WO2018084606A1 - Electrode assembly and method for manufacturing same - Google Patents

Electrode assembly and method for manufacturing same Download PDF

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Publication number
WO2018084606A1
WO2018084606A1 PCT/KR2017/012340 KR2017012340W WO2018084606A1 WO 2018084606 A1 WO2018084606 A1 WO 2018084606A1 KR 2017012340 W KR2017012340 W KR 2017012340W WO 2018084606 A1 WO2018084606 A1 WO 2018084606A1
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WO
WIPO (PCT)
Prior art keywords
electrode
tabs
negative electrode
tab
positive
Prior art date
Application number
PCT/KR2017/012340
Other languages
French (fr)
Korean (ko)
Inventor
김수현
김지현
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201780007078.8A priority Critical patent/CN108496269B/en
Priority to EP17867461.0A priority patent/EP3514876B1/en
Priority to US16/067,449 priority patent/US10700384B2/en
Priority to EP24157680.0A priority patent/EP4346003A2/en
Priority claimed from KR1020170145158A external-priority patent/KR102103900B1/en
Publication of WO2018084606A1 publication Critical patent/WO2018084606A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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 and a method of manufacturing the electrode assembly, and more particularly, to an electrode assembly and a method of manufacturing the electrode assembly capable of aligning the tabs of the electrode assembly having a multi-tab.
  • Lithium secondary batteries may be divided into lithium metal batteries, lithium ion batteries, and lithium secondary batteries according to electrolyte types.
  • Lithium secondary battery does not need to use a solid metal enclosure, can be manufactured in various sizes and shapes according to the use, can be manufactured to a thickness of less than 3mm, can reduce the weight by more than 30%, mass production and large batteries Manufacturing is possible.
  • lithium secondary batteries are currently commercialized and used in various fields.
  • Korean Patent No. 10-1136156 discloses a conventional secondary battery and a method of manufacturing the secondary battery.
  • the electrode assembly is manufactured by attaching terminals (or electrode tabs) to the uncoated portions of the wound cathode and anode plates after winding the cathode plate, anode plate, and separator.
  • an object of the present invention is to provide an electrode assembly and a method of manufacturing the electrode assembly that can align the electrode tab stably.
  • Method of manufacturing an electrode assembly according to the present invention is a laminating step of forming an electrode laminate by repeatedly stacking a cathode, a separator, and a cathode so that a separator is laminated between a cathode having an electrode tab and an anode having an electrode tab, the electrode And an electrode tab coupling step of coupling at least two or more of the electrode tabs of the laminate to electrode tabs of the same pole and a winding step of winding the electrode laminate.
  • the electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode.
  • the negative electrode, the separator, and the positive electrode are stacked in plural numbers, and the negative electrode tabs formed on the plurality of negative electrode are connected to each other.
  • the positive electrode tabs stacked on each other and the positive electrode tabs formed on the plurality of positive electrodes may be stacked on each other.
  • the positive electrode tabs may be coupled to the positive electrode tabs, and the negative electrode tabs may be coupled to each other.
  • the electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode.
  • the negative electrode, the separator, and the positive electrode are stacked in plural numbers, and the negative electrode tabs formed on the plurality of negative electrode are connected to each other.
  • the positive electrode tabs stacked on each other and the positive electrode tabs formed on the plurality of positive electrodes may be stacked on each other.
  • the positive electrode tabs may be coupled to the positive electrode tabs, and the negative electrode tabs may not be coupled to each other.
  • the negative electrode tabs respectively formed on the plurality of negative electrodes may be bent in the direction of the center of the electrode laminate to stack the ends.
  • End portions of the stacked negative electrode tabs may be coupled to each other in a central axis direction of the electrode stack.
  • the stacking step, the electrode tab coupling step, and the winding step may be sequentially performed.
  • the electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode.
  • the negative electrode, the separator, and the positive electrode are stacked in plural numbers, and the positive electrode tabs of the plurality of positive electrodes are on the same vertical line.
  • the negative electrode tabs of the plurality of negative electrodes may be formed closer to the distance from the positive electrode tab toward the stacking direction of the negative electrode.
  • the positive electrode tabs formed on the plurality of positive electrodes are stacked on each other, and the positive electrode tabs are coupled to each other in the electrode tab coupling step, but the positive electrode tabs are coupled to each other, and the negative electrode tabs may not be coupled to each other. have.
  • Positions of the plurality of negative electrode tabs spaced apart from each other may be positions to overlap each other on the same vertical line after being wound in the winding step.
  • the electrode stacked body may be wound so that the negative electrode tab having a short distance from the positive electrode tab is formed inside the winding direction of the electrode stacked body.
  • a plurality of the negative electrode tab may be stacked so as to overlap on the same vertical line.
  • the negative electrode tabs respectively formed on the plurality of negative electrodes may be stacked and combined with each other.
  • End portions of the negative electrode tabs stacked and bonded may be bent in a center direction of the wound electrode laminate.
  • Positions of the plurality of negative electrode tabs spaced apart from each other are positions that are equally spaced about a central axis of the electrode stacked body wound in the winding step (S3), and in the winding step (S3),
  • the negative electrode tabs respectively formed on the negative electrode are disposed at equal intervals around the middle axis of the wound electrode laminate, and after the winding step S3, the negative electrode tab is bent toward the center of the wound electrode laminate. End portions of the bent negative electrode tabs may be stacked and bonded to each other.
  • An electrode assembly according to the present invention is an electrode assembly having a cathode, a separator, an electrode assembly repeatedly stacked by laminating an electrode, an electrode having at least one electrode of the electrode tabs of the negative electrode and the electrode tabs of the positive electrode stacked on the electrode assembly It characterized in that it comprises a bundle of electrode tabs coupled to each other.
  • the electrode tabs are stacked in combination with the negative electrode tabs formed on the plurality of negative electrodes stacked on the electrode assembly, and the positive electrode tabs formed on the positive electrode tabs formed on the plurality of positive electrodes stacked on the electrode assembly are stacked together. It can be any one or more of the bundles.
  • the electrode tab bundle may be formed by bending negative electrode tabs formed on the plurality of negative electrodes stacked on the electrode assembly toward the center of the electrode assembly and bonding the negative electrode tabs formed on the plurality of positive electrodes stacked on the electrode assembly. It may include a stack of positively coupled positive electrode tabs.
  • the negative electrode tabs formed on the plurality of negative electrodes may be spaced at equal intervals from each other in a state in which the electrode assembly is wound.
  • Electrode tabs of the plurality of positive electrodes stacked on the electrode assembly are positioned on the same vertical line, and electrode tabs of the negative electrode stacked on the electrode assembly are spaced apart from electrode tabs of the positive electrode according to a stacking direction of the plurality of negative electrodes.
  • the electrode tab of the cathode may be bent to overlap each other at the center of the electrode assembly.
  • a plurality of positive electrode tabs stacked on the same vertical line may include a positive electrode tab bundle.
  • the electrode tabs are aligned and coupled before winding the cathode, the anode, and the separator, there is an effect of maintaining the electrode tabs neatly aligned even after winding and assembling the electrode assembly.
  • the kinetic balance can be kept constant by making the movement route of the electrons constant, thereby improving the cycle characteristics.
  • FIG. 1 is a flowchart illustrating a method of manufacturing an electrode assembly according to Embodiment 1 of the present invention.
  • FIG. 2 is an exploded perspective view illustrating an electrode assembly according to Embodiment 1 of the present invention.
  • FIG. 3 is a perspective view illustrating the lamination of FIG. 2.
  • FIG. 4 is a plan view illustrating a positive electrode tab bundle according to a first embodiment of the present invention.
  • FIG. 5 is a bottom view illustrating a negative electrode tab bundle according to Embodiment 1 of the present invention.
  • FIG. 7 is an exploded perspective view illustrating the electrode assembly according to the third embodiment of the present invention.
  • FIG. 8 is a perspective view illustrating a state in which the electrode assemblies of FIG. 7 are stacked.
  • FIG. 9 is a front view illustrating the electrode assembly of FIG. 8 wound up.
  • FIG. 10 is a front view showing a state in which the electrode assembly according to the fourth embodiment of the present invention is wound.
  • FIG. 11 is a bottom view of FIG. 10.
  • FIG. 12 is a bottom view showing the bottom of a wound electrode assembly according to a fifth embodiment of the present invention.
  • FIG. 13 is a perspective view illustrating a secondary battery in which an electrode assembly is accommodated according to various embodiments of the present disclosure.
  • FIG. 1 is a flowchart illustrating a method of manufacturing an electrode assembly according to Embodiment 1 of the present invention.
  • the electrode assembly manufacturing method according to Embodiment 1 of the present invention includes a laminating step S1, an electrode tab coupling step S2, and a winding step S3.
  • FIG. 2 is an exploded perspective view illustrating an exploded view of an electrode assembly according to a first exemplary embodiment of the present invention
  • FIG. 3 is a perspective view illustrating a stacked example of FIG. 2.
  • the stacking step S1 may include a separator 130 between a cathode 110 having electrode tabs and an anode 150 having electrode tabs.
  • the plurality of cathodes 110, the separator 130, and the anode 150 are repeatedly stacked to form the electrode stacked structure 101.
  • the positive electrode 150 may be an aluminum plate, and may include a positive electrode active material portion coated with a positive electrode active material and a positive electrode non-coated portion not coated with the positive electrode active material.
  • the positive electrode active material may be a lithium-containing transition metal oxide such as LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMnO 4 , or a lithium chalcogenide compound.
  • the positive electrode active material may be formed by applying a positive electrode active material to a portion of at least one surface of the aluminum plate, and the remaining portion of the aluminum plate not coated with the positive electrode active material may be a positive electrode non-coating portion.
  • the positive electrode tab 151 is electrically connected to the positive electrode uncoated portion.
  • the negative electrode 110 may be a copper plate, and may include a negative electrode active material portion coated with a negative electrode active material and a negative electrode non-coated portion not coated with the negative electrode active material.
  • the negative electrode active material may be crystalline carbon, amorphous carbon, carbon composite, carbon material such as carbon fiber, lithium metal, lithium alloy, or the like.
  • the negative electrode active material may be formed by applying a negative electrode active material to a portion of at least one side of the copper plate, and the remaining portion of the copper plate not coated with the negative electrode active material may be a negative electrode non-coating portion.
  • the negative electrode tab 111 is electrically connected to the negative electrode uncoated portion.
  • the separator 130 is, for example, 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 negative electrode tabs 111 formed on the plurality of negative electrodes 110 may be stacked on the negative electrode tabs 111, and the positive electrode tabs 151 formed on the plurality of positive electrodes 150 may be stacked on each other.
  • the electrode tab coupling step S2 is a step of coupling at least one electrode tab of the same pole among the electrode tabs connected to each electrode stacked on the electrode stack 101.
  • the positive electrode tabs 151 electrically connected to the positive electrodes 150 of the electrodes stacked on the electrode stacked body 101 are coupled to each other, or electrically connected to the respective negative electrodes 110 among the electrodes stacked on the electrode stacked body 101.
  • the negative electrode tabs 111 connected to each other are coupled to each other.
  • the positive electrode tabs 151 electrically connected to the positive electrode 150 of the electrodes stacked on the electrode stack 101 in the electrode tab coupling step S2 are coupled to the positive electrode tabs 151 and the negative electrode 110.
  • the negative electrode tabs 111 electrically connected to the negative electrode tabs 111 may be coupled to the negative electrode tabs 111.
  • negative electrode tabs 111 and the positive electrode tabs 151 may be coupled to each other by welding or the like.
  • FIG 4 is a plan view showing a positive electrode tab bundle according to a first embodiment of the present invention
  • Figure 5 is a bottom view showing a negative electrode tab bundle according to a first embodiment of the present invention.
