Lithium battery foil coating equipment integrating prime coating and tab coating

Abstract

The invention provides lithium battery foil coating equipment integrating prime coating and tab coating, and belongs to the technical field of lithium battery manufacturing, the lithium battery foil coating equipment comprises a control system, an unwinding mechanism, a corona mechanism, a material traction mechanism, a prime coating gluing mechanism, a drying oven assembly and a winding mechanism, the prime coating gluing mechanism comprises a prime coating device and a gluing device, the bottom coating device comprises a bottom coating rack, the bottom coating rack is provided with a bottom coating scraper, a glue pressing roller and a gravure roller, the gluing device comprises a gluing rack, and the gluing rack is provided with a gluing scraper, a plurality of back rollers and a micro-concave roller. Two coating processes can be completed on one device at the same time, the production efficiency of the device is improved, and meanwhile the problems of thick edge effect, film surface line shape, bubble and pinhole defects of an extrusion coating machine are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and more particularly to a lithium battery foil coating device integrating primer coating and tab coating. Background Art

[0002] Lithium batteries are high-energy-density rechargeable batteries widely used in fields such as consumer electronics, electric vehicles, and energy storage systems. The positive electrode of a lithium battery is the electrode material for storing and releasing lithium ions. In the manufacturing of the positive electrode of a lithium battery, lithium battery foil is usually used as the positive electrode current collector substrate, and primer coating and tab coating are performed on the lithium battery foil. Primer coating is to coat the corresponding slurry on the surface of the aluminum foil, and tab coating is to coat a material with specific functions in the tab area.

[0003] Most of the existing lithium battery foil coating devices are of two types. One is a gravure coater. When this coating device is used for primer coating on aluminum foil, since the coating thickness is only 0.5 - 1 μm, its coating speed can reach 120 - 180 m / min, and the production efficiency is high. However, it can only perform primer coating and does not have the function of tab gluing, and additional tab gluing equipment and processes are required.

[0004] The other is an extrusion coater, which adopts a double-chamber structure of the die head to complete primer coating and tab coating simultaneously. However, since the slurry is forced out by pressure, in order to maintain the continuous flow of the slurry, the thickness of the active material coated is 20 - 30 μm, and ultra-thin coating cannot be achieved. Subsequently, it is also necessary to ensure the drying of the coating. Its coating speed is 50 - 80 m / min, and the production efficiency is low. Moreover, the extrusion coater also has the following problems:

[0005] 1. Thick edge effect: The coating thickness at the tab edge is significantly higher than that in the middle area, and a bulging edge is formed after drying, resulting in uneven roller pressing density, warping of the electrode sheet, and even fracture in the subsequent process.

[0006] 2. Linear defects on the film surface: When foreign objects are stuck in the die head slit, or the coating gap between the die head and the foil is not adjusted properly, or there are hard particles on the surface of the substrate, linear defects will occur in the tab glue.

[0007] 3. Bubble and pinhole defects: Bubbles are mixed in during the slurry stirring or transportation process, and pinhole defects are easily formed on the film surface after extrusion from the die head. Summary of the Invention

[0008] The purpose of the present invention is to provide a lithium battery foil coating device integrating primer coating and tab coating and its control method, so as to solve the problems in the above-mentioned existing technology that the existing gravure coater for lithium battery foil can only perform primer coating, and the extrusion coater cannot perform ultra-thin coating for tab coating, has a slow coating speed, and also has problems such as thick edge effect, linearity on the film surface, bubbles and pinholes.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] A lithium battery foil coating device integrating primer coating and tab coating, comprising a control system, an unwinding mechanism, a corona mechanism, a material pulling mechanism, a primer coating mechanism, an oven assembly and a winding mechanism; the primer coating mechanism includes a primer coating device and a glue coating device, the primer coating device includes a primer coating frame, on which a primer coating blade, a glue pressing roller and an intaglio roller are provided, the glue coating device includes a glue coating frame, on which a glue coating blade, several back rollers and a micro intaglio roller are provided, the primer coating mechanism includes a front coating module for coating the A side of the foil and a reverse coating module for coating the B side of the foil, and the foil enters the corona mechanism, the material pulling mechanism, the front coating module and the oven assembly in sequence from the unwinding mechanism to complete the drying of the coating for primer coating and glue coating on the A side, and then enters the reverse coating module and the oven assembly to complete the drying of the coating for primer coating and glue coating on the B side.

[0011] Further, the foil includes a foil body, a primer coating area and a glue coating area, several primer coating areas are arranged at intervals on the foil body, glue coating areas are arranged on both sides of the primer coating area, and the gap between the glue coating area and the primer coating area is 0.5-1.0 mm.

