Electrode frame for vanadium redox flow battery

Abstract

The utility model relates to an electrode frame for a vanadium redox flow battery, two partition parts are arranged in an electrode cavity, the two partition parts divide the electrode cavity into three sub-electrode cavities, and a plurality of avoiding channels communicated with the sub-electrode cavities are formed in the partition parts; a first sub-electrode cavity, a second sub-electrode cavity and a third sub-electrode cavity are sequentially arranged in the direction from the positive electrode liquid inlet to the positive electrode liquid outlet, a plurality of main flow channels communicated with the positive electrode liquid inlet and a first connecting channel communicated with the positive electrode liquid inlet are formed in the electrode frame main body, and the main flow channels are communicated with the first sub-electrode cavity; and one end, far away from the positive electrode liquid inlet, of the first connecting channel is communicated with the avoiding channel on the separation part close to the positive electrode liquid outlet. By adopting the technical scheme, the first connecting channel is designed for drainage, so that the electrolyte flow in the third sub-electrode cavity can be compensated. And the electrolyte flowing through the graphite felt electrode is more uniform.

Description

Technical Field

[0001] This application relates to the field of vanadium redox flow batteries, and particularly to an electrode frame for a vanadium redox flow battery. Background Art

[0002] The existing invention patent with the patent number CN108550885B discloses an electrode frame for an all-vanadium redox flow battery, which includes an electrode frame main body. An electrode cavity for placing electrodes is provided in the middle of the electrode frame main body. Positive liquid inlets, positive liquid outlets, negative liquid inlets, and negative liquid outlets are respectively provided at the four corners of the electrode frame main body. The positive liquid inlet and the positive liquid outlet are in a diagonal relationship, and the negative liquid inlet and the negative liquid outlet are in a diagonal relationship. The positive liquid inlet is sequentially connected with a positive liquid inlet main flow channel, a first positive liquid inlet shunt channel, and a positive liquid inlet sandwich flow channel located on the front of the electrode frame main body. The positive liquid outlet is sequentially connected with a positive liquid outlet main flow channel, a first positive liquid outlet shunt channel, and a positive liquid outlet sandwich flow channel located on the front of the electrode frame main body. An ion exchange membrane is provided on the back of the electrode frame main body. Sealing grooves are provided at the four peripheral edges of the positive liquid inlet, the positive liquid outlet, the electrode cavity, and the ion exchange membrane. Sealing strips are provided at the sealing grooves, and the ion exchange membrane is fixed around by the sealing strips.

[0003] Regarding the above related technologies, in a vanadium redox flow battery, the electrode is mainly a graphite felt. The utility model person believes that there is a defect that high-concentration electrolyte is likely to flow unevenly on the graphite felt. Utility Model Content

[0004] In order to make the electrolyte flow evenly through the graphite felt

[0005] An electrode frame for a vanadium redox flow battery provided by this application adopts the following technical solution:

[0006] An electrode frame for a vanadium redox flow battery includes an electrode frame main body. An electrode cavity for placing electrodes is provided in the middle of the electrode frame main body. The electrode frame main body is provided with a positive liquid inlet and a positive liquid outlet. The positive liquid inlet and the positive liquid outlet are in a diagonal relationship. It is characterized in that: two partition parts are arranged in the electrode cavity, and the two partition parts divide the electrode cavity into three sub-electrode cavities. A plurality of avoidance channels communicating with the sub-electrode cavities are opened on the partition parts; in the direction from the positive liquid inlet to the positive liquid outlet, there are a first sub-electrode cavity, a second sub-electrode cavity, and a third sub-electrode cavity in sequence. A plurality of main flow channels communicating with the positive liquid inlet and a first connection channel communicating with the positive liquid inlet are opened on the electrode frame main body. The plurality of main flow channels communicate with the first sub-electrode cavity, and one end of the first connection channel far from the positive liquid inlet communicates with an avoidance channel on the partition part close to the positive liquid outlet.

[0007] By adopting the above technical solution, a part of the high-concentration electrolyte enters the main flow channel from the positive electrode liquid inlet, and successively enters the first sub-electrode cavity, the second sub-electrode cavity, and the third sub-electrode cavity, and finally flows out through the positive electrode liquid outlet; another part of the high-concentration electrolyte directly enters the partition part near the third sub-electrode cavity through the first connection channel, and then enters the third sub-electrode cavity. The high-concentration electrolyte can enter the third sub-electrode cavity only after passing through the first and second sub-electrode cavities. Since the fluidity of the high-concentration electrolyte is poor, the flow rate of the high-concentration electrolyte entering the third sub-electrode cavity is small. Designing the first connection channel for drainage can compensate for the electrolyte flow rate in the third sub-electrode cavity, making the electrolyte flowing through the graphite felt electrode more uniform.

