CN104842626A - Lithium strip production method - Google Patents
Lithium strip production method Download PDFInfo
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- CN104842626A CN104842626A CN201510211694.8A CN201510211694A CN104842626A CN 104842626 A CN104842626 A CN 104842626A CN 201510211694 A CN201510211694 A CN 201510211694A CN 104842626 A CN104842626 A CN 104842626A
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- base material
- lithium band
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- lithium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/10—Removing layers, or parts of layers, mechanically or chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/10—Batteries
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- Engineering & Computer Science (AREA)
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a lithium strip production method. The lithium strip production method includes firstly, performing surface treatment, namely, placing a to-be-rolled lithium strip between a first base material and a second base material, and subjecting surfaces, contacting with the to-be-rolled lithium strip, of the first base material and the second base material to surface treatment so as to enable adsorption force between the first base material and the to-be-rolled lithium strip to be higher than that between the second base material and the to-be-rolled lithium strip; secondly, rolling, namely, rolling the to-be-rolled lithium strip as well as the first and second base materials on two sides of the to-be-rolled lithium strip to enable the to-be-rolled lithium strip and the first and second base materials are laminated together; thirdly, stripping, namely, stripping the second base material from a laminated integral of the lithium strip, the first base material and the second base material; finally, passivating, namely, subjecting the exposed surface of the lithium strip to passivating treatment. The lithium strip production method is capable of ensuring no strip breakage and no bonding during lithium strip production.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to a kind of lithium band production method.
Background technology
Lithium is described as " Energy Star " by scientist, and two primary cells using lithium as negative electrode active material have unrivaled advantage.But, because lithium chemistry is active, be easy at normal temperatures and the reaction such as the oxygen in air, nitrogen, moisture, so the processing of battery grade lithium band faces higher challenge.Usually, easily there is adhesion phenomenon in battery grade lithium band, causes broken belt in process of production.
Summary of the invention
The object of the present invention is to provide a kind of adhesion and the lithium band production method of not easily broken belt.
For achieving the above object, the present invention proposes a kind of lithium band production method,
Comprise following raw materials: the first base material, the second base material and lithium band to be rolled, comprise the following steps:
Roll-in: described first base material, described lithium band to be rolled and described second base material are stacked gradually and places and carry out roll-in by rolling device, three is pressed together, wherein, the both sides of described lithium band to be rolled are covered completely by described first base material and described second base material respectively;
Peel off: described second base material is peeled off from the lithium band pressed together by described rolling device, described first base material and described second base material.
Further, also comprise before the step of described roll-in: regulate the heating-up temperature of described rolling device, pressure, gap and speed specifically to comprise: the step of the heating-up temperature of the described rolling device of described adjustment, pressure, gap and speed comprises:
Heat for two of roll-in working rolls in described rolling device, the heating-up temperature of described working roll regulates between 35-120 DEG C;
The pressure of described working roll is regulated between 0.2 ~ 1.5MPa;
Gap between described working roll is regulated between 0-5mm;
The speed of described working roll is regulated between 0.001-60m/min.
Further, the described speed of described working roll adjustment between 0.001-60m/min comprises further:
The speed of working roll slow for two described working roll medium velocities and the speed ratio of fireballing working roll are controlled between 0.3%-100%.
Further, the speed of the working roll that described two working roll medium velocities are slow and the speed ratio of fireballing working roll control between 5%-30%.
Further,
Described first base material is high-molecular diaphragm, metallic membrane or inorganic material diaphragm;
And/or
Described second base material is high-molecular diaphragm, metallic membrane or inorganic material film.
Further, described first base material and described second base material adopt one or more the combination in Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene (PTFE), polyarylsulfone (PAS), polyethylene terephthalate ether, acrylonitrile-butadiene-styrene copolymer, polyimides or polyether sulfone to make respectively.
Further, also comprised the following steps: before the step of described roll-in
Surface treatment: respectively surface treatment is carried out to the surface that described first base material and described second base material contact with described lithium band to be rolled and make the absorption affinity between described first base material and described lithium band to be rolled be greater than absorption affinity between described second base material and described lithium band to be rolled.
Further, also comprise before described surface-treated step:
Passivation in advance: be placed in drying shed by described lithium band to be rolled, passivation gas be sprayed on surface that described lithium band to be rolled exposes and carry out Passivation Treatment, passivation time is 5-20 hour.
Further, also comprise after the step of described stripping;
Passivation: Passivation Treatment is carried out to the surface that described lithium band exposes.
Further, also comprise after the step of described stripping:
Rolling: by the lithium band rolling containing described first base material.
Lithium band production method in the embodiment of the present invention carries out common roll pressure by employing first base material, the second base material and lithium band to be rolled, and the mode being carried out peeling off by the second base material more afterwards can to guarantee in lithium band production process not broken belt, not bonding.
Accompanying drawing explanation
Fig. 1 is the structural representation of lithium band production equipment in one embodiment of the invention.
Fig. 2 is the fit structure schematic diagram of rolling device, stripping off device and passivating device in one embodiment of the invention.
Fig. 3 is the schematic flow sheet of lithium band production method in one embodiment of the invention.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with accompanying drawing, illustrated embodiment, only for explaining the present invention, is not intended to limit scope of the present invention.For those of ordinary skill in the art, under the prerequisite not paying creative work, according to all embodiments that the present invention's spirit obtains, all belong to protection scope of the present invention.
Fig. 1 is the structural representation of lithium band production equipment in one embodiment of the invention.As shown in fig. 1, lithium band production equipment 100 comprises lithium band unwinding device 110, first unwinding device 120, second unwinding device 130, Deviation rectifier 141, seal operation room 150, rolling device 160, film-removing device 170, passivating device 180 and wrap-up 190.Wherein, lithium band 210, first base material 220 carried by lithium band unwinding device 110, first unwinding device 120 and the second unwinding device 130 respectively and the second base material 230 enter the rolling device 160 be located in seal operation room 150 through Deviation rectifier 141; After rolling device 160 roll-in, the second base material 230 is peeled off and rolling by film-removing device 170 from lithium band 210, first base material 220 pressed together and the second base material 230; Afterwards, wrap-up 190 is by the lithium band 210 after passivating device 180 processes and the first base material 220 rolling of bonding with lithium band 210.