[0012] Further, the primer coating device further includes a primer coating sliding part fixedly connected to the glue pressing roller, the primer coating sliding part is connected with a primer coating power part, the primer coating power part includes a servo motor and a ball screw, and the output end of the servo motor is connected with the ball screw through a coupling; the primer coating sliding part includes a primer coating straight guide rail, a primer coating slider and a primer coating connecting seat, the primer coating straight guide rail is fixed on the primer coating frame, the primer coating slider can slide up and down along the primer coating straight guide rail, the primer coating slider is connected with the glue pressing roller through the primer coating connecting seat, and when the servo motor operates, it drives the glue pressing roller to rise or fall; a magnetic bar is installed at the incoming material end of the primer coating frame to adsorb iron filings on the film surface of the foil before coating, a primer coating adjusting roller is further arranged on the primer coating frame, the primer coating adjusting roller is installed above the primer coating device, a primer coating tool holder is arranged under the primer coating blade, and the primer coating tool holder is fixed on the primer coating frame; the intaglio roller is provided with an intaglio roller body with through holes at both ends, several primer coating reticulated roller surfaces are arranged at positions corresponding to the primer coating areas designed on the foil on the roller body, and a primer coating material tray is arranged under the intaglio roller; a feed port and a discharge port are arranged at the bottom of the primer coating material tray.

[0013] Further, the glue coating device further includes a glue coating sliding part, the glue coating sliding part is connected with a glue coating power part, the glue coating power part includes a glue coating cylinder, the glue coating sliding part includes a glue coating straight guide rail, a glue coating slider and a glue coating connecting seat, the glue coating straight guide rail is fixed on the glue coating machine frame, the glue coating slider can slide left and right along the glue coating straight guide rail, the glue coating slider is connected with the micro-embossing roll through the glue coating connecting seat, when the glue coating cylinder acts, it drives the micro-embossing roll to move away from or close to the back roll; the glue coating machine frame is fixed at the discharging end of the primer coating machine frame, and a glue coating adjusting roll is further arranged between the glue coating machine frame and the back roll; a glue coating knife rest is arranged under the glue coating scraper, and the glue coating knife rest is fixed on the glue coating sliding part; the micro-embossing roll includes a micro-embossing roll body, a circular ring is arranged at the position corresponding to the glue coating area designed for the foil on the micro-embossing roll body, the surface of the circular ring is provided with a glue coating reticulated roll surface, and a plurality of glue coating trays are arranged under the micro-embossing roll, and each glue coating tray corresponds to apply the tab glue for the glue coating area of the foil; the glue coating device is further provided with a glue coating detection device, the glue coating detection device includes a linear module, the linear module is arranged at the output end of the glue coating device, and a color registration electric eye is arranged on the linear module.

[0014] Further, the oven assembly includes a plurality of ovens, each oven is divided into upper and lower baking layers, each baking layer includes a plurality of groups of air nozzles and over rollers arranged oppositely up and down, the foil moves on the over rollers, and the air nozzles blow hot air to the coated side of the primer coating and glue coating of the foil; the baking layer is divided into an upper baking layer and a lower baking layer, the lower baking layer is used for drying the coating of the A side primer coating and glue coating of the foil output by the positive coating module, and a first deviation rectifying module is arranged at the output end of the lower baking layer; the upper baking layer is used for drying the coating of the B side primer coating and glue coating of the foil output by the reverse coating module, and a second deviation rectifying module is arranged at the output end of the upper baking layer.

[0015] Further, the lithium battery foil coating equipment further includes a plurality of tension rollers, the tension rollers are respectively arranged on the unwinding mechanism, the material pulling mechanism, the reverse coating module and the winding mechanism, and are used for feeding back the tension values between the above mechanisms.

[0016] Further, the unwinding mechanism includes an unwinding reel, the tension roller and an unwinding floating roller, the unwinding reel is driven by a motor to unwind the material, the foil passes through the tension roller and the unwinding floating roller in sequence from the unwinding reel and enters the corona mechanism, the tension roller detects the real-time tension of the foil and feeds the data back to the control system, and the unwinding floating roller dynamically adjusts the foil tension through floating displacement according to the real-time data feedback.

[0017] Further, the material pulling mechanism includes a rubber roller, a steel roller, and a tension roller. The steel roller is a driving roller, and the rubber roller is a passive pressing roller. The steel roller and the rubber roller are used in cooperation to convey the foil forward together. The material pulling mechanism is divided into an inlet material pulling device and an outlet material pulling device. The inlet material pulling device is arranged between the corona treatment mechanism and the front coating module, and the outlet material pulling device is arranged between the second deviation rectification module and the winding mechanism.

[0018] Further, the winding mechanism includes a winding disc, the tension roller, and a winding floating roller. The winding disc drives the material winding through a motor. The foil passes through the tension roller and the winding floating roller in sequence from the outlet material pulling device and then enters the winding disc. The tension roller detects the real-time tension of the foil and feeds the data back to the control system. The winding floating roller dynamically adjusts the foil tension through floating displacement according to the real-time data feedback.

