Real-time measurement device for valence state of electrolyte of all-vanadium redox flow battery

Abstract

The utility model discloses an all-vanadium redox flow battery electrolyte valence state real-time measuring device which comprises a negative electrode electrolyte storage tank, a galvanic pile is arranged on one side of the negative electrode electrolyte storage tank, the negative electrode electrolyte storage tank and the galvanic pile are connected through a pipeline via a negative electrode magnetic drive pump to form a circulation loop, and a positive electrode electrolyte storage tank is arranged on the other side of the galvanic pile. The positive electrode electrolyte storage tank and the electric pile form a circulation loop through a pipeline via a positive electrode magnetic pump, the side wall of the negative electrode electrolyte storage tank is connected with a negative electrode communicating vessel through a pipeline, the negative electrode communicating vessel is connected with a negative electrode standard solution colorimetric card, and the side wall of the positive electrode electrolyte storage tank is connected with a positive electrode communicating vessel through a pipeline; and the anode communicating vessel is connected with an anode standard solution colorimetric card. Through the arrangement of the communicating vessel, the color of the electrolyte in the electrolyte storage tank can be observed through the communicating vessel, and the valence state of the electrolyte in the storage tank at present can be measured in real time through comparison with a standard liquid colorimetric card beside the communicating vessel, so that the testing process is simplified, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of all-vanadium liquid flow batteries, in particular to a real-time measurement device for the valence state of an electrolyte in an all-vanadium liquid flow battery. Background Art

[0002] All-vanadium flow batteries achieve the mutual conversion of electrical and chemical energy through electrochemical redox reactions on the electrode surfaces of vanadium ions of varying valence in the electrolyte solution, enabling the storage and release of electrical energy. The positive electrode utilizes a pentavalent vanadium ion / quadrivalent vanadium ion pair, while the negative electrode utilizes a trivalent vanadium ion / divalent vanadium ion pair. Sulfuric acid or a mixed acid serves as the supporting electrolyte, and water serves as the solvent. During testing, the overall valence of the electrolyte shifts. To accurately calculate the battery's SOC, it's necessary to understand the current concentration of vanadium ions in each valence. Since vanadium ions of different valences have different colors, the current electrolyte valence can be determined by the color change, requiring real-time knowledge of the electrolyte's valence.

[0003] In the prior art, the only way to test the valence of the electrolyte is to take the electrolyte out of the electrolyte storage tank, titrate it using a potentiometric titrator, and calculate the valence of the electrolyte. This operation method is complicated and cannot perform real-time detection. Utility Model Content

[0004] The purpose of the utility model is to provide a real-time measurement device for the valence state of an electrolyte of an all-vanadium redox flow battery, which solves the problem in the prior art that the valence state detection steps of the electrolyte are complicated and cannot be detected in real time.

[0005] The technical solution adopted by the present invention is a real-time measurement device for the valence state of an all-vanadium liquid flow battery electrolyte, comprising a negative electrode electrolyte storage tank, a battery stack arranged on one side of the negative electrode electrolyte storage tank, the negative electrode electrolyte storage tank and the battery stack are connected through a pipeline via a negative electrode magnetic pump to form a circulation loop, a positive electrode electrolyte storage tank is arranged on the other side of the battery stack, the positive electrode electrolyte storage tank and the battery stack are connected through a pipeline via a positive electrode magnetic pump to form a circulation loop, the side wall of the negative electrode electrolyte storage tank is connected to a negative electrode communicating vessel through a pipeline, the negative electrode communicating vessel is connected to a negative electrode standard solution colorimetric card, and the side wall of the positive electrode electrolyte storage tank is connected to a positive electrode communicating vessel through a pipeline, and the positive electrode communicating vessel is connected to a positive electrode standard solution colorimetric card.

[0006] The utility model is also characterized in that:

[0007] The negative pole magnetic pump is arranged on the pipeline at the bottom of the negative pole electrolyte storage tank, and the positive pole magnetic pump is arranged on the pipeline at the bottom of the positive pole electrolyte storage tank.

[0008] A reference cell is connected between the pipe at the bottom of the negative electrode electrolyte storage tank and the pipe at the bottom of the positive electrode electrolyte storage tank, and the reference cell is connected in parallel with the battery stack.

[0009] The negative electrode standard solution colorimetric card comprises a plurality of first standard colorimetric card units, each of which is provided with a first cuvette at the bottom, each of which is sealed with a first cover sheet, and the space between each first cuvette and the first cover sheet is filled with negative electrode standard solution.

