Double-layer turn-back type coating device and coating system

Abstract

The invention provides a double-layer turn-back type coating device and a coating system.The double-layer turn-back type coating device comprises a double-channel drying oven mechanism, an integrated double-face coating mechanism, a winding and unwinding mechanism and a rotating mechanism, the double-channel drying oven mechanism comprises two drying ovens which are arranged in an up-down stacked mode, and each drying oven comprises an upper drying channel and a lower drying channel; the empty foil enters the upper-layer drying oven and the lower-layer drying oven to be baked after the first surface coating is completed, then enters the lower-layer drying oven and the upper-layer drying oven to be baked after the second surface coating is completed, and the pole piece is prepared. According to the double-layer turn-back type coating device and the coating system, the overall length and the occupied area of the device are greatly shortened, the overall layout of a coating production line is optimized, the pole piece baking efficiency is effectively improved, the coating device is flexible in layout point location, and the coating device can be placed on a first-layer or second-layer platform according to the plant layout; the problem that the pole piece is easy to run on an empty belt is solved, and the baking efficiency and quality of the pole piece are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery pole piece production, and in particular relates to a double-layer foldback coating device and a coating system. Background Art

[0002] Pole sheet coating is an extremely important part of the lithium battery production process. Different electrode slurries need to be coated on both sides of the current collector and dried to form pole sheets. Pole sheet coating mainly includes two steps: coating and baking. In order to ensure the complete drying of the electrode slurry, the existing return coater generally designs a relatively long oven, which not only leads to a large overall footprint of the device, a long production line layout, and work efficiency is limited by the transportation distance, but also easily leads to the situation that the pole sheet goes empty, affecting the baking efficiency and baking quality of the pole sheet. Summary of the invention

[0003] In order to address the deficiencies of the prior art, the present invention provides a double-layer folding coating device, which utilizes a dual-channel oven mechanism, an integrated double-sided coating mechanism, and a winding and unwinding mechanism in combination with a rotating mechanism to perform two coatings and four bakings on the two sides of the electrode respectively. This not only greatly shortens the overall length and footprint of the device, optimizes the overall layout of the coating production line, and effectively improves the efficiency of electrode baking, but also the double-layer folding design formed by the dual-channel oven mechanism, the winding and unwinding mechanism and the rotating mechanism solves the problem that the electrode is prone to empty belts, further significantly improving the working efficiency and work quality of the electrode.

[0004] The present invention also provides a coating system using the double-layer return coating device, which can not only effectively optimize the overall layout of the system and reduce the overall footprint of the system, but also effectively improve the efficiency and quality of electrode coating.

[0005] The technical effects to be achieved by the present invention are achieved through the following technical aspects: In a first aspect, the present invention provides a double-layer folding coating device, comprising: The double-channel oven mechanism includes two ovens stacked up and down, each oven includes two upper and lower drying channels to perform return baking on the electrode; An integrated double-sided coating mechanism, including an A-side coating component for coating the slurry on the first side of the electrode sheet, and a B-side coating component for coating the slurry on the second side of the electrode sheet; The unwinding and rewinding mechanism unwinds the bare foil and rewinds the dried electrode; and a rotating mechanism, arranged between the ends of the two ovens, comprising an outer rotating assembly for realizing the rotation of the pole piece between the upper drying channel of the upper oven and the lower drying channel of the lower oven, and an inner rotating assembly for realizing the rotation of the pole piece between the lower drying channel of the upper oven and the upper drying channel of the lower oven; Furthermore, the double-layer fold-back coating device enables the electrode to be coated twice and dried four times.

[0006] As a preferred solution, the feeding end and the discharging end of the double-channel oven mechanism are located on the same side of the mechanism.

[0007] As a preferred solution, the double-channel oven mechanism comprises an upper oven and a lower oven stacked up and down; wherein, The upper oven comprises a first drying channel on the upper layer and a second drying channel on the lower layer; The lower oven comprises a third drying channel on the upper layer and a fourth drying channel on the lower layer; The two drying channels in the upper oven and the lower oven are separated by a partition to form an independent temperature control area.

