WO2021004409A1 - 用于锂膜成形的机构、方法以及用于极片补锂的装置、方法 - Google Patents

用于锂膜成形的机构、方法以及用于极片补锂的装置、方法 Download PDF

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Publication number
WO2021004409A1
WO2021004409A1 PCT/CN2020/100294 CN2020100294W WO2021004409A1 WO 2021004409 A1 WO2021004409 A1 WO 2021004409A1 CN 2020100294 W CN2020100294 W CN 2020100294W WO 2021004409 A1 WO2021004409 A1 WO 2021004409A1
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WO
WIPO (PCT)
Prior art keywords
lithium
film
isolation film
pole piece
isolation
Prior art date
Application number
PCT/CN2020/100294
Other languages
English (en)
French (fr)
Inventor
谢斌
陈仕通
龚志杰
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP20836686.4A priority Critical patent/EP3933974B1/en
Publication of WO2021004409A1 publication Critical patent/WO2021004409A1/zh
Priority to US17/568,344 priority patent/US20220199964A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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 embodiments of the present application relate to the field of electrochemistry, in particular to mechanisms and methods for forming lithium films, and devices and methods for replenishing lithium on pole pieces.
  • lithium can be supplemented by pole pieces to improve battery cycle performance and increase energy density.
  • two isolation films sandwich the lithium ribbon into two rolls for rolling to roll the lithium ribbon into a lithium foil and make the lithium foil adhere to one of the isolation films, and then carry lithium
  • the isolation film of the foil is rolled with the pole piece, so that the lithium foil is separated from the isolation film and adhered to the pole piece, thereby forming a lithium supplement pole piece.
  • the rolling force is large, and the lithium strip is rolled into lithium foil.
  • the damage to the two isolation membranes will also be large, and the isolation membrane consumption is huge.
  • the purpose of this application is to provide a mechanism and method for forming lithium membranes, and a device and method for replenishing lithium on pole pieces, which can realize the reuse of the isolation membrane and reduce The cost of replenishing lithium.
  • the present application provides a mechanism for forming a lithium film
  • the mechanism for forming a lithium film includes a first isolation film providing Mechanism, a second isolation film providing mechanism, a lubricating substance application mechanism, a lithium belt providing mechanism, and two rollers
  • the first isolation film providing mechanism is located upstream of the two rollers, and the first isolation film providing mechanism is used To provide a first isolation film between the two rolls
  • the second isolation film providing mechanism is located upstream of the two rolls, and the second isolation film providing mechanism is used to provide a gap between the two rolls Provide a second isolation film
  • the lithium belt supply mechanism is located upstream of the two rolls, and the lithium belt supply mechanism can position the lithium belt between the first isolation film and the second isolation film, and is used for Lithium belt is provided between the two rolls
  • the lubricating substance applying mechanism is located upstream of the two rolls, and the lubricating substance applying mechanism is used to apply the lubricating
  • the isolating film and/or the second isolating film apply a lubricating substance to the surface of the lithium belt, and the two rollers are used to roll the first isolating film, the lithium belt and the second isolating film To form a lithium film by rolling the lithium ribbon into a lithium foil and adhering the lithium foil on the second isolation film.
  • the lubricating substance applying mechanism is a coating mechanism.
  • the mechanism for forming the lithium film further includes a first isolation film collection mechanism; the first isolation film collection mechanism is located downstream of the two rollers, and the first isolation film collection mechanism is used for To collect the first isolation film passing between the two rolls.
  • the mechanism for forming the lithium film further includes a first release agent providing mechanism; the first release agent providing mechanism is located between the two rolls and the first isolation film collecting mechanism Meanwhile, the first release agent providing mechanism is used to provide a release agent to the surface of the first isolation film facing the lithium belt.
  • the first release agent providing mechanism is a coating mechanism.
  • the lubricating substance is applied to the surface of the second isolation film facing the lithium belt before entering the two rolls in an intermittent manner.
  • the present application provides a device for replenishing lithium on a pole piece.
  • the pole piece includes a current collector and an active material layer disposed on the surface of the current collector.
  • the device for replenishing lithium includes a rolling mechanism and a pole piece providing mechanism; the rolling mechanism includes two pressing rollers; the pole piece providing mechanism is located upstream of the two pressing rollers, and the pole piece providing mechanism is used to A pole piece is provided between the two pressing rollers; the device for replenishing lithium on the pole piece further includes the mechanism for forming a lithium film according to the first aspect of the present application, and the mechanism for forming a lithium film Located upstream of the two pressing rollers, the roller pressing mechanism is used for calendering the lithium film and the pole piece so that the lithium foil in the lithium film adheres to the active material layer.
  • the device for replenishing lithium for pole pieces further includes a second isolation film collection mechanism; the second isolation film collection mechanism is located downstream of the two pressure rollers, and the second isolation film collection The mechanism is used to allow the lithium film to pass between the two pressing rollers and to collect the second isolation film in the lithium film passing between the two pressing rollers.
  • the device for replenishing lithium pole piece further includes a lithium replenishing pole piece collecting mechanism; the lithium replenishing pole piece collecting mechanism is located downstream of the two pressure rollers, and the lithium replenishing pole piece collecting mechanism The mechanism is used to collect the pole piece with the lithium foil adhered to the active material layer.
  • the mechanism for forming the lithium film and the second isolation film collecting mechanism are two groups, so as to provide the lithium foil on both surfaces of the pole piece.
  • the device for replenishing lithium on pole pieces further includes a device for replenishing the surface of the second isolation film, which is arranged between the two pressing rollers and the second isolation film collecting mechanism.
  • the surface of the lithium pole piece is provided with a second release agent providing mechanism of a release agent, and the lithium supplement pole piece is formed by adhering the lithium foil to the active material layer.
  • the beneficial effect of the embodiment of the present application is that the lubricating substance applying mechanism is used to apply the lubricating substance to the surface of the first isolation film and/or the second isolation film facing the lithium belt before entering the two rolls, between the two rolls
  • the rolling force can be significantly reduced, which can reduce the damage of the roller to the first isolation film and the second isolation film when the lithium strip is rolled into a lithium foil, realize the reuse of the first isolation film and the second isolation film, and reduce the replenishment of lithium cost.
  • the present application provides a method for forming a lithium film, including: providing a first isolation film, a second isolation film, and a lithium ribbon; Lubricating substance is applied to the surface of the second isolation film; the lithium belt is positioned between the first isolation film and the second isolation film, wherein the first isolation film and/or the second isolation film The surface of the isolation film on which the lubricating substance is applied faces the lithium ribbon; the first isolation film, the lithium ribbon, and the second isolation film are rolled to roll the lithium ribbon into a lithium foil and make the The lithium foil is adhered to the second isolation film to form a lithium film.
  • the method for replenishing lithium for pole pieces further includes recovering the first isolation film.
  • the method for forming the lithium film before rolling the first isolation film, the lithium ribbon, and the second isolation film, the method for forming the lithium film further includes facing the first isolation film The surface of the lithium belt provides a release agent.
  • the application of the lubricating substance to the surface entering the second isolation membrane is performed in an intermittent manner.
  • the present application provides a method for replenishing lithium in a pole piece, the pole piece comprising a current collector and an active material layer disposed on the surface of the current collector, the The method for replenishing lithium in the pole piece includes: providing the pole piece with the lithium film prepared by the method for forming a lithium film as described above; and calendering the lithium film and the pole piece so that the lithium film in the lithium film Lithium foil adheres to the active material layer.
