Modular all-vanadium redox flow battery system

Abstract

The application provides a modularized all-vanadium redox flow battery system, which comprises a positive electrode pressing frame, a negative electrode pressing frame, a plurality of conductive plates, a plurality of single cells and a plurality of locking mechanisms. The plurality of conductive plates are located between the positive electrode pressing frame and the negative electrode pressing frame. The single cell is installed between any two adjacent conductive plates. The single cell comprises a positive electrode frame, a plurality of positive electrode variable regions, a plurality of positive electrodes, a plurality of positive electrode adjusting components, a negative electrode frame, a plurality of negative electrode variable regions, a plurality of negative electrodes, a plurality of negative electrode adjusting components and an ion exchange component. The positive electrode adjusting component is configured to drive two positive electrodes in the corresponding positive electrode variable region to move towards each other or move away from each other along a first direction. The negative electrode adjusting component is configured to drive two negative electrodes in the corresponding negative electrode variable region to move towards each other or move away from each other along the first direction. The reaction rate of electrolyte at each electrode of the modularized all-vanadium redox flow battery system is substantially consistent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a modularized all-vanadium redox flow battery system. BACKGROUND

[0002] The all-vanadium redox flow battery is a kind of redox battery with vanadium as active substance in the form of circulating flow liquid. The vanadium battery stores electric energy in the form of chemical energy in the sulfuric acid electrolyte of different valence vanadium ions, and the electrolyte is pressed into the battery stack by an external pump. Under the action of mechanical power, the electrolyte circulates in the closed loop of different storage tanks and half cells. A proton exchange membrane is used as the separator of the battery pack. The electrolyte solution flows parallelly over the electrode surface and undergoes electrochemical reaction. The current is collected and conducted by double electrode plates, so that the chemical energy stored in the solution is converted into electric energy.

[0003] In the Chinese invention patent (application number: 200910078434.2), a kind of flow battery is disclosed. The flow battery solves the problem of low energy efficiency of flow battery by opening special electrolyte inlet and outlet branch flow channels and replacing flow guide net and turbulent flow net components with flow channels. However, in the actual application process, when the electrolyte flows on the electrode surface, the concentration of the reactants in the electrolyte will gradually decrease with the flow direction of the electrolyte, resulting in a large difference in reaction rate at different parts of the electrode, which will affect the performance of the all-vanadium redox flow battery. SUMMARY

[0004] The embodiment of the present application aims to provide a modular all-vanadium redox flow battery system to solve the technical problem that the concentration of reactants in electrolyte gradually decreases along the flow direction of electrolyte in the prior art. To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide a modular all-vanadium redox flow battery system, comprising: a positive electrode pressing frame; a negative electrode pressing frame; a plurality of conductive plates, the plurality of conductive plates are located between the positive electrode pressing frame and the negative electrode pressing frame; a plurality of single cells, the single cell is installed between any two adjacent conductive plates; the single cell comprises a positive electrode frame, a plurality of positive electrode variable regions, a plurality of positive electrodes, a plurality of positive electrode adjusting components, a negative electrode frame, a plurality of negative electrode variable regions, a plurality of negative electrodes, a plurality of negative electrode adjusting components and an ion exchange component, the plurality of positive electrode variable regions are opened in the positive electrode frame and are in communication with each other, two positive electrodes are arranged in each positive electrode variable region, the plurality of positive electrode adjusting components are installed on the positive electrode frame and are arranged one-to-one with the plurality of positive electrode variable regions, the positive electrode adjusting component is configured to drive the two positive electrodes in the corresponding positive electrode variable region to move towards each other or move away from each other along a first direction, the plurality of negative electrode variable regions are opened in the negative electrode frame and are in communication with each other, two negative electrodes are arranged in each negative electrode variable region, the plurality of negative electrode adjusting components are installed on the negative electrode frame and are arranged one-to-one with the plurality of negative electrode variable regions, the negative electrode adjusting component is configured to drive the two negative electrodes in the corresponding negative electrode variable region to move towards each other or move away from each other along a first direction, the ion exchange component is sealingly installed between the positive electrode frame and the negative electrode frame; a plurality of locking mechanisms, the plurality of locking mechanisms are arranged in the positive electrode pressing frame, the negative electrode pressing frame and the plurality of single cells, and are configured to lock the positive electrode pressing frame, the negative electrode pressing frame, the plurality of conductive plates and the plurality of single cells.

[0005] Optionally, the positive electrode frame comprises a positive electrode outer frame, a plurality of first positive electrode hollow frames and a plurality of first positive electrode clamping blocks, the plurality of first positive electrode hollow frames are connected in the positive electrode outer frame and are arranged at intervals, any two adjacent first positive electrode hollow frames and the positive electrode outer frame enclose the positive variable area, and the plurality of first positive electrode hollow frames have a plurality of first positive electrode clamping blocks on one side facing the positive variable area; the positive electrode comprises a positive flexible electrode and a plurality of first positive electrode clamping grooves, the positive flexible electrode has a plurality of first positive electrode clamping grooves on one side facing the first positive electrode hollow frame, and the plurality of first positive electrode clamping blocks are clamped in the plurality of first positive electrode clamping grooves and are arranged one by one corresponding to the plurality of first positive electrode clamping grooves; the negative electrode frame comprises a negative electrode outer frame, a plurality of first negative electrode hollow frames and a plurality of first negative electrode clamping blocks, the plurality of first negative electrode hollow frames are connected in the negative electrode outer frame and are arranged at intervals, any two adjacent first negative electrode hollow frames and the negative electrode outer frame enclose the negative variable area, and the plurality of first negative electrode hollow frames have a plurality of first negative electrode clamping blocks on one side facing the negative variable area; the negative electrode comprises a negative flexible electrode and a plurality of first negative electrode clamping grooves, the negative flexible electrode has a plurality of first negative electrode clamping grooves on one side facing the first negative electrode hollow frame, and the plurality of first negative electrode clamping blocks are clamped in the plurality of first negative electrode clamping grooves and are arranged one by one corresponding to the plurality of first negative electrode clamping grooves.

[0006] Optionally, the positive electrode adjusting assembly comprises a positive electrode adjusting piece, two second positive electrode hollow frames and a plurality of second positive electrode clamping blocks, the positive electrode adjusting piece is installed on the positive electrode outer frame and located between the two positive flexible electrodes, the two second positive electrode hollow frames are hinged to the positive electrode adjusting piece and configured to move towards each other or move away from each other along the first direction under the driving of the positive electrode adjusting piece, the side of the two second positive electrode hollow frames facing the positive flexible electrode is provided with a plurality of second positive electrode clamping blocks; the positive electrode further comprises a plurality of second positive electrode clamping grooves, the side of the positive flexible electrode facing the second positive electrode hollow frame is provided with a plurality of second positive electrode clamping grooves, a plurality of second positive electrode clamping blocks are clamped in the plurality of second positive electrode clamping grooves and arranged one by one corresponding to the plurality of second positive electrode clamping grooves; the negative electrode adjusting assembly comprises a negative electrode adjusting piece, two second negative electrode hollow frames and a plurality of second negative electrode clamping blocks, the negative electrode adjusting piece is installed on the negative electrode outer frame and located between the two negative flexible electrodes, the two second negative electrode hollow frames are hinged to the negative electrode adjusting piece and configured to move towards each other or move away from each other along the first direction under the driving of the negative electrode adjusting piece, the side of the two second negative electrode hollow frames facing the negative flexible electrode is provided with a plurality of second negative electrode clamping blocks; the negative electrode further comprises a plurality of second negative electrode clamping grooves, the side of the negative flexible electrode facing the second negative electrode hollow frame is provided with a plurality of second negative electrode clamping grooves, a plurality of second negative electrode clamping blocks are clamped in the plurality of second negative electrode clamping grooves and arranged one by one corresponding to the plurality of second negative electrode clamping grooves.

