Lithium battery intaglio extrusion high-speed coating integrated machine

Abstract

The application provides a lithium battery gravure extrusion high-speed coating integrated machine, and belongs to the technical field of lithium battery manufacturing. The lithium battery foil material sequentially passes through a unwinding system, a gravure double-sided coating system, an extrusion coating system and a winding system to complete coating. Through the design of folding three layers in the extrusion oven, the drying path length is significantly increased in the limited space, and the coating speed is improved. The first drying layer double-sided offset air nozzle forms convection + outer eight / inner eight air nozzle cooperation, reduces single-sided heating warping, and solves the problems that the coating is prone to wrinkling and cracking. After the lithium battery foil material passes through the first drying layer, the lithium battery foil material enters a first drying oven conversion mechanism. The first drying oven conversion mechanism adopts an adsorption roller to contact a drying surface. The second drying oven conversion mechanism adopts an air floatation roller to suspend a wet surface. Such a combined design compensates for the mechanical support of the passing roller and avoids the risk of coating damage caused by the wet film sticking to the passing roller.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery manufacturing, in particular to a high-speed coating integrated machine for lithium battery gravure extrusion. BACKGROUND

[0002] The coating of lithium battery foil is one of the core processes of battery manufacturing, and its purpose is to uniformly coat the active material slurry on the metal foil to form a coating with consistent thickness and no defects. Traditional coating techniques include gravure coating and extrusion coating. Gravure coating transfers the slurry through a gravure roller engraved with micron-sized cells, which is suitable for thin-layer and high-precision coating. Extrusion coating extrudes the slurry through a slit die, which is suitable for high-viscosity slurry and thick coating. The high-speed coating integrated machine for lithium battery gravure extrusion combines the 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 the gravure coating and extrusion coating equipment. The high-speed coating integrated machine for lithium battery gravure extrusion can achieve low COV value, ensure the uniformity of the coating surface density, and improve product quality. However, the existing high-speed coating integrated machine for lithium battery gravure extrusion still has the following problems:

[0003] 1. Since the gravure coating layer is thin and dries quickly, the coating speed is about 100 m / min. However, the extrusion coating layer is thick, and the single extrusion coating machine has a coating speed of about 80 m / min. When integrated into a gravure extrusion integrated machine, if the overall coating speed is 100 m / min, the coating layer is prone to wrinkling and cracking after drying in the extrusion coating oven.

[0004] 2. The existing oven exit conversion mechanism is provided with multiple over rollers. The over rollers contact the two surfaces of the lithium battery foil, apply a certain pressure and support to the lithium battery foil, eliminate the deformation of the lithium battery foil due to the non-uniformity of the coating layer or thermal stress, and ensure that the lithium battery foil remains flat during transmission. However, during extrusion coating, the single-sided oven cannot completely dry the slurry on the lithium battery foil coating. When the over rollers contact the two surfaces of the lithium battery foil, the slurry on the lithium battery foil is easily attached to the over rollers of the oven exit conversion mechanism, resulting in uneven coating and affecting the quality of the coating layer. SUMMARY

[0005] The present application relates to the technical field of lithium battery manufacturing, in particular to a high-speed coating integrated machine for lithium battery gravure extrusion.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] The utility model provides a kind of lithium battery gravure extrusion high-speed coating integrated machine, including lithium electric foil, the lithium electric foil is sequentially coated by unwinding system, gravure double-sided coating system, extrusion coating system and winding system, the extrusion coating system includes A surface coating mechanism, B surface coating mechanism, extrusion oven assembly and out oven conversion mechanism, the extrusion oven assembly is connected by multiple extrusion ovens, each extrusion oven includes multiple baking layers of folding arrangement, the baking layer that the lithium electric foil enters after coating is first baking layer, the upper side and lower side of the first baking layer are equipped with multiple air nozzles;Except the first baking layer, the rest baking layer is single side and is equipped with multiple air nozzles, and the air nozzle position of adjacent baking layer is reversely arranged;The first baking layer outlet is provided with first out oven conversion mechanism, and the first out oven conversion mechanism includes adsorption roller and multiple correction rollers;Except the first baking layer, the rest baking layer outlet is provided with second out oven mechanism, and the second out oven mechanism includes air floatation roller and multiple correction rollers, and first out oven conversion mechanism and the second out oven conversion mechanism are also equipped with arc-shaped roller, and the roller surface of the arc-shaped roller is slightly convex arc-shaped, and the middle part diameter is slightly larger than both ends.

