WO2018012788A1 - Rechargeable battery - Google Patents

Rechargeable battery Download PDF

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Publication number
WO2018012788A1
WO2018012788A1 PCT/KR2017/007110 KR2017007110W WO2018012788A1 WO 2018012788 A1 WO2018012788 A1 WO 2018012788A1 KR 2017007110 W KR2017007110 W KR 2017007110W WO 2018012788 A1 WO2018012788 A1 WO 2018012788A1
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WO
WIPO (PCT)
Prior art keywords
current collecting
electrode
collecting member
terminal
cap plate
Prior art date
Application number
PCT/KR2017/007110
Other languages
French (fr)
Korean (ko)
Inventor
권민형
Original Assignee
삼성에스디아이 주식회사
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Publication of WO2018012788A1 publication Critical patent/WO2018012788A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/147—Lids or covers
    • 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
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/154—Lid or cover comprising an axial bore for receiving a central current collector
    • 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
    • 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.
  • a rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery.
  • Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles.
  • the secondary battery has an electrode assembly formed with positive and negative electrodes on both sides of a separator, a case incorporating the electrode assembly, a cap plate sealing the opening of the case, and a penetrating plate. It includes an electrode terminal is installed and electrically connected to the electrode assembly.
  • the case of the secondary battery may be electrically neutral or have a positive or negative polarity, and may be selected according to characteristics of various electronic devices.
  • the secondary battery composed of a case charged with a positive electrode is electrically safer from a short circuit caused by penetration due to external shock or nail test than the secondary battery composed of an electrically neutral case, and can easily identify a voltage failure of the secondary battery. have.
  • a secondary battery composed of a case that is neutrally charged is more electrically unstable than a secondary battery module having a polarity, and it is not easy to form a short circuit path when penetrating due to external impact.
  • One aspect of the present invention is to provide a secondary battery that can easily form a short circuit path during external impact or penetration in a secondary battery having a neutral case.
  • a secondary battery includes an electrode assembly having a first electrode, a separator, and a second electrode, a case accommodating an electrode assembly, and having an opening, a cap assembly coupled through an opening to seal the case, and a first assembly.
  • the upper end portion may be inserted into the terminal hole of the cap plate through the second gasket.
  • the second gasket may be formed to surround an edge of the lower end portion.
  • the second gasket may include a first portion inserted into the terminal hole, a second portion located between the cap plate and the lower end portion, and a third portion located between the cap plate and the first current collecting member. .
  • the case may be in an electrically neutral state.
  • the resistance member may be made of a material having a resistance higher than that of the first current collecting member.
  • the first current collecting member may be made of aluminum.
  • the first current collecting member may further include a fuse, and the fuse may be a portion that is relatively thinner than other portions of the first current collecting member.
  • FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.
  • FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 1.
  • FIG. 4 is an exploded perspective view illustrating some components of the rechargeable battery of FIG. 1.
  • FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention
  • FIG. 2 is a cross-sectional view schematically taken along a line II-II of FIG. 1
  • FIG. 3 is a line III-III of FIG. 1.
  • the secondary battery 101 includes an electrode obtained by interposing a separator 123 between the first electrode 121 and the second electrode 122.
  • the current collecting members 140 and 142 electrically connected to the electrode assembly 120, the current collecting members 140 and 142, and the electrode assembly 120 are embedded.
  • Combined cap assembly 30 In an opening of the case 27 and the case 27 in which the assembly 120, the current collecting members 140 and 142 electrically connected to the electrode assembly 120, the current collecting members 140 and 142, and the electrode assembly 120 are embedded.
  • the secondary battery 101 will be described by way of example as being a rectangular ion as a lithium ion secondary battery.
  • the present invention is not limited thereto, and the present invention may be applied to various types of batteries such as lithium polymer batteries or cylindrical batteries.
  • the electrode assembly 120 may include a plurality of assemblies 120a and 120b, and each of the assemblies 120a and 120b may interpose a separator 123 between the first electrode 121 and the second electrode 122. After winding about the winding axis in a state, it can be pressed flat.
  • the first electrode 121 and the second electrode 122 are electrode active parts 21a and 22a which are areas where an active material is coated on a thin plate formed of a metal foil, and electrode uncoated parts that are areas where an active material is not coated ( 21b, 22b).
  • the first electrode active portion 21a is formed by applying an active material such as transition metal oxide to a metal foil such as aluminum, and the second electrode active portion 22a is formed of an active material such as graphite or carbon on a metal foil such as copper or nickel. It can form by apply
  • the first electrode uncoated portion 21b and the second electrode uncoated portion 22b protrude side by side toward the cap assembly from one side of the first electrode active portion and the second electrode active portion, respectively.
  • the first electrode uncoated portion 21b and the second electrode uncoated portion 22b are formed by cutting to protrude from the metal foil, so that the first electrode uncoated portion 21b and the second electrode uncoated portion 22b are integral with the metal foil of the first electrode active portion 21a and the second electrode active portion 22a, respectively. It can be formed as.
  • the first electrode uncoated portion 21b and the second electrode uncoated portion 22b are spaced apart from each other with different polarities.
  • the first electrode uncoated portion 21b and the second electrode uncoated portion 22b may be formed by overlapping a plurality of thin films. .
  • the thin films and the thin films may be connected by ultrasonic welding in order to facilitate current movement.
  • the separator 123 is positioned between the first electrode active portion 21a and the second electrode active portion 22a, and serves to prevent short circuits and to allow movement of lithium ions.
  • polyethylene and polypropylene It may consist of a composite film of polyethylene, polypropylene.
  • the electrode assembly 120 may be inserted into the case 27 in a direction parallel to the winding axis, and the electrode assembly 120 is received in the case 27 substantially together with the electrolyte.
  • the electrolyte may be made of lithium salts such as LiPF 6 and LiBF 4 in organic solvents such as EC, PC, DEC, EMC, and DMC.
  • the electrolyte can be liquid, solid or gel.
  • the electrode assembly 120 may include a first electrode assembly 120a and a second electrode assembly 120b, which will be described with reference to FIGS. 4 and 2 and 3.
  • FIG. 4 is an exploded perspective view illustrating some components of the rechargeable battery of FIG. 1.
  • the first electrode assembly 120a and the second electrode assembly 120b included in the electrode assembly 120 may be electrically connected to each other.
  • the electrode support portions of the same polarity in the first electrode assembly 120a and the second electrode assembly 120b are electrically connected by the current collecting member. That is, the first electrode uncoated portion 21b of the first electrode assembly 120a and the second electrode assembly 120b is electrically connected by the first current collecting member 140, and the first electrode assembly 120a and the first electrode assembly 120a are electrically connected to each other.
  • the second electrode uncoated portion 22b of the two electrode assembly 120b is electrically connected by the second current collecting member 142.
  • each of the electrode plain portions 21b and 22b is connected to the metal foil of the electrode active portion, and extends from the first plain portion 21b1 and the first plain portion to protrude in the direction of the cap assembly. It may have a second uncoated portion (21b2) having one surface in contact.
  • One surface (relatively close to the cap plate) of the first current collecting member 140 and one surface (relatively close to the current collector) of the second uncoated portion 21b2 are in contact with each other and electrically connected to each other.
  • One surface (relatively close to the cap plate) of 142 and one surface (relatively close to the current collector) of the second uncoated portion 22b2 may be electrically contacted with each other.
