Shared storage tank composite device for solving SOC imbalance problem among redundant subsystems

Abstract

The utility model belongs to the technical field of flow batteries, and relates to a shared storage tank composite device for solving the problem of SOC imbalance among redundant subsystems, which comprises a plurality of galvanic piles which are connected in parallel and share a positive storage tank and a negative storage tank, a pipeline of the positive storage tank leading to the galvanic piles is provided with a liquid taking port A, and a pipeline of the negative storage tank leading to the galvanic piles is provided with a liquid taking port B; a liquid return port B is formed in the other pipeline, leading to the electric pile, of the positive storage tank, a liquid taking port C is formed in the pipeline, leading to the electric pile, of the negative storage tank, and a liquid return port D is formed in the other pipeline, leading to the electric pile, of the negative storage tank. The multiple sets of redundant subsystems are connected in parallel and independently share the storage tank, configuration, installation and use are easy, the cost effectiveness is good, the occupied area is small, the failure rate is low, and the reliability and stability of equipment are improved. An electrolyte taking opening and an electrolyte returning opening are consistent, it is guaranteed that the concentration, the flow speed and the operating temperature of electrolyte entering all subsystems are completely consistent, a liquid distribution pipe is arranged in the storage tank, it is guaranteed that ions of all valences in the storage tank are evenly distributed, and therefore SOC balance in the charging and discharging process is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of liquid flow battery, and relates to a common storage tank composite device for solving the SOC imbalance problem between redundant subsystems. BACKGROUND

[0002] Liquid flow batteries, particularly all-vanadium redox flow batteries, have shown great application potential in renewable energy storage, grid peak shaving, backup power supply and other fields in recent years as a highly efficient electrochemical energy storage technology. Its core advantages lie in its independent adjustable energy storage capacity and power, long cycle life, high safety and environmental friendliness. A liquid flow battery system is usually composed of a battery stack, electrolyte storage tanks, electrolyte circulating pumps, a control system and other key components. The electrolyte storage tank is used for storing positive and negative electrolytes and is an indispensable part of the liquid flow battery system.

[0003] In actual application, the reliability and stability of the liquid flow battery system are crucial. However, due to factors such as battery stack performance degradation, electrolyte leakage, control system failure, etc., the liquid flow battery system may face the risk of operation interruption. In order to improve the reliability and stability of the system, redundancy design is widely used in liquid flow battery systems. Redundancy design usually means adding additional key components or subsystems in the system, so that when the main system or component fails, the redundant component can quickly take over the work to ensure the continuous operation of the system.

[0004] In a liquid flow battery system, redundancy design is usually applied to key components such as battery stacks, electrolyte circulating pumps and control systems. For example, by configuring additional battery stacks and electrolyte circulating pumps, when the main battery stack or circulating pump fails, the system can automatically switch to the standby component to maintain normal operation of the system. However, this traditional redundancy design method has some problems. First, configuring redundant devices for each key component increases the complexity and cost of the system. Second, when the system is large in size, the floor area and energy consumption of the redundant devices will also increase significantly.

[0005] The existing vanadium flow battery module has multiple sets of parallel design, each having an independent complete system, and each subsystem usually includes two electrolyte storage tanks containing different valence state vanadium ions, two centrifugal pumps, a vanadium battery and an SOC component. Due to the independent complete system of each subsystem, the electrolyte ion concentration, flow uniformity and electrolyte temperature of each subsystem are different, leading to the problem of SOC imbalance, which restricts the development of all-vanadium redox flow batteries. Therefore, a vanadium flow battery module multiple set redundancy subsystem common storage tank design is proposed to solve the problem of SOC imbalance between subsystems. SUMMARY

[0006] The utility model discloses a kind of common storage tank composite devices for solving the SOC imbalance between redundant subsystems, especially solving the SOC imbalance of multiple sets of redundant subsystems arranged in parallel due to different electrolyte ion concentrations, uneven flow and inconsistent electrolyte temperature, and the technical scheme is as follows:

[0007] A common storage tank composite device for solving the SOC imbalance between redundant subsystems, a plurality of electric piles are connected in parallel, and a positive electrode storage tank and a negative electrode storage tank are shared.

