KR100502315B1 - Electrode assembly of cell - Google Patents

Electrode assembly of cell Download PDF

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Publication number
KR100502315B1
KR100502315B1 KR1019980012447A KR19980012447A KR100502315B1 KR 100502315 B1 KR100502315 B1 KR 100502315B1 KR 1019980012447 A KR1019980012447 A KR 1019980012447A KR 19980012447 A KR19980012447 A KR 19980012447A KR 100502315 B1 KR100502315 B1 KR 100502315B1
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KR
South Korea
Prior art keywords
electrode
tab
contact area
battery
assembly
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KR1019980012447A
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Korean (ko)
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KR19990079709A (en
Inventor
황이주
김현우
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삼성에스디아이 주식회사
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Priority to KR1019980012447A priority Critical patent/KR100502315B1/en
Publication of KR19990079709A publication Critical patent/KR19990079709A/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
    • H01M50/531—Electrode connections inside a battery casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B23K11/0026—Welding of thin articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded 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
    • H01M10/24—Alkaline accumulators
    • H01M10/28—Construction or manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/38—Conductors
    • 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

Abstract

적어도 한쌍의 전극과, 상기 전극중 적어도 하나의 전극에 전극봉에 의한 저항용접으로 접합되는 탭을 구비하여 된 전지의 전극조립체에 관한 것으로, 상기 전극봉과 탭 또는 전극과의 접촉면적보다 상기 탭과 전극의 접촉면적이 좁게 된 것을 특징이 있다. 이는 전극과 탭의 용접에 따른 신뢰성을 향상시킬 수 있다.An electrode assembly of a battery comprising at least one pair of electrodes and a tab bonded to at least one of the electrodes by an electrode rod, wherein the tab and the electrode are larger than the contact area between the electrode and the tab or the electrode. It is characterized by a narrow contact area. This can improve the reliability according to the welding of the electrode and the tab.

Description

전지의 전극조립체{Electrode assembly of cell}Electrode assembly of cell

본 발명은 전지에 관한 것으로, 더 상세하게는 전극과 탭의 결합구조가 개선된 전지에 관한 것이다.The present invention relates to a battery, and more particularly, to a battery having an improved coupling structure between an electrode and a tab.

통상적인 전지는 수산화니켈을 주성분으로 하는 양극과, 수소저장합금을 주성분으로 하는 음극의 가역적인 산화 환원 반응에 의해 에너지를 얻는다.Conventional batteries obtain energy by the reversible redox reaction of a cathode comprising nickel hydroxide as a main component and a cathode containing hydrogen storage alloy as a main component.

이러한 전지는 케이스의 내부에 전극 조립체가 장착되어 구성된 것으로, 이 전극조립체는 분리용 재료층(절연층)이 삽입된 반대 극성의 두 분리된 전극으로 이루어진다. 음전극은 압착 또는 접착방식으로 설계될 수 있는데, 이는 전기 화학적 활성 재료로 된 수소 혼합물 및 결합제가 도전성 다공성 기판의 각 면에 접착되어 이루어진다. 이와는 달리 상기 음전극과 양전극은 모두 소결방식으로 설계될 수도 있다. Such a battery is constructed by mounting an electrode assembly inside a case, and the electrode assembly is composed of two separate electrodes of opposite polarities in which a separating material layer (insulating layer) is inserted. The negative electrode can be designed by compression or adhesion, in which a hydrogen mixture and a binder of an electrochemically active material are adhered to each side of the conductive porous substrate. Alternatively, both the negative electrode and the positive electrode may be designed by a sintering method.

상술한 바와 같이 제조된 전극을 이용하여 전지를 제조하는 한 방법은 띠상의 음 및 양전극의 사이에 절연부재(separator)를 개재시키고 나선형으로 권취한 후 케이스의 내부에 삽입한 후 전해액을 주입하게 되는데, 전극에 대한 충전률을 높이기 위하여 전극을 이루는 집전체에 소정의 피치로 다수의 관통공을 형성하여 활물질을 충전율을 높이는 방안이 모색되어 왔다.One method of manufacturing a battery using the electrode prepared as described above is to insert an electrolyte after inserting a separator between a strip-shaped negative electrode and a positive electrode, spirally wound and inserting it into the case. In order to increase the filling rate of the electrode, a method of increasing the filling rate of the active material has been sought by forming a plurality of through holes at a predetermined pitch in the current collector constituting the electrode.

