Wet surface upward turn-back type double-layer coating equipment and coating method

Abstract

The invention relates to the technical field of coating equipment, and discloses wet surface upward turn-back type double-layer coating equipment and a coating method, and the wet surface upward turn-back type double-layer coating equipment comprises an unwinding mechanism, a traction mechanism, a deviation rectifying mechanism, a drying oven part, a first combined roller group, a coating mechanism and a winding mechanism. The drying oven part comprises two-channel drying oven mechanisms used for drying different faces of the pole pieces, and the first combined roller set is connected with the different two-channel drying oven mechanisms and used for guiding the pole pieces to enter the different two-channel drying oven mechanisms in the state that the wet faces face upwards. Through the unique structures and optimization of the relative positions of the structures, the pole pieces are folded back and dried in different double-channel drying oven mechanisms, and the wet surfaces face upwards and the dry surfaces rotate during drying each time, so that the coating equipment has the characteristics of compact layout, low energy consumption, stable belt running, no blowing of the air nozzles and good coating effect.

Description

Technical Field

[0001] The invention belongs to the technical field of coating equipment, and in particular relates to a wet-surface-upward folding double-layer coating equipment and a coating method. Background Art

[0002] Pole sheet coating is an important process in the production of lithium batteries. Its purpose is to coat the front and back sides of the pole sheet material with slurry.

[0003] In the reversing double-layer coating machines currently on the market, the pole piece is dried in a reversing manner in the oven. After the pole piece has completed coating and drying on the A side and returns to coat the B side, the wet surface of the B side of the pole piece will face downward. At this time, under the action of gravity and convection wind, the wet slurry surface is very easy to be scraped by the wind nozzle, and the pole piece is prone to wrinkles or cracks due to excessive fluctuations. In order to solve this problem, the reversing coating machine is often equipped with a flipping mechanism after the initial oven mechanism to achieve a 180° reversal of the A and B sides of the pole piece in the vertical direction. However, the flipping mechanism has the problems of large size, complicated structure, and high energy consumption, and it is easy to become an unstable point in the tape running.

[0004] Therefore, how to provide a coating device with a compact structure, stability and good coating effect is an urgent problem to be solved by people in the relevant fields. Summary of the invention

[0005] In order to solve the shortcomings of the prior art, the present invention provides a wet-side-up folding double-layer coating device, which optimizes the path of the pole piece belt through the first combined roller group, so that the pole piece enters the oven mechanism with the wet side facing up, so as to achieve the characteristics of compact coating device structure, stable belt running and good coating effect. In addition, the present invention also provides a coating method based on the wet-side-up folding double-layer coating device.

[0006] The technical effects to be achieved by the present invention are achieved through the following technical aspects:

[0007] In a first aspect, the present invention provides a wet-side-up folding double-layer coating device, comprising:

[0008] Two dual-channel ovens for drying different sides of the pole pieces.

[0009] The dual-channel drying mechanism comprises a first drying channel and a second drying channel, wherein the first drying channel and the second drying channel are both provided with a conveying roller and an air nozzle vertically arranged toward the conveying roller, and the first drying channel and the second drying channel are symmetrically arranged in such a manner that the conveying rollers are close to each other;

[0010] An electrode sheet inlet is provided at the initial end of the first drying channel, and the air nozzle of the first drying channel is vertically downward, so that the electrode sheet enters the first drying channel from the electrode sheet inlet with the wet side facing the air nozzle upward and the dry side abutting against the conveying roller, thereby achieving the initial drying of one side of the electrode sheet;

[0011] A first turning roller is provided between the first drying channel and the second drying channel, so that the electrode piece is in contact with the first turning roller with a dry surface, and turns from the first drying channel to enter the second drying channel, so as to dry one side of the electrode piece again;

[0012] An electrode sheet outlet is provided at the end of the second drying channel, and the electrode sheet inlets of different dual-channel oven mechanisms are located on different sides, and a first combined roller group is provided between the electrode sheet outlet of one dual-channel oven mechanism and the electrode sheet inlet of another dual-channel oven mechanism, so that the other side of the electrode sheet enters the other dual-channel oven mechanism with the wet side facing upward, and the other side of the electrode sheet is dried initially and dried again;

[0013] The coating mechanism comprises a first coating head and a second coating head arranged upstream of the two electrode sheet inlets, so that different surfaces of the electrode sheet are coated to become wet surfaces and then enter the two dual-channel oven mechanisms for drying respectively;

[0014] An unwinding mechanism, used for unwinding unprocessed pole pieces;

[0015] A winding mechanism, used to wind up the electrode after double-sided drying; and

[0016] A traction mechanism and a deviation correction mechanism are arranged between the unwinding mechanism and the rewinding mechanism.

[0017] Preferably, a partition is provided between the first drying channel and the second drying channel for preventing convection between the air nozzles, and the partition is filled with a heat insulating material, and the heat insulating material is at least one of a nano-board, aluminum silicate wool, asbestos board or silicone rubber.

[0018] Preferably, the wind nozzle is a dense wind nozzle; along the direction of air outlet, the wind nozzle is sequentially provided with a first wind uniform plate, a second wind uniform plate and an air outlet, a pressure relief structure is provided between the second wind uniform plate and the air outlet, an air outlet channel connected to the air outlet is formed between the pressure relief structure and the side wall of the wind nozzle, the first wind uniform plate and the second wind uniform plate are respectively provided with a first wind uniform hole and a second wind uniform hole, the second wind uniform hole is connected to the air outlet channel; the aperture range of the second wind uniform hole is 3-6mm, the spacing of the second wind uniform holes in the horizontal arrangement is 5-10mm, and the spacing in the vertical arrangement is 12-20mm.

[0019] Preferably, the combined roller device includes an intermittent first roller and a second roller, the height of the first roller and the second roller is 200mm-1500mm, the height of the first roller is greater than the height of the second roller, the roller wrap angle between the pole piece and each of the first roller or each of the second roller is 5°-85°, and the distance between the first roller and the adjacent second roller is 500mm-2000mm.

[0020] Preferably, the first steering roller is an air-floating roller or a physical roller with a deviation correction function.

[0021] Preferably, the traction mechanism and the deviation correction mechanism are provided upstream of the first coating head and the second coating head.

