Vanadium redox flow battery structure with replaceable electrodes

Abstract

The utility model provides the full vanadium liquid flow battery structure of convenient replacement electrode relates to full vanadium liquid flow battery technical field, including box body, the inside of box body is provided with sealing plate and sealing washer, the top fixed mounting of sealing plate has the cover plate, the top fixed mounting of cover plate has the protruding piece and the connecting block and the connecting groove, the bottom fixed mounting of cover plate has the side plate and fixed block, the inside of fixed block is provided with threaded rod, the inside of box body is provided with diaphragm, the left side of diaphragm is provided with mounting plate A and positive plate and card block A, has realized the accurate control to electrode spacing and pressure, has reduced the operation difficulty, the linkage sliding rail system of bipolar plate and mounting rod, cooperate the positioning restraint of limit block, both guarantee the stability of electrode assembly, also avoided the problem of poor contact because of misoperation, the adaptability design of diaphragm and installation slot, effectively isolated positive and negative pole area, improved the security and electrochemical performance of battery operation.

Description

Technical Field

[0001] This utility model relates to the field of vanadium redox flow battery technology, and in particular to a vanadium redox flow battery structure with easily replaceable electrodes. Background Technology

[0002] A vanadium redox flow battery uses vanadium ion solutions of different valence states as the positive and negative electrode electrolytes. An external pump drives the electrolyte to circulate between a storage tank and the battery stack. The electrolyte undergoes redox reactions within the stack to achieve the charging and discharging process. A vanadium redox flow battery consists of a stack, electrolyte, and piping system including pumps. The stack includes an ion-conducting membrane, a flow frame, electrodes, bipolar (single) electrodes, and current collectors. Each individual cell in the stack is centered around the ion-conducting membrane, with electrodes and a flow frame at each end, followed by bipolar (single) electrodes. Sealing elements are present between the ion-conducting membrane and the flow frame, and between the flow frame and the bipolar (single) electrodes. Several or dozens of individual cells are clamped between two stainless steel end plates and compressed using a filter press to form a stack. The electrolyte circulates between the storage tank and the battery stack, inevitably passing through the flow frame. The flow frame plays a crucial role in distributing the electrolyte flow within the stack and preventing leakage. The sealing element primarily seals the electrolyte to prevent leakage. The bipolar (single) plates mainly separate the individual cells within the stack and collect and transport current. Because the flow frame, sealing element, and bipolar (single) plates are indispensable to the battery stack, their structure and materials directly affect the stability and performance of the vanadium redox flow battery.

[0003] In existing technologies, such as the Chinese patent application CN203659985U, a flow battery electrode structure and an all-vanadium redox flow battery are disclosed. The bipolar plates are flat plate structures with grooves in the middle of both sides. Liquid distribution channels connected to the grooves are engraved at the opposite edges of the grooves on each side of the plate. The channels on opposite edges of one side of the plate are respectively connected to the positive electrode inlet and outlet, and the channels on opposite edges of the other side of the plate are respectively connected to the negative electrode inlet and outlet. This eliminates the need for a flow frame and a seal between the bipolar (single) plates, simplifies the assembly process, reduces electrolyte leakage, and improves the stability of battery operation.

[0004] The above-mentioned technology has achieved the effect of allowing multiple people to use it simultaneously, but there are still some shortcomings, specifically: Traditional vanadium redox flow battery structures typically employ rigid fixed frames, requiring complete disassembly of the battery body for electrode replacement. This process is time-consuming, labor-intensive, and prone to sealing failure. The lack of directional guide rails in assembly means that relying on manual experience to adjust electrode positions makes it difficult to ensure consistency. Furthermore, the electrode fastening mechanism is simplistic, requiring repeated application of force with specialized tools, which is not only inefficient but may also damage the electrode surface due to improper operation. Summary of the Invention

[0005] The vanadium redox flow battery structure proposed in this invention allows for convenient electrode replacement, achieving precise control over electrode spacing and pressure, reducing operational difficulty. The linkage slide rail system between the bipolar plates and the mounting rod, combined with the positioning constraint of the limiting block, ensures the stability of electrode assembly and avoids poor contact caused by misoperation. The adaptability design of the separator and the mounting groove effectively isolates the positive and negative electrode areas, improving the safety and electrochemical performance of battery operation, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a vanadium redox flow battery structure with easily replaceable electrodes, comprising a housing, wherein a sealing plate and a sealing gasket are provided inside the housing, a cover plate is fixedly installed on the top of the sealing plate, a protrusion, a connecting block and a connecting groove are fixedly installed on the top of the cover plate, a side plate and a fixing block are fixedly installed on the bottom of the cover plate, a threaded rod is provided inside the fixing block, a diaphragm is provided inside the housing, a mounting plate A, a positive electrode plate and a locking block A are provided on the left side of the diaphragm, a mounting plate B, a negative electrode plate and a locking block B are provided on the right side of the diaphragm, bipolar plates are provided on the sides of the mounting plates A and B, fixing plates A and B are provided on the sides of the bipolar plates, an mounting rod is provided inside the fixing plates A and B, and a limiting block B and a limiting block A are fixedly installed on the side of the mounting rod.

