Test pile for vanadium battery

Abstract

The utility model relates to the field of vanadium redox flow batteries, in particular to a test stack for a vanadium battery, which comprises a pair of symmetrically arranged multifunctional plates, a copper electrode compressed between the two multifunctional plates, a bipolar plate, a graphite felt and an ion exchange membrane, first embedding grooves used for embedding the bipolar plate and the graphite felt are formed in the end faces, close to each other, of the multifunctional plates, liquid separation holes are formed in the side walls of the first embedding grooves, and main paths communicated with the liquid separation holes are formed in the multifunctional plates. The electrode frame and the end plate are integrally arranged to form the multifunctional plate, on one hand, the multifunctional plate plays a role in supporting the galvanic pile, on the other hand, the multifunctional plate has liquid inlet and outlet functions, and meanwhile, after the end plate and the electrode frame are integrally designed, one sealing layer can be reduced, and the possibility of electrolyte leakage is reduced.

Description

Technical Field

[0001] This application relates to the field of vanadium redox flow batteries, and more particularly to a test stack for vanadium batteries. Background Technology

[0002] A vanadium redox flow battery is a redox battery that uses vanadium as the active material in a circulating liquid state. The electrical energy of the vanadium battery is stored as chemical energy in a sulfuric acid electrolyte containing vanadium ions of different valence states. An external pump forces the electrolyte into the battery stack, where it circulates within different storage tanks and half-cells under mechanical force. A proton exchange membrane serves as the separator in the battery pack. The electrolyte solution flows parallel across the electrode surfaces and undergoes electrochemical reactions. Current is collected and conducted through dual electrode plates, thus converting the chemical energy stored in the solution into electrical energy.

[0003] The existing utility model patent with publication number CN221708743U discloses a buffered flow battery stack, which includes a stack end plate, a copper plate and a bipolar plate, with a buffer pad added between the stack end plate and the copper plate; the stack end plate is located on the outermost side of the buffered flow battery stack, and the stack end plate, buffer pad, copper plate and bipolar plate are stacked from the outside to the inside.

[0004] In the above technical solution, the fuel cell stack end plates, copper plates, and bipolar plates are bonded together by pressure. The fuel cell stack has many sealing surfaces, which can easily lead to electrolyte leakage. Utility Model Content

[0005] To solve the above-mentioned technical problems, this application provides a vanadium battery test stack with the following technical solution:

[0006] A test stack for vanadium batteries includes a pair of symmetrically arranged multifunctional plates, a copper electrode pressed between the two multifunctional plates, a bipolar plate, a graphite felt, and an ion exchange membrane; a first embedding groove for embedding the bipolar plate and the graphite felt is formed on the end face of the multifunctional plates that are close to each other, a liquid distribution hole is formed on the side wall of the first embedding groove, and a main channel connecting the liquid distribution hole is formed on the multifunctional plate.

[0007] Preferably, the bottom of the first embedding groove is provided with a second embedding groove for placing a copper electrode, a copper sheet is connected to the copper electrode, the bottom of the second embedding groove is provided with a snap-fit ​​hole that penetrates the multifunctional board, the copper sheet is inserted through the snap-fit ​​hole, and the copper electrode is located between the bipolar plate and the multifunctional board.

[0008] Preferably, the sidewall of the first embedding groove with the liquid distribution hole is inclined, so that there is a gap between the liquid distribution hole and the graphite felt.

[0009] Preferably, a sealing surface higher than its own plane is provided on the surface of the multi-functional panel that is close to each other, and the first embedding groove is opened in the sealing surface; it also includes a sealing gasket disposed between the two multi-functional panels, and the sealing gasket is clamped between the two sealing surfaces.

[0010] Preferably, the side wall of the multi-functional board has an installation hole that connects to the main road, the installation hole coincides with the axis of the main road, and an internal threaded filler is installed in the installation hole.

[0011] Preferably, it also includes bolts that pass through both multifunctional plates and nuts that are screwed onto the bolts to fix the two multifunctional plates.

