Large-capacity liquid storage device of flow battery

Abstract

The utility model 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 an electric pile power system, and the electric pile power system is 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] This utility model relates to the field of liquid storage tanks for flow batteries, and more specifically, to a large-capacity liquid storage device for flow batteries. Background Technology

[0002] The electrolyte reservoir is a key component of a flow battery system, used to store the electrolyte solution, typically in liquid form, containing chemical energy. A flow battery is a rechargeable battery that stores and releases energy by the flow of an electrolyte solution between two electrodes. The reservoir's function is to store this electrolyte solution and supply it to the battery's reaction zone for electrical energy conversion. The main functions of the flow battery reservoir are: electrolyte solution storage, capacity and energy storage, regulation of electrolyte flow, efficient recycling, thermal management, and stability.

[0003] In existing medium and large-sized flow battery systems, the electric propulsion power system uses a container placed on the ground as a carrier, while the storage capacity system is usually a circular liquid storage tank placed on the ground, which requires independent space and is not conducive to the rational distribution of components between systems. In order to protect the liquid storage tank and make more rational use of space, it is necessary to place it inside the container and then set an independent filter in the flow system.

[0004] For circular liquid storage tanks, when they need to be placed inside a container for protection, although they can be stacked with the container-type electric propulsion power system, due to their structural characteristics, circular liquid storage tanks cannot make full use of the container's internal space. In addition, traditional liquid storage tanks have few and small reserved external connection holes, which is not convenient for internal maintenance of the tank body and is not conducive to connection with other equipment. Their expandability needs to be improved.

[0005] Independent filters occupy a large area, which takes up valuable space in space-constrained environments such as shipping containers. At the same time, they are expensive, with complex structures and independent installation methods resulting in high manufacturing and maintenance costs. Moreover, the maintenance process is cumbersome, requiring professional technicians and specific tools for large-scale disassembly and assembly, which brings inconvenience to the operation of the entire system.

[0006] Secondly, most existing liquid storage devices use straight pipes, which require multiple adapters during installation and are often joined using glue. This installation method is not only cumbersome but also poses a risk of leakage over long-term use due to glue aging and pipe stress changes. Leakage can lead to electrolyte loss, affecting the normal operation of the system and potentially polluting the surrounding environment. Corrugated pipe connectors effectively solve these problems.

[0007] To address the aforementioned issues, this application proposes a high-capacity liquid storage device for flow batteries. Utility Model Content

[0008] The purpose of this invention is to provide a large-capacity liquid storage device for flow batteries. By changing the shape of the liquid storage tank and integrating the filter into the pipeline, the advantages of reasonable distribution of components and smaller space occupation are achieved.

[0009] The objective of this utility model can be achieved through the following technical solutions:

[0010] A high-capacity liquid storage device for a flow battery includes a liquid storage tank and a power stack system. The liquid storage tank is rectangular and there are two of them. The power stack system is stacked on the same upper side of the two liquid storage tanks. Each liquid storage tank includes a negative electrode tank on one side and a positive electrode tank on the other side. A clearance seat is provided at the upper end of the contact surface between the negative electrode tank and the positive electrode tank. An mounting plate is installed on the clearance seat. A negative electrode circulation pipeline is provided between the negative electrode tank and the power stack system. A positive electrode circulation pipeline is provided between the positive electrode tank and the power stack system. The negative electrode circulation pipeline and the positive electrode circulation pipeline have the same structure and are diagonally distributed. Both the negative electrode circulation pipeline and the positive electrode circulation pipeline extend to connect with the power stack system.

[0011] The negative electrode circulation pipeline includes a negative electrode liquid pipe assembly located at the upper end of the negative electrode tank and a negative electrode lower liquid pipe assembly located at the lower end of the negative electrode tank. The negative electrode circulation pipeline is also equipped with a negative electrode filter integrated into the pipeline. The components in the negative electrode circulation pipeline are connected by corrugated pipes.

[0012] The negative electrode circulation pipeline also includes a negative electrode circulation pump mounted on the mounting plate and a negative electrode lower liquid connection valve fixed on the negative electrode tank and connecting the negative electrode lower liquid pipe group to the liquid inlet of the negative electrode circulation pump. The negative electrode tank is also fixedly provided with a negative electrode upper liquid connection valve located above the negative electrode lower liquid connection 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 set in the mounting plate, making the overall structure more rational and compact.