[0008] Further, the gravure double-sided coating system includes a gravure double-sided coating machine, a gravure oven, and a gravure detection mechanism, the gravure detection mechanism includes a gravure correction machine and a gravure thickness gauge.

[0009] Further, the extrusion coating system includes an A surface coating mechanism, a B surface coating mechanism, an extrusion oven, an out oven conversion mechanism, and a traction mechanism.

[0010] Further, the A surface coating mechanism includes a pre-coating correction device, an A surface coating machine, and a wet film thickness gauge, and the B surface coating mechanism includes a pre-coating correction device, a B surface coating machine, and a wet film thickness gauge.

[0011] Further, the extrusion oven is provided with multiple baking layers, and at least one oven hull is arranged in each baking layer, the oven hull is internally provided with an air duct, one end of the oven 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 uniformly arranged on the air outlet end, and a movable baffle is arranged in the middle of the air nozzle; The air nozzle includes a mesh type air nozzle, an outer eight air nozzle, and an inner eight air nozzle; Each baking layer is divided into several sections, the first two sections use the mesh type air nozzle, and the rest sections use the outer eight air nozzle or the inner eight air nozzle.

[0012] Further, the extrusion oven comprises the first baking layer, the second baking layer and the third baking layer, the first baking layer is fixed with one oven body at the top and the bottom, the upper side air nozzle of the oven body at the top blows air downward, the lower side air nozzle of the oven body at the bottom blows air upward, and the upper side air nozzle and the lower side air nozzle are arranged in a staggered manner; the second baking layer is fixed with one oven body at the bottom, the lower side air nozzle of the oven body at the bottom blows air upward; the third baking layer is fixed with one oven body at the top, the upper side air nozzle of the oven body at the top blows air downward.

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

[0014] Further, the traction mechanism comprises a two-layer traction mechanism and a one-layer traction mechanism, the two-layer traction mechanism is arranged between the A-side oven assembly and the B-side coating mechanism, the one-layer traction mechanism is arranged between the B-side oven assembly and the winding system, the two-layer traction mechanism comprises a two-layer material outlet deviation rectifying device, a traction machine and a laser ray integrated machine arranged in sequence; the one-layer traction mechanism comprises a one-layer material outlet deviation rectifying device, a one-layer traction machine and a laser ray integrated machine arranged in sequence.

[0015] Further, a control system is further included, which is used for receiving signals transmitted by other systems, sending command signals to other systems after judgment and analysis.

[0016] Further, a roller shaft encoder is connected to the roller shaft of the suction roller, which is used for reading the rotation speed ω of the roller shaft of the suction roller, and an ultrasonic speed sensor is arranged at the left side and the right side of the bottom of the first oven outlet conversion mechanism, which is used for measuring the left side linear speed V L and the right side linear speed V R of the lithium battery foil on the output end of the suction roller, the roller shaft encoder and the ultrasonic speed sensor are electrically connected with the control system, the control system reads the rotation speed ω, the left side linear speed V L and the right side linear speed V R at a set interval time s respectively, and judges deviation and slip, and the control system dynamically adjusts the parallelism, the pressing force, the feeding speed and the tension of the lithium battery foil of the suction roller according to the judgment result.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] 1. By folding three layers of the extrusion oven baking layer, the design significantly increases the drying path length in limited space, improves the coating speed; and the extrusion oven is controlled by layered temperature: the first baking layer 100-120℃ double-sided drying pre-curing, the second baking layer 90-110℃ single-sided strengthening drying, the third baking layer 80-100℃ low temperature setting to avoid thermal stress cracking; the air nozzle optimization combination is carried out in the extrusion oven: the first two sections of the mesh type air nozzle preheating, the remaining sections of the outer eight air nozzles and the inner eight air nozzles forced convection, uniform setting, shorten the drying time. The first baking layer double-sided staggered air nozzle forms convection, reduces single-sided heating warping, solves the problem of wrinkling and cracking of the coating.