Particularly, lithium band unwinding device 110 comprises lithium band let off roll 111, lithium tape speed test roller 112 and lithium belt tension control roll 113.Wherein, lithium band let off roll 111 is for installing pending lithium band 210.The supplied materials thickness range of the lithium band 210 of process can at 0.040-1500mm.In one embodiment, lithium band let off roll 111 can unreel lithium band 210 under lithium band magnetic controller 1111 controls, to guarantee that lithium band 210 keeps certain tension force unreeling in process.The torque range of magnetic controller 1111 can be 2-400N/m, and precision can be ± 1N/m.
Lithium tape speed test roller 112 is arranged between lithium band let off roll 111 and lithium belt tension control roll 113.When lithium band production equipment 100 is in position shown in Fig. 1, let off roll 111, lithium tape speed test roller 112 and lithium belt tension control roll 113 in the vertical direction interval are arranged, and lithium tape speed test roller 112 to be positioned at below lithium band let off roll 111 and to be positioned at above lithium belt tension control roll 113.Lithium tape speed test roller 112 can be used for testing and controls to unreel the speed of lithium band 210, to guarantee that the speed of lithium band 210 before charging meets the tensile requirements of lithium band let off roll 111 and lithium belt tension control roll 113.In one embodiment, the velocity interval of velocity test roller 112 can be 0.01-300m/min, and precision can be ± 0.01m/min.
Tension control roll 113 can be used for guaranteeing that lithium band 210 keeps linear feed in transport process, does not occur that lithium band 210 is piled up or breaks.Tension control roll 113 also can be used for regulating lithium band 210 in the size unreeling tension force in process.In one embodiment, the moment of torsion control range of tension control roll 113 can be 5-250N/m, and precision can be ± 1N/m.When lithium band production equipment 100 is in position shown in Fig. 1, the lithium band 210 carried towards Deviation rectifier 141 and rolling device 160 through tension control roll 113 is roughly advanced along horizontal direction.
First unwinding device 120 is arranged between lithium band unwinding device 110 and Deviation rectifier 141.First unwinding device 120 comprises the first let off roll 121, First Speed test roller 122, first tension control roll 123 and the first carry-over pinch rolls 124.When lithium band production equipment 100 is in position shown in Fig. 1, first let off roll 121, First Speed test roller 122, first tension control roll 123 and the first carry-over pinch rolls 124 in the vertical direction are from up to down arranged at interval, and the first carry-over pinch rolls 124 are positioned at the top of lithium band 210.
Wherein, the first let off roll 121 is for installing the first base material 220.The material of the first base material 220 can not react with lithium band 210.The thickness range of the first base material 220 can be 1-3000 μm.In one embodiment; the material of the first base material 220 can be one or more combinations in Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene (PTFE), polyarylsulfone (PAS) polyethylene terephthalate ether, acrylonitrile-butadiene-styrene copolymer, polyimides, polyether sulfone, Copper Foil, aluminium foil, non-woven fabrics, Ge Laxin paper or fibre paper; and be preferably acrylonitrile-butadiene-styrene copolymer, polyimides; its material has larger hot strength and good elastic deformation, can play good cushioning and protection for lithium band to be rolled.First let off roll 121 can unreel the first base material 220 under the first magnetic controller 1211 controls, to guarantee that the first base material 220 keeps certain tension force unreeling in process.The torque range of the first magnetic controller 1211 can be 2-400N/m, and precision can be ± 1N/m.
First Speed test roller 122 is arranged between the first let off roll 121 and the first tension control roll 123.First Speed test roller 122 can be used for testing and controls to unreel the speed of the first base material 220, to guarantee that the speed of the first base material 220 before charging meets the tensile requirements of the first let off roll 121 and the first tension control roll 123.In one embodiment, the velocity interval of First Speed test roller 122 can be 0.01-300m/min, and precision can be ± 0.01m/min.
First tension control roll 123 can be used for guaranteeing that the first base material 220 keeps linear feed in transport process, does not occur that the first base material 220 is piled up or is out of shape.First tension control roll 123 also can be used for adjustment first base material 220 in the size unreeling tension force in process.In one embodiment, the moment of torsion control range of the first tension control roll 123 can be 5-250N/m, and precision can be ± 1N/m.
First carry-over pinch rolls 124 to be arranged on above lithium band 210 and to close on Deviation rectifier 141.Carry-over pinch rolls 124 can be used for the first base material 220 guiding to enter Deviation rectifier 141.
Second unwinding device 130 is arranged between lithium band unwinding device 110 and Deviation rectifier 141, and is positioned at the both sides of lithium band 210 or Deviation rectifier 141 with the first unwinding device 120.When lithium band production equipment 100 is in position shown in Fig. 1, second unwinding device 130 is positioned at the below of lithium band 210 or Deviation rectifier 141, first unwinding device 120 is positioned at the top of lithium band 210 or Deviation rectifier 141, and namely the first unwinding device 120 and the second unwinding device 130 in the vertical direction are positioned at the both sides of lithium band 210 or Deviation rectifier 141.
Wherein, the second unwinding device 130 comprises the second let off roll 131, second speed test roller 132, second tension control roll 133 and the second carry-over pinch rolls 134.Second let off roll 131 is for installing the second base material 230.The material of the second base material 230 can not react with lithium band 210.The thickness range of the second base material 230 can be 1-3000 μm.In one embodiment; the material of the second base material 230 can be one or more combinations in Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene (PTFE), polyarylsulfone (PAS) polyethylene terephthalate ether, acrylonitrile-butadiene-styrene copolymer, polyimides, polyether sulfone, Copper Foil, aluminium foil, non-woven fabrics, Ge Laxin paper or fibre paper; preferred acrylonitrile-butadiene-styrene copolymer, polyimides; its material has larger hot strength and good elastic deformation, can play good cushioning and protection for lithium band to be rolled.Second let off roll 131 can unreel the second base material 230 under the second magnetic controller 1311 controls, to guarantee that the second base material 230 keeps certain tension force unreeling in process.The torque range of magnetic controller 1311 can be 2-400N/m, and precision can be ± 1N/m.
