Modularized all-vanadium redox flow battery system

Abstract

The invention provides a modularized all-vanadium redox flow battery system. The modularized all-vanadium redox flow battery system comprises a positive electrode pressing frame, a negative electrode pressing frame, a plurality of conductive plates, a plurality of single batteries and a plurality of locking mechanisms, and the plurality of conductive plates are positioned between the positive electrode pressing frame and the negative electrode pressing frame. A single battery is mounted between any two adjacent conductive plates; each single battery comprises a positive electrode frame, a plurality of positive electrode variable areas, a plurality of positive electrodes, a plurality of positive electrode adjusting assemblies, a negative electrode frame, a plurality of negative electrode variable areas, a plurality of negative electrodes, a plurality of negative electrode adjusting assemblies and an ion exchange assembly; the positive electrode adjusting assembly is configured to be capable of driving the two positive electrodes in the corresponding positive electrode variable area to move towards each other or move back to back in the first direction, and the negative electrode adjusting assembly is configured to be capable of driving the two negative electrodes in the corresponding negative electrode variable area to move towards each other or move back to back in the first direction. According to the modularized all-vanadium redox flow battery system provided by the invention, the reaction rate of the electrolyte at each part of the electrode is approximately kept consistent.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a modular all-vanadium liquid flow battery system. Background Art

[0002] All-vanadium liquid flow battery is a redox battery with vanadium as active material in a circulating liquid state. The electric energy of vanadium battery is stored in the form of chemical energy in sulfuric acid electrolyte of vanadium ions of different valence states. The electrolyte is pressed into the battery stack by an external pump. Under the action of mechanical power, it circulates in the closed loop of different liquid storage tanks and half-cells. Proton exchange membrane is used as the separator of the battery pack. The electrolyte solution flows parallel to the electrode surface and electrochemical reaction occurs. The current is collected and conducted through the double electrode plates, so that the chemical energy stored in the solution is converted into electrical energy.

[0003] A liquid flow battery is disclosed in a Chinese invention patent (application number: 200910078434.2), which solves the problem of low energy efficiency of liquid flow batteries by opening special electrolyte inlet and outlet branches and replacing flow guide nets, turbulent nets and other components with flow channels. However, in actual application, when the electrolyte flows on the electrode surface, the concentration of the reactant in the electrolyte will gradually decrease with the flow direction of the electrolyte, resulting in a large difference in the reaction rate at various locations of the electrode, which will affect various aspects of the performance of the all-vanadium liquid flow battery. Summary of the invention

[0004] The purpose of the embodiment of the present application is to provide a modular all-vanadium liquid flow battery system to solve the technical problem in the prior art that the concentration of the reactants in the electrolyte will gradually decrease with the flow direction of the electrolyte. To achieve the above purpose, the technical solution adopted by the present application is: to provide a modular all-vanadium liquid flow battery system, including: a positive electrode pressure frame; a negative electrode pressure frame; a plurality of conductive plates, and the plurality of conductive plates are located between the positive electrode pressure frame and the negative electrode pressure frame; a plurality of single cells, and the single cells are installed between any two adjacent conductive plates; the single cell includes a positive electrode frame, a plurality of positive electrode variable regions, a plurality of positive electrodes, a plurality of positive electrode adjustment components, a negative electrode frame, a plurality of negative electrode variable regions, a plurality of negative electrodes, a plurality of negative electrode adjustment components and an ion exchange component, and the plurality of positive electrode variable regions are all opened in the positive electrode frame and are interconnected, and each of the positive electrode variable regions is provided with two positive electrodes, and the plurality of positive electrode adjustment components are installed in the positive electrode frame and are arranged one by one with the plurality of positive electrode variable regions, and the positive electrode adjustment component is configured to be able to carry The two positive electrodes in the corresponding positive variable area move toward or away from each other along the first direction, a plurality of negative variable areas are opened in the negative frame and are interconnected, each negative variable area is provided with two negative electrodes, a plurality of negative regulating components are installed in the negative frame, and are arranged one by one with the plurality of negative variable areas, the negative regulating component is configured to be able to drive the two negative electrodes in the corresponding negative variable area to move toward or away from each other along the first direction, the ion exchange component is sealed and installed between the positive frame and the negative frame; a plurality of locking mechanisms, a plurality of the locking mechanisms are penetrated through the positive pressure frame, the negative pressure frame and the plurality of single batteries, and are configured to lock the positive pressure frame, the negative pressure frame, the plurality of conductive plates and the plurality of single batteries to each other.

[0005] Optionally, the positive electrode frame includes 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 all connected to 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 electrode variable region, and the plurality of first positive electrode hollow frames have a plurality of first positive electrode clamping blocks on the side facing the positive electrode variable region; the positive electrode includes a positive flexible electrode and a plurality of first positive electrode clamping grooves, the positive flexible electrode is provided with a plurality of first positive electrode clamping grooves on the 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-to-one with 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 all connected to 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 electrode 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 electrode variable area; the negative electrode comprises a negative flexible electrode and a plurality of first negative electrode clamping grooves, the negative flexible electrode is provided with a plurality of first negative electrode clamping grooves on one side facing the first negative electrode hollow frame, the plurality of first negative electrode clamping blocks are clamped in the plurality of first negative electrode clamping grooves, and are arranged one-to-one with the plurality of first negative electrode clamping grooves.

[0006] Optionally, the positive electrode adjustment assembly includes a positive electrode adjustment member, two second positive electrode hollow frames and a plurality of second positive electrode clamping blocks, the positive electrode adjustment member is installed on the positive electrode outer frame and is located between the two positive flexible electrodes, the two second positive electrode hollow frames are hinged to the positive electrode adjustment member, and are configured to move toward each other or move away from each other along a first direction under the drive of the positive electrode adjustment member, and the two second positive electrode hollow frames have a plurality of second positive electrode clamping blocks on the side facing the positive flexible electrode; the positive electrode also includes a plurality of second positive electrode clamping grooves, and a plurality of second positive electrode clamping grooves are provided on the side of the positive flexible electrode facing the second positive electrode hollow frame, and a plurality of second positive electrode clamping blocks are clamped in the plurality of second positive electrode clamping grooves, and are arranged one-to-one with the plurality of second positive electrode clamping grooves. The negative electrode regulating assembly comprises a negative electrode regulating member, two second negative electrode hollow frames and a plurality of second negative electrode clamping blocks, the negative electrode regulating member is mounted on the negative electrode outer frame and is located between the two negative flexible electrodes, the two second negative electrode hollow frames are hinged to the negative electrode regulating member, and are configured to move toward or away from each other along a first direction under the drive of the negative electrode regulating member, and the two second negative electrode hollow frames have a plurality of second negative electrode clamping blocks on one side facing the negative flexible electrode; the negative electrode also comprises a plurality of second negative electrode clamping grooves, a plurality of second negative electrode clamping grooves are provided on the side of the negative flexible electrode facing the second negative electrode hollow frame, a plurality of second negative electrode clamping blocks are clamped in the plurality of second negative electrode clamping grooves, and are arranged one-to-one with the plurality of second negative electrode clamping grooves.

