A method for preparing electrode composite material for supercapacitor

Abstract

The present invention relates to the technical field of preparing composite materials for supercapacitor electrodes, and in particular to a method for preparing composite materials for supercapacitor electrodes, specifically comprising the following steps: step one, stirring and mixing; step two, coating treatment; step three, drying operation; and step four, cold pressing. The coating equipment involved in the coating treatment in step two comprises a base plate and a coating unit, the coating unit being arranged at the upper end of the base plate, and the coating unit comprising two support plates symmetrically arranged at the upper end of the base plate. The existing method has a high coating efficiency for coating conductive foil, but it cannot clamp and limit the two sides of the substrate. When the substrate is in a tensioned state and rotates, it is easy to shrink inward and produce wrinkles, which reduces the coating effect. The tensioning unit used in the present invention can continuously tension and limit the two sides of the conductive foil, preventing the conductive foil from shrinking inward and producing wrinkles during transportation, thereby ensuring the coating effect.

Description

Technical Field

[0001] The present invention relates to the technical field of supercapacitor electrode composite material preparation, and in particular to a method for preparing an electrode composite material for a supercapacitor. Background Art

[0002] In the manufacturing process of supercapacitors, the preparation of electrode composite materials is a key link that determines their performance and life. The precision and scientific nature of this process directly affect the performance of supercapacitors in practical applications, such as instantaneous large current discharge, rapid charging and discharging and other high-demand scenarios. The current preparation method of electrode composite materials for supercapacitors mainly includes the following steps: electrode material selection, stirring and mixing to make positive electrode slurry, positive electrode current collector coating, drying operation and cold pressing processing. Among them, positive electrode current collector coating is the most important step. The positive electrode current collector generally chooses conductive carbon-coated foil. Conductive carbon-coated foil is a foil with conductive properties. It is usually made by coating a layer of positive electrode active material slurry on the surface of the material. This coating can make the foil have conductivity, flexibility, corrosion resistance, high thermal conductivity and other characteristics.

[0003] In the existing method of coating conductive foil, a suitable foil is usually selected as a substrate, such as copper foil or aluminum foil, and then the substrate is cleaned and surface treated to ensure that the surface is smooth and clean, and oil and impurities are removed to ensure good adhesion of the coating after coating. Then, carbon black or graphite powder with good conductive properties is prepared and mixed evenly with polymer resin or other adhesives to form a conductive coating material. The substrate is then installed on a coating machine, and the coating machine is used to evenly coat the prepared coating material on the surface of the substrate to ensure that the thickness of the coating is uniform. Finally, the coated foil is sent to a baking oven for curing treatment to fully cure the coating material and firmly bond to the substrate. The substrate is then wound by a winding machine. This method is simple to operate, has high coating efficiency, and can be coated on substrates of different sizes, with high coating flexibility.

[0004] However, in the above method, after the substrate is installed on the coating machine, its two sides are not clamped and limited. If the two conductive rollers on the coating machine are long, the substrate is in a tensioned state and tends to shrink inward and produce wrinkles when rotating, which reduces the flatness of the substrate and causes gaps and cracks in the coating material, reducing the coating effect. Summary of the Invention

[0005] Based on this, it is necessary to provide a method for preparing electrode composite materials for supercapacitors, aiming to solve the technical defects of the existing technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a method for preparing an electrode composite material for a supercapacitor, specifically comprising the following steps:

[0007] Step 1, stirring and mixing: the positive electrode active material, conductive agent, binder, and solvent components are placed in a chemical container in proportion and stirred and mixed to obtain a positive electrode active material slurry; wherein the positive electrode active material is activated carbon or metal oxide modified by soaking in tetramethylammonium hydroxide solution, which serves as a charge storage and release material. The tetramethylammonium hydroxide solution is a strongly alkaline organic solvent. The positive electrode active material is immersed in the tetramethylammonium hydroxide solution. Controlling the soaking time can ensure that the modification reaction is sufficient but does not destroy the electrode structure. The tetramethylammonium hydroxide modification improves the surface activity of the positive electrode active material, increases the active sites, and expands the specific surface area, thereby improving the charge transfer speed and energy storage efficiency of the supercapacitor; the conductive agent is carbon black, which is used to improve the conductivity of the electrode; the binder is polyvinyl alcohol, polyacrylate or polytetrafluoroethylene, which is used to bond the various components together and enhance the stability of the electrode; the solvent is N-methylpyrrolidone, acetone or ethanol, which is used to adjust the viscosity and viscosity of the slurry for easy coating;

