WO2021004408A1 - 用于极片补锂的装置及方法 - Google Patents

用于极片补锂的装置及方法 Download PDF

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Publication number
WO2021004408A1
WO2021004408A1 PCT/CN2020/100293 CN2020100293W WO2021004408A1 WO 2021004408 A1 WO2021004408 A1 WO 2021004408A1 CN 2020100293 W CN2020100293 W CN 2020100293W WO 2021004408 A1 WO2021004408 A1 WO 2021004408A1
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WO
WIPO (PCT)
Prior art keywords
lithium
film
pole piece
replenishing
transfer film
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PCT/CN2020/100293
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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 EP20837643.4A priority Critical patent/EP3923384B1/en
Publication of WO2021004408A1 publication Critical patent/WO2021004408A1/zh
Priority to US17/568,852 priority patent/US11437608B2/en

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    • 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
    • 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
    • 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
    • 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
    • H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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, and in particular to a device and method for replenishing lithium on pole pieces.
  • the lithium film supply mechanism is used to provide lithium film.
  • the lithium film includes a transfer film and a lithium foil.
  • the foil is continuously adhered to the transfer film and faces the active material layer of the pole piece, which includes a current collector and an active material layer intermittently disposed on the surface of the current collector.
  • the rolling mechanism is used to roll the lithium film and the pole piece, and the lithium foil in the lithium film is intermittently adhered to the active material layer.
  • the lithium film is very thin, and the gap between the rollers of the rolling mechanism for pole piece calendering is also small, which easily causes the pole piece to be stressed during the lithium film calendering process. Deformed.
  • the purpose of this application is to provide a device and method for replenishing lithium on pole pieces, which can reduce the pressure of the lithium film during the process of replenishing lithium on pole pieces, thereby reducing lithium replenishment.
  • the later lithium supplement pole piece and the transfer film of the lithium film are damaged.
  • the present application provides a device for replenishing lithium on pole pieces, the pole pieces include a current collector and are intermittently arranged on the The active material layer on the surface of the current collector, the device for replenishing lithium with pole pieces includes a rolling mechanism, a pole piece providing mechanism, and a lithium film providing mechanism;
  • the rolling mechanism includes two pressing rollers;
  • the pole piece provides The mechanism is located upstream of the two pressing rollers, the pole piece providing mechanism is used to provide pole pieces between the two pressing rollers;
  • the lithium film providing mechanism is located upstream of the two pressing rollers, the The lithium film providing mechanism is used to provide a lithium film, and the lithium film includes a transfer film and a lithium foil;
  • the device for replenishing lithium on the pole piece also includes a strip providing mechanism; the strip providing mechanism is used to provide the lithium A tape is provided between the transfer film of the film and the pressing roller on the corresponding side thereof.
  • the tape includes a substrate and an adhesion layer intermittently disposed on the substrate.
  • the adhesion layer can interact with the active of the pole piece.
  • the material layer corresponds; the rolling mechanism is used for calendering the strip, 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 transfer film collection mechanism located downstream of the two pressure rollers, and the transfer film collection mechanism is used to transfer The transfer film of the two pressure rollers is collected.
  • the lithium film providing mechanism includes a rolling mechanism for adhering the lithium foil to the transfer film.
  • the lithium film providing mechanism further includes an auxiliary film providing mechanism located upstream of the rolling mechanism, and the auxiliary film providing mechanism is used to provide auxiliary film to the rolling mechanism. membrane.
  • the lithium film providing mechanism further includes an auxiliary film collecting mechanism, the auxiliary film collecting mechanism is located downstream of the rolling mechanism, and the auxiliary film collecting mechanism is used to collect through the rolling mechanism.
  • the auxiliary film is located downstream of the rolling mechanism, and the auxiliary film collecting mechanism is used to collect through the rolling mechanism.
  • the rolling mechanism includes a transfer film providing mechanism, a lithium belt providing mechanism, and two rolls.
  • the transfer film providing mechanism is used to provide a transfer film between the two rolls.
  • the providing mechanism is used to provide a lithium belt between the two rollers, and the two rollers are used to roll the lithium belt and the transfer film to roll the lithium belt into the lithium foil and make The lithium foil is continuously adhered to the transfer film to form the lithium film.
  • the strip supply mechanism includes a strip pay-out mechanism and a strip take-up mechanism which are respectively arranged upstream and downstream of the two pressure rollers, and the strip pay-out mechanism is used to send The pressure roller releases the strip, and the strip collection mechanism is used to collect the strip passing through the two pressure rollers.
  • the substrate and/or the adhesion layer have elasticity.
  • 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 lithium film supply mechanism, the transfer film collection mechanism, and the tape supply mechanism are correspondingly set as one according to the active material layer being disposed on one or both surfaces of the current collector. Group or two groups.
  • the beneficial effects of the present application are as follows: Compared with the background art, due to the arrangement of the strip providing mechanism, the strip provided by the strip providing mechanism can reduce the pressure of the lithium film during the process of replenishing the pole piece, thereby reducing the replenishment of lithium. The later lithium supplement pole piece and the transfer film of the lithium film are damaged.