[0007] Optionally, the positive electrode adjustment member includes a positive electrode adjustment rod, a first positive electrode hinged rod, a second positive electrode hinged rod, a positive electrode screw sleeve and a positive limit position frame, the positive electrode adjustment rod is penetrated by the positive electrode outer frame and can slide along the second direction, a plurality of the first positive electrode hinged rods are hinged between the positive electrode adjustment rod and one of the second positive electrode hollow frames, and are arranged at intervals, a plurality of the second positive electrode hinged rods are hinged between the positive electrode adjustment rod and another second positive electrode hollow frame, and are arranged at intervals, the positive electrode screw sleeve is sleeved on one end of the positive electrode adjustment rod and screwed to the positive electrode adjustment rod, and is configured to drive the positive electrode adjustment rod to slide along the second direction when rotating about the second direction, and the positive limit position frame is installed with the positive electrode outer frame, sleeved on the positive electrode adjustment rod, and is configured to limit the positive electrode screw sleeve The negative electrode adjusting member includes a negative electrode adjusting rod, a first negative electrode hinged rod, a second negative electrode hinged rod, a negative electrode screw sleeve and a negative limit position frame, the negative electrode adjusting rod is passed through the negative electrode outer frame and can slide along the second direction, a plurality of 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, a plurality of the second negative electrode hinged rods are hinged between the negative electrode adjusting rod and another 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 screwed on the negative electrode adjusting rod, and is configured to drive the negative electrode adjusting rod to slide along the second direction when rotating around the second direction, the negative limit position frame is installed with the negative electrode outer frame, sleeved on the negative electrode adjusting rod, and is configured to limit the negative electrode screw sleeve.

[0008] Optionally, the positive electrode also includes a plurality of positive electrode flow channels, and the plurality of positive electrode flow channels are all opened on the positive flexible electrode, and are extended along the first direction and spaced apart along the second direction, and the cross-sectional shape of the positive electrode flow channel perpendicular to the first direction is set to an arc or a trapezoid; the positive electrode frame also includes a plurality of first positive electrode avoidance grooves, and 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 in a one-to-one correspondence; the positive electrode adjustment component also includes a plurality of second positive electrode avoidance grooves, and 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 in a one-to-one correspondence. The negative electrode further comprises a plurality of negative electrode flow channels, which are all provided on the negative flexible electrode and extend along the first direction and are spaced apart along the second direction, and the cross-sectional shape of the negative electrode flow channel perpendicular to the first direction is set to an arc or a trapezoid; the negative electrode frame further comprises a plurality of first negative electrode avoidance grooves, and 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 in a one-to-one correspondence; the negative electrode regulating assembly further comprises a plurality of second negative electrode avoidance grooves, and 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 in a one-to-one correspondence.

[0009] Optionally, the positive electrode frame also includes a positive electrode liquid inlet channel, a positive electrode liquid outlet channel and two positive electrode cover plates, the positive electrode liquid inlet channel and the positive electrode liquid outlet channel are both opened in the positive electrode outer frame, and are both connected to the positive electrode variable area, one of the positive electrode cover plate sealing covers is arranged on the positive electrode liquid inlet channel, and the other positive electrode cover plate sealing cover is arranged on the positive electrode liquid outlet channel, and the positive electrode liquid inlet channel and the positive electrode liquid outlet channel are both arranged in an S shape; the negative electrode frame also includes a negative electrode liquid inlet channel, a negative electrode liquid outlet channel and two negative electrode cover plates, the negative electrode liquid inlet channel and the negative electrode liquid outlet channel are both opened in the negative electrode outer frame, and are both connected to the negative electrode variable area, one of the negative electrode cover plate sealing covers is arranged on the negative electrode liquid inlet channel, and the other negative electrode cover plate sealing cover is arranged on the negative electrode liquid outlet channel, and the negative electrode liquid inlet channel and the negative electrode liquid outlet channel are both arranged in an S shape.

[0010] Optionally, the positive electrode frame also includes two positive electrode ball valves, both of which are installed on the positive electrode outer frame, one of the positive electrode ball valves is used to control the on-off of the positive electrode liquid inlet channel, and the other positive electrode ball valve is used to control the on-off of the positive electrode liquid outlet channel; the negative electrode frame also includes two negative electrode ball valves, both of which are installed on the negative electrode outer frame, one of the negative electrode ball valves is used to control the on-off of the negative electrode liquid inlet channel, and the other negative electrode ball valve is used to control the on-off of the negative electrode liquid outlet channel.

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

[0012] Optionally, the positive electrode pressure frame includes a positive electrode pressure plate, a positive collector, a positive electrode liquid inlet and a positive electrode liquid outlet, the positive 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 includes a negative electrode pressure plate, a negative collector, a negative electrode liquid inlet and a negative electrode liquid outlet, the negative 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 includes a locking screw, a positive locking nut, a negative locking nut, a positive spring and a negative spring, the locking bolt is passed through the positive pressure frame, the negative pressure frame and the plurality of single cells, the positive locking nut is threadedly connected to the locking screw and is located at one end of the locking screw close to the positive pressure frame, the negative locking nut is threadedly connected to the locking screw and is located at one end of the locking screw close to the negative pressure frame, the positive spring is sleeved on the locking screw and is held between the positive locking nut and the positive pressure frame, and the negative spring is sleeved on the locking screw and is held between the negative locking nut and the negative pressure frame.

[0014] The beneficial effects of the modular all-vanadium liquid flow battery system provided in the present application are that when the device is used, the reaction rate of the electrolyte at various locations on the electrode can be kept roughly consistent, which can increase the uniformity of the electrode reaction, help improve the utilization rate of the electrode, and also help improve the charging and discharging performance and energy efficiency of the all-vanadium liquid flow battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A perspective view of a modular all-vanadium flow battery system provided for this application; Figure 2 A three-dimensional diagram of a single cell of a modular all-vanadium flow battery system provided for this application; Figure 3 An exploded diagram of a single cell of a modular all-vanadium flow battery system provided for this application; Figure 4 A first-perspective internal stereogram of the modular all-vanadium liquid flow battery system provided for this application; Figure 5 A second perspective internal stereogram of the modular all-vanadium liquid flow battery system provided for this application; Figure 6 for Figure 4 A partial enlarged view of the middle A; Figure 7 for Figure 5 A partial enlarged view of point B in the middle; Figure 8 for Figure 4 A partial enlarged view of point C in the middle; Fig. 9 for Figure 5 A partial enlarged view of point D in the middle; Fig.10 Exploded diagram of the ion exchange assembly of the modular all-vanadium liquid flow battery system provided for this application.

