WO2016173137A1 - 锂带生产方法 - Google Patents

锂带生产方法 Download PDF

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Publication number
WO2016173137A1
WO2016173137A1 PCT/CN2015/085950 CN2015085950W WO2016173137A1 WO 2016173137 A1 WO2016173137 A1 WO 2016173137A1 CN 2015085950 W CN2015085950 W CN 2015085950W WO 2016173137 A1 WO2016173137 A1 WO 2016173137A1
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WO
WIPO (PCT)
Prior art keywords
substrate
lithium
strip
lithium strip
speed
Prior art date
Application number
PCT/CN2015/085950
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English (en)
French (fr)
Inventor
李旭东
陶兴华
谢斌
张盛武
程文强
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2016173137A1 publication Critical patent/WO2016173137A1/zh

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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
    • 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

Definitions

  • the invention relates to the field of lithium ion batteries, and in particular to a method for producing lithium strips.
  • Lithium is known as the "Energy Star” by scientists, and the two batteries with lithium as the negative active material have unparalleled advantages.
  • Due to the active chemical nature of lithium it is easy to react with oxygen, nitrogen, moisture, etc. in the air at normal temperature, so the processing of battery-grade lithium strips faces higher challenges.
  • battery-grade lithium ribbons are prone to sticking during production, resulting in broken tape.
  • the present invention provides a lithium tape production method
  • a first substrate a second substrate, and a lithium strip to be rolled, including the following steps:
  • the first substrate, the lithium strip to be rolled, and the second substrate are sequentially stacked and rolled by a rolling device to press the three together, wherein the Two sides of the rolled lithium strip are completely covered by the first substrate and the second substrate, respectively;
  • the second substrate is peeled off from the lithium tape, the first substrate, and the second substrate that are pressed together by the rolling device.
  • Heating the two work rolls for rolling in the rolling device the heating temperature of the work rolls being adjusted between 35-120 ° C;
  • the speed of the work rolls was adjusted between 0.001 and 60 m/min.
  • the adjusting the speed of the work roll between 0.001-60 m/min further comprises:
  • the ratio of the speed of the slow working rolls of the two work rolls to the speed of the fast working rolls is controlled between 0.3% and 100%.
  • the speed of the slow working roller and the speed of the fast working roller of the two work rolls are controlled between 5% and 30%.
  • the first substrate is a polymer film, a metal film or an inorganic material film
  • the second substrate is a polymer film, a metal film or an inorganic material film.
  • first substrate and the second substrate are respectively Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyarylsulfone, polyethylene terephthalate, propylene A combination of one or more of a nitrile-butadiene-styrene copolymer, a polyimide, or a polyether sulfone.
  • the method further comprises the following steps:
  • Surface treatment surface treating the surface of the first substrate and the second substrate that is in contact with the lithium strip to be rolled, respectively, such that the first substrate and the lithium strip to be rolled are The adsorption force is greater than the adsorption force between the second substrate and the lithium strip to be rolled.
  • the method further includes:
  • Pre-passivation the lithium strip to be rolled is placed in a dry room, and a passivation gas is sprayed on the exposed surface of the lithium strip to be passivated for passivation treatment, and the passivation time is 5-20 hours.
  • step of stripping further comprising;
  • Passivation passivation of the exposed surface of the lithium strip.
  • the method further comprises:
  • Winding The lithium tape containing the first substrate is wound up.
  • the lithium strip production method in the embodiment of the present invention can ensure the lithium strip production process by adopting the first substrate, the second substrate and the lithium strip to be rolled, and then peeling the second substrate. Keep belting and not bonding.
  • FIG. 1 is a schematic structural view of a lithium belt production apparatus according to an embodiment of the present invention.
  • FIG. 2 is a schematic view showing the fitting structure of a rolling device, a peeling device, and a passivation device according to an embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a method for producing a lithium strip according to an embodiment of the present invention.
  • the lithium tape production apparatus 100 includes a lithium tape unwinding device 110, a first unwinding device 120, a second unwinding device 130, a corrector 141, a sealing working chamber 150, a rolling device 160, and a film stripping device.
  • the lithium strip 210, the first substrate 220 and the second substrate 230 respectively transported by the lithium strip unwinding device 110, the first unwinding device 120 and the second unwinding device 130 are passed through the corrector 141 to be installed in the sealing work.
  • the lithium tape unwinding device 110 includes a lithium tape unwinding roller 111, a lithium tape speed test roller 112, and a lithium tape tension control roller 113.
  • the lithium tape unwinding roller 111 is used to mount the lithium tape 210 to be processed.
  • the treated lithium strip 210 may have a thickness in the range of 0.040-1500 mm.
  • the lithium tape unwinding roller 111 can unwind the lithium tape 210 under the control of the lithium ribbon magnetic powder controller 1111 to ensure that the lithium tape 210 maintains a certain tension during unwinding.
  • the magnetic powder controller 1111 can have a torque range of 2-400 N/m and an accuracy of ⁇ 1 N/m.
  • the lithium tape speed test roll 112 is disposed between the lithium tape unwinding roll 111 and the lithium tape tension control roll 113.
  • the unwinding roller 111, the lithium tape speed detecting roller 112, and the lithium tape tension controlling roller 113 are spaced apart in the vertical direction, and the lithium tape speed detecting roller 112 is located in the lithium ribbon.
  • the lithium tape speed test roll 112 can be used to test and control the speed at which the lithium tape 210 is unwound to ensure that the speed of the lithium tape 210 before feeding is in accordance with the tension requirements of the lithium tape unwinding roll 111 and the lithium tape tension control roll 113.
  • the speed test roll 112 may have a speed in the range of 0.01-300 m/min and an accuracy of ⁇ 0.01 m/min.
  • the tension control roller 113 can be used to ensure that the lithium tape 210 maintains a straight feed during transport without the lithium strip 210 being deposited or broken.
  • the tension control roller 113 can also be used to adjust the amount of tension of the lithium tape 210 during unwinding.
  • the tension control roller 113 may have a torque control range of 5 to 250 N/m and an accuracy of ⁇ 1 N/m.
  • the first unwinding device 120 is disposed between the lithium tape unwinding device 110 and the corrector 141.
  • the first unwinding device 120 includes a first unwinding roller 121, a first speed detecting roller 122, a first tension controlling roller 123, and a first pulling roller 124.
  • the first unwinding roller 121, the first speed detecting roller 122, the first tension controlling roller 123, and the first pulling roller 124 are vertically upward and downward.
  • the spacing is set and the first traction roller 124 is located above the lithium strip 210.
  • the first unwinding roller 121 is used to mount the first substrate 220.
  • the material of the first substrate 220 cannot react with the lithium ribbon 210.
  • the thickness of the first substrate 220 may range from 1 to 3000 ⁇ m.
  • the material of the first substrate 220 may be Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyarylsulfone polyethylene terephthalate, acrylonitrile-butyl
  • the first unwinding roller 121 can unwind the first substrate 220 under the control of the first magnetic powder controller 1211 to ensure that the first substrate 220 maintains a certain tension during the unwinding process.
  • the first magnetic powder controller 1211 may have a torque range of 2-400 N/m and an accuracy of ⁇ 1 N/m.
  • the first speed test roll 122 is disposed between the first unwinding roll 121 and the first tension control roll 123.
  • the first speed test roll 122 can be used to test and control the speed at which the first substrate 220 is unwound to ensure that the speed of the first substrate 220 prior to feeding conforms to the tension of the first unwinding roll 121 and the first tension control roll 123. Claim.
  • the speed of the first speed test roll 122 may range from 0.01 to 300 m/min and the accuracy may be ⁇ 0.01 m/min.
  • the first tension control roller 123 can be used to ensure that the first substrate 220 maintains a linear feed during transport without the first substrate 220 being deposited or deformed.
  • the first tension control roller 123 can also be used to adjust the amount of tension of the first substrate 220 during unwinding.
  • the first tension control The torque control of the roller 123 may range from 5 to 250 N/m and the accuracy may be ⁇ 1 N/m.
  • the first traction roller 124 is disposed above the lithium strip 210 and adjacent to the corrector 141.
  • the traction roller 124 can be used to guide the first substrate 220 into the corrector 141.
  • the second unwinding device 130 is disposed between the lithium tape unwinding device 110 and the correcting device 141, and is located on both sides of the lithium strip 210 or the correcting device 141 with the first unwinding device 120.
  • the second unwinding device 130 is located below the lithium strip 210 or the correcting 141, and the first unwinding device 120 is located above the lithium strip 210 or the correcting 141, ie
  • the first unwinding device 120 and the second unwinding device 130 are located on both sides of the lithium strip 210 or the correcting 141 in the vertical direction.
  • the second unwinding device 130 includes a second unwinding roller 131, a second speed detecting roller 132, a second tension controlling roller 133, and a second pulling roller 134.
  • the second unwinding roller 131 is used to mount the second substrate 230.
  • the material of the second substrate 230 cannot react with the lithium ribbon 210.
  • the thickness of the second substrate 230 may range from 1 to 3000 ⁇ m.
  • the material of the second substrate 230 may be Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyarylsulfone polyethylene terephthalate, acrylonitrile-butyl
  • the copolymer and the polyimide have large tensile strength and good elastic deformation, and can better buffer and protect the lithium strip to be rolled.
  • the second unwinding roller 131 can unwind the second substrate 230 under the control of the second magnetic powder controller 1311 to ensure that the second substrate 230 maintains a certain tension during the unwinding process.
  • the magnetic powder controller 1311 can have a torque range of 2-400 N/m and an accuracy of ⁇ 1 N/m.
  • the second speed test roller 132 is disposed between the second unwinding roller 131 and the second tension control roller 133.
  • the second speed test roll 132 can be used to test and control the speed at which the second substrate 230 is unwound to ensure that the speed of the second substrate 230 prior to feeding conforms to the tension of the second unwinding roll 131 and the second tension control roll 133.
  • the speed of the second speed test roll 122 may range from 0.01 to 300 m/min and the accuracy may be ⁇ 0.01 m/min.
  • the second tension control roller 133 can be used to ensure that the second substrate 230 maintains a straight feed during transport without the second substrate 230 being deposited or deformed.
  • the second tension control roller 133 can also be used to adjust the amount of tension of the second substrate 230 during unwinding.
  • the second tension control roller 133 may have a torque control range of 5 to 250 N/m and an accuracy of ⁇ 1 N/m.
  • the second pulling roller 134 is disposed under the lithium strip 210, adjacent to the corrector 141 and disposed corresponding to the first pulling roller 124.
