Double-sided coating equipment

Abstract

The utility model discloses double-sided coating equipment which comprises a rack, and an unwinding device, a dipping material box, a scraping device and a winding device which are arranged on the rack, a base material is arranged on the unwinding device, and the base material sequentially penetrates through the dipping material box and the scraping device and then is wound on the winding device; the scraping device comprises two scraping rollers which are arranged at an interval, a scraping gap is formed between the two scraping rollers, and the base material penetrates through the scraping gap; and each scraping roller is movably arranged in the width direction of the scraping gap so as to change the width of the scraping gap. Due to the fact that the width of the scraping gap is adjustable, when the thickness of the electrode coating needs to be changed, the purpose of increasing or reducing the width of the scraping gap is achieved by moving the scraping roller along the width of the scraping gap, so that the electrode coatings with different thicknesses are prepared, the production cost caused by replacing a measuring instrument is avoided, meanwhile, the working procedure of replacing the measuring instrument is reduced, and the working efficiency is improved. Therefore, the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a double-sided coating device. Background Art

[0002] In the production process of lithium batteries, the coating process is a key step, and the coating quality directly affects the performance and quality of the batteries. The double-sided dip coating machine is an important device to realize this process. It forms the positive / negative electrode sheets of the battery by uniformly coating the electrode material on the substrate. However, the coating thickness measuring instruments used in the existing double-sided dip coating machines are usually simply designed and can only meet the coating requirements of a single thickness. When the production demand changes and it is necessary to produce electrode coatings with different thicknesses, the corresponding measuring instruments must be replaced. This not only increases the production cost but also significantly reduces the production efficiency. Summary of the Utility Model

[0003] An embodiment of the utility model provides a double-sided coating device, which can quickly adjust and meet the requirements of different coating thicknesses, without the need to frequently replace the measuring instruments, significantly improving the production efficiency of lithium batteries and reducing the production cost.

[0004] Specifically, the utility model provides a double-sided coating device, which includes a frame and a unwinding device, an impregnation material box, a scraping device and a winding device arranged on the frame. A substrate is arranged on the unwinding device, and the substrate passes through the impregnation material box and the scraping device in sequence and is wound on the winding device; the scraping device includes two scraping rollers arranged at intervals to form a scraping gap between the two scraping rollers, and the substrate passes through the scraping gap; each scraping roller is movably arranged along the width direction of the scraping gap to change the width of the scraping gap.

[0005] Optionally, the scraping device further includes:

[0006] A fixed frame, which is installed on the frame;

[0007] Two first driving members and two second driving members. The first driving member is arranged on the fixed frame, and the second driving member is movably arranged on the fixed frame. The output end of each second driving member is connected to one of the scraping rollers, and the first driving member is connected to the second driving member to drive the second driving member to move along the width direction of the scraping gap.

[0008] Optionally, the scraping device further includes:

[0009] A slide rail, which is arranged on the fixed frame and extends along the width direction of the scraping gap;

[0010] A slider, which is movably arranged on the slide rail, and the second driving member is slidably connected to the slide rail through the slider; the first driving member is connected to the slider and is used to drive the slider to move along the slide rail.

[0011] Optionally, the scraping device further includes:

[0012] A scraper, which is arranged on the fixed frame and is located on one side of one scraping roller away from the other scraping roller; the scraper is located above the impregnating material box;

[0013] A dial indicator, which is arranged on the fixed frame and is located on the side of the scraping gap away from the slider, and the probe of the dial indicator abuts against the slider.

[0014] Optionally, the unwinding device and / or the winding device includes:

[0015] A support, which is arranged on the frame;

[0016] A third driving member, which is arranged on the frame;

[0017] A reel, which is rotatably arranged on the support, and one end of the reel is connected to the output end of the third driving member; a part of the base material is wound on the reel.

[0018] Optionally, a first tension control device is arranged between the unwinding device and the impregnating material box, and a second tension control device is arranged between the scraping device and the winding device; both the first tension control device and the second tension control device are used to control the tension of the base material;

[0019] The first tension control device and / or the second tension control device includes:

[0020] A tension frame, which is rotatably arranged on the frame, and an eccentric wheel is arranged on the tension frame;

[0021] A tension roller, which is rotatably arranged on the tension frame, and the central axis of the tension roller is spaced from the rotation axis of the tension frame; the base material passes around the tension roller;

[0022] A telescopic assembly, which has a fixed end and a mobile end, the fixed end is connected to the frame, and the mobile end is hinged to the crank of the eccentric wheel. The mobile end approaches or moves away from the fixed end in the vertical direction to drive the eccentric wheel to rotate.

