Large-capacity liquid storage device of flow battery

Abstract

The invention relates to the technical field of liquid storage tanks of flow batteries, and provides a high-capacity liquid storage device of a flow battery, which comprises two rectangular liquid storage tanks and electric pile power systems, and the electric pile power systems are stacked at the upper ends of the same sides of the two liquid storage tanks. The liquid storage tank comprises a negative electrode tank body on one side and a positive electrode tank body on the other side, an avoiding seat is arranged at the upper end of the contact surface of the negative electrode tank body and the positive electrode tank body, a mounting plate is mounted on the avoiding seat, and a negative electrode circulating pipeline is arranged between the negative electrode tank body and the galvanic pile power system; it can be understood that the liquid flow storage tank capacity system is improved in the aspects of the storage tank shape, the filtering device, the connecting pipe, the liquid distribution mode and the like, and many problems existing in a traditional system are effectively solved. According to the improvements, the cost is reduced, the occupied area is reduced, the space utilization rate is increased, and the stability, reliability and operation efficiency of the system are enhanced.

Description

Technical Field

[0001] The present invention relates to the field of liquid flow battery liquid storage tanks, and more specifically, to a large-capacity liquid storage device for a liquid flow battery. Background Art

[0002] The flow battery reservoir is a key component in the flow battery system, used to store electrolyte solutions, usually chemical energy in liquid form. A flow battery is a rechargeable battery that stores and releases energy by flowing an electrolyte solution between two electrodes. The function of the reservoir is to store these electrolyte solutions and provide them to the battery reaction area for electrical energy conversion; the main functions of the flow battery reservoir are storage of electrolyte solutions, capacity and energy storage, regulation of electrolyte flow, efficient recycling, thermal management and stability;

[0003] In the existing medium and large liquid flow battery systems, the electric propulsion power system uses a container placed on the ground as a carrier, and the tank capacity system is commonly a round liquid storage tank placed on the ground, which requires an independent space, which is not conducive to the rational distribution of components between systems. In order to protect the liquid storage tank and use the space more rationally, it can be placed inside the container, and then an independent filter can be set in the liquid flow system;

[0004] For circular liquid storage tanks, when they need to be placed inside containers for protection, although they can be stacked with electric propulsion power systems in container form, due to their structural characteristics, circular liquid storage tanks cannot fully utilize the internal space of the container. In addition, traditional liquid storage tanks have fewer and smaller reserved external connection holes, which is not convenient for internal maintenance of the tank body and is not conducive to connection with other equipment. The scalability needs to be improved.

[0005] Independent filters occupy a large area and take up precious space resources in a container environment with limited space. At the same time, they are expensive. The complex structure and independent installation method make their manufacturing and maintenance costs high. In addition, the maintenance process is cumbersome and requires professional technicians and specific tools for large-scale disassembly and assembly, which brings inconvenience to the operation of the entire system.

[0006] Secondly, most of the pipes on the existing liquid storage devices are straight pipes, which require multiple adapters during installation and are often glued together. This installation method is not only troublesome, but also has the risk of leakage during long-term use due to factors such as glue aging and pipe stress changes. Leakage problems can lead to electrolyte loss, affect the normal operation of the system, and may even cause pollution to the surrounding environment. The bellows connection pipe effectively solves these problems.

[0007] In order to solve the above problems, this application proposes a large-capacity liquid storage device for a liquid flow battery. Summary of the invention

[0008] The object of the present invention is to provide a large-capacity liquid storage device for a liquid flow battery, which achieves the advantages of reasonable distribution of components and smaller occupied space by changing the shape of the liquid storage tank and integrally connecting the filter to the pipeline.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A large-capacity liquid storage device for a liquid flow battery comprises a liquid storage tank and a stack power system, wherein the liquid storage tank is rectangular and is provided in two arrangements, and the stack power system is stacked on the upper ends of the same side of the two liquid storage tanks, the liquid storage tank comprises a negative electrode tank body on one side and a positive electrode tank body on the other side, an escape seat is provided at the upper ends of the contact surfaces of the negative electrode tank body and the positive electrode tank body, a mounting plate is installed on the escape seat, a negative electrode circulation pipeline is provided between the negative electrode tank body and the stack power system, a positive electrode circulation pipeline is provided between the positive electrode tank body and the stack power system, the negative electrode circulation pipeline and the positive electrode circulation pipeline have the same structure and are diagonally distributed, and the negative electrode circulation pipeline and the positive electrode circulation pipeline both extend to be connected to the stack power system;

[0011] The negative electrode circulation pipeline includes a negative electrode liquid pipe group located at the upper end of the negative electrode tank and a negative electrode lower liquid pipe group located at the lower end of the negative electrode tank. The negative electrode circulation pipeline is also provided with a negative electrode filter melted into the pipeline. The various components in the negative electrode circulation pipeline are connected by a bellows.