  • the second traction roller 134 can be used to guide the second substrate 230 into the corrector 141.
  • the first substrate 220 and the second substrate 230 can be guided from both sides of the lithium strip 210 to the lithium strip 210 by providing the first pulling roller 124 and the second pulling roller 134 at both sides of the lithium strip 210 near the corrector 141. And introduced into the corrector 141, so that the first substrate 220 and the second substrate 230 can be attached to both sides of the lithium strip 210 more uniformly and evenly.
  • the corrector 141 is disposed on the right side of the rolling device 160 (when the lithium ribbon producing apparatus 100 is in the position shown in FIG. 1) such as the feeding side.
  • the corrector 141 can be used to ensure that the lithium strip 210, the first substrate 220, and the second substrate 230 remain in a certain position into the rolling device 160.
  • the corrector 141 can also be used to ensure that the lithium strip 210, the first substrate 220, and the second substrate 230 enter the rolling device 160 at the same speed.
  • the sealing working chamber 150 is used to provide a working atmosphere for the entire device.
  • the humidity in the sealing chamber 150 is required to be between 1% and 50% and the temperature is required to be between 10 and 35 degrees.
  • the rolling device 160 includes a cylinder 214, a carrier plate 215, a work roll 216, a pressure controller 211, a speed controller 212, a gap controller 213, and a gap adjustment mechanism 217.
  • the cylinder 214 is used to accommodate the carrier plate 215 and the work roll 216, and is used to control the air pressure or hydraulic pressure on both sides of the carrier plate 215 such that the carrier plate 215 slides in the cylinder 214 and moves to a preset position.
  • the cylinder 214 is also used to control feedback to the pressure to prevent the first substrate 220, the second substrate 230, and the lithium strip 210 from being subjected to excessive pressure during rolling, resulting in nip fluctuations.
  • the carrier plate 215 includes a first carrier plate 215a and a second carrier plate 215b that are spaced apart.
  • the first carrier plate 215a and the second carrier plate 215b are slidably disposed in the cylinder 214.
  • the first carrier plate 215a/ is adjusted by adjusting the air pressure or hydraulic pressure on both sides of the first carrier plate 215a / the second carrier plate 215b.
  • the second carrier plate 215b slides in the cylinder 214 and moves to a preset position.
  • the work roll 216 can be used to roll the lithium strip 210, the first substrate 220, and the second substrate 230.
  • the work roll 216 may have a roll diameter of 20-1000 mm and a surface hardness of 60-100 Rockwell hardness.
  • the material of the work roll 216 may be one or more combinations of materials such as polyethylene, polypropylene, Teflon, polyimide, polycarbonate, stainless steel, molybdenum, and the like.
  • the work roll 216 includes a first work roll 216a and a second work roll 216b that are spaced apart.
  • the first work roll 216a and the second work roll 216b may be respectively disposed on the first carrier plate 215a and the second carrier plate 215b via the bracket 219 so as to be in the cylinder 214 along with the first carrier plate 215a and/or the second carrier plate 215b.
  • the speed of the first carrier plate 215a / the second carrier plate 215b and the first work roll 216a / the second work roll 216b can be individually adjusted by adjusting the air pressure or hydraulic pressure on both sides of the first carrier plate 215a / the second carrier plate 215b.
  • the speed of the first work roll 216a and the second work roll 216b to the feed lithium strip 210 can be controlled at 0.01-300 m/min with an accuracy of ⁇ 0.01 m/min.
  • the pressure controller 211 can be used to control the pressure of the work roll 216 on the feed lithium strip 210, the first substrate 220 and the second substrate 220, and the pressure control range can be 0.2-1.5 MPa, and the precision can be ⁇ 0.01 MPa.
  • the speed controller 212 can be used to control the speed of the work roll 216 to the incoming lithium strip 210.
  • the speed of the work roll 216 to the feed lithium strip 210 can range from 0.01 to 300 m/min with an accuracy of ⁇ 0.01 m/min.
  • the gap controller 213 can be used to control the gap between the first work roll 216a and the second work roll 216b, the gap control range can be 0-1.5 mm, and the accuracy can be ⁇ 0.001 mm.
  • the gap adjustment mechanism 217 can be used to adjust the gap between the first work roll 216a and the second work roll 216b, which is feedback to the gap controller 213.
  • the film stripping device 170 is disposed on the left side of the rolling device 160 (when the lithium tape producing apparatus 100 is in the position shown in Fig. 1) such as the discharge side.
  • the stripping device 170 includes a conveying roller 311, a deviation correcting roller 312, and a speed.
  • the conveying roller 311, the peeling film correcting control roller 312, the peeling speed test roller 313, and the peeling and winding roller 314 are spaced from the top to the bottom in the vertical direction.
  • the conveying roller 311 is located below the lithium belt 210.
  • the conveying roller 311 is for pulling the second substrate 230 peeled off from the lithium tape 210, the first substrate 220 and the second substrate 230 which are pressed together by the rolling device 160 (hereinafter referred to as "after peeling"
  • the second substrate 230" is such that the second substrate 230 is continuously peeled off from the lithium tape 210, the first substrate 220, and the second substrate 230 which are pressed together by the rolling device 160.
  • the second substrate 230 In the actual production process, when the second substrate 230 is peeled off, the second substrate 230 will exert a force on the lithium strip 210, which forces the lithium strip 210 to tend to be separated from the first substrate 220; When the material 230 is used, the second substrate 230 applies a force to the lithium strip 210 to prevent the lithium strip 210 from being separated from the first substrate 220, and the transport roller 311 can pull the stripped surface in a direction less than 60° from the horizontal direction.
  • the second substrate 230 is such that the second substrate 230 is continuously peeled off from the lithium tape 210, the first substrate 220, and the second substrate 230 which are pressed together by the rolling device 160.
  • the rolling device 160 may be disposed in the cylinder 214.
  • the lithium tape 210, the first substrate 220, and the second substrate 230 are peeled off together and pulled by the conveying roller 311.
  • the stripping correction control roller 312 can be used to correct the transfer position of the second substrate 230 after peeling during the winding process.
  • the stripping correction control roller 312 may have a torque control range of 5 to 250 N/m and an accuracy of ⁇ 1 N/m.
  • the peeling speed test roll 313 can be used to detect and control the traveling speed of the peeled second substrate 230.
  • the stripping speed test roll 313 may have a speed control range of 0.01 to 300 m/min and an accuracy of ⁇ 0.01 m/min.
  • the stripping roll 314 can be used to wind up the peeled second substrate 230.
  • the stripping and unwinding roller 314 can be wound under the control of the stripping magnetic powder controller 3141 to ensure that the stripped second substrate 230 passes through the stripping and rectifying control roller 312 and has a certain volume during the winding process. The tension is thereby ensured that the second substrate 230 after peeling does not show a build-up or breakage during the winding process.
  • the stripped magnetic powder controller 3141 may have a torque range of 2-400 N/m and an accuracy of ⁇ 1 N/m.
  • the passivation device 180 In the direction of travel of the lithium strip 210, the passivation device 180 is located behind the stripping device 170, i.e., the lithium strip 210 passes through the stripping device 170 and then passes through the passivation device 180.
  • the passivation device 180 includes a passivation gas bottle 321, a pneumatic pump 322, a control member 323, a gas delivery conduit 324, and a gas nozzle 345.
  • the passivation gas bottle 321 can be used to supply and store the passivation gas.
  • the passivation gas can be carbon dioxide or nitrogen dioxide.
  • the air pump 322 is sealingly connected between the passivation gas bottle 321 and the control member 323 through a gas supply pipe 324.
  • the air pump 322 is used to control the passivation gas to supply high pressure gas to the surface of the stripped lithium strip 210.
  • the control unit 323 is hermetically connected between the air pump 322 and the gas nozzle 345 through a gas transmission pipe 324.
  • the control unit 323 turns off the air pump 322; when the device needs to be shut down for maintenance, the control unit 323 can shut off the gas supply of the passivation gas bottle 321.
  • the gas nozzle 345 is suspended below the stripped lithium strip 210 for spraying a passivation gas on the surface of the stripped lithium strip 210 to passivate the surface of the stripped lithium strip 210, thereby stripping the strip of lithium strip
  • the surface of 210 forms a passivation film, so that the rolled lithium strip 210 can be quickly passivated after leaving the stripping zone, thereby preventing the lithium strip 210 from reacting with air.
  • the passivation time can be from 5 to 180 s.
  • the winding device 190 is located after the passivation device 180, i.e., the lithium strip passes through the passivation device 180 and then passes through the winding device 190.
  • the winding device 190 includes a winding speed control roller 331, a winding correction roller 332, and a winding roller 333.
  • the winding speed control roller 331 can be used to pull the passivated lithium tape 210 containing the single-layer first substrate 220 to travel and maintain a certain traveling speed.
  • the speed control range of the winding speed control roller 331 may be 0.01-300 m/min, and the precision may be ⁇ 0.01 m/min.
  • the winding correction control roller 332 is disposed between the winding speed control roller 331 and the winding roller 333 for correcting the conveying position of the lithium tape 210 containing the single-layer first substrate 220 during the winding process.
  • the torque control range of the correcting control roller 332 may be 5-250 N/m, and the accuracy may be ⁇ 1 N/m.
  • the winding roller 333 is for winding the lithium tape 210 containing the single-layer first substrate 220.
  • the winding roller 333 can be wound up by the winding magnetic powder controller 3331 to ensure that the lithium tape 210 containing the single-layer first substrate 220 passes through the correcting control roller 332 and has a certain degree in the winding process. The tension, thereby ensuring that the lithium tape 210 containing the single-layer first substrate 220 does not show up or break during the winding process.
  • the winding magnetic powder controller 3331 can have a torque range of 2-400 N/m and an accuracy of ⁇ 1 N/m.
  • the lithium tape producing apparatus 100 sequentially sets the lithium tape unwinding device 110, the correcting device 141, the rolling device 160, the stripping device 170, the passivation device 180, and the winding device 190 in the traveling direction of the lithium tape 210, and A first unwinding device 120 and a second unwinding device 130 are disposed between the lithium tape unwinding device 110 and the correcting device 141, and the lithium tape unwinding device 110, the first unwinding device 120, and the second unwinding device 130 are The lithium strip 210, the first substrate 220 and the second substrate 230 are respectively conveyed to the rolling device 160 via the corrector 141, and the lithium strip 210 of the corresponding thickness is obtained by adjusting parameters such as the gap, pressure and speed of the rolling device 160.