  • the present application provides a method for replenishing lithium on a pole piece, the pole piece comprising a current collector and an active material layer intermittently disposed on the surface of the current collector, the The method for replenishing lithium on a pole piece includes: providing the pole piece, a lithium film, and a strip, so that the lithium film is located between the strip and the pole piece, and the lithium film includes a transfer film and a lithium foil
  • the tape includes a substrate and an adhesion layer intermittently disposed on the substrate, the adhesion layer can correspond to the active material layer of the pole piece; and the tape, the lithium film and the The pole piece is used to make the lithium foil in the lithium foil adhere to the active material layer.
  • the method for replenishing lithium on a pole piece before providing the lithium film, further includes adhering the lithium foil to the transfer film.
  • the adhering the lithium foil to the transfer film includes: providing a lithium tape, the transfer film, and an auxiliary film; rolling the lithium tape, the transfer film, and the auxiliary film
  • the lithium film is formed by rolling the lithium ribbon into the lithium foil and continuously adhering the lithium foil on the transfer film.
  • the lithium film, the transfer film, and the tape are correspondingly arranged in one group or two groups according to the active material layer being arranged on one or both surfaces of the current collector.
  • the beneficial effects of the present application are as follows: Compared with the background art, because the strip is provided, the strip lifting can reduce the pressure of the lithium film covering the pole piece in the process of replenishing lithium, thereby reducing the lithium replenishing pole piece after the lithium supplement The transfer film of lithium and lithium film is damaged.
  • 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 the rolling mechanism of the device for replenishing lithium on pole pieces according to the present application.
  • Fig. 3 is a schematic diagram of a second embodiment of a 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.
  • Fig. 2 is a schematic diagram of the rolling mechanism of the device for replenishing lithium on pole pieces according to the present application.
  • the device for replenishing lithium with pole pieces includes a rolling mechanism 1, a pole piece providing mechanism 2, and a lithium film providing mechanism 3.
  • the device for replenishing lithium on the pole piece may further include a transfer film collecting mechanism 5.
  • the device for replenishing lithium pole piece may further include a lithium replenishing pole piece collecting mechanism 6.
  • the pole piece P0 includes a current collector P01 and an active material layer P02 intermittently provided on the surface of the current collector P01.
  • a blank current collector region R that is, the part on the surface of the current collector P01 where the active material layer P02 is not provided.
  • the active material layers P02 on the two surfaces of the current collector P01 are symmetrically distributed relative to the current collector P01.
  • the active material layer P02 may be provided on only one surface of the current collector P01.
  • the pole piece providing mechanism 2 may be a roller, so that the pole piece providing mechanism 2 unwinds the pole piece P0 in the form of a roll.
  • the roller pressing mechanism 1 includes two pressing rollers 11. A gap G is left between the 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 lithium film supply mechanism 3 is located upstream of the two pressing rollers 11.
  • the lithium film providing mechanism 3 is used to provide the lithium film C.
  • the lithium film C includes a transfer film T and a lithium foil L1.
  • the lithium foil L1 is adhered to the transfer film T and faces the active material layer P02 of the pole piece P0. In FIG. 1, the lithium foil L1 is continuously adhered to the transfer film T.
  • the lithium film supply mechanism 3 includes a rolling mechanism 31. According to actual conditions, the lithium film providing mechanism 3 may further include an auxiliary film providing mechanism 32. According to actual conditions, the lithium film providing mechanism 3 may further include an auxiliary film collecting mechanism 33.
  • the rolling mechanism 31 is used to make the lithium foil L1 adhere to the transfer film T continuously.
  • the rolling mechanism 31 is used to continuously adhere the lithium foil L1 to the transfer film T.
  • the rolling mechanism 31 includes a transfer film providing mechanism 311, a lithium ribbon providing mechanism 312 and two rollers 313.
  • the transfer film supply mechanism 311 is used to supply the transfer film T between the two rolls 313.
  • the transfer film providing mechanism 311 is a roller, so the transfer film providing mechanism 311 is used to unwind the transfer film T in the form of a roll.
  • the lithium ribbon supply mechanism 312 is used to supply the lithium ribbon L0 between the two rolls 313. As shown in FIG.
  • the lithium belt providing mechanism 312 is a roller, so the lithium belt providing mechanism 312 is used to unwind the lithium belt L0 in the form of a roll.
  • the two rolls 313 are used to roll the lithium ribbon L0 and the transfer film T to roll the lithium ribbon L0 into a lithium foil L1 and adhere the lithium foil L1 on the transfer film T to form a lithium film C.
  • the adhesive force between the lithium foil L1 and the transfer film T is greater than the adhesive force between the lithium foil L1 and the nip roller 313 (located on the opposite side of the lithium foil L1 from the transfer film T).
  • two rolls 313 roll the lithium ribbon L0 into a lithium foil L1 and make the lithium foil L1 adhere to the transfer film T continuously.
  • the auxiliary film supply mechanism 32 is located upstream of the rolling mechanism 31.