[0022] Preferably, a traction mechanism is provided downstream of the second drying channel of each of the dual-channel oven mechanisms.

[0023] Preferably, a deviation correcting mechanism is provided between the winding mechanism and the second drying channel of the adjacent double-channel oven mechanism.

[0024] Preferably, it further comprises a first platform and a second platform stacked in the vertical direction, the dual-channel oven mechanism is respectively arranged on the first platform and the second platform, and the first combined roller group is arranged on the first platform.

[0025] In a second aspect, the present invention provides a coating method, using the above-mentioned wet-side-up folding double-layer coating device, comprising the following steps:

[0026] The unwinding mechanism unwinds the unprocessed electrode piece, and after the electrode piece is transported and sequentially passes through one of the traction mechanisms and the deviation correction mechanism, the first coating head coats the A surface of the electrode piece to make the A surface a wet surface;

[0027] With the A side facing upward and toward the air nozzle and the B side abutting against the conveying roller, the electrode piece is conveyed into the first drying channel of one of the double-channel drying mechanisms to achieve the initial drying of the A side;

[0028] In the form of B side abutting against the turning roller, the electrode piece is transferred from the first drying channel to the second drying channel to achieve the re-drying of the A side;

[0029] The first combined roller group transports the electrode piece through the space below the double-channel oven mechanism and transfers the electrode piece to the second coating machine head;

[0030] The second coating head coats the B surface of the electrode to make the B surface wet;

[0031] With the B side facing upward and toward the air nozzle and the A side abutting against the conveying roller, the electrode piece is conveyed into the first drying channel of another double-channel drying mechanism to achieve the initial drying of the B side;

[0032] In the form of A side abutting against the turning roller, the electrode piece is transferred from the first drying channel to the second drying channel to achieve the re-drying of the B side;

[0033] After the pole piece is conveyed through the traction mechanism and the deviation correction mechanism, the winding mechanism winds up the pole piece that has completed double-sided drying.

[0034] In summary, the present invention has at least the following benefits:

[0035] 1. The wet-side-up folding double-layer coating equipment provided by the present invention optimizes the path of the electrode tape so that the electrode always enters the double-channel oven mechanism with the wet side facing up without passing through the flipping mechanism, so as to improve the stability of the electrode tape and obtain a good coating effect. Specifically, the double-channel oven mechanism has two drying channels that are folded back and connected, and a single side of the electrode can be dried twice. The electrode inlets of adjacent double-channel drying mechanisms are located on different sides, and different double-channel drying mechanisms are connected by a first combined roller group to achieve stability in tape walking between drying of different surfaces, and it is beneficial for the electrode to always enter different double-channel drying mechanisms with the wet side facing up, avoiding the situation where the wet side scrapes the wind nozzle, and keeping the electrode on the dry side during tape walking, reducing the shaking, wet slurry casting and coating damage during electrode tape walking.

[0036] Since the pole piece belt path is adjusted, the wet-side-up folding double-layer coating device of the present invention omits the turning mechanism, thereby saving floor space and energy consumption, and having the characteristics of compact layout. At the same time, the setting of the first combined roller group also makes the wet-side-up folding double-layer coating device flexible in layout, does not limit the specific position of the coating mechanism, and is suitable for more production needs and layout designs.

[0037] 2. The wet-side-up foldback coating method provided by the present invention optimizes the electrode tape feeding mode to ensure that the electrode can enter the drying oven mechanism with the wet side facing up, thereby preventing the wet side from scraping the air nozzle and allowing the electrode to keep the dry side during tape feeding, thereby reducing jittering, wet slurry casting and coating damage during tape feeding, and improving the overall coating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of a wet-side-up folding double-layer coating device according to Example 1 of the present invention.

[0039] Figure 2 This is a schematic diagram of the partial structure of the oven part of Example 1 of the present invention.

[0040] Figure 3 This is a schematic diagram of the structure of the air nozzle of Example 1 of the present invention.

[0041] Figure 4 This is a schematic structural diagram of the first combined roller group of Example 1 of the present invention.

[0042] Figure 5 Schematic diagram of the process of the wet-side-up foldback coating method of Example 1 of the present invention.

[0043] Figure 6 It is a schematic structural diagram of a wet-side-up folding double-layer coating device according to Example 2 of the present invention.

[0044] Figure 7 This is a schematic diagram of the partial structure of the oven part of Example 2 of the present invention.

[0045] Figure 8 It is a schematic structural diagram of a wet-side-up folding double-layer coating device according to Example 3 of the present invention.

[0046] Fig. 9 This is a schematic diagram of the partial structure of the oven part of Example 3 of the present invention.

[0047] Markings in the figure:

[0048] 1. Pole piece;

[0049] 2. Coating mechanism; 21. First coating head; 22. Second coating head;

[0050] 3. Oven section; 30. Double-channel oven mechanism; 301. First drying channel; 302. Second drying channel; 303. Partition plate; 304. First turning roller; 305. Conveying roller; 306. Wind nozzle; 3061. First wind uniform plate; 3062. Second wind uniform plate; 3063. Pressure relief structure; 3064. Air outlet channel; 3065. First wind uniform hole; 3066. Second wind uniform hole; 3067. Air outlet; 3068. Wind nozzle body; 307. Pole inlet; 308. Pole outlet; 31. First double-channel oven mechanism; 32. Second double-channel oven mechanism; 33. First inclined plane; 34. Second inclined plane; 35. Third inclined plane;

[0051] 4. First combined roller group; 401. First passing roller; 402. Second passing roller; 41. Guide roller group; 411. Second turning roller;

[0052] 5. Platform, 51. First platform; 52. Second platform;

[0053] 61. Unwinding mechanism; 62. Rewinding mechanism;

[0054] 71. first traction mechanism; 72. second traction mechanism;

[0055] 81. Correction mechanism; 82. Thickness measuring device;

[0056] 9. The second combined roller set. DETAILED DESCRIPTION

[0057] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0058] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0059] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0061] Embodiment 1:

[0062] Please refer to the attached Figures 1 to 5 A wet-side-up folding double-layer coating device adjusts the tape path of the electrode 1 to ensure that the electrode 1 can always enter the oven with the wet side facing up to obtain a good coating and drying effect.

