Applicable to modular flow battery systems

Abstract

Applicable to a modular flow battery system, belonging to the field of all-vanadium flow battery evaluation, and used to solve the problem caused by the integration of the existing flow battery system for evaluation and the inability to be disassembled. The key points are as follows: the liquid outlet of the positive electrode storage tank is connected to the liquid inlet of the positive electrode circulation pump, and a connectable and detachable positive electrode liquid supply connector is installed on the pipeline between the liquid inlet of the positive electrode circulation pump and the positive electrode liquid inlet of the stack. A connectable and detachable positive electrode liquid return connector is installed on the pipeline between the positive electrode liquid outlet of the stack and the liquid inlet of the positive electrode storage tank. The effect is that the power module and the capacity module can be arbitrarily replaced to form a series of all-vanadium flow battery evaluations, which is applicable to systems for different battery evaluations.

Description

Technical Field

[0001] The present invention belongs to the field of all-vanadium redox flow battery evaluation, and relates to an all-vanadium redox flow battery system for evaluation. Background Art

[0002] With the continuous development of the all-vanadium redox flow energy storage industry, the importance of stack testing experiments has been increasing day by day, and the demand has been continuously increasing. However, the existing evaluation platforms have deficiencies in both experimental functions and operations, which to a certain extent affect the experimental progress and work efficiency. The lack of practical functions mainly lies in the difficulty of data collection and the need for manual on-site monitoring during operation. The prior art integrates the all-vanadium redox flow battery liquid storage tank, pipeline system, monitoring system, and bidirectional converter, and integrates the liquid storage tank, pipeline system, bidirectional converter, and industrial control computer into a movable box. This device is equipped with sensors such as flow rate, liquid level, and potentiometer, which can monitor various battery parameters in real time. The designed multi-stage adapter makes this test device suitable for the performance detection and evaluation of all-vanadium redox flow batteries of any size. The all-vanadium redox flow battery bidirectional converter can feed back the battery energy to the power grid, which can greatly reduce the energy consumption during the battery performance test. This device is plug-and-play, easy to operate, and has an on-site in-situ detection function, which can greatly reduce the battery test and energy storage power station maintenance costs. However, the all-vanadium redox flow stack evaluation system generally uses a heat exchanger for heat exchange, which increases energy consumption, occupies a large space, and is not conducive to the rapid connection between modules. In terms of operation, such as the integration of the cabinet, it cannot be disassembled, and it is difficult to operate when repairing some pipeline components, and it is relatively difficult to replace components such as storage tanks and pumps. All these greatly affect the work efficiency. Summary of the Invention

[0003] In order to solve the problems caused by the non-disassemblable integration of the existing liquid flow battery system for evaluation, the present invention provides a modular liquid flow battery system, which makes the capacity (i.e., the volume of the storage tank) and power (i.e., the size of the stack) form modules respectively, and can randomly measure stacks of different sizes or different electrolytes, which is flexible to use and easy to repair.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A modular applicable flow battery system includes a capacity module and a power module. The capacity module includes a positive electrode storage tank, a negative electrode storage tank, a positive electrode circulation pump, and a negative electrode circulation pump. The power module includes an electrolytic stack. The liquid outlet of the positive electrode storage tank is connected to the liquid inlet of the positive electrode circulation pump. A connectable and detachable positive electrode liquid supply connector is installed on the pipeline between the liquid outlet of the positive electrode circulation pump and the positive electrode liquid inlet of the electrolytic stack. A connectable and detachable positive electrode liquid return connector is installed on the pipeline between the positive electrode liquid outlet of the electrolytic stack and the liquid inlet of the positive electrode storage tank. The liquid outlet of the negative electrode storage tank is connected to the liquid inlet of the negative electrode circulation pump. A connectable and detachable negative electrode liquid supply connector is installed on the pipeline between the liquid outlet of the negative electrode circulation pump and the negative electrode liquid inlet of the electrolytic stack. A connectable and detachable negative electrode liquid return connector is installed on the pipeline between the negative electrode liquid outlet of the electrolytic stack and the liquid inlet of the negative electrode storage tank.