[0008] Preferably, a plurality of first diversion channels communicating with the first connection channel are opened on the main body of the electrode frame, and the plurality of first diversion channels communicate with the second sub-electrode cavity.

[0009] By adopting the above technical solution, part of the electrolyte enters the second sub-electrode cavity through the first diversion channel to average the electrolyte between the first sub-electrode cavity and the second sub-electrode cavity.

[0010] Preferably, a second connection channel is opened on the main body of the electrode frame. One end of the second connection channel communicates with the avoidance channel on the partition part near the positive electrode liquid inlet, and the other end communicates with the third sub-electrode cavity.

[0011] By adopting the above technical solution, part of the electrolyte in the second sub-electrode cavity enters the third sub-electrode cavity through the second connection channel to average the electrolyte between the second sub-electrode cavity and the third sub-electrode cavity.

[0012] Preferably, a plurality of second diversion channels communicating with the second sub-electrode cavity and a plurality of third diversion channels communicating with the third sub-electrode cavity are opened on the main body of the electrode frame. The plurality of first diversion channels and the plurality of second diversion channels are respectively located on both sides of the second sub-electrode cavity; the plurality of second diversion channels and the third diversion channels communicate with the second connection channel.

[0013] By adopting the above technical solution, part of the electrolyte enters the third sub-electrode cavity from the second sub-electrode cavity through the second diversion channel and the third diversion channel to average the electrolyte between the second sub-electrode cavity and the third sub-electrode cavity.

[0014] Preferably, a platform area for supporting the electrode is provided on the partition part, and an avoidance groove for passing the electrolyte is provided on the back of the platform area.

[0015] By adopting the above technical solution, the platform area is used to place the graphite felt, and the avoidance groove is used to pass the electrolyte.

[0016] Preferably, the two platform areas of the two partition parts are far away from each other.

[0017] By adopting the above technical solution, the platform area is symmetrically arranged, making the electrolyte concentrations on both sides of the graphite felt close to each other.

[0018] Preferably, several of the main channels are arranged in a linear array, and the straight line is perpendicular to the electrolyte inlet direction and has a length equal to the side length of the first sub-electrode cavity close to the positive electrode inlet.

[0019] By adopting the above technical solution, the electrolyte enters different main channels respectively and then enters the first sub-electrode cavity through the main channels. Since there are main channels corresponding to the entire length direction of the first sub-electrode cavity, the distribution of the electrolyte in the first sub-electrode cavity is relatively uniform.

[0020] Preferably, several fourth shunt channels communicating with the first sub-electrode cavity are provided on the electrode frame body, and the fourth shunt channels communicate with the first connecting channel.

[0021] By adopting the above technical solution, the electrolyte enters the first sub-electrode cavity through the fourth shunt channels, and the flow rate of the electrolyte entering the first sub-electrode cavity increases.

[0022] Preferably, a buffer area is further provided between the positive electrode inlet and the main channel.

[0023] By adopting the above technical solution, the electrolyte passes through the buffer area before entering the main channel. The electrolyte spreads on the buffer area, making the electrolyte enter different main channels evenly, and further making the electrolyte enter the first sub-electrode cavity more evenly.

[0024] Preferably, the upper surface of the buffer area is a plane.

[0025] By adopting the above technical solution, the electrolyte spreads relatively evenly on the plane.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] Part of the electrolyte passes through the main channel → the first sub-electrode cavity → the second sub-electrode cavity → the third sub-electrode cavity and is discharged from the positive electrode outlet; another part of the electrolyte flows out through the first connecting channel → the avoidance channel → the third electrode cavity; designing the first connecting channel for drainage can compensate the electrolyte flow rate in the third sub-electrode cavity, making the electrolyte flowing through the graphite felt electrode more uniform.

[0028] The electrolyte in the second sub-electrode cavity enters the third electrode cavity through the third shunt channel → the second connecting channel → the fourth shunt channel, making the electrolyte distribution in the second sub-electrode cavity and the third sub-electrode cavity more uniform. Description of the Drawings

[0029] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the front structure of an embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the back structure of an embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the side structure of an embodiment of the present application.

[0033] Explanation of reference numerals: 1, electrode frame body; 2, positive liquid inlet; 3, positive liquid outlet; 4, partition part; 41, avoidance channel; 42, platform area; 43, avoidance groove; 5, main flow channel; 6, first shunt channel; 7, second shunt channel; 8, third shunt channel; 9, fourth shunt channel; 10, first connection channel; 11, first sub-electrode cavity; 12, second sub-electrode cavity; 13, third sub-electrode cavity; 14, buffer area; 15, second connection channel; 16, upper part; 17, upper connection part; 18, middle part; 19, lower connection part; 20, lower part; 21, liquid infusion channel; 22, liquid seepage port. Detailed implementation manners

[0034] The following further elaborates on the present application in conjunction with the attached Figures 1-4 for a more detailed description.

