KR100615153B1 - Lithium secondary battery - Google Patents

Lithium secondary battery Download PDF

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Publication number
KR100615153B1
KR100615153B1 KR1019990032579A KR19990032579A KR100615153B1 KR 100615153 B1 KR100615153 B1 KR 100615153B1 KR 1019990032579 A KR1019990032579 A KR 1019990032579A KR 19990032579 A KR19990032579 A KR 19990032579A KR 100615153 B1 KR100615153 B1 KR 100615153B1
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South Korea
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electrode assembly
pouch
lithium secondary
secondary battery
case
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KR1019990032579A
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Korean (ko)
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KR20010017194A (en
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김용삼
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삼성에스디아이 주식회사
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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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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 of a single cell or a single battery
    • 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
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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

양극판과 음극판 및 세퍼레이터가 적층되어 이루어진 전극조립체와, 전극조립체를 감싸서 밀봉하는 케이스를 포함하는 리튬 2차 전지에 있어서, 케이스는 전극조립체의 일부를 수용하도록 일면으로부터 소정깊이 인입형성된 제1파우치를 가지는 전면벽과, 전극조립체를 감싸서 밀봉하기 위해 제1파우치에 대응되도록 소정 깊이 인입형성된 제2파우치를 가지며 전면벽에 결합되는 후면벽을 포함하는 것을 특징으로 하는 리튬 2차 전지가 개시된다.In a lithium secondary battery comprising an electrode assembly formed by stacking a positive electrode plate, a negative electrode plate, and a separator, and a case enclosing and sealing the electrode assembly, the case has a first pouch formed with a predetermined depth pulled in from one surface to receive a portion of the electrode assembly. Disclosed is a lithium secondary battery comprising a front wall and a rear wall having a second pouch formed in a predetermined depth so as to correspond to the first pouch to surround and seal the electrode assembly.

Description

리튬 2차 전지{Lithium secondary battery}Lithium secondary battery

도 1은 종래의 리튬 2차 전지를 나타내 보인 개략적 분리사시도.1 is a schematic exploded perspective view showing a conventional lithium secondary battery.

도 2는 본 발명의 실시예에 따른 리튬 2차 전지를 나타내 보인 개략적 분리사시도.Figure 2 is a schematic exploded perspective view showing a lithium secondary battery according to an embodiment of the present invention.

도 3은 도 2에 도시된 리튬 2차 전지의 개략적 결합단면도.3 is a schematic cross-sectional view of the lithium secondary battery shown in FIG.

< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>

20..전극조립체 21..연결탭20. Electrode assembly 21. Connection tab

30..케이스 31..전면벽30. Case 31. Front wall

33..후면벽 31a,33a..제1, 제2파우치33. Rear wall 31a, 33a. 1st, 2nd pouch

40..단자40..Terminal

본 발명은 리튬 2차 전지에 관한 것으로, 상세하게는 케이스의 구조가 개선된 리튬 2차 전지에 관한 것이다.The present invention relates to a lithium secondary battery, and more particularly, to a lithium secondary battery having an improved structure of a case.

일반적으로 2차전지는 충방전이 가능한 전지로서, 니켈-카드늄전지(nikel cadium battery), 연축전지, 니켈 수소전지(nikel metal hydride battery), 리튬 이온전지(lithium ion battery), 리튬 폴리머 전지(lithium polymer battery), 금속 리튬 2차전지 등이 있다. In general, a secondary battery is a battery capable of charging and discharging, and is a nickel-caddium battery, a lead-acid battery, a nickel metal hydride battery, a lithium ion battery, and a lithium polymer battery. battery), metal lithium secondary batteries, and the like.

이중에서 상기 리튬 2차 전지는 니켈-카드늄(Ni-Cd) 전지나 니켈-수소(Ni-Mh) 전지에 비해 단위 중량당 에너지 밀도가 우수하다는 점에서 급속도로 신장되고 있다. 이러한 리튬 2차전지는 전해액의 종류에 따라 액체 전해질 전지와 고분자 전해질 전지로 분류할 수 있으며, 일반적으로는 액체 전해질을 사용하는 전지를 리튬-이온 전지, 고분자 전해질을 사용하는 전지를 리튬-폴리머 전지라고 한다.In particular, the lithium secondary battery is rapidly expanding in that the energy density per unit weight is superior to that of a nickel-cadmium (Ni-Cd) battery or a nickel-hydrogen (Ni-Mh) battery. The lithium secondary battery may be classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte. Generally, a battery using a liquid electrolyte is a lithium-ion battery and a battery using a polymer electrolyte is a lithium-polymer battery. do.

