WO2015047047A1 - Electrode having improved poor slanting movement, and secondary battery having same - Google Patents

Electrode having improved poor slanting movement, and secondary battery having same Download PDF

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Publication number
WO2015047047A1
WO2015047047A1 PCT/KR2014/009230 KR2014009230W WO2015047047A1 WO 2015047047 A1 WO2015047047 A1 WO 2015047047A1 KR 2014009230 W KR2014009230 W KR 2014009230W WO 2015047047 A1 WO2015047047 A1 WO 2015047047A1
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WO
WIPO (PCT)
Prior art keywords
electrode
current collector
electrode current
reinforcing material
end portion
Prior art date
Application number
PCT/KR2014/009230
Other languages
French (fr)
Korean (ko)
Inventor
김영수
이관수
류덕현
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US14/440,556 priority Critical patent/US9825301B2/en
Priority to CN201480002940.2A priority patent/CN104769751B/en
Priority to JP2015544020A priority patent/JP6191845B2/en
Priority claimed from KR1020140131877A external-priority patent/KR101645527B1/en
Publication of WO2015047047A1 publication Critical patent/WO2015047047A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 and a secondary battery including the improved meandering defect.
  • the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle that has been proposed as a solution for air pollution of existing gasoline and diesel vehicles using fossil fuel. It is also attracting attention as a power source such as Plug-In HEV.
  • the secondary battery is manufactured in a form in which the electrode assembly is embedded in the battery case together with the electrolyte.
  • the electrode assembly is classified into a stack type, a folding type, a stack-fold type, and a jelly roll type according to a manufacturing method.
  • the unit assembly has a structure in which the anode and the cathode are sequentially stacked with the separator interposed therebetween.
  • the jelly-roll type electrode assembly is manufactured by winding a separator between a sheet-type positive electrode and a negative electrode coated with an active material on a current collector through a separator, and it is necessary to first prepare a positive electrode and a negative electrode.
  • Unit electrodes such as a positive electrode and a negative electrode are manufactured through a predetermined process such as notching a series of electrode current collectors at unit electrode intervals, applying an electrode mixture, and applying a coating agent, and a process in which the electrode sheet is wound in the overall battery production process. This is often used repeatedly.
  • the 'sheet' is understood to refer to the current collector to which the active material is not applied or the current collector to which the active material is applied.
  • the tip portion of the electrode current collector which corresponds to the plain portion 2a where the electrode active material layer is not formed, referring to FIG. 1.
  • the end portion in the width direction W of the plain fabric portion 2a is first put into the (re) winding roll.
  • the positive electrode current collector 2 is generally made of aluminum foil, and a material having a weak tension, such as aluminum foil, may cause a problem in that the tip is curled during the (re) winding process.
  • the present invention has been made in view of the above-described problems, and is intended to solve the problem of meandering defects caused by curling of the tip end of the electrode current collector, and also to prevent internal short circuits due to meandering defects.
  • an electrode including an electrode current collector and an active material layer on at least one surface of the electrode current collector, an electrode to which a reinforcing material for reinforcing tension is applied to a distal end of the electrode current collector is provided.
  • the reinforcing material may be applied to the widthwise end of the tip portion of the electrode current collector.
  • the reinforcing material may be applied to both longitudinal ends of the electrode current collector front end portion.
  • the reinforcing material may be applied to both ends in the width direction and the length in the longitudinal direction of the tip of the electrode current collector.
  • the reinforcing material may be extended from the tip of the electrode current collector to a portion where the active material layer starts.
  • the reinforcing material may be applied to both sides of the electrode current collector front end portion.
  • the reinforcement may have a thickness of 10 to 100 ⁇ m.
  • the reinforcing material may have a thickness thinner than the active material layer.
  • the reinforcing material is polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-perfluoroalkyl vinyl ether air PFA, polyvinylidene fluoride (PVDF), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), acetate resin, polyimide, acetate, glass It can be formed from one or two or more mixtures selected from the group consisting of cloth tapes, polyesters, polyphenylenesulfides (PPS), polypropylene resins and SUS (steel use stainless).
  • PTFE polytetrafluoroethylene
  • FEP tetrafluoroethylene hexafluoropropylene copolymer
  • ETFE tetra
  • the electrode current collector may be formed from aluminum.
  • One reinforcing member may surround the widthwise end portion, the longitudinal both ends, or both of the electrode current collector tip portion.
  • a jelly-roll type electrode assembly comprising the electrode described above.
  • a battery pack comprising two or more of the secondary battery as a unit cell.
  • the battery pack may be used as a power source of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
  • a secondary battery comprising a jelly-roll type electrode assembly consisting of a positive electrode, a separator and a negative electrode
  • the width direction end portion of the electrode current collector front end portion and the width direction of the electrode current collector rear end portion Applying a reinforcing material over where the end is to be formed, and cutting the electrode current collector at unit cell intervals, whereby the front end width direction of one electrode current collector and the rear end width direction of the other electrode current collector are included.
  • a method of manufacturing a secondary battery such that a reinforcing material is applied to an end portion thereof.
  • the electrode can be wound in place without curling the electrode sheet in the manufacture of the jelly-roll type electrode assembly, and as a result, an internal short-circuit problem caused by poor meandering of the electrode sheet is solved. .
  • FIG 1 shows an embodiment before winding of an electrode according to the prior art.
  • Figure 2 shows an aspect before the winding of the electrode according to an aspect of the present invention.
  • FIG 3 shows an aspect before winding of an electrode according to another embodiment of the present invention.
  • Figure 4 shows an embodiment before the winding of the electrode according to another embodiment of the present invention.
  • FIG 5 shows an embodiment before winding of an electrode according to another embodiment of the present invention.
  • FIG. 6 illustrates an aspect in which a sheet of reinforcing material is applied to one surface of an electrode current collector front end portion as shown in FIG. 2 in accordance with an aspect of the present invention.
  • FIG. 7 illustrates an aspect in which two reinforcing materials are applied to both surfaces of an electrode current collector as shown in FIG. 2 according to another embodiment of the present invention.
  • FIG. 8 is a side view showing an aspect in which one reinforcing material is applied to both surfaces of an electrode current collector as shown in FIG. 2 according to another embodiment of the present invention.
  • Figure 1 shows a pre-winding aspect of the conventional electrode
  • Figures 2 to 4 illustrate the pre-winding aspect of the electrode according to an aspect of the present invention.
  • the active material layer 3 is formed in the center of the current collector 2.
  • non-coating portions may be formed on both sides of the active material layer 3 (see FIGS. 1 to 4).
  • the "uncoated part” is understood to refer to a region in which the active material layer is not formed in the electrode current collector.
  • the current collector 2 usable in the present invention may be a current collector generally used in the art. That is, the current collector may be formed of a material commonly used in the art, and may include a case in which the processing applied in the art is performed. For example, a porous current collector can be used. The effect of the present invention may be more pronounced when more anti-curling is required due to the material and / or thickness of the current collector. For example, the present invention can be preferably applied to an electrode in which an aluminum current collector is used.