  • the first current collecting member 140 has a substantially rectangular plate shape and has a through hole 6 and a fuse 7.
  • the fuse 7 is a thinner portion than the other portion of the first current collecting member 140, and when the fuse 7 rises above a predetermined temperature, the fuse 7 melts and blows off. Therefore, when the secondary battery generates heat due to a malfunction or the like, the fuse 7 is blown to further prevent the secondary battery from being heated, thereby preventing the battery from being exploded due to the heating.
  • the auxiliary terminal 200 is inserted into the through hole 6 of the first current collecting member 140 together with the first sealing gasket 62.
  • auxiliary terminal 200 One end of the auxiliary terminal 200 is inserted into the first current collecting member 140 and the other end is fixed to the cap plate 31 by welding.
  • the first sealing gasket 62 is in close contact with the auxiliary terminal 200 and the first current collecting member 140, and fixes the auxiliary terminal 200 to the through hole 6.
  • the resistance member 80 is positioned on the bottom surface of the first current collecting member 140 between the first current collecting member 140 and the electrode assembly 120.
  • the resistance member 80 may have a higher resistance value than the first current collector member 140.
  • the resistance member 80 may be a material having a higher resistance value than aluminum. .
  • the resistance member 80 has an insertion hole 8 connected to the through hole 6, and one end of the auxiliary terminal 200 passing through the through hole 6 is inserted into the insertion hole 8.
  • the lower diameter of the auxiliary terminal 200 may be equal to the diameter of the insertion hole 8 or may be slightly larger depending on the elasticity of the resistance member 80. That is, the auxiliary terminal 200 is in close contact with the side wall of the insertion hole 8 by the elasticity of the resistance member 80.
  • the auxiliary terminal 200 is electrically connected to the cap plate 31 by welding, and is insulated from the first current collecting member 140 by the first sealing gasket 62 and the resistance member 80 or has a relatively high resistance. Maintain state.
  • the case 27 is formed of an approximately rectangular parallelepiped, and an opening is formed in one surface thereof.
  • the case 27 may be made of metal such as aluminum or stainless steel.
  • the cap assembly 30 is positioned on the cap plate 31 and the cap plate 31 covering the opening of the case 27, and includes a first terminal 50 and a second electrode electrically connected to the first electrode 121. And a second terminal 52 electrically connected with 122.
  • the cap plate 31 is formed in the form of an elongated plate extending in one direction and is coupled to the opening of the case 27.
  • the cap plate 31 may be formed of the same material as the case 27 and may be coupled to the case 27 by a laser welding method. Therefore, the cap plate 31 may be electrically connected to the case 27.
  • the cap plate 31 has an electrolyte injection hole 32 for injecting electrolyte and a terminal hole 5 into which the connection terminal 250 is inserted. And the vent plate 39 in which the notch 2 was formed so that it may open at a set pressure is provided in the vent hole 34. As shown in FIG. The sealing plug 38 is provided in the electrolyte injection port 32, and the connecting terminal 250 is inserted into the terminal hole 5.
  • the first terminal 50 and the second terminal 52 are respectively coupled to the connection terminal 250 in a rectangular plate shape.
  • the first terminal 50 and the second terminal 52 are respectively positioned on the cap plate 31 with the first insulating member 60 interposed therebetween, and the first insulating member 60 is each the first terminal 50. And a side surface of the second terminal 52.
  • only upper surfaces of the first terminal 50 and the second terminal 52 may be exposed to the outside.
  • the first terminal 50 is electrically connected to the first electrode 121 through the first current collecting member 140, and the second terminal 52 is connected to the second electrode via the second current collecting member 142. 122) is electrically connected.
  • the first terminal 50 and the second terminal 52 are connected to the first current collecting member 140 and the second current collecting member 142 through connection terminals, respectively, the first terminal ( The explanation will be given based on 50).
  • connection terminal 250 has a columnar shape and is installed through the cap plate 31, the first insulating member 60, and the first terminal 50, so that the first terminal 50 and the first current collecting member 140 are provided. ) Is electrically connected.
  • connection terminal 250 may be welded to the first terminal 50 while being inserted into the terminal hole 4 to be fixed to the first terminal 50.
  • the lower end of the connection terminal 250 is fixed to the first current collecting member 140 by welding.
  • the upper surface of the first current collecting member 140 and the lower surface of the connection terminal 250 may be contacted and welded, and in order to increase the contact area, the lower end of the connection terminal 250 may have a wider width than the upper end.
  • the first electrode 121 may be electrically connected to the first terminal 50 through the first current collecting member 140 and the connection terminal 250.
  • connection terminal 250 Since the connection terminal 250 is installed to pass through the terminal hole 5 of the cap plate 31 to protrude from the inside of the case 27 to the outside, a second sealing gasket 63 is installed to connect the connection terminal 250 with the connection terminal 250. Seal between the cap plates 31.
  • the second sealing gasket 63 may be formed to surround the lower portion of the connection terminal 250 as well as the terminal hole 5 of the cap plate. Since the second sealing gasket 63 does not expose the lower portion of the connection terminal 250 while sealing the terminal hole 5 of the cap plate, the second sealing gasket 63 may prevent the cap plate 31 and the connection terminal 250 from being short-circuited. .
  • connection terminal 250 has an expanded width than other portions and the second sealing gasket 63 is installed to surround the second sealing gasket 63, the second sealing gasket 63 is inserted into the terminal hole 5.
  • the first portion 63a and the second portion 63b of the second sealing gasket 63 prevent the cap plate 31 and the connection terminal 250 from being shorted, and the third portion 63c includes the cap plate ( 31 may be kept constant between the first current collecting member 140 to prevent them from being shorted.
  • the second terminal 52 is also electrically connected to the second electrode 122 through the connection terminal 250 and the second current collecting member 142 inserted into the terminal holes 5 and 9, like the first terminal 50. do.
  • the second sealing gasket 63 is formed to surround the lower portion of the connection terminal 250 as well as the terminal hole 5. As such, the first terminal 50 and the second terminal 52 overlap the cap plate 31 with the first insulating member 60 surrounding the side, respectively, and the connecting terminal 250 is the second sealing gasket. Surrounded by 63 and the case 27 including the cap plate 31 is a neutral state that is not charged with any polarity.
  • a short circuit path may be easily formed during a penetration shock or a penetration test.
  • the first electrode 121 of the electrode assembly 120 is electrically connected to the first current collecting member 140, the connection terminal 250, and the first terminal 50.
  • the electrode 122, the second current collecting member 142, the connection terminal 250, and the second terminal 52 are electrically connected to each other so that a current flows.
  • the current flows to a portion of low resistance, and the auxiliary terminal 200 installed in the first current collecting member 140 is insulated from the first current collecting member 140 by the first sealing gasket 62 and the resistance member 80.
  • the resistance member 80 having a relatively high resistance is positioned in the current path so that current flows to the first terminal 50 through the first current collecting member 140 and the connection terminal 250 having a relatively low resistance.
  • the inside of the electrode assembly is short-circuited to form the electrode assembly 120, the penetrating nail (not shown) case 27, the auxiliary terminal 200, and the resistance member ( 80 and the first current collecting member 140 are connected to remove current. Therefore, the risk of explosion due to abnormal current generation can be reduced.