[0008] As a preferred solution, the upper oven and the lower oven both include an oven body, an air nozzle disposed in the oven body for baking the electrode sheet, and a baking conveying roller disposed in the oven body corresponding to the air nozzle; The position correspondence between the air nozzles and the baking conveyor rollers in the upper oven and the lower oven is opposite, and the position correspondence between the air nozzles and the conveyor rollers in the upper and lower drying channels of the upper oven and the lower oven is the same.

[0009] As a preferred solution, the first drying channel and the fourth drying channel perform secondary baking on the A side of the electrode; the second drying channel and the third drying channel perform secondary baking on the B side of the electrode.

[0010] As a preferred solution, the outer rotating component and the inner rotating component have no less than 3 rollers, and both the outer rotating component and the inner rotating component have a deviation correction function.

[0011] As a preferred scheme, the unwinding and winding mechanism includes a pole piece unwinding assembly and a first folding traction assembly arranged corresponding to the feeding end of the dual-channel oven mechanism, and a pole piece winding assembly and a second folding traction assembly arranged corresponding to the discharging end of the dual-channel oven mechanism; and the first folding traction assembly and the second folding traction assembly are arranged between the pole piece unwinding assembly and the pole piece winding assembly.

[0012] As a preferred embodiment, the double-layer folding coating device also includes a material roll correction mechanism, which includes an unwinding correction component arranged corresponding to the feeding end of the double-channel oven mechanism, and a winding correction component arranged corresponding to the discharging end of the double-channel oven mechanism.

[0013] As a preferred solution, the web-roll correction mechanism further includes a first traction correction component arranged corresponding to the feeding end of the dual-channel oven mechanism, and a second traction correction component arranged corresponding to the discharging end of the dual-channel oven mechanism.

[0014] In a second aspect, the present invention provides a coating system, comprising: The double-layer return coating device is used to coat and return bake the two sides of the electrode respectively; And a thickness measuring device is arranged corresponding to the double-layer return coating device, and is used to detect the coating thickness on both sides of the electrode piece.

[0015] In summary, the present invention has at least the following benefits: 1. The double-layer folding coating device provided by the present invention utilizes a dual-channel oven mechanism, an integrated double-sided coating mechanism, and a winding and unwinding mechanism in combination with a rotary mechanism to perform two coatings and four bakings on the two sides of the electrode respectively, which not only greatly shortens the overall length and floor space of the device, optimizes the overall layout of the coating production line, and effectively improves the efficiency of electrode baking, but also the double-layer folding design formed by the dual-channel oven mechanism, the winding and unwinding mechanism and the rotary mechanism solves the problem that the electrode is prone to empty belts, and further significantly improves the working efficiency and work quality of the electrode.

[0016] 2. The coating system provided by the present invention can not only effectively optimize the overall layout of the system and reduce the overall footprint of the system, but also effectively improve the efficiency and quality of electrode coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the first layout structure of the coating system in an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the second layout structure of the coating system in an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the third layout structure of the coating system in an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the structure of the double-channel oven mechanism in an embodiment of the present invention.