[0019] 2. After the lithium battery foil passes through the first baking layer, it enters the first oven exit conversion mechanism, the first oven exit conversion mechanism adopts adsorption roller contact drying surface, and the second oven exit conversion mechanism adopts air floating roller suspension wet surface. Such combination design makes up for the mechanical support of the roller, and can avoid the risk of coating damage caused by wet film sticking to the roller.

[0020] 3. The design of gravure coating and extrusion coating integration, the folding design of extrusion oven reduces the equipment floor area.

[0021] 4. The roller shaft encoder is connected to the adsorption roller shaft, and an ultrasonic speed sensor is arranged on the left and right sides of the bottom of the first oven exit conversion mechanism. By comparing the speed data of the two sides of the lithium battery foil output end of the adsorption roller in real time, it is quickly judged whether the lithium battery foil deviates, and the deviation correction mechanism is triggered in time to ensure that the lithium battery foil always transmits along the predetermined path stably. At the same time, by comparing with the theoretical speed of the adsorption roller in real time, the slip phenomenon is accurately detected, and the pressure and feeding speed are automatically adjusted to effectively avoid the problems of lithium battery foil stretching deformation or transmission efficiency reduction caused by insufficient friction. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

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

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

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

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

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

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

[0032] Figure 11 It is a structure schematic diagram of air nozzle for the high-speed coating integrated machine of lithium battery gravure extrusion;

[0033] In the figure, 1-lithium 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 oven layer, 30302-second oven layer, 30303-third oven layer, 30304-oven hull, 30305-air nozzle, 30306-movable baffle, 3031-A-side oven assembly, 3032-B-side oven assembly, 3040-first oven exit conversion mechanism, 3041-adsorption roller, 3050-second oven exit conversion mechanism, 3051-type I second oven exit conversion mechanism, 3052-type II second oven exit conversion mechanism, 30511-air float roller, 3060-two-layer traction mechanism, 3061-two-layer exit deviation correction device, 3062-traction machine, 3063-laser ray integrated machine, 3070-B-side coating mechanism, 3071-B-side coating machine, 3080-B-side climbing mechanism, 3090-one-layer traction mechanism, 3091-one-layer exit deviation correction device, 4000-winding system, 4010-winding deviation correction device, 4020-winding device. DETAILED DESCRIPTION

[0034] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments given here are only for the purpose of illustration and explanation of the present application, and cannot be used to limit the scope of the present application.

