WO2018074849A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018074849A1
WO2018074849A1 PCT/KR2017/011548 KR2017011548W WO2018074849A1 WO 2018074849 A1 WO2018074849 A1 WO 2018074849A1 KR 2017011548 W KR2017011548 W KR 2017011548W WO 2018074849 A1 WO2018074849 A1 WO 2018074849A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
electrode
negative electrode
positive electrode
fuse
Prior art date
Application number
PCT/KR2017/011548
Other languages
French (fr)
Korean (ko)
Inventor
김수현
이수림
오송택
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.)
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201790000536.0U priority Critical patent/CN208423078U/en
Publication of WO2018074849A1 publication Critical patent/WO2018074849A1/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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • 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
    • 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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/103—Fuse
    • 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 a secondary battery, and more particularly to a secondary battery with improved safety during internal and external short circuit.
  • the primary battery is a consumable battery, commonly referred to as a battery.
  • the secondary battery is a rechargeable battery manufactured using a material that can be repeated a number of redox process between the current and the material, the power is charged when the reduction reaction to the material by the electric current, the oxidation reaction to the material When performed, the power is discharged. As the charge-discharge is repeatedly performed, electricity is generated.
  • the lithium ion battery of the secondary battery is coated with a positive active foil and a negative electrode conductive foil in a predetermined thickness, respectively, and the separator is interposed between the two conductive foils to approximately jelly roll (jelly roll) or cylindrical form a plurality of times
  • the electrode assembly produced by winding is housed in a cylindrical or square can, a pouch, or the like, and is manufactured by sealing it.
  • FIG. 1 is a perspective view showing a conventional differential vehicle and medium and large lithium ion battery.
  • Korean Unexamined Patent Publication No. 10-2013-0064229 discloses a secondary battery pack including a single cup type pouch type secondary battery.
  • Such conventional pouch-type automotive and medium-large lithium ion batteries have a problem in that they become vulnerable to internal short test and external short test as the cell capacity increases or the cell resistance decreases.
  • the conventional pouch-type automotive and medium-large lithium ion batteries have more thermal energy by increasing the capacity of the cell and decreasing the resistance when the safety experiment is conducted in the direction of increasing the short circuit current generated in the internal short circuit test and the external short test. There was a problem that occurs and leads to ignition.
  • an object of the present invention is to provide a secondary battery that can electrically connect a plurality of electrode assemblies and short the current at a specific current.
  • a secondary battery includes a plurality of electrode assemblies and a pouch for separately accommodating the plurality of electrode assemblies, a connecting portion for electrically connecting the plurality of electrode assemblies, and a connection at the predetermined current to disconnect the wires. Characterized in that it comprises a fuse.
  • the plurality of electrode assemblies may be connected in parallel by the connection unit.
  • the plurality of electrode assemblies may be disposed on a virtual plane.
  • connection part may include an anode connection part connecting the anodes of the electrode assembly to the anodes and a cathode connection part connecting the cathodes of the electrode assembly to the cathodes.
  • An end portion of the positive electrode connecting portion may be connected to the positive electrode tab, and an end portion of the negative electrode connecting portion may be connected to the negative electrode tab.
  • the center portion of the positive electrode connecting portion may be connected to the positive electrode tab, and the center portion of the negative electrode connecting portion may be connected to the negative electrode tab.
  • the fuse part may be provided in at least one of the positive electrode connecting part and the negative electrode connecting part.
  • the fuse unit may be provided in at least one of the positive electrode connecting portion and the negative electrode connecting portion so as to be positioned between any one electrode assembly among the plurality of electrode assemblies and another electrode assembly immediately adjacent to the electrode assembly.
  • the fuse unit may be provided in the connection unit so as to be connected between any one electrode assembly among the plurality of electrode assemblies and another electrode assembly immediately adjacent to each other.
  • the fuse unit may be disconnected between 10A and 1000A.
  • FIG. 1 is a perspective view showing a conventional differential vehicle and medium and large lithium ion battery.
  • FIG. 2 is a plan perspective view showing in plan view so that the inside of a secondary battery according to an embodiment of the present invention is visible.
  • FIG. 3 is a plan perspective view of the secondary battery according to another embodiment of the present invention, which is shown in a plane view.
  • FIG. 4 is a diagram showing a state in which a current moves in a state in which a conventional secondary battery is internally short-circuited and indicated by arrows.
  • FIG. 5 is a diagram illustrating a state in which a current is moved in an arrow state in a state in which a secondary battery according to an embodiment of the present invention is internally short-circuited.
  • FIG. 6 is a state diagram in which a current is moved in an external short-circuit test state using arrows.
  • FIG. 7 is a state diagram in which a current is indicated by an arrow in a direction in which a secondary battery according to an embodiment is externally short-circuited;
  • FIG. 2 is a plan perspective view showing in plan view so that the inside of a secondary battery according to an embodiment of the present invention is visible.
  • a secondary battery includes a pouch 100 for separately receiving a plurality of electrode assemblies 1 and the plurality of electrode assemblies 1, and the plurality of electrodes. And a fuse unit 300 electrically connected to the assembly 1 and a fuse unit 300 provided at the connection unit 200 and disconnected at a predetermined current.
  • the electrode assembly 1 may be manufactured by stacking a plurality of separators interposed between a cathode coated with a cathode active material, a cathode coated with an anode active material, and a separator interposed between the cathode and the anode.