[0023] Optionally, a driving assembly is provided between the unwinding device and the first tension control device, and the driving assembly is used to control the running speed of the base material; the driving assembly includes:

[0024] A driving frame which is arranged on the machine frame;

[0025] A fourth driving member which is arranged on the driving frame;

[0026] A main driving shaft, one end of which is connected to the output end of the fourth driving member, and the other end of which is rotatably connected to the driving frame;

[0027] An upper pressing shaft which is rotatably arranged on the driving frame and is arranged at an interval from the main driving shaft to form a driving gap; the base material passes through the driving gap, and both sides of the base material are respectively abutted against the upper pressing shaft and the main driving shaft.

[0028] Optionally, a drying device is provided between the scraping device and the second tension control device, and the drying device is used to dry the base material; the drying device includes:

[0029] A drying box, with a drying inlet and a drying outlet respectively arranged at both ends of the drying box, and the base material passes through the drying inlet and the drying outlet in sequence; an infrared heating module is arranged in the drying box;

[0030] An exhaust fan which is communicated with the drying box and is used to extract the gas in the drying box.

[0031] Optionally, a deviation rectifying device is provided between the winding device and the second tension control device, and the deviation rectifying device is used to move the base material when the base material deviates.

[0032] Optionally, the impregnation material box includes:

[0033] A feeding box which contains impregnation slurry; two openings are arranged at the upper end of the feeding box;

[0034] An impregnation roller which is rotatably arranged in the feeding box and is located in the impregnation slurry.

[0035] The beneficial effects of the present utility model are as follows:

[0036] In the double-sided coating equipment provided by the present utility model, since the width of the scraping gap is adjustable, when it is necessary to change the thickness of the electrode coating, by moving another scraping roller radially along one scraping roller, the width of the scraping gap is changed, so as to prepare electrode coatings with different thicknesses, avoiding the production cost caused by replacing measuring instruments, and at the same time reducing the process of replacing measuring instruments, so the production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 is a schematic structural diagram of a double-sided coating device in an embodiment of the present invention;

[0039] Figure 2 is a schematic front view of a double-sided coating device in an embodiment of the present invention;

[0040] Figure 3 is a schematic structural diagram of a scraping device in a double-sided coating device in an embodiment of the present invention;

[0041] Figure 4 is Figure 3 a schematic enlarged view of part A in;

[0042] Figure 5 is a schematic partial structural diagram of a scraping device in a double-sided coating device in an embodiment of the present invention;

[0043] Figure 6 is a schematic structural diagram of a unwind device / wind-up device in a double-sided coating device in an embodiment of the present invention;

[0044] Figure 7 is a schematic structural diagram of a first tension control device / second tension control device in a double-sided coating device in an embodiment of the present invention;

[0045] Figure 8 is a schematic structural diagram of a driving component in a double-sided coating device in an embodiment of the present invention;

[0046] Figure 9 is a schematic structural diagram of an impregnation cartridge in a double-sided coating device in an embodiment of the present invention;

[0047] Figure 10 is a schematic structural diagram of an impregnation cartridge in a double-sided coating device in an embodiment of the present invention;

[0048] Figure 11 is a schematic structural diagram of a drying device in a double-sided coating device in an embodiment of the present invention;

[0049] Figure 12 is a schematic structural diagram of a deviation rectifying device in a double-sided coating device in an embodiment of the present invention.