  • the auxiliary film providing mechanism 32 is used to provide the auxiliary film A to the rolling mechanism 31 (specifically between the two rolls 313).
  • the adhesion force between the lithium foil L1 and the transfer film T is greater than the adhesion force between the lithium foil L1 and the auxiliary film A, so that the two rolls 313 will enter the lithium belt L0 and the transfer film between the two rolls 313.
  • T and the auxiliary film A are rolled to roll the lithium ribbon L0 into a lithium foil L1 and to continuously adhere the lithium foil L1 to the transfer film T to form the lithium film C.
  • the auxiliary film providing mechanism 32 is a roller, so the auxiliary film providing mechanism 32 is used to unwind the auxiliary film A in the form of a roll.
  • the auxiliary film take-up mechanism 33 is located downstream of the rolling mechanism 31.
  • the auxiliary film collecting mechanism 33 is used to collect the auxiliary film A passing through the rolling mechanism 31 (specifically between the two rollers 313) to recover the auxiliary film A and provide traction for the auxiliary film A at the same time.
  • the auxiliary film supply mechanism 32 and the auxiliary film take-up mechanism 33 can be omitted. In this case, it is only necessary that the adhesion between the lithium foil L1 and the transfer film T is greater than that between the lithium foil L1 and the roller 313 (located on the lithium foil L1 and the transfer The adhesive force of the side opposite to the film T) can realize the continuous adhesion of the lithium foil L1 to the transfer film T to form the lithium film C. As shown in FIG.
  • the auxiliary film take-up mechanism 33 is a roller, so the auxiliary film take-up mechanism 33 is used to wind the auxiliary film A.
  • the lithium film providing mechanism 3 is not limited to the example shown in FIG. 1, the lithium film C provided by the lithium film providing mechanism 3 may be a finished lithium film C, that is, an offline formed lithium film C product.
  • the tape supply mechanism 4 is used for supplying the tape S between the transfer film T of the lithium film C and the pressing roller 11 on the corresponding side.
  • the tape S includes a substrate S1 and an adhesion layer S2 intermittently provided on the substrate S1, and the adhesion layer S2 can correspond to the active material layer P02 of the pole piece P0.
  • the substrate S1 is located between the adhesion layer S2 and the transfer film T of the lithium film C, and the adhesion layer S2 is located between one of the pressing rollers 11 and the substrate S1.
  • any suitable well-known material can be selected as long as it has.
  • the material of the adhesion layer S2 can be any suitable well-known material, as long as it has.
  • the adhesion layer S2 can be provided by coating.
  • the strip supply mechanism 4 includes a strip discharge mechanism 41 and a strip take-up mechanism 42 located upstream and downstream of the two pressing rollers 11 respectively.
  • the strip unwinding mechanism 41 is used to unwind the strip S to the two pressing rollers 11.
  • the belt unwinding mechanism 41 is a roller, so the strip unwinding mechanism 41 is used to unwind the strip S in the form of a roll. volume.
  • the strip take-up mechanism 42 is used to take the strip S passing through the two pressing rollers, and at the same time provide the traction of the strip S.
  • the strip take-up mechanism 42 is a roller, so the strip take-up mechanism 42 is used to wind the strip S.
  • the size of the gap G between the two pressing rollers 11 is smaller than the sum of the thicknesses of the adhesion layer S2, the base material S1, the lithium film C, the current collector P01 and the active material layer P02, and is greater than the base material S1, the lithium film C and the collective The sum of the thickness of fluid P01.
  • the rolling mechanism 1 rolls the strip S, the lithium film C and the pole piece P0 in a state where the adhesion layer S2 corresponds to the active material layer P02 of the pole piece P0, and the lithium foil L1 in the lithium film C is intermittently adhered to the active material layer P02. On the material layer P02. On the other hand, the remaining part of the lithium foil L1 except for intermittently adhering to the active material layer P02 remains in the transfer film T intermittently.
  • the transfer film collecting mechanism 5 is located downstream of the two pressing rollers 11.
  • the transfer film collecting mechanism 5 is used to collect the transfer film T passing through the two pressing rollers 11 while providing the traction of the lithium film C. As shown in FIG. 1, the transfer film collecting mechanism 5 is a roller, so the transfer film collecting mechanism 5 winds the transfer film T.
  • the lithium supplement pole piece collecting mechanism 6 is located downstream of the two pressing rollers 11.
  • the lithium supplement pole piece collecting mechanism 6 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, and at the same time provide the traction force of the pole piece P0.
  • the lithium supplement pole piece collecting mechanism 6 is a roller, so the lithium supplement pole piece collecting mechanism 6 is used to wind up the lithium supplement pole piece P1.
  • the lithium film supply mechanism 3, the strip supply mechanism 4, and the transfer film collection mechanism 5 are correspondingly arranged in one group or two groups according to the active material layer P02 being arranged on one or both surfaces of the current collector P01.
  • the strip S provided by the strip providing mechanism 4 separates the transfer film T from the corresponding pressing roller 11, increasing the gap between the two pressing rollers 11 of the roller pressing mechanism 1.
