CN107457141B - Device for coating graphene on surface of metal foil - Google Patents
Device for coating graphene on surface of metal foil Download PDFInfo
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- CN107457141B CN107457141B CN201710841165.5A CN201710841165A CN107457141B CN 107457141 B CN107457141 B CN 107457141B CN 201710841165 A CN201710841165 A CN 201710841165A CN 107457141 B CN107457141 B CN 107457141B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
- B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
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Abstract
The invention discloses a device for coating graphene on the surface of a metal foil, which comprises a control unit, and an unreeling unit, a coating and printing device, a baking unit and a reeling unit which are sequentially arranged along the movement direction of the metal foil, wherein the metal foil is an aluminum foil or a copper foil; the coating and printing device comprises a press roller, a driving silica gel roller and a driving steel roller which are arranged from top to bottom in a laminated mode, wherein the driving silica gel roller and the driving steel roller rotate in opposite directions and keep a micron-sized gap; the driving steel roller is immersed in a colloid pool containing viscous materials, and the base material is arranged between the press roller and the driving silica gel roller. According to the invention, uniform spraying of materials with submicron-order thickness and thinner layers on the surface of the base material is realized, the thickness requirement of graphene coated on the metal foil is met, the graphene-coated metal foil has good adhesive force, and the contact resistance between carbon particles and the metal foil is effectively reduced.
Description
Technical Field
The invention belongs to the technical field of power batteries/super capacitors, and particularly relates to a device for coating graphene on metal foil.
Background
In the power battery and the super capacitor, a pole piece of an electrode is a key component, and a coating machine is generally required to uniformly coat functional materials such as carbon particles, carbon nanofibers, graphene and the like on the surface of a metal foil (copper foil or aluminum foil). The principle of a common coating machine is similar to that of a gravure printing machine, a coiled substrate is conveyed to a coating and printing area through a transmission mechanism, a functional material is coated on a designated position on the surface of the substrate, and then the functional material is dried, rolled and the like for manufacturing subsequent products. Wherein the thickness, uniformity, adhesion, width, positional accuracy and coating rate of the coated media are all metrics.
The Chinese patent 'lithium battery pole piece coating machine (201320299315.1)' discloses a lithium battery pole piece coating machine, the machine consists of a pole piece unreeling device, a tension adjusting device, a slurry coating device, a drying device and a reeling device, the problems that the coating of the graphene material on the metal foil cannot be realized by adopting the conventional coating machine scheme, this is because industrial graphene has good conductive properties only under the condition of a very thin layer, and the thinner the thickness, the closer to single-layer graphene, the better the conductivity, so the graphene carbon-coated metal foil requires to coat very thin and uniform graphene material on the metal foil, and the graphene and the base material have strong adhesive capacity, but the existing coating method for graphene, namely screen line roller coating (micro gravure and gravure coating), is difficult to meet the coating requirement, and the electrical property of the pole piece cannot be ensured.
Disclosure of Invention
The invention provides a device for coating graphene on a metal foil substrate, which adopts a three-roller rotating structure, adopts a pair of driving rotating rollers with opposite rotating directions and a certain rotating speed difference to extrude, stretch and extend a graphene viscous material, and transfers the graphene viscous material to the surface of the metal foil by virtue of a press roller, thereby realizing the coating of the graphene on the surface of the metal foil in the continuous operation process of the substrate, wherein the adhesive layer is thin and uniform, has strong adhesive force, meets the manufacturing requirements of a power battery and a super capacitor, and simultaneously, a substrate surface treatment link is arranged before the coating, thereby improving the adhesive force between a functional material and the metal foil, and reducing the contact resistance.
The technical scheme of the invention is as follows
A device for coating graphene on the surface of a metal foil comprises a control unit, and an unreeling unit, a coating and printing device, a baking unit and a reeling unit which are sequentially arranged along the movement direction of the metal foil, wherein the metal foil is an aluminum foil or a copper foil;
the coating and printing device comprises a press roller, a driving silica gel roller and a driving steel roller which are arranged from top to bottom in a laminated mode, wherein the driving silica gel roller and the driving steel roller rotate in opposite directions and keep a micron-sized gap; the driving steel roller is immersed in a colloid pool containing viscous materials, the base material is arranged between the pressing roller and the driving silica gel roller, the base material is supported on the supporting roller and moves along the direction of the centrifugal force of the upper vertex of the driving silica gel roller under the traction of power, and the pressing roller presses the base material on the upper surface of the driving silica gel roller under the drive of the lifting unit; the driving steel roller adheres the viscous material to the surface of the roller body, a colloid film adhered to the surface of the driving silica gel roller is formed after extrusion and extension of a gap between the driving silica gel roller and the driving steel roller, and the colloid film is transferred to the surface of the base material through the compression roller.
In the device for coating graphene on the surface of the metal foil, the linear speed ratio of the rotating speed of the driving silica gel roller to the rotating speed of the driving steel roller is 1.1-1.5 times, and the gap between the driving silica gel roller and the driving steel roller can be adjusted.
In the device for coating the graphene on the surface of the metal foil, the baking unit comprises a plurality of baking channels, so that the metal foil can be heated and cooled from 40-120-200-100-normal temperature in a segmented manner, the driving rollers are arranged in the baking channels at intervals, the metal foil is supported on the driving rollers, and the driving rollers drive the metal foil to feed under the driving of the power transmission device outside the baking channels.
In the device for coating the graphene on the surface of the metal foil, the device for coating the graphene on the surface of the metal foil further comprises a high-voltage discharge processing device arranged between the unreeling unit and the coating device, the high-voltage discharge processing device comprises a plurality of high-voltage discharge processing units arranged on the surface of the metal foil to be processed, and each high-voltage discharge processing unit comprises a high-voltage box body, a negative-pressure air draft device, a high-voltage source and a plurality of strip-shaped discharge electrodes; the metal foil is wound on the high-voltage discharge roller, and the discharge electrode is arranged at the front end of the opening of the high-voltage box body and is arranged on the circumference of the high-voltage discharge roller in parallel along the axial direction of the high-voltage discharge roller; the discharge electrode and the metal foil keep a gap, and the discharge electrode generates electric arc action to the metal foil, so that pits and salient points are generated on the surface of the metal foil; the rear end of the high-pressure box body is provided with a negative pressure air outlet which is communicated with an external negative pressure air draft device.
In the device for coating graphene on the surface of the metal foil, the gap between the discharge electrode and the metal foil is 2-4 mm.
