WO2018097606A1 - 전극조립체 제조 장치 및 그 전극조립체 제조 장치에 의한 전극조립체 제조 방법 - Google Patents

전극조립체 제조 장치 및 그 전극조립체 제조 장치에 의한 전극조립체 제조 방법 Download PDF

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Publication number
WO2018097606A1
WO2018097606A1 PCT/KR2017/013375 KR2017013375W WO2018097606A1 WO 2018097606 A1 WO2018097606 A1 WO 2018097606A1 KR 2017013375 W KR2017013375 W KR 2017013375W WO 2018097606 A1 WO2018097606 A1 WO 2018097606A1
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WO
WIPO (PCT)
Prior art keywords
electrode
bonding
electrode assembly
separator
assembly manufacturing
Prior art date
Application number
PCT/KR2017/013375
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English (en)
French (fr)
Korean (ko)
Inventor
이민재
이주성
Original Assignee
주식회사 엘지화학
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Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201790000544.5U priority Critical patent/CN208539012U/zh
Publication of WO2018097606A1 publication Critical patent/WO2018097606A1/ko

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0468—Compression means for stacks of electrodes and separators
    • 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
    • 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
    • H01M10/058—Construction or 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode assembly manufacturing apparatus and an electrode assembly manufacturing method using the electrode assembly manufacturing apparatus, and more particularly, an electrode assembly manufacturing apparatus and an electrode assembly manufacturing apparatus capable of preventing a short inside the secondary battery due to an external impact. It relates to a method for producing an electrode assembly by.
  • the secondary battery has a structure in which an electrode assembly having a separator interposed between a positive electrode and a negative electrode is stacked or wound and sealed in a case in which an electrolyte is impregnated.
  • the electrode assembly of the secondary battery has a jelly-roll type wound in a state of interposing the electrode assembly and a plurality of positive and negative electrodes coated with electrode active materials on both sides of a current collector foil having a predetermined unit size through a separator. Ecologically divided into stack-type (stack-type) sequentially stacked.
  • the jelly-roll type electrode assembly is coated with an electrode active material or the like on a metal foil used as a current collector, dried and pressed, cut into bands of a desired width and length, and the membrane is separated by using a separator to form a spiral. It is manufactured by winding.
  • Such a jelly-roll type electrode assembly may be preferably used in a cylindrical battery, but in application to a square or pouch type battery, the stress is locally concentrated and the electrode active material is peeled off or the battery shrinks due to shrinkage and expansion phenomenon repeated during charge and discharge. There is a problem that causes deformation.
  • the stacked electrode assembly is a structure in which a plurality of anode and cathode unit cells are sequentially stacked, and it is easy to obtain a rectangular shape, but when the manufacturing process is complicated and an impact is applied, the electrode is pushed to cause a short circuit. There are disadvantages.
  • the electrode assembly of the advanced structure of the jelly-roll type and the stacked form, a full cell or anode (cathode) / separator / cathode of a certain unit size of the anode / separator / cathode structure A stack-and-foldable electrode assembly was developed in which a bicell of (anode) / separator / anode (cathode) structure was folded using a continuous separation film of a long length, which is a conventional Korean patent application publication. 2001-82058.
  • the conventional bicell type electrode assembly has a problem that damage to the electrode may occur when the separator is not bonded unless the gap between the cathode electrode and the separator is maintained at a constant interval.
  • the present invention has been made to solve the above problems, the object of the present invention is to prevent the short inside the secondary battery due to external shock and to improve the stability of the secondary battery manufacturing apparatus and the electrode assembly manufacturing It is to provide a method for producing an electrode assembly by the device.
  • Electrode assembly manufacturing apparatus is to be laminated in the order of the first electrode, the separator, the transfer unit for unwinding and transferring the second electrode, the first electrode, the separator, the second electrode, the separator, the first electrode It characterized in that it comprises a laminate for stacking the first electrode, the separator, the second electrode received from the transfer unit to form an electrode laminated body and a bonding portion for bonding the ends of at least two neighboring membrane neighboring in the electrode laminate do.
  • the bonding part is a roller that rotates and presses the separator, and the roller may rotate in a direction opposite to the advancing direction of the electrode laminate.
  • the surface of the roller may be embossed or engraved.
  • the bonding part may include a heating wire that generates heat, and heat-compresses end portions of the plurality of separation membranes.
  • the bonding part may be formed of a pair of rollers, and end portions of the plurality of separation membranes may be bonded in a direction facing each other between the pair of rollers.
  • the second electrode may be formed between a plurality of separators, and the second electrode may be fixed by a plurality of separators whose ends are bonded to each other by the bonding part.
  • a plurality of the separators are larger than the first electrode and the second electrode, and an end portion of the plurality of separators protrudes from the side of the electrode laminate, and an end portion of the bonding portion protrudes from the side of the electrode laminate. It may be located to correspond to the ends of the plurality of separation membrane.