[0007] Optionally, the positive electrode adjusting member comprises a positive electrode adjusting rod, a plurality of first positive electrode hinged rods, a plurality of second positive electrode hinged rods, a positive electrode screw sleeve and a positive electrode limiting frame, the positive electrode adjusting rod is arranged through the positive electrode outer frame and is capable of sliding in the second direction, the first positive electrode hinged rods are hinged between the positive electrode adjusting rod and one of the second positive electrode hollow frames and are arranged at intervals, the second positive electrode hinged rods are hinged between the positive electrode adjusting rod and the other second positive electrode hollow frame and are arranged at intervals, the positive electrode screw sleeve is sleeved on one end of the positive electrode adjusting rod and is screwed with the positive electrode adjusting rod and is configured to drive the positive electrode adjusting rod to slide in the second direction when rotating in the second direction, and the positive electrode limiting frame is installed on the positive electrode outer frame and is sleeved on the positive electrode adjusting rod and is configured to limit the positive electrode screw sleeve; the negative electrode adjusting member comprises a negative electrode adjusting rod, a plurality of first negative electrode hinged rods, a plurality of second negative electrode hinged rods, a negative electrode screw sleeve and a negative electrode limiting frame, the negative electrode adjusting rod is arranged through the negative electrode outer frame and is capable of sliding in the second direction, the first negative electrode hinged rods are hinged between the negative electrode adjusting rod and one of the second negative electrode hollow frames and are arranged at intervals, the second negative electrode hinged rods are hinged between the negative electrode adjusting rod and the other second negative electrode hollow frame and are arranged at intervals, the negative electrode screw sleeve is sleeved on one end of the negative electrode adjusting rod and is screwed with the negative electrode adjusting rod and is configured to drive the negative electrode adjusting rod to slide in the second direction when rotating in the second direction, and the negative electrode limiting frame is installed on the negative electrode outer frame and is sleeved on the negative electrode adjusting rod and is configured to limit the negative electrode screw sleeve.

[0008] Optionally, the positive electrode further comprises a plurality of positive electrode flow channels, each of the plurality of positive electrode flow channels is arranged in the positive flexible electrode and extends along a first direction and is arranged at intervals along a second direction, and a cross section shape of the positive electrode flow channel perpendicular to the first direction is arranged as an arc shape or a trapezoidal shape; the positive electrode frame further comprises a plurality of first positive electrode avoidance grooves, each of the first positive electrode hollow frames is provided with a plurality of the first positive electrode avoidance grooves, and the plurality of the first positive electrode avoidance grooves and the plurality of the positive electrode flow channels on each of the first positive electrode hollow frames are arranged one by one in a one-to-one correspondence; the positive electrode adjusting assembly further comprises a plurality of second positive electrode avoidance grooves, each of the second positive electrode hollow frames is provided with a plurality of the second positive electrode avoidance grooves, and the plurality of the second positive electrode avoidance grooves and the plurality of the positive electrode flow channels on each of the second positive electrode hollow frames are arranged one by one in a one-to-one correspondence; the negative electrode further comprises a plurality of negative electrode flow channels, each of the plurality of negative electrode flow channels is arranged in the negative flexible electrode and extends along a first direction and is arranged at intervals along a second direction, and a cross section shape of the negative electrode flow channel perpendicular to the first direction is arranged as an arc shape or a trapezoidal shape; the negative electrode frame further comprises a plurality of first negative electrode avoidance grooves, each of the first negative electrode hollow frames is provided with a plurality of the first negative electrode avoidance grooves, and the plurality of the first negative electrode avoidance grooves and the plurality of the negative electrode flow channels on each of the first negative electrode hollow frames are arranged one by one in a one-to-one correspondence; the negative electrode adjusting assembly further comprises a plurality of second negative electrode avoidance grooves, each of the second negative electrode hollow frames is provided with a plurality of the second negative electrode avoidance grooves, and the plurality of the second negative electrode avoidance grooves and the plurality of the negative electrode flow channels on each of the second negative electrode hollow frames are arranged one by one in a one-to-one correspondence.

[0009] Optionally, the positive electrode frame further comprises a positive electrode liquid inlet flow channel, a positive electrode liquid outlet flow channel and two positive electrode cover plates, the positive electrode liquid inlet flow channel and the positive electrode liquid outlet flow channel are both arranged in the positive electrode outer frame and are both in communication with the positive electrode variable area, one of the positive electrode cover plates is arranged to seal the positive electrode liquid inlet flow channel, and the other of the positive electrode cover plates is arranged to seal the positive electrode liquid outlet flow channel, and the positive electrode liquid inlet flow channel and the positive electrode liquid outlet flow channel are both arranged in an S shape; the negative electrode frame further comprises a negative electrode liquid inlet flow channel, a negative electrode liquid outlet flow channel and two negative electrode cover plates, the negative electrode liquid inlet flow channel and the negative electrode liquid outlet flow channel are both arranged in the negative electrode outer frame and are both in communication with the negative electrode variable area, one of the negative electrode cover plates is arranged to seal the negative electrode liquid inlet flow channel, and the other of the negative electrode cover plates is arranged to seal the negative electrode liquid outlet flow channel, and the negative electrode liquid inlet flow channel and the negative electrode liquid outlet flow channel are both arranged in an S shape.

[0010] Optionally, the positive electrode frame further comprises two positive electrode ball valves, both of which are installed on the positive electrode outer frame, one of which is used to control the opening and closing of the positive electrode liquid inlet channel, and the other is used to control the opening and closing of the positive electrode liquid outlet channel; the negative electrode frame further comprises two negative electrode ball valves, both of which are installed on the negative electrode outer frame, one of which is used to control the opening and closing of the negative electrode liquid inlet channel, and the other is used to control the opening and closing of the negative electrode liquid outlet channel.

[0011] Optionally, the ion exchange assembly comprises an ion exchange membrane, a positive electrode gasket ring and a negative electrode gasket ring, the ion exchange membrane is located between the positive electrode frame and the negative electrode frame, the positive electrode gasket ring is sealingly installed between the positive electrode frame and the ion exchange membrane, and the negative electrode gasket ring is sealingly installed between the negative electrode frame and the ion exchange membrane.

[0012] Optionally, the positive electrode pressure frame comprises a positive electrode pressure plate, a positive electrode current collector, a positive electrode liquid inlet and a positive electrode liquid outlet, the positive electrode current collector is installed on the positive electrode pressure plate, and the positive electrode liquid inlet and the positive electrode liquid outlet are both installed on the positive electrode pressure plate; the negative electrode pressure frame comprises a negative electrode pressure plate, a negative electrode current collector, a negative electrode liquid inlet and a negative electrode liquid outlet, the negative electrode current collector is installed on the negative electrode pressure plate, and the negative electrode liquid inlet and the negative electrode liquid outlet are both installed on the negative electrode pressure plate.