[0006] A modular applicable flow battery system includes a positive electrode storage tank, a positive electrode circulation pump connected to the liquid outlet of the positive electrode storage tank, a first positive electrode liquid supply pipeline connected to the liquid outlet of the positive electrode circulation pump, a first positive electrode liquid return pipeline connected to the liquid inlet of the positive electrode storage tank, a negative electrode storage tank, a negative electrode circulation pump connected to the liquid outlet of the negative electrode storage tank, a first negative electrode liquid supply pipeline connected to the liquid outlet of the negative electrode circulation pump, a first negative electrode liquid return pipeline connected to the liquid inlet of the negative electrode storage tank. The power module includes an electrolytic stack, a second positive electrode liquid supply pipeline connected to the positive electrode liquid inlet of the electrolytic stack, a second negative electrode liquid supply pipeline connected to the negative electrode liquid inlet of the electrolytic stack, a second positive electrode liquid return pipeline connected to the positive electrode liquid outlet of the electrolytic stack, a second negative electrode liquid return pipeline connected to the negative electrode liquid outlet of the electrolytic stack, a positive electrode liquid supply connector enabling connection and disconnection between the first positive electrode liquid supply pipeline and the second positive electrode liquid supply pipeline, a positive electrode liquid return connector enabling connection and disconnection between the first positive electrode liquid return pipeline and the second positive electrode liquid return pipeline, a negative electrode liquid supply connector enabling connection and disconnection between the first negative electrode liquid supply pipeline and the second negative electrode liquid supply pipeline, and a negative electrode liquid return connector enabling connection and disconnection between the first negative electrode liquid return pipeline and the second negative electrode liquid return pipeline.

[0007] As a supplement to the technical solution, each liquid supply connector and / or liquid return connector is a quick coupling.

[0008] As a supplement to the technical solution, one end of the quick coupling is made of the same material as the pipeline of the storage tank joint and is adhesively connected to it with pipe glue. The other end of the quick coupling is made of the same material as the pipeline of the electrolytic stack joint and is connected to it with pipe glue. One end of the quick coupling is threadedly connected to the other end of the quick coupling.

[0009] As a supplement to the technical solution, the capacity module and the power module are installed in different metal frames. The metal frames are connected by an electromagnetic connection device. The positive and negative electrode storage tanks of the capacity module are installed on the upper frame of the metal frame of the capacity module, and the positive and negative electrode circulation pumps are installed on the lower frame of the metal frame of the capacity module.

[0010] The stack of the power module is installed on the upper layer of the metal frame of the power module, most of the pipelines of the power module are installed on the lower layer of the metal frame of the power module, and rollers are installed on the chassis of the capacity module metal frame and the power module metal frame.

[0011] As a supplement to the technical solution, the electromagnetic connection device includes an electromagnetic block, a spring coil, and a wire connected to the spring coil. The spring coil is accommodated in the cavity of the electromagnetic block and is compressed and moved downward by energizing the wire, so that the electromagnetic block has the magnetism to adsorb the metal frame.

[0012] As a supplement to the technical solution, the positive electrode storage tank and / or the negative electrode storage tank is a jacketed heat exchange storage tank, which includes an outer barrel and an inner barrel for containing electrolyte. The inner barrel is installed in the outer barrel, and a jacket layer is formed between the inner barrel and the outer barrel. There are heat exchange medium inlets and outlets communicating with the jacket layer on the outer barrel wall. The jacket layer forms a closed space isolating the inner and outer barrels with the inner barrel wall, the outer barrel wall, the barrel bottom wall, and the cover plate. The jacket layer is partitioned into several relatively independent baffle partitions by baffle plates, and gap holes are opened on the baffle plates to enable the heat exchange medium to flow between different baffle partitions. The gap holes on at least two baffle plates are not at the same height.