  • the joining portion is formed of a pair of press plates that are pressed in an opposite direction, and end portions of the plurality of separators are joined in a direction facing each other by the pair of press plates when positioned between the pair of press plates. Can be.
  • the pair of press plates may be embossed or indented on the surface.
  • Electrode assembly manufacturing method using an electrode assembly manufacturing apparatus is a transfer step of unwinding and transporting the first electrode, the separator, the second electrode, the first electrode, the separator, the second electrode, the separator, the first Laminating step of laminating the first electrode, the separator, and the second electrode transferred in the transfer step so as to be stacked in the order of the electrodes; and bonding the ends of at least two neighboring separators adjacent to each other after the electrode step. It is characterized by.
  • the ends of at least two neighboring separators may be heat-compressed with each other.
  • a pair of rollers or a pair of press plates may be bonded to each other in the direction in which the ends of at least two neighboring separators face each other.
  • the ends of at least two neighboring separators may be bonded to each other to fix a second electrode located between the separators.
  • 1 is a configuration diagram schematically showing the electrode assembly manufacturing apparatus of the present invention from the side.
  • Figure 2 is a plan view showing a partially enlarged planar view of the electrode laminated body is transferred toward the bonding portion according to an embodiment of the present invention.
  • FIG 3 is a partially enlarged view illustrating a state in which end portions of the separation membrane are bonded by the bonding portion according to an embodiment of the present invention.
  • Figure 4 is a side view schematically showing the bonding portion according to another embodiment of the present invention.
  • FIG. 5 is a side view schematically showing the cemented portion according to another embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method of manufacturing an electrode assembly by the electrode assembly manufacturing apparatus of the present invention.
  • 1 is a configuration diagram schematically showing the electrode assembly manufacturing apparatus of the present invention from the side.
  • the electrode assembly manufacturing apparatus As shown in Figure 1, the electrode assembly manufacturing apparatus according to an embodiment of the present invention, the transfer unit (1), the first electrode 10, the separation membrane 20, the second electrode 30 unwinding and conveying The first electrode 10 and the separator 20 received from the transfer unit so as to be stacked in the order of the first electrode 10, the separator 20, the second electrode 30, the separator 20, and the first electrode 10.
  • the stacking unit 3 stacking the second electrode 30 to form the electrode stack 100 and the end portions 21 of the at least two separation membranes 20 adjacent to each other in the electrode stack 100 are connected to each other. And a fitting part 5 to be bonded.
  • the transfer unit 1 unwinds the first electrode 10, the separator 20, and the second electrode 30 from each of the wound first electrode 10, the separator 20, and the second electrode 30, and bonds them together. It is for conveying in the direction of the part 5.
  • the transfer unit 1 may be formed of any one or more of a transfer roller or a conveyor belt.
  • the stacking unit 3 is for stacking the first electrode 10, the separator 20, and the second electrode 30 transferred by the transfer unit 1.
  • the stacking unit 3 may stack the first electrode 10 and the second electrode 30 so as to be separated by the separator 20.
  • the first electrode 10 and the separator 20 may be stacked.
  • the second electrode 30, the separator 20, and the first electrode 10 are stacked in this order to describe a bicell shape in which the same electrode is positioned on both outermost sides, but is not limited thereto.
  • the electrode stacked structure 100 has a shape or the first electrode 10 and the second electrode 30 if the first electrode 10 and the second electrode 30 are stacked to be separated by the separator 20.
  • the number of stacked layers of the separator 20 may not be limited.
  • the stacking unit 3 may be stacked using any one or more of heat or pressure to stack the electrode stacks 100.
  • the first electrode 10 and the second electrode 30 forming the electrode stacked structure 100 may be any one of a positive electrode to which a positive electrode active material is applied and a negative electrode to which a negative electrode active material is applied to form an upper electrode.
  • the second electrode 30 when the first electrode 10 forms an anode, when the second electrode 30 forms a cathode, and when the first electrode 10 forms an anode, the second electrode 30 may form an anode. .
  • the positive electrode generally be panil aluminum, and the positive electrode active material may be a lithium-containing chalcogenides or lithium transition metal oxide compound such as a knife LiCoO 2, LiNiO 2, LiMnO 2 , LiMnO 4.
  • the negative electrode may generally be a copper plate, and the negative electrode active material may be crystalline carbon, amorphous carbon, carbon composite, carbon material such as carbon fiber, lithium metal or lithium alloy, or the like.
  • the separator 20 is, for example, any selected from the group consisting of polyethylene (PE), polystyrene (PS), polypropylene (PP) and a copolymer of polyethylene (PE) and polypropylene (PP). It can be prepared by coating a polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP co-polymer) on one substrate.
  • PE polyethylene
  • PS polystyrene
  • PP polypropylene
  • PP copolymer of polyethylene
  • PP polypropylene
  • PVDF-HFP co-polymer polyvinylidene fluoride-hexafluoropropylene copolymer
  • the electrode stack 100 forms the first electrode 10, the separator 20, the second electrode 30, the separator 20, and the first electrode 10, the pair of separators 20 One of the positive electrode and the negative electrode may be located.