  • the winding step (S3) according to the first embodiment of the present invention by winding the electrode laminated body 101, the electrode tabs of at least one of the same poles bonded to each other, the electrode of the jelly roll type It is a step of forming the aggregate 100.
  • the positive electrode tab 151 is located in the winding center direction of the electrode assembly 100 as compared to the negative electrode tab 111, the positive electrode tabs 151 are combined with each other in the electrode tab coupling step S2, and then the winding step S3.
  • the electrode tabs of the electrode assembly 100 may be aligned neatly while facilitating the manufacture of the electrode assembly.
  • both the positive electrode tab 151 and the negative electrode tab 111 combine the positive electrode tab 151 with the positive electrode tab 151 and the negative electrode tab 111 with the negative electrode tab in step S2.
  • the positive electrode tab 151 and the negative electrode tab 111 may be aligned neatly.
  • FIG. 6 is a bottom view illustrating a negative electrode tab bundle according to a second embodiment of the present invention.
  • the stacking step S1 stacks a plurality of cathodes, separators, and anodes, respectively, and the cathode tabs 111 formed on the cathodes are negative electrode tabs 111.
  • the positive electrode tabs 151 stacked on each other and the positive electrode tabs 151 formed on the plurality of positive electrodes may be stacked on each other.
  • the stacked positive electrode tabs 151 may be coupled to each other by welding, and the stacked negative electrode tabs 111 may not be coupled to each other.
  • the positive electrode tabs 151 may be bonded to each other by welding or the like, and the negative electrode tabs 111 may be wound up on the electrode stack 101 without being bonded to each other.
  • the plurality of negative electrode tabs 111 of the electrode assembly 100 formed by winding the electrode laminate 101 may be bent in the direction of the center of the electrode assembly 100, thereby forming the plurality of negative electrode tabs 111.
  • the ends 1111 of can be stacked on each other. End portions 1111 of the negative electrode tabs 111 stacked on each other may be coupled to each other by welding or the like in the direction of the center axis of the electrode assembly 100.
  • the electrode tabs may be welded to each other by bonding the positive electrode tabs 151 and the negative electrode tabs 111 are not bonded to each other through the winding step (S3).
  • the electrode assembly 100 may be formed by winding the stack 101, and the negative electrode tabs 111 may be one of methods in which the negative electrode tabs 111 are coupled to each other after forming the electrode assembly 100.
  • the negative electrode tabs 111 positioned outside the winding direction of the electrode assembly 100 are coupled to each other after the winding step S3 to form an electrode laminate 101.
  • the positive electrode tabs 151 located inside the winding direction of the electrode assembly 100 are combined with each other before the winding step S3 while preventing wrinkles from occurring in the winding step of the electrode assembly 100. Alignment has the effect of matching kinetic balance. In this case, since the negative electrode tab is also coincident in the end portion 1111 of the negative electrode tab 111, the negative electrode tab 111 may have an effect of matching a predetermined portion of the kinetic balance.
  • FIG. 7 is an exploded perspective view illustrating an exploded view of an electrode assembly according to a third exemplary embodiment of the present invention
  • FIG. 8 is a perspective view illustrating a state in which the electrode assemblies of FIG. 7 are stacked
  • FIG. 9 is a view of the electrode assembly of FIG. It is the front view which showed and taken.
  • the electrode assembly manufacturing method according to the third embodiment of the present invention in the stacking step (S1) of the positive electrode tab 151 of the plurality of positive electrodes are located on the same vertical line (V)
  • the negative electrode tabs 111 of the plurality of negative electrodes may be formed to be closer to the distance from the positive electrode tab 151 toward the stacking direction of the negative electrode.
  • the positions of the negative electrode tabs 111 spaced apart from each other may be a position such that the negative electrode tabs 111 overlap on the same vertical line H after being wound in the winding step S3 (see FIG. 9).
  • the positive electrode tabs 151 stacked on each other may be coupled to each other, but the negative electrode tabs 111 may not be coupled to each other.
  • the distance from the cathode tab 151 of the plurality of cathode tabs 111 may be located from the inner side of the winding direction of the electrode assembly 100 in the order of distant from the shortest.
  • the negative electrode tabs 111 positioned to overlap on the same vertical line H may be stacked on each other and joined by welding.
  • ends of the negative electrode tabs 111 coupled to each other may be bent in the center direction of the electrode assembly 100 to minimize the volume increase of the electrode assembly 100.
  • FIG. 10 is a front view showing a state in which the electrode assembly according to the fourth embodiment of the present invention is wound up
  • FIG. 11 is a bottom view of FIG. 10
  • FIG. 12 is a bottom view of the wound electrode assembly according to the fifth embodiment of the present invention. It is a bottom view showing.
  • the positive electrode tabs 151 of the plurality of positive electrodes are stacked on the same vertical line V in the laminating step S1. Steps are stacked on each other, the negative electrode tabs 111 of the plurality of negative electrodes are formed closer to the distance from the positive electrode tab 151 toward the stacking direction of the negative electrode, but winding the position of the plurality of negative electrode tabs are spaced apart from each other It can be made into the position so that it may become equally spaced about the center axis of the electrode laminated body 101 wound by S3.
  • the negative electrode tabs 111 formed on each of the plurality of negative electrodes may be disposed at equal intervals about the central axis of the electrode assembly 100, which is the wound electrode laminate 101. .
  • the negative electrode tabs 111 disposed at equal intervals may be bent in the center direction of the electrode assembly 100, and the ends of the bent negative electrode tabs 111 may be stacked on each other to be joined by welding or the like. have.
  • the shape of the negative electrode tabs 111 disposed at equal intervals according to the number of the negative electrode tabs 111 may have a shape such as a radial shape (see FIG. 11) or a cross shape (see FIG. 12) when viewed from the bottom of the electrode assembly 100. Can be formed.
  • lamination step S1, the electrode tab coupling step S2, and the winding step S3 may be sequentially performed.
  • the electrode assembly 100 according to the first embodiment of the present invention is wound by repeatedly stacking the cathode 110, the separator 130, the anode 150, the electrode assembly A plurality of electrode tabs having the same pole of at least one of the electrode tab of the cathode 110 and the electrode tab of the anode 150 are stacked on the (100).
  • the electrode tab bundle according to the first embodiment is the negative electrode tab bundle 111a or the electrode assembly 100 stacked and coupled to the negative electrode tabs 111 formed on the plurality of cathodes 110 stacked on the electrode assembly 100.
  • the positive electrode tabs 151 formed on the plurality of positive electrodes 150 stacked on the plurality of positive electrode tabs 151a may be stacked and coupled to each other.
  • the plurality of negative electrode tabs 111 or the plurality of positive electrode tabs 151 are welded to each other by neatly stacking electrode tabs of the same pole, so that the movement route of electrons is the same.
  • the cycle characteristics of the secondary battery can be improved.
  • electrode tabs of the cathode 110 stacked on the electrode assembly 100 may be slightly shifted in the winding process after winding. However, it may coincide at the end 1111 of the negative electrode tab through bending.
  • the electrode tabs are stacked on the electrode assembly 100 together with the end portions 1111 of the negative electrode tabs stacked and coupled to the cathode tabs 111 formed on the plurality of cathodes 110 stacked on the electrode assembly 100.
  • the positive electrode tabs 151 formed on the plurality of positive electrodes 150 may include a positive electrode tab bundle 151a stacked and coupled on the same vertical line.
  • the electrode tabs of the same pole are connected to each other by welding or the like to move the electrons.
  • the roots are the same to match the kinetic balance, thereby improving the cycle characteristics of the secondary battery.
  • the electrode assembly according to the second exemplary embodiment of the present invention can minimize the installation space of the negative electrode tab 111 by bending an end portion of the negative electrode tab 111 toward the center of the electrode assembly 100.
  • the electrode assembly according to Embodiment 3 of the present invention repeatedly laminates the cathode 110, the separator 130, and the anode 150, and wound on the electrode assembly 100.
  • the positive electrode tabs 151 formed on the plurality of stacked positive electrodes 150 are wound in a state in which they are stacked and bonded on the same vertical line, and the negative electrode tabs 111 formed on the plurality of negative electrodes 110 stacked on the electrode assembly 100. May be formed to have a close distance from the positive electrode tab 151 according to the stacking direction of the plurality of negative electrodes 110.
  • the plurality of positive electrode tabs 151 are laminated to each other before winding of the electrode assembly 100 and wound up the electrode assembly 100 in a state where they are coupled by welding or the like, and the plurality of negative electrode tabs 111 are spaced apart from each other. After winding the aggregate 100, the ends of the plurality of negative electrode tabs 111 may be laminated to each other and joined by welding or the like.
  • the electrode assembly according to the third exemplary embodiment of the present invention laminates and bonds a plurality of positive electrode tabs 151 to each other on the same vertical line before winding of the electrode assembly 100, thereby combining the positive electrode tab bundles 151a.
  • the plurality of negative electrode tabs 111 may be wound around the electrode assembly 100, and then stacked and combined with each other on the same vertical line to form a negative electrode tab bundle 111 c.
  • the end of the negative electrode tab bundle 111c may be bent toward the center of the electrode assembly 100 to minimize the installation space inside the can member.
  • a plurality of positive electrode tabs 151 are stacked and bonded to each other on the same vertical line before winding of the electrode assembly 100.
  • the positive electrode tab bundle 151a may be formed, and the plurality of negative electrode tabs 111 may be spaced at equal intervals from the center of the electrode assembly 100 after winding the electrode assembly 100.
  • the plurality of negative electrode tabs 111 spaced apart from each other may be bent toward the center portion of the electrode assembly 100 to form the negative electrode tab bundle 111d as the ends of the negative electrode tabs 111 are laminated to each other and subsequently joined by welding or the like. have.
  • the negative electrode tab bundle may be formed of a radial negative electrode tab bundle 111e (see FIG. 11) or various shapes such as a cross-shaped negative electrode tab bundle 111f (see FIG. 12) according to the number of the negative electrode tabs 111. have.
  • FIG. 13 is a perspective view illustrating a secondary battery in which an electrode assembly is accommodated according to various embodiments of the present disclosure.
  • the electrode assembly according to various embodiments of the present invention described above is accommodated in the can member 200 or the like to form a secondary battery.
  • the secondary battery installed with the electrode assembly according to various embodiments of the present disclosure having improved cycle characteristics may maximize charging efficiency.
  • the electrode tabs are aligned and coupled before winding the cathode, the anode, and the separator, there is an effect of maintaining the electrode tabs neatly aligned even after winding and assembling the electrode assembly.
  • the kinetic balance can be kept constant by making the movement route of the electrons constant, thereby improving the cycle characteristics.
  • the electrode assembly according to the present invention and a method of manufacturing the electrode assembly have been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and the present invention within the claims. Various implementations are possible by those skilled in the art.

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  • Manufacturing & Machinery (AREA)
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Abstract

The present invention relates to an electrode assembly and a method for manufacturing the electrode assembly, which allow tabs of a multi-tab electrode assembly to be aligned with each other. In addition, the present invention comprises: a lamination step for forming an electrode laminate by repeatedly laminating a structure in which a negative electrode having an electrode tab, a positive electrode having an electrode tab, and a separator interposed therebetween are laminated; an electrode tab joining step for joining at least two of electrode tabs of the electrode laminate such that electrode tabs having the same polarity are joined with each other; and a winding step for winding the electrode laminate.

Description

전극조립체 및 그 전극조립체의 제조 방법Electrode assembly and manufacturing method of the electrode assembly
관련출원과의 상호인용Citation with Related Applications
본 출원은 2016년 11월 2일자 한국 특허 출원 제10-2016-0145420호 및 2017년 11월 2일자 한국 출원 제10-2017-0145158호에 기초한 우선권의 이익을 주장하며, 해당 한국 특허 출원의 문헌에 개시된 모든 내용은 본 명세서의 일부로서 포함된다.This application claims the benefit of priority based on Korean Patent Application No. 10-2016-0145420 dated November 2, 2016 and Korean Application No. 10-2017-0145158 dated November 2, 2017, and the documents of the Korean patent application All content disclosed in is included as part of this specification.