[0021] Reference numerals: 10. Double-layer folding coating device; 100, double-channel oven mechanism; 110, upper oven; 111, first drying channel; 112, second drying channel; 120, lower oven; 121, third drying channel; 122, fourth drying channel; 101, oven body; 102, air nozzle; 103, baking conveyor roller; 210, A-side coating component; 220, B-side coating component; 310, pole piece unwinding assembly; 320, first folding and pulling assembly; 330, pole piece winding assembly; 340, second folding and pulling assembly; 410, unwinding correction component; 420, winding correction component; 430, first traction correction component; 440, second traction correction component; 510, outer rotating assembly; 520, inner rotating assembly; 20. Thickness measuring device. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1: Please refer to the attached Figure 1 and 3 The double-layer folding coating device 10 of this embodiment includes a double-channel oven mechanism 100, an integrated double-sided coating mechanism, a reeling and unwinding mechanism, and a rotating mechanism; wherein the double-channel oven mechanism 100 is used to perform two folding baking on both sides of the electrode sheet respectively, the integrated double-sided coating mechanism is used to coat both sides of the electrode sheet respectively, and the reeling and unwinding mechanism and the rotating mechanism are combined for the folding conveyance of the electrode sheet in the double-channel oven mechanism 100, so as to realize two bakings on both sides of the electrode sheet, so as to ensure the efficiency and quality of the electrode sheet baking. Furthermore, the feed end and the discharge end of the double-channel oven mechanism 100 are located on the same side or opposite sides of the mechanism; preferably, the feed end and the discharge end of the double-channel oven mechanism 100 are located on the same side of the mechanism, which is convenient for the distribution and transportation of raw materials such as coating slurry and finished products, and convenient for centralized feeding and clean workshop setting, and improves the transportation efficiency of raw materials and finished products, so as to effectively improve the working efficiency of electrode sheet coating.

[0025] Please refer to the attached Figure 1 , 3and 4, the dual-channel oven mechanism 100 includes an upper oven 110 and a lower oven 120 stacked up and down, and the upper oven 110 and the lower oven 120 each include two upper and lower drying channels. Specifically, the upper oven 110 includes a first drying channel 111 on the upper layer, and a second drying channel 112 on the lower layer; the lower oven 120 includes a third drying channel 121 on the upper layer, and a fourth drying channel 122 on the lower layer; and the two drying channels in the upper oven 110 and the lower oven 120 are separated by a partition to form an independent temperature control area, so as to avoid the air nozzle 102 between the two drying channels from disturbing the electrode, so as to make the electrode baking process more stable. Preferably, the first drying channel 111 and the fourth drying channel 122 perform secondary baking on the A side of the electrode; the second drying channel 112 and the third drying channel 121 perform secondary baking on the B side of the electrode. The layered dual-channel oven mechanism 100 allows the electrode to be dried twice in each oven and the electrode to be baked four times, which greatly shortens the overall length and floor space of the device, optimizes the overall layout of the coating production line, avoids the waste of resources caused by the electrode leaving the oven and walking on an empty belt, and greatly improves the efficiency of electrode baking.

[0026] Please refer to the attached Figure 4 , further, the upper oven 110 and the lower oven 120 both include an oven body 101, a nozzle 102 disposed in the oven body 101 for baking the electrode, and a baking conveying roller 103 disposed in the oven body 101 corresponding to the nozzle 102; preferably, the position correspondence between the nozzle 102 and the baking conveying roller 103 in the upper oven 110 and the lower oven 120 is opposite, and the position correspondence between the nozzle 102 and the conveying roller in the upper and lower drying channels of the upper oven 110 and the lower oven 120 is the same. That is, the position correspondence between the nozzle 102 and the conveying roller in the first drying channel 111 and the second drying channel 112 is the same, and the position correspondence between the nozzle 102 and the conveying roller in the third drying channel 121 and the fourth drying channel 122 is the same.

[0027] Furthermore, the air nozzles 102 in the upper oven 110 and the lower oven 120 are arranged in two rows in parallel in the oven body 101, and the baking conveyor rollers 103 are arranged correspondingly thereto, and the air outlets of the air nozzles 102 in the upper oven 110 face downward, and the air outlets of the air nozzles 102 in the lower oven 120 face upward, as shown in the attached Figure 4As shown. When the electrode is baked and rotated out of the oven for the first time after baking, the newly coated slurry surface (wet surface) of the electrode can be always placed facing the air nozzle 102. Under the pressure of the airflow, the electrode is close to the baking conveyor roller 103. The baking conveyor roller 103 can reduce the fluctuation of the electrode and avoid wrinkling and cracking of the electrode surface due to large fluctuations. Preferably, the baking conveyor roller 103 is an air-floating steering roller or an electromagnetic steering roller to achieve non-contact steering, which can effectively avoid slurry wear and ensure the quality of electrode production.

