KR20080082290A - Prismatic type lithium secondary battery - Google Patents

Prismatic type lithium secondary battery Download PDF

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Publication number
KR20080082290A
KR20080082290A KR1020070022955A KR20070022955A KR20080082290A KR 20080082290 A KR20080082290 A KR 20080082290A KR 1020070022955 A KR1020070022955 A KR 1020070022955A KR 20070022955 A KR20070022955 A KR 20070022955A KR 20080082290 A KR20080082290 A KR 20080082290A
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secondary battery
electrode assembly
lithium secondary
insulating case
electrode
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KR1020070022955A
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Korean (ko)
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유민정
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삼성에스디아이 주식회사
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Priority to KR1020070022955A priority Critical patent/KR20080082290A/en
Publication of KR20080082290A publication Critical patent/KR20080082290A/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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

A prismatic lithium secondary battery is provided to prevent the percent defective due to the up/down flowing of an electrode assembly inside a can, thereby lowering the manufacturing cost of a battery. A prismatic lithium secondary battery comprises a jelly-roll type electrode assembly which two different electrodes and a separator interposed between the two electrodes; a can where the electrode assembly is accommodated; a cap assembly which is combined with the opened upper part of the can; and an insulating case(140) which is installed between the electrode assembly and the cap assembly, wherein a sealing material is coated on the external wall surface(144,146) of the insulating case to form a coating part(150) so as to allow the insulating case to be adhered closely to the internal wall surface of the can.

Description

각형 리튬 이차전지 {Prismatic type lithium secondary battery}Square type lithium secondary battery {Prismatic type lithium secondary battery}

도 1은 본 발명의 일 실시예에 의한 각형 리튬 이차전지의 분해사시도.1 is an exploded perspective view of a rectangular lithium secondary battery according to an embodiment of the present invention.

도 2는 본 발명의 일 실시예에 의한 절연케이스의 평면도.2 is a plan view of an insulating case according to an embodiment of the present invention.

도 3은 본 발명의 일 실시예에 의한 각형 리튬 이차전지의 단면도.3 is a cross-sectional view of a prismatic lithium secondary battery according to an embodiment of the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

100 ; 각형 리튬 이차전지100; Square Lithium Secondary Battery

110 ; 캔110; Cans

120 ; 전극조립체120; Electrode Assembly

130 ; 캡조립체130; Cap assembly

140 ; 절연케이스140; Insulation Case

141,142 ; (절연케이스의) 전극탭 관통공141,142; Electrode tab through hole (of insulated case)

144,146 ; (절연케이스의) 양측벽144,146; Both side walls (of insulated case)

150 ; 코팅층150; Coating layer

본 발명은 리튬 이차전지에 관한 것으로, 보다 상세하게는 각형 리튬 이차전 지의 캔 내부에 삽입되는 절연케이스를 구조를 개선한 각형 리튬 이차전지에 관한 것이다.The present invention relates to a lithium secondary battery, and more particularly, to a rectangular lithium secondary battery having an improved structure of an insulating case inserted into a can of a rectangular lithium secondary battery.

통상적으로, 이차전지(secondary battery)는 충전이 불가능한 일차전지와는 달리, 충전 및 방전이 가능한 전지를 말하는 것으로서, 셀룰라 폰, 노트북 컴퓨터, 캠코더 등의 첨단 전자기기 분야에서 널리 사용되고 있다. 특히, 리튬이차전지는 작동전압이 3.6V로서, 전자장비 전원으로 많이 사용되고 있는 니켈-카드뮴 전지나 니켈-수소 전지보다 3배나 높고, 단위중량당 에너지밀도가 높다는 측면에서 개발 및 보급이 급속도로 신장되고 있는 추세이다.In general, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in the field of advanced electronic devices such as a cellular phone, a notebook computer, a camcorder, and the like. In particular, the lithium secondary battery has an operating voltage of 3.6V, which is three times higher than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as power sources for electronic equipment, and rapidly develops and spreads in terms of high energy density per unit weight. There is a trend.

이러한 리튬이차전지는 주로 양극 활물질로 리튬계 산화물, 음극 활물질로는 탄소재를 사용하고 있다. 또한, 리튬이차전지는 여러가지 형상으로 제조되고 있는데, 대표적 형상으로는 원통형과, 각형과, 파우치형을 들 수 있다.Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. Moreover, although lithium secondary batteries are manufactured in various shapes, typical shapes include cylindrical shape, square shape, and pouch type.

