An electrode frame assembly for vanadium liquid flow battery

Abstract

The present application relates to the field of electrode frames, and in particular to an electrode frame assembly for a vanadium liquid flow battery, which includes an electrode frame; the electrode frame is provided with an avoidance groove, and the electrode frame is provided with multiple liquid inlets connected to the avoidance groove and liquid outlets corresponding to the liquid inlets; it also includes a buffer connected to the liquid inlet and the infusion port respectively, the electrode frame is located between the two buffers, and a plurality of parallel flow channels are arranged in the buffer, and the plurality of flow channels are respectively connected to the liquid inlet or the liquid outlet, so that the flow channels and the electrode frame are separated and placed outside the battery stack, so that the flow channels or the electrode frame can be replaced or repaired in the battery stack, and at the same time, not providing flow channels on the electrode frame can reduce the thickness of the electrode frame.

Description

Technical Field

[0001] The present application relates to the technical field of liquid flow battery electrode frames, and in particular to an electrode frame assembly for a vanadium liquid flow battery. Background Art

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

[0003] The existing Chinese invention patent with publication number CN116014200B discloses a high-power density liquid flow battery positive and negative electrode frame integrated flow field structure, which includes an electrode frame body, a flow channel cover plate, a frame cover plate, and a bipolar plate. A common flow channel for positive and negative electrolytes is set on the electrode frame body, and positive and negative electrolyte distribution main channels connected to the common flow channel for positive and negative electrolytes are respectively set on both sides of the electrode frame body. Electrolyte distribution branch flow channels and electrolyte distribution ports are set on one side of the flow channel cover plate, and the bipolar plate is embedded in the electrode frame body. For the above-mentioned related technologies, the flow channel is set on the surface of the electrode frame and the electrode frame is clamped in the battery stack. The electrode frame includes a flow channel, a reaction zone, etc. When the flow channel or reaction zone of the battery stack fails, it needs to be dismantled and replaced as a whole, and the maintenance process is complicated and costly; when the flow channel or reaction zone on the electrode frame needs to be improved, it needs to be designed and manufactured as a whole, and the design is difficult; the area of ​​the reaction zone on the electrode frame accounts for a low proportion, which is not conducive to further improving the battery power. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the present application provides an electrode frame assembly for a vanadium liquid flow battery, comprising an electrode frame; the electrode frame is provided with an avoidance hole, and the electrode frame is provided with multiple liquid inlets connected to the avoidance hole and liquid outlets corresponding to the liquid inlets; it also includes a buffer connected to the liquid inlet and the infusion port respectively, the electrode frame is located between the two buffers, and a plurality of parallel flow channels are arranged in the buffer, and the plurality of flow channels are respectively connected to the liquid inlet or the liquid outlet.

[0005] Optionally, the buffer includes a buffer plate, the flow channel is an infusion groove opened in the buffer plate, the infusion groove meanders multiple times in a plane, and several infusion grooves have the same length; the buffer plate and the electrode frame are detachably connected.

[0006] Optionally, the buffer plate is in a rectangular shape, and four infusion grooves are provided in the buffer plate. The four infusion grooves are evenly divided into two groups, and the two groups of infusion grooves are symmetrical about the symmetry axis of the buffer plate.

[0007] Optionally, the two infusion tanks in each group are centrally symmetrical about the area they occupy.

[0008] Optionally, the two infusion tanks in each group are arranged axially symmetrically in the area they occupy.

[0009] Optionally, the buffer includes two buffer plates pressed against each other, the buffer plates are in the shape of a rectangular parallelepiped, and two infusion grooves are arranged on each layer of the buffer plates. The two infusion grooves on the same buffer plate are symmetrical about the symmetry axis of the buffer plate, and the two corresponding infusion grooves on different buffer plates are centrally symmetrical on the areas they occupy.

[0010] Optionally, the buffer includes four layers of buffer plates, the buffer plates are rectangular, each buffer plate is provided with an infusion groove, the two infusion grooves on the two outermost buffer plates are symmetrical about the symmetry axis of the buffer plates, and the two infusion grooves on the two middle buffer plates are symmetrical about the symmetry axis of the buffer plates.