  • the method for replenishing lithium for the pole piece further includes recovering the second isolation film.
  • the method for replenishing lithium on the pole piece further includes collecting the pole piece with the lithium foil adhered to the active material layer.
  • the active material layer is provided on both surfaces of the current collector, and the providing the lithium film to the pole piece includes providing the lithium film to both surfaces of the pole piece.
  • the method for replenishing lithium of a pole piece before the second isolation film is collected, the method for replenishing lithium of a pole piece further includes: providing a release agent to the surface of the second isolation film facing the lithium replenishing pole piece, and The lithium supplement pole piece is formed by adhering the lithium foil to the active material layer.
  • the beneficial effect of the embodiments of the present application is that by applying a lubricating substance to the surface of the first isolation film and/or the second isolation film, when the first isolation film, the lithium belt and the second isolation film are rolled, the first The surface of the isolation film and/or the second isolation film on which the lubricating substance is applied faces the lithium ribbon, and the rolling force required to roll the first isolation film, the lithium ribbon and the second isolation film can be significantly reduced, so that The damage to the first isolation film and the second isolation film when the lithium strip is rolled into a lithium foil is reduced, the reuse of the first isolation film and the second isolation film is realized, and the cost of lithium supplementation is reduced.
  • Fig. 1 is a schematic diagram of a first embodiment of a device for replenishing lithium on pole pieces according to the present application.
  • Fig. 2 is a schematic diagram of a second embodiment of a device for replenishing lithium on pole pieces according to the present application.
  • Fig. 3 is a schematic diagram of a third embodiment of a device for replenishing lithium on pole pieces according to the present application.
  • Fig. 4 is a schematic diagram of a first embodiment of a coating mechanism of a device for replenishing lithium on pole pieces according to the present application.
  • Fig. 5 is a schematic diagram of a second embodiment of the coating mechanism of the device for replenishing lithium on pole pieces according to the present application.
  • FIG. 6 is a schematic diagram of a third embodiment of the coating mechanism of the device for replenishing lithium on pole pieces according to the present application.
  • Fig. 1 is a schematic diagram of a first embodiment of a device for replenishing lithium on pole pieces according to the present application.
  • the device for replenishing lithium on pole pieces includes a rolling mechanism 1, a pole piece providing mechanism 2, and a mechanism 3 for forming a lithium film.
  • the device for replenishing lithium on the pole piece may further include a second isolation film collecting mechanism 4.
  • the device for replenishing lithium on the pole piece further includes a lithium replenishing pole piece collecting mechanism 5.
  • the pole piece P0 includes a current collector P01 and an active material layer P02 arranged on the surface of the current collector P01.
  • the roller pressing mechanism 1 includes two pressing rollers 11.
  • the pole piece providing mechanism 2 is located upstream of the two pressing rollers 11.
  • the pole piece providing mechanism 2 is used to provide pole pieces P0 between the two pressing rollers 11.
  • the pole piece providing mechanism 2 can be a roller, so that the pole piece providing mechanism 2 is used to supply pole pieces in roll form. P0 unwinds.
  • the active material layer P02 is continuously distributed on the surface of the current collector P01.
  • the mechanism 3 for forming the lithium film is located upstream of the two pressing rollers 11.
  • the mechanism 3 for forming the lithium film includes a first isolation film providing mechanism 31A, a second isolation film providing mechanism 31B, a lubricating substance applying mechanism 32, a lithium ribbon providing mechanism 33, and two rolls 34.
  • the mechanism 3 for forming the lithium film may further include a first isolation film collecting mechanism 35.
  • the mechanism 3 for forming the lithium film may further include a first release agent providing mechanism 36A.
  • the first isolation film providing mechanism 31A is located upstream of the two rolls 34.
  • the first isolation film providing mechanism 31A is used to provide the first isolation film S1 between the two rolls 34.
  • the first isolation film providing mechanism 31A is a roller, so the first isolation film providing mechanism 31A is used to unwind the first isolation film S1 in the form of a roll.
  • the second isolation film providing mechanism 31B is located upstream of the two rolls 34.
  • the second isolation film providing mechanism 31B is used to provide the second isolation film S2 between the two rolls 34.
  • the second isolation film providing mechanism 31B may be a roller, so that the second isolation film providing mechanism 31B is used to unwind the second isolation film S2 in the form of a roll.
  • the surface roughness of the second isolation film S2 is greater than the surface roughness of the first isolation film S1.
  • the lubricating substance applying mechanism 32 is located upstream of the two rollers 34.
  • the lubricating substance applying mechanism 32 is used to apply a lubricating substance (not shown) to the surface of the first separation film S1 facing the lithium belt L0 before entering the two rolls 34.
  • the lubricating substance applying mechanism 32 can apply the lubricating substance to the surface of the first separation film S1 in a continuous manner.
  • the lithium belt supply mechanism 33 is located upstream of the two rolls 34.
  • the lithium ribbon supply mechanism 33 can position the lithium ribbon L0 between the first isolation film S1 and the second isolation film S2 and is used to supply the lithium ribbon L0 between the two rolls 34.
  • the lithium ribbon supply mechanism 33 is a roller, so the lithium ribbon supply mechanism 33 is used to unwind the lithium ribbon L0 in the form of a roll.
  • the two rolls 34 are used to roll the first isolation film S1, the lithium ribbon L0, and the second isolation film S2 to roll the lithium ribbon L0 into a lithium foil L1 and make the lithium foil L1 adhere to the second isolation film S2.
  • a lithium film C is formed.
  • two rolls 34 roll the first isolation film S1, the lithium ribbon L0, and the second isolation film S2 that enter between the two rolls 34 so that the lithium ribbon L0 becomes the lithium foil L1 and the lithium foil L1
  • the lithium film C is continuously adhered to the second isolation film S2.
  • the first isolation film take-up mechanism 35 is located downstream of the two rollers 34.
  • the first isolation film collecting mechanism 35 is used to collect the first isolation film S1 passing between the two rollers 34. As shown in FIG. 1, the first isolation film collection mechanism 35 is a roller, so the first isolation film collection mechanism 35 is used to wind the first isolation film S1.
  • the first release agent supply mechanism 36A is located between the two rolls 34 and the first isolation film take-up mechanism 35, and the first release agent supply mechanism 36A is used to provide a release agent on the surface of the first isolation film S1 facing the lithium belt L0 (Not shown).
  • the first release agent supply mechanism 36A applies a release agent to the surface of the first isolation film S1 before the first isolation film take-up mechanism 35 receives the first isolation film S1, so that the first isolation film S1 with the release agent applied to the surface follows It is reused by the first isolation film providing mechanism 31A, especially when the first isolation film collecting mechanism 35 is in the form of a roller, the first isolation film S1 with the release agent applied on the surface is wound up, the first isolation film S1 is rolled It can be used again by the first isolation film providing mechanism 31A, thereby reducing the cost.
  • the roller pressing mechanism 1 is used for rolling the lithium film C and the pole piece P0 so that the lithium foil L1 in the lithium film C adheres to the active material layer P02 to form the lithium supplement pole piece P1.
  • the second separation film take-up mechanism 4 is located downstream of the two pressing rollers 11.
  • the second isolation film take-up mechanism 4 is used for passing the lithium film C between the two pressing rollers 11 and collecting the second isolation film S2 in the lithium film C passing between the two pressing rollers 11.