[0019] Further, the integrated lithium-ion battery foil coating equipment for bottom coating and tab coating is applicable to the coating of lithium-ion battery foils with a tab coating thickness of 0.5 - 6 μm.

[0020] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The coating equipment of the present invention integrates bottom coating and tab coating. Through the linkage design of coating the A side of the foil by the front coating module and coating the B side of the foil by the reverse coating module, it uses a bottom coating scraper, a rubber pressing roller, and an intaglio roller for bottom coating, and a coating glue scraper, several back rollers, and a gravure roller for tab coating. The coating speeds of the bottom coating and the tab glue are adjusted to be consistent, realizing the continuous coating of both sides of the foil with bottom coating and tab glue, reducing the process switching time of traditional step-by-step coating, and improving production efficiency.

[0022] The unwinding mechanism and the winding mechanism of the coating equipment of the present invention both adopt a dynamic feedback system of floating rollers plus tension rollers, combined with the design of the steel roller driving actively and the rubber roller driving passively in the material pulling mechanism, eliminating the tension fluctuation during the running of the foil, preventing the foil from wrinkling or stretching and deforming; using the upper drying layer to dry the B side of the foil and the lower drying layer to dry the A side of the foil, without step-by-step treatment or flipping the foil, shortening the production cycle; and each drying layer is configured with multiple groups of air nozzles and guide rollers, using hot air to directly blow to the coating surface, accelerating the volatilization of the solvent and avoiding uneven heating of the foil, reducing heat energy waste; adopting an intelligent detection system of magnetic bar pre-cleaning, color registration electric eye online monitoring, and real-time tension feedback, integrating the whole process data into the control system, and realizing automatic optimization of process parameters and fault warning.

[0023] The integrated lithium-ion battery foil coating equipment for bottom coating and tab coating of the present invention also solves three problems of the existing extrusion coating machine:

[0024] 1. In the glue - coating area, a combination of a gravure roll and a backup roll is adopted. The circular anilox roll surface of the gravure roll corresponds to the tab glue area. The amount of slurry transfer is precisely controlled through the depth and distribution of the cells, avoiding excessive edge accumulation. Through the adjustable gap between the coating doctor blade and the gravure roll, the uniformity of the slurry layer is ensured. Multiple groups of air nozzles on the upper drying layer or lower drying layer of the oven are used to blow the coating surface of side A or side B of the foil in a directional manner, accelerating the evaporation of the edge solvent and reducing the difference in drying shrinkage. During the drying process of the foil, over - rollers are used for flat support to suppress the edge warping caused by thermal deformation, solving the problem of thick - edge effect.

[0025] 2. A magnetic bar is installed at the incoming - material end of the primer - coating rack to adsorb hard particles such as iron filings on the surface of the foil, avoiding scratching the coating. At the same time, in the primer - coating device, a servo motor and a ball screw are used to drive the glue - pressing roll to lift, and the gap between the gravure roll and the foil is adjusted in real time to ensure uniform coating pressure. In the glue - coating device, a glue - coating cylinder is used to drive the gravure roll and the backup roll to disengage and engage, avoiding foreign objects getting stuck in the die slit. Finally, laser engraving is used on both the primer - coating anilox roll surface of the gravure roll and the glue - coating anilox roll surface of the gravure roll, with the slit precision reaching the micron level, reducing the fluctuation of slurry extrusion and solving the problem of linear streaks on the film surface.

[0026] 3. An inlet and an outlet are provided at the bottom of the primer - coating tray to form a circulating flow, avoiding the precipitation of air bubbles due to the static state of the slurry. The up - and - down height, angle of the primer - coating doctor blade, and the distance from the primer - coating doctor blade to the gravure roll are adjusted through the primer - coating knife holder, so that the cutting edge of the primer - coating doctor blade is closely attached to the roll surface of the gravure roll. The glue - coating knife holder can adjust the up - and - down height, angle of the glue - coating doctor blade, and the distance to the gravure roll of the glue - coating doctor blade, so that the cutting edge of the glue - coating doctor blade is closely attached to the roll surface of the gravure roll, causing the primer - coating doctor blade or the glue - coating doctor blade to break tiny air bubbles when shearing the slurry, solving the problems of air bubbles and pinholes.