[0011] Optionally, the buffer includes multiple infusion tubes connected to the liquid inlet or outlet, a fixed column for winding the infusion tubes, and a sealing cylinder surrounding the outside of the infusion tubes and the fixed column, forming a closed cavity between the sealing cylinder and the fixed column, and an inlet valve for the entry of cooling liquid and an outlet valve for draining the cooling liquid are installed on the outside of the sealing cylinder, and the infusion tube and the electrode frame are detachably connected.

[0012] Optionally, the buffer includes a plurality of fixed columns and sealing cylinders, the number of the fixed columns and the sealing cylinders is the same as the number of the infusion tubes, and the fixed columns are respectively wound around different fixed columns.

[0013] Optionally, the buffer includes only one fixed column and one sealing cylinder, and a plurality of infusion tubes are wound around the fixed column.

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

[0015] 1. Reduce maintenance costs: The modular design makes maintenance easier. Since the flow channel and the electrode frame are separated, only the damaged part needs to be repaired, which effectively reduces the maintenance cost.

[0016] 2. Improve the flexibility of flow channel design: The flow channel is set outside the battery stack, which has a larger accommodation space. The design of the electrode frame can be independently divided into an electrode module and a flow channel module, reducing the design and construction cost and difficulty.

[0017] 3. Improve the charging and discharging efficiency of the battery: There is no need to open a flow channel on the electrode frame. The electrode frame of the same area can open a larger avoidance hole to place a larger graphite felt electrode, which effectively improves the power of the battery.

[0018] 4. Reduce the difficulty of testing and debugging: Each module can be tested and debugged individually, which can detect and solve problems earlier and improve the quality and stability of the vanadium battery system.

[0019] 5. Cool down the battery branch: After the flow channel is externalized, the temperature of the flow channel can be controlled to improve the reaction efficiency of the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0021] Figure 2 It is a partial structural diagram of Example 1 of the present application.

[0022] Figure 3 yes Figure 2 Enlarged view of part A.

[0023] Figure 4 It is a partial structural diagram of Example 2 of the present application.

[0024] Figure 5 It is a partial structural diagram of Example 3 of the present application.

[0025] Figure 6 It is a partial structural diagram of Example 4 of the present application.

[0026] Figure 7 It is a schematic diagram of the overall structure of Example 5 of the present application.

[0027] Figure 8 It is a partial structural diagram of Example 5 of the present application.

[0028] Fig. 9 It is a partial structural diagram of Example 6 of the present application.

[0029] Explanation of the reference numerals: 1. electrode frame; 11. avoidance hole; 12. liquid inlet; 2. buffer plate; 21. infusion tank; 31. sealing cylinder; 32. liquid inlet valve; 33. fixing column; 34. infusion tube; 35. sealing chamber; 36. liquid outlet valve; 4. graphite felt; 5. plastic tube; 6. threaded joint; 7. positive electrode liquid inlet main line; 8. negative electrode liquid inlet main line; 9. end plate; 10. placement box; 101. placement tank. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-Figure 9 This application is described in further detail.

[0031] Example 1

[0032] Reference Figure 1 An electrode frame assembly for a vanadium liquid flow battery includes two buffer plates 2, an electrode frame 1 located between the two buffer plates 2, a plastic pipe 5 for connecting the electrode frame 1 and the buffer plates 2, and a placement box 10 for placing the buffer plates 2.

[0033] refer to Figure 2 , Figure 3 The electrode frame 1 is in a rectangular shape, and a avoidance hole 11 that penetrates the thickness of the electrode frame 1 is provided at the center of the electrode frame 1. Four liquid inlets 12 are provided on the upper end surface of the electrode frame 1. The cross section of the liquid inlet 12 is circular, and the four liquid inlets 12 are arranged at equal intervals. Four liquid outlets are provided on the lower end surface of the electrode frame 1. The four liquid outlets correspond to the four liquid inlets 12 one by one. The corresponding liquid outlets and liquid inlets 12 have the same axis. The liquid outlets and liquid inlets 12 are connected to the avoidance hole 11, and the avoidance hole 11 is used to embed the graphite felt 4. The graphite felt 4, the bipolar plate, the electrode frame 1 and the proton exchange membrane are clamped between the two end plates 9.

