Lithium battery gravure extrusion and high-speed coating all-in-one machine

Abstract

The invention provides a lithium battery gravure extrusion and high-speed coating all-in-one machine, and belongs to the technical field of lithium battery manufacturing, the lithium battery gravure extrusion and high-speed coating all-in-one machine comprises a lithium battery foil, the lithium battery foil is coated through an unwinding system, a gravure double-sided coating system, an extrusion coating system and a winding system in sequence, and through the design that an extrusion oven drying layer is folded into three layers, the gravure extrusion and high-speed coating all-in-one machine is formed. The drying path length is obviously increased in a limited space, and the coating speed is increased; double-sided staggered tuyeres of the first drying layer form convection current, and outer eight / inner eight tuyeres are matched for use, so that single-sided heating warping is reduced, and the problem that a coating is easy to wrinkle and crack is solved; the lithium battery foil passes through the first drying layer and then enters the first out-of-oven switching mechanism, the first out-of-oven switching mechanism adopts an adsorption roller to be in contact with a dry surface, and the second out-of-oven switching mechanism adopts an air floating roller to suspend a non-dry surface, so that the combined design makes up for the mechanical support of a passing roller, and also can avoid the risk of coating damage caused by adhesion of a wet film to the passing roller.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a lithium battery gravure extrusion high-speed coating integrated machine. Background Art

[0002] The coating of lithium battery foil is one of the core processes in battery manufacturing. Its purpose is to evenly coat the active material slurry on the metal foil to form a coating with uniform thickness and no defects. Traditional coating technologies are divided into gravure coating and extrusion coating. Among them, gravure coating transfers the slurry through a gravure roller engraved with micron-level mesh holes, which is suitable for thin layer and high-precision coating; extrusion coating extrude the slurry through a slit die, which is suitable for high-viscosity slurry and thick coating. The gravure extrusion high-speed coating all-in-one machine combines the technical advantages of gravure coating and extrusion coating, saving equipment space, greatly improving the utilization rate, speed and precision of the equipment, and improving the drying efficiency and time of gravure coating and extrusion coating equipment; the gravure extrusion high-speed coating all-in-one machine can achieve a low COV value, ensure the uniformity of the coating surface density, and improve product quality. However, the existing lithium battery gravure extrusion high-speed coating all-in-one machine still has the following problems:

[0003] 1. Since the gravure coating is thin and dries quickly, its coating speed is about 100m / min; however, the extrusion coating is thicker, and the coating speed of a single extrusion coater is about 80m / min. When integrated into a gravure extrusion all-in-one machine, if the overall coating speed is 100m / min, then after drying in the extrusion coating oven, the coating is prone to wrinkling and cracking.

[0004] 2. The existing oven-out conversion mechanism is equipped with multiple rollers. The function of the rollers is to contact the two surfaces of the lithium battery foil, apply a certain amount of pressure and support to the lithium battery foil, eliminate the deformation of the lithium battery foil caused by the unevenness of the coating or thermal stress, and ensure that the lithium battery foil remains flat during the transmission process. However, during extrusion coating, the single-sided oven cannot completely dry the slurry on the lithium battery foil coating. When the rollers are in contact with the two surfaces of the lithium battery foil, the slurry on the lithium battery foil is easily attached to the rollers of the oven-out conversion mechanism, resulting in uneven coating and affecting the coating quality. Summary of the Invention

[0005] The purpose of the present invention is to provide a lithium battery gravure extrusion high-speed coating integrated machine and a control method thereof, so as to solve the problems raised by the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A lithium battery gravure extrusion high-speed coating integrated machine includes a lithium battery foil, which is coated in sequence through an unwinding system, a gravure double-sided coating system, an extrusion coating system, and a winding system. The extrusion coating system includes an A-side coating mechanism, a B-side coating mechanism, an extrusion oven assembly, and an oven output conversion mechanism. The extrusion oven assembly is composed of a plurality of extrusion ovens connected together, each of which includes a plurality of folded baking layers. The baking layer into which the lithium battery foil enters after coating is the first baking layer, and a plurality of air nozzles are provided on the upper and lower sides of the first baking layer; except for the first Except for one drying layer, the other drying layers are all provided with multiple air nozzles on one side, and the positions of the air nozzles are arranged opposite to those of the adjacent drying layers; the first drying layer outlet is provided with a first oven outlet conversion mechanism, and the first oven outlet conversion mechanism includes an adsorption roller and multiple correcting rollers; except for the first drying layer, the other drying layer outlets are provided with a second oven outlet mechanism, and the second oven outlet mechanism includes an air flotation roller and multiple correcting rollers. Arc rollers are also provided in the first oven outlet conversion mechanism and the second oven outlet conversion mechanism, and the roller surface of the arc roller is slightly convex, and the diameter in the middle is slightly larger than that at both ends.