상술한 바와 같이 구성된 종래의 전극중 양전극은 도 1에 도시된 바와 같이 이 전류의 인출을 위하여 전지의 캡조립체(11)와 접속되는 탭(12)과 접합된다.As shown in FIG. 1, the positive electrode of the conventional electrode configured as described above is joined to the tab 12 connected to the cap assembly 11 of the battery for drawing out this current.

상기 양전극(21;이하 전극이라 약칭함)과 탭(12)의 접합은 도 2에 도시된 바와 같이 마주대하는 전극봉(30)(30')에 의해 저항용접에 의해 이루어진다.Bonding of the positive electrode 21 (hereinafter referred to as electrode) and the tab 12 is performed by resistance welding by facing electrodes 30 and 30 'as shown in FIG.

그런데, 상기와 같은 접합은 전극봉(30)(30')에 의해 탭(12)과 전극(21)에 공급되는 전류에 의해 탭(12)과 전극(21)간의 접촉저항에 의한 발열로 전극과 탭(12)의 접촉부(12a)를 녹여서 접합하게 되는데, 이 경우 전극(21) 또는 탭(12)과 전극봉간의 저항이 더 커지는 경우가 있어 탭과 전극사이의 용접이 원활하게 이루어지지 않은 문제점이 있다.However, the above-described bonding is performed by heat generated by contact resistance between the tab 12 and the electrode 21 by the current supplied to the tab 12 and the electrode 21 by the electrode rods 30 and 30 '. The contact portion 12a of the tab 12 is melted and bonded. In this case, the resistance between the electrode 21 or the tab 12 and the electrode may be increased, so that the welding between the tab and the electrode may not be performed smoothly. have.

이러한 현상은 전극(21)과 탭(12)의 접촉면적보다 전극봉(30)(30')과 탭(12) 또는 전극(21)의 접촉면적이 좁아 상대적으로 전극봉과 탭 및 전극 사이의 저항이 커지기 때문이다.The phenomenon is that the contact area between the electrodes 30 and 30 'and the tab 12 or the electrode 21 is narrower than the contact area between the electrode 21 and the tab 12, so that the resistance between the electrode and the tab and the electrode is relatively small. Because it grows.

본 발명은 상기 문제점을 해결하기 위하여 창출된 것으로, 전극과 탭과의 접촉면적을 줄여 저항을 크게 함으로써 용접에 따른 불량율을 줄일 수 있는 전지의 전극조립체를 제공함에 그 목적이 있다.The present invention has been made to solve the above problems, and an object thereof is to provide an electrode assembly of a battery which can reduce a defective rate due to welding by reducing the contact area between the electrode and the tab to increase the resistance.

상기 목적을 달성하기 위하여 본 발명은, 적어도 한쌍의 전극와, 상기 전극중 적어도 하나의 전극에 전극봉에 의한 저항용접으로 접합되는 탭을 구비하여 된 전지의 전극조립체에 있어서, 상기 전극봉과 탭 또는 전극과의 접촉면적보다 상기 탭과 전극의 접촉면적이 좁게 된 것을 특징으로 하는 전지의 전극조립체에 의해 달성될 수 있다.In order to achieve the above object, the present invention provides an electrode assembly of a battery provided with at least one pair of electrodes and a tab bonded to at least one of the electrodes by electrode welding. It can be achieved by the electrode assembly of the battery, characterized in that the contact area of the tab and the electrode than the contact area of the narrower.

본 발명에 있어서, 상기 전극과 탭의 접합부의 적어도 일측에 돌기부가 형성되어 이 돌기부의 단부가 접합되도록 함이 바람직하다.In the present invention, it is preferable that a protrusion is formed on at least one side of the junction of the electrode and the tab so that the end of the protrusion is joined.