[0012] The negative electrode circulation pipeline also includes a negative electrode circulation pump installed on the mounting plate and a negative electrode lower liquid connecting valve fixed on the negative electrode tank body and connecting the negative electrode lower liquid pipe group with the liquid inlet end of the negative electrode circulation pump. The negative electrode tank body is also fixed with a negative electrode upper liquid connecting valve located above the negative electrode lower liquid connecting valve and connected to the negative electrode liquid pipe group;

[0013] In the above technical solution, the pipeline connecting the negative electrode circulation pipeline and the negative electrode tank is arranged in the mounting plate, so that the overall structure distribution is more reasonable and compact.

[0014] The stack power system is respectively connected with a negative electrode liquid outlet pipe and a negative electrode liquid return pipe, wherein the other end of the negative electrode liquid outlet pipe is connected to the other end of the negative electrode upper liquid connecting valve, the other end of the negative electrode liquid return pipe is connected to one end of the negative electrode filter, and the other end of the negative electrode filter is connected to the liquid outlet end of the negative electrode circulation pump.

[0015] The positive electrode circulation pipeline includes a positive electrode liquid pipe group located at the upper end of the positive electrode tank body and a positive electrode lower liquid pipe group located at the lower end of the positive electrode tank body. The positive electrode circulation pipeline is also provided with a positive electrode filter melted into the pipeline. The components in the positive electrode circulation pipeline are connected by a bellows.

[0016] The positive electrode circulation pipeline also includes a positive electrode circulation pump installed on the mounting plate and a positive electrode lower liquid connecting valve fixed on the positive electrode tank body and connecting the positive electrode lower liquid pipe group with the liquid inlet end of the positive electrode circulation pump. The positive electrode tank body is also fixed with a positive electrode upper liquid connecting valve located above the positive electrode lower liquid connecting valve and connected to the positive electrode liquid pipe group;

[0017] The stack power system is respectively connected with a positive electrode liquid outlet pipe and a positive electrode liquid return pipe, wherein the other end of the positive electrode liquid outlet pipe is connected to the other end of the positive electrode upper liquid connection valve, the other end of the positive electrode liquid return pipe is connected to one end of the positive electrode filter, and the other end of the positive electrode filter is connected to the liquid outlet end of the positive electrode circulation pump;

[0018] In the above technical solution, by setting the upper and lower distributed pipelines and then reasonably opening through holes on the upper and lower pipes, the electrolyte inside the liquid storage tank can circulate more evenly. The uniform electrolyte distribution can improve the conversion efficiency and make the charging and discharging process more stable and efficient. At the same time, in terms of charging and discharging utilization, the upper and lower layer liquid distribution method also performs better, which can make full use of the chemical energy of the electrolyte, reduce energy loss, and improve the energy utilization efficiency of the entire system, thereby reducing operating costs and improving benefits in long-term operation.

[0019] The installation plate is provided with pipe holes for installing the negative electrode lower liquid connecting valve and the negative electrode upper liquid connecting valve in the negative electrode circulation pipeline.

[0020] In the above technical solution, the mounting plate is installed on the avoidance seat to facilitate the installation of the circulation pumps in the negative circulation pipeline and the positive circulation pipeline. At the same time, it can be set for positioning the pipelines on the negative circulation pipeline and the positive circulation pipeline to ensure the stability of the overall circulation pipeline.

[0021] The negative electrode tank body and the positive electrode tank body are both provided with manholes, the manholes are connected with sealing covers, the sealing covers are provided with liquid injection ports, and the sealing covers are also provided with a plurality of external reserved positions distributed in a circumference, and the reserved positions of the sealing covers are provided with hydrogen discharge ports, nitrogen flushing ports, balance pipe ports, and liquid return ports.