[0008] Furthermore, the gravure double-sided coating system includes a gravure double-sided coater, a gravure oven and a gravure detection mechanism, and the gravure detection mechanism includes a gravure deviation corrector and a gravure thickness gauge.

[0009] Furthermore, the extrusion coating system includes an A-side coating mechanism, a B-side coating mechanism, an extrusion oven, an oven outlet conversion mechanism, and a traction mechanism.

[0010] Furthermore, the A-side coating mechanism includes a pre-coating correcting device, an A-side coater and a wet film thickness gauge, and the B-side coating mechanism includes a pre-coating correcting device, a B-side coater and a wet film thickness gauge.

[0011] Furthermore, the extrusion oven is provided with a plurality of baking layers, the baking layers are provided with at least one baking hull, an air duct is provided inside the baking hull, one end of the baking hull is a fixed end, and the other end is an air outlet end, the fixed end is used to be fixed in the baking layer, a plurality of air nozzles are evenly provided on the air outlet end, and a movable baffle is provided in the middle of the air nozzle; the air nozzle includes a mesh air nozzle, an outer eight air nozzle and an inner eight air nozzle; each of the baking layers is divided into several sections, the first two sections adopt the mesh air nozzle, and the remaining sections adopt outer eight air nozzles or inner eight air nozzles.

[0012] Furthermore, the extrusion oven includes the first baking layer, the second baking layer and the third baking layer, one oven hull is fixed at the top and bottom of each of the first baking layer, the upper side wind nozzles of the top oven hull blow air downward, and the lower side wind nozzles of the bottom oven hull blow air upward, and the upper side wind nozzles and the lower side wind nozzles are staggered in an upward and downward manner; one oven hull is fixed at the bottom of the second baking layer, and the lower side wind nozzles of the bottom oven hull blow air upward; one oven hull is fixed at the top of the third baking layer, and the upper side wind nozzles of the top oven hull blow air downward.

[0013] Furthermore, the extrusion oven assembly of the extrusion coating system includes an A-side oven assembly and a B-side oven assembly; each extrusion oven assembly is composed of several extrusion ovens connected in series, and the extrusion oven includes a first baking layer, a second baking layer, and a third baking layer, and the first oven outlet conversion mechanism is provided between the first baking layer and the second baking layer; the second oven outlet conversion mechanism is provided between the second baking layer and the third baking layer.

[0014] Furthermore, the traction mechanism includes a two-layer traction mechanism and a one-layer traction mechanism. A two-layer traction mechanism is provided between the A-side oven assembly and the B-side coating mechanism, and a one-layer traction mechanism is provided between the B-side oven assembly and the winding system. The two-layer traction mechanism includes two layers of discharge correction devices, a traction machine and a laser beam all-in-one machine arranged in sequence; the one-layer traction mechanism includes a one-layer discharge correction mechanism, a one-layer traction machine and a laser beam all-in-one machine arranged in sequence.

[0015] Furthermore, it also includes a control system, which is used to receive signals transmitted by other systems and send instruction signals to other systems after discrimination and analysis.

[0016] Furthermore, a roller encoder is connected to the roller shaft of the adsorption roller to read the roller shaft speed ω of the adsorption roller. An ultrasonic speed sensor is provided on the left and right sides of the bottom of the first oven conversion mechanism to measure the left linear speed V of the lithium battery foil at the output end of the adsorption roller. L and the right linear velocity V R The roller encoder and ultrasonic speed sensor are both electrically connected to the control system, and the control system reads the roller speed ω and the left linear speed V respectively within the set interval time s. L and the right linear velocity V R , perform deviation correction and slip judgment, and the control system dynamically adjusts the parallelism, pressing force, feeding speed and tension of the adsorption roller according to the judgment results.

[0017] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The extrusion oven's three-layer folding design significantly increases the drying path length within a limited space, improving coating speed. The extrusion oven also implements layered temperature control: the first layer performs double-sided drying and pre-curing at 100-120°C, the second layer performs single-sided intensive drying at 90-110°C, and the third layer performs low-temperature shaping at 80-100°C, preventing thermal stress cracking. The nozzle configuration within the extrusion oven is optimized: the first two sections use mesh nozzles for preheating, while the remaining eight nozzles, both outer and inner, provide forced convection and uniform shaping, shortening drying time. The first layer's double-sided staggered nozzles create convection, reducing single-sided warping and addressing the problem of wrinkling and cracking in the coating.

[0019] 2. After passing through the first drying layer, the lithium battery foil enters the first oven conversion mechanism. The first oven conversion mechanism uses an adsorption roller to contact the drying surface, and the second oven conversion mechanism uses an air flotation roller to suspend the undried surface. This combination design makes up for the mechanical support of the roller and avoids the risk of coating damage caused by wet film sticking to the roller.