  • the active material layer 3 may be formed by coating and drying an electrode mixture including an active material, a conductive material, and a binder commonly used in the art, and components and composition ratios of the active material layer are not particularly limited in the present invention. .
  • the conventional electrode 1 does not include a material or means for reinforcing the tension of the current collector 2. Therefore, when the electrode 1 manufactured by using a material having a weak tension as aluminum as the current collector is introduced into the winding device, the leading end of the electrode current collector 2 is curled.
  • the term 'tip' refers to an electrode winding start part in which an electrode is injected in a core direction.
  • the tip in FIG. 1 means a portion '2a'.
  • a reinforcement for reinforcing the electrode tip tension is applied to a predetermined position of the electrode, thereby improving the curling phenomenon and the meandering defect due to the tip end.
  • the term "reinforcing material” is understood to refer to any component that can be applied to a predetermined position of an electrode to suppress or prevent curling of the electrode sheet.
  • the term 'predetermined position of the electrode' is understood to mean any position of the electrode to which a reinforcing material is applied to improve the curling phenomenon and the meandering defect caused by the tip portion.
  • the reinforcing material 5a may be attached to the widthwise end portion W of the tip portion 2a of the electrode current collector 2.
  • the reinforcing material 5a may be applied to the tip portion 2a of the electrode current collector 2 by determining the width thereof so as not to disturb the effect of the electrode active material.
  • the width to which the reinforcing material 5a is applied extends to the beginning of the active material layer 3 or partially overlaps with the active material layer 3, the embodiment shown in FIG.
  • the reinforcing material 5a is applied to the longitudinal end L of the tip portion 2a of the electrode current collector 2 (see FIG. 3), or of the electrode current collector 2. It can be applied over the longitudinal end L and the widthwise end W of the tip 2a (see FIG. 4).
  • the reinforcing material 5a is applied to the tip portion 2a of the electrode current collector 2 to thereby reinforce the tension of the electrode current collector 2. As a result, even when the electrode 1 is introduced into the winding apparatus, the winding can be performed without curling phenomenon.
  • the reinforcing material 5a should provide tension reinforcement such that the tip portion 2 of the electrode current collector 2 is not easily curled, and should not form a significant step in the positive electrode current collector.
  • the reinforcing material may have a thickness of 10 to 100 ⁇ m, and in particular, it is preferable to have a thickness equal to or thinner than the active material layer.
  • the reinforcing material that can be used in the present invention is not particularly limited as long as it is formed of a material that exhibits high stability with respect to electrolyte or lithium ions, and has high electrical insulation and thermal stability.
  • Non-limiting examples of reinforcing materials include polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-perfluoro Fluorine resins such as alkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), acetate Resin polyimide, acetate, glass cloth tape, polyester, polyphenylenesulfide (PPS) resin, and polypropylene resin may be formed of one or more selected from the group consisting of an electrode in the form of insulating tape It can be applied to a predetermined position of the current collector.
  • a metal such as steel
  • the reinforcing material may be attached to the electrode current collector by an adhesive applied to one surface of the reinforcing material.
  • the electrode may be attached to the electrode current collector by a thermal fusion method.
  • the reinforcement may be present only at the front end of the electrode current collector 2, but may also be present at the rear end of the electrode current collector 2 in some cases. For example, by a process including applying a reinforcing material over the width direction end portion of the electrode current collector front end portion and the width direction end portion of the electrode current collector rear end portion, and cutting the electrode current collector at unit cell intervals.
  • the reinforcing material may be applied to the front end portion widthwise end portion of one electrode current collector and the rear end portion width direction end portion of the other electrode current collector.
  • FIG. 2 One such aspect is illustrated in FIG. 2. Referring to FIG. 2, not only the reinforcement 5a exists at the front end of the electrode current collector, but also the reinforcement 5b exists at the rear end.
  • the reinforcing material (5a) is extended from the tip of the positive electrode to the boundary between the positive electrode uncoated portion and the active material layer to ensure electrical insulation and improve safety.
  • the reinforcing material can be extended to cover the interface between the electrode current collector 2 and the active material layer 3, thereby eliminating the need to separately attach an insulating tape to the interface between the electrode current collector and the active material layer.
  • the length of the reinforcing material 5a is extended so as not to adversely affect the working effect of the active material layer.
  • one sheet of reinforcing material 5a may be applied to one surface of the front end portion (see FIG. 6), but a reinforcing material may be applied to both surfaces of the electrode current collector.
  • two sheets of reinforcing materials 5a and 5a ' may be formed to be laminated on both sides of the electrode current collector (see FIG. 7), or one sheet of reinforcing material 5a may be applied to surround the front ends of both sides of the electrode current collector. (See FIG. 8). That is, one sheet of reinforcing material may surround the widthwise end portion, the longitudinal end portion, or both of both ends of the electrode current collector front end portion.
  • the present invention also provides a secondary battery in which the electrode assembly is sealed inside the battery case together with the electrolyte solution.
  • the secondary battery may preferably be a lithium secondary battery having high energy density, discharge voltage, and output stability.
  • Other components of the lithium secondary battery according to the present invention will be described in detail below.
  • a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, a lithium salt-containing nonaqueous electrolyte, and the like.
  • the positive electrode is produced by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder onto a positive electrode current collector, followed by drying, and further, a filler may be further added as necessary.
  • the negative electrode is also manufactured by applying and drying a negative electrode material on the negative electrode current collector, and if necessary, the components as described above may be further included.
  • the separator is interposed between the cathode and the anode, and an insulating thin film having high ion permeability and mechanical strength is used.
  • the lithium salt-containing non-aqueous electrolyte solution consists of a nonaqueous electrolyte solution and a lithium salt, and a liquid nonaqueous electrolyte solution, a solid electrolyte, an inorganic solid electrolyte, and the like are used as the nonaqueous electrolyte solution.
  • the current collector the electrode active material, the conductive material, the binder, the filler, the separator, the electrolyte, the lithium salt, and the like are known in the art, a detailed description thereof will be omitted herein.
  • the lithium secondary battery according to the present invention can be produced by conventional methods known in the art. That is, it may be prepared by inserting a porous separator between the anode and the cathode and injecting the electrolyte therein.
  • the positive electrode may be manufactured by, for example, applying a slurry containing the lithium transition metal oxide active material, a conductive material, and a binder as described above onto a current collector and then drying.
  • the negative electrode can be prepared by, for example, applying a slurry containing the above-described carbon active material, a conductive material and a binder onto a thin current collector and then drying it.
  • the present invention also provides a battery pack including two or more of the secondary battery as a unit cell.
  • the battery pack according to the present invention has a limited mounting space in consideration of mounting efficiency, structural stability, etc. and is a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device exposed to frequent vibrations and strong impacts. Can be preferably used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The present invention relates to a secondary battery in which a reinforcement material is applied to a distal end of an electrode current collector used in a jelly-roll type electrode assembly, thereby improving poor slanting movement. When the jelly-roll type electrode assembly is manufactured, the distal end of the electrode current collector is wound around a regular position without being curled, thereby solving an internal short-circuit problem which is generated by the poor slanting movement.