Second speed test roller 132 is arranged between the second let off roll 131 and the second tension control roll 133.Second speed test roller 132 can be used for testing and controls to unreel the speed of the second base material 230, to guarantee that the speed of the second base material 230 before charging meets the tensile requirements of the second let off roll 131 and the second tension control roll 133.In one embodiment, the velocity interval of second speed test roller 122 can be 0.01-300m/min, and precision can be ± 0.01m/min.
Second tension control roll 133 can be used for guaranteeing that the second base material 230 keeps linear feed in transport process, does not occur that the second base material 230 is piled up or is out of shape.Second tension control roll 133 also can be used for adjustment second base material 230 in the size unreeling tension force in process.In one embodiment, the moment of torsion control range of the second tension control roll 133 can be 5-250N/m, and precision can be ± 1N/m.
Second carry-over pinch rolls 134 are arranged on below lithium band 210, close on Deviation rectifier 141 and correspondingly with the first carry-over pinch rolls 124 to arrange.Second carry-over pinch rolls 134 can be used for the second base material 230 guiding to enter Deviation rectifier 141.By arranging the first carry-over pinch rolls 124 and the second carry-over pinch rolls 134 near Deviation rectifier 141 place in the both sides of lithium band 210, first base material 220 and the second base material 230 can be imported to Deviation rectifier 141 from the both sides guiding lithium band 210 of lithium band 210, make the first base material 220 and the second base material 230 more uniformly, to be more entirely sticked in the both sides of lithium band 210.
As shown in Figure 2, Deviation rectifier 141 is arranged on the right side (when lithium band production equipment 100 is in position shown in Fig. 1) of rolling device 160 as feed side.Deviation rectifier 141 can be used for guaranteeing that the position that lithium band 210, first base material 220 and the second base material 230 keep certain enters in rolling device 160.Deviation rectifier 141 also can be used for guaranteeing that lithium band 210, first base material 220 enters in rolling device 160 with identical speed with the second base material 230.
Seal operation room 150 is for providing the work climate of whole equipment.In one embodiment, the humidity requirement 1%-50% in seal operation room 150, temperature requirement is between 10-35 °.
Rolling device 160 comprises cylinder 214, loading plate 215, working roll 216, pressure controller 211, speed control 212, clearance controller 213 and gap adjusting mechanism 217.
Wherein, cylinder 214 is for holding loading plate 215 and working roll 216, and the air pressure or hydraulic pressure for controlling loading plate 215 both sides makes loading plate 215 slide in cylinder 214 and move to predeterminated position.Cylinder 214 also for controlling the feedback to pressure, with prevent the first base material 220, second base material 230 and lithium band 210 pressure in nipping process excessive and cause roll gap to fluctuate.
Loading plate 215 comprises spaced first loading plate 215a and the second loading plate 215b.First loading plate 215a and the second loading plate 215b is slidably arranged in cylinder 214.The first loading plate 215a/ second loading plate 215b is made to slide in cylinder 214 and move to predeterminated position by the air pressure or hydraulic pressure regulating the first loading plate 215a/ second loading plate 215b both sides.
Working roll 216 can be used for carrying out roll-in to lithium band 210, first base material 220 and the second base material 230.In one embodiment, the roller footpath of working roll 216 can be 20-1000mm, and case hardness can be Rockwell hardness 60-100.The material of working roll 216 can be one or more combinations of the materials such as polyethylene, polypropylene, teflon, polyimides, Merlon, stainless steel, molybdenum.
Working roll 216 comprises spaced first working roll 216a and the second working roll 216b.First working roll 216a and the second working roll 216b is separately positioned on the first loading plate 215a and the second loading plate 215b by support 219, thus can move in cylinder 214 in company with the first loading plate 215a and/or the second loading plate 215b.By regulating air pressure or the hydraulic pressure of the first loading plate 215a/ second loading plate 215b both sides, the speed of the first loading plate 215a/ second loading plate 215b and the first working roll 216a/ second working roll 216b can be regulated separately.In one embodiment, the first working roll 216a and the speed of the second working roll 216b to charging lithium band 210 can control at 0.01-300m/min, and precision can be ± 0.01m/min.
Pressure controller 211 can be used for the pressure controlling working roll 216 pairs of charging lithium band 210, first base materials 220 and the second base material 220, and pressure control range can be 0.2-1.5MPa, and precision can be ± 0.01MPa.
Speed control 212 can be used for the speed controlling working roll 216 pairs of charging lithium bands 210, and the velocity interval of working roll 216 pairs of charging lithium bands 210 can be 0.01-300m/min, and precision can be ± 0.01m/min.
Clearance controller 213 can be used for the gap between control first working roll 216a and the second working roll 216b, and clearance control scope can be 0-1.5mm, and precision can be ± 0.001mm.
Gap adjusting mechanism 217 can be used for the gap between adjustment first working roll 216a and the second working roll 216b, is the feedback to clearance controller 213.
Film-removing device 170 is arranged on the left side (when lithium band production equipment 100 is in position shown in Fig. 1) of rolling device 160 as exit side.
Please continue see Fig. 2, film-removing device 170 comprises transfer roller 311, correction control roll 312, velocity test roller 313 and wind-up roll 314.When lithium band production equipment 100 is in position shown in Fig. 1, the correction of transfer roller 311, stripping control roll 312, stripping velocity test roller 313 and stripping wind-up roll 314 in the vertical direction are from up to down arranged at interval, and transfer roller 311 is positioned at the below of lithium band 210.
Wherein, transfer roller 311, for drawing the second base material 230 (hereinafter referred to as " the second base material 230 after stripping ") separated from lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230, makes the second base material 230 continue to peel off from lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230.In actual production process, when peeling off the second base material 230, the second base material 230 will apply active force to lithium band 210, and this active force makes lithium band 210 trend towards being separated with the first base material 220; The active force applied in order to the second base material 230 pairs of lithium bands 210 when reducing stripping the second base material 230 is separated with the first base material 220 to prevent lithium band 210, the second base material 230 after peeling off is drawn in transfer roller 311 can be less than 60 ° direction along the angle with horizontal direction, makes the second base material 230 continue to peel off from lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230.