  • the second base material 230 After the second base material 230 is peeled off from the lithium strip 210, the first base material 220, and the second base material 230 which are pressed together by the rolling device 160 by the stripping device 170, one side surface of the lithium strip 210 is exposed. So that the rolled lithium strip 210 can be quickly blunt by the passivation device 180 after leaving the stripping zone The lithium tape 210 is prevented from reacting with the air, so that the lithium tape 210 can be stored for a long time, and the dependence of the factory on the solid particle lithium powder and the production cost can be greatly reduced.
  • the lithium strip production apparatus 100 can produce a metal lithium strip having a uniform thickness of 1-20 ⁇ m.
  • the lithium strip production apparatus 100 has a simple structure, can greatly reduce the cost, and is advantageous for industrial production.
  • the above is a specific structure of the lithium strip production apparatus 100 in an embodiment of the present invention, and a method of using the lithium strip production apparatus 100 will be described below by way of a specific example.
  • the rolling device 160 is turned on and off, the parameter controller in the rolling device 160 is used to set the pressure controller 211 to 0.8 MPa, the speed controller 212 is adjusted to 30 m/min, and the lash adjuster 213 is adjusted to 0.02 mm. And using the small piece of lithium strip 210, the first substrate 220 and the second substrate 230 to perform a pre-test on the roll of the rolling device 160; after the desired thickness of the lithium strip is required to be 5 ⁇ m by speed, clearance, and pressure fine adjustment, the power is turned off. .
  • the unwinding roller 111, the lithium tape speed control roller 112, the lithium tape tension control roller tension control roller 113 of the lithium tape unwinding device 110 pass through the lithium tape 210 while the first unwinding roller 121 of the first unwinding device 120
  • the first speed control roller 122 and the first tension control roller 123 pass through the first base material 220, and pass through the second base at the unwinding roller 131, the speed control roller 132, and the tension control roller 133 of the second unwinding device 130.
  • the second substrate 230 after peeling passes through the conveying roller 311, the stripping speed control roller 312, the stripping tension control roller 313, and reaches the stripping and winding roller 314; the lithium to be rolled containing the single layer first substrate 220
  • the tape 210 is passed through the tape to the subsequent winding roller 333, and finally the lithium tape 210 to be wound containing the single-layer first substrate 220 is fixed to the take-up roller 333.
  • the start button of the lithium ribbon producing apparatus 100 by pressing the start button of the lithium ribbon producing apparatus 100, the desired 5 ⁇ m lithium strip 210 can be obtained by rolling, and the surface of the lithium strip 210 is well-passivated, which can be stored for a long time and can be avoided. The air reacts.
  • the rolling device 160 switch is opened, the parameter controller in the rolling device 160 is used to set the pressure controller 211 to 0.6 MPa, the speed controller 212 to 15 m/min, and the lash adjuster 213 to 0.04 mm.
  • the small lithium strip 210, the first substrate 220 and the second substrate 230 are subjected to a pre-testing machine for the roll of the rolling device 160; after the desired thickness of the lithium strip 210 is required to be 5 ⁇ m by speed, clearance, and pressure fine adjustment, the power is turned off. .
  • the unwinding roller 111, the lithium tape speed control roller 112, the lithium tape tension control roller tension control roller 113 of the lithium tape unwinding device 110 pass through the lithium tape 210 while the first unwinding roller 121 of the first unwinding device 120
  • the first speed control roller 122 and the first tension control roller 123 pass through the first base material 220, and pass through the second base at the unwinding roller 131, the speed control roller 132, and the tension control roller 133 of the second unwinding device 130.
  • the second substrate 230 after peeling passes through the conveying roller 311, the stripping speed control roller 312, the stripping tension control roller 313, and reaches the stripping and winding roller 314; the lithium to be rolled containing the single layer first substrate 220
  • the tape 210 is passed through the tape to the subsequent winding roller 333, and finally the lithium tape 210 to be wound containing the single-layer first substrate 220 is fixed to the take-up roller 333.
  • the desired 10 ⁇ m lithium strip can be obtained by rolling, and the surface of the lithium strip 210 is well passivated, which can be stored for a long time and can be avoided. Free of reaction with air.
  • FIG. 3 is a schematic flow chart of a method for producing a lithium strip according to an embodiment of the present invention.
  • the lithium ribbon production method may be implemented using the lithium ribbon production apparatus 100 described above.
  • the lithium tape production method includes:
  • pre-passivation placing the lithium strip to be rolled into a drying room, spraying a passivation gas on the exposed surface of the lithium strip to be rolled, and performing passivation treatment, and the passivation time is 5-20 hours. ;
  • the step of selecting the material in S100 may specifically include: observing the surface of the lithium strip by using a microscope or a magnifying glass, and removing the lithium strip containing impurities and bubbles, thereby selecting a qualified lithium strip to be rolled.
  • the thickness of the lithium strip in S100 may range from 30 to 1000 ⁇ m, that is, the thickness of the qualified lithium strip to be rolled may range from 30 to 1000 ⁇ m.
  • step S200 the hardness of the lithium strip as a whole can be made to a desired softness, and the lithium strip to be rolled can be prevented from being oxidized before being rolled, so that it can be stored for a long time.
  • a qualified lithium strip to be rolled into a passivation box in a dry room may be passivated.
  • the passivation time is preferably 5-8h, the passivation time is short, and the surface of the lithium strip after rolling is prone to oxidation. The longer passivation time may affect the capacity of the equipment.
  • the first substrate and the second substrate may be one or a combination of a polymer film, a metal film, and an inorganic material film.
  • the thickness of the first substrate and the second substrate may be between 1 and 3000 ⁇ m.
  • the first substrate and the second substrate may be respectively Teflon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyarylsulfone, polyethylene terephthalate, acrylonitrile-butadiene- A combination of one or more of styrene copolymer, polyimide, polyether sulfone, copper foil, aluminum foil, non-woven fabric, glassine paper or fiber paper.
  • the belt can provide better cushioning and protection.
  • surface treating the surface of the first substrate and the second substrate that is in contact with the lithium strip to be rolled specifically includes:
  • One or more combinations of materials such as trifluoropropylmethylcyclotrisiloxane, dichloroethane, hexamethyldisiloxane, and cyclopentasiloxane, such that the first substrate
  • the roughness of the surface in contact with the lithium strip to be rolled is smaller than the roughness of the surface of the second substrate in contact with the lithium strip to be rolled, so that the first substrate and the lithium strip to be rolled are The adsorption force is greater than the adsorption force between the second substrate and the lithium strip to be rolled.
  • a preferred material is dimethyl silicone oil, cyclopentasiloxane, and the material can form a dense separation layer on the surface of the first substrate and the second substrate to ensure better stripping of the rolled lithium strip. At the same time, the material can form different surface adhesions on the surface of the substrate.
  • the motion parameters such as the heating temperature, pressure, gap and speed of the rolling device can be adjusted in advance;
  • the heating temperature range is less than 120 ° C, and the heating temperature is too high, which easily leads to the first substrate and the second The substrate is deformed, which in turn causes wrinkles and breakage of the first substrate and the second substrate during rolling. Moreover, the temperature should not be lower than 35 ° C. If the heating temperature is too low, the lithium strip to be rolled may not be able to produce a good extension, and the desired thickness requirement is not achieved.
  • the pressure, speed and clearance of the work rolls can be adjusted to the thickness of the lithium strip of the desired thickness.
  • the pressure of the work roll can be adjusted between 0.2 and 1.5 MPa, the pressure of the work roll is preferably in the range of 0.4-1.0 MPa, and the pressure of the work roll is too large, which tends to cause crushing of the first substrate and the second substrate, and further The risk of ignition of the lithium strip to be rolled during the rolling process is caused; if the work roll pressure is too small, the lithium strip to be rolled may not reach the desired thickness requirement during the rolling process.
  • the speed of the work roll can be adjusted between 0.001-60 m/min, preferably the work roll speed is 1-30 m/min, and the work roll speed is too fast, which may cause the lithium strip to be rolled to fail to meet the expected rolling process. Thickness requirements; if the work roll speed is too slow, it will cause the lithium belt to be rolled to fail to meet the capacity requirements during the rolling process.
  • the gap between the work rolls can be adjusted between 0-5 mm.
  • the work roll gap is 0.01-0.5 mm, and the work roll gap is too small, which easily causes the first substrate and the second substrate to be crushed during rolling, thereby causing the lithium to be rolled
  • the belt has a risk of fire during the rolling process; the work roll gap is too large, and the lithium strip to be rolled does not reach the desired thickness requirement during the rolling process.
  • the two work rolls can be rolled at a constant speed or differentially.
  • the speeds of the two work rolls are the same, and may be 0.001 to 60 m/min, preferably 0.1 to 30 m/min.
  • the speed of the slow work rolls and the speed of the fast work rolls are between 0.3% and 100%, and the preferred speed ratio is 5%-30. Between %, if the speed ratio of the two work rolls is too small, it may cause a discontinuous appearance of the lithium strip to be rolled during the rolling process; and if the speed ratio of the two work rolls is too large, it may cause the rolls to be rolled. Lithium tape does not meet the expected thickness requirements during rolling. By matching the different speeds between the two rolls, it is ensured that the amount of lithium consumed during the loading of the lithium strip does not increase with speed, and production efficiency is ensured.
  • the function of the S600 is to form a passivation film on the exposed surface of the lithium tape after peeling off the second substrate, so that the rolled lithium strip can be quickly passivated after peeling off the second substrate, thereby preventing the lithium strip from being Air reaction.
  • the passivation time in S600 can be 5-180 s.
  • all steps can be carried out at an ambient temperature of 10-35 ° C and a humidity of 0-20% to facilitate the rolling operation of the lithium strip.
  • the thickness of the lithium strip can be between 1 and 20 ⁇ m, which is suitable for the thickness of various ultra-thin lithium batteries, thereby meeting the needs of the battery enterprise; Moreover, the production process is less polluting to the environment and there are no safety hazards.
  • the lithium ribbon production method will be described below with specific examples.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • a first substrate and a second substrate having a length of 500 mm and a width of 75 mm were prepared, and the surfaces of the first substrate and the second substrate were coated with dimethyl silicone oil.
  • the material of the first substrate is polyethylene
  • the material of the second substrate is glassine paper
  • the work roll is heated, the temperature of the work roll reaches 80 ° C, and the speed of the first work roll is adjusted to 3 m/min.