Description

사행불량이 개선된 전극 및 이를 포함하는 이차전지Electrode with improved meandering defect and secondary battery comprising the same
본 출원은 2013년 9월 30일에 출원된 한국특허출원 제10-2013-0116939호 및 2014년 9월 30일에 출원된 한국특허출원 제10-2014-0131877호에 기초한 우선권을 주장하며, 해당 출원의 명세서 및 도면에 개시된 모든 내용은 본 출원에 원용된다.This application claims the priority based on Korea Patent Application No. 10-2013-0116939 filed on September 30, 2013 and Korea Patent Application No. 10-2014-0131877 filed on September 30, 2014, All content disclosed in the specification and drawings of an application is incorporated in this application.
본 발명은 사행불량이 개선된 전극 및 이를 포함하는 이차전지에 관한 것이다.The present invention relates to an electrode and a secondary battery including the improved meandering defect.
최근, 충방전이 가능한 이차전지는 와이어리스 모바일 기기의 에너지원 또는 보조 전력장치 등으로 광범위하게 사용되고 있다. 또한, 이차전지는 화석 연료를 사용하는 기존의 가솔린 차량, 디젤 차량 등의 대기오염 등을 해결하기 위한 방안으로 제시되고 있는 전기자동차(EV), 하이브리드 전기자동차(HEV), 플러그-인 하이브리드 전기자동차(Plug-In HEV) 등의 동력원으로도 주목받고 있다. 이러한 이차전지는 전극조립체가 전해액과 함께 전지케이스에 내장되는 형태로 제조된다.Recently, secondary batteries capable of charging and discharging have been widely used as energy sources or auxiliary power devices of wireless mobile devices. In addition, the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle that has been proposed as a solution for air pollution of existing gasoline and diesel vehicles using fossil fuel. It is also attracting attention as a power source such as Plug-In HEV. The secondary battery is manufactured in a form in which the electrode assembly is embedded in the battery case together with the electrolyte.
전극조립체는 제조 방법에 따라 스택형, 폴딩형, 스택-폴딩형 및 젤리-롤형 등으로 구분된다. 스택형 또는 스택-폴딩형 전극조립체의 경우, 단위 조립체가 양극과 음극이 분리막을 사이에 두고 순차적으로 적층되는 구조로 이루어져 있다. The electrode assembly is classified into a stack type, a folding type, a stack-fold type, and a jelly roll type according to a manufacturing method. In the case of the stacked or stack-folded electrode assembly, the unit assembly has a structure in which the anode and the cathode are sequentially stacked with the separator interposed therebetween.
이에 반해, 젤리-롤형 전극조립체는 활물질이 집전체에 도포된 시트형의 양극과 음극 사이에 분리막을 개재하여 권취하여 제조되는데, 양극과 음극을 먼저 제조하는 것이 필요하다. 양극과 음극 같은 단위 전극은 일련의 전극 집전체를 단위 전극 간격으로 노칭, 전극합제 도포, 코팅제 도포 등과 같은 소정의 공정을 거쳐서 제조되며, 이러한 전체적인 전지 생산 과정에서 전극 시트가 (리)와인딩되는 공정이 반복적으로 자주 사용된다. 본원 명세서에서 '시트'는 활물질이 도포되지 않은 집전체 또는 활물질이 도포된 집전체를 총칭하여 일컫는 것으로 이해한다. 이 때, 전극에서 (리)와인딩 롤로 투입되기 시작하는 부분은 전극 집전체의 선단부로서, 이는, 도 1을 참조할 때, 전극 활물질층이 형성되어 있지 않은 무지부(2a)에 해당하며, 보다 구체적으로는 무지부(2a) 중 폭방향(W) 단부 부분이 (리)와인딩 롤에 가장 먼저 투입되게 된다. 특히, 양극 집전체(2)는 일반적으로 알루미늄 호일로 제조되는데, 알루미늄 호일과 같이 장력이 약한 소재는 (리)와인딩 공정시에 선단부가 컬링(curling, 말림)되는 문제를 발생시킬 수 있다. 이와 같이 전극의 선단부가 컬링되면 사행불량을 일으키게 되고, 전극조립체는 정위치에서 라미네이션되지 못하게 되어 양극 무지부가 음극 활물질에 접촉하거나, 음극 무지부가 양극 활물질에 접촉하거나, 양극 무지부와 음극 무지부가 접촉하게 되는 등의 이유로 인해 내부 쇼트가 일어날 수 있다.In contrast, the jelly-roll type electrode assembly is manufactured by winding a separator between a sheet-type positive electrode and a negative electrode coated with an active material on a current collector through a separator, and it is necessary to first prepare a positive electrode and a negative electrode. Unit electrodes such as a positive electrode and a negative electrode are manufactured through a predetermined process such as notching a series of electrode current collectors at unit electrode intervals, applying an electrode mixture, and applying a coating agent, and a process in which the electrode sheet is wound in the overall battery production process. This is often used repeatedly. In the present specification, the 'sheet' is understood to refer to the current collector to which the active material is not applied or the current collector to which the active material is applied. At this time, a portion of the electrode starting to be introduced into the (ri) winding roll is the tip portion of the electrode current collector, which corresponds to the plain portion 2a where the electrode active material layer is not formed, referring to FIG. 1. Specifically, the end portion in the width direction W of the plain fabric portion 2a is first put into the (re) winding roll. In particular, the positive electrode current collector 2 is generally made of aluminum foil, and a material having a weak tension, such as aluminum foil, may cause a problem in that the tip is curled during the (re) winding process. When the tip of the electrode is curled as described above, a meandering defect is caused, and the electrode assembly cannot be laminated in the right position so that the positive electrode is in contact with the negative electrode active material, the negative electrode is in contact with the positive electrode active material, or the positive electrode is in contact with the negative electrode is uncoated. Internal short-circuits can occur, for example, for example.
본 발명은 전술한 문제점에 착안하여 이루어진 것으로, 전극집전체의 선단부 컬링으로 인해 발생하였던 사행 불량의 문제점을 해소하고, 또한, 사행 불량으로 인한 내부 쇼트도 방지하고자 한다. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and is intended to solve the problem of meandering defects caused by curling of the tip end of the electrode current collector, and also to prevent internal short circuits due to meandering defects.
본 발명의 일 양태에 의하면, 전극 집전체 및 상기 전극 집전체의 적어도 일면에 활물질층을 포함하는 전극에 있어서, 전극 집전체의 선단부에 장력을 보강하기 위한 보강재가 적용되어 있는 전극이 제공된다.According to one aspect of the present invention, in an electrode including an electrode current collector and an active material layer on at least one surface of the electrode current collector, an electrode to which a reinforcing material for reinforcing tension is applied to a distal end of the electrode current collector is provided.
상기 보강재는 전극 집전체 선단부의 폭방향 단부에 적용될 수 있다.The reinforcing material may be applied to the widthwise end of the tip portion of the electrode current collector.
상기 보강재는 전극 집전체 선단부의 길이방향 양 단부에 적용될 수 있다.The reinforcing material may be applied to both longitudinal ends of the electrode current collector front end portion.
상기 보강재는 전극 집전체 선단부의 폭방향 단부와 길이방향 양 단부에 적용될 수 있다.The reinforcing material may be applied to both ends in the width direction and the length in the longitudinal direction of the tip of the electrode current collector.