[0014] The fuel cell power system is connected to a negative electrode outlet pipe and a negative electrode return pipe. The other end of the negative electrode outlet pipe is connected to the other end of the negative electrode liquid connection valve, the other end of the negative electrode 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 outlet of the negative electrode circulation pump.

[0015] The positive electrode circulation pipeline includes a positive electrode liquid pipe assembly located at the upper end of the positive electrode tank and a positive electrode lower liquid pipe assembly located at the lower end of the positive electrode tank. The positive electrode circulation pipeline is also equipped with a positive electrode filter integrated into the pipeline. The components in the positive electrode circulation pipeline are connected by corrugated pipes.

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

[0017] The power system of the fuel cell stack is connected to a positive electrode outlet pipe and a positive electrode return pipe. The other end of the positive electrode outlet pipe is connected to the other end of the positive electrode liquid connection valve, the other end of the positive electrode 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 outlet of the positive electrode circulation pump.

[0018] In the above technical solution, by setting up vertically distributed pipelines and then rationally opening through holes on the upper and lower pipelines, the electrolyte circulation inside the storage tank can be made more uniform. Uniform electrolyte distribution improves conversion efficiency, making the charging and discharging process more stable and efficient. At the same time, the vertically distributed electrolyte method also performs better in terms of charging and discharging utilization, fully utilizing the chemical energy of the electrolyte, reducing energy loss, and improving the overall energy utilization efficiency of the system. This reduces operating costs and increases efficiency in long-term operation.

[0019] The mounting plate has holes for installing the negative electrode lower liquid connection valve and the negative electrode upper liquid connection valve in the negative electrode circulation pipeline.

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

[0021] Both the negative electrode tank and the positive electrode tank are provided with manholes, and the manholes are connected to caps. The caps are provided with liquid injection ports, and the caps are also provided with multiple external reserved positions distributed in a circle. The reserved positions on the caps 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 around the cover and manhole. Bolts or direct welding can be used as needed by the user. As shown in the figure, there are six reserved holes, which can be opened to connect other required equipment as needed.

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

[0024] In the above technical solution, the good flexibility of the corrugated pipe can be used to distribute the pipeline more reasonably, thereby ensuring the use and maintenance of manholes and covers.

[0025] The beneficial effects of this utility model are:

[0026] This invention incorporates vertically distributed pipes inside both the negative and positive electrode tanks. Compared to a separate lower-layer electrolyte distribution pipe, this design allows for more uniform electrolyte distribution and circulation. This uniform electrolyte distribution improves conversion efficiency, resulting in a more stable and efficient charging and discharging process. Furthermore, the vertically distributed electrolyte distribution method offers superior charging and discharging utilization, fully utilizing the chemical energy of the electrolyte, reducing energy loss, and improving the overall system's energy efficiency. This, in turn, reduces operating costs and increases profitability over long-term operation.

[0027] This invention incorporates a filter within the electrolyte circulation pipeline, offering several advantages over traditional stand-alone filters. From a cost perspective, the pipeline filter is cheaper due to its relatively simple structure, eliminating the need for complex outer casings and support structures. Maintenance is also simple and convenient; workers can operate directly through the pipeline system without the extensive disassembly and reassembly required for stand-alone filters. Furthermore, because it is integrated into the pipeline, it does not occupy additional space, significantly improving the space utilization within the container.

[0028] This invention sets the liquid storage tank into a rectangular structure and sets a reinforcing member on the outside. The two liquid storage tanks can be combined and the power stack system can be stacked on top of them. Compared with the traditional separate placement method, the space occupied is effectively reduced. Compared with placing the liquid storage tanks inside the container and then stacking them, the space utilization rate is higher, thus making the entire flow battery system more compact.

[0029] This utility model replaces the traditional straight pipe connection with a corrugated pipe. The corrugated pipe and the connector are installed with a loose flange. The corrugated pipe has good flexibility and can be more rationally arranged in the space-constrained container. When the system is displaced due to factors such as temperature changes and vibration, the corrugated pipe can adaptively adjust its shape to ensure the connection is sealed.

[0030] This utility model features a manhole and a cover on the electrolyte tank. The cover has multiple pre-drilled external pipe positions, which can be directly heat-melted to open holes according to user needs. It also has pre-drilled bolt positions, which can be welded or bolted to fix according to user needs, making it more flexible to adapt to actual needs and more expandable. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the present invention from the front view.