[0007] Preferably, the sealing plate is slidably connected to the box body through the sealing groove, the sealing gasket is slidably connected to the box body through the sealing groove, and the connecting blocks are symmetrically distributed on the left and right ends of the top of the cover plate.

[0008] Preferably, the side plates are symmetrically distributed at the bottom left and right ends of the cover plate, the side plates are slidably connected to the box body, the threaded rod is rotatably connected to the fixed block through the fixed groove, the threaded rod is rotatably connected to the box body through the threaded groove, a handle is fixedly installed on the side of the threaded rod, and a tool groove is opened on the right side of the handle.

[0009] Preferably, the diaphragm is evenly distributed inside the housing. The diaphragm is slidably connected to the mounting rod via mounting groove A. The mounting plate A is slidably connected to the mounting rod via mounting groove B. The positive electrode is slidably connected to the mounting plate A. The locking block A is slidably connected to the mounting plate A via locking groove A. The mounting plate B is slidably connected to the mounting rod via mounting groove C. The negative electrode is slidably connected to the mounting plate B. The locking block B is slidably connected to the mounting plate B via locking groove B. The bipolar plate is slidably connected to the mounting rod via mounting groove D.

[0010] Preferably, the mounting rod is slidably connected to the fixing plate A via the positioning groove A, and the mounting rod is slidably connected to the fixing plate B via the positioning groove B. The top end of the fixing plate A is provided with a groove A and a fixing rod A, the top end of the fixing plate B is provided with a groove B and a fixing rod B, the limiting block A is slidably connected to the box body via the limiting groove A, and the limiting block B is slidably connected to the box body via the limiting groove B.

[0011] Preferably, the surface of the protrusion is provided with a soft pad, the surface of the protrusion is provided with a sleeve plate, and a protective plate is fixedly installed on the top of the sleeve plate.

[0012] Preferably, the sleeve plate is slidably connected to the protrusion via a groove, and the guard plate is slidably connected to the connecting block via a groove.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the limiting groove A, limiting groove B, sealing groove, sealing plate, sealing gasket, cover plate, protrusion, connecting block, connecting groove, side plate, fixing block, fixing groove, threaded rod, throttle, tool groove, threaded groove, diaphragm, mounting groove A, mounting plate A, mounting groove B, slot A, positive electrode sheet, slot A, mounting plate B, mounting groove C, slot B, negative electrode sheet, slot B, bipolar plate, mounting groove D, fixing plate A, positioning groove A, groove A, fixing rod A, mounting rod, limiting block B, limiting block A, fixing plate B, positioning groove B, groove B, and fixing rod B achieve precise control of electrode spacing and pressure, reducing the difficulty of operation. The linkage slide rail system of bipolar plate and mounting rod, combined with the positioning constraint of limiting block, not only ensures the stability of electrode assembly, but also avoids poor contact caused by misoperation. The adaptability design of diaphragm and mounting groove effectively isolates positive and negative electrode areas, improving the safety and electrochemical performance of battery operation.

[0014] 2. In this utility model, the soft pad, sleeve plate, protective plate, and sliding groove optimize the operation experience and protection performance of the battery assembly. The soft pad effectively absorbs the impact force during the assembly process and reduces the risk of damage to key parts caused by friction or collision. The layered protection design of the sleeve plate and protective plate isolates external impurities from entering sensitive areas and provides a safety barrier for operators. The introduction of the sliding groove structure allows the sleeve plate and protective plate to slide flexibly along the protrusions and connecting blocks, achieving precise positioning and quick assembly and disassembly, which not only ensures the alignment accuracy of the assembly but also simplifies the maintenance process. Attached Figure Description