[0063] Specifically, the wet-side-up folding double-layer coating device includes a coating mechanism 2, an oven section 3, and a first combined roller group 4. The coating mechanism 2 is used to coat the surface of the pole piece 1, and includes a first coating head 21 and a second coating head 22 arranged outside the oven section 3. The first coating head 21 and the second coating head 22 are respectively used to coat different surfaces of the pole piece 1 with slurry.

[0064] The oven section 3 includes a dual-channel oven mechanism 30 for drying different surfaces of the electrode piece 1. The first coating head 21 and the second coating head 22 are located upstream of different dual-channel oven mechanisms 30 to coat different surfaces of the electrode piece 1 with slurry, and the surface coated with slurry becomes a wet surface.

[0065] Different dual-channel drying oven mechanisms 30 all include a first drying channel 301 and a second drying channel 302. The first drying channel 301 and the second drying channel 302 are both provided with a conveying roller 305 and an air nozzle 306 vertically arranged toward the conveying roller 305. The first drying channel 301 and the second drying channel 302 are symmetrically arranged with the conveying roller 305 close to each other.

[0066] The first drying channel 301 has an inlet 307 for the electrode piece at the initial end, and the air nozzle 306 of the first drying channel 301 is vertically downward. When the tape is conveyed, the dry surface of the electrode piece 1 abuts against the conveying roller 305 and enters the first drying channel 301 from the inlet 307 for the electrode piece. At this time, the wet surface of the electrode piece 1 faces the air nozzle 306 upward, so that one side of the electrode piece 1 is dried for the first time.

[0067] A first turning roller 304 is provided between the first drying channel 301 and the second drying channel 302. The electrode sheet 1 passing through the first drying channel 301 contacts the first turning roller 304 with its dry side, and turns from the first drying channel 301 to enter the second drying channel 302, where one side of the electrode sheet 1 is dried again.

[0068] In order to further ensure that the pole piece 1 has high quality when traveling and avoid position deviation of the pole piece 1 when turning, the first turning roller 304 is an air-floating roller or a physical roller with a deviation correction function.

[0069] In particular, the electrode sheet inlet 307 of different dual-channel oven mechanisms 30 are located on different sides, and a first combined roller set 4 is provided between the electrode sheet outlet 308 of one dual-channel oven mechanism 30 and the electrode sheet inlet 307 of another dual-channel oven mechanism 30. The first combined roller set 4 is used to transport the electrode sheet 1 through the space below the dual-channel oven mechanism 30 and to transfer the electrode sheet 1 to the second coating machine head 22.

[0070] Specifically, the first combined roller group 4 transfers the pole piece 1 from one of the dual-channel oven mechanisms 30 to the side of the pole piece inlet 307 of the other dual-channel oven mechanism 30 , so that the pole piece 1 then passes through the second coating head 22 .

[0071] In addition, the wet-side-up folding double-layer coating device also includes an unwinding mechanism 61 for unwinding the unprocessed pole piece 1, a rewinding mechanism 62 for rewinding the pole piece 1 after double-sided drying, and a traction mechanism and a correction mechanism 81 arranged between the unwinding mechanism 61 and the rewinding mechanism 62. The unwinding mechanism 61 and the rewinding mechanism 62 can provide the pole piece 1 with an initial driving force for tape walking, and the traction mechanism and the correction mechanism 81 are used to ensure the relative stability of the position of the pole piece 1 during tape walking and improve the tape walking quality.

[0072] During operation, the electrode 1 is unwound by the unwinding mechanism 61, and then sequentially conveyed along the electrode inlet 307 and the electrode outlet 308 of one double-channel oven mechanism 30, the electrode inlet 307 and the electrode outlet 308 of the other double-channel oven mechanism 30, and finally rewound by the rewinding mechanism 62. Among them, the single side of the electrode 1 can achieve the initial drying and secondary drying when passing through the double-channel oven mechanism 30.

[0073] In particular, when entering the dual-channel oven mechanism 30, the electrode 1 always enters the first drying channel 301 with the dry side in contact with the conveying roller 305 and the wet side facing the air nozzle 306 upward, thereby avoiding the wet side from scraping the air nozzle 306 and keeping the electrode 1 on the dry side while walking, reducing the shaking of the electrode 1, the wet slurry casting and the damage to the coating during walking, so as to obtain a good coating effect.

[0074] In addition, the optimization of the pole piece 1 tape path enables the wet-side-up folding double-layer coating equipment to save the turning mechanism, thereby having the characteristics of compact structure and stable tape path, which is conducive to reducing energy consumption in production.

[0075] It should be noted that the above content describes the main working principle and belt transport setting of the wet-side-up turnaround double-layer coating equipment, but the wet-side-up turnaround double-layer coating equipment has layout flexibility, especially the positions of the first coating head 21 and the second coating head 22 are not limited in detail, which can meet different production needs and layout designs.

[0076] The following is a detailed description of the wet side up folding double layer coating equipment in one of the layouts:

[0077] Please refer to Figures 1 to 5 The oven section 3 includes a first double-channel oven mechanism 31 and a second double-channel oven mechanism 32 which are stacked and aligned in the vertical direction. The first double-channel oven mechanism 31 and the second double-channel oven mechanism 32 both include a first drying channel 301 and a second drying channel 302 which is folded back relative to the first drying channel 301. The first drying channel 301 and the second drying channel 302 are both provided with a plurality of air nozzles 306 and a plurality of conveying rollers 305 for conveying the electrode sheet 1.

[0078] The air nozzle 306 of the first drying channel 301 opens downward and is opposite to the conveying roller 305. The A surface of the electrode 1 is coated and becomes a wet surface through the first coating head 21. The electrode 1 enters the first drying channel 301 of the first double-channel oven mechanism 31 from the electrode inlet 307. The B surface of the electrode 1 that is not coated with slurry is in close contact with the conveying roller 305, and the electrode 1 is conveyed under the action of the conveying roller 305; the A surface of the electrode 1 coated with wet slurry faces upward, so that the A surface is opposite to the air nozzle 306, and the air nozzle 306 dries the A surface by blowing air.