[0033] Figure 2 for Figure 1 A side view of the structure;

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

[0035] Figure 4 This is a schematic diagram of the negative electrode circulation pipeline.

[0036] Figure 5 This is a schematic diagram of the positive electrode circulation pipeline.

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

[0038] Figure 7 This is a schematic diagram of the negative electrode liquid tube assembly;

[0039] Figure 8 This is a schematic diagram of the positive electrode liquid tube assembly;

[0040] Figure 9 This is a schematic diagram showing the location and direction of the openings in the upper and lower liquid distribution pipes;

[0041] Figure 10 This is a schematic diagram of the cap structure;

[0042] The attached diagram lists the components represented by each number as follows:

[0043] In the diagram: 1. Liquid storage tank; 2. Fuel cell power system;

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

[0045] 141. Pipe hole;

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

[0047] 161. Positive electrode liquid tubing assembly; 162. Positive electrode lower liquid tubing assembly; 163. Positive electrode circulation pump; 164. Positive electrode lower liquid connection valve; 165. Positive electrode upper liquid connection valve; 166. Positive electrode outlet pipe; 167. Positive electrode return pipe; 168. Positive electrode filter;

[0048] 181. Injection port; 182. Hydrogen vent port; 183. Nitrogen purging port; 184. Balance pipe port; 185. Return port;

[0049] 1511. Liquid distribution tube on the negative electrode; 1512. Connector on the negative electrode;

[0050] 1521. Lower negative electrode liquid distribution pipe; 1522. Negative electrode reducing connector; 1523. Negative electrode horizontal pipe; 1524. Upper negative electrode connecting pipe; 1525. Lower negative electrode connector;

[0051] 1611. Liquid distribution tube on the positive electrode; 1612. Connector on the positive electrode;

[0052] 1621. Positive electrode lower liquid distribution pipe; 1622. Positive electrode reducing connector; 1623. Positive electrode horizontal pipe; 1624. Positive electrode upper pipe; 1625. Positive electrode lower connector. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

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

[0055] This embodiment provides a large-capacity liquid storage device for a flow battery, including a liquid storage tank 1 and a battery stack power system 2. The liquid storage tank 1 is rectangular and two tanks are arranged together, with the battery stack power system 2 stacked on the same upper side of the two liquid storage tanks 1. Each liquid storage tank 1 includes a negative electrode tank 11 on one side and a positive electrode tank 12 on the other side. A clearance seat 13 is provided at the upper end of the contact surface between the negative electrode tank 11 and the positive electrode tank 12, and a mounting plate 14 is installed on the clearance seat 13. A negative electrode circulation pipeline 15 is provided between the negative electrode tank 11 and the battery stack power system 2, and the positive electrode tank 12 is connected to the battery stack... A positive electrode circulation pipeline 16 is provided between the power systems 2. The negative electrode circulation pipeline 15 has the same structure as the positive electrode circulation pipeline 16 and is diagonally distributed. Both the negative electrode circulation pipeline 15 and the positive electrode circulation pipeline 16 extend to connect with the fuel cell power system 2. The negative electrode circulation pipeline 15 includes a negative electrode liquid pipe assembly 151 located at the upper end of the negative electrode tank 11 and a negative electrode lower liquid pipe assembly 152 located at the lower end of the negative electrode tank 11. A negative electrode filter 158 is also provided on the negative electrode circulation pipeline 15. The components in the negative electrode circulation pipeline 15 are connected by corrugated pipes.

[0056] As an embodiment of the large-capacity liquid storage device for flow battery of this utility model, 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 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. 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 is also fixed on the negative electrode tank 11.

[0057] Specifically, the negative electrode lower liquid connection valve 154 and the negative electrode upper liquid connection valve 155 can act as a flow cut-off valve, thereby enabling rapid repair in case of system failure.