[0013] One opposite side of each baffle plate is respectively fixed on the inner barrel wall and the outer barrel wall, and the other opposite side is respectively fixed on the barrel bottom wall and the cover plate. Two adjacent baffle plates are respectively the first baffle plate and the second baffle plate. The first baffle plate is at a distance from the cover plate and the baffle plate of this distance part is hollowed out to form the gap hole of the first baffle plate. The second baffle plate is at a distance from the barrel bottom plate and the baffle plate of this part is hollowed out to form the gap hole of the second baffle plate. The heat exchange medium inlets and outlets are located on the outer barrel wall of the two partitioned sides of a second baffle plate.

[0014] The gap hole of the first baffle plate occupies 5% - 10% of the height of the baffle plate from the cover plate along the first baffle plate towards the barrel bottom wall, and the second baffle plate occupies 5% - 10% of the height of the baffle plate from the barrel bottom wall along the second baffle plate towards the cover plate.

[0015] Beneficial effects:

[0016] (1) In the previous test system, one test system could only evaluate stacks with similar powers. The present invention adopts a modular design and is made by splicing between modules. The power module and the capacity module can be arbitrarily replaced to form a series of all-vanadium redox flow battery evaluations, which is applicable to systems for evaluating different batteries.

[0017] (2) Connectors that can be quickly connected and disassembled are used between modules, enabling a plug-and-play evaluation method for the storage tank and the stack, overcoming problems such as the difficulty of replacing the electrolyte in the traditional integrated design, and greatly improving the work efficiency.

[0018] (3) Adopt a hierarchical design concept to reduce the occupied space.

[0019] (4) Use a new type of jacketed storage tank to reduce heat exchange costs and the occupied space.

[0020] (5) The design inside the jacketed storage tank enables the cold water flow to go around the storage tank in an S-shaped route, increasing the heat exchange area, avoiding the dead zone in the cold water inside the jacket that may lead to reduced heat exchange effect, simplifying the heat exchange form, and reducing energy consumption.

[0021] (6) The traditional bypass heat exchange uses heat exchangers with many connecting pipelines, which is not conducive to disassembly and makes it difficult to form a modular evaluation system. When connected in series in the pipeline, it also makes the occupied space of the evaluation system too large. The design of the jacketed water-cooled storage tank well avoids these disadvantages.

[0022] (7) Place sensors in the pipeline to output a 4 - 20 mA signal in real time to achieve automatic data acquisition.

[0023] (8) The PH electrode monitoring device prevents the electrolyte in the storage tank from leaking into the cold water, increasing the safety of the system. Description of the Drawings

[0024] Figure 1 System diagram of the all-vanadium redox flow battery;

[0025] Figure 2 Three-dimensional assembly drawing;

[0026] Figure 3 Electromagnetic connection device between modules;

[0027] Figure 4 Top view of the jacketed heat exchange storage tank;

[0028] Figure 5 Cover plate of the jacket layer;

[0029] Figure 6 Front view of the jacketed water-cooled storage tank;

[0030] Figure 7 Schematic diagram of the special quick coupling structure connecting the storage tank joint;

[0031] Figure 8 Installation drawing of the electrolyte leakage monitoring device.

[0032] 1. Positive electrode storage tank, 2. Positive electrode liquid return connector, 3. First positive electrode liquid return pipeline, 4. Stack, 5. First negative electrode liquid return pipeline, 6. Negative electrode liquid return connector, 7. Negative electrode storage tank, 8. Negative electrode liquid supply connector, 9. Negative electrode circulation pump, 10. Second negative electrode liquid supply pipeline, 11. Second positive electrode liquid supply pipeline, 12. Positive electrode circulation pump, 13. Positive electrode liquid supply connector, 14. Outer frame, 15. Roller, 16. Connection between frames, 17. Negative electrode electrolyte sampling valve, 18. Positive electrode electrolyte sampling valve, 19. Electromagnetic block, 20. Spring coil, 21. Metal support rod with electromagnet, 22. Electric wire, 23. Cold water inlet, 24. Cold water outlet, 25. Outer barrel wall, 26. Inner barrel wall, 27. Electrolyte feeding port, 28. First upper baffle, 29. Electrolyte outlet, 30. Electrolyte inlet, 31. Baffle, 32. First lower baffle, 33. Second upper baffle, 34. One end of the slip knot, 35. The other end of the slip knot, 36. Water outlet pipeline, 37. PH electrode, 38. First positive electrode liquid supply pipeline, 39. First negative electrode liquid supply pipeline, 40. Second positive electrode liquid return pipeline, 41. Second negative electrode liquid return pipeline. Detailed implementation mode