[0008] Step 2: Coating: Coating the positive electrode active material slurry onto the positive electrode current collector using a coating device, wherein the positive electrode current collector is a conductive carbon-coated foil;

[0009] Step 3: Drying: Drying the positive electrode current collector coated with the positive electrode active material slurry to obtain a crude positive electrode active material layer;

[0010] Step 4: Cold pressing: cold pressing the dried crude positive electrode active material layer to obtain a positive electrode active material layer;

[0011] The coating equipment involved in the coating process in step 2 includes a base plate and a coating unit, wherein the coating unit is arranged at the upper end of the base plate, and the coating unit includes two support plates symmetrically installed front and back on the upper end of the base plate, and a limiting roller is connected to the two support plates for common rotation, and a discharge frame connected to the two support plates is provided on the left side of the limiting roller, and a coating roller is rotatably connected in the discharge frame.

[0012] The tensioning unit is arranged on the right side of the coating unit and connected to the base plate. The tensioning unit includes two support rods symmetrically installed on the upper end of the base plate. An angle adjustment component is installed between the two support rods. A U-shaped plate with an opening facing the coating unit is installed on the angle adjustment component, and a clamping component is connected inside the U-shaped plate.

[0013] The guiding unit is arranged on the right side of the tensioning unit and connected to the base plate. The guiding unit includes a positioning frame with a U-shaped structure and an opening facing downward, which is installed on the upper end of the base plate. Sliding holes are provided on the two vertical sections of the positioning frame. The two sliding holes are commonly connected to a lifting component, and a traction roller is connected inside the lifting component. Two limiting components connected to the lifting component are symmetrically arranged front and back above the traction roller.

[0014] According to an embodiment of the present invention, the coating unit also includes two distance-adjusting components that are symmetrically distributed front and back and are respectively connected to the corresponding support plates. The distance-adjusting components are connected to the discharge frame. An adjusting screw is connected to any one of the distance-adjusting components. The adjusting screw is threadedly connected to the corresponding support plate. Two strip rods that are symmetrically distributed left and right and fixedly connected to the two support plates are arranged under the coating roller. A collection frame is placed together at the upper ends of the two strip rods, and a cleaning brush fixedly connected to the two support plates is arranged on the right side of the collection frame.

[0015] According to an embodiment of the present invention, the distance adjusting component includes a rectangular through hole opened on the support plate, and two guide rods are symmetrically installed in the rectangular through hole. A sliding block is slidably connected to the two guide rods, the sliding block is fixedly connected to the discharge frame, the sliding block is rotatably connected to the coating roller, and the adjusting screw is rotatably connected to the left end of the corresponding sliding block.

[0016] According to an embodiment of the present invention, the angle adjustment component includes a guide block installed between the two support rods, an arc-shaped through hole is opened in the guide block, an arc-shaped rod is slidably connected in the arc-shaped through hole, the upper end of the arc-shaped rod is fixedly connected to the U-shaped plate, a connecting spring is installed between the U-shaped plate and the guide block, a guide countersunk hole is opened on the outer arc hole wall of the arc-shaped through hole, a limiting plate is slidably connected in the guide countersunk hole, and a feed screw is rotatably connected to the end of the limiting plate away from the arc rod, and the feed screw is threadedly connected to the guide block.

[0017] According to an embodiment of the present invention, the clamping component includes two adjusting through holes that are symmetrically distributed front and back and are respectively opened on the vertical sections of the U-shaped plate, and a lifting plate is slidably connected in the adjusting through holes, and the upper end of the lifting plate located on the front side is rotatably connected to a rotating screw, and the rotating screw is threadedly connected to the upper hole wall of the adjusting through hole located on the front side, and a guide column is installed on the upper end of the lifting plate located on the rear side, and the guide column slides through the upper hole wall of the adjusting through hole located on the rear side, and two clamping assemblies are symmetrically arranged up and down inside the U-shaped plate, and the clamping assembly located above is installed between the two lifting plates, and the clamping assembly located below is fixedly connected to the inner end of the vertical section of the U-shaped plate, and the front end of the U-shaped plate is fixedly connected to a driving motor, and the output shaft of the driving motor passes through the vertical section of the U-shaped plate and is fixedly connected to the clamping assembly located below.