  • the second isolation film take-up mechanism 4 is a roller, and the second isolation film take-up mechanism 4 is used to wind the second isolation film S2, and the second isolation film take-up mechanism 4 passes through one of the two pressure rollers 11
  • the second isolation film S2 in the lithium film C in between provides traction.
  • the second isolation film S2 is rolled by the two rolls 34 and rolled by the two rolls 11, which will be more damaged, but If the performance of the second isolation film S2 is still good, similarly, a second release agent supply mechanism 36B can also be provided between the two pressing rollers 11 and the second isolation film take-up mechanism 4, and the second release agent supply mechanism 36B is used to provide a release agent to the surface of the second isolation film S2 facing the lithium supplement pole piece P1.
  • a release agent is applied to the surface of the second isolation film S2 before the second isolation film collection mechanism 4 receives the second isolation film S2, so that the second isolation film S2 with the release agent applied to the surface is subsequently received by the second isolation film providing mechanism 31B Reuse, especially when the second isolation film providing mechanism 31B is in the form of a roller, after the second isolation film S2 with a release agent applied on the surface is wound up, the rolled second isolation film S2 can be provided by the second isolation film again The mechanism 31B is utilized, thereby reducing costs.
  • the lithium supplement pole piece collecting mechanism 5 is located downstream of the two pressing rollers 11.
  • the lithium supplement pole piece collecting mechanism 5 is used to collect the pole piece P0 (ie, the lithium supplement pole piece P1) with the lithium foil L1 adhered to the active material layer P02.
  • the lithium supplement pole piece collecting mechanism 5 is a roller, and the lithium supplement pole piece collecting mechanism 5 is used to wind up the lithium supplement pole piece P1.
  • the mechanism 3 for forming the lithium film and the second isolation film collecting mechanism 4 are correspondingly set up as follows depending on the active material layer P02 being arranged on one or both surfaces of the current collector P01 One group or two groups.
  • the mechanism 3 for forming the lithium film and the second isolation film collecting mechanism 4 are set as a group, to realize the single-sided lithium replenishment of the pole piece P0
  • the mechanism 3 for forming the lithium film and the second isolation film collecting mechanism 4 are arranged in two groups as shown in FIG. 1, so as to realize the pole piece P0 The double-sided lithium supplement.
  • the first embodiment of the device for replenishing lithium on pole piece shown in Fig. 1 realizes continuous replenishment of lithium on pole piece P0.
  • Fig. 2 is a schematic diagram of a second embodiment of a device for replenishing lithium on pole pieces according to the invention. Note that the components having the same structure as the components of the first embodiment are denoted by the same reference numerals and their description is omitted. In addition, the description of the same actions and effects as the first embodiment will be omitted.
  • the lubricating substance applying mechanism 32 is used to feed the second isolation film S2 before the two rolls 34 A lubricating substance (not shown) is applied to the surface facing the lithium belt L0.
  • the lubricating substance applying mechanism 32 is used to apply the lubricating substance to the surface of the second separation film S2 in an intermittent manner.
  • the lubricating substance applying mechanism 32 intermittently applies the lubricating substance to the surface of the second isolation film S2 facing the lithium ribbon L0, and the two rolls 34 are used to roll the first isolation film S1, the lithium ribbon L0, and the second isolation film S2
  • the lithium tape L0 is rolled into a lithium foil L1 and the lithium foil L1 is intermittently adhered to the second isolation film S2 to form a lithium film C.
  • the lithium foil L1 that is not attached to the second isolation film S2 intermittently Adhere to the first isolation film S1.
  • the active material layer P02 is intermittently distributed on the surface of the current collector P01.
  • the second embodiment of the device for replenishing lithium on pole pieces shown in FIG. 2 realizes intermittent replenishment of lithium on pole pieces P0.
  • Fig. 3 is a schematic diagram of a third embodiment of a device for replenishing lithium on pole pieces according to the invention. Note that the components having the same structure as the components of the second embodiment are denoted by the same reference numerals and their description is omitted. In addition, the description of the same actions and effects as the second embodiment will be omitted.
  • the lubricating substance applying mechanism 32 is used to feed the first isolation film S1 and the first isolation film S1 before entering the two rolls 34.
  • a lubricating substance (not shown) is applied to the surface of the second separation film S2 facing the lithium belt L0.
  • the lubricating substance applying mechanism 32 applies the lubricating substance to the surface of the second separation film S2 in an intermittent manner.
  • the lubricating substance applying mechanism 32 also applies the lubricating substance to the surface of the first isolation film S1 in an intermittent manner, but the lubricating substance applied to the surface of the first isolation film S1 facing the lithium belt L0 is different from the lubricating substance applied to the surface of the first isolation film S1.
  • the lubricating substance on the surface of the two separation films S2 facing the lithium belt L0 alternately enters between the two rolls 34.
  • one of the two lubricating substance applying mechanisms 32 intermittently applies the lubricating substance to the surface of the first separator S1 facing the lithium belt L0
  • the other of the two lubricating substance applying mechanisms 32 intermittently applies the lubricating substance to the surface of the second separator S2 facing the lithium belt L0
  • the lubricity applied to the surface of the first separator S1 facing the lithium belt L0 The substance and the lubricating substance applied on the surface of the second separation film S2 facing the lithium belt L0 alternately enter between the two rollers 34.
  • the lubricating substance applied on the surface of the first isolation film S1 facing the lithium ribbon L0 and the lubricating substance applied on the surface of the second isolation film S2 facing the lithium ribbon L0 may be the same or different.
  • two lubricating substance applying mechanisms 32 are shown, they can be combined into one and providing different coating ports and control mechanisms, so as to realize the use of one lubricating substance applying mechanism 32 to the first isolation film S1 and the second separation film S2 are coated with a lubricating substance.
  • the third embodiment of the device for replenishing lithium on a pole piece shown in FIG. 3 also realizes intermittent recharge of lithium on the pole piece P0.
  • the lubricating substance applying mechanism 32, the first release agent providing mechanism 36A, and/or the second release agent providing mechanism 36B are coating mechanisms.
  • the coating mechanism may be a gravure coating mechanism M1, a transfer coating mechanism M2 or an extrusion coating mechanism M3.
  • Fig. 4 is a schematic diagram of a first embodiment of a coating mechanism of a device for replenishing lithium on pole pieces according to the present application.
  • the coating mechanism in FIG. 4 is a gravure coating mechanism M1.
  • the gravure coating mechanism M1 includes a storage groove M11 and a gravure roll M12.
  • the storage groove M11 is used to contain the corresponding lubricating substance or release agent, and the gravure roll M12 is used to interact with the corresponding isolation film (ie, the first isolation film S1 or the second The isolation film S2) is adjacent; the gravure roll M12 has recesses M121 arranged at intervals in the circumferential direction and extending in the circumferential direction.
  • the gravure roll M12 is used to remove the corresponding lubricating substance or release the film from the receiving groove M11 through the recesses M121 when rotating
  • the agent is drawn and coated on the corresponding surface of the corresponding isolation film (ie, the first isolation film S1 or the second isolation film S2).
  • the gravure roller M12 rotates regularly to achieve intermittent coating.
  • the gravure roll M12 continuously rotates to achieve continuous coating.
  • Fig. 5 is a schematic diagram of a second embodiment of the coating mechanism of the device for replenishing lithium on pole pieces according to the present application.
  • the coating mechanism in FIG. 5 is a transfer coating mechanism M2.
  • the transfer coating mechanism M2 includes a doctor blade M21 and a transfer roller M22.