[0010] The cathode standard solution colorimetric card includes several second standard colorimetric card units. The bottom of each second standard colorimetric card unit is a second cuvette. Each second cuvette is sealed with a second cover sheet. The cathode standard solution is filled between each second cuvette and the second cover sheet.

[0011] The negative electrode communicating vessel includes a third cuvette, a third cover is provided on one side of the third cuvette, and the edges of the third cuvette and the third cover are glued to form a rectangular hollow structure; the positive electrode communicating vessel includes a fourth cuvette, a fourth cover is provided on one side of the fourth cuvette, and the edges of the fourth cuvette and the fourth cover are glued to form a rectangular hollow structure.

[0012] Small holes are opened at both ends of the negative electrode connecting tube, and a first connecting tube is provided between the negative electrode connecting tube and the negative electrode electrolyte storage tank. The first connecting tube passes through the small holes and is connected to the negative electrode connecting tube.

[0013] A first fixing bracket is provided on one side of the negative electrode connecting tube and the negative electrode standard solution colorimetric card. The first fixing bracket is provided with a groove. The negative electrode connecting tube and the negative electrode standard solution colorimetric card are engaged in the groove of the first fixing bracket.

[0014] Small holes are opened at both ends of the positive electrode communicating vessel, and a second connecting pipe is provided between the positive electrode communicating vessel and the positive electrode electrolyte storage tank. The second connecting pipe passes through the small holes and is connected to the positive electrode electrolyte storage tank.

[0015] A second fixing bracket is provided on one side of the positive electrode connecting tube and the positive electrode standard solution colorimetric card. The second fixing bracket is provided with a groove. The positive electrode connecting tube and the positive electrode standard solution colorimetric card are engaged in the groove of the second fixing bracket.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model of the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery can observe the color of the electrolyte in the electrolyte storage tank through the connecting pipe. By comparing it with the standard liquid color card next to the connecting pipe, the valence state of the electrolyte in the current storage tank can be measured in real time.

[0018] 2. The utility model of the real-time measurement device for the valence state of the electrolyte of the all-vanadium liquid flow battery can judge the current valence state of the electrolyte by the color of the electrolyte, avoiding frequent titration tests to measure the valence state, simplifying the test process and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the overall structure of the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery of the utility model;

[0020] Figure 2 This is a schematic diagram of a colorimetric card for the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the colorimetric unit in the negative electrode standard solution colorimetric card of the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery of the utility model;

[0022] Figure 4 This is a schematic diagram of the assembly of the colorimetric unit in the negative electrode standard solution colorimetric card of the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery of the present invention;

[0023] Figure 5 This is a schematic diagram of the colorimetric unit structure in the positive electrode standard solution colorimetric card of the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery of the utility model;

[0024] Figure 6 The utility model is a schematic diagram of the assembly of the colorimetric unit in the positive electrode standard solution colorimetric card of the real-time measurement device for the valence state of the electrolyte of the all-vanadium redox flow battery.

[0025] In the figure: 1. Negative electrode electrolyte storage tank; 2. Negative electrode magnetic pump; 3. Negative electrode communicating vessel; 301. First connecting pipe; 302. First fixed bracket; 303. Third cuvette; 304 Third cover; 4. Negative electrode standard solution colorimetric card; 401. First cuvette; 402. First cover; 403. First standard colorimetric card unit; 5. Cell stack; 6. Reference cell; 7. Positive electrode electrolyte storage tank; 8. Positive electrode magnetic pump; 9. Positive electrode communicating vessel; 901. Second connecting pipe; 902. Second fixed bracket; 903. Fourth cuvette; 904 Fourth cover; 10. Positive electrode standard solution colorimetric card; 1001. Second cuvette; 1002. Second cover; 1003. Second standard colorimetric card unit. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] Real-time measurement device for electrolyte valence state of all-vanadium redox flow battery, such as Figure 1 As shown, it includes a negative electrode electrolyte storage tank 1, a battery stack 5 is provided on one side of the negative electrode electrolyte storage tank 1, the negative electrode electrolyte storage tank 1 and the battery stack 5 are connected through a pipeline via a negative electrode magnetic pump 2 to form a circulation loop, and a positive electrode electrolyte storage tank 7 is provided on the other side of the battery stack 5. The positive electrode electrolyte storage tank 7 and the battery stack 5 are connected through a pipeline via a positive electrode magnetic pump 8 to form a circulation loop, and the side wall of the negative electrode electrolyte storage tank 1 is connected to a negative electrode connector 3 through a pipeline, as shown Figure 2As shown, the negative electrode communication tube 3 is connected to a negative electrode standard solution colorimetric card 4, which is a colorimetric card for divalent to tetravalent electrolytes. The side wall of the positive electrode electrolyte storage tank 7 is connected to a positive electrode communication tube 9 via a pipe. The positive electrode communication tube 9 is connected to a positive electrode standard solution colorimetric card 10, which is a colorimetric card for trivalent to pentavalent electrolytes. The negative electrode magnetic pump 2 is set on the pipe at the bottom of the negative electrode electrolyte storage tank 1, and the positive electrode magnetic pump 8 is set on the pipe at the bottom of the positive electrode electrolyte storage tank 7. A reference cell 6 is connected between the pipe at the bottom of the negative electrode electrolyte storage tank 1 and the pipe at the bottom of the positive electrode electrolyte storage tank 7. The reference cell 6 is connected in parallel with the battery stack 5.