[0018] According to an embodiment of the present invention, the guide unit also includes two rectangular blocks that are symmetrically distributed front to back and are respectively installed at the right ends of the two vertical sections of the positioning frame. A rotating roller is connected to rotate together between the two rectangular blocks, and two annular openings are symmetrically opened front to back on the annular surface of the rotating roller.

[0019] According to an embodiment of the present invention, the lifting component includes a lifting screw threadedly connected to the middle section of the positioning frame, the lower end of the lifting screw is rotatably connected to the lifting frame, the lifting frame is U-shaped and the opening is facing downward, the two vertical sections of the lifting frame are respectively rotatably sleeved on the two ends of the traction roller, and the outer end of the vertical section of the lifting frame is equipped with a moving block rotatably sleeved on the end of the traction roller, and the moving block is slidably connected to the sliding through hole.

[0020] According to an embodiment of the present invention, the limiting component includes a limiting screw threadedly connected to the middle section of the lifting frame, the lower end of the limiting screw is rotatably connected to an arc plate, the outer arc surface of the arc plate is installed with a guide rod that slides through the middle section of the lifting frame, and the inner arc surface of the arc plate is rotatably connected to a plurality of evenly distributed rotating rods.

[0021] According to an embodiment of the present invention, the clamping assembly includes a conveyor belt, the upper conveyor belt is installed between the two lifting plates, the lower conveyor belt is connected to the inner end of the vertical section of the U-shaped plate, and a plurality of evenly distributed rubber sleeves are installed on the outer surface of the conveyor belt.

[0022] According to an embodiment of the present invention, a baffle plate rotatably sleeved on the middle of the coating roller is vertically installed in the middle of the discharge frame.

[0023] In summary, the present invention includes the following beneficial technical effects: 1. The tensioning unit used can continuously tension and limit the two sides and the middle of the conductive foil, preventing the conductive foil from shrinking inward and wrinkling during transportation, thereby avoiding cracks in the coating material after coating and ensuring the coating effect.

[0024] 2. The tensioning unit and the limiting component work together to further increase the limitation on both sides of the conductive foil, avoid the inward contraction of both sides of the conductive foil, and improve the stability of the conductive foil movement.

[0025] 3. The angle adjustment component can move along with the conductive foil as the conductive foil is gradually tightened, thereby preventing the conductive foil from bending during the tensioning process and ensuring the flatness of the conductive foil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 The figure shows a process flow chart of a method for preparing an electrode composite material for a supercapacitor provided in accordance with an embodiment of the present invention.

[0028] Figure 2 A schematic diagram of a first-view stereoscopic structure of a method for preparing an electrode composite material for a supercapacitor provided in accordance with an embodiment of the present invention is shown.

[0029] Figure 3 A schematic diagram of a second perspective stereoscopic structure of a method for preparing an electrode composite material for a supercapacitor provided in accordance with an embodiment of the present invention is shown.

[0030] Figure 4 A front view of a method for preparing an electrode composite material for a supercapacitor provided according to an embodiment of the present invention is shown.

[0031] Figure 5 A left side view of a method for preparing an electrode composite material for a supercapacitor provided in accordance with an embodiment of the present invention is shown.

[0032] Figure 6 Shown Figure 5 Cross-sectional view of AA in the figure.

[0033] Figure 7 Shown Figure 6 Magnified view of the middle N region.

[0034] Figure 8 Shown Figure 5 Cross-sectional view of the BB.

[0035] Figure 9 A schematic structural diagram of a tensioning unit in a method for preparing an electrode composite material for a supercapacitor provided in accordance with an embodiment of the present invention is shown.

[0036] Figure 10 A schematic diagram of a work process according to an embodiment of the present invention is shown.