상기 리튬 2차 전지 중에서 리튬-폴리머 전지의 일예가 도 1에 도시되어 있다.An example of a lithium-polymer battery among the lithium secondary batteries is shown in FIG. 1.

도면을 참조하면, 리튬 2차 전지는 양극판, 음극판 및 세퍼레이터(seperater)가 적층되어 이루어진 전극조립체(11)와, 이 전극조립체(11)를 감싸서 밀봉하기 위한 케이스(10)를 구비한다. 상기 전극조립체(11)는 양극판 및 음극판에 마련된 연결탭(13a)에 의해 전극탭(13)에 연결되며, 이 전극탭(13)은 외부와의 전기적 통로 역할을 하도록 케이스(10)의 밖으로 소정 길이 노출된다. 상기 케이스(10)는 전극조립체(11)를 수용하도록 일면으로 몰입된 파우치(pouch, 15a)를 가지는 전면벽(15)과, 상기 파우치(15a)를 덮도록 전면벽(15)에 결합되어 전극조립체(11)를 밀봉시키는 후면벽(17)을 구비한다.Referring to the drawings, the lithium secondary battery includes an electrode assembly 11 formed by stacking a positive electrode plate, a negative electrode plate, and a separator, and a case 10 for wrapping and sealing the electrode assembly 11. The electrode assembly 11 is connected to the electrode tab 13 by connection tabs 13a provided on the positive electrode plate and the negative electrode plate, and the electrode tab 13 is predetermined out of the case 10 to serve as an electrical passage to the outside. The length is exposed. The case 10 is coupled to the front wall 15 to cover the pouch 15a and the front wall 15 having a pouch 15a immersed in one surface to accommodate the electrode assembly 11. It has a back wall 17 that seals the assembly 11.

그런데, 상기와 같은 구성을 가지는 종래의 리튬 2차 전지는 상기 파우치(15a)가 전면벽(15)에만 형성되어 있고, 그 깊이에도 한계가 있기 때문에 두께가 얇은 소용량의 전극조립체(11)를 수용하여 휴대폰용 등으로 사용되었다. 따라 서, 상기와 같은 구성의 리튬 2차 전지는 대용량을 위해 두께가 두꺼운 전극조립체가 채용되는 예컨대, 노트북 컴퓨터 또는 전기자동차용 전지로는 사용할 수 없다는 단점이 있다.However, in the conventional lithium secondary battery having the above-described configuration, since the pouch 15a is formed only on the front wall 15, and the depth thereof is limited, the lithium secondary battery accommodates the small-capacity electrode assembly 11 having a small thickness. It was used for cell phones. Therefore, the lithium secondary battery having the above configuration has a disadvantage in that it cannot be used as a battery for a notebook computer or an electric vehicle, for example, in which a thick electrode assembly is adopted for a large capacity.

본 발명은 상기와 같은 문제점을 해결하기 위해 창안된 것으로, 대용량의 전극조립체를 수용하여 밀봉시킬 수 있도록 구조가 개선된 리튬 2차 전지를 제공하는데 그 목적이 있다.The present invention was devised to solve the above problems, and an object thereof is to provide a lithium secondary battery having an improved structure to accommodate and seal a large electrode assembly.

상기 목적을 달성하기 위한 본 발명에 따른 리튬 2차 전지는, 양극판과 음극판 및 세퍼레이터가 적층되어 이루어진 전극조립체와, 상기 전극조립체를 감싸서 밀봉하는 케이스를 포함하는 리튬 2차 전지에 있어서, 상기 케이스는 상기 전극조립체의 일부를 수용하도록 일면으로부터 소정깊이 인입형성된 제1파우치를 가지는 전면벽과, 상기 전극조립체를 감싸서 밀봉하기 위해 상기 제1파우치에 대응되도록 소정 깊이 인입형성된 제2파우치를 가지며 상기 전면벽에 결합되는 후면벽을 포함하는 것을 특징으로 한다.In the lithium secondary battery according to the present invention for achieving the above object, a lithium secondary battery comprising an electrode assembly formed by stacking a positive electrode plate, a negative electrode plate and a separator, and a case surrounding and sealing the electrode assembly, the case is A front wall having a first pouch recessed from a surface to receive a portion of the electrode assembly and a second pouch recessed to correspond to the first pouch to enclose and seal the electrode assembly; It characterized in that it comprises a back wall coupled to.