  • the doctor blade M21 is used to contain the corresponding lubricating substance or release agent and is adjacent to the transfer roller M22.
  • the transfer roller M22 is used to connect to the corresponding isolation film (ie, the first isolation film).
  • the film S1 or the second isolation film S2) are adjacent; the scraper M21 is used to transfer the corresponding lubricating substance or release agent on the surface of the transfer roller M22, and transfer the corresponding lubricating substance or the corresponding lubricating substance on the surface of the transfer roller M22
  • the release agent contacts and coats the corresponding surface of the corresponding isolation film (ie, the first isolation film S1 or the second isolation film S2).
  • the doctor blade M21 can be bounced off regularly to achieve intermittent coating. The doctor blade M21 does not bounce off to achieve continuous coating.
  • FIG. 6 is a schematic diagram of a third embodiment of the coating mechanism of the device for replenishing lithium on pole pieces according to the present application.
  • the coating mechanism in FIG. 6 is an extrusion coating mechanism M3.
  • the extrusion coating mechanism M3 includes a containment tank M31, a screw pump M32 and a coating head M33.
  • the containment tank M31 is used to contain the corresponding lubricating substance or mold release agent, and the screw pump M32 is used to release the corresponding lubricating substance or mold release
  • the agent is delivered to the coating head M33, and the coating head M33 is used to apply the corresponding lubricating substance or release agent to the corresponding isolation film (ie, the first isolation film S1 or the second isolation film S2).
  • the coating head M33 can be set with timing feed and exit modes to achieve intermittent coating.
  • the coating head M33 sets a continuous feed mode to achieve continuous coating.
  • the lubricating substance applying mechanism 32 is used to face the lithium ribbon L0 toward the first isolation film S1 and/or the second isolation film S2 before entering the two rolls 34.
  • Lubricating material is applied to the surface of the two rollers 34, the rolling force between the two rollers 34 can be reduced, which can reduce the damage of the rollers to the first isolation film S1 and the second isolation film S2 when the lithium strip L0 is rolled into the lithium foil L1. Reuse of the first isolation film S1 and the second isolation film S2.
  • the method for forming a lithium film includes the following steps: providing a first isolation film, a second isolation film, and a lithium tape; and providing the first isolation film and/or the second isolation film Lubricating substance is applied to the surface of the; the lithium belt is located between the first isolation film and the second isolation film, wherein the first isolation film and/or the second isolation film is provided with lubricity
  • the surface of the substance faces the lithium tape; the first isolation film, the lithium tape, and the second isolation film are rolled to roll the lithium tape into a lithium foil and make the lithium foil adhere to A lithium film is formed on the second isolation film.
  • the method for replenishing lithium for pole pieces further includes recovering the first isolation film.
  • the method for forming the lithium film before rolling the first isolation film, the lithium ribbon, and the second isolation film, the method for forming the lithium film further includes facing the first isolation film The surface of the lithium belt provides a release agent.