In the device for coating the graphene on the surface of the metal foil, the device for coating the graphene on the surface of the metal foil further comprises an extrusion glue homogenizing device which is arranged in the coating and printing device in the subsequent process; the extrusion glue homogenizing device comprises a power transmission unit, a pressure adjusting unit and an extrusion glue homogenizing roller, the extrusion glue homogenizing roller is arranged on the swing arm and is pressed against the surface of the base material coated with the material under the action of the pressure adjusting unit, and the extrusion glue homogenizing roller rotates along the reverse direction of the movement direction of the base material under the driving of the power transmission unit.
In the device for coating graphene on the surface of the metal foil, the swing arm comprises a fixed end and a swing end, the fixed end is movably connected to the rack through a rotating shaft, the extrusion glue homogenizing roller is arranged at the swing end of the swing arm, and the pressure adjusting unit changes the swing angle of the swing arm, so that the extrusion glue homogenizing roller is pressed and attached to the surface of the base material coated with the material.
In the device for coating graphene on the surface of the metal foil, the power transmission unit comprises a first belt wheel, a second belt wheel, a third belt wheel and a glue homogenizing motor, the first belt wheel is arranged at the swinging end of the swinging arm, the second belt wheel is arranged at the fixed end of the swinging arm, the first belt wheel is coaxially connected with the extruding glue homogenizing roller, the third belt wheel and the glue homogenizing motor are arranged on the rack, the glue homogenizing motor drives the third belt wheel to rotate, the second belt wheel is driven to rotate through a belt, and the first belt wheel and the extruding glue homogenizing roller are driven to synchronously rotate.
In the device for coating the graphene on the surface of the metal foil, the device for coating the graphene on the surface of the metal foil further comprises a plurality of tension control devices arranged in a coating link, and each tension control unit comprises a driving roller, a swing roller, a large gear, a small gear, a potentiometer, a swing rod, an air cylinder and a control center; the swing rod is arranged along the vertical direction, the swing roller is arranged at the lower end of the swing rod, and the upper end of the swing rod is fixedly connected with the large gear and swings along the axis of the large gear; a piston rod of the air cylinder is fixed in the middle of the swing rod through a movable hinge and stretches along with the swing of the swing rod; the small gear is arranged on a shaft head of a rotating shaft of the potentiometer and is meshed with the large gear; the base material is arranged on the driving roller and the swing roller, the driving roller is provided with a power driving device, and the control center is electrically connected with the power driving device and the potentiometer.
In the device for coating the graphene on the surface of the metal foil, the cylinder is communicated with the gas storage tank, the control center is electrically connected with the pressure regulating valve of the gas storage tank, and the control center regulates the parameter of the pressure regulating valve to realize the regulation of the output pressure of the gas storage tank.
The invention has the following beneficial technical effects:
according to the invention, under the extrusion, stretching and extension effects of graphene viscous materials under two rotating rollers with different rotating speeds and opposite rotating directions, a glue layer with a certain thickness is formed on the surface of a rubber roller, and then the materials are transferred to the surface of a continuous material feeding substrate by virtue of a pressing roller, so that a thin and uniform coating is formed, uniform spraying of materials with submicron-level thickness and thinner layers on the surface of the substrate is realized, the thickness requirement of graphene on the metal foil is met, and the graphene adhesive force is good, so that the contact resistance between carbon particles and the metal foil is effectively reduced, the overall performance of the battery is greatly improved, namely, the polarization of the battery is inhibited, the heat effect is reduced, and the rate capability is improved.
And the rotating speed difference between the active silica gel roller and the active steel roller and the gap between the active silica gel roller and the active steel roller are adjustable, so that the requirements of different viscous materials and the thickness of the coated graphene are met. Meanwhile, the supporting roller, the driving silica gel roller and the driving steel roller are of a hollow shaft structure, a heating unit is installed inside the hollow shaft, the heating unit can adopt an electric heating rod and can also adopt flowing medium heat conduction oil, PID automatic temperature control is adopted, meanwhile, a heating device is also arranged at the bottom of the colloid pool, the temperature of the driving roller is set according to the characteristic parameters and the process of the material in the coating process, the deformation caused by temperature difference is reduced, the quality of the product is ensured, and meanwhile, the temperature, the density and the viscosity of the material are kept consistent, so that the coated film is uniform and consistent.
Thirdly, before the graphene is coated on the metal foil, the invention carries out real-time online surface high-pressure discharge etching and roughening treatment on the substrate, adopts a plurality of high-voltage power supplies loaded on a high-pressure discharge roller to carry out high-density large-area high-power multiple discharge treatment on the front surface and the back surface of the substrate, and forms pits which are equivalent to the size of the coated graphene particles and are uniformly distributed on the front surface and the back surface of the metal foil, so that the carbon-coated aluminum foil or copper foil (the anode and cathode materials of the lithium iron phosphate battery, the anode and cathode materials of the lithium manganate battery, the electrode coating of the super capacitor, the electrode coating of the ternary material battery) produced by the coating machine can provide excellent static conductive performance, collect micro-current of active materials, greatly reduce the contact resistance between the anode and cathode materials and current collection, and improve the adhesive capacity between the anode and cathode materials (the adhesive capacity is, the usage amount of the adhesive can be reduced, so that the overall performance of the battery is greatly improved, namely, the polarization of the battery is inhibited, the heat effect is reduced, and the rate performance is improved; the internal resistance of the battery is reduced, the dynamic internal resistance amplification of the battery core in the circulation process is obviously reduced, the consistency is improved, and the circulation life of the battery is greatly prolonged; the adhesive force of the active material and the current collector is improved, and the manufacturing cost of the pole piece is reduced; protecting the current collector from being corroded by the electrolyte; the processing performance of the lithium iron phosphate material is improved.
And fourthly, material deviation rectifying devices are arranged in the three working materials of the unreeling station, the reeling station and the intermediate coating station, so that the materials are prevented from deviating, and meanwhile, a full-automatic tension control system is arranged, so that stable tension control is realized. The tension of the metal foil is ensured to be constant and the deformation of the metal foil is consistent in the coating process, and the thickness uniformity and the spraying quality of the coating medium layer are ensured.
