WO2023029641A1 - 压辊装置及补锂设备 - Google Patents

压辊装置及补锂设备 Download PDF

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Publication number
WO2023029641A1
WO2023029641A1 PCT/CN2022/097947 CN2022097947W WO2023029641A1 WO 2023029641 A1 WO2023029641 A1 WO 2023029641A1 CN 2022097947 W CN2022097947 W CN 2022097947W WO 2023029641 A1 WO2023029641 A1 WO 2023029641A1
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WIPO (PCT)
Prior art keywords
lithium
pressing roller
roller
rolling surface
rolling
Prior art date
Application number
PCT/CN2022/097947
Other languages
English (en)
French (fr)
Inventor
陈仕通
谢斌
费新路
李克强
卢毅
赵丰刚
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2023029641A1 publication Critical patent/WO2023029641A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, in particular, to a pressing roller device and lithium replenishment equipment.
  • lithium-ion batteries are widely used in consumer electronics and electric vehicles due to their advantages such as high energy density, long service life, green and pollution-free.
  • SEI film solid electrolyte film
  • the solid electrolyte film will consume part of lithium, resulting in loss of lithium, and the loss of lithium directly leads to the loss of lithium-ion battery capacity.
  • the embodiment of the present application provides a pressing roller device and lithium replenishing and ionizing equipment to improve the quality of lithium replenishing, thereby reducing the possibility of reducing the battery capacity due to lithium loss during the first charging and discharging process of the lithium ion battery.
  • an embodiment of the present application provides a pressing roller device, including a first pressing roller and a second pressing roller.
  • the second pressing roller is used to roll the lithium ribbon in cooperation with the first pressing roller.
  • the first pressing roller includes a first rolling surface for rolling the lithium strip, and the first rolling surface is depressed in a direction close to the axis of the first pressing roller, so that the first The rolling surface compensates for the expansion of the first pressure roller when the first pressure roller rolls and squeezes the lithium ribbon.
  • the first pressing roller is provided with a first pressing roller.
  • a rolling surface is equivalent to having a concave portion on the surface of the first pressure roller, the size of the depression can compensate the thermal expansion of the first pressure roller and the second pressure roller, so that even if the first pressure roller and the second pressure roller After the roller expands, the rolling gap between the first pressure roller and the second pressure roller tends to be consistent, which can improve the uniformity of lithium strip extension and reduce the accumulation of lithium ribbon between the first pressure roller and the second pressure roller. It is too large to affect the risk of lithium belt transmission, so as to improve the quality of lithium supplementation, thereby reducing the possibility of battery capacity reduction due to lithium loss during the first charging and discharging process of lithium-ion batteries.
  • the diameter of the first rolling surface gradually decreases from both ends in the axial direction of the first pressing roll to the middle.
  • the width direction of the lithium ribbon is consistent with the axis direction of the first pressure roller and the axis direction of the second pressure roller, and along the width direction of the lithium ribbon, the closer to the middle of the lithium ribbon, the greater the accumulation amount.
  • the first pressing roller has a first cross section passing through the axis of the first pressing roller, and the first cross section intersects with the first rolling surface to form a Two first intersecting lines, the first intersecting lines are arc lines; the first rolling surface is a turning surface formed by revolving the first intersecting lines around the axis of the first pressing roller.
  • the first rolling surface is a turning surface formed by the arc-shaped first intersecting line turning around the axis of the first pressing roller, so that the first pressing roller rotates around its own axis at any angle, and the first rolling surface rolls
  • the expansion of the first pressure roller is constant, which further improves the uniformity of the lithium ribbon extension and reduces the impact on the transmission of the lithium ribbon due to the excessive accumulation of lithium ribbon between the first roller and the second roller. risks of.
  • the first rolling surface extends to both axial ends of the first pressing roll.
  • the first rolling surface extends to both axial ends of the first pressure roller, if the width dimension of the lithium ribbon does not exceed the axial dimension of the first pressure roller, along the width direction of the lithium ribbon, the first The rolling pressure can completely cover the lithium ribbon, so that the first rolling surface can always compensate the expansion of the first pressing roller when the first pressing roller rolls and squeezes the lithium ribbon.
  • the surface roughness of the first rolling surface is greater than or equal to 0.3 ⁇ m.
  • the surface roughness of the first rolling surface is greater than or equal to 0.3 ⁇ m, so that when the first rolling surface is in contact with the lithium strip, there is a relatively large frictional force between the first rolling surface and the lithium strip, and the friction is large.
  • the force can make the lithium strip passively brought into the gap between the first pressure roller and the second pressure roller, which is beneficial to the transmission of the lithium strip, and can also be rolled longer and more fully in each area of the lithium strip at the microscopic level, thereby improving Insufficient and uneven rolling in the width direction of the lithium strip rolling process.
  • the peripheral surface of the second pressing roller has a second rolling surface, and the second rolling surface is depressed in a direction close to the axis of the second pressing roller, so that The second rolling surface compensates for the expansion of the second pressing roller when the second pressing roller rolls and presses the lithium ribbon.
  • the second pressure roller has a second rolling surface that is concave toward the axis of the second pressure roller, and the second rolling surface compensates for the expansion of the second pressure roller when the second pressure roller rolls and squeezes the lithium strip.
  • the first rolling surface of the first pressure roller and the second rolling surface of the second pressure roller jointly compensate the first pressure roller and the second pressure roller.
  • the expansion amount of the second pressure roller can make the first pressure roller and the second pressure roller have better structural strength under the condition of ensuring the total expansion amount.
  • the maximum depth H 1 of the first rolling surface depression, the maximum depth H 2 of the second rolling surface depression, the width L of the lithium strip, the The maximum diameter D 1 of the first pressure roller and the maximum diameter D 2 of the second pressure roller satisfy the following relationship:
  • H 1 +H 2 5L/((D 1 +D 2 )/2) 2 .
  • the maximum depth of the depressions on the first rolling surface is the same as the maximum depth of the depressions on the second rolling surface.
  • the maximum depth of the depression on the first rolling surface is the same as the maximum depth of the depression on the second rolling surface, so that the first rolling surface and the second rolling surface are rolled and squeezed by the first roller and the second roller.
  • the compensation amount is the same when pressing the lithium ribbon, which is beneficial to improve the uniformity of the lithium ribbon extension.
  • the maximum diameter of one of the first press roll and the second press roll is smaller than the maximum diameter of the other.
  • the maximum diameter of one of the first pressure roller and the second pressure roller is smaller than the maximum diameter of the other, which can not only realize the transmission of the lithium ribbon, but also reduce the volume of the pressure roller device.
  • the diameters of the second pressure rollers are equal; the maximum diameter of the first pressure roller is smaller than the maximum diameter of the second pressure roller.
  • the maximum diameter of the first pressure roller provided with the first rolling surface is smaller than the maximum diameter of the second pressure roller, which is beneficial to improve the problem of insufficient and uneven rolling in the width direction of the lithium strip rolling process, It is also conducive to the transmission of lithium ribbons.
  • the embodiment of the present application provides a lithium supplementation device, including a lithium supply device and the pressing roller device provided in the embodiment of the first aspect.
  • the lithium supply device is used for supplying lithium strips.
  • the press roller device is configured to press the lithium ribbon against the roll.
  • the first pressing roller is provided with a first rolling surface that is sunken toward the axial direction of the first pressing roller, which is equivalent to having a recess on the surface of the first pressing roller, and the size of the recess can compensate for the first pressing roller.
  • the size of the roller and the second pressure roller is thermally expanded, so that even after the expansion of the first pressure roller and the second pressure roller, the rolling gap between the first pressure roller and the second pressure roller tends to be consistent, and the lithium strip can be improved.
  • Fig. 1 is a schematic structural diagram of a lithium supplementation device provided by some embodiments of the present application.
  • Fig. 2 is the first release agent coating device provided by some embodiments of the present application.
  • Fig. 3 is the second release agent coating device provided by some embodiments of the present application.
  • Fig. 4 is a structural schematic diagram of a pressing roller device provided by some embodiments of the present application.
  • Fig. 5 is a schematic structural diagram of a first pressure roller provided in another embodiment of the present application.
  • FIG. 6 is a schematic diagram of rolling a lithium strip by a rolling device provided in some embodiments of the present application.
  • Fig. 7 is a schematic diagram of a first viewing angle of a pressing roller device provided in some further embodiments of the present application.
  • Fig. 8 is a schematic diagram of a second viewing angle of a pressing roller device provided in some further embodiments of the present application.
  • Icons 1000-lithium supplementation equipment; 100-lithium supply device; 200-roller device; 210-first roller; 211-first roller pressing surface; 220-second pressing roller; 221-second roller pressing surface; 230-rolling gap; 240-backup roller; 300-first pre-pressing device; 310-first pre-pressing roller; 320-second pre-pressing roller; 330-pre-pressing gap; 400-first release agent coating Device; 410-back roller; 420 transfer roller; 430-hopper; 440-scraper; 500-second release agent coating device; 510-corrector; 520-first edge coating roller; 530-second edge Coating roller; 540-first edge trough; 550-second edge trough; 600-release agent leak detection device; 700-third release agent coating device; 800-traction device; 810-traction carrier film ; 900-pole piece unwinding device; 1100-pole piece winding device; 1200-cleaning device; 2000-lithium strip; 3000-pole piece; A-thickness direction of lithium
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the application is used, or the orientation or positional relationship of this application.
  • the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of the application is usually placed when it is used is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must be Having a particular orientation, being constructed and operating in a particular orientation, and therefore not to be construed as limiting the application.
  • the terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.
  • Lithium batteries are widely used in aerospace, computers, mobile communication equipment, robots and electric vehicles due to their advantages of high energy density, long cycle life and wide temperature range.