상기 보강재는 전극 집전체 선단부로부터 활물질층이 시작되는 부분에까지 연장되어 적용될 수 있다.The reinforcing material may be extended from the tip of the electrode current collector to a portion where the active material layer starts.
상기 보강재는 전극 집전체 선단부의 양면에 적용될 수 있다.The reinforcing material may be applied to both sides of the electrode current collector front end portion.
상기 보강재는 10 내지 100 ㎛의 두께를 가질 수 있다.The reinforcement may have a thickness of 10 to 100 ㎛.
상기 보강재는 활물질층보다 얇은 두께를 가질 수 있다.The reinforcing material may have a thickness thinner than the active material layer.
상기 보강재는 폴리테트라플루오로에틸렌(PTFE)，테트라플루오로에틸렌 헥사플루오로프로필렌 공중합체(FEP)，테트라플루오로에틸렌-에틸렌 공중합체(ETFE)，테트라플루오로에틸렌-퍼플루오로알킬비닐에테르 공중합체(PFA)，폴리불화 비닐리덴(PVDF)，폴리부틸렌 테레프탈레이트(PBT)，폴리에틸렌 테레프탈레이트(PET), 폴리에틸렌(PE)，폴리염화비닐(PVC)，아세테이트 수지, 폴리이미드, 아세테이트, glass cloth 테이프, 폴리에스테르, 폴리페닐렌설파이드(Polyphenylenesulfide, PPS), 폴리프로필렌(polypropylene) 수지 및 SUS (steel use stainless)로 이루어진 군으로부터 선택된 1종 또는 2종 이상의 혼합체로부터 형성될 수 있다.The reinforcing material is polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-perfluoroalkyl vinyl ether air PFA, polyvinylidene fluoride (PVDF), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), acetate resin, polyimide, acetate, glass It can be formed from one or two or more mixtures selected from the group consisting of cloth tapes, polyesters, polyphenylenesulfides (PPS), polypropylene resins and SUS (steel use stainless).
상기 전극 집전체는 알루미늄으로부터 형성될 수 있다.The electrode current collector may be formed from aluminum.
전극 집전체 선단부의 폭방향 단부, 길이방향 양 단부 또는 이들 둘다를 보강재 1매가 둘러싸고 있을 수 있다.One reinforcing member may surround the widthwise end portion, the longitudinal both ends, or both of the electrode current collector tip portion.
본 발명의 다른 양태에 따르면, 전술한 전극을 포함하는 젤리-롤형 전극조립체가 제공된다.According to another aspect of the present invention, there is provided a jelly-roll type electrode assembly comprising the electrode described above.
또한, 본 발명의 다른 양태에 따르면, 상기 젤리-롤형 전극조립체가 전지케이스의 내부에 밀봉되어 있는 이차전지가 제공된다.In addition, according to another aspect of the present invention, there is provided a secondary battery in which the jelly-roll type electrode assembly is sealed inside the battery case.
본 발명의 다른 양태에 따르면, 상기 이차전지를 단위전지로서 둘 또는 그 이상 포함하는 것을 특징으로 하는 전지팩이 제공된다.According to another aspect of the present invention, there is provided a battery pack comprising two or more of the secondary battery as a unit cell.
상기 전지팩은 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 또는 전력 저장장치의 전원으로 사용될 수 있다.The battery pack may be used as a power source of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
또한, 본 발명의 또 다른 양태에 따르면, 양극, 분리막 및 음극으로 이루어진 젤리-롤형 전극조립체를 포함하는 이차전지의 제조 방법에 있어서, 전극 집전체 선단부의 폭방향 단부와 전극 집전체 후단부의 폭방향 단부가 형성될 곳에 걸쳐 보강재를 적용하는 단계, 및 상기 전극 집전체를 단위 전지 간격으로 절단하는 단계를 포함하고, 이로써 하나의 전극 집전체의 선단부 폭방향 단부 및 다른 전극 집전체의 후단부 폭방향 단부에 보강재가 적용되도록 하는 이차전지의 제조방법이 제공된다.Further, according to another aspect of the present invention, in the method of manufacturing a secondary battery comprising a jelly-roll type electrode assembly consisting of a positive electrode, a separator and a negative electrode, the width direction end portion of the electrode current collector front end portion and the width direction of the electrode current collector rear end portion Applying a reinforcing material over where the end is to be formed, and cutting the electrode current collector at unit cell intervals, whereby the front end width direction of one electrode current collector and the rear end width direction of the other electrode current collector are included. Provided is a method of manufacturing a secondary battery such that a reinforcing material is applied to an end portion thereof.
본 발명에 의하면 젤리-롤형 전극조립체의 제조시 전극 시트의 컬링없이 전극이 정위치에 권취될 수 있으며, 그 결과, 전극 시트의 사행 불량으로 인해 발생하였던 내부 쇼트(short-circuit) 문제점이 해결된다.According to the present invention, the electrode can be wound in place without curling the electrode sheet in the manufacture of the jelly-roll type electrode assembly, and as a result, an internal short-circuit problem caused by poor meandering of the electrode sheet is solved. .
도 1은 종래 기술에 따른 전극의 권취전 양태를 나타낸 것이다.1 shows an embodiment before winding of an electrode according to the prior art.
도 2는 본 발명의 일 양태에 따른 전극의 권취전 양태를 나타낸 것이다.Figure 2 shows an aspect before the winding of the electrode according to an aspect of the present invention.
도 3은 본 발명의 다른 양태에 따른 전극의 권취전 양태를 나타낸 것이다.3 shows an aspect before winding of an electrode according to another embodiment of the present invention.
도 4는 본 발명의 다른 양태에 따른 전극의 권취전 양태를 나타낸 것이다.Figure 4 shows an embodiment before the winding of the electrode according to another embodiment of the present invention.
도 5는 본 발명의 다른 양태에 따른 전극의 권취전 양태를 나타낸 것이다.5 shows an embodiment before winding of an electrode according to another embodiment of the present invention.
도 6은 본 발명의 일 양태에 따라 1매(sheet)의 보강재가 전극 집전체 선단부의 일면에 도 2에 도시된 바와 같이 적용된 양태를 측면에서 나타낸 것이다.FIG. 6 illustrates an aspect in which a sheet of reinforcing material is applied to one surface of an electrode current collector front end portion as shown in FIG. 2 in accordance with an aspect of the present invention.
도 7은 본 발명의 다른 양태에 따라 2매의 보강재가 전극 집전체의 양면에 도 2에 도시된 바와 같이 적용된 양태를 측면에서 나타낸 것이다. FIG. 7 illustrates an aspect in which two reinforcing materials are applied to both surfaces of an electrode current collector as shown in FIG. 2 according to another embodiment of the present invention.
도 8은 본 발명의 다른 양태에 따라 1매의 보강재가 전극 집전체의 양면에 도 2에 도시된 바와 같이 적용된 양태를 측면에서 나타낸 것이다.8 is a side view showing an aspect in which one reinforcing material is applied to both surfaces of an electrode current collector as shown in FIG. 2 according to another embodiment of the present invention.