[0028] like Figure 3 As shown, the negative electrode feed-through 3 includes a third cuvette 303, with a third cover sheet 304 provided on one side of the third cuvette 303. The edges of the third cuvette 303 and the third cover sheet 304 are glued together to form a rectangular, thin, hollow structure. Small holes are provided at both ends of the negative electrode feed-through 3. A first connecting tube 301 is provided between the negative electrode feed-through 3 and the negative electrolyte storage tank 1. The first connecting tube 301 passes through the small holes and connects to the negative electrode feed-through 3. A first fixing bracket 302 is provided on one side of the negative electrode feed-through 3 and the negative electrode standard solution colorimetric card 4. The first fixing bracket 302 has a groove, and the negative electrode feed-through 3 and the negative electrode standard solution colorimetric card 4 engage within the groove of the first fixing bracket 302.

[0029] like Figure 4 As shown, the negative electrode standard solution colorimetric card 4 includes several first standard colorimetric card units 403, each of which is provided with a first cuvette 401 at the bottom, each of which is sealed with a first cover sheet 402, and the space between each first cuvette 401 and the first cover sheet 402 is filled with a negative electrode standard solution.

[0030] like Figure 5 As shown, the positive electrode feedthrough 9 includes a fourth cuvette 903, with a fourth cover sheet 904 provided on one side of the fourth cuvette 903. The edges of the fourth cuvette 903 and the fourth cover sheet 904 are glued together to form a rectangular, thin, hollow structure. Small holes are provided at both ends of the positive electrode feedthrough 9. A second connecting tube 901 is provided between the positive electrode feedthrough 9 and the positive electrode electrolyte storage tank 7. The second connecting tube 901 passes through the small holes and connects to the positive electrode electrolyte storage tank 7. A second fixing bracket 902 is provided on one side of the positive electrode feedthrough 9 and the positive electrode standard solution colorimetric card 10. The second fixing bracket 902 has a groove, and the positive electrode feedthrough 9 and the positive electrode standard solution colorimetric card 10 are engaged in the groove of the second fixing bracket 902.

[0031] like Figure 6As shown, the cathode standard solution colorimetric card 10 includes several second standard colorimetric card units 1003, each of which has a second cuvette 1001 at the bottom, and each second cuvette 1001 is sealed with a second cover 1002, and the space between each second cuvette 1001 and the second cover 1002 is filled with cathode standard solution.