And fifthly, the equipment is provided with a plurality of groups of closed-loop tension control devices, so that the tension of the metal foil is kept constant and the transverse position of the metal foil is stable in the whole coating process, the uniformity and consistency of the graphene in the coating process and the winding process are ensured, and the consistency and stability of the conductive characteristics of the prepared carbon-coated metal foil are finally ensured. The tension control device adopts a swing rod and gear angle amplification structure, can measure and amplify tension change of the metal foil in production and feed back the tension change to the driving roller, and realizes stable closed-loop tension control; meanwhile, the required tension can be adjusted by adjusting the pressure of the control cylinder, so that the requirements of different occasions are met.
And sixthly, an extrusion glue homogenizing device is added behind the coating station, and a pressure-adjustable glue homogenizing roller is adopted to extrude and smooth glue homogenizing in the opposite direction after coating, so that the contact area between graphene material particles and a substrate is further increased, the adhesive force is increased, and the conductive characteristic of the finished carbon-coated metal foil is improved.
Drawings
FIG. 1 is a schematic diagram illustrating the principle of the graphene coating apparatus on a metal foil according to the present invention;
FIG. 2 is a schematic diagram of a high voltage discharge processing unit according to the present invention;
FIG. 3 is a schematic view of a high voltage discharge processing apparatus according to the present invention;
FIG. 4 is a schematic view of the tension control device of the present invention;
FIG. 5 is a schematic view of the engagement of the large pinion with the small pinion in the tension control device of the present invention;
FIG. 6 is a schematic view of the moment balance principle in the tension control device of the present invention;
FIG. 7 is a schematic diagram of a coating and printing apparatus according to the present invention;
FIG. 8 is a schematic diagram of a coating and printing apparatus for coating processes according to the present invention;
FIG. 9 is a schematic view of a coating and printing apparatus according to the present invention;
FIG. 10 is a schematic view of an extrusion coating apparatus according to the present invention.
In the figure: 1, an unwinding unit; 2-a tension sensor; 3-high voltage discharge treatment device; 4-a first deviation correcting device; 5-a metal foil; 6, rolling; 7-first tension control means; 8-coating and printing device; 12-drying channel; 16-a second deviation correcting device; 17-a second tension control device; 23-a driving roller; 28-a third deviation correcting device; 29-high voltage discharge processing unit; 31-a colloid pool; 32-driving steel roller; 33-thin film glue film; 34-active silica gel roller; 35-a press roll; 303-heating rod; 304-a rack; 306-shaft end; 308-shaft end support; 315-pulley; 316-drive belt; 350-supporting rollers; 351-strip-shaped pressing plates; 352-hinge axis; 353, a compression roller cylinder; 354-rubber roller cylinder; 355-a stopper; 356-frame plate; 357 — adjusting screws; 359-sliders; 41-a winding unit; 43-extruding and glue homogenizing device; 701-driving roll; 702 — a drive motor; 703-pinion gear; 704-bull gear; 705-cylinder; 706-a piston rod; 707-swing rod; 708-swing rollers; 709-a potentiometer; 710 — control hub; 711-gas storage tank; 712-potentiometer shaft; 715-upper rotating rollers; 716 — a lower rotating roller; 81-air outlet; 82-a high-pressure tank body; 83-discharge electrode; 84-gas flow; 85-high voltage discharging roller; 86-electric arc; 901-conductive medium material; 902-coating roller; 903-scraper; 904, embossing the rubber roller; 905-a first pulley; 906-extruding the glue homogenizing roller; 907-glue homogenizing motor; 908-a belt; 909-swing arm; 911-worm gear; 912-worm; 913-a hand wheel; 914-the rotation direction of the glue homogenizing roller; 915-a second pulley; 916-swing arm swing direction; 925 — a third pulley; 920-fixed end; 921 — oscillating end; 923-a rotating shaft.
Detailed Description
The pole piece coating machine for the power battery/super capacitor is used for uniformly coating graphene slurry on an aluminum foil or a copper foil at one time and finally cutting the aluminum foil or the copper foil into required pole pieces, and the requirements are that the graphene and the metal foil have good adhesive force and extremely small contact resistance so as to reduce the heat effect and improve the rate capability.
As shown in fig. 1, the graphene coater of the present invention includes a control unit, and an unwinding unit 1, a high-voltage discharge processing device 3, a coating unit, a baking unit, and a winding unit 41, which are sequentially disposed along a moving direction of a metal foil 5; wherein the metal foil 5 is aluminum foil or copper foil.
Unwinding unit
Two, high voltage discharge processing device
The high-voltage discharge treatment is one of the main points of the invention different from the traditional pole piece coating machine, the traditional pole piece coating machine generally directly coats the base material after cleaning treatment, and corona treatment is also adopted. The corona treatment is based on the principle that high-frequency high-voltage corona discharge is utilized to discharge on the surface of a plastic to be treated, low-temperature plasma is generated, free radical reaction is generated on the surface of the plastic, and the polymer is crosslinked, the surface is roughened, the wettability of the plastic to a polar solvent is increased, the plasma enters the surface of a printed body through electric shock and permeation, the molecular structure of the plasma is damaged, the molecules of the treated surface are oxidized and polarized, and the ion electric shock erodes the surface, so that the adhesion capability of the surface of a printing stock is increased, and the corona treatment is mainly used for surface treatment of silicon rubber and plastic substrates.
According to the invention, a high-voltage discharge treatment link is arranged before a printing process, and a high-voltage discharge breakdown method is adopted, so that on one hand, grease on the surface of the metal foil is gasified, and a cleaning effect is achieved, and simultaneously, under the action of air ionization generated by a discharge electrode and ozone and oxygen atoms generated by ionization, etching and roughening treatment are carried out on the surface of the metal foil, so that pits which are equivalent to the size of coated graphene particles and are uniformly distributed are formed on the treated surface of the metal foil, a coating medium is easily embedded into the pits and is tightly combined with a substrate, the contact area and the adhesive force are improved, under the condition of reducing the usage amount of an adhesive, the contact resistance between the medium and the substrate is reduced, and the charge-discharge characteristics of a battery can be improved.
As shown in fig. 2 and 3, the high voltage discharge processing apparatus of the present invention includes a plurality of high voltage discharge processing units 29 disposed on the surface of the metal foil, each unit includes a high voltage box 82, a negative pressure air draft device, a high voltage source and a plurality of discharge electrodes 83, the discharge electrodes 83 are disposed in parallel on the circumference of the high voltage discharge roller 85 along the axial direction of the high voltage discharge roller 85, and keep a certain distance from the metal foil 5, and the discharge electrodes 83 generate an arc 86 to act on the metal foil 5. The discharge electrode 83 is arranged at the front end inside the high-voltage box 82, the negative-pressure air outlet 81 is arranged at the rear end of the high-voltage box 82, and the air outlet 81 is communicated with an external negative-pressure air draft device. Usually, 1-2 groups of high-voltage discharge processing units can be arranged around one high-voltage discharge roller 85, and each group of high-voltage discharge processing units comprises 2-6 discharge electrodes 83.