  • the application of the lubricating substance to the surface entering the second isolation membrane is performed in an intermittent manner.
  • the pole piece includes a current collector and an active material layer disposed on the surface of the current collector
  • the method for replenishing lithium on a pole piece includes: Provide the pole piece with the lithium film prepared by the method for forming a lithium film as described above; calender the lithium film and the pole piece so that the lithium foil in the lithium film adheres to the active On the physical layer.
  • the method for replenishing lithium for the pole piece further includes recovering the second isolation film.
  • the method for replenishing lithium on the pole piece further includes collecting the pole piece with the lithium foil adhered to the active material layer.
  • the active material layer is provided on both surfaces of the current collector, and the providing the lithium film to the pole piece includes providing the lithium film to both surfaces of the pole piece.
  • the method for replenishing lithium of a pole piece before the second isolation film is collected, the method for replenishing lithium of a pole piece further includes: providing a release agent to the surface of the second isolation film facing the lithium replenishing pole piece, and The lithium supplement pole piece is formed by adhering the lithium foil to the active material layer.

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Abstract

用于锂膜成形的机构、方法以及用于极片补锂的装置、方法，用于锂膜成形的机构包括第一隔离膜提供机构（31A）、第二隔离膜提供机构（32A）、润滑性物质施加机构（32）、锂带提供机构（33）以及两个轧辊（34），第一隔离膜提供机构向两个轧辊提供第一隔离膜（S1），第二隔离膜提供机构向两个轧辊提供第二隔离膜（S2），锂带提供机构使锂带（L0）位于第一隔离膜和第二隔离膜之间，并向两个轧辊提供锂带，润滑性物质施加机构向进入两个轧辊之前的第一隔离膜和/或第二隔离膜面向锂带的表面施加润滑性物质，两个轧辊轧制第一隔离膜、锂带及第二隔离膜，以将锂带轧制成锂箔（L1）且使锂箔粘附在第二隔离膜上而形成锂膜（C）。通过设置润滑性物质施加机构，轧制力降低，实现隔离膜的重复利用。

Description

用于锂膜成形的机构、方法以及用于极片补锂的装置、方法
本申请要求于2019年07月05日提交中国专利局、申请号为201910605908.8、申请名称为“用于锂膜成形的机构以及用于极片补锂的装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施方式涉及电化学领域，特别是涉及用于锂膜成形的机构、方法以及用于极片补锂的装置、方法。
背景技术
随着新能源汽车的普及，对其动力电池的要求也越来越严格；比如要求电池既要拥有高能量密度，长循环和稳定的性能，同时还要有快速充电的能力。
目前可以通过极片补锂来改善电池的循环性能以及提高能量密度。通常在极片补锂技术中，两个隔离膜夹着锂带进入两个轧辊进行轧制以将锂带轧制成锂箔并使锂箔粘附在其中一个隔离膜上，之后将携带锂箔的隔离膜与极片进行压延，使锂箔脱离隔离膜并粘附到极片上，从而形成补锂极片。在锂箔粘附在其中一个隔离膜上的过程中，由于两个轧辊与两个隔离膜之间是在干摩擦状态下进行轧制，轧制力大，锂带轧制成锂箔时对两个隔离膜的损伤也会大，隔离膜消耗量巨大。
发明内容
鉴于现有技术中存在的问题，本申请的目的在于提供一种用于锂膜成形的机构、方法以及一种用于极片补锂的装置、方法，其能实现隔离膜的重复利用，降低补锂的成本。
为了实现上述目的，本申请实施方式采用的一个技术方案是：在第一方面，本申请提供了一种用于锂膜成形的机构，所述用于锂膜成形的机构包括第一隔离膜提供机构、第二隔离膜提供机构、润滑性物质施加 机构、锂带提供机构以及两个轧辊；所述第一隔离膜提供机构位于所述两个轧辊的上游，所述第一隔离膜提供机构用于向所述两个轧辊之间提供第一隔离膜；所述第二隔离膜提供机构位于所述两个轧辊的上游，所述第二隔离膜提供机构用于向所述两个轧辊之间提供第二隔离膜；所述锂带提供机构位于所述两个轧辊的上游，所述锂带提供机构能够使锂带位于所述第一隔离膜和所述第二隔离膜之间，并用于向所述两个轧辊之间提供锂带；所述润滑性物质施加机构位于所述两个轧辊的上游，所述润滑性物质施加机构用于向进入所述两个轧辊之前的所述第一隔离膜和/或所述第二隔离膜面向所述锂带的表面施加润滑性物质，所述两个轧辊用于轧制所述第一隔离膜、所述锂带以及所述第二隔离膜，以将所述锂带轧制成锂箔且使所述锂箔粘附在所述第二隔离膜上而形成锂膜。
在一实施例中，所述润滑性物质施加机构为涂布机构。
在一实施例中，所述用于锂膜成形的机构还包括第一隔离膜收取机构；所述第一隔离膜收取机构位于所述两个轧辊的下游，所述第一隔离膜收取机构用于收取穿过所述两个轧辊之间的所述第一隔离膜。
在一实施例中，所述用于锂膜成形的机构还包括第一脱模剂提供机构；所述第一脱模剂提供机构位于所述两个轧辊与所述第一隔离膜收取机构之间，所述第一脱模剂提供机构用于向所述第一隔离膜的面向锂带的表面提供脱模剂。
在一实施例中，所述第一脱模剂提供机构为涂布机构。
在一实施例中，向进入所述两个轧辊之前的所述第二隔离膜面向所述锂带的表面施加润滑性物质以间断性的方式进行。
为了实现上述目的，在第二方面，本申请提供了一种用于极片补锂的装置，极片包括集流体以及设置在所述集流体表面上的活性物质层，所述用于极片补锂的装置包括辊压机构以及极片提供机构；所述辊压机构包括两个压辊；所述极片提供机构位于所述两个压辊的上游，所述极片提供机构用于向所述两个压辊之间提供极片；所述用于极片补锂的装置还包括根据本申请第一方面所述的用于锂膜成形的机构，所述用于锂膜成形的机构位于所述两个压辊的上游，所述辊压机构用于压延所述锂 膜以及所述极片，以使所述锂膜中的锂箔粘附到所述活性物质层上。
在一实施例中，所述用于极片补锂的装置还包括第二隔离膜收取机构；所述第二隔离膜收取机构位于所述两个压辊的下游，所述第二隔离膜收取机构用于使所述锂膜穿过所述两个压辊之间并收取穿过所述两个压辊之间的锂膜中的第二隔离膜。