[0020] 3. The integrated design of gravure coating and extrusion coating, and the folding design of the extrusion oven both reduce the equipment footprint.

[0021] 4. A roller encoder is connected to the roller shaft of the adsorption roller, and an ultrasonic speed sensor is installed on the left and right sides of the bottom of the first oven conversion mechanism. By comparing the speed data on both sides of the lithium battery foil at the output end of the adsorption roller in real time, it is quickly determined whether the lithium battery foil has deviated, and the correction mechanism is triggered in time to ensure that the lithium battery foil is always stably transmitted along the predetermined path. At the same time, through real-time comparison with the theoretical speed of the adsorption roller, the slip phenomenon is accurately detected, and the pressing force and feeding speed are automatically adjusted to effectively avoid problems such as tensile deformation of the lithium battery foil or decreased transmission efficiency due to insufficient friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a lithium battery gravure extrusion high-speed coating machine;

[0023] Figure 2 This is a schematic diagram of the first oven conversion mechanism structure of the lithium battery gravure extrusion high-speed coating machine;

[0024] Figure 3 This is a schematic diagram of the second oven conversion mechanism type I structure of the lithium battery gravure extrusion high-speed coating machine;

[0025] Figure 4 This is a schematic diagram of the second oven conversion mechanism type II of the lithium battery gravure extrusion high-speed coating machine;

[0026] Figure 5 This is a schematic diagram of the extrusion oven structure of the lithium battery gravure extrusion high-speed coating integrated machine;

[0027] Figure 6 This is a schematic diagram of the unwinding system, gravure double-sided coater, and gravure oven structure of a lithium battery gravure extrusion high-speed coating machine.

[0028] Figure 7 This is a schematic diagram of the gravure detection mechanism structure of the lithium battery gravure extrusion high-speed coating integrated machine;

[0029] Figure 8 This is a schematic diagram of the A-side coating mechanism and A-side climbing mechanism of the lithium battery gravure extrusion high-speed coating integrated machine;

[0030] Figure 9 This is a schematic diagram of the second-layer traction mechanism structure of the lithium battery gravure extrusion high-speed coating machine;

[0031] Figure 10 This is a schematic diagram of the winding system structure of the lithium battery gravure extrusion high-speed coating integrated machine;

[0032] Figure 11 This is a three-dimensional schematic diagram of the nozzle structure of the lithium battery gravure extrusion high-speed coating machine;

[0033] In the figure, 1-lithium battery foil, 1000-unwinding system, 2000-gravure double-sided coating system, 2010-gravure double-sided coating machine, 2020-gravure oven, 2030-gravure detection mechanism, 2031-gravure deviation correction machine, 2032-gravure thickness gauge, 3000-extrusion coating system, 3010-A side coating mechanism, 3011-pre-coating deviation correction device, 3012-A side coating machine, 3013-wet film thickness gauge, 3020-A side climbing mechanism, 3030-extrusion oven assembly, 30300-extrusion oven, 30301-first drying layer, 30302-second drying layer, 30303-third drying layer, 30304-oven hull, 30305-nozzle, 30306-movable baffle, 3031-A side oven assembly, 3032-B side oven assembly, 3040-first oven outlet conversion mechanism, 3041-adsorption roller, 3050-second oven outlet conversion mechanism, 3051-second oven outlet conversion mechanism type I, 3052-second oven outlet conversion mechanism type II, 30511-air flotation roller, 3060-second layer traction mechanism, 3061-second layer discharge correction device, 3062-traction machine, 3063-laser beam integrated machine, 3070-B side coating mechanism, 3071-B side coating machine, 3080-B side climbing mechanism, 3090-first layer traction mechanism, 3091-first layer discharge correction device, 4000-winding system, 4010-winding correction device, 4020-winding device. DETAILED DESCRIPTION

[0034] The following is a detailed description of 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 used to illustrate and explain the present invention and cannot be used to limit the present invention.