  • the speed of the second work roll was adjusted to 30 m/min, the gap between the two work rolls was adjusted to 5 ⁇ m, and the air pressure was controlled to 0.6 MPa.
  • a passivated lithium strip having a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the rolling mill roll to complete the rolling process, thereby obtaining a lithium strip of 5 ⁇ m, the first substrate and the lithium substrate.
  • the adhesion between the tapes was 0.12 N
  • the adhesion between the second substrate and the lithium tape was 0.038 N.
  • the low-power microscope was used to observe the 100 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 25 ° C and a humidity of 2%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • the work roll is heated so that the temperature of the work roll reaches 80 ° C, the speed of the first work roll is adjusted to 3 m / min, the speed of the second work roll is adjusted to 3 m / min, and the gap between the two work rolls is adjusted. It is 3 ⁇ m and the air pressure is controlled to 0.65 MPa.
  • a lithium strip with a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the rolling mill roll to complete the rolling process, and a lithium strip of 3 ⁇ m is obtained, the first substrate
  • the adhesion to the lithium tape was 0.08 N, and the adhesion between the second substrate and the lithium tape was 0.051 N.
  • a first substrate and a second substrate having a length of 500 mm and a width of 75 mm are prepared, and a surface material is coated on the surfaces of the first substrate and the second substrate.
  • the material of the first substrate is acrylonitrile-butadiene-styrene copolymer
  • the surface material coated is dimethyl silicone oil
  • the material of the second substrate is polyethylene terephthalate.
  • the surface material applied is an acrylic polysiloxane.
  • the work roll is heated so that the temperature of the work roll reaches 85 ° C, the speed of the first work roll is adjusted to 5 m / min, the speed of the second work roll is adjusted to 5 m / min, and the gap between the two work rolls is adjusted. It is 10 ⁇ m and the air pressure is controlled to 0.6 MPa.
  • a passivated lithium strip having a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the rolling mill roll to complete the rolling process, thereby obtaining a lithium strip of 10 ⁇ m, the first substrate and the lithium substrate.
  • the adhesion between the tapes was 0.15 N, and the adhesion between the second substrate and the lithium tape was 0.045 N.
  • the low-power microscope was used to observe the 250 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 27 ° C and a humidity of 1%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • a first substrate and a second substrate made of two pieces of glassine paper having a length of 500 mm and a width of 75 mm were prepared, and hexamethyldisiloxane was applied to the surfaces of the first substrate and the second substrate.
  • the work roll is heated so that the temperature of the work roll reaches 35 ° C, the speed of the slow work roll is adjusted to 10 m / min, and will work quickly
  • the speed of the rolls was adjusted to 10 m/min, the gap between the two work rolls was adjusted to 20 ⁇ m, and the air pressure was controlled to 0.45 MPa.
  • a lithium strip with a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the work roll to complete the rolling process, and a lithium strip of 20 ⁇ m is obtained, the first substrate
  • the adhesion to the lithium tape was 0.07 N, and the adhesion between the second substrate and the lithium tape was 0.055 N.
  • the low-power microscope was used to observe the 250 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 27 ° C and a humidity of 1%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip. Preparing a first substrate and a second substrate made of two pieces of polyethylene terephthalate having a length of 500 mm and a width of 75 mm, and coating the surface of the first substrate with dimethyl silicone oil, for the second The surface of the substrate is coated with octadecane.
  • the work roll is heated so that the temperature of the work roll reaches 48 ° C, the speed of the slow work roll is adjusted to 1.5 m / min, and the speed of the fast work roll is adjusted to 20 m / min, between the two work rolls
  • the gap was adjusted to 15 ⁇ m and the air pressure was controlled to 0.45 MPa.
  • a lithium stripe having a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the work roll to complete the rolling process, thereby obtaining a lithium strip of 15 ⁇ m, the first substrate
  • the adhesion to the lithium tape was 0.085 N, and the adhesion between the second substrate and the lithium tape was 0.032 N.
  • the low-power microscope was used to observe the 100 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 25 ° C and a humidity of 2%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • a first substrate and a second substrate having a length of 500 mm and a width of 75 mm are prepared, and a surface material is coated on the surfaces of the first substrate and the second substrate.
  • the material of the first substrate is polyurethane, the surface material coated is hexadecane; the material of the second substrate is polyethersulfone, and the surface material coated is cyclopentasiloxane.
  • the work roll is heated so that the temperature of the work roll reaches 60 ° C, the speed of the slow work roll is adjusted to 3 m / min, and the speed of the fast work roll is adjusted to 30 m / min, the two work
  • the gap between the rolls was adjusted to 15 ⁇ m and the gas pressure was controlled to 0.2 MPa.
  • a lithium stripe having a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the work roll to complete the rolling process, thereby obtaining a lithium strip of 15 ⁇ m, the first substrate
  • the adhesion to the lithium tape was 0.09 N
  • the adhesion between the second substrate and the lithium tape was 0.043 N.
  • the low-power microscope was used to observe the 100 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 25 ° C and a humidity of 2%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • a first substrate and a second substrate having a length of 500 mm and a width of 75 mm are prepared, and a surface material is coated on the surfaces of the first substrate and the second substrate.
  • the material of the first substrate is polyethylene terephthalate
  • the surface material coated is hexadecane
  • the material of the second substrate is glassine paper
  • the surface material coated is dimethyl Base silicone oil.
  • the work roll is heated so that the temperature of the work roll reaches 90 ° C, the speed of the slow work roll is adjusted to 15 m / min, and the speed of the fast work roll is adjusted to 60 m / min, the gap between the two work rolls
  • the pressure was adjusted to 15 ⁇ m and the gas pressure was controlled to 0.8 MPa.
  • a lithium stripe having a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the work roll to complete the rolling process, thereby obtaining a lithium strip of 15 ⁇ m, the first substrate
  • the adhesion to the lithium tape was 0.093 N, and the adhesion between the second substrate and the lithium tape was 0.042 N.
  • the low-power microscope was used to observe the 250 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 27 ° C and a humidity of 1%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • a first substrate and a second substrate having a length of 500 mm and a width of 75 mm are prepared, and a surface material is coated on the surfaces of the first substrate and the second substrate.
  • the material of the first substrate is glassine paper, the surface material coated is dimethyl silicone oil; the material of the second substrate is polyethylene terephthalate, and the surface material coated is acrylic acid.
  • the work roll is heated so that the temperature of the work roll reaches 100 ° C, the speed of the slow work roll is adjusted to 0.001 m / min, and the speed of the fast work roll is adjusted.
  • the gap between the two work rolls was adjusted to 10 ⁇ m at 3 m/min, and the air pressure was controlled to 1.0 MPa.
  • a lithium strip with a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the work roll to complete the rolling process, thereby obtaining a lithium strip of 10 ⁇ m, the first substrate
  • the adhesion to the lithium tape was 0.082 N, and the adhesion between the second substrate and the lithium tape was 0.063 N.
  • the low-power microscope was used to observe the 100 ⁇ m-thick lithium strip, and the surface containing impurities was removed. Then, the qualified lithium strip was subjected to passivation treatment at an ambient temperature of 25 ° C and a humidity of 2%, and the passivation time was 4 h.
  • the passivation treatment can achieve a uniform hardness of the lithium strip.
  • a first substrate and a second substrate having a length of 500 mm and a width of 75 mm are prepared, and a surface material is coated on the surfaces of the first substrate and the second substrate.
  • the material of the first substrate is polyimide
  • the surface material coated is cyclohexane
  • the material of the second substrate is polyethylene terephthalate
  • the surface material coated is six Methyl disiloxane.
  • a lithium strip with a length of 32 mm and a width of 70 mm is placed between the first substrate and the second substrate and fed into the rolling mill roll to complete the rolling process, thereby obtaining a 7 ⁇ m lithium strip, the first substrate
  • the adhesion to the lithium tape was 0.11 N
  • the adhesion between the second substrate and the lithium tape was 0.071 N.
  • the lithium strip may be a metal lithium strip or a metal lithium alloy strip.
  • the thickness of the lithium tape prepared in Example 3-11 is within 20 ⁇ m, and the adhesion between the first substrate and the second substrate is generally 1-3 times or so, and the peeling process of the second substrate will be It will be very smooth.
  • the lithium strip production apparatus 100 and the lithium strip production method in the embodiments of the present invention have the following beneficial effects:
  • the lithium strip production apparatus and method in the embodiments of the present invention can select a suitable first substrate and a second substrate according to the process requirements, and can realize continuous production of a 1-20 ⁇ m lithium strip without sticking rolls and broken strips. Phenomenon, convenient operation, simple and practical;
  • the surface of the first substrate and the second substrate are surface-treated, such as coating octadecane, etc., so that the surfaces of the first substrate and the second substrate can be rolled.
  • Different lubrication effects are achieved in the process, and at the same time, it is ensured that the lithium strip extruded from the roller can be well separated from the second substrate and the lithium strip extruded from the roller is attached to the first substrate;
  • the lithium strip production method in the embodiment of the present invention integrates the rolling process and the surface treatment of the first substrate and the second substrate surface, such as coating octadecane or the like, which can be thicker in the future.
  • the lithium tape is rolled together with the first substrate and the second substrate, and then passivated on the exposed surface of the lithium tape after peeling off the second substrate to form a passivation film on the surface of the lithium strip to prevent lithium
  • the belt reacts with the air to realize that the rolled lithium strip is directly wound in the air;
  • the lithium strip production method in the embodiment of the present invention achieves matching of different speeds between two work rolls by adjusting the speed of the two work rolls, and the substrate on one side is like the first substrate or the second substrate. Slower material can effectively reduce the cost of using the substrate; through the matching of the different speeds between the two work rolls, it can ensure that the amount of lithium consumed during the feeding of the lithium strip does not increase with the speed increase, and the production can be ensured. effectiveness.