[0013] Optionally, the locking mechanism comprises a locking screw, a positive electrode locking nut, a negative electrode locking nut, a positive electrode spring and a negative electrode spring, the locking screw is arranged through the positive electrode pressure frame, the negative electrode pressure frame and a plurality of the single cells, the positive electrode locking nut is screwed on the locking screw and located at one end of the locking screw close to the positive electrode pressure frame, the negative electrode locking nut is screwed on the locking screw and located at one end of the locking screw close to the negative electrode pressure frame, the positive electrode spring is sleeved on the locking screw and abuts between the positive electrode locking nut and the positive electrode pressure frame, and the negative electrode spring is sleeved on the locking screw and abuts between the negative electrode locking nut and the negative electrode pressure frame.

[0014] The modular all-vanadium redox flow battery system provided by the application has the beneficial effects that when the device is used, the reaction rate of the electrolyte at each part of the electrode can be kept consistent, the uniformity of the electrode reaction can be increased, the utilization rate of the electrode can be improved, the charge and discharge performance and energy efficiency of the all-vanadium redox flow battery can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0016] Figure 1 A perspective view of the modularized all-vanadium redox flow battery system provided by the present application;

[0017] Figure 2 A single cell perspective view of the modularized all-vanadium redox flow battery system provided by the present application;

[0018] Figure 3 An exploded view of the single cell of the modularized all-vanadium redox flow battery system provided by the present application;

[0019] Figure 4 A first perspective internal view of the modularized all-vanadium redox flow battery system provided by the present application;

[0020] Figure 5 A second perspective internal view of the modularized all-vanadium redox flow battery system provided by the present application;

[0021] Figure 6 A Figure 4 A local enlarged view of A in FIG. 1;

[0022] Figure 7 A Figure 5 A local enlarged view of B in FIG. 1;

[0023] Figure 8 A Figure 4 A local enlarged view of C in FIG. 1;

[0024] Figure 9 A Figure 5 A local enlarged view of D in FIG. 1;

[0025] Figure 10 An exploded view of the ion exchange assembly of the modularized all-vanadium redox flow battery system provided by the present application.

[0026] In the drawings, various reference signs represent:

[0027] 1, positive pressure frame; 11, positive pressure plate; 12, positive current collector; 13, positive inlet; 14, positive outlet;

[0028] 2, negative pressure frame; 21, negative pressure plate; 22, negative current collector; 23, negative inlet; 24, negative outlet;

[0029] 3, conductive plate;

[0030] 4, single cell; 41, positive electrode frame; 411, positive electrode outer frame; 412, first positive electrode hollow frame; 413, first positive electrode clamping block; 414, first positive electrode avoiding slot; 415, positive electrode liquid inlet flow channel; 416, positive electrode liquid outlet flow channel; 417, positive electrode ball valve; 42, positive electrode variable area; 43, positive electrode; 431, positive flexible electrode; 432, first positive electrode clamping slot; 433, second positive electrode clamping slot; 434, positive electrode flow channel; 44, positive electrode adjusting assembly; 441, positive electrode adjusting piece; 4411, positive electrode adjusting rod; 4412, first positive electrode hinged rod; 4413, second positive electrode hinged rod; 4414, positive electrode screw sleeve; 4415, positive electrode limiting frame; 442, second positive electrode hollow frame; 443, second positive electrode clamping block; 444, second positive electrode avoiding slot; 45, negative electrode frame; 451, negative electrode outer frame; 452, first negative electrode hollow frame; 453, first negative electrode clamping block; 454, first negative electrode avoiding slot; 455, negative electrode liquid inlet flow channel; 456, negative electrode liquid outlet flow channel; 457, negative electrode cover plate; 458, negative electrode ball valve; 46, negative electrode variable area; 47, negative electrode; 471, negative flexible electrode; 472, first negative electrode clamping slot; 473, second negative electrode clamping slot; 474, negative electrode flow channel; 48, negative electrode adjusting assembly; 481, negative electrode adjusting piece; 4811, negative electrode adjusting rod; 4812, first negative electrode hinged rod; 4813, second negative electrode hinged rod; 4814, negative electrode screw sleeve; 4815, negative electrode limiting frame; 482, second negative electrode hollow frame; 483, second negative electrode clamping block; 484, second negative electrode avoiding slot; 49, ion exchange assembly; 491, ion exchange membrane; 492, positive electrode gasket ring; 493, negative electrode gasket ring;

[0031] 5, locking mechanism; 51, locking screw; 52, positive electrode locking nut; 53, negative electrode locking nut; 54, positive electrode spring; 55, negative electrode spring. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "mounted on", "fixed on" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] As shown in the drawings, Figures 1 to 10 The present application provides a kind of modularization all-vanadium redox flow battery system, including positive pole pressure frame 1, negative pole pressure frame 2, multiple electrically conductive plates 3, multiple single cells 4 and multiple locking mechanisms 5. Multiple electrically conductive plates 3 are located between positive pole pressure frame 1 and negative pole pressure frame 2. Single cell 4 is installed between any two adjacent electrically conductive plates 3;Single cell 4 includes positive pole frame 41, multiple positive pole variable regions 42, multiple positive poles 43, multiple positive pole adjusting components 44, negative pole frame 45, multiple negative pole variable regions 46, multiple negative poles 47, multiple negative pole adjusting components 48 and ion exchange component 49, multiple positive pole variable regions 42 are all opened in positive pole frame 41, and are mutually communicated, two positive poles 43 are provided in each positive pole variable region 42, multiple positive pole adjusting components 44 are all installed in positive pole frame 41, and are set one by one with multiple positive pole variable regions 42, positive pole adjusting component 44 is configured to be able to drive two positive poles 43 in corresponding positive pole variable region 42 to move towards or move away from along the first direction, multiple negative pole variable regions 46 are all opened in negative pole frame 45, and are mutually communicated, two negative poles 47 are provided in each negative pole variable region 46, multiple negative pole adjusting components 48 are all installed in negative pole frame 45, and are set one by one with multiple negative pole variable regions 46, negative pole adjusting component 48 is configured to be able to drive two negative poles 47 in corresponding negative pole variable region 46 to move towards or move away from along the first direction, ion exchange component 49 is sealedly installed between positive pole frame 41 and negative pole frame 45. Multiple locking mechanisms 5 are threaded in positive pole pressure frame 1, negative pole pressure frame 2 and multiple single cells 4, and are configured to lock positive pole pressure frame 1, negative pole pressure frame 2, multiple electrically conductive plates 3 and multiple single cells 4 with each other.

[0037] It needs to be explained here that in the present embodiment, the number of single cells 4 is N, and the number of conductive plates 3 is N+1. It also needs to be explained here that in the present embodiment, the number of positive variable regions 42 and the number of negative variable regions 46 are both set to two. Of course, in other embodiments, the number of positive variable regions 42 and the number of negative variable regions 46 can also be set to three, four, five, or other numbers, which are not limited to be two.

[0038] The modularized all-vanadium redox flow battery system provided in the present application can be used as follows. When the device is used, the worker can stretch or squeeze the two positive electrodes 43 in the positive variable region 42 through the positive electrode adjusting assembly 44, and the worker can stretch or squeeze the two negative electrodes 47 in the negative variable region 46 through the negative electrode adjusting assembly 48. According to the flow direction of the electrode liquid, the worker can gradually increase the specific surface area of the plurality of positive electrodes 43, and also gradually increase the specific surface area of the plurality of negative electrodes 47, so as to make the reaction rate of the electrolyte at each electrode substantially consistent, to increase the uniformity of the electrode reaction, to help improve the utilization rate of the electrode, and to help improve the charge-discharge performance and energy efficiency of the all-vanadium redox flow battery.

[0039] Optionally, the single cell 4 further comprises a plurality of metal foils (not shown in the figure), and a metal foil is connected between any two adjacent positive electrodes 43, and a metal foil is connected between any two adjacent negative electrodes 47.