이하 첨부된 도면을 참조하여 본 발명의 실시예에 따른 리튬 2차 전지를 자세히 설명하기로 한다.Hereinafter, a lithium secondary battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2 및 도 3을 참조하면, 본 발명의 실시예에 따른 리튬 2차 전지는, 양극판과 음극판 및 세퍼레이터가 적층된 구조의 전극조립체(20)와, 상기 전극조립체(20)를 감싸서 밀봉하는 케이스(30)를 구비한다. 상기 전극조립체(20)는 상기 케이스(30)의 외부로 노출되는 소정 단자(40)에 전기적으로 연결되며, 이를 위해 전극조립체(20)의 일측에는 상기 단자(40)와 연결되는 연결탭(21)이 마련된다.2 and 3, a lithium secondary battery according to an embodiment of the present invention includes an electrode assembly 20 having a structure in which a positive electrode plate, a negative electrode plate, and a separator are stacked, and a case that surrounds and seals the electrode assembly 20. 30 is provided. The electrode assembly 20 is electrically connected to a predetermined terminal 40 exposed to the outside of the case 30, and for this purpose, a connection tab 21 connected to the terminal 40 is connected to one side of the electrode assembly 20. ) Is provided.

상기 케이스(30)는 일면으로부터 인입형성된 제1파우치(31a)를 가지는 전면벽(31)과, 상기 전면벽(31)에 결합되며 상기 제1파우치(31a)에 대응되는 제2파우치(33a)를 가지는 후면벽(33)을 갖는다. 상기 제1파우치(31a)와 제2파우치(33a) 각각은 전극조립체(20)를 수용하기 위해 형성된 것으로, 소정 깊이를 갖는다. 또한 상기 각 파우치(31a)(33a)는 전극조립체(20)를 수용하기 위한 수용공간외에도, 상기 단자(40)와 연결탭(21)을 체결할 체결공간을 확보할 수 있도록 서로 다른 바닥면적을 갖는 것이 바람직하다. 즉, 본 실시예에서와 같이 제2파우치(33a)가 제1파우치(31a)보다 넓은 면적을 갖도록 형성되는 것이 바람직하며, 반대로 제1파우치(31a)가 제2파우치(33a)보다 넓은 면적을 갖도록 형성될 수도 있다. 또한, 상기 전면벽(31)에 상기 단자(40)가 노출될 수 있도록 관통공(31b)이 형성된다.The case 30 includes a front wall 31 having a first pouch 31a formed from one surface thereof, and a second pouch 33a coupled to the front wall 31 and corresponding to the first pouch 31a. It has a back wall 33 having. Each of the first pouch 31a and the second pouch 33a is formed to accommodate the electrode assembly 20 and has a predetermined depth. In addition to the accommodating space for accommodating the electrode assembly 20, the pouches 31a and 33a may have different floor areas so as to secure a fastening space for fastening the terminal 40 and the connection tab 21. It is desirable to have. That is, as in the present embodiment, it is preferable that the second pouch 33a is formed to have a larger area than the first pouch 31a, and conversely, the first pouch 31a has a larger area than the second pouch 33a. It may be formed to have. In addition, a through hole 31b is formed in the front wall 31 to expose the terminal 40.

상기 구성을 가지는 본 발명의 실시예에 따른 리튬 2차 전지의 경우, 전면벽(31)과 후면벽(33) 각각에 서로 마주하도록 파우치(31a)(33a)가 형성되어 있기 때문에, 케이스(30)는 종래에 비해 적어도 2배의 수용공간을 확보할 수 있다. 따라서, 종래보다 두께가 두꺼운 전극조립체(20)를 감싸도록 수용하여 밀봉시킬 수 있게 된다. 그리고, 이와 같이 두꺼운 두께를 가지는 대용량의 전극조립체(20)를 채용함으로써, 본 발명에 따른 리튬 2차 전지는 휴대용 컴퓨터 또는 전기자동차용 전지로도 사용될 수 있게 되어, 중량당 에너지 밀도를 획기적으로 줄일 수 있다.In the case of the lithium secondary battery according to the embodiment of the present invention having the above configuration, since the pouches 31a and 33a are formed on each of the front wall 31 and the rear wall 33 to face each other, the case 30 ) Can secure at least twice as much space as in the prior art. Therefore, it is possible to accommodate and seal the electrode assembly 20 to be thicker than the conventional. In addition, by employing a large-capacity electrode assembly 20 having a thick thickness as described above, the lithium secondary battery according to the present invention can also be used as a battery for a portable computer or an electric vehicle, thereby dramatically reducing the energy density per weight. Can be.