[0032] Example 1

[0033] Real-time measurement device for electrolyte valence state of all-vanadium redox flow battery, such as Figure 1 As shown, it includes a negative electrode electrolyte storage tank 1, a battery stack 5 is provided on one side of the negative electrode electrolyte storage tank 1, the negative electrode electrolyte storage tank 1 and the battery stack 5 are connected through a pipeline via a negative electrode magnetic pump 2 to form a circulation loop, and a positive electrode electrolyte storage tank 7 is provided on the other side of the battery stack 5. The positive electrode electrolyte storage tank 7 and the battery stack 5 are connected through a pipeline via a positive electrode magnetic pump 8 to form a circulation loop, and the side wall of the negative electrode electrolyte storage tank 1 is connected to a negative electrode connector 3 through a pipeline, as shown Figure 2 As shown, the negative electrode communication tube 3 is connected to a negative electrode standard solution colorimetric card 4, which is a colorimetric card for divalent to tetravalent electrolytes. The side wall of the positive electrode electrolyte storage tank 7 is connected to a positive electrode communication tube 9 via a pipe. The positive electrode communication tube 9 is connected to a positive electrode standard solution colorimetric card 10, which is a colorimetric card for trivalent to pentavalent electrolytes. The negative electrode magnetic pump 2 is set on the pipe at the bottom of the negative electrode electrolyte storage tank 1, and the positive electrode magnetic pump 8 is set on the pipe at the bottom of the positive electrode electrolyte storage tank 7. A reference cell 6 is connected between the pipe at the bottom of the negative electrode electrolyte storage tank 1 and the pipe at the bottom of the positive electrode electrolyte storage tank 7. The reference cell 6 is connected in parallel with the battery stack 5.

[0034] Example 2

[0035] On the basis of Example 1, the present embodiment provides a real-time measurement device for the valence state of the electrolyte of an all-vanadium redox flow battery, such as Figure 1 As shown, it includes a negative electrode electrolyte storage tank 1, a battery stack 5 is provided on one side of the negative electrode electrolyte storage tank 1, the negative electrode electrolyte storage tank 1 and the battery stack 5 are connected through a pipeline via a negative electrode magnetic pump 2 to form a circulation loop, and a positive electrode electrolyte storage tank 7 is provided on the other side of the battery stack 5. The positive electrode electrolyte storage tank 7 and the battery stack 5 are connected through a pipeline via a positive electrode magnetic pump 8 to form a circulation loop, and the side wall of the negative electrode electrolyte storage tank 1 is connected to a negative electrode connector 3 through a pipeline, as shown Figure 2As shown, the negative electrode communication tube 3 is connected to a negative electrode standard solution colorimetric card 4, which is a colorimetric card for divalent to tetravalent electrolytes. The side wall of the positive electrode electrolyte storage tank 7 is connected to a positive electrode communication tube 9 via a pipe. The positive electrode communication tube 9 is connected to a positive electrode standard solution colorimetric card 10, which is a colorimetric card for trivalent to pentavalent electrolytes. The negative electrode magnetic pump 2 is set on the pipe at the bottom of the negative electrode electrolyte storage tank 1, and the positive electrode magnetic pump 8 is set on the pipe at the bottom of the positive electrode electrolyte storage tank 7. A reference cell 6 is connected between the pipe at the bottom of the negative electrode electrolyte storage tank 1 and the pipe at the bottom of the positive electrode electrolyte storage tank 7. The reference cell 6 is connected in parallel with the battery stack 5.

[0036] like Figure 3 As shown, the negative electrode feed-through 3 includes a third cuvette 303, with a third cover sheet 304 provided on one side of the third cuvette 303. The edges of the third cuvette 303 and the third cover sheet 304 are glued together to form a rectangular, thin, hollow structure. Small holes are provided at both ends of the negative electrode feed-through 3. A first connecting tube 301 is provided between the negative electrode feed-through 3 and the negative electrolyte storage tank 1. The first connecting tube 301 passes through the small holes and connects to the negative electrode feed-through 3. A first fixing bracket 302 is provided on one side of the negative electrode feed-through 3 and the negative electrode standard solution colorimetric card 4. The first fixing bracket 302 has a groove, and the negative electrode feed-through 3 and the negative electrode standard solution colorimetric card 4 engage within the groove of the first fixing bracket 302.

[0037] like Figure 4 As shown, the negative electrode standard solution colorimetric card 4 includes several first standard colorimetric card units 403, each of which is provided with a first cuvette 401 at the bottom, each of which is sealed with a first cover sheet 402, and the space between each first cuvette 401 and the first cover sheet 402 is filled with a negative electrode standard solution.