[0035] 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 may also have other implementations and variations thereof. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] like Figure 1-5 As shown, a lithium battery gravure extrusion high-speed coating integrated machine includes a lithium battery foil 1, which is coated in sequence through an unwinding system 1000, a gravure double-sided coating system 2000, an extrusion coating system 3000 and a winding system 4000. The extrusion coating system 3000 includes an A-side coating mechanism 3010, a B-side coating mechanism 3070, an extrusion oven assembly 3030 and an oven output conversion mechanism. The extrusion oven assembly 3030 is composed of multiple extrusion ovens 30300 connected in series, each extrusion oven 30300 includes a plurality of extrusion ovens 30300 connected in series. The present invention comprises multiple baking layers arranged in a folded manner, and the baking layer into which the lithium battery foil 1 enters after coating is the first baking layer 30301. The first baking layer 30301 is provided with multiple air nozzles 30305 on the upper and lower sides; except for the first baking layer 30301, the remaining baking layers are provided with multiple air nozzles 30305 on one side, and the positions of the air nozzles 30305 of adjacent baking layers are arranged in opposite directions: that is, the second baking layer 30302 is provided with multiple air nozzles 30305 on the lower side, the third baking layer 30303 is provided with multiple air nozzles 30305 on the upper side, and so on. The outlet of the first drying layer 30301 is provided with a first oven exit conversion mechanism 3040, which includes an adsorption roller 3041 and multiple correcting rollers; except for the first drying layer 30301, the outlets of the remaining drying layers are provided with a second oven exit mechanism, which includes an air flotation roller 30511 and multiple correcting rollers; the first oven exit conversion mechanism 3040 and the second oven exit conversion mechanism 3050 are also provided with arc rollers, and the roller surface of the arc roller is slightly convex, and the diameter of the middle part is slightly larger than that of the two ends, forming a controllable radial tension gradient. When the lithium battery foil 1 passes through the arc roller, the middle path is slightly longer than the two sides, forcing the lithium battery foil 1 to stretch laterally, eliminating wrinkles caused by uneven stress. At the same time, the centrifugal effect generated by the curved surface can offset the stress in the lithium battery foil 1, further preventing the lithium battery foil 1 from wrinkling and cracking.

[0037] like Figure 6 As shown, the gravure double-sided coating system 2000 includes a gravure double-sided coater 2010 , a gravure oven 2020 and a gravure detection mechanism 2030 ; wherein the gravure detection mechanism 2030 includes a gravure deviation correcting machine 2031 and a gravure thickness gauge 2032 .

[0038] like Figure 1-9 As shown, the extrusion coating system 3000 includes an A-side coating mechanism 3010, a B-side coating mechanism 3070, an extrusion oven 30300, an oven out conversion mechanism and a traction mechanism.

[0039] like Figure 8 As shown, the A-side coating mechanism 3010 includes a pre-coating correcting device 3011, an A-side coater 3012 and a wet film thickness gauge 3013; the B-side coating mechanism 3070 includes a pre-coating correcting device 3011, a B-side coater 3071 and a wet film thickness gauge 3013.

[0040] like Figure 5 As shown, the extrusion oven 30300 is provided with a plurality of baking layers, and at least one baking oven hull 30304 is provided in the baking layer. An air duct is provided inside the baking oven hull 30304, and one end of the baking oven hull 30304 is a fixed end and the other end is an air outlet end. The fixed end is used to be fixed in the baking layer, and a plurality of air nozzles 30305 are evenly provided on the air outlet end.

[0041] like Figure 11 As shown, a movable baffle 30306 is provided in the middle of the air nozzle 30305. The movable baffle 30306 balances the temperature difference between the coating area on the lithium battery foil 1, i.e., high heat absorption area, and the empty foil area, i.e., low heat absorption area, by adjusting the air flow direction and air volume distribution, thereby avoiding local overheating or insufficient heating and reducing warping and cracking on both sides of the lithium battery foil 1. The air nozzle 30305 includes a mesh air nozzle, an outer eight air nozzle and an inner eight air nozzle.

[0042] As a preferred embodiment of the present invention, the movable baffle 30306 can move laterally at the air outlet of the air nozzle 30305, change the air volume ratio on both sides according to process requirements, and optimize the heat field distribution in real time. For example, when the coating area requires more heat, the movable baffle 30306 can be biased toward the empty foil side to reduce the air volume in this area; if the overall heating is uneven, the airflow on both sides can be balanced by symmetrically adjusting the movable baffle 30306; the movable baffle 30306 is an airflow and temperature equalization device in the drying process, and by dynamically adjusting its position, quality defects caused by uneven heating can be reduced.

[0043] As a preferred embodiment of the present invention, each of the baking layers is divided into several sections, the first two sections are preheated by the mesh-type air nozzle, and the remaining sections are dried by the upper inner eight air nozzles and the lower outer eight air nozzles, or the upper outer eight air nozzles and the lower inner eight air nozzles, or both the upper and lower sides are outer eight air nozzles, or both the upper and lower sides are inner eight air nozzles according to process requirements.

[0044] like Figure 5As shown, the extrusion oven 30300 is folded into three layers, including the first drying layer 30301, the second drying layer 30302 and the third drying layer 30303. The first drying layer 30301 is fixed with an oven hull 30304 on the top and the bottom respectively. The upper air nozzle 30305 of the oven hull 30304 on the top blows air downward, and the lower air nozzle 30305 of the oven hull 30304 on the bottom blows air upward. The upper air nozzle 30305 and the lower air nozzle 30305 are arranged in an up-down staggered manner, using a 100-12 0℃ double-sided blowing and drying; an oven hull 30304 is fixed on the bottom of the second baking layer 30302, and the lower side wind nozzle 30305 of the oven hull 30304 at the bottom blows air upwards, and 90-110℃ lower side single-sided blowing and drying is adopted; an oven hull 30304 is fixed on the top of the third baking layer 30303, and the upper side wind nozzle 30305 of the oven hull 30304 at the top blows air downwards, and 80-100℃ upper side single-sided blowing and drying is adopted, which increases the drying length in a limited space and can improve the coating speed.