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Abstract

一种锂带生产方法，包括：表面处理，将待辊压锂带（210）完全置于第一基材（220）和第二基材（230）之间，并分别对第一基材和第二基材上与待辊压锂带接触的表面进行表面处理使得第一基材与待辊压锂带之间的吸附力大于第二基材与待辊压锂带之间的吸附力；辊压，对待辊压锂带及待辊压锂带两侧的第一基材和第二基材进行辊压，使三者压合在一起；剥离，将第二基材从被辊压装置（160）压合在一起的锂带、第一基材和第二基材中剥离；钝化，对锂带外露的表面进行钝化处理。上述锂带生产方法可以确保锂带在生产过程中不断带，不粘接。

Description

锂带生产方法 技术领域
本发明涉及锂离子电池领域，尤其涉及一种锂带生产方法。
背景技术
锂被科学家誉为“能源之星”，以锂作为负极活性物质的两次电池有着无可比拟的优势。然而，由于锂化学性质活泼，在常温下很容易和空气中的氧气、氮气、水分等反应，所以电池级锂带的加工面临较高的挑战。通常，电池级锂带在生产过程中易出现粘连现象，导致断带。
发明内容
本发明的目的在于提供一种不粘连且不易断带的锂带生产方法。
为实现上述目的，本发明提出了一种锂带生产方法，
包括下列原材料：第一基材、第二基材以及待辊压锂带，包括下列步骤：
辊压：将所述第一基材、所述待辊压锂带以及所述第二基材依次层叠放置并通过辊压装置进行辊压，使三者压合在一起，其中，所述待辊压锂带的两侧分别被所述第一基材以及所述第二基材完全覆盖；
剥离：将所述第二基材从被所述辊压装置压合在一起的锂带、所述第一基材和所述第二基材中剥离。
进一步地，所述辊压的步骤之前还包括：调节所述辊压装置的加热温度、压力、间隙和速度具体包括：所述调节所述辊压装置的加热温度、压力、间隙和速度的步骤包括：
对所述辊压装置中用于辊压的两个工作辊进行加热，所述工作辊的加热温度在35-120℃之间调节；
将所述工作辊的压力在0.2～1.5MPa之间调节；
将所述工作辊之间的间隙在0-5mm之间调节；
将所述工作辊的速度在0.001-60m/min之间调节。
进一步地，所述将所述工作辊的速度在0.001-60m/min之间调节进一步包括：
将两个所述工作辊中速度慢的工作辊的速度与速度快的工作辊的速度比控制在0.3％-100％之间。
进一步地，所述两个工作辊中速度慢的工作辊的速度与速度快的工作辊的速度比控制在5％-30％之间。
进一步地，
所述第一基材为高分子膜片、金属膜片或无机材料膜片；
和/或
所述第二基材为高分子膜片、金属膜片或无机材料膜。
进一步地，所述第一基材和所述第二基材分别采用特氟龙、聚乙烯、聚丙烯、聚氨酯、聚四氟乙烯、聚芳砜、聚对苯二甲酸乙二醇醚、丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺或聚醚砜中的一种或多种的组合制成。
进一步地，在所述辊压的步骤之前还包括下列步骤：
表面处理：分别对所述第一基材和所述第二基材上与所述待辊压锂带接触的表面进行表面处理使得所述第一基材与所述待辊压锂带之间的吸附力大于所述第二基材与所述待辊压锂带之间的吸附力。
进一步地，所述表面处理的步骤之前还包括：
预先钝化：将所述待辊压锂带置于干燥房内，将钝化气体喷在所述待辊压锂带外露的表面上进行钝化处理，钝化时间为5-20小时。
进一步地，在所述剥离的步骤之后还包括；
钝化：对所述锂带外露的表面进行钝化处理。
进一步地，在所述剥离的步骤之后还包括：
收卷：将含所述第一基材的锂带收卷。
本发明实施例中的锂带生产方法通过采用第一基材、第二基材与待辊压锂带进行共同辊压，之后再将第二基材进行剥离的方式可以确保锂带生产过程中不断带，不粘接。
附图说明
图1为本发明一实施例中锂带生产设备的结构示意图。
图2为本实用新型一实施例中辊压装置、剥离装置以及钝化装置的配合结构示意图。
图3为本发明一实施例中锂带生产方法的流程示意图。
具体实施方式
以下结合附图对本发明的原理和特征进行描述，所举实施例只用于解释本发明，并非用于限定本发明的范围。对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，根据本发明精神所获得的所有实施例，都属于本发明的保护范围。
图1为本发明一实施例中锂带生产设备的结构示意图。如图1中所示，锂带生产设备100包括锂带放卷装置110、第一放卷装置120、第二放卷装置130、纠偏器141、密封工作室150、辊压装置160、剥膜装置170、 钝化装置180和收卷装置190。其中，分别由锂带放卷装置110、第一放卷装置120和第二放卷装置130输送的锂带210、第一基材220和第二基材230经过纠偏器141进入设于密封工作室150中的辊压装置160；经过辊压装置160辊压后，剥膜装置170将第二基材230从压合在一起的锂带210、第一基材220和第二基材230中剥离并收卷；之后，收卷装置190将经过钝化装置180处理后的锂带210及与锂带210粘合的第一基材220收卷。
具体地，锂带放卷装置110包括锂带放卷辊111、锂带速度测试辊112和锂带张力控制辊113。其中，锂带放卷辊111用于安装待处理的锂带210。处理的锂带210的来料厚度范围可在0.040-1500mm。在一实施例中，锂带放卷辊111可在锂带磁粉控制器1111控制下放卷锂带210，以确保锂带210在放卷过程中保持一定的张力。磁粉控制器1111的扭矩范围可以为2-400N/m，精度可以为±1N/m。
锂带速度测试辊112设置于锂带放卷辊111和锂带张力控制辊113之间。当锂带生产设备100处于图1中所示位置时，放卷辊111、锂带速度测试辊112和锂带张力控制辊113在竖直方向上间隔设置，锂带速度测试辊112位于锂带放卷辊111下方并位于锂带张力控制辊113上方。锂带速度测试辊112可用于测试并控制放卷锂带210的速度，以确保锂带210在进料前的速度符合锂带放卷辊111和锂带张力控制辊113的张力要求。在一实施例中，速度测试辊112的速度范围可以为0.01-300m/min，精度可以为±0.01m/min。
张力控制辊113可用于确保锂带210在传送过程中保持直线进料，不出现锂带210堆积或是拉断。张力控制辊113还可用于调节锂带210在放卷过程中张力的大小。在一实施例中，张力控制辊113的扭矩控制范围可以为5-250N/m，精度可以为±1N/m。当锂带生产设备100处于图1中所示位置时，经过张力控制辊113朝向纠偏器141及辊压装置160输送的锂 带210大致沿着水平方向行进。
第一放卷装置120设置在锂带放卷装置110与纠偏器141之间。第一放卷装置120包括第一放卷辊121、第一速度测试辊122、第一张力控制辊123和第一牵引辊124。当锂带生产设备100处于图1中所示位置时，第一放卷辊121、第一速度测试辊122、第一张力控制辊123和第一牵引辊124在竖直方向上自上向下间隔设置，且第一牵引辊124位于锂带210的上方。
其中，第一放卷辊121用于安装第一基材220。第一基材220的材料不能与锂带210发生反应。第一基材220的厚度范围可以为1-3000μm。在一实施例中，第一基材220的材料可以为特氟龙、聚乙烯、聚丙烯、聚氨酯、聚四氟乙烯、聚芳砜聚对苯二甲酸乙二醇醚、丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺、聚醚砜、铜箔、铝箔、无纺布、格拉辛纸或纤维纸张中的一种或多种组合，并且优选为丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺，其材料具有较大的拉伸强度和较好的弹性变形，对于待辊压锂带能够起到较好的缓冲和保护作用。第一放卷辊121可在第一磁粉控制器1211控制下放卷第一基材220，以确保第一基材220在放卷过程中保持一定的张力。第一磁粉控制器1211的扭矩范围可以为2-400N/m，精度可以为±1N/m。
第一速度测试辊122设置于第一放卷辊121和第一张力控制辊123之间。第一速度测试辊122可用于测试并控制放卷第一基材220的速度，以确保第一基材220在进料前的速度符合第一放卷辊121和第一张力控制辊123的张力要求。在一实施例中，第一速度测试辊122的速度范围可以为0.01-300m/min，精度可以为±0.01m/min。
第一张力控制辊123可用于确保第一基材220在传送过程中保持直线进料，不出现第一基材220堆积或变形。第一张力控制辊123还可用于调节第一基材220在放卷过程中张力的大小。在一实施例中，第一张力控制 辊123的扭矩控制范围可以为5-250N/m，精度可以为±1N/m。
第一牵引辊124设置在锂带210上方并临近纠偏器141。牵引辊124可用于将第一基材220导引进入纠偏器141。
第二放卷装置130设置在锂带放卷装置110与纠偏器141之间，并与第一放卷装置120位于锂带210或纠偏器141的两侧。当锂带生产设备100处于图1中所示位置时，第二放卷装置130位于锂带210或纠偏器141的下方，第一放卷装置120位于锂带210或纠偏器141的上方，即第一放卷装置120和第二放卷装置130在竖直方向上位于锂带210或纠偏器141的两侧。
其中，第二放卷装置130包括第二放卷辊131、第二速度测试辊132、第二张力控制辊133和第二牵引辊134。第二放卷辊131用于安装第二基材230。第二基材230的材料不能与锂带210发生反应。第二基材230的厚度范围可以为1-3000μm。在一实施例中，第二基材230的材料可以为特氟龙、聚乙烯、聚丙烯、聚氨酯、聚四氟乙烯、聚芳砜聚对苯二甲酸乙二醇醚、丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺、聚醚砜、铜箔、铝箔、无纺布、格拉辛纸或纤维纸张中的一种或多种组合，优选丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺，其材料具有较大的拉伸强度和较好的弹性变形，对于待辊压锂带能够起到较好的缓冲和保护作用。第二放卷辊131可在第二磁粉控制器1311控制下放卷第二基材230，以确保第二基材230在放卷过程中保持一定的张力。磁粉控制器1311的扭矩范围可以为2-400N/m，精度可以为±1N/m。
第二速度测试辊132设置于第二放卷辊131和第二张力控制辊133之间。第二速度测试辊132可用于测试并控制放卷第二基材230的速度，以确保第二基材230在进料前的速度符合第二放卷辊131和第二张力控制辊133的张力要求。在一实施例中，第二速度测试辊122的速度范围可以为0.01-300m/min，精度可以为±0.01m/min。
第二张力控制辊133可用于确保第二基材230在传送过程中保持直线进料，不出现第二基材230堆积或变形。第二张力控制辊133还可用于调节第二基材230在放卷过程中张力的大小。在一实施例中，第二张力控制辊133的扭矩控制范围可以为5-250N/m，精度可以为±1N/m。