[0079] In this process, the wet surface of the pole piece 1 faces upward, and the dry surface is closely attached to the conveying roller 305 under the action of the air nozzle 306, thereby effectively preventing the wet surface of the pole piece 1 from being scraped onto the air nozzle 306 when the pole piece 1 breaks, and also increasing the stability of the pole piece 1 in running, avoiding problems such as wrinkles or cracks on the surface of the pole piece 1 due to large fluctuations. At the same time, the pole piece 1 enters the drying oven 3 with the wet surface facing upward, so that the wet slurry can be dried in time to reduce the occurrence of the undried slurry flowing downward under the action of gravity, which helps to improve the quality of coating and drying of the pole piece 1.

[0080] After the electrode piece 1 has been preliminarily dried on the A side through the first drying channel 301, the B side abuts against the first turning roller 304 and returns to the second drying channel 302. The air nozzle 306 at the second drying channel 302 opens upward and faces the conveying roller 305. The conveying rollers 305 of the first drying channel 301 and the second drying channel 302 are close. At the second drying channel 302, the B side of the electrode piece 1 abuts against the conveying roller 305, and the A side faces the air nozzle 306, so that the A side is dried again.

[0081] The folding connection design of the first drying channel 301 and the second drying channel 302 realizes double drying of a single side of the electrode 1, so that the electrode 1 is fully dried while shortening the length of the drying oven 3, reducing the overall floor space, and having the characteristics of compact structure.

[0082] In particular, since the air nozzles 306 in the first drying channel 301 and the second drying channel 302 are arranged facing each other, in order to reduce the airflow between the facing air nozzles 306, a partition 303 may be further arranged between the first drying channel 301 and the second drying channel 302. The partition 303 separates the first drying channel 301 and the second drying channel 302 to form relatively independent air chambers, and the airflows between different air chambers do not affect each other, thereby avoiding fluctuations when the pole piece 1 is running, thereby facilitating the running stability of the pole piece 1 and facilitating the realization of zoned temperature control.

[0083] Furthermore, the partition 303 is filled with a heat insulating material, which is at least one of nano-board, aluminum silicate wool, asbestos board, and silicone rubber. In particular, the partition 303 may be provided with multiple layers of heat insulating materials, and the heat insulating materials are not unique and are not limited to the listed materials.

[0084] The electrode sheet 1 that has completed the drying of the A side leaves from the electrode sheet outlet 308 of the first dual-channel oven mechanism 31, and then passes through the first combined roller group 4 and moves to the second dual-channel oven mechanism 32. It should be noted that the electrode sheet inlet 307 of the first dual-channel oven mechanism 31 and the second dual-channel oven mechanism 32 are located on different sides.

[0085] The first combined roller group 4 extends in a direction parallel to the first drying channel 301 and the second drying channel 302 and is located in the space below the first dual-channel oven mechanism 31. The electrode 1 abuts against the first combined roller group 4 with its dry surface to achieve smooth belt walking.

[0086] In some embodiments, the air nozzle 306 is preferably a dense air nozzle to improve the drying effect. Furthermore, the dense air nozzle is a double-layer air plate structure. Along the direction of the air outlet, the air nozzle 306 is sequentially provided with a first air uniform plate 3061, a second air uniform plate 3062 and an air outlet 3067, a pressure relief structure 3063 is provided between the second air uniform plate 3062 and the air outlet 3067, and an air outlet channel 3064 connected to the air outlet 3067 is formed between the pressure relief structure 3063 and the inner side wall of the air nozzle 306. In this embodiment, the pressure relief structure 3063 is centrally arranged relative to the second air uniform plate 3062 and the air outlet 3067, so that the air outlet channel 3064 is located on both sides of the inside of the air nozzle 306, so as to quickly dry both sides of the electrode 1 along the width direction.

[0087] The first air balancing plate 3061 and the second air balancing plate 3062 are respectively provided with a first air balancing hole 3065 and a second air balancing hole 3066, and the second air balancing hole 3066 is connected to the air outlet channel 3064; the hot air for drying passes through the first air balancing hole 3065, the second air balancing hole 3066 and the air outlet channel 3064 in sequence and then is discharged from the air outlet 3067 to dry the electrode 1. In this process, the first air balancing hole 3065 performs the initial adjustment of the hot air, and the second air balancing hole 3066 performs the second adjustment of the hot air passing through the first air balancing hole 3065, which helps to reduce the problem of uneven air outlet of the air nozzle 306, so as to ensure uniform drying of the electrode 1.

[0088] In particular, the second uniform air holes 3066 are distributed in a matrix, wherein the aperture range of the second uniform air holes 3066 is 3-6 mm, the spacing of the second uniform air holes 3066 in the horizontal arrangement is 5-10 mm, and the spacing in the vertical arrangement is 12-20 mm. Among them, the horizontal direction refers to the direction parallel to the width of the pole piece 1, and the vertical direction refers to the direction parallel to the extension of the pole piece 1, that is, the running direction of the pole piece 1. In some embodiments, the aperture and arrangement of the first uniform air plate 3061 may be the same as or different from the second uniform air holes 3066. In this embodiment, the ratio of the lateral wind speed at the air outlet 3067 of the wind nozzle 306 to the average wind speed is less than 3%.

[0089] In particular, in this embodiment, the air nozzle 306 includes an air nozzle body 3068, a first air uniform plate 3061, a second air uniform plate 3062 and a pressure relief structure 3063 provided in the air nozzle body 3068, and an air outlet 3067 is provided at the bottom of the air nozzle body 3068. Inside the air nozzle body 3068, the pressure relief structure 3063 is connected to the second air uniform plate 3062 and fixed to the lower half of the air nozzle 306.

[0090] The pressure relief structure 3063 is provided with a first inclined surface 33 and a second inclined surface 34, wherein the first inclined surface 33 is arranged in an outward-facing slanting manner, and the second inclined surface 34 is arranged in an inward-facing slanting manner. The nozzle body 3068 is provided with a third inclined surface 35 adapted to the second inclined surface 34 near the air outlet 3067, and the third inclined surface 35 and the second inclined surface 34 are arranged parallel to each other. The first inclined surface 33, the second inclined surface 34 and the nozzle body 3068 cooperate to make the air outlet channel 3064 between the pressure relief structure 3063 and the nozzle body 3068 present a structure that is wide at the top and narrow at the bottom. After the hot air is evenly mixed by the first air uniforming plate 3061 and the second air uniforming plate 3062, the first inclined surface 33 can be used for buffering and pressure relief to further evenly mix the hot air. That is to say, the hot air is evenly mixed after three stages so that the heat of the hot air is uniform, and then it is blown out at a high speed through the narrow air outlet channel 3064. The heat of the hot air blown out is uniform, which can ensure high-speed and uniform drying of the electrode 1, and the drying effect is good and the efficiency is high.