  • the electrode assembly 1 may be manufactured by winding a laminate in which a cathode, a separator, and a cathode are laminated in a jelly roll form.
  • the positive electrode may be an aluminum plate, and may include a positive electrode holding part to which the positive electrode active material is coated, and a positive electrode non-coating part to which the positive electrode active material is not coated.
  • 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 holding part is formed by applying a positive electrode active material to a portion of at least one side of the aluminum plate, and the remaining portion of the aluminum plate without the positive electrode active material may be a positive electrode non-coating portion.
  • the positive electrode tab may be attached to the positive electrode tab.
  • the negative electrode may be a copper plate, and may include a negative electrode holding portion to which the negative electrode active material is applied and a negative electrode non-coating portion to which the negative electrode active material is not coated.
  • the negative electrode tab may be attached to the negative electrode tab.
  • 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 holding part is 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 separator is, for example, any one selected from the group consisting of polyethylene (PE), polystyrene (PS), polypropylene (PP), and copolymers of polyethylene (PE) and polypropylene (PP). It can be prepared by coating a polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP co-polymer).
  • PE polyethylene
  • PS polystyrene
  • PP polypropylene
  • PVDF-HFP co-polymer polyvinylidene fluoride-hexafluoropropylene copolymer
  • the negative electrode tab 3a or the positive electrode tab 3b is connected to the connection part 200, which is connected to the negative electrode tab 3a and the positive electrode tab 3b respectively formed in the plurality of electrode assemblies 1. ) Can be electrically connected to each other.
  • connection part 200 is divided into a negative electrode connection part 220 connected to the negative electrode tab 3a and a positive electrode connection part 210 connected to the positive electrode tab 3b, and the negative electrode tab 3a is a negative electrode tab ( 3a) may be connected to each other, and the positive electrode tab 3b may be connected to the positive electrode tab 3b.
  • connection part 200 may be electrically connected to an electrode tab whose end is exposed to the outside of the pouch 100.
  • An end of the negative electrode connection part 220 may be connected to the external negative electrode tab 120 and may be connected to the positive electrode connection part 210. ) May be connected to the external positive electrode tab 110.
  • FIG. 3 is a plan perspective view of the secondary battery according to another embodiment of the present invention, which is shown in a plane view.
  • connection part 200 may be electrically connected to an electrode tab whose center part is exposed to the outside of the pouch 100.
  • the center part of the negative electrode connection part 220 may be connected to the external negative electrode tab 120.
  • the center portion of the positive electrode connecting portion 210 may be connected to the positive electrode tab 110.
  • connection part 200 may change the connection structure corresponding to the position of the electrode tab.
  • the plurality of electrode assemblies 1 may be connected in parallel by the connection part 200.
  • the plurality of electrode assemblies 1 connected in parallel may be arranged to be aligned on a virtual plane.
  • the fuse unit 300 may be provided in plural in the connection unit 200. More specifically, the fuse unit 300 may be the other one in which the fuse unit 300 is immediately adjacent to any one electrode assembly 1a of the plurality of electrode assemblies 1. It may be provided in the connecting portion 200 so as to be connected between each of the electrode assembly (1b).
  • the fuse part 300 may be provided in at least one of the positive electrode connection part 210 and the negative electrode connection part 220.
  • the fuse unit 300 may be provided in plural in at least one of the positive electrode connection unit 210 and the negative electrode connection unit 220. Preferably, the fuse unit 300 may be directly connected to any one electrode assembly 1a of the plurality of electrode assemblies 1. It may be provided to be positioned between the other one electrode assembly (1b).
  • the fuse unit 300 may be disconnected between 10A and 1000A so that electricity flowing through the connection unit 200 is blocked.
  • FIG. 4 is a diagram showing a state in which a current moves in a state in which a conventional secondary battery is internally short-circuited and indicated by arrows.
  • the conventional secondary battery has a single electrode assembly or a structure in which jelly rolls are stacked to form a structure in which a nail N passes through the electrode assembly 1 in an internal short circuit experiment. As all currents I of the secondary battery pass through, the secondary battery may ignite as much heat is generated.
  • FIG. 5 is a diagram illustrating a state in which a current is moved in an arrow state in a state in which a secondary battery according to an embodiment of the present invention is internally short-circuited.
  • the secondary battery according to the exemplary embodiment of the present invention does not penetrate the nail N because the plurality of electrode assemblies 1 are arranged in parallel on an imaginary plane and connected in parallel.
  • the fuse 300 provided in the connection part 200 is short-circuited so that the current I of the electrode assembly 1 does not flow to the electrode assembly 1 through which the nail N penetrates, thereby shortening the nail N from the plurality of electrode assemblies 1. Only the current I of the penetrating electrode assembly 1 penetrates to the penetrating portion of the nail N to generate a minimum amount of heat, thereby increasing the safety of the secondary battery.
  • FIG. 6 is a state diagram in which a current is moved in an external short-circuit test state using arrows.
  • the conventional secondary battery does not have a safety kit, and thus, when an external short circuit occurs, all currents I of the secondary battery may flow through the electrode tab to the external short circuit portion S and ignite.
  • FIG. 7 is a state diagram in which a current is indicated by an arrow in a direction in which a secondary battery according to an embodiment is externally short-circuited;
  • the fuse part 300 provided in the connection part 200 is short-circuited, and only a minimum current flows to the external short circuit part S.