[0050] In the figure: 100 is the frame, 910 is the operation button, 920 is the human-machine operation interface, 1000 is the base material, 201 is the unwinding device, 202 is the rewinding device, 210 is the support, 220 is the third driving member, 230 is the reel, 300 is the impregnating material box, 310 is the feeding box, 311 is the opening, 320 is the impregnating roller, 330 is the fifth driving member, 400 is the scraping device, 410 is the scraping roller, 420 is the fixed frame, 421 is the limiting hole, 430 is the second driving member, 440 is the slide rail, 450 is the slider, 460 is the scraper, 470 is the micrometer, 471 is the measuring head, 480 is the first driving member, 481 is the piston rod, 482 is the connecting block, 490 is the scraping gap, 501 is the first tension control device, 502 is the second tension control device, 510 is the tension frame, 520 is the tension roller, 530 is the telescopic assembly, 540 is the angle sensor, 550 is the counterweight, 560 is the eccentric wheel, 561 is the crank, 600 is the driving assembly, 610 is the driving frame, 620 is the fourth driving member, 630 is the main driving shaft, 640 is the upper pressing shaft, 700 is the drying device, 710 is the drying oven, 711 is the drying outlet, 712 is the infrared heating module, 720 is the exhaust fan, 800 is the deviation rectifying device, 810 is the guide roller, 820 is the deviation rectifying sensor, 830 is the process deviation rectifier. Detailed implementation manners

[0051] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0052] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0053] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0054] Figure 1 is a schematic structural diagram of a double-sided coating device in an embodiment of the present utility model, as Figure 1 shown, and referring to Figures 2 to 12 , an embodiment of the present utility model provides a double-sided coating device, including a frame 100 and a unwind device 201, an impregnation cartridge 300, a scraping device 400, and a winding device 202 provided on the frame 100. A substrate 1000 is provided on the unwind device 201, and the substrate 1000 passes through the impregnation cartridge 300 and the scraping device 400 in sequence and is wound on the winding device 202; the scraping device 400 includes two scraping rollers 410 arranged at intervals to form a scraping gap 490 between the two scraping rollers 410, and the substrate 1000 passes through the scraping gap 490; each scraping roller 410 is movably arranged along the width direction of the scraping gap 490 to change the width of the scraping gap 490.

[0055] In this embodiment, a scraping gap 490 is formed between the two scraping rollers 410. When the substrate 1000 passes through the scraping gap 490, the slurry on the substrate 1000 that exceeds the width of the scraping gap 490 is scraped off by the scraping rollers 410. Since the width of the scraping gap 490 is adjustable, when it is necessary to change the thickness of the electrode coating, by moving the scraping rollers along the width of the scraping gap 490, the purpose of increasing or decreasing the width of the scraping gap 490 is achieved, so as to prepare electrode coatings with different thicknesses, avoid the production cost caused by replacing the measuring instrument, and at the same time reduce the process of replacing the measuring instrument. Therefore, the production efficiency can be improved.

[0056] As Figure 3 , Figure 4As shown, in an embodiment of the present utility model, the scraping device 400 further includes a fixed frame 420, two first driving members 480 and two second driving members 430. The fixed frame 420 is installed on the frame 100. The first driving member 480 is arranged on the fixed frame 420. The second driving member 430 is movably arranged on the fixed frame 420. A scraping roller 410 is connected to the output end of each second driving member 430. The first driving member 480 is connected to the second driving member 430 and is used to drive the second driving member 430 to move along the width direction of the scraping gap 490.

[0057] During application, the second driving member 430 is started to drive the scraping roller 410 to rotate, thereby adhering and removing the excess slurry on the substrate 1000, achieving the purpose of scraping off the excess slurry. When adjusting the width of the scraping gap 490, one second driving member 430 and the scraping roller 410 connected thereto are moved to achieve the purpose of changing the width of the scraping gap 490.

[0058] As Figure 4 、 Figure 5 shown, specifically, the second driving member 430 is a driving motor. The scraping device 400 further includes a slide rail 440 and a slider 450. The slide rail 440 is arranged on the fixed frame 420 and extends along the width direction of the scraping gap 490. The slider 450 is movably arranged on the slide rail 440. The second driving member 430 is slidably connected to the slide rail 440 through the slider 450. The first driving member 480 is connected to the slider 450 and is used to drive the slider 450 to move along the slide rail 440. The slide rail 440 is arranged on one side of the fixed frame 420, and the first driving member 480 is arranged on the other side of the fixed frame 420. A limiting hole 421 with a long-strip-shaped cross-section is formed in the fixed frame 420. The first driving member 480 is a cylinder. A connecting block 482 is connected to the piston rod 481 of the cylinder. The connecting block 482 passes through the limiting hole 421 and is connected to the slider 450, so that the piston rod 481 drives the slider 450 to move through the connecting block 482. With such a setting, the first driving member 480 can drive the slider 450 to move along the width direction of the scraping gap 490, and further drive the second driving member 430 and the scraping roller 410 thereon to move.