기술분야Technical Field
본 발명은 전극조립체 및 그 전극조립체의 제조 방법에 관한 것으로서, 보다 자세하게는 멀티 탭을 갖는 전극조립체의 탭을 정렬할 수 있는 전극조립체 및 그 전극조립체의 제조 방법에 관한 것이다.The present invention relates to an electrode assembly and a method of manufacturing the electrode assembly, and more particularly, to an electrode assembly and a method of manufacturing the electrode assembly capable of aligning the tabs of the electrode assembly having a multi-tab.
리튬 2차 전지는 전해질 형태에 따라 리튬 금속전지, 리튬 이온전지, 리튬 2차 전지로 나눌 수 있다.Lithium secondary batteries may be divided into lithium metal batteries, lithium ion batteries, and lithium secondary batteries according to electrolyte types.
여기서 리튬 2차 전지는 견고한 금속 외장을 사용할 필요가 없고, 용도에 따라 다양한 크기와 모양으로 제조할 수 있으며, 3mm 이하 두께로 제작이 가능하고 무게도 30% 이상 줄일 수 있으며, 대량생산 및 대형전지 제조가 가능하다.Lithium secondary battery does not need to use a solid metal enclosure, can be manufactured in various sizes and shapes according to the use, can be manufactured to a thickness of less than 3mm, can reduce the weight by more than 30%, mass production and large batteries Manufacturing is possible.
이런 이유로 리튬 2차 전지는 현재 상용화되어 다양한 분야에서 사용되고 있다.For this reason, lithium secondary batteries are currently commercialized and used in various fields.
대한민국등록특허공보 제10-1136156호에는 종래의 이차전지 및 그 이차전지의 제조방법이 공지되어 있다.Korean Patent No. 10-1136156 discloses a conventional secondary battery and a method of manufacturing the secondary battery.
종래의 전극조립체는 양극판, 음극판, 분리막을 권취한 후 권취된 양극판 및 음극판의 무지부에 각각 단자(또는 전극탭)를 부착하여 전극조립체를 제조하였다.In the conventional electrode assembly, the electrode assembly is manufactured by attaching terminals (or electrode tabs) to the uncoated portions of the wound cathode and anode plates after winding the cathode plate, anode plate, and separator.
하지만, 이러한 전극조립체 제조 방식은 권취된 양극판과 음극판의 무지부에 단자(전극탭)를 부착하기 때문에 복수 개로 구성되는 멀티 전극탭의 경우에 전극탭의 정렬이 어렵다는 문제점이 있다.However, such an electrode assembly manufacturing method has a problem in that it is difficult to align electrode tabs in the case of a multi-electrode tab composed of a plurality of terminals because the terminal (electrode tab) is attached to the uncoated portions of the wound positive and negative plates.
그리고 전극탭 정렬이 일정하지 않으면, 전자 이동 루트가 달라지게 되어 사이클 퇴화의 원인 중 하나인 키네틱 발란스(kinetic balance)가 맞지 않게 되는 문제점이 있다. In addition, if the electrode tab alignment is not constant, the electron transfer route is changed, and there is a problem that the kinetic balance, which is one of the causes of the cycle deterioration, is not matched.
따라서 본 발명은 위와 같은 문제점을 해결하기 위해 안출된 것으로서, 본 발명의 과제는 전극탭을 안정적으로 정렬할 수 있는 전극조립체 및 그 전극조립체의 제조 방법을 제공하는 것이다.Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide an electrode assembly and a method of manufacturing the electrode assembly that can align the electrode tab stably.
본 발명에 따른 전극조립체의 제조 방법은 전극탭을 구비하는 음극과 전극탭을 구비하는 양극 사이에 분리막이 적층되도록 음극, 분리막, 양극을 반복적으로 적층하여 전극적층체를 형성하는 적층 단계, 상기 전극적층체의 전극탭들 중 적어도 두 개 이상을 동일한 극의 전극탭들끼리 결합하는 전극탭 결합 단계 및 상기 전극적층체를 권취하는 권취 단계를 포함하는 것을 특징으로 한다.Method of manufacturing an electrode assembly according to the present invention is a laminating step of forming an electrode laminate by repeatedly stacking a cathode, a separator, and a cathode so that a separator is laminated between a cathode having an electrode tab and an anode having an electrode tab, the electrode And an electrode tab coupling step of coupling at least two or more of the electrode tabs of the laminate to electrode tabs of the same pole and a winding step of winding the electrode laminate.
상기 전극탭들은 상기 음극에 형성된 음극탭과 상기 양극에 형성된 양극탭을 포함하며, 상기 적층 단계에서, 상기 음극, 분리막, 양극은 각각 복수 개로 적층하며, 복수 개의 음극에 형성된 음극탭들은 음극탭끼리 서로 적층하고, 복수 개의 양극에 형성된 양극탭들은 양극탭끼리 서로 적층하며, 상기 전극탭 결합 단계에서, 상기 양극탭은 양극탭끼리, 상기 음극탭은 음극탭끼리 결합될 수 있다.The electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode. In the stacking step, the negative electrode, the separator, and the positive electrode are stacked in plural numbers, and the negative electrode tabs formed on the plurality of negative electrode are connected to each other. The positive electrode tabs stacked on each other and the positive electrode tabs formed on the plurality of positive electrodes may be stacked on each other. In the electrode tab coupling step, the positive electrode tabs may be coupled to the positive electrode tabs, and the negative electrode tabs may be coupled to each other.
상기 전극탭들은 상기 음극에 형성된 음극탭과 상기 양극에 형성된 양극탭을 포함하며, 상기 적층 단계에서, 상기 음극, 분리막, 양극은 각각 복수 개로 적층하며, 복수 개의 음극에 형성된 음극탭들은 음극탭끼리 서로 적층하고, 복수 개의 양극에 형성된 양극탭들은 양극탭끼리 상호 적층하며, 상기 전극탭 결합 단계에서는, 상기 양극탭은 양극탭끼리 결합하되, 상기 음극탭은 음극탭끼리 서로 결합되지 않을 수 있다.The electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode. In the stacking step, the negative electrode, the separator, and the positive electrode are stacked in plural numbers, and the negative electrode tabs formed on the plurality of negative electrode are connected to each other. The positive electrode tabs stacked on each other and the positive electrode tabs formed on the plurality of positive electrodes may be stacked on each other. In the electrode tab coupling step, the positive electrode tabs may be coupled to the positive electrode tabs, and the negative electrode tabs may not be coupled to each other.
상기 권취 단계 이후에 상기 복수 개의 음극에 각각 형성된 음극탭을 상기 전극적층체의 중심 방향으로 절곡하여 단부를 서로 적층할 수 있다.After the winding step, the negative electrode tabs respectively formed on the plurality of negative electrodes may be bent in the direction of the center of the electrode laminate to stack the ends.
상기 적층된 음극탭의 단부들을 상기 전극적층체의 중심 축 방향에서 서로 결합할 수 있다.End portions of the stacked negative electrode tabs may be coupled to each other in a central axis direction of the electrode stack.
상기 적층 단계, 상기 전극탭 결합 단계, 상기 권취 단계는 순차적으로 이루어질 수 있다.The stacking step, the electrode tab coupling step, and the winding step may be sequentially performed.
상기 전극탭들은 상기 음극에 형성된 음극탭과 상기 양극에 형성된 양극탭을 포함하며, 상기 적층 단계에서, 상기 음극, 분리막, 양극은 각각 복수 개로 적층되고, 상기 복수 개의 양극의 양극탭은 동일 수직선상에 위치하고, 상기 복수 개의 음극의 음극탭은 상기 음극의 적층 방향으로 갈수록 상기 양극탭과 이격되는 거리를 가깝게 형성할 수 있다.The electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode. In the stacking step, the negative electrode, the separator, and the positive electrode are stacked in plural numbers, and the positive electrode tabs of the plurality of positive electrodes are on the same vertical line. The negative electrode tabs of the plurality of negative electrodes may be formed closer to the distance from the positive electrode tab toward the stacking direction of the negative electrode.
상기 적층 단계에서, 상기 복수 개의 양극에 형성된 양극탭은 양극탭끼리 서로 적층하고, 상기 전극탭 결합 단계에서는, 상기 양극탭은 양극탭끼리 결합하되, 상기 음극탭은 음극탭끼리 서로 결합되지 않을 수 있다.In the stacking step, the positive electrode tabs formed on the plurality of positive electrodes are stacked on each other, and the positive electrode tabs are coupled to each other in the electrode tab coupling step, but the positive electrode tabs are coupled to each other, and the negative electrode tabs may not be coupled to each other. have.
서로 이격되어 배치되는 상기 복수 개의 음극탭들의 위치는 상기 권취 단계에서 권취된 후에 서로 동일한 수직선 상에 겹쳐지도록 하는 위치일 수 있다.Positions of the plurality of negative electrode tabs spaced apart from each other may be positions to overlap each other on the same vertical line after being wound in the winding step.
상기 권취 단계에서, 상기 양극탭과의 이격되는 거리가 짧은 음극탭이 형성된 음극을 상기 전극적층체의 권취 방향 내측에 위치하도록 상기 전극적층체를 권취할 수 있다.In the winding step, the electrode stacked body may be wound so that the negative electrode tab having a short distance from the positive electrode tab is formed inside the winding direction of the electrode stacked body.
상기 권취 단계에서, 복수 개의 상기 음극탭은 동일 수직선상에서 겹쳐지도록 적층될 수 있다.In the winding step, a plurality of the negative electrode tab may be stacked so as to overlap on the same vertical line.
상기 권취 단계 이후에 상기 복수 개의 음극에 각각 형성된 음극탭을 서로 적층하여 결합할 수 있다.After the winding step, the negative electrode tabs respectively formed on the plurality of negative electrodes may be stacked and combined with each other.
상기 적층하여 결합한 음극탭들의 단부를 권취된 상기 전극적층체의 중심 방향으로 벤딩(bending) 할 수 있다.End portions of the negative electrode tabs stacked and bonded may be bent in a center direction of the wound electrode laminate.
서로 이격되어 배치되는 상기 복수 개의 음극탭들의 위치는, 상기 권취 단계(S3)에서 권취된 전극적층체의 중심축을 중심으로 등간격이 되도록 하는 위치이고, 상기 권취 단계(S3)에서, 상기 복수 개의 음극에 각각 형성된 상기 음극탭은 권취된 상기 전극적층체의 중축을 중심으로 등간격으로 배치되고 상기 권취 단계(S3) 이후에, 상기 음극탭을 권취된 상기 전극적층체의 중심 방향으로 벤딩하고, 벤딩된 상기 음극탭의 단부를 서로 적층하여 결합할 수 있다.Positions of the plurality of negative electrode tabs spaced apart from each other are positions that are equally spaced about a central axis of the electrode stacked body wound in the winding step (S3), and in the winding step (S3), The negative electrode tabs respectively formed on the negative electrode are disposed at equal intervals around the middle axis of the wound electrode laminate, and after the winding step S3, the negative electrode tab is bent toward the center of the wound electrode laminate. End portions of the bent negative electrode tabs may be stacked and bonded to each other.
본 발명에 따른 전극조립체는 음극, 분리막, 양극을 반복적으로 적층하여 권취된 전극집합체, 상기 전극집합체에 적층된 상기 음극의 전극탭들 및 상기 양극의 전극탭들 중 적어도 하나의 동일한 극을 갖는 전극탭들끼리 결합한 전극탭뭉치를 포함하는 것을 특징으로 한다.An electrode assembly according to the present invention is an electrode assembly having a cathode, a separator, an electrode assembly repeatedly stacked by laminating an electrode, an electrode having at least one electrode of the electrode tabs of the negative electrode and the electrode tabs of the positive electrode stacked on the electrode assembly It characterized in that it comprises a bundle of electrode tabs coupled to each other.