[0035] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also have other embodiments and variations, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0036] As shown in Figures 1-5 A high-speed coating integrated machine for lithium battery gravure extrusion is shown in the drawings, which comprises a lithium battery foil 1, the lithium battery foil 1 is coated by a unwinding system 1000, a gravure double-sided coating system 2000, an extrusion coating system 3000 and a winding system 4000 in turn, the extrusion coating system 3000 comprises an A-side coating mechanism 3010, a B-side coating mechanism 3070, an extrusion oven assembly 3030 and an oven exit conversion mechanism, the extrusion oven assembly 3030 is composed of a plurality of extrusion ovens 30300 connected in series, each extrusion oven 30300 comprises a plurality of baking layers arranged in a folding manner, the baking layer that the lithium battery foil 1 enters after coating is a first baking layer 30301, the upper side and the lower side of the first baking layer 30301 are provided with a plurality of air nozzles 30305; except the first baking layer 30301, the rest of the baking layers are provided with a plurality of 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 a plurality of air nozzles 30305 on the lower side, the third baking layer 30303 is provided with a plurality of air nozzles 30305 on the upper side, and so on. The first baking layer 30301 is provided with a first oven exit conversion mechanism 3040 at the outlet, the first oven exit conversion mechanism 3040 comprises a suction roller 3041 and a plurality of correction rollers; except the first baking layer 30301, the outlets of the rest of the baking layers are provided with a second oven exit mechanism, the second oven exit mechanism comprises an air floatation roller 30511 and a plurality of correction rollers; the first oven exit conversion mechanism 3040 and the second oven exit conversion mechanism 3050 are further provided with an arc-shaped roller, the roller surface of the arc-shaped roller is in a slightly convex arc shape, the middle part has a diameter slightly larger than both ends, forming a controllable radial tension gradient, when the lithium battery foil 1 passes through the arc-shaped roller, the middle part has a slightly longer path than both sides, forcing the lithium battery foil 1 to stretch horizontally, eliminating wrinkles caused by uneven stress, and the centrifugal effect generated by the curved surface can offset the internal stress of the lithium battery foil 1, further preventing the lithium battery foil 1 from wrinkling and cracking.

[0037] As shown in Figure 6 The gravure double-sided coating system 2000 comprises a gravure double-sided coating machine 2010, a gravure oven 2020 and a gravure detection mechanism 2030; wherein the gravure detection mechanism 2030 comprises a gravure correction machine 2031 and a gravure thickness gauge 2032.

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

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

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

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

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

[0043] As a preferred embodiment of the present application, each baking layer 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 nozzle, the lower outer eight air nozzle, or the upper outer eight air nozzle, the lower inner eight air nozzle, or the upper and lower sides are both outer eight air nozzles, or the upper and lower sides are both inner eight air nozzles.

[0044] As shown in Figure 5As shown, the extrusion oven 30300 folds three layers, including the first baking layer 30301, the second baking layer 30302 and the third baking layer 30303, the first baking layer 30301 is fixed with one oven hull 30304 at the top and the bottom, the upper side air nozzle 30305 of the oven hull 30304 at the top blows air downward, the lower side air nozzle 30305 of the oven hull 30304 at the bottom blows air upward, and the upper side air nozzle 30305 and the lower side air nozzle 30305 are arranged in an up-down staggered manner, and 100-120℃ double-sided air blowing drying is adopted; the second baking layer 30302 is fixed with one oven hull 30304 at the bottom, the lower side air nozzle 30305 of the oven hull 30304 at the bottom blows air upward, and 90-110℃ lower side single-sided air blowing drying is adopted; the third baking layer 30303 is fixed with one oven hull 30304 at the top, the upper side air nozzle 30305 of the oven hull 30304 at the top blows air downward, and 80-100℃ upper side single-sided air blowing 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 optimization of the oven air nozzle 30305 design and the temperature control solve the problem that the coating speed is limited by the oven, and the problem of wrinkling and cracking easily occurs in the drying of the extrusion coating oven.

[0046] As shown in Figure 1 , 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 series-connected extrusion ovens 30300, the extrusion oven 30300 includes a first baking layer 30301, a second baking layer 30302 and a third baking layer 30303, and the first baking layer 30301 and the second baking layer 30302 are provided with the first oven outlet conversion mechanism 3040; the second baking layer 30302 and the third baking layer 30303 are provided with the second oven outlet conversion mechanism 3050.

[0047] As shown in Figure 1 and Figure 9 , the traction machine 3062 includes a two-layer traction mechanism 3060 and a one-layer traction mechanism 3090, the A-side oven component 3031 and the B-side coating mechanism 3070 are provided with the two-layer traction mechanism 3060, and the B-side oven component 3032 and the winding system 4000 are provided with the one-layer traction mechanism 3090, the two-layer traction mechanism 3060 includes a two-layer material outlet deviation device 3061, a traction machine 3062 and a laser ray integrated machine 3063 arranged in sequence; the one-layer traction mechanism 3090 includes a one-layer material outlet deviation mechanism 3091, a one-layer traction machine 3062 and a laser ray integrated machine 3063 arranged in sequence.