[0037] The above drawings include the following reference numerals: 1. bottom plate; 2. coating unit; 21. support plate; 22. limiting roller; 23. discharge frame; 231. baffle plate; 24. coating roller; 25. distance adjustment component; 251. rectangular through hole; 252. guide rod; 253. sliding block; 26. adjusting screw; 27. strip rod; 28. collecting frame; 29. ​​cleaning brush; 3. tensioning unit; 31. support rod; 32. angle adjustment component; 321. guide block; 322. arc through hole; 323. arc rod; 324. connecting spring; 325. feed screw; 326. limiting plate; 327. guide Countersunk hole; 33, U-shaped plate; 34, clamping component; 341, adjusting hole; 342, lifting plate; 343, rotating screw; 344, clamping assembly; 3441, conveyor belt; 3442, rubber sleeve; 345, drive motor; 346, guide column; 4, guide unit; 41, positioning frame; 411, sliding hole; 42, lifting component; 421, lifting screw; 422, lifting frame; 423, moving block; 43, traction roller; 44, limiting component; 441, limiting screw; 442, arc plate; 443, guide rod; 444, rotating rod; 45, rectangular block; 46, rotating roller. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] See Figure 1, a method for preparing an electrode composite material for a supercapacitor, specifically comprising the following steps: Step 1, stirring and mixing: placing a positive electrode active material, a conductive agent, a binder, and a solvent into a chemical container in proportion and stirring and mixing them to obtain a positive electrode active material slurry; wherein the positive electrode active material is activated carbon or a metal oxide modified by soaking in a tetramethylammonium hydroxide solution, which serves as a charge storage and release material, and the tetramethylammonium hydroxide solution is a strongly alkaline organic solvent, and the positive electrode active material is immersed in the tetramethylammonium hydroxide solution, and controlling the soaking time can ensure that the modification reaction is sufficient without destroying the electrode structure. The tetramethylammonium hydroxide modification improves the surface activity of the positive electrode active material, increases the active sites, and expands the specific surface area, thereby improving the charge transfer speed and energy storage efficiency of the supercapacitor; the conductive agent is carbon black, which is used to improve the conductivity of the electrode; the binder is polyvinyl alcohol, polyacrylate or polytetrafluoroethylene, which is used to bond the various components together and enhance the stability of the electrode; the solvent is N-methylpyrrolidone, acetone or ethanol, which is used to adjust the viscosity and viscosity of the slurry for easy coating.

[0040] Step 2: Coating treatment: coating the positive electrode active material slurry on the positive electrode current collector through a coating device, wherein the positive electrode current collector is a conductive carbon-coated foil.

[0041] Step 3: Drying: Drying the positive electrode current collector coated with the positive electrode active material slurry to obtain a crude positive electrode active material layer.

[0042] Step 4: Cold pressing: The dried crude positive electrode active material layer is subjected to cold pressing to obtain a positive electrode active material layer.

[0043] See Figures 2 to 5 , wherein the coating equipment involved in the coating process in step 2 includes a base plate 1 and a coating unit 2, the coating unit 2 is arranged at the upper end of the base plate 1, and the coating unit 2 includes two support plates 21 symmetrically installed on the upper end of the base plate 1 in front and back directions, and a limiting roller 22 is connected to the two support plates 21 for rotation. A discharge frame 23 connected to the two support plates 21 is provided on the left side of the limiting roller 22, and a coating roller 24 is rotatably connected in the discharge frame 23.

[0044] See Figure 2 、 Figure 3 and Figure 6The coating unit 2 also includes two distance adjusting components 25 that are symmetrically distributed front and back and are respectively connected to the corresponding support plates 21. The distance adjusting components 25 are connected to the discharge frame 23. Any one of the distance adjusting components 25 is connected to an adjusting screw 26, and the adjusting screw 26 is threadedly connected to the corresponding support plate 21. Two strip rods 27 that are symmetrically distributed left and right and fixedly connected to the two support plates 21 are provided below the coating roller 24. A collecting frame 28 is placed on the upper ends of the two strip rods 27. A cleaning brush 29 that is fixedly connected to the two support plates 21 is provided on the right side of the collecting frame 28.

[0045] See Figure 2 、 Figure 3 、 Figure 6 and Figure 10 During specific operation, the distance adjusting component 25 initially drives the discharge frame 23 and the coating roller 24 to the far left, and the collecting frame 28 is manually placed on the upper end of the two strip rods 27. The two strip rods 27 limit the collecting frame 28. The collecting frame 28 is used to collect the coating material dripping during the coating process, and the conductive foil placed on the unwinding device is clamped by the existing clamping claws, and the conductive foil is passed upward from the bottom of the gap between the coating roller 24 and the limiting roller 22. Then, the adjusting screw 26 is rotated, and the adjusting screw 26 drives the distance adjusting component 25 to move. The distance adjusting component 25 drives the discharge frame 23 and the coating roller 24 to move toward the conductive foil until the coating roller 24 is in close contact with the conductive foil, and the coating roller 24 and the limiting roller 22 clamp and limit the conductive foil.