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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)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

A rechargeable battery according to one embodiment of the present invention comprises: an electrode assembly having a first electrode, a separator, and a second electrode; a case accommodating the electrode assembly and having an opening; a cap assembly coupled through the opening so as to seal the case; a first current collecting member and a second current collecting member which are electrically connected to the first electrode and the second electrode, respectively; a first terminal and a second terminal which are located on the cap plate and which are electrically connected to the first current collecting member and the second current collecting member, respectively; a resistance member overlapping with the first current collecting member and having an insertion hole; a first gasket installed in a through hole of the first current collecting member; and an auxiliary terminal inserted into the first gasket and having one end thereof inserted into the insertion hole, wherein the other end of the auxiliary terminal is connected to the cap assembly.

Description

이차 전지Secondary battery
본 발명은 이차 전지에 관한 것이다.The present invention relates to a secondary battery.
이차 전지(rechargeable battery)는 일차전지와 달리 충전 및 방전을 반복적으로 수행하는 전지이다. 소용량의 이차 전지는 휴대폰이나 노트북 컴퓨터 및 캠코더와 같이 휴대가 가능한 소형 전자기기에 사용되고, 대용량 이차 전지는 하이브리드 자동차 등의 모터 구동용 전원으로 사용될 수 있다.A rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery. Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles.
이차 전지는 세퍼레이터(separator)의 양면에 양극(positive electrode)과 음극(negative electrode)을 구비하여 형성되는 전극 조립체, 전극 조립체를 내장하는 케이스, 케이스의 개구를 밀폐하는 캡 플레이트, 및 캡 플레이트에 관통 설치되어 전극 조립체에 전기적으로 연결되는 전극단자를 포함한다.The secondary battery has an electrode assembly formed with positive and negative electrodes on both sides of a separator, a case incorporating the electrode assembly, a cap plate sealing the opening of the case, and a penetrating plate. It includes an electrode terminal is installed and electrically connected to the electrode assembly.
이차 전지의 케이스는 전기적으로 중성이거나 양극 또는 음극 극성을 가질 수 있으며, 다양한 전자 기기의 특성에 맞게 선택될 수 있다. The case of the secondary battery may be electrically neutral or have a positive or negative polarity, and may be selected according to characteristics of various electronic devices.
양극으로 대전된 케이스로 구성된 이차 전지는 전기적으로 중성인 케이스로 구성된 이차 전지 보다 외부 충격 또는 네일 테스트 등으로 인한 관통에 의해서 발생되는 단락에 대해 전기적으로 안전하며, 이차 전지의 전압 불량을 쉽게 확인할 수 있다. The secondary battery composed of a case charged with a positive electrode is electrically safer from a short circuit caused by penetration due to external shock or nail test than the secondary battery composed of an electrically neutral case, and can easily identify a voltage failure of the secondary battery. have.
그러나, 중성으로 대전된 케이스로 구성된 이차 전지는 케이스가 극성을 가진 이차 전지 모듈 보다 전기적으로 불안정하며 외부 충격으로 인한 관통시 단락 경로를 형성하는 것이 용이하지 않다.However, a secondary battery composed of a case that is neutrally charged is more electrically unstable than a secondary battery module having a polarity, and it is not easy to form a short circuit path when penetrating due to external impact.
본 발명의 일 측면은 중성 케이스를 가지는 이차 전지에서 외부 충격 또는 관통시 단락 경로를 용이하게 형성할 수 있는 이차 전지를 제공하는 것이다.One aspect of the present invention is to provide a secondary battery that can easily form a short circuit path during external impact or penetration in a secondary battery having a neutral case.
본 발명의 일 실시예에 따른 이차 전지는 제1 전극, 세퍼레이터 및 제2 전극을 가지는 전극 조립체, 전극 조립체를 수용하며 개구를 가지는 케이스, 개구를 통해 결합되어 상기 케이스를 밀봉하는 캡 조립체, 제1 전극 및 제2 전극과 각각 전기적으로 연결되는 제1 집전 부재 및 제2 집전 부재, 캡 플레이트 위에 위치하며 제1 집전 부재 및 상기 제2 집전 부재와 각각 전기적으로 연결되는 제1 단자 및 제2 단자, 제1 집전 부재와 중첩하며 삽입 구멍을 가지는 저항 부재, 제1 집전 부재의 관통 구멍에 설치되는 제1 가스킷, 제1 가스킷에 삽입되며 삽입 구멍에 일단이 삽입되는 보조 단자를 포함하고, 보조 단자의 타단은 캡 조립체와 연결된다.According to an embodiment of the present invention, a secondary battery includes an electrode assembly having a first electrode, a separator, and a second electrode, a case accommodating an electrode assembly, and having an opening, a cap assembly coupled through an opening to seal the case, and a first assembly. A first current collecting member and a second current collecting member electrically connected to the electrode and the second electrode, respectively, a first terminal and a second terminal positioned on the cap plate and electrically connected to the first current collecting member and the second current collecting member, respectively; A resistance member overlapping with the first current collecting member and having an insertion hole, a first gasket installed in the through hole of the first current collecting member, an auxiliary terminal inserted into the first gasket and having one end inserted into the insertion hole, The other end is connected with the cap assembly.
상기 제1 집전 부재의 일면에 연결되며 상기 캡 플레이트 및 상기 제1 전극을 관통하여 설치되는 제1 연결 단자, 제2 집전 부재의 일면에 연결되며 상기 캡 플레이트 및 상기 제2 전극을 관통하여 설치되는 제2 연결 단자를 포함하고, 제1 연결 단자 및 제2 연결 단자는 제1 폭을 가지며 상기 캡 플레이트를 통과하는 상단부, 상기 제1 폭보다 넓은 폭의 제2 폭을 가지며 상기 일면에 연결되는 하단부를 포함할 수 있다.A first connection terminal connected to one surface of the first current collecting member and installed through the cap plate and the first electrode, and connected to one surface of the second current collecting member and installed through the cap plate and the second electrode A second connecting terminal, the first connecting terminal and the second connecting terminal having a first width and passing through the cap plate, and having a second width wider than the first width and a lower end connected to the one surface; It may include.
상기 상단부는 제2 가스킷을 통해서 상기 캡 플레이트의 단자 구멍에 삽입될 수 있다.The upper end portion may be inserted into the terminal hole of the cap plate through the second gasket.
상기 제2 가스킷은 상기 하단부의 모서리를 감싸도록 형성될 수 있다.The second gasket may be formed to surround an edge of the lower end portion.
상기 제2 가스킷은 상기 단자 구멍에 삽입되는 제1 부분, 상기 캡 플레이트와 상기 하단부 사이에 위치하는 제2 부분, 상기 캡 플레이트와 상기 제1 집전 부재 사이에 위치하는 제3 부분을 포함할 수 있다.The second gasket may include a first portion inserted into the terminal hole, a second portion located between the cap plate and the lower end portion, and a third portion located between the cap plate and the first current collecting member. .
상기 케이스는 전기적으로 중성 상태일 수 있다. The case may be in an electrically neutral state.
상기 저항 부재는 상기 제1 집전 부재의 저항보다 높은 저항을 가지는 물질로 이루어질 수 있다.The resistance member may be made of a material having a resistance higher than that of the first current collecting member.
