An apparatus and method for preparing carbon-coated foil

Abstract

This invention discloses a device for preparing carbon-coated foil, comprising: a conveying unit, a spraying unit, a drying unit, an adjustment component, a thickness measuring component, a humidity detection component, and a controller. This invention can measure the coating thickness on the foil in real time. Based on the actual coating thickness, it selects the corresponding distance between the hot air duct and the foil from a lookup table as the input distance. The controller adjusts the actual distance between the hot air duct and the foil, thereby adjusting the hot air action on the coating according to different coating thicknesses and improving the drying effect. This invention can also control the simultaneous operation of hot air drying and electric heating drying, or hot air drying only, based on the coating humidity and a set humidity threshold. For coatings with high humidity, dual drying is performed to improve drying efficiency; for coatings with low humidity, only hot air drying is performed to avoid rapid coating curing that could affect battery performance and ensure product quality.

Description

Technical Field

[0001] This invention relates to the field of carbon foil technology, specifically to an apparatus and method for preparing carbon foil. Background Technology

[0002] Carbon-coated foil is a composite foil material in which a conductive paste coating is applied to an aluminum or copper current collector to reduce battery impedance, enhance coating adhesion strength, reduce the amount of binder and conductive agent used, improve battery cycle life, and enhance the oxidation resistance of the current collector.

[0003] During the preparation of carbon-coated foil, the coating curing process directly determines the final battery performance. If the curing process is improper, the contact resistance at the carbon-coated foil interface in the finished battery will increase significantly. This is because the rapid heating during the curing process causes the conductive paste to evaporate quickly, or the rapid drop in temperature causes the conductive paste to solidify before it is fully dispersed, resulting in uneven coating distribution and thus affecting battery performance. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for preparing carbon-coated foil to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An apparatus for preparing carbon-coated foil, comprising:

[0007] A conveying unit is used to convey foil sheets;

[0008] The spraying unit is used to spray conductive paste onto both sides of the foil.

[0009] The drying unit includes a first drying component and a second drying component, used to dry and cure the coating on the foil;

[0010] An adjustment component is used to adjust the distance between the output end of the second drying component and the foil.

[0011] Thickness measuring component, used to measure coating thickness;

[0012] Humidity detection components are used to measure the humidity of the coating; and

[0013] The controller is electrically connected to the conveying unit, spraying unit, thickness measuring component, humidity detection component, regulating component, and drying unit.

[0014] The controller is used to obtain the coating thickness and look up the corresponding hot air pipe and foil input distance according to the preset coating thickness-hot air pipe and foil distance lookup table. Then it obtains the current distance between the output end of the second drying component and the foil and compares it with the input distance.

[0015] If the current distance is less than the input distance, the controller controls the adjustment component to increase the distance between the output end of the second drying component and the foil until the input distance is reached; if the current distance is greater than the input distance, the controller controls the adjustment component to decrease the distance between the output end of the second driving component and the foil until the input distance is reached.

[0016] The controller is also used to acquire the coating humidity and compare the coating humidity with a set humidity threshold.

[0017] If the coating humidity is greater than the set humidity threshold, the controller controls the first drying component and the second drying component to turn on simultaneously; if the coating humidity is less than or equal to the set humidity threshold, the controller controls the first drying component to turn off and the second drying component to turn on.

[0018] As a further aspect of the present invention: the conveying unit includes:

[0019] Unwind reel;

[0020] Rewind reel; and

[0021] A take-up motor, which drives the take-up reel;

[0022] The foil is wound around the unwinding and rewinding reels at both ends.

[0023] As a further aspect of the present invention: the spraying unit includes:

[0024] The storage tank is used to store conductive paste, and a conveying pump is installed inside the storage tank;

[0025] Hollow connecting frames are symmetrically arranged on the upper and lower side walls of the storage box;

[0026] The spraying plate is installed at the end of the hollow connecting frame away from the storage box, and several spray nozzles are provided on the end face of the spraying plate facing the foil.

[0027] As a further embodiment of the present invention: the drying unit further includes a drying box, with an inlet and an outlet on both sides of the drying box, and the first drying component and the second drying component are disposed inside the drying box;

[0028] The first drying component is located near the inlet, and the second drying component is located near the outlet.

[0029] As a further aspect of the present invention: the first drying component includes a mounting frame and an electric heating tube, the mounting frame being fixed between the inner walls of both sides of the drying chamber, and the electric heating tube being mounted on the mounting frame.