[0091] Further, such as Figure 4 As shown, the first combined roller group 4 includes an intermittent first roller 401 and a second roller 402, the height of the first roller 401 is greater than the height of the second roller 402, the installation height of the first roller 401 and the second roller 402 relative to the installation base is H, and the value range of the height H is 200mm-1500mm. The roller wrap angle between the pole piece 1 and the first roller 401 or the second roller 402 is θ, and the value range of the roller wrap angle θ is 5°-85°. The spacing between the first roller 401 and the adjacent second roller 402 is 500mm-2000mm.

[0092] In addition, a guide roller group 41 is provided between the end of the first combined roller group 4 and the second double-channel oven mechanism 32. The guide roller group 41 is provided outside the oven section 3 and is used to transfer the pole piece 1 that has completed the drying of the A side to the second double-channel oven mechanism 32. The guide roller group 41 is folded back from the end of the first combined roller group 4 to the second double-channel oven mechanism 32, and flips the pole piece 1, so that the pole piece 1 is changed from the state of the A side facing up to the B side that is not coated with slurry facing up.

[0093] In particular, the pole piece 1 always contacts the first combined roller set 4 and the guide roller set 41 with the B surface which is not coated with slurry, thereby effectively reducing the wear of slurry during the conveying process and improving the coating quality.

[0094] The guide roller set 41 is provided with at least one roller as a second turning roller 411 to achieve the flipping of the pole piece 1. In some embodiments, the guide roller set 41 includes two second turning rollers 411. Figure 1 As shown, the pole piece 1 is placed with its dry side, i.e., side B, against the guide roller set 41, passes through the outer sides of two second turning rollers 411 in sequence, and then turns back toward the direction where the second dual-channel drying oven mechanism 32 is located, thereby completing the turning over of the pole piece 1.

[0095] After passing through the guide roller group 41, the pole piece 1 passes through the second coating head 22 and completes the wet slurry coating on the B surface, and then enters the second double-channel oven mechanism 32 with the wet surface facing upward.

[0096] Similar to the first dual-channel oven mechanism 31, the second dual-channel oven mechanism 32 includes a first drying channel 301 and a second drying channel 302. Among them, the first drying channel 301 and the second drying channel 302 of the second dual-channel oven mechanism 32 are both provided with a nozzle 306 for drying the B surface of the electrode 1 and a plurality of conveying rollers 305 for conveying the electrode 1, and the arrangement of the nozzle 306 and the conveying roller 305 is the same as that of the first dual-channel oven mechanism 31. A partition 303 is provided between the first drying channel 301 and the second drying channel 302, and a relatively independent air chamber is formed under the action of the partition 303, so as to reduce the fluctuation of the electrode 1 caused by the relatively arranged nozzles 306, thereby improving the stability of the electrode 1 and realizing zoned temperature control. A first turning roller 304 is provided between the first drying channel 301 and the second drying channel 302.

[0097] The difference is that the first turning roller 304 in the first dual-channel oven mechanism 31 is located on the right side of the partition 303, and the first turning roller 304 in the second dual-channel oven mechanism 32 is located on the left side of the partition 303. At the same time, the electrode inlet 307 of the first dual-channel oven mechanism 31 and the second dual-channel oven mechanism 32 are located on different sides.

[0098] After the electrode 1 with the A side dried passes through the first combined roller group 4, the guide roller group 41 and the second coating head 22, the B side is coated to become a wet side, and enters the first drying channel 301 of the second double-channel oven mechanism 32 with the wet side facing up for preliminary drying of the B side, and then returns under the action of the first turning roller 304 and enters the second drying channel 302 to complete the final drying of the B side.

[0099] Furthermore, in some embodiments, in order to increase the rationality of the layout of the wet-side-up folding double-layer coating equipment, a platform 5 is also included. In this embodiment, the platform 5 includes a first platform 51, and the first double-channel oven mechanism 31 and the second double-channel oven mechanism 32 are respectively arranged on the upper and lower sides of the first platform 51. The second steering roller 411 of the guide roller group 41 is respectively arranged above and below the first platform 51, so as to guide the pole piece 1 from the first double-channel oven mechanism 31 to the second double-channel oven mechanism 32, and realize the flipping of the pole piece 1. The setting of the first platform 51 shortens the overall length of the wet-side-up folding double-layer coating equipment, and further simplifies the structure.

[0100] In particular, in some embodiments, the platform 5 further includes a second platform 52. The second platform 52 may refer to the ground itself, or may be an additionally constructed platform 5 structure.

[0101] Furthermore, the wet-side-up folding double-layer coating device further includes an unwinding mechanism 61 and a rewinding mechanism 62 disposed outside the oven section 3. The unwinding mechanism 61 is located upstream of the first coating head 21, and the rewinding mechanism 62 is located downstream of the second dual-channel oven mechanism 32. Since the volume of the coil of the pole piece 1 is relatively large, the unwinding mechanism 61 and the rewinding mechanism 62 are preferably placed below the first platform 51.

[0102] Furthermore, in order to maintain the speed of the pole piece 1, accurately control the tension of the pole piece 1 and ensure the stability of the pole piece 1 during the coating process, the wet-side-up folding double-layer coating device can also include a first traction mechanism 71 and a second traction mechanism 72. The first traction mechanism 71 is arranged between the first double-channel oven mechanism 31 and the first combined roller group 4, and the second traction mechanism 72 is arranged between the second double-channel oven mechanism 32 and the winding mechanism 62. Among them, the first traction mechanism 71 and the second traction mechanism 72 are both located outside the oven section 3, and are respectively responsible for providing traction for the pole piece 1 to walk out of the oven section 3, thereby improving the stability of the pole piece 1.