[0027] In summary, when coating lithium - ion battery foil with a tab - coating thickness of 0.5 - 6 μm, the glue - coating device is integrated into the gravure coating equipment, enabling two coating processes to be completed simultaneously on one device. While improving the production efficiency of the equipment, it also solves the defects of thick - edge effect, linear streaks on the film surface, air bubbles and pinholes in the extrusion coater. Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the overall structure of a lithium - ion battery foil coating equipment integrating primer - coating and tab - coating;

[0029] Figure 2 It is a schematic diagram of the front - coating module structure of a lithium - ion battery foil coating equipment integrating primer - coating and tab - coating;

[0030] Figure 3 It is a schematic diagram of the reverse - coating module structure of a lithium - ion battery foil coating equipment integrating primer - coating and tab - coating;

[0031] Figure 4Schematic diagram of the foil structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0032] Figure 5 Partial schematic diagram of the foil of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0033] Figure 6 Schematic diagram of the gravure roll structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0034] Figure 7 Cross-sectional view of the primer coating anilox roll surface of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0035] Figure 8 Schematic diagram of the microgravure roll structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0036] Figure 9 Cross-sectional view of the glue coating anilox roll surface of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0037] Figure 10 Schematic diagram of the unwind mechanism structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0038] Figure 11 Schematic diagram of the entry pulling device structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0039] Figure 12 Schematic diagram of the exit pulling device structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0040] Figure 13 Schematic diagram of the oven structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0041] Figure 14 Schematic diagram of the winding mechanism structure of a lithium-ion battery foil coating equipment integrating primer coating and tab coating;

[0042] In the figure, 100 - unwinding mechanism, 101 - tension roller, 102 - floating roller, 103 - unwinding reel, 200 - corona mechanism, 301 - steel roller, 302 - rubber roller, 310 - inlet traction device, 320 - outlet traction device, 410 - front coating module, 4101 - primer coating device, 4102 - glue coating device, 411 - primer coating power unit, 4111 - servo motor, 4112 - ball screw, 412 - primer coating sliding part, 4121 - primer coating linear guide, 4122 - primer coating slider, 4123 - primer coating connecting seat, 413 - primer coating frame, 4131 - primer coating tool holder, 4132 - primer coating material tray, 41321 - feed port, 41322 - discharge port, 4141 - glue pressing roller, 4142 - gravure roller, 41421 - primer coating anilox roll surface, 4143 - primer coating adjusting roller, 415 - glue coating power unit, 4151 - glue coating cylinder, 416 - glue coating sliding part, 4161 - glue coating linear guide, 4162 - glue coating slider, 4163 - glue coating connecting seat, 4171 - back roller, 4172 micro - gravure roller, 41721 - glue coating anilox roll surface, 4173 - glue coating squeegee, 4174 - glue coating tool holder, 4175 - glue coating material tray, 4181 - linear module, 4182 - color register electric eye, 4191 - magnetic bar, 420 - reverse coating module, 510 - first deviation rectification module, 520 - second deviation rectification module, 600 - oven assembly, 610 - oven, 611 - upper baking layer, 612 - lower baking layer, 613 - air nozzle, 614 - idler roller, 700 - foil material, 710 - primer coating area, 720 - glue coating area, 800 - winding mechanism, 801 - winding reel. Detailed implementation mode

[0043] The following details the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only for explaining and interpreting the present invention and cannot be used to limit the present invention.

[0044] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also have other embodiments and variations. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0045] As Figures 1-3As shown in the figure, a lithium battery foil coating device integrating primer coating and tab coating includes a control system, an unwinding mechanism 100, a corona mechanism 200, a material pulling mechanism, a primer coating mechanism, an oven 610 assembly 600, and a winding mechanism 800; the primer coating mechanism includes a primer coating device 4101 and a glue coating device 4102, the primer coating device 4101 includes a primer coating frame 413, on which a primer coating knife, a glue pressing roller 4141, and an intaglio roller 4142 are provided, the glue coating device 4102 includes a glue coating frame, on which a glue coating knife 4173, a plurality of back rollers 4171, and a micro intaglio roller 4172 are provided, the primer coating and glue coating mechanism includes a front coating module 410 for coating the A side of the foil 700 and a reverse coating module 420 for coating the B side of the foil 700, and the foil 700 enters the corona mechanism 200, the material pulling mechanism, the front coating module 410, and the oven 610 assembly 600 in sequence from the unwinding mechanism 100 to complete the drying of the coating for A side primer coating and glue coating, and then enters the reverse coating module 420 and the oven 610 assembly 600 to complete the drying of the coating for B side primer coating and glue coating.

[0046] As Figures 4-5 shown, the foil 700 includes a foil 700 body, a primer coating area 710, and a glue coating area 720. A plurality of the primer coating areas 710 are arranged at intervals on the foil 700 body, the glue coating areas 720 are provided on both sides of the primer coating area 710, and the gap between the glue coating area 720 and the primer coating area 710 is 0.5 - 1.0 mm.