상기 전극탭뭉치는, 상기 전극집합체에 적층된 복수 개의 음극에 형성된 음극탭들끼리 적층되어 결합된 음극탭뭉치 및 상기 전극집합체에 적층된 복수 개의 양극에 형성된 양극탭들끼리 적층되어 결합된 양극탭뭉치 중 어느 하나 이상일 수 있다.The electrode tabs are stacked in combination with the negative electrode tabs formed on the plurality of negative electrodes stacked on the electrode assembly, and the positive electrode tabs formed on the positive electrode tabs formed on the plurality of positive electrodes stacked on the electrode assembly are stacked together. It can be any one or more of the bundles.
상기 전극탭뭉치는, 상기 전극집합체에 적층된 복수 개의 음극에 형성된 음극탭을 상기 전극집합체의 중심부 방향으로 벤딩하고 서로 결합한 음극탭뭉치 및 상기 전극집합체에 적층된 복수 개의 양극에 형성된 양극탭들끼리 적층되어 결합된 양극탭뭉치를 포함할 수 있다.The electrode tab bundle may be formed by bending negative electrode tabs formed on the plurality of negative electrodes stacked on the electrode assembly toward the center of the electrode assembly and bonding the negative electrode tabs formed on the plurality of positive electrodes stacked on the electrode assembly. It may include a stack of positively coupled positive electrode tabs.
상기 복수 개의 음극에 형성된 음극탭은 상기 전극집합체를 권취한 상태에서 서로 등간격으로 이격될 수 있다.The negative electrode tabs formed on the plurality of negative electrodes may be spaced at equal intervals from each other in a state in which the electrode assembly is wound.
상기 전극집합체에 적층된 복수 개의 상기 양극의 전극탭은 동일 수직선 상에 위치하고, 상기 전극집합체에 적층된 상기 음극의 전극탭은 복수 개의 상기 음극의 적층 방향에 따라 상기 양극의 전극탭으로부터의 이격 거리가 가까워지고, 상기 음극의 전극탭은 단부가 상기 전극집합체의 중심부에서 서로 겹쳐지도록 벤딩되어 있을 수 있다.Electrode tabs of the plurality of positive electrodes stacked on the electrode assembly are positioned on the same vertical line, and electrode tabs of the negative electrode stacked on the electrode assembly are spaced apart from electrode tabs of the positive electrode according to a stacking direction of the plurality of negative electrodes. The electrode tab of the cathode may be bent to overlap each other at the center of the electrode assembly.
상기 전극집합체에서 동일 수직선 상에 적층된 복수 개의 상기 양극의 전극탭끼리 적층되어 결합된 양극탭뭉치를 포함할 수 있다.In the electrode assembly, a plurality of positive electrode tabs stacked on the same vertical line may include a positive electrode tab bundle.
본 발명에 따르면, 음극과 양극과 분리막을 권취하기 전에 전극탭을 정렬하여 결합하기 때문에 전극조립체를 권취하여 조립한 후에도 전극탭이 가지런하게 정렬된 상태를 유지하게 하는 효과가 있다.According to the present invention, since the electrode tabs are aligned and coupled before winding the cathode, the anode, and the separator, there is an effect of maintaining the electrode tabs neatly aligned even after winding and assembling the electrode assembly.
본 발명에 따르면, 전극탭을 가지런하게 정렬하여 전자의 이동 루트를 일정하게 하는 효과가 있다.According to the present invention, there is an effect of uniformly aligning the electrode tabs to make the movement route of the electrons constant.
본 발명에 따르면, 전자의 이동 루트를 일정하게 하여 키네틱 발란스를 일정하게 유지할 수 있어 사이클 특성을 향상시키는 효과가 있다.According to the present invention, the kinetic balance can be kept constant by making the movement route of the electrons constant, thereby improving the cycle characteristics.
본 발명에 따르면, 권취된 전극조립체에 주름이 발생하는 것을 방지하는 효과가 있다.According to the present invention, there is an effect of preventing wrinkles from occurring in the wound electrode assembly.
본 발명에 따르면, 음극탭에 의해 전극조립체의 크기가 증가하는 것을 방지하는 효과가 있다.According to the present invention, there is an effect of preventing the size of the electrode assembly from increasing by the negative electrode tab.
본 발명에 따르면, 2차 전지의 충전 효율을 극대화하는 효과가 있다.According to the present invention, there is an effect of maximizing the charging efficiency of the secondary battery.
도 1은 본 발명의 실시예 1에 따른 전극조립체 제조 방법을 도시한 흐름도이다.1 is a flowchart illustrating a method of manufacturing an electrode assembly according to Embodiment 1 of the present invention.
도 2는 본 발명의 실시예 1에 따른 전극조립체를 분해하여 도시한 분해 사시도이다.2 is an exploded perspective view illustrating an electrode assembly according to Embodiment 1 of the present invention.
도 3은 도 2를 적층한 것을 도시한 사시도이다.FIG. 3 is a perspective view illustrating the lamination of FIG. 2. FIG.
도 4는 본 발명의 실시예 1에 따른 양극탭뭉치를 도시한 평면도이다.4 is a plan view illustrating a positive electrode tab bundle according to a first embodiment of the present invention.
도 5는 본 발명의 실시예 1에 따른 음극탭뭉치를 도시한 저면도이다.5 is a bottom view illustrating a negative electrode tab bundle according to Embodiment 1 of the present invention.
도 6은 본 발명의 실시예 2에 따른 음극탭뭉치를 도시한 저면도이다.6 is a bottom view illustrating a negative electrode tab bundle according to a second embodiment of the present invention.
도 7은 본 발명의 실시예 3에 따른 전극조립체를 분해하여 도시한 분해 사시도이다.7 is an exploded perspective view illustrating the electrode assembly according to the third embodiment of the present invention.
도 8은 도 7의 전극조립체가 적층된 상태를 도시한 사시도이다.FIG. 8 is a perspective view illustrating a state in which the electrode assemblies of FIG. 7 are stacked.
도 9는 도 8의 전극조립체를 권취하여 도시한 정면도이다.FIG. 9 is a front view illustrating the electrode assembly of FIG. 8 wound up. FIG.
도 10은 본 발명의 실시예 4에 따른 전극조립체가 권취된 상태를 도시한 정면도이다.10 is a front view showing a state in which the electrode assembly according to the fourth embodiment of the present invention is wound.
도 11은 도 10의 저면도이다.FIG. 11 is a bottom view of FIG. 10.
도 12는 본 발명의 실시예 5에 따른 권취된 전극조립체의 저면을 도시한 저면도이다.12 is a bottom view showing the bottom of a wound electrode assembly according to a fifth embodiment of the present invention.
도 13은 본 발명의 다양한 실시예에 따른 전극조립체가 수용된 2차 전지를 도시한 사시도이다.13 is a perspective view illustrating a secondary battery in which an electrode assembly is accommodated according to various embodiments of the present disclosure.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예에 따른 전극조립체 및 그 전극조립체의 제조 방법에 대하여 상세히 설명하기로 한다.Hereinafter, an electrode assembly and a method of manufacturing the electrode assembly according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.
본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일 실시예에 불과하고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물들이 있을 수 있음을 이해하여야 한다.The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents.
도면에서 각 구성요소 또는 그 구성요소를 이루는 특정 부분의 크기는 설명의 편의 및 명확성을 위하여 과장되거나 생략되거나 또는 개략적으로 도시되었다. 따라서, 각 구성요소의 크기는 실제크기를 전적으로 반영하는 것은 아니다. 관련된 공지기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우, 그러한 설명은 생략하도록 한다.In the drawings, the size of each component or a specific portion constituting the components is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Thus, the size of each component does not entirely reflect its actual size. If it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, such description will be omitted.
도 1은 본 발명의 실시예 1에 따른 전극조립체 제조 방법을 도시한 흐름도이다.1 is a flowchart illustrating a method of manufacturing an electrode assembly according to Embodiment 1 of the present invention.
도 1에 도시된 바와 같이, 본 발명의 실시예 1에 따른 전극조립체 제조 방법은 적층 단계(S1), 전극탭 결합 단계(S2) 및 권취 단계(S3)를 포함한다.As shown in FIG. 1, the electrode assembly manufacturing method according to Embodiment 1 of the present invention includes a laminating step S1, an electrode tab coupling step S2, and a winding step S3.
도 2는 본 발명의 실시예 1에 따른 전극조립체를 분해하여 도시한 분해 사시도이고, 도 3은 도 2를 적층한 것을 도시한 사시도이다.FIG. 2 is an exploded perspective view illustrating an exploded view of an electrode assembly according to a first exemplary embodiment of the present invention, and FIG. 3 is a perspective view illustrating a stacked example of FIG. 2.
도 2 및 도 3에 도시된 바와 같이, 본 발명의 실시예 1에 따른 적층 단계(S1)는 전극탭을 구비하는 음극(110)과 전극탭을 구비하는 양극(150) 사이에 분리막(130)이 적층되도록 복수 개의 음극(110), 분리막(130), 양극(150)을 반복적으로 적층하여 전극적층체(101)를 형성하는 단계이다.As shown in FIG. 2 and FIG. 3, the stacking step S1 according to the first exemplary embodiment of the present invention may include a separator 130 between a cathode 110 having electrode tabs and an anode 150 having electrode tabs. The plurality of cathodes 110, the separator 130, and the anode 150 are repeatedly stacked to form the electrode stacked structure 101.
양극(150)은 알루미늄 판일 수 있으며, 양극 활물질이 도포된 양극 활물질부와, 양극 활물질이 도포되지 않은 양극 무지부를 포함할 수 있다.The positive electrode 150 may be an aluminum plate, and may include a positive electrode active material portion coated with a positive electrode active material and a positive electrode non-coated portion not coated with the positive electrode active material.
양극 활물질은 LiCoO2, LiNiO2, LiMnO2, LiMnO4와 같은 리튬 함유 전이금속 산화물 또는 리튬 칼코게나이드 화합물일 수 있다.The positive electrode active material may be a lithium-containing transition metal oxide such as LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMnO 4 , or a lithium chalcogenide compound.
양극 활물질부는 예를 들어, 알루미늄 판의 적어도 어느 한 면의 일부에 양극 활물질을 도포하여 형성하며, 양극 활물질이 미 도포된 알루미늄 판의 나머지 부분이 양극 무지부가 될 수 있다.For example, the positive electrode active material may be formed by applying a positive electrode active material to a portion of at least one surface of the aluminum plate, and the remaining portion of the aluminum plate not coated with the positive electrode active material may be a positive electrode non-coating portion.
양극 무지부에는 양극탭(151)이 전기적으로 연결된다.The positive electrode tab 151 is electrically connected to the positive electrode uncoated portion.
음극(110)은 구리 판일 수 있으며, 음극 활물질이 도포된 음극 활물질부와 음극 활물질이 도포되지 않은 음극 무지부를 포함할 수 있다. The negative electrode 110 may be a copper plate, and may include a negative electrode active material portion coated with a negative electrode active material and a negative electrode non-coated portion not coated with the negative electrode active material.
음극 활물질은, 결정질 탄소, 비정질 탄소, 탄소 복합체, 탄소 섬유와 같은 탄소 재료, 리튬 금속 또는 리튬 합금 등일 수 있다.The negative electrode active material may be crystalline carbon, amorphous carbon, carbon composite, carbon material such as carbon fiber, lithium metal, lithium alloy, or the like.