在一实施例中，所述用于极片补锂的装置还包括补锂极片收取机构；所述补锂极片收取机构位于所述两个压辊的下游，所述补锂极片收取机构用于将所述活性物质层粘附有所述锂箔的极片收取。
在一实施例中，所述用于锂膜成形的机构和所述第二隔离膜收取机构为两组，以向所述极片的两表面提供所述锂箔。
在一实施例中，所述用于极片补锂的装置还包括设置在所述两个压辊与所述第二隔离膜收取机构之间的用于向所述第二隔离膜的面向补锂极片的表面提供脱模剂的第二脱模剂提供机构，所述补锂极片由所述锂箔粘附到所述活性物质层上而形成。
本申请实施方式的有益效果是：通过润滑性物质施加机构用于向进入两个轧辊之前的第一隔离膜和/或第二隔离膜面向锂带的表面施加润滑性物质，两个轧辊之间的轧制力能够显著降低，从而可以减少锂带轧制成锂箔时轧辊对第一隔离膜和第二隔离膜的损伤，实现第一隔离膜和第二隔离膜的重复利用，降低补锂成本。
为了实现上述目的，在第三方面，本申请提供了一种用于锂膜成形的方法，包括：提供第一隔离膜、第二隔离膜以及锂带；向所述第一隔离膜和/或所述第二隔离膜的表面施加润滑性物质；使所述锂带位于所述第一隔离膜和所述第二隔离膜之间，其中，所述第一隔离膜和/或所述第二隔离膜施加有润滑性物质的表面面向所述锂带；轧制所述第一隔离膜、所述锂带以及所述第二隔离膜，以将所述锂带轧制成锂箔且使所述锂箔粘附在所述第二隔离膜上而形成锂膜。
在一些实施例中，在轧制所述第一隔离膜、所述锂带以及所述第二隔离膜之后，所述用于极片补锂的方法还包括，收取所述第一隔离膜。
在一些实施例中，在轧制所述第一隔离膜、所述锂带以及所述第二隔离膜之前，所述用于锂膜成形的方法还包括，向所述第一隔离膜的面 向所述锂带的表面提供脱模剂。
在一些实施例中，向进入所述第二隔离膜的表面施加润滑性物质以间断性的方式进行。
为了实现上述目的，在第四方面，本申请提供了一种用于极片补锂的方法，所述极片包括集流体以及设置在所述集流体表面上的活性物质层，所述用于极片补锂的方法包括：向所述极片提供如上所述的用于锂膜成形的方法所制备的锂膜；压延所述锂膜以及所述极片，以使所述锂膜中的锂箔粘附到所述活性物质层上。
在一些实施例中，在压延所述锂膜以及所述极片之后，所述用于极片补锂的方法还包括，收取所述第二隔离膜。
在一些实施例中，在压延所述锂膜以及所述极片之后，所述用于极片补锂的方法还包括，将所述活性物质层粘附有所述锂箔的极片收取。
在一些实施例中，所述活性物质层设置在所述集流体的两个表面，所述向所述极片提供所述锂膜包括，向所述极片的两表面提供所述锂膜。
在一些实施例中，在收取所述第二隔离膜之前，所述用于极片补锂的方法还包括：向所述第二隔离膜的面向补锂极片的表面提供脱模剂，所述补锂极片由所述锂箔粘附到所述活性物质层上而形成。
本申请实施方式的有益效果是：通过向第一隔离膜和/或第二隔离膜的表面施加润滑性物质，在轧制第一隔离膜、锂带以及第二隔离膜时，所述第一隔离膜和/或所述第二隔离膜施加有润滑性物质的表面面向所述锂带，轧制第一隔离膜、锂带以及第二隔离膜所需要的轧制力能够显著降低，从而可以减少锂带轧制成锂箔时对第一隔离膜和第二隔离膜的损伤，实现第一隔离膜和第二隔离膜的重复利用，降低补锂成本。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍。显而易见地，下面所描述的附图仅仅是本申请的一些实施例，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的附图。
图1是根据本申请的用于极片补锂的装置的第一实施例的示意图。
图2是根据本申请的用于极片补锂的装置的第二实施例的示意图。
图3是根据本申请的用于极片补锂的装置的第三实施例的示意图。
图4是根据本申请的用于极片补锂的装置的涂布机构的第一实施例的示意图。
图5是根据本申请的用于极片补锂的装置的涂布机构的第二实施例的示意图。
图6是根据本申请的用于极片补锂的装置的涂布机构的第三实施例的示意图。
其中，附图标记说明如下：
1辊压机构                             P01集流体
11压辊                                P02的活性物质层
2极片提供机构                         P1补锂极片
3用于锂膜成形的机构                   M1凹版涂布机构
31A第一隔离膜提供机构                 M11收容槽
31B第二隔离膜提供机构                 M12凹版辊
32润滑性物质施加机构                  M121凹部
33锂带提供机构                        M2转移涂布机构
34轧辊                                M21刮刀
35第一隔离膜收取机构                  M22转移辊
36A第一脱模剂提供机构                 M3挤压涂布机构
36B第二脱模剂提供机构                 M31收容罐
S1第一隔离膜                          M32螺杆泵
S2第二隔离膜                          M33涂布头
L0锂带                                4第二隔离膜收取机构
L1锂箔                                5补锂极片收取机构
C锂膜
P0极片
具体实施方式
附图示出本申请的实施例，且将理解的是，所公开的实施例仅仅是 本申请的示例，本申请可以以各种形式实施，因此，本文公开的具体细节不应被解释为限制，而是仅作为权利要求的基础且作为表示性的基础用于教导本领域普通技术人员以各种方式实施本申请。
此外，诸如上、下、左、右、前和后等用于说明实施例中的各构件的操作和构造的指示方向的表述不是绝对的而是相对的，且尽管各构件处于图中所示的位置时这些指示是恰当的，但是当这些位置改变时，这些方向应有不同的解释，以对应所述改变。
图1是根据本申请的用于极片补锂的装置的第一实施例的示意图。
如图1所示，用于极片补锂的装置包括辊压机构1、极片提供机构2、用于锂膜成形的机构3。依据实际情况，用于极片补锂的装置还可包括第二隔离膜收取机构4。依据实际情况，用于极片补锂的装置还包括补锂极片收取机构5。其中，极片P0包括集流体P01以及设置在集流体P01表面上的活性物质层P02。
辊压机构1包括两个压辊11。
极片提供机构2位于两个压辊11的上游。极片提供机构2用于向两个压辊11之间提供极片P0，如图1所示，极片提供机构2可为辊子，从而极片提供机构2用于将卷料形式的极片P0进行放卷。活性物质层P02连续地分布在集流体P01的表面上。
用于锂膜成形的机构3位于两个压辊11的上游。用于锂膜成形的机构3包括第一隔离膜提供机构31A、第二隔离膜提供机构31B、润滑性物质施加机构32、锂带提供机构33、两个轧辊34。依据实际情况，用于锂膜成形的机构3还可包括第一隔离膜收取机构35。依据实际情况，用于锂膜成形的机构3还可包括第一脱模剂提供机构36A。
第一隔离膜提供机构31A位于两个轧辊34的上游。第一隔离膜提供机构31A用于向两个轧辊34之间提供第一隔离膜S1。如图1所示，第一隔离膜提供机构31A为辊子，从而第一隔离膜提供机构31A用于将卷料形式的第一隔离膜S1进行放卷。
第二隔离膜提供机构31B位于两个轧辊34的上游。第二隔离膜提供机构31B用于向两个轧辊34之间提供第二隔离膜S2。如图1所示， 第二隔离膜提供机构31B可为辊子，从而第二隔离膜提供机构31B用于将卷料形式的第二隔离膜S2进行放卷。其中，第二隔离膜S2的表面粗糙度大于第一隔离膜S1的表面粗糙度。
润滑性物质施加机构32位于两个轧辊34的上游。润滑性物质施加机构32用于向进入两个轧辊34之前的第一隔离膜S1的面向锂带L0的表面施加润滑性物质(未示出)。润滑性物质施加机构32向第一隔离膜S1的表面施加润滑性物质可以以连续方式进行。
锂带提供机构33位于两个轧辊34的上游。锂带提供机构33能够使锂带L0位于第一隔离膜S1和第二隔离膜S2之间，并用于向两个轧辊34之间提供锂带L0。如图1所示，锂带提供机构33为辊子，从而锂带提供机构33用于将卷料形式的锂带L0放卷。