[0017] Among them, the reference numerals in the figure are: 1. Positive electrode pressing frame; 11. Positive electrode pressing plate; 12. Positive collector; 13. Positive electrode liquid inlet; 14. Positive electrode liquid outlet; 2. Negative electrode pressure frame; 21. Negative electrode pressure plate; 22. Negative collector; 23. Negative electrode liquid inlet; 24. Negative electrode liquid outlet; 3. Conductive plate; 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 avoidance groove; 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 groove; 433. Second positive electrode clamping groove; 43 4. positive electrode flow channel; 44. positive electrode adjustment assembly; 441. positive electrode adjustment member; 4411. positive electrode adjustment rod; 4412. first positive electrode hinge rod; 4413. second positive electrode hinge rod; 4414. positive electrode screw sleeve; 4415. positive limit position frame; 442. second positive electrode hollow frame; 443. second positive electrode clamping block; 444. second positive electrode avoidance groove; 45. negative electrode frame; 451. negative electrode outer frame; 452. first A negative electrode hollow frame; 453, a first negative electrode clamping block; 454, a first negative electrode avoidance groove; 455, a negative electrode liquid inlet flow channel; 456, a negative electrode liquid outlet flow channel; 457, a negative electrode cover plate; 458, a negative electrode ball valve; 46, a negative electrode variable area; 47, a negative electrode; 471, a negative flexible electrode; 472, a first negative electrode clamping groove; 473, a second negative electrode clamping groove; 474, a negative electrode flow channel; 48, a negative electrode adjustment component; 48 1. Negative electrode adjusting member; 4811. Negative electrode adjusting rod; 4812. First negative electrode hinged rod; 4813. Second negative electrode hinged rod; 4814. Negative electrode screw sleeve; 4815. Negative limit frame; 482. Second negative electrode hollow frame; 483. Second negative electrode clamping block; 484. Second negative electrode avoidance groove; 49. Ion exchange assembly; 491. Ion exchange membrane; 492. Positive electrode sealing gasket ring; 493. Negative electrode sealing gasket ring; 5. Locking mechanism; 51. Locking screw; 52. Positive pole locking nut; 53. Negative pole locking nut; 54. Positive pole spring; 55. Negative pole spring. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that when a component is referred to as being "mounted on", "fixed on" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. 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.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] like Figures 1 to 10 As shown, the present application provides a modular all-vanadium liquid flow battery system, including a positive electrode pressure frame 1, a negative electrode pressure frame 2, a plurality of conductive plates 3, a plurality of single cells 4 and a plurality of locking mechanisms 5. The plurality of conductive plates 3 are all located between the positive electrode pressure frame 1 and the negative electrode pressure frame 2. A single cell 4 is installed between any two adjacent conductive plates 3; the single cell 4 includes a positive electrode frame 41, a plurality of positive variable regions 42, a plurality of positive electrodes 43, a plurality of positive electrode adjustment components 44, a negative electrode frame 45, a plurality of negative electrode variable regions 46, a plurality of negative electrodes 47, a plurality of negative electrode adjustment components 48 and an ion exchange component 49, the plurality of positive electrode variable regions 42 are all opened in the positive electrode frame 41, and are interconnected, two positive electrodes 43 are arranged in each positive electrode variable region 42, the plurality of positive electrode adjustment components 44 are all installed in the positive electrode frame 41, and are arranged one by one with the plurality of positive electrode variable regions 42, and the positive electrode adjustment components 44 are configured In order to drive the two positive electrodes 43 in the corresponding positive variable region 42 to move toward or away from each other along the first direction, multiple negative variable regions 46 are all opened in the negative frame 45 and are interconnected. Two negative electrodes 47 are provided in each negative variable region 46. Multiple negative adjustment components 48 are installed in the negative frame 45 and are arranged one by one with the multiple negative variable regions 46. The negative adjustment components 48 are configured to drive the two negative electrodes 47 in the corresponding negative variable region 46 to move toward or away from each other along the first direction. The ion exchange component 49 is sealed and installed between the positive frame 41 and the negative frame 45. Multiple locking mechanisms 5 are provided through the positive pressure frame 1, the negative pressure frame 2 and the multiple single cells 4, and are configured to lock the positive pressure frame 1, the negative pressure frame 2, the multiple conductive plates 3 and the multiple single cells 4 with each other.

[0023] It should be noted that, in this embodiment, the number of single cells 4 is N, and the number of conductive plates 3 is N+1. It should also be noted that, in this embodiment, the number of positive variable regions 42 and the number of negative variable regions 46 are both set to two for illustration. Of course, in other embodiments, the positive variable regions 42 and the negative variable regions 46 can also be set to three, four, five, etc., and other numbers are not limited here.

[0024] The modular all-vanadium liquid flow battery system provided in the present application, when using the device, the staff can stretch or squeeze the two positive electrodes 43 in the positive variable region 42 through the positive electrode adjustment component 44; the staff can stretch or squeeze the two negative electrodes 47 in the negative variable region 46 through the negative electrode adjustment component 48. According to the flow direction of the electrode liquid, the staff can gradually increase the specific surface area of ​​the multiple positive electrodes 43, and can also gradually increase the specific surface area of ​​the multiple negative electrodes 47, so that the reaction rate of the electrolyte at various locations of the electrode can be roughly consistent, which can increase the uniformity of the electrode reaction, help improve the utilization rate of the electrode, and also help improve the charging and discharging performance and energy efficiency of the all-vanadium liquid flow battery.

[0025] Optionally, the single cell 4 further includes 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 .

[0026] In one embodiment of the present application, see Figures 1 to 10The positive electrode frame 41 includes a positive electrode outer frame 411, a plurality of first positive electrode hollow frames 412 and a plurality of first positive electrode clamping blocks 413. The plurality of first positive electrode hollow frames 412 are all connected to the positive electrode outer frame 411 and are arranged at intervals. Any two adjacent first positive electrode hollow frames 412 and the positive electrode outer frame 411 enclose a positive electrode variable region 42. The plurality of first positive electrode hollow frames 412 have a plurality of first positive electrode clamping blocks 413 on one side facing the positive electrode variable region 42. The positive electrode 43 includes a positive flexible electrode 431 and a plurality of first positive electrode clamping grooves 432. The positive flexible electrode 431 has a plurality of first positive electrode clamping grooves 432 on one side facing the first positive electrode hollow frame 412. 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-to-one with the plurality of first positive electrode clamping grooves 432. The negative electrode frame 45 includes a negative electrode outer frame 451, a plurality of first negative electrode hollow frames 452 and a plurality of first negative electrode clamping blocks 453. The plurality of first negative electrode hollow frames 452 are all connected to the negative electrode outer frame 451 and are arranged at intervals. Any two adjacent first negative electrode hollow frames 452 and the negative electrode outer frame 451 enclose a negative electrode variable region 46. The plurality of first negative electrode hollow frames 452 have a plurality of first negative electrode clamping blocks 453 on one side facing the negative electrode variable region 46. The negative electrode 47 includes a negative flexible electrode 471 and a plurality of first negative electrode clamping grooves 472. The negative flexible electrode 471 has a plurality of first negative electrode clamping grooves 472 on one side facing the first negative electrode hollow frame 452. 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-to-one with the plurality of first negative electrode clamping grooves 472.