[0048] As shown in Figure 10 The winding system 4000 includes a winding deviation correction device 4010 and a winding device 4020.

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

[0050] As shown in Figure 2 In the first oven exit conversion mechanism 3040, two deviation correction rollers, one suction roller 3041 and one deviation correction roller are arranged in sequence. Compared with the prior art oven exit conversion mechanism, the number of over rollers is reduced. Since the lithium battery foil 1 is dried by the first drying layer 30301, the A surface or the B surface is not completely dry. Therefore, when the lithium battery foil 1 enters the first oven exit conversion mechanism 3040, the un-dried coating surface does not contact the deviation correction roller and the suction roller 3041, so that the paste on the lithium battery foil 1 does not adhere to the over roller, causing uneven coating. At the same time, since the first drying layer 30301 uses 100-120°C double-sided up-down staggered air nozzles 30305 to blow hot air from different angles to the foil, a convection effect is formed, reducing the warping deformation caused by single-sided heating. A variety of air nozzles 30305 are combined to blow and dry, ensuring that the hot air uniformly covers the full width of the lithium battery foil 1, avoiding local drying too fast or too slow. Two deviation correction rollers are arranged in sequence for pre-deviation correction, which preliminarily corrects the transverse deviation of the lithium battery foil 1. The suction roller 3041 adsorbs the lithium battery foil 1 by negative pressure, making it adhere to the roller surface and eliminating local wrinkles. The last deviation correction roller of the mechanism finely adjusts the lithium battery foil 1, ensuring that the foil is completely centered before entering the next drying layer.

[0051] As shown in Figures 3-4 In the second oven exit conversion mechanism 3050, a plurality of deviation correction rollers and a plurality of suction rollers 3041 are arranged in sequence. Compared with the prior art oven exit conversion mechanism, the use of over rollers is reduced. The second oven exit conversion mechanism 3050 forms an air cushion through the air floating roller 30511 roller surface or the high-pressure air jet nozzle on both sides, so that the lithium battery foil 1 is suspended and transmitted in a non-contact state, relying on the air flow buoyancy to evenly distribute the tension and reduce the risk of deformation.

[0052] As shown in Figures 3-4As shown, the second out-of-oven conversion mechanism 3050 includes a second out-of-oven conversion mechanism type I 3051 and a second out-of-oven conversion mechanism type II 3052, which differ in that different numbers of the air float roller 30511 and the deviation correction roller are arranged according to the installation position.

[0053] As a preferred embodiment of the present application, the first baking layer 30301 outlet in the same oven is provided with the adsorption roller 3041, and the baking layer outlet other than the first baking layer 30301 is provided with the air float roller 30511. Such a combined use mode realizes high-quality transmission of the lithium battery foil 1.

[0054] The out-of-oven conversion mechanism of the present application, although reducing the over roller compared with the prior art out-of-oven conversion mechanism, through the combined use of the adsorption roller 3041 of the first out-of-oven conversion mechanism 3040 and the air float roller 30511 of the second out-of-oven conversion mechanism 3050, even if the over roller is removed, the lithium battery foil 1 can still be transmitted flat, and the problem of uneven coating caused by the attachment of sizing material on the over roller is also solved.

[0055] Since the prior art first out-of-oven conversion mechanism uses an over roller, the over roller has two surface contacts with the lithium battery foil 1, that is, the lithium battery foil 1 is controlled by double-sided friction; after the over roller is changed to the adsorption roller 3041 of the present application, the adsorption roller 3041 has one surface contact with the lithium battery foil 1, that is, the lithium battery foil 1 is controlled by single-sided friction, and when the speeds of the two sides of the lithium battery foil 1 are different, the problem of deviation will occur, and when the speeds of the two sides of the lithium battery foil 1 are the same but the rotation speed of the adsorption roller 3041 is different, the problem of slipping will occur, therefore, the speeds of the two sides of the lithium battery foil 1 need to be monitored in real time.