또한, 각 파우치(31a)(33a)의 면적을 다르게 형성함으로써, 내부에 단자(40)와 전극조립체(20)를 전기적으로 연결되도록 체결할 수 있는 체결공간을 쉽게 마련할 수 있다.In addition, by forming different areas of the pouches 31a and 33a, a fastening space for fastening the terminal 40 and the electrode assembly 20 to be electrically connected therein may be easily provided.

상술한 바와 같은 본 발명의 리튬 2차 전지에 따르면, 전면벽과 후면벽 각각에 파우치를 형성하여 대용량의 전극조립체를 감싸도록 수용하여 밀봉시키는 것이 가능하게 된다. 따라서, 파우치를 형성시킨 케이스를 이용하여 휴대용 컴퓨터나 전기자동차용 전지와 같이 대용량의 전지를 제작할 수 있게 되어 제작비용을 줄일 수 있다.According to the lithium secondary battery of the present invention as described above, it is possible to form a pouch on each of the front wall and the rear wall to accommodate and seal the large-capacity electrode assembly. Therefore, a large capacity battery such as a portable computer or an electric vehicle battery can be manufactured using the case having the pouch formed therein, thereby reducing the manufacturing cost.

Claims (2)

양극판과, 음극판과, 그 사이에 개재되는 세퍼레이터가 적층되어 이루어진 전극조립체; 및An electrode assembly including a cathode plate, an anode plate, and a separator interposed therebetween; And 상기 전극조립체의 일부를 수용하도록 일면으로부터 일정 깊이로 인입형성된 제1 파우치를 가지는 전면벽과, 상기 전극조립체를 감싸서 밀봉하도록 상기 전면벽에 결합되며, 상기 제1 파우치와 대응되게 일면으로부터 일정 깊이로 인입형성된 제2 파우치를 가지는 후면벽을 가지는 케이스;를 포함하는 리튬 2차 전지.A front wall having a first pouch formed to be pulled from one surface to a predetermined depth to receive a portion of the electrode assembly, and coupled to the front wall to surround and seal the electrode assembly, and to a predetermined depth from one surface to correspond to the first pouch And a case having a back wall having a second pouch formed therein. 제1항에 있어서,The method of claim 1, 상기 제1 파우치와, 제2 파우치는 상기 케이스로부터 외부로 노출되는 단자를 전극조립체로부터 인출되는 연결탭과 체결하기 위한 체결공간을 마련하기 위하여 서로 다른 바닥면적으로 형성된 것을 특징으로 하는 리튬 2차 전지.Wherein the first pouch and the second pouch are formed with different bottom areas to provide a fastening space for fastening the terminals exposed to the outside from the case with the connection tabs drawn out from the electrode assembly. .
KR1019990032579A 1999-08-09 1999-08-09 Lithium secondary battery KR100615153B1 (en)

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KR100858799B1 (en) 2002-06-29 2008-09-17 삼성에스디아이 주식회사 Pouch type secondary battery
KR100863898B1 (en) * 2002-08-19 2008-10-16 삼성에스디아이 주식회사 Battery
KR20050020357A (en) * 2003-08-22 2005-03-04 삼성에스디아이 주식회사 Pouch case and pouched type secondary battery comprising the same
KR100893225B1 (en) * 2006-07-24 2009-04-16 주식회사 엘지화학 Secondary Battery Having Improved Capacitance and Safety
KR101875962B1 (en) * 2012-07-30 2018-07-06 현대자동차주식회사 Pouch type secondary battery cell with high-stiffness and Structure for assembling thereof

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JPH1167168A (en) * 1997-08-13 1999-03-09 Ricoh Co Ltd Thin polymer battery
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