[0027] With such a configuration, when the positive electrode adjustment component 44 is used, the positive flexible electrode 431 can be connected to the first positive electrode hollow frame 412 by 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 along the first direction, so that the positive electrode adjustment component 44 can normally stretch or squeeze the positive flexible electrode 431. When the negative electrode adjustment component 48 is used, the negative flexible electrode 471 can be connected to the first negative electrode hollow frame 452 by 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 along the first direction, so that the negative electrode adjustment component 48 can normally stretch or squeeze 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, so as to prevent the electrolyte from 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, so as to prevent the electrolyte from flowing through the negative flexible electrode 471.

[0028] In one embodiment of the present application, please refer to Figures 1 to 10The positive electrode adjustment assembly 44 includes a positive electrode adjustment member 441, two second positive electrode hollow frames 442 and a plurality of second positive electrode clamping blocks 443. The positive electrode adjustment member 441 is installed on the positive electrode outer frame 411 and is located between the two positive flexible electrodes 431. The two second positive electrode hollow frames 442 are hinged to the positive electrode adjustment member 441 and are configured to move toward each other or move away from each other along the first direction under the drive of the positive electrode adjustment member 441. The two second positive electrode hollow frames 442 have a plurality of second positive electrode clamping blocks 443 on one side facing the positive flexible electrode 431. The positive electrode 43 also includes a plurality of second positive electrode clamping grooves 433. A plurality of second positive electrode clamping grooves 433 are provided on one side of the positive flexible electrode 431 facing the second positive electrode hollow frame 442. The plurality of second positive electrode clamping blocks 443 are clamped in the plurality of second positive electrode clamping grooves 433 and are arranged one-to-one with the plurality of second positive electrode clamping grooves 433. The negative electrode regulating assembly 48 includes a negative electrode regulating member 481, two second negative electrode hollow frames 482 and a plurality of second negative electrode clamping blocks 483. The negative electrode regulating member 481 is installed on the negative electrode outer frame 451 and is located between the two negative flexible electrodes 471. The two second negative electrode hollow frames 482 are hinged to the negative electrode regulating member 481 and are configured to move toward each other or move away from each other along the first direction under the drive of the negative electrode regulating member 481. The two second negative electrode hollow frames 482 have a plurality of second negative electrode clamping blocks 483 on one side facing the negative flexible electrode 471. The negative electrode 47 also includes a plurality of second negative electrode clamping grooves 473. A plurality of second negative electrode clamping grooves 473 are provided on one side of the negative flexible electrode 471 facing the second negative electrode hollow frame 482. The plurality of second negative electrode clamping blocks 483 are clamped in the plurality of second negative electrode clamping grooves 473 and are arranged one-to-one with the plurality of second negative electrode clamping grooves 473.

[0029] With such a configuration, when the positive electrode adjustment component 44 is used, the positive flexible electrode 431 can be connected to the second positive electrode hollow frame 442 by 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. The second positive electrode hollow frame 442 can limit the positive flexible electrode 431 along the first direction, so that the positive electrode adjustment component 44 can normally stretch or squeeze the positive flexible electrode 431. When the negative electrode adjustment component 48 is used, the negative flexible electrode 471 can be connected to the second negative electrode hollow frame 482 by 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. The second negative electrode hollow frame 482 can limit the negative flexible electrode 471 along the first direction, so that the negative electrode adjustment component 48 can normally stretch or squeeze the negative flexible electrode 471. When adjusting the specific surface area of ​​the positive electrode 43, the positive electrode adjusting member 441 can be used to drive the two second positive electrode hollow frames 442 to move toward or away from each other along the first direction, and the cooperation of the second positive electrode clamping block 443 and the second positive electrode clamping groove 433 can make the two positive electrodes 43 stretched or squeezed, so that the specific surface area of ​​the positive electrode 43 can be adjusted, and the adjustment is convenient. When adjusting the specific surface area of ​​the negative electrode 47, the negative electrode adjusting member 481 can be used to drive the two second negative electrode hollow frames 482 to move toward or away from each other along the first direction, and the cooperation of the second negative electrode clamping block 483 and the second negative electrode clamping groove 473 can make the two negative electrodes 47 stretched or squeezed, so that the specific surface area of ​​the negative electrode 47 can be adjusted, and the adjustment is convenient.

[0030] In one embodiment of the present application, see Figures 1 to 10The positive electrode adjusting member 441 includes a positive electrode adjusting rod 4411, a first positive electrode hinged rod 4412, a second positive electrode hinged rod 4413, a positive electrode screw sleeve 4414 and a positive limit position frame 4415. The positive electrode adjusting rod 4411 is inserted into the positive electrode outer frame 411 and can slide along 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 They are both hinged between the positive electrode adjustment rod 4411 and another 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 adjustment rod 4411 and is screwed to the positive electrode adjustment rod 4411, and is configured to drive the positive electrode adjustment rod 4411 to slide along the second direction when rotating around the second direction. The positive limit position frame 4415 is installed on the positive electrode outer frame 411, and is sleeved on the positive electrode adjustment rod 4411, and is configured to limit the positive electrode screw sleeve 4414. The negative electrode adjusting member 481 includes 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 limit frame 4815. The negative electrode adjusting rod 4811 is inserted into the negative electrode outer frame 451 and can slide along 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 It is hinged between the negative pole adjusting rod 4811 and another second negative pole hollow frame 482, and is arranged at intervals. The negative pole screw sleeve 4814 is sleeved on one end of the negative pole adjusting rod 4811 and is screwed to the negative pole adjusting rod 4811, and is configured to drive the negative pole adjusting rod 4811 to slide along the second direction when rotating around the second direction. The negative limit frame 4815 is installed on the negative pole outer frame 451, and is sleeved on the negative pole adjusting rod 4811, and is configured to limit the negative pole screw sleeve 4814.