In addition, in order to when reducing stripping the second base material 230 further, the second base material 230 is separated with the first base material 220 to prevent lithium band 210 impact of the active force that lithium band 210 applies, rolling device 160 can arrange built-in Deviation rectifier 221 in cylinder 214; Lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230 are after built-in Deviation rectifier 221, and the second base material 230 is peeled off and drawn by transfer roller 311 from lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230.By arranging Deviation rectifier 221, can reduce or eliminate the impact of strip operation on the rolling operation of rolling device 160.
Stripping correction control roll 312 can be used for correcting the delivering position of the second base material 230 in wrapup procedure after peeling off.In one embodiment, the moment of torsion control range of stripping correction control roll 312 can be 5-250N/m, and precision can be ± 1N/m.
Stripping velocity test roller 313 can be used for the gait of march of the second base material 230 after detection and control stripping.The speed control range of stripping velocity test roller 313 can be 0.01-300m/min, and precision can be ± 0.01m/min.
Stripping wind-up roll 314 can be used for the second base material 230 after to stripping and carries out rolling.In one embodiment, stripping wind-up roll 314 can stripping magnetic controller 3141 control under rolling, to guarantee that the second base material 230 after peeling off has certain tension force after stripping correction control roll 312 in wrapup procedure, thus guarantee that piling up or tensile phenomenon does not appear in the second base material 230 after peeling off in wrapup procedure.In one embodiment, the torque range of stripping magnetic controller 3141 can be 2-400N/m, and precision can be ± 1N/m.
On the direct of travel of lithium band 210, after passivating device 180 is positioned at film-removing device 170, namely lithium band 210 is first through film-removing device 170, then through passivating device 180.Passivating device 180 comprises passivation gas bottle 321, pulsometer 322, control assembly 323, gas pipeline 324 and gas nozzle 345.
Wherein, passivation gas bottle 321 can be used for supply and stores passivation gas.Passivation gas can be carbon dioxide or nitrogen dioxide.
Pulsometer 322 is sealedly attached between passivation gas bottle 321 and control assembly 323 by gas pipeline 324.Pulsometer 322 provides gases at high pressure for controlling passivation gas to the surface of lithium band 210 after peeling off.
Control assembly 323 is sealedly attached between pulsometer 322 and gas nozzle 345 by gas pipeline 324.After the inert gas in seal operation room 150 is full of, control assembly 323 closes pulsometer 322; When equipment needs maintenance down, control assembly 323 can close down the gas supply of passivation gas bottle 321.
Gas nozzle 345 is suspended from the below of lithium band 210 after stripping, with the surface of lithium band 210 after passivation stripping on surface passivation gas being sprayed on lithium band 210 after stripping, thus the surface of lithium band 210 forms passivating film after stripping, like this, lithium band 210 after calendering can Rapid deactivation behind disengaging stripping area, thus prevents lithium band 210 and air reaction.In one embodiment, passivation time can be 5-180s.
On the direct of travel of lithium band 210, after wrap-up 190 is positioned at passivating device 180, namely lithium band is first through passivating device 180, then through wrap-up 190.Wrap-up 190 comprises rolling speed control roll 331, rolling correction control roll 332 and wind-up roll 333.
Rolling speed control roll 331 can be used for the lithium band 210 containing individual layer first base material 220 after drawing passivation and advances, and keeps certain gait of march.In one embodiment, the speed control range of rolling speed control roll 331 can be 0.01-300m/min, and precision can be ± 0.01m/min.
Rolling correction control roll 332 is arranged between rolling speed control roll 331 and wind-up roll 333, for correcting the delivering position of lithium band 210 in wrapup procedure containing individual layer first base material 220.The moment of torsion control range of correction control roll 332 can be 5-250N/m, and precision can be ± 1N/m.
Wind-up roll 333 is for carrying out rolling to the lithium band 210 containing individual layer first base material 220.In one embodiment, wind-up roll 333 can control lower rolling by rolling magnetic controller 3331, to guarantee that the lithium band 210 containing individual layer first base material 220 has certain tension force after correction control roll 332 in wrapup procedure, thus guarantee that piling up or tensile phenomenon does not appear in the lithium band 210 containing individual layer first base material 220 in wrapup procedure.The torque range of rolling magnetic controller 3331 can be 2-400N/m, and precision can be ± 1N/m.
As mentioned above, lithium band production equipment 100 sets gradually lithium band unwinding device 110 on the direct of travel of lithium band 210, Deviation rectifier 141, rolling device 160, film-removing device 170, passivating device 180 and wrap-up 190 and the first unwinding device 120 and the second unwinding device 130 is set between lithium band unwinding device 110 and Deviation rectifier 141, by lithium band unwinding device 110, first unwinding device 120 and the second unwinding device 130 are respectively by lithium band 210, first base material 220 and the second base material 230 are transported to rolling device 160 through Deviation rectifier 141, and pass through the gap of dancer rools pressure device 160, the parameter such as pressure and speed obtains the lithium band 210 of respective thickness, and by film-removing device 170, second base material 230 is peeled off and rolling from lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230, afterwards, wrap-up 190 by the lithium band 210 after passivating device 180 processes and with the first base material 220 rolling that lithium band 210 bonds, complete the production process of lithium band 210.
After second base material 230 being peeled off from lithium band 210, first base material 220 pressed together by rolling device 160 and the second base material 230 by film-removing device 170, the side of lithium band 210 is surface exposed, make the lithium band 210 after rolling can be passivated device 180 Rapid deactivation behind disengaging stripping area, prevent lithium band 210 and air reaction, lithium band 210 can be preserved for a long time, and factory can be greatly reduced for the dependence of solid particle lithium powder and reduction production cost.
In addition, when utilizing rolling device 160 pairs of lithium bands 210 to carry out rolling operation, the both side surface of lithium band 210 is covered by the first base material 220 and the second base material 230 respectively, therefore, lithium band 210 does not directly contact with rolling device 160, thus can roll banding, not easily broken belt.In one embodiment of the invention, lithium band production equipment 100 can produce the metal lithium bands of the uniform 1-20 of thickness μm.In addition, the structure of lithium band production equipment 100 is simple, greatly can reduce costs, be conducive to suitability for industrialized production.
Above-mentioned is the concrete structure of lithium band production equipment 100 in one embodiment of the invention, and the using method of lithium band production equipment 100 is described with concrete example below.