이하, 본 발명에 대하여 상세히 설명하기로 한다. 이에 앞서, 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 도면에 기재된 구성은 본 발명의 가장 바람직한 일 실시예에 불과할 뿐이고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.Hereinafter, the present invention will be described in detail. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the configuration described in the drawings described herein is only one of the most preferred embodiment of the present invention and does not represent all of the technical idea of the present invention, various equivalents and modifications that can replace them at the time of the present application It should be understood that there may be examples.
도 1은 종래 전극의 권취전 양태를 나타낸 것이고, 도 2 내지 4는 본 발명의 일 양태에 따른 전극의 권취전 양태를 예시한 것이다.Figure 1 shows a pre-winding aspect of the conventional electrode, Figures 2 to 4 illustrate the pre-winding aspect of the electrode according to an aspect of the present invention.
도 1 내지 도 5를 참조하면, 집전체(2)의 중심에 활물질층(3)이 형성되어 있다. 또한, 활물질층(3)의 양측에 무지부가 형성되어 있을 수 있다(도 1 내지 4 참조). 본원 명세서에서, '무지부'라 함은 전극 집전체 중 활물질층이 형성되어 있지 않은 영역을 지칭하는 것으로 이해한다.1 to 5, the active material layer 3 is formed in the center of the current collector 2. In addition, non-coating portions may be formed on both sides of the active material layer 3 (see FIGS. 1 to 4). In the present specification, the "uncoated part" is understood to refer to a region in which the active material layer is not formed in the electrode current collector.
본 발명에서 사용가능한 집전체(2)는 당업계에서 일반적으로 사용되는 집전체일 수 있다. 즉, 집전체는 당업계에서 통상적으로 사용되는 재질로 형성될 수 있으며, 당업계에서 가해지는 가공이 이루어지는 경우도 포함될 수 있다. 예컨대, 다공질 집전체가 사용될 수 있다. 집전체의 소재 및/또는 두께로 인해 컬링 방지가 더 요구되는 경우에 본 발명의 효과가 더욱 현저해질 수 있다. 예컨대, 알루미늄 집전체가 사용되는 전극에 본 발명이 바람직하게 적용될 수 있다. The current collector 2 usable in the present invention may be a current collector generally used in the art. That is, the current collector may be formed of a material commonly used in the art, and may include a case in which the processing applied in the art is performed. For example, a porous current collector can be used. The effect of the present invention may be more pronounced when more anti-curling is required due to the material and / or thickness of the current collector. For example, the present invention can be preferably applied to an electrode in which an aluminum current collector is used.
활물질층(3)은 당업계에서 통상적으로 사용되는 활물질, 도전재 및 바인더를 포함하는 전극 합제를 코팅, 건조하여 형성할 수 있으며, 활물질층을 구성하는 성분 및 조성비는 본 발명에서 특별히 제한되지 않는다. The active material layer 3 may be formed by coating and drying an electrode mixture including an active material, a conductive material, and a binder commonly used in the art, and components and composition ratios of the active material layer are not particularly limited in the present invention. .
도 1을 참조하면, 종래의 전극(1)은 집전체(2)의 장력을 보강하기 위한 물질이나 수단을 포함하고 있지 않다. 따라서, 알루미늄과 같이 장력이 약한 소재를 집전체로 사용하여 제조된 전극(1)이 권취 장치로 투입될 때에 전극 집전체(2)의 선단부가 컬링되는(curled) 현상이 발생하였다. 본원 명세서에서 '선단부'라 함은 전극이 코어 방향으로 투입되는 전극 권취 시작부를 의미한다. 예컨대, 도 1에서 선단부라 함은 '2a' 부분을 의미한다.Referring to FIG. 1, the conventional electrode 1 does not include a material or means for reinforcing the tension of the current collector 2. Therefore, when the electrode 1 manufactured by using a material having a weak tension as aluminum as the current collector is introduced into the winding device, the leading end of the electrode current collector 2 is curled. In the present specification, the term 'tip' refers to an electrode winding start part in which an electrode is injected in a core direction. For example, the tip in FIG. 1 means a portion '2a'.
본 발명에서는 전극의 소정의 위치에, 전극 선단부 장력을 보강하기 위한 보강재가 적용되어, 선단부의 컬링 현상 및 이로 인한 사행불량을 개선하는 특징을 갖는다.In the present invention, a reinforcement for reinforcing the electrode tip tension is applied to a predetermined position of the electrode, thereby improving the curling phenomenon and the meandering defect due to the tip end.
본원 명세서에서 '보강재'라 함은 전극의 소정의 위치에 적용되어, 전극 시트의 컬링 현상을 억제 혹은 방지할 수 있는 임의의 구성요소를 지칭하는 것으로 이해한다.As used herein, the term "reinforcing material" is understood to refer to any component that can be applied to a predetermined position of an electrode to suppress or prevent curling of the electrode sheet.
본원 명세서에서 '전극의 소정의 위치'라 함은 보강재가 적용되어 선단부의 컬링 현상 및 이로 인한 사행불량을 개선시킬 수 있는 전극의 임의의 위치를 의미하는 것으로 이해한다.In the present specification, the term 'predetermined position of the electrode' is understood to mean any position of the electrode to which a reinforcing material is applied to improve the curling phenomenon and the meandering defect caused by the tip portion.
예컨대, 본 발명의 일 양태를 나타내는 도 2를 참조하면, 전극 집전체(2)의 선단부(2a)의 폭방향 단부(W)에 보강재(5a)가 부착될 수 있다. 보강재(5a)는 전극 활물질의 작용 효과를 방해하지 않도록 그 폭을 결정하여 전극 집전체(2)의 선단부(2a)에 적용될 수 있다. 보강재(5a)가 적용되는 폭을 활물질 층(3)이 시작되는 부분까지 혹은 활물질 층(3)과 일부 중복되도록 연장할 경우, 도 5에 제시된 양태가 된다.For example, referring to FIG. 2 showing an aspect of the present invention, the reinforcing material 5a may be attached to the widthwise end portion W of the tip portion 2a of the electrode current collector 2. The reinforcing material 5a may be applied to the tip portion 2a of the electrode current collector 2 by determining the width thereof so as not to disturb the effect of the electrode active material. When the width to which the reinforcing material 5a is applied extends to the beginning of the active material layer 3 or partially overlaps with the active material layer 3, the embodiment shown in FIG.
또는, 본 발명의 다른 양태를 살펴보면, 보강재(5a)는 전극 집전체(2)의 선단부(2a)의 길이방향 단부(L)에 적용되거나(도 3 참조), 또는 전극 집전체(2)의 선단부(2a)의 길이방향 단부(L) 및 폭방향 단부(W)에 걸쳐 적용될 수 있다(도 4 참조).Alternatively, referring to another aspect of the present invention, the reinforcing material 5a is applied to the longitudinal end L of the tip portion 2a of the electrode current collector 2 (see FIG. 3), or of the electrode current collector 2. It can be applied over the longitudinal end L and the widthwise end W of the tip 2a (see FIG. 4).