第二牵引辊134设置在锂带210下方、临近纠偏器141并与第一牵引辊124对应设置。第二牵引辊134可用于将第二基材230导引进入纠偏器141。通过在锂带210的两侧靠近纠偏器141处设置第一牵引辊124和第二牵引辊134，可将第一基材220和第二基材230从锂带210的两侧导向锂带210并导入到纠偏器141中，使得第一基材220和第二基材230可以更均匀地、更平整地贴设在锂带210的两侧。
如图2所示，纠偏器141设置在辊压装置160的右侧(当锂带生产设备100处于图1中所示位置时)如进料侧。纠偏器141可用于确保锂带210、第一基材220和第二基材230保持一定的位置进入辊压装置160中。纠偏器141还可用于确保锂带210、第一基材220和第二基材230以相同的速度进入辊压装置160中。
密封工作室150用于提供整个设备的工作氛围。在一实施例中，密封工作室150中的湿度要求1％-50％，温度要求在10-35°之间。
辊压装置160包括气缸214、承载板215、工作辊216、压力控制器211、速度控制器212、间隙控制器213和间隙调节机构217。
其中，气缸214用于容纳承载板215及工作辊216，并用于控制承载板215两侧的气压或液压使得承载板215在气缸214中滑动并移动至预设位置。气缸214还用于控制对压力的反馈，以防止第一基材220、第二基材230及锂带210在辊压过程中所受压力过大而导致辊隙波动。
承载板215包括间隔设置的第一承载板215a和第二承载板215b。第一承载板215a和第二承载板215b滑动地设置在气缸214中。通过调节第一承载板215a/第二承载板215b两侧的气压或液压使得第一承载板215a/ 第二承载板215b在气缸214中滑动并移动至预设位置。
工作辊216可用于对锂带210、第一基材220和第二基材230进行辊压。在一实施例中，工作辊216的辊径可以为20-1000mm，表面硬度可以为洛氏硬度60-100。工作辊216的材料可以为聚乙烯、聚丙烯、特氟隆、聚酰亚胺、聚碳酸酯、不锈钢、钼等材料的一种或多种组合。
工作辊216包括间隔设置的第一工作辊216a和第二工作辊216b。第一工作辊216a和第二工作辊216b可通过支架219分别设置在第一承载板215a和第二承载板215b上，从而可以随同第一承载板215a和/或第二承载板215b在气缸214中运动。通过调节第一承载板215a/第二承载板215b两侧的气压或液压，可以单独调节第一承载板215a/第二承载板215b及第一工作辊216a/第二工作辊216b的速度。在一实施例中，第一工作辊216a和第二工作辊216b对进料锂带210的速度可以控制在0.01-300m/min，精度可以为±0.01m/min。
压力控制器211可用于控制工作辊216对进料锂带210、第一基材220和第二基材220的压力，压力控制范围可以为0.2-1.5MPa，精度可以为±0.01MPa。
速度控制器212可用于控制工作辊216对进料锂带210的速度，工作辊216对进料锂带210的速度范围可以为0.01-300m/min，精度可以为±0.01m/min。
间隙控制器213可用于控制第一工作辊216a和第二工作辊216b之间的间隙，间隙控制范围可以为0-1.5mm，精度可以为±0.001mm。
间隙调节机构217可用于调节第一工作辊216a和第二工作辊216b之间的间隙，是对间隙控制器213的反馈。
剥膜装置170设置在辊压装置160的左侧(当锂带生产设备100处于图1中所示位置时)如出料侧。
请继续参见图2，剥膜装置170包括传送辊311、纠偏控制辊312、速 度测试辊313和收卷辊314。当锂带生产设备100处于图1中所示位置时，传送辊311、剥膜纠偏控制辊312、剥膜速度测试辊313和剥膜收卷辊314在竖直方向上自上向下间隔设置，且传送辊311位于锂带210的下方。
其中，传送辊311用于牵引从被辊压装置160压合在一起的锂带210、第一基材220和第二基材230中剥离出的第二基材230(以下简称“剥离后的第二基材230”)，使得第二基材230从被辊压装置160压合在一起的锂带210、第一基材220和第二基材230中持续剥离。在实际生产过程中，剥离第二基材230时第二基材230将对锂带210施加作用力，该作用力使得锂带210趋向于与第一基材220分离；为了降低剥离第二基材230时第二基材230对锂带210施加的作用力以防止锂带210与第一基材220分离，传送辊311可沿着与水平方向的夹角小于60°的方向牵引剥离后的第二基材230，使得第二基材230从被辊压装置160压合在一起的锂带210、第一基材220和第二基材230中持续剥离。
此外，为了进一步降低剥离第二基材230时第二基材230对锂带210施加的作用力的影响以防止锂带210与第一基材220分离，辊压装置160可在气缸214内设置内置纠偏器221；被辊压装置160压合在一起的锂带210、第一基材220和第二基材230经过内置纠偏器221后，第二基材230从被辊压装置160压合在一起的锂带210、第一基材220和第二基材230中剥离并被传送辊311牵引。通过设置纠偏器221，可降低或消除剥离操作对辊压装置160的滚压操作的影响。
剥膜纠偏控制辊312可用于纠正剥离后的第二基材230在收卷过程中的传送位置。在一实施例中，剥膜纠偏控制辊312的扭矩控制范围可以为5-250N/m，精度可以为±1N/m。
剥膜速度测试辊313可用于检测和控制剥离后的第二基材230的行进速度。剥膜速度测试辊313的速度控制范围可以为0.01-300m/min，精度可以为±0.01m/min。
剥膜收卷辊314可用于对剥离后的第二基材230进行收卷。在一实施例中，剥膜收卷辊314可在剥膜磁粉控制器3141控制下收卷，以确保剥离后的第二基材230经过剥膜纠偏控制辊312后在收卷过程中有一定的张力，从而确保剥离后的第二基材230在收卷过程中不出现堆积或拉断现象。在一实施例中，剥膜磁粉控制器3141的扭矩范围可以为2-400N/m，精度可以为±1N/m。
在锂带210的行进方向上，钝化装置180位于剥膜装置170之后，即锂带210先经过剥膜装置170，然后经过钝化装置180。钝化装置180包括钝化气体瓶321、气压泵322、控制部件323、输气管道324及气体喷嘴345。
其中，钝化气体瓶321可用于供给和储存钝化气体。钝化气体可以为二氧化碳或二氧化氮。
气压泵322通过输气管道324密封连接于钝化气体瓶321与控制部件323之间。气压泵322用于控制钝化气体向剥离后的锂带210的表面提供高压气体。
控制部件323通过输气管道324密封连接于气压泵322与气体喷嘴345之间。当密封工作室150内的惰性气体充满后，控制部件323关闭气压泵322；当设备需要停机检修时，控制部件323可关停钝化气体瓶321的气体供给。
气体喷嘴345悬于剥膜后锂带210的下方，用于将钝化气体喷在剥膜后锂带210的表面上以钝化剥膜后锂带210的表面，从而在剥膜后锂带210的表面形成钝化膜，这样，压延后的锂带210在脱离剥离区后可以快速钝化，从而防止锂带210与空气反应。在一实施例中，钝化时间可以为5-180s。
在锂带210的行进方向上，收卷装置190位于钝化装置180之后，即锂带先经过钝化装置180，然后经过收卷装置190。收卷装置190包括收卷速度控制辊331、收卷纠偏控制辊332和收卷辊333。
收卷速度控制辊331可用于牵引钝化后的含有单层第一基材220的锂带210行进，并保持一定的行进速度。在一实施例中，收卷速度控制辊331的速度控制范围可以为0.01-300m/min，精度可以为±0.01m/min。
收卷纠偏控制辊332设置于收卷速度控制辊331和收卷辊333之间，用于纠正含有单层第一基材220的锂带210在收卷过程中的传送位置。纠偏控制辊332的扭矩控制范围可以为5-250N/m，精度可以为±1N/m。
收卷辊333用于对含有单层第一基材220的锂带210进行收卷。在一实施例中，收卷辊333可由收卷磁粉控制器3331控制下收卷，以确保含有单层第一基材220的锂带210经过纠偏控制辊332后在收卷过程中有一定的张力，从而确保含有单层第一基材220的锂带210在收卷过程中不出现堆积或拉断现象。收卷磁粉控制器3331的扭矩范围可以为2-400N/m，精度可以为±1N/m。
如上所述，锂带生产设备100在锂带210的行进方向上依次设置锂带放卷装置110、纠偏器141、辊压装置160、剥膜装置170、钝化装置180和收卷装置190以及在锂带放卷装置110与纠偏器141之间设置第一放卷装置120和第二放卷装置130，可通过锂带放卷装置110、第一放卷装置120和第二放卷装置130分别将锂带210、第一基材220和第二基材230经过纠偏器141输送到辊压装置160，并通过调节辊压装置160的间隙、压力和速度等参数得到相应厚度的锂带210；并通过剥膜装置170将第二基材230从被辊压装置160压合在一起的锂带210、第一基材220和第二基材230中剥离并收卷；之后，收卷装置190将经过钝化装置180处理后的锂带210及与锂带210粘合的第一基材220收卷，完成锂带210的生产过程。
在通过剥膜装置170将第二基材230从被辊压装置160压合在一起的锂带210、第一基材220和第二基材230中剥离后，锂带210的一侧表面外露，使得压延后的锂带210在脱离剥离区后可以被钝化装置180快速钝 化，防止锂带210与空气反应，使得锂带210可以长时间保存，并可大大减少工厂对于固体颗粒锂粉的依赖以及降低生产成本。
另外，在利用辊压装置160对锂带210进行滚压操作时，锂带210的两侧表面分别被第一基材220和第二基材230覆盖，因此，锂带210未与辊压装置160直接接触，因而不会不粘辊、不易断带。本实用新型一实施例中锂带生产设备100可生产出厚度均匀的1-20μm的金属锂带。此外，锂带生产设备100的结构简单，可以大大降低成本，有利于工业化生产。
上述为本发明一实施例中锂带生产设备100的具体结构，下面以具体的例子说明锂带生产设备100的使用方法。
例1
参照图1，开启辊压装置160开关，利用辊压装置160中的参数调节器设置压力控制器211调节到0.8MPa、速度控制器212调节至30m/min、间隙调节器213调节到0.02mm，并用小片锂带210、第一基材220和第二基材230对辊压装置160的辊逢进行预试机；通过速度、间隙、压力微调得到期望的锂带的厚度要求5μm之后，关闭电源。