이 중 각형 이차전지는 전극조립체와, 이 전극조립체를 수용하는 캔과, 이 캔의 상단 개구부에 결합되는 캡조립체를 포함하여 이루어진다.The rectangular secondary battery includes an electrode assembly, a can containing the electrode assembly, and a cap assembly coupled to an upper opening of the can.

상기 전극조립체는 양극판과 음극판 및 이들 두 전극판 사이에 세퍼레이터가 개재된 상태로 권취되어 있으며, 상기 양극판 및 음극판으로 부터 양극탭 및 음극탭이 각각 인출되어 있다.The electrode assembly is wound with a separator interposed between a positive electrode plate and a negative electrode plate and the two electrode plates, and a positive electrode tab and a negative electrode tab are drawn out from the positive electrode plate and the negative electrode plate, respectively.

상기 캔은 각형 이차전지에서 대략 직육면체의 형상을 가진 금속재질의 용기이며, 딥 드로잉(deep drawing) 등의 가공방법으로 형성한다.The can is a metal container having a substantially rectangular parallelepiped shape in a rectangular secondary battery, and is formed by a processing method such as deep drawing.

상기 캡조립체는 캔의 상단 개구부에 결합되는 캡플레이트와, 단자통공을 통하여 설치되고 그 외면에 캡플레이트와의 절연을 위한 가스켓이 위치하는 전극단자 와, 캡플레이트의 아랫면에 설치되는 절연플레이트와, 이 절연플레이트의 아랫면에 설치되어 전극단자와 통전되는 단자플레이트를 포함하여 이루어진다. The cap assembly may include a cap plate coupled to an upper opening of the can, an electrode terminal provided through a terminal hole, and a gasket for insulating the cap plate on an outer surface thereof, an insulating plate installed on a lower surface of the cap plate, It is provided on the bottom surface of the insulating plate and comprises a terminal plate for energizing the electrode terminal.

전극조립체의 한 전극은 전극탭과 단자플레이트를 통해 전극단자와 전기적으로 연결되고, 다른 전극은 이와 연결되는 전극탭을 통해 캡플레이트나 캔에 전기적으로 연결된다. 그리고, 단자플레이트의 하부에는 전극조립체와 캡조립체 사이를 절연하는 절연케이스가 설치된다.One electrode of the electrode assembly is electrically connected to the electrode terminal through the electrode tab and the terminal plate, and the other electrode is electrically connected to the cap plate or the can through the electrode tab connected thereto. In addition, an insulating case is installed below the terminal plate to insulate the electrode assembly from the cap assembly.

이와 같이 구성되어 조립되는 종래 각형 이차전지에서 캔 내부에 조립된 전극조립체의 상,하 유동을 방지하기 위하여 종래에는 캔 상단부에서 전극조립체의 직상부측에 별도로 비딩(beading)부를 형성하게 된다.In order to prevent the up and down flow of the electrode assembly assembled inside the can in the conventional rectangular secondary battery constructed and assembled as described above, a beading part is separately formed at the upper end of the electrode assembly at the upper end of the can.

그러나 이처럼 비딩부는 전극조립체가 캔 내부에 삽입된 상태에서 형성되기 때문에 정확한 위치에 가공하도록 효율적으로 관리하기도 어렵고, 원통형 전지가 아닌 각형 전지에서 비딩부를 형성하기 위해서는 추가 설비를 설치해야 하는 비용의 부담이 있다.However, since the bead portion is formed in the state where the electrode assembly is inserted into the can, it is difficult to efficiently manage the processing at the correct position, and the cost of additional equipment is required to form the bead portion in the rectangular battery instead of the cylindrical battery. have.

이와 같은 문제점을 감안하여 안출한 본 발명의 목적은 캔 내부에서 전극 조립체의 상,하 유동을 방지하기에 적합하도록 한 것이다.The object of the present invention devised in view of such a problem is to be suitable for preventing the up and down flow of the electrode assembly in the can.