In order to satisfy the effect of etching and roughening treatment on the surface of the metal foil 5, it is generally necessary to provide a plurality of discharge electrodes 83 around the same high-voltage discharge roller 85, and these discharge electrodes 83 generate a large amount of heat during high-voltage discharge, and if the heat cannot be instantaneously discharged, a high temperature rise occurs on the surface of the metal foil, and the physical properties of the metal foil change due to annealing. Generally, a water cooling mode is adopted for heat dissipation of large heat, namely, a plurality of pipelines are processed inside the high-voltage discharge roller 85 to be filled with cold water, heat generated by the high-voltage discharge roller 85 is conducted through the metal foil and the metal high-voltage discharge roller 85 and is taken away by water, the high-voltage discharge heat can be effectively reduced by the mode, but the requirement of a carbon coating process of a power battery/super capacitor cannot be met, because after ice water is filled into the discharge roller 64, the surface of the roller body can be precooled, condensed and frosted due to temperature difference, and further water mist is generated on the surface of the metal foil 5, and an aqueous medium material is adopted in the carbon coating process, so that the performance is changed after meeting water, and the coating quality is influenced. In addition, when water flows into the high-voltage discharge roller 85, the dynamic balance of the high-voltage discharge roller 85 during rotation is affected, the rotation speed is unstable, and the coating uniformity is affected, so that only the air cooling method can be adopted.
In order to meet the requirement of large-heat air cooling, the invention adopts a high-power negative pressure air draft device, the negative pressure air draft device is connected to an air outlet 81 on the rear side of a high-pressure box body 82, meanwhile, the gap between an electrode and a metal foil is set to be 2-4mm, preferably 3mm, so that the purpose of cooling is achieved by taking away heat by large-flow air flow 84, meanwhile, the ionization effect of large-flow air under the action of high pressure is enhanced, and more ozone and oxygen atoms are generated, thereby enhancing the etching and roughening treatment on the surface of the metal foil. In addition, the high-voltage discharging roller 85 is made of aluminum alloy surface sprayed with antioxidant ceramics, has the characteristics of high temperature resistance and wear resistance, and can still maintain the original transmission precision after bearing long-time high-voltage discharge. The metal foil after the high-voltage discharge treatment needs to enter the next coating link as soon as possible, so that the metal foil, particularly the aluminum foil, is prevented from being oxidized into aluminum oxide after being exposed in the air, and the internal resistance characteristic is prevented from being influenced.
The invention adopts ceramic electrodes with the length of 600mm-1200mm, the average power loaded on each electrode is 1-2kW, the voltage frequency is 10-20KHz, the gap between the electrode and the metal foil is 2-4mm, the feeding speed of the metal foil is 50m/min-180m/min, the diameter of the high-voltage discharge roller is 320mm, 4-12 electrodes are arranged on each high-voltage discharge roller 85, and 4-12 high-voltage discharge rollers 85 with half positive and negative sides are arranged on the whole coating machine. The discharge power, the number of electrodes, the material conveying speed and the diameter of the sprayed carbon particles are related, and under the condition of determined structure, the discharge power can be adjusted to meet the spraying requirements of carbon particles with different material conveying speeds and different sizes.
The results of measuring the surface tension by brushing dyne water on the surface of the aluminum foil before and after the high-pressure treatment, observing the surface of the material by a microscope and measuring the internal resistance of the product after carbon coating show that:
(1) the aluminum foil after high-voltage discharge treatment generates pits and salient points with the average size of about 50 nm-1000 nm on the surface under the observation of a microscope, the size of the pits and the salient points is basically equivalent to that of coated graphene, and the sizes of the pits and the salient points can be changed by changing the voltage applied to electrodes so as to be suitable for graphene materials with different diameters.
The mechanism of the generation of the pits and the salient points is not known at present, but the pits generated by thermal ablation and plasma impact generated by high-voltage electric arc or the action of ozone and oxygen atoms generated by oxygen ionization are only guessed to reduce the original aluminum oxide with compact aluminum foil surface into aluminum which is not compact any more, and then the aluminum foil is in a pit structure under a microscope, and the two actions can be combined with each other.
(2) The surface tension of the aluminum foil without high-voltage discharge treatment and the aluminum foil subjected to high-voltage discharge treatment was increased from an average of 10gf to 50gf by 5 times as measured by brushing dyne water.
(3) The internal resistance of the carbon-coated aluminum foil product prepared by the same process and the same equipment is reduced to be more than 1/3 of the product without high-voltage discharge treatment, the internal resistance is close to zero under the limit condition, and the charge-discharge characteristics of the battery are obviously improved.
Third, coating unit
The coating unit comprises a middle deviation rectifying unit, a tension control device, a coating and printing device and an extrusion glue homogenizing device, and the middle deviation rectifying and tension control are needed before the coating and printing device.
(1) Middle deviation rectifying unit
The material needs intermediate rectification and tension control before coating the printing device. The middle deviation rectifying unit adopts an ultrasonic electric eye detection head, the metal foil 5 enters the middle of a double roller before coating to rectify deviation, the position of the material is ensured to be constant before entering the coating procedure, and the metal foil is ensured not to wrinkle in the deviation rectifying process. The first deviation correcting device 4 realizes the integral deviation correction of the base material before the discharge treatment and ensures the consistency of the transverse position of the whole metal foil during the high-voltage discharge surface treatment; a second deviation correcting device 16 is arranged before coating, so that the constancy of the transverse position of the material and the position of a coating roller during coating is ensured; and a third deviation correcting device 28 is arranged before rolling, so that the neatness of the end face of the finished product after rolling is ensured. According to the precision requirement of metal foil transmission, a plurality of groups of other intermediate deviation rectifying units can be arranged.
(2) Tension control device
The tension control device aims to keep the tension of the metal foil constant and the transverse position stable in the whole coating process, especially in the coating process, the uniformity and consistency of the printing material on the surface of the metal foil can be ensured only by printing and coating under constant tension, and finally, the consistency and stability of the conductive characteristics of the prepared carbon-coated metal foil are ensured.