[0046] See Figure 3 and Figure 4 The distance adjusting component 25 includes a rectangular through hole 251 opened on the support plate 21, and two guide rods 252 are symmetrically installed in the rectangular through hole 251. The two guide rods 252 are slidably connected to a sliding block 253. The sliding block 253 is fixedly connected to the discharge frame 23. The sliding block 253 is rotatably connected to the coating roller 24. The adjusting screw 26 is rotatably connected to the left end of the corresponding sliding block 253.

[0047] During specific operation, the sliding block 253 is initially located at the leftmost side of the rectangular through hole 251, so that the distance between the coating roller 24 and the limiting roller 22 is the largest, thereby facilitating the conductive foil to pass between the coating roller 24 and the limiting roller 22. After the conductive foil passes between the coating roller 24 and the limiting roller 22, the adjusting screw 26 is rotated, and the adjusting screw 26 drives the corresponding sliding block 253 to move on the two guide rods 252. The sliding block 253 drives the discharge frame 23 and the other sliding block 253 to move. The discharge frame 23 drives the coating roller 24 to move toward the conductive foil and tightly adhere to it. The coating roller 24 squeezes the conductive foil onto the limiting roller 22, so that when the conductive foil moves, it can drive the coating roller 24 and the limiting roller 22 to rotate.

[0048] See Figure 2 and Figure 3 The method for preparing an electrode composite material for a supercapacitor also includes a tensioning unit 3, which is arranged on the right side of the coating unit 2 and connected to the base plate 1. The tensioning unit 3 includes two support rods 31 symmetrically installed on the upper end of the base plate 1 in front and back directions, and an angle adjustment component 32 is installed between the two support rods 31. A U-shaped plate 33 with an opening facing the coating unit 2 is installed on the angle adjustment component 32, and a clamping component 34 is connected inside the U-shaped plate 33.

[0049] During operation, the conductive foil passing between the coating roller 24 and the limiting roller 22 enters the interior of the U-shaped plate 33 and passes between the two clamping components 34 .

[0050] See Figure 6 、 Figure 8 and Figure 9 The cam 342 is fixed to the upper end of the U-shaped plate 33 so as to prevent the cam from sliding out of the locking cam 342.

[0051] During specific operation, initially, the lifting plate 342 drives the distance between the clamping assembly 344 located above and the clamping assembly 344 located below to the maximum position, and then the conductive foil enters the U-shaped plate 33, and one side of the conductive foil passes between the two clamping assemblies 344, and then the rotating screw 343 is rotated, and the rotating screw 343 drives the lifting plate 342 to descend, and the lifting plate 342 drives the clamping assembly 344 located above to move toward the conductive foil, and the guide column 346 guides the movement of the lifting plate 342. The clamping assembly 344 located above squeezes the conductive foil onto the clamping assembly 344 located below, thereby clamping the conductive foil. The two clamping assemblies 344 cooperate with each other to realize the function of clamping and limiting the two sides and the middle of the conductive foil, avoiding wrinkles in the conductive foil during transportation, thereby avoiding cracks in the coating material after coating, and ensuring the coating effect.

[0052] See Figure 8 and Figure 9 The clamping assembly 344 includes a conveyor belt 3441. The upper conveyor belt 3441 is installed between the two lifting plates 342. The lower conveyor belt 3441 is connected to the inner end of the vertical section of the U-shaped plate 33. A plurality of evenly distributed rubber sleeves 3442 are installed on the outer surface of the conveyor belt 3441.

[0053] During specific operation, the lifting plate 342 drives the conveyor belt 3441 located above to move toward the conductive foil, and the conveyor belt 3441 drives the multiple rubber sleeves 3442 located above to move toward the conductive foil and push the conductive foil onto the conveyor belt 3441 and multiple rubber sleeves 3442 located below. The multiple rubber sleeves 3442 distributed above and below clamp the uncoated areas of the conductive foil from both sides and the middle, effectively limiting the inward contraction of the conductive foil during the traction movement, thereby avoiding wrinkles in the conductive foil and ensuring that the conductive foil is always in a flat state. The conductive foil moves from one end to the other end between the upper and lower conveyor belts 3441. During the movement, the multiple rubber sleeves 3442 on the two conveyor belts 3441 always clamp and limit the two sides and the middle of the conductive foil, ensuring the stability of the conductive foil limitation.