[0022] In the above technical solution, bolt connection holes are provided on the periphery of the cover and the manhole, which can be connected by bolts or direct welding according to user needs. As shown in the figure, there are six reserved holes, which can be opened according to actual needs to connect other required equipment.

[0023] The negative electrode circulation pipeline and the positive electrode circulation pipeline and their pipelines are distributed along the periphery of the manhole.

[0024] In the above technical solution, the good bending property of the bellows is utilized to distribute the pipelines more reasonably, thereby ensuring the use and maintenance of the manhole and the cover.

[0025] Beneficial effects of the present invention:

[0026] The present invention sets pipes distributed up and down inside the negative electrode tank and the positive electrode tank. Compared with a single lower layer liquid distribution pipe, the pipe arrangement can make the electrolyte distribution and circulation more uniform. The uniform electrolyte distribution can improve the conversion efficiency, making the charging and discharging process more stable and efficient. At the same time, in terms of charging and discharging utilization, the upper and lower layer liquid distribution method performs better, can make full use of the chemical energy of the electrolyte, reduce energy loss, and improve the energy utilization efficiency of the entire system, thereby reducing operating costs and improving benefits in long-term operation;

[0027] The present invention sets a filter on the pipeline body of the electrolyte circulation, which has many advantages compared with the traditional independent filter. From the perspective of cost, the pipeline filter is low-cost because its structure is relatively simple and does not require a complex shell and support structure. In terms of maintenance, it is simple and convenient to maintain. The staff can operate directly through the pipeline system without large-scale disassembly and reassembly like independent filters. Moreover, since it is built into the pipeline, it does not take up additional space, which greatly improves the space utilization rate inside the container;

[0028] The present invention arranges the liquid storage tank into a rectangular structure and arranges a reinforcement piece on the outside as a whole. After the two liquid storage tanks are combined, the stack power system can be stacked on top of them. Compared with the traditional separate placement method, the occupied space is effectively reduced, and the space utilization rate is higher than that of placing the liquid storage tanks inside the container and then stacking them, so that the entire liquid flow battery system is more compact.

[0029] The present invention replaces the traditional straight pipe connection with a bellows, and the bellows and the connector are installed with a slip-on flange. The bellows has good bending properties and can be more reasonably arranged inside a container with limited space. When the system is displaced due to temperature changes, vibrations and other factors, the bellows can adaptively adjust its shape to ensure the sealing of the connection.

[0030] The present invention arranges a manhole and a sealing cover on the electrolyte tank body, and a plurality of external pipe positions are reserved on the cover body, which can be directly hot-melted to open holes according to user needs. At the same time, bolt positions are reserved, which can be welded or bolted according to user needs. It can adapt to actual needs more flexibly and has stronger expandability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a structural schematic diagram of the main view of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of the structure from a side view;

[0034] Figure 3 for Figure 1 Schematic diagram of the structure of the intermediate liquid storage tank;

[0035] Figure 4 It is a schematic diagram of the structure of the negative electrode circulation pipeline;

[0036] Figure 5 It is a structural schematic diagram of the positive electrode circulation pipeline;

[0037] Figure 6 It is a structural schematic diagram of the mounting plate;

[0038] Figure 7 Schematic diagram of the structure of the negative electrode liquid tube group;

[0039] Figure 8 It is a structural schematic diagram of the cathode liquid tube group;

[0040] Fig. 9 It is a schematic diagram of the position and direction of the openings of the upper and lower liquid distribution pipes;

[0041] Fig.10 is a schematic diagram of the structure of the cover;

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] In the figure: 1. Liquid storage tank; 2. Stack power system;

[0044] 11. Negative electrode tank; 12. Positive electrode tank; 13. Avoidance seat; 14. Mounting plate; 15. Negative electrode circulation pipeline; 16. Positive electrode circulation pipeline; 17. Manhole; 18. Cover;

[0045] 141, tube hole;

[0046] 151. Negative electrode liquid pipe group; 152. Negative electrode lower liquid pipe group; 153. Negative electrode circulation pump; 154. Negative electrode lower liquid connecting valve; 155. Negative electrode upper liquid connecting valve; 156. Negative electrode liquid outlet pipe; 157. Negative electrode liquid return pipe; 158. Negative electrode filter;