The invention arranges a plurality of groups of tension control devices in the coating link, wherein the first tension control device 7 is arranged before feeding, drawing and coating, so that the constant tension and the stable transverse position of the material during coating are ensured; the second tension control device 17 is arranged before rolling, so that the tension stability of the rolled finished product is ensured. According to the transmission precision requirement of the metal foil, similar tension control devices can be arranged in the unreeling and feeding traction links and other intermediate links, so that the tension in the whole processing process is ensured to be constant and the transverse position of the base material is stable.
As shown in fig. 4 to 6, the tension control device of the present invention includes a driving roller 701, a large gear 704, a swing link 707, a swing roller 708, a cylinder 705, a potentiometer 709, and a control hub 710. During normal operation, the metal foil 5 sequentially advances along the schematic direction of the driving roller 701, the upper rotating roller 715, the swing roller 708 and the lower rotating roller 716, and the driving roller 701 is driven by the motor 702, or the driving roller 701 is driven by the motor through the synchronous belt to rotate. The core component is a swing rod 707 along the vertical direction, and a swing roller 708 is fixed at the lower end of the swing rod 707. The upper end of the swing rod 707 is fixed with the bull gear 704 and can swing along the axis of the bull gear 704; the air cylinder 705 is fixed on the support, a piston rod 706 of the air cylinder 705 is fixed in the middle of the swing rod 707 through a movable hinge, and the piston rod 706 extends and retracts along with the swing of the swing rod 707.
A potentiometer 709 is arranged at a corresponding position of the large gear 704, a small gear 703 is arranged at a shaft head of a potentiometer rotating shaft 712, the large gear 704 and the small gear 703 are matched in parameters and meshed with each other, when the swing rod 707 swings, the large gear 704 is driven to rotate by a small angle, and meanwhile, the small gear 703 is driven to rotate by a large angle, so that the resistance of the potentiometer 709 is changed.
The small gear 703, the large gear 704 and the swing link 707 play a role of angle amplification and measurement, and a slight change angle of the swing link 707 is reflected on the resistance change of the potentiometer 709 through the amplification effect of the large gear and the small gear.
In actual operation, as shown in fig. 6, the tension of the metal foil is applied to the swing roller 708 to form pulling forces F2 and F3 to the swing roller, and the air cylinder generates a pulling force F1 to the swing link 707 in negative pressure operation, wherein the directions of F1, F2 and F3 are opposite. In a balanced state, when the swing link 707 is vertically downward, F1 and F2+ F3 keep moment balance, then the resistance parameter of the potentiometer 709 is recorded as R, once the tension of the metal foil 5 is suddenly increased, that is, F2+ F3 is increased, the moment balance on the swing link 707 is broken, the swing link 707 rotates counterclockwise around the rotating shaft, deviates from the vertical position, and after the angle of the big gear and the small gear is amplified, the resistance R of the potentiometer 709 changes, if the resistance R is increased, the control hub 710 adjusts the input electrical parameter of the motor 702 according to the increase amplitude of the resistance R, so that the output rotating speed of the motor 702 is increased, the rotating speed of the active roller 701 is increased, at the moment of increase, more metal foils 5 are released onto the swing roller 708, the swing roller 708 can overcome the action of F2 and F3 under the pulling force of F1 and restore to the balanced position, the resistance of the potentiometer 709 returns to R, the control hub 710 can drive the output rotating speed of the motor 702 to the normal parameter, thereby keeping the tension of the metal foil constant. Vice versa, that is to say that the change of tension all is through the pendulum rod and the angle amplification effect of size, feeds back to the change of potentiometre resistance, further compensates through the rotational speed of adjusting driving motor for the tension of metal foil keeps invariable all the time.
It should be noted that the air cylinder 705 of the present invention is communicated with the air storage tank 711, and the output pressure F1 of the air storage tank 711 can change the pressure by changing the parameter of the pressure regulating valve through the control center 710, so as to meet the requirements of different metal foil tensions. In addition, since the rotation angle of the large gear 704 is limited, a half gear structure can also be adopted; cylinder 705 is a low friction cylinder with negligible resistance to piston movement. The whole coating machine is provided with a plurality of groups of tension control mechanisms which are respectively used for tension control of a plurality of links before coating, before rolling and the like.
(3) Coating and printing device
The existing rubber roller coating unit adopts a coating roller to be soaked in a liquid material, a conductive medium material is adhered to a roller body during operation, the material is uniformly coated on a metal foil by an embossing rubber roller after redundant materials are hung by a scraper, the coating layer of the scheme is thick in thickness and poor in uniformity, and the requirements of graphene coating thickness and uniformity are difficult to meet.
As shown in fig. 7-9, the graphene coating and printing device 8 includes a pressing roller 35, a driving silica gel roller 34 and a driving steel roller 32 which are stacked from top to bottom, and the driving silica gel roller 34 and the driving steel roller 32 rotate in opposite directions and maintain a certain gap, which is in the micron order. The driving steel roller 32 is immersed in the colloid pool 31, the substrate 5 is arranged between the press roller 35 and the driving silica gel roller 34, and is supported on the support roller 350 to advance under the power traction, and the advancing direction of the support roller is consistent with the centrifugal force direction of the upper peak of the driving silica gel roller 34. Preparing materials in the colloid pool 31 in advance, and preparing the graphene and the solvent into a viscous liquid material; the viscosity coefficient is measured by using a No. 3 Engler cup, and the flow-through time is 15-25 seconds.
The press roller 3 is driven by a lifting unit to lift, the lifting unit is preferably provided with a press roller cylinder 353, the press roller cylinder 353 pushes an upper slide block 359 arranged on the rack 304, and the slide block 359 is fixedly connected with the shaft end support 308 so as to drive the press roller 3 to move up and down. The shaft end supports 308 realize the rotation support of the press roll 3, and simultaneously, the shaft end supports 308 are arranged at the two ends of the press roll 3 along with the up-and-down movement of the sliding blocks 359, and two press roll air cylinders 353 which can synchronously lift are configured, so that the lifting of the whole press roll 3 is realized.
As shown in fig. 7, the press roller 3 is separated from the base material 5 and does not rotate before the coating operation. As shown in fig. 8, when coating starts, the pressing roller 35 presses the substrate 5 to the upper surface of the active silica gel roller 34 by the pressing roller cylinder 353, and at this time, the substrate 5 moves forward to drive the pressing roller 35 to rotate. The driving silica gel roller 34 and the driving steel roller 32 are driven by respective driving mechanisms, and the driving mechanisms preferably adopt a belt wheel 315 and a driving belt 316, wherein the driving belt adopts a synchronous belt driving system without noise and with better synchronous performance, and can also adopt other modes such as gear driving and the like.