[0103] In some embodiments, the wet-side-up folding double-layer coating device may further include a deflection correction mechanism 81, which is used to detect the position of the pole piece 1 in real time, adjust the deviation of the pole piece 1 during the tape walking process, ensure that the pole piece 1 moves according to the established trajectory, and improve the accuracy and uniformity of the coating. Among them, the deflection correction mechanism 81 can be arranged upstream of the first double-channel oven mechanism 31, and / or between the first double-channel oven mechanism 31 and the second double-channel oven mechanism 32, and / or downstream of the second double-channel oven mechanism 32. In this embodiment, the deflection correction mechanism 81 is arranged between the unwinding mechanism 61 and the first coating head 21, between the first combined roller group 4 and the guide roller group 41, and between the second double-channel oven mechanism 32 and the winding mechanism 62.

[0104] In addition, the wet-side-up folding double-layer coating equipment may also include a thickness measuring device 82, which may be disposed between the coating mechanism 2 and the oven section 3, or between the oven section 3 and the winding mechanism 62. In the present embodiment, the thickness measuring device 82 is disposed between the deviation correction mechanism 81 and the winding mechanism 62. The thickness measuring device 82 is used to detect in real time the thickness of the coating layer formed after the electrode 1 is coated with the slurry. The thickness measuring device 82 transmits the thickness data of the coating layer to the control system, and the control system compares the actual coating layer thickness with the preset thickness. If a thickness deviation is detected, the coating mechanism 2 is promptly controlled through instructions to ensure that the coating layer thickness remains within the preset range, thereby significantly improving the coating uniformity and consistency.

[0105] For details, please refer to Figure 1 to Figure 2 , the unwinding mechanism 61 and the winding mechanism 62 are placed below the first platform 51. The first double-channel oven mechanism 31 is placed above the first platform 51, and the left side of the first double-channel oven mechanism 31 also includes a correction mechanism 81 placed above the first platform 51, a first coating head 21 and a first traction mechanism 71. The right side of the first double-channel oven mechanism 31 includes a correction mechanism 81 arranged above the platform 5. The second double-channel oven mechanism 32 is placed below the platform 5, and the right side is provided with a second coating head 22, a second traction mechanism 72, a correction mechanism 81, a thickness measuring device 82 and a winding mechanism 62.

[0106] The electrode 1 is unwound from the unwinding mechanism 61, and passes through the correction mechanism 81 and the first coating head 21 located above the first platform 51 in sequence. The first coating head 21 coats the slurry on the A surface of the electrode 1 to make the A surface wet. Then the electrode 1 enters the first double-channel drying mechanism 31 with the wet surface facing upward, and moves along the first drying channel 301, the first turning roller 304 and the second drying channel 302 in sequence, completing the double drying of the A surface and forming a coating layer on the A surface.

[0107] Then, the pole piece 1 goes out of the oven 3 , passes through the first traction mechanism 71 , and is sequentially conveyed to the first combined roller set 4 and the guide roller set 41 , and reaches below the first platform 51 , and the pole piece 1 is flipped.

[0108] Next, the electrode 1 passes through the second coating head 22 and the slurry coating on the B surface is completed, making the B surface a wet surface. Since the electrode 1 is turned over, the B surface of the electrode 1 faces upward at this time, and then enters the second double-channel drying mechanism 32 with the wet surface facing upward, and passes through the first drying channel 301, the first turning roller 304 and the second drying channel 302 in sequence, so as to achieve double drying of the B surface and form a coating layer on the B surface.

[0109] Finally, the electrode sheet 1 that has completed the drying of the B surface leaves the oven section 3 , and passes through the second traction mechanism 72 , the deviation correction mechanism 81 and the thickness measuring device 82 in sequence, and is finally recovered by the winding mechanism 62 .

[0110] In the above process, the pole piece 1 is basically in contact with the roller with the dry surface not coated with slurry or the surface of the pole piece 1 that has been dried, thereby reducing the fluctuation of the pole piece 1, avoiding the wet slurry casting or coating from being damaged, and improving the coating quality. At the same time, the overall structure of the wet-side upward return double-layer coating equipment is compact and streamlined, and the pole piece 1 mainly walks along the horizontal belt, thereby reducing the unstable points in the belt path, improving the stability of the belt, and helping to improve the uniformity of the coating slurry and drying effect.

[0111] It should be noted that the above mentioned surface A and surface B of the electrode 1 are not limited to a specific surface of the electrode 1. Here, the surface that is first coated and dried is called the surface A of the electrode 1, and the other surface is called the surface B of the electrode 1.

[0112] Embodiment 2:

[0113] The difference between this embodiment and embodiment 1 is that this embodiment provides a wet-side-up folding double-layer coating device with a layout different from that of the embodiment. Please refer to embodiment 1 for the similarities, and the differences are described in detail below.

[0114] Please refer to Figure 6 to Figure 7 Similar to Example 1, the wet-side-up folding double-layer coating equipment includes a rewinding mechanism 61, a thickness measuring device 82, a correction mechanism 81, a first double-channel oven mechanism 31, a first combined roller group 4, a guide roller group 41, a first traction mechanism 71, a second traction mechanism 72, a second double-channel oven mechanism 32, a rewinding mechanism 62 and a platform 5.

[0115] Different from the first embodiment, the second double-channel oven mechanism 32 is arranged above the first platform 51, and the first double-channel oven mechanism 31 is arranged on the second platform 52 below the first platform 51. Specifically, the unwinding mechanism 61, the deflection correction mechanism 81, the first coating head 21 and the first traction mechanism 71 located below the first platform 51 are arranged on the left side of the first double-channel oven mechanism 31, and the deflection correction mechanism 81 is arranged on the right side. The deflection correction mechanism 81 and the thickness measuring device 82 located above the first platform 51, the rewinding mechanism 62 located below the first platform 51 are arranged on the left side of the second double-channel oven mechanism 32, and the second coating head 22 and the second traction mechanism 72 located above the first platform 51 are arranged on the right side.