[0040] In an embodiment of the present application, please refer to Figures 1 to 10The positive electrode frame 41 comprises a positive outer frame 411, a plurality of first positive hollow frames 412 and a plurality of first positive clamping blocks 413. The plurality of first positive hollow frames 412 are connected to the positive outer frame 411 and are arranged at intervals. Any two adjacent first positive hollow frames 412 and the positive outer frame 411 enclose a positive variable area 42. The plurality of first positive hollow frames 412 have a plurality of first positive clamping blocks 413 on the side facing the positive variable area 42. The positive electrode 43 comprises a positive flexible electrode 431 and a plurality of first positive clamping grooves 432. The positive flexible electrode 431 has a plurality of first positive clamping grooves 432 on the side facing the first positive hollow frame 412. The plurality of first positive clamping blocks 413 are clamped in the plurality of first positive clamping grooves 432 and are arranged one-to-one with the plurality of first positive clamping grooves 432. The negative electrode frame 45 comprises a negative outer frame 451, a plurality of first negative hollow frames 452 and a plurality of first negative clamping blocks 453. The plurality of first negative hollow frames 452 are connected to the negative outer frame 451 and are arranged at intervals. Any two adjacent first negative hollow frames 452 and the negative outer frame 451 enclose a negative variable area 46. The plurality of first negative hollow frames 452 have a plurality of first negative clamping blocks 453 on the side facing the negative variable area 46. The negative electrode 47 comprises a negative flexible electrode 471 and a plurality of first negative clamping grooves 472. The negative flexible electrode 471 has a plurality of first negative clamping grooves 472 on the side facing the first negative hollow frame 452. The plurality of first negative clamping blocks 453 are clamped in the plurality of first negative clamping grooves 472 and are arranged one-to-one with the plurality of first negative clamping grooves 472.

[0041] Thus, when the positive electrode adjusting assembly 44 is used, the positive flexible electrode 431 can be connected with the first positive electrode hollow frame 412 through the first positive electrode clamping block 413 and the first positive electrode clamping groove 432, which helps to improve the structural stability between the positive flexible electrode 431 and the first positive electrode hollow frame 412, and the first positive electrode hollow frame 412 can limit the positive flexible electrode 431 in the first direction, so that the positive electrode adjusting assembly 44 can normally stretch or extrude the positive flexible electrode 431. When the negative electrode adjusting assembly 48 is used, the negative flexible electrode 471 can be connected with the first negative electrode hollow frame 452 through the first negative electrode clamping block 453 and the first negative electrode clamping groove 472, which helps to improve the structural stability between the negative flexible electrode 471 and the first negative electrode hollow frame 452, and the first negative electrode hollow frame 452 can limit the negative flexible electrode 471 in the first direction, so that the negative electrode adjusting assembly 48 can normally stretch or extrude the negative flexible electrode 471. During use, the first positive electrode hollow frame 412 can not only limit the positive flexible electrode 431, but also avoid the electrolyte flowing through the positive flexible electrode 431. During use, the first negative electrode hollow frame 452 can not only limit the negative flexible electrode 471, but also avoid the electrolyte flowing through the negative flexible electrode 471.

[0042] In an embodiment of the present application, please refer to Figures 1 to 10The positive electrode adjusting assembly 44 comprises a positive electrode adjusting piece 441, two second positive electrode hollow frames 442, and a plurality of second positive electrode clamping blocks 443. The positive electrode adjusting piece 441 is installed on the positive electrode outer frame 411 and located between the two positive flexible electrodes 431. The two second positive electrode hollow frames 442 are hinged to the positive electrode adjusting piece 441 and configured to move towards or away from each other along the first direction under the driving of the positive electrode adjusting piece 441. The side of each of the two second positive electrode hollow frames 442 facing the positive flexible electrode 431 is provided with a plurality of second positive electrode clamping blocks 443. The positive electrode 43 further comprises a plurality of second positive electrode clamping grooves 433. The side of each of the positive flexible electrodes 431 facing the second positive electrode hollow frame 442 is provided with a plurality of second positive electrode clamping grooves 433. The plurality of second positive electrode clamping blocks 443 are clamped in the plurality of second positive electrode clamping grooves 433 and correspond to the plurality of second positive electrode clamping grooves 433 one by one.

[0043] Thus, when the positive electrode adjusting assembly 44 is used, the positive flexible electrode 431 can be connected with the second positive electrode hollow frame 442 through the second positive electrode clamping block 443 and the second positive electrode clamping groove 433, which helps to improve the structural stability between the positive flexible electrode 431 and the second positive electrode hollow frame 442, and the second positive electrode hollow frame 442 can limit the positive flexible electrode 431 in the first direction, so that the positive electrode adjusting assembly 44 can normally stretch or extrude the positive flexible electrode 431. When the negative electrode adjusting assembly 48 is used, the negative flexible electrode 471 can be connected with the second negative electrode hollow frame 482 through the second negative electrode clamping block 483 and the second negative electrode clamping groove 473, which helps to improve the structural stability between the negative flexible electrode 471 and the second negative electrode hollow frame 482, and the second negative electrode hollow frame 482 can limit the negative flexible electrode 471 in the first direction, so that the negative electrode adjusting assembly 48 can normally stretch or extrude the negative flexible electrode 471. When adjusting the specific surface area of the positive electrode 43, the two second positive electrode hollow frames 442 can be moved towards or away from each other in the first direction through the positive electrode adjusting piece 441, and under the cooperation of the second positive electrode clamping block 443 and the second positive electrode clamping groove 433, the two positive electrodes 43 can be stretched or extruded, so that the specific surface area of the positive electrode 43 can be adjusted conveniently. When adjusting the specific surface area of the negative electrode 47, the two second negative electrode hollow frames 482 can be moved towards or away from each other in the first direction through the negative electrode adjusting piece 481, and under the cooperation of the second negative electrode clamping block 483 and the second negative electrode clamping groove 473, the two negative electrodes 47 can be stretched or extruded, so that the specific surface area of the negative electrode 47 can be adjusted conveniently.

[0044] In one embodiment of the present application, referring to Figures 1 to 10The positive electrode adjusting member 441 comprises a positive electrode adjusting rod 4411, a plurality of first positive electrode hinged rods 4412, a plurality of second positive electrode hinged rods 4413, a positive electrode screw sleeve 4414 and a positive electrode limiting frame 4415. The positive electrode adjusting rod 4411 penetrates through the positive electrode outer frame 411 and is capable of sliding in the second direction. The plurality of first positive electrode hinged rods 4412 are hinged between the positive electrode adjusting rod 4411 and one of the second positive electrode hollow frames 442 and are arranged at intervals. The plurality of second positive electrode hinged rods 4413 are hinged between the positive electrode adjusting rod 4411 and the other second positive electrode hollow frame 442 and are arranged at intervals. The positive electrode screw sleeve 4414 is sleeved on one end of the positive electrode adjusting rod 4411 and is screwed to the positive electrode adjusting rod 4411 and is configured to drive the positive electrode adjusting rod 4411 to slide in the second direction when rotating around the second direction. The positive electrode limiting frame 4415 is installed on the positive electrode outer frame 411 and is sleeved on the positive electrode adjusting rod 4411 and is configured to limit the positive electrode screw sleeve 4414. The negative electrode adjusting member 481 comprises a negative electrode adjusting rod 4811, a plurality of first negative electrode hinged rods 4812, a plurality of second negative electrode hinged rods 4813, a negative electrode screw sleeve 4814 and a negative electrode limiting frame 4815. The negative electrode adjusting rod 4811 penetrates through the negative electrode outer frame 451 and is capable of sliding in the second direction. The plurality of first negative electrode hinged rods 4812 are hinged between the negative electrode adjusting rod 4811 and one of the second negative electrode hollow frames 482 and are arranged at intervals. The plurality of second negative electrode hinged rods 4813 are hinged between the negative electrode adjusting rod 4811 and the other second negative electrode hollow frame 482 and are arranged at intervals. The negative electrode screw sleeve 4814 is sleeved on one end of the negative electrode adjusting rod 4811 and is screwed to the negative electrode adjusting rod 4811 and is configured to drive the negative electrode adjusting rod 4811 to slide in the second direction when rotating around the second direction. The negative electrode limiting frame 4815 is installed on the negative electrode outer frame 451 and is sleeved on the negative electrode adjusting rod 4811 and is configured to limit the negative electrode screw sleeve 4814.