[0047] As Figure 2As shown, the primer coating device 4101 further includes a primer coating sliding part 412 fixedly connected to the rubber pressing roller 4141. The primer coating sliding part 412 is connected to a primer coating power part 411. The primer coating power part 411 includes a servo motor 4111 and a ball screw 4112. The output end of the servo motor 4111 is connected to the ball screw 4112 through a coupling; the primer coating sliding part 412 includes a primer coating straight guide rail 4121, a primer coating slider 4122 and a primer coating connecting seat 4123. The primer coating straight guide rail 4121 is fixed on the primer coating frame 413. The primer coating slider 4122 can slide up and down along the primer coating straight guide rail 4121. The primer coating slider 4122 is connected to the rubber pressing roller 4141 through the primer coating connecting seat 4123. When the servo motor 4111 operates, it drives the rubber pressing roller 4141 to rise or fall; a magnetic bar 4191 is installed at the incoming material end of the primer coating frame 413. The magnetic bar 4191 adsorbs iron filings on the film surface of the foil 700 before coating. A primer coating adjusting roller is also provided on the primer coating frame 413. The primer coating adjusting roller is installed above the primer coating device 4101. Before coating, the foil 700 precisely adjusts the tension, flatness and traveling path of the foil 700 through the primer coating adjusting roller to ensure that the surface of the foil 700 is flat and free of wrinkles before coating; a primer coating knife holder 4131 is provided under the primer coating blade. The primer coating knife holder 4131 is fixed on the primer coating frame 413. Through the primer coating knife holder 4131, the up and down height, angle of the primer coating blade and the distance between the primer coating blade and the gravure roller 4142 can be adjusted; a primer coating tray 4132 is provided under the gravure roller 4142. The bottom of the primer coating tray 4132 is provided with a feed port 41321 and a discharge port 41322.

[0048] As Figure 2As shown in the figure, the glue coating device 4102 further includes a glue coating sliding part 416. The glue coating sliding part 416 is connected to a glue coating power part 415. The glue coating power part 415 includes a glue coating cylinder 4151. The glue coating sliding part 416 includes a glue coating straight guide rail 4161, a glue coating slider 4162 and a glue coating connecting seat 4163. The glue coating straight guide rail 4161 is fixed on the glue coating machine frame. The glue coating slider 4162 can slide left and right along the glue coating straight guide rail 4161. The glue coating slider 4162 is connected to the micro gravure roll 4172 through the glue coating connecting seat 4163. When the glue coating cylinder 4151 acts, it drives the micro gravure roll 4172 to move away from or close to the back roll 4171. The discharging end of the primer coating machine frame 413 is fixed with the glue coating machine frame. A glue coating adjusting roll is further arranged between the glue coating machine frame and the back roll 4171. Before glue coating, the glue coating adjusting roll adjusts the tension and alignment of the foil 700 in the glue coating stage. A glue coating knife holder 4174 is arranged under the glue coating knife 4173. The glue coating knife holder 4174 is fixed on the glue coating sliding part 416. The glue coating knife holder 4174 can adjust the up and down height, angle and the distance to the micro gravure roll 4172 of the glue coating knife 4173. A number of glue coating trays 4175 are arranged under the micro gravure roll 4172. Each glue coating tray 4175 corresponds to applying the tab glue in the glue coating area 720 of the foil 700. The micro gravure roll 4172 applies glue in an inverse coating manner. The inverse coating means that the rotation direction of the micro gravure roll 4172 is opposite to the advancing direction of the foil 700. The transfer amount and coating uniformity of the tab glue are precisely controlled through the reverse shear force. There are two back rolls 4171, which are fixed on the primer coating bottom frame. The closer the distance between the two back rolls 4171 is, the better. It can reduce the vibration of the foil 700 between the two back rolls 4171. The glue coating device is also provided with a glue coating detection device. The glue coating detection device includes a linear module 4181. The linear module 4181 is arranged at the output end of the glue coating device 4102. A color registration electric eye 4182 is arranged on the linear module 4181. The color registration electric eye 4182 is used to detect whether the size of the glue coating area 720 of the foil 700 meets the design requirements.

[0049] As Figures 6-9 shown in the figure, the gravure roll 4142 is provided with a gravure roll 4142 body with a hollow through both ends. A number of primer coating reticulated roller surfaces 41421 are arranged on the roller body corresponding to the designed primer coating area 710 of the foil 700. The micro gravure roll 4172 includes a micro gravure roll 4172 body. A ring is arranged on the micro gravure roll 4172 body corresponding to the designed glue coating area 720 of the foil 700. The ring surface is provided with a glue coating reticulated roller surface 41721. The primer coating reticulated roller surfaces 41421 of the gravure roll 4142 and the glue coating reticulated roller surfaces 41721 of the micro gravure roll 4172 are both laser engraved, and the slit accuracy reaches the micron level, reducing the slurry extrusion fluctuation.