  • the gap thereby reducing the pressure of the laminated lithium film C when the pole piece P0 is replenishing lithium, reduces the damage of the lithium replenishing pole piece P1 and the transfer film T of the lithium film after the lithium replenishment due to the large bonding force, ensuring the lithium replenishment electrode The quality of the piece P1.
  • the strip collection mechanism 42, the transfer film collection mechanism 5, and the lithium supplement pole piece collection mechanism 6 provide three traction forces for one side of the pole piece P0.
  • Fig. 3 is a schematic diagram of a second embodiment of a device for replenishing lithium on pole pieces according to the present application. 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 difference from the first embodiment of the device for replenishing lithium on pole pieces in FIG. 1 is that in the second embodiment, the substrate S1 is located between the adhesion layer S2 and one of the pressing rollers 11, and the adhesion layer S2 is located on the lithium film. C between the transfer film T and the substrate S1. In other words, the strip S of the second embodiment and the strip S of the first embodiment are reversed.
  • the gap G between the two pressing rollers 11 of the roller pressing mechanism 1 is increased, thereby reducing the lithium-coated lithium during the replenishment of the pole piece P0.
  • the pressure of the film C reduces the damage of the lithium supplement pole piece P1 after the lithium supplementation and the transfer film T of the lithium film C due to the large covering force, so as to ensure the quality of the lithium supplement pole piece P1.
  • the adhesion layer S2 is intermittently arranged in contact with the transfer film T, compared with the first embodiment, the transfer film T is less damaged by the friction of the tape S.
  • the strip S provided by the strip providing mechanism 4 can reduce the pressure of the lithium film C during the process of replenishing the pole piece P0, thereby reducing The lithium supplement pole piece P1 and the transfer film T of the lithium film C after the small lithium supplement are damaged.
  • the pole piece includes a current collector and an active material layer intermittently disposed on the surface of the current collector
  • the method for replenishing lithium on a pole piece includes: providing the electrode Sheet, lithium film and tape, so that the lithium film is located between the tape and the pole piece, the lithium film includes a transfer film and a lithium foil, the tape includes a base material and is intermittently arranged at the The adhesion layer on the substrate, the adhesion layer can correspond to the active material layer of the pole piece; and the tape, the lithium film and the pole piece are rolled so that the lithium foil in the lithium foil Adhere to the active material layer.
  • the method for replenishing lithium on the pole piece further includes recovering the transfer film.
  • the method for replenishing lithium on a pole piece before providing the lithium film, further includes adhering the lithium foil to the transfer film.
  • the adhering the lithium foil to the transfer film includes: providing a lithium tape, the transfer film, and an auxiliary film; rolling the lithium tape, the transfer film, and the auxiliary film
  • the lithium film is formed by rolling the lithium ribbon into the lithium foil and continuously adhering the lithium foil on the transfer film.
  • the adhering the lithium foil on the transfer film further includes recovering the auxiliary film.
  • the method for replenishing lithium on the pole piece further includes recovering the tape.
  • the substrate and/or the adhesion layer have elasticity.
  • the method for replenishing lithium on the pole piece further includes attaching the active material layer to the lithium film The pole piece is charged.
  • the lithium film, the transfer film, and the tape are correspondingly arranged in one group or two groups according to the active material layer being arranged on one or both surfaces of the current collector.
  • the strip lifting can reduce the pressure of the lithium film covering the pole piece during the process of replenishing lithium, thereby reducing the lithium replenishing pole piece and lithium The transfer membrane of the membrane is damaged.