본 발명의 다른 목적은 절연케이스에 의하여 전극조립체의 상,하 유동을 방지하여 제조비용을 절감하도록 한 것이다.Another object of the present invention is to prevent the up and down flow of the electrode assembly by the insulating case to reduce the manufacturing cost.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 의한 각형 리튬 이차전지 는 서로 다른 두 전극 및 이들 두 전극 사이에 개재된 세퍼레이터가 적층되어 권취된 전극조립체; 상기 전극조립체가 수용되는 캔;상기 캔의 개방된 상부와 결합되는 캡조립체; 및 상기 전극조립체와 상기 캡조립체 사이에 설치되는 절연케이스;를 포함하고, 상기 절연케이스의 외벽면에 실링재가 코팅된 코팅부가 형성되어 상기 캔의 내벽면에 상기 절연케이스를 밀착하도록 구성한 것을 특징으로 한다.According to the present invention, a rectangular lithium secondary battery according to the present invention includes an electrode assembly in which two different electrodes and a separator interposed between the two electrodes are stacked and stacked; A can assembly in which the electrode assembly is accommodated; a cap assembly coupled to an open upper portion of the can; And an insulating case installed between the electrode assembly and the cap assembly, wherein a coating part coated with a sealing material is formed on an outer wall surface of the insulating case so that the insulating case is in close contact with the inner wall surface of the can. do.

상기 코팅부는 상기 절연케이스의 외벽면중 장변방향으로 좌우 양측벽의 외주면에 형성된 것이 바람직하다.The coating part is preferably formed on the outer peripheral surface of the left and right side walls in the long side direction of the outer wall surface of the insulating case.

상기 코팅부는 고무인 것이 바람직하다.Preferably, the coating is rubber.

상기 코팅부는 수지인 것이 바람직하며, 이때, 수지는 합성수지로서, 아크릴, 우레탄 또는 실리콘 중 어느 하나를 사용할 수 있다.Preferably, the coating part is a resin, and in this case, the resin may be any one of acrylic, urethane, or silicone as a synthetic resin.

이하에서, 첨부된 도면을 참조하면서 본 발명에 따른 이차전지에 관한 바람직한 실시예를 상세하게 설명하고자 한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a secondary battery according to the present invention.

도 1 은 본 발명의 일 실시예에 따른 이차전지를 나타내는 분해상태의 사시도이고, 도 2는 도 1의 절연케이스의 평면도이다.1 is a perspective view of an exploded state showing a secondary battery according to an embodiment of the present invention, Figure 2 is a plan view of the insulating case of FIG.

도 1 및 도 2에 도시한 바와 같이, 본 발명의 일 실시예에 따른 이차전지(100)는 캔(100)의 내부에 수납되는 전극조립체(120)와, 캔(100)에 전극조립체(120)가 수납된 상태에서 캔(100)의 상단 개구부에 결합되는 캡 조립체(130)와, 전극조립체(120)와 캡조립체(100) 사이에 개재되어 이들을 절연시키는 절연케이스(140)를 포함한다. As shown in FIG. 1 and FIG. 2, the secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 120 accommodated in the can 100 and an electrode assembly 120 in the can 100. ) And a cap assembly 130 coupled to the top opening of the can 100 in a state where it is received, and an insulating case 140 interposed between the electrode assembly 120 and the cap assembly 100 to insulate them.