  • SEI film solid electrolyte film
  • the solid electrolyte film will consume part of the lithium, resulting in loss of lithium, and the loss of lithium will directly lead to the loss of lithium ion battery capacity.
  • the lithium-ion battery pole piece lithium replenishment process is generally used to supplement the consumed lithium and increase the capacity of the lithium battery.
  • the inventors have found that during the process of rolling the lithium ribbon by the pressing roller device, along the width direction of the lithium ribbon, the central region of the lithium ribbon is prone to accumulation on both sides of the width direction, which is likely to cause jamming and thus affect the transmission of the lithium ribbon, and the lithium ribbon
  • the heat dissipation capacity of the middle area of the belt is poor relative to the areas on both sides of the width direction, so that the position of the pressure roller corresponding to the middle area of the lithium belt is easy to be heated and expanded, so that the gap between the pressure rollers becomes smaller, resulting in the extension thickness of the middle area of the lithium belt relative to the width
  • the thickness on both sides of the direction is smaller, so that the lithium ribbon stretches unevenly.
  • an embodiment of the present application provides a pressing roller device, including a first pressing roller and a second pressing roller that cooperate to roll the lithium belt, through
  • the first pressing roller is provided with a first rolling surface that is sunken toward the axial direction of the first pressing roller, so that the first rolling surface compensates for the expansion of the first pressing roller when the first pressing roller rolls and squeezes the lithium strip, Equivalent to having a recess on the surface of the first press roller, the size of the recess can compensate the size of the thermal expansion of the first press roller and the second press roller, so that even after the expansion of the first press roller and the second press roller, the first press roller The rolling gap between the first pressure roller and the second pressure roller tends to be consistent, which can improve the uniformity of lithium strip extension and reduce the impact caused by the excessive accumulation of lithium ribbon between the first pressure roller and the second pressure roller 220. Lithium Ribbon Transmission Risks.
  • the pressing roller device provided in the embodiment of the present application can not only be used in the field of battery manufacturing technology, but also can be used in other fields that require the pressing roller device to participate in the rolling operation.
  • the use of the pressing roller device in the lithium supplementation process in the technical field of battery manufacturing is taken as an example to introduce the pressing roller device.
  • the embodiment of the present application provides a lithium supplementation device 1000 , including a lithium supply device 100 and a pressing roller device 200 .
  • the lithium supply device 100 is used for supplying a lithium ribbon 2000 .
  • the pressing roller device 200 is configured to press the lithium ribbon 2000 on the rolling side.
  • the lithium replenishing device 1000 also includes a first pre-compression device 300, the first pre-compression device 300 is disposed downstream of the lithium supply device 100, and the first pre-compression device 300 is disposed upstream of the pressure roller device 200,
  • the first pre-compression device 300 includes a first pre-compression roller 310, a second pre-compression roller 320 and a first frame (not shown in the figure), and the first pre-compression roller 310 and the second pre-compression roller 320 can rotate Arranged on the first frame, a pre-compression gap 330 is formed between the outer peripheral surface of the first pre-compression roller 310 and the outer peripheral surface of the second pre-compression roller 320, and the pre-compression gap 330 is used for passing the lithium belt 2000.
  • a pre-compression roller 310 and a second pre-compression roller 320 cooperate to flatten the surface of the lithium ribbon 2000 before the roller device 200 rolls the lithium ribbon 2000 .
  • the axial direction of the first pre-compression roller 310 is consistent with the axial direction of the second pre-compression roller 320
  • the axial direction of the first pre-compression roller 310 and the second pre-compression roller 320 are consistent with the width direction B of the lithium ribbon.
  • upstream and downstream refer to the sequence of production, upstream refers to the production sequence first, and downstream refers to the production sequence later.
  • upstream and downstream refers to the production sequence later.
  • the spatial positions between the components are not limited.
  • the lithium replenishing device 1000 also includes a first release agent coating device 400, the first release agent coating device 400 is located downstream of the first pre-pressing device 300, and the first release agent coating device 400 is located upstream of the pressing roller device 200, and the first release agent coating device 400 is used to apply a release agent to both surfaces in the thickness direction A of the lithium ribbon.
  • the lithium replenishing device 1000 also includes a second release agent coating device 500, the second release agent coating device 500 is located downstream of the first pre-pressing device 300, and the second release agent coating device 500 is located upstream of the pressure roller device 200, and the second release agent coating device 500 is used to apply a release agent to both surfaces of the lithium ribbon in the width direction B.
  • the lithium replenishment equipment 1000 also includes a release agent leak detection device 600 and a third release agent coating device 700, and the release agent leak detection device 600 and the third release agent coating device 700 are both Located downstream of the second release agent coating device 500, the release agent leak detection device 600 is used to detect whether the lithium belt 2000 has a missing coating release agent position, and the third release agent coating device 700 is used for releasing The mold agent missing detection device 600 detects the signal and applies the release agent to the position where the lithium belt 2000 is missing the mold release agent.
  • the hollow arrows in the illustrations correspond to the possible rotation directions of the rollers.
  • the first release agent coating device 400 includes a back roller 410 , a transfer roller, a trough 430 and a scraper 440 .
  • the back roller 410 and the transfer roller are respectively located on both sides of the thickness direction A of the lithium ribbon, the axial direction of the back roller 410 is consistent with the axial direction of the transfer roller, and the axial direction of the back roller 410 and the axial direction of the transfer roller are both the same as the width of the lithium ribbon.
  • the direction B is the same, the lithium belt 2000 passes between the back roller 410 and the transfer roller, the release agent is added to the trough 430, the thickness of the release agent on the transfer roller is controlled by the scraper 440, the lithium belt 2000 contacts the transfer roller, and the surface of the transfer roller
  • the release agent adheres to the surface of the lithium belt 2000 to realize the coating of the release agent on the surface of the lithium belt 2000; the detection device 600 of the leak detection device 600 of the release agent on the surface of the lithium belt 2000 passes the CCD (Charge-coupled Device, charge-coupled device or image controller), etc.
  • CCD Charge-coupled Device, charge-coupled device or image controller
  • the second release agent coating device 500 includes a deviation corrector 510, a first edge coating roller 520, a second edge coating roller 530, a first edge trough 430 and a second edge coating roller 530.
  • Two edge troughs 550 are respectively located on both sides of the lithium strip 2000 in the width direction, the axis direction of the first edge coating roller 520 is consistent with the axis direction of the second edge coating roller 530, and the second edge coating roller 530 has the same axis direction.
  • the axis direction of an edge coating roller 520 and the axis direction of the second edge coating roller 530 are all perpendicular to the width direction B of the lithium strip, and the lithium strip 2000 passes between the first edge coating roller 520 and the second edge coating roller 530 .
  • the lithium strip 2000 passes through the first edge coating roller 520, the lithium strip 2000 passes through the second edge coating roller 530, the first edge trough 430 and the second edge trough 550 add a release agent, the first edge coating roller 520 and
  • the second edge coating roller 530 can be designed as a grooved roller, and the grooved roller passes through the first edge trough 430 and the second edge trough 550, and the first edge trough 430 and the second edge trough 550 can be removed.
  • the molding agent is taken out, and the lithium belt 2000 passes through the first edge coating roller 520 and the second edge coating roller 530, and removes the grooves in the grooves of the first edge coating roller 520 and the second edge coating roller 530.
  • the molding agent is coated on the surfaces of both sides of the lithium ribbon in the width direction B to realize edge coating of the lithium ribbon 2000 .
  • the lithium supplementary device 1000 also includes a traction device 800, the traction device 800 is used to wind up or release the traction carrier film 810, and one end of the traction carrier film 810 is connected to one end of the lithium ribbon 2000. connected, when the pulling device 800 winds and pulls the carrier film 810 , the lithium supply device 100 releases the lithium ribbon 2000 .
  • the lithium replenishment equipment 1000 is used to replenish lithium to the pole piece 3000. Therefore, the lithium supplement equipment 1000 also includes a pole piece unwinding device 900 and a pole piece winding device 1100.
  • the pole piece unwinding device 900 is used to release the pole piece 3000, the pole piece The winding device 1100 is used for winding the pole piece 3000 released by the pole piece unwinding device 900 .
  • the pole piece unwinding device 900 unwinds the pole piece 3000 through the pressure roller device 200, and the ultra-thin lithium ribbon 2000 rolled by the pressure roller device 200 can be transferred to the bottom of the pole piece 3000 under the rotation of the pressure roller of the pressure roller device 200.
  • the surface in the thickness direction finally achieves the function of simultaneously adhering the ultra-thin lithium strip 2000 on both sides of the pole piece 3000 to realize the lithium supplementation of the pole piece 3000.
  • the lithium replenishment equipment 1000 also includes a cleaning device 1200 and a dust suction device (not shown in the figure), and the cleaning device 1200 is used to clean the residual lithium debris and residual lithium scraps that are not completely transferred to the surface of the pole piece 3000 from the surface of the pressing roller of the pressing roller device 200. Release agent.
  • the cleaning device 1200 may include a scraper blade for scraping off residual lithium shavings and residual mold release agent that are not completely transferred from the surface of the pressing roller of the pressing roller device 200 to the surface of the pole piece 3000 .
  • Dust suction devices are provided on both sides of the cleaning device 1200 for absorbing and collecting the residual lithium film cleaned by the cleaning device 1200 .
  • the pressing roller device 200 includes a first pressing roller 210 and a second pressing roller 220 .
  • the second pressing roller 220 is used to cooperate with the first pressing roller 210 to roll the lithium ribbon 2000 .
  • the first pressing roller 210 includes a first rolling surface 211 for rolling the lithium ribbon 2000, and the first rolling surface 211 is recessed in a direction close to the axis of the first pressing roller 210, so that the first rolling surface 211 The expansion of the first pressing roller 210 is compensated when the first pressing roller 210 rolls and squeezes the lithium ribbon 2000 .