[0012] Preferably, the bipolar plate and the first embedding slot are fixedly connected.

[0013] Preferably, the bipolar plate is located between the graphite felt and the copper electrode, and the sealing gasket and ion exchange membrane are located between the two graphite felts.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] 1. This application integrates the electrode frame and end plate into a multifunctional plate. The multifunctional plate serves to support the fuel cell stack and provides the main channel and distribution holes for electrolyte to enter and exit the graphite felt. Furthermore, by integrating the end plate and electrode frame, one sealing layer can be reduced, thus lowering the possibility of electrolyte leakage.

[0016] 2. This application has a sealing surface, and a first embedding groove is formed on the sealing surface. A second embedding groove is formed on the first embedding groove. The copper electrode is embedded in the second embedding groove, and the bipolar plate and the first embedding groove are fixed, thereby improving the overall sealing performance of the fuel cell stack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0018] Figure 2 This is an exploded view of an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the overall structure of the multi-functional board in the embodiments of this application.

[0020] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0021] Explanation of reference numerals in the attached drawings: 1. Multifunctional plate; 11. First clearance hole; 12. Mounting hole; 13. Main channel; 14. Sealing surface; 15. Inclined surface; 16. Liquid distribution hole; 17. First embedding groove; 18. Second embedding groove; 19. Snap-fit ​​hole; 2. Bolt; 3. Nut; 4. Internal thread filler core; 5. Copper electrode; 51. Copper sheet; 6. Bipolar plate; 7. Graphite felt; 8. Sealing gasket; 81. Second clearance hole; 9. Ion exchange membrane. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0023] This application discloses a test stack for vanadium batteries. (Refer to...) Figure 1 , Figure 2 A test stack for vanadium batteries includes two multifunctional plates 1, each rectangular in shape and made of PVC. It also includes two copper electrodes 5, two bipolar plates 6, two graphite felts 7, a sealing gasket 8, and an ion exchange membrane 9, all disposed between the two multifunctional plates 1. The copper electrodes 5, bipolar plates 6, and graphite felts 7 are all rectangular.

[0024] refer to Figure 3 The multi-functional board 1 has a rectangular sealing surface 14 protruding from its own surface. The sealing surface 14 is 1 mm higher than the surface of the multi-functional board 1, and its area is smaller than that of the multi-functional board 1. The four corners are rounded. A first embedding groove 17 is formed on the sealing surface 14. A second embedding groove 18 is formed at the bottom of the first embedding groove 17. The depth of the first embedding groove 17 is equal to the sum of the thicknesses of the bipolar plate 6 and the graphite felt 7. The depth of the second embedding groove 18 is equal to the thickness of the copper electrode 5. The length and width of the first embedding groove 17 are the same as the dimensions of the bipolar plate 6 and the graphite felt 7. The length and width of the second embedding groove 18 are the same as the length and width of the copper electrode 5. The bottom wall of the second embedding groove 18 has two symmetrically arranged snap-fit ​​holes 19. The snap-fit ​​holes 19 penetrate through the multi-functional plate 1. Two copper sheets 51 are fixedly connected to the copper electrode 5. When the copper electrode 5 is embedded in the second embedding groove 18, the copper sheets 51 are inserted through the snap-fit ​​holes 19, and the length of the copper sheets 51 is greater than the depth of the snap-fit ​​holes 19, so that a part of the copper sheets 51 protrudes out of the multi-functional plate 1.

[0025] refer to Figure 1 and Figure 3 This application has four mounting holes 12 and a main circuit 13 connected to the mounting holes 12. The four mounting holes 12 are respectively the positive electrolyte inlet, the negative electrolyte inlet, the positive electrolyte outlet, and the negative electrolyte outlet. The mounting holes 12 are opened on the side wall of the multi-functional plate 1 and have a circular cross-section. The main circuit 13 has a circular cross-section and is coaxial with the mounting holes 12, but its diameter is smaller than that of the mounting holes 12. An internally threaded manifold 4 is installed in the mounting holes 12 for connecting external pipelines.