이하 첨부된 도면을 참조하여 본 발명에 따른 한 바람직한 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

전지는 제1도에 도시된 바와 같이 케이스(13)의 내부에 전극 조립체(20)가장착되고 상기 케이스(13)의 상단에는 전극 조립체(30)로부터의 충방전을 위한 캡조립체(11)가 설치된다. As shown in FIG. 1, the battery assembly includes an electrode assembly 20 mounted inside the case 13 and a cap assembly 11 for charging and discharging from the electrode assembly 30 at an upper end of the case 13. Is installed.

상기 전극조립체(20)는 양전극(21)와, 음전극(32) 및 이들 사이에 개재되는 절연부재(23)가 롤상 또는 상기 양전극(21)과 음전극(22)가 교호적으로 위치되도록 감긴 것이다. 여기에서 상기 전극조립체의 전극 즉, 양전극(21)은 탭(40)에 의해 캡조립체(11)의 캡과 저항용접에 의해 접합된다.The electrode assembly 20 is a positive electrode 21, the negative electrode 32 and the insulating member 23 interposed therebetween is wound in a roll or the positive electrode 21 and the negative electrode 22 are alternately positioned. In this case, the electrode of the electrode assembly, that is, the positive electrode 21 is joined to the cap of the cap assembly 11 by the tab 40 by resistance welding.

상기 전극과 탭(40)의 저항용접은 도 3에 도시된 바와 같이 상호 대향되게 설치된 한쌍의 전극봉(30)(30')에 사이에 상호 접촉된 양전극(21)과 탭(40)이 위치된 상태에서 상기 전극봉(30)(30')에 의해 가압됨으로써 이루어진다. 한편 상술한 바와 같은 저항용접이 이루어지는 과정에서 상기 전극봉(30)(30')과 양전극(21) 및 탭(40)의 접촉면적은 전극과 탭(40)의 접촉면적 보다 상대적으로 좁게 형성된다.The resistance welding of the electrode and the tab 40 is a positive electrode 21 and the tab 40 is located between a pair of electrode rods 30, 30 'installed opposite to each other as shown in FIG. It is made by being pressed by the electrode rods 30 and 30 'in a state. Meanwhile, in the process of resistance welding as described above, the contact area between the electrode rods 30 and 30 ', the positive electrode 21 and the tab 40 is formed to be relatively narrower than the contact area between the electrode and the tab 40.

상기 전극봉(30)(30')과 양전극(21) 및 탭(40)의 접촉면적 보다 전극과 탭(40)의 접촉면적을 좁게 하기 위해서는 양전극 또는 탭의 접촉부을 엠보싱, 펀칭 또는 스크래칭(scratching)처리하여 돌출부(41)를 형성하고 이 돌출부의 단부가 접촉되도록 함이바람직하다. 상기 돌출부의 형성은 상술한 실시예에 의하 한정되지 않고 양전극과 탭의 접촉면적을 전극 또는 탭과 전극봉의 접촉면적을 좁게할 수 있는 구성이면 어느것이나 가능하다.In order to narrow the contact area between the electrode and the tab 40 than the contact area between the electrodes 30, 30 ', the positive electrode 21, and the tab 40, the contact portion of the positive electrode or the tab is embossed, punched, or scratched. To form the protrusions 41 and to make the ends of the protrusions contact. The protruding portion is not limited to the above-described embodiment, and may be any structure as long as the contact area between the positive electrode and the tab can be narrowed between the electrode or the tab and the electrode.

상술한 바와 같은 전극조립체는 양전극(21)과 탭(40)을 용접함에 있어서, 상기 전극봉(30)(30')과 탭(40) 또는 양전극(21)과의 저항보다 양전극과 탭(40)사이의 저항을 상대적으로크게 할 수 있으므로 전극과 전극봉 또는 탭과 전극봉 간의 발열량 보다 전극과 탭(40)의 발열량을 크게할 수 있으므로 발열량의 차이에 의한 용접불량을 불일 수 있다.The electrode assembly as described above, when welding the positive electrode 21 and the tab 40, the positive electrode and the tab 40 than the resistance between the electrode 30, 30 'and the tab 40 or the positive electrode 21 Since the resistance between the electrode can be made relatively large, the amount of heat generated by the electrode and the tab 40 can be greater than the amount of heat generated between the electrode and the electrode or the tab and the electrode.