음극 활물질부는 예를 들어, 구리 판의 적어도 어느 한 면의 일부에 음극 활물질을 도포하여 형성하며, 음극 활물질이 미 도포된 구리 판의 나머지 부분이 음극 무지부가 될 수 있다.For example, the negative electrode active material may be formed by applying a negative electrode active material to a portion of at least one side of the copper plate, and the remaining portion of the copper plate not coated with the negative electrode active material may be a negative electrode non-coating portion.
음극 무지부에는 음극탭(111)이 전기적으로 연결된다.The negative electrode tab 111 is electrically connected to the negative electrode uncoated portion.
분리막(130)은 예를 들어, 폴리에틸렌(PE), 폴리스틸렌(PS), 폴리프로필렌(PP) 및 폴리에틸렌(PE)과 폴리프로필렌(PP)의 공중합체(co-polymer)로 이루어지는 군에서 선택되는 어느 하나의 기재에 폴리비닐리덴 플로우라이드-헥사플로로프로필렌 공중합체(PVDF-HFP co-polymer)를 코팅함으로써 제조될 수 있다. The separator 130 is, for example, 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.
복수 개의 음극(110)에 형성된 음극탭(111)들은 음극탭(111)끼리 서로 적층하고, 복수 개의 양극(150)에 형성된 양극탭(151)들은 양극탭(151)끼리 서로 적층될 수 있다.The negative electrode tabs 111 formed on the plurality of negative electrodes 110 may be stacked on the negative electrode tabs 111, and the positive electrode tabs 151 formed on the plurality of positive electrodes 150 may be stacked on each other.
본 발명의 실시예 1에 따른 전극탭 결합 단계(S2)는 전극적층체(101)에 적층된 각각의 전극에 연결된 전극탭들 중에서 적어도 하나의 동일한 극의 전극탭들끼리 결합하는 단계이다.The electrode tab coupling step S2 according to the first embodiment of the present invention is a step of coupling at least one electrode tab of the same pole among the electrode tabs connected to each electrode stacked on the electrode stack 101.
즉, 전극적층체(101)에 적층된 전극 중에서 각 양극(150)에 전기적으로 연결된 양극탭(151)들끼리 결합하거나, 전극적층체(101)에 적층된 전극 중에서 각 음극(110)에 전기적으로 연결된 음극탭(111)들끼리 결합하는 단계이다. That is, the positive electrode tabs 151 electrically connected to the positive electrodes 150 of the electrodes stacked on the electrode stacked body 101 are coupled to each other, or electrically connected to the respective negative electrodes 110 among the electrodes stacked on the electrode stacked body 101. The negative electrode tabs 111 connected to each other are coupled to each other.
또는, 전극탭 결합 단계(S2)에서 전극적층체(101)에 적층된 전극 중 양극(150)에 전기적으로 연결된 양극탭(151)들은 양극탭(151)들끼리 결합함과 함께 음극(110)에 전기적으로 연결된 음극탭(111)들은 음극탭(111)들끼리 결합할 수 있다.Alternatively, the positive electrode tabs 151 electrically connected to the positive electrode 150 of the electrodes stacked on the electrode stack 101 in the electrode tab coupling step S2 are coupled to the positive electrode tabs 151 and the negative electrode 110. The negative electrode tabs 111 electrically connected to the negative electrode tabs 111 may be coupled to the negative electrode tabs 111.
또한, 음극탭(111)들과 양극탭(151)들은 각각 용접 등에 의해 결합될 수 있다.In addition, the negative electrode tabs 111 and the positive electrode tabs 151 may be coupled to each other by welding or the like.
도 4는 본 발명의 실시예 1에 따른 양극탭뭉치를 도시한 평면도이고, 도 5는 본 발명의 실시예 1에 따른 음극탭뭉치를 도시한 저면도이다.4 is a plan view showing a positive electrode tab bundle according to a first embodiment of the present invention, Figure 5 is a bottom view showing a negative electrode tab bundle according to a first embodiment of the present invention.
도 4 및 도 5에 도시된 바와 같이, 본 발명의 실시예 1에 따른 권취 단계(S3)는 적어도 하나의 동일한 극의 전극탭들끼리 결합한 전극적층체(101)를 권취하여 젤리 롤 형의 전극집합체(100)를 형성하는 단계이다.As shown in Figure 4 and 5, the winding step (S3) according to the first embodiment of the present invention by winding the electrode laminated body 101, the electrode tabs of at least one of the same poles bonded to each other, the electrode of the jelly roll type It is a step of forming the aggregate 100.
한편, 양극탭(151)은 음극탭(111)에 비해 전극집합체(100)의 권취 중심 방향에 위치하기 때문에 전극탭 결합 단계(S2)에서 양극탭(151)들끼리 결합한 후에 권취 단계(S3)에서 전극적층체(101)를 권취하고 권취 단계(S3) 후에 음극탭(111)들끼리 결합하면 전극조립체의 제조를 쉽게 하면서 전극집합체(100)의 전극탭을 가지런하게 정렬할 수 있다. On the other hand, since the positive electrode tab 151 is located in the winding center direction of the electrode assembly 100 as compared to the negative electrode tab 111, the positive electrode tabs 151 are combined with each other in the electrode tab coupling step S2, and then the winding step S3. When the electrode laminate 101 is wound and the negative electrode tabs 111 are coupled to each other after the winding step S3, the electrode tabs of the electrode assembly 100 may be aligned neatly while facilitating the manufacture of the electrode assembly.
또한, 양극탭(151)과 음극탭(111)을 모두 전극탭 결합 단계(S2)에서 양극탭(151)은 양극탭(151)끼리 결합하고 음극탭(111)은 음극탭끼리 결합한 후에 권취 단계(S3)에서 전극적층체(101)를 권취하여 전극집합체(100)를 제조함에 따라 양극탭(151)과 음극탭(111)을 모두 가지런하게 정렬하는 장점도 있다.In addition, both the positive electrode tab 151 and the negative electrode tab 111 combine the positive electrode tab 151 with the positive electrode tab 151 and the negative electrode tab 111 with the negative electrode tab in step S2. As the electrode assembly 100 is manufactured by winding the electrode laminate 101 in S3, the positive electrode tab 151 and the negative electrode tab 111 may be aligned neatly.
도 6은 본 발명의 실시예 2에 따른 음극탭뭉치를 도시한 저면도이다.6 is a bottom view illustrating a negative electrode tab bundle according to a second embodiment of the present invention.
도 6에 도시된 바와 같이, 본 발명의 실시예 2에 따른 적층 단계(S1)는 음극, 분리막, 양극을 각각 복수 개로 적층하며, 복수 개의 음극에 형성된 음극탭(111)들은 음극탭(111)끼리 서로 적층하고, 복수 개의 양극에 형성된 양극탭(151)들은 양극탭(151)끼리 서로 적층할 수 있다.As shown in FIG. 6, the stacking step S1 according to the second embodiment of the present invention stacks a plurality of cathodes, separators, and anodes, respectively, and the cathode tabs 111 formed on the cathodes are negative electrode tabs 111. The positive electrode tabs 151 stacked on each other and the positive electrode tabs 151 formed on the plurality of positive electrodes may be stacked on each other.
그리고 본 발명의 실시예 2에 따른 전극탭 결합 단계(S2)는 적층된 양극탭(151)끼리 용접 등에 의해 서로 결합하고 적층된 음극탭(111)들은 서로 결합하지 않을 수 있다.In the electrode tab coupling step S2 according to the second embodiment of the present invention, the stacked positive electrode tabs 151 may be coupled to each other by welding, and the stacked negative electrode tabs 111 may not be coupled to each other.
본 발명의 실시예 2에 따른 권취 단계(S3)는 양극탭(151)끼리 용접 등에 의해 서로 결합되고 음극탭(111)들은 서로 결합하지 않은 상태에서 전극적층체(101)를 권취할 수 있다.In the winding step S3 according to the second embodiment of the present invention, the positive electrode tabs 151 may be bonded to each other by welding or the like, and the negative electrode tabs 111 may be wound up on the electrode stack 101 without being bonded to each other.
그리고 권취 단계(S3) 이후에 전극적층체(101)를 권취하여 형성된 전극집합체(100)의 복수 개의 음극탭(111)을 전극집합체(100)의 중심 방향으로 절곡하여 복수 개의 음극탭(111)의 단부(1111)를 서로 적층할 수 있다. 서로 적층된 음극탭(111)의 단부(1111)는 전극집합체(100)의 중심 축 방향에서 용접 등에 의해 서로 결합될 수 있다.After the winding step S3, the plurality of negative electrode tabs 111 of the electrode assembly 100 formed by winding the electrode laminate 101 may be bent in the direction of the center of the electrode assembly 100, thereby forming the plurality of negative electrode tabs 111. The ends 1111 of can be stacked on each other. End portions 1111 of the negative electrode tabs 111 stacked on each other may be coupled to each other by welding or the like in the direction of the center axis of the electrode assembly 100.
본 발명의 실시예 2에 따른 전극조립체 제조 방법은 전극탭 결합 단계(S2)에서 양극탭(151)들끼리 용접 결합하고 음극탭(111)들은 결합하지 않은 상태에서 권취 단계(S3)를 통해 전극적층체(101)를 권취하여 전극집합체(100)를 형성하고 음극탭(111)들은 전극집합체(100)를 형성한 후에 음극탭(111)끼리 서로 결합하는 방법 중 하나일 수 있다.In the electrode assembly manufacturing method according to the second embodiment of the present invention, the electrode tabs may be welded to each other by bonding the positive electrode tabs 151 and the negative electrode tabs 111 are not bonded to each other through the winding step (S3). The electrode assembly 100 may be formed by winding the stack 101, and the negative electrode tabs 111 may be one of methods in which the negative electrode tabs 111 are coupled to each other after forming the electrode assembly 100.
상술한 본 발명의 실시예 2에 따른 전극조립체 제조 방법은 전극집합체(100)의 권취 방향 외측에 위치하는 음극탭(111)들을 상기 권취 단계(S3) 이후에 서로 결합하여 전극적층체(101)의 권취 단계에서 주름이 발생하는 현상(일명 우는 현상)을 방지하면서도 전극집합체(100)의 권취 방향 내측에 위치하는 양극탭(151)들을 권취 단계(S3) 이전에 서로 결합하여 전극탭을 가지런하게 정렬하여 키네틱 발란스(kinetic balance)를 일치시키는 효과가 있다. 또, 이 경우 음극탭(111)의 단부(1111)에서는 음극탭도 일치되는 부분이 있으므로, 음극탭(111)에서도 일정부분 키네틱 발란스를 일치시키는 효과를 가질 수 있다.In the electrode assembly manufacturing method according to the second embodiment of the present invention described above, the negative electrode tabs 111 positioned outside the winding direction of the electrode assembly 100 are coupled to each other after the winding step S3 to form an electrode laminate 101. The positive electrode tabs 151 located inside the winding direction of the electrode assembly 100 are combined with each other before the winding step S3 while preventing wrinkles from occurring in the winding step of the electrode assembly 100. Alignment has the effect of matching kinetic balance. In this case, since the negative electrode tab is also coincident in the end portion 1111 of the negative electrode tab 111, the negative electrode tab 111 may have an effect of matching a predetermined portion of the kinetic balance.
도 7은 본 발명의 실시예 3에 따른 전극조립체를 분해하여 도시한 분해 사시도이고, 도 8은 도 7의 전극조립체가 적층된 상태를 도시한 사시도이고, 도 9는 도 8의 전극조립체를 권취하여 도시한 정면도이다.FIG. 7 is an exploded perspective view illustrating an exploded view of an electrode assembly according to a third exemplary embodiment of the present invention, FIG. 8 is a perspective view illustrating a state in which the electrode assemblies of FIG. 7 are stacked, and FIG. 9 is a view of the electrode assembly of FIG. It is the front view which showed and taken.