[0059] In an embodiment of the present utility model, the scraping device 400 further includes a scraper 460 and a dial indicator 470. The scraper 460 is disposed on the fixed frame 420 and is located on one side of one scraping roller 410 away from the other scraping roller 410; the scraper 460 is located above the impregnating material box 300. During application, the scraper 460 removes the slurry adhered to the scraping roller 410, and the removed slurry falls into the lower impregnating material box 300 for reuse. Further, a plurality of through holes are provided on the scraper 460 to facilitate the slurry to pass through the through holes and fall into the impregnating material box 300. The dial indicator 470 is disposed on the fixed frame 420 and is located on one side of the scraping gap 490 away from the slider 450. The probe 471 of the dial indicator 470 abuts against the slider 450, thereby displaying the real-time width of the scraping gap 490.

[0060] As Figure 6 shown, in an embodiment of the present utility model, the unwinding device 201 and / or the winding device 202 includes a support 210, a third driving member 220 and a reel 230. The support 210 is disposed on the frame 100; the third driving member 220 is disposed on the frame 100; the reel 230 is rotatably disposed on the support 210, and one end of the reel 230 is connected to the output end of the third driving member 220; a part of the base material 1000 is wound on the reel 230. The third driving member 220 is a driving motor. During application, the third driving member 220 drives the reel 230 to rotate to achieve the unwinding / winding action.

[0061] As Figure 2 、 Figure 7As shown, in an embodiment of the present utility model, a first tension control device 501 is provided between the unwinding device 201 and the impregnating material box 300, and a second tension control device 502 is provided between the scraping device 400 and the winding device 202; both the first tension control device 501 and the second tension control device 502 are used to control the tension of the base material 1000. The first tension control device 501 and / or the second tension control device 502 includes a tension frame 510, a tension roller 520, a telescopic assembly 530, an angle sensor 540, and a counterweight 550. The tension frame 510 is rotatably provided on the frame 100, and an eccentric wheel 560 is provided on the tension frame 510; the tension roller 520 is rotatably provided on the tension frame 510, and the central axis of the tension roller 520 is spaced from the central axis of the tension frame 510; the base material 1000 passes around the tension roller 520; the telescopic assembly 530 has a fixed end and a mobile end, the fixed end is connected to the frame 100, and the mobile end is hinged to the crank 561 of the eccentric wheel 560. The mobile end moves closer to or away from the fixed end in the vertical direction to drive the eccentric wheel 560 to rotate. The telescopic assembly 530 is a cylinder, the fixed end is the cylinder barrel, and the mobile end is the piston rod. The angle sensor 540 is fixedly provided on the frame 100, and the probe of the angle sensor 540 abuts against the tension frame 510; the counterweight 550 is provided on the frame 100 and is located on the side of the rotation axis of the tension frame 510 away from the tension roller 520.

[0062] In this embodiment, the base material 1000 passes around the tension roller 520, and the tension roller 520 provides a supporting effect for the base material 1000. If the tension of the base material 1000 is too large or too small, by controlling the telescopic movement of the mobile end of the telescopic assembly 530, the tension frame 510 can be driven to rotate through the eccentric wheel 560, so as to change the position of the tension roller 520, thereby changing the tension of the base material 1000. Since the probe of the angle sensor 540 abuts against the tension frame 510, the angle and real-time position of the tension roller 520 can be feedback. The counterweight 550 and the tension roller 520 are symmetrically arranged on both sides of the rotation axis of the tension frame 510, so that the center of the first tension control device 501 and / or the second tension control device 502 falls on the rotation axis of the tension frame 510, facilitating the rotation of the tension frame 510.

[0063] As Figure 8As shown, in one embodiment of the utility model, a driving assembly 600 is arranged between the unwinding device 201 and the first tension control device 501, and the driving assembly 600 is used to control the tape running speed of the substrate 1000; the driving assembly 600 includes a driving frame 610, a fourth driving member 620, a main driving shaft 630 and an upper pressing shaft 640, the driving frame 610 is arranged on the frame 100, and the fourth driving member 620 is arranged on the driving frame 610; one end of the main driving shaft 630 is connected to the output end of the fourth driving member 620, and the other end is rotatably connected to the driving frame 610; the upper pressing shaft 640 is rotatably arranged on the driving frame 610, and is spaced apart from the main driving shaft 630 to form a driving gap; the substrate 1000 passes through the driving gap, and the two sides of the substrate 1000 are respectively in contact with the upper pressing shaft 640 and the main driving shaft 630. The fourth driving member 620 is a driving motor.