  • the pressure roller device 200 also includes a second frame (not shown in the figure), the first pressure roller 210 and the second pressure roller 220 can be rotatably arranged on the second frame, the first pressure roller 210 and the second pressure roller 220 are respectively located on both sides of the thickness direction A of the lithium ribbon, and form a rolling gap 230, and the lithium ribbon 2000 is rolled by the first pressure roller 210 and the second pressure roller 220 during the process of passing through the rolling gap 230.
  • the axial direction of the first pressing roller 210 is consistent with the axial direction of the second pressing roller 220, the axial direction of the first pressing roller 210, the axial direction of the second pressing roller 220 and the width direction B of the lithium strip (shown in FIG. 3 ) Consistently, the thickness direction of the pole piece 3000 is perpendicular to the width direction of the pole piece 3000 .
  • the rotation directions of the first pressing roller 210 and the second pressing roller 220 are opposite.
  • the rolling device 200 can roll the lithium strip 2000 by hot rolling or cold rolling.
  • hot roll rolling the temperature of the first pressure roller 210 and the second pressure roller 220 can be kept between 30°C and 40°C, mainly to soften the lithium strip 2000, which is conducive to uniform rolling of the lithium strip in the width direction B , It is also beneficial to reduce the poor rolling defects such as wire drawing formed by the partial lithium rolling that is not opened due to the unsoftened rolling of the lithium strip 2000 hard particles during the rolling process.
  • the temperature of the first pressure roller 210 and the second pressure roller 220 can not be too high, the temperature is too high (such as the temperature of the first pressure roller 210 and the second pressure roller 220 exceeds 45 °), the ignition point of the lithium ribbon 2000 is 180 ° C, Excessive temperature of the hot roller may cause spontaneous combustion of the rolled ultra-thin lithium strip 2000; the temperature of the first pressing roller 210 and the second pressing roller 220 is ⁇ 50°C, and it is difficult to control the rebound of the hot roller at high temperature.
  • the cold roll rolling method (such as the temperature of the first press roll 210 and the second press roll 220 ⁇ 20°C) can reduce the risk of inconsistency in the roll heating rebound during the hot roll rolling process; at the same time, the cold roll roll It reduces the requirements for equipment heating rebound, which can significantly reduce the manufacturing difficulty of pressing rolls and reduce the manufacturing cost of pressing rolls.
  • cold rolling can quickly cool down the high-speed rolled lithium strip 2000, thereby reducing the lithium strip 2000. Risk of fire and spontaneous combustion.
  • the opposite sides of the central part of the lithium ribbon 2000 are easy to form accumulations, and the heat dissipation capacity of the central region of the lithium ribbon 2000 is poor relative to the regions on both sides of the width direction, making the lithium
  • the position of the pressure roller corresponding to the middle region of the belt 2000 is easily heated and expanded, so that the gap between the first pressure roller 210 and the second pressure roller 220 corresponding to the middle region of the lithium belt 2000 becomes smaller, resulting in the extension of the thickness relative to the width of the middle region of the lithium belt 2000
  • the thickness of the areas on both sides of the direction is smaller, so that the extension of the lithium ribbon 2000 is uneven.
  • the first rolling surface 211 that is depressed in the axial direction of the roller 210 is equivalent to having a concave portion on the surface of the first pressure roller 210, and the size of the depression can compensate for the thermal expansion of the first pressure roller 210 and the second pressure roller 220, Even after the expansion of the first pressure roller 210 and the second pressure roller 220, the rolling gap 230 between the first pressure roller 210 and the second pressure roller 220 tends to be consistent, which can improve the uniformity and stability of the extension of the lithium ribbon 2000. The risk of affecting the transmission of the lithium ribbon 2000 due to excessive accumulation of the lithium ribbon 2000 between the first pressing roller 210 and the second pressing roller 220 is reduced.
  • the middle area of the lithium ribbon 2000 is easy to pile up because the feeding speed in the middle area of the lithium ribbon 2000 is too small.
  • the gap between the pressing rollers corresponding to the middle area of the lithium ribbon 2000 can be increased, and the unit time can be increased. Lithium strip 2000 input quantity, thus solving the lithium strip 2000 high-speed rolling accumulation problem.
  • the setting of the first rolling surface 211 can significantly reduce the risk of lithium strip 2000 stacking, thereby reducing the tension of lithium strip 2000 (conventional rollers need a large tension to force the middle area of lithium strip 2000 as much as possible, thereby slowing down the rolling and accumulation of lithium strip 2000 ), but the high tension of the lithium ribbon 2000 will directly lead to severe tensile deformation of the edge region of the lithium ribbon in the width direction B, resulting in poor consistency in the width of the lithium film rolled out of the lithium ribbon 2000, affecting the rolled lithium ribbon 2000 and the pole piece 3000 between lamination control, thereby affecting the electrical performance, the setting of the first roller pressing surface 211 compensates the expansion of the first pressing roller 210 when rolling the lithium ribbon 2000, thereby improving the uniformity of the extension of the lithium ribbon 2000 to improve the compensation Lithium quality, thereby reducing the possibility of a decrease in battery capacity due to lithium loss during the first charge and discharge of a lithium-ion battery.
  • the width direction B of the lithium ribbon is consistent with the axis direction of the first pressure roller 210 and the axis direction of the second pressure roller 220.
  • the diameter of the first rolling surface 211 gradually decreases from both ends in the axial direction of the first pressing roller 210 to the middle.
  • the first rolling surface 211 includes two conical surfaces , the small ends of the two conical surfaces are connected.
  • the first pressing roller 210 has a first cross-section passing through the axis of the first pressing roller 210, and the first cross-section intersects with the first rolling surface 211 to form two first intersection lines.
  • One intersection line is an arc line; the first rolling surface 211 is a turning surface formed by rotating the first intersection line around the axis of the first pressing roller 210 .
  • the midpoint of the first intersection line is located on the vertical plane of the first pressure roller 210, wherein, the vertical plane of the first pressure roller 210 is perpendicular to the axis of the first pressure roller 210, the second A pressing roller 210 includes a first shaft section and a second shaft section arranged symmetrically with respect to the vertical plane of the first pressing roller 210, and the first rolling surface formed by the rotation of the first intersecting line around the axis of the first pressing roller 210 211 includes a first portion and a second portion symmetrically arranged with respect to the mid-vertical plane of the first pressing roller 210 .
  • the first rolling surface 211 is a turning surface formed by the arc-shaped first intersection line turning around the axis of the first pressing roller 210, so that the first pressing roller 210 rotates at any angle around its own axis, and the first rolling surface 211 rolls and squeezes.
  • the amount of expansion of the first press roller 210 is constant, which further improves the uniformity of the extension of the lithium strip 2000 and reduces the excessive accumulation of the lithium strip 2000 between the first press roller 210 and the second press roller 220. And affect the risk of lithium belt 2000 transmission.
  • the diameter of the first rolling surface 211 gradually decreases from both ends in the axial direction of the first pressing roller 210 to the middle, and the amount that can be compensated corresponds to the expansion of the first pressing roller 210, further improving the uniformity of the extension of the lithium ribbon 2000 And reduce the risk of affecting the transmission of the lithium ribbon 2000 due to the excessive accumulation of the lithium ribbon 2000 between the first pressing roller 210 and the second pressing roller 220 .
  • the first rolling surface 211 extends to both axial ends of the first pressing roller 210 .
  • the first rolling surface 211 extends to both ends of the first pressing roller 210 in the axial direction
  • the two ends of the first pressing roller 210 can exceed the two ends of the first rolling surface 211, and the first rolling surface 211 is the first rolling surface 211.
  • a part of the outer peripheral surface of the pressure roller 210 is a part of the outer peripheral surface of the pressure roller 210 .
  • the first rolling surface 211 extends to both axial ends of the first pressing roller 210. If the width dimension of the lithium ribbon 2000 does not exceed the axial dimension of the first pressing roller 210, along the width direction B of the lithium ribbon, the first The rolling can completely cover the lithium ribbon 2000 , so that the first rolling surface 211 can always compensate the expansion of the first pressing roller 210 when the first pressing roller 210 rolls and squeezes the lithium ribbon 2000 .
  • the surface roughness of the first rolling surface 211 is greater than or equal to 0.3 ⁇ m.
  • the purpose of making the surface roughness of the first rolling surface 211 reach a certain level is to ensure that the first rolling surface 211 will not slip when in contact with the lithium ribbon 2000 .
  • the surface roughness of the first rolling surface 211 is greater than or equal to 0.3 ⁇ m, so that when the first rolling surface 211 is in contact with the lithium ribbon 2000, there is a relatively large frictional force between the first rolling surface 211 and the lithium ribbon 2000.
  • the force can make the lithium strip 2000 passively brought into the gap between the first pressing roller 210 and the second pressing roller 220, which is beneficial to the transmission of the lithium strip 2000, and can also be rolled for a longer period of time in each area of the lithium strip 2000 at the microscopic level. Sufficient, so that the problem of insufficient and uneven rolling in the width direction of the lithium strip 2000 rolling process can be improved.
  • the peripheral surface of the second pressing roller 220 has a second rolling surface 221, and the second rolling surface 221 is recessed toward the direction close to the axis of the second pressing roller 220, so that the second pressing roller 220
  • the two-roll pressing surface 221 compensates for the expansion of the second pressing roller 220 when the second pressing roller 220 rolls and presses the lithium ribbon 2000 .
  • the axial dimension of the first pressing roller 210 and the axial dimension of the second pressing roller 220 may be equal or unequal.
  • the axial dimension of the first rolling surface 211 and the axial dimension of the second rolling surface 221 may be equal or unequal.
  • the second pressing roller 220 has a second rolling surface 221 that is concave toward the axis of the second pressing roller 220 , and the second rolling surface 221 compensates for the pressure of the second pressing roller 220 when the second pressing roller 220 rolls and squeezes the lithium ribbon 2000 .
