Device for preparing polar plate for vanadium redox flow battery and polar plate

Abstract

The utility model relates to the field of vanadium redox flow batteries, in particular to a device for preparing a polar plate for a vanadium redox flow battery and the polar plate, and the device comprises a supporting table, a coating mechanism mounted on the supporting table, and a pressing mechanism mounted on the supporting table; the coating mechanism comprises a coating, a plurality of supporting pieces used for supporting the coating to be wound in a snakelike mode, a driving shaft driving the coating to move and a coating shaft used for coating the coating. The coating supported by the supporting piece forms a plurality of accommodating spaces for placing raw material plates; the pressing mechanism comprises a lifting table and a pressing plate corresponding to the lifting table; the supporting piece is located between the lifting table and the pressing plate. Multiple raw material plates can be machined at a time, coating can be recycled, automatic feeding is achieved, and the working efficiency is improved; the conductive layer is formed on the polar plate and is in a grid shape, so that the contact area between the graphite felt and the polar plate is increased, and the contact resistance between the graphite felt and the polar plate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vanadium flow battery, in particular to a device for preparing an electrode plate for vanadium flow battery and the electrode plate. BACKGROUND

[0002] The all-vanadium redox flow battery is a kind of redox battery with vanadium as active substance in the form of circulating flow liquid. The vanadium battery stores electrical energy in the form of chemical energy in the sulfuric acid electrolyte of vanadium ions in different valence states. The electrolyte is pressed into the battery stack by an external pump, and circulates in the closed loop of different storage tanks and half cells under mechanical power. A proton exchange membrane is used as the separator of the battery pack. The electrolyte solution flows parallelly over the electrode surface and undergoes electrochemical reaction. The current is collected and conducted by the double electrode plate, so that the chemical energy stored in the solution is converted into electrical energy.

[0003] The vanadium battery mainly consists of electrolyte, electrode, selective proton exchange membrane, bipolar plate and current collector.

[0004] Reducing the battery resistance is an important challenge in developing vanadium flow battery. The vanadium battery operates by stacking electrodes, bipolar plates and membranes and other components. In particular, the contact resistance between the bipolar plate and the electrode needs to be minimized, as it will cause uneven charge distribution. SUMMARY

[0005] In order to reduce the contact resistance between the bipolar plate and the electrode, the device for preparing an electrode plate for vanadium flow battery and the electrode plate provided by the present application adopt the following technical solutions:

[0006] A device for preparing an electrode plate for vanadium flow battery, comprising a support table, a coating mechanism mounted on the support table, and a pressing mechanism mounted on the support table; the coating mechanism comprises a coating, a plurality of support members for supporting the coating in a serpentine winding, a drive shaft for moving the coating, and a coating shaft for applying coating to the coating; the coating supported by the support members forms a plurality of accommodation spaces for placing raw material plates; the pressing mechanism comprises a lifting table and a pressing plate corresponding to the lifting table; the support members are located between the lifting table and the pressing plate.

[0007] Optionally, the support member is a support shaft; the plurality of support shafts are divided into two rows, the distance between adjacent two support shafts in each row is equal to the diameter of the support shaft, and the projections of the two rows of support shafts on the symmetry plane are staggered and do not coincide.

[0008] Optionally, the cross section of the support shaft is: one rectangle with an arc connected to each side; the coating mechanism further comprises a first driving mechanism for driving the support shaft to rotate along its own axis, and a second driving mechanism for driving the support shafts to move closer to each other.

[0009] Optionally, the first driving mechanism is installed on a gear of the supporting shaft, a rack engaged with the gear, a sleeve for embedding the rack, and a cylinder for driving the rack to move; the cylinder and the sleeve are installed on the supporting table.

[0010] Optionally, the second driving mechanism comprises a mounting block for mounting the supporting shaft, a guide rail for embedding the mounting block, a threaded rod penetrating through the mounting block, and a first motor for driving the threaded rod to rotate; the first motor is installed on the guide rail; the cylinder and the guide rail are slidingly connected to the supporting table so that the rack and the gear are separated.

[0011] Optionally, the supporting member is a supporting plate, and a plurality of the supporting plates are arranged in parallel and at equal intervals.

[0012] Optionally, the device further comprises a feeding mechanism; the feeding mechanism comprises a feeding frame slidingly connected to the supporting table, a plurality of feeding plates installed on the feeding frame, and heating wires embedded on the feeding plates; the feeding frame comprises a sliding rail and a mounting plate perpendicular to the sliding rail; a sliding groove is formed on the mounting plate; a sliding block slidingly connected to the sliding groove is fixedly connected to the feeding plate; a spring is arranged between adjacent sliding blocks and embedded in the sliding groove.