  • the stacking unit 3 may be formed at the outlet side for discharging the electrodes 10 and 20 and the separator 20 from the transfer unit 1.
  • the stacking unit 3 according to the present invention has an advantage in that it can be implemented by installing at the end of the process of transporting the electrode assembly in the conventional electrode assembly manufacturing process, it is easy to implement.
  • FIG. 2 is a schematic view showing, in part, an enlarged plan view of the electrode stacked body being transferred toward the cemented portion 5 according to an embodiment of the present invention.
  • the separator 20 is larger than the first electrode 10 and the second electrode 30 to prevent a short circuit between the first electrode 10 and the second electrode 30. It can be formed large.
  • the end portion 21 of the separator 20 in the electrode laminate 100 may be formed to protrude toward the side of the electrode laminate 100.
  • the bonding part 5 may be disposed at a position corresponding to the end 21 of the separator 20 in the electrode stack 100 to be transferred.
  • Figure 3 is a state diagram showing the use of the side portion of the enlarged part of the separation membrane is bonded to the bonding portion according to an embodiment of the present invention.
  • the electrode assembly manufacturing apparatus rotates in a direction (d1) and a reverse direction (d2) in which the bonding portion 5 transfers the electrode laminate 100 and the separation membrane ( It is possible to form a pair of rollers for pressing the end portion 21 of 20).
  • the pair of rollers forming the bonding portion 5 may be bonded in a direction facing each other end 21 of the plurality of separation membrane (20).
  • the pair of rollers forming the cemented portion 5 may have a built-in heating wire to heat and compress the end portions 21 of the plurality of separators 20 in a direction facing each other, thereby increasing the cemented effect.
  • the second electrodes 30 stacked between the plurality of separators 20 are fixed between the separators 20 so that the secondary battery may receive an external shock such as a drop. Even if it receives, the 1st electrode 10 and the 2nd electrode 30 can be prevented from short-circuiting.
  • the second electrode 30 is fixed by the separator 20 stacked on both sides, the first electrode 10 and the second electrode 30 are not shorted to each other, thereby improving stability of the secondary battery. .
  • Figure 4 is a side view schematically showing the bonding portion according to another embodiment of the present invention.
  • the cemented portion 5a may be embossed or indented on the surface of the roller.
  • the bonding force of the ends 21 of the plurality of separation membranes 20 compressed between the pair of rollers may be increased.
  • the embossed or intaglio formed on the pair of rollers are formed to cross between the pair of rollers facing each other can increase the bonding rate of the end 21 of the plurality of separation membrane 20.
  • FIG. 5 is a side view schematically showing the cemented portion according to another embodiment of the present invention.
  • the cemented portion (5b) may be formed as a pair of press plate pressed in the opposite direction.
  • the end 21 of the plurality of separation membranes 20 is compressed between the pair of press plates that reciprocate (d3) in a direction facing each other.
  • the ends 21 of the two separation membranes 20 may be bonded to each other.
  • the pair of press plates may have a built-in heating wire and may compress the ends 21 of the plurality of separation membranes 20 while heating.
  • the pair of press plates are indented or embossed in a direction facing each other to compress the end 21 of the plurality of separation membranes 20 to each other, the bonding force of the end 21 of the plurality of separation membranes 20 are bonded together Can increase.
  • the pair of press plates may further improve the bonding force of the end portions 21 of the plurality of separation membranes 20 formed by bonding the intaglio or embossed portions formed in a direction facing each other.
  • FIG. 6 is a flowchart illustrating a method of manufacturing an electrode assembly by the electrode assembly manufacturing apparatus of the present invention.
  • the electrode assembly manufacturing method by the electrode assembly manufacturing apparatus of the present invention includes a transfer step (S1), lamination step (S2) and bonding step (S3).
  • the transfer step S1 is a step of unwinding the first electrode 10, the separator 20, and the second electrode 30 wound as shown in FIG. 1, and transferring the wound first electrode 10, the separator 20, and the second electrode 30.
  • the first electrode 10, the separator 20, and the second electrode 30 to be transferred are stacked such that the first electrode 10 and the second electrode 30 are separated by the separator 20.
  • the electrode laminate 100 To form the electrode laminate 100.
  • the stacking step (S2) is such that the electrode stack 100 is stacked in the order of the first electrode 10, the separator 20, the second electrode 30, the separator 20, and the first electrode 10. can do.
  • the bonding step S3 is a step of bonding the end portions 21 of at least two neighboring separators 20 adjacent to each other after the stacking step S2.
  • the bonding step (S3) is a pair of rollers or a pair of presses to secure the second electrode 30 located between the separation membrane 20 by bonding the end 21 of the at least two separation membranes 20 adjacent to each other.
  • a plate may be used to bond the end portions 21 of at least two neighboring membranes 20 to each other by heat compression.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Cell Separators (AREA)
  • Battery Electrode And Active Subsutance (AREA)
PCT/KR2017/013375 2016-11-23 2017-11-22 전극조립체 제조 장치 및 그 전극조립체 제조 장치에 의한 전극조립체 제조 방법 WO2018097606A1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201790000544.5U CN208539012U (zh) 2016-11-23 2017-11-22 用于制造电极组件的设备