[0030] As a further aspect of the present invention: the second drying component includes a hot air blower and two sets of hollow connecting pipes, wherein the hot air blower is fixedly installed on the outer wall of the drying chamber, and two flexible connecting pipes are connected to the hot air blower. The end of each flexible connecting pipe away from the hot air blower is connected to the corresponding hollow connecting pipe. The two sets of hollow connecting pipes are located above and below the foil, respectively, and several hot air pipes are equidistantly arranged on the end face of the hollow connecting pipes facing the foil.

[0031] As a further embodiment of the present invention: the adjustment assembly includes an adjustment motor, two sets of slide rails and two sets of sliding plates. The adjustment motor is installed on the side wall of the drying oven, and a gear is installed on the output shaft of the adjustment motor. The two sets of slide rails are symmetrically distributed on both sides of the gear. The slide rails are fixed on the inner wall of the drying oven. A sliding plate is slidably arranged on each set of slide rails. The two sets of sliding plates are respectively fixedly connected to the corresponding hollow connecting pipes. A rack is provided on the sliding plate, and the rack meshes with the gear.

[0032] As a further aspect of the present invention: the thickness measuring component includes a bracket, on which two sets of thickness gauges are mounted, and the two sets of thickness gauges are symmetrically distributed on the upper and lower sides of the foil.

[0033] As a further aspect of the present invention: the humidity detection component includes a humidity detector, which is disposed at the inlet of the drying oven.

[0034] This invention also discloses a method for preparing carbon-coated foil, which is applied to the above-mentioned apparatus for preparing carbon-coated foil, and includes the following steps:

[0035] Step 1: The conveying unit feeds and conveys the foil sheets;

[0036] Step 2: The spraying unit sprays conductive paste onto both sides of the foil.

[0037] Step 3: The thickness measuring component measures the coating thickness, and the humidity detection component measures the coating humidity;

[0038] Step 4: The controller obtains the coating thickness, then queries the corresponding input distance between the hot air pipe and the foil according to the preset coating thickness-hot air pipe and foil distance comparison table, and then obtains the current distance between the output end of the second drying component and the foil and compares it with the input distance.

[0039] If the current distance is less than the input distance, the controller controls the adjustment component to increase the distance between the output end of the second drying component and the foil until the input distance is reached; if the current distance is greater than the input distance, the controller controls the adjustment component to decrease the distance between the output end of the second drying component and the foil until the input distance is reached.

[0040] Step 5: The controller acquires the coating humidity and compares it with the set humidity threshold.

[0041] If the coating humidity is greater than the set humidity threshold, the controller controls the first drying component and the second drying component to turn on simultaneously; if the coating humidity is less than or equal to the set humidity threshold, the controller controls the first drying component to turn off and the second drying component to turn on.

[0042] Step 6: The drying unit dries and cures the coating on the foil.

[0043] Step 7: The conveying unit collects the foil sheets after the coating has cured.

[0044] The beneficial effects of this invention are:

[0045] This invention includes a thickness measuring component that can measure the coating thickness on the foil in real time. By consulting a preset coating thickness-hot air pipe-foil distance reference table, the corresponding hot air pipe-foil distance can be selected as the input distance based on the actual coating thickness. The controller adjusts the actual distance between the hot air pipe and the foil to achieve the input distance, thereby adjusting the hot air effect on the coating according to different coating thicknesses. This ensures uniform and consistent heating of the coating, stabilizes the coating curing process, improves the dispersion of conductive paste in the coating, and ultimately enhances the performance of the finished battery.

[0046] This invention incorporates a humidity detection component that can measure the humidity of the coating on the foil in real time. The controller can control the simultaneous activation of hot air drying and electric heating drying or hot air drying only, based on the coating humidity and the set humidity threshold. For coatings with high humidity, dual drying is performed to improve drying efficiency; for coatings with low humidity, only hot air drying is performed to prevent the coating from curing too quickly and affecting battery performance, thus ensuring product quality. Attached Figure Description

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] Figure 1 The stereoscopic view of the present invention Figure 1 ;

[0049] Figure 2 The stereoscopic view of the present invention Figure 2 ;

[0050] Figure 3 This is a schematic diagram of the internal structure of the drying oven in this invention;

[0051] Figure 4 This is a schematic diagram of the process of the present invention.