전극조립체(120)는 통상 전기용량을 높이기 위해 양극판(121) 및 음극판(123)을 넓은 판형으로 형성한 뒤, 이들을 상호 절연시키는 세퍼레이터(122)를 양극판(121)과 음극판(123) 사이에 개재하여 적층하고, 와형으로 권취하여 이른바 '젤리롤(Jelly Roll)' 형태로 만든다. 음극판(123) 및 양극판(121)은 각각 구리 및 알미늄 포일로 이루어진 집전체 각각에 음극 활물질인 탄소와 양극 활물질인 코발트산 리튬 등을 코팅시켜 형성할 수 있다. 세퍼레이터(122)는 폴리에틸렌, 폴리프로필렌, 또는 폴리에틸렌과 폴리프로필렌의 공중합체(co-polymer)로 이루어져 있다. 세퍼레이터(122)는 양극판(121) 및 음극판(123)보다 폭을 넓게 하여 형성하는 것이 극판 간의 단락을 방지하는 데 유리하다. 전극조립체(120)에는 각 전극과 연결된 양극탭 및 음극탭(124, 125)이 인출되어 있다. 상기 양극탭 및 음극탭(124, 125)에는 상기 전극조립체(120)의 외부로 인출되는 경계부에 극판(121, 123) 간의 단락을 방지하기 위하여 절연 테이프(126)가 감겨져 있다.The electrode assembly 120 typically forms a positive plate 121 and a negative plate 123 in a wide plate shape in order to increase capacitance, and then interposes a separator 122 between the positive plate 121 and the negative plate 123 to insulate them from each other. It is then laminated, rolled up into a vortex to form a so-called 'Jelly Roll'. The negative electrode plate 123 and the positive electrode plate 121 may be formed by coating carbon, which is a negative electrode active material, and lithium cobalt oxide, which is a positive electrode active material, on a current collector made of copper and aluminum foil, respectively. The separator 122 is made of polyethylene, polypropylene, or a copolymer of polyethylene and polypropylene. Separator 122 is formed to be wider than the positive electrode plate 121 and the negative electrode plate 123 is advantageous to prevent a short circuit between the electrode plates. In the electrode assembly 120, positive and negative electrode tabs 124 and 125 connected to each electrode are drawn out. Insulating tapes 126 are wound around the positive electrode tabs and the negative electrode tabs 124 and 125 to prevent a short circuit between the electrode plates 121 and 123 to be drawn out to the outside of the electrode assembly 120.

캔(110)은 도시된 바와 같은 각형 이차전지에서 대략 직육면체의 형상을 가진 금속재질의 용기이며, 딥 드로잉(deep drawing) 등의 가공방법으로 형성한다. 따라서 캔 자체가 단자역할을 수행하는 것도 가능하다. 캔을 이루는 재질로는 경량의 전도성 금속인 알루미늄 또는 알루미늄 합금이 바람직하다. 캔(110)은 전극조립체(120)와 전해액의 용기가 되고, 전극조립체(120)가 투입되도록 개방된 상부는 캡조립체(130)에 의해 봉해진다. The can 110 is a metal container having a substantially rectangular parallelepiped shape in the rectangular secondary battery as shown, and formed by a processing method such as deep drawing. It is therefore possible for the can itself to act as a terminal. The material constituting the can is preferably aluminum or an aluminum alloy, which is a lightweight conductive metal. The can 110 becomes a container of the electrode assembly 120 and the electrolyte solution, and the upper part opened to the electrode assembly 120 is sealed by the cap assembly 130.

캡조립체(130)는 캡플레이트(131)와, 전극단자(135)와, 절연플레이트(136)와, 단자플레이트(137)를 포함하여 이루어진다. 캡플레이트(131)에는 단자통 공(132)이 형성되어 있는데, 전극단자(135)가 그 외면에 캡플레이트(131)와의 절연을 위하여 가스켓(134)을 위치시킨 채 단자통공(132)을 관통하여 설치된다. 캡플레이트(131)의 아랫면에는 절연플레이트(136)가 설치되어 있고, 이 절연플레이트(136)의 아랫면에는 단자플레이트(137)가 설치되어 있다. 이 단자플레이트(137)에는 전극단자(135)의 하단부가 전기적으로 접속되어 있다. The cap assembly 130 includes a cap plate 131, an electrode terminal 135, an insulation plate 136, and a terminal plate 137. The cap plate 131 has a terminal hole 132 formed therein, and the electrode terminal 135 penetrates the terminal hole 132 with the gasket 134 positioned on the outer surface thereof to insulate the cap plate 131. Is installed. An insulating plate 136 is provided on the lower surface of the cap plate 131, and a terminal plate 137 is provided on the lower surface of the insulating plate 136. The lower end of the electrode terminal 135 is electrically connected to this terminal plate 137.

전극조립체(120)의 음극판(123)은 음극탭(125)과 단자플레이트(137)를 통하여 전극단자(135)와 전기적으로 연결되어 있다. 전극조립체(120)의 양극판(121)의 경우에는 양극탭(124)이 캡플레이트(131)나 캔(110)에 용접되어 있다. 한편, 극성을 달리하여 전지를 설계할 수도 있을 것이다.The negative electrode plate 123 of the electrode assembly 120 is electrically connected to the electrode terminal 135 through the negative electrode tab 125 and the terminal plate 137. In the case of the positive electrode plate 121 of the electrode assembly 120, the positive electrode tab 124 is welded to the cap plate 131 or the can 110. On the other hand, the battery may be designed by changing the polarity.