[0045] Thus, when adjusting the specific surface area of the positive electrode 43, the worker can rotate the positive screw sleeve 4414 to rotate the first positive hinged rod 4412 and the second positive hinged rod 4413 towards each other or away from each other, thereby driving the two positive electrodes 43 to move towards each other or away from each other in the first direction, and further stretching or pressing the two positive electrodes 43, which is convenient to adjust. When adjusting the specific surface area of the negative electrode 47, the worker can rotate the negative screw sleeve 4814 to rotate the first negative hinged rod 4812 and the second negative hinged rod 4813 towards each other or away from each other, thereby driving the two negative electrodes 47 to move towards each other or away from each other in the first direction, and further stretching or pressing the two negative electrodes 47, which is convenient to adjust. The positive limiting frame 4415 can limit the positive screw sleeve 4414, so that the positive screw sleeve 4414 can only rotate around the second direction, which helps to improve the structural stability between the positive screw sleeve 4414 and the positive outer frame 411, and facilitates the positive screw sleeve 4414 to drive the positive adjusting rod 4411 to move in the second direction. The negative limiting frame 4815 can limit the negative screw sleeve 4814, so that the negative screw sleeve 4814 can only rotate around the second direction, which helps to improve the structural stability between the negative screw sleeve 4814 and the negative outer frame 451, and facilitates the negative screw sleeve 4814 to drive the negative adjusting rod 4811 to move in the second direction.

[0046] In an embodiment of the present application, please refer to Figures 1 to 10The positive electrode 43 further comprises a plurality of positive electrode flow channels 434, each of which is formed in the positive flexible electrode 431 and extends along the first direction and is spaced along the second direction. The cross-sectional shape of the positive electrode flow channel 434 perpendicular to the first direction is arc-shaped or trapezoidal. The positive electrode frame 41 further comprises a plurality of first positive electrode avoidance grooves 414, each of which is formed in each first positive electrode hollow frame 412. The plurality of first positive electrode avoidance grooves 414 on each first positive electrode hollow frame 412 and the plurality of positive electrode flow channels 434 are one-to-one corresponding. The positive electrode adjusting assembly 44 further comprises a plurality of second positive electrode avoidance grooves 444, each of which is formed in each second positive electrode hollow frame 442. The plurality of second positive electrode avoidance grooves 444 on each second positive electrode hollow frame 442 and the plurality of positive electrode flow channels 434 are one-to-one corresponding. The negative electrode 47 further comprises a plurality of negative electrode flow channels 474, each of which is formed in the negative flexible electrode 471 and extends along the first direction and is spaced along the second direction. The cross-sectional shape of the negative electrode flow channel 474 perpendicular to the first direction is arc-shaped or trapezoidal. The negative electrode frame 45 further comprises a plurality of first negative electrode avoidance grooves 454, each of which is formed in each first negative electrode hollow frame 452. The plurality of first negative electrode avoidance grooves 454 on each first negative electrode hollow frame 452 and the plurality of negative electrode flow channels 474 are one-to-one corresponding. The negative electrode adjusting assembly 48 further comprises a plurality of second negative electrode avoidance grooves 484, each of which is formed in each second negative electrode hollow frame 482. The plurality of second negative electrode avoidance grooves 484 on each second negative electrode hollow frame 482 and the plurality of negative electrode flow channels 474 are one-to-one corresponding.

[0047] In this way, by opening a plurality of positive electrode flow channels 434 on the surface of the positive electrode 43, the electrolyte can be uniformly distributed on the surface of the positive flexible electrode 431, and the electrolyte can take away the heat generated by the reaction, facilitating heat dissipation. Since the cross-sectional shape of the positive electrode flow channel 434 perpendicular to the first direction is arc-shaped or trapezoidal, when the positive flexible electrode 431 is extruded, the positive electrode flow channel 434 can be completely blocked due to extrusion, ensuring that the electrolyte can flow normally on the surface of the positive flexible electrode 431. During use, by means of the first positive electrode avoidance groove 414 and the second positive electrode avoidance groove 444, the electrolyte can be avoided, so that the electrolyte can flow normally through the positive electrode flow channel 434, avoiding the interference of the first positive electrode hollow frame 412 and the second positive electrode hollow frame 442 with the flow of the electrolyte. By opening a plurality of negative electrode flow channels 474 on the surface of the negative electrode 47, the electrolyte can be uniformly distributed on the surface of the negative flexible electrode 471, and the electrolyte can take away the heat generated by the reaction, facilitating heat dissipation. Since the cross-sectional shape of the negative electrode flow channel 474 perpendicular to the first direction is arc-shaped or trapezoidal, when the negative flexible electrode 471 is extruded, the negative electrode flow channel 474 can be completely blocked due to extrusion, ensuring that the electrolyte can flow normally on the surface of the negative flexible electrode 471. During use, by means of the first negative electrode avoidance groove 454 and the second negative electrode avoidance groove 484, the electrolyte can be avoided, so that the electrolyte can flow normally through the negative electrode flow channel 474, avoiding the interference of the first negative electrode hollow frame 452 and the second negative electrode hollow frame 482 with the flow of the electrolyte.

[0048] In one embodiment of the present application, please refer to Figures 1 to 10 The positive electrode frame 41 further comprises a positive electrode liquid inlet flow channel 415, a positive electrode liquid outlet flow channel 416 and two positive electrode cover plates (not shown in the figure), the positive electrode liquid inlet flow channel 415 and the positive electrode liquid outlet flow channel 416 are both opened in the positive electrode outer frame 411 and are both in communication with the positive electrode variable area 42, one of the positive electrode cover plates is sealingly provided on the positive electrode liquid inlet flow channel 415, and the other positive electrode cover plate is sealingly provided on the positive electrode liquid outlet flow channel 416, and the positive electrode liquid inlet flow channel 415 and the positive electrode liquid outlet flow channel 416 are both arranged in an S shape.