In the coating process, the liquid material in the colloid pool 31 is driven to the surface of the driving silica gel roller 34 by the driving steel roller 32, a thin-layer adhesive film 33 is formed under the extrusion, stretching and extension actions of the two rollers, and the thin-layer adhesive film is transferred to the continuously fed base material 5 through the pressing roller 35, so that the coating of the base material is realized. There is a gap between the drive silica gel roller 34 and the drive steel roller 32, and there is a speed difference between the two rollers, wherein the drive silica gel roller 34 rotates faster than the drive steel roller 32, and the rotation speed ratio is related to the colloid viscosity coefficient and the coating thickness.
As can be seen from fig. 8, the liquid viscous material in the colloid pool 31 is driven to the right side of the roller body by the driving steel roller 32, and is extruded, stretched and extended through the gap between the driving silica gel roller 34 and the driving steel roller 32, and the driving silica gel roller 34 has a higher rotation speed than the driving steel roller 35, so that the colloid is rolled and expanded by the rotation speed difference, the colloid passing through the gap forms a colloid film 33 adhered to the left side of the driving silica gel roller 34, the colloid film 33 rotates to the position of the substrate 5 along with the driving silica gel roller 34, and is transferred to the lower surface of the substrate 5 under the action of the pressing roller 35, so as to form a thin material film. In order to make the transfer printing uniform and ensure the consistency of material film coating, the advancing speed of the substrate 5 is required to be consistent with the linear speed of the upper vertex of the active silica gel roller 34, and only if the linear speeds of the substrate 5 and the active silica gel roller 34 are kept consistent, the material can not be accumulated and lacked on the substrate 5, and the consistency before and after the transfer printing is ensured, and the press roller 35 rotates under the drive of the substrate 5.
In order to adapt to parameters such as viscosity and fluidity of different colloids and spraying thickness, the speed difference between the driving silica gel roller 34 and the driving steel roller 32 is adjusted by adjusting the rotating speed of the belt wheel, and the gap between the driving silica gel roller 34 and the driving steel roller 32 is also adjustable, and the adjustment principle is shown in fig. 7-9. A strip-shaped pressure plate 351 is arranged at the shaft end of the driving silica gel roller 34, and the fixed end of the strip-shaped pressure plate 351 (namely, the left part of the strip-shaped pressure plate in fig. 7 and 8) is movably connected to the frame 304 through a hinge shaft 352, can rotate around the hinge shaft 352 and cannot move; the movable end of the strip-shaped pressing plate 351 (namely, the right part of the strip-shaped pressing plate in fig. 7 and 8) is fixedly connected with the piston rod of the rubber roll cylinder 354 through a hinge, and the movable end can be finely adjusted up and down under the action of the rubber roll cylinder 354; and the shaft end support 308 of the driving silica gel roller 34 is fixedly connected to the middle part of the strip-shaped pressing plate 351, preferably, a through hole is formed in the middle part of the strip-shaped pressing plate 351, and the shaft end support 308 is supported and limited on the through hole. Under the action of the rubber roller cylinder 354, the movable end of the strip-shaped pressing plate 351 moves up and down, so that the driving silica gel roller 34 is driven to move up and down slightly. In order to prevent the adjustment displacement from being too large, the lower part of the movable end of the strip-shaped pressing plate 351 is provided with the limiting block 355, so that the movable end stops moving after touching the limiting block 355 in the displacement adjustment process, the active silica gel roller 34 is protected, and the minimum coating thickness is ensured. The stopper 355 is fixed to the frame plate 356 by means of screws, and fine adjustment of a minute displacement of the stopper 355 is achieved by fine adjustment threads. The upper and lower positions of the driving steel roller 32 can not be adjusted, and the driving steel roller is fixed on the frame 304 by shaft end supports 308 at two ends. The driving steel roller 32 and the press roller 35 are both steel smooth rollers with chrome-plated surfaces, and the driving silica gel roller 34 is a soft roller made of silica gel material, and the surface of the soft roller has certain elasticity.
In addition, in order to keep the uniformity of glue layer coating, the press roller 35, the driving silica gel roller 34 and the driving steel roller 32 are all of hollow shaft structures, a heating unit is arranged in the hollow shaft, the heating unit can be a heating rod fixed on the rack 304, the roller keeps still when rotating, and the heating rod realizes the constancy of temperature through a temperature control device of the control unit; in addition, the bottom of the colloid pool 31 is also provided with a heating device. The aim is to ensure that the temperature and the deformation of the base material are consistent in the coating process, and simultaneously the temperature, the density and the viscosity of the colloid are kept consistent front and back, so that the coated medium film is relatively uniform.
Except adopting the electrical heating rod, also can adopt the oil heating roller that the papermaking industry commonly adopted, that is to say press roller 35, initiative silica gel roller 34 and initiative steel roll 32's the inside oil duct that is provided with of roll body, the oil duct of roll body inside is injected into with the oil that heats through rotary joint to adopt PID automatic temperature control to realize the constant temperature on roll body surface, make the medium film after the coating just can be more even. Test results show that the linear velocity ratio of the active silica gel roller 34 to the active steel roller 32 is 1.1-1.5, preferably 1.3 times, so that the optimal coating effect can be achieved, the graphene with submicron and thinner thickness is uniformly coated on the surface of the metal foil 5, the thickness of the currently prepared graphene is distributed between 50nm and 1000nm, the internal resistance of the prepared carbon-coated metal foil product is far smaller than that of a carbon nano tube and nano graphite under the same process, the internal resistance is close to zero under the limit condition, and the charge-discharge characteristic of the battery is remarkably improved.
(4) Extrusion glue homogenizing device
The purpose of extruding and glue homogenizing is to ensure that the coated medium is more uniform, and medium material particles are pressed into pits on the surface of the material through an extruding process, so that the adhesive force is stronger. As shown in fig. 10, the extrusion glue leveling device 43 is added after the coating of the coating machine is finished, and the coating machine is pressed and leveled under the condition that the material particles are not dried, so that the contact area between the material particles and the substrate is further increased, the internal resistance of the finished product is reduced, and the product quality is improved.