상기 제1 집전 부재는 알루미늄으로 이루어질 수 있다.The first current collecting member may be made of aluminum.
상기 제1 집전 부재는 퓨즈를 더 포함하고, 퓨즈는 상기 제1 집전 부재의 다른 부분보다 상대적으로 두께가 얇은 부분일 수 있다. The first current collecting member may further include a fuse, and the fuse may be a portion that is relatively thinner than other portions of the first current collecting member.
본 발명의 일 실시예에 따른 이차 전지는, 케이스가 중성이더라도 관통시 단락 경로를 용이하게 형성할 수 있다.In the secondary battery according to the exemplary embodiment of the present invention, even if the case is neutral, a short circuit path may be easily formed when penetrating.
도 1은 본 발명의 일 실시예에 따른 이차 전지를 도시한 사시도이다.1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
도 2는 도 1의 Ⅱ-Ⅱ선을 따라 잘라 개략적으로 도시한 단면도이다.FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.
도 3은 도 1의 Ⅲ-Ⅲ선을 따라 잘라 개략적으로 도시한 단면도이다. 3 is a schematic cross-sectional view taken along line III-III of FIG. 1.
도 4는 도 1의 이차 전지의 일부 구성을 분해 도시한 사시도이다.4 is an exploded perspective view illustrating some components of the rechargeable battery of FIG. 1.
이하, 첨부한 도면을 참고로 하여 본 발명의 여러 실시예들에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예들에 한정되지 않는다.Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조 부호를 붙이도록 한다.In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.
또한, 도면에서 나타난 각 구성의 크기 및 두께는 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도시된 바에 한정되지 않는다.In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the illustrated.
도면에서 여러 층 및 영역을 명확하게 표현하기 위하여 두께를 확대하여 나타내었다. 그리고 도면에서, 설명의 편의를 위해, 일부 층 및 영역의 두께를 과장되게 나타내었다. 층, 막, 영역, 판 등의 부분이 다른 부분 "위에" 또는 "상에" 있다고 할 때, 이는 다른 부분 "바로 위에" 있는 경우뿐 아니라 그 중간에 또 다른 부분이 있는 경우도 포함한다.In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. When a portion of a layer, film, region, plate, or the like is said to be "on" or "on" another portion, this includes not only when the other portion is "right over" but also when there is another portion in the middle.
또한, 명세서 전체에서, 어떤 부분이 어떤 구성요소를 "포함" 한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다. 또한, 명세서 전체에서, "~상에"라 함은 대상 부분의 위 또는 아래에 위치함을 의미하는 것이며, 반드시 중력 방향을 기준으로 상 측에 위치하는 것을 의미하는 것은 아니다.In addition, throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding the other components unless otherwise stated. In addition, throughout the specification, "on" means to be located above or below the target portion, and does not necessarily mean to be located above the gravity direction.
이하에서는 첨부한 도면을 참조하여 본 발명의 일 실시예에 따른 이차 전지에 대해서 구체적으로 설명한다. Hereinafter, a secondary battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명의 일 실시예에 따른 이차 전지를 도시한 사시도이고, 도 2는 도 1의 Ⅱ-Ⅱ선을 따라 잘라 개략적으로 도시한 단면도이고, 도 3은 도 1의 Ⅲ-Ⅲ선을 따라 잘라 개략적으로 도시한 단면도이다. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention, FIG. 2 is a cross-sectional view schematically taken along a line II-II of FIG. 1, and FIG. 3 is a line III-III of FIG. 1. A cross-sectional view schematically shown along the way.
도 1 내지 도 3에 도시된 바와 같이, 본 발명의 일 실시예에 따른 이차 전지(101)는 제1 전극(121)과 제2 전극(122) 사이에 세퍼레이터(123)를 개재하여 귄취된 전극 조립체(120), 전극 조립체(120)와 전기적으로 연결된 집전 부재(140, 142), 집전 부재(140, 142) 및 전극 조립체(120)가 내장되는 케이스(27) 및 케이스(27)의 개구에 결합된 캡 조립체(30)를 포함한다. As shown in FIGS. 1 to 3, the secondary battery 101 according to the exemplary embodiment of the present invention includes an electrode obtained by interposing a separator 123 between the first electrode 121 and the second electrode 122. In an opening of the case 27 and the case 27 in which the assembly 120, the current collecting members 140 and 142 electrically connected to the electrode assembly 120, the current collecting members 140 and 142, and the electrode assembly 120 are embedded. Combined cap assembly 30.
이차 전지(101)는 리튬 이온 이차 전지로서 각형인 것을 예로서 설명한다. 다만 본 발명이 이에 제한되는 것은 아니며, 본 발명은 리튬 폴리머 전지 또는 원통형 전지 등 다양한 형태의 전지에 적용될 수 있다.The secondary battery 101 will be described by way of example as being a rectangular ion as a lithium ion secondary battery. However, the present invention is not limited thereto, and the present invention may be applied to various types of batteries such as lithium polymer batteries or cylindrical batteries.
전극 조립체(120)는 복수의 조립체(120a, 120b)를 포함할 수 있으며, 각각의 조립체(120a, 120b)는 제1 전극(121)과 제2 전극(122) 사이에 세퍼레이터(123)를 개재한 상태에서 권회축을 중심으로 권취한 후, 납작하게 가압될 수 있다. 제1 전극(121) 및 제2 전극(122)은 금속 포일(foil)로 형성되는 박판에 활물질이 도포된 영역인 전극 활성부(21a, 22a)와 활물질이 도포되지 않는 영역인 전극 무지부(21b, 22b)를 포함한다.The electrode assembly 120 may include a plurality of assemblies 120a and 120b, and each of the assemblies 120a and 120b may interpose a separator 123 between the first electrode 121 and the second electrode 122. After winding about the winding axis in a state, it can be pressed flat. The first electrode 121 and the second electrode 122 are electrode active parts 21a and 22a which are areas where an active material is coated on a thin plate formed of a metal foil, and electrode uncoated parts that are areas where an active material is not coated ( 21b, 22b).
제1 전극 활성부(21a)는 알루미늄과 같은 금속 포일에 전이 금속 산화물 등의 활물질을 도포함으로써 형성하고, 제2 전극 활성부(22a)는 구리 또는 니켈과 같은 금속 포일에 흑연 또는 탄소 등의 활물질을 도포함으로써 형성할 수 있다.The first electrode active portion 21a is formed by applying an active material such as transition metal oxide to a metal foil such as aluminum, and the second electrode active portion 22a is formed of an active material such as graphite or carbon on a metal foil such as copper or nickel. It can form by apply | coating.
제1 전극 무지부(21b)와 제2 전극 무지부(22b)는 각각 제1 전극 활성부 및 제2 전극 활성부의 일변으로부터 캡 조립체를 향하여 나란하게 돌출되어 있다. 제1 전극 무지부(21b)와 제2 전극 무지부(22b)는 금속 포일로부터 돌출되도록 절단하여 형성하므로 각각 제1 전극 활성부(21a) 및 제2 전극 활성부(22a)의 금속 포일과 일체로 형성될 수 있다. The first electrode uncoated portion 21b and the second electrode uncoated portion 22b protrude side by side toward the cap assembly from one side of the first electrode active portion and the second electrode active portion, respectively. The first electrode uncoated portion 21b and the second electrode uncoated portion 22b are formed by cutting to protrude from the metal foil, so that the first electrode uncoated portion 21b and the second electrode uncoated portion 22b are integral with the metal foil of the first electrode active portion 21a and the second electrode active portion 22a, respectively. It can be formed as.