[0031] With such arrangement, when adjusting the specific surface area of ​​the positive electrode 43, the staff can rotate the positive electrode screw sleeve 4414 to make the first positive electrode hinge rod 4412 and the second positive electrode hinge rod 4413 rotate toward or away from each other, thereby driving the two positive electrodes 43 to move toward or away from each other along the first direction, thereby stretching or squeezing the two positive electrodes 43, and making the adjustment convenient. When adjusting the specific surface area of ​​the negative electrode 47, the staff can rotate the negative electrode screw sleeve 4814 to make the first negative electrode hinge rod 4812 and the second negative electrode hinge rod 4813 rotate toward or away from each other, thereby driving the two negative electrodes 47 to move toward or away from each other along the first direction, thereby stretching or squeezing the two negative electrodes 47, and making the adjustment convenient. The positive limit bracket 4415 can limit the positive electrode screw sleeve 4414 so that the positive electrode screw sleeve 4414 can only rotate in the second direction, which helps to improve the structural stability between the positive electrode screw sleeve 4414 and the positive electrode outer frame 411, and facilitates the positive electrode screw sleeve 4414 to drive the positive electrode adjustment rod 4411 to move in the second direction. The negative limit bracket 4815 can limit the negative electrode screw sleeve 4814 so that the negative electrode screw sleeve 4814 can only rotate in the second direction, which helps to improve the structural stability between the negative electrode screw sleeve 4814 and the negative electrode outer frame 451, and facilitates the negative electrode screw sleeve 4814 to drive the negative electrode adjustment rod 4811 to move in the second direction.

[0032] In one embodiment of the present application, see Figures 1 to 10, the positive electrode 43 also includes a plurality of positive electrode channels 434, which are all provided on the positive flexible electrode 431, and are extended along the first direction, and are arranged at intervals along the second direction, and the cross-sectional shape of the positive electrode channel 434 perpendicular to the first direction is set to an arc or a trapezoid. The positive electrode frame 41 also includes a plurality of first positive electrode avoidance grooves 414, each first positive electrode hollow frame 412 is provided with a plurality of first positive electrode avoidance grooves 414, and the plurality of first positive electrode avoidance grooves 414 on each first positive electrode hollow frame 412 and the plurality of positive electrode channels 434 are arranged one by one. The positive electrode adjustment component 44 also includes a plurality of second positive electrode avoidance grooves 444, each second positive electrode hollow frame 442 is provided with a plurality of second positive electrode avoidance grooves 444, and the plurality of second positive electrode avoidance grooves 444 on each second positive electrode hollow frame 442 and the plurality of positive electrode channels 434 are arranged one by one. The negative electrode 47 also includes a plurality of negative electrode channels 474, which are all provided on the negative flexible electrode 471 and are extended along the first direction and spaced apart along the second direction. The cross-sectional shape of the negative electrode channel 474 perpendicular to the first direction is set to an arc or a trapezoid. The negative electrode frame 45 also includes a plurality of first negative electrode avoidance grooves 454, each first negative electrode hollow frame 452 is provided with a plurality of first negative electrode avoidance grooves 454, and the plurality of first negative electrode avoidance grooves 454 and the plurality of negative electrode channels 474 on each first negative electrode hollow frame 452 are arranged in a one-to-one correspondence. The negative electrode regulating assembly 48 also includes a plurality of second negative electrode avoidance grooves 484, each second negative electrode hollow frame 482 is provided with a plurality of second negative electrode avoidance grooves 484, and the plurality of second negative electrode avoidance grooves 484 and the plurality of negative electrode channels 474 on each second negative electrode hollow frame 482 are arranged in a one-to-one correspondence.

[0033] In this way, by opening a plurality of positive electrode channels 434 on the surface of the positive electrode 43, the electrolyte can be guided to be evenly distributed on the surface of the positive flexible electrode 431, and it is convenient for the electrolyte to take away the heat generated by the reaction, which is convenient for heat dissipation. Since the cross-sectional shape of the positive electrode channel 434 perpendicular to the first direction is set to an arc or a trapezoid, when the positive flexible electrode 431 is squeezed, it is possible to avoid the positive electrode channel 434 being completely blocked due to squeezing of the positive flexible electrode 431, and ensure that the electrolyte can flow normally on the surface of the positive flexible electrode 431. During use, the electrolyte can be avoided by the first positive electrode avoidance groove 414 and the second positive electrode avoidance groove 444, so that the electrolyte can flow normally through the positive electrode channel 434, avoiding the first positive electrode hollow frame 412 and the second positive electrode hollow frame 442 from interfering with the flow of the electrolyte. By opening a plurality of negative electrode channels 474 on the surface of the negative electrode 47, the electrolyte can be guided to be evenly distributed on the surface of the negative flexible electrode 471, and it is convenient for the electrolyte to take away the heat generated by the reaction, which is convenient for heat dissipation. Since the cross-sectional shape of the negative electrode flow channel 474 perpendicular to the first direction is set to an arc or a trapezoid, when the negative flexible electrode 471 is squeezed, it can prevent the negative flexible electrode 471 from being completely blocked due to squeezing, and ensure that the electrolyte can flow normally on the surface of the negative flexible electrode 471. During use, the electrolyte can be avoided by the first negative electrode avoidance groove 454 and the second negative electrode avoidance groove 484, so that the electrolyte can flow normally through the negative electrode flow channel 474, and the first negative electrode hollow frame 452 and the second negative electrode hollow frame 482 are prevented from interfering with the flow of the electrolyte.

[0034] In one embodiment of the present application, please refer to Figures 1 to 10 The positive electrode frame 41 also includes a positive electrode liquid inlet channel 415, a positive electrode liquid outlet channel 416 and two positive electrode covers (not shown in the figure). The positive electrode liquid inlet channel 415 and the positive electrode liquid outlet channel 416 are both opened in the positive electrode outer frame 411, and are both connected to the positive electrode variable area 42. One of the positive electrode cover plate sealing covers is arranged on the positive electrode liquid inlet channel 415, and the other positive electrode cover plate sealing cover is arranged on the positive electrode liquid outlet channel 416. The positive electrode liquid inlet channel 415 and the positive electrode liquid outlet channel 416 are both arranged in an S shape. The negative electrode frame 45 also includes a negative electrode liquid inlet channel 455, a negative electrode liquid outlet channel 456 and two negative electrode covers 457. The negative electrode liquid inlet channel 455 and the negative electrode liquid outlet channel 456 are both opened in the negative electrode outer frame 451, and are both connected to the negative electrode variable area 46. One of the negative electrode covers 457 is sealed on the negative electrode liquid inlet channel 455, and the other negative electrode cover 457 is sealed on the negative electrode liquid outlet channel 456. The negative electrode liquid inlet channel 455 and the negative electrode liquid outlet channel 456 are both arranged in an S shape.

[0035] With such arrangement, 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 fully react in the positive electrode frame 41, greatly improving the energy efficiency of the all-vanadium liquid flow battery. Through the two positive electrode covers, 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 fully react in the negative electrode frame 45, greatly improving the energy efficiency of the all-vanadium liquid flow battery. The two negative electrode covers 457 can seal the negative electrode liquid inlet channel 455 and the negative electrode liquid outlet channel 456 to prevent the electrolyte from overflowing from the negative electrode liquid inlet channel 455 and the negative electrode liquid outlet channel 456, and the sealing effect is good.