[0045] In actual implementation, the folding design of the oven baking layer, the optimized design of the oven nozzle 30305, and the temperature control solved the problem that the coating speed was limited by the oven, and the extrusion coating oven drying was prone to wrinkling and cracking.

[0046] like Figure 1 As shown, the extrusion oven 30300 component 3030 of the extrusion coating system 3000 includes an A-side oven component 3031 and a B-side oven component 3032; each extrusion oven component 3030 is composed of a plurality of extrusion ovens 30300 connected in series, and the extrusion oven 30300 includes a first drying layer 30301, a second drying layer 30302, and a third drying layer 30303, and a first oven outlet conversion mechanism 3040 is provided between the first drying layer 30301 and the second drying layer 30302; a second oven outlet conversion mechanism 3050 is provided between the second drying layer 30302 and the third drying layer 30303.

[0047] like Figure 1 and Figure 9 As shown, the traction machine 3062 includes a two-layer traction mechanism 3060 and a one-layer traction mechanism 3090. A two-layer traction mechanism 3060 is provided between the A-side oven assembly 3031 and the B-side coating mechanism 3070, and a one-layer traction mechanism 3090 is provided between the B-side oven assembly 3032 and the winding system 4000. The two-layer traction mechanism 3060 includes a two-layer discharging correction device 3061, a traction machine 3062 and a laser beam integrated machine 3063 arranged in sequence; the one-layer traction mechanism 3090 includes a one-layer discharging correction mechanism 3091, a one-layer traction machine 3062 and a laser beam integrated machine 3063 arranged in sequence.

[0048] like Figure 10 As shown, the winding system 4000 includes a winding correction device 4010 and a winding device 4020.

[0049] like Figure 1 and Figure 8 As shown, it also includes a climbing system, which includes an A-side climbing mechanism 3020 and a B-side climbing mechanism 3080. The A-side climbing mechanism 3020 is arranged between the A-side coating mechanism 3010 and the A-side oven assembly 3031; the B-side climbing mechanism 3080 is arranged between the B-side coating mechanism 3070 and the B-side oven assembly 3032.

[0050] like Figure 2 As shown, in the first oven-out conversion mechanism 3040, two correcting rollers, one adsorption roller 3041 and one correcting roller are sequentially arranged. Compared with the oven-out conversion mechanism in the prior art, multiple rollers are reduced. Since the lithium battery foil 1 passes through the drying of the first drying layer 30301, its A side or B side is not completely dry. Therefore, after the lithium battery foil 1 enters the first oven-out conversion mechanism 3040, the side of the coating that is not completely dry does not contact the correcting roller and the adsorption roller 3041. Therefore, the slurry on the lithium battery foil 1 will not adhere to the roller, resulting in uneven coating. At the same time, since the first drying layer 303 01 Use 100-120℃ double-sided staggered air nozzles 30305 to make hot air blow the foil from different angles, forming a convection effect, and reducing warping deformation caused by single-sided heating; a variety of air nozzles 30305 are combined for blowing and drying to ensure that the hot air evenly covers the full width of the lithium battery foil 1 to avoid local drying that is too fast or too slow; two of the correcting rollers are set in sequence for pre-correction to preliminarily correct the lateral offset of the lithium battery foil 1; the adsorption roller 3041 adsorbs the lithium battery foil 1 through negative pressure to make it close to the roller surface and eliminate local wrinkles; the last correcting roller of this mechanism accurately fine-tunes the lithium battery foil 1 to ensure that the foil is completely centered before entering the next baking layer.

[0051] like Figure 3-4 As shown, the second oven exit conversion mechanism 3050 is sequentially provided with a plurality of the aforementioned correction rollers and a plurality of the aforementioned adsorption rollers 3041. Compared to conventional oven exit conversion mechanisms, the second oven exit conversion mechanism 3050 reduces the number of rollers. The second oven exit conversion mechanism 3050 forms an air cushion using the high-pressure air flow nozzles on the roller surface or on both sides of the air floatation roller 30511, thereby suspending and transporting the lithium battery foil 1 in a non-contact state. The buoyancy of the air flow evenly distributes the tension and reduces the risk of deformation.

[0052] like Figure 3-4As shown, the second oven exit conversion mechanism 3050 includes a second oven exit conversion mechanism type I 3051 and a second oven exit conversion mechanism type II 3052. The difference between the two is that different numbers of the air flotation rollers 30511 and the deviation correction rollers are arranged according to the installation position.