제1 전극 무지부(21b)와 제2 전극 무지부(22b)는 서로 다른 극성으로 거리를 두고 이격 배치된다. The first electrode uncoated portion 21b and the second electrode uncoated portion 22b are spaced apart from each other with different polarities.
또한, 제1 전극(121) 및 제2 전극(122)은 권취하거나 겹쳐서 형성되므로, 제1 전극 무지부(21b) 및 제2 전극 무지부(22b)는 복수의 박막이 겹쳐져서 형성될 수 있다. 이처럼 복수의 박막이 겹쳐서 형성될 경우, 전류 이동을 용이하게 하기 위해서 초음파 용접으로 박막과 박막이 접촉하도록 연결할 수 있다. In addition, since the first electrode 121 and the second electrode 122 are formed to be wound or overlapped, the first electrode uncoated portion 21b and the second electrode uncoated portion 22b may be formed by overlapping a plurality of thin films. . As such, when a plurality of thin films are overlapped, the thin films and the thin films may be connected by ultrasonic welding in order to facilitate current movement.
세퍼레이터(123)는 제1 전극 활성부(21a)와 제2 전극 활성부(22a) 사이에 위치하며, 단락을 방지하고 리튬 이온의 이동을 가능하게 하는 역할을 하며, 예를 들어 폴리에틸렌, 폴리프로필렌, 폴리에틸렌, 폴리 프로필렌의 복합 필름으로 이루어질 수 있다.The separator 123 is positioned between the first electrode active portion 21a and the second electrode active portion 22a, and serves to prevent short circuits and to allow movement of lithium ions. For example, polyethylene and polypropylene It may consist of a composite film of polyethylene, polypropylene.
전극 조립체(120)는 권회축에 평행한 방향으로 케이스(27)에 삽입될 수 있으며, 전극 조립체(120)는 실질적으로 전해액과 함께 케이스(27)에 수납된다. 전해액은 EC, PC, DEC, EMC, DMC와 같은 유기 용매에 LiPF6, LiBF4와 같은 리튬염으로 이루어질 수 있다. 전해액은 액체, 고체 또는 겔상일 수 있다.The electrode assembly 120 may be inserted into the case 27 in a direction parallel to the winding axis, and the electrode assembly 120 is received in the case 27 substantially together with the electrolyte. The electrolyte may be made of lithium salts such as LiPF 6 and LiBF 4 in organic solvents such as EC, PC, DEC, EMC, and DMC. The electrolyte can be liquid, solid or gel.
전극 조립체(120)는 제1 전극 조립체(120a)와 제2 전극 조립체(120b)를 포함할 수 있으며, 이에 대해서는 도 4와 기 설명한 도 2 및 도 3을 참조하여 설명한다.The electrode assembly 120 may include a first electrode assembly 120a and a second electrode assembly 120b, which will be described with reference to FIGS. 4 and 2 and 3.
도 4는 도 1의 이차 전지의 일부 구성을 분해 도시한 사시도이다. 4 is an exploded perspective view illustrating some components of the rechargeable battery of FIG. 1.
도 2 내지 도 4에 도시한 바와 같이, 전극 조립체(120)에 포함된 제1 전극 조립체(120a)와 제2 전극 조립체(120b)는 전기적으로 연결될 수 있다.2 to 4, the first electrode assembly 120a and the second electrode assembly 120b included in the electrode assembly 120 may be electrically connected to each other.
제1 전극 조립체(120a)와 제2 전극 조립체(120b)에서 같은 극성의 전극 무지부는 집전 부재에 의해서 전기적으로 연결된다. 즉, 제1 전극 조립체(120a)와 제2 전극 조립체(120b)의 제1 전극 무지부(21b)는 제1 집전 부재(140)에 의해서 전기적으로 연결되고, 제1 전극 조립체(120a)와 제2 전극 조립체(120b)의 제2 전극 무지부(22b)는 제2 집전 부재(142)에 의해서 전기적으로 연결된다.The electrode support portions of the same polarity in the first electrode assembly 120a and the second electrode assembly 120b are electrically connected by the current collecting member. That is, the first electrode uncoated portion 21b of the first electrode assembly 120a and the second electrode assembly 120b is electrically connected by the first current collecting member 140, and the first electrode assembly 120a and the first electrode assembly 120a are electrically connected to each other. The second electrode uncoated portion 22b of the two electrode assembly 120b is electrically connected by the second current collecting member 142.
이때, 제1 전극 조립체(120a)의 제1 전극 무지부(21b)와 제2 전극 조립체(120b)의 제1 전극 무지부(21b)는 서로 마주보는 방향으로 절곡되고, 제1 전극 조립체(120a)의 제2 전극 무지부(22b)와 제2 전극 조립체(120b)의 제2 전극 무지부(22b)는 서로 마주보는 방향으로 절곡되어 있다. 따라서, 각각의 전극 무지부(21b, 22b)는 전극 활성부의 금속 포일과 연결되어 캡 조립체 방향으로 돌출된 제1 무지부(21b1), 제1 무지부로부터 연장되며 집전 부재(140, 142)와 접촉하는 일면을 가지는 제2 무지부(21b2)를 가질 수 있다. At this time, the first electrode uncoated portion 21b of the first electrode assembly 120a and the first electrode uncoated portion 21b of the second electrode assembly 120b are bent in a direction facing each other, and the first electrode assembly 120a The second electrode uncoated portion 22b of) and the second electrode uncoated portion 22b of the second electrode assembly 120b are bent in a direction facing each other. Accordingly, each of the electrode plain portions 21b and 22b is connected to the metal foil of the electrode active portion, and extends from the first plain portion 21b1 and the first plain portion to protrude in the direction of the cap assembly. It may have a second uncoated portion (21b2) having one surface in contact.
제1 집전 부재(140)의 일면(상대적으로 캡플레이트와 가까운 면)과 제2 무지부(21b2)의 일면(상대적으로 집전체와 가까운 면)이 접촉하여 전기적으로 연결되고, 제2 집전 부재(142)의 일면(상대적으로 캡플레이트와 가까운 면)과 제2 무지부(22b2)의 일면(상대적으로 집전체와 가까운 면)이 접촉하여 전기적으로 연결될 수 있다.One surface (relatively close to the cap plate) of the first current collecting member 140 and one surface (relatively close to the current collector) of the second uncoated portion 21b2 are in contact with each other and electrically connected to each other. One surface (relatively close to the cap plate) of 142 and one surface (relatively close to the current collector) of the second uncoated portion 22b2 may be electrically contacted with each other.
제1 집전 부재(140)는 대략 사각형의 판상으로, 관통 구멍(6) 및 퓨즈(7)를 가진다. The first current collecting member 140 has a substantially rectangular plate shape and has a through hole 6 and a fuse 7.