在锂带放卷装置110的放卷辊111、锂带速度控制辊112、锂带张力控制辊张力控制辊113走穿锂带210，同时在第一放卷装置120的第一放卷辊121、第一速度控制辊122、第一张力控制辊123走穿第一基材220，并在第二放卷装置130的放卷辊131、速度控制辊132、张力控制辊133走穿第二基材230。之后，把锂带210、第一基材220和第二基材230穿过纠偏器141，并将锂带210、第一基材220和第二基材230再穿过辊压装置160的辊缝；剥离后的第二基材230穿过传送辊311、剥膜速度控制辊312、剥膜张力控制辊313，到达剥膜收卷辊314；含单层第一基材220的待卷锂带210通过穿带到达后续的收卷辊333，最终将含单层第一基材220的待卷锂带210固定在收料辊333上。
调节惰性气体的气压为0.5MPa，将辊压装置160的参数调回到之前 调试的状态，并将速度控制辊112、122、132、312、331和工作辊216调节到30m/min，并将张力控制辊113、123、133、313、332调节到10N/m。此时，按下锂带生产设备100的开始按钮，可以通过轧制得到所需的5μm的锂带210，并且锂带210的表面得到较好地钝化，能够较长时间保存，可避免与空气发生反应。
例2
参照图1，开启辊压装置160开关，利用辊压装置160中的参数调节器设置压力控制器211调节到0.6MPa、速度控制器212调节至15m/min、间隙调节器213到0.04mm，并用小片锂带210、第一基材220和第二基材230对辊压装置160的辊逢进行预试机；通过速度、间隙、压力微调得到期望的锂带210的厚度要求5μm之后，关闭电源。
在锂带放卷装置110的放卷辊111、锂带速度控制辊112、锂带张力控制辊张力控制辊113走穿锂带210，同时在第一放卷装置120的第一放卷辊121、第一速度控制辊122、第一张力控制辊123走穿第一基材220，并在第二放卷装置130的放卷辊131、速度控制辊132、张力控制辊133走穿第二基材230。之后，把锂带210、第一基材220和第二基材230穿过纠偏器141，并将锂带210、第一基材220和第二基材230再穿过辊压装置160的辊缝；剥离后的第二基材230穿过传送辊311、剥膜速度控制辊312、剥膜张力控制辊313，到达剥膜收卷辊314；含单层第一基材220的待卷锂带210通过穿带到达后续的收卷辊333，最终将含单层第一基材220的待卷锂带210固定在收料辊333上。
调节惰性气体的气压为0.5MPa，将辊压装置160的参数调回到之前调试的状态，并将速度控制辊112、122、132、312、331和工作辊216调节到15m/min，并将张力纠偏控制辊113、123、133、313、332调节到5N/m。此时，按下锂带生产设备100的开始按钮，可以通过轧制得到所需的10μm的锂带，并且锂带210的表面得到较好地钝化，能够较长时间保存，可避 免与空气发生反应。
图3为本发明一实施例中锂带生产方法的流程示意图。在一实施例中，该锂带生产方法可采用上述锂带生产装置100实施。如图3所示，锂带生产方法包括：
S100，选料：剔除表面有缺陷的锂带，选出合格的待辊压锂带；
S200，预先钝化：将所述待辊压锂带置于干燥房内，将钝化气体喷在所述待辊压锂带外露的表面上进行钝化处理，钝化时间为5-20小时；
S300，表面处理：分别对所述第一基材和所述第二基材上与所述待辊压锂带接触的表面进行表面处理使得所述第一基材与所述待辊压锂带之间的吸附力大于所述第二基材与所述待辊压锂带之间的吸附力；
S400，辊压：将待辊压锂带、第一基材以及第二基材层叠放置并进行辊压，使三者压合在一起，其中，所述待辊压锂带置于所述第一基材以及第二基材之间，且所述待辊压锂带的两侧分别被所述第一基材以及所述第二基材完全覆盖；
S500，剥离：将所述第二基材从被所述辊压装置压合在一起的锂带、所述第一基材和所述第二基材中剥离；
S600，钝化：对所述合格的待辊压锂带的表面进行钝化处理；
S700，收卷：将含所述第一基材的锂带收卷。
其中，S100中的选料步骤具体可包括：利用显微镜或放大镜观察锂带的表面，剔除含有杂质、气泡的锂带，从而挑选出合格的待辊压锂带。
在一实施例中，S100中的锂带的厚度范围可以为30-1000μm，即合格的待辊压锂带的厚度范围可以为30-1000μm。
步骤S200可使锂带整体的硬度达到所需的软硬度，并且能够防止待辊压锂带在辊压前被氧化，使其能够较长时间保存。在一实施例中，可将合格的待滚压辊压锂带置于干燥房内的钝化箱内进行钝化处理。钝化时间优选时间是5-8h，钝化时间较短，辊压后的锂带表面容易出现氧化现象， 而钝化时间较长，则可能影响设备的产能。
在S300中，第一基材和第二基材可以为高分子膜片、金属膜片以及无机材料膜片中的一种或两种组合。在一实施例中，第一基材和第二基材的厚度可以在1-3000μm之间。第一基材和第二基材可分别采用特氟龙、聚乙烯、聚丙烯、聚氨酯、聚四氟乙烯、聚芳砜、聚对苯二甲酸乙二醇酯、丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺、聚醚砜、铜箔、铝箔、无纺布、格拉辛纸或纤维纸张中的一种或多种的组合制成。并且优选丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺、聚对苯二甲酸乙二醇酯，其材料具有较大的拉伸强度和较好的弹性变形，对于待辊压锂带能够起到较好的缓冲和保护作用。
在S300中，分别对第一基材和第二基材上与待辊压的锂带接触的表面进行表面处理具体包括：
分别对第一基材和第二基材上与待辊压的锂带接触的表面涂布十八烷、十六烷、环己烷、煤油、二甲基硅油、食用油、碳酸二甲酯、三氟丙基甲基环三硅氧烷、二氯乙烷、六甲基二硅氧烷、环五聚二甲基硅氧烷等材料的一种或多种组合，使得第一基材上与待辊压的锂带接触的表面的粗糙度小于第二基材上与待辊压的锂带接触的表面的粗糙度，从而使得第一基材与待辊压的锂带之间的吸附力大于第二基材与待辊压的锂带之间的吸附力。这样，在S500中剥离第二基材过程中，第一基材可以与锂带贴附，而第二基材可以从锂带剥离而不粘锂带。其中，优选的材料为二甲基硅油，环五聚二甲基硅氧烷，其材料在第一基材和第二基材表面能够形成致密的分离层，保证压延锂带能够较好剥离，同时该材料在基材表面可以形成不同表面附着力。
在进行S400之前，可预先调节辊压装置的加热温度、压力、间隙和速度等运动参数；
加热温度范围小于120℃，加热温度过高则容易导致第一基材和第二 基材产生变形，进而导致第一基材和第二基材在辊压过程中出现打皱和破损。并且，温度不宜低于35℃，若加热温度过低，则待辊压锂带可能不能产生较好的延展，达不到预期的厚度要求。
可按照所需厚度的锂带的厚度调节工作辊的压力、速度及间隙。其中，工作辊的压力可以在0.2～1.5MPa之间调节，工作辊的压力优选范围为0.4-1.0MPa，工作辊压力过大，容易导致第一基材和第二基材产生压碎，进而导致待辊压锂带在辊压过程中出现着火风险；而如果工作辊压力过小，则待辊压锂带在辊压过程中可能达不到预期的厚度要求。工作辊的速度可在0.001-60m/min之间调节，优选工作辊速度为1-30m/min，工作辊速度过快，会导致待辊压锂带在辊压过程中出现达不到预期的厚度要求；工作辊速度过慢，则又会导致待辊压锂带在辊压过程中出现达不到产能要求。工作辊之间的间隙可在0-5mm之间调节。其中，优选工作辊间隙为0.01-0.5mm，工作辊间隙过小，容易导致所述第一基材和所述第二基材在辊压过程中被压碎，进而导致所述待辊压锂带在辊压过程中出现着火风险；工作辊间隙过大，所述的待辊压锂带在辊压过程中达不到预期的厚度要求。
在实际生产过程中，两个工作辊可以等速辊压，也可以差速辊压。
当两个工作辊采用等速辊压时，两个工作辊的速度相同，可以为0.001-60m/min，优选为0.1-30m/min。
当两个工作辊采用差速辊压时，两个工作辊中速度慢的工作辊的速度与速度快的工作辊的速度比在0.3％-100％之间，优选速度比在5％-30％之间，两工作辊的速度比如果过小，则可能导致待辊压锂带在辊压过程中出现不连续外观；而两工作辊的速度比如果过大，则又可能导致待辊压锂带在辊压过程中达不到预期的厚度要求。通过两个辊压辊之间不同速度的匹配，可以确保锂带入料时的吃锂量不会随着速度提升而增多，同时可以确保生产效率。
S600的作用在于，可在将第二基材剥离后锂带外露的表面上形成钝化膜，如此，压延后的锂带在剥离掉第二基材后可以快速钝化，从而防止锂带与空气反应。在一实施例中，S600中的钝化时间可以为5-180s。
在一实施例中，所有步骤可在环境温度为10-35℃，湿度为0-20％的条件下进行，以便于对锂带进行辊压操作。
通过上述锂带生产方法可生产出不粘辊、不断带的锂带，锂带的厚度范围可在1-20μm之间，适用于多种超薄锂电池的厚度，从而满足电池企业的需求；而且生产过程对环境污染较小，不存在安全隐患。
下面以具体的例子说明锂带生产方法。
例3
利用低倍显微镜对来料45μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的待辊压锂带置于环境温度30℃，湿度10％的环境下进行钝化处理，钝化时间8h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的第一基材和第二基材，并对第一基材和第二基材表面涂二甲基硅油。其中，第一基材的材质为聚乙烯，第二基材的材质为格拉辛纸，对工作辊进行加热，使工作辊的温度达到80℃，将第一工作辊的速度调为3m/min，将第二工作辊的速度调为30m/min，两个工作辊之间的间隙调节为5μm，气压控制为0.6MPa。将长32mm、宽70mm钝化好的锂带置于第一基材和第二基材之间并送入到轧机辊间完成轧制过程，可得到5μm的锂带，第一基材与锂带之间的附着力为0.12N，第二基材与锂带之间的附着力为0.038N。
例4
利用低倍显微镜对来料100μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度25℃，湿度2％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的两片聚酰亚胺高分子材料制成的第一基材和第 二基材，并对第一基材和第二基材表面涂环己烷。对工作辊进行加热，使工作辊的温度达到80℃，将第一工作辊的速度调为3m/min，将第二工作辊的速度调为3m/min，两个工作辊之间的间隙调节为3μm，气压控制为0.65MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到轧机辊间完成轧制过程，可得到3μm的锂带，第一基材与锂带之间的附着力为0.08N，第二基材与锂带之间的附着力为0.051N。
例5