[0015] Figure 1 A three-dimensional structural view of the all-vanadium redox flow battery structure with easily replaceable electrodes proposed in this utility model; Figure 2 An exploded perspective view of the housing structure of the all-vanadium redox flow battery structure with easily replaceable electrodes proposed in this utility model; Figure 3 An exploded perspective view of the cover plate of the all-vanadium redox flow battery structure for which electrodes can be easily replaced, as proposed in this utility model. Figure 4 This invention proposes an all-vanadium redox flow battery structure with easily replaceable electrodes. Figure 3 Enlarged 3D view of the structure at point A; Figure 5 An exploded bottom-view perspective view of the cover plate structure of the all-vanadium redox flow battery with easily replaceable electrodes proposed in this utility model. Figure 6 An exploded perspective view of the electrode sheet structure of the all-vanadium redox flow battery structure for which electrodes can be easily replaced, as proposed in this utility model. Figure 7 An exploded perspective view of the fixed plate structure of the all-vanadium redox flow battery structure for which electrodes can be easily replaced, as proposed in this utility model.

[0016] Legend: 1. Box body; 2. Limiting groove A; 3. Limiting groove B; 4. Sealing groove; 5. Sealing plate; 6. Sealing gasket; 7. Cover plate; 8. Protrusion; 9. Connecting block; 10. Connecting groove; 11. Side plate; 12. Fixing block; 13. Fixing groove; 14. Threaded rod; 15. Turning handle; 16. Tool slot; 17. Threaded groove; 18. Diaphragm; 19. Mounting groove A; 20. Mounting plate A; 21. Mounting groove B; 22. Slot A; 23. Positive electrode plate; 24. Locking block A 25. Mounting plate B; 26. Mounting groove C; 27. Slot B; 28. Negative electrode sheet; 29. ​​Locking block B; 30. Bipolar plate; 31. Mounting groove D; 32. Fixing plate A; 33. Positioning groove A; 34. Groove A; 35. Fixing rod A; 36. Mounting rod; 37. Limiting block B; 38. Limiting block A; 39. Fixing plate B; 40. Positioning groove B; 41. Groove B; 42. Fixing rod B; 43. Soft pad; 44. Sleeve plate; 45. Protective plate; 46. Slide groove. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example 1: As Figures 1-7As shown, this utility model provides a technical solution: a vanadium redox flow battery structure with easily replaceable electrodes, including a housing 1. The housing 1 contains a sealing plate 5 and a sealing gasket 6. A cover plate 7 is fixedly installed at the top of the sealing plate 5. A protrusion 8, a connecting block 9, and a connecting groove 10 are fixedly installed at the top of the cover plate 7. A side plate 11 and a fixing block 12 are fixedly installed at the bottom of the cover plate 7. A threaded rod 14 is provided inside the fixing block 12. A diaphragm 18 is provided inside the housing 1. A mounting plate A20, a positive electrode plate 23, and a locking block A24 are provided on the left side of the diaphragm 18. A mounting plate B25, a negative electrode plate 28, and a locking block B29 are provided on the right side of the diaphragm 18. Bipolar plates 30 are provided on the sides of mounting plate A20 and mounting plate B25. Fixing plates A32 and B39 are provided on the sides of bipolar plates 30. Mounting rods 36 are provided inside fixing plates A32 and B39. Limiting blocks B37 and A38 are fixedly mounted on the sides of mounting rods 36. Sealing plate 5 is slidably connected to box body 1 via sealing groove 4. Sealing gasket 6 is slidably connected to box body 1 via sealing groove 4. Connecting blocks 9 are symmetrically distributed at the top left and right ends of cover plate 7. Side plates 11 are symmetrically distributed at the bottom left and right ends of cover plate 7. Side plates 11 are slidably connected to box body 1. Threaded rods 14 are connected to fixing blocks via fixing grooves 13. The screw rod 14 is rotatably connected to the housing 1 via the threaded groove 17. A handle 15 is fixedly installed on the side of the screw rod 14. A tool slot 16 is opened on the right side of the handle 15. The diaphragm 18 is evenly distributed inside the housing 1. The diaphragm 18 is slidably connected to the mounting rod 36 via the mounting groove A19. The mounting plate A20 is slidably connected to the mounting rod 36 via the mounting groove B21. The positive electrode 23 is slidably connected to the mounting plate A20. The locking block A24 is slidably connected to the mounting plate A20 via the locking groove A22. The mounting plate B25 is slidably connected to the mounting rod 36 via the mounting groove C26. The negative electrode 28 is slidably connected to the mounting rod 36 via the mounting groove C26. Plates B25 are slidably connected. Block B29 is slidably connected to mounting plate B25 via slot B27. Bipolar plate 30 is slidably connected to mounting rod 36 via mounting groove D31. Mounting rod 36 is slidably connected to fixing plate A32 via positioning groove A33. Mounting rod 36 is slidably connected to fixing plate B39 via positioning groove B40. The top of fixing plate A32 is provided with groove A34 and fixing rod A35. The top of fixing plate B39 is provided with groove B41 and fixing rod B42. Limiting block A38 is slidably connected to box 1 via limiting groove A2. Limiting block B37 is slidably connected to box 1 via limiting groove B3.