전술한 바와 같이 보강재(5a)가 전극 집전체(2)의 선단부(2a)에 적용됨으로써 전극 집전체(2)의 장력이 보강된다. 그 결과, 전극(1)이 권취 장치로 투입될 때에도 컬링 현상없이 권취가 가능하게 된다. 상기 보강재(5a)는 전극 집전체(2)의 선단부(2)가 쉽게 컬링되지 않을 정도의 장력보강을 제공하는 동시에 양극 집전체에서 유의한 단차를 형성하지 않아야 한다.As described above, the reinforcing material 5a is applied to the tip portion 2a of the electrode current collector 2 to thereby reinforce the tension of the electrode current collector 2. As a result, even when the electrode 1 is introduced into the winding apparatus, the winding can be performed without curling phenomenon. The reinforcing material 5a should provide tension reinforcement such that the tip portion 2 of the electrode current collector 2 is not easily curled, and should not form a significant step in the positive electrode current collector.
보강재는 10 내지 100 ㎛의 두께를 가질 수 있으며, 특히, 활물질층과 같거나 이보다 얇은 두께를 갖는 것이 바람직하다.The reinforcing material may have a thickness of 10 to 100 μm, and in particular, it is preferable to have a thickness equal to or thinner than the active material layer.
본 발명에서 사용될 수 있는 보강재는 전해액이나 리튬 이온에 대하여 높은 안정성을 나타내고 전기적 절연성이 높고 열 안정성이 있는 물질로서 집전체의 장력을 보강할 수 있는 물질로 형성된 것이라면 특별히 제한되지 않는다. The reinforcing material that can be used in the present invention is not particularly limited as long as it is formed of a material that exhibits high stability with respect to electrolyte or lithium ions, and has high electrical insulation and thermal stability.
보강재의 비제한적인 예로는 폴리테트라플루오로에틸렌(PTFE)，테트라플루오로에틸렌 헥사플루오로프로필렌 공중합체(FEP)，테트라플루오로에틸렌-에틸렌 공중합체(ETFE)，테트라플루오로에틸렌-퍼플루오로알킬비닐에테르 공중합체(PFA)，폴리불화 비닐리덴(PVDF) 등의 불소 수지，폴리부틸렌 테레프탈레이트(PBT)，폴리에틸렌 테레프탈레이트(PET), 폴리에틸렌(PE)，폴리염화비닐(PVC)，아세테이트 수지 폴리이미드, 아세테이트, glass cloth 테이프, 폴리에스테르, 폴리페닐렌설파이드(Polyphenylenesulfide, PPS) 수지, 및 폴리프로필렌(polypropylene) 수지로 이루어진 군으로부터 선택된 1종 이상으로 이루어질 수 있으며, 이들은 절연 테이프 형태로 전극 집전체의 소정의 위치에 적용될 수 있다. 보강재의 또 다른 비제한적인 예로는 장력을 보다 보강시키기 위해 SUS(steel use stainless)와 같은 금속을 필름 형태로 전극 집전체의 소정의 위치에 적용시키는 양태를 들 수 있다.Non-limiting examples of reinforcing materials include polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-perfluoro Fluorine resins such as alkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), acetate Resin polyimide, acetate, glass cloth tape, polyester, polyphenylenesulfide (PPS) resin, and polypropylene resin may be formed of one or more selected from the group consisting of an electrode in the form of insulating tape It can be applied to a predetermined position of the current collector. Another non-limiting example of the reinforcing material is an aspect in which a metal such as steel use stainless (SUS) is applied to a predetermined position of the electrode current collector in the form of a film to further reinforce the tension.
상기 보강재는 보강재 일면에 적용되어 있는 접착제에 의해 전극 집전체에 부착될 수 있다. 혹은, 경우에 따라서는, 열융착 방법에 의해 전극 집전체에 부착될 수 있다. The reinforcing material may be attached to the electrode current collector by an adhesive applied to one surface of the reinforcing material. Alternatively, in some cases, the electrode may be attached to the electrode current collector by a thermal fusion method.
상기 보강재는 전극 집전체(2)의 선단부에만 존재할 수도 있으나, 경우에 따라서는 전극 집전체(2)의 후단부에도 존재할 수 있다. 일례로, 전극 집전체 선단부의 폭방향 단부와 전극 집전체 후단부의 폭방향 단부를 형성할 곳에 걸쳐 보강재를 적용하는 단계, 및 상기 전극 집전체를 단위 전지 간격으로 절단하는 단계를 포함하는 공정에 의해, 하나의 전극 집전체의 선단부 폭방향 단부 및 다른 전극 집전체의 후단부 폭방향 단부에 보강재가 적용되도록 할 수 있다.The reinforcement may be present only at the front end of the electrode current collector 2, but may also be present at the rear end of the electrode current collector 2 in some cases. For example, by a process including applying a reinforcing material over the width direction end portion of the electrode current collector front end portion and the width direction end portion of the electrode current collector rear end portion, and cutting the electrode current collector at unit cell intervals. The reinforcing material may be applied to the front end portion widthwise end portion of one electrode current collector and the rear end portion width direction end portion of the other electrode current collector.
이러한 일 양태가 도 2에 예시되어 있는데, 도 2를 참조하면, 전극 집전체의 선단부에 보강재(5a)가 존재할 뿐 아니라, 후단부에도 보강재(5b)가 존재한다.One such aspect is illustrated in FIG. 2. Referring to FIG. 2, not only the reinforcement 5a exists at the front end of the electrode current collector, but also the reinforcement 5b exists at the rear end.
도 5를 참조하여 본 발명의 다른 양태를 살펴보면, 양극 선단부로부터, 양극 무지부와 활물질층의 경계부까지 보강재(5a)가 연장되어 전기절연성을 확보하고 안전성을 향상시킬 수 있다. 이 경우, 상기 보강재는 전극 집전체(2)와 활물질 층(3)의 경계면을 피복하도록 연장될 수 있어서, 전극 집전체와 활물질 층의 경계면에 별도로 절연 테이프를 부착시킬 필요가 없어지게 된다. 이 때, 상기 보강재(5a)가 연장되는 길이는 활물질층의 작용 효과에 악영향을 주지 않도록 결정한다.Looking at another embodiment of the present invention with reference to Figure 5, the reinforcing material (5a) is extended from the tip of the positive electrode to the boundary between the positive electrode uncoated portion and the active material layer to ensure electrical insulation and improve safety. In this case, the reinforcing material can be extended to cover the interface between the electrode current collector 2 and the active material layer 3, thereby eliminating the need to separately attach an insulating tape to the interface between the electrode current collector and the active material layer. At this time, the length of the reinforcing material 5a is extended so as not to adversely affect the working effect of the active material layer.