퓨즈(7)는 제1 집전 부재(140)의 다른 부분보다 두께가 얇은 부분으로, 일정 온도 이상으로 상승할 경우 용융되어 끊어진다. 따라서 이차 전지가 오작동 등으로 인한 발열이 발생할 경우, 퓨즈(7)가 끊어져 추가적으로 이차 전지가 가열되는 것을 방지하므로 가열로 인해서 전지가 폭발하는 것을 방지한다.The fuse 7 is a thinner portion than the other portion of the first current collecting member 140, and when the fuse 7 rises above a predetermined temperature, the fuse 7 melts and blows off. Therefore, when the secondary battery generates heat due to a malfunction or the like, the fuse 7 is blown to further prevent the secondary battery from being heated, thereby preventing the battery from being exploded due to the heating.
제1 집전 부재(140)의 관통 구멍(6)에는 제1 실링 가스킷(62)과 함께 보조 단자(200)가 삽입되어 있다. The auxiliary terminal 200 is inserted into the through hole 6 of the first current collecting member 140 together with the first sealing gasket 62.
보조 단자(200)의 일단은 제1 집전 부재(140)에 삽입되고 타단은 캡 플레이트(31)에 용접으로 고정되어 있다. 제1 실링 가스킷(62)은 보조 단자(200)와 제1 집전 부재(140)에 밀착되며, 보조 단자(200)를 관통 구멍(6)에 고정시킨다. One end of the auxiliary terminal 200 is inserted into the first current collecting member 140 and the other end is fixed to the cap plate 31 by welding. The first sealing gasket 62 is in close contact with the auxiliary terminal 200 and the first current collecting member 140, and fixes the auxiliary terminal 200 to the through hole 6.
제1 집전 부재(140)와 전극 조립체(120) 사이의 제1 집전 부재(140)의 하면에는 저항 부재(80)가 위치한다. 저항 부재(80)는 제1 집전 부재(140)보다 높은 저항값을 가질 수 있으며, 예를 들어 제1 집전 부재가 알루미늄일 경우 저항 부재(80)는 알루미늄보다 높은 저항값을 가지는 물질일 수 있다. The resistance member 80 is positioned on the bottom surface of the first current collecting member 140 between the first current collecting member 140 and the electrode assembly 120. The resistance member 80 may have a higher resistance value than the first current collector member 140. For example, when the first current collector member is aluminum, the resistance member 80 may be a material having a higher resistance value than aluminum. .
저항 부재(80)는 관통 구멍(6)과 연결되는 삽입 구멍(8)을 가지고, 관통 구멍(6)을 통과한 보조 단자(200)의 일단은 삽입 구멍(8)에 삽입된다. 이때, 보조 단자(200)의 하부 직경은 삽입 구멍(8)의 직경과 같거나, 저항 부재(80)의 탄성 정도에 따라서 약간 크게 형성될 수 있다. 즉, 저항 부재(80)의 탄성에 의해서 보조 단자(200)는 삽입 구멍(8)의 측벽에 밀착되어 있다. The resistance member 80 has an insertion hole 8 connected to the through hole 6, and one end of the auxiliary terminal 200 passing through the through hole 6 is inserted into the insertion hole 8. In this case, the lower diameter of the auxiliary terminal 200 may be equal to the diameter of the insertion hole 8 or may be slightly larger depending on the elasticity of the resistance member 80. That is, the auxiliary terminal 200 is in close contact with the side wall of the insertion hole 8 by the elasticity of the resistance member 80.
이처럼, 보조 단자(200)는 용접으로 캡 플레이트(31)와 전기적으로 연결되고, 제1 실링 가스킷(62) 및 저항 부재(80)에 의해서 제1 집전 부재(140)와는 절연되거나 상대적으로 높은 저항 상태를 유지한다. As such, the auxiliary terminal 200 is electrically connected to the cap plate 31 by welding, and is insulated from the first current collecting member 140 by the first sealing gasket 62 and the resistance member 80 or has a relatively high resistance. Maintain state.
다시, 도 1 내지 3을 참조하면, 케이스(27)는 대략 직육면체로 이루어지며, 일면에는 개방된 개구가 형성된다. 케이스(27)는 알루미늄, 스테인리스 스틸 등의 금속으로 이루어질 수 있다. Again, referring to FIGS. 1 to 3, the case 27 is formed of an approximately rectangular parallelepiped, and an opening is formed in one surface thereof. The case 27 may be made of metal such as aluminum or stainless steel.
캡 조립체(30)는 케이스(27)의 개구를 덮는 캡 플레이트(31)와 캡 플레이트(31) 위에 위치하며, 제1 전극(121)과 전기적으로 연결된 제1 단자(50)와 제2 전극(122)과 전기적으로 연결된 제2 단자(52)를 포함한다.The cap assembly 30 is positioned on the cap plate 31 and the cap plate 31 covering the opening of the case 27, and includes a first terminal 50 and a second electrode electrically connected to the first electrode 121. And a second terminal 52 electrically connected with 122.
캡 플레이트(31)는 일방향으로 이어진 길쭉한 판 형태로 이루어지며, 케이스(27)의 개구에 결합된다. 캡 플레이트(31)는 케이스(27)와 동일한 재질로 형성될 수 있으며, 레이저 용접 방식으로 케이스(27)에 결합될 수 있다. 따라서 캡 플레이트(31)는 케이스(27)와 전기적으로 연결될 수 있다.The cap plate 31 is formed in the form of an elongated plate extending in one direction and is coupled to the opening of the case 27. The cap plate 31 may be formed of the same material as the case 27 and may be coupled to the case 27 by a laser welding method. Therefore, the cap plate 31 may be electrically connected to the case 27.
캡 플레이트(31)는 전해액을 주입하기 위한 전해액 주입구(32) 및 연결 단자(250)가 삽입되는 단자 구멍(5)을 가진다. 그리고 설정된 압력에서 개방될 수 있도록 노치(2)가 형성된 벤트 플레이트(39)가 벤트 구멍(34)에 설치되어 있다. 전해액 주입구(32)에는 밀봉 마개(38)가 설치되어 있으며, 단자 구멍(5)에는 연결 단자(250)가 삽입되어 있다. The cap plate 31 has an electrolyte injection hole 32 for injecting electrolyte and a terminal hole 5 into which the connection terminal 250 is inserted. And the vent plate 39 in which the notch 2 was formed so that it may open at a set pressure is provided in the vent hole 34. As shown in FIG. The sealing plug 38 is provided in the electrolyte injection port 32, and the connecting terminal 250 is inserted into the terminal hole 5.
제1 단자(50) 및 제2 단자(52)는 직사각형의 판 형상으로 각각 연결 단자(250)에 결합되어 있다. 제 1 단자(50) 및 제2 단자(52)는 각각 제1 절연 부재(60)를 사이에 두고 캡 플레이트(31) 위에 위치하며, 제1 절연 부재(60)는 각각 제1 단자(50) 및 제2 단자(52)의 측면을 감싸도록 형성된다. 제1 단자(50) 및 제2 단자(52)는 외부 기기와 전기적으로 연결하기 위해서 제1 단자(50) 및 제2 단자(52)의 상면만 외부로 노출될 수 있다. The first terminal 50 and the second terminal 52 are respectively coupled to the connection terminal 250 in a rectangular plate shape. The first terminal 50 and the second terminal 52 are respectively positioned on the cap plate 31 with the first insulating member 60 interposed therebetween, and the first insulating member 60 is each the first terminal 50. And a side surface of the second terminal 52. In order to electrically connect the first terminal 50 and the second terminal 52, only upper surfaces of the first terminal 50 and the second terminal 52 may be exposed to the outside.