Example 1
With reference to Fig. 1, open rolling device 160 switch, pressure controller 211 is adjusted to 0.8MPa, speed control 212 is adjusted to 30m/min, clearance adjuster 213 is adjusted to 0.02mm to utilize the parameter adjuster in rolling device 160 to arrange, and meets with the roller of small pieces lithium band 210, first base material 220 and the second base material 230 pairs of rolling devices 160 and carry out pre-test-run a machine; After Negotiation speed, gap, pressure fine setting obtain the thickness requirement 5 μm of the lithium band expected, powered-down.
Walk to wear lithium band 210 at the let off roll 111 of lithium band unwinding device 110, lithium tape speed control roll 112, lithium belt tension control roll tension control roll 113, simultaneously walk to wear the first base material 220 at the first let off roll 121 of the first unwinding device 120, First Speed control roll 122, first tension control roll 123, and walk to wear the second base material 230 at the let off roll 131 of the second unwinding device 130, velocity control roll 132, tension control roll 133.Afterwards, lithium band 210, first base material 220 and the second base material 230 are passed Deviation rectifier 141, and lithium band 210, first base material 220 and the second base material 230 are passed the roll gap of rolling device 160 again; The second base material 230 after stripping, through transfer roller 311, stripping velocity control roll 312, stripping tension control roll 313, arrives stripping wind-up roll 314; Treat that volume lithium band 210 arrives follow-up wind-up roll 333 by threading containing individual layer first base material 220, treat that volume lithium band 210 is fixed on material receiving roller 333 the most at last containing individual layer first base material 220.
The air pressure regulating inert gas is 0.5MPa, the state of debugging before the parameter of rolling device 160 is adjusted back to, and velocity control roll 112,122,132,312,331 and working roll 216 are adjusted to 30m/min, and tension control roll 113,123,133,313,332 is adjusted to 10N/m.Now, press the start button of lithium band production equipment 100, the required lithium band 210 of 5 μm can be obtained by rolling, and the surface of lithium band 210 obtains passivation preferably, can preserve the long period, can avoid reacting with air.
Example 2
With reference to Fig. 1, open rolling device 160 switch, pressure controller 211 is adjusted to 0.6MPa, speed control 212 is adjusted to 15m/min, clearance adjuster 213 to 0.04mm, and meets with the roller of small pieces lithium band 210, first base material 220 and the second base material 230 pairs of rolling devices 160 and carries out pre-test-run a machine to utilize the parameter adjuster in rolling device 160 to arrange; After Negotiation speed, gap, pressure fine setting obtain the thickness requirement 5 μm of the lithium band 210 expected, powered-down.
Walk to wear lithium band 210 at the let off roll 111 of lithium band unwinding device 110, lithium tape speed control roll 112, lithium belt tension control roll tension control roll 113, simultaneously walk to wear the first base material 220 at the first let off roll 121 of the first unwinding device 120, First Speed control roll 122, first tension control roll 123, and walk to wear the second base material 230 at the let off roll 131 of the second unwinding device 130, velocity control roll 132, tension control roll 133.Afterwards, lithium band 210, first base material 220 and the second base material 230 are passed Deviation rectifier 141, and lithium band 210, first base material 220 and the second base material 230 are passed the roll gap of rolling device 160 again; The second base material 230 after stripping, through transfer roller 311, stripping velocity control roll 312, stripping tension control roll 313, arrives stripping wind-up roll 314; Treat that volume lithium band 210 arrives follow-up wind-up roll 333 by threading containing individual layer first base material 220, treat that volume lithium band 210 is fixed on material receiving roller 333 the most at last containing individual layer first base material 220.
The air pressure regulating inert gas is 0.5MPa, the state of debugging before the parameter of rolling device 160 is adjusted back to, and velocity control roll 112,122,132,312,331 and working roll 216 are adjusted to 15m/min, and control roll 113,123,133,313,332 of being rectified a deviation by tension force is adjusted to 5N/m.Now, press the start button of lithium band production equipment 100, the required lithium band of 10 μm can be obtained by rolling, and the surface of lithium band 210 obtains passivation preferably, can preserve the long period, can avoid reacting with air.
Fig. 3 is the schematic flow sheet of lithium band production method in one embodiment of the invention.In one embodiment, this lithium band production method can adopt above-mentioned lithium band process units 100 to implement.As shown in Figure 3, lithium band production method comprises:
S100, selects materials: reject surperficial defective lithium band, selects qualified lithium band to be rolled;
S200, in advance passivation: described lithium band to be rolled is placed in drying shed, passivation gas be sprayed on surface that described lithium band to be rolled exposes and carry out Passivation Treatment, passivation time is 5-20 hour;
S300, surface treatment: respectively surface treatment is carried out to the surface that described first base material and described second base material contact with described lithium band to be rolled and make the absorption affinity between described first base material and described lithium band to be rolled be greater than absorption affinity between described second base material and described lithium band to be rolled;
S400, roll-in: lithium band to be rolled, the first base material and the second substrate layer are stacked and puts and carry out roll-in, three is pressed together, wherein, described lithium band to be rolled is placed between described first base material and the second base material, and the both sides of described lithium band to be rolled are covered completely by described first base material and described second base material respectively;
S500, peels off: peeled off from the lithium band pressed together by described rolling device, described first base material and described second base material by described second base material;
S600, passivation: Passivation Treatment is carried out to the surface of described qualified lithium band to be rolled;
S700, rolling: by the lithium band rolling containing described first base material.
Wherein, the step of selecting materials in S100 specifically can comprise: utilize microscope or magnifying glass to observe the surface of lithium band, reject the lithium band containing impurity, bubble, thus pick out qualified lithium band to be rolled.
In one embodiment, the thickness range of the lithium band in S100 can be 30-1000 μm, and the thickness range of namely qualified lithium band to be rolled can be 30-1000 μm.
Step S200 can make the hardness of lithium band entirety reach required soft durometer, and lithium band to be rolled can be prevented oxidized before roll-in, can preserve the long period.In one embodiment, qualified treating can be carried out Passivation Treatment in the inactivating case that roll extrusion roll-in lithium band is placed in drying shed.The passivation time preferred time is 5-8h, and passivation time is shorter, and the lithium belt surface after roll-in easily occurs oxidative phenomena, and passivation time is longer, then may affect the production capacity of equipment.