  • the fuse part 300 provided in the connection part 200 is short-circuited, and only a minimum current flows to the external short circuit part S.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The present invention relates to a secondary battery having improved safety when internally and externally short-circuited. In addition, the present invention comprises: a plurality of electrode assemblies; a pouch for accommodating the plurality of electrode assemblies separately; a connection unit for electrically connecting the plurality of electrode assemblies; and a fuse unit which is provided in the connection unit and is disconnected at a predetermined current.

Description

2차 전지Secondary battery
관련출원과의 상호인용Citation with Related Applications
본 출원은 2016년 10월 20일자 한국 특허 출원 제10-2016-0136426호에 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. 10-2016-0136426 dated October 20, 2016, and all the contents disclosed in the literature of that Korean patent application are incorporated as part of this specification.
기술분야Technical Field
본 발명은 2차 전지에 관한 것으로서, 보다 자세하게는 내부 및 외부 단락 시 안전성이 개선된 2차 전지에 관한 것이다.The present invention relates to a secondary battery, and more particularly to a secondary battery with improved safety during internal and external short circuit.
물질의 물리적 반응이나 화학적 반응을 통해 전기에너지를 생성시켜 외부로 전원을 공급하게 되는 전지(cell, battery)는 각종 전기전자 기기로 둘러싸여 있는 생활환경에 따라, 건물로 공급되는 교류 전원을 획득하지 못할 경우나 직류전원이 필요할 경우 사용하게 된다.Cells and batteries that generate electric energy through physical or chemical reactions of materials and supply power to the outside cannot obtain AC power supplied to buildings according to the living environment surrounded by various electric and electronic devices. It is used when DC power is needed.
이와 같은 전지 중에서 화학적 반응을 이용하는 화학전지인 일차전지와 이차전지가 일반적으로 많이 사용되고 있는데, 일차전지는 건전지로 통칭되는 것으로 소모성 전지이다. 또한, 이차전지는 전류와 물질 사이의 산화환원과정이 다수 반복 가능한 소재를 사용하여 제조되는 재충전식 전지로서, 전류에 의해 소재에 대한 환원반응이 수행되면 전원이 충전되고, 소재에 대한 산화반응이 수행되면 전원이 방전되는데, 이와 같은 충전-방전이 반복적으로 수행되면서 전기가 생성되게 된다.Among such batteries, a primary battery and a secondary battery, which are chemical cells using chemical reactions, are generally used. The primary battery is a consumable battery, commonly referred to as a battery. In addition, the secondary battery is a rechargeable battery manufactured using a material that can be repeated a number of redox process between the current and the material, the power is charged when the reduction reaction to the material by the electric current, the oxidation reaction to the material When performed, the power is discharged. As the charge-discharge is repeatedly performed, electricity is generated.
한편, 이차 전지 중 리튬이온 전지는 양극 도전 포일과 음극 도전 포일에 각각 활물질을 일정한 두께로 코팅하고, 상기 양 도전 포일 사이에는 분리막이 개재되도록 하여 대략 젤리 롤(jelly roll) 내지는 원통 형태로 다수 회 권취하여 제작한 전극 조립체를 원통형 또는 각형 캔, 파우치 등에 수납하고 이를 밀봉 처리하여 제작된다. On the other hand, the lithium ion battery of the secondary battery is coated with a positive active foil and a negative electrode conductive foil in a predetermined thickness, respectively, and the separator is interposed between the two conductive foils to approximately jelly roll (jelly roll) or cylindrical form a plurality of times The electrode assembly produced by winding is housed in a cylindrical or square can, a pouch, or the like, and is manufactured by sealing it.
도 1은 종래의 차동차용 및 중대형 리튬이온 전지를 도시한 사시도이다.1 is a perspective view showing a conventional differential vehicle and medium and large lithium ion battery.
종래에는 파우치형 자동차용 및 중대형 리튬이온 전지를 제작 시 젤리롤(jelly roll; 10) 또는 스택형 전극 조립체를 하나 또는 수직으로 적층하는 구조를 사용한다.Conventionally, when fabricating a pouch-type vehicle and a medium-large lithium ion battery, a jelly roll (jelly roll; 10) or a stacked electrode assembly is used.
대한민국 공개특허공보 제10-2013-0064229호에는 싱글컵 타입의 파우치형 이차전지를 포함하는 이차전지 팩이 개시되어 있다.Korean Unexamined Patent Publication No. 10-2013-0064229 discloses a secondary battery pack including a single cup type pouch type secondary battery.
이러한 종래의 파우치형 자동차용 및 중대형 리튬이온 전지는 셀의 용량이 커지거나 셀의 저항이 작아질수록 내부 단락 실험(nail test) 및 외부 단락 실험에 취약하다는 문제점이 있었다.Such conventional pouch-type automotive and medium-large lithium ion batteries have a problem in that they become vulnerable to internal short test and external short test as the cell capacity increases or the cell resistance decreases.