[0116] In particular, the wet-side-up folding double-layer coating device in this embodiment further includes a second combined roller group 9. The second combined roller group 9 is located in the space below the second double-channel oven mechanism 32, and extends as a whole in a direction parallel to the first drying channel 301 and the second drying channel 302, so as to achieve smooth conveying of the electrode 1. In this embodiment, the second combined roller group 9 is used to connect the second double-channel oven mechanism 32 and the device downstream of the second double-channel oven mechanism 32. The arrangement of the rollers in the second combined roller group 9 can be the same as that of the first combined roller group 4.

[0117] Specifically, the pole piece 1 is unwound from the unwinding mechanism 61 below the first platform 51, and passes through the correction mechanism 81 and the first coating head 21 in sequence. The first coating head 21 coats the A surface of the pole piece 1 with the wet slurry, and then the pole piece 1 enters the first double-channel drying mechanism 31 with the A surface facing upward, and passes through the first drying channel 301, the first turning roller 304 and the second drying channel 302 in the first double-channel drying mechanism 31 in sequence, and the wet slurry on the A surface is dried to form a coating layer on the A surface.

[0118] Then the pole piece 1 goes out of the oven section 3, passes through the first traction mechanism 71, and is conveyed to the first combined roller group 4 and the guide roller group 41, and reaches the top of the first platform 51. In this process, the pole piece 1 is flipped over, and the pole piece 1 is turned back in the direction of the second dual-channel oven mechanism 32. Then, the pole piece 1 passes through the second coating head 22 and completes the slurry coating on the B side, making the B side a wet side. Since the pole piece 1 is flipped over, the B side of the pole piece 1 is facing up at this time, and then enters the second dual-channel oven mechanism 32 with the wet side facing up, and passes through the first drying channel 301, the first turning roller 304 and the second drying channel 302 in sequence to dry the wet slurry on the B side and form a coating layer on the B side.

[0119] In particular, the electrode piece 1 that has completed the drying of the B side walks out of the oven section 3, passes through the second traction mechanism 72, and is connected to the second combined roller group 9 after being turned back. The second combined roller group 9 is parallel to the second dual-channel oven mechanism 32 as a whole, and is used to guide the electrode piece 1 to finally be unwound from the left side of the oven section 3. The setting of the second combined roller group 9 is conducive to placing the winding mechanism 62 and the unwinding mechanism 61 on the same side, further reducing the overall length of the wet-side upward folding double-layer coating equipment, facilitating the unified scheduling and management of the loading and unloading operations, and making the layout more compact and streamlined.

[0120] The pole piece 1 that has passed through the second double-channel oven mechanism 32 is conveyed along the second combined roller group 9 , and then passes through the deviation correction mechanism 81 and the thickness measuring device 82 in sequence, and is finally recovered by the winding mechanism 62 .

[0121] It should be noted that this embodiment does not specifically limit the position of each mechanism and the number of turns of the drying channel. The position of each mechanism and the number of turns of the drying channel can be appropriately adjusted based on the main tape path of the electrode 1 mentioned above.

[0122] Embodiment 3:

[0123] The difference between this embodiment and embodiment 1 is that this embodiment provides a wet-side-up folding double-layer coating device with a layout different from that of embodiment 1. Please refer to embodiments 1 and 2 for the similarities, and the differences are described in detail below.

[0124] Please refer to Figures 8 to 9 Similar to Example 1, the wet-side-up folding double-layer coating equipment includes a rewinding mechanism 61, a thickness measuring device 82, a correction mechanism 81, a first double-channel oven mechanism 31, a first combined roller group 4, a guide roller group 41, a first traction mechanism 71, a second traction mechanism 72, a second double-channel oven mechanism 32, a rewinding mechanism 62 and a platform 5.

[0125] The layout of this embodiment is similar to that of Embodiment 1, except that the reeling mechanism 62 and the unreeling mechanism 61 are located on the same side of the oven portion 3 .

[0126] Specifically, the first double-channel oven mechanism 31 is arranged above the first platform 51, and the second double-channel oven mechanism 32 is arranged on the second platform 52 below the first platform 51. The first double-channel oven mechanism 31 is provided with a deflection correction mechanism 81 above the first platform 51, a first coating machine head 21 and a first traction mechanism 71, and an unwinding mechanism 61 below the first platform 51 on the left side; and a deflection correction mechanism 81 above the first platform 51 is provided on the right side.

[0127] The second double-channel oven mechanism 32 is provided with a winding mechanism 62 , a thickness measuring device 82 and a deviation correcting mechanism 81 below the first platform 51 on the left side, and with a second coating machine head 22 and a second traction mechanism 72 below the first platform 51 on the right side.

[0128] In particular, the wet-side-up folding double-layer coating device in this embodiment further includes a second combined roller set 9. The second combined roller set 9 is disposed in the space below the second double-channel oven mechanism 32, and extends as a whole in a direction parallel to the first drying channel 301 and the second drying channel 302, so as to achieve smooth conveying of the electrode sheet 1. In this embodiment, the second combined roller set 9 is used to connect the second double-channel oven mechanism 32 and the device downstream of the second double-channel oven mechanism 32.

[0129] Specifically, the pole piece 1 is unwound from the unwinding mechanism 61 below the first platform 51, and passes through the correction mechanism 81 and the first coating head 21 above the first platform 51 in sequence. The first coating head 21 coats the A surface of the pole piece 1 with the wet slurry, and then the pole piece 1 enters the first double-channel drying mechanism 31 with the A surface facing upward, and passes through the first drying channel 301, the first turning roller 304 and the second drying channel 302 in the first double-channel drying mechanism 31 in sequence, and the wet slurry on the A surface is dried to form a coating layer on the A surface.

[0130] Then the pole piece 1 goes out of the oven section 3, passes through the first traction mechanism 71, and then moves to the first combination roller group 4 and the guide roller group 41, reaches the bottom of the first platform 51, and turns back in the direction of the second double-channel oven mechanism 32, and turns over in the process. After turning back, the whole enters the second double-channel oven mechanism 32 with the B side facing up. Before entering the second double-channel oven mechanism 32, the B side passes through the second coating head 22 and completes the slurry coating, making the B side a wet side. The pole piece 1 entering the second double-channel oven mechanism 32 passes through the first drying channel 301, the first turning roller 304 and the second drying channel 302 in sequence to dry the wet slurry on the B side and form a coating layer on the B side.