[0047] 161. positive electrode liquid pipe group; 162. positive electrode lower liquid pipe group; 163. positive electrode circulation pump; 164. positive electrode lower liquid connecting valve; 165. positive electrode upper liquid connecting valve; 166. positive electrode liquid outlet pipe; 167. positive electrode liquid return pipe; 168. positive electrode filter;

[0048] 181, liquid injection port; 182, hydrogen discharge port; 183, nitrogen flushing port; 184, balance pipe port; 185, liquid return port;

[0049] 1511, liquid distribution pipe on negative electrode; 1512, connector on negative electrode;

[0050] 1521, negative electrode lower liquid distribution pipe; 1522, negative electrode reducer; 1523, negative electrode transverse pipe; 1524, negative electrode upper connecting pipe; 1525, negative electrode lower connector;

[0051] 1611, liquid distribution pipe on positive electrode; 1612, connector on positive electrode;

[0052] 1621. positive electrode lower liquid distribution pipe; 1622. positive electrode reducer; 1623. positive electrode cross pipe; 1624. positive electrode upper connecting pipe; 1625. positive electrode lower connector. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] like Figure 1 - Fig.10 As shown:

[0055] The present embodiment provides a large-capacity liquid storage device for a liquid flow battery, comprising a liquid storage tank 1 and a stack power system 2, wherein the liquid storage tank 1 is rectangular and is provided in two configurations, and the stack power system 2 is stacked on the upper end of the same side of the two liquid storage tanks 1, the liquid storage tank 1 comprises a negative electrode tank body 11 on one side and a positive electrode tank body 12 on the other side, an avoidance seat 13 is provided at the upper end of the contact surface between the negative electrode tank body 11 and the positive electrode tank body 12, a mounting plate 14 is installed on the avoidance seat 13, a negative electrode circulation pipeline 15 is provided between the negative electrode tank body 11 and the stack power system 2, and a positive electrode tank body 12 is provided between the positive electrode tank body 12 and the stack power system 2. A positive electrode circulation pipeline 16 is arranged between the power systems 2, and the negative electrode circulation pipeline 15 has the same structure as the positive electrode circulation pipeline 16 and is diagonally distributed. The negative electrode circulation pipeline 15 and the positive electrode circulation pipeline 16 are both extended to be connected with the stack power system 2; the negative electrode circulation pipeline 15 includes a negative electrode liquid pipe group 151 located at the upper end of the negative electrode tank body 11 and a negative electrode lower liquid pipe group 152 located at the lower end of the negative electrode tank body 11. The negative electrode circulation pipeline 15 is also provided with a negative electrode filter 158 integrated into the pipeline, and the various components in the negative electrode circulation pipeline 15 are connected by bellows.

[0056] As an embodiment of a large-capacity liquid storage device for a liquid flow battery of the present invention, the negative electrode circulation pipeline 15 also includes a negative electrode circulation pump 153 installed on the mounting plate 14 and a negative electrode lower liquid connecting valve 154 fixed on the negative electrode tank body 11 and connecting the negative electrode lower liquid pipe group 152 with the liquid inlet end of the negative electrode circulation pump 153. A negative electrode upper liquid connecting valve 155 located above the negative electrode lower liquid connecting valve 154 and connected to the negative electrode liquid pipe group 151 is also fixed on the negative electrode tank body 11;

[0057] Specifically, the negative electrode lower liquid connection valve 154 and the negative electrode upper liquid connection valve 155 can play a role of intercepting flow, so that the system can be quickly repaired when it is damaged.