[0053] As a preferred embodiment of the present invention, the outlet of the first drying layer 30301 in the same oven uses a suction roller 3041, and the outlets of the drying layers other than the first drying layer 30301 use an air flotation roller 30511. This combination of use achieves high-quality transportation of the lithium battery foil 1.

[0054] Although the oven exit conversion mechanism of the present invention reduces the number of rollers compared to the oven exit conversion mechanism of the prior art, through the combined use of the first oven exit conversion mechanism 3040 adsorption roller 3041 and the second oven exit conversion mechanism 3050 adsorption roller 3041 flotation roller 30511, the lithium battery foil 1 can still be transported smoothly even if the rollers are removed, and the problem of slurry adhering to the rollers, resulting in uneven coating, is also solved.

[0055] Since the first oven-out conversion mechanism in the prior art uses a roller, the roller has two-side contact with the lithium battery foil 1, that is, the lithium battery foil 1 is controlled by double-sided friction; after the present invention changes the roller to an adsorption roller 3041, the adsorption roller 3041 has one-side contact with the lithium battery foil 1, that is, the lithium battery foil 1 is controlled by single-sided friction. When the speeds on both sides of the lithium battery foil 1 are different, deviation problems will occur. When the speeds on both sides of the lithium battery foil 1 are the same but different from the rotation speed of the adsorption roller 3041, slippage problems will occur. Therefore, it is necessary to monitor the speeds of both sides of the lithium battery foil 1 in real time.

[0056] The lithium battery gravure extrusion high-speed coating integrated machine of the present invention further includes a control system (not shown in the figure), which is used to receive signals transmitted by other systems and send command signals to other systems after discrimination and analysis.

[0057] As a preferred embodiment of the present invention, a roller encoder (not shown in the figure) is connected to the roller shaft of the adsorption roller 3041 for reading the roller shaft speed ω of the adsorption roller. An ultrasonic speed sensor (not shown in the figure) is provided on each side of the bottom of the first oven conversion mechanism 3040 for measuring the left linear velocity V of the lithium battery foil 1 at the output end of the adsorption roller 3041. L and the right linear velocity V R The roller encoder and ultrasonic speed sensor are both electrically connected to the control system, and the control system reads the roller speed ω and the left linear speed V respectively within the set interval time s. L and the right linear velocity V R , perform deviation correction and slip determination:

[0058] 1. Calculate the linear velocity of the adsorption roller V0 = ω·r

[0059] Where: V0 is the linear velocity, unit is m / s; ω is the roller speed, unit is rad / s; r is the radius of the adsorption roller, unit is m;

[0060] 2. Correction judgment

[0061] If V L ≠V R , indicating that the lithium battery foil 1 has a lateral offset; the lateral offset Δ is determined by the left and right speed difference of the lithium battery foil 1: Δ=|V L -V R ∣; Monitor the speed V of lithium battery foil 1 L and V R Even if there is no offset, the actual measured value may have a slight difference due to sensor error or slight vibration, so the threshold Δ′=η·V0 is set;

[0062] Where: Δ′ is the correction threshold, unit is m / s; η is the proportional coefficient, unit is %. In actual implementation, η is set to 0.5~2%;

[0063] When Δ>Δ′, it is determined to be V L ≠V R If correction is required, adjust the axis parallelism or tension distribution of the adsorption roller 3041 until the left and right forces are balanced; if deviation occurs frequently, calibrate the roller installation angle or check the tension uniformity of the lithium battery foil 1.

[0064] When Δ≤Δ′, it is determined to be V L =V R , then no correction is required and the next step of slip determination is continued;

[0065] 3. Slippage determination

[0066] If V L =V R ≠V0, indicating that there is overall slippage between the adsorption roller and the foil, and the slip coefficient ξ needs to be calculated:

[0067]

[0068] Where: V 平 V L and V R The average value of ξ is in m / s; ξ is the slip coefficient in %.

[0069] Set ξ′ as the slip threshold, in %, and in actual implementation, ξ′ is set to 1-3%;

[0070] When ξ>ξ′, it is judged as slipping, then the pressing force of the adsorption roller 3041 is increased and the feeding speed is reduced until ξ≤ξ; if slipping occurs frequently, check whether the surface of the adsorption roller 3041 is worn.

[0071] If V L =V R =V0, it is determined that there is no slip and no adjustment is required.

[0072] This monitoring method quickly determines whether the lithium battery foil 1 has deviated by comparing the speed data on both sides of the lithium battery foil 1 at the output end of the adsorption roller 3041 in real time, and promptly triggers the correction mechanism to ensure that the lithium battery foil 1 is always stably transmitted along the predetermined path. At the same time, through real-time comparison with the theoretical speed of the adsorption roller 3041, it accurately detects slippage and automatically adjusts the pressing force and feeding speed, effectively avoiding problems such as tensile deformation of the lithium battery foil 1 or reduced transmission efficiency due to insufficient friction.