两个轧辊34用于轧制第一隔离膜S1、锂带L0以及第二隔离膜S2，以将锂带L0轧制成锂箔L1且使锂箔L1粘附在第二隔离膜S2上而形成锂膜C。在图1中，两个轧辊34将进入两个轧辊34之间的第一隔离膜S1、锂带L0以及第二隔离膜S2轧制以使锂带L0变成锂箔L1并使锂箔L1连续粘附在第二隔离膜S2上而形成锂膜C。
第一隔离膜收取机构35位于两个轧辊34的下游。第一隔离膜收取机构35用于收取穿过两个轧辊34之间的第一隔离膜S1。如图1所示，第一隔离膜收取机构35为辊子，从而第一隔离膜收取机构35用于将第一隔离膜S1收卷。
第一脱模剂提供机构36A位于两个轧辊34与第一隔离膜收取机构35之间，第一脱模剂提供机构36A用于第一隔离膜S1的面向锂带L0的表面提供脱模剂(未示出)。第一脱模剂提供机构36A在第一隔离膜收取机构35收取第一隔离膜S1之前对第一隔离膜S1的表面施加脱模剂，以便表面施加有脱模剂的第一隔离膜S1后续被第一隔离膜提供机构31A重复利用，尤其是第一隔离膜收取机构35为辊子形式时，表面施加有脱模剂的第一隔离膜S1收卷结束后，成卷的第一隔离膜S1能够再次被第一隔离膜提供机构31A利用，从而降低了成本。
辊压机构1用于压延锂膜C以及极片P0，以使锂膜C中的锂箔L1 粘附到活性物质层P02上而形成补锂极片P1。
第二隔离膜收取机构4位于两个压辊11的下游。第二隔离膜收取机构4用于使锂膜C穿过两个压辊11之间并收取穿过两个压辊11之间的锂膜C中的第二隔离膜S2。在图1中，第二隔离膜收取机构4为辊子，第二隔离膜收取机构4用于将第二隔离膜S2收卷，同时第二隔离膜收取机构4对穿过两个压辊11之间的锂膜C中的第二隔离膜S2提供牵引力。与第一隔离膜S1仅经过两个轧辊34的轧制相比，第二隔离膜S2经过两个轧辊34的轧制以及两个压辊11的压延，会在受损程度上加大，但若第二隔离膜S2的性能依然良好，同样地，可在两个压辊11和第二隔离膜收取机构4之间也设置第二脱模剂提供机构36B，该第二脱模剂提供机构36B用于向第二隔离膜S2的面向补锂极片P1的表面提供脱模剂。在第二隔离膜收取机构4收取第二隔离膜S2之前对第二隔离膜S2的表面施加脱模剂，以便表面施加有脱模剂的第二隔离膜S2后续被第二隔离膜提供机构31B重复利用，尤其是第二隔离膜提供机构31B为辊子形式时，表面施加有脱模剂的第二隔离膜S2收卷结束后，成卷的第二隔离膜S2能够再次被第二隔离膜提供机构31B利用，从而降低了成本。
补锂极片收取机构5位于两个压辊11的下游。补锂极片收取机构5用于将活性物质层P02粘附有锂箔L1的极片P0(即补锂极片P1)收取。在图1中，补锂极片收取机构5为辊子，补锂极片收取机构5用于将补锂极片P1收卷。
在图1所示的第一实施例中，用于锂膜成形的机构3和第二隔离膜收取机构4依据活性物质层P02设置在集流体P01的一个或两个表面上而对应地设置为一组或两组。换句话说，当活性物质层P02设置在集流体P01的一个表面上时，用于锂膜成形的机构3和第二隔离膜收取机构4设置为一组，实现极片P0的单面补锂；当活性物质层P02设置在集流体P01的两个表面上时，用于锂膜成形的机构3和第二隔离膜收取机构4设置为如图1所示的两组，从而实现极片P0的双面补锂。
图1所示的用于极片补锂的装置的第一实施例实现极片P0的连续 性地补锂。
图2是根据发明的用于极片补锂的装置的第二实施例的示意图。注意的是，具有与第一实施例的部件相同的结构的部件通过由相同的附图标记表示而省略其说明。此外，与第一实施例相同的动作和作用的说明将省略。
与图1的用于极片补锂的装置的第一实施例不同的是：在第二实施例中，润滑性物质施加机构32用于向进入两个轧辊34之前的第二隔离膜S2的面向锂带L0的表面施加润滑性物质(未示出)。润滑性物质施加机构32用于向第二隔离膜S2的表面施加润滑性物质以间断性的方式进行。润滑性物质施加机构32向第二隔离膜S2的面向锂带L0的表面间断性地施加润滑性物质，两个轧辊34用于轧制第一隔离膜S1、锂带L0以及第二隔离膜S2以将锂带L0轧制成锂箔L1并使锂箔L1间断性地粘附在第二隔离膜S2上而形成锂膜C，未附着在第二隔离膜S2上的锂箔L1间断性地粘附在第一隔离膜S1上。活性物质层P02间断性地分布在集流体P01的表面上。
图2所示的用于极片补锂的装置的第二实施例实现极片P0的间歇性地补锂。
图3是根据发明的用于极片补锂的装置的第三实施例的示意图。注意的是，具有与第二实施例的部件相同的结构的部件通过由相同的附图标记表示而省略其说明。此外，与第二实施例相同的动作和作用的说明将省略。
与图2的用于极片补锂的装置的第二实施例不同的是：在第三实施例中，润滑性物质施加机构32用于向进入两个轧辊34之前的第一隔离膜S1和第二隔离膜S2的面向锂带L0的表面均施加润滑性物质(未示出)。润滑性物质施加机构32向第二隔离膜S2的表面施加润滑性物质以间断性地方式进行。润滑性物质施加机构32向第一隔离膜S1的表面施加润滑性物质也以间断性地方式进行，但是施加在第一隔离膜S1的面向锂带L0的表面上的润滑性物质与施加在第二隔离膜S2的面向锂带L0的表面上的润滑性物质交替进入两个轧辊34之间。在图3中，存在 有两个润滑性物质施加机构32，具体地，两个润滑性物质施加机构32的一个向第一隔离膜S1的面向锂带L0的表面间断性地施加润滑性物质，两个润滑性物质施加机构32的另一个向第二隔离膜S2的面向锂带L0的表面间断性地施加润滑性物质，施加在第一隔离膜S1的面向锂带L0的表面上的润滑性物质与施加在第二隔离膜S2的面向锂带L0的表面上的润滑性物质交替进入两个轧辊34之间。注意的是，施加在第一隔离膜S1的面向锂带L0的表面上的润滑性物质与施加在第二隔离膜S2的面向锂带L0的表面上的润滑性物质可以相同也可以不同。在图3中，尽管示出了两个润滑性物质施加机构32，但是它们可以合为一个并设置不同的涂布口和控制机构，从而实现采用一个润滑性物质施加机构32对第一隔离膜S1和第二隔离膜S2进行润滑性物质的涂布。
与图2所示的第二实施例一样，图3所示的用于极片补锂的装置的第三实施例也实现极片P0的间歇性地补锂。
在图1至图3所示的实施例中，润滑性物质施加机构32、第一脱模剂提供机构36A和/或第二脱模剂提供机构36B为涂布机构。涂布机构可为凹版涂布机构M1、转移涂布机构M2或挤压涂布机构M3。
图4是根据本申请的用于极片补锂的装置的涂布机构的第一实施例的示意图。
图4的涂布机构为凹版涂布机构M1。凹版涂布机构M1包括收容槽M11以及凹版辊M12，收容槽M11用于收容对应的润滑性物质或脱模剂，凹版辊M12用于与对应的隔离膜(即第一隔离膜S1或第二隔离膜S2)相邻；凹版辊M12具有沿周向间隔设置且沿周向延伸的凹部M121，凹版辊M12用于在旋转时通过凹部M121从收容槽M11中将对应的润滑性物质或脱膜剂汲取并涂布在对应的隔离膜(即第一隔离膜S1或第二隔离膜S2)的对应的表面上。凹版辊M12定时旋转，以实现间歇涂布。凹版辊M12连续旋转，以实现连续涂布。
图5是根据本申请的用于极片补锂的装置的涂布机构的第二实施例的示意图。
图5的涂布机构为转移涂布机构M2。转移涂布机构M2包括刮刀M21 以及转移辊M22，刮刀M21用于收容对应的润滑性物质或脱模剂并与转移辊M22相邻，转移辊M22用于与对应的隔离膜(即第一隔离膜S1或第二隔离膜S2)相邻；刮刀M21用于将对应的润滑性物质或脱膜剂转移在转移辊M22的表面上，转移在转移辊M22的表面上的对应的润滑性物质或脱膜剂接触并涂覆到对应的隔离膜(即第一隔离膜S1或第二隔离膜S2)的对应的表面上。刮刀M21能够定时弹开以实现间断性涂布。刮刀M21不弹开以实现连续性涂布。
图6是根据本申请的用于极片补锂的装置的涂布机构的第三实施例的示意图。
图6的涂布机构为挤压涂布机构M3。挤压涂布机构M3包括收容罐M31、螺杆泵M32以及涂布头M33，收容罐M31用于收容对应的润滑性物质或脱模剂，螺杆泵M32用于将对应的润滑性物质或脱模剂输送至涂布头M33，涂布头M33用于将对应的润滑性物质或脱模剂涂覆到对应的隔离膜(即第一隔离膜S1或第二隔离膜S2)。涂布头M33可设置定时进刀和退刀模式，以实现间断性涂布。涂布头M33设置连续进刀模式，以实现连续性涂布。
综上所述，在图1至图3的实施例中，通过润滑性物质施加机构32用于向进入两个轧辊34之前的第一隔离膜S1和/或第二隔离膜S2面向锂带L0的表面施加润滑性物质，两个轧辊34之间的轧制力能够降低，从而可以减少锂带L0轧制成锂箔L1时轧辊对第一隔离膜S1和第二隔离膜S2的损伤，实现第一隔离膜S1和第二隔离膜S2的重复利用。