[0034] refer to Figure 2 , Figure 3 , threaded joints 6 are installed at both ends of the plastic tube 5, and the threaded joints 6 are respectively threadedly connected with the electrode frame 1 and the buffer plate 2. The buffer plate 2 is made of corrosion-resistant flexible plastic, such as PE, PP, etc.

[0035] refer to Figure 2 , the buffer plate 2 is provided with four infusion grooves 21 serpentine in the same plane. The buffer plate 2 is divided into two parts along the center line, two infusion grooves 21 are distributed in the left half, and the other two infusion grooves 21 are distributed in the right half. The two infusion grooves 21 on the left half and the two infusion grooves 21 on the right half are symmetrical about the center line. Since the buffer plate 2 is rectangular, the left half and the right half are both rectangular. The two infusion grooves 21 on the left are symmetrical about the center of the left half. Similarly, the two infusion grooves 21 on the right are symmetrical about the center of the right half.

[0036] refer to Figure 1 , Figure 2 , four plastic tubes 5 connected to the same buffer plate 2 are connected to the positive electrode liquid inlet trunk 7, and the plastic tube 5 is detachably connected to the buffer plate 2, and the adjacent buffer plate 2 is connected to the negative electrode liquid inlet trunk 8 through the plastic tube 5. The lower buffer plate 2 is connected to the positive electrode liquid outlet trunk and the negative electrode liquid outlet trunk in the same way.

[0037] refer to Figure 1The placement box 10 includes a placement slot for placing the buffer plate 2, and the buffer plate 2 can be inserted into the placement slot 101. The placement box 10 is made of hard material, such as PVC board, plastic-sealed steel plate, tempered glass, etc.

[0038] The implementation principle of the electrode frame assembly for a vanadium liquid flow battery in the embodiment of the present application is as follows: the electrolyte in the positive electrode storage tank enters the positive electrode liquid inlet 12 trunk under the action of the water pump, and is then distributed to the four plastic tubes 5, and enters the graphite felt 4 electrode along the four infusion grooves 21, and then flows back to the positive electrode storage tank through the lower plastic tube 5, the buffer plate 2 and the positive electrode liquid outlet trunk. The electrolyte in the negative electrode storage tank flows in the same way. The buffer plate 2 is placed in the placement slot 101. When the buffer plate 2 fails or needs to be replaced, the buffer plate 2 is taken out for replacement or repair.

[0039] Example 2

[0040] refer to Figure 4 , the difference between Example 2 and Example 1 is that the buffer of this embodiment includes two buffer plates 2, one of which is provided with an infusion groove 21 inside, and the other buffer plate 2 is provided with an infusion groove 21 on the surface, and the buffer plate 2 with the infusion groove 21 on the surface is pressed against the other buffer plate 2. The cross-sectional areas of the infusion grooves 21 on the two buffer plates 2 are the same. Two infusion grooves 21 are provided on each buffer plate 2, and the buffer plate 2 is equally divided into left and right parts, and the two infusion grooves 21 respectively occupy the left half and the right half and are symmetrical about the symmetry axis of the buffer plate 2. The infusion grooves 21 corresponding to the front and rear of the two buffer plates 2 are centrally symmetrical, and the center of symmetry is the center of the left half or the right half. The two buffer plates 2 are bonded together by glue.

[0041] Example 3

[0042] refer to Figure 5 , The difference between Example 3 and Example 1: The arrangement of the flow channels of this embodiment. The buffer of this embodiment includes a buffer plate 2, and four infusion grooves 21 are opened in the buffer plate 2. The buffer plate 2 is evenly divided into four rectangular areas, and each infusion groove 21 is distributed in a rectangular area, and two adjacent infusion grooves 21 are axially symmetrically arranged.