이상에서 설명한 바와 같이 본 발명 전지의 전극조립체는 탭과 전극간의용접 불량을 줄임으로써 생산성의 향상을 도모할 수 있으며, 탭과 전극의 용접에 따른 신뢰성을 향상시킬 수 있다.As described above, the electrode assembly of the battery of the present invention can improve productivity by reducing welding defects between the tab and the electrode, and improve the reliability due to welding of the tab and the electrode.

본 발명은 도면에 도시된 실시예를 들어 설명하였으나 이는 예시적인 것에 불과하며 관련분야에 종사하는 통상의 지식을 가진자에 의해 본 발명의 기술적 범위내에서 변형 가능함은 물론이다. Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary and can be modified within the technical scope of the present invention by those skilled in the related art.

도 1은 일반적인 전지를 도시한 단면도,1 is a cross-sectional view showing a typical battery,

도 2는 종래의 전극과 탭이 용접되는 상태를 도시한 단면도,2 is a cross-sectional view showing a state in which a conventional electrode and the tab is welded,

도 3은 본 발명에 따른 전지 조립체의 전극과 탭이 용접되는 상태를 도시한 단면도.3 is a cross-sectional view showing a state in which the electrode and the tab of the battery assembly according to the present invention are welded.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

21; 양전극 30,30'; 전극봉21; Positive electrode 30,30 '; Electrode

40; 탭 41; 돌출부40; Tab 41; projection part

Claims (1)

적어도 한쌍의 전극과, 상기 전극 중 적어도 하나의 전극부재에 전극봉에 의한 저항용접으로 접합되는 탭을 구비하여 된 전지의 전극조립체에 있어서,In the electrode assembly of the battery provided with at least one pair of electrodes and a tab bonded to at least one electrode member of the electrode by resistance welding by an electrode rod, 상기 탭의 적어도 상기 전극과의 접합부에 돌기부가 형성되어 이 돌기부의 돌출된 단부가 상기 전극에 접합되도록 하고, 상기 전극봉이 상기 돌기부의 돌출된 단부 반대측에 접하도록 하여, 상기 탭과 전극의 접촉면적이 상기 전극봉과 탭과의 접촉면적보다 좁게 되도록 한 것을 특징으로 하는 전지의 전극 조립체.A protrusion is formed at the junction of the tab with at least the electrode so that the protruding end of the protruding portion is joined to the electrode, and the electrode rod is in contact with the opposite side of the protruding end of the protruding portion, so that the contact area between the tab and the electrode is reached. The electrode assembly of the battery, characterized in that it is narrower than the contact area between the electrode and the tab.
KR1019980012447A 1998-04-08 1998-04-08 Electrode assembly of cell KR100502315B1 (en)

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KR100502315B1 true KR100502315B1 (en) 2005-09-26

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
KR20210025849A (en) 2019-08-28 2021-03-10 주식회사 엘지화학 Method for manufacturing cylindrical secondary battery
KR20210034963A (en) 2019-09-23 2021-03-31 주식회사 엘지화학 Method for manufacturing cylindrical secondary battery

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KR20030003537A (en) * 2001-07-03 2003-01-10 현대자동차주식회사 Storage battery for Electric Auto and method for making the same

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JPH0982332A (en) * 1995-09-12 1997-03-28 Furukawa Battery Co Ltd:The Electrode plate for battery and manufacture thereof

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JPH0982332A (en) * 1995-09-12 1997-03-28 Furukawa Battery Co Ltd:The Electrode plate for battery and manufacture thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210025849A (en) 2019-08-28 2021-03-10 주식회사 엘지화학 Method for manufacturing cylindrical secondary battery
KR20210034963A (en) 2019-09-23 2021-03-31 주식회사 엘지화학 Method for manufacturing cylindrical secondary battery

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