[0028] The integrated double-sided coating mechanism includes an A-side coating assembly 210 for coating the first side of the electrode with slurry, and a B-side coating assembly 220 for coating the second side of the electrode with slurry; the A-side coating assembly 210 and the B-side coating assembly 220 use coating structures that can achieve electrode coating in the prior art, which is not the main invention of this technical solution, so it will not be repeated here. Please refer to the attached Figure 1 , 3 and 4, the A-side coating component 210 is arranged corresponding to the feed end of the first drying channel 111 in the upper oven 110, and can be placed on the upper platform corresponding to the upper oven 110 or the lower platform corresponding to the lower oven 120 according to actual needs; the B-side coating component 220 is arranged corresponding to the feed end of the third drying channel 121 in the lower oven 120, and is preferably placed on the lower platform corresponding to the lower oven 120.

[0029] The unwinding and rewinding mechanism is used for unwinding the bare foil and rewinding the dried electrode, and includes an electrode unwinding assembly 310 and a first folding and pulling assembly 320 corresponding to the feeding end of the dual-channel oven mechanism 100, and an electrode rewinding assembly 330 and a second folding and pulling assembly 340 corresponding to the discharging end of the dual-channel oven mechanism 100; and the first folding and pulling assembly 320 and the second folding and pulling assembly 340 are arranged between the electrode unwinding assembly 310 and the electrode rewinding assembly 330. The electrode unwinding assembly 310 is used for unwinding the electrode, the electrode rewinding assembly 330 is used for rewinding the electrode, and the first folding and pulling assembly 320 and the second folding and pulling assembly 340 are used for pulling and conveying the electrode, so as to realize the folding and conveying of the electrode between the electrode unwinding assembly 310 and the electrode rewinding assembly 330, so as to effectively realize the two-sided and four-time folding and baking of the electrode. The loading and unloading method adopts the AGV automatic docking method, which is compatible with manual loading and unloading, and cooperates with the automatic tape splicing device to realize non-stop material change; when the pole piece unwinding component 310 unwinds and loads, the coating roll is automatically aligned by the AGV docking auxiliary V-shaped bracket, and the automatic gluing device sticks the splicing tape at the specified position, and then the double-acting mechanical air expansion chuck with conical surface positioning clamps the material roll. When the roll change starts, the turret rotates, and the tension control system will adjust the swing roller position according to the tension of the material tape to achieve constant tension. When it reaches the preset position, the cutter cuts the material tape, and at the same time, the coating roll is bonded to the material tape to complete the roll change.

[0030] Preferably, the electrode unwinding assembly 310 and the electrode winding assembly 330 are placed on the same side of the dual-channel oven mechanism 100, which is convenient for automatic loading and unloading, shortens the loading and unloading distance, and is conducive to the unified scheduling management of AGV. The electrode unwinding assembly 310 and the electrode winding assembly 330 can also be placed on both sides of the dual-channel oven mechanism 100 according to the layout of the factory. Please refer to the attached Figure 1 , 3 and 4, the electrode unwinding assembly 310 is arranged corresponding to the first drying channel 111 in the upper oven 110, and the first return traction assembly 320 is arranged corresponding to the second drying channel 112 in the upper oven 110; the electrode winding assembly 330 is arranged corresponding to the third drying channel 121 in the lower oven 120, and the second return traction assembly 340 is arranged corresponding to the fourth drying channel 122 in the lower oven 120.