[0036] In one embodiment of the present application, see Figures 1 to 10 The positive electrode frame 41 also includes 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 inlet flow channel 415, and the other positive electrode ball valve 417 is used to control the on-off of the positive electrode outlet flow channel 416. The negative electrode frame 45 also includes 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 inlet flow channel 455, and the other negative electrode ball valve 458 is used to control the on-off of the negative electrode outlet flow channel 456.

[0037] With such arrangement, when a single cell 4 fails, the two positive ball valves 417 and the two negative ball valves 458 can isolate the failed single cell 4 from the multiple single cells 4, preventing the electrolyte from entering the failed single cell 4. Compared with the related art, the all-vanadium liquid flow battery can be prevented from being affected during use.

[0038] In one embodiment of the present application, see Figures 1 to 10 The ion exchange assembly 49 includes an ion exchange membrane 491, a positive electrode sealing gasket ring 492 and a negative electrode sealing 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 sealing gasket ring 492 is sealed and installed between the positive electrode frame 41 and the ion exchange membrane 491. The negative electrode sealing gasket ring 493 is sealed and installed between the negative electrode frame 45 and the ion exchange membrane 491.

[0039] With such arrangement, the positive electrode sealing ring 492 can prevent the electrolyte from leaking between the ion exchange membrane 491 and the positive electrode outer frame 411, and the sealing effect is good. The negative electrode sealing ring 493 can prevent the electrolyte from leaking between the ion exchange membrane 491 and the negative electrode outer frame 451, and the sealing effect is good.

[0040] In one embodiment of the present application, please refer to Figures 1 to 10 The positive electrode pressing frame 1 includes a positive electrode pressing plate 11, a positive collector 12, a positive electrode liquid inlet 13 and a positive electrode liquid outlet 14. The positive collector 12 is mounted on the positive electrode pressing plate 11, and the positive electrode liquid inlet 13 and the positive electrode liquid outlet 14 are both mounted on the positive electrode pressing plate 11. The negative electrode pressing frame 2 includes a negative electrode pressing plate 21, a negative collector 22, a negative electrode liquid inlet 23 and a negative electrode liquid outlet 24. The negative collector 22 is mounted on the negative electrode pressing plate 21, and the negative electrode liquid inlet 23 and the negative electrode liquid outlet 24 are both mounted on the negative electrode pressing plate 21.

[0041] With such arrangement, electrolyte can be input into the plurality of positive electrode inlet channels 415 through the positive electrode inlet port 13. Through the positive electrode outlet port 14, the plurality of positive electrode outlet channels 416 can output the electrolyte to the positive electrode outlet port 14, so as to realize circulation transportation. Through the negative electrode inlet port 23, electrolyte can be input into the plurality of negative electrode inlet channels 455. Through the negative electrode outlet port 24, the plurality of negative electrode outlet channels 456 can output the electrolyte to the negative electrode outlet port 24, so as to realize circulation transportation.

[0042] In one embodiment of the present application, see 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 bolts are passed through the positive pressure frame 1, the negative pressure frame 2 and multiple single batteries 4. The positive locking nut 52 is screwed on the locking screw 51 and is located at the 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 is located at the 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 is abutted between the positive locking nut 52 and the positive pressure frame 1. The negative spring 55 is sleeved on the locking screw 51 and is abutted between the negative locking nut 53 and the negative pressure frame 2.

[0043] With such arrangement, under the joint action of the locking screw 51, the positive locking nut 52 and the negative locking nut 53, the positive pressing frame 1, the negative pressing frame 2 and the plurality of cells 4 can be locked, and the locking effect is good. In addition, a prestress can be applied to the positive pressing frame 1 and the negative pressing frame 2 through the positive spring 54 and the negative spring 55, which helps to further improve the locking effect of the locking mechanism 5.

[0044] The working principle of the modular all-vanadium liquid flow battery system provided in the present application is as follows: First, it should be noted that the first direction above and below refers to the bidirectional direction of the shortest connection line between the positive electrodes 43, as shown in FIG. 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, as shown in FIG. Figure 4 The positive electrode electrolyte is input from the positive electrode inlet 13 and transported to the multiple positive electrode inlet channels 415 through the positive electrode inlet 13. After entering the positive electrode inlet channel 415, the positive electrode electrolyte flows through the multiple positive electrode variable regions 42, then flows into the positive electrode outlet channel 416, and finally outputs from the positive electrode outlet channel 416 to the positive electrode outlet 14. The negative electrode electrolyte is input from the negative electrode inlet 23 and transported to the multiple negative electrode inlet channels 455 through the negative electrode inlet 23. After entering the negative electrode inlet channel 455, the negative electrode electrolyte flows through the multiple negative electrode variable regions 46, then flows into the negative electrode outlet channel 456, and finally outputs from the negative electrode outlet channel 456 to the negative electrode outlet 24. The staff rotates the positive electrode screw sleeve 4414 near the positive electrode liquid inlet channel 415 to make the positive electrode adjustment rod 4411 move along the second direction, and the positive electrode adjustment rod 4411 drives the first positive electrode hinge rod 4412 and the second positive electrode hinge rod 4413 to rotate in opposite directions, so that the two second positive electrode hollow frames 442 near the positive electrode liquid inlet channel 415 can move in opposite directions along the first direction, and then the two positive flexible electrodes 431 near the positive electrode liquid inlet channel 415 can be squeezed, and the specific surface area of ​​the two positive flexible electrodes near the positive electrode liquid inlet channel 415 is reduced. The staff rotates the positive electrode screw sleeve 4414 near the positive electrode liquid outlet flow channel 416 to move the positive electrode adjustment rod 4411 in the second direction, and the positive electrode adjustment rod 4411 drives the first positive electrode hinge rod 4412 and the second positive electrode hinge rod 4413 to rotate toward each other, so that the two second positive electrode hollow frames 442 near the positive electrode liquid outlet flow channel 416 can move toward each other in the first direction, and then the two positive flexible electrodes 431 near the positive electrode liquid inlet flow channel 415 can be stretched, and the specific surface area of ​​the two positive flexible electrodes 431 near the positive electrode liquid outlet flow channel 416 is increased. The negative flexible electrode 471 is adjusted in the same way.