[0050] As shown in Figure 1 and 13 Figure [not provided], the oven assembly 600 includes a number of ovens 610. Each oven 610 is divided into upper and lower baking layers. Each baking layer includes multiple groups of air nozzles 613 and over rollers 614 arranged oppositely up and down. The foil material 700 moves on the over rollers 614, and the air nozzles 613 blow hot air onto the coated side of the foil material 700 for primer coating and glue coating. The baking layer is divided into an upper baking layer 611 and a lower baking layer 612. The lower baking layer 612 is used to dry the coating of the A side of the foil material 700 output by the positive coating module 410 for primer coating and glue coating. A first deviation correction module 510 is provided at the output end of the lower baking layer 612, and the first deviation correction module 510 is used to correct the sheet path of the foil material 700 at the output end of the upper baking layer 611. The upper baking layer 611 is used to dry the coating of the B side of the foil material 700 output by the reverse coating module 420 for primer coating and glue coating. A second deviation correction module 520 is provided at the output end of the upper baking layer 611, and the second deviation correction module 520 is used to correct the sheet path of the foil material 700 at the output end of the lower baking layer 612.

[0051] As shown in Figure 1 Figure [not provided], the lithium battery foil material 700 coating equipment further includes a number of tension rollers 101, which are respectively arranged on the unwinding mechanism 100, the material pulling mechanism, the reverse coating module 420 and the winding mechanism 800, and are used to feedback the tension values between the above-mentioned mechanisms.

[0052] As shown in Figure 10 Figure [not provided], the unwinding mechanism 100 includes an unwinding reel 103, the tension roller 101 and an unwinding floating roller 102. The unwinding reel 103 drives the material to be unwound by a motor. The foil material 700 passes through the tension roller 101 and the unwinding floating roller 102 in sequence from the unwinding reel 103 and enters the corona treatment mechanism 200. The tension roller 101 detects the real-time tension of the foil material 700 and feeds the data back to the control system. The unwinding floating roller 102 dynamically adjusts the tension of the foil material 700 through floating displacement according to the real-time data feedback, absorbs fluctuations and maintains stability to ensure a smooth coating process. The unwinding mechanism 100 adopts overall deviation correction.

[0053] As shown in Figure 1 Figure [not provided], the corona treatment mechanism 200 is provided with multiple corona treatment machines. Through the high-voltage discharge of the corona treatment machines, the oil stains on the surface of the foil material 700 are vaporized, increasing the adhesion of the surface of the foil material 700 during subsequent coating.

[0054] As shown in Figures 11-12As shown in the figure, the material feeding mechanism includes a rubber roller 302, a steel roller 301 and the tension roller 101. The steel roller 301 is a driving roller that provides power to traction the foil material 700 for stable transportation. The rubber roller 302 is a passive pressing roller that increases the friction force through elastic contact and protects the surface of the foil material 700 to prevent slipping or scratching. There is a tension detection between the material feeding mechanism and the positive coating mechanism. The steel roller 301 and the rubber roller 302 are used in cooperation, and the two work together to convey the foil material 700 forward. The material feeding mechanism is divided into an inlet feeding device 310 and an outlet feeding device 320. The inlet feeding device 310 is arranged between the corona mechanism 200 and the positive coating module 410, and the outlet feeding device 320 is arranged between the second deviation correction module 520 and the winding mechanism 800.

[0055] As Figure 14 shown in the figure, the winding mechanism 800 is located at the final position of the whole machine and includes a winding disk 801, the tension roller 101 and a winding floating roller 102. The winding disk 801 is driven by a motor for winding. The foil material 700 passes through the tension roller 101 and the winding floating roller 102 in sequence from the outlet feeding device 320 and enters the winding disk 801. The tension roller 101 detects the real-time tension of the foil material 700 and feeds the data back to the control system. The winding floating roller 102 dynamically adjusts the tension of the foil material 700 through floating displacement according to the real-time data feedback, absorbs fluctuations and maintains stability to ensure the smoothness of the coating process. The whole forms a closed loop. The winding adopts overall deviation correction. The winding mechanism 800 has a deviation correction function and can correct according to different dislocation situations of the foil material 700.

[0056] As Figure 1 shown in the figure, the lithium-ion battery foil material 700 coating equipment integrating bottom coating and tab coating is a two-layer structure. The first layer is provided with the reverse coating module 420, the unwinding mechanism 100, the corona mechanism 200, the inlet feeding device 310, the positive coating module 410, the outlet feeding device 320 and the winding mechanism 800 from left to right. The second layer is provided with the first deviation correction module 510, the oven assembly 600 and the second deviation correction module 520 from left to right.