[0013] Optionally, a clamping groove for embedding a raw material plate is formed at an upper end of the feeding plate, and the heating wire is embedded in the clamping groove.

[0014] A coating for a device for preparing an electrode plate for a vanadium flow battery, and a preparation method, comprising: uniformly dispersing 1 part by mass of carbon nanotubes, 10-15 parts by mass of acetone, 20-30 parts by mass of water, and 0.1-0.3 parts by mass of polyvinylpyrrolidone at high speed, and deaerating under negative pressure to form A liquid; dissolving 0.3-0.6 parts by mass of cumene hydroperoxide in 5-10 parts by mass of ethanol to form B liquid; when used, B liquid is coated on the surface of the electrode plate in an amount of 0.01 g / cm 2 , and then A liquid is printed on one side of the electrode plate sprayed with B liquid in an amount of 0.05 g / cm 2 .

[0015] An electrode plate prepared by using a device for preparing an electrode plate for a vanadium flow battery, the electrode plate comprising a raw material plate and a reticular conductive layer combined with the raw material plate, the conductive layer having a mesh number of 300-400.

[0016] In summary, the present application has at least one of the following beneficial technical effects:

[0017] The coating and raw material plate are pressed between the pressing plate and the lifting platform by the cooperation of the driving shaft and the coating shaft, and a plurality of raw material plates are inserted into the corresponding accommodation spaces at a time; the pressing mechanism is started; the coating and the raw material plate are pressed between the pressing plate and the lifting platform; a plurality of raw material plates can be coated and pressed at the same time; the coating can be recycled and automatically fed, and the working efficiency is improved.

[0018] The support shaft section is a rectangle, and two sides are connected with an arc respectively; and the first driving mechanism and the second driving mechanism are installed, when the raw material plates are inserted between the support shafts, the support shafts are in vertical state, the containing space is large, when the raw material plates enter into the containing space, the support shafts are rotated to be in horizontal state, then the support shafts are close to each other, the containing space is small, at this time, the raw material plates are compressed and coated, the deformation of the coated raw material plates is small, and the raw material plates are not easy to be pulled or even torn, and the lines on the raw material plates are more uniform.

[0019] The device is provided with a feeding mechanism, and a plurality of raw material plates can be fed at a time by only pushing the feeding frame, so that the efficiency is improved; meanwhile, the raw material plates are clamped in the clamping grooves, and the raw material plates can be directly taken out after processing, so that the working efficiency is improved.

[0020] The cumene hydroperoxide in the B liquid can oxidize the surface of the polar plate, and combine with the functional carbon material in the polar plate through π-π interaction, so that the A liquid can be more uniformly dispersed on the surface of the polar plate. Meanwhile, the acetone in the A liquid can dissolve a part of the surface of the polar plate, and after heat pressing, the surface of the polar plate forms a grid-shaped conductive layer, so that the contact area between the graphite felt and the polar plate is increased, and the contact resistance between the two is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the application.

[0022] Figure 2 is a schematic diagram of the coating mechanism of embodiment 1 of the application.

[0023] Figure 3 is a schematic diagram of part of the structure of embodiment 1 of the application.

[0024] Figure 4 is Figure 3 is a partial enlarged view of part A in FIG. 6.

[0025] Figure 5 is a schematic diagram of part of the structure of embodiment 1 of the application.

[0026] Figure 6 is Figure 5 is a partial enlarged view of part B in FIG. 7.

[0027] Figure 7 is Figure 5 is a partial enlarged view of part C in FIG. 7.

[0028] Figure 8 is a schematic diagram of the coating mechanism of embodiment 2 of the application.

[0029] Figure 9 is a schematic diagram of the coating mechanism of embodiment 3 of the application.

[0030] Figure 10 is a physical diagram of the polar plate made by the embodiment 1 of the present application.