또한, 본 발명의 일 양태에서, 선단부의 일면에 보강재 1매(5a)가 적용될 수 있을 뿐만 아니라(도 6 참조), 전극 집전체의 양면에 보강재가 적용될 수 있다. 이 경우, 2매의 보강재(5a, 5a')가 전극 집전체의 양면에 라미네이션 접착되도록 형성되거나(도 7 참조) 혹은 1매의 보강재(5a)가 전극 집전체 양면의 선단부를 감싸도록 적용될 수 있다(도 8 참조). 즉, 보강재 1매가 전극 집전체 선단부 양면의 폭방향 단부, 길이방향 단부 또는 이들 둘다를 둘러쌀 수 있다. 1매의 보강재가 전극 집전체의 선단부를 감싸도록 적용되는 경우에는 보강재와 전극 집전체간의 탈라미네이션(delamination)이 발생하지 않는 이점을 가질 수 있다.In addition, in one aspect of the present invention, not only one sheet of reinforcing material 5a may be applied to one surface of the front end portion (see FIG. 6), but a reinforcing material may be applied to both surfaces of the electrode current collector. In this case, two sheets of reinforcing materials 5a and 5a 'may be formed to be laminated on both sides of the electrode current collector (see FIG. 7), or one sheet of reinforcing material 5a may be applied to surround the front ends of both sides of the electrode current collector. (See FIG. 8). That is, one sheet of reinforcing material may surround the widthwise end portion, the longitudinal end portion, or both of both ends of the electrode current collector front end portion. When one reinforcing material is applied to surround the tip of the electrode current collector, it may have an advantage that no delamination occurs between the reinforcing material and the electrode current collector.
이러한 보강재의 적용 양태는 도 2에 제시된 양태뿐만 아니라, 도 3 내지 5에 제시된 양태에도 적용될 수 있다.The application aspect of such a reinforcement may be applied to the embodiment shown in FIGS. 3 to 5 as well as the embodiment shown in FIG. 2.
본 발명은 또한, 상기 전극조립체가 전해액과 함께 전지케이스의 내부에 밀봉되어 있는 이차전지를 제공한다.The present invention also provides a secondary battery in which the electrode assembly is sealed inside the battery case together with the electrolyte solution.
상기 이차전지는 바람직하게는 높은 에너지 밀도, 방전 전압, 및 출력 안정성의 리튬 이차전지일 수 있다. 본 발명에 따른 리튬 이차전지의 기타 구성 요소들에 대하여 이하에서 상세히 설명한다. The secondary battery may preferably be a lithium secondary battery having high energy density, discharge voltage, and output stability. Other components of the lithium secondary battery according to the present invention will be described in detail below.
일반적으로 리튬 이차전지는 양극, 음극, 분리막, 리튬염 함유 비수 전해액 등으로 구성되어 있다.In general, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, a lithium salt-containing nonaqueous electrolyte, and the like.
양극은, 예를 들어, 양극 집전체 상에 양극 활물질, 도전재 및 바인더의 혼합물을 도포한 후 건조하여 제조되며, 필요에 따라서는, 충진제를 더 첨가하기도 한다. 음극은 또한 음극 집전체 상에 음극 재료를 도포, 건조하여 제작되며, 필요에 따라, 앞서 설명한 바와 같은 성분들이 더 포함될 수도 있다. The positive electrode is produced by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder onto a positive electrode current collector, followed by drying, and further, a filler may be further added as necessary. The negative electrode is also manufactured by applying and drying a negative electrode material on the negative electrode current collector, and if necessary, the components as described above may be further included.
상기 분리막은 음극과 양극 사이에 개재되며, 높은 이온 투과도와 기계적 강도를 가지는 절연성의 얇은 박막이 사용된다. The separator is interposed between the cathode and the anode, and an insulating thin film having high ion permeability and mechanical strength is used.
리튬염 함유 비수계 전해액은, 비수 전해액과 리튬염으로 이루어져 있으며, 비수 전해액으로는 액상 비수 전해액, 고체 전해질, 무기 고체 전해질 등이 사용된다. The lithium salt-containing non-aqueous electrolyte solution consists of a nonaqueous electrolyte solution and a lithium salt, and a liquid nonaqueous electrolyte solution, a solid electrolyte, an inorganic solid electrolyte, and the like are used as the nonaqueous electrolyte solution.
상기 집전체, 전극 활물질, 도전재, 바인더, 충진제, 분리막, 전해액, 리튬염 등은 당업계에 공지되어 있으므로, 그에 대한 자세한 설명은 본 명세서에서 생략한다. Since the current collector, the electrode active material, the conductive material, the binder, the filler, the separator, the electrolyte, the lithium salt, and the like are known in the art, a detailed description thereof will be omitted herein.
본 발명에 따른 리튬 이차전지는 당업계에 공지되어 있는 통상적인 방법에 의해 제조될 수 있다. 즉, 양극과 음극 사이에 다공성 분리막을 삽입하고 거기에 전해액을 주입하여 제조할 수 있다. The lithium secondary battery according to the present invention can be produced by conventional methods known in the art. That is, it may be prepared by inserting a porous separator between the anode and the cathode and injecting the electrolyte therein.
양극은, 예를 들어, 앞서 설명한 리튬 전이 금속 산화물 활물질과 도전재 및 결합제를 함유한 슬러리를 집전체위에 도포한 후 건조하여 제조할 수 있다. 마찬가지로 음극은, 예를 들어, 앞서 설명한 탄소 활물질과 도전재 및 결합제를 함유한 슬러리를 얇은 집전체 위에 도포한 후 건조하여 제조할 수 있다. The positive electrode may be manufactured by, for example, applying a slurry containing the lithium transition metal oxide active material, a conductive material, and a binder as described above onto a current collector and then drying. Similarly, the negative electrode can be prepared by, for example, applying a slurry containing the above-described carbon active material, a conductive material and a binder onto a thin current collector and then drying it.
본 발명은 또한, 상기 이차전지를 단위전지로서 둘 또는 그 이상 포함하는 전지팩을 제공한다. The present invention also provides a battery pack including two or more of the secondary battery as a unit cell.
본 발명에 따른 전지팩은 장착 효율성, 구조적 안정성 등을 고려할 때, 한정된 장착공간을 가지며 잦은 진동과 강한 충격 등에 노출되는 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 또는 전력 저장장치의 전원으로 바람직하게 사용될 수 있다.The battery pack according to the present invention has a limited mounting space in consideration of mounting efficiency, structural stability, etc. and is a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device exposed to frequent vibrations and strong impacts. Can be preferably used.

Claims (16)

  1. 전극 집전체 및 상기 전극 집전체의 적어도 일면에 적용된 활물질층을 포함하는 전극에 있어서, 전극 집전체의 선단부에 장력을 보강하기 위한 보강재가 적용되어 있는 전극.An electrode comprising an electrode current collector and an active material layer applied to at least one surface of the electrode current collector, wherein a reinforcing material for reinforcing tension is applied to the distal end of the electrode current collector.
  2. 제1항에 있어서,The method of claim 1,
    상기 보강재가 전극 집전체 선단부의 폭방향 단부에 적용되어 있는 것을 특징으로 하는 전극.The reinforcing material is applied to the widthwise end portion of the tip portion of the electrode current collector.
  3. 제1항에 있어서,The method of claim 1,
    상기 보강재가 전극 집전체 선단부의 길이방향 양 단부에 적용되어 있는 것을 특징으로 하는 전극.The reinforcing material is applied to both ends of the electrode in the longitudinal direction of the electrode current collector.