[0045] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A modular all-vanadium liquid flow battery system, characterized in that: include: Positive electrode pressing frame (1); Negative electrode pressure frame (2); A plurality of conductive plates (3), wherein the plurality of conductive plates (3) are all located between the positive electrode pressure frame (1) and the negative electrode pressure frame (2); A plurality of single cells (4), wherein the single cells (4) are installed between any two adjacent conductive plates (3); the single cells (4) comprise a positive electrode frame (41), a plurality of positive electrode variable regions (42), a plurality of positive electrodes (43), a plurality of positive electrode regulating components (44), a negative electrode frame (45), a plurality of negative electrode variable regions (46), a plurality of negative electrodes (47), a plurality of negative electrode regulating components (48) and an ion exchange component (49); the plurality of positive electrode variable regions (42) are all arranged in the positive electrode frame (41) and are interconnected; each of the positive electrode variable regions (42) is provided with two positive electrodes (43); the plurality of positive electrode regulating components (44) are all installed in the positive electrode frame (41) and are arranged one-to-one with the plurality of positive electrode variable regions (42); the positive electrode regulating components (45) are arranged one-to-one with the plurality of positive electrode variable regions (42); 4) configured to be able to drive the two positive electrodes (43) in the corresponding positive variable region (42) to move toward or away from each other along a first direction, a plurality of negative variable regions (46) are all opened in the negative electrode frame (45) and are interconnected, each of the negative variable regions (46) is provided with two negative electrodes (47), a plurality of negative electrode adjustment components (48) are all installed in the negative electrode frame (45) and are arranged one-to-one with the plurality of negative variable regions (46), the negative electrode adjustment components (48) are configured to be able to drive the two negative electrodes (47) in the corresponding negative variable region (46) to move toward or away from each other along the first direction, and the ion exchange component (49) is sealed and installed between the positive electrode frame (41) and the negative electrode frame (45); A plurality of locking mechanisms (5), wherein the plurality of locking mechanisms (5) are disposed through the positive electrode pressure frame (1), the negative electrode pressure frame (2), and the plurality of single cells (4), and are configured to lock the positive electrode pressure frame (1), the negative electrode pressure frame (2), the plurality of conductive plates (3), and the plurality of single cells (4) to each other.

2. The modular all-vanadium liquid flow battery system according to claim 1, characterized in that: The positive electrode frame (41) comprises a positive electrode outer frame (411), a plurality of first positive electrode hollow frames (412) and a plurality of first positive electrode clamping blocks (413); the plurality of first positive electrode hollow frames (412) are all connected to the positive electrode outer frame (411) and are arranged at intervals; any two adjacent first positive electrode hollow frames (412) and the positive electrode outer frame (411) enclose the positive electrode variable region (42); and the plurality of first positive electrode hollow frames (412) are provided with a plurality of first positive electrode clamping blocks (413) on one side facing the positive electrode variable region (42); The positive electrode (43) comprises a positive flexible electrode (431) and a plurality of first positive electrode clamping grooves (432); the positive flexible electrode (431) is provided with a plurality of first positive electrode clamping grooves (432) on one side facing the first positive electrode hollow frame (412); a plurality of first positive electrode clamping blocks (413) are clamped in the plurality of first positive electrode clamping grooves (432), and are arranged in a one-to-one correspondence with the plurality of first positive electrode clamping grooves (432); The negative electrode frame (45) comprises a negative electrode outer frame (451), a plurality of first negative electrode hollow frames (452) and a plurality of first negative electrode clamping blocks (453); the plurality of first negative electrode hollow frames (452) are all connected to the negative electrode outer frame (451) and are arranged at intervals; any two adjacent first negative electrode hollow frames (452) and the negative electrode outer frame (451) enclose the negative electrode variable region (46); and the plurality of first negative electrode hollow frames (452) are provided with a plurality of first negative electrode clamping blocks (453) on one side facing the negative electrode variable region (46); The negative electrode (47) comprises a negative flexible electrode (471) and a plurality of first negative electrode clamping grooves (472); the negative flexible electrode (471) is provided with a plurality of first negative electrode clamping grooves (472) on one side facing the first negative electrode hollow frame (452); a plurality of first negative electrode clamping blocks (453) are clamped in the plurality of first negative electrode clamping grooves (472) and are arranged in a one-to-one correspondence with the plurality of first negative electrode clamping grooves (472).

3. The modular all-vanadium liquid flow battery system according to claim 2, characterized in that: The positive electrode adjustment component (44) comprises a positive electrode adjustment member (441), two second positive electrode hollow frames (442) and a plurality of second positive electrode clamping blocks (443); the positive electrode adjustment member (441) is mounted on the positive electrode outer frame (411) and is located between the two positive flexible electrodes (431); the two second positive electrode hollow frames (442) are hinged to the positive electrode adjustment member (441) and are configured to move towards or away from each other along a first direction under the drive of the positive electrode adjustment member (441); and the two second positive electrode hollow frames (442) each have a plurality of second positive electrode clamping blocks (443) on one side facing the positive flexible electrode (431); The positive electrode (43) further comprises a plurality of second positive electrode clamping grooves (433); a plurality of second positive electrode clamping grooves (433) are provided on a side of the positive flexible electrode (431) facing the second positive electrode hollow frame (442); a plurality of second positive electrode clamping blocks (443) are clamped in the plurality of second positive electrode clamping grooves (433), and are arranged in a one-to-one correspondence with the plurality of second positive electrode clamping grooves (433); The negative electrode adjustment component (48) comprises a negative electrode adjustment member (481), two second negative electrode hollow frames (482) and a plurality of second negative electrode clamping blocks (483); the negative electrode adjustment member (481) is mounted on the negative electrode outer frame (451) and is located between the two negative flexible electrodes (471); the two second negative electrode hollow frames (482) are hinged to the negative electrode adjustment member (481) and are configured to move toward or away from each other along a first direction under the drive of the negative electrode adjustment member (481); and the two second negative electrode hollow frames (482) each have a plurality of second negative electrode clamping blocks (483) on one side facing the negative flexible electrode (471); The negative electrode (47) further comprises a plurality of second negative electrode clamping grooves (473); a plurality of second negative electrode clamping grooves (473) are provided on a side of the negative flexible electrode (471) facing the second negative electrode hollow frame (482); a plurality of second negative electrode clamping blocks (483) are clamped in the plurality of second negative electrode clamping grooves (473), and are arranged in a one-to-one correspondence with the plurality of second negative electrode clamping grooves (473).