[0056] The high-speed coating all-in-one machine for the intaglio extrusion of the lithium battery of the present application further includes a control system (not shown in the figure), which is used to receive the signals transmitted by other systems, and sends command signals to other systems after discriminant analysis.

[0057] As a preferred embodiment of the present application, a roller shaft encoder (not shown in the figure) is connected to the roller shaft of the adsorption roller 3041, which is used to read the rotation speed ω of the adsorption roller shaft, and an ultrasonic speed sensor (not shown in the figure) is arranged on the left and right sides of the bottom of the first out-of-oven conversion mechanism 3040, which is used to measure the left side linear speed V L and the right side linear speed V R of the lithium battery foil 1 on the output end of the adsorption roller 3041, the roller shaft encoder and the ultrasonic speed sensor are electrically connected with the control system, and the control system reads the roller shaft rotation speed ω, the left side linear speed V L and the right side linear speed V R at a set interval time s, respectively, and makes deviation correction and slipping determination:

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

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

[0060] 2. Deviation correction determination

[0061] If V L ≠ V R , it means that the lithium battery foil 1 has a lateral deviation; the lateral deviation Δ is determined by the left and right speed difference of the lithium battery foil 1: Δ = |V L -V R |; When monitoring the left and right speed V L and V R of the lithium battery foil 1, even if there is no deviation, the actual measured value may have a small difference due to sensor error or slight vibration, so a threshold Δ' = η·V0 is set;

[0062] Wherein: Δ' is the deviation correction threshold, unit m / s; η is the proportional coefficient, unit %; In actual implementation, η takes 0.5-2%;

[0063] When Δ> Δ', it is determined that V L ≠ V R needs to be corrected, then adjust the parallelism of the axis of the adsorption roller 3041 or the tension distribution until the left and right forces are balanced; If the deviation is frequent, the roller shaft installation angle needs to be calibrated or the lithium battery foil 1 tension uniformity needs to be checked.

[0064] When Δ≤ Δ', it is determined that V L = V R , then no correction is needed, and the next step of slip determination is continued;

[0065] 3. Slip determination

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

[0067]

[0068] Wherein: V 平 is the average value of V L and V R , unit m / s; ξ is the slip coefficient, unit %;

[0069] Set ξ' as the slip threshold, unit %, in actual implementation, ξ' takes 1-3%;

[0070] When ξ>ξ', it is determined that the slip occurs, the adsorption roller 3041 pressure is increased, and the feeding speed is reduced until ξ≤ξ'; if the slip occurs frequently, the surface of the adsorption roller 3041 is checked for wear.

[0071] If V L =V R =V0, it is determined that no slip occurs, and adjustment is not needed.

[0072] The monitoring mode compares the speed data of the lithium battery foil 1 on both sides of the output end of the adsorption roller 3041 in real time, quickly judges whether the lithium battery foil 1 deviates, and timely triggers the deviation correction mechanism, so that the lithium battery foil 1 is always stably transmitted along the predetermined path, meanwhile, through real-time comparison with the theoretical speed of the adsorption roller 3041, the slip phenomenon is accurately detected, and the pressure and the feeding speed are automatically adjusted, so that the problems such as stretching deformation of the lithium battery foil 1 or reduction of transmission efficiency caused by insufficient friction are effectively avoided.