[0052] In the diagram: 1. Base plate; 2. First support frame; 3. Second support frame; 4. Unwinding roller; 5. Rewinding roller; 6. Foil sheet; 7. Rewinding motor; 8. Storage box; 9. Hollow connecting frame; 10. Spraying plate; 11. Spray nozzle; 12. Drying oven; 13. Inlet; 14. Outlet; 15. Hollow connecting pipe; 16. Hot air duct; 17. Flexible connecting pipe; 18. Hot air blower; 19. Support leg; 20. Mounting frame; 21. Heating element; 22. Bracket; 23. Thickness gauge; 24. Humidity detector; 25. Controller; 26. Gear; 27. Adjusting motor; 28. Slide rail; 29. ​​Slide plate; 30. Rack. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Example 1

[0055] Please see Figure 1 and Figure 2 As shown, this embodiment discloses a carbon-coated foil preparation apparatus, including a base plate 1, a conveying unit, a spraying unit, a thickness measuring component, a humidity detection component, an adjustment component, a drying unit, and a controller 25.

[0056] In this embodiment, the conveying unit is used to convey the foil sheet 6. Specifically, the conveying unit includes an unwinding roller 4 and a winding roller 5. The unwinding roller 4 is rotatably mounted on the base plate 1 via a first support frame 2, and the winding roller 5 is rotatably mounted on the base plate 1 via a second support frame 3. The two ends of the foil sheet 6 are wound around the unwinding roller 4 and the winding roller 5, respectively. A winding motor 7 for driving the winding roller 5 is mounted on the second support frame 3. Specifically, by driving the winding roller 5 to rotate via the winding motor 7, the foil sheet 6 can be wound onto the winding roller 5, while the unwinding roller 4 is passively unwound synchronously, thereby realizing the conveying of the foil sheet 6. During the conveying process, the foil sheet 6 is sequentially sprayed with conductive paste and dried using a spraying unit and a drying unit. Subsequently, the sprayed and dried foil sheet 6 is uniformly wound onto the winding roller 5. Of course, the conveying unit is not limited to the above structure; it can also be conveyed via a slide table or a conveyor chain.

[0057] In this embodiment, please refer to Figure 1 and Figure 2As shown, the spraying unit is used to spray conductive paste onto both sides of the foil 6. The spraying unit is located on the side of the base plate 1 near the unwinding reel 4. Specifically, the spraying unit includes a storage tank 8, a hollow connecting frame 9, and a spraying plate 10. The storage tank 8 is mounted on the base plate 1 and is used to store conductive paste. The upper and lower side walls of the storage tank 8 are connected to the hollow connecting frame 9. A delivery pump (not shown in the figure) is installed inside the storage tank 8. The delivery pump pumps the conductive paste in the storage tank 8 to the hollow connecting frame 9 at the upper and lower ends. The spraying plate 10 is installed at the end of the hollow connecting frame 9 away from the storage tank 8. Several nozzles 11 are provided on the end face of the spraying plate 10 facing the foil 6. Specifically, the conductive paste in the storage tank 8 is pumped to the spraying plate 10 through the hollow connecting frame 9 by the delivery pump, and then sprayed out from each nozzle 11, thereby coating the surface of the foil 6 with conductive paste.

[0058] It should be noted that the two spray plates 10 are located directly above and below the foil 6, respectively. The arrangement direction of each nozzle 11 on the spray plate 10 is perpendicular to the feeding direction of the foil 6. Moreover, the distance between the nozzles 11 at both ends of the spray plate 10 is greater than the width of the foil 6, so that the conductive paste sprayed by each nozzle 11 can cover the entire surface of the foil 6, ensuring uniform coating and avoiding dead corners.

[0059] In this embodiment, please refer to Figure 1 and Figure 3 As shown, the drying unit is used to dry the foil 6 coated with conductive paste. The drying unit is located on the side near the winding reel 5. Specifically, the drying unit includes a drying chamber 12, which is fixed to the base plate 1 by support legs 19. The drying chamber 12 has an inlet 13 and an outlet 14 on both sides. The foil 6 passes through the drying chamber 12, entering from the inlet 13 and exiting from the outlet 14. The drying chamber 12 is equipped with a first drying component and a second drying component, wherein the first drying component is located near the inlet 13 and the second drying component is located near the outlet 14. The first drying component and the second drying component can be turned on simultaneously or separately without interfering with each other. Specifically, the specific form of the first drying component is not limited; it can be hot air drying, electric heating drying, or other forms of drying. In this embodiment, the first drying component includes a mounting frame 20 and an electric heating tube 21. The mounting frame 20 is fixed between the inner walls on both sides of the drying chamber 12, and the electric heating tube 21 is mounted on the mounting frame 20. When the first drying component is turned on, the heating tube 21 emits heat radiation, thereby drying the conductive paste coated on the foil 6.