[0031] Explanation of reference signs:

[0032] 1, support table; 11, avoiding groove; 2, coating mechanism; 21, coating; 22, first support shaft; 23, connecting shaft; 24, driving shaft; 25, accommodating space; 26, support; 27, storage box; 28, coating shaft; 29, adjusting shaft; 3, pressing mechanism; 31, pressing plate; 32, lifting table; 4, feeding mechanism; 41, feeding rack; 411, sliding rail; 412, mounting plate; 4121, sliding groove; 42, feeding plate; 421, clamping groove; 43, heating wire; 44, sliding block; 45, spring; 5, first driving mechanism; 51, gear; 52, rack; 53, sleeve; 54, air cylinder; 6, second driving mechanism; 61, mounting block; 62, guide rail; 63, threaded rod; 64, first motor; 7, second support shaft; 8, support plate; 9, second motor; 10, screw rod; 101, T-shaped block; 102, gantry. DETAILED DESCRIPTION

[0033] The following will be described in detail with reference to the accompanying drawings. Figures 1-9 The present application will be further described in detail. EMBODIMENT

[0034] Reference will be made to Figure 1 A device for preparing a polar plate for a vanadium flow battery includes a support table 1, a coating mechanism 2 mounted on the upper end of the support table 1, a pressing mechanism 3 mounted on the upper end of the support table 1, a feeding mechanism 4 slidingly connected to the support table 1, and a gantry 102 fixed by bolts on the upper end of the support table 1.

[0035] Reference will be made to Figure 1 , Figure 2 The coating mechanism 2 includes a pair of supports 26 fixedly mounted on the upper end of the support table 1, and a driving shaft 24 rotationally connected between the two supports 26 (the driving shaft 24 is driven by a motor or the like driving member). The coating mechanism 2 further includes a coating shaft 28 abutting against the driving shaft 24, and a storage box 27 for storing coating material, the upper end of the storage box 27 being open, the upper end opening being rectangular, the vertical cross section of the storage box 27 being “U” shaped, the coating shaft 28 being rotationally connected to the upper end opening of the storage box 27, and the storage box 27 being mounted on the gantry 102 by a steel plate. The coating mechanism 2 further includes a coating 21 in the form of a closed ring, the coating 21 being sleeved on the driving shaft 24 and clamped between the coating shaft 28 and the driving shaft 24.

[0036] Reference will be made to Figure 2 , Figure 3, the coating mechanism 2 further comprises a plurality of first support shafts 22, the cross section of the first support shaft 22 comprises an oblong, and an arc is connected to two short sides of the oblong. The plurality of first support shafts 22 are divided into two groups, the number of the two groups of first support shafts 22 is the same, and the coating 21 is wound on the support shaft.

[0037] With reference to Figure 3 , Figure 4 , the second drive mechanism 6 further comprises a first motor 64 mounted on the upper end of the guide rail 62, and a threaded rod 63 fixedly connected to the output shaft of the first motor 64, the threaded rod 63 penetrates the mounting block 61.

[0038] With reference to Figure 3 , Figure 4 , the second drive mechanism 6 comprises four guide rails 62 fixedly mounted on the upper end of the support table 1, a plurality of mounting blocks 61 slidably connected to the guide rails 62, the four guide rails 62 are perpendicular to the support table 1 and parallel to each other, the intersection line of the four guide rails 62 and the support table 1 is a rectangle, and the two ends of the first support shaft 22 are welded with a connecting shaft 23 with a circular cross section, the connecting shaft 23 penetrates the mounting block 61, and the connecting shaft 23 is rotatably connected with the mounting block 61 and has damping therebetween. The second drive mechanism 6 further comprises a first motor 64 mounted on the upper end of the guide rail 62, and a threaded rod 63 fixedly connected to the output shaft of the first motor 64, the threaded rod 63 penetrates the mounting block 61.

[0039] With reference to Figure 3 , Figure 4 , the threads on the threaded rod 63 are designed such that the pitch gradually increases from bottom to top, and when the first motor 64 rotates the same number of turns, the mounting block 61 located at the top moves a smaller stroke, and the mounting block 61 located at the bottom moves a larger stroke. When the first drive mechanism 5 and the second drive mechanism 6 are not started, the coating mechanism 2 is in an initial state, the coating 21 supported by the first support shaft 22 is arranged in a snake shape, and the adjacent two layers of coating 21 are parallel to each other, and the adjacent coating 21 forms a containing space 25, the size of the upper and lower adjacent containing spaces is the same, and they are all rectangular when viewed from left to right.