Abstract

本申请提供一种用于极片补锂的装置及方法，极片包括集流体以及间断性地设置在集流体表面上的活性物质层，用于极片补锂的装置包括辊压机构、极片提供机构、锂膜提供机构、带材提供机构；辊压机构包括两个压辊；极片提供机构用于提供极片；锂膜提供机构用于提供锂膜，锂膜包括转移膜和锂箔，锂箔连续地粘附在转移膜上；带材提供机构用于提供带材，带材包括基材以及附着层，附着层能够与极片的活性物质层对应；辊压机构用于压延带材、锂膜以及极片，以使锂膜中的锂箔粘附到活性物质层上。本发明通过增加带材提供机构，能够减小极片补锂过程中覆合锂膜的压力，从而减小补锂后的补锂极片和锂膜的转移膜受损。

Description

用于极片补锂的装置及方法
本申请要求于2019年07月05日提交中国专利局、申请号为201910605942.5、申请名称为“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，特别是涉及一种用于极片补锂的装置及方法。
背景技术
近年来随着电动车的蓬勃发展，对动力电池的能量密度要求越来越严格，对于负极片来说，在电池的首次充电过程中都会由于固体电解质膜(SEI膜)的形成而消耗部分锂，继而造成正极材料锂的损失，从而降低了电池的容量，造成首次效率的降低。这在以合金材料(如硅合金和锡合金等)为活性物质的负极片中表现得尤为明显。为了减少由于电池在首次充放电过程中的不可逆容量带来的电池容量的降低，已采用一些解决方法。
其中一个解决方法采用了一种用于极片补锂的装置，在这种用于极片补锂的装置中，锂膜提供机构用于提供锂膜，锂膜包括转移膜和锂箔，锂箔连续地粘附在转移膜上且面向极片的活性物质层，极片包括集流体以及间断性地设置在集流体表面上的活性物质层。辊压机构用于将锂膜以及极片压延，锂膜中的锂箔间断性地粘附到活性物质层上。然而，在该用于极片补锂的装置中，锂膜很薄，极片压延时辊压机构的压辊之间的间隙也较小，从而容易造成极片在锂膜压延过程中受力变形。
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极片补锂的装置及方法，其能减小极片补锂过程中覆合锂膜的压力，从而减小补锂后的补锂极片和锂膜的转移膜受损。
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：在一方面，本申请提供了一种用于极片补锂的装置，所述极片包括集流体以及间断性地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、极片提供机构、锂膜提供机构；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；所述锂膜提供机构位于所述两个压辊的上游，所述锂膜提供机构用于提供锂膜，所述锂膜包括转移膜和锂箔；所述用于极片补锂的装置还包括带材提供机构；所述带材提供机构用于向所述锂膜的转移膜和与其对应一侧的压辊之间提供带材，所述带材包括基材以及间断设置在所述基材上的附着层，所述附着层能够与所述极片的活性物质层对应；所述辊压机构用于压延所述带材、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转移膜收取机构，所述转移膜收取机构位于所述两个压辊的下游，所述转移膜收取机构用于将通过所述两个压辊的转移膜收取。
在一实施例中，所述锂膜提供机构包括轧制机构，所述轧制机构用于使所述锂箔粘附在所述转移膜上。
在一实施例中，所述锂膜提供机构还包括辅助膜提供机构，所述辅助膜提供机构位于所述轧制机构的上游，所述辅助膜提供机构用于向所述轧制机构提供辅助膜。
在一实施例中，所述锂膜提供机构还包括辅助膜收取机构，所述辅助膜收取机构位于所述轧制机构的下游，所述辅助膜收取机构用于收取穿过所述轧制机构的辅助膜。
在一实施例中，所述轧制机构包括转移膜提供机构、锂带提供机构以及两个轧辊，所述转移膜提供机构用于向所述两个轧辊之间提供转移膜，所述锂带提供机构用于向所述两个轧辊之间提供锂带，所述两个轧辊用于轧制所述锂带以及所述转移膜，以将所述锂带轧制成所述锂箔并使所述锂箔连续性地粘附在所述转移膜上而形成所述锂膜。
在一实施例中，所述带材提供机构包括分别设置在所述两个压辊的上游和下游的带材放出机构以及带材收取机构，所述带材放出机构用于 向所述两个压辊放出所述带材，所述带材收取机构用于收取穿过所述两个压辊的带材。
在一实施例中，所述基材和/或所述附着层具有弹性。
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，所述锂膜提供机构、所述转移膜收取机构以及所述带材提供机构依据所述活性物质层设置在所述集流体一个或两个表面上而对应地设置为一组或两组。
本申请的有益效果如下；与背景技术相比，由于带材提供机构的设置，带材提供机构提供的带材能够减小极片补锂过程中覆合锂膜的压力，从而减小补锂后的补锂极片和锂膜的转移膜受损。
为了实现上述目的，在另一方面，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间断地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：提供所述极片、锂膜以及带材，使所述锂膜位于所述带材与所述极片之间，所述锂膜包括转移膜和锂箔，所述带材包括，基材以及间断设置在所述基材上的附着层，所述附着层能够与所述极片的活性物质层对应；压延所述带材、所述锂膜以及所述极片，以使所述锂箔中的锂箔粘附到所述活性物质层上。
在一些实施例中，在提供所述锂膜之前，所述用于极片补锂的方法还包括，使所述锂箔粘附在所述转移膜上。
在一些实施例中，所述使所述锂箔粘附在所述转移膜上包括：提供锂带、所述转移膜以及辅助膜；轧制所述锂带、所述转移膜以及所述辅助膜，以将所述锂带轧制成所述锂箔并使所述锂箔连续性地粘附在所述转移膜上而形成所述锂膜。