[0008] Further, a liquid distribution pipe A is arranged at the liquid inlet A of the positive electrode storage tank, and a liquid distribution pipe C is arranged at the liquid inlet C of the negative electrode storage tank.

[0009] Further, a liquid distribution pipe B is arranged at the liquid return port B of the positive electrode storage tank, and a liquid distribution pipe D is arranged at the liquid return port D of the negative electrode storage tank.

[0010] Further, a centrifugal pump is arranged in the pipeline connecting the positive electrode storage tank and the electric pile of the subsystem.

[0011] Further, a centrifugal pump is arranged in the pipeline connecting the negative electrode storage tank and the electric pile of the subsystem.

[0012] The utility model has the beneficial effects compared with the prior art:

[0013] 1. Multiple sets of redundant subsystems share independent common storage tanks, which are easy to install and use, do not require additional configuration and design, have good cost-effectiveness, small footprint, low failure rate, and improve the reliability and stability of the equipment.

[0014] 2. Multiple sets of redundant subsystems share common storage tanks, and the electrolyte liquid inlet and liquid return port are consistent to ensure that the electrolyte concentration, flow rate, and operating temperature entering each subsystem are completely consistent, thereby ensuring SOC balance during charging and discharging.

[0015] 3. Liquid distribution pipes are arranged in the storage tanks to ensure uniform distribution of ions of various valences in the storage tanks, and to avoid excessive or insufficient electrolyte ion concentration in a certain part of the storage tank, which leads to different electrolyte concentrations entering each subsystem and affects SOC balance. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings and examples.

[0017] Figure 1 It is a structural diagram of the utility model device.

[0018] In the figure: 1. Electric pile A, 2. Electric pile B, 3. Positive electrode storage tank, 4. Negative electrode storage tank, 5. Liquid taking port A, 6. Liquid returning port B, 7. Liquid taking port C, 8. Liquid returning port C, 9. Liquid distribution pipe A, 10. Liquid distribution pipe B, 11. Liquid distribution pipe C, 12. Liquid distribution pipe D, 13. Centrifugal pump A, 14. Centrifugal pump B, 15. Centrifugal pump C, 16. Centrifugal pump D. DETAILED DESCRIPTION

[0019] The utility model is described in detail below through specific examples, but does not limit the protection scope of the utility model. Unless otherwise specified, the experimental method adopted by the utility model is a conventional method, and the experimental apparatus, materials, reagents and the like used can be obtained from commercial channels.

[0020] Example 1

[0021] The device of the utility model contains several subsystems, each of which includes an electric pile, two centrifugal pumps, a SOC and a matched pipeline equipment and the like, all of which share a positive electrode storage tank 3 and a negative electrode storage tank 4 and have the same liquid taking port and liquid returning port; liquid distribution pipes are arranged at each liquid taking port and liquid returning port to ensure that each ionic valence ion is uniformly distributed in the storage tank; the power provided by the centrifugal pump enables the vanadium electrolyte to continuously circulate in the storage tank and the electric pile during charging and discharging, causes oxidation-reduction reaction on the electrode surface and completes the charging and discharging process; because multiple sets of redundant subsystems share a positive and negative electrode storage tank and have the same liquid taking port and liquid returning port, and liquid distribution pipes are arranged at each liquid taking port and liquid returning port, the positive and negative electrode electrolyte concentration, flow speed and operating temperature of each subsystem are completely consistent, thus solving the problem of SOC imbalance during charging and discharging.

[0022] The following advantages of the utility model are specifically described:

[0023] I. Multiple sets of redundant subsystems are connected in parallel and share a storage tank independently;

[0024] 1. Multiple sets of redundant subsystems are connected in parallel and each has the same components and is independent (except for sharing a positive electrode storage tank 3 and a negative electrode storage tank 4), is simple to configure, install and use, does not require additional configuration and design, has good cost-effectiveness and small land occupation.