[0073] The process flow of the lithium battery gravure extrusion high-speed coating integrated machine of the present invention is as follows:

[0074] Step 1: Unwinding: The lithium battery foil 1 is unwound from the unwinding system 1000, and the tension is dynamically adjusted by the tension roller and the dancer roller to ensure that the foil is flat before entering the subsequent process.

[0075] Step 2: Gravure double-sided coating: The lithium battery foil 1 enters the gravure double-sided coating machine 2010 for simultaneous gravure coating of the A and B sides. After coating is completed, it enters the gravure correction machine 2031 to correct the lateral deviation of the lithium battery foil 1 to avoid misalignment in double-sided coating before entering the next step.

[0076] Step 3: Gravure double-sided coating and drying: The lithium battery foil 1 enters the gravure oven 2020, where both sides are dried simultaneously. Then, it enters the gravure thickness gauge 2032, where the dry film thickness is measured using a laser. The next step is then entered. The gravure thickness gauge 2032 is used to provide feedback to adjust the gravure roller pressure or slurry viscosity of the gravure double-sided coater 2010.

[0077] Step 4: Extrusion coating of side A: The lithium battery foil 1 enters the pre-coating correction device 3011 for correction to ensure the accurate starting position of the extrusion coating of side A. The foil then enters the side A coater 3012. The coater die extrudes the active material slurry onto side A of the lithium battery foil 1, covering it with a gravure coating. The foil then enters the wet film thickness gauge 3013 to measure the wet film thickness. Based on the test results, the die gap or feed pressure is adjusted in real time. The lithium battery foil 1 then enters the drying oven at a designed angle through the side A climbing mechanism 3020.

[0078] Step 5: Extrusion and drying of side A: The lithium battery foil 1 enters the first drying layer 30301 of side A for double-sided drying. It then passes through the first oven exit conversion mechanism 3040 and enters the second drying layer 30302 of side A for bottom-side drying. It then passes through the second oven exit conversion mechanism 3050 and enters the third drying layer 30303 of side A for top-side drying at low temperature to eliminate thermal stress. The lithium battery foil 1 enters the second-layer discharge correction device 3061 to ensure that the foil is centered after side A is dried. It then enters the traction machine 3062 to maintain constant tension. Finally, it enters the laser beam integrated machine 3063 to scan the surface density and defects of the dried coating on side A. If it is qualified, it proceeds to the next step.

[0079] Step 6: Extrusion coating of side B: The lithium battery foil 1 enters the pre-coating correction device 3011 for correction to ensure the accurate starting position of the extrusion coating of side B. Then it enters the side B coater 3071. The coater die extrudes the active material slurry onto the side B of the lithium battery foil 1, covering it with a gravure coating. The foil then enters the wet film thickness gauge 3013 to measure the wet film thickness. Based on the test results, the die gap or feed pressure is adjusted in real time. The lithium battery foil 1 then enters the drying oven at a designed angle through the side B climbing mechanism 3080 to reduce sudden changes in tension.

[0080] Step 7: Extrusion and drying of side B: The lithium battery foil 1 enters the first drying layer 30301 of side B for double-sided drying. It then passes through the first oven exit conversion mechanism 3040 and enters the second drying layer 30302 of side B for bottom-side drying. It then passes through the second oven exit conversion mechanism 3050 and enters the third drying layer 30303 of side B for top-side drying at low temperature to eliminate thermal stress. The lithium battery foil 1 enters the second-layer discharge correction device 3061 to ensure that the foil is centered after side B is dried. It then enters the traction machine 3062 to maintain constant tension. Finally, it enters the laser beam integrated machine 3063 to scan the surface density and defects of the dried coating on side B. If it is qualified, it proceeds to the next step.

[0081] Step 8: Rewinding: The lithium battery foil 1 enters the rewinding and correcting device 4010 to dynamically adjust the rewinding alignment accuracy, and then is received into the rewinding device 4020 .

[0082] It should be understood that the above embodiments are one or more embodiments of the present invention, and there are many other embodiments and variations thereof based on the present invention; the variations and modifications made by ordinary technicians in this industry through the present invention without making groundbreaking innovations all fall within the scope of protection of the present invention.