  • the first rolling surface 211 of the first pressure roller 210 and the second rolling surface 221 of the second pressure roller 220 Jointly compensating the expansion of the first pressure roller 210 and the second pressure roller 220 can make the first pressure roller 210 and the second pressure roller 220 have better structural strength under the condition of ensuring the total expansion.
  • the structure of the second rolling surface 221 can refer to the first rolling surface 211 .
  • the width direction B of the lithium ribbon is consistent with the axis direction of the first pressure roller 210 and the axis direction of the second pressure roller 220.
  • the diameter of the second press surface 221 is from the axial direction of the second press roller 220 It gradually decreases from both ends to the middle.
  • the second rolling surface 221 includes two conical surfaces , the small ends of the two conical surfaces are connected.
  • the second pressing roller 220 has a second cross section passing through the axis of the second pressing roller 220, and the second cross section intersects with the second rolling surface 221 to form two second intersection lines.
  • the two intersecting lines are arc lines;
  • the second pressing surface is a turning surface formed by revolving the second intersecting line around the axis of the second pressing roller 220 .
  • the midpoint of the second intersection line is located on the vertical plane of the second pressure roller 220, wherein, the vertical plane of the second pressure roller 220 is perpendicular to the axis of the second pressure roller 220, the second The second pressing roller 220 includes a third shaft section and a fourth shaft section arranged symmetrically with respect to the vertical plane of the second pressing roller 220, and the second rolling surface formed by the second intersection line turning around the axis of the second pressing roller 220 221 includes a third portion and a fourth portion symmetrically disposed with respect to the middle vertical plane of the second pressing roller 220 .
  • the midpoint of the second intersecting line and the midpoint of the first intersecting line lie on the same plane.
  • the second rolling surface 221 is a turning surface formed by the arc-shaped second intersection line turning around the axis of the second pressing roller 220, so that the second pressing roller 220 rotates at any angle around its own axis, and the second rolling surface 221 rolls and squeezes.
  • the amount of expansion of the second press roller 220 is constant, which further improves the uniformity of the extension of the lithium strip 2000 and reduces the excessive accumulation of the lithium strip 2000 between the first press roller 210 and the second press roller 220. And affect the risk of lithium belt 2000 transmission.
  • the diameter of the second rolling surface 221 gradually decreases from both ends in the axial direction of the second pressing roller 220 to the middle, and the amount that can be compensated corresponds to the expansion of the second pressing roller 220, further improving the uniformity of the extension of the lithium ribbon 2000 And reduce the risk of affecting the transmission of the lithium ribbon 2000 due to the excessive accumulation of the lithium ribbon 2000 between the first pressing roller 210 and the second pressing roller 220 .
  • the second rolling surface 221 extends to two axial ends of the second pressing roller 220 .
  • the second rolling surface 221 extends to both ends of the second pressing roller 220 in the axial direction” means that, along the axial direction of the second pressing roller 220 , the two ends of the second rolling surface 221 and the ends of the second pressing roller 220 The two ends are flush, which can also be understood that the outer peripheral surface of the second pressing roller 220 is the second rolling surface 221 . In some other embodiments, along the axial direction of the second pressure roller 220, the two ends of the second pressure roller 220 can exceed the two ends of the second rolling surface 221, and the second rolling surface 221 is the outer periphery of the second pressure roller 220 face part.
  • the second rolling surface 221 extends to both axial ends of the second pressing roller 220. If the width dimension of the lithium ribbon 2000 does not exceed the axial dimension of the second pressing roller 220, along the width direction B of the lithium ribbon, the second The rolling can completely cover the lithium ribbon 2000 , so that the first rolling surface 211 can always compensate the expansion of the first pressing roller 210 when the first pressing roller 210 rolls and squeezes the lithium ribbon 2000 .
  • the surface roughness of the second rolling surface 221 is greater than or equal to 0.3 ⁇ m.
  • the purpose of making the surface roughness of the second rolling surface 221 reach a certain level is to ensure that the second rolling surface 221 will not slip when in contact with the lithium ribbon 2000 .
  • the surface roughness of the second rolling surface 221 is greater than or equal to 0.3 ⁇ m, so that when the second rolling surface 221 is in contact with the lithium ribbon 2000, there is a relatively large frictional force between the second rolling surface 221 and the lithium ribbon 2000.
  • the force can make the lithium strip 2000 passively brought into the gap between the first pressing roller 210 and the second pressing roller 220, which is beneficial to the transmission of the lithium strip 2000, and can also be rolled for a longer period of time in each area of the lithium strip 2000 at the microscopic level. Sufficient, so that the problem of insufficient and uneven rolling in the width direction of the lithium strip 2000 rolling process can be improved.
  • the maximum depth H 1 of the depression on the first rolling surface 211 , the maximum depth H 2 of the depression on the second rolling surface 221 , the width L of the lithium ribbon 2000 , the maximum diameter D 1 of the first pressure roller 210 , The maximum diameter D 2 of the second pressure roller 220 satisfies the following relationship: H 1 +H 2 5L/((D 1 +D 2 )/2) 2 .
  • the maximum depth H1 of the depression of the first rolling surface 211 refers to the position between the position where the diameter of the first pressing roller 210 is the largest and the position where the first rolling surface 211 is closest to the axis of the first pressing roller 210 is between the position of the first pressing roller 210 radial distance.
  • the maximum depth H2 of the second rolling surface 221 depression refers to the position between the second pressing roller 220 and the second rolling surface 221 closest to the axis of the second pressing roller 220 from the position where the diameter of the second pressing roller 220 is the largest. radial distance.
  • the total expansion of the roller 210 and the second pressure roller 220 is matched, so as to effectively improve the problem of insufficient and uneven rolling in the width direction of the lithium strip 2000 during the rolling process.
  • the maximum depth of the depression of the first rolling surface 211 is the same as the maximum depth of the depression of the second rolling surface 221 .
  • the maximum depth position of the depression of the first rolling surface 211 is aligned with the maximum depth position of the depression of the second rolling surface 221, in other words, the maximum depth position of the depression of the first rolling surface 211 is aligned with the maximum depth position of the depression of the second rolling surface 221.
  • the distance of the depth position along the axial direction of the first pressure roller 210 is 0.
  • the maximum depth of the depression of the first rolling surface 211 is the same as the maximum depth of the depression of the second rolling surface 221, so that the first rolling surface 211 and the second rolling surface 221 roll on the first pressing roller 210 and the second pressing roller 220
  • the compensation amount is the same when extruding the lithium ribbon 2000, which is beneficial to improve the uniformity of the lithium ribbon 2000 extension.
  • the maximum diameter of one of the first press roller 210 and the second press roller 220 is smaller than the maximum diameter of the other.
  • the maximum diameter of the first pressure roller 210 and the maximum diameter of the second pressure roller 220 may be equal.
  • the maximum diameter of one of the first pressing roller 210 and the second pressing roller 220 is smaller than that of the other, which can not only realize the transmission of the lithium ribbon 2000 but also reduce the volume of the pressing roller device 200 .
  • the diameters of the second pressure roller 220 are equal; the maximum diameter of the first pressure roller 210 is smaller than the maximum diameter of the second pressure roller 220 .
  • the maximum diameter of the first pressure roller 210 provided with the first rolling surface 211 is smaller than the maximum diameter of the second pressure roller 220, which helps to improve the problem of insufficient and uneven rolling in the width direction of the lithium strip 2000 in the rolling process, and also It is beneficial to the transmission of the lithium belt 2000.
  • the pressure roller device 200 further includes a support roller 240 , and the support roller 240 is fixedly installed on the second bracket.
  • the first supporting roller 240 is disposed on a side of the first pressing roller 210 away from the second pressing roller 220 to provide radial support for the first pressing roller 210 .
  • the first supporting roller 240 may be disposed on a side of the second pressing roller 220 away from the first pressing roller 210 to provide radial support for the second pressing roller 220 .
  • some embodiments of the present application provide a pressing roller device 200
  • the pressing roller device 200 includes a first pressing roller 210 and a second pressing roller 220
  • the surface of the first pressing roller 210 has a first rolling surface 211
  • the first rolling surface 211 is a turning surface in which the arc-shaped first intersecting line revolves around the axis of the first pressure roller 210
  • the first rolling surface 211 extends to both ends of the first pressure roller 210 in the axial direction
  • the second The surface of pressure roller 220 has the second rolling surface 221, and the second rolling surface 221 is the turning surface that the second intersecting line of circular arc turns around the axis of the second pressure roller 220, and the second rolling surface 221 extends to the second rolling surface.
  • the two ends of the two pressure rollers 220 in the axial direction.
  • the embodiment of the present application also provides a lithium replenishment device 1000, which includes a lithium supply device 100 and a pressing roller device 200 provided in any of the above embodiments.
  • the lithium supply device 100 is used for supplying a lithium ribbon 2000 .
  • the pressing roller device 200 is configured to press the lithium ribbon 2000 on the rolling side.
  • the first pressing roller 210 is provided with a first rolling surface 211 that is sunken toward the axial direction of the first pressing roller 210, which is equivalent to having a recess on the surface of the first pressing roller 210, and the size of the recess can compensate for the first pressing roller.
  • the 210 and the second pressure roller 220 are thermally expanded so that even after the first pressure roller 210 and the second pressure roller 220 expand, the rolling gap 230 between the first pressure roller 210 and the second pressure roller 220 tends to Consistent, can improve the uniformity of the extension of the lithium ribbon 2000 and reduce the risk of affecting the transmission of the lithium ribbon 2000 due to the excessive accumulation of the lithium ribbon 2000 between the first press roller 210 and the second press roller 220, thereby improving the polarity of the pole piece 3000 quality of lithium supplementation.