[0031] Please refer to the attached Figure 1 , 3 and 4, the rotating mechanism is arranged between the ends of the upper oven 110 and the lower oven 120, including an outer rotating assembly 510 for realizing the rotation of the electrode sheet between the first drying channel 111 of the upper oven 110 and the fourth drying channel 122 of the lower oven 120, and an inner rotating assembly 520 for realizing the rotation of the electrode sheet between the second drying channel 112 of the upper oven 110 and the third drying channel 121 of the lower oven 120; preferably, the outer rotating assembly 510 and the inner rotating assembly 520 have no less than 3 rollers, and both the outer rotating assembly 510 and the inner rotating assembly 520 have a correction function.

[0032] The double-layer folding coating device 10 also includes a material roll correction mechanism, which includes an unwinding correction component 410 and a first traction correction component 430 arranged corresponding to the feeding end of the dual-channel oven mechanism 100, and a rewinding correction component 420 and a second traction correction component 440 arranged corresponding to the discharging end of the dual-channel oven mechanism 100. The unwinding correction component 410 and the first traction correction component 430 are combined to correct the pole piece during the unwinding conveying process; the rewinding correction component 420 and the second traction correction component 440 are combined to correct the pole piece during the rewinding conveying process. Each correction component detects the position of the pole piece in real time based on a sensor, adjusts and detects the deviation of the pole piece during the belt conveying process, ensures that the pole piece is transmitted according to the established trajectory, improves the accuracy and uniformity of coating, and prevents the coating quality from being affected by the deviation of the pole piece. Please refer to the attached Figure 1 , 3 and 4, the unwinding correction component 410 and the first traction correction component 430 are arranged corresponding to the first drying channel 111 in the upper oven 110, and the winding correction component 420 and the second traction correction component 440 are arranged corresponding to the fourth drying channel 122 in the lower oven 120.

[0033] The double-layer return coating device 10 in this embodiment provides a new layout of return coating and drying. The pole piece is unwound by the pole piece unwinding component 310, and after passing through the unwinding correction component 410 and the first traction correction component 430, the A-side coating component 210 coats the A-side of the pole piece; after coating, the pole piece enters the first drying channel 111 in the upper oven 110, and the A-side is dried for the first time, and then returns through the outer rotating component 510 and enters the fourth drying channel 120 in the lower oven 120. 2, the A surface is dried again; after the second drying, it comes out of the lower oven 120, is turned 180° by the second return traction component 340 and is transported to the B surface coating component 220, and the B surface is coated by the B surface coating component 220, and then enters the third drying channel 121 of the lower oven 120 to dry the B surface for the first time, and then returns through the inner rotating component 520, enters the second drying channel 112 of the upper oven 110 to dry the B surface again, and finally the electrode is wound up after traction and correction.

[0034] Embodiment 2: The double-layer folding coating device 10 of this embodiment is the same as that of the first embodiment, and both include a double-channel oven mechanism 100, an integrated double-sided coating mechanism, a reeling and unreeling mechanism, and a rotating mechanism; the main difference is that: Please refer to the attached Figure 2 and 4 In this embodiment, the pole piece unwinding assembly 310, the unwinding correction assembly 410, the first traction correction assembly 430 and the A-side coating assembly 210 are arranged corresponding to the third drying channel 121 in the lower oven 120, the first return traction assembly 320 and the second traction correction assembly 440 are arranged corresponding to the second drying channel 112 in the upper oven 110, the B-side coating assembly 220 is arranged corresponding to the first drying channel 111 in the upper oven 110, and the second return traction assembly 340, the winding correction assembly 420 and the pole piece winding assembly 330 are arranged corresponding to the fourth drying channel 122 in the lower oven 120.