[0058] As an embodiment of a large-capacity liquid storage device for a liquid flow battery of the present invention, a negative electrode liquid outlet pipe 156 and a negative electrode liquid return pipe 157 are respectively connected to the battery stack power system 2, wherein the other end of the negative electrode liquid outlet pipe 156 is connected to the other end of the negative electrode upper liquid connection valve 155, the other end of the negative electrode liquid return pipe 157 is connected to one end of a negative electrode filter 158, and the other end of the negative electrode filter 158 is connected to the liquid outlet end of a negative electrode circulation pump 153, and the negative electrode liquid pipe group 151 includes a negative electrode upper liquid distribution pipe 1511 arranged along the periphery of the inner upper end of the negative electrode tank body 11 and a negative electrode upper connector 151 fixed on the negative electrode upper liquid distribution pipe 1511 and connected to the negative electrode upper liquid connection valve 155. 2; The negative electrode liquid pipe group 151 also includes a negative electrode lower liquid distribution pipe 1521 arranged along the periphery of the inner bottom of the negative electrode tank body 11 and a negative electrode reducer 1522 located at the center of the negative electrode lower liquid distribution pipe 1521, a negative electrode cross pipe 1523 is connected between the negative electrode lower liquid distribution pipe 1521 and the negative electrode reducer 1522, a negative electrode upper pipe 1524 is connected to the upper end of the negative electrode reducer 1522, and a negative electrode lower pipe 1525 connected to the negative electrode lower liquid connection valve 154 is provided on the negative electrode upper pipe 1524; through holes are opened at the bottom and side of the negative electrode upper liquid distribution pipe 1511, and through holes are opened on the side of the negative electrode lower liquid distribution pipe 1521 and the negative electrode cross pipe 1523;

[0059] Specifically, the negative electrode liquid outlet pipe 156 and the negative electrode liquid return pipe 157 are connected to the inside of the battery stack power system 2. After the negative electrode circulation pump 153 is started, it drives the electrolyte inside the negative electrode tank 11 to enter from the negative electrode lower liquid pipe group 152 and flow through the negative electrode circulation pump 153 and the negative electrode filter 158, and then flows back to the battery stack power system 2 through the negative electrode return pipe 157. At the same time, the electrolyte inside the battery stack power system 2 flows to the inside of the negative electrode tank 11 through the negative electrode liquid outlet pipe 156 and the negative electrode liquid pipe group 151, and achieves a circulation effect through the negative electrode circulation pump 153, while the negative electrode filter 158 filters the electrolyte.

[0060] As an embodiment of a large-capacity liquid storage device for a liquid flow battery of the present invention, the positive electrode circulation pipeline 16 includes a positive electrode liquid pipe group 161 located at the upper end of the positive electrode tank body 12 and a positive electrode lower liquid pipe group 162 located at the lower end of the positive electrode tank body 12. The positive electrode circulation pipeline 16 is also provided with a positive electrode filter 168 melted into the pipeline. The components in the positive electrode circulation pipeline 16 are connected by a bellows; the positive electrode circulation pipeline 16 also includes a positive electrode circulation pump 163 installed on the mounting plate 14 and a positive electrode circulation pump 163 fixed on the positive electrode tank The positive electrode tank body 12 is provided with a positive electrode lower liquid connecting valve 164 which connects the positive electrode lower liquid pipe group 162 with the liquid inlet end of the positive electrode circulation pump 163. The positive electrode tank body 12 is also fixed with a positive electrode upper liquid connecting valve 165 which is located above the positive electrode lower liquid connecting valve 164 and connected to the positive electrode liquid pipe group 161. The stack power system 2 is respectively connected with a positive electrode liquid outlet pipe 166 and a positive electrode liquid return pipe 167, wherein the other end of the positive electrode liquid outlet pipe 166 is connected to the other end of the positive electrode upper liquid connecting valve 165, and the other end of the positive electrode liquid return pipe 167 is connected to the positive electrode upper liquid connecting valve 165. The positive electrode liquid pipe group 161 includes a positive electrode upper liquid distribution pipe 1611 arranged along the periphery of the inner upper end of the positive electrode tank body 12 and a positive electrode upper connector 1612 fixed on the positive electrode upper liquid distribution pipe 1611 and connected to the positive electrode upper liquid connection valve 165; the positive electrode liquid pipe group 161 also includes a positive electrode lower liquid distribution pipe 1621 arranged along the periphery of the inner bottom of the positive electrode tank body 12 and a positive electrode lower liquid distribution pipe 1622 located at the positive electrode lower liquid distribution pipe 1621. A positive electrode reducer 1622 is provided at the center of 1621, a positive electrode cross tube 1623 is connected between the positive electrode lower liquid distribution pipe 1621 and the positive electrode reducer 1622, a positive electrode upper connecting pipe 1624 is connected to the upper end of the positive electrode reducer 1622, and a positive electrode lower connecting pipe 1625 connected to the positive electrode lower liquid connection valve 164 is provided on the positive electrode upper connecting pipe 1624; through holes are provided at the bottom and side of the positive electrode upper liquid distribution pipe 1611, and through holes are provided at the side of the positive electrode lower liquid distribution pipe 1621 and the positive cross tube 1623;