[0035] An embodiment of the present application discloses an electrode frame for a vanadium redox flow battery.

[0036] Referring to Figure 1 , an electrode frame for a vanadium redox flow battery includes a cuboid-shaped electrode frame body 1. A square electrode cavity is formed on the main body of the electrode frame. Two parallel partition parts 4 are arranged in the electrode cavity. The partition part 4 divides the electrode cavity into three sub-electrode cavities, which are the first sub-electrode cavity 11, the second sub-electrode cavity 12, and the third sub-electrode cavity 13 from bottom to top respectively.

[0037] Referring to Figure 1 and Figure 2 , the partition part 4 is a plate-like structure. The partition part 4 is mainly composed of two parts. One part is a cuboid-shaped platform area 42, and the other part is a liquid flow area. A number of protrusions are arranged on the upper surface of the liquid flow area, and avoidance channels 41 are formed between the protrusions. The platform area 42 accounts for one-fourth of the length of the entire partition part 4. A notch is formed on the back of the platform area 42 to form an avoidance groove 43 for passing electrolyte. The two platform areas 42 are arranged diagonally, and the platform areas 42 are both connected to the electrode frame body 1.

[0038] Referring to Figure 2 , Figure 3, at the diagonal corners of the electrode frame body 1, a positive electrode liquid inlet 2 and a positive electrode liquid outlet 3 are respectively provided. When observing from the front of the electrode frame, the positive electrode liquid inlet 2 is located at the lower right corner of the electrode frame body 1, and the positive electrode liquid outlet 3 is located at the upper left corner of the electrode frame body 1. On the back of the electrode frame body 1, a serpentine liquid channel 21 that does not penetrate the thickness of the electrode frame body 1 is provided. The starting end of the liquid channel 21 is connected to the positive electrode liquid inlet 2. The electrode frame body 1 is provided with a buffer area 14 close to the first sub-electrode cavity 11, and the upper surface of the buffer area 14 is a smooth plane. Between the buffer area 14 and the first sub-electrode cavity 11, a number of protrusions are provided. The number of protrusions is linearly arrayed along the length direction of the buffer area 14. A main flow channel 5 for flowing electrolyte is formed between two protrusions. The array of protrusions starts from the left side of the buffer area 14 and ends at the right side of the buffer area 14.

[0039] Reference Figure 2 , Figure 3 , the end of the liquid channel 21 is connected to a liquid seepage port 22. The liquid seepage port 22 is located on the buffer area 14. The liquid seepage port 22 is rectangular and penetrates the thickness direction of the electrode frame body 1.

[0040] Reference Figure 1 , Figure 2 , on the right side of the electrode frame, a first connection channel 10 is provided. The starting end of the first connection channel 10 is connected to the buffer area 14, and the other end of the first connection channel 10 is connected to an avoidance channel 41 on the upper partition 4. On the plane on the right side of the first sub-electrode cavity 11 and the second sub-electrode cavity 12, a number of protrusions are provided. The channels formed between adjacent two protrusions are respectively a first shunt channel 6 and a fourth shunt channel 9. Both the first shunt channel 6 and the fourth shunt channel 9 are connected to the first connection channel 10.

[0041] Reference Figure 1 , Figure 2 , on the left side of the electrode frame, a second connection channel 15 is provided. The starting end of the second connection channel 15 is connected to the avoidance channel 41 on the lower partition 4, and the other end of the second connection channel 15 is connected to the third sub-electrode cavity 13. On the platform on the left side of the second sub-electrode cavity 12 and the third sub-electrode cavity 13, a number of protrusions are provided. The channels formed between adjacent two protrusions are respectively a second shunt channel 7 and a third shunt channel 8. The second shunt channel 7 and the third shunt channel 8 are connected to the second connection channel 15.

[0042] Reference Figure 2 , Figure 4 , the graphite felt matched with the above electrode frame includes an upper part 16, an upper connection part 17, a middle part 18; a lower connection part 19, a lower part 20. The lower part 20 is located in the first sub-electrode cavity 11, the lower connection part 19 is placed on the platform area 42 of the lower partition 4, the middle part 18 is located in the second sub-electrode cavity 12, the upper connection part 17 is placed on the platform of the upper partition 4, and the upper part 16 is located in the third sub-electrode cavity 13.

[0043] The implementation principle of an electrode frame for a vanadium redox flow battery in an embodiment of this application is as follows:

[0044] I. The graphite felt electrode is placed in the electrode frame body 1.

[0045] II. The electrolyte enters through the positive electrode liquid inlet 2, passes through the liquid delivery channel 21, and flows into the buffer area 14 through the liquid seepage port 22.