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

[0074] Step one, unwinding: the lithium battery foil 1 is unwound from the unwinding system 1000, the tension of the foil is dynamically adjusted through the tension roller and the float roller, and the foil is ensured to be flat and enter the subsequent process;

[0075] Step two, double-sided coating by gravure: the lithium battery foil 1 enters the double-sided coating machine by gravure 2010, and the A surface and the B surface are synchronously coated by gravure, and after the coating is completed, the lithium battery foil 1 is corrected by the gravure deviation correction machine 2031 to avoid the deviation after the double-sided coating, and then enters the next step;

[0076] Step three, double-sided coating by gravure and drying: the lithium battery foil 1 enters the gravure oven 2020, and after the double-sided drying, the lithium battery foil 1 enters the gravure thickness gauge 2032, the dry film thickness is detected by laser, and then enters the next step, the gravure thickness gauge 2032 is used to feedback and adjust the gravure roller pressure or the slurry viscosity of the double-sided coating machine by gravure 2010;

[0077] Step four, A surface extrusion coating: the lithium battery foil 1 enters the deviation correction device 3011 before coating to correct the deviation, so that the starting position of the A surface extrusion coating is accurate; then the lithium battery foil 1 enters the A surface coating machine 3012, the active material slurry is extruded and coated on the A surface of the lithium battery foil 1 by the coating machine die, the coating layer is covered, and then the wet film thickness gauge 3013 is used to detect the wet film thickness, the die gap or the feeding pressure is adjusted in real time according to the detection result; the lithium battery foil 1 enters the oven through the A surface climbing mechanism 3020 at a designed angle.

[0078] Step five, A-side extrusion drying: the lithium battery foil 1 enters the first drying layer 30301 of the A-side, is dried by double-sided blowing, enters the second drying layer 30302 of the A-side through the first drying oven conversion mechanism 3040, is dried by bottom blowing, enters the third drying layer 30303 of the A-side through the second drying oven conversion mechanism 3050, is shaped by top blowing at low temperature, and thermal stress is eliminated; the lithium battery foil 1 enters the two-layer discharge deviation correcting device 3061, ensures that the foil is centered after A-side drying, enters the traction machine 3062 to maintain constant tension, and finally enters the laser-ray integrated machine 3063 to scan the surface density and defects of the coating after B-side drying, and enters the next step after being determined to be qualified;

[0079] Step six, B-side extrusion coating: the lithium battery foil 1 enters the pre-coating deviation correcting device 3011 to be corrected, to ensure that the starting position of B-side extrusion coating is accurate; then enters the B-side coating machine 3071, the active material slurry is extruded and coated on the B-side of the lithium battery foil 1 by the coating machine die, to cover the gravure coating, then enters the wet film thickness gauge 3013 to detect the wet film thickness, and according to the detection result, the die gap or the feeding pressure is adjusted in real time; the lithium battery foil 1 enters the oven through the B-side climbing mechanism 3080 at a designed angle, to reduce the tension mutation;

[0080] Step seven, B-side extrusion drying: the lithium battery foil 1 enters the first drying layer 30301 of the B-side, is dried by double-sided blowing, enters the second drying layer 30302 of the B-side through the first drying oven conversion mechanism 3040, is dried by bottom blowing, enters the third drying layer 30303 of the B-side through the second drying oven conversion mechanism 3050, is shaped by top blowing at low temperature, and thermal stress is eliminated; the lithium battery foil 1 enters the two-layer discharge deviation correcting device 3061, ensures that the foil is centered after B-side drying, enters the traction machine 3062 to maintain constant tension, and finally enters the laser-ray integrated machine 3063 to scan the surface density and defects of the coating after B-side drying, and enters the next step after being determined to be qualified;

[0081] Step eight, winding: the lithium battery foil 1 enters the winding deviation correcting device 4010 to dynamically adjust the winding alignment accuracy, and then enters the winding device 4020.

[0082] It should be understood that the above embodiments are one or more embodiments of the present application, and there are many other embodiments and variations based on the present application; the variations and modifications made by the ordinary skilled in the art based on the present application without making pioneering innovations all belong to the protection scope of the present application.