[0035] In the double-layer folding coating device 10 of this embodiment, the electrode unwinding assembly 310 unwinds the electrode, and after passing through the unwinding correction assembly 410 and the first traction correction assembly 430, the A-side coating assembly 210 coats the A-side of the electrode; after coating, the electrode enters the third drying channel 121 in the lower oven 120 to dry the A-side for the first time, and then returns through the inner rotating assembly 520 to enter the second drying channel 112 in the upper oven 110 to dry the A-side again. Dry; after secondary drying, it exits the upper oven 110, is turned 180° by the first return traction component 320 and then transported to the B-side coating component 220, and the B-side coating component 220 coats the B-side, and then enters the first drying channel 111 of the upper oven 110 to dry the B-side for the first time, and then returns through the outer rotating component 510, enters the fourth drying channel 122 of the lower oven 120 to dry the B-side again, and finally, after traction and deviation correction, the electrode is rolled up.

[0036] Embodiment 3: Please refer to the attached Figure 1-4 The coating system of this embodiment includes the double-layer reciprocating coating device 10 described in Embodiments 1-2, which is used to coat the two sides of the electrode twice and bake four times; and a thickness measuring device 20 corresponding to the double-layer reciprocating coating device 10, which is used to detect the coating thickness on both sides of the electrode. Preferably, the thickness measuring device 20 is arranged corresponding to the discharge end of the electrode; further, the thickness measuring device 20 includes a non-contact sensor arranged corresponding to the tape-carrying electrode, and a thickness monitoring module connected to the non-contact sensor.

[0037] Attach Figure 1 Taking the layout in as an example, the working process of the coating system in this embodiment is as follows: When the electrode piece enters the first drying channel 111 in the upper oven 110 for the first baking, at this time, the electrode piece A side faces the wind nozzle 102 and the back is against the baking conveyor roller 103. Due to the air flow pressure on the upper part of the electrode piece, the electrode piece is close to the baking conveyor roller 103, which can reduce the fluctuation of the electrode piece and avoid wrinkling and cracking of the electrode piece surface caused by large fluctuations; after the first baking is completed, the electrode piece is turned by the outer rotating component 510 and conveyed to the fourth drying channel 122 of the lower oven 120 for secondary baking. The baking principle is the same as the first time. At this time, the A side faces the wind nozzle 102 set below. At this point, the electrode piece A side has completed two bakings. Next, after the pole piece is reversed 180° by the second return traction assembly 340, it is transported to the B-side coating assembly 220 for B-side coating. Subsequently, the pole piece is first baked on the B-side for the first time in the third drying channel 121 of the lower oven 120, and then baked on the B-side for the second time in the second drying channel 112 of the upper oven 110, completing the double baking of the A and B sides of the pole piece.

[0038] During the coating and baking process, the non-contact sensor monitors the thickness of the coating layer in real time and transmits the thickness data to the thickness monitoring module. The thickness monitoring module compares it with the preset thickness standard. If a thickness deviation is detected, an adjustment instruction is issued to control the double-sided coating mechanism for real-time adjustment to ensure that the coating layer thickness always remains within the preset range, significantly improving the coating uniformity and consistency.

[0039] It can be seen from the technical solutions of the above embodiments that the present invention provides a double-layer folding coating device, which not only greatly shortens the overall length and floor space of the device, but also has flexible layout points, which can be freely placed according to the layout of the plant, optimizes the overall layout of the coating production line, and effectively improves the efficiency of electrode baking. In addition, the double-layer folding design formed by the combination of the double-channel oven mechanism, the rewinding and unwinding mechanism and the rotary mechanism solves the problem that the electrode is prone to empty belts, and further significantly improves the working efficiency and work quality of the electrode. The present invention also provides a coating system, which can not only effectively optimize the overall layout of the system and reduce the overall floor space of the system, but also effectively improve the efficiency and quality of electrode coating.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] 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.