The core of the extrusion glue homogenizing device is an extrusion glue homogenizing roller 906 which rotates at a high speed, a power transmission unit and a pressure adjusting unit. The extrusion leveling roller 906 is mounted on a swing arm 909, pressed against the surface of the metal foil 5 on which the conductive medium material is just coated with a certain pressure, and driven by power to rotate in a direction opposite to the advancing direction of the metal foil 5.
The power transmission unit comprises a glue homogenizing motor 907, a first belt wheel 905, a second belt wheel 915, a third belt wheel 925 and a corresponding belt 908, wherein the extrusion glue homogenizing roller 906 is arranged at the swinging end 921 of the swinging arm 909, the fixed end 920 of the swinging arm is movably connected to the rack through a rotating shaft 923, the glue homogenizing motor 907 fixed on the rack drives the third belt wheel 925 to rotate, the second belt wheel 915 and the first belt wheel 905 are driven to rotate through the belt, the first belt wheel 905 and the extrusion glue homogenizing roller 906 are coaxially connected and synchronously rotate, the glue homogenizing motor 907 adopts a variable-frequency speed-regulating motor, and the rotating speed can be regulated according to different materials.
The pressure adjusting unit comprises a worm gear 911 and a worm 912, wherein the worm gear 911, the first belt pulley 905 and the extrusion glue homogenizing roller 906 are all arranged on a swing arm 909, the worm gear 911 is fixedly connected to a fixed end 920 of the swing arm 909, and can rotate around a rotating shaft 923 under the driving of the rotation of the worm 912. The worm 912 is fixed on the frame, a hand wheel 913 is arranged at the front end of the worm, the hand wheel 913 is rotated, the worm 912 rotates along with the hand wheel 913, the worm wheel 911 is driven to rotate around the axis, the swing arm 909 swings by a certain angle along the swing arm swing direction 916 in the figure, the extrusion glue homogenizing roller 906 is pressed on the surface of the metal foil 5, the pressure can be adjusted through the hand wheel 913, and the self-locking lower pressure of the worm gear keeps constant after the adjustment is finished.
Therefore, the extrusion roller 906 is pressed on the surface of the metal foil 5 at a certain pressure and runs at a high speed, and the rotation direction 914 of the roller is opposite to the advancing direction of the metal foil 5, so that the coated material is smoothed and compacted in the pits obtained by high-voltage discharge treatment, the contact area of the material particles and the substrate is further increased, and the internal resistance of the carbon-coated metal foil product is reduced.
The extrusion glue homogenizing roller 906 is plated with hard chrome on the surface after the quenching and tempering treatment of 45# steel, the plating layer is thick enough, the maximum linear speed reaches 150m/min, the adjustment of pressure and rotating speed can be realized, and the requirements of different fabrics are met.
Fourthly, baking unit
In order to realize rapid molding of the sprayed product, the coated product needs to be baked. The drying tunnel adopts a specific scheme of gradient temperature rise and gradient temperature reduction, each drying tunnel is composed of a plurality of drying ovens, under the condition of continuous high-speed production, the gradient temperature rise and temperature reduction of the coated coiled material are realized, the wrinkles caused by sudden heat and sudden cold of the metal foil are overcome, the product quality is ensured, and the continuous high-speed uninterrupted coating production is ensured.
In fig. 1, the baking unit 12 includes a vertical baking channel and a plurality of horizontal baking channels, each baking channel is about 2-5 meters in length, and the metal foil is heated and cooled in stages from 40-120-200-100 ℃ to normal temperature by adopting a mode of combining an electric heating heat exchanger with a high-pressure fan for blowing under the condition of continuous production of a coating machine. The temperature control adopts a PID (proportion-integration-differentiation controller) automatic temperature control mode, and ensures that the temperature control precision reaches 1 ℃.
The method of controlling temperature step by step overcomes the wrinkle caused by sudden heating and sudden cooling of the metal foil 5 under the condition of continuous high-speed production, ensures the product quality and ensures continuous high-speed uninterrupted coating production.
In addition, the metal foil is supported in the whole drying tunnel by tension, is connected with external power by a synchronous belt and is driven, and the bearing is arranged outside the drying oven. The driving roller of drying tunnel is the mirror roller, and steel surface chromium plating is and through the super lappingout processing, and the finish is 0.8, and mirror roller machining precision is high, frictional force is little, can avoid the damage of roll body surface to the material in the transmission, reduces pincher trees, satisfies the requirement of precision drive. The mirror roller is adopted for supporting during baking, so that the influence of uneven tension on the product during suspension baking is avoided.
Fifth, rolling unit
The traction of the winding unit 41 adopts a pair of steel rollers and rubber rollers to carry out pressing and rolling traction, and the surfaces of the steel rollers are plated with chrome. The press fit and separation of the rubber roller are pneumatically controlled, and are reversed by an electromagnetic reversing valve, and the pressure of the cylinders at two ends can be displayed and adjusted. The unreeling traction motor is controlled by the tension of a floating roller, the wrap angle of the metal foil on the floating roller is large, and the floating roller is a surface anode alumina roller.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and finishes can be made without departing from the spirit of the invention, such as treating both surfaces of a metal foil with a high voltage discharge treatment unit, performing a double-sided coater bake, etc., and such modifications and finishes are also considered to be within the scope of the invention.
Claims (9)
1. A device for coating graphene on the surface of a metal foil is characterized in that: the device comprises a control unit, and an unreeling unit (1), a coating and printing device, a baking unit and a reeling unit (41) which are sequentially arranged along the movement direction of a metal foil (5), wherein the metal foil (5) is an aluminum foil or a copper foil;
the coating and printing device comprises a press roller (35), a driving silica gel roller (34) and a driving steel roller (32) which are arranged from top to bottom in a laminated mode, wherein the driving steel roller (32) is a steel smooth roller, and the driving silica gel roller (34) and the driving steel roller (32) rotate in opposite directions and keep a micron-sized gap; the driving steel roller (32) is immersed in a colloid pool (31) filled with graphene viscous materials, the metal foil (5) is arranged between the pressing roller (35) and the driving silica gel roller (34), the metal foil (5) is supported on the supporting roller (350) and moves along the centrifugal force direction of the upper vertex of the driving silica gel roller (34) under the traction of power, and the pressing roller (35) presses and attaches the metal foil (5) to the upper surface of the driving silica gel roller (34) under the driving of the lifting unit; the graphene viscous material is adhered to the surface of the roller body by the driving steel roller (32), a colloid film (33) adhered to the surface of the driving silica gel roller (34) is formed after extrusion and extension of a gap between the driving silica gel roller (34) and the driving steel roller (32), and then the colloid film is transferred to the surface of the metal foil (5) by the pressing roller (35), so that uniform graphene viscous material film coating with micron-level or submicron-level thickness is realized; the linear speed ratio of the rotating speed of the driving silica gel roller (34) to the rotating speed of the driving steel roller (35) is 1.1-1.5 times, and the moving speed of the metal foil (5) is consistent with the linear speed of the upper vertex of the driving silica gel roller (34); the pressing roller (35), the driving silica gel roller (34) and the driving steel roller (32) are all of hollow shaft structures, a heating unit is arranged in the hollow shaft, and the heating unit is a heating rod or flowing heat conduction oil;
the baking unit (12) comprises a plurality of drying channels which are connected in series, segmented temperature rise and temperature reduction of the metal foil from 40-120-200-100-normal temperature is achieved, driving rollers (23) are arranged in the drying channels at intervals, the metal foil is supported on the driving rollers (23), and the driving rollers (23) drive the metal foil (5) to move under the driving of a power transmission device outside the drying channels.