[0020] In this embodiment, the ease of electrode replacement and maintenance efficiency of the vanadium redox flow battery are improved. A sliding sealing plate 5 cooperates with the housing 1, combined with a block-slot electrode fixing mechanism, to achieve quick pull-out replacement of the positive electrode 23, negative electrode 28, and bipolar plate 30 without disassembling the entire battery system. The adjustment device linked by the threaded rod 14 and the throttle 15, along with the limiting block, ensures precise positioning and stability and consistency of electrode assembly. The sliding connection design between the separator 18 and the mounting rod 36 optimizes the ion transport path and facilitates group maintenance. The double protection of the sealing gasket 6 and the sealing groove 4 effectively prevents electrolyte leakage. The overall structure, through the symmetrically distributed side plates 11, connecting blocks 9, and tool slots 16, forms a standardized operating interface, which significantly shortens the electrode replacement time, reduces maintenance difficulty, and improves the reliability and economy of the battery system.

[0021] Example 2: As Figures 1-3 , Figure 5 As shown, a soft pad 43 is provided on the surface of the protrusion 8, a sleeve plate 44 is provided on the surface of the protrusion 8, a protective plate 45 is fixedly installed on the top of the sleeve plate 44, the sleeve plate 44 is slidably connected to the protrusion 8 through a sliding groove 46, and the protective plate 45 is slidably connected to the connecting block 9 through a sliding groove 46.

[0022] In this embodiment, the assembly protection and operational convenience of the battery system are improved. The soft pad 43 on the surface of the protrusion 8 effectively buffers the frictional loss between components. The sleeve 44 cooperates with the sliding groove 46 of the protrusion 8 to achieve quick disassembly and positioning. The sliding connection between the protective plate 45 and the connecting block 9 forms a dynamic protective barrier, which not only ensures the stability of the electrode assembly, but also facilitates daily inspection and maintenance. The collaborative design of the multi-layer sliding structure allows each functional module to be adjusted independently, reducing the risk of assembly error. At the same time, the intervention of soft materials reduces metal fatigue damage, thus improving the overall reliability, maintainability and service life of the battery system.

[0023] The working principle of this embodiment is as follows: When it is necessary to replace the positive electrode 23 and the negative electrode 28 after a long period of use, first turn the handle 15 through the tool slot 16, so that the handle 15 drives the threaded rod 14 to rotate together. At this time, the threaded rod 14 rotates outward through the threaded groove 17 inside the box 1. When the threaded rod 14 is completely rotated out of the box 1 through the threaded groove 17, it can be removed from the inside of the fixing block 12 through the fixing groove 13. At this time, the cover plate 7 can be pinched and pulled upward, so that the sealing plate 5 drives the sealing gasket 6 to slide upward through the sealing groove 4 inside the box 1. When the sealing plate 5 drives the sealing gasket 6... After the cover plate 7 has completely slid out of the box 1, and the fixing block 12 has disengaged from the top of the box 1 via the side plate 11, the fixing rods A35 and B42 inside the groove A34 and B41 are pulled upwards, causing the fixing plates A32 and B39 to slide upwards inside the box 1. The limiting block B37 slides upwards inside the box 1 via the limiting groove B3, and the limiting block A38 slides upwards inside the box 1 via the limiting groove A2. Once completely slid out of the box 1, the limiting block B37 is pulled to the right, causing it to move the mounting rod. 36 slide together to the right. At this time, the mounting rod 36 slides to the right inside the fixing plate B39 through the positioning groove B40 and inside the fixing plate A32 through the positioning groove A33. During the sliding process, the mounting rod 36 slides inside the bipolar plate 30 through the mounting groove D31 and inside the mounting plate B25 through the mounting groove C26. When the mounting plate B25 has completely slid out of the surface of the mounting rod 36, the negative electrode 28 can be removed from the inside of the mounting plate B25. At this time, the locking block B29 disengages from the inside of the mounting plate B25 through the locking groove B27. Then, the mounting plate A20 is then... Remove the positive electrode 23 from the surface of the mounting rod 36 through the mounting groove B21. Then remove the positive electrode plate 23 from the inside of the mounting plate A20. Let the locking block A24 disengage from the inside of the mounting plate A20 through the locking groove A22. Finally, remove the diaphragm 18 from the surface of the mounting rod 36 through the mounting groove A19 for replacement. When not in use, first remove the connecting wire from the inside of the connecting block 9 through the connecting groove 10. Then pinch the protective plate 45, align the sleeve plate 44 with the protrusion 8 and press it down. Let the sleeve plate 44 slide down on the top of the protrusion 8 through the sliding groove 46. Then the soft pad 43 can fix the sleeve plate 44 on the surface of the protrusion 8.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A vanadium redox flow battery structure with easily replaceable electrodes, comprising a housing (1), characterized in that: The box body (1) is provided with a sealing plate (5) and a sealing gasket (6) inside. A cover plate (7) is fixedly installed on the top of the sealing plate (5). A protrusion (8), a connecting block (9), and a connecting groove (10) are fixedly installed on the top of the cover plate (7). A side plate (11) and a fixing block (12) are fixedly installed on the bottom of the cover plate (7). A threaded rod (14) is provided inside the fixing block (12). A diaphragm (18) is provided inside the box body (1). An mounting plate A (20) and a positive electrode plate ( ) are provided on the left side of the diaphragm (18). 23) and a card block A (24), the right side of the diaphragm (18) is provided with a mounting plate B (25) and a negative electrode plate (28) and a card block B (29), the sides of the mounting plate A (20) and the mounting plate B (25) are provided with a bipolar plate (30), the sides of the bipolar plate (30) are provided with a fixing plate A (32) and a fixing plate B (39), the inside of the fixing plate A (32) and the fixing plate B (39) is provided with a mounting rod (36), and the side of the mounting rod (36) is fixedly installed with a limiting block B (37) and a limiting block A (38).