상기 단자플레이트(137)의 하부에는 절연케이스(140)가 설치되어 캡조립체(130)와 전극조립체(120) 사이를 절연시킨다.An insulating case 140 is installed below the terminal plate 137 to insulate the cap assembly 130 from the electrode assembly 120.

캡플레이트(131)의 일측에는 안전벤트(safety vent,139)가 형성되고, 타측에는 전해액주입공(133)이 형성되며, 전해액의 주입 후 상기 전해액주입공(133)을 밀폐시키는 마개(138)가 구비된다.A safety vent (139) is formed at one side of the cap plate 131, and an electrolyte injection hole 133 is formed at the other side, and a stopper 138 for sealing the electrolyte injection hole 133 after injection of an electrolyte solution. Is provided.

절연케이스(140)의 형상을 보다 상세하게 설명하면, 저부를 형성하는 플레이트(143)와 상기 플레이트(143)의 가장자리에서 상방으로 연장된 양측벽(144,146)을 구비하고, 상기 플레이트(143)에는 전극조립체에서 인출되는 전극탭들이 통과하는 전극탭 관통공(141,142)이 형성되어 있다. In more detail, the shape of the insulating case 140 is provided with a plate 143 forming a bottom portion and both side walls 144 and 146 extending upward from an edge of the plate 143. Electrode tab through holes 141 and 142 through which the electrode tabs drawn out from the electrode assembly pass are formed.

여기서 본 발명의 일 실시예에 의한 절연케이스(140)는 장변방향으로 좌우 양측벽(144,146)의 외주면에 실링을 실시하기 위한 합성수지 도료가 코팅되어 코팅 층(150)이 형성된다.Here, the insulating case 140 according to an embodiment of the present invention is coated with a synthetic resin coating for sealing on the outer circumferential surfaces of the left and right side walls 144 and 146 in the long side direction to form a coating layer 150.

상기 합성수지 도료는 아크릴계, 우레탄계 또는 실리콘계 등과 같이 유기용제에 녹여서 코팅된다. 특히 실리콘계의 녹는점은 1414℃이므로 주위 환경에 영향을 받지 않게 된다.The synthetic resin coating is coated by dissolving in an organic solvent, such as acrylic, urethane or silicone. In particular, since the melting point of the silicon-based 1414 ℃ is not affected by the environment.

상기 코팅층(150)은 합성수지 이외에 천연수지인 고무 등을 사용할 수 있으며 탄성을 갖는 다양한 물질이 포함되는 것으로, 그 재질을 한정할 필요는 없을 것이다.The coating layer 150 may be used in addition to synthetic resin, such as natural resin rubber, and includes a variety of materials having elasticity, it will not need to limit the material.

이와 같이 구성되는 본 발명에 의한 각형 리튬 이차전지의 작용을 도 3을 참조하여 설명한다.The operation of the square lithium secondary battery according to the present invention configured as described above will be described with reference to FIG. 3.

본 발명에 의한 전지의 조립순서는 캔(110)의 내부에 전극조립체(120)를 수용시키고, 상기 전극조립체(120)의 상부에 절연케이스(140)를 안착시킨다. 이때, 상기 절연케이스(140)의 좌우 양측벽의 외주면에 코팅된 코팅층(150)에 의해 절연케이스(140)는 캔(110)의 내벽면에 억지끼움식으로 밀착되어 전극조립체(120)의 상부에 안착된다. The assembly sequence of the battery according to the present invention accommodates the electrode assembly 120 in the can 110, and seats the insulating case 140 on the electrode assembly 120. At this time, the insulating case 140 is pressed against the inner wall surface of the can 110 by the coating layer 150 coated on the outer circumferential surfaces of the left and right side walls of the insulating case 140 to the top of the electrode assembly 120. Is seated on.

따라서 절연케이스(140)의 좌우 양측 외벽면에 형성된 코팅층(150)에 의해 절연케이스(140)와 캔(110)과의 틈새가 없는 상태로 밀착되어 고정되므로 절연케이스(140)에 의해 전극조립체(120)의 상,하 유동이 방지되는 것이다.Therefore, the electrode assembly is formed by the insulating case 140 because the insulating layer 140 is tightly fixed by the coating layer 150 formed on the left and right outer wall surfaces of the insulating case 140 without a gap between the insulating case 140 and the can 110. The up and down flow of 120 is to be prevented.