[0038] Example 3

[0039] On the basis of Example 2, the present embodiment provides a real-time measurement device for the valence state of the electrolyte of an all-vanadium redox flow battery, such as Figure 1 As shown, it includes a negative electrode electrolyte storage tank 1, a battery stack 5 is provided on one side of the negative electrode electrolyte storage tank 1, the negative electrode electrolyte storage tank 1 and the battery stack 5 are connected through a pipeline via a negative electrode magnetic pump 2 to form a circulation loop, and a positive electrode electrolyte storage tank 7 is provided on the other side of the battery stack 5. The positive electrode electrolyte storage tank 7 and the battery stack 5 are connected through a pipeline via a positive electrode magnetic pump 8 to form a circulation loop, and the side wall of the negative electrode electrolyte storage tank 1 is connected to a negative electrode connector 3 through a pipeline, as shown Figure 2As shown, the negative electrode communication tube 3 is connected to a negative electrode standard solution colorimetric card 4, which is a colorimetric card for divalent to tetravalent electrolytes. The side wall of the positive electrode electrolyte storage tank 7 is connected to a positive electrode communication tube 9 via a pipe. The positive electrode communication tube 9 is connected to a positive electrode standard solution colorimetric card 10, which is a colorimetric card for trivalent to pentavalent electrolytes. The negative electrode magnetic pump 2 is set on the pipe at the bottom of the negative electrode electrolyte storage tank 1, and the positive electrode magnetic pump 8 is set on the pipe at the bottom of the positive electrode electrolyte storage tank 7. A reference cell 6 is connected between the pipe at the bottom of the negative electrode electrolyte storage tank 1 and the pipe at the bottom of the positive electrode electrolyte storage tank 7. The reference cell 6 is connected in parallel with the battery stack 5.

[0040] like Figure 3 As shown, the negative electrode feed-through 3 includes a third cuvette 303, with a third cover sheet 304 provided on one side of the third cuvette 303. The edges of the third cuvette 303 and the third cover sheet 304 are glued together to form a rectangular, thin, hollow structure. Small holes are provided at both ends of the negative electrode feed-through 3. A first connecting tube 301 is provided between the negative electrode feed-through 3 and the negative electrolyte storage tank 1. The first connecting tube 301 passes through the small holes and connects to the negative electrode feed-through 3. A first fixing bracket 302 is provided on one side of the negative electrode feed-through 3 and the negative electrode standard solution colorimetric card 4. The first fixing bracket 302 has a groove, and the negative electrode feed-through 3 and the negative electrode standard solution colorimetric card 4 engage within the groove of the first fixing bracket 302.

[0041] like Figure 4 As shown, the negative electrode standard solution colorimetric card 4 includes several first standard colorimetric card units 403, each of which is provided with a first cuvette 401 at the bottom, each of which is sealed with a first cover sheet 402, and the space between each first cuvette 401 and the first cover sheet 402 is filled with a negative electrode standard solution.

[0042] like Figure 5 As shown, the positive electrode feedthrough 9 includes a fourth cuvette 903, with a fourth cover sheet 904 provided on one side of the fourth cuvette 903. The edges of the fourth cuvette 903 and the fourth cover sheet 904 are glued together to form a rectangular, thin, hollow structure. Small holes are provided at both ends of the positive electrode feedthrough 9. A second connecting tube 901 is provided between the positive electrode feedthrough 9 and the positive electrode electrolyte storage tank 7. The second connecting tube 901 passes through the small holes and connects to the positive electrode electrolyte storage tank 7. A second fixing bracket 902 is provided on one side of the positive electrode feedthrough 9 and the positive electrode standard solution colorimetric card 10. The second fixing bracket 902 has a groove, and the positive electrode feedthrough 9 and the positive electrode standard solution colorimetric card 10 are engaged in the groove of the second fixing bracket 902.

[0043] like Figure 6As shown, the cathode standard solution colorimetric card 10 includes several second standard colorimetric card units 1003, each of which has a second cuvette 1001 at the bottom, and each second cuvette 1001 is sealed with a second cover 1002, and the space between each second cuvette 1001 and the second cover 1002 is filled with cathode standard solution.

[0044] The working principle of the utility model of the real-time measurement device for the valence state of the electrolyte of the all-vanadium liquid flow battery is as follows: the electrolyte solution in the positive and negative electrolyte storage tanks enters the electrolyte delivery pipeline respectively through the positive and negative magnetic pumps, and then enters the reference battery and the battery stack respectively to perform redox reactions, and the electrical energy is stored in the electrolyte. The connecting tubes on the positive and negative storage tanks can be used to view the color of the electrolyte in the storage tanks in real time. Because the colors of electrolytes with different valence states are different, the current valence state of the electrolyte can be intuitively measured by comparing the connecting tube with the standard solution colorimetric card. Compared with the titration experiment, the real-time valence state can be estimated more quickly, the number of liquid extractions can be reduced, the risk of chemical burns is reduced, the test process is simplified, and the work efficiency is improved.