[0033] Example: As Figure 1 shown, it is applicable to a modular flow battery system, which divides the system into two parts: a capacity module A and a power module B, and the control system controls the two parts of the capacity module A and the power module B, where:

[0034] The capacity module A includes a positive electrode storage tank 1, a positive electrode circulation pump 12 connected to the liquid outlet of the positive electrode storage tank, a first positive electrode liquid supply pipeline 38 connected to the liquid outlet of the positive electrode circulation pump, and a first positive electrode liquid return pipeline 3 connected to the liquid inlet of the positive electrode storage tank, a negative electrode storage tank 7, a negative electrode circulation pump 9 connected to the liquid outlet of the negative electrode storage tank, a first negative electrode liquid supply pipeline 39 connected to the liquid outlet of the negative electrode circulation pump, and a first negative electrode liquid return pipeline 5 connected to the liquid inlet of the negative electrode storage tank.

[0035] The power module includes a stack 4, a second positive electrode liquid supply pipeline 11 connected to the positive electrode liquid inlet of the stack, a second negative electrode liquid supply pipeline 10 connected to the negative electrode liquid inlet of the stack, a second positive electrode liquid return pipeline 40 connected to the positive electrode liquid outlet of the stack, a second negative electrode liquid return pipeline 41 connected to the negative electrode liquid outlet of the stack, a positive electrode liquid supply connector 13 that enables the first positive electrode liquid supply pipeline 38 and the second positive electrode liquid supply pipeline 11 to be connected and detached, a positive electrode liquid return connector 2 that enables the first positive electrode liquid return pipeline 3 and the second positive electrode liquid return pipeline 40 to be connected and detached, a negative electrode liquid supply connector 8 that enables the first negative electrode liquid supply pipeline 39 and the second negative electrode liquid supply pipeline 10 to be connected and detached, and a negative electrode liquid return connector 6 that enables the first negative electrode liquid return pipeline 5 and the second negative electrode liquid return pipeline 41 to be connected and detached.

[0036] For example: Consider the volume module as a master system module A, and its subsystem modules include a1: two storage tanks with a maximum electrolyte volume of two tanks with a diameter of 800 mm and a height of 1000 mm, and two circulation pumps with an output power of 1.5 kw; a2: two storage tanks with a maximum electrolyte volume of two tanks with a diameter of 400 mm and a height of 500 mm, and two circulation pumps with an output power of 0.75 kw; a3: two storage tanks filled with electrolytes with different ratios from a1 and a2, with a maximum electrolyte volume of two tanks with a diameter of 400 mm and a height of 500 mm, and two circulation pumps with an output power of 0.75 kw, and so on; The test power module is a master system module B, and its subsystems include b1: a stack with a main pipeline of DN20 and a power of 1 kw; b2: a stack with a main pipeline of DN40 and a power of 33 kw, and so on.

[0037] When wanting to measure the 1KW stack (i.e., b1), the a2 in the master system module A can be called (i.e., two storage tanks with a diameter of 400 mm and a height of 500 mm, and two circulation pumps with an output power of 0.75 kw). First, use a quick coupling to connect the circulation pump to the stack pipeline, and also use a quick coupling to connect the pipeline to the storage tank. After aligning the frame positions, operate the electric control part, power on, make the electromagnet block charged, and connect the frames together. During the test, use conventional test methods, start the power supply, and test parameters such as the voltage and efficiency of the stack.