도 7 내지 도 9에 도시된 바와 같이, 본 발명의 실시예 3에 따른 전극조립체 제조 방법은 적층 단계(S1)에서 복수 개의 양극의 양극탭(151)은 동일 수직선상(V)에 위치하여 서로 적층하고, 복수 개의 음극의 음극탭(111)은 음극의 적층 방향으로 갈수록 양극탭(151)과 이격되는 거리를 가깝게 형성할 수 있다.As shown in Figure 7 to 9, in the electrode assembly manufacturing method according to the third embodiment of the present invention in the stacking step (S1) of the positive electrode tab 151 of the plurality of positive electrodes are located on the same vertical line (V) The negative electrode tabs 111 of the plurality of negative electrodes may be formed to be closer to the distance from the positive electrode tab 151 toward the stacking direction of the negative electrode.
이때, 서로 이격되는 음극탭(111)들의 위치는 권취 단계(S3)에서 권취된 후에 음극탭(111)들이 동일한 수직선(H)상에 겹쳐지도록 하는 위치일 수 있다(도 9 참조).At this time, the positions of the negative electrode tabs 111 spaced apart from each other may be a position such that the negative electrode tabs 111 overlap on the same vertical line H after being wound in the winding step S3 (see FIG. 9).
전극탭 결합 단계(S2)에서는 서로 적층된 양극탭(151)들끼리 결합하되, 음극탭(111)들은 서로 결합하지 않을 수 있다.In the electrode tab coupling step S2, the positive electrode tabs 151 stacked on each other may be coupled to each other, but the negative electrode tabs 111 may not be coupled to each other.
권취 단계(S3)에서는 양극탭(151)들이 권취되는 전극적층체(101)의 권취 방향 중심측에 위치하도록 전극적층체(101)를 권취하면서 권취되는 전극적층체(101)의 음극탭(111)들은 동일한 수직선상에서 겹쳐지는 상태가 될 수 있다. 이때, 복수개의 음극탭(111) 중에서 양극탭(151)과의 거리가 가장 짧은 것에서부터 먼 순서대로 전극집합체(100)의 권취 방향 내측에서부터 외측으로 위치할 수 있다.In the winding step S3, the negative electrode tab 111 of the electrode laminate 101 wound while winding the electrode laminate 101 so as to be positioned at the center side of the winding direction of the electrode laminate 101 in which the positive electrode tabs 151 are wound. ) May be overlapped on the same vertical line. At this time, the distance from the cathode tab 151 of the plurality of cathode tabs 111 may be located from the inner side of the winding direction of the electrode assembly 100 in the order of distant from the shortest.
그리고 권취 단계(S3) 이후에 동일한 수직선(H)상에 겹쳐지도록 위치한 음극탭(111)들을 서로 적층하여 용접 등에 의해 결합할 수 있다.After the winding step S3, the negative electrode tabs 111 positioned to overlap on the same vertical line H may be stacked on each other and joined by welding.
또한, 서로 결합된 음극탭(111)의 단부를 전극집합체(100)의 중심 방향으로 벤딩(bending)하여 전극집합체(100)의 부피 증가를 극소화할 수 있다.In addition, the ends of the negative electrode tabs 111 coupled to each other may be bent in the center direction of the electrode assembly 100 to minimize the volume increase of the electrode assembly 100.
도 10은 본 발명의 실시예 4에 따른 전극조립체가 권취된 상태를 도시한 정면도이고, 도 11은 도 10의 저면도이고, 도 12는 본 발명의 실시예 5에 따른 권취된 전극조립체의 저면을 도시한 저면도이다.10 is a front view showing a state in which the electrode assembly according to the fourth embodiment of the present invention is wound up, FIG. 11 is a bottom view of FIG. 10, and FIG. 12 is a bottom view of the wound electrode assembly according to the fifth embodiment of the present invention. It is a bottom view showing.
도 11 및 도 12에 도시된 바와 같이, 본 발명의 실시예 4, 실시예 5에 따른 전극조립체 제조 방법은 적층 단계(S1)에서 복수 개의 양극의 양극탭(151)은 동일 수직선상(V)에 위치하여 서로 적층하고, 복수 개의 음극의 음극탭(111)은 음극의 적층 방향으로 갈수록 양극탭(151)과 이격되는 거리를 가깝게 형성하되 서로 이격되어 배치되는 복수 개의 음극탭들의 위치를 권취 단계(S3)에서 권취된 전극적층체(101)의 중심축을 중심으로 등간격이 되도록 하는 위치로 할 수 있다.11 and 12, in the electrode assembly manufacturing method according to the fourth and fifth embodiments of the present invention, the positive electrode tabs 151 of the plurality of positive electrodes are stacked on the same vertical line V in the laminating step S1. Steps are stacked on each other, the negative electrode tabs 111 of the plurality of negative electrodes are formed closer to the distance from the positive electrode tab 151 toward the stacking direction of the negative electrode, but winding the position of the plurality of negative electrode tabs are spaced apart from each other It can be made into the position so that it may become equally spaced about the center axis of the electrode laminated body 101 wound by S3.
그 결과 권취 단계(S3)에서 권취하게 되면, 복수개의 음극에 각각 형성된 음극탭(111)은 권취된 전극적층체(101)인 전극집합체(100)의 중심축을 중심으로 등간격으로 배치될 수 있다.As a result, when winding up in the winding step (S3), the negative electrode tabs 111 formed on each of the plurality of negative electrodes may be disposed at equal intervals about the central axis of the electrode assembly 100, which is the wound electrode laminate 101. .
그리고 권취 단계(S3) 이후에 등간격으로 배치된 음극탭(111)들을 전극집합체(100)의 중심 방향으로 벤딩하고, 벤딩된 음극탭(111)들의 단부를 서로 적층하여 용접 등에 의해 결합할 수 있다. 이때, 음극탭(111)의 개수에 따라 등간격으로 배치된 음극탭(111)의 형상은 전극집합체(100)의 저면에서 보아 방사형(도 11 참조) 또는 십자형(도 12 참조) 등의 형상을 형성할 수 있다.After the winding step S3, the negative electrode tabs 111 disposed at equal intervals may be bent in the center direction of the electrode assembly 100, and the ends of the bent negative electrode tabs 111 may be stacked on each other to be joined by welding or the like. have. At this time, the shape of the negative electrode tabs 111 disposed at equal intervals according to the number of the negative electrode tabs 111 may have a shape such as a radial shape (see FIG. 11) or a cross shape (see FIG. 12) when viewed from the bottom of the electrode assembly 100. Can be formed.
상술한 적층 단계(S1), 전극탭 결합 단계(S2) 및 권취 단계(S3)는 순차적으로 이루어질 수 있다.The above-described lamination step S1, the electrode tab coupling step S2, and the winding step S3 may be sequentially performed.
도면을 참조하여 본 발명의 다양한 일실시예에 따른 전극조립체를 상세히 설명한다.Referring to the drawings will be described in detail the electrode assembly according to various embodiments of the present invention.
도 2 내지 도 5에 도시된 바와 같이, 본 발명의 실시예 1에 따른 전극조립체(100)는 음극(110), 분리막(130), 양극(150)을 반복적으로 적층하여 권취되며, 상기 전극집합체(100)에 적층된 상기 음극(110)의 전극탭 및 상기 양극(150)의 전극탭 중 적어도 하나의 동일한 극을 갖는 전극탭끼리 결합된 전극탭뭉치를 포함한다.2 to 5, the electrode assembly 100 according to the first embodiment of the present invention is wound by repeatedly stacking the cathode 110, the separator 130, the anode 150, the electrode assembly A plurality of electrode tabs having the same pole of at least one of the electrode tab of the cathode 110 and the electrode tab of the anode 150 are stacked on the (100).
상기 전극탭뭉치는 실시예 1로 상기 전극집합체(100)에 적층된 복수 개의 음극(110)에 형성된 음극탭(111)들끼리 적층되어 결합된 음극탭뭉치(111a) 또는 상기 전극집합체(100)에 적층된 복수 개의 양극(150)에 형성된 양극탭(151)들끼리 적층되어 결합된 양극탭뭉치(151a)를 포함할 수 있다.The electrode tab bundle according to the first embodiment is the negative electrode tab bundle 111a or the electrode assembly 100 stacked and coupled to the negative electrode tabs 111 formed on the plurality of cathodes 110 stacked on the electrode assembly 100. The positive electrode tabs 151 formed on the plurality of positive electrodes 150 stacked on the plurality of positive electrode tabs 151a may be stacked and coupled to each other.
이와 같이, 본 발명의 실시예 1에 따른 전극조립체는 복수 개의 음극탭(111)또는 복수 개의 양극탭(151)을 동일한 극의 전극탭끼리 가지런하게 적층하여 용접 결합하기 때문에 전자의 이동 루트가 동일하게 되어 키네틱 발란스를 일치시킴으로 인해 2차 전지의 사이클 특성을 향상시킬 수 있다.As described above, in the electrode assembly according to the first exemplary embodiment of the present invention, the plurality of negative electrode tabs 111 or the plurality of positive electrode tabs 151 are welded to each other by neatly stacking electrode tabs of the same pole, so that the movement route of electrons is the same. By matching the kinetic balance, the cycle characteristics of the secondary battery can be improved.
도 6에 도시된 바와 같이, 본 발명의 실시예 2에 따른 전극조립체는 권취 후에 전극집합체(100)에 적층된 음극(110)의 전극탭들이 권취 과정에서 위치가 약간씩 어긋나 있을 수 있다. 그러나 벤딩을 통해서 음극탭의 단부(1111)에서는 일치되어 있을 수 있다.As shown in FIG. 6, in the electrode assembly according to the second exemplary embodiment of the present invention, electrode tabs of the cathode 110 stacked on the electrode assembly 100 may be slightly shifted in the winding process after winding. However, it may coincide at the end 1111 of the negative electrode tab through bending.
그리고 상기 전극탭뭉치는 전극집합체(100)에 적층된 복수 개의 음극(110)에 형성된 음극탭(111)들끼리 적층되어 결합된 음극탭의 단부(1111)와 함께 전극집합체(100)에 적층된 복수 개의 양극(150)에 형성된 양극탭(151)들끼리 동일 수직선상에 적층되어 결합된 양극탭뭉치(151a)를 포함할 수 있다.The electrode tabs are stacked on the electrode assembly 100 together with the end portions 1111 of the negative electrode tabs stacked and coupled to the cathode tabs 111 formed on the plurality of cathodes 110 stacked on the electrode assembly 100. The positive electrode tabs 151 formed on the plurality of positive electrodes 150 may include a positive electrode tab bundle 151a stacked and coupled on the same vertical line.
이와 같이, 본 발명의 실시예 2에 따른 전극조립체는 복수 개의 음극탭(111)과 복수 개의 양극탭(151)을 각각 동일한 극의 전극탭끼리 가지런하게 적층하여 용접 등에 의해 결합하기 때문에 전자의 이동 루트가 동일하게 되어 키네틱 발란스를 일치시킴으로 인해 2차 전지의 사이클 특성을 향상시킬 수 있다.As described above, in the electrode assembly according to the second exemplary embodiment of the present invention, since the plurality of negative electrode tabs 111 and the plurality of positive electrode tabs 151 are stacked in the same manner, the electrode tabs of the same pole are connected to each other by welding or the like to move the electrons. The roots are the same to match the kinetic balance, thereby improving the cycle characteristics of the secondary battery.
한편, 전극집합체(100)를 캔부재의 내부에 설치 시 음극탭(111)은 캔부재의 저면 측에 접촉하기 때문에 음극탭(111)을 캔부재의 저면 측으로 곧게 형성하게 되면 캔부재 내부 공간을 지나치게 많이 차지하게되어 이차전지의 용량 저하의 원인이 될 수 있다.On the other hand, when the electrode assembly 100 is installed inside the can member, since the negative electrode tab 111 contacts the bottom side of the can member, when the negative electrode tab 111 is straightly formed on the bottom side of the can member, the inner space of the can member is formed. Too much charge may cause a decrease in capacity of the secondary battery.