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KR10-2016-0156195 2016-11-23
KR1020160156195A KR102080256B1 (ko) 2016-11-23 2016-11-23 전극조립체 제조 장치 및 그 전극조립체 제조 장치에 의한 전극조립체 제조 방법

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Cited By (1)

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CN113224368A (zh) * 2021-05-06 2021-08-06 上海兰钧新能源科技有限公司 一种贴膜机及极片压合方法

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US20220246991A1 (en) * 2019-05-13 2022-08-04 Lg Energy Solution, Ltd. Method for manufacturing electrode assembly, electrode assembly manufactured therethrough, and secondary battery
KR102259747B1 (ko) * 2019-05-14 2021-06-02 주식회사 엘지에너지솔루션 전극조립체 및 그 제조방법
KR20200131614A (ko) * 2019-05-14 2020-11-24 주식회사 엘지화학 전극 조립체 제조장치와, 이를 통해 제조된 전극 조립체 및 이차전지
CN115917811A (zh) * 2020-07-17 2023-04-04 株式会社Lg新能源 隔膜密封装置和使用该隔膜密封装置制造单元电池的设备
JP7273777B2 (ja) * 2020-11-18 2023-05-15 プライムプラネットエナジー＆ソリューションズ株式会社 電極外装体の製造方法
KR20220109202A (ko) 2021-01-28 2022-08-04 주식회사 엘지에너지솔루션 분리막 접착장치
KR20240038459A (ko) 2022-09-16 2024-03-25 주식회사 엘지에너지솔루션 단위 셀의 라미네이션 방법, 그리고 이를 위한 장치

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