[0043] Example 4

[0044] The buffer of this embodiment includes four buffer plates 2 pressed against each other in sequence, one of the buffer plates 2 having an infusion groove 21 formed inside, and the surfaces of the other three buffer plates 2 having infusion grooves 21 formed on their surfaces. The three buffer plates 2 having infusion grooves 21 formed on their surfaces are pressed against the end surfaces of the adjacent buffer plates 2 that do not have the infusion grooves 21 in sequence, and the adjacent buffer plates 2 are bonded together by glue.

[0045] Example 5

[0046] refer to Figure 7 , Figure 8 The electrode frame of the present application has the same structure as the electrode frame 1 in Example 1. The buffer includes five infusion tubes 34 connected to the electrode frame 1, five fixed columns 33, and a sealing tube 31 sleeved on the outside of the fixed columns 33. The sealing tube 31 and the fixed columns 33 are welded together, and a sealing cavity 35 is formed between the sealing tube 31 and the fixed shaft. The infusion tube 34 is partially wound around the fixed shaft and is located in the sealing cavity 35. Both ends of the infusion tube 34 are connected to the electrode frame 1 by threads.

[0047] refer to Figure 7 , Figure 8 A liquid inlet valve 32 and a liquid outlet valve 36 connected to the sealing chamber 35 are installed on the sealing cylinder 31. The liquid inlet valve 32 is located at the upper end of the sealing cylinder 31, and the liquid outlet valve 36 is located at the lower end of the sealing cylinder 31.

[0048] The implementation principle of the electrode frame assembly for a vanadium liquid flow battery in the embodiment of the present application is as follows: the coolant enters through the liquid inlet valve 32 to cool the electrolyte in the liquid infusion tube 34. After the cooling is completed, the liquid outlet valve 36 is opened to discharge the coolant.

[0049] Example 6

[0050] refer to Fig. 9 The difference between this embodiment and embodiment 5 is that the buffer only includes one fixed column 33 and one sealing tube 31, and five infusion tubes 34 are wound around one fixed column 33, and the five infusion tubes 34 are alternately wound and have the same length.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electrode frame assembly for a vanadium redox flow battery, characterized in that: The invention comprises an electrode frame (1); the electrode frame (1) is provided with an avoidance hole (11); the electrode frame (1) is provided with a plurality of liquid inlets (12) connected to the avoidance hole (11), and liquid outlets corresponding to the liquid inlets (12); and further comprises a buffer respectively connected to the liquid inlet (12) and the liquid outlet, the electrode frame (1) is located between the two buffers, a plurality of parallel flow channels are arranged in the buffer, and the plurality of flow channels are respectively connected to the liquid inlet (12) or the liquid outlet; the buffer comprises a plurality of parallel flow channels; A plurality of infusion tubes (34) passing through the inlet (12) or the outlet, a fixed column (33) for winding the infusion tubes (34), and a sealing cylinder (31) surrounding the outside of the infusion tubes (34) and the fixed column (33), wherein a closed cavity is formed between the sealing cylinder (31) and the fixed column (33), and an inlet valve (32) for the entry of cooling liquid and an outlet valve (36) for the discharge of cooling liquid are installed outside the sealing cylinder (31), and the infusion tube (34) and the electrode frame (1) are detachably connected.

2. The electrode frame assembly for vanadium redox flow battery according to claim 1, characterized in that: The buffer comprises a plurality of fixing columns (33) and sealing cylinders (31), the number of the fixing columns (33) and the sealing cylinders (31) being the same as the number of the infusion tubes (34), and the infusion tubes (34) are respectively wound around different fixing columns (33).

3. The electrode frame assembly for vanadium redox flow battery according to claim 1, characterized in that: The buffer comprises only one fixed column (33) and one sealing cylinder (31), and a plurality of liquid infusion tubes (34) are wound around the fixed column (33).

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