[0131] In particular, the electrode piece 1 that has completed the drying of the B side walks out of the oven section 3, passes through the second traction mechanism 72, and is connected to the second combined roller group 9 after being turned back. The second combined roller group 9 is parallel to the second dual-channel oven mechanism 32 as a whole, and is used to guide the electrode piece 1 to finally be unwound from the left side of the oven section 3. The setting of the second combined roller group 9 is conducive to placing the winding mechanism 62 and the unwinding mechanism 61 on the same side, further reducing the overall length of the wet-side upward folding double-layer coating equipment, facilitating the unified scheduling and management of the loading and unloading operations, and making the layout more compact and streamlined.

[0132] The pole piece 1 that has passed through the second double-channel oven mechanism 32 is conveyed along the second combined roller group 9 , and then passes through the deviation correction mechanism 81 and the thickness measuring device 82 in sequence, and is finally recovered by the winding mechanism 62 .

[0133] The above contents are merely examples and illustrations of the structure of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these obvious replacement forms all belong to the protection scope of the present invention.

Claims

1. A wet-side-up folding double-layer coating device, characterized in that: It includes two dual-channel oven mechanisms for drying different sides of the electrode. The dual-channel drying mechanism comprises a first drying channel and a second drying channel, wherein the first drying channel and the second drying channel are both provided with a conveying roller and an air nozzle vertically arranged toward the conveying roller, and the first drying channel and the second drying channel are symmetrically arranged in such a manner that the conveying rollers are close to each other; An electrode sheet inlet is provided at the initial end of the first drying channel, and the air nozzle of the first drying channel is vertically downward, so that the electrode sheet enters the first drying channel from the electrode sheet inlet with the wet side facing the air nozzle upward and the dry side abutting against the conveying roller, thereby achieving the initial drying of one side of the electrode sheet; A first turning roller is provided between the first drying channel and the second drying channel, so that the electrode piece is in contact with the first turning roller with a dry surface, and turns from the first drying channel to enter the second drying channel, so as to dry one side of the electrode piece again; An electrode sheet outlet is provided at the end of the second drying channel, and the electrode sheet inlets of different dual-channel oven mechanisms are located on different sides, and a first combined roller group is provided between the electrode sheet outlet of one dual-channel oven mechanism and the electrode sheet inlet of another dual-channel oven mechanism, so that the other side of the electrode sheet enters the other dual-channel oven mechanism with the wet side facing upward, and the other side of the electrode sheet is dried initially and dried again; The coating mechanism comprises a first coating head and a second coating head arranged upstream of the two electrode sheet inlets, so that different surfaces of the electrode sheet are coated to become wet surfaces and then enter the two dual-channel oven mechanisms for drying respectively; An unwinding mechanism, used for unwinding unprocessed pole pieces; The winding mechanism is used to wind up the pole piece after double-sided drying; as well as A traction mechanism and a deviation correction mechanism are arranged between the unwinding mechanism and the rewinding mechanism.

2. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: A partition is provided between the first drying channel and the second drying channel for preventing convection between the air nozzles, and the partition is filled with a heat insulating material, which is at least one of a nano plate, aluminum silicate wool, asbestos board or silicone rubber.

3. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: The air nozzle is a dense air nozzle; Along the direction of air outlet, the wind nozzle is sequentially provided with a first wind uniform plate, a second wind uniform plate and an air outlet, a pressure relief structure is provided between the second wind uniform plate and the air outlet, an air outlet channel connected to the air outlet is formed between the pressure relief structure and the side wall of the wind nozzle, the first wind uniform plate and the second wind uniform plate are respectively provided with a first wind uniform hole and a second wind uniform hole, the second wind uniform hole is connected to the air outlet channel; the aperture range of the second wind uniform hole is 3-6mm, the spacing of the second wind uniform holes in the horizontal arrangement is 5-10mm, and the spacing in the vertical arrangement is 12-20mm.

4. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: The combined roller device includes a first roller and a second roller that are intermittently constructed, the heights of the first roller and the second roller are 200mm-1500mm, the height of the first roller is greater than the height of the second roller, the roller wrap angle between the pole piece and each of the first roller or each of the second roller is 5°-85°, and the distance between the first roller and the adjacent second roller is 500mm-2000mm.

5. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: The first steering roller is an air-floating roller or a solid roller with a deviation correction function.

6. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: The traction mechanism and the deviation correction mechanism are both provided upstream of the first coating head and the second coating head.

7. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: A traction mechanism is provided downstream of the second drying channel of each of the dual-channel drying mechanisms.

8. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: A deviation correcting mechanism is provided between the winding mechanism and the second drying channel of the adjacent double-channel oven mechanism.

9. The wet-side-up folding double-layer coating device according to claim 1, characterized in that: It also includes a first platform and a second platform stacked in the vertical direction, the double-channel oven mechanism is respectively arranged on the first platform and the second platform, and the first combined roller group is arranged on the first platform.

10. A coating method, using the wet-side-up folding double-layer coating device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The unwinding mechanism unwinds the unprocessed electrode piece, and after the electrode piece is transported and sequentially passes through one of the traction mechanisms and the deviation correction mechanism, the first coating head coats the A surface of the electrode piece to make the A surface a wet surface; With the A side facing upward and toward the air nozzle and the B side abutting against the conveying roller, the electrode piece is conveyed into the first drying channel of one of the double-channel drying mechanisms to achieve the initial drying of the A side; In the form of B side abutting against the turning roller, the electrode piece is transferred from the first drying channel to the second drying channel to achieve the re-drying of the A side; The first combined roller group transports the electrode piece through the space below the double-channel oven mechanism and transfers the electrode piece to the second coating machine head; The second coating head coats the B surface of the electrode to make the B surface wet; With the B side facing upward and toward the air nozzle and the A side abutting against the conveying roller, the electrode piece is conveyed into the first drying channel of another double-channel drying mechanism to achieve the initial drying of the B side; In the form of A side abutting against the turning roller, the electrode piece is transferred from the first drying channel to the second drying channel to achieve the re-drying of the B side; After the pole piece is conveyed through the traction mechanism and the deviation correction mechanism, the winding mechanism winds up the pole piece that has completed double-sided drying.

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