본 발명의 일 실시예에서는 절연케이스의 장변방향으로 좌우 양측벽의 외주면에 코팅층을 형성하였으나, 절연케이스의 전체 벽면중에서 일부 벽면의 외주면에 부분적으로 코팅층을 형성하더라도 캔의 내주면과 맞닿은 부위에서 코팅층에 의해 절연케이스가 캔의 내주면에 압입상태로 고정되므로 전극조립체의 유동을 방지하게 된다.In one embodiment of the present invention, the coating layer is formed on the outer circumferential surface of the left and right side walls in the long side direction of the insulating case, even though the coating layer is partially formed on the outer circumferential surface of some walls of the entire wall surface of the insulating case, the coating layer is in contact with the inner peripheral surface of the can. The insulating case is fixed to the inner circumferential surface of the can in a press-fit state to prevent the flow of the electrode assembly.

이후 조립이 완료된 캡조립체(130)를 캔(110)의 상단개구부에 결합고정하고 전해액을 주입하면 베어셀의 조립이 완료된다.After the assembly is completed, the cap assembly 130 is fixed and coupled to the upper opening of the can 110 and the electrolyte is injected, the assembly of the bare cell is completed.

이상에서 설명한 바와 같이, 본 발명에 의한 각형 리튬 이차전지는 캔 내부에서 전극조립체의 상부에 안착되는 절연케이스를 이용하여 전극조립체가 캔 내부에서 상하방향으로 유동되어 발생되는 불량을 방지할 수 있어 전지의 제조비용을 절감하는 효과가 있다.As described above, the prismatic lithium secondary battery according to the present invention can prevent the defect caused by the electrode assembly flows up and down in the can by using an insulating case seated on the upper portion of the electrode assembly in the can. It is effective to reduce the manufacturing cost of the.

Claims (5)

서로 다른 두 전극 및 이들 두 전극 사이에 개재된 세퍼레이터가 적층되어 권취된 전극조립체; 상기 전극조립체가 수용되는 캔; 상기 캔의 개방된 상부와 결합되는 캡조립체; 및 상기 전극조립체와 상기 캡조립체 사이에 설치되는 절연케이스;를 포함하고,An electrode assembly in which two different electrodes and a separator interposed between the two electrodes are stacked and wound; A can containing the electrode assembly; A cap assembly coupled to the open top of the can; And an insulating case installed between the electrode assembly and the cap assembly. 상기 절연케이스의 외벽면에 실링재가 코팅된 코팅부가 형성되어 상기 캔의 내벽면에 상기 절연케이스를 밀착하도록 구성한 것을 특징으로 하는 각형 리튬 이차전지.A coating part coated with a sealing material is formed on the outer wall surface of the insulating case, the prismatic lithium secondary battery, characterized in that configured to adhere the insulating case to the inner wall surface of the can. 제 1 항에 있어서,The method of claim 1, 상기 코팅부는 상기 절연케이스의 외벽면중 장변방향으로 좌우 양측벽의 외주면에 형성된 것을 특징으로 하는 각형 리튬 이차전지.The coating part is a rectangular lithium secondary battery, characterized in that formed on the outer peripheral surface of the left and right side walls in the long side direction of the outer wall surface of the insulating case. 제 1 항에 있어서,The method of claim 1, 상기 코팅부는 고무인 것을 특징으로 하는 각형 리튬 이차전지.The coated lithium secondary battery, characterized in that the coating portion is rubber. 제 1 항에 있어서,The method of claim 1, 상기 코팅부는 수지인 것을 특징으로 하는 각형 리튬 이차전지.The coated lithium secondary battery, characterized in that the resin. 제 4 항에 있어서,The method of claim 4, wherein 상기 수지는 합성수지로서, 아크릴, 우레탄 또는 실리콘 중 어느 하나인 것을 특징으로 하는 각형 리튬 이차전지.The resin is a synthetic resin, a rectangular lithium secondary battery, characterized in that any one of acrylic, urethane or silicone.
KR1020070022955A 2007-03-08 2007-03-08 Prismatic type lithium secondary battery KR20080082290A (en)

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