在一些实施例中，所述锂膜、所述转移膜以及所述带材依据所述活性物质层设置在所述集流体一个或两个表面上而对应地设置为一组或两组。
本申请的有益效果如下；与背景技术相比，由于提供带材，带材提带材能够减小极片补锂过程中覆合锂膜的压力，从而减小补锂后的补锂极片和锂膜的转移膜受损。
附图说明
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辊压机构的示意图。
图3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。
其中，附图标记说明如下：
1辊压机构                                 A辅助膜
11压辊                              33辅助膜收取机构
G间隙                               C锂膜
2极片提供机构                       L0锂带
P0极片                              L1锂箔
P01集流体                          4带材提供机构
P02活性物质层                       41带材放出机构
R空白集流体区                       42带材收取机构
3锂膜提供机构                           S带材
31轧制机构                             S1基材
311转移膜提供机构                    S2附着层
T转移膜                            5转移膜收取机构
312锂带提供机构                    P1补锂极片
313轧辊                            6补锂极片收取机构
32辅助膜提供机构
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。图2是根据本申请的用于极片补锂的装置的辊压机构的示意图。
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、锂膜提供机构3。依据实际情况，用于极片补锂的装置还可包括转移膜收取机构5。依据实际情况，用于极片补锂的装置还可包括补锂极片收取机构6。
极片P0包括集流体P01以及间断性地设置在集流体P01表面上的活性物质层P02。图1中，间断性的活性物质层P02之间为空白集流体区R，即集流体P01表面上的未设置活性物质层P02的部分。在图1中，集流体P01两个表面上的活性物质层P02相对集流体P01对称分布。当然，活性物质层P02可以设置在集流体P01的仅一个表面上。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将卷料形式的极片P0进行放卷。
辊压机构1包括两个压辊11。两个压辊11之间留有间隙G。
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。
锂膜提供机构3位于两个压辊11的上游。锂膜提供机构3用于提供锂膜C。锂膜C包括转移膜T和锂箔L1。锂箔L1粘附在转移膜T上且面向极片P0的活性物质层P02。在图1中，锂箔L1连续地粘附在转移膜T上。
在图1中，锂膜提供机构3包括轧制机构31。依据实际情况，锂膜提供机构3还可包括辅助膜提供机构32。依据实际情况，锂膜提供机构3还可包括辅助膜收取机构33。
轧制机构31用于使锂箔L1连粘附在转移膜T上。在图1中，轧制机构31用于使续性地锂箔L1连粘附在转移膜T上。在图1中，轧制机构31包括转移膜提供机构311、锂带提供机构312以及两个轧辊313。 转移膜提供机构311用于向两个轧辊313之间提供转移膜T。如图1所示，转移膜提供机构311为辊子，从而转移膜提供机构311用于将卷料形式的转移膜T进行放卷。锂带提供机构312用于向两个轧辊313之间提供锂带L0。如图1所示，锂带提供机构312为辊子，从而锂带提供机构312用于将卷料形式的锂带L0进行放卷。两个轧辊313用于轧制锂带L0以及转移膜T，以将锂带L0轧制成锂箔L1并使锂箔L1粘附在转移膜T上而形成锂膜C。换句话说，锂箔L1与转移膜T之间的粘接力大于锂箔L1与轧辊313(位于锂箔L1的与转移膜T相反的一侧)的粘接力。在图1中，两个轧辊313将锂带L0轧制成锂箔L1并使锂箔L1连续地粘附在转移膜T上。
辅助膜提供机构32位于轧制机构31的上游。辅助膜提供机构32用于向轧制机构31(具体为两个轧辊313之间)提供辅助膜A。换句话说，锂箔L1与转移膜T之间的粘接力大于锂箔L1与辅助膜A的粘接力，从而两个轧辊313将进入两个轧辊313之间的锂带L0、转移膜T以及辅助膜A轧制，以将锂带L0轧制成锂箔L1并使锂箔L1连续性地粘附在转移膜T上而形成锂膜C。如图1所示，辅助膜提供机构32为辊子，从而辅助膜提供机构32用于将卷料形式的辅助膜A进行放卷。
辅助膜收取机构33位于轧制机构31的下游。辅助膜收取机构33用于收取穿过轧制机构31(具体为两个轧辊313之间)的辅助膜A，以回收辅助膜A，同时为辅助膜A提供牵引力。注意的是，辅助膜提供机构32和辅助膜收取机构33可以省略，此时只需锂箔L1与转移膜T之间的粘接力大于锂箔L1与轧辊313(位于锂箔L1的与转移膜T相反的一侧)的粘接力即可实现锂箔L1连续性地粘附在转移膜T上而形成锂膜C。如图1所示，辅助膜收取机构33为辊子，从而辅助膜收取机构33用于将辅助膜A收卷。锂膜提供机构3不限于图1所示的示例，锂膜提供机构3提供的锂膜C可以采用成品的锂膜C，即离线已成形的锂膜C制品。