下面将描述本申请实施例的用于锂膜成形的方法，其中未详细描述的部分可参见前述各实施例。
本申请所提供的一种用于锂膜成形的方法，其包括如下步骤：提供第一隔离膜、第二隔离膜以及锂带；向所述第一隔离膜和/或所述第二隔离膜的表面施加润滑性物质；使所述锂带位于所述第一隔离膜和所述第二隔离膜之间，其中，所述第一隔离膜和/或所述第二隔离膜施加有润滑性物质的表面面向所述锂带；轧制所述第一隔离膜、所述锂带以及所述第二隔离膜，以将所述锂带轧制成锂箔且使所述锂箔粘附在所述第二隔 离膜上而形成锂膜。
在一些实施例中，在轧制所述第一隔离膜、所述锂带以及所述第二隔离膜之后，所述用于极片补锂的方法还包括，收取所述第一隔离膜。
在一些实施例中，在轧制所述第一隔离膜、所述锂带以及所述第二隔离膜之前，所述用于锂膜成形的方法还包括，向所述第一隔离膜的面向所述锂带的表面提供脱模剂。
在一些实施例中，向进入所述第二隔离膜的表面施加润滑性物质以间断性的方式进行。
下面将描述本申请实施例的用于极片补锂的方法，其中未详细描述的部分可参见前述各实施例。
在本申请提供的一种用于极片补锂的方法中，所述极片包括集流体以及设置在所述集流体表面上的活性物质层，所述用于极片补锂的方法包括：向所述极片提供如上所述的用于锂膜成形的方法所制备的锂膜；压延所述锂膜以及所述极片，以使所述锂膜中的锂箔粘附到所述活性物质层上。
在一些实施例中，在压延所述锂膜以及所述极片之后，所述用于极片补锂的方法还包括，收取所述第二隔离膜。
在一些实施例中，在压延所述锂膜以及所述极片之后，所述用于极片补锂的方法还包括，将所述活性物质层粘附有所述锂箔的极片收取。
在一些实施例中，所述活性物质层设置在所述集流体的两个表面，所述向所述极片提供所述锂膜包括，向所述极片的两表面提供所述锂膜。
在一些实施例中，在收取所述第二隔离膜之前，所述用于极片补锂的方法还包括：向所述第二隔离膜的面向补锂极片的表面提供脱模剂，所述补锂极片由所述锂箔粘附到所述活性物质层上而形成。
上面详细的说明描述多个示范性实施例，但本文不意欲限制到明确公开的组合。因此，除非另有说明，本文所公开的各种特征可以组合在一起而形成出于简明目的而未示出的多个另外组合。

Claims (14)

  1. 一种用于锂膜成形的机构(3)，其特征在于，
    所述用于锂膜成形的机构(3)包括第一隔离膜提供机构(31A)、第二隔离膜提供机构(31B)、润滑性物质施加机构(32)、锂带提供机构(33)以及两个轧辊(34)；
    所述第一隔离膜提供机构(31A)位于所述两个轧辊(34)的上游，所述第一隔离膜提供机构(31A)用于向所述两个轧辊(34)之间提供第一隔离膜(S1)；
    所述第二隔离膜提供机构(31B)位于所述两个轧辊(34)的上游，所述第二隔离膜提供机构(31B)用于向所述两个轧辊(34)之间提供第二隔离膜(S2)；
    所述锂带提供机构(33)位于所述两个轧辊(34)的上游，所述锂带提供机构(33)能够使锂带(L0)位于所述第一隔离膜(S1)和所述第二隔离膜(S2)之间，并用于向所述两个轧辊(34)之间提供锂带(L0)；
    所述润滑性物质施加机构(32)位于所述两个轧辊(34)的上游，所述润滑性物质施加机构(32)用于向进入所述两个轧辊(34)之前的所述第一隔离膜(S1)和/或所述第二隔离膜(S2)面向锂带(L0)的表面施加润滑性物质；
    所述两个轧辊(34)用于轧制所述第一隔离膜(S1)、所述锂带(L0)以及所述第二隔离膜(S2)，以将所述锂带(L0)轧制成锂箔(L1)且使所述锂箔(L1)粘附在所述第二隔离膜(S2)上而形成锂膜(C)。
  2. 根据权利要求1所述的用于锂膜成形的机构(3)，其特征在于，
    所述润滑性物质施加机构(32)为涂布机构。
  3. 根据权利要求1-2中任意一项所述的用于锂膜成形的机构(3)，其特征在于，
    所述用于锂膜成形的机构(3)还包括第一隔离膜收取机构(35)；
    所述第一隔离膜收取机构(35)位于所述两个轧辊(34)的下游，所述第一隔离膜收取机构(35)用于收取穿过所述两个轧辊(34)之间的所述第一隔离膜(S1)。
  4. 根据权利要求1至3中任意一项所述的用于锂膜成形的机构(3)，其特征在于，
    所述用于锂膜成形的机构(3)还包括第一脱模剂提供机构(36A)；
    所述第一脱模剂提供机构(36A)位于所述两个轧辊(34)与所述第一隔离膜收取机构(35)之间，所述第一脱模剂提供机构(36A)用于向所述第一隔离膜(S1)的面向所述锂带(L0)的表面提供脱模剂。
  5. 根据权利要求4所述的用于锂膜成形的机构(3)，其特征在于，所述第一脱模剂提供机构(36A)为涂布机构。
  6. 一种用于极片补锂的装置，极片(P0)包括集流体(P01)以及设置在所述集流体(P01)表面上的活性物质层(P02)，所述用于极片补锂的装置包括辊压机构(1)以及极片提供机构(2)；
    所述辊压机构(1)包括两个压辊(11)；
    所述极片提供机构(2)位于所述两个压辊(11)的上游，所述极片提供机构(2)用于向所述两个压辊(11)之间提供所述极片(P0)；
    其特征在于，
    所述用于极片补锂的装置还包括根据权利要求1-6中任一项所述的用于锂膜成形的机构(3)，所述用于锂膜成形的机构(3)位于所述两个压辊(11)的上游；
    所述辊压机构(1)用于压延所述锂膜(C)以及所述极片(P0)，以使所述锂膜(C)中的锂箔(L1)粘附到所述活性物质层(P02)上。
  7. 根据权利要求6所述的用于极片补锂的装置，其特征在于，
    所述用于极片补锂的装置还包括第二隔离膜收取机构(4)；
    所述第二隔离膜收取机构(4)位于所述两个压辊(11)的下游，所述第二隔离膜收取机构(4)用于使所述锂膜(C)穿过所述两个压辊(11)之间并收取穿过所述两个压辊(11)之间的锂膜(C)中的第二隔离膜(S2)。
  8. 根据权利要求6所述的用于极片补锂的装置，其特征在于，
    所述用于极片补锂的装置还包括补锂极片收取机构(5)；
    所述补锂极片收取机构(5)位于所述两个压辊(11)的下游，所述补锂极片收取机构(5)用于将所述活性物质层(P02)粘附有所述锂箔(L1)的极片(P0)收取。
  9. 根据权利要求6所述的用于极片补锂的装置，其特征在于，
    所述用于锂膜成形的机构(3)和所述第二隔离膜收取机构(4)为两组，以向所述极片(P0)的两表面提供所述锂箔(L1)。
  10. 根据权利要求7所述的用于极片补锂的装置，其特征在于，所述用于极片补锂的装置还包括设置在所述两个压辊(11)与所述第二隔离膜收取机构(4)之间的用于向所述第二隔离膜(S2)的面向补锂极片(P1)的表面提供脱模剂的第二脱模剂提供机构(36B)，所述补锂极片(P1)由所述锂箔(L1)粘附到所述活性物质层(P02)上而形成。
  11. 一种用于锂膜成形的方法，其特征在于，所述用于锂膜成形的方法包括：
    提供第一隔离膜、第二隔离膜以及锂带；
    向所述第一隔离膜和/或所述第二隔离膜的表面施加润滑性物质；
    使所述锂带位于所述第一隔离膜和所述第二隔离膜之间，其中，所述第一隔离膜和/或所述第二隔离膜施加有润滑性物质的表面面向所述锂带；
    轧制所述第一隔离膜、所述锂带以及所述第二隔离膜，以将所述锂带轧制成锂箔且使所述锂箔粘附在所述第二隔离膜上而形成锂膜。
  12. 一种用于极片补锂的方法，所述极片包括集流体以及设置在所述集流体表面上的活性物质层，其特征在于，所述用于极片补锂的方法包括：
    向所述极片提供根据权利要求11所述的用于锂膜成形的方法所制备的锂膜；
    压延所述锂膜以及所述极片，以使所述锂膜中的锂箔粘附到所述活性物质层上。
  13. 根据权利要求12所述的用于极片补锂的方法，其特征在于，在收取所述第二隔离膜之前，所述用于极片补锂的方法还包括：
    向所述第二隔离膜的面向补锂极片的表面提供脱模剂，所述补锂极片由所述锂箔粘附到所述活性物质层上而形成。
  14. 根据权利要求12或13所述的用于极片补锂的方法，其特征在于，所述活性物质层设置在所述集流体的两个表面，所述向所述极片提供所述锂膜包括，向所述极片的两表面提供所述锂膜。
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