe 3 as a driving pipe. The pump casing 6 is an extension of the feeding joint 7 and the discharging joint 8. A pair of control valves 10 are provided on a pair of connecting pipes 9. A pair of flow meters 11 are provided on both sides of the pair of control valves 10. The electrolyte passing through the drive pump casing 6 is measured by the pair of flow meters 11. When leakage occurs, the pair of control valves 10 are closed to avoid waste of electrolyte. At the same time, the drive pump casing 6 is repaired or replaced, thereby improving the efficiency of disassembly and replacement. The drive motor 5 and the drive pump casing 6 are connected in a split manner, which is also convenient for disassembly and replacement of the drive pump casing 6.

[0023] According to the instruction manual Figure 1-3It can be seen that a driving blade 12 is provided in the driving pump housing 6, a flange 13 is provided on one side of the driving pump housing 6, and a flange 13 is sleeved on one side of the driving end of the driving motor 5. The pair of flanges 13 are connected in tension by a plurality of tension bolts 14, and the central axis of the driving blade 12 is linked to the driving motor 5 through a shaft key;

[0024] In a specific implementation process, the driving blade 12 is connected to the driving end of the driving motor 5 by a shaft key, and the driving pump housing 6 can be quickly disassembled and replaced through the flange 13, and the sealing effect is maintained after installation.

[0025] As a preferred solution, further, a pair of connecting flanges 15 are provided on both sides of a pair of connecting pipes 9 and are separately connected to the feeding pipe 3. When the control valve 10 and the flow meter 11 need to be replaced, the replacement can be quickly achieved through the connecting flanges 15, which improves the modularity of the accessories, facilitates quick replacement, and reduces maintenance time.

[0026] As a preferred solution, further, a fixing seat is provided at the bottom of the driving pump housing 6 , and a base is provided at the bottom of the driving motor 5 . The fixing seat is separately connected to the base to support and fix the driving pump housing 6 .

[0027] As a preferred solution, further, a shaft seat 16 is provided at the inner end of the driving pump housing 6, and the driving blade 12 is assembled on the shaft seat 16. The central axis of the driving blade 12 passes through the shaft seat 16, and a sealing rubber ring is provided on the shaft seat 16 to seal the outside of the shaft seat 16. While the shaft seat 16 stabilizes the driving blade 12, the sealing rubber ring can prevent leakage of the electrolyte.

[0028] As a preferred solution, further, the inner cavity of the driving pump housing 6 and the inner cavities of the pair of connecting pipes 9 are both provided with an anti-corrosion coating.

[0029] As a preferred solution, further, a shaft key sleeve is provided on the driving end of the driving motor 5 and is sleeved on the central shaft key of the driving blade 12 .

[0030] From the above, it can be seen that the injection mechanism of the liquid flow battery electrolyte is arranged between the battery stack 2 and the storage tank 1. In view of the problem that the electrolyte of the all-vanadium liquid flow battery is acidic and corrosive, a drive pump housing 6 and a drive blade 12 that can be quickly replaced are provided. At the same time, a split liquid flow monitoring device is provided on the upstream and downstream sides of the drive pump housing 6, which can detect leakage problems in time and issue an alarm. At the same time, a modular design method is adopted to improve the efficiency of disassembly and maintenance on the one hand, and reduce the damage to the battery caused by electrolyte leakage on the other hand.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid flow battery electrolyte injection mechanism, comprising a storage tank (1) and a battery stack (2), wherein the storage tank (1) and the battery stack (2) are connected via a feeding pipeline (3) and a discharging pipeline (4), characterized in that: The feeding pipeline (3) is provided with a driving pump; The driving pump comprises a driving motor (5); a driving pump housing (6) is connected to one side of a driving end of the driving motor (5); a feeding joint (7) and a discharging joint (8) are provided on the driving pump housing (6); a pair of connecting pipes (9) are provided on both sides of the feeding joint (7) and the discharging joint (8); a pair of control valves (10) are provided on the pair of connecting pipes (9); and a pair of flow meters (11) are provided on both sides of the pair of control valves (10); A driving blade (12) is provided in the driving pump housing (6), a flange (13) is provided on one side of the driving pump housing (6), a flange (13) is sleeved on one side of the driving end of the driving motor (5), a pair of flanges (13) are connected in tension by a plurality of tension bolts (14), and the center axis of the driving blade (12) is linked to the driving motor (5) via a shaft key.

2. The electrolyte injection mechanism for a flow battery according to claim 1, characterized in that: A pair of connecting flanges (15) are provided on both sides of a pair of connecting pipelines (9) and are separately connected to the feeding pipeline (3).

3. The electrolyte injection mechanism of a flow battery according to claim 2, characterized in that: The bottom of the driving pump housing (6) is provided with a fixing seat, the bottom of the driving motor (5) is provided with a base, and the fixing seat is separately connected to the base.

4. The electrolyte injection mechanism for a flow battery according to claim 3, characterized in that: The inner end of the driving pump housing (6) is provided with a shaft seat (16), the driving blade (12) is assembled on the shaft seat (16), the center axis of the driving blade (12) passes through the shaft seat (16), and the shaft seat (16) is provided with a sealing rubber ring to seal the outside of the shaft seat (16).

5. The electrolyte injection mechanism for a flow battery according to claim 4, characterized in that: The inner cavity of the driving pump housing (6) and the inner cavities of a pair of connecting pipes (9) are both provided with an anti-corrosion coating.

6. The electrolyte injection mechanism for a flow battery according to claim 5, characterized in that: A shaft key sleeve is provided on the driving end of the driving motor (5) and is sleeved on the central shaft key of the driving blade (12).

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