즉, 종래의 파우치형 자동차용 및 중대형 리튬이온 전지는 내부 단락 실험 및 외부 단락 실험에서 발생하는 단락 전류가 증가하는 방향으로 안전성 실험을 할 경우 셀의 용량 증가 및 저항 감소에 의해 더 많은 열적 에너지를 발생하여 발화에 이르게 하는 문제점이 있었다.In other words, the conventional pouch-type automotive and medium-large lithium ion batteries have more thermal energy by increasing the capacity of the cell and decreasing the resistance when the safety experiment is conducted in the direction of increasing the short circuit current generated in the internal short circuit test and the external short test. There was a problem that occurs and leads to ignition.
따라서 본 발명은 위와 같은 문제점을 해결하기 위해 안출된 것으로서, 본 발명의 과제는 복수 개의 전극조립체를 전기적으로 연결하고 특정 전류에서 전류를 단락시킬 수 있는 2차 전지를 제공하는 것이다.Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a secondary battery that can electrically connect a plurality of electrode assemblies and short the current at a specific current.
본 발명의 일 실시예에 따른 2차 전지는 복수 개의 전극조립체 및 상기 복수 개의 전극조립체를 구분되게 수용하는 파우치, 상기 복수 개의 전극조립체를 전기적으로 연결하는 연결부 및 상기 연결부에 마련되어 소정의 전류에서 단선되는 퓨즈부를 포함하는 것을 특징으로 한다.According to an embodiment of the present invention, a secondary battery includes a plurality of electrode assemblies and a pouch for separately accommodating the plurality of electrode assemblies, a connecting portion for electrically connecting the plurality of electrode assemblies, and a connection at the predetermined current to disconnect the wires. Characterized in that it comprises a fuse.
상기 복수 개의 전극조립체는 상기 연결부에 의해 병렬로 연결될 수 있다.The plurality of electrode assemblies may be connected in parallel by the connection unit.
상기 복수 개의 전극조립체는 가상의 평면상에 배치될 수 있다.The plurality of electrode assemblies may be disposed on a virtual plane.
상기 연결부는 상기 전극조립체의 양극을 양극끼리 연결하는 양극 연결부와 상기 전극조립체의 음극을 음극끼리 연결하는 음극 연결부를 포함할 수 있다.The connection part may include an anode connection part connecting the anodes of the electrode assembly to the anodes and a cathode connection part connecting the cathodes of the electrode assembly to the cathodes.
상기 양극 연결부의 단부는 양극탭과 연결되고, 상기 음극 연결부의 단부는 음극탭과 연결될 수 있다.An end portion of the positive electrode connecting portion may be connected to the positive electrode tab, and an end portion of the negative electrode connecting portion may be connected to the negative electrode tab.
상기 양극 연결부의 중앙부는 양극탭과 연결되고, 상기 음극 연결부의 중앙부는 음극탭과 연결될 수 있다.The center portion of the positive electrode connecting portion may be connected to the positive electrode tab, and the center portion of the negative electrode connecting portion may be connected to the negative electrode tab.
상기 퓨즈부는 상기 양극 연결부와 상기 음극 연결부 중 적어도 어느 하나에 마련될 수 있다.The fuse part may be provided in at least one of the positive electrode connecting part and the negative electrode connecting part.
상기 퓨즈부는 상기 복수 개의 전극조립체 중에서 어느 하나의 전극조립체와 바로 이웃하는 다른 하나의 전극조립체의 사이에 위치되도록 상기 양극 연결부와 상기 음극 연결부 중 적어도 어느 하나에 마련될 수 있다.The fuse unit may be provided in at least one of the positive electrode connecting portion and the negative electrode connecting portion so as to be positioned between any one electrode assembly among the plurality of electrode assemblies and another electrode assembly immediately adjacent to the electrode assembly.
상기 퓨즈부는 상기 복수 개의 전극조립체 중에서 어느 하나의 전극조립체와 바로 이웃하는 다른 하나의 전극조립체의 사이마다 각각 연결되도록 상기 연결부에 마련될 수 있다.The fuse unit may be provided in the connection unit so as to be connected between any one electrode assembly among the plurality of electrode assemblies and another electrode assembly immediately adjacent to each other.
상기 퓨즈부는 10A ~ 1000A의 사이에서 단선될 수 있다.The fuse unit may be disconnected between 10A and 1000A.
상기 퓨즈부가 단선되면 상기 연결부를 통해 흐르는 전기가 차단될 수 있다.When the fuse part is disconnected, electricity flowing through the connection part may be cut off.
본 발명에 따르면, 내부 단락 실험에서 안전성을 확보하는 효과가 있다.According to the present invention, there is an effect of ensuring the safety in the internal short-circuit experiment.
본 발명에 따르면, 외부 단락 실험에서 안전성을 확보하는 효과가 있다.According to the present invention, there is an effect of ensuring the safety in the external short-circuit experiment.
본 발명에 따르면, 복수 개의 전극조립체의 연결부 각각에 퓨즈부를 마련하여 과전류 발생 시 최적의 위치에서 퓨즈부를 단락시킬 수 있어 전류 차단 효과를 극대화할 수 있다.According to the present invention, by providing a fuse in each of the connecting portion of the plurality of electrode assembly can short-circuit the fuse at the optimum position when the overcurrent occurs, it is possible to maximize the current blocking effect.
본 발명에 따르면, 간단한 구조로 안전성을 극대화하는 효과가 있다.According to the present invention, there is an effect of maximizing safety with a simple structure.