Abstract

本申请提供了一种压辊装置及补锂设备，压辊装置包括第一压辊和第二压辊。第二压辊用于与第一压辊配合辊压锂带。第一压辊包括用于辊压锂带的第一辊压面，第一辊压面向靠近第一压辊的轴线的方向凹陷，以使第一辊压面在第一压辊滚动挤压锂带时补偿第一压辊的膨胀量。第一压辊设有向靠近第一压辊的轴线方向凹陷的第一辊压面，相当于在第一压辊的表面设有一个凹部，凹陷的尺寸能够补偿第一压辊和第二压辊受热膨胀的尺寸，以使即使在第一压辊和第二压辊膨胀后，第一压辊和第二压辊之间的辊压间隙趋于一致，能够提高锂带延展的均匀性和降低因在第一压辊和第二压辊之间锂带堆积量过大而影响锂带传送的风险。

Description

压辊装置及补锂设备
相关申请的交叉引用
本申请本申请要求享有于2021年08月30日提交的名称为“压辊装置及补锂设备”的中国专利申请202122069370.9的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，具体而言，涉及一种压辊装置及补锂设备。
背景技术
目前，锂离子电池由于能量密度高、使用寿命长、绿色无污染等优势被广泛应用于消费类电子产品和电动汽车领域。然而锂离子电池在首次充放电过程中会形成固体电解质膜(SEI膜)，而固体电解质膜会消耗部分锂，造成锂的损失，且此锂的损失直接导致锂离子电池容量的损失。
因此，如何弥补由于锂离子电池在首次充放电过程中的锂损失导致电池容量的降低，成为电池技术领域亟待解决的问题。
发明内容
本申请实施例提供一种压辊装置及补锂离设备，以提高补锂质量，从而降低由于锂离子电池在首次充放电过程中的锂损失导致电池容量的降低的可能性。
第一方面，本申请实施例提供一种压辊装置，包括第一压辊和第二压辊。所述第二压辊用于与所述第一压辊配合辊压锂带。其中，所述第一压辊包括用于辊压所述锂带的第一辊压面，所述第一辊压面向靠近所述第一压辊的轴线的方向凹陷，以使所述第一辊压面在所述第一压辊滚动挤压所述锂带时补偿所述第一压辊的膨胀量。
上述技术方案中，在对辊压锂带的过程中，沿锂带的宽度方向，锂带中部相对两侧容易形成堆积，且锂带中部区域相对宽度方向两侧的区域的散热能力差，使得锂带的中部区域对应的压辊位置容易受热膨胀，使得锂带中部区域对应的第一压辊和第二压辊之间的间隙变小，导致锂带中部区域延展厚度相对宽度方向的两侧的区域的厚度更小，从而使锂带延展不均匀，当堆积量过大还会出现卡带从而影响锂带的传送，因此第一压辊设有向靠近第一压辊的轴线方向凹陷的第一辊压面，相当于在第一压辊的表面设有一个凹部，凹陷的尺寸能够补偿第一压辊和第二压辊受热膨胀的尺寸，以使即使在第一压辊和第二压辊膨胀后，第一压辊和第二压辊之间的辊压间隙趋于一致，能够提高锂带延展的均匀性和降低因在第一压辊和第二压辊之间锂带堆积量过大而影响锂带传送的风险，以提高补锂质量，从而降低由于锂离子电池在首次充放电过程中的锂损失导致电池容量的降低的可能性。
在本申请第一方面的一些实施例中，所述第一辊压面的直径从在所述第一压辊的轴线方向两端至中间逐渐减小。
上述技术方案中，实际辊压过程中，锂带的宽度方向与第一压辊的轴线方向和第二压辊的轴线方向一致，沿锂带的宽度方向，越靠近锂带的中间堆积量越大，散热能力越差，第一压辊和第二压辊受热膨胀量越大，因此，第一辊压面的直径从在第一压辊的轴线方向两端至中间逐渐减小，能够补偿的量与第一压辊的膨胀量相对应，进一步提高锂带延展均匀性和降低因在第一压辊和第二压辊之间锂带堆积量过大而影响锂带传送的风险。
在本申请第一方面的一些实施例中，所述第一压辊具有经过所述第一压辊的轴线的第一横截面，所述第一横截面与所述第一辊压面相交形成两条第一相交线，所述第一相交线为圆弧线；所述第一辊压面为所述第一相交线绕所述第一压辊的轴线回转形成的回转面。
上述技术方案中，第一辊压面为圆弧形的第一相交线绕第一压辊的轴线回转形成的回转面，使得第一压辊绕自身轴线转动任何角度，第一辊压面滚动挤压锂带时补偿第一压辊的膨胀量是 恒定的，进一步提高锂带延展均匀性和降低因在第一压辊和第二压辊之间锂带堆积量过大而影响锂带传送的风险。
在本申请第一方面的一些实施例中，所述第一辊压面延伸至所述第一压辊的轴向的两端。
上述技术方案中，第一辊压面延伸至第一压辊的轴向的两端，若是锂带的宽度尺寸不超过第一压辊的轴向尺寸，则沿锂带的宽度方向，第一辊压能够完全覆盖锂带，使得第一辊压面始终能够在第一压辊滚动挤压锂带时补偿第一压辊的膨胀量。
在本申请第一方面的一些实施例中，所述第一辊压面的表面粗糙度大于等于0.3μm。
上述技术方案中，第一辊压面的表面粗糙度大于等于0.3μm，使得第一辊压面与锂带接触时，第一辊压面与锂带之间具有较大的摩擦力，大摩擦力可以使锂带被动带入第一压辊和第二压辊之间间隙，有利于锂带的传送，且还能在微观层面锂带每个区域被轧制更久更充分，从而可改善锂带辊压过程宽度方向的轧制不充分和不均一问题。
在本申请第一方面的一些实施例中，所述第二压辊的周面具有第二辊压面，所述第二辊压面向靠近所述第二压辊的轴线的方向凹陷，以使所述第二辊压面在所述第二压辊滚动挤压所述锂带时补偿所述第二压辊的膨胀量。
上述技术方案中，第二压辊具有向靠近第二压辊的轴线凹陷的第二辊压面，第二辊压面在第二压辊滚动挤压锂带时补偿第二压辊的膨胀量，在第一压辊和第二压辊的总的膨胀量恒定的情况下，第一压辊的第一辊压面和第二压辊的第二辊压面共同补偿第一压辊和第二压辊的膨胀量，能够在保证总的膨胀量的情况下，使得第一压辊和第二压辊具有较好的结构强度。
在本申请第一方面的一些实施例中，所述第一辊压面凹陷的最大深度H 1、所述第二辊压面凹陷的最大深度H 2、所述锂带的宽度L、所述第一压辊的最大直径D 1、第二压辊的最大直径D 2，满足如下关系式：
H 1+H 2＝5L/((D 1+D 2)/2) 2。
上述技术方案中，第一辊压面凹陷的最大深度H 1、第二辊压面凹陷的最大深度H 2、锂带的宽度L、第一压辊的最大直径D 1、第二压辊的最大直径D 2满足H 1+H 2＝5L/((D 1+D 2)/2) 2，使得第一辊压面和第二辊压面能够补偿的总的膨胀量与第一压辊和第二压辊的总的膨胀量匹配，从而有效改善锂带辊压过程宽度方向的轧制不充分和不均一的问题。
在本申请第一方面的一些实施例中，所述第一辊压面凹陷的最大深度与所述第二辊压面凹陷的最大深度相同。
上述技术方案中，第一辊压面凹陷的最大深度与第二辊压面凹陷的最大深度相同，使得第一辊压面和第二辊压面在第一压辊和第二压辊滚动挤压锂带时补偿的补偿量相同，有利于提高锂带延展均匀性。
在本申请第一方面的一些实施例中，所述第一压辊和所述第二压辊中一者的最大直径小于另一者的最大直径。
上述技术方案中，第一压辊和第二压辊中一者的最大直径小于另一者的最大直径，既能实现锂带的传送，还能减小压辊装置的体积。
在本申请第一方面的一些实施例中，沿第二压辊的轴向，第二压辊的直径相等；第一压辊的最大直径小于第二压辊的最大直径。
上述技术方案中，设有第一辊压面的第一压辊的最大直径小于第二压辊的最大直径，有利于改善锂带辊压过程宽度方向的轧制不充分和不均一的问题，还有利于锂带的传送。
第二方面，本申请实施例提供一种补锂设备，包括供锂装置和第一方面实施例提供的压辊装置。所述供锂装置用于提供锂带。所述压辊装置被配置为对辊压锂带。
上述技术方案中，第一压辊设有向靠近第一压辊的轴线方向凹陷的第一辊压面，相当于在第一压辊的表面设有一个凹部，凹陷的尺寸能够补偿第一压辊和第二压辊受热膨胀的尺寸，以使即 使在第一压辊和第二压辊膨胀后，第一压辊和第二压辊之间的辊压间隙趋于一致，能够提高锂带延展的均匀性和降低因在第一压辊和第二压辊之间锂带堆积量过大而影响锂带传送的风险，从而提高对极片的补锂质量。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，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，还可以根据这些附图获得其他相关的附图。
图1为本申请一些实施例提供的补锂设备的结构示意图；
图2为本申请一些实施例提供的第一脱模剂涂布装置；
图3为本申请一些实施例提供的第二脱模剂涂布装置；
图4为本申请一些实施例提供的压辊装置的结构示意图；
图5为本申请另一实施例提供的第一压辊的结构示意图；
图6为本申请一些实施例提供的压辊装置辊压锂带的示意图；
图7为本申请再一些实施例提供的压辊装置的第一视角的示意图；
图8为本申请再一些实施例提供的压辊装置的第二视角的示意图。
图标：1000-补锂设备；100-供锂装置；200-压辊装置；210-第一压辊；211-第一辊压面；220-第二压辊；221-第二辊压面；230-辊压间隙；240-支撑辊；300-第一预压装置；310-第一预压辊；320-第二预压辊；330-预压间隙；400-第一脱模剂涂布装置；410-背辊；420转移辊；430-料槽；440-刮刀；500-第二脱模剂涂布装置；510-纠偏器；520-第一边缘涂布辊；530-第二边缘涂布辊；540第一边缘料槽；550-第二边缘料槽；600-脱模剂漏涂检测装置；700-第三脱模剂涂布装置；800-牵引装置；810-牵引载体膜；900-极片放卷装置；1100-极片收卷装置；1200-清洁装置；2000-锂带；3000-极片；A-锂带的厚度方向；B-锂带的宽度方向。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请实施例的描述中，需要说明的是，指示方位或位置关系为基于附图所示的方位或位置关系，或者是该申请产品使用时惯常摆放的方位或位置关系，或者是本领域技术人员惯常理解的方位或位置关系，或者是该申请产品使用时惯常摆放的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