[0060] It should be noted that the arrangement direction of the heating tubes 21 is perpendicular to the feeding direction of the foil 6, and the length of the heating tubes 21 is greater than the width of the foil 6, so as to ensure that the entire foil 6 can be covered by heat radiation when it passes through the first drying component.

[0061] Furthermore, the specific structure of the second drying component is not limited; it can also be hot air drying, electric heating drying, or other forms of drying. In this embodiment, the second drying component includes a hot air blower 18 and two sets of hollow connecting pipes 15. The hot air blower 18 is fixedly installed on the outer wall of the drying chamber 12. Two flexible connecting pipes 17 are connected to the hot air blower 18. The end of each flexible connecting pipe 17 away from the hot air blower 18 is connected to the corresponding hollow connecting pipe 15. The two sets of hollow connecting pipes 15 are located above and below the foil 6, respectively. Several hot air pipes 16 are equidistantly arranged on the end face of the hollow connecting pipes 15 facing the foil 6. Specifically, the hot air blows out hot air from the hot air blower 18, which enters the hollow connecting pipes 15 through the flexible connecting pipes 17 and is sprayed out from each hot air pipe 16, thereby performing hot air drying treatment on the conductive paste coated on the foil 6.

[0062] In addition, the drying chamber 12 is also equipped with an adjustment component for driving the movement of the second drying component. The drying effect is adjusted by adjusting the distance between the hot air pipe 16 and the foil 6 in the second driving component. Specifically, the adjustment component includes an adjustment motor 27, two sets of slide rails 28 and two sets of sliding plates 29. The adjustment motor 27 is installed on the side wall of the drying chamber 12. A gear 26 is installed on the output shaft of the adjustment motor 27. The two sets of slide rails 28 are symmetrically distributed on both sides of the gear 26. The slide rails 28 are fixed to the inner wall of the drying chamber 12. A sliding plate 29 is slidably installed on each set of slide rails 28. The two sets of sliding plates 29 are fixedly connected to the corresponding hollow connecting pipes 15. A rack 30 is installed on the sliding plate 29, and the rack 30 meshes with the gear 26. Specifically, the adjustment motor 27 drives the gear 26 to rotate, and the gear 26 meshes with the racks 30 on both sides to drive the slide plates 29 on both sides to slide vertically in the corresponding slide rails 28, thereby driving the hollow connecting pipes 15 on the upper and lower sides to move vertically. The two hollow connecting pipes 15 move closer or further away at the same time, thereby realizing the adjustment of the distance between the hot air pipe 16 and the surface of the foil 6. The greater the distance, the lower the heat of drying the foil 6 is received by the hot air, and vice versa.

[0063] It should be noted that when adjusting the distance between the hot air pipe 16 and the foil 6, since the linear distance of the slide plate 29 is proportional to the number of rotations of the output shaft of the adjusting motor 27, the specific proportional coefficient is determined according to the actual application and component selection. It is only necessary to control the number of rotations of the output shaft of the adjusting motor 27 to indirectly control the linear distance of the slide plate 29. The above are all common technical means in the prior art, and will not be elaborated here.

[0064] Of course, the adjustment component can also take other forms, such as driving the hollow connecting pipes 15 on the upper and lower sides to move by means of cylinders or connecting rods, which can also realize the adjustment of the distance between the hot air pipe 16 and the surface of the foil 6.

[0065] In this embodiment, please refer to Figure 1 As shown, a thickness measuring component is installed between the spraying unit and the drying unit. This component measures the thickness of the conductive paste coating on the foil 6. Specifically, the thickness measuring component includes a support 22 and a thickness gauge 23. The support 22 is fixedly mounted on the base plate 1. The support 22 has an F-shaped structure, and two sets of thickness gauges 23 are mounted on it, symmetrically distributed on the upper and lower sides of the foil 6. The specific type of thickness gauge 23 is not limited; it can be a laser thickness gauge or an ultrasonic thickness gauge. Specifically, in this embodiment, the thickness gauge 23 is a Shendawei SW6310A with an accuracy of 0.001 mm.