[0054] See Figure 2 、 Figure 6 and Figure 8 The method for preparing an electrode composite material for a supercapacitor also includes a guide unit 4, which is arranged on the right side of the tensioning unit 3 and connected to the base plate 1. The guide unit 4 includes a positioning frame 41 with a U-shaped structure and an opening facing downward, which is installed on the upper end of the base plate 1. Sliding holes 411 are provided on the two vertical sections of the positioning frame 41. The two sliding holes 411 are commonly connected to a lifting component 42, and a traction roller 43 is connected to the lifting component 42. Two limiting components 44 connected to the lifting component 42 are symmetrically arranged front and back above the traction roller 43.

[0055] See Figure 2 、 Figure 6 and Figure 8 The guide unit 4 also includes two rectangular blocks 45 that are symmetrically distributed front to back and are respectively installed at the right ends of the two vertical sections of the positioning frame 41. A rotating roller 46 is connected to the two rectangular blocks 45 for common rotation, and two annular openings are symmetrically opened front to back on the annular surface of the rotating roller 46.

[0056] During specific operation, the conductive foil passing through the two clamping assemblies 344 continues to move and passes through the upper end of the traction roller 43, and then passes through the lower end of the rotating roller 46 and is connected to the existing powered winding equipment outside. The annular opening on the rotating roller 46 can effectively prevent the rotating roller 46 from contacting the coating material on the conductive foil, thereby avoiding damage to the coated conductive foil. Then, the lifting component 42 is adjusted, and the lifting component 42 drives the traction roller 43 to adjust the conductive foil, and the conductive foil gradually enters a tensioned state. When the conductive foil is in a tensioned state, the adjustment of the lifting component 42 is stopped, and the two limiting components 44 are moved to the upper end of the conductive foil, and the conductive foil is pressed, and the two sides of the conductive foil are limited again.

[0057] See Figure 2 、 Figure 3 、 Figure 6 and Figure 8 The lifting component 42 includes a lifting screw 421 threadedly connected to the middle section of the positioning frame 41. The lower end of the lifting screw 421 is rotatably connected to the lifting frame 422. The lifting frame 422 has a U-shaped structure and its opening faces downward. The two vertical sections of the lifting frame 422 are respectively rotatably sleeved on the two ends of the traction roller 43. The outer end of the vertical section of the lifting frame 422 is equipped with a moving block 423 rotatably sleeved on the end of the traction roller 43. The moving block 423 is slidably connected to the sliding through hole 411.

[0058] During specific operation, the traction roller 43 is at the lowest initial position before operation. After the conductive foil passes over the traction roller 43, the lifting screw 421 is rotated. The lifting screw 421 drives the traction roller 43 to move upward through the lifting frame 422 and contact the conductive foil. The lifting frame 422 drives the two moving blocks 423 to move in the sliding through hole 411. The sliding through hole 411 guides the movement of the moving blocks 423. Then the traction roller 43 drives the conductive foil to move upward and gradually pulls the conductive foil, so that the conductive foil is gradually tensioned. When the conductive foil is in a tensioned state, the lifting screw 421 stops rotating.

[0059] See Figure 1 、 Figure 2 、 Figure 5 and Figure 7 The limiting component 44 includes a limiting screw 441 threadedly connected to the middle section of the lifting frame 422, and the lower end of the limiting screw 441 is rotatably connected to an arc plate 442. The outer arc surface of the arc plate 442 is installed with a guide rod 443 that slides through the middle section of the lifting frame 422, and the inner arc surface of the arc plate 442 is rotatably connected to a plurality of evenly distributed rotating rods 444.

[0060] During specific operation, after the conductive foil is in a tensioned state, the limit screw 441 is rotated, and the limit screw 441 drives the arc plate 442 to move downward, and the arc plate 442 drives multiple rotating rods 444 to move to the upper end of the conductive foil and fit tightly against it, thereby realizing the function of limiting the two sides of the conductive foil again, and the guide rod 443 guides the movement of the arc plate 442.

[0061] See Figure 7 and Figure 8 The angle adjustment component 32 includes a guide block 321 installed between the two support rods 31, an arc-shaped through hole 322 is opened in the guide block 321, an arc rod 323 is slidably connected in the arc through hole 322, the upper end of the arc rod 323 is fixedly connected to the U-shaped plate 33, a connecting spring 324 is installed between the U-shaped plate 33 and the guide block 321, a guide countersunk hole 327 is opened on the outer arc hole wall of the arc through hole 322, a limit plate 326 is slidably connected in the guide countersunk hole 327, and the limit plate 326 is rotatably connected to the end of the limit plate 326 away from the arc rod 323, and the feed screw 325 is threadedly connected to the guide block 321.