[0058] As an embodiment of the large-capacity liquid storage device for a flow battery according to this utility model, the power system 2 of the battery stack is respectively connected to a negative electrode outlet pipe 156 and a negative electrode return pipe 157. The other end of the negative electrode outlet pipe 156 is connected to the other end of the negative electrode liquid connection valve 155, and the other end of the negative electrode return pipe 157 is connected to one end of the negative electrode filter 158. The other end of the negative electrode filter 158 is connected to the outlet end of the negative electrode circulation pump 153. The negative electrode liquid pipe assembly 151 includes a negative electrode upper liquid distribution pipe 1511 arranged along the upper outer periphery of the inner side of the negative electrode tank 11 and a negative electrode upper connector 1511 fixed on the negative electrode upper liquid distribution pipe 1511 and connected to the negative electrode upper liquid connection valve 155. 12; The negative electrode liquid pipe assembly 151 also includes a negative electrode lower liquid distribution pipe 1521 arranged along the outer periphery of the bottom of the inner side of the negative electrode tank 11 and a negative electrode reducing connector 1522 located at the center of the negative electrode lower liquid distribution pipe 1521. A negative electrode horizontal pipe 1523 is connected between the negative electrode lower liquid distribution pipe 1521 and the negative electrode reducing connector 1522. A negative electrode upper pipe 1524 is connected to the upper end of the negative electrode reducing connector 1522, and a negative electrode lower connector 1525 connected to the negative electrode lower liquid connection valve 154 is provided on the negative electrode upper liquid distribution pipe 1511. Through holes are opened at the bottom and sides of the negative electrode upper liquid distribution pipe 1511, and through holes are opened on the sides of the negative electrode lower liquid distribution pipe 1521 and the negative electrode horizontal pipe 1523.

[0059] Specifically, the negative electrode outlet pipe 156 and the negative electrode return pipe 157 are connected to the inside of the fuel cell 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. Then, it flows back to the inside of the fuel cell power system 2 through the negative electrode return pipe 157. At the same time, the electrolyte inside the fuel cell power system 2 flows to the inside of the negative electrode tank 11 through the negative electrode outlet pipe 156 and the negative electrode liquid pipe group 151. The negative electrode circulation pump 153 achieves the circulation effect, while the negative electrode filter 158 filters the electrolyte.

[0060] As an embodiment of the large-capacity liquid storage device for a flow battery according to this utility model, the positive electrode circulation pipeline 16 includes a positive electrode liquid pipe assembly 161 located at the upper end of the positive electrode tank 12 and a positive electrode lower liquid pipe assembly 162 located at the lower end of the positive electrode tank 12. The positive electrode circulation pipeline 16 is also equipped with a positive electrode filter 168 fused to the pipe. The components in the positive electrode circulation pipeline 16 are connected by corrugated pipes. The positive electrode circulation pipeline 16 also includes a positive electrode circulation pump 163 mounted on a mounting plate 14 and a positive electrode pump fixed to the mounting plate 14. A positive electrode lower liquid connection valve 164 is fixed on the positive electrode tank body 12, connecting the positive electrode lower liquid pipe assembly 162 to the liquid inlet of the positive electrode circulation pump 163. A positive electrode upper liquid connection valve 165 is also fixed on the positive electrode tank body 12, located above the positive electrode lower liquid connection valve 164 and connected to the positive electrode liquid pipe assembly 161. A positive electrode outlet pipe 166 and a positive electrode return pipe 167 are respectively connected to the fuel cell power system 2. The other end of the positive electrode outlet pipe 166 is connected to the other end of the positive electrode upper liquid connection valve 165, and the other end of the positive electrode return pipe 167 is connected to the other end of the positive electrode return pipe 167. One end is connected to one end of the positive electrode filter 168, and the other end of the positive electrode filter 168 is connected to the outlet end of the positive electrode circulation pump 163; the positive electrode liquid pipe assembly 161 includes a positive electrode upper liquid distribution pipe 1611 arranged along the outer periphery of the upper inner side of the positive electrode tank 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 assembly 161 also includes a positive electrode lower liquid distribution pipe 1621 arranged along the outer periphery of the bottom inner side of the positive electrode tank 12 and located on the positive electrode lower liquid distribution pipe The positive electrode reducing connector 1622 is located at the center of 1621. A positive electrode horizontal pipe 1623 is connected between the positive electrode lower liquid distribution pipe 1621 and the positive electrode reducing connector 1622. A positive electrode upper pipe 1624 is connected to the upper end of the positive electrode reducing connector 1622, and a positive electrode lower connector 1625 is provided on the positive electrode lower liquid connection valve 164. Through holes are opened at the bottom and sides of the positive electrode upper liquid distribution pipe 1611, and through holes are opened on the sides of the positive electrode lower liquid distribution pipe 1621 and the positive electrode horizontal pipe 1623.