[0066] Specifically, before measurement, the thickness gauge 23 needs to be zeroed. Before the foil 6 is coated with conductive paste, two thickness gauges 23 are used to measure the distance between themselves and the upper and lower surfaces of the foil 6. The distance between the upper thickness gauge 23 and the upper surface of the foil 6 is recorded as H1, and the distance between the lower thickness gauge 23 and the lower surface of the foil 6 is recorded as H2. The sum of the reference distances is H1 + H2. After the foil 6 is coated with conductive paste, the two thickness gauges 23 measure the distance between themselves and the upper and lower surfaces of the foil 6 in real time. The distance between the upper thickness gauge 23 and the upper surface of the foil 6 is recorded as H11, and the distance between the lower thickness gauge 23 and the lower surface of the foil 6 is recorded as H22. The sum of the actual distances is H11 + H22. Therefore, the difference between the sum of the reference distances and the sum of the actual distances is recorded as the sum of the thicknesses of the coatings on the upper and lower surfaces.

[0067] It should be noted that since the distance between the upper and lower spray plates 10 and the foil 6 is the same, the coating thickness on the upper and lower surfaces of the foil 6 is also the same while ensuring the same amount of coating. In this way, the coating thickness h is half of the difference between the reference distance and the actual distance, that is, h=[(H1+H2)-(H11+H22)] / 2.

[0068] Furthermore, it should be noted that as the take-up reel 5 winds up, the amount of foil on it gradually increases, while the amount of foil 6 on the unwind reel 4 gradually decreases. The height of the foil 6 as it passes through the two coating plates 10 will change slightly. However, because the foil 6 is very thin, this height change will not affect the normal coating process of the coating unit. In other words, the coating plates 10 can always ensure that the coating thickness on the upper and lower surfaces of the foil 6 remains consistent. Additionally, even if the height of the foil 6 changes when it passes through the thickness gauge 23, only the values ​​H11 and H22 will change; the actual distance and H11+H22 will always remain accurate, thus ensuring the accuracy of the measured coating thickness.

[0069] In this embodiment, please refer to Figure 1As shown, the humidity detection component includes a humidity detector 24, which is located at the inlet 13 of the drying chamber 12 and is used to detect the humidity of the coating on the foil 6. The humidity detector 24 can be any commercially available product, as long as it has the function of detecting humidity; specific details are not provided here. Specifically, as the foil 6 passes through the inlet 13, the humidity detector 24 detects the humidity of the coating on the foil 6 and records the specific value.

[0070] In this embodiment, the controller 25 is mounted on the base plate 1, and the controller 25 is electrically connected to the conveying unit, the spraying unit, the thickness measuring component, the humidity detection component, the adjustment component, and the drying unit. The controller 25 is used to acquire the detection data from the thickness measuring component and the humidity detection component and control the operation of the spraying unit, the adjustment component, and the drying unit.

[0071] Specifically, the controller 25 first acquires the coating thickness measured by the thickness measuring component, then looks up the corresponding input distance between the hot air duct and the foil in a preset coating thickness-hot air duct-foil distance lookup table, then acquires the current distance between the hot air duct 16 and the foil 6 inside the drying oven 12, and finally compares the current distance between the hot air duct 16 and the foil 6 with the input distance. The preset coating thickness-hot air duct-foil distance lookup table is set based on practical experience, and the distance between the hot air duct and the foil is inversely proportional to the coating thickness. When the current distance is less than the input distance, the controller 25 drives the upper and lower hollow connecting pipes 15 away from the foil 6 simultaneously through the driving adjustment component, thereby increasing the distance between the hot air duct 16 and the foil 6 until it reaches the input distance; when the current distance is greater than the input distance, the controller 25 drives the upper and lower hollow connecting pipes 15 closer to the foil 6 simultaneously through the driving adjustment component, thereby decreasing the distance between the hot air duct 16 and the foil 6 until it reaches the input distance; when the current distance is exactly equal to the input distance, no operation is performed.