도 1은 종래의 차동차용 및 중대형 리튬이온 전지를 도시한 사시도이다.1 is a perspective view showing a conventional differential vehicle and medium and large lithium ion battery.
도 2는 본 발명의 일 실시예에 따른 2차 전지의 내부가 보이도록 평면에서 도시한 평면 투시도이다.FIG. 2 is a plan perspective view showing in plan view so that the inside of a secondary battery according to an embodiment of the present invention is visible.
도 3은 본 발명의 다른 실시예에 따른 2차 전지의 내부가 보이도록 평면에서 도시한 평면 투시도이다.3 is a plan perspective view of the secondary battery according to another embodiment of the present invention, which is shown in a plane view.
도 4는 종래의 2차 전지를 내부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.4 is a diagram showing a state in which a current moves in a state in which a conventional secondary battery is internally short-circuited and indicated by arrows.
도 5는 본 발명의 일 실시예에 따른 2차 전지를 내부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.FIG. 5 is a diagram illustrating a state in which a current is moved in an arrow state in a state in which a secondary battery according to an embodiment of the present invention is internally short-circuited.
도 6은 종래의 2차 전지를 외부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.FIG. 6 is a state diagram in which a current is moved in an external short-circuit test state using arrows. FIG.
도 7은 본 발명의 일 실시예에 따른 2차 전지를 외부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.FIG. 7 is a state diagram in which a current is indicated by an arrow in a direction in which a secondary battery according to an embodiment is externally short-circuited;
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예에 따른 2차 전지에 대하여 상세히 설명하기로 한다.Hereinafter, a secondary battery according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 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 균등물이 있을 수 있음을 이해하여야 한다.The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. 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 2는 본 발명의 일 실시예에 따른 2차 전지의 내부가 보이도록 평면에서 도시한 평면 투시도이다.FIG. 2 is a plan perspective view showing in plan view so that the inside of a secondary battery according to an embodiment of the present invention is visible.
도 2에 도시된 바와 같이, 본 발명의 일 실시예에 따른 2차 전지는 복수 개의 전극조립체(1) 및 상기 복수 개의 전극조립체(1)를 구분되게 수용하는 파우치(100), 상기 복수 개의 전극조립체(1)를 전기적으로 연결하는 연결부(200) 및 상기 연결부(200)에 마련되어 소정의 전류에서 단선되는 퓨즈부(300)를 포함한다.As shown in FIG. 2, a secondary battery according to an embodiment of the present invention includes a pouch 100 for separately receiving a plurality of electrode assemblies 1 and the plurality of electrode assemblies 1, and the plurality of electrodes. And a fuse unit 300 electrically connected to the assembly 1 and a fuse unit 300 provided at the connection unit 200 and disconnected at a predetermined current.
전극조립체(1)는 양극 활물질이 도포된 양극과 음극 활물질이 도포된 음극과 양극과 음극 사이에 개재된 분리막을 복수 회 적층하여 제작할 수 있다.The electrode assembly 1 may be manufactured by stacking a plurality of separators interposed between a cathode coated with a cathode active material, a cathode coated with an anode active material, and a separator interposed between the cathode and the anode.
그리고 전극조립체(1)는 양극과 분리막 및 음극을 적층한 적층체를 젤리 롤 형태로 권취하여 제작할 수도 있다.In addition, the electrode assembly 1 may be manufactured by winding a laminate in which a cathode, a separator, and a cathode are laminated in a jelly roll form.
양극은 알루미늄 판일 수 있으며, 양극 활물질이 도포된 양극 유지부와, 양극 활물질이 도포되지 않은 양극 무지부를 포함할 수 있다.The positive electrode may be an aluminum plate, and may include a positive electrode holding part to which the positive electrode active material is coated, and a positive electrode non-coating part to which the positive electrode active material is not coated.
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 유지부는 예를 들어, 알루미늄판의 적어도 어느 한 면의 일부에 양극 활물질을 도포하여 형성하며, 양극 활물질이 미 도포된 알루미늄판의 나머지 부분이 양극 무지부가 될 수 있다.For example, the positive electrode holding part is formed by applying a positive electrode active material to a portion of at least one side of the aluminum plate, and the remaining portion of the aluminum plate without the positive electrode active material may be a positive electrode non-coating portion.
양극 무지부에는 양극 전극 탭이 부착될 수 있다.The positive electrode tab may be attached to the positive electrode tab.
음극은 구리 판일 수 있으며, 음극 활물질이 도포된 음극 유지부와 음극 활물질이 도포되지 않은 음극 무지부를 포함할 수 있다. The negative electrode may be a copper plate, and may include a negative electrode holding portion to which the negative electrode active material is applied and a negative electrode non-coating portion to which the negative electrode active material is not coated.
음극 무지부에는 음극 전극 탭이 부착될 수 있다.The negative electrode tab may be attached to the negative electrode tab.
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 유지부는 예를 들어, 구리판의 적어도 어느 한 면의 일부에 음극 활물질을 도포하여 형성하며, 음극 활물질이 미 도포된 구리판의 나머지 부분이 음극 무지부가 될 수 있다.For example, the negative electrode holding part is 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.
분리막은 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 is, for example, any one selected from the group consisting of polyethylene (PE), polystyrene (PS), polypropylene (PP), and copolymers of polyethylene (PE) and polypropylene (PP). It can be prepared by coating a polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP co-polymer).