Claims

1. A real-time measurement device for the valence state of an all-vanadium redox flow battery electrolyte, characterized in that: The invention comprises a negative electrode electrolyte storage tank (1), a battery stack (5) is provided on one side of the negative electrode electrolyte storage tank (1), the negative electrode electrolyte storage tank (1) and the battery stack (5) are connected via a pipeline through a negative electrode magnetic pump (2) to form a circulation loop, a positive electrode electrolyte storage tank (7) is provided on the other side of the battery stack (5), the positive electrode electrolyte storage tank (7) and the battery stack (5) are connected via a pipeline through a positive electrode magnetic pump (8) to form a circulation loop, a negative electrode communication vessel (3) is connected to the side wall of the negative electrode electrolyte storage tank (1) via a pipeline, the negative electrode communication vessel (3) is connected to a negative electrode standard solution colorimetric card (4), and a positive electrode communication vessel (9) is connected to the side wall of the positive electrode electrolyte storage tank (7) via a pipeline, and the positive electrode communication vessel (9) is connected to a positive electrode standard solution colorimetric card (10).

2. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 1, characterized in that: The negative pole magnetic pump (2) is arranged on a pipe at the bottom of the negative pole electrolyte storage tank (1), and the positive pole magnetic pump (8) is arranged on a pipe at the bottom of the positive pole electrolyte storage tank (7).

3. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 1, characterized in that: A reference cell (6) is connected between the pipe at the bottom of the negative electrode electrolyte storage tank (1) and the pipe at the bottom of the positive electrode electrolyte storage tank (7), and the reference cell (6) is connected in parallel with the battery stack (5).

4. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 3, characterized in that: The negative electrode standard solution colorimetric card (4) comprises a plurality of first standard colorimetric card units (403), each of the first standard colorimetric card units (403) is provided with a first cuvette (401) at the bottom, each of the first cuvettes (401) is glue-sealed with a first cover sheet (402), and the space between each of the first cuvettes (401) and the first cover sheet (402) is filled with a negative electrode standard solution.

5. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 3, characterized in that: The cathode standard solution colorimetric card (10) comprises a plurality of second standard colorimetric card units (1003), each of the second standard colorimetric card units (1003) having a second cuvette (1001) at the bottom, each of the second cuvettes (1001) being glue-sealed with a second cover sheet (1002), and a cathode standard solution being filled between each of the second cuvettes (1001) and the second cover sheet (1002).

6. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 1, characterized in that: The negative electrode communicating vessel (3) includes a third cuvette (303), a third cover sheet (304) is provided on one side of the third cuvette (303), and the edges of the third cuvette (303) and the third cover sheet (304) are glued together to form a rectangular hollow structure; the positive electrode communicating vessel (9) includes a fourth cuvette (903), a fourth cover sheet (904) is provided on one side of the fourth cuvette (903), and the edges of the fourth cuvette (903) and the fourth cover sheet (904) are glued together to form a rectangular hollow structure.

7. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 1, characterized in that: Small holes are provided at both ends of the negative electrode connector (3), and a first connecting pipe (301) is provided between the negative electrode connector (3) and the negative electrode electrolyte storage tank (1), and the first connecting pipe (301) passes through the small holes and is connected to the negative electrode connector (3).

8. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 7, characterized in that: A first fixing bracket (302) is provided on one side of the negative electrode communicating vessel (3) and the negative electrode standard solution colorimetric card (4); the first fixing bracket (302) is provided with a groove; the negative electrode communicating vessel (3) and the negative electrode standard solution colorimetric card (4) are engaged in the groove of the first fixing bracket (302).

9. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 1, characterized in that: Small holes are provided at both ends of the positive electrode communicating vessel (9), a second connecting pipe (901) is provided between the positive electrode communicating vessel (9) and the positive electrode electrolyte storage tank (7), and the second connecting pipe (901) passes through the small holes and is connected to the positive electrode electrolyte storage tank (7).

10. The device for real-time measurement of electrolyte valence state of all-vanadium redox flow battery according to claim 9, characterized in that: A second fixing bracket (902) is provided on one side of the positive electrode communicating vessel (9) and the positive electrode standard solution colorimetric card (10), and the second fixing bracket (902) is provided with a groove, and the positive electrode communicating vessel (9) and the positive electrode standard solution colorimetric card (10) are engaged in the groove of the second fixing bracket (902).

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