带材提供机构4用于向锂膜C的转移膜T和与其对应一侧的压辊11之间提供带材S。带材S包括基材S1以及间断设置在基材S1上的附着层S2，附着层S2能够与极片P0的活性物质层P02对应。基材S1位于附着层S2与锂膜C的转移膜T之间，附着层S2位于其中一个压辊11 和基材S1之间。基材S1的材料可以选择任何合适的公知的材料，只要具有即可。同样地，附着层S2的材料可以选择任何合适的公知的材料，只要具有即可。附着层S2可以通过涂布方式设置。
带材提供机构4包括分别设置两个压辊11的上游和下游的带材放出机构41以及带材收取机构42。带材放出机构41用于向两个压辊11放出带材S，如图1所示，带材放出机构41为辊子，从而带材放出机构41用于将卷料形式的带材S进行放卷。带材收取机构42用于收取穿过两个压辊的带材S，同时提供带材S的牵引力。如图1所示，带材收取机构42为辊子，从而带材收取机构42用于将带材S收卷。
其中，两个压辊11之间的间隙G尺寸小于附着层S2、基材S1、锂膜C、集流体P01以及活性物质层P02的厚度之和，且大于基材S1、锂膜C和集流体P01的厚度之和。辊压机构1将带材S、锂膜C以及极片P0在附着层S2与极片P0的活性物质层P02对应的状态下压延，锂膜C中的锂箔L1间断性地粘附到活性物质层P02上。而锂箔L1的除间断性地粘附到活性物质层P02上外的剩余部分间断性地保留在转移膜T。
转移膜收取机构5位于两个压辊11的下游。转移膜收取机构5用于将通过两个压辊11的转移膜T收取，同时提供锂膜C的牵引力。如图1所示，转移膜收取机构5为辊子，从而转移膜收取机构5将转移膜T收卷。
补锂极片收取机构6位于两个压辊11的下游。补锂极片收取机构6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，同时提供极片P0的牵引力。如图1所示，补锂极片收取机构6为辊子，从而补锂极片收取机构6用于将补锂极片P1收卷。
锂膜提供机构3、带材提供机构4以及转移膜收取机构5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。
在图1所示的第一实施例中，带材提供机构4提供的带材S将转移膜T与对应的压辊11间隔开，增加了辊压机构1的两个压辊11之间的间隙，从而减小极片P0补锂时的覆合锂膜C的压力，降低补锂后的补锂极片P1和锂膜的转移膜T因覆合力大而产生的损伤，保证补锂极片 P1的质量。在图1所示的第一实施例中，带材收取机构42、转移膜收取机构5、补锂极片收取机构6针对极片P0的单侧提供了三个牵引力，当已补锂极片P1的活性物质层P02离开间隙G而极片P0的空白集流体区R进入间隙G时，这些牵引力以及转移膜T对锂箔L1的粘接力附着在已补锂极片P1的活性物质层P02上的锂箔L1和转移膜T上的剩余锂箔L1断开，随着间断性的活性物质层P02的不断进入间隙G以及随后从间隙G出来，锂箔L1的除间断性地粘附到活性物质层P02上外的剩余部分间断性地保留在转移膜T。与背景技术的极片的单侧提供两个牵引力相比，能够使转移膜T上的锂箔L1的间断性地断开更顺畅更精确。
图3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。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，基材S1位于附着层S2与其中一个压辊11之间，附着层S2位于锂膜C的转移膜T和基材S1之间。换句话说，第二实施例的带材S与第一实施例的带材S互为颠倒。
在图3所示的第二实施例中，由于带材S的设置，增加了辊压机构1的两个压辊11之间的间隙G，从而减小极片P0补锂时的覆合锂膜C的压力，降低补锂后的补锂极片P1和锂膜C的转移膜T因覆合力大而产生的损伤，保证补锂极片P1的质量。进一步地，由于间断设置的附着层S2与转移膜T接触，与第一实施例相比，转移膜T受带材S的摩擦导致的损伤更小。
综上所述，与背景技术相比，由于带材提供机构4的设置，带材提供机构4提供的带材S能够减小极片P0补锂过程中覆合锂膜C的压力，从而减小补锂后的补锂极片P1和锂膜C的转移膜T受损。
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。
所述用于极片补锂的方法，所述极片包括集流体以及间断地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：提供 所述极片、锂膜以及带材，使所述锂膜位于所述带材与所述极片之间，所述锂膜包括转移膜和锂箔，所述带材包括，基材以及间断设置在所述基材上的附着层，所述附着层能够与所述极片的活性物质层对应；压延所述带材、所述锂膜以及所述极片，以使所述锂箔中的锂箔粘附到所述活性物质层上。
在一些实施例中，在压延所述带材、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，收取所述转移膜。
在一些实施例中，在提供所述锂膜之前，所述用于极片补锂的方法还包括，使所述锂箔粘附在所述转移膜上。
在一些实施例中，所述使所述锂箔粘附在所述转移膜上包括：提供锂带、所述转移膜以及辅助膜；轧制所述锂带、所述转移膜以及所述辅助膜，以将所述锂带轧制成所述锂箔并使所述锂箔连续性地粘附在所述转移膜上而形成所述锂膜。
在一些实施例中，在轧制所述锂带、所述转移膜以及所述辅助膜之后，所述使所述锂箔粘附在所述转移膜上还包括，收取所述辅助膜。
在一些实施例中，在压延所述带材、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，收取所述带材。
在一些实施例中，所述基材和/或所述附着层具有弹性。
在一些实施例中，在压延所述带材、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膜的极片收取。
在一些实施例中，所述锂膜、所述转移膜以及所述带材依据所述活性物质层设置在所述集流体一个或两个表面上而对应地设置为一组或两组。