[0026] refer to Figure 3 and Figure 4 The upper and lower side walls of the first embedding groove 17 are inclined. When the bipolar plate 6 and graphite felt 7 are embedded therein, there is a gap between the graphite felt 7 and the upper and lower side walls. A row of liquid distribution holes 16 are opened on the upper and lower side walls. The liquid distribution holes 16 are connected to the main road 13. Multiple liquid distribution holes 16 are arranged at equal intervals.

[0027] refer to Figure 2 , Figure 3 The multi-functional plate 1 has multiple first clearance holes 11, and the sealing surface 14 is surrounded between the multiple first clearance holes 11. The sealing gasket 8 has a second clearance hole 81 corresponding to the first clearance hole 11. Bolts 2 are inserted into the first clearance holes 11 and the second clearance holes 81, and nuts 3 are screwed onto the bolts 2 to fix the two multi-functional plates 1.

[0028] The implementation principle of a vanadium battery test stack according to an embodiment of this application is as follows:

[0029] 1. The copper electrode 5 is embedded in the second embedding groove 18, and the copper sheet 51 is inserted into the snap-fit ​​hole 19.

[0030] 2. Apply sealant to the periphery of the bipolar plate 6 and snap it into the first embedding groove 17 to fix the bipolar plate 6 and the multifunctional plate 1 with sealant.

[0031] 3. Place the sealing gasket 8 and ion exchange membrane on the sealing surface 14, press the two multi-functional plates 1 together, insert the bolts 2, and fix the fuel cell stack with the nuts 3.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A test stack for a vanadium cell, characterized by: The application relates to a multifunctional plate (1), a copper electrode (5), a bipolar plate (6), a graphite felt (7) and an ion exchange membrane (9) which are symmetrically arranged; a first embedding groove (17) for embedding the bipolar plate (6) and the graphite felt (7) is arranged on the end face of the multifunctional plate (1) which faces each other; a distribution hole (16) is arranged on the side wall of the first embedding groove (17); a main trunk (13) is arranged on the multifunctional plate (1) and communicates with the distribution hole (16); a second embedding groove (18) for placing the copper electrode (5) is arranged at the bottom of the first embedding groove (17); a copper sheet (51) is connected to the copper electrode (5); a clamping hole (19) is arranged at the bottom of the second embedding groove (18) and penetrates the multifunctional plate (1); the copper sheet (51) penetrates the clamping hole (19); the copper electrode (5) is located between the bipolar plate (6) and the multifunctional plate (1); the side wall of the first embedding groove (17) where the distribution hole (16) is arranged is arranged in an inclined mode, so that a gap is formed between the distribution hole (16) and the graphite felt (7).

2. The test stack for a vanadium cell according to claim 1, characterized in that: A sealing surface (14) which is higher than the plane of the multifunctional plate (1) is arranged on the face of the multifunctional plate (1) which faces each other; the first embedding groove (17) is arranged on the sealing surface (14); a sealing gasket (8) is arranged between the two multifunctional plates (1); the sealing gasket (8) is clamped between the two sealing surfaces (14).

3. The test stack for a vanadium cell according to claim 2, characterized in that: A mounting hole (12) which communicates with the main trunk (13) is arranged on the side wall of the multifunctional plate (1); the mounting hole (12) is coaxial with the axis of the main trunk (13); an internally-threaded core (4) is mounted in the mounting hole (12).

4. The test stack for a vanadium cell according to claim 3, characterized in that: A bolt (2) which penetrates the two multifunctional plates (1) and a nut (3) which is screwed on the bolt (2) to fix the two multifunctional plates (1) are further arranged.

5. The test stack for a vanadium cell according to claim 4, characterized in that: The bipolar plate (6) is fixedly connected with the first embedding groove (17).

6. The test stack for a vanadium cell according to claim 5, characterized in that: The bipolar plate (6) is located between the graphite felt (7) and the copper electrode (5); the sealing gasket (8) and the ion exchange membrane (9) are located between the two graphite felts (7).

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