[0057] In actual implementation, the lithium-ion battery foil material 700 coating equipment integrating bottom coating and tab coating is applicable to the coating of lithium-ion battery foil materials 700 with a tab coating thickness of 0.5 - 6u.

[0058] The process flow of the lithium-ion battery foil material coating equipment integrating bottom coating and tab coating of the present invention is as follows:

[0059] S1, Unwinding: The foil material 700 starts to be released from the unwinding disk 103 of the unwinding mechanism 100, passes through the tension roller 101 and the unwinding floating roller 102, and enters the corona mechanism 200.

[0060] S2, Corona treatment: The foil 700 is within the corona mechanism 200, and the high-voltage discharge of the corona machine treats the surface of the foil 700 to improve the wettability and adhesion of the surface of the foil 700;

[0061] S3, Inlet traction and conveyance: The foil 700 sequentially passes through the rubber roller 302, the steel roller 301, and the tension roller 101 of the inlet traction device 310 and enters the front coating module 410;

[0062] S4, Coating and drying of side A of the foil 700: The foil 700 simultaneously completes the primer coating and glue coating of side A of the foil 700 through the primer coating device 4101 and the glue coating device 4102 in the front coating module 410, and then enters the lower drying layer 612 of the oven assembly 600 to dry side A of the foil 700. After side A of the foil 700 is dried, it enters the first deviation correction module 510 for deviation correction;

[0063] S5, Coating and drying of side B of the foil 700: The foil 700 simultaneously completes the primer coating and glue coating of side B of the foil 700 through the primer coating device 4101 and the glue coating device 4102 in the reverse coating module 420, and then enters the upper drying layer 611 of the oven assembly 600 to dry side B of the foil 700. After side B of the foil 700 is dried, it enters the second deviation correction module 520 for deviation correction;

[0064] S6, Outlet traction and conveyance: The coated foil 700 passes through the tension roller 101, the steel roller 301, and the rubber roller 302 of the outlet traction device 320 and enters the winding mechanism 800;

[0065] S7, Winding: The coated foil 700 passes through the winding floating roller 102 and the tension roller 101 and is wound onto the winding reel 801.

[0066] It should be understood that the above embodiments are one or more embodiments of the present invention. Based on the present invention, there are many other embodiments and their variations. When ordinary technicians in this industry do not make pioneering innovations, the variations and modifications made through the present invention all fall within the protection scope of the present invention.

Claims

1. A lithium-ion battery foil coating device integrating primer coating and tab coating, characterized in that, It includes a control system, an unwinding mechanism, a corona mechanism, a material pulling mechanism, a primer coating and gluing mechanism, an oven assembly and a winding mechanism; the primer coating and gluing mechanism includes a primer coating device and a gluing device, the primer coating device includes a primer coating frame, on which a primer coating blade, a rubber pressing roller and an intaglio roller are provided, the gluing device includes a gluing frame, on which a gluing blade, several back rollers and a gravure roller are provided, the primer coating and gluing mechanism includes a front coating module for coating the A side of the foil and a reverse coating module for coating the B side of the foil, and the foil sequentially enters the corona mechanism, the material pulling mechanism, the front coating module and the oven assembly from the unwinding mechanism to complete the drying of the primer coating and gluing coating on the A side, and then enters the reverse coating module and the oven assembly to complete the drying of the primer coating and gluing coating on the B side.

2. The lithium-ion battery foil coating equipment integrating primer coating and tab coating according to claim 1, wherein: The foil includes a foil body, a primer coating area and a gluing area, several of the primer coating areas are arranged at intervals on the foil body, the gluing areas are arranged on both sides of the primer coating area, and the gap between the gluing area and the primer coating area is 0.5 - 1.0 mm.

3. The lithium-ion battery foil coating equipment integrating primer coating and tab coating according to claim 2, characterized in that: The primer coating device further includes a primer coating sliding part fixedly connected to the rubber pressing roller, the primer coating sliding part is connected with a primer coating power part, the primer coating power part includes a servo motor and a ball screw, and the output end of the servo motor is connected to the ball screw through a coupling; the primer coating sliding part includes a primer coating straight guide rail, a primer coating slider and a primer coating connecting seat, the primer coating straight guide rail is fixed on the primer coating frame, the primer coating slider can slide up and down along the primer coating straight guide rail, the primer coating slider is connected to the rubber pressing roller through the primer coating connecting seat, and when the servo motor operates, it drives the rubber pressing roller to rise or fall; a magnetic bar is installed at the incoming material end of the primer coating frame, the magnetic bar adsorbs iron filings on the film surface of the foil before coating, a primer coating adjusting roller is further provided on the primer coating frame, the primer coating adjusting roller is installed above the primer coating device, a primer coating tool holder is provided under the primer coating blade, and the primer coating tool holder is fixed on the primer coating frame; the intaglio roller is provided with an intaglio roller body with a hollow through both ends, several primer coating reticulated roller surfaces are arranged at positions corresponding to the primer coating areas designed for the foil on the roller body, and a primer coating material tray is provided under the intaglio roller; the bottom of the primer coating material tray is provided with a feed inlet and a discharge outlet.