[0046] III. After the electrolyte enters the buffer area 14, it starts to split. Part of the liquid enters the first sub-electrode cavity 11 through the main flow channel 5, and the other part passes through the first connection channel 10.

[0047] IV. The electrolyte that enters the first connection channel 10 starts to split again. Part of the liquid enters the second sub-electrode cavity 12 through the first split flow channel 6, another part enters the first sub-electrode cavity 11 through the fourth split flow channel 9, and still another part directly enters the avoidance channel 41 on the upper partition part 4 and then enters the third sub-electrode cavity 13.

[0048] V. Part of the electrolyte in the first sub-electrode cavity 11 enters the second sub-electrode cavity 12 through the avoidance channel 41 on the lower partition part 4, and part enters the second sub-electrode cavity 12 through the avoidance groove 43.

[0049] VI. Part of the electrolyte in the avoidance channel 41 on the lower partition part 4 enters the second connection channel 15. The electrolyte in the second connection channel 15 enters the third sub-electrode cavity 13 through the third split flow channel 8, the second connection channel 15, and the fourth split flow channel 9.

[0050] VII. The electrolyte in the third sub-electrode cavity 13 flows out through the upper main flow channel 5 and out through the positive electrode liquid outlet 3.

[0051] The above are all preferred embodiments of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An electrode frame for a vanadium redox flow battery, comprising an electrode frame body (1). An electrode cavity for placing electrodes is provided in the middle of the electrode frame body (1). The electrode frame body (1) is provided with a positive electrode inlet (2) and a positive electrode outlet (3). The positive electrode inlet (2) and the positive electrode outlet (3) are in a diagonal relationship. It is characterized in that: There are two partition parts (4) arranged in the electrode cavity. The two partition parts (4) divide the electrode cavity into three sub-electrode cavities. A number of avoidance channels (41) communicating with the sub-electrode cavities are formed on the partition parts (4). In the direction from the positive liquid inlet (2) to the positive liquid outlet (3), there are a first sub-electrode cavity (11), a second sub-electrode cavity (12), and a third sub-electrode cavity (13) in sequence. A number of main channels (5) communicating with the positive liquid inlet (2) and a first connecting channel (10) communicating with the positive liquid inlet (2) are formed on the electrode frame body (1). The number of main channels (5) communicates with the first sub-electrode cavity (11). One end of the first connecting channel (10) far from the positive liquid inlet (2) communicates with the avoidance channel (41) on the partition part (4) close to the positive liquid outlet (3).

2. The electrode frame for a vanadium redox flow battery according to claim 1, characterized in that: A number of first shunt channels (6) communicating with the first connecting channel (10) are formed on the electrode frame body (1). The number of first shunt channels (6) communicates with the second sub-electrode cavity (12).

3. The electrode frame for a vanadium redox flow battery according to claim 2, characterized in that: A second connecting channel (15) is formed on the electrode frame body (1). One end of the second connecting channel (15) communicates with the avoidance channel (41) on the partition part (4) close to the positive liquid inlet, and the other end communicates with the third sub-electrode cavity (13).

4. The electrode frame for a vanadium redox flow battery according to claim 3, characterized in that: A number of second shunt channels (7) communicating with the second sub-electrode cavity (12) and a number of third shunt channels (8) communicating with the third sub-electrode cavity (13) are formed on the electrode frame body (1). The number of first shunt channels (6) and the number of second shunt channels (7) are respectively located on both sides of the second sub-electrode cavity (12). The number of second shunt channels (7) and the third shunt channels (8) communicate with the second connecting channel (15).

5. The electrode frame for a vanadium redox flow battery according to claim 4, characterized in that: A platform area (42) for supporting the electrode is arranged on the partition part (4). An avoidance groove (43) for passing the electrolyte is arranged on the back surface of the platform area (42).

6. The electrode frame for a vanadium redox flow battery according to claim 5, characterized in that: The two platform areas (42) of the two partition parts (4) are far away from each other.

7. The electrode frame for a vanadium redox flow battery according to claim 6, characterized in that: The number of main channels (5) is arranged in a linear array. This line is perpendicular to the electrolyte inlet direction and its length is equal to the side length of the first sub-electrode cavity (11) close to the positive liquid inlet (2).

8. The electrode frame for a vanadium redox flow battery according to claim 7, characterized in that: A number of fourth shunt channels (9) communicating with the first sub-electrode cavity (11) are formed on the electrode frame body (1). The fourth shunt channels (9) communicate with the first connecting channel (10).

9. The electrode frame for a vanadium redox flow battery according to claim 8, wherein: It further includes a buffer area (14) arranged between the positive liquid inlet (2) and the main channels (5).

10. The electrode frame for a vanadium redox flow battery according to claim 9, characterized in that: The upper surface of the buffer area (14) is a plane.

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