In S300, the first base material and the second base material can be one or both combinations in high-molecular diaphragm, metallic membrane and inorganic material diaphragm.In one embodiment, the thickness of the first base material and the second base material can between 1-3000 μm.First base material and the second base material can adopt one or more the combination in Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene (PTFE), polyarylsulfone (PAS), PETG, acrylonitrile-butadiene-styrene copolymer, polyimides, polyether sulfone, Copper Foil, aluminium foil, non-woven fabrics, Ge Laxin paper or fibre paper to make respectively.And preferably acrylonitrile-butadiene-styrene copolymer, polyimides, PETG, its material has larger hot strength and good elastic deformation, can play good cushioning and protection for lithium band to be rolled.
In S300, respectively surface treatment is carried out to the surface that the first base material and the second base material contact with lithium band to be rolled and specifically comprises:
Respectively octadecane is coated with to the surface that the first base material and the second base material contact with lithium band to be rolled, hexadecane, cyclohexane, kerosene, dimethicone, edible oil, dimethyl carbonate, trifluoro propyl methyl cyclotrisiloxane, dichloroethanes, HMDO, one or more combinations of the materials such as ring five dimethyl silicone polymer, the roughness on the surface that lithium band on the first base material with to be rolled is contacted is less than the roughness on the surface that lithium band on the second base material with to be rolled contacts, thus make the absorption affinity between the first base material and lithium band to be rolled be greater than absorption affinity between the second base material and lithium band to be rolled.Like this, peel off in the second base material process in S500, the first base material can attach with lithium band, and the second base material can be peeled off and not sticky lithium band from lithium band.Wherein, preferred material is dimethicone, ring five dimethyl silicone polymer, and its material can form fine and close separating layer at the first base material and the second substrate surface, ensure that calendering lithium band can better be peeled off, this material can form different surfaces adhesive force at substrate surface simultaneously.
Before carrying out S400, can heating-up temperature, pressure, the kinematic parameter such as gap and speed of dancer rools pressure device in advance;
Heating temperature range is less than 120 DEG C, and heating-up temperature is too high, easily causes the first base material and the second base material to produce distortion, and then causes the first base material and the second base material to occur crumpling and breakage in nipping process.Further, temperature should not lower than 35 DEG C, if heating-up temperature is too low, then lithium band to be rolled may not produce good extension, does not reach the thickness requirement of expection.
Can according to the pressure of the thickness adjustment working roll of the lithium band of desired thickness, speed and gap.Wherein, the pressure of working roll can regulate between 0.2 ~ 1.5MPa, and the pressure preferable range of working roll is 0.4-1.0MPa, and working roll pressure is excessive, easily cause the first base material and the second base material to produce to crush, and then cause lithium band to be rolled to occur fire risk in nipping process; And if working roll pressure is too small, then lithium band to be rolled may not reach the thickness requirement of expection in nipping process.The speed of working roll can regulate between 0.001-60m/min, and preferred working roll speed is 1-30m/min, working roll excessive velocities, can cause lithium band to be rolled in nipping process, occur not reaching the thickness requirement of expection; Working roll speed is excessively slow, then lithium band to be rolled can be caused again to occur not reaching capacity requirements in nipping process.Gap between working roll can regulate between 0-5mm.Wherein, preferred working roll gap is 0.01-0.5mm, and working roll gap is too small, easily cause described first base material and described second base material crushed in nipping process, and then cause described lithium band to be rolled to occur fire risk in nipping process; Working roll excesssive gap, described lithium band to be rolled does not reach the thickness requirement of expection in nipping process.
In actual production process, two working rolls can constant speed roll-in, also can differential roll-in.
When two working rolls adopt constant speed roll-in, the speed of two working rolls is identical, can be 0.001-60m/min, is preferably 0.1-30m/min.
When two working rolls adopt differential roll-in, the speed of the working roll that two working roll medium velocities are slow and the velocity ratio of fireballing working roll are between 0.3%-100%, favor speed is than between 5%-30%, if the velocity ratio of double-working is too small, then may cause lithium band to be rolled in nipping process, occur discontinuous outward appearance; And if the velocity ratio of double-working is excessive, then may cause again lithium band to be rolled in nipping process, do not reach the thickness requirement of expection.By the coupling of friction speed between two roll-in rollers, the lithium amount of eating when can guarantee lithium band pan feeding can not promote along with speed and increase, and can guarantee production efficiency simultaneously.
The effect of S600 is, after being peeled off by the second base material, the lithium band surface of exposing can form passivating film, and so, the lithium band after calendering can Rapid deactivation after peeling off the second base material, thus prevents lithium band and air reaction.In one embodiment, the passivation time in S600 can be 5-180s.
In one embodiment, institute can be 10-35 DEG C in environment temperature in steps, and humidity is carry out under the condition of 0-20%, so that carry out roll operation to lithium band.
Can be produced the lithium band of not roll banding, not broken belt by above-mentioned lithium band production method, the thickness range of lithium band between 1-20 μm, can be applicable to the thickness of multiple ultra-thin lithium cell, thus meets the demand of battery enterprise; And production process environmental pollution is less, there is not potential safety hazard.
With concrete example, lithium band production method is described below.
Example 3
Utilize low-powered microscope to observe the lithium band that supplied materials 45 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band to be rolled is placed in environment temperature 30 DEG C, carries out Passivation Treatment under the environment of humidity 10%, passivation time 8h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, wide the first base material for 75mm and the second base material, and dimethicone is coated with to the first base material and the second substrate surface.Wherein, the material of the first base material is polyethylene, the material of the second base material is Ge Laxin paper, working roll is heated, make the temperature of working roll reach 80 DEG C, the speed of the first working roll is adjusted to 3m/min, the speed of the second working roll is adjusted to 30m/min, gap adjustment between two working rolls is 5 μm, and air pressure controls as 0.6MPa.Long 32mm, lithium band that wide 70mm passivation is good to be placed between the first base material and the second base material and to be sent between mill rolls and complete the operation of rolling, the lithium band of 5 μm can be obtained, adhesive force between first base material and lithium band is 0.12N, and the adhesive force between the second base material and lithium band is 0.038N.