[0061] Specifically, the positive electrode outlet pipe 166 and the positive electrode return pipe 167 are connected to the inside of the fuel cell 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. Then, it flows back to the inside of the fuel cell power system 2 through the positive electrode return pipe 167. At the same time, the electrolyte inside the fuel cell power system 2 flows to the inside of the positive electrode tank 12 through the positive electrode outlet pipe 166 and the positive electrode liquid pipe group 161. The positive electrode circulation pump 163 achieves the circulation effect, while the positive electrode filter 168 filters the electrolyte.

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

[0063] Specifically, the mounting plate 14 is bent and fitted into the clearance seat 13 and fixed with bolts, and 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 the large-capacity liquid storage device for flow battery of this utility model, both the negative electrode tank 11 and the positive electrode tank 12 are provided with manholes 17, and a cover 18 is connected to the manhole 17. 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 circle. The reserved positions of the cover 18 are provided with a hydrogen discharge port 182, a nitrogen flushing port 183, a balance pipe port 184, and a liquid return port 185. The negative electrode circulation pipe 15 and the positive electrode circulation pipe 16 and their pipes are distributed around the manhole 17.

[0065] Specifically, the cap 18 and the manhole 17 can be directly connected by bolts. Some users who do not use the manhole 17 can also directly heat-melt weld them together to form a complete closure. After the cap 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 connector is connected to facilitate communication between the liquid storage tank and the outside, which has better adaptability.

[0066] Understandably, the improvements made to the liquid flow storage tank capacity system of this invention in terms of tank shape, filtration device, connecting pipes, and liquid distribution method effectively solve many problems existing in traditional systems. These improvements not only reduce costs, decrease floor space, and improve space utilization, but also enhance the stability, reliability, and operating efficiency of the system.

[0067] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

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

Claims

1. A high-capacity liquid storage device for a 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 there are two of them. The fuel cell power system (2) is stacked on the same upper side of the two liquid storage tanks (1). The liquid storage tank (1) includes a negative electrode tank (11) on one side and a positive electrode tank (12) on the other side. A clearance seat (13) is provided on the upper end of the contact surface of the negative electrode tank (11) and the positive electrode tank (12). An mounting plate (14) is installed on the clearance seat (13). A negative electrode circulation pipeline (15) is provided between the negative electrode tank (11) and the fuel cell power system (2). A positive electrode circulation pipeline (16) is provided between the positive electrode tank (12) and the fuel cell power system (2). The negative electrode circulation pipeline (15) and the positive electrode circulation pipeline (16) have the same structure and are diagonally distributed. Both the negative electrode circulation pipeline (15) and the positive electrode circulation pipeline (16) extend to connect with the fuel cell power system (2). The negative electrode circulation pipeline (15) includes a negative electrode liquid pipe assembly (151) located at the upper end of the negative electrode tank (11) and a negative electrode lower liquid pipe assembly (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) fused to the pipeline. The components in the negative electrode circulation pipeline (15) are connected by corrugated pipes.

2. The high-capacity liquid storage device for a flow battery according to claim 1, characterized in that: The negative electrode circulation pipeline (15) also includes 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 assembly (152) to the liquid inlet 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 assembly (151).

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

4. The high-capacity liquid storage device for a flow battery according to claim 2, characterized in that: The negative electrode liquid pipe assembly (151) includes a negative electrode upper liquid distribution pipe (1511) arranged along the outer periphery of the upper inner side 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 high-capacity liquid storage device for a flow battery according to claim 4, characterized in that: The negative electrode liquid pipe assembly (151) also includes a negative electrode lower liquid distribution pipe (1521) arranged along the outer periphery of the bottom of the inner side of the negative electrode tank (11) and a negative electrode reducing connector (1522) located at the center of the negative electrode lower liquid distribution pipe (1521). A negative electrode horizontal pipe (1523) is connected between the negative electrode lower liquid distribution pipe (1521) and the negative electrode reducing connector (1522). A negative electrode upper pipe (1524) is connected to the upper end of the negative electrode reducing connector (1522), and a negative electrode lower connector (1525) connected to the negative electrode lower liquid connection valve (154) is provided on the negative electrode upper pipe (1524).

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

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

8. The high-capacity liquid storage device for a flow battery according to claim 1, characterized in that: Both the negative electrode tank (11) and the positive electrode tank (12) are provided with manholes (17), and a cover (18) is connected to the manholes (17). The cover (18) is provided with a liquid injection port (181), and the cover (18) is also provided with multiple external reserved positions distributed in a circle.

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

10. A high-capacity liquid storage device for a 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 around the manhole (17).

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