[0064] When in use, the substrate 1000 is clamped between the upper pressure shaft 640 and the main drive shaft 630, and the friction force between the substrate 1000 and the upper pressure shaft 640 and the main drive shaft 630 is used as the power source for the substrate 1000 to travel. The main drive shaft 630 is driven to rotate by the rotation of the fourth driving member 620, thereby driving the substrate 1000 to travel, and the travel speed of the substrate 1000 is controlled by controlling the rotation speed of the fourth driving member 620.

[0065] like Figure 9 , Figure 10 As shown, in one embodiment of the utility model, the impregnation material box 300 includes a discharge box 310, an impregnation roller 320 and a fifth driving member 330, wherein the discharge box 310 contains impregnation slurry; the upper end of the discharge box 310 is provided with two openings 311; each of the openings 311 is located below one of the scrapers 460, so that the slurry falling from the scraper 460 directly falls into the opening 311. The impregnation roller 320 is rotatably arranged in the discharge box 310 and is located in the impregnation slurry. The fifth driving member 330 is arranged on the frame 100, and the fifth driving member 330 is a driving motor, and the fifth driving member 330 is connected to the impregnation roller 320 through a belt. The substrate 1000 enters the discharge box 310 from one opening 311, and leaves the discharge box 310 from another opening 311 after passing through the impregnation roller 320. The substrate 1000 is fully infiltrated with the slurry in the impregnation box 300 to form a coating.

[0066] like Figure 11As shown, in an embodiment of the present utility model, a drying device 700 is provided between the scraping device 400 and the second tension control device 502, and the drying device 700 dries the substrate 1000; the drying device 700 includes a drying box 710 and an exhaust fan 720. Drying inlets and a drying outlet 711 are respectively arranged at both ends of the drying box 710, and the substrate 1000 sequentially passes through the drying inlet and the drying outlet 711; an infrared heating module 712 is arranged in the drying box 710 to heat and dry the slurry infiltrated on both sides of the substrate 1000. The exhaust fan 720 is arranged on one side of the drying box 710 and is communicated with the drying box 710, and is used to extract the gas in the drying box 710 to generate negative pressure in the drying box 710. Under the action of atmospheric pressure, the outside gas enters the drying box 710 through the drying inlet and the drying outlet 711 to form an air flow, so as to quickly dry both sides of the substrate 1000.

[0067] As Figure 12 As shown, in an embodiment of the present utility model, a deviation rectifying device 800 is provided between the winding device 202 and the second tension control device 502, and the deviation rectifying device 800 is used to move the substrate 1000 when the substrate 1000 deviates. The deviation rectifying device 800 includes a guide roller 810, a deviation rectifying sensor 820 and a process deviation rectifier 830. The number of the guide rollers 810 is four, and the four guide rollers 810 are distributed at the endpoints of a preset rectangle; the substrate 1000 sequentially winds around the guide roller 810; a deviation rectifying sensor 820 and a process deviation rectifier 830 are arranged between the four guide rollers 810. Before the substrate 1000 is wound, it first winds around the guide roller 810 and passes through the process deviation rectifier 830. When the substrate 1000 deviates, the deviation rectifying sensor 820 feeds back a signal to the controller to automatically pull (drag) the substrate 1000 to the correct position.

[0068] In an embodiment of the present utility model, a control board is installed in the frame 100. The control board stores the operating parameters of the second driving member 430, the third driving member 220, the fourth driving member 620, the fifth driving member 330, the drying box 710, the exhaust fan 720 and the process deviation rectifier 830, and acquires the data monitored by the dial indicator 470, the angle sensor 540 and the deviation rectifying sensor 820. A human-machine operation interface 920 and an operation button 910 are arranged on the frame 100. The human-machine operation interface 920 is communicatively connected with the control board, so that a user can set the parameters required for the operation of the device through the human-machine operation interface 920, monitor and record the device data, and quickly control the start and stop of the device through the operation button 910.