[0062] During specific operation, during the tensioning process of the conductive foil, the conductive foil drives the U-shaped plate 33 to move through the two clamping components 344, and the U-shaped plate 33 drives the arc rod 323 to move in the arc through hole 322. The connecting spring 324 connects the U-shaped plate 33 and the guide block 321. The curvature of the arc through hole 322 and the arc rod 323 are consistent and coincide with the axis of the limiting roller 22, thereby avoiding bending of the conductive foil during the tensioning process and ensuring the flatness of the conductive foil. When the conductive foil is in the tensioned state, the feed screw 325 is rotated, and the feed screw 325 drives the limiting plate 326 to move toward the outer arc surface of the arc rod 323 and fit closely with it, thereby realizing the function of limiting the arc rod 323, thereby positioning the position of the U-shaped plate 33.

[0063] See Figure 6 A baffle plate 231 is vertically installed in the middle of the discharge frame 23 and is rotatably sleeved on the middle of the coating roller 24.

[0064] During the specific operation, the carbon coating material required for coating is placed in the discharge frame 23, and the baffle 231 divides the discharge frame 23 into two areas, so that two layers of coating are applied on a wider conductive foil, which is convenient for forming two conductive carbon-coated foils after the conductive foil is cut. After the carbon coating material is poured in, the drive motor 345 is connected to the existing power supply outside, and the drive motor 345 and the external winding device are started. The drive motor 345 drives the conveyor belt 3441 located below to rotate. The conveyor belt 3441 located below is connected to the conveyor belt 3441 located above and the multiple rubber sleeves 3442. 3442 cooperate to provide the conductive foil with initial moving power, and at the same time the winding device pulls and winds the conductive foil. When the moving conductive foil passes through the cleaning brush 29, the cleaning brush 29 cleans the surface of the conductive foil to ensure the strength of the connection between the conductive foil and the carbon coating material. The cleaned conductive foil passes through the coating roller 24 and drives the coating roller 24 to rotate. The rotating coating roller 24 smears the carbon coating material in the discharge frame 23 to the surface of the conductive foil, thereby forming a conductive carbon-coated foil. The winding device winds the conductive carbon-coated foil until all the rolled conductive foils are formed into conductive carbon-coated foils and wound up, and the coating is completed.

[0065] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0066] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing an electrode composite material for a supercapacitor, characterized in that: The specific steps include: Step 1: Stirring and mixing: Place the positive electrode active material, conductive agent, binder, and solvent components in a chemical container according to proportion and stir and mix them to obtain a positive electrode active material slurry; Step 2: Coating: Coating the positive electrode active material slurry on the positive electrode current collector through a coating device; Step 3: Drying: Drying the positive electrode current collector coated with the positive electrode active material slurry to obtain a crude positive electrode active material layer; Step 4: Cold pressing: cold pressing the dried crude positive electrode active material layer to obtain a positive electrode active material layer; The coating equipment involved in the coating process in step 2 includes a base plate and a coating unit, wherein the coating unit is arranged at the upper end of the base plate, and the coating unit includes two support plates symmetrically installed on the upper end of the base plate in front and back, and a limiting roller is connected to the two support plates in a common rotation. A discharge frame connected to the two support plates is provided on the left side of the limiting roller, and a coating roller is rotatably connected in the discharge frame; A tensioning unit is arranged on the right side of the coating unit and connected to the base plate, the tensioning unit includes two support rods symmetrically installed at the upper end of the base plate, an angle adjustment component is installed between the two support rods, a U-shaped plate with an opening facing the coating unit is installed on the angle adjustment component, and a clamping component is connected inside the U-shaped plate; A guide unit is provided on the right side of the tensioning unit and connected to the base plate. The guide unit includes a positioning frame with a U-shaped structure and an opening downwardly mounted on the upper end of the base plate. Sliding holes are provided on two vertical sections of the positioning frame. A lifting component is commonly connected to the two sliding holes. A traction roller is connected to the lifting component. Two limiting components connected to the lifting component are symmetrically provided front and back above the traction roller. The upper end of the lifting plate is rotatably connected to the rotating screw, and the rotating screw is threadedly connected to the hole wall of the adjusting through hole on the front side. A guide column is installed on the upper end of the lifting plate on the rear side, and the guide column slides through the hole wall of the adjusting through hole on the rear side. Two clamping assemblies are symmetrically arranged up and down inside the U-shaped plate, and the clamping assembly located on the upper side is installed between the two lifting plates, and the clamping assembly located at the lower side is fixedly connected to the inner end of the vertical section of the U-shaped plate, and the front end of the U-shaped plate is fixedly connected to a driving motor, and the output shaft of the driving motor passes through the vertical section of the U-shaped plate and is fixedly connected to the clamping assembly located at the lower side.