[0049] Thus, since the positive electrode liquid inlet flow channel 415 and the positive electrode liquid outlet flow channel 416 are both arranged in an S shape, compared with the related art, the flow path length of the electrolyte in the positive electrode frame 41 is greatly increased, so that the electrolyte can be fully reacted in the positive electrode frame 41, and the energy efficiency of the all-vanadium redox flow battery is greatly improved. Through the two positive electrode cover plates, the positive electrode liquid inlet flow channel 415 and the positive electrode liquid outlet flow channel 416 can be sealed to prevent the electrolyte from overflowing from the positive electrode liquid inlet flow channel 415 and the positive electrode liquid outlet flow channel 416, and the sealing effect is good. Since the negative electrode liquid inlet flow channel 455 and the negative electrode liquid outlet flow channel 456 are both arranged in an S shape, compared with the related art, the flow path length of the electrolyte in the negative electrode frame 45 is greatly increased, so that the electrolyte can be fully reacted in the negative electrode frame 45, and the energy efficiency of the all-vanadium redox flow battery is greatly improved. Through the two negative electrode cover plates 457, the negative electrode liquid inlet flow channel 455 and the negative electrode liquid outlet flow channel 456 can be sealed to prevent the electrolyte from overflowing from the negative electrode liquid inlet flow channel 455 and the negative electrode liquid outlet flow channel 456, and the sealing effect is good.

[0050] In an embodiment of the present application, referring to Figures 1 to 10 The positive electrode frame 41 further comprises two positive electrode ball valves 417, both of which are installed on the positive electrode outer frame 411, one of which is used to control the on-off of the positive electrode liquid inlet flow channel 415, and the other is used to control the on-off of the positive electrode liquid outlet flow channel 416. The negative electrode frame 45 further comprises two negative electrode ball valves 458, both of which are installed on the negative electrode outer frame 451, one of which is used to control the on-off of the negative electrode liquid inlet flow channel 455, and the other is used to control the on-off of the negative electrode liquid outlet flow channel 456.

[0051] Thus, when a single cell 4 fails, through the two positive electrode ball valves 417 and the two negative electrode ball valves 458, the failed single cell 4 can be isolated from the plurality of single cells 4, and the electrolyte can be prevented from entering the failed single cell 4, compared with the related art, which can avoid the all-vanadium redox flow battery from being affected during use.

[0052] In an embodiment of the present application, referring to Figures 1 to 10 The ion exchange assembly 49 comprises an ion exchange membrane 491, a positive electrode gasket ring 492 and a negative electrode gasket ring 493, the ion exchange membrane 491 is located between the positive electrode frame 41 and the negative electrode frame 45, the positive electrode gasket ring 492 is sealingly installed between the positive electrode frame 41 and the ion exchange membrane 491, and the negative electrode gasket ring 493 is sealingly installed between the negative electrode frame 45 and the ion exchange membrane 491.

[0053] In this way, the electrolyte can be prevented from leaking between the ion exchange membrane 491 and the positive outer frame 411 by the positive sealing gasket ring 492, and the sealing effect is good. The electrolyte can be prevented from leaking between the ion exchange membrane 491 and the negative outer frame 451 by the negative sealing gasket ring 493, and the sealing effect is good.

[0054] In an embodiment of the present application, please refer to Figures 1 to 10 The positive pressure frame 1 includes a positive pressure plate 11, a positive current collector 12, a positive liquid inlet 13, and a positive liquid outlet 14. The positive current collector 12 is installed on the positive pressure plate 11. The positive liquid inlet 13 and the positive liquid outlet 14 are both installed on the positive pressure plate 11. The negative pressure frame 2 includes a negative pressure plate 21, a negative current collector 22, a negative liquid inlet 23, and a negative liquid outlet 24. The negative current collector 22 is installed on the negative pressure plate 21. The negative liquid inlet 23 and the negative liquid outlet 24 are both installed on the negative pressure plate 21.

[0055] In this way, the electrolyte can be input into the plurality of positive liquid inlet flow channels 415 through the positive liquid inlet 13. The electrolyte can be output to the positive liquid outlet 14 through the plurality of positive liquid outlet flow channels 416, so that the electrolyte can be circulated and transported. The electrolyte can be input into the plurality of negative liquid inlet flow channels 455 through the negative liquid inlet 23. The electrolyte can be output to the negative liquid outlet 24 through the plurality of negative liquid outlet flow channels 456, so that the electrolyte can be circulated and transported.

[0056] In an embodiment of the present application, please refer to Figures 1 to 10 The locking mechanism 5 includes a locking screw 51, a positive locking nut 52, a negative locking nut 53, a positive spring 54, and a negative spring 55. The locking screw 51 is arranged through the positive pressure frame 1, the negative pressure frame 2, and the plurality of single batteries 4. The positive locking nut 52 is screwed onto the locking screw 51 and located at one end of the locking screw 51 close to the positive pressure frame 1. The negative locking nut 53 is screwed onto the locking screw 51 and located at one end of the locking screw 51 close to the negative pressure frame 2. The positive spring 54 is sleeved on the locking screw 51 and abuts between the positive locking nut 52 and the positive pressure frame 1. The negative spring 55 is sleeved on the locking screw 51 and abuts between the negative locking nut 53 and the negative pressure frame 2.

[0057] In this way, the positive pressure frame 1, the negative pressure frame 2, and the plurality of single batteries 4 can be locked under the joint action of the locking screw 51, the positive locking nut 52, and the negative locking nut 53, and the locking effect is good. Moreover, a pre-stress can be applied to the positive pressure frame 1 and the negative pressure frame 2 by the positive spring 54 and the negative spring 55, which helps to further improve the locking effect of the locking mechanism 5.

[0058] The working principle of the modularized all-vanadium redox flow battery system provided in the application is as follows: first, it needs to be pointed out that the first direction above and below refers to the bidirectional direction of the shortest connection line between the positive electrodes 43, specifically the X-axis shown in Figure 4 The second direction above and below refers to the bidirectional direction of the shortest connection line between the positive electrode frame 41 and the negative electrode frame 45, specifically the Y-axis shown in Figure 4 The positive electrolyte is input at the positive liquid inlet 13 and transported to the plurality of positive liquid inlet flow channels 415 through the positive liquid inlet 13. After entering the positive liquid inlet flow channels 415, the positive electrolyte flows through the plurality of positive variable regions 42, then flows into the positive liquid outlet flow channels 416, and finally is output from the positive liquid outlet flow channels 416 to the positive liquid outlet 14. The negative electrolyte is input at the negative liquid inlet 23 and transported to the plurality of negative liquid inlet flow channels 455 through the negative liquid inlet 23. After entering the negative liquid inlet flow channels 455, the negative electrolyte flows through the plurality of negative variable regions 46, then flows into the negative liquid outlet flow channels 456, and finally is output from the negative liquid outlet flow channels 456 to the negative liquid outlet 24. The worker rotates the positive screw sleeve 4414 close to the positive liquid inlet flow channel 415 to make the positive adjusting rod 4411 move along the second direction, the positive adjusting rod 4411 drives the first positive hinged rod 4412 and the second positive hinged rod 4413 to rotate away from each other, so that the two second positive hollow frames 442 close to the positive liquid inlet flow channel 415 can move away from each other along the first direction, and then the two positive flexible electrodes 431 close to the positive liquid inlet flow channel 415 can be squeezed, and the specific surface area of the two positive flexible electrodes 431 close to the positive liquid inlet flow channel 415 is reduced. The worker rotates the positive screw sleeve 4414 close to the positive liquid outlet flow channel 416 to make the positive adjusting rod 4411 move along the second direction, the positive adjusting rod 4411 drives the first positive hinged rod 4412 and the second positive hinged rod 4413 to rotate towards each other, so that the two second positive hollow frames 442 close to the positive liquid outlet flow channel 416 can move towards each other along the first direction, and then the two positive flexible electrodes 431 close to the positive liquid inlet flow channel 415 can be stretched, and the specific surface area of the two positive flexible electrodes 431 close to the positive liquid outlet flow channel 416 is increased. The negative flexible electrode 471 is adjusted in the same way.