[0069] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A double-sided coating device, characterized in that: It includes a frame and an unwinding device, an impregnation material box, a scraping device and a winding device arranged on the frame. The unwinding device is provided with a substrate, and the substrate passes through the impregnation material box and the scraping device in sequence and is then wound on the winding device; the scraping device includes two scraping rollers arranged at intervals to form a scraping gap between the two scraping rollers, and the substrate passes through the scraping gap; each scraping roller is movably arranged along the width direction of the scraping gap to change the width of the scraping gap.

2. The double-sided coating device according to claim 1, characterized in that: The scraping device also includes: A fixing frame, wherein the fixing frame is installed on the frame; Two first driving members and two second driving members, the first driving members are arranged on the fixed frame, the second driving members are movably arranged on the fixed frame, each output end of the second driving member is connected to a scraper roller, the first driving member is connected to the second driving member, and is used to drive the second driving member to move along the width direction of the scraping gap.

3. The double-sided coating device according to claim 2, characterized in that: The scraping device also includes: A slide rail, the slide rail is arranged on the fixed frame and extends along the width direction of the scraping gap; A slider is movably arranged on the slide rail, and the second driving member is slidably connected to the slide rail through the slider; the first driving member is connected to the slider and is used to drive the slider to move along the slide rail.

4. The double-sided coating device according to claim 3, characterized in that: The scraping device also includes: A scraper, the scraper is arranged on the fixed frame and is located on a side of one of the scraper rollers away from the other scraper roller; the scraper is located above the impregnation material box; A micrometer is arranged on the fixed frame and is located on a side of the scraping gap away from the sliding block, and a probe of the micrometer abuts against the sliding block.

5. The double-sided coating device according to claim 1, characterized in that: The unwinding device and / or the rewinding device comprises: A support, wherein the support is arranged on the frame; a third driving member, the third driving member being arranged on the frame; A reel is rotatably disposed on the support, one end of the reel is connected to the output end of the third driving member; the substrate is partially rolled up on the reel.

6. The double-sided coating device according to claim 1, characterized in that: A first tension control device is provided between the unwinding device and the impregnation material box, and a second tension control device is provided between the scraping device and the winding device; the first tension control device and the second tension control device are both used to control the tension of the substrate; The first tension control device and / or the second tension control device comprises: A tension frame, the tension frame is rotatably arranged on the frame, and an eccentric wheel is provided on the tension frame; A tension roller, the tension roller is rotatably arranged on the tension frame, the central axis of the tension roller is spaced apart from the rotation axis of the tension frame; the substrate is wound around the tension roller; The telescopic component has a fixed end and a movable end, wherein the fixed end is connected to the frame, the movable end is hinged to the crank of the eccentric wheel, and the movable end approaches or moves away from the fixed end in the vertical direction to drive the eccentric wheel to rotate.

7. The double-sided coating device according to claim 6, characterized in that: A driving assembly is provided between the unwinding device and the first tension control device, and the driving assembly is used to control the tape travel speed of the substrate; the driving assembly comprises: A driving frame, wherein the driving frame is arranged on the frame; a fourth driving member, wherein the fourth driving member is disposed on the driving frame; A main drive shaft, one end of which is connected to the output end of the fourth drive member, and the other end of which is rotatably connected to the drive frame; An upper pressing shaft is rotatably arranged on the driving frame and is spaced apart from the main driving shaft to form a driving gap; the substrate passes through the driving gap, and two sides of the substrate are respectively in contact with the upper pressing shaft and the main driving shaft.

8. The double-sided coating device according to claim 6, characterized in that: A drying device is provided between the scraping device and the second tension control device, and the drying device is used to dry the substrate; the drying device comprises: A drying box, wherein a drying inlet and a drying outlet are respectively provided at both ends of the drying box, and the substrate passes through the drying inlet and the drying outlet in sequence; an infrared heating module is provided in the drying box; An exhaust fan is connected to the drying box and is used to extract the gas in the drying box.

9. The double-sided coating device according to claim 6, characterized in that: A deviation correction device is arranged between the winding device and the second tension control device, and the deviation correction device is used to move the substrate when the substrate deviates.

10. The double-sided coating device according to claim 1, characterized in that: The impregnation material box comprises: A discharge box, in which the impregnation slurry is placed; the upper end of the discharge box is provided with two openings; The impregnation roller is rotatably arranged in the material discharge box and is located in the impregnation slurry.

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