[0040] With reference to Figure 2 , in order to keep the uppermost layer and the lowermost layer of the coating 21 horizontal, two additional adjusting shafts 29 with a circular cross section are added, the two adjusting shafts 29 are located in the same column, one is at the top and the other is at the bottom, and the plurality of first support shafts 22 are located between the two adjusting shafts 29, the diameter of the adjusting shaft 29 is approximately equal to the diameter of the connecting shaft 23, and the highest point of the upper adjusting shaft is in the same plane as the upper end of the first support shaft 22 in the other column, and by the same reasoning, the lowest point of the lower adjusting shaft is in the same plane as the lower end of the first support shaft 22 in the other column.

[0041] With reference to Figure 3 , Figure 4The first driving mechanism 5 comprises a gear 51 sleeved on the connecting shaft 23, a rack 52 engaged with the gear 51, a sleeve 53 for embedding the rack 52, and a cylinder 54 fixedly connected to the rack 52.

[0042] With reference to Figure 5 , Figure 6 The support table 1 is provided with two T-shaped avoiding grooves 11, the extending direction of the avoiding grooves 11 is perpendicular to the first support shaft 22 so that the rack 52 and the gear 51 can be separated, a T-shaped block 101 is slidingly connected in the avoiding groove 11, the T-shaped block 101 is fixedly connected to the sleeve 53, a lead screw 10 is provided on the T-shaped block 101 and located in the avoiding groove 11, and the second motor 9 is fixedly connected to the lead screw 10.

[0043] In operation, the second motor 9 is started to drive the lead screw 10 to rotate, and the T-shaped block 101 moves in the avoiding groove 11 to drive the sleeve 53, the cylinder 54 and the rack 52 to move away from or close to the gear 51.

[0044] With reference to Figure 1 The pressing mechanism 3 comprises an oil cylinder installed on the upper end of the gantry 102, a pressing plate 31 installed on the output shaft of the oil cylinder, and a lifting table 32 installed on the upper end of the support table 1, and the projection of the pressing plate 31 in the vertical direction coincides with the upper end surface of the lifting table 32. The first support shaft 22 is located between the lifting table 32 and the pressing plate 31, and the projection of the coating 21 supported by the first support shaft 22 in the vertical direction is located in the lifting table 32.

[0045] With reference to Figure 1 , Figure 5 , Figure 7 The feeding mechanism 4 comprises a feeding frame 41, the feeding frame 41 comprises two sliding rails 411 slidingly connected to the two grooves, and a mounting plate 412 perpendicular to the sliding rails 411, and the sliding direction of the sliding rails 411 is parallel to the axial direction of the first support shaft 22. The feeding mechanism 4 further comprises a plurality of feeding plates 42 installed on the feeding frame 41, the upper end of each feeding plate 42 is provided with a clamping groove 421 for embedding a raw material plate, and a heating wire 43 is embedded in the clamping groove 421.

[0046] With reference to Figure 5 , Figure 7 The mounting plate 412 is provided with a sliding groove 4121 on the surface close to the first support shaft 22, the sliding groove 4121 extends in the vertical direction, the feeding plate 42 is fixedly connected with a sliding block 44 slidingly connected in the sliding groove 4121, and a spring 45 is arranged between adjacent sliding blocks 44 and embedded in the sliding groove 4121. In the natural state of the spring 45, the feeding plate 42 is aligned with the accommodating space 25.

[0047] The material for coating 21 used in this embodiment 1 is glass fiber, wherein the preparation method of the coating is as follows: 1 part by mass of carbon nanotube, 10 parts by mass of acetone, 20 parts by mass of water, and 0.1 part by mass of polyvinylpyrrolidone are uniformly dispersed at high speed, and then deaerated under negative pressure to form liquid A; 0.3 parts by mass of cumene hydroperoxide is dissolved in 5 parts by mass of ethanol to form liquid B; when used, liquid B is sprayed on the surface of the polar plate in an amount of 0.01 g / cm 2 , and then liquid A is printed on one side of the polar plate sprayed with liquid B in an amount of 0.05 g / cm 2 .

[0048] The implementation principle of this embodiment 1 is as follows:

[0049] I. Liquid B is sprayed on the polar plate for standby; liquid A is loaded into the storage box 27.

[0050] II. Start the driving shaft 24, which drives the coating 21 to rotate, and at the same time drives the coating shaft 28 to rotate, which rotates in the storage box 27 to press the liquid A onto the coating 21.

[0051] III. Place a plurality of raw material plates in the clamping groove 421 respectively, push the sliding rail 411, and the raw material plate 42 enters the accommodating space 25.

[0052] IV. Start the air cylinder 54, which drives the rack 52 to move, and then the gear 51 drives the first support shaft 22 to rotate, and the first support shaft 22 changes from a vertical state to a horizontal state.