2. The apparatus of claim 1, wherein: and the gap between the driving silica gel roller (34) and the driving steel roller (35) can be adjusted.
3. The apparatus of claim 1, wherein: the device for coating the graphene on the surface of the metal foil further comprises a high-voltage discharge processing device (3) arranged between the unreeling unit (1) and the coating printing device, wherein the high-voltage discharge processing device (3) comprises a plurality of high-voltage discharge processing units (31) arranged on the surface to be processed of the metal foil (5), and each high-voltage discharge processing unit comprises a high-voltage box body (82), a negative pressure air draft device, a high-voltage source and a plurality of strip-shaped discharge electrodes (83); the metal foil (5) is wound on the high-voltage discharge roller (85), and the discharge electrode (83) is arranged at the front end of the opening of the high-voltage box body (82) and is arranged on the circumference of the high-voltage discharge roller (85) in parallel along the axial direction of the high-voltage discharge roller (85); the discharge electrode (83) keeps a gap with the metal foil (5), and generates an electric arc (86) to act on the metal foil (5) so as to generate pits and bumps on the surface of the metal foil; the rear end of the high-pressure box body (82) is provided with a negative pressure air outlet (81), and the air outlet (81) is communicated with an external negative pressure air draft device.
4. The apparatus of claim 3, wherein: the gap between the discharge electrode (83) and the metal foil is 2-4 mm.
5. The apparatus of claim 1, wherein: the device for coating the graphene on the surface of the metal foil further comprises an extrusion glue homogenizing device which is arranged in the coating and printing device in the follow-up manner; the extrusion glue homogenizing device comprises a power transmission unit, a pressure adjusting unit and an extrusion glue homogenizing roller (906), wherein the extrusion glue homogenizing roller (906) is arranged on a swing arm (909) and is pressed and attached to the surface of the metal foil coated with the graphene viscous material under the action of the pressure adjusting unit, and the extrusion glue homogenizing roller (906) rotates along the reverse direction of the movement direction of the metal foil under the driving of the power transmission unit.
6. The apparatus of claim 5, wherein: the swing arm (909) comprises a fixed end (920) and a swing end (921), the fixed end (920) is movably connected to the frame through a rotating shaft (923), the extrusion glue homogenizing roller (906) is arranged at the swing end (921) of the swing arm (909), and the pressure adjusting unit changes the swing angle of the swing arm (909), so that the extrusion glue homogenizing roller (906) is pressed on the surface of the metal foil coated with the graphene viscous material.
7. The apparatus of claim 5, wherein: the power transmission unit comprises a first belt wheel (905), a second belt wheel (915), a third belt wheel (925) and a glue homogenizing motor (907), the first belt wheel (905) is arranged at the swinging end (921) of the swinging arm (909), the second belt wheel (915) is arranged at the fixed end (920) of the swinging arm (909), the first belt wheel (905) is coaxially connected with the extrusion glue homogenizing roller (906), the third belt wheel (925) and the glue homogenizing motor (907) are arranged on the rack, the glue homogenizing motor (907) drives the third belt wheel (925) to rotate, the belt (908) drives the second belt wheel (915) to rotate, and drives the first belt wheel (905) and the extrusion glue homogenizing motor (906) to synchronously rotate.
8. The apparatus of claim 1, wherein: the device for coating the graphene on the surface of the metal foil further comprises a plurality of tension control devices arranged in a coating link, wherein each tension control unit comprises a driving roller (701), a swinging roller (708), a large gear (704), a small gear (703), a potentiometer (709), a swinging rod (707), an air cylinder (705) and a control center (710); the swing rod (707) is arranged along the vertical direction, the swing roller (708) is arranged at the lower end of the swing rod (707), and the upper end of the swing rod (707) is fixedly connected with the large gear (704) and swings along the axis of the large gear (704); a piston rod (706) of the air cylinder (705) is fixed in the middle of the swing rod (707) through a movable hinge and stretches along with the swing piston rod (706) of the swing rod (707); the pinion (703) is arranged on the shaft head of the potentiometer rotating shaft (712) and is meshed with the bull gear (704); the metal foil (5) is arranged on the driving roller (701) and the swing roller (708), the driving roller (701) is provided with a power driving device, and the control center (710) is electrically connected with the power driving device and the potentiometer (709).
9. The apparatus of claim 8, wherein: the cylinder (705) is communicated with the air storage tank (711), the control center (710) is electrically connected with a pressure regulating valve of the air storage tank (711), and the control center (710) adjusts the parameters of the pressure regulating valve to realize the adjustment of the output pressure of the air storage tank (711).
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| CN202944926U (en) * | 2012-11-28 | 2013-05-22 | 泉州市丰泽区东方机械有限公司 | Swing roller tension control mechanism used for tape casting machine |
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| CN104695201B (en) * | 2015-03-10 | 2016-09-21 | 渤扬复合面料科技(昆山)有限公司 | Convertible electrode group textile atmospheric plasma processing mechanism and double treatment mechanism |
| CN205949224U (en) * | 2016-07-13 | 2017-02-15 | 蔡蔚珍 | Glue -even device |
| CN205966362U (en) * | 2016-08-26 | 2017-02-22 | 苏州爱可姆机械有限公司 | Nick transfer coating head |
| CN207325175U (en) * | 2017-09-18 | 2018-05-08 | 陕西浩合机械有限责任公司 | A kind of device in metal foil surface coating graphene |
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