[0072] In addition, the controller 25 is also used to acquire the coating humidity measured by the humidity detection component, and then compare the coating humidity with a set humidity threshold. The set humidity threshold is set based on actual experience. When the coating humidity is greater than the set humidity threshold, the controller 25 controls the hot air blower 18 and the electric heating tube 21 to be turned on simultaneously to perform double drying on the coating on the foil 6; when the coating humidity is less than or equal to the set humidity threshold, the controller 25 controls the hot air blower 18 to be turned on, while the electric heating tube 21 is turned off, and the coating is dried only by hot air.

[0073] In summary, the apparatus for preparing carbon-coated foil in this embodiment has the following advantages:

[0074] The thickness measuring component can measure the coating thickness on the foil 6 in real time. By querying the preset coating thickness-hot air pipe and foil distance reference table, the corresponding hot air pipe and foil distance can be selected as the input distance according to the actual coating thickness. The controller 25 is used to adjust the actual distance between the hot air pipe 16 and the foil 6 to reach the input distance, thereby adjusting the hot air effect on the coating according to different coating thicknesses and improving the drying effect of the coating.

[0075] A humidity detection component is set up to measure the humidity of the coating on the foil 6 in real time. The controller 25 can control the simultaneous activation of hot air drying and electric heating drying or hot air drying only according to the humidity of the coating and the set humidity threshold. For coatings with high humidity, dual drying is performed to improve drying efficiency. For coatings with low humidity, only hot air drying is performed to avoid the coating from curing too quickly and affecting battery performance, thus ensuring product quality.

[0076] Example 2

[0077] Please see Figure 4 As shown, this embodiment provides a method for preparing carbon-coated foil, which is applied to the carbon-coated foil preparation apparatus in Embodiment 1 above. Specifically, it includes the following steps:

[0078] Step 1: The conveying unit feeds and conveys foil sheet 6;

[0079] Step 2: The spraying unit sprays conductive paste onto both sides of foil 6;

[0080] Step 3: The thickness measuring component measures the coating thickness, and the humidity detection component measures the coating humidity;

[0081] Step 4: The controller 25 obtains the coating thickness, then queries the corresponding input distance between the hot air pipe and the foil according to the preset coating thickness-hot air pipe and foil distance comparison table, and then obtains the current distance between the hot air pipe 16 and the foil 6 and compares it with the input distance.

[0082] If the current distance is less than the input distance, the controller 25 controls the adjustment component to increase the distance between the hot air pipe 16 and the foil 6 until the input distance is reached; if the current distance is greater than the input distance, the controller 25 controls the adjustment component to decrease the distance between the hot air pipe 16 and the foil 6 until the input distance is reached.

[0083] Step 5: Controller 25 acquires the coating humidity and compares the coating humidity with the set humidity threshold;

[0084] If the coating humidity is greater than the set humidity threshold, the controller 25 controls the hot air blower 18 and the electric heating tube 21 to turn on simultaneously; if the coating humidity is less than or equal to the set humidity threshold, the controller 25 controls the hot air blower 18 to turn on and the electric heating tube 21 to turn off.

[0085] Step 6: The drying unit dries and cures the coating on foil 6;

[0086] Step 7: The conveying unit collects the foil sheets 6 after the coating has been cured.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An apparatus for preparing carbon-coated foil, characterized in that, include: A conveying unit for conveying foil (6); The spraying unit is used to spray conductive paste onto both sides of the foil (6); The drying unit includes a first drying component and a second drying component for drying and curing the coating on the foil (6); An adjustment component is used to adjust the distance between the output end of the second drying component and the foil (6); Thickness measuring component, used to measure coating thickness; Humidity detection components are used to measure the humidity of the coating; and The controller (25) is electrically connected to the conveying unit, the spraying unit, the thickness measuring component, the humidity detection component, the adjustment component and the drying unit. The controller (25) is used to obtain the coating thickness and look up the corresponding hot air pipe and foil input distance according to the preset coating thickness-hot air pipe and foil distance comparison table. Then, it obtains the current distance between the output end of the second drying component and the foil (6) and compares it with the input distance. If the current distance is less than the input distance, the controller (25) controls the adjustment component to increase the distance between the output end of the second drying component and the foil (6) until the input distance is reached; if the current distance is greater than the input distance, the controller (25) controls the adjustment component to decrease the distance between the output end of the second driving component and the foil (6) until the input distance is reached; the controller (25) is also used to obtain the coating humidity and compare the coating humidity with the set humidity threshold. If the coating humidity is greater than the set humidity threshold, the controller (25) controls the first drying component and the second drying component to turn on simultaneously; if the coating humidity is less than or equal to the set humidity threshold, the controller (25) controls the first drying component to turn off and the second drying component to turn on. The conveying unit includes: Unwinding reel (4); Take-up reel (5); and A take-up motor (7) is used to drive the take-up reel (5); The foil (6) is wound around the unwinding reel (4) and the take-up reel (5) at both ends; the spraying unit includes: Storage tank (8) is used to store conductive paste, and a conveying pump is installed inside the storage tank (8); Hollow connecting frame (9) is symmetrically arranged on the upper and lower side walls of the storage box (8); A spray plate (10) is installed at the end of the hollow connecting frame (9) away from the storage box (8), and a number of spray nozzles (11) are provided on the end face of the spray plate (10) facing the foil (6).