[0053] V. Start the second motor 9, which drives the lead screw 10 to rotate, and the gear 51 and the rack 52 are separated.

[0054] VI. Start the first motor 64, which drives the threaded rod 63 to rotate, and the mounting blocks 61 slide upward, but because the thread pitch of the threaded rod 63 gradually decreases from top to bottom, the mounting blocks 61 located at the bottom move a larger distance, and the mounting blocks 61 located at the top move a smaller distance, so after the first motor 64 is started for a period of time, the mounting blocks 61 approach each other, and the accommodating space 25 becomes smaller.

[0055] VII. Pause the driving shaft 24, and the oil cylinder moves, and the lifting platform 32 rises, under the pressure of the two, the spring 45 is compressed, and the raw material plate 42 moves together with the two, and in the process of being compressed, the heating wire is heated.

[0056] VIII. After the work is finished, restart the first motor 64, and reset the coating mechanism 2.

[0057] Nine, the moving slide rail 411 takes out the feeding plate 42, the conductive layer on the pole plate is grid-shaped, and the mesh number is between 300-400.

[0058] Figure 10 For the physical map of the pole plate of the embodiment, it can be seen that the pole plate surface presents a uniform grid structure. Embodiment

[0059] The difference between embodiment 2 and embodiment 1 is that a second support shaft 7 is used, and the cross section of the second support shaft 7 is circular. The coating 21 supported by the second support shaft 7 forms a containing space 25 between each layer, and the coating 21 between each layer is arranged in parallel, and the distance between adjacent coatings 21 is equal to the diameter of the second support shaft 7. Embodiment

[0060] The difference between embodiment 3 and embodiment 1 is that a support plate 8 is used, and the support plate 8 is rectangular, and a plurality of support plates 8 are arranged in parallel and at equal intervals. Embodiment

[0061] The difference between the embodiment and the embodiment is that the preparation method of the coating is: 1 part by mass of carbon nanotubes, 15 parts by mass of acetone, 30 parts by mass of water, and 0.3 parts by mass of polyvinylpyrrolidone are uniformly dispersed at high speed, and are deaerated under negative pressure to form A liquid; 0.6 parts by mass of cumene hydroperoxide is dissolved in 10 parts by mass of ethanol to form B liquid; when used, B liquid is sprayed on the surface of the pole plate in an amount of 0.01 g / cm 2 , and then A liquid is printed on one side of the pole plate sprayed with B liquid in an amount of 0.05 g / cm 2 . Embodiment

[0062] The difference between the embodiment and the embodiment is that the preparation method of the coating is: 1 part by mass of carbon nanotubes, 13 parts by mass of acetone, 25 parts by mass of water, and 0.2 parts by mass of polyvinylpyrrolidone are uniformly dispersed at high speed, and are deaerated under negative pressure to form A liquid; 0.5 parts by mass of cumene hydroperoxide is dissolved in 7 parts by mass of ethanol to form B liquid; when used, B liquid is sprayed on the surface of the pole plate in an amount of 0.01 g / cm 2 , and then A liquid is printed on one side of the pole plate sprayed with B liquid in an amount of 0.05 g / cm 2 .

[0063] Comparative example 1: untreated pole plate is used.

[0064] Comparative example 2: the difference from the embodiment is that A liquid and B liquid are not used.

[0065] The polar plates obtained in Examples 1-5 and Comparative Examples 1-2 were assembled into vanadium flow battery stacks of the same specifications, and were subjected to charge-discharge cycle tests under the same conditions, and the voltage efficiency and energy efficiency of the vanadium flow battery were recorded, and the results are shown in Table 1.

[0066] Table 1 Summary of cell voltage efficiency

[0067] As can be seen from Table 1, compared with Comparative Example 1-2, Examples 1-5 have higher voltage efficiency and energy efficiency, mainly because the cumene hydroperoxide in the B liquid can oxidize the surface of the polar plate, and combine with the functional carbon material in the polar plate through π-π interaction, so that the A liquid can be more uniformly dispersed on the surface of the polar plate. At the same time, the acetone in the A liquid can dissolve a part of the polar plate surface, and after coating and hot pressing, the polar plate surface forms a grid-shaped conductive layer, which is combined more tightly with the polar plate, thereby increasing the contact area between the graphite felt and the polar plate and reducing the contact resistance therebetween.