Claims

1. A high-speed integrated machine for gravure extrusion and coating of lithium batteries, characterized in that: The lithium battery foil is coated by a unwinding system, a gravure double-sided coating system, an extrusion coating system and a winding system in sequence, the extrusion coating system comprises an A-side coating mechanism, a B-side coating mechanism, an extrusion oven assembly, an oven exit conversion mechanism and a traction mechanism; the extrusion oven assembly comprises an A-side oven assembly and a B-side oven assembly, and both the A-side oven assembly and the B-side oven assembly are composed of a plurality of series-connected extrusion ovens, the extrusion oven comprises a first baking layer, a second baking layer and a third baking layer, at least one oven hull is arranged in the baking layer, an air duct is arranged in the oven hull, one end of the oven hull is a fixed end, and the other end is an air outlet end, the fixed end is arranged in the baking layer, a plurality of air nozzles are uniformly arranged on the air outlet end, and a movable baffle is arranged in the air nozzle; each baking layer is divided into a plurality of sections, the first two sections adopt mesh type air nozzles, and the remaining sections adopt outer eight air nozzles or inner eight air nozzles; one oven hull is fixed at the top and the bottom of the first baking layer respectively, the upper air nozzles of the oven hull at the top blow air downward, the lower air nozzles of the oven hull at the bottom blow air upward, and the upper air nozzles and the lower air nozzles are arranged in a staggered manner; one oven hull is fixed at the bottom of the second baking layer, and the lower air nozzles of the oven hull at the bottom blow air upward; one oven hull is fixed at the top of the third baking layer, and the upper air nozzles of the oven hull at the top blow air downward; a first oven exit conversion mechanism is arranged between the first baking layer and the second baking layer, the first oven exit conversion mechanism comprises a suction roller and a plurality of correction rollers; a second oven exit conversion mechanism is arranged between the second baking layer and the third baking layer, the second oven exit conversion mechanism comprises an air floatation roller and a plurality of correction rollers; an arc-shaped roller is further arranged in the first oven exit conversion mechanism and the second oven exit conversion mechanism, the roller surface of the arc-shaped roller is in a slightly convex arc shape, and the middle part has a diameter slightly larger than both ends.

2. The integrated machine for high-speed coating of a lithium battery gravure extrusion 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 correction machine and a gravure thickness gauge. 3.The integrated machine for lithium battery gravure extrusion high-speed coating according to claim 1, wherein: The A-side coating mechanism comprises a pre-coating correction device, an A-side coating machine and a wet film thickness gauge, and the B-side coating mechanism comprises a pre-coating correction device, a B-side coating machine and a wet film thickness gauge.

4. The integrated machine for high-speed coating of a lithium battery gravure extrusion according to claim 1, characterized in that: The traction mechanism comprises a two-layer traction mechanism and a one-layer traction mechanism, the two-layer traction mechanism is arranged between the A-side oven assembly and the B-side coating mechanism, and the one-layer traction mechanism is arranged between the B-side oven assembly and the winding system, the two-layer traction mechanism comprises a two-layer discharge correction device, a traction machine and a laser ray integrated machine arranged in sequence, and the one-layer traction mechanism comprises a one-layer discharge correction mechanism, a one-layer traction machine and a laser ray integrated machine arranged in sequence.

5. The integrated machine for high-speed coating of a lithium battery gravure extrusion according to claim 1, characterized in that: A control system is further arranged, which is used for receiving signals transmitted by other systems, sending command signals to other systems after judgment and analysis. 6.The integrated machine for lithium battery gravure extrusion high-speed coating according to claim 5, characterized in that: The roll shaft of the adsorption roller is connected with a roll shaft encoder for reading the rotation speed ω of the roll shaft of the adsorption roller, and each of the left and right sides of the bottom of the first out-of-oven conversion mechanism is provided with an ultrasonic speed sensor for measuring the left linear speed VL and the right linear speed VR of the lithium battery foil on the output end of the adsorption roller, and the roll shaft encoder and the ultrasonic speed sensor are electrically connected with a control system, the control system reads the rotation speed ω, the left linear speed VL and the right linear speed VR at a set interval time s respectively, carries out deviation correction and slip determination, and the control system dynamically adjusts the parallelism, the pressing force, the feeding speed and the tension of the lithium battery foil of the adsorption roller according to the determination result.

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