[0038] When wanting to compare the influence of the electrolyte on the stack efficiency, a2 and a3 (i.e., different electrolytes) in the master system module A and the 1kw stack in the master system module B can be called. Connect them arbitrarily. First, use a quick coupling to connect the circulation pump to the stack pipeline, and also use a quick coupling to connect the pipeline to the storage tank. After aligning the frame positions, operate the electric control part, power on, make the electromagnet block charged, and connect the frames together. Install various sensors on the liquid supply pipeline and the liquid return pipeline to achieve automatic data collection. By comparing data such as the voltage and efficiency of the stack under different electrolytes, compare the influence of different electrolytes on the battery performance.

[0039] Figure 2 It is a perspective view of a flow battery system suitable for modularization in an embodiment. In this embodiment, a modular design concept is adopted. The positive storage tank 1, negative storage tank 7 of the volume module A, positive circulation pump 12, and negative circulation pump 9 are designed as a whole and placed in the upper and lower layers of a metal frame in upper and lower layers, saving floor space. The stack of the power block and the pipeline connected to the stack are designed as a whole, and also placed in layers. The stack is placed on the upper layer of most of the main pipelines of the same metal frame, and most of the main pipelines are located on the lower layer of the metal frame.

[0040] The connection between the capacity module and the power module includes two connection methods: pipeline connection and frame connection. For the pipeline connection, such as the connection of the positive liquid return connector 2 and the negative liquid return connector 6, a quick coupling connection method is used to connect the pipeline to the storage tank; for the pipeline connection, such as the connection of the positive liquid supply connector 13 and the negative liquid supply connector 8, a quick coupling connection method is used to connect the circulation pump to the stack pipeline. For the frame, it is made of metal materials, such as iron materials, and the connection 16 between the frames is connected by an electromagnetic method. Figure 3 It is a diagram of the electromagnetic connection method. Current is input through the wire 22, causing the spring coil to compress and move inside the electromagnetic block 19 in the cavity, so that the electromagnetic block becomes magnetic and can attract the metal frames to be connected, thus realizing the connection between the frames.

[0041] When it is necessary to replace different storage tanks or stack pipelines, one end of the detachable quick coupling can be removed, and at the same time, the power is cut off. The magnets between the frames of the capacity module and the power module lose their magnetism, and the two parts can be disassembled. In this embodiment, rollers 15 are installed at the bottom of the frame, and the module to be replaced can be directly pushed away, and at the same time, a new module of the same type but different size is pushed in. The stack pipeline is connected to the storage tank with a quick coupling, and then current is applied. The electromagnet is charged and can attract the frames of the two modules together.

[0042] In this embodiment, when evaluating the battery, the dimensions of each component are described: the positive and negative storage tanks are electrolyte storage tanks, and the height range of the storage tank can be designed to the required dimensions of the subsystem under any parent system according to actual needs. The stack power can be 1 kw to 33 kw. The liquid return port can be adjusted arbitrarily by the quick coupling variable diameter according to the volume of the capacity module required in actual needs, and the radius of the external storage tank outlet is 20 mm. The voltage of the electromagnetic connection device is 12 - 24 v, and the suction force is 5 - 10 N.