4. The integrated lithium foil coating equipment for primer coating and tab coating according to claim 3, wherein: The glue coating device further includes a glue coating sliding part, the glue coating sliding part is connected with a glue coating power part, the glue coating power part includes a glue coating cylinder, the glue coating sliding part includes a glue coating straight guide rail, a glue coating slider and a glue coating connecting seat, the glue coating straight guide rail is fixed on the glue coating machine frame, the glue coating slider can slide left and right along the glue coating straight guide rail, the glue coating slider is connected with the micro-embossing roller through the glue coating connecting seat, when the glue coating cylinder acts, it drives the micro-embossing roller to move away from or close to the back roller; the discharging end of the primer coating machine frame is fixed with the glue coating machine frame, and a glue coating adjusting roller is further arranged between the glue coating machine frame and the back roller; a glue coating knife rest is arranged under the glue coating scraper, and the glue coating knife rest is fixed on the glue coating sliding part; the micro-embossing roller includes a micro-embossing roller body, a circular ring is arranged at the position corresponding to the glue coating area designed for the foil on the micro-embossing roller body, the circular ring surface is provided with a glue coating reticulated roller surface, and several glue coating material trays are arranged under the micro-embossing roller, and each glue coating material tray corresponds to the tab glue for coating the glue coating area of the foil; the glue coating device is further provided with a glue coating detection device, the glue coating detection device includes a linear module, the linear module is arranged at the output end of the glue coating device, and a color registration electric eye is arranged on the linear module.

5. The lithium-ion battery foil coating equipment integrating primer coating and tab coating according to claim 4, characterized in that: The oven assembly includes several ovens, each oven is divided into upper and lower baking layers, each baking layer includes multiple groups of upper and lower opposite air nozzles and guide rollers, the foil moves on the guide rollers, and the air nozzles blow hot air to the coated side of the primer coating and glue coating of the foil; the baking layer is divided into an upper baking layer and a lower baking layer, the lower baking layer is used for drying the coating of the A side primer coating and glue coating of the foil output by the front coating module, and a first deviation rectifying module is arranged at the output end of the lower baking layer; the upper baking layer is used for drying the coating of the B side primer coating and glue coating of the foil output by the reverse coating module, and a second deviation rectifying module is arranged at the output end of the upper baking layer.

6. The lithium-ion battery foil coating device integrating primer coating and tab coating according to claim 1, wherein: The lithium battery foil coating equipment further includes several tension rollers, and the tension rollers are respectively arranged on the unwinding mechanism, the material pulling mechanism, the reverse coating module and the winding mechanism for feeding back the tension values between the above mechanisms.

7. The lithium battery foil coating equipment integrating primer coating and tab coating according to claim 1, wherein: The unwinding mechanism includes an unwinding reel, the tension roller and an unwinding floating roller, the unwinding reel drives the material to be unwound through a motor, the foil passes through the tension roller and the unwinding floating roller in sequence from the unwinding reel and enters the corona treatment mechanism, the tension roller detects the real-time tension of the foil and feeds the data back to the control system, and the unwinding floating roller dynamically adjusts the foil tension through floating displacement according to the real-time data feedback.

8. The lithium-ion battery foil coating device integrating primer coating and tab coating according to claim 5, characterized in that: The material pulling mechanism includes a rubber roller, a steel roller and a tension roller, the steel roller is a driving roller, the rubber roller is a passive pressing roller, and the two work together to convey the foil forward; the material pulling mechanism is divided into an inlet material pulling device and an outlet material pulling device, the inlet material pulling device is arranged between the corona treatment mechanism and the front coating module, and the outlet material pulling device is arranged between the second deviation rectifying module and the winding mechanism.

9. The integrated lithium foil coating equipment for primer coating and tab coating as claimed in claim 8, wherein: The rewinding mechanism includes a rewinding disc, the tension roller and the rewinding floating roller. The rewinding disc drives the material winding through a motor. The foil material enters the rewinding disc from the outgoing traction device through the tension roller and the rewinding floating roller in sequence. The tension roller detects the real-time tension of the foil material and feeds the data back to the control system; the rewinding floating roller dynamically adjusts the foil material tension through floating displacement according to the real-time data feedback.

10. The lithium-ion battery foil coating equipment integrating primer coating and tab coating according to any one of claims 1-9, characterized in that: The lithium-ion battery foil coating equipment integrating bottom coating and tab coating is applicable to the coating of lithium-ion battery foils with tab coating thicknesses ranging from 0.5 to 6 μm.

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