Claims

1. A lithium battery gravure extrusion high-speed coating integrated machine, characterized in that: The invention comprises a lithium battery foil, which is coated in sequence through an unwinding system, a gravure double-sided coating system, an extrusion coating system and a winding system. The extrusion coating system comprises an A-side coating mechanism, a B-side coating mechanism, an extrusion oven assembly and an oven outlet conversion mechanism. The extrusion oven assembly is composed of a plurality of extrusion ovens connected together, each of which comprises a plurality of folded drying layers. The drying layer into which the lithium battery foil enters after coating is the first drying layer, and a plurality of air nozzles are provided on the upper and lower sides of the first drying layer. Except for the first drying layer, the remaining drying layers are provided with a plurality of air nozzles. Each layer is provided with multiple air nozzles on one side, and the positions of the air nozzles are arranged opposite to those of adjacent drying layers; the first drying layer outlet is provided with a first oven outlet conversion mechanism, and the first oven outlet conversion mechanism includes an adsorption roller and multiple correcting rollers; except for the first drying layer, the remaining drying layer outlets are provided with a second oven outlet mechanism, and the second oven outlet mechanism includes an air flotation roller and multiple correcting rollers. Arc rollers are also provided in the first oven outlet conversion mechanism and the second oven outlet conversion mechanism, and the roller surface of the arc roller is slightly convex, and the diameter of the middle part is slightly larger than that of the two ends.

2. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 1, characterized in that: The gravure double-sided coating system comprises a gravure double-sided coating machine, a gravure oven and a gravure detection mechanism, and the gravure detection mechanism comprises a gravure deviation correcting machine and a gravure thickness gauge.

3. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 1, characterized in that: The extrusion coating system comprises an A-side coating mechanism, a B-side coating mechanism, an extrusion oven, an oven-out conversion mechanism and a traction mechanism.

4. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 3, characterized in that: The A-side coating mechanism includes a pre-coating correcting device, an A-side coater and a wet film thickness gauge, and the B-side coating mechanism includes a pre-coating correcting device, a B-side coater and a wet film thickness gauge.

5. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 1, characterized in that: The extrusion oven is provided with multiple baking layers, and at least one baking hull is provided in the baking layer. An air duct is provided inside the baking hull. One end of the baking hull is a fixed end, and the other end is an air outlet end. The fixed end is used to be fixed in the baking layer. Multiple air nozzles are evenly provided on the air outlet end, and a movable baffle is provided in the middle of the air nozzle; the air nozzles include mesh air nozzles, outer eight air nozzles and inner eight air nozzles; each baking layer is divided into several sections, the first two sections adopt the mesh air nozzles, and the remaining sections adopt outer eight air nozzles or inner eight air nozzles.

6. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 5, characterized in that: The extrusion oven includes the first baking layer, the second baking layer and the third baking layer, wherein an oven hull is fixed on the top and bottom of each of the first baking layer, the upper side air nozzles of the top oven hull blow air downward, and the lower side air nozzles of the bottom oven hull blow air upward, and the upper side air nozzles and the lower side air nozzles are arranged in an upper and lower staggered manner; an oven hull is fixed on the bottom of the second baking layer, and the lower side air nozzles of the bottom oven hull blow air upward; an oven hull is fixed on the top of the third baking layer, and the upper side air nozzles of the top oven hull blow air downward.

7. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 6, characterized in that: The extrusion oven assembly of the extrusion coating system includes an A-side oven assembly and a B-side oven assembly; each extrusion oven assembly is composed of several extrusion ovens connected in series, and the extrusion oven includes a first baking layer, a second baking layer, and a third baking layer. The first oven outlet conversion mechanism is provided between the first baking layer and the second baking layer; the second oven outlet conversion mechanism is provided between the second baking layer and the third baking layer.

8. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 7, characterized in that: The traction mechanism includes a two-layer traction mechanism and a one-layer traction mechanism. A two-layer traction mechanism is provided between the A-side oven assembly and the B-side coating mechanism, and a one-layer traction mechanism is provided between the B-side oven assembly and the winding system. The two-layer traction mechanism includes two layers of discharging correction devices, a traction machine and a laser beam integrated machine arranged in sequence; the one-layer traction mechanism includes a one-layer discharging correction mechanism, a one-layer traction machine and a laser beam integrated machine arranged in sequence.

9. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 1, characterized in that: It also includes a control system, which is used to receive signals transmitted by other systems and send instruction signals to other systems after discrimination and analysis.

10. The lithium battery gravure extrusion high-speed coating integrated machine according to claim 9, characterized in that: The roller shaft of the adsorption roller is connected to a roller shaft encoder for reading the roller shaft speed ω of the adsorption roller. An ultrasonic speed sensor is provided on each of the left and right sides of the bottom of the first oven conversion mechanism for measuring the left linear speed V of the lithium battery foil at the output end of the adsorption roller. L and the right linear velocity V R The roller encoder and ultrasonic speed sensor are both electrically connected to the control system, and the control system reads the roller speed ω and the left linear speed V respectively within the set interval time s. L and the right linear velocity V R , perform deviation correction and slip judgment, and the control system dynamically adjusts the parallelism, pressing force, feeding speed and tension of the adsorption roller according to the judgment results.

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