[0043] Figure 4 It is a top view of a modular jacketed heat exchange storage tank applicable to a modular flow battery system. The heat exchange medium of this storage tank can be selected such as water, that is, it is a jacketed heat exchangeable storage tank. In this embodiment, it is selected as a jacketed water-cooled storage tank, including an inner barrel wall 26, with electrolyte installed inside the inner barrel wall, a jacket between the outer barrel wall and the inner barrel wall 26 and the outer barrel wall 25, and the jacket is used to pass cold water to exchange heat for the electrolyte inside the inner barrel wall 26. Above the jacket layer, an annular cover plate (such as Figure 5(As shown), it is welded to the inner barrel wall 26 and outer barrel wall 25, respectively, sealing the jacket layer for water flow. When the flow battery system needs to exchange heat, cold water flows into the jacket through the cold water inlet 23 on the outer barrel wall. Because the baffle 31 is the same height as the jacket, it is fixed in the center of the jacket, with its upper end fixed to the jacket annular cover and its lower end fixed to the barrel bottom, dividing the jacket space into two. There are several baffles, divided into upper and lower baffles. The first upper baffle 28 has a clearance of 5% to 10% of the barrel's height between its lower end and the barrel bottom, and its upper end is tightly connected to the annular cover. Therefore, cold water flows clockwise along the jacket layer in the figure. The first lower baffle 32 is opposite the first upper baffle 28. Its upper end has a clearance of 5% to 10% of the barrel's height between its upper end and the annular cover, and its lower end is tightly connected to the barrel bottom. The second upper baffle 33 has a clearance of 5% to 10% of the barrel's height between its lower end and the barrel bottom, and its upper end is tightly connected to the annular cover. Therefore, cold water flows clockwise around the barrel in an S-shaped path, ultimately flowing out of the cold water outlet 24. The electrolyte enters the inner storage tank through the electrolyte inlet 30 and is pumped out through the electrolyte outlet 29. The electrolyte feed port 27 is used for adding electrolytes. This arrangement ensures more efficient heat exchange.

[0044] Figure 5 The figure shows the annular cover plate used on the upper side of the jacket layer, which is a detachable sealing connection.

[0045] Figure 6 Shown is a front view of a jacketed water-cooled heat exchange storage tank.

[0046] like Figure 7 As shown, the positive and negative electrode storage tanks are made of PP, so the connectors on the tank side are also made of PP, that is, the first positive and negative electrode return lines, the first positive and negative electrode supply lines, etc. of the storage tank are made of PP. When the slipknot is connected, the slipknot connector is connected to the connector of the shown pipeline. The pipelines connected to the battery stack (such as the second positive and negative electrode supply lines, the second positive and negative electrode return lines) and the slipknot are all made of PVC. Due to different thermal deformation coefficients, after the system has been running for a period of time, the PP connector on the storage tank and the PVC slipknot are connected by pipe glue. The different materials are prone to leakage. To solve this problem, the slipknot is made of two parts. One end 34 of the slipknot is made of PP material and adhered to the connector on the tank side with pipe glue. The other end 35 of the slipknot is made of PVC material and connected to the pipeline with pipe glue. The two ends of the slipknot are connected by internal threads and raw tape, avoiding leakage problems caused by the different materials of the storage tank and the pipeline.

[0047] Figure 8It is an electrolyte leakage monitoring device, installed on the outlet pipeline 36 of the circulating cold water pipe for cooling the storage tank. The PH electrode 37 can detect the PH value of the cold water. If the PH value shows that the cold water is acidic, it means that the electrolyte in the inner cylinder leaks into the cold water. Through electronic control, the interlocked cold water pipes, such as the electric ball valve on the water pipe, will be closed and the system operation will be stopped.

[0048] As mentioned above, it is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the technical field, within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent replacements or changes should be covered within the protection scope of the present invention.