제1 단자(50)는 제1 집전부재(140)를 매개로 제1 전극(121)과 전기적으로 연결되며, 제2 단자(52)는 제2 집전부재(142)를 매개로 제2 전극(122)과 전기적으로 연결된다. 이때, 제1 단자(50)와 제2 단자(52)가 연결 단자를 통해서 각각 제1 집전 부재(140) 및 제2 집전 부재(142)에 연결되는 구성은 동일하므로, 이하에서는 제1 단자(50)를 중심으로 설명한다. The first terminal 50 is electrically connected to the first electrode 121 through the first current collecting member 140, and the second terminal 52 is connected to the second electrode via the second current collecting member 142. 122) is electrically connected. In this case, since the first terminal 50 and the second terminal 52 are connected to the first current collecting member 140 and the second current collecting member 142 through connection terminals, respectively, the first terminal ( The explanation will be given based on 50).
연결 단자(250)는 기둥 형상으로 이루어지며 캡 플레이트(31), 제1 절연 부재(60) 및 제1 단자(50)를 관통하여 설치되어, 제1 단자(50)와 제1 집전 부재(140)를 전기적으로 연결한다. The connection terminal 250 has a columnar shape and is installed through the cap plate 31, the first insulating member 60, and the first terminal 50, so that the first terminal 50 and the first current collecting member 140 are provided. ) Is electrically connected.
연결 단자(250)의 상단은 제1 단자(50)에 단자 구멍(4)에 끼워진 상태로 용접되어 제1 단자(50)에 고정될 수 있다. 그리고 연결 단자(250)의 하단은 제1 집전 부재(140)에 용접으로 고정된다. 이때, 제1 집전 부재(140)의 상면과 연결 단자(250)의 하면이 접촉하여 용접될 수 있으며, 접촉 면적을 증가시키기 위해서 연결 단자(250)의 하단은 상단에 비해서 넓은 폭일 수 있다. An upper end of the connection terminal 250 may be welded to the first terminal 50 while being inserted into the terminal hole 4 to be fixed to the first terminal 50. The lower end of the connection terminal 250 is fixed to the first current collecting member 140 by welding. In this case, the upper surface of the first current collecting member 140 and the lower surface of the connection terminal 250 may be contacted and welded, and in order to increase the contact area, the lower end of the connection terminal 250 may have a wider width than the upper end.
따라서 제1 전극(121)은 제1 집전 부재(140) 및 연결 단자(250)를 통해서 제1 단자(50)와 전기적으로 연결될 수 있다.Therefore, the first electrode 121 may be electrically connected to the first terminal 50 through the first current collecting member 140 and the connection terminal 250.
연결 단자(250)는 캡 플레이트(31)의 단자 구멍(5)을 통과하여 케이스(27)의 내부로부터 외부로 돌출되도록 설치되므로, 제2 실링 가스킷(63)을 설치하여 연결 단자(250)와 캡 플레이트(31) 사이를 밀봉시킨다. Since the connection terminal 250 is installed to pass through the terminal hole 5 of the cap plate 31 to protrude from the inside of the case 27 to the outside, a second sealing gasket 63 is installed to connect the connection terminal 250 with the connection terminal 250. Seal between the cap plates 31.
제2 실링 가스킷(63)은 캡 플레이트의 단자 구멍(5)뿐 아니라, 연결 단자(250)의 하부를 감싸도록 형성될 수 있다. 제2 실링 가스킷(63)은 캡 플레이트의 단자 구멍(5)을 밀봉시키면서 연결 단자(250)의 하부를 감싸 노출시키지 않으므로 캡 플레이트(31)와 연결 단자(250)가 단락되는 것을 방지할 수 있다. The second sealing gasket 63 may be formed to surround the lower portion of the connection terminal 250 as well as the terminal hole 5 of the cap plate. Since the second sealing gasket 63 does not expose the lower portion of the connection terminal 250 while sealing the terminal hole 5 of the cap plate, the second sealing gasket 63 may prevent the cap plate 31 and the connection terminal 250 from being short-circuited. .
또한, 연결 단자(250)의 하부가 다른 부분보다 확장된 폭을 가지고, 이를 감싸도록 제2 실링 가스킷(63)을 설치하면, 제2 실링 가스킷(63)은 단자 구멍(5)에 삽입되는 제1 부분(63a), 캡 플레이트(31)와 연결 단자(250) 사이에 위치하는 제2 부분(63b), 캡 플레이트(31)와 제1 집전 부재(140) 사이에 위치하는 제3 부분(63c)을 포함한다. In addition, when the lower portion of the connection terminal 250 has an expanded width than other portions and the second sealing gasket 63 is installed to surround the second sealing gasket 63, the second sealing gasket 63 is inserted into the terminal hole 5. One portion 63a, a second portion 63b positioned between the cap plate 31 and the connection terminal 250, and a third portion 63c positioned between the cap plate 31 and the first current collecting member 140; ).
제2 실링 가스킷(63)의 제1 부분(63a)과 제2 부분(63b)은 캡 플레이트(31)와 연결 단자(250)가 단락 되는 것을 방지하고, 제3 부분(63c)은 캡 플레이트(31)와 제1 집전 부재(140) 사이의 간격을 일정하게 유지하여 이들이 단락되는 것을 방지할 수 있다. The first portion 63a and the second portion 63b of the second sealing gasket 63 prevent the cap plate 31 and the connection terminal 250 from being shorted, and the third portion 63c includes the cap plate ( 31 may be kept constant between the first current collecting member 140 to prevent them from being shorted.
제2 단자(52)도 제1 단자(50)와 같이 단자 구멍(5, 9)에 삽입된 연결 단자(250)와 제2 집전 부재(142)를 통해서 제2 전극(122)과 전기적으로 연결된다. The second terminal 52 is also electrically connected to the second electrode 122 through the connection terminal 250 and the second current collecting member 142 inserted into the terminal holes 5 and 9, like the first terminal 50. do.
제2 실링 가스킷(63)은 단자 구멍(5)뿐 아니라, 연결 단자(250)의 하부를 감싸도록 형성된다. 이처럼, 제1 단자(50) 및 제2 단자(52)는 각각 측면을 감싸는 제1 절연 부재(60)를 사이에 두고 캡 플레이트(31)와 중첩하고, 연결 단자(250)는 제2 실링 가스킷(63)으로 둘러싸여 있어 캡 플레이트(31)를 포함하는 케이스(27)는 어떠한 극성으로도 대전되지 않은 중성 상태이다.The second sealing gasket 63 is formed to surround the lower portion of the connection terminal 250 as well as the terminal hole 5. As such, the first terminal 50 and the second terminal 52 overlap the cap plate 31 with the first insulating member 60 surrounding the side, respectively, and the connecting terminal 250 is the second sealing gasket. Surrounded by 63 and the case 27 including the cap plate 31 is a neutral state that is not charged with any polarity.
본 발명의 일 실시예에서와 같이, 중성 케이스를 포함하는 이차 전지에 보조 단자(200)를 형성하면, 관통 충격 또는 관통 실험시 용이하게 단락 경로를 형성할 수 있다. As in the exemplary embodiment of the present invention, when the auxiliary terminal 200 is formed in the secondary battery including the neutral case, a short circuit path may be easily formed during a penetration shock or a penetration test.