2. The method for preparing an electrode composite material for a supercapacitor according to claim 1, wherein: The coating unit also includes two distance-adjusting components that are symmetrically distributed front and back and are respectively connected to the corresponding support plates. The distance-adjusting components are connected to the discharge frame. An adjusting screw is connected to any one of the distance-adjusting components, and the adjusting screw is threadedly connected to the corresponding support plate. Two strip rods that are symmetrically distributed left and right and fixedly connected to the two support plates are arranged under the coating roller. A collecting frame is placed together at the upper ends of the two strip rods, and a cleaning brush that is fixedly connected to the two support plates is arranged on the right side of the collecting frame.

3. The method for preparing an electrode composite material for a supercapacitor according to claim 2, wherein: The distance adjustment component includes a rectangular through hole opened on the support plate, and two guide rods are symmetrically installed in the rectangular through hole. A sliding block is slidably connected to the two guide rods. The sliding block is fixedly connected to the discharge frame, and the sliding block is rotatably connected to the coating roller. The adjusting screw is rotatably connected to the left end of the corresponding sliding block.

4. The method for preparing an electrode composite material for a supercapacitor according to claim 1, wherein: The angle adjustment component includes a guide block installed between the two support rods, an arc-shaped through hole is opened in the guide block, an arc rod is slidably connected in the arc-shaped through hole, the upper end of the arc rod is fixedly connected to the U-shaped plate, a connecting spring is installed between the U-shaped plate and the guide block, a guide countersunk hole is opened on the outer arc hole wall of the arc-shaped through hole, a limit plate is slidably connected in the guide countersunk hole, and a feed screw is rotatably connected to the end of the limit plate away from the arc rod, and the feed screw is threadedly connected to the guide block.

5. The method for preparing an electrode composite material for a supercapacitor according to claim 1, wherein: The guide unit also includes two rectangular blocks that are symmetrically distributed front to back and are respectively installed at the right ends of the two vertical sections of the positioning frame. A rotating roller is connected to rotate together between the two rectangular blocks, and two annular openings are symmetrically opened front to back on the annular surface of the rotating roller.

6. The method for preparing an electrode composite material for a supercapacitor according to claim 1, characterized in that: The lifting component includes a lifting screw threadedly connected to the middle section of the positioning frame, the lower end of the lifting screw is rotatably connected to the lifting frame, the lifting frame is U-shaped and the opening is facing downward, the two vertical sections of the lifting frame are respectively rotatably sleeved on the two ends of the traction roller, and the outer end of the vertical section of the lifting frame is equipped with a moving block rotatably sleeved on the end of the traction roller, and the moving block is slidably connected to the sliding through hole.

7. The method for preparing an electrode composite material for a supercapacitor according to claim 6, characterized in that: The limiting component includes a limiting screw threadedly connected to the middle section of the lifting frame, the lower end of the limiting screw is rotatably connected to an arc plate, the outer arc surface of the arc plate is installed with a guide rod that slides through the middle section of the lifting frame, and the inner arc surface of the arc plate is rotatably connected to a plurality of evenly distributed rotating rods.

8. The method for preparing an electrode composite material for a supercapacitor according to claim 1, wherein: The clamping assembly includes a conveyor belt. The upper conveyor belt is installed between the two lifting plates. The lower conveyor belt is connected to the inner end of the vertical section of the U-shaped plate. A plurality of evenly distributed rubber sleeves are installed on the outer surface of the conveyor belt.

9. The method for preparing an electrode composite material for a supercapacitor according to claim 1, wherein: A baffle plate rotatably sleeved on the middle of the coating roller is vertically installed in the middle of the material discharging frame.

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