[0042] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] Although the present invention is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A double-layer folding coating device (10), characterized in that: include: A double-channel oven mechanism (100) comprises two ovens stacked up and down, each oven comprising two upper and lower drying channels for performing return baking on the electrode sheets; An integrated double-sided coating mechanism, comprising an A-side coating component (210) for coating the slurry on the first side of the electrode sheet, and a B-side coating component (220) for coating the slurry on the second side of the electrode sheet; The unwinding and rewinding mechanism unwinds the bare foil and rewinds the dried electrode; and a rotating mechanism, arranged between the ends of the two ovens, comprising an outer rotating assembly (510) for enabling the electrode sheet to rotate between the upper drying channel of the upper oven (110) and the lower drying channel of the lower oven (120), and an inner rotating assembly (520) for enabling the electrode sheet to rotate between the lower drying channel of the upper oven (110) and the upper drying channel of the lower oven (120); Furthermore, the double-layer fold-back coating device (10) enables the electrode to be coated twice and dried four times.

2. The double-layer folding coating device (10) according to claim 1, characterized in that: The feeding end and the discharging end of the double-channel oven mechanism (100) are located on the same side of the mechanism.

3. The double-layer folding coating device (10) according to claim 1, characterized in that: The dual-channel oven mechanism (100) comprises an upper oven (110) and a lower oven (120) which are stacked up and down; wherein: The upper oven (110) comprises a first drying channel (111) on the upper layer, and a second drying channel (112) on the lower layer; The lower oven (120) comprises a third drying channel (121) on the upper layer, and a fourth drying channel (122) on the lower layer; Furthermore, the two drying channels in the upper oven (110) and the lower oven (120) are separated by a partition to form an independent temperature control area.

4. The double-layer folding coating device (10) according to claim 3, characterized in that: The upper oven (110) and the lower oven (120) both comprise an oven body (101), an air nozzle (102) disposed in the oven body (101) and used for baking the electrode sheets, and a baking conveying roller (103) corresponding to the air nozzle (102) and disposed in the oven body (101); The position correspondence between the air nozzles (102) and the baking conveyor rollers (103) in the upper oven (110) and the lower oven (120) is opposite, and the position correspondence between the air nozzles (102) and the conveyor rollers in the upper and lower drying channels of the upper oven (110) and the lower oven (120) is the same.

5. The double-layer folding coating device (10) according to claim 3, characterized in that: The first drying channel (111) and the fourth drying channel (122) perform secondary baking on the A surface of the electrode piece; and the second drying channel (112) and the third drying channel (121) perform secondary baking on the B surface of the electrode piece.

6. The double-layer folding coating device (10) according to claim 1, characterized in that: The outer rotating assembly (510) and the inner rotating assembly (520) have no less than three rollers, and both the outer rotating assembly (510) and the inner rotating assembly (520) have a deviation correction function.

7. The double-layer folding coating device (10) according to claim 1, characterized in that: The unwinding and rewinding mechanism comprises a pole piece unwinding assembly (310) and a first folding and traction assembly (320) arranged corresponding to a feeding end of the dual-channel oven mechanism (100), and a pole piece rewinding assembly (330) and a second folding and traction assembly (340) arranged corresponding to a discharging end of the dual-channel oven mechanism (100); and the first folding and traction assembly (320) and the second folding and traction assembly (340) are arranged between the pole piece unwinding assembly (310) and the pole piece rewinding assembly (330).

8. The double-layer folding coating device (10) according to claim 1, characterized in that: It also includes a roll deviation correction mechanism, which includes an unwinding deviation correction component (410) arranged corresponding to the feeding end of the dual-channel oven mechanism (100), and a rewinding deviation correction component (420) arranged corresponding to the discharging end of the dual-channel oven mechanism (100).

9. The double-layer folding coating device (10) according to claim 8, characterized in that: The roll deflection correction mechanism further comprises a first traction deflection correction component (430) arranged corresponding to the feeding end of the dual-channel oven mechanism (100), and a second traction deflection correction component (440) arranged corresponding to the discharging end of the dual-channel oven mechanism (100).

10. A coating system, characterized in that: include: The double-layer return coating device (10) according to any one of claims 1 to 9, used for coating and return baking the two sides of the electrode respectively; and a thickness measuring device (20), which is arranged corresponding to the double-layer fold-back coating device (10) and is used to detect the coating thickness on both sides of the electrode piece.

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