관통이 발생하지 않는 정상 상태에서, 전극 조립체(120)의 제1 전극(121)은 제1 집전 부재(140), 연결 단자(250) 및 제1 단자(50)가 전기적으로 연결되고, 제2 전극(122)은 제2 집전 부재(142), 연결 단자(250) 및 제2 단자(52)가 전기적으로 연결되어 전류가 흐른다.In a normal state in which no penetration occurs, the first electrode 121 of the electrode assembly 120 is electrically connected to the first current collecting member 140, the connection terminal 250, and the first terminal 50. In the electrode 122, the second current collecting member 142, the connection terminal 250, and the second terminal 52 are electrically connected to each other so that a current flows.
전류는 저항이 낮은 부분으로 흐르는데, 제1 집전 부재(140)에 설치되는 보조 단자(200)는 제1 실링 가스킷(62) 및 저항 부재(80)에 의해서 제1 집전 부재(140)와는 절연되거나, 전류 경로에 상대적으로 높은 저항의 저항 부재(80)가 위치하여 전류는 상대적으로 저항이 낮은 제1 집전 부재(140) 및 연결 단자(250)를 통해서 제1 단자(50)로 흐르게 된다. The current flows to a portion of low resistance, and the auxiliary terminal 200 installed in the first current collecting member 140 is insulated from the first current collecting member 140 by the first sealing gasket 62 and the resistance member 80. The resistance member 80 having a relatively high resistance is positioned in the current path so that current flows to the first terminal 50 through the first current collecting member 140 and the connection terminal 250 having a relatively low resistance.
반면, 관통 실험 등으로 관통 네일에 의해서 이차 전지가 관통될 경우, 전극 조립체 내부는 단락되어 전극 조립체(120), 관통 네일(도시하지 않음) 케이스(27), 보조 단자(200), 저항 부재(80) 및 제1 집전 부재(140)가 연결되어 전류가 제거된다. 따라서 이상 전류 발생으로 인한 폭발 위험을 줄일 수 있다. On the other hand, when the secondary battery is penetrated by the penetrating test due to the penetrating experiment, the inside of the electrode assembly is short-circuited to form the electrode assembly 120, the penetrating nail (not shown) case 27, the auxiliary terminal 200, and the resistance member ( 80 and the first current collecting member 140 are connected to remove current. Therefore, the risk of explosion due to abnormal current generation can be reduced.
이상 본 발명의 바람직한 일 실시예에 대하여 설명하였지만, 본 발명이 이에 한정되는 것은 아니며 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시할 수 있다.While a preferred embodiment of the present invention has been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings.

Claims (9)

  1. 제1 전극, 세퍼레이터 및 제2 전극을 가지는 전극 조립체,An electrode assembly having a first electrode, a separator, and a second electrode,
    상기 전극 조립체를 수용하며 개구를 가지는 케이스,A case accommodating the electrode assembly and having an opening,
    상기 개구를 통해 결합되어 상기 케이스를 밀봉하는 캡 조립체,A cap assembly coupled through the opening to seal the case;
    상기 제1 전극 및 상기 제2 전극과 각각 전기적으로 연결되는 제1 집전 부재 및 제2 집전 부재,A first current collecting member and a second current collecting member electrically connected to the first electrode and the second electrode, respectively;
    상기 캡 플레이트 위에 위치하며 상기 제1 집전 부재 및 상기 제2 집전 부재와 각각 전기적으로 연결되는 제1 단자 및 제2 단자,First and second terminals positioned on the cap plate and electrically connected to the first current collecting member and the second current collecting member, respectively;
    상기 제1 집전 부재와 중첩하며 삽입 구멍을 가지는 저항 부재,A resistance member overlapping the first current collecting member and having an insertion hole;
    상기 제1 집전 부재의 관통 구멍에 설치되는 제1 가스킷,A first gasket installed in the through hole of the first current collecting member;
    상기 제1 가스킷에 삽입되며 상기 삽입 구멍에 일단이 삽입되는 보조 단자를 포함하고, An auxiliary terminal inserted into the first gasket and having one end inserted into the insertion hole;
    상기 보조 단자의 타단은 상기 캡 조립체와 연결되는 이차 전지.The other end of the auxiliary terminal is connected to the cap assembly.
  2. 제1항에서,In claim 1,
    상기 제1 집전 부재의 일면에 연결되며 상기 캡 플레이트 및 상기 제1 전극을 관통하여 설치되는 제1 연결 단자,A first connection terminal connected to one surface of the first current collecting member and installed through the cap plate and the first electrode;
    상기 제2 집전 부재의 일면에 연결되며 상기 캡 플레이트 및 상기 제2 전극을 관통하여 설치되는 제2 연결 단자A second connection terminal connected to one surface of the second current collecting member and penetrating the cap plate and the second electrode;
    를 포함하고,Including,
    상기 제1 연결 단자 및 제2 연결 단자는 제1 폭을 가지며 상기 캡 플레이트를 통과하는 상단부, 상기 제1 폭보다 넓은 폭의 제2 폭을 가지며 상기 일면에 연결되는 하단부를 포함하는 이차 전지.The first connection terminal and the second connection terminal has a first width and a second battery passing through the cap plate, a secondary battery having a second width of a wider than the first width and a lower end connected to the one surface.
  3. 제2항에서,In claim 2,
    상기 상단부는 제2 가스킷을 통해서 상기 캡 플레이트의 단자 구멍에 삽입되는 이차 전지.The upper end portion is inserted into the terminal hole of the cap plate through a second gasket.
  4. 제3항에서,In claim 3,
    상기 제2 가스킷은 상기 하단부의 모서리를 감싸도록 형성되는 이차 전지.The second gasket is formed to surround the edge of the lower end.
  5. 제4항에서,In claim 4,
    상기 제2 가스킷은 상기 단자 구멍에 삽입되는 제1 부분, 상기 캡 플레이트와 상기 하단부 사이에 위치하는 제2 부분, 상기 캡 플레이트와 상기 제1 집전 부재 사이에 위치하는 제3 부분을 포함하는 이차 전지.The second gasket includes a first portion inserted into the terminal hole, a second portion located between the cap plate and the lower end portion, and a third portion located between the cap plate and the first current collecting member. .
  6. 제1항에서,In claim 1,
    상기 케이스는 중성 상태인 이차 전지.The case is a secondary battery in a neutral state.
  7. 제1항에서,In claim 1,
    상기 저항 부재는 상기 제1 집전 부재의 저항보다 높은 저항을 가지는 물질로 이루어지는 이차 전지.The resistance member is made of a material having a higher resistance than the resistance of the first current collecting member.
  8. 제7항에서,In claim 7,
    상기 제1 집전 부재는 알루미늄으로 이루어지는 이차 전지.The secondary current collector is made of aluminum.
  9. 제1항에서,In claim 1,
    상기 제1 집전 부재는 퓨즈를 더 포함하고,The first current collecting member further includes a fuse,
    상기 퓨즈는 상기 제1 집전 부재의 다른 부분보다 상대적으로 두께가 얇은 부분인 이차 전지.The fuse is a portion that is relatively thinner than other portions of the first current collecting member.
PCT/KR2017/007110 2016-07-15 2017-07-04 Rechargeable battery WO2018012788A1 (en)

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