그리고 음극 전극탭(3a) 또는 양극 전극탭(3b)은 연결부(200)와 연결되는데, 연결부(200)는 복수 개의 전극조립체(1)에 각각 형성된 음극 전극탭(3a)과 양극 전극탭(3b)을 서로 전기적으로 연결할 수 있다.In addition, the negative electrode tab 3a or the positive electrode tab 3b is connected to the connection part 200, which is connected to the negative electrode tab 3a and the positive electrode tab 3b respectively formed in the plurality of electrode assemblies 1. ) Can be electrically connected to each other.
이때, 연결부(200)는 음극 전극탭(3a)과 연결되는 음극 연결부(220)와 양극 전극탭(3b)과 연결되는 양극 연결부(210)로 구분되어 음극 전극탭(3a)은 음극 전극탭(3a) 끼리 연결하고 양극 전극탭(3b)은 양극 전극탭(3b) 끼리 연결 할 수 있다.In this case, the connection part 200 is divided into a negative electrode connection part 220 connected to the negative electrode tab 3a and a positive electrode connection part 210 connected to the positive electrode tab 3b, and the negative electrode tab 3a is a negative electrode tab ( 3a) may be connected to each other, and the positive electrode tab 3b may be connected to the positive electrode tab 3b.
또한, 상기 연결부(200)는 단부가 파우치(100)의 외부로 노출되는 전극탭과 전기적으로 연결될 수 있는데, 음극 연결부(220)의 단부는 외부 음극 전극탭(120)과 연결되고 양극 연결부(210)의 단부는 외부 양극 전극탭(110)과 연결될 수 있다.In addition, the connection part 200 may be electrically connected to an electrode tab whose end is exposed to the outside of the pouch 100. An end of the negative electrode connection part 220 may be connected to the external negative electrode tab 120 and may be connected to the positive electrode connection part 210. ) May be connected to the external positive electrode tab 110.
도 3은 본 발명의 다른 실시예에 따른 2차 전지의 내부가 보이도록 평면에서 도시한 평면 투시도이다.3 is a plan perspective view of the secondary battery according to another embodiment of the present invention, which is shown in a plane view.
도 3에 도시된 바와 같이, 연결부(200)는 중앙부가 파우치(100)의 외부로 노출되는 전극탭과 전기적으로 연결될 수 있는데, 음극 연결부(220)의 중앙부는 외부 음극 전극탭(120)과 연결되고, 양극 연결부(210)의 중앙부는 양극 전극탭(110)과 연결될 수 있다.As shown in FIG. 3, the connection part 200 may be electrically connected to an electrode tab whose center part is exposed to the outside of the pouch 100. The center part of the negative electrode connection part 220 may be connected to the external negative electrode tab 120. The center portion of the positive electrode connecting portion 210 may be connected to the positive electrode tab 110.
이와 같이 본 발명에 따른 연결부(200)는 전극탭의 위치에 대응하여 연결 구조의 변경이 가능하다. As described above, the connection part 200 according to the present invention may change the connection structure corresponding to the position of the electrode tab.
도 2 내지 도 3에 도시된 바와 같이, 복수 개의 전극조립체(1)는 연결부(200)에 의해 병렬로 연결될 수 있다.As illustrated in FIGS. 2 to 3, the plurality of electrode assemblies 1 may be connected in parallel by the connection part 200.
그리고 병렬로 연결된 복수 개의 전극조립체(1)는 가상의 평면상에 정렬되게 배치될 수 있다.In addition, the plurality of electrode assemblies 1 connected in parallel may be arranged to be aligned on a virtual plane.
퓨즈부(300)는 연결부(200)에 복수 개로 마련될 수 있는데, 더욱 상세하게는 퓨즈부(300)가 복수 개의 전극조립체(1) 중에서 어느 하나의 전극조립체(1a)와 바로 이웃하는 다른 하나의 전극조립체(1b)의 사이마다 각각 연결되도록 연결부(200)에 마련될 수 있다.The fuse unit 300 may be provided in plural in the connection unit 200. More specifically, the fuse unit 300 may be the other one in which the fuse unit 300 is immediately adjacent to any one electrode assembly 1a of the plurality of electrode assemblies 1. It may be provided in the connecting portion 200 so as to be connected between each of the electrode assembly (1b).
또한, 퓨즈부(300)는 양극 연결부(210)와 음극 연결부(220) 중 적어도 어느 하나에 마련될 수 있다.In addition, the fuse part 300 may be provided in at least one of the positive electrode connection part 210 and the negative electrode connection part 220.
퓨즈부(300)는 양극 연결부(210)와 음극 연결부(220) 중 적어도 어느 하나에 복수 개로 마련될 수 있는데, 바람직하게는 복수 개의 전극조립체(1) 중에서 어느 하나의 전극조립체(1a)와 바로 이웃하는 다른 하나의 전극조립체(1b)의 사이에 위치되도록 마련될 수 있다.The fuse unit 300 may be provided in plural in at least one of the positive electrode connection unit 210 and the negative electrode connection unit 220. Preferably, the fuse unit 300 may be directly connected to any one electrode assembly 1a of the plurality of electrode assemblies 1. It may be provided to be positioned between the other one electrode assembly (1b).