利用低倍显微镜对来料45μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的待辊压锂带置于环境温度30℃，湿度10％的环境下进行钝化处理，钝化时间8h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的第一基材和第二基材，并在第一基材与第二基材的表面涂覆表面材料。其中，第一基材的材质为丙烯腈-丁二烯-苯乙烯共聚物，所涂覆的表面材料为二甲基硅油；第二基材的材质为聚对苯二甲酸乙二醇酯，所涂覆的表面材料为丙烯酸聚硅氧烷。对工作辊进行加热，使工作辊的温度达到85℃，将第一工作辊的速度调为5m/min，将第二工作辊的速度调为5m/min，两个工作辊之间的间隙调节为10μm，气压控制为0.6MPa。将长32mm、宽70mm钝化好的锂带置于第一基材和第二基材之间并送入到轧机辊间完成轧制过程，可得到10μm的锂带，第一基材与锂带之间的附着力为0.15N，第二基材与锂带之间的附着力为0.045N。
例6
利用低倍显微镜对来料250μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度27℃，湿度1％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的两片格拉辛纸制成的第一基材和第二基材，并对第一基材和第二基材表面涂六甲基二硅氧烷。对工作辊进行加热，使工作辊的温度达到35℃，将慢速工作辊的速度调为10m/min，并将快速工作 辊的速度调为10m/min，将两个工作辊之间的间隙调节为20μm，气压控制为0.45MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到工作辊间完成轧制过程，可得到20μm的锂带，第一基材与锂带之间的附着力为0.07N，第二基材与锂带之间的附着力为0.055N。
例7
利用低倍显微镜对来料250μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度27℃，湿度1％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的两片聚对苯二甲酸乙二醇酯制成的第一基材和第二基材，并对第一基材表面涂覆二甲基硅油，对第二基材表面涂十八烷。对工作辊进行加热，使工作辊的温度达到48℃，将慢速工作辊的速度调为1.5m/min，并将快速工作辊的速度调为20m/min，将两个工作辊之间的间隙调节为15μm，气压控制为0.45MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到工作辊间完成轧制过程，可得到15μm的锂带，第一基材与锂带之间的附着力为0.085N，第二基材与锂带之间的附着力为0.032N。
例8
利用低倍显微镜对来料100μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度25℃，湿度2％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的第一基材和第二基材，并在第一基材与第二基材的表面涂覆表面材料。其中，第一基材的材质为聚氨酯，所涂覆的表面材料为十六烷；第二基材的材质为聚醚砜，所涂覆的表面材料为环五聚二甲基硅氧烷。对工作辊进行加热，使工作辊的温度达到60℃，将慢速工作辊的速度调为3m/min，并将快速工作辊的速度调为30m/min，将两个工作 辊之间的间隙调节为15μm，气压控制为0.2MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到工作辊间完成轧制过程，可得到15μm的锂带，第一基材与锂带之间的附着力为0.09N，第二基材与锂带之间的附着力为0.043N。
例9
利用低倍显微镜对来料100μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度25℃，湿度2％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的第一基材和第二基材，并在第一基材与第二基材的表面涂覆表面材料。其中，第一基材的材质为聚对苯二甲酸乙二醇酯，所涂覆的表面材料为十六烷；第二基材的材质为格拉辛纸，所涂覆的表面材料为二甲基硅油。对工作辊进行加热，使工作辊的温度达到90℃，将慢速工作辊的速度调为15m/min，并将快速工作辊的速度调为60m/min，将两个工作辊之间的间隙调节为15μm，气压控制为0.8MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到工作辊间完成轧制过程，可得到15μm的锂带，第一基材与锂带之间的附着力为0.093N，第二基材与锂带之间的附着力为0.042N。
例10
利用低倍显微镜对来料250μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度27℃，湿度1％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的第一基材和第二基材，并在第一基材与第二基材的表面涂覆表面材料。其中，第一基材的材质为格拉辛纸，所涂覆的表面材料为二甲基硅油；第二基材的材质为聚对苯二甲酸乙二醇酯，所涂覆的表面材料为丙烯酸聚硅氧烷。对工作辊进行加热，使工作辊的温度达到100℃，将慢速工作辊的速度调为0.001m/min，并将快速工作辊的速度调 为3m/min，将两个工作辊之间的间隙调节为10μm，气压控制为1.0MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到工作辊间完成轧制过程，可得到10μm的锂带，第一基材与锂带之间的附着力为0.082N，第二基材与锂带之间的附着力为0.063N。
例11
利用低倍显微镜对来料100μm厚的锂带观察，剔除表面含有杂质的部位，之后把合格的锂带置于环境温度25℃，湿度2％的环境下进行钝化处理，钝化时间4h。通过钝化处理可以使锂带达到统一的软硬度。准备好长500mm、宽为75mm的第一基材和第二基材，并在第一基材与第二基材的表面涂覆表面材料。其中，第一基材的材质为聚酰亚胺，所涂覆的表面材料为环己烷；第二基材的材质为聚对苯二甲酸乙二醇酯，所涂覆的表面材料为六甲基二硅氧烷。对工作辊进行加热，使工作辊的温度达到110℃，将第一工作辊的速度调为0.01m/min，将第二工作辊的速度调为5m/min，两个工作辊之间的间隙调节为7μm，气压控制为1.5MPa。将长为32mm、宽为70mm钝化好的锂带置于第一基材和第二基材之间并送入到轧机辊间完成轧制过程，可得到7μm的锂带，第一基材与锂带之间的附着力为0.11N，第二基材与锂带之间的附着力为0.071N。
在上述实施例中，锂带可以为金属锂带或金属锂合金带。
例3-11所制成的锂带厚度均在20μm以内，并且，第一基材与第二基材之间的附着力普遍存在1-3倍左右的差距，第二基材的剥离过程将会非常顺畅。
综上所述，本发明实施例中的锂带生产设备100和锂带生产方法可具有下列有益效果：
1)本发明实施例中的锂带生产装置和方法可以根据工艺要求选择合适的第一基材及第二基材，能够实现1-20μm锂带的连续生产，不出现粘辊、断带的现象、操作方便、简单、实用性广；
2)本发明实施例中的锂带生产方法对第一基材、第二基材表面进行表面处理如涂布十八烷等，可使第一基材和第二基材的表面在辊压过程中实现不同的润滑效果，同时可确保辊压出的锂带能够很好地与第二基材剥离并确保辊压出的锂带与第一基材贴附；
3)本发明实施例中的锂带生产方法将辊压工艺和对第一基材、第二基材表面进行表面处理如涂布十八烷等即润滑工艺融为一体，可将来料较厚的锂带与第一基材、第二基材一起辊压，之后对第二基材剥离后锂带外露的表面上进行钝化处理，以在锂带表面形成一层钝化膜，防止锂带与空气发生反应，可以实现压延后的锂带直接在空气中收卷；
3)本发明实施例中的锂带生产方法通过调节两个工作辊的速度，使得两个工作辊之间实现不同速度的匹配，一侧的基材如第一基材或第二基材入料较慢，可有效地降低基材的使用成本；通过两个工作辊之间不同速度的匹配，可以确保锂带入料时的吃锂量不会随着速度提升而增多，同时可以确保生产效率。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种锂带生产方法，其特征在于，包括下列原材料：第一基材、第二基材以及待辊压锂带，包括下列步骤：
    辊压：将所述第一基材、所述待辊压锂带以及所述第二基材依次层叠放置并通过辊压装置进行辊压，使三者压合在一起，其中，所述待辊压锂带的两侧分别被所述第一基材以及所述第二基材完全覆盖；
    剥离：将所述第二基材从被所述辊压装置压合在一起的锂带、所述第一基材和所述第二基材中剥离。
  2. 根据权利要求1所述的锂带生产方法，其特征在于，在所述辊压的步骤之前还包括：调节所述辊压装置的加热温度、压力、间隙和速度，具体包括：
    对所述辊压装置中用于辊压的两个工作辊进行加热，所述工作辊的加热温度在35-120℃之间调节；
    将所述工作辊的压力在0.2～1.5MPa之间调节；
    将所述工作辊之间的间隙在0-5mm之间调节；
    将所述工作辊的速度在0.001-60m/min之间调节。
  3. 根据权利要求2所述的锂带生产方法，其特征在于，所述将所述工作辊的速度在0.001-60m/min之间调节进一步包括：
    将两个所述工作辊中速度慢的工作辊的速度与速度快的工作辊的速度比控制在0.3％-100％之间。
  4. 根据权利要求3所述的锂带生产方法，其特征在于，所述两个工作辊中速度慢的工作辊的速度与速度快的工作辊的速度比控制在5％-30％之间。
  5. 根据权利要求1所述的锂带生产方法，其特征在于，
    所述第一基材为高分子膜片、金属膜片或无机材料膜片；
    和/或
    所述第二基材为高分子膜片、金属膜片或无机材料膜片。
  6. 根据权利要求5所述的锂带生产方法，其特征在于，所述第一基材和所述第二基材分别采用特氟龙、聚乙烯、聚丙烯、聚氨酯、聚四氟乙烯、聚芳砜聚对苯二甲酸乙二醇醚、丙烯腈-丁二烯-苯乙烯共聚物、聚酰亚胺或聚醚砜中的一种或多种的组合制成。
  7. 根据权利要求1所述的锂带生产方法，其特征在于，在所述辊压的步骤之前还包括下列步骤：
    表面处理：分别对所述第一基材和所述第二基材上与所述待辊压锂带接触的表面进行表面处理使得所述第一基材与所述待辊压锂带之间的吸附力大于所述第二基材与所述待辊压锂带之间的吸附力。
  8. 根据权利要求7所述的锂带生产方法，其特征在于，所述表面处理的步骤之前还包括：
    预先钝化：将所述待辊压锂带置于干燥房内，将钝化气体喷在所述待辊压锂带外露的表面上进行钝化处理，钝化时间为5-20小时。
  9. 根据权利要求1所述的锂带生产方法，其特征在于，在所述剥离的步骤之后还包括；
    钝化：对所述锂带外露的表面进行钝化处理。
  10. 根据权利要求9所述的锂带生产方法，其特征在于，在所述钝化的步骤之后还包括：
    收卷：将含所述第一基材的锂带收卷。
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