  4. 제1항에 있어서,The method of claim 1,
    상기 보강재가 전극 집전체 선단부의 폭방향 단부와 길이방향 양 단부에 적용되어 있는 것을 특징으로 하는 전극.The reinforcing material is applied to the width direction end part and the longitudinal direction both end part of an electrode collector tip part, The electrode characterized by the above-mentioned.
  5. 제1항 내지 제5항중 어느 한 항에 있어서,The method according to any one of claims 1 to 5,
    상기 보강재가 전극 집전체 선단부로부터 활물질층이 시작되는 부분에까지 연장되어 적용되어 있는 것을 특징으로 하는 전극.And the reinforcing material extends from the tip of the electrode current collector to a portion where the active material layer starts.
  6. 제1항 내지 제5항중 어느 한 항에 있어서,The method according to any one of claims 1 to 5,
    상기 보강재가 전극 집전체 선단부의 양면에 적용되어 있는 것을 특징으로 하는 전극.The reinforcing material is applied to both sides of the electrode current collector front end portion.
  7. 제1항에 있어서,The method of claim 1,
    상기 보강재가 10 내지 100 ㎛의 두께를 가지는 것을 특징으로 하는 전극.The reinforcing material has an electrode having a thickness of 10 to 100 ㎛.
  8. 제1항에 있어서,The method of claim 1,
    상기 보강재가 활물질층보다 얇은 두께를 가지는 것을 특징으로 하는 전극.And the reinforcing material has a thickness thinner than that of the active material layer.
  9. 제1항에 있어서,The method of claim 1,
    상기 보강재가 폴리테트라플루오로에틸렌(PTFE)，테트라플루오로에틸렌 헥사플루오로프로필렌 공중합체(FEP)，테트라플루오로에틸렌-에틸렌 공중합체(ETFE)，테트라플루오로에틸렌-퍼플루오로알킬비닐에테르 공중합체(PFA)，폴리불화 비닐리덴(PVDF)，폴리부틸렌 테레프탈레이트(PBT)，폴리에틸렌 테레프탈레이트(PET), 폴리에틸렌(PE)，폴리염화비닐(PVC)，아세테이트 수지, 폴리이미드, 아세테이트, glass cloth 테이프, 폴리에스테르, 폴리페닐렌설파이드(Polyphenylenesulfide, PPS), 폴리프로필렌(polypropylene) 수지 및 SUS (steel use stainless)로 이루어진 군으로부터 선택된 1종 또는 2종 이상의 혼합체로부터 형성되는 것을 특징으로 하는 전극.The reinforcing material is polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-perfluoroalkyl vinyl ether air PFA, polyvinylidene fluoride (PVDF), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), acetate resin, polyimide, acetate, glass An electrode, characterized in that formed from one or two or more mixtures selected from the group consisting of cloth tapes, polyesters, polyphenylenesulfides (PPS), polypropylene resins, and SUS (steel use stainless).
  10. 제1항에 있어서,The method of claim 1,
    상기 전극 집전체가 알루미늄인 것을 특징으로 하는 전극.And the electrode current collector is aluminum.
  11. 제1항에 있어서,The method of claim 1,
    보강재 1매가 전극 집전체 선단부 양면의 폭방향 단부, 길이방향 양 단부 또는 이들 둘다를 둘러싸고 있는 것을 특징으로 하는 전극.An electrode according to claim 1, wherein one reinforcing material surrounds the widthwise end portions, the longitudinal both ends, or both of the front end portions of the electrode current collectors.
  12. 제1항에 기재된 전극을 포함하는 젤리-롤형 전극조립체.A jelly-roll type electrode assembly comprising the electrode according to claim 1.
  13. 제12항에 기재된 젤리-롤형 전극조립체가 전지케이스의 내부에 밀봉되어 있는 이차전지.A secondary battery in which the jelly-roll type electrode assembly according to claim 12 is sealed inside the battery case.
  14. 제13항에 기재된 이차전지를 단위전지로서 둘 또는 그 이상 포함하는 것을 특징으로 하는 전지팩.A battery pack comprising two or more of the secondary battery according to claim 13 as a unit cell.
  15. 제14항에 있어서,The method of claim 14,
    상기 전지팩은 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 또는 전력 저장장치의 전원으로 사용되는 것을 특징으로 하는 전지팩.The battery pack is a battery pack, characterized in that used as a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
  16. 양극, 분리막 및 음극으로 이루어진 젤리-롤형 전극조립체를 포함하는 이차전지의 제조 방법에 있어서, In the manufacturing method of a secondary battery comprising a jelly-roll type electrode assembly consisting of a positive electrode, a separator and a negative electrode,
    전극 집전체 선단부의 폭방향 단부와 전극 집전체 후단부의 폭방향 단부가 형성될 곳에 걸쳐 보강재를 적용하는 단계, 및Applying a reinforcing material over a widthwise end portion of the front end portion of the electrode current collector and a widthwise end portion of the rear end portion of the electrode current collector;
    상기 전극 집전체를 단위 전지 간격으로 절단하는 단계를 포함하고, Cutting the electrode current collector at unit cell intervals;
    이로써 하나의 전극 집전체의 선단부 폭방향 단부 및 다른 전극 집전체의 후단부 폭방향 단부에 보강재가 적용되도록 하는 이차전지의 제조방법.Thus, a method of manufacturing a secondary battery, such that a reinforcing material is applied to a widthwise end portion of a front end portion of one electrode current collector and a widthwise end portion of a rear end portion of another electrode current collector.
PCT/KR2014/009230 2013-09-30 2014-09-30 Electrode having improved poor slanting movement, and secondary battery having same WO2015047047A1 (en)

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JPH10162859A (en) * 1996-11-28 1998-06-19 Fuji Elelctrochem Co Ltd Nonaqueous electrolyte secondary battery
KR20040058918A (en) * 2002-12-27 2004-07-05 삼성에스디아이 주식회사 Battery unit and the winding method thereof and lithum secondary battery using the same
KR20060134351A (en) * 2005-06-22 2006-12-28 삼성에스디아이 주식회사 Secondary battery and electrodes assembly using the same
JP2012248282A (en) * 2011-05-25 2012-12-13 Sanyo Electric Co Ltd Nonaqueous electrolyte secondary battery
JP2013152870A (en) * 2012-01-25 2013-08-08 Sanyo Electric Co Ltd Nonaqueous electrolytic secondary battery and method of manufacturing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10162859A (en) * 1996-11-28 1998-06-19 Fuji Elelctrochem Co Ltd Nonaqueous electrolyte secondary battery
KR20040058918A (en) * 2002-12-27 2004-07-05 삼성에스디아이 주식회사 Battery unit and the winding method thereof and lithum secondary battery using the same
KR20060134351A (en) * 2005-06-22 2006-12-28 삼성에스디아이 주식회사 Secondary battery and electrodes assembly using the same
JP2012248282A (en) * 2011-05-25 2012-12-13 Sanyo Electric Co Ltd Nonaqueous electrolyte secondary battery
JP2013152870A (en) * 2012-01-25 2013-08-08 Sanyo Electric Co Ltd Nonaqueous electrolytic secondary battery and method of manufacturing the same

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