따라서 본 발명의 실시예 2에 따른 전극조립체는 음극탭(111)의 단부를 전극집합체(100)의 중심부 방향으로 벤딩하여 음극탭(111)의 설치 공간을 극소화할 수 있다.Therefore, the electrode assembly according to the second exemplary embodiment of the present invention can minimize the installation space of the negative electrode tab 111 by bending an end portion of the negative electrode tab 111 toward the center of the electrode assembly 100.
도 7 및 도 8에 도시된 바와 같이, 본 발명의 실시예 3에 따른 전극조립체는 음극(110), 분리막(130), 양극(150)을 반복적으로 적층하여 권취하는데, 전극집합체(100)에 적층된 복수 개의 양극(150)에 형성된 양극탭(151)은 동일 수직선상에 적층되어 결합된 상태에서 권취되며, 전극집합체(100)에 적층된 복수의 음극(110)에 형성된 음극탭(111)은 복수 개의 음극(110)의 적층 방향에 따라 양극탭(151)으로부터 이격 거리가 가깝게 형성될 수 있다.As shown in FIG. 7 and FIG. 8, the electrode assembly according to Embodiment 3 of the present invention repeatedly laminates the cathode 110, the separator 130, and the anode 150, and wound on the electrode assembly 100. The positive electrode tabs 151 formed on the plurality of stacked positive electrodes 150 are wound in a state in which they are stacked and bonded on the same vertical line, and the negative electrode tabs 111 formed on the plurality of negative electrodes 110 stacked on the electrode assembly 100. May be formed to have a close distance from the positive electrode tab 151 according to the stacking direction of the plurality of negative electrodes 110.
즉, 복수 개의 양극탭(151)은 전극집합체(100)의 권취 전에 서로 적층되어 용접 등에 의해 결합된 상태로 전극집합체(100)를 권취하고, 복수 개의 음극탭(111)은 서로 이격된 채로 전극집합체(100)를 권취한 후에 복수 개의 음극탭(111)의 단부를 서로 적층하여 용접 등에 의해 결합할 수 있다.That is, the plurality of positive electrode tabs 151 are laminated to each other before winding of the electrode assembly 100 and wound up the electrode assembly 100 in a state where they are coupled by welding or the like, and the plurality of negative electrode tabs 111 are spaced apart from each other. After winding the aggregate 100, the ends of the plurality of negative electrode tabs 111 may be laminated to each other and joined by welding or the like.
도 9에 도시된 바와같이, 본 발명의 실시예 3에 따른 전극조립체는 복수 개의 양극탭(151)을 전극집합체(100)의 권취 전에 동일 수직선 상에서 서로 적층하고 결합하여 양극탭뭉치(151a)를 형성할 수 있고, 복수 개의 음극탭(111)을 전극집합체(100)를 권취 한 후에 동일 수직선 상에서 서로 적층하고 결합하여 음극탭뭉치(111c)를 형성할 수 있다.As shown in FIG. 9, the electrode assembly according to the third exemplary embodiment of the present invention laminates and bonds a plurality of positive electrode tabs 151 to each other on the same vertical line before winding of the electrode assembly 100, thereby combining the positive electrode tab bundles 151a. The plurality of negative electrode tabs 111 may be wound around the electrode assembly 100, and then stacked and combined with each other on the same vertical line to form a negative electrode tab bundle 111 c.
그리고 음극탭뭉치(111c)의 단부를 전극집합체(100)의 중심부측으로 벤딩하여 캔부재 내부에서의 설치 공간을 극소화할 수 있다.The end of the negative electrode tab bundle 111c may be bent toward the center of the electrode assembly 100 to minimize the installation space inside the can member.
도 10 내지 도 12에 도시된 바와 같이, 본 발명의 실시예 4, 실시예 5에 따른 전극조립체는 복수 개의 양극탭(151)이 전극집합체(100)의 권취 전에 동일 수직선 상에서 서로 적층하고 결합하여 양극탭뭉치(151a)를 형성할 수 있고, 복수 개의 음극탭(111)은 전극집합체(100)를 권취 한 후에 전극집합체(100)의 중앙부를 중심으로 서로 등간격으로 이격될 수 있다. 그리고 서로 이격된 복수 개의 음극탭(111)은 전극집합체(100)의 중앙부 측으로 벤딩되어 음극탭(111)들의 단부를 서로 적층한 후에 용접 등에 의래 결합함에 따라 음극탭뭉치(111d)를 형성할 수 있다.As shown in FIGS. 10 to 12, in the electrode assemblies according to the fourth and fifth embodiments of the present invention, a plurality of positive electrode tabs 151 are stacked and bonded to each other on the same vertical line before winding of the electrode assembly 100. The positive electrode tab bundle 151a may be formed, and the plurality of negative electrode tabs 111 may be spaced at equal intervals from the center of the electrode assembly 100 after winding the electrode assembly 100. In addition, the plurality of negative electrode tabs 111 spaced apart from each other may be bent toward the center portion of the electrode assembly 100 to form the negative electrode tab bundle 111d as the ends of the negative electrode tabs 111 are laminated to each other and subsequently joined by welding or the like. have.
한편, 음극탭뭉치는 음극탭(111)의 개수에 따라 방사형 음극탭뭉치(111e)(도 11 참조)로 형성되거나 십자형 음극탭뭉치(111f)(도 12 참조) 등과 같은 다양한 형상을 형성할 수 있다.Meanwhile, the negative electrode tab bundle may be formed of a radial negative electrode tab bundle 111e (see FIG. 11) or various shapes such as a cross-shaped negative electrode tab bundle 111f (see FIG. 12) according to the number of the negative electrode tabs 111. have.
도 13은 본 발명의 다양한 실시예에 따른 전극조립체가 수용된 2차 전지를 도시한 사시도이다.13 is a perspective view illustrating a secondary battery in which an electrode assembly is accommodated according to various embodiments of the present disclosure.
도 13에 도시된 바와 같이, 상술한 본 발명의 다양한 실시예에 따른 전극조립체는 캔부재(200) 등에 수용되어 2차 전지를 형성한다.As shown in FIG. 13, the electrode assembly according to various embodiments of the present invention described above is accommodated in the can member 200 or the like to form a secondary battery.
그리고 사이클 특성이 향상된 본 발명의 다양한 실시예에 따른 전극조립체가 설치된 2차 전지는 충전 효율이 극대화될 수 있다. In addition, the secondary battery installed with the electrode assembly according to various embodiments of the present disclosure having improved cycle characteristics may maximize charging efficiency.
상술한 바와 같이 본 발명에 따르면, 음극과 양극과 분리막을 권취하기 전에 전극탭을 정렬하여 결합하기 때문에 전극조립체를 권취하여 조립한 후에도 전극탭이 가지런하게 정렬된 상태를 유지하게 하는 효과가 있다.As described above, according to the present invention, since the electrode tabs are aligned and coupled before winding the cathode, the anode, and the separator, there is an effect of maintaining the electrode tabs neatly aligned even after winding and assembling the electrode assembly.
본 발명에 따르면, 전극탭을 가지런하게 정렬하여 전자의 이동 루트를 일정하게 하는 효과가 있다.According to the present invention, there is an effect of uniformly aligning the electrode tabs to make the movement route of the electrons constant.
본 발명에 따르면, 전자의 이동 루트를 일정하게 하여 키네틱 발란스를 일정하게 유지할 수 있어 사이클 특성을 향상시키는 효과가 있다.According to the present invention, the kinetic balance can be kept constant by making the movement route of the electrons constant, thereby improving the cycle characteristics.
본 발명에 따르면, 권취된 전극조립체에 주름이 발생하는 것을 방지하는 효과가 있다.According to the present invention, there is an effect of preventing wrinkles from occurring in the wound electrode assembly.
본 발명에 따르면, 음극탭에 의해 전극조립체의 크기가 증가하는 것을 방지하는 효과가 있다.According to the present invention, there is an effect of preventing the size of the electrode assembly from increasing by the negative electrode tab.
본 발명에 따르면, 2차 전지의 충전 효율을 극대화하는 효과가 있다.According to the present invention, there is an effect of maximizing the charging efficiency of the secondary battery.
이상과 같이 본 발명에 따른 전극조립체 및 그 전극조립체의 제조 방법을 예시된 도면을 참고하여 설명하였으나, 본 발명은 이상에서 설명된 실시예와 도면에 의해 한정되지 않으며, 특허청구범위 내에서 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자들에 의해 다양한 실시가 가능하다.As described above, the electrode assembly according to the present invention and a method of manufacturing the electrode assembly have been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and the present invention within the claims. Various implementations are possible by those skilled in the art.

Claims (20)

  1. 전극탭을 구비하는 음극과 전극탭을 구비하는 양극 사이에 분리막이 적층되도록 음극, 분리막, 양극을 반복적으로 적층하여 전극적층체를 형성하는 적층 단계(S1); A stacking step (S1) of forming an electrode stack by repeatedly stacking a cathode, a separator, and an anode such that a separator is stacked between a cathode having an electrode tab and an anode having an electrode tab;
    상기 전극적층체의 전극탭들 중 적어도 두 개 이상을 동일한 극의 전극탭들끼리 결합하는 전극탭 결합 단계(S2); 및 An electrode tab coupling step (S2) of coupling at least two or more of the electrode tabs of the electrode stack to electrode tabs of the same pole; And
    상기 전극적층체를 권취하는 권취 단계(S3); 를 포함하는 것을 특징으로 하는 전극조립체 제조 방법.A winding step (S3) of winding up the electrode laminate; Electrode assembly manufacturing method comprising a.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 전극탭들은 상기 음극에 형성된 음극탭과 상기 양극에 형성된 양극탭을 포함하며,The electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode,
    상기 적층 단계(S1)에서,In the lamination step (S1),
    상기 음극, 분리막, 양극은 각각 복수 개로 적층하며, 복수 개의 음극에 형성된 음극탭들은 음극탭끼리 서로 적층하고, 복수 개의 양극에 형성된 양극탭들은 양극탭끼리 서로 적층하며,The negative electrode, the separator, and the positive electrode are stacked in plural numbers, the negative electrode tabs formed in the plurality of negative electrode are stacked on each other, the positive electrode tabs formed on the plurality of positive electrodes are laminated on each other,
    상기 전극탭 결합 단계(S2)에서,In the electrode tab coupling step (S2),
    상기 양극탭은 양극탭끼리, 상기 음극탭은 음극탭끼리 결합되도록 하는 것을 특징으로 하는 전극조립체 제조 방법.The positive electrode tab is a positive electrode tab, the negative electrode tab is a cathode assembly manufacturing method, characterized in that for coupling to the negative electrode tab.
  3. 청구항 1에 있어서,The method according to claim 1,
    상기 전극탭들은 상기 음극에 형성된 음극탭과 상기 양극에 형성된 양극탭을 포함하며,The electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode,
    상기 적층 단계(S1)에서,In the lamination step (S1),
    상기 음극, 분리막, 양극은 각각 복수 개로 적층하며, 복수 개의 음극에 형성된 음극탭들은 음극탭끼리 서로 적층하고, 복수 개의 양극에 형성된 양극탭들은 양극탭끼리 서로 적층하며,The negative electrode, the separator, and the positive electrode are stacked in plural numbers, the negative electrode tabs formed in the plurality of negative electrode are stacked on each other, the positive electrode tabs formed on the plurality of positive electrodes are laminated on each other,
    상기 전극탭 결합 단계(S2)에서는,In the electrode tab coupling step (S2),
    상기 양극탭은 양극탭끼리 결합하되, 상기 음극탭은 음극탭끼리 서로 결합되지 않는 것을 특징으로 하는 전극조립체 제조 방법.The positive electrode tab is coupled to the positive electrode tab, the negative electrode tab manufacturing method of the electrode assembly, characterized in that the negative electrode tab is not bonded to each other.