퓨즈부(300)는 10A ~ 1000A의 사이에서 단선되어 연결부(200)를 통해 흐르는 전기가 차단되게 할 수 있다.The fuse unit 300 may be disconnected between 10A and 1000A so that electricity flowing through the connection unit 200 is blocked.
도 4는 종래의 2차 전지를 내부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.4 is a diagram showing a state in which a current moves in a state in which a conventional secondary battery is internally short-circuited and indicated by arrows.
도 4에 도시된 바와 같이, 종래의 2차 전지는 하나의 전극조립체를 갖거나 젤리롤이 적층된 구조를 형성하여 내부 단락 실험에서 네일(nail; N)이 전극조립체(1)를 관통한 부위로 2차 전지의 모든 전류(I)가 통과하게 되어 많은 열이 발생함에 따라 2차 전지가 발화할 수 있다.As shown in FIG. 4, the conventional secondary battery has a single electrode assembly or a structure in which jelly rolls are stacked to form a structure in which a nail N passes through the electrode assembly 1 in an internal short circuit experiment. As all currents I of the secondary battery pass through, the secondary battery may ignite as much heat is generated.
도 5는 본 발명의 일 실시예에 따른 2차 전지를 내부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.FIG. 5 is a diagram illustrating a state in which a current is moved in an arrow state in a state in which a secondary battery according to an embodiment of the present invention is internally short-circuited.
도 5에 도시된 바와 같이, 본 발명의 일실시예에 따른 2차 전지는 복수 개의 전극조립체(1)를 가상의 평면상에 정렬되게 배치하여 병렬로 연결하기 때문에 네일(N)이 관통하지 않은 전극조립체(1)의 전류(I)가 네일(N)이 관통한 전극조립체(1)로 흐르지 않도록 연결부(200)에 마련된 퓨즈(300)가 단락되어 복수 개의 전극조립체(1) 중에서 네일(N)이 관통한 전극조립체(1)의 전류(I)만 네일(N)의 관통한 부위로 통과하여 최소한의 열이 발생되게 할 수 있어 2차 전지의 안전성을 높이는 효과가 있다.As shown in FIG. 5, the secondary battery according to the exemplary embodiment of the present invention does not penetrate the nail N because the plurality of electrode assemblies 1 are arranged in parallel on an imaginary plane and connected in parallel. The fuse 300 provided in the connection part 200 is short-circuited so that the current I of the electrode assembly 1 does not flow to the electrode assembly 1 through which the nail N penetrates, thereby shortening the nail N from the plurality of electrode assemblies 1. Only the current I of the penetrating electrode assembly 1 penetrates to the penetrating portion of the nail N to generate a minimum amount of heat, thereby increasing the safety of the secondary battery.
도 6은 종래의 2차 전지를 외부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.FIG. 6 is a state diagram in which a current is moved in an external short-circuit test state using arrows. FIG.
도 6에 도시된 바와 같이, 종래의 2차 전지는 안전성 키트가 없어서 외부 단락 발생 시 2차 전지의 모든 전류(I)가 전극탭을 통해 외부 단락부(S)로 흘러 발화될 수 있다.As shown in FIG. 6, the conventional secondary battery does not have a safety kit, and thus, when an external short circuit occurs, all currents I of the secondary battery may flow through the electrode tab to the external short circuit portion S and ignite.
도 7은 본 발명의 일 실시예에 따른 2차 전지를 외부 단락 실험한 상태에서 전류의 이동 방향을 화살표로 표기한 사용 상태도이다.FIG. 7 is a state diagram in which a current is indicated by an arrow in a direction in which a secondary battery according to an embodiment is externally short-circuited;
도 7에 도시된 바와 같이, 본 발명의 일실시예에 따른 2차 전지는 외부 단락 발생 시 연결부(200)에 마련된 퓨즈부(300)가 단락되어 최소한의 전류만 외부 단락부(S)로 흘러가도록 하여 단락부(S)에서 발생하는 열을 최소화함에 따라 안전성을 높이는 효과가 있다.As shown in FIG. 7, in the secondary battery according to the exemplary embodiment of the present invention, when an external short circuit occurs, the fuse part 300 provided in the connection part 200 is short-circuited, and only a minimum current flows to the external short circuit part S. By minimizing the heat generated in the short-circuit (S) it is effective to increase the safety.
상술한 바와 같이 본 발명에 따르면, 내부 단락 실험에서 안전성을 확보하는 효과가 있다.As described above, according to the present invention, there is an effect of ensuring safety in the internal short circuit experiment.
본 발명에 따르면, 외부 단락 실험에서 안전성을 확보하는 효과가 있다.According to the present invention, there is an effect of ensuring the safety in the external short-circuit experiment.
본 발명에 따르면, 복수 개의 전극조립체의 연결부 각각에 퓨즈부를 마련하여 과전류 발생 시 최적의 위치에서 퓨즈부를 단락시킬 수 있어 전류 차단 효과를 극대화할 수 있다.According to the present invention, by providing a fuse in each of the connecting portion of the plurality of electrode assembly can short-circuit the fuse at the optimum position when the overcurrent occurs, it is possible to maximize the current blocking effect.
본 발명에 따르면, 간단한 구조로 안전성을 극대화하는 효과가 있다.According to the present invention, there is an effect of maximizing safety with a simple structure.