[0061] Specifically, the positive electrode liquid outlet pipe 166 and the positive electrode liquid return pipe 167 are connected to the inside of the battery stack power system 2. After the positive electrode circulation pump 163 is started, it drives the electrolyte inside the positive electrode tank 12 to enter from the positive electrode lower liquid pipe group 162 and flow through the positive electrode circulation pump 163 and the positive electrode filter 168, and then flows back to the battery stack power system 2 through the positive electrode liquid return pipe 167. At the same time, the electrolyte inside the battery stack power system 2 flows to the inside of the positive electrode tank 12 through the positive electrode liquid outlet pipe 166 and the positive electrode liquid pipe group 161, and achieves a circulation effect through the positive electrode circulation pump 163, while the positive electrode filter 168 filters the electrolyte.

[0062] As an embodiment of a large-capacity liquid storage device for a liquid flow battery of the present invention, a pipe hole 141 for installing a negative electrode lower liquid connection valve 154 and a negative electrode upper liquid connection valve 155 in a negative electrode circulation pipeline 15 is provided on the mounting plate 14;

[0063] Specifically, the mounting plate 14 is bent into shape and fits in the avoidance seat 13 and is fixed by bolts. The pipe hole 141 is formed by punching and installed at the inner and outer interfaces of the liquid storage tank.

[0064] As an embodiment of a large-capacity liquid storage device for a liquid flow battery of the present invention, a manhole 17 is provided on both the negative electrode tank body 11 and the positive electrode tank body 12, and a cover 18 is connected to the manhole 17, and a liquid injection port 181 is provided on the cover 18, and a plurality of external reserved positions distributed in a circumference are also provided on the cover 18, and a hydrogen discharge port 182, a nitrogen flushing port 183, a balance pipe port 184, and a liquid return port 185 are provided on the reserved positions of the cover 18, and the negative electrode circulation pipeline 15 and the positive electrode circulation pipeline 16 and their pipelines are distributed along the periphery of the manhole 17;

[0065] Specifically, the cover 18 and the manhole 17 can be directly connected by bolts. Some users who do not use the manhole 17 can also directly hot-melt weld the two to form an integral body to form a completely closed cover. After the cover 18 is produced, multiple connection positions are reserved. The connection position is in a closed state when there is no hole. When it is necessary to connect external equipment according to actual needs, the connection position is opened and the joint is connected to facilitate the communication between the liquid storage tank and the outside, which has better adaptability.

[0066] It is understandable that the improvements in the liquid flow storage tank capacity system of the present invention in terms of storage tank shape, filtering device, connecting pipe and liquid distribution method effectively solve many problems existing in the traditional system. These improvements not only reduce costs, reduce floor space, and improve space utilization, but also enhance the stability, reliability and operating efficiency of the system.

[0067] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicate orientation or positional relationship, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0068] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-capacity liquid storage device for a liquid flow battery, comprising a liquid storage tank (1) and a battery stack power system (2), characterized in that: The liquid storage tank (1) is rectangular and is provided in two configurations, and the stack power system (2) is stacked on the upper ends of the same side of the two liquid storage tanks (1), the liquid storage tank (1) comprises a negative electrode tank body (11) on one side and a positive electrode tank body (12) on the other side, a relief seat (13) is provided at the upper ends of the contact surfaces of the negative electrode tank body (11) and the positive electrode tank body (12), a mounting plate (14) is installed on the relief seat (13), a negative electrode circulation pipeline (15) is provided between the negative electrode tank body (11) and the stack power system (2), a positive electrode circulation pipeline (16) is provided between the positive electrode tank body (12) and the stack power system (2), the negative electrode circulation pipeline (15) and the positive electrode circulation pipeline (16) have the same structure as the positive electrode circulation pipeline (16) and are diagonally distributed, and the negative electrode circulation pipeline (15) and the positive electrode circulation pipeline (16) are both extended to be connected to the stack power system (2); The negative electrode circulation pipeline (15) comprises a negative electrode liquid pipe group (151) located at the upper end of the negative electrode tank (11) and a negative electrode lower liquid pipe group (152) located at the lower end of the negative electrode tank (11). The negative electrode circulation pipeline (15) is also provided with a negative electrode filter (158) melted into the pipeline. The various components in the negative electrode circulation pipeline (15) are connected by bellows.