2. The apparatus for preparing carbon-coated foil according to claim 1, characterized in that, The drying unit also includes a drying box (12), with an inlet (13) and an outlet (14) on both sides of the drying box (12), and the first drying component and the second drying component are installed inside the drying box (12); The first drying component is located near the inlet (13), and the second drying component is located near the outlet (14).

3. The apparatus for preparing carbon-coated foil according to claim 2, characterized in that, The first drying component includes a mounting frame (20) and an electric heating tube (21). The mounting frame (20) is fixed between the inner walls on both sides of the drying box (12), and the electric heating tube (21) is installed on the mounting frame (20). The second drying assembly includes a hot air blower (18) and two sets of hollow connecting pipes (15). The hot air blower (18) is fixedly installed on the outer wall of the drying chamber (12). The hot air blower (18) is connected to the corresponding hollow connecting pipe (15) through a flexible connecting pipe (17). The two sets of hollow connecting pipes (15) are located above and below the foil (6) respectively. Several hot air pipes (16) are equidistantly arranged on the end face of the hollow connecting pipe (15) facing the foil (6).

4. The apparatus for preparing carbon-coated foil according to claim 1, characterized in that, The adjustment assembly includes an adjustment motor (27), two sets of slide rails (28) and two sets of sliding plates (29). The adjustment motor (27) is installed on the side wall of the drying box (12). A gear (26) is installed on the output shaft of the adjustment motor (27). The two sets of slide rails (28) are symmetrically distributed on both sides of the gear (26). The slide rails (28) are fixed on the inner wall of the drying box (12). A sliding plate (29) is slidably installed on each set of slide rails (28). The two sets of sliding plates (29) are fixedly connected to the corresponding hollow connecting pipes (15). A rack (30) is installed on the sliding plate (29). The rack (30) meshes with the gear (26).

5. The apparatus for preparing carbon-coated foil according to claim 1, characterized in that, The thickness measuring component includes a bracket (22), on which two sets of thickness gauges (23) are installed, and the two sets of thickness gauges (23) are symmetrically distributed on the upper and lower sides of the foil (6); the humidity detection component includes a humidity detector (24), which is set at the entrance (13) of the drying oven (12).

6. A method for preparing carbon-coated foil, applied to the apparatus for preparing carbon-coated foil according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: The conveying unit feeds the foil sheet (6); Step 2: The spraying unit sprays conductive paste onto both sides of the foil (6); Step 3: The thickness measuring component measures the coating thickness, and the humidity detection component measures the coating humidity; Step 4: The controller (25) obtains the coating thickness, then queries the corresponding hot air pipe and foil input distance according to the preset coating thickness-hot air pipe and foil distance comparison table, and then obtains the current distance between the output end of the second drying component and the foil (6) and compares it with the input distance. If the current distance is less than the input distance, the controller (25) controls the adjustment component to increase the distance between the output end of the second drying component and the foil (6) until the input distance is reached; if the current distance is greater than the input distance, the controller (25) controls the adjustment component to decrease the distance between the output end of the second drying component and the foil (6) until the input distance is reached; Step 5: The controller (25) acquires the coating humidity and compares the coating humidity with the set humidity threshold. If the coating humidity is greater than the set humidity threshold, the controller (25) controls the first drying component and the second drying component to turn on simultaneously; if the coating humidity is less than or equal to the set humidity threshold, the controller (25) controls the first drying component to turn off and the second drying component to turn on. Step 6: The drying unit dries and cures the coating on the foil (6); Step 7: The conveying unit collects the foil sheets (6) after the coating has been cured.

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