锂电池因其能量密度高，循环寿命长和适用温度范围广的优点而被广泛的应用于航空航天，计算机，移动通讯设备，机器人和电动汽车等领域。但是锂电池在首次充放电过程中会形成固体电解质膜(SEI膜)固体电解质膜会消耗部分锂，造成锂的损失，且此锂的损失直接导致锂离子电池容量的损失。
为了减小固体电解质膜消耗锂后带来的电池容量损失，普遍采用锂离子电池极片的补锂工艺，以补充被消耗的锂，以提高锂电池容量，补锂工艺是将一定厚度的锂带通过压辊装置辊压之后形成厚度较小的锂带，并将辊压后的锂带附接在极片的活性物质层的表面的一种工艺方法。
发明人发现，在压辊装置辊压锂带的过程中，沿锂带的宽度方向，锂带中部区域相对宽度方向的两侧区域容易形成堆积，容易造成卡带从而影响锂带的传送，且锂带中部区域相对宽度方向两侧的区域的散热能力差，使得锂带中部区域对应的压辊位置容易受热膨胀，使得压辊之间的间隙变小，导致锂带的中部区域的延展厚度相对宽度方向的两侧的厚度更小，从而使锂带延展不均匀。
基于此，为了解决目前压辊装置存在的延展不均匀和容易卡开的问题，本申请实施例提供一种压辊装置，包括配合辊压锂带的第一压辊和第二压辊，通过在第一压辊设置向靠近第一压辊的轴线方向凹陷的第一辊压面，以使第一辊压面在第一压辊滚动挤压锂带时补偿第一压辊的膨胀量，相当于在第一压辊的表面设有一个凹部，凹陷的尺寸能够补偿第一压辊和第二压辊受热膨胀的尺寸，以使即使在第一压辊和第二压辊膨胀后，第一压辊和第二压辊之间的辊压间隙趋于一致，能够提高锂带延展的均匀性和降低因在第一压辊和第二压辊220之间锂带堆积量过大而影响锂带传送的风险。
本申请实施例提供的压辊装置不但可以用于电池制造技术领域，还可以用于其他需要压辊装置参与辊压作业的领域。
本申请实施例以压辊装置用于电池制造技术领域中的补锂工艺为例对压辊装置进行介绍。
如图1所示，本申请实施例提供一种补锂设备1000，包括供锂装置100和压辊装置200。供锂装置100用于提供锂带2000。压辊装置200被配置为对辊压锂带2000。
在一些实施例中，补锂设备1000还包括第一预压装置300，第一预压装置300设置于供锂装置100的下游，且第一预压装置300设置于压辊装置200的上游，第一预压装置300包括第一预压辊310、第二预压辊320和第一机架(图中未示出)，第一预压辊310和第二预压辊320均可转动地设置于第一机架，第一预压辊310的外圆周面和第二预压辊320的外圆周面之间形成预压间隙330，预压间隙330用于供锂带2000穿过，第一预压辊310和第二预压辊320配合以在压辊装置200对锂带2000进行辊压之前对锂带2000表面展平。第一预压辊310的轴线方向和第二预压辊320的轴线方向一致，第一预压辊310的轴线方向、第二预压辊320的轴线方向和锂带的宽度方向B一致。
需要说明的是，本申请实施例中上文、下文中所提及的“上游”以及“下游”指的是生产顺序的先后，上游是指生产顺序在先，下游是指生产顺序在后，并非限定各部件之间的空间位置。
在一些实施例中，补锂设备1000还包括第一脱模剂涂布装置400，第一脱模剂涂布装置400位于第一预压装置300的下游，且第一脱模剂涂布装置400位于压辊装置200的上游，第一脱模剂涂布装置400用于对锂带的厚度方向A的两个表面涂覆脱模剂。
在一些实施例中，补锂设备1000还包括第二脱模剂涂布装置500，第二脱模剂涂布装置500位于第一预压装置300的下游，且第二脱模剂涂布装置500位于压辊装置200的上游，第二脱模剂涂布装置500用于对锂带的宽度方向B的两个表面涂覆脱模剂。
在一些实施例中，补锂设备1000还包括脱模剂漏涂检测装置600和第三脱模剂涂布装置700，脱模剂漏涂检测装置600和第三脱模剂涂布装置700均位于第二脱模剂涂布装置500的下游，脱模剂漏涂检测装置600用于检测锂带2000是否有漏涂脱模剂的位置，第三脱模剂涂布装置700用于根据脱模剂漏涂检测装置600检测信号对锂带2000漏涂脱模剂的位置涂覆脱模剂。
本申请实施例中，图示中的空心箭头为对应辊可以的转动方向。
如图2所示，在一些实施例中，第一脱模剂涂布装置400包括背辊410、转移辊、料槽430和刮刀440。背辊410和转移辊分别位于锂带的厚度方向A的两侧，背辊410的轴线方向和转移辊的轴线方向一致，背辊410的轴线方向和转移辊的轴线方向均与锂带的宽度方向B一致，锂带2000经过背辊410和转移辊之间，料槽430中加入脱模剂，通过刮刀440控制转移辊上脱模剂厚度，锂带2000接触转移辊，将转移辊表面的脱模剂黏附在锂带2000表面，实现锂带2000表面脱模剂涂布；锂带2000表面脱模剂漏涂检测装置600通过CCD(Charge-coupled Device，电荷耦合元件或者图像控制器)等方式，监控锂带2000表面漏涂面积，漏涂面积超规格，自动反馈到第三脱模剂涂布装置700，将漏涂区域补充脱模剂，实现锂带2000表面脱模剂在线漏涂补充功能。
如图3所示，在一些实施例中，第二脱模剂涂布装置500包括纠偏器510、第一边缘涂布辊520、第二边缘涂布辊530、第一边缘料槽430和第二边缘料槽550。第一边缘涂布辊520和第二边缘涂布辊530分别位于锂带2000宽度方向的两侧，第一边缘涂布辊520的轴线方向和第二边缘涂布辊530的轴线方向一致，第一边缘涂布辊520的轴线方向和第二边缘涂布辊530的轴线方向均垂直锂带的宽度方向B，锂带2000经过第一边缘涂布辊520和第二边缘涂布辊530之间。锂带2000经过第一边缘涂布辊520，锂带2000经过第二边缘涂布辊530，第一边缘料槽430和第二边缘料槽550加入脱模剂，第一边缘涂布辊520和第二边缘涂布辊530可以设计为凹槽辊，凹槽辊轮经过第一边缘料槽430和第二边缘料槽550，可将第一边缘料槽430和第二边缘料槽550中脱模剂带出，锂带2000经过第一边缘涂布辊520和第二边缘涂布辊530，将第一边缘涂布辊520的凹槽和第二边缘涂布辊530的凹槽内的脱模剂涂布在锂带的宽度方向B两侧的表面，实现锂带2000边缘涂布。
为了便于锂带2000的传送，在一些实施例中，补锂设备1000还包括牵引装置800，牵引装置800用于收卷或者释放牵引载体膜810，牵引载体膜810的一端与锂带2000的一端连接，牵引装置800收卷牵引载体膜810时，供锂装置100释放锂带2000。
补锂设备1000用于对极片3000补锂，因此，补锂设备1000还包括极片放卷装置900和极片收卷装置1100，极片放卷装置900用于释放极片3000，极片收卷装置1100用于收卷极片放卷装置900释放的极片3000。
极片放卷装置900将极片3000放卷经过压辊装置200，经压辊装置200辊压后的超薄锂带2000能够在压辊装置200的压辊转动的作用下转移至极片3000的厚度方向的表面，最终实现极片3000两面同时黏附超薄锂带2000的功能以实现极片3000补锂。
补锂设备1000还包括清洁装置1200和吸尘装置(图中未示出)，清洁装置1200用于清洁压辊装置200的压辊的表面未完全转移至极片3000的表面的残留锂屑及残留脱模剂。清洁装置1200可以包括刮片，刮片用于刮落压辊装置200的压辊的表面未完全转移至极片3000的表面的残留锂屑及残留脱模剂。
清洁装置1200两侧设置有吸尘装置，用于将清洁装置1200的清理的残留锂膜吸收收集。
如图4所示，在一些实施例中，压辊装置200包括第一压辊210和第二压辊220。第二压辊220用于与第一压辊210配合辊压锂带2000。其中，第一压辊210包括用于辊压锂带2000的第一辊压面211，第一辊压面211向靠近第一压辊210的轴线的方向凹陷，以使第一辊压面211在第一压辊210滚动挤压锂带2000时补偿第一压辊210的膨胀量。
压辊装置200还包括第二机架(图中未示出)，第一压辊210和第二压辊220均可转动地设置于第二机架，第一压辊210和第二压辊220分别位于锂带的厚度方向A的两侧，并形成辊压间隙230，锂带2000经过辊压间隙230的过程中被第一压辊210和第二压辊220配合辊压。第一压辊210的轴线方向和第二压辊220的轴线方向一致，第一压辊210的轴线方向、第二压辊220的轴线方向和锂带的宽度方向B(图3中示出)一致，极片3000的厚度方向与极片3000的宽度方向垂直。第一压辊210和第二压辊220的转动方向相反。