[0068] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made in terms of structure, shape, principle, etc. according to the present application should be encompassed within the protection scope of the present application.

Claims

1. An apparatus for preparing a polar plate for a vanadium flow battery, characterized by: The application relates to a coating device for raw material plates, which comprises a supporting table (1), a coating mechanism (2) mounted on the supporting table (1), and a pressing mechanism (3) mounted on the supporting table (1); the coating mechanism (2) comprises a coating (21), a plurality of supporting members for supporting the coating (21) in a serpentine shape, a driving shaft (24) for driving the coating (21) to move, and a coating shaft (28) for coating the coating (21) with paint; the coating (21) supported by the supporting members forms a plurality of containing spaces (25) for placing raw material plates; the pressing mechanism (3) comprises a lifting table (32) and a pressing plate (31) corresponding to the lifting table (32); and the supporting members are located between the lifting table (32) and the pressing plate (31).

2. The apparatus for preparing a polar plate for a vanadium flow battery according to claim 1, characterized by: The supporting members are supporting shafts; a plurality of the supporting shafts are evenly divided into two rows; the distance between two adjacent supporting shafts in each row is equal to the diameter of the supporting shaft; and the projections of the two rows of supporting shafts on a symmetry plane are staggered and do not coincide.

3. The apparatus for preparing a polar plate for a vanadium flow battery according to claim 2, characterized by: The cross section of the supporting shaft is a rectangle, and two arcs are connected to the two sides of the rectangle respectively; the coating mechanism (2) further comprises a first driving mechanism (5) for driving the supporting shaft to rotate along the axis of the supporting shaft, and a second driving mechanism (6) for driving the supporting shafts to move close to each other.

4. The apparatus for preparing a polar plate for a vanadium flow battery according to claim 3, characterized by: The first driving mechanism (5) is mounted on a gear (51) of the supporting shaft, engages with a rack (52), is embedded in a sleeve (53) for embedding the rack (52), and is driven by a cylinder (54) to move; the cylinder (54) and the sleeve are mounted on the supporting table (1).

5. The apparatus for preparing a polar plate for a vanadium flow battery according to claim 4, characterized in that: The second driving mechanism (6) comprises a mounting block (61) for mounting the supporting shaft, a guide rail (62) for embedding the mounting block (61), a threaded rod (63) penetrating through the mounting block (61), and a first motor (64) for driving the threaded rod (63) to rotate; the first motor (64) is mounted on the guide rail (62); the cylinder (54) and the guide rail (62) are slidingly connected to the supporting table (1) so that the rack (52) and the gear (51) are separated.

6. The apparatus for preparing a polar plate for a vanadium flow battery according to claim 1, characterized by: The supporting members are supporting plates (8); a plurality of the supporting plates (8) are arranged in parallel and at equal intervals.

7. The apparatus for preparing a plate for a vanadium flow battery according to any one of claims 1 to 6, characterized in that: The application further comprises a feeding mechanism (4); the feeding mechanism (4) comprises a feeding frame (41) slidingly connected to the supporting table (1), a plurality of feeding plates (42) mounted on the feeding frame (41), and heating wires (43) embedded in the feeding plates (42); the feeding frame (41) comprises a sliding rail (411) and a mounting plate (412) perpendicular to the sliding rail (411); the mounting plate (412) is provided with a sliding groove (4121); the feeding plates (42) are fixedly connected with sliding blocks (44) slidingly connected in the sliding groove (4121); springs (45) are arranged between adjacent sliding blocks (44) and embedded in the sliding groove (4121).

8. The apparatus for preparing a polar plate for a vanadium flow battery according to claim 7, characterized by: The upper end of the feeding plate (42) is provided with a clamping groove (421) for embedding a raw material plate; and the heating wires (43) are embedded in the clamping groove (421).

9. A coating for use in the apparatus for producing a polar plate for a vanadium flow battery according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: uniformly dispersing 1 part by mass of carbon nanotubes, 10-15 parts by mass of acetone, 20-30 parts by mass of water and 0.1-0.3 parts by mass of polyvinylpyrrolidone at high speed, and performing vacuum degassing to form A liquid; and dissolving 0.3-0.6 parts by mass of cumene hydroperoxide in 5-10 parts by mass of ethanol to form B liquid.

10. A plate prepared using the apparatus of any one of claims 1-9, wherein: The polar plate comprises a raw plate and a mesh conductive layer combined with the raw plate, and the mesh conductive layer has a mesh number of 300-400.

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