2. A large-capacity liquid storage device for a flow battery according to claim 1, characterized in that: The negative electrode circulation pipeline (15) further comprises a negative electrode circulation pump (153) mounted on the mounting plate (14) and a negative electrode lower liquid connection valve (154) fixed on the negative electrode tank (11) and connecting the negative electrode lower liquid pipe group (152) to the liquid inlet end of the negative electrode circulation pump (153); the negative electrode tank (11) is also fixedly provided with a negative electrode upper liquid connection valve (155) located above the negative electrode lower liquid connection valve (154) and connected to the negative electrode liquid pipe group (151).

3. A large-capacity liquid storage device for a flow battery according to claim 2, characterized in that: The stack power system (2) is respectively connected to a negative electrode liquid outlet pipe (156) and a negative electrode liquid return pipe (157), wherein the other end of the negative electrode liquid outlet pipe (156) is connected to the other end of the negative electrode upper liquid connection valve (155), the other end of the negative electrode liquid return pipe (157) is connected to one end of a negative electrode filter (158), and the other end of the negative electrode filter (158) is connected to the liquid outlet end of a negative electrode circulation pump (153).

4. A large-capacity liquid storage device for a flow battery according to claim 2, characterized in that: The negative electrode liquid pipe group (151) comprises a negative electrode upper liquid distribution pipe (1511) arranged along the periphery of the inner upper end of the negative electrode tank (11) and a negative electrode upper connector (1512) fixed on the negative electrode upper liquid distribution pipe (1511) and connected to the negative electrode upper liquid connection valve (155).

5. A large-capacity liquid storage device for a flow battery according to claim 4, characterized in that: The negative electrode liquid pipe group (151) further comprises a negative electrode lower liquid distribution pipe (1521) arranged along the periphery of the inner bottom of the negative electrode tank (11) and a negative electrode reducer (1522) located at the center of the negative electrode lower liquid distribution pipe (1521); a negative electrode transverse pipe (1523) is connected between the negative electrode lower liquid distribution pipe (1521) and the negative electrode reducer (1522); a negative electrode upper connecting pipe (1524) is connected to the upper end of the negative electrode reducer (1522); and a negative electrode lower connecting pipe (1525) connected to the negative electrode lower liquid connection valve (154) is provided on the negative electrode upper connecting pipe (1524).

6. A large-capacity liquid storage device for a liquid flow battery according to claim 5, characterized in that: The bottom and side of the negative electrode upper liquid distribution pipe (1511) are provided with through holes, and the side of the negative electrode lower liquid distribution pipe (1521) and the negative electrode transverse pipe (1523) are provided with through holes.

7. A large-capacity liquid storage device for a flow battery according to claim 2, characterized in that: The mounting plate (14) is provided with a pipe hole (141) for installing a negative electrode lower liquid connecting valve (154) and a negative electrode upper liquid connecting valve (155) in the negative electrode circulation pipeline (15).

8. A large-capacity liquid storage device for a liquid flow battery according to claim 1, characterized in that: The negative electrode tank body (11) and the positive electrode tank body (12) are both provided with a manhole (17), the manhole (17) is connected to a cover (18), the cover (18) is provided with a liquid injection port (181), and the cover (18) is also provided with a plurality of external reserved positions distributed in a circumference.

9. A large-capacity liquid storage device for a liquid flow battery according to claim 8, characterized in that: The reserved position of the sealing cover (18) is provided with a hydrogen discharge port (182), a nitrogen charging port (183), a balance pipe port (184) and a liquid return port (185).

10. A large-capacity liquid storage device for a liquid flow battery according to claim 9, characterized in that: The negative electrode circulation pipeline (15) and the positive electrode circulation pipeline (16) and their pipelines are distributed along the periphery of the manhole (17).

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