4. The modular all-vanadium liquid flow battery system according to claim 3, characterized in that: The positive electrode adjusting member (441) comprises a positive electrode adjusting rod (4411), a first positive electrode hinged rod (4412), a second positive electrode hinged rod (4413), a positive electrode screw sleeve (4414) and a positive limit position frame (4415); the positive electrode adjusting rod (4411) is inserted into the positive electrode outer frame (411) and is capable of sliding along a second direction; a plurality of the 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; a plurality of the second positive electrode hinged rods (4413) are hinged connected between the positive electrode adjustment rod (4411) and another of the second positive electrode hollow frames (442), and arranged at intervals; the positive electrode screw sleeve (4414) is sleeved on one end of the positive electrode adjustment rod (4411), and is screwed to the positive electrode adjustment rod (4411), and is configured to drive the positive electrode adjustment rod (4411) to slide along the second direction when rotating around the second direction; the positive limit frame (4415) is installed with the positive electrode outer frame (411), and is sleeved on the positive electrode adjustment rod (4411), and is configured to limit the positive electrode screw sleeve (4414); The negative electrode adjustment member (481) comprises a negative electrode adjustment 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 limit frame (4815); the negative electrode adjustment rod (4811) is inserted into the negative electrode outer frame (451) and is capable of sliding along a second direction; a plurality of the first negative electrode hinged rods (4812) are hinged between the negative electrode adjustment rod (4811) and one of the second negative electrode hollow frames (482) and are arranged at intervals; a plurality of the second negative electrode hinged rods (4813) are hinged The negative electrode screw sleeve (4814) is connected between the negative electrode adjustment rod (4811) and another second negative electrode hollow frame (482) and is arranged at intervals. The negative electrode screw sleeve (4814) is sleeved on one end of the negative electrode adjustment rod (4811) and is screwed to the negative electrode adjustment rod (4811), and is configured to drive the negative electrode adjustment rod (4811) to slide along the second direction when rotating around the second direction. The negative limit frame (4815) is installed on the negative electrode outer frame (451), sleeved on the negative electrode adjustment rod (4811), and is configured to limit the negative electrode screw sleeve (4814).

5. The modular all-vanadium liquid flow battery system according to claim 2, characterized in that: The positive electrode (43) further comprises a plurality of positive electrode flow channels (434), the plurality of positive electrode flow channels (434) are all opened on the positive flexible electrode (431), and are extended along the first direction and arranged at intervals along the second direction, and the cross-sectional shape of the positive electrode flow channels (434) perpendicular to the first direction is arranged to be an arc or a trapezoid; The positive electrode frame (41) further comprises a plurality of first positive electrode avoidance grooves (414), each of the first positive electrode hollow frames (412) is provided with a plurality of the first positive electrode avoidance grooves (414), and the plurality of the first positive electrode avoidance grooves (414) and the plurality of the positive electrode flow channels (434) on each of the first positive electrode hollow frames (412) are arranged in a one-to-one correspondence; The positive electrode regulating component (44) further comprises a plurality of second positive electrode avoidance grooves (444), each of the second positive electrode hollow frames (442) is provided with a plurality of second positive electrode avoidance grooves (444), and the plurality of second positive electrode avoidance grooves (444) and the plurality of positive electrode flow channels (434) on each of the second positive electrode hollow frames (442) are arranged in a one-to-one correspondence; The negative electrode (47) further comprises a plurality of negative electrode flow channels (474), the plurality of negative electrode flow channels (474) are all opened on the negative flexible electrode (471), and are extended along the first direction and arranged at intervals along the second direction, and the cross-sectional shape of the negative electrode flow channels (474) perpendicular to the first direction is arranged to be an arc or a trapezoid; The negative electrode frame (45) further comprises a plurality of first negative electrode avoidance grooves (454), each of the first negative electrode hollow frames (452) is provided with a plurality of the first negative electrode avoidance grooves (454), and the plurality of the first negative electrode avoidance grooves (454) and the plurality of the negative electrode flow channels (474) on each of the first negative electrode hollow frames (452) are arranged in one-to-one correspondence; The negative electrode regulating component (48) further comprises a plurality of second negative electrode avoidance grooves (484), each of the second negative electrode hollow frames (482) is provided with a plurality of second negative electrode avoidance grooves (484), and the plurality of second negative electrode avoidance grooves (484) and the plurality of negative electrode flow channels (474) on each of the second negative electrode hollow frames (482) are arranged in one-to-one correspondence.

6. The modular all-vanadium liquid flow battery system according to claim 2, characterized in that: 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, wherein 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 connected to the positive electrode variable region (42), wherein one of the positive electrode cover plate sealing covers is arranged on the positive electrode liquid inlet flow channel (415), and the other positive electrode cover plate sealing cover 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 opened in the negative electrode outer frame (451) and are both connected to the negative electrode variable region (46); one of the negative electrode cover plates (457) is sealed and disposed on the negative electrode liquid inlet flow channel (455); the other negative electrode cover plate (457) is sealed and disposed on the negative electrode liquid outlet flow channel (456); 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 all-vanadium liquid flow battery system according to claim 6, characterized in that: The positive electrode frame (41) further comprises two positive electrode ball valves (417), both of which are mounted on the positive electrode outer frame (411), wherein one of the positive electrode ball valves (417) is used to control the on-off of the positive electrode liquid inlet flow channel (415), and the other positive electrode ball valve (417) 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 mounted on the negative electrode outer frame (451), wherein one of the negative electrode ball valves (458) is used to control the on / off of the negative electrode liquid inlet flow channel (455), and the other negative electrode ball valve (458) is used to control the on / off of the negative electrode liquid outlet flow channel (456).

8. The modular all-vanadium liquid flow battery system according to claim 1, characterized in that: The ion exchange assembly (49) comprises an ion exchange membrane (491), a positive electrode sealing gasket ring (492) and a negative electrode sealing 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 sealing gasket ring (492) is sealingly installed between the positive electrode frame (41) and the ion exchange membrane (491); and the negative electrode sealing gasket ring (493) is sealingly installed between the negative electrode frame (45) and the ion exchange membrane (491).

9. The modular all-vanadium liquid flow battery system according to claim 1, characterized in that: The positive electrode pressing frame (1) comprises a positive electrode pressing plate (11), a positive collector (12), a positive electrode liquid inlet (13) and a positive electrode liquid outlet (14); the positive collector (12) is mounted on the positive electrode pressing plate (11); and the positive electrode liquid inlet (13) and the positive electrode liquid outlet (14) are both mounted on the positive electrode pressing plate (11); The negative electrode pressing frame (2) comprises a negative electrode pressing plate (21), a negative collector (22), a negative electrode liquid inlet (23) and a negative electrode liquid outlet (24); the negative collector (22) is mounted on the negative electrode pressing plate (21); and the negative electrode liquid inlet (23) and the negative electrode liquid outlet (24) are both mounted on the negative electrode pressing plate (21).

10. The modular all-vanadium liquid flow battery system according to claim 1, characterized in that: 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 bolt is inserted through the positive pressure frame (1), the negative pressure frame (2) and the plurality of single cells (4); the positive locking nut (52) is threadedly connected to the locking screw (51) and is located at one end of the locking screw (51) close to the positive pressure frame (1); and the negative The positive pole locking nut (53) is threadedly connected to the locking screw (51) and is located at one end of the locking screw (51) close to the negative pole pressure frame (2); the positive pole spring (54) is sleeved on the locking screw (51) and is supported between the positive pole locking nut (52) and the positive pole pressure frame (1); and the negative pole spring (55) is sleeved on the locking screw (51) and is supported between the negative pole locking nut (53) and the negative pole pressure frame (2).

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