[0059] One or more embodiments in the application are intended to cover all such alternatives, modifications and variations falling within the broad scope of the application. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principles of one or more embodiments in the application shall be included in the protection scope of the application.

Claims

1. A modular all-vanadium redox flow battery system, characterized by, Include: Positive pressure frame (1); Negative pressure frame (2); Multiple conductive plates (3), multiple conductive plates (3) are located between the positive pressure frame (1) and the negative pressure frame (2); Multiple single cells (4), any two adjacent conductive plates (3) are installed with the single cell (4); The single cell (4) includes a positive frame (41), a plurality of positive variable regions (42), a plurality of positive electrodes (43), a plurality of positive adjustment components (44), a negative frame (45), a plurality of negative variable regions (46), a plurality of negative electrodes (47), a plurality of negative adjustment components (48) and ion exchange components (49), a plurality of positive variable regions (42) are opened in the positive frame (41), and are communicated with each other, two positive electrodes (43) are arranged in each positive variable region (42), a plurality of positive adjustment components (44) are installed on the positive frame (41), and are arranged one by one with a plurality of positive variable regions (42), the positive adjustment component (44) is configured to drive two positive electrodes (43) in the corresponding positive variable region (42) to move towards or move away from each other along the first direction, a plurality of negative variable regions (46) are opened in the negative frame (45), and are communicated with each other, two negative electrodes (47) are arranged in each negative variable region (46), a plurality of negative adjustment components (48) are installed on the negative frame (45), and are arranged one by one with a plurality of negative variable regions (46), the negative adjustment component (48) is configured to drive two negative electrodes (47) in the corresponding negative variable region (46) to move towards or move away from each other along the first direction, the ion exchange component (49) is sealedly installed between the positive frame (41) and the negative frame (45); Multiple locking mechanisms (5), multiple locking mechanisms (5) are provided in the positive pressure frame (1), the negative pressure frame (2) and multiple single cells (4), and are configured to lock the positive pressure frame (1), the negative pressure frame (2), multiple conductive plates (3) and multiple single cells (4) with each other; The positive frame (41) includes a positive outer frame (411), a plurality of first positive hollow frames (412) and a plurality of first positive clamping blocks (413), the positive electrode (43) includes a positive flexible electrode (431) and a plurality of first positive clamping grooves (432); The negative frame (45) includes a negative outer frame (451), a plurality of first negative hollow frames (452) and a plurality of first negative clamping blocks (453), the negative electrode (47) includes a negative flexible electrode (471) and a plurality of first negative clamping grooves (472); The positive electrode adjusting assembly (44) comprises a positive electrode adjusting piece (441), two second positive electrode hollow frames (442) and a plurality of second positive electrode clamping blocks (443), and the positive electrode (43) further comprises a plurality of second positive electrode clamping grooves (433); the negative electrode adjusting assembly (48) comprises a negative electrode adjusting piece (481), two second negative electrode hollow frames (482) and a plurality of second negative electrode clamping blocks (483), and the negative electrode (47) further comprises a plurality of second negative electrode clamping grooves (473); The positive electrode (43) further comprises a plurality of positive electrode flow channels (434), each of the plurality of positive electrode flow channels (434) is arranged on the positive flexible electrode (431) and extends along a first direction and is arranged at intervals along a second direction, and a cross-sectional shape of the positive electrode flow channel (434) perpendicular to the first direction is arranged as an arc or a trapezoid; The negative electrode (47) further comprises a plurality of negative electrode flow channels (474), each of the plurality of negative electrode flow channels (474) is arranged on the negative flexible electrode (471) and extends along a first direction and is arranged at intervals along a second direction, and a cross-sectional shape of the negative electrode flow channel (474) perpendicular to the first direction is arranged as an arc or a trapezoid.

2. The modularized all-vanadium redox flow battery system of claim 1, wherein, Each of the plurality of first positive electrode hollow frames (412) is connected to the positive electrode outer frame (411) and is arranged at intervals, and any two adjacent first positive electrode hollow frames (412) and the positive electrode outer frame (411) form the positive electrode variable area (42), and each of the plurality of first positive electrode hollow frames (412) has a plurality of first positive electrode clamping blocks (413) on a side facing the positive electrode variable area (42); The positive flexible electrode (431) has a plurality of first positive electrode clamping grooves (432) on a side facing the first positive electrode hollow frame (412), and the plurality of first positive electrode clamping blocks (413) are clamped in the plurality of first positive electrode clamping grooves (432) and are arranged one by one corresponding to the plurality of first positive electrode clamping grooves (432); Each of the plurality of first negative electrode hollow frames (452) is connected to the negative electrode outer frame (451) and is arranged at intervals, and any two adjacent first negative electrode hollow frames (452) and the negative electrode outer frame (451) form the negative electrode variable area (46), and each of the plurality of first negative electrode hollow frames (452) has a plurality of first negative electrode clamping blocks (453) on a side facing the negative electrode variable area (46); The negative flexible electrode (471) has a plurality of first negative electrode clamping grooves (472) on a side facing the first negative electrode hollow frame (452), and the plurality of first negative electrode clamping blocks (453) are clamped in the plurality of first negative electrode clamping grooves (472) and are arranged one by one corresponding to the plurality of first negative electrode clamping grooves (472).

3. The modularized all-vanadium redox flow battery system of claim 2, wherein, The positive electrode adjusting piece (441) is installed on the positive electrode outer frame (411) and located between the two positive flexible electrodes (431). The two second positive electrode hollow frames (442) are hinged to the positive electrode adjusting piece (441) and configured to move towards or away from each other in the first direction under the driving of the positive electrode adjusting piece (441). The side of the two second positive electrode hollow frames (442) facing the positive flexible electrode (431) is provided with a plurality of second positive electrode clamping blocks (443). The side of the positive flexible electrode (431) facing the second positive electrode hollow frame (442) is provided with a plurality of second positive electrode clamping grooves (433). The plurality of second positive electrode clamping blocks (443) are clamped in the plurality of second positive electrode clamping grooves (433) and correspondingly arranged with the plurality of second positive electrode clamping grooves (433). The negative electrode adjusting piece (481) is installed on the negative electrode outer frame (451) and located between the two negative flexible electrodes (471). The two second negative electrode hollow frames (482) are hinged to the negative electrode adjusting piece (481) and configured to move towards or away from each other in the first direction under the driving of the negative electrode adjusting piece (481). The side of the two second negative electrode hollow frames (482) facing the negative flexible electrode (471) is provided with a plurality of second negative electrode clamping blocks (483). The side of the negative flexible electrode (471) facing the second negative electrode hollow frame (482) is provided with a plurality of second negative electrode clamping grooves (473). The plurality of second negative electrode clamping blocks (483) are clamped in the plurality of second negative electrode clamping grooves (473) and correspondingly arranged with the plurality of second negative electrode clamping grooves (473).