压辊装置200辊压锂带2000可以采用热辊轧制，也可以采用冷辊轧制。关于热辊轧制：第一压辊210和第二压辊220的温度可以保持在30℃-40℃之间，主要是为了将锂带2000软化，有利于锂带的宽度方向B轧制均匀，还有利于减少轧制过程中锂带2000硬颗粒轧制未软化而导致的 局部锂轧制不开而形成的拉丝等轧制不良缺陷。但是第一压辊210和第二压辊220的温度不能过高，温度过高(比如第一压辊210和第二压辊220的温度超过45°)，锂带2000的燃点为180℃，热辊的温度过高可能导致轧制出的超薄锂带2000自燃；第一压辊210和第二压辊220的温度≥50℃，对热辊高温下反弹控制难度大。关于冷辊轧制：冷辊轧制方式(比如第一压辊210和第二压辊220的温度≤20℃)，可降低热辊轧制过程辊受热反弹不一致性风险；同时，冷辊轧制，对设备受热反弹要求降低，可显著压辊制造难度，降低压辊制造成本，此外，冷辊轧制可以迅速将高速轧制出的锂带2000降温，从而降低锂带2000受热易反应甚至起火自燃等风险。
在对辊压锂带2000的过程中，沿锂带的宽度方向B，锂带2000中部相对两侧容易形成堆积，且锂带2000中部区域相对宽度方向两侧的区域的散热能力差，使得锂带2000的中部区域对应的压辊位置容易受热膨胀，使得锂带2000中部区域对应的第一压辊210和第二压辊220之间的间隙变小，导致锂带2000中部区域延展厚度相对宽度方向的两侧的区域的厚度更小，从而使锂带2000延展不均匀，当堆积量过大还会出现卡带从而影响锂带2000的传送，因此第一压辊210设有向靠近第一压辊210的轴线方向凹陷的第一辊压面211，相当于在第一压辊210的表面设有一个凹部，凹陷的尺寸能够补偿第一压辊210和第二压辊220受热膨胀的尺寸，以使即使在第一压辊210和第二压辊220膨胀后，第一压辊210和第二压辊220之间的辊压间隙230趋于一致，能够提高锂带2000延展的均匀性和降低因在第一压辊210和第二压辊220之间锂带2000堆积量过大而影响锂带2000传送的风险。换句话说，锂带2000中间区域易堆积即因为锂带2000中间区域入料速度过小，通过设置第一辊压面211，可使锂带2000中间区域对应的压辊间隙增加，增加单位时间锂带2000入料量，从而解决锂带2000高速轧制堆积问题。第一辊压面211的设置可显著降低锂带2000堆积的风险，从而降低锂带2000张力(常规辊需要大张力以尽可能使锂带2000中间区域受力，从而减缓锂带2000轧制堆积)，但锂带2000大张力会直接导致锂带的宽度方向B的边缘区域拉伸变形严重，导致锂带2000轧制出来的锂膜宽度一致性差，影响轧制后的锂带2000与极片3000之间覆合控制，进而影响电性能，第一辊压面211的设置补偿第一压辊210在辊压锂带2000时的膨胀量，从而提高锂带2000延展的均匀性，以提高补锂质量，从而降低由于锂离子电池在首次充放电过程中的锂损失导致电池容量的降低的可能性。
实际辊压过程中，锂带的宽度方向B与第一压辊210的轴线方向和第二压辊220的轴线方向一致，沿锂带的宽度方向B，越靠近锂带2000的中间堆积量越大，散热能力越差，第一压辊210和第二压辊220受热膨胀量越大，因此，在一些实施例中，第一辊压面211的直径从在第一压辊210的轴线方向两端至中间逐渐减小。
实现第一辊压面211的直径从在第一压辊210的轴线方向两端至中间逐渐减小的方式有很多，比如，在一些实施例中，第一辊压面211包括两个圆锥面，两个圆锥面的小端相连。
再比如，在一些实施例中，第一压辊210具有经过第一压辊210的轴线的第一横截面，第一横截面与第一辊压面211相交形成两条第一相交线，第一相交线为圆弧线；第一辊压面211为第一相交线绕第一压辊210的轴线回转形成的回转面。
沿第一压辊210的轴线方向，第一相交线的中点位于第一压辊210的中垂面上，其中，第一压辊210的中垂面垂直第一压辊210的轴线，第一压辊210包括关于第一压辊210的中垂面对称设置的第一轴段和第二轴段，由第一相交线绕第一压辊210的轴线回转形成的第一辊压面211包括关于第一压辊210的中垂面对称设置的第一部分和第二部分。
第一辊压面211为圆弧形的第一相交线绕第一压辊210的轴线回转形成的回转面，使得第一压辊210绕自身轴线转动任何角度，第一辊压面211滚动挤压锂带2000时补偿第一压辊210的膨胀量是恒定的，进一步提高锂带2000延展均匀性和降低因在第一压辊210和第二压辊220之间锂带2000堆积量过大而影响锂带2000传送的风险。
第一辊压面211的直径从在第一压辊210的轴线方向两端至中间逐渐减小，能够补偿的量与第一压辊210的膨胀量相对应，进一步提高锂带2000延展均匀性和降低因在第一压辊210和第二压辊220之间锂带2000堆积量过大而影响锂带2000传送的风险。
在一些实施例中，第一辊压面211延伸至第一压辊210的轴向的两端。
“第一辊压面211延伸至第一压辊210的轴向的两端”是指，沿第一压辊210的轴线方向，第一辊压面211的两端与第一压辊210的两端平齐，也可以理解为，第一压辊210的外周面为第一辊压面211。另一些实施例中，如图5所示，沿第一压辊210的轴线方向，第一压辊210的两端可以超出第一辊压面211的两端，第一辊压面211为第一压辊210的外周面的部分。
第一辊压面211延伸至第一压辊210的轴向的两端，若是锂带2000的宽度尺寸不超过第一压辊210的轴向尺寸，则沿锂带的宽度方向B，第一辊压能够完全覆盖锂带2000，使得第一辊压面211始终能够在第一压辊210滚动挤压锂带2000时补偿第一压辊210的膨胀量。
在一些实施例中，第一辊压面211的表面粗糙度大于等于0.3μm。
使第一辊压面211的表面粗糙度达到一定程度是为了保证第一辊压面211与锂带2000接触时不会打滑。在其他实施例中，还可以通过增加锂带2000表面脱模剂摩擦力，比如使锂带2000表面脱模剂摩擦力≥50N/m，以增大第一辊压面211和锂带2000接触时的摩擦力。
第一辊压面211的表面粗糙度大于等于0.3μm，使得第一辊压面211与锂带2000接触时，第一辊压面211与锂带2000之间具有较大的摩擦力，大摩擦力可以使锂带2000被动带入第一压辊210和第二压辊220之间间隙，有利于锂带2000的传送，且还能在微观层面锂带2000每个区域被轧制更久更充分，从而可改善锂带2000辊压过程宽度方向的轧制不充分和不均一问题。
如图6所示，在一些实施例中，第二压辊220的周面具有第二辊压面221，第二辊压面221向靠近第二压辊220的轴线的方向凹陷，以使第二辊压面221在第二压辊220滚动挤压锂带2000时补偿第二压辊220的膨胀量。
第一压辊210的轴向尺寸和第二压辊220的轴向尺寸可以相等，也可以不相等。第一辊压面211的轴向尺寸和第二辊压面221的轴向尺寸可以相等，也可以不相等。
第二压辊220具有向靠近第二压辊220的轴线凹陷的第二辊压面221，第二辊压面221在第二压辊220滚动挤压锂带2000时补偿第二压辊220的膨胀量，在第一压辊210和第二压辊220的总的膨胀量恒定的情况下，第一压辊210的第一辊压面211和第二压辊220的第二辊压面221共同补偿第一压辊210和第二压辊220的膨胀量，能够在保证总的膨胀量的情况下，使得第一压辊210和第二压辊220具有较好的结构强度。
第二辊压面221的结构可以参照第一辊压面211。
实际辊压过程中，锂带的宽度方向B与第一压辊210的轴线方向和第二压辊220的轴线方向一致，沿锂带的宽度方向B，越靠近锂带2000的中间堆积量越大，散热能力越差，第一压辊210和第二压辊220受热膨胀量越大，因此，在一些实施例中，第二辊压面221的直径从在第二压辊220的轴线方向两端至中间逐渐减小。
实现第二辊压面221的直径从在第二压辊220的轴线方向两端至中间逐渐减小的方式有很多，比如，在一些实施例中，第二辊压面221包括两个圆锥面，两个圆锥面的小端相连。
再比如，在一些实施例中，第二压辊220具有经过第二压辊220的轴线的第二横截面，第二横截面与第二辊压面221相交形成两条第二相交线，第二相交线为圆弧线；第二压面为第二相交线绕第二压辊220的轴线回转形成的回转面。
沿第二压辊220的轴线方向，第二相交线的中点位于第二压辊220的中垂面上，其中，第二压辊220的中垂面垂直第二压辊220的轴线，第二压辊220包括关于第二压辊220的中垂面对称设置的第三轴段和第四轴段，由第二相交线绕第二压辊220的轴线回转形成的第二辊压面221包括关于第二压辊220的中垂面对称设置的第三部分和第四部分。
第二相交线的中点和第一相交线的中点位于同一平面。
第二辊压面221为圆弧形的第二相交线绕第二压辊220的轴线回转形成的回转面，使得第二压辊220绕自身轴线转动任何角度，第二辊压面221滚动挤压锂带2000时补偿第二压辊220的膨胀量是恒定的，进一步提高锂带2000延展均匀性和降低因在第一压辊210和第二压辊220之间锂带2000堆积量过大而影响锂带2000传送的风险。
第二辊压面221的直径从在第二压辊220的轴线方向两端至中间逐渐减小，能够补偿的量与第二压辊220的膨胀量相对应，进一步提高锂带2000延展均匀性和降低因在第一压辊210和第二压辊220之间锂带2000堆积量过大而影响锂带2000传送的风险。
在一些实施例中，第二辊压面221延伸至第二压辊220的轴向的两端。