[0025] 2. Multiple sets of redundant subsystems are connected in parallel and share a storage tank independently, the control systems are independent and meet the respective start-stop requirements without affecting the operation of the remaining subsystems; the shared storage tank reduces the number of devices and the failure rate, improves the reliability and stability of the devices.

[0026] II. Multiple sets of redundant subsystems share a storage tank, and the electrolyte liquid taking port and liquid returning port are consistent;

[0027] The multiple sets of redundant subsystems share the tank and the electrolyte inlet and outlet are consistent, which can ensure that the electrolyte concentration, flow rate and operating temperature entering each subsystem are completely consistent, thereby ensuring the SOC balance during charging and discharging.

[0028] III. A liquid distribution pipe is arranged in the tank to ensure uniform distribution of each valence ion in the tank.

[0029] The liquid distribution pipe is arranged at the electrolyte outlet of the positive and negative tanks, which can ensure that each valence ion is uniformly distributed in the tank after the electrolyte returns to the tank after charging and discharging. The liquid distribution pipe is arranged at the electrolyte inlet, which can avoid the electrolyte concentration being too high or too low in the tank, thereby affecting the SOC balance.

[0030] Embodiment 2

[0031] This embodiment takes two sets of subsystems as an example for illustration.

[0032] As shown in Figure 1 , the stacks A1 and B2 in the composite device are connected in parallel, and share a positive tank 3 and a negative tank 4. One pipe connected between the positive tank 3 and the two stacks is provided with an electrolyte inlet A5, and the other pipe connected between the positive tank 3 and the two stacks is provided with an electrolyte outlet B6. One pipe connected between the negative tank 4 and the two stacks is provided with an electrolyte inlet C7, and the other pipe connected between the negative tank 4 and the two stacks is provided with an electrolyte outlet D8.

[0033] A liquid distribution pipe A9 is arranged at the electrolyte inlet A5 in the positive tank 3, and a liquid distribution pipe C11 is arranged at the electrolyte inlet C7 in the negative tank 4. A liquid distribution pipe B10 is arranged at the electrolyte outlet B6 in the positive tank 3, and a liquid distribution pipe D12 is arranged at the electrolyte outlet D8 in the negative tank 4.

[0034] The pipe connected between the positive tank 3 and the stack A1 is provided with a centrifugal pump A13, and the pipe connected between the positive tank 3 and the stack B2 is provided with a centrifugal pump B14. The pipe connected between the negative tank 4 and the stack B2 is provided with a centrifugal pump C15, and the pipe connected between the negative tank 4 and the stack A1 is provided with a centrifugal pump D16.

[0035] The above-described embodiments are only preferred embodiments of the present application, and not all the embodiments of the present application that can be implemented. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present application should be considered to be included in the protection scope of the claims of the present application.

Claims

1. A common storage tank complex for resolving the problem of SOC imbalance between redundant subsystems, characterized by, Several stacks are connected in parallel, sharing a positive tank (3) and a negative tank (4), the positive tank (3) having a pipe to the stacks provided with a liquid intake opening A (5), the positive tank (3) having another pipe to the stacks provided with a liquid return opening B (6), the negative tank (4) having a pipe to the stacks provided with a liquid intake opening C (7), the negative tank (4) having another pipe to the stacks provided with a liquid return opening D (8).

2. The common storage tank complex of claim 1, wherein, In the positive tank (3), a liquid distribution pipe A (9) is provided at the liquid intake opening A (5); in the negative tank (4), a liquid distribution pipe C (11) is provided at the liquid intake opening C (7).

3. The common storage tank complex of claim 1, wherein, In the positive tank (3), a liquid distribution pipe B (10) is provided at the liquid return opening B (6); in the negative tank (4), a liquid distribution pipe D (12) is provided at the liquid return opening D (8).

4. The common storage tank complex of claim 1, wherein, The pipe connecting the positive tank (3) to the stacks of the subsystem is provided with a centrifugal pump.

5. The common storage tank complex of claim 1, wherein, The pipe connecting the negative tank (4) to the stacks of the subsystem is provided with a centrifugal pump.

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