4. The modular vanadium redox flow battery system of claim 3, wherein, The positive electrode adjusting piece (441) includes a positive electrode adjusting rod (4411), a first positive electrode hinge rod (4412), a second positive electrode hinge rod (4413), a positive electrode screw sleeve (4414), and a positive electrode limiting frame (4415). The positive electrode adjusting rod (4411) is arranged in the positive electrode outer frame (411) and can slide in the second direction. The plurality of first positive electrode hinge rods (4412) are hinged between the positive electrode adjusting rod (4411) and one of the second positive electrode hollow frames (442) and are arranged at intervals. The plurality of second positive electrode hinge rods (4413) are hinged between the positive electrode adjusting rod (4411) and the other second positive electrode hollow frame (442) and are arranged at intervals. The positive electrode screw sleeve (4414) is sleeved on one end of the positive electrode adjusting rod (4411) and screwed on the positive electrode adjusting rod (4411) and configured to drive the positive electrode adjusting rod (4411) to slide in the second direction when rotating in the second direction. The positive electrode limiting frame (4415) is installed on the positive electrode outer frame (411) and sleeved on the positive electrode adjusting rod (4411) and configured to limit the positive electrode screw sleeve (4414). The negative electrode adjusting piece (481) comprises a negative electrode adjusting rod (4811), a first negative electrode hinged rod (4812), a second negative electrode hinged rod (4813), a negative electrode screw sleeve (4814), and a negative electrode limiting frame (4815). The negative electrode adjusting rod (4811) is arranged in the negative electrode outer frame (451) and can slide in the second direction. The first negative electrode hinged rod (4812) is hinged between the negative electrode adjusting rod (4811) and one of the second negative electrode hollow frames (482) and is arranged at intervals. The second negative electrode hinged rod (4813) is hinged between the negative electrode adjusting rod (4811) and the other second negative electrode hollow frame (482) and is arranged at intervals. The negative electrode screw sleeve (4814) is arranged at one end of the negative electrode adjusting rod (4811) and is screwed to the negative electrode adjusting rod (4811) and is configured to drive the negative electrode adjusting rod (4811) to slide in the second direction when rotating in the second direction. The negative electrode limiting frame (4815) is mounted on the negative electrode outer frame (451) and is arranged in the negative electrode adjusting rod (4811) and is configured to limit the negative electrode screw sleeve (4814).

5. The modularized all-vanadium redox flow battery system of claim 3, wherein, The positive electrode frame (41) further comprises a plurality of first positive electrode avoiding grooves (414), each of the first positive electrode hollow frames (412) is provided with a plurality of first positive electrode avoiding grooves (414), and the first positive electrode avoiding grooves (414) and the positive electrode flow channels (434) on each of the first positive electrode hollow frames (412) are arranged one by one in a corresponding manner. The positive electrode adjusting assembly (44) further comprises a plurality of second positive electrode avoiding grooves (444), each of the second positive electrode hollow frames (442) is provided with a plurality of second positive electrode avoiding grooves (444), and the second positive electrode avoiding grooves (444) and the positive electrode flow channels (434) on each of the second positive electrode hollow frames (442) are arranged one by one in a corresponding manner. The negative electrode frame (45) further comprises a plurality of first negative electrode avoiding grooves (454), each of the first negative electrode hollow frames (452) is provided with a plurality of first negative electrode avoiding grooves (454), and the first negative electrode avoiding grooves (454) and the negative electrode flow channels (474) on each of the first negative electrode hollow frames (452) are arranged one by one in a corresponding manner. The negative electrode adjusting assembly (48) further comprises a plurality of second negative electrode avoiding grooves (484), each of the second negative electrode hollow frames (482) is provided with a plurality of second negative electrode avoiding grooves (484), and the second negative electrode avoiding grooves (484) and the negative electrode flow channels (474) on each of the second negative electrode hollow frames (482) are arranged one by one in a corresponding manner.

6. The modularized vanadium redox flow battery system of claim 2, wherein, The positive electrode frame (41) further comprises a positive electrode liquid inlet flow channel (415), a positive electrode liquid outlet flow channel (416) and two positive electrode cover plates, the positive electrode liquid inlet flow channel (415) and the positive electrode liquid outlet flow channel (416) are both arranged in the positive electrode outer frame (411) and are both in communication with the positive electrode variable area (42), one of the positive electrode cover plates is arranged on the positive electrode liquid inlet flow channel (415), the other positive electrode cover plate is arranged on the positive electrode liquid outlet flow channel (416), and the positive electrode liquid inlet flow channel (415) and the positive electrode liquid outlet flow channel (416) are both arranged in an S shape. The negative electrode frame (45) further comprises a negative electrode liquid inlet flow channel (455), a negative electrode liquid outlet flow channel (456) and two negative electrode cover plates (457), the negative electrode liquid inlet flow channel (455) and the negative electrode liquid outlet flow channel (456) are both arranged in the negative electrode outer frame (451) and are both in communication with the negative electrode variable area (46), one of the negative electrode cover plates (457) is arranged on the negative electrode liquid inlet flow channel (455), the other negative electrode cover plate (457) is arranged on the negative electrode liquid outlet flow channel (456), and the negative electrode liquid inlet flow channel (455) and the negative electrode liquid outlet flow channel (456) are both arranged in an S shape.

7. The modular vanadium redox flow battery system of claim 6, wherein, The positive electrode frame (41) further comprises two positive electrode ball valves (417), the two positive electrode ball valves (417) are both mounted on the positive electrode outer frame (411), one of the positive electrode ball valves (417) is used for controlling the opening and closing of the positive electrode liquid inlet flow channel (415), and the other positive electrode ball valve (417) is used for controlling the opening and closing of the positive electrode liquid outlet flow channel (416). The negative electrode frame (45) further comprises two negative electrode ball valves (458), the two negative electrode ball valves (458) are both mounted on the negative electrode outer frame (451), one of the negative electrode ball valves (458) is used for controlling the opening and closing of the negative electrode liquid inlet flow channel (455), and the other negative electrode ball valve (458) is used for controlling the opening and closing of the negative electrode liquid outlet flow channel (456).

8. The modular vanadium redox flow battery system of claim 1, wherein, The ion exchange assembly (49) comprises an ion exchange membrane (491), a positive electrode gasket ring (492) and a negative electrode gasket ring (493), the ion exchange membrane (491) is located between the positive electrode frame (41) and the negative electrode frame (45), the positive electrode gasket ring (492) is sealingly mounted between the positive electrode frame (41) and the ion exchange membrane (491), and the negative electrode gasket ring (493) is sealingly mounted between the negative electrode frame (45) and the ion exchange membrane (491).

9. The modular vanadium redox flow battery system of claim 1, wherein, The positive electrode compression frame (1) comprises a positive electrode compression plate (11), a positive current collector (12), a positive electrode liquid inlet (13) and a positive electrode liquid outlet (14), the positive current collector (12) is mounted on the positive electrode compression plate (11), and the positive electrode liquid inlet (13) and the positive electrode liquid outlet (14) are both mounted on the positive electrode compression plate (11). The negative pressure frame (2) comprises a negative pressure plate (21), a negative current collector (22), a negative liquid inlet (23) and a negative liquid outlet (24), the negative current collector (22) is installed on the negative pressure plate (21), and the negative liquid inlet (23) and the negative liquid outlet (24) are both installed on the negative pressure plate (21).

10. The modular vanadium redox flow battery system of claim 1, wherein, The locking mechanism (5) comprises a locking screw (51), a positive locking nut (52), a negative locking nut (53), a positive spring (54) and a negative spring (55), the locking screw (51) is arranged in the positive pressure frame (1), the negative pressure frame (2) and a plurality of single batteries (4), the positive locking nut (52) is screwed on the locking screw (51) and located at one end of the locking screw (51) close to the positive pressure frame (1), the negative locking nut (53) is screwed on the locking screw (51) and located at one end of the locking screw (51) close to the negative pressure frame (2), the positive spring (54) is sleeved on the locking screw (51) and abuts between the positive locking nut (52) and the positive pressure frame (1), and the negative spring (55) is sleeved on the locking screw (51) and abuts between the negative locking nut (53) and the negative pressure frame (2).

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