Example 4
Utilize low-powered microscope to observe the lithium band that supplied materials 100 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 25 DEG C, under the environment of humidity 2%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, the first base material that the wide two panels polyimides macromolecular material for 75mm is made and the second base material, and cyclohexane is coated with to the first base material and the second substrate surface.Heat working roll, make the temperature of working roll reach 80 DEG C, the speed of the first working roll is adjusted to 3m/min, the speed of the second working roll is adjusted to 3m/min, the gap adjustment between two working rolls is 3 μm, and air pressure controls as 0.65MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between mill rolls by long, the lithium band of 3 μm can be obtained, adhesive force between first base material and lithium band is 0.08N, and the adhesive force between the second base material and lithium band is 0.051N.
Example 5
Utilize low-powered microscope to observe the lithium band that supplied materials 45 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band to be rolled is placed in environment temperature 30 DEG C, carries out Passivation Treatment under the environment of humidity 10%, passivation time 8h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, wide the first base material for 75mm and the second base material, and at the surperficial coating surface material of the first base material and the second base material.Wherein, the material of the first base material is acrylonitrile-butadiene-styrene copolymer, and coated surfacing is dimethicone; The material of the second base material is PETG, and coated surfacing is acrylic polysiloxane.Heat working roll, make the temperature of working roll reach 85 DEG C, the speed of the first working roll is adjusted to 5m/min, the speed of the second working roll is adjusted to 5m/min, the gap adjustment between two working rolls is 10 μm, and air pressure controls as 0.6MPa.Long 32mm, lithium band that wide 70mm passivation is good to be placed between the first base material and the second base material and to be sent between mill rolls and complete the operation of rolling, the lithium band of 10 μm can be obtained, adhesive force between first base material and lithium band is 0.15N, and the adhesive force between the second base material and lithium band is 0.045N.
Example 6
Utilize low-powered microscope to observe the lithium band that supplied materials 250 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 27 DEG C, under the environment of humidity 1%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, the first base material that the wide two frame Racine paper for 75mm are made and the second base material, and HMDO is coated with to the first base material and the second substrate surface.Heat working roll, make the temperature of working roll reach 35 DEG C, the speed of working roll being at a slow speed adjusted to 10m/min, and the speed of rapid operation roller is adjusted to 10m/min, is 20 μm by the gap adjustment between two working rolls, and air pressure controls as 0.45MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between working roll by long, the lithium band of 20 μm can be obtained, adhesive force between first base material and lithium band is 0.07N, and the adhesive force between the second base material and lithium band is 0.055N.
Example 7
Utilize low-powered microscope to observe the lithium band that supplied materials 250 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 27 DEG C, under the environment of humidity 1%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, the first base material that the wide two panels PETG for 75mm is made and the second base material, and to the first substrate surface coating dimethicone, octadecane is coated with to the second substrate surface.Heat working roll, make the temperature of working roll reach 48 DEG C, the speed of working roll being at a slow speed adjusted to 1.5m/min, and the speed of rapid operation roller is adjusted to 20m/min, is 15 μm by the gap adjustment between two working rolls, and air pressure controls as 0.45MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between working roll by long, the lithium band of 15 μm can be obtained, adhesive force between first base material and lithium band is 0.085N, and the adhesive force between the second base material and lithium band is 0.032N.
Example 8
Utilize low-powered microscope to observe the lithium band that supplied materials 100 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 25 DEG C, under the environment of humidity 2%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, wide the first base material for 75mm and the second base material, and at the surperficial coating surface material of the first base material and the second base material.Wherein, the material of the first base material is polyurethane, and coated surfacing is hexadecane; The material of the second base material is polyether sulfone, and coated surfacing is ring five dimethyl silicone polymer.Heat working roll, make the temperature of working roll reach 60 DEG C, the speed of working roll being at a slow speed adjusted to 3m/min, and the speed of rapid operation roller is adjusted to 30m/min, is 15 μm by the gap adjustment between two working rolls, and air pressure controls as 0.2MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between working roll by long, the lithium band of 15 μm can be obtained, adhesive force between first base material and lithium band is 0.09N, and the adhesive force between the second base material and lithium band is 0.043N.
Example 9
Utilize low-powered microscope to observe the lithium band that supplied materials 100 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 25 DEG C, under the environment of humidity 2%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, wide the first base material for 75mm and the second base material, and at the surperficial coating surface material of the first base material and the second base material.Wherein, the material of the first base material is PETG, and coated surfacing is hexadecane; The material of the second base material is Ge Laxin paper, and coated surfacing is dimethicone.Heat working roll, make the temperature of working roll reach 90 DEG C, the speed of working roll being at a slow speed adjusted to 15m/min, and the speed of rapid operation roller is adjusted to 60m/min, is 15 μm by the gap adjustment between two working rolls, and air pressure controls as 0.8MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between working roll by long, the lithium band of 15 μm can be obtained, adhesive force between first base material and lithium band is 0.093N, and the adhesive force between the second base material and lithium band is 0.042N.
Example 10
Utilize low-powered microscope to observe the lithium band that supplied materials 250 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 27 DEG C, under the environment of humidity 1%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, wide the first base material for 75mm and the second base material, and at the surperficial coating surface material of the first base material and the second base material.Wherein, the material of the first base material is Ge Laxin paper, and coated surfacing is dimethicone; The material of the second base material is PETG, and coated surfacing is acrylic polysiloxane.Heat working roll, make the temperature of working roll reach 100 DEG C, the speed of working roll being at a slow speed adjusted to 0.001m/min, and the speed of rapid operation roller is adjusted to 3m/min, is 10 μm by the gap adjustment between two working rolls, and air pressure controls as 1.0MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between working roll by long, the lithium band of 10 μm can be obtained, adhesive force between first base material and lithium band is 0.082N, and the adhesive force between the second base material and lithium band is 0.063N.