2. The all-vanadium redox flow battery structure with easily replaceable electrodes according to claim 1, characterized in that: The sealing plate (5) is slidably connected to the box body (1) through the sealing groove (4), the sealing gasket (6) is slidably connected to the box body (1) through the sealing groove (4), and the connecting blocks (9) are symmetrically distributed on the top left and right ends of the cover plate (7).

3. The all-vanadium redox flow battery structure with easily replaceable electrodes according to claim 1, characterized in that: The side plates (11) are symmetrically distributed at the bottom left and right ends of the cover plate (7). The side plates (11) are slidably connected to the box body (1). The threaded rod (14) is rotatably connected to the fixed block (12) through the fixed groove (13). The threaded rod (14) is rotatably connected to the box body (1) through the threaded groove (17). A throttle (15) is fixedly installed on the side of the threaded rod (14). A tool slot (16) is opened on the right side of the throttle (15).

4. The all-vanadium redox flow battery structure with easily replaceable electrodes according to claim 1, characterized in that: The diaphragm (18) is evenly distributed inside the box (1). The diaphragm (18) is slidably connected to the mounting rod (36) through the mounting groove A (19). The mounting plate A (20) is slidably connected to the mounting rod (36) through the mounting groove B (21). The positive electrode (23) is slidably connected to the mounting plate A (20). The locking block A (24) is slidably connected to the mounting plate A (20) through the locking groove A (22). The mounting plate B (25) is slidably connected to the mounting rod (36) through the mounting groove C (26). The negative electrode (28) is slidably connected to the mounting plate B (25). The locking block B (29) is slidably connected to the mounting plate B (25) through the locking groove B (27). The bipolar plate (30) is slidably connected to the mounting rod (36) through the mounting groove D (31).

5. The all-vanadium redox flow battery structure with easily replaceable electrodes according to claim 1, characterized in that: The mounting rod (36) is slidably connected to the fixing plate A (32) through the positioning groove A (33), the mounting rod (36) is slidably connected to the fixing plate B (39) through the positioning groove B (40), the top of the fixing plate A (32) is provided with a groove A (34) and a fixing rod A (35), the top of the fixing plate B (39) is provided with a groove B (41) and a fixing rod B (42), the limiting block A (38) is slidably connected to the box body (1) through the limiting groove A (2), and the limiting block B (37) is slidably connected to the box body (1) through the limiting groove B (3).

6. The all-vanadium redox flow battery structure with easily replaceable electrodes according to claim 1, characterized in that: The surface of the protrusion (8) is provided with a soft pad (43), the surface of the protrusion (8) is provided with a sleeve plate (44), and a protective plate (45) is fixedly installed on the top of the sleeve plate (44).

7. The all-vanadium redox flow battery structure with easily replaceable electrodes according to claim 6, characterized in that: The sleeve (44) is slidably connected to the protrusion (8) through the slide groove (46), and the guard plate (45) is slidably connected to the connecting block (9) through the slide groove (46).

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