综上所述，与背景技术相比，由于提供带材，带材提带材能够减小极片补锂过程中覆合锂膜的压力，从而减小补锂后的补锂极片和锂膜的转移膜受损。
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. 一种用于极片补锂的装置，所述极片(P0)包括集流体(P01)以及间断性地设置在所述集流体(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)、极片提供机构(2)、锂膜提供机构(3)；
    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)；
    所述锂膜提供机构(3)位于所述两个压辊(11)的上游，所述锂膜提供机构(3)用于提供锂膜(C)，所述锂膜(C)包括转移膜(T)和锂箔(L1)；
    其特征在于，
    所述用于极片补锂的装置还包括带材提供机构(4)；
    所述带材提供机构(4)用于向所述转移膜(T)和与其对应一侧的压辊(11)之间提供带材(S)，所述带材(S)包括基材(S1)以及间断设置在所述基材(S1)上的附着层(S2)，所述附着层(S2)能够与所述极片(P0)的活性物质层(P02)对应；
    所述辊压机构(1)用于压延所述带材(S)、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。
  2. 根据权利要求1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转移膜收取机构(5)，
    所述转移膜收取机构(5)位于所述两个压辊(11)的下游，所述转移膜收取机构(5)用于将通过所述两个压辊(11)的转移膜(T)收取。
  3. 根据权利要求1或2所述的用于极片补锂的装置，其特征在于，
    所述锂膜提供机构(3)包括轧制机构(31)，所述轧制机构(31) 用于使所述锂箔(L1)粘附在所述转移膜(T)上。
  4. 根据权利要求1-3中任意一项所述的用于极片补锂的装置，其特征在于，所述锂膜提供机构(3)还包括辅助膜提供机构(32)，所述辅助膜提供机构(32)位于所述轧制机构(31)的上游，所述辅助膜提供机构(32)用于向所述轧制机构(31)提供辅助膜(A)。
  5. 根据权利要求1-4中任意一项所述的用于极片补锂的装置，其特征在于，所述锂膜提供机构(3)还包括辅助膜收取机构(33)，所述辅助膜收取机构(33)位于所述轧制机构(31)的下游，所述辅助膜收取机构(33)用于收取穿过所述轧制机构(31)的辅助膜(A)。
  6. 根据权利要求3-5中任意一项所述的用于极片补锂的装置，其特征在于，所述轧制机构(31)包括转移膜提供机构(311)、锂带提供机构(312)以及两个轧辊(313)，
    所述转移膜提供机构(311)用于向所述两个轧辊(313)之间提供转移膜(T)，
    所述锂带提供机构(312)用于向所述两个轧辊(313)之间提供锂带(L0)，
    所述两个轧辊(313)用于轧制所述锂带(L0)以及所述转移膜(T)，以将所述锂带(L0)轧制成所述锂箔(L1)并使所述锂箔(L1)粘附在所述转移膜(T)上而形成所述锂膜(C)。
  7. 根据权利要求1-6中任意一项所述的用于极片补锂的装置，其特征在于，
    所述带材提供机构(4)包括分别设置于所述两个压辊(11)的上游和下游的带材放出机构(41)以及带材收取机构(42)，所述带材放出机构(41)用于向所述两个压辊(11)放出所述带材(S)，所述带材收取机构(42)用于收取穿过所述两个压辊的带材(S)。
  8. 根据权利要求1-7中任意一项所述的用于极片补锂的装置，其特征在于，所述基材(S1)和/或所述附着层(S2)具有弹性。
  9. 根据权利要求1-8中任意一项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(6)，
    所述补锂极片收取机构(6)位于所述两个压辊(11)的下游，所述补锂极片收取机构(6)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。
  10. 根据权利要求2所述的用于极片补锂的装置，其特征在于，所述锂膜提供机构(3)、所述转移膜收取机构(5)以及所述带材提供机构(4)依据所述活性物质层(P02)设置在所述集流体(P01)一个或两个表面上而对应地设置为一组或两组。
  11. 一种用于极片补锂的方法，所述极片包括集流体以及间断地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：
    提供所述极片、锂膜以及带材，使所述锂膜位于所述带材与所述极片之间，所述锂膜包括转移膜和锂箔，所述带材包括，基材以及间断设置在所述基材上的附着层，所述附着层能够与所述极片的活性物质层对应；
    压延所述带材、所述锂膜以及所述极片，以使所述锂箔中的锂箔粘附到所述活性物质层上。
  12. 根据权利要求11所述的用于极片补锂的方法，其特征在于，在提供所述锂膜之前，所述用于极片补锂的方法还包括，使所述锂箔粘附在所述转移膜上。
  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，所 述使所述锂箔粘附在所述转移膜上包括：
    提供锂带、所述转移膜以及辅助膜；
    轧制所述锂带、所述转移膜以及所述辅助膜，以将所述锂带轧制成所述锂箔并使所述锂箔连续性地粘附在所述转移膜上而形成所述锂膜。
  14. 根据权利要求11-13中任意一项所述的用于极片补锂的方法，其特征在于，所述锂膜、所述转移膜以及所述带材依据所述活性物质层设置在所述集流体一个或两个表面上而对应地设置为一组或两组。
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