  4. 청구항 3에 있어서,The method according to claim 3,
    상기 권취 단계(S3) 이후에 상기 복수 개의 음극에 각각 형성된 음극탭을 상기 전극적층체의 중심 방향으로 절곡하여 단부를 서로 적층하는 것을 특징으로 하는 전극조립체 제조 방법.After the winding step (S3), the negative electrode tabs respectively formed in the plurality of negative electrodes are bent in the direction of the center of the electrode laminated body, the electrode assembly manufacturing method characterized in that the end is laminated.
  5. 청구항 4에 있어서,The method according to claim 4,
    상기 적층된 음극탭의 단부들을 상기 전극적층체의 중심 축 방향에서 서로 결합하는 것을 특징으로 하는 전극조립체 제조 방법.And an end portion of the stacked negative electrode tabs coupled to each other in the direction of the center axis of the electrode laminate.
  6. 청구항 1에 있어서,The method according to claim 1,
    상기 적층 단계(S1), 상기 전극탭 결합 단계(S2), 상기 권취 단계(S3)는 순차적으로 이루어지는 것을 특징으로 하는 전극조립체 제조 방법.The stacking step (S1), the electrode tab coupling step (S2), the winding step (S3) is an electrode assembly manufacturing method characterized in that it is made sequentially.
  7. 청구항 1에 있어서,The method according to claim 1,
    상기 전극탭들은 상기 음극에 형성된 음극탭과 상기 양극에 형성된 양극탭을 포함하며,The electrode tabs include a negative electrode tab formed on the negative electrode and a positive electrode tab formed on the positive electrode,
    상기 적층 단계(S1)에서,In the lamination step (S1),
    상기 음극, 분리막, 양극은 각각 복수 개로 적층되고, 상기 복수 개의 양극의 양극탭은 동일 수직선상에 위치하고, 상기 복수 개의 음극의 음극탭은 상기 음극의 적층 방향으로 갈수록 상기 양극탭과 이격되는 거리를 가깝게 형성하는 것을 특징으로 하는 전극조립체 제조 방법.The cathode, the separator and the anode are each stacked in plural, and the positive electrode tabs of the plurality of positive electrodes are positioned on the same vertical line, and the negative electrode tabs of the plurality of negative electrodes are spaced apart from the positive electrode tab toward the stacking direction of the negative electrode. Electrode assembly manufacturing method characterized in that forming close.
  8. 청구항 7에 있어서,The method according to claim 7,
    상기 적층 단계(S1)에서,In the lamination step (S1),
    상기 복수 개의 양극에 형성된 양극탭은 양극탭끼리 서로 적층하고,Positive electrode tabs formed on the plurality of positive electrodes are stacked on each other,
    상기 전극탭 결합 단계(S2)에서는,In the electrode tab coupling step (S2),
    상기 양극탭은 양극탭끼리 결합하되, 상기 음극탭은 음극탭끼리 서로 결합되지 않는 것을 특징으로 하는 전극조립체 제조 방법.The positive electrode tab is coupled to the positive electrode tab, the negative electrode tab manufacturing method of the electrode assembly, characterized in that the negative electrode tab is not bonded to each other.
  9. 청구항 8에 있어서,The method according to claim 8,
    서로 이격되어 배치되는 상기 복수 개의 음극탭의 위치는 상기 권취 단계(S3)에서 권취된 후에 서로 동일한 수직선 상에 겹쳐지도록 하는 위치인 것을 특징으로 하는 전극조립체 제조 방법.The position of the plurality of negative electrode tabs spaced apart from each other is an electrode assembly manufacturing method, characterized in that the position to overlap on the same vertical line with each other after being wound in the winding step (S3).
  10. 청구항 9에 있어서,The method according to claim 9,
    상기 권취 단계(S3)에서,In the winding step (S3),
    상기 양극탭과의 이격되는 거리가 짧은 음극탭이 형성된 음극을 상기 전극적층체의 권취 방향 내측에 위치하도록 상기 전극적층체를 권취하는 것을 특징으로 하는 전극조립체 제조 방법.The electrode assembly manufacturing method according to claim 1, wherein the electrode laminate is wound so that the negative electrode tab having a short distance from the positive electrode tab is formed inside the winding direction of the electrode laminate.
  11. 청구항 10에 있어서,The method according to claim 10,
    상기 권취 단계(S3)에서,In the winding step (S3),
    복수 개의 상기 음극탭은 동일 수직선상에서 겹쳐지도록 적층되는 것을 특징으로 하는 전극조립체 제조 방법.The method of claim 1, wherein the negative electrode tab is stacked to overlap on the same vertical line.
  12. 청구항 11에 있어서,The method according to claim 11,
    상기 권취 단계(S3) 이후에 상기 복수 개의 음극에 각각 형성된 음극탭을 서로 적층하여 결합하는 것을 특징으로 하는 전극조립체 제조 방법.After the winding step (S3) of the electrode assembly manufacturing method, characterized in that for coupling to each other the negative electrode tab formed on the plurality of negative electrodes.
  13. 청구항 12에 있어서,The method according to claim 12,
    상기 적층하여 결합한 음극탭들의 단부를 권취된 상기 전극적층체의 중심 방향으로 벤딩(bending)하는 것을 특징으로 하는 전극조립체 제조 방법.And bending the end portions of the negative electrode tabs laminated and bonded in a direction of the center of the wound electrode laminate.
  14. 청구항 8에 있어서,The method according to claim 8,
    서로 이격되어 배치되는 상기 복수 개의 음극탭들의 위치는, 상기 권취 단계(S3)에서 권취된 전극적층체의 중심축을 중심으로 등간격이 되도록 하는 위치이고,Positions of the plurality of negative electrode tabs spaced apart from each other, are positions to be equally spaced about the central axis of the electrode stacked body wound in the winding step (S3),
    상기 권취 단계(S3)에서,In the winding step (S3),
    상기 복수 개의 음극에 각각 형성된 상기 음극탭은 권취된 상기 전극적층체의 중축을 중심으로 등간격으로 배치되고The negative electrode tabs respectively formed on the plurality of negative electrodes are disposed at equal intervals around the central axis of the wound electrode laminate.
    상기 권취 단계(S3) 이후에,After the winding step (S3),
    상기 음극탭을 권취된 상기 전극적층체의 중심 방향으로 벤딩하고, 벤딩된 상기 음극탭의 단부를 서로 적층하여 결합하는 것을 특징으로 하는 전극조립체 제조 방법.And bending the negative electrode tab in a center direction of the wound electrode laminate, and stacking and bonding the end portions of the bent negative electrode tab to each other.
  15. 음극(110), 분리막(130), 양극(150)을 반복적으로 적층하여 권취된 전극집합체(100);An electrode assembly 100 wound by repeatedly stacking a cathode 110, a separator 130, and an anode 150;
    상기 전극집합체(100)에 적층된 상기 음극(110)의 전극탭들 및 상기 양극(150)의 전극탭들 중 적어도 하나의 동일한 극을 갖는 전극탭들끼리 결합한 전극탭뭉치; 를 포함하는 것을 특징으로 하는 전극조립체.A plurality of electrode tabs coupled to electrode tabs having the same pole of at least one of the electrode tabs of the cathode 110 and the electrode tabs of the anode 150 stacked on the electrode assembly 100; Electrode assembly comprising a.
  16. 청구항 15에 있어서,The method according to claim 15,
    상기 전극탭뭉치는, The electrode tab bundle,
    상기 전극집합체(100)에 적층된 복수 개의 음극(110)에 형성된 음극탭(111)들끼리 적층되어 결합된 음극탭뭉치(111a) 및The negative electrode tabs 111a formed on the plurality of negative electrode 110 stacked on the electrode assembly 100 are stacked and coupled to each other.
    상기 전극집합체(100)에 적층된 복수 개의 양극(150)에 형성된 양극탭(151)들끼리 적층되어 결합된 양극탭뭉치(151a) 중 어느 하나 이상인 것을 특징으로 하는 전극조립체.Electrode assembly, characterized in that any one or more of the positive electrode tabs (151a) are laminated and bonded to the plurality of positive electrode tabs (151) formed on the plurality of positive electrodes (150) stacked on the electrode assembly (100).
  17. 청구항 15에 있어서,The method according to claim 15,
    상기 전극탭뭉치는,The electrode tab bundle,
    상기 전극집합체(100)에 적층된 복수 개의 음극(110)에 형성된 음극탭(111)을 상기 전극집합체(100)의 중심부 방향으로 벤딩하고 서로 결합한 음극탭뭉치(111a) 및The negative electrode tabs 111a formed by bending the negative electrode tabs 111 formed on the plurality of negative electrode 110 stacked on the electrode assembly 100 toward the center of the electrode assembly 100 and joined to each other;
    상기 전극집합체(100)에 적층된 복수 개의 양극(150)에 형성된 양극탭(151)들끼리 적층되어 결합된 양극탭뭉치(151a)를 포함하는 것을 특징으로 하는 전극조립체.Electrode assembly comprising a plurality of positive electrode tabs (151a) are laminated and bonded to the plurality of positive electrode tabs (151) formed on the plurality of positive electrodes (150) stacked on the electrode assembly (100).
  18. 청구항 17에 있어서,The method according to claim 17,
    상기 복수 개의 음극(110)에 형성된 음극탭(111)은 상기 전극집합체(100)를 권취한 상태에서 서로 등간격으로 이격된 것을 특징으로 하는 전극조립체.The cathode tabs 111 formed on the plurality of cathodes 110 are spaced apart at equal intervals from each other in a state in which the electrode assembly 100 is wound.
  19. 청구항 15에 있어서,The method according to claim 15,
    상기 전극집합체(100)에 적층된 복수 개의 상기 양극(150)의 전극탭은 동일 수직선 상에 위치하고, Electrode tabs of the plurality of positive electrodes 150 stacked on the electrode assembly 100 are positioned on the same vertical line,
    상기 전극집합체(100)에 적층된 상기 음극(110)의 전극탭은 복수 개의 상기 음극(110)의 적층 방향에 따라 상기 양극(150)의 전극탭으로부터의 이격 거리가 가까워지고,Electrode tabs of the negative electrode 110 stacked on the electrode assembly 100 have a close distance from the electrode tabs of the positive electrode 150 according to the stacking direction of the plurality of negative electrodes 110.
    상기 음극(110)의 전극탭은 단부가 상기 전극집합체(100)의 중심부에서 서로 겹쳐지도록 벤딩되어 있는 것을 특징으로 하는 전극조립체.The electrode tab of the cathode 110, the end is bent so as to overlap each other at the center of the electrode assembly 100, the electrode assembly.
  20. 청구항 19에 있어서,The method according to claim 19,
    상기 전극집합체(100)에서 동일 수직선 상에 적층된 복수 개의 상기 양극(150)의 전극탭끼리 적층되어 결합된 양극탭뭉치(151a)를 포함하는 것을 특징으로 하는 전극조립체.The electrode assembly of the electrode assembly 100, characterized in that it comprises a plurality of positive electrode tabs (151a) are laminated and bonded to the plurality of electrode tabs of the positive electrode (150) stacked on the same vertical line.
PCT/KR2017/012340 2016-11-02 2017-11-02 Electrode assembly and method for manufacturing same WO2018084606A1 (en)

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US16/067,449 US10700384B2 (en) 2016-11-02 2017-11-02 Electrode assembly and method for manufacturing the same
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KR101137372B1 (en) * 2009-09-18 2012-04-20 삼성에스디아이 주식회사 Method of manufacturing electrode assembly for rechargeable battery
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