Claims

1. A modular flow battery system, characterized in that, It includes a capacity module and a power module. The capacity module and the power module are installed on different metal frames, and the metal frames are connected by an electromagnetic connection device. The positive and negative storage tanks (7) of the capacity module are installed on the upper frame of the metal frame of the capacity module, and the positive and negative circulation pumps (9) are installed on the lower frame of the metal frame of the capacity module. Specifically, it includes a positive storage tank (1), a positive circulation pump (12) connected to the liquid outlet of the positive storage tank (1), a first positive liquid supply pipeline (38) connected to the liquid outlet of the positive circulation pump (12), a first positive liquid return pipeline (3) connected to the liquid inlet of the positive storage tank (1), a negative storage tank (7), a negative circulation pump (9) connected to the liquid outlet of the negative storage tank (7), a first negative liquid supply pipeline (39) connected to the liquid outlet of the negative circulation pump (9), a first negative liquid return pipeline (5) connected to the liquid inlet of the negative storage tank (7). The power module includes an electrolyzer stack (4), a second positive liquid supply pipeline (11) connected to the positive liquid inlet of the electrolyzer stack (4), a second negative liquid supply pipeline (10) connected to the negative liquid inlet of the electrolyzer stack (4), a second positive liquid return pipeline (40) connected to the positive liquid outlet of the electrolyzer stack (4), a second negative liquid return pipeline (41) connected to the negative liquid outlet of the electrolyzer stack (4), a positive liquid supply connector (13) that enables the first positive liquid supply pipeline (38) and the second positive liquid supply pipeline (11) to be connected and detached, a positive liquid return connector (2) that enables the first positive liquid return pipeline (3) and the second positive liquid return pipeline (40) to be connected and detached, a negative liquid supply connector (8) that enables the first negative liquid supply pipeline (39) and the second negative liquid supply pipeline (10) to be connected and detached, a negative liquid return connector (6) that enables the first negative liquid return pipeline (5) and the second negative liquid return pipeline (41) to be connected and detached; Each liquid supply connector and / or liquid return connector is a quick coupling; one end (34) of the quick coupling is made of the same material as the storage tank connection pipeline and is adhesively connected to it with pipe glue, the other end (35) of the quick coupling is made of the same material as the electrolyzer stack (4) connection pipeline and is connected to it with pipe glue, and one end (34) of the quick coupling is threadedly connected to the other end (35) of the quick coupling.

2. The modular flow battery system according to claim 1, wherein The electrolyzer stack (4) of the power module is installed on the upper layer of the metal frame of the power module, and most of the pipelines of the power module are installed on the lower layer of the metal frame of the power module. The bottom frames of the metal frame of the capacity module and the metal frame of the power module are equipped with rollers (15).

3. The modular flow battery system according to claim 1, characterized in that, The electromagnetic connection device includes an electromagnetic block (19), a spring coil (20), and a wire (22) connected to the spring coil (20). The spring coil (20) is placed in the cavity of the electromagnetic block (19) and is compressed and moved downward by energizing the wire (22), so that the electromagnetic block (19) has magnetism to adsorb the metal frame.

4. The modular flow battery system according to claim 1, wherein, The positive electrode storage tank (1) and / or the negative electrode storage tank (7) is a jacketed heat exchange storage tank, which includes an outer barrel and an inner barrel for containing electrolyte. The inner barrel is installed in the outer barrel, and a jacket layer is formed between the inner barrel and the outer barrel. There are heat exchange medium inlets and outlets communicating with the jacket layer on the outer barrel wall (25). The jacket layer forms a closed space isolating the inner and outer barrels with the inner barrel wall (26), the outer barrel wall (25), the bottom barrel wall, and the cover plate. The jacket layer is partitioned into several relatively independent flow-blocking partitions by at least two flow-blocking plates, and gap holes are opened on the flow-blocking plates to enable the heat exchange medium to flow between different flow-blocking partitions. The gap holes on the flow-blocking plates are not at the same height.

5. The modular flow battery system according to claim 4, characterized in that, One opposite side of each flow-blocking plate is respectively fixed on the inner barrel wall (26) and the outer barrel wall (25), and the other opposite side is respectively fixed on the bottom barrel wall and the cover plate. Two adjacent flow-blocking plates are respectively the first flow-blocking plate and the second flow-blocking plate. The first flow-blocking plate is at a distance from the cover plate and the flow-blocking plate of this separated part is hollowed out to form the gap hole of the first flow-blocking plate. The second flow-blocking plate is at a distance from the bottom barrel plate and the flow-blocking plate of this part is hollowed out to form the gap hole of the second flow-blocking plate. The heat exchange medium inlets and outlets are located on the outer barrel wall of the two partitions on both sides of a second flow-blocking plate.

6. The modular flow battery system according to claim 5, wherein, The gap hole of the first flow-blocking plate occupies 5% - 10% of the height of the flow-blocking plate from the cover plate along the first flow-blocking plate towards the bottom barrel wall, and the second flow-blocking plate occupies 5% - 10% of the height of the flow-blocking plate from the bottom barrel wall along the second flow-blocking plate towards the cover plate.

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