이상과 같이 본 발명에 따른 2차 전지를 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.Although the secondary battery according to the present invention has been described with reference to the illustrated drawings as described above, the present invention is not limited by the embodiments and drawings described above, it is usually within the scope of the claims to the present invention Various implementations are possible by those with knowledge of the world.

Claims (11)

  1. 복수 개의 전극조립체(1); 및A plurality of electrode assemblies 1; And
    상기 복수 개의 전극조립체(1)를 구분되게 수용하는 파우치(100);A pouch 100 for separately receiving the plurality of electrode assemblies 1;
    상기 복수 개의 전극조립체(1)를 전기적으로 연결하는 연결부(200); 및A connection part 200 for electrically connecting the plurality of electrode assemblies 1; And
    상기 연결부(200)에 마련되어 소정의 전류에서 단선되는 퓨즈부(300); 를 포함하는 것을 특징으로 하는 2차 전지.A fuse part 300 provided at the connection part 200 and disconnected at a predetermined current; Secondary battery comprising a.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 복수 개의 전극조립체(1)는 상기 연결부(200)에 의해 병렬로 연결되는 것을 특징으로 하는 2차 전지.The plurality of electrode assemblies (1) is a secondary battery, characterized in that connected in parallel by the connecting portion (200).
  3. 청구항 1에 있어서,The method according to claim 1,
    상기 복수 개의 전극조립체(1)는 가상의 평면상에 배치되는 것을 특징으로 하는 2차 전지.And the plurality of electrode assemblies (1) are arranged on a virtual plane.
  4. 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,The method according to any one of claims 1 to 3,
    상기 연결부(200)는The connection part 200
    상기 전극조립체(1)의 양극을 양극끼리 연결하는 양극 연결부(210)와An anode connecting portion 210 connecting the anodes of the electrode assembly 1 to each other;
    상기 전극조립체(1)의 음극을 음극끼리 연결하는 음극 연결부(220)를 포함하는 것을 특징으로 하는 2차 전지.Secondary battery, characterized in that it comprises a negative electrode connecting portion 220 for connecting the negative electrode of the electrode assembly (1).
  5. 청구항 4에 있어서,The method according to claim 4,
    상기 양극 연결부(210)의 단부는 양극탭과 연결되고,An end of the positive electrode connection portion 210 is connected to the positive electrode tab,
    상기 음극 연결부(220)의 단부는 음극탭과 연결되는 것을 특징으로 하는 2차 전지. An end portion of the negative electrode connection portion 220 is connected to the negative electrode tab.
  6. 청구항 4에 있어서,The method according to claim 4,
    상기 양극 연결부(210)의 중앙부는 양극탭과 연결되고,The center portion of the positive electrode connection portion 210 is connected to the positive electrode tab,
    상기 음극 연결부(220)의 중앙부는 음극탭과 연결되는 것을 특징으로 하는 2차 전지.A secondary battery, characterized in that the center portion of the negative electrode connection portion 220 is connected to the negative electrode tab.
  7. 청구항 4에 있어서,The method according to claim 4,
    상기 퓨즈부(300)는 상기 양극 연결부(210)와 상기 음극 연결부(220) 중 적어도 어느 하나에 마련되는 것을 특징으로 하는 2차 전지.The fuse unit 300 is a secondary battery, characterized in that provided in at least one of the positive electrode connection portion 210 and the negative electrode connection portion (220).
  8. 청구항 7에 있어서,The method according to claim 7,
    상기 퓨즈부(300)는 상기 복수 개의 전극조립체(1) 중에서 어느 하나의 전극조립체(1a)와 바로 이웃하는 다른 하나의 전극조립체(1b)의 사이에 위치되도록 상기 양극 연결부(210)와 상기 음극 연결부(220) 중 적어도 어느 하나에 마련되는 것을 특징으로 하는 2차 전지.The fuse part 300 is positioned between the one electrode assembly 1a of the plurality of electrode assemblies 1 and the other electrode assembly 1b immediately adjacent to the cathode connector 210 and the cathode. Secondary battery, characterized in that provided in at least one of the connecting portion (220).
  9. 청구항 1에 있어서,The method according to claim 1,
    상기 퓨즈부(300)는 상기 복수 개의 전극조립체(1) 중에서 어느 하나의 전극조립체(1a)와 바로 이웃하는 다른 하나의 전극조립체(1b)의 사이마다 각각 연결되도록 상기 연결부(200)에 마련되는 것을 특징으로 하는 2차 전지.The fuse part 300 is provided in the connection part 200 so as to be connected between any one electrode assembly 1a and another electrode assembly 1b immediately adjacent to each other among the plurality of electrode assemblies 1. A secondary battery, characterized in that.
  10. 청구항 1에 있어서,The method according to claim 1,
    상기 퓨즈부(300)는 10A ~ 1000A의 사이에서 단선되는 것을 특징으로 하는 2차 전지.The fuse unit 300 is a secondary battery, characterized in that disconnected between 10A ~ 1000A.
  11. 청구항 1에 있어서,The method according to claim 1,
    상기 퓨즈부(300)가 단선되면 상기 연결부(200)를 통해 흐르는 전기가 차단되는 것을 특징으로 하는 2차 전지.When the fuse unit 300 is disconnected, the secondary battery, characterized in that the electricity flowing through the connection unit 200 is cut off.
PCT/KR2017/011548 2016-10-20 2017-10-18 Secondary battery WO2018074849A1 (en)

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