Example 11
Utilize low-powered microscope to observe the lithium band that supplied materials 100 μm is thick, reject the position of surface containing impurity, afterwards qualified lithium band is placed in environment temperature 25 DEG C, under the environment of humidity 2%, carries out Passivation Treatment, passivation time 4h.By the soft durometer that Passivation Treatment can make lithium band reach unified.Get out long 500mm, wide the first base material for 75mm and the second base material, and at the surperficial coating surface material of the first base material and the second base material.Wherein, the material of the first base material is polyimides, and coated surfacing is cyclohexane; The material of the second base material is PETG, and coated surfacing is HMDO.Heat working roll, make the temperature of working roll reach 110 DEG C, the speed of the first working roll is adjusted to 0.01m/min, the speed of the second working roll is adjusted to 5m/min, the gap adjustment between two working rolls is 7 μm, and air pressure controls as 1.5MPa.The operation of rolling is completed for 32mm, the wide lithium band good for 70mm passivation to be placed between the first base material and the second base material and to be sent between mill rolls by long, the lithium band of 7 μm can be obtained, adhesive force between first base material and lithium band is 0.11N, and the adhesive force between the second base material and lithium band is 0.071N.
In the above-described embodiments, lithium band can be metal lithium bands or lithium metal alloy band.
The lithium tape thickness of example made by 3-11 is all within 20 μm, and the gap of the adhesive force ubiquity 1-3 between the first base material and the second base material times of left and right, the stripping process of the second base material will be very smooth and easy.
In sum, the lithium band production equipment 100 in the embodiment of the present invention and lithium band production method can have following beneficial effect:
1) the lithium band process units in the embodiment of the present invention and method can select the first suitable base material and the second base material according to technological requirement, the continuous seepage of 1-20 μm of lithium band can be realized, do not occur the phenomenon of roll banding, broken belt, convenient and simple for operation, practicality is wide;
2) the lithium band production method in the embodiment of the present invention carries out surface treatment as coating octadecane etc. to the first base material, the second substrate surface, can make the surface of the first base material and the second base material in nipping process, realize different lubricant effects, can guarantee that the lithium band that roll-in goes out can be peeled off with the second base material well and guarantee that the lithium band that roll-in goes out and the first base material attach simultaneously;
3) the lithium band production method in the embodiment of the present invention is by rolling process and carry out surface treatment such as coating octadecane etc. i.e. lubricating process to the first base material, the second substrate surface and combine together, can by lithium band thicker for supplied materials roll-in together with the first base material, the second base material, Passivation Treatment is carried out on the surface that after peeling off the second base material afterwards, lithium band exposes, to form one deck passivating film at lithium belt surface, prevent lithium band and air from reacting, the lithium band directly rolling in atmosphere after rolling can be realized;
3) the lithium band production method in the embodiment of the present invention is by the speed of adjustment two working rolls, make the coupling realizing friction speed between two working rolls, the base material of side is as comparatively slow in the first base material or the second base material pan feeding, effectively can reduce the use cost of base material; By the coupling of friction speed between two working rolls, the lithium amount of eating when can guarantee lithium band pan feeding can not promote along with speed and increase, and can guarantee production efficiency simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a lithium band production method, is characterized in that, comprises following raw materials: the first base material, the second base material and lithium band to be rolled, comprise the following steps:
Roll-in: described first base material, described lithium band to be rolled and described second base material are stacked gradually and places and carry out roll-in by rolling device, three is pressed together, wherein, the both sides of described lithium band to be rolled are covered completely by described first base material and described second base material respectively;
Peel off: described second base material is peeled off from the lithium band pressed together by described rolling device, described first base material and described second base material.
2. lithium band production method according to claim 1, is characterized in that, also comprised before the step of described roll-in: regulate the heating-up temperature of described rolling device, pressure, gap and speed, specifically comprise:
Heat for two of roll-in working rolls in described rolling device, the heating-up temperature of described working roll regulates between 35-120 DEG C;
The pressure of described working roll is regulated between 0.2 ~ 1.5MPa;
Gap between described working roll is regulated between 0-5mm;
The speed of described working roll is regulated between 0.001-60m/min.
3. lithium band production method according to claim 2, is characterized in that, the described speed of described working roll adjustment between 0.001-60m/min comprises further:
The speed of working roll slow for two described working roll medium velocities and the speed ratio of fireballing working roll are controlled between 0.3%-100%.
4. lithium band production method according to claim 3, is characterized in that, the speed of the working roll that described two working roll medium velocities are slow and the speed ratio of fireballing working roll control between 5%-30%.
5. lithium band production method according to claim 1, is characterized in that,
Described first base material is high-molecular diaphragm, metallic membrane or inorganic material diaphragm;
And/or
Described second base material is high-molecular diaphragm, metallic membrane or inorganic material diaphragm.
6. lithium band production method according to claim 5, it is characterized in that, described first base material and described second base material adopt one or more the combination in Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene (PTFE), polyarylsulfone (PAS) polyethylene terephthalate ether, acrylonitrile-butadiene-styrene copolymer, polyimides or polyether sulfone to make respectively.
7. lithium band production method according to claim 1, is characterized in that, also comprised the following steps: before the step of described roll-in
Surface treatment: respectively surface treatment is carried out to the surface that described first base material and described second base material contact with described lithium band to be rolled and make the absorption affinity between described first base material and described lithium band to be rolled be greater than absorption affinity between described second base material and described lithium band to be rolled.
8. lithium band production method according to claim 7, is characterized in that, also comprises before described surface-treated step:
Passivation in advance: be placed in drying shed by described lithium band to be rolled, passivation gas be sprayed on surface that described lithium band to be rolled exposes and carry out Passivation Treatment, passivation time is 5-20 hour.
9. lithium band production method according to claim 1, is characterized in that, also comprise after the step of described stripping;
Passivation: Passivation Treatment is carried out to the surface that described lithium band exposes.
10. lithium band production method according to claim 9, is characterized in that, also comprise after the step of described passivation:
Rolling: by the lithium band rolling containing described first base material.
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| CN201510211694.8A CN104842626A (en) | 2015-04-29 | 2015-04-29 | Lithium strip production method |
| PCT/CN2015/085950 WO2016173137A1 (en) | 2015-04-29 | 2015-08-03 | Lithium strip manufacturing method |
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| WO2021022997A1 (en) * | 2019-08-02 | 2021-02-11 | 宁德时代新能源科技股份有限公司 | Lithium strip and lithium strip coil having same |
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