“第二辊压面221延伸至第二压辊220的轴向的两端”是指，沿第二压辊220的轴线方向，第二辊压面221的两端与第二压辊220的两端平齐，也可以理解为，第二压辊220的外周面为第二辊压面221。另一些实施例中，沿第二压辊220的轴线方向，第二压辊220的两端可以超出第二辊压面221的两端，第二辊压面221为第二压辊220的外周面的部分。
第二辊压面221延伸至第二压辊220的轴向的两端，若是锂带2000的宽度尺寸不超过第二压辊220的轴向尺寸，则沿锂带的宽度方向B，第二辊压能够完全覆盖锂带2000，使得第一辊压面211始终能够在第一压辊210滚动挤压锂带2000时补偿第一压辊210的膨胀量。
在一些实施例中，第二辊压面221的表面粗糙度大于等于0.3μm。
使第二辊压面221的表面粗糙度达到一定程度是为了保证第二辊压面221与锂带2000接触时不会打滑。在其他实施例中，还可以通过增加锂带2000表面脱模剂摩擦力，比如使锂带2000表面脱模剂摩擦力≥50N/m，以增大第二辊压面221和锂带2000接触时的摩擦力。
第二辊压面221的表面粗糙度大于等于0.3μm，使得第二辊压面221与锂带2000接触时，第二辊压面221与锂带2000之间具有较大的摩擦力，大摩擦力可以使锂带2000被动带入第一压辊210和第二压辊220之间间隙，有利于锂带2000的传送，且还能在微观层面锂带2000每个区域被轧制更久更充分，从而可改善锂带2000辊压过程宽度方向的轧制不充分和不均一问题。
在一些实施例中，第一辊压面211凹陷的最大深度H 1、第二辊压面221凹陷的最大深度H 2、锂带2000的宽度L、第一压辊210的最大直径D 1、第二压辊220的最大直径D 2，满足如下关系式：H 1+H 2＝5L/((D 1+D 2)/2) 2。
第一辊压面211凹陷的最大深度H 1、第二辊压面221凹陷的最大深度H 2可以是H 1＞H 2，也可以是H 1＜ H2，也可以是H 1＝H 2。在一些实施例中，可以是H 2＝0，当H 2＝0，H1为实际辊压锂带2000过程中第一压辊210的最大膨胀量和第二压辊220的最大膨胀量之和。
第一辊压面211凹陷的最大深度H 1是指从第一压辊210的直径最大的位置与第一辊压面211最靠近第一压辊210的轴线的位置在第一压辊210的径向的距离。第二辊压面221凹陷的最大深度H 2是指从第二压辊220的直径最大的位置与第二辊压面221最靠近第二压辊220的轴线的位置在第二压辊220的径向的距离。
第一辊压面211凹陷的最大深度H 1、第二辊压面221凹陷的最大深度H 2、锂带2000的宽度L、第一压辊210的最大直径D 1、第二压辊220的最大直径D2满足H 1+H 2＝5L/((D 1+D 2)/2) 2，使得第一辊压面211和第二辊压面221能够补偿的总的膨胀量与第一压辊210和第二压辊220的总的膨胀量匹配，从而有效改善锂带2000辊压过程宽度方向的轧制不充分和不均一的问题。
在一些实施例中，第一辊压面211凹陷的最大深度与第二辊压面221凹陷的最大深度相同。
第一辊压面211凹陷的最大深度位置与第二辊压面221凹陷的最大深度位置对齐，换句话说，第一辊压面211凹陷的最大深度位置与第二辊压面221凹陷的最大深度位置沿第一压辊210的轴向的距离为0。
第一辊压面211凹陷的最大深度与第二辊压面221凹陷的最大深度相同，使得第一辊压面211和第二辊压面221在第一压辊210和第二压辊220滚动挤压锂带2000时补偿的补偿量相同，有利于提高锂带2000延展均匀性。
在一些实施例中，第一压辊210和第二压辊220中一者的最大直径小于另一者的最大直径。
在其他实施例中，第一压辊210的最大直径和第二压辊220的最大直径可以相等。
第一压辊210和第二压辊220中一者的最大直径小于另一者的最大直径，既能实现锂带2000的传送，还能减小压辊装置200的体积。
在一些实施例中，沿第二压辊220的轴向，第二压辊220的直径相等；第一压辊210的最大直径小于第二压辊220的最大直径。
设有第一辊压面211的第一压辊210的最大直径小于第二压辊220的最大直径，有利于改善锂带2000辊压过程宽度方向的轧制不充分和不均一的问题，还有利于锂带2000的传送。
如图7、图8所示，在一些实施例中，压辊装置200还包括支撑辊240，支撑辊240固定安装于第二支架。第一支撑辊240设置于第一压辊210背离第二压辊220的一侧，以为第一压辊210提供径向支撑力。在另一些实施例中，第一支撑辊240可以设置于第二压辊220背离第一压辊210的一侧，以为第二压辊220提供径向支撑力。
如图8所示，本申请一些实施例提供一种压辊装置200，压辊装置200包括第一压辊210和第二压辊220，第一压辊210的表面具有第一辊压面211，第一辊压面211为圆弧形的第一相交线绕第一压辊210的轴线回转的回转面，第一辊压面211延伸至第一压辊210轴向的两端，第二压辊220的表面具有第二辊压面221，第二辊压面221为圆弧形的第二相交线绕第二压辊220的轴线回转的回转面，第二辊压面221延伸至第二压辊220轴向的两端。
本申请实施例还提供一种补锂设备1000，补锂设备1000包括供锂装置100和上述任意实施例提供的压辊装置200。供锂装置100用于提供锂带2000。压辊装置200被配置为对辊压锂带2000。
第一压辊210设有向靠近第一压辊210的轴线方向凹陷的第一辊压面211，相当于在第一压辊210的表面设有一个凹部，凹陷的尺寸能够补偿第一压辊210和第二压辊220受热膨胀的尺寸，以使即使在第一压辊210和第二压辊220膨胀后，第一压辊210和第二压辊220之间的辊压间隙230趋于一致，能够提高锂带2000延展的均匀性和降低因在第一压辊210和第二压辊220之间锂带2000堆积量过大而影响锂带2000传送的风险，从而提高对极片3000的补锂质量。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (11)

  1. 一种压辊装置，包括：
    第一压辊；以及
    第二压辊，用于与所述第一压辊配合辊压锂带；
    其中，所述第一压辊包括用于辊压所述锂带的第一辊压面，所述第一辊压面向靠近所述第一压辊的轴线的方向凹陷，以使所述第一辊压面在所述第一压辊滚动挤压所述锂带时补偿所述第一压辊的膨胀量。
  2. 根据权利要求1所述的压辊装置，其中，所述第一辊压面的直径从在所述第一压辊的轴线方向两端至中间逐渐减小。
  3. 根据权利要求2所述的压辊装置，其中，所述第一压辊具有经过所述第一压辊的轴线的第一横截面，所述第一横截面与所述第一辊压面相交形成两条第一相交线，所述第一相交线为圆弧线；
    所述第一辊压面为所述第一相交线绕所述第一压辊的轴线回转形成的回转面。
  4. 根据权利要求1-3任一项所述的压辊装置，其中，所述第一辊压面延伸至所述第一压辊的轴向的两端。
  5. 根据权利要求1-4任一项所述的压辊装置，其中，所述第一辊压面的表面粗糙度大于等于0.3μm。
  6. 根据权利要求1-5任一项所述的压辊装置，其中，所述第二压辊的周面具有第二辊压面，所述第二辊压面向靠近所述第二压辊的轴线的方向凹陷，以使所述第二辊压面在所述第二压辊滚动挤压所述锂带时补偿所述第二压辊的膨胀量。
  7. 根据权利要求6所述的压辊装置，其中，所述第一辊压面凹陷的最大深度H 1、所述第二辊压面凹陷的最大深度H 2、所述锂带的宽度L、所述第一压辊的最大直径D 1、第二压辊的最大直径D 2，满足如下关系式：
    H 1+H 2＝5L/((D 1+D 2)/2) 2。
  8. 根据权利要求6或7所述的压辊装置，其中，所述第一辊压面凹陷的最大深度与所述第二辊压面凹陷的最大深度相同。
  9. 根据权利要求1-8任一项所述的压辊装置，其中，所述第一压辊和所述第二压辊中一者的最大直径小于另一者的最大直径。
  10. 根据权利要求9所述的压辊装置，其中，沿所述第二压辊的轴向，所述第二压辊的直径相等；
    所述第一压辊的最大直径小于所述第二压辊的最大直径。
  11. 一种补锂设备，包括：
    供锂装置，用于提供锂带；以及
    根据权利要求1-10任一项所述的压辊装置，所述压辊装置被配置为对辊压锂带。
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CN112838187A (zh) * 2021-04-15 2021-05-25 江苏时代新能源科技有限公司 补锂设备及补锂方法
CN113675363A (zh) * 2021-08-20 2021-11-19 蜂巢能源科技有限公司 一种极片补锂方法及极片补锂装置
CN114030929A (zh) * 2022-01-10 2022-02-11 天津中能锂业有限公司 极片条形间隔预锂化装置
CN216720037U (zh) * 2022-01-10 2022-06-10 天津中能锂业有限公司 一种锂膜两用的极片条形间隔预锂化装置

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