KR20090076281A - Pouched type battery - Google Patents

Pouched type battery Download PDF

Info

Publication number
KR20090076281A
KR20090076281A KR1020080002140A KR20080002140A KR20090076281A KR 20090076281 A KR20090076281 A KR 20090076281A KR 1020080002140 A KR1020080002140 A KR 1020080002140A KR 20080002140 A KR20080002140 A KR 20080002140A KR 20090076281 A KR20090076281 A KR 20090076281A
Authority
KR
South Korea
Prior art keywords
pouch
electrode
type battery
case
battery
Prior art date
Application number
KR1020080002140A
Other languages
Korean (ko)
Inventor
류지헌
이은주
이한호
신영준
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to KR1020080002140A priority Critical patent/KR20090076281A/en
Publication of KR20090076281A publication Critical patent/KR20090076281A/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/141—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against humidity
    • 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
    • H01M50/178—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

A pouch type battery is provided to prevent the degradation of battery performance by minimizing moisture permeation path and to improve durability of the battery by folding the lower hem of the pouch. A pouch type battery comprises an electrode assembly(10) and a pouch case(20) surrounding and sealing the electrode assembly. The pouch case is made of one pouch sheet and has a protrusion part(21) formed by folding the lower hem of the pouch which is the opposite side of the electrode lead(11) in an opposite direction of the electrode. In the protrusion part, the middle or the edge of the lower hem of the pouch case is formed in order to be protruded in opposite direction of the electrode.

Description

파우치형 전지{Pouched type battery}Pouch type battery

본 발명은 내구성이 향상된 파우치형 전지에 대한 것이다.The present invention relates to a pouch type battery with improved durability.

이차 전지는 다양한 휴대용 전자기기의 전력원으로써 사용되고 있다. 이차 전지는 캔형, 각형, 파우치형 등으로 제작이 가능한데, 이 중 파우치형 전지는 기존의 캔형이나 각형 전지에 비하여 다양한 형태로의 제작이 가능하고, 가벼워서 휴대용 전자기기에 더욱 적합하여 각광을 받고 있다.Secondary batteries are used as power sources for various portable electronic devices. Secondary batteries can be manufactured in cans, squares, pouches, etc. Among them, pouch-type batteries can be manufactured in various forms compared to conventional cans or squares, and are lighter, making them more suitable for portable electronic devices. .

파우치형 전지는, 음극, 양극 및 세퍼레이터를 포함하는 전극조립체와, 이 외부를 감싸는 파우치 케이스로 이루어진다. The pouch type battery includes an electrode assembly including a negative electrode, a positive electrode, and a separator, and a pouch case surrounding the outside.

일반적으로 파우치형 전지는 2장의 파우치형 케이스를 전극조립체의 위 아래로 배치하여 양옆 및 전극리드 반대편의 밑단도 열융착하여 밀봉한다.In general, a pouch-type battery is arranged by placing two pouch-type cases above and below the electrode assembly to heat seal and seal the lateral sides and the bottom of the electrode lead.

융착 부위가 증가하면, 수분이 침투할 수 있는 경로가 증가하는 문제가 있을 뿐 아니라, 전극 리드 부분에서는 특히 기밀성이 떨어지는 문제가 있다.When the fusion site is increased, there is a problem that the path through which moisture can penetrate is increased, and there is a problem of particularly poor airtightness at the electrode lead portion.

이러한 문제점을 해결하기 위하여 전극 리드를 한쪽 방향으로만 형성하여 수분침투 가능성을 낮추고, 한 장의 파우치형 케이스를 반으로 접어 위아래로 배치하여 양 옆단은 열융착을 하지만 전극 리드 반대편인 밑단은 열융착할 필요가 없도록 하는 방법 등이 개발되고 있다. 그런데 이렇게 1장의 파우치형 케이스를 이용하는 경우에는 밑단 부위가 열융착이 없어 기밀성은 좋아지나, 밑단부위가 2장의 파우치형 케이스를 이용하여 열융착한 경우보다 얇게 형성되고, 평평한 형태를 가지게 된다. 따라서, 마모나 외부의 충격에 대한 전지의 내구성이 약하고, 또한 평평한 형태로 인하여 전지가 사용되는 제품 등에 대한 고정이 어려운 문제가 있었다.To solve this problem, the electrode leads are formed in only one direction to reduce the possibility of moisture penetration, and one pouch type case is folded in half and placed up and down to heat-bond both sides, but the bottom of the electrode lead is heat-sealed. There is a way to eliminate the need. However, in the case of using one pouch type case, there is no heat fusion at the hem portion, so that the airtightness is improved, but the hem portion is formed thinner than the case of heat fusion using two pouch type cases, and has a flat shape. Therefore, the durability of the battery against abrasion or external impact is weak, and due to the flat shape, there is a problem that it is difficult to fix the product to which the battery is used.

따라서, 전지의 기밀성을 유지하면서도, 제품의 내구성이 우수한 파우치형 전지의 개발이 절실히 필요하다.Therefore, while maintaining the airtightness of the battery, the development of a pouch-type battery excellent in the durability of the product is urgently needed.

본 발명이 해결하고자 하는 과제는 내구성 향상 및 수분침투에 의한 전지의 성능저하를 동시에 방지할 수 있는 파우치형 전지를 제공하는 것이다.SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a pouch-type battery capable of simultaneously improving durability and preventing performance degradation of the battery due to moisture penetration.

본 발명에 의한 파우치형 전지는,전극조립체와, 상기 전극조립체의 외부를 감싸서 밀봉하는 파우치케이스로 이루어지고, 상기 파우치케이스는 1장의 파우치로 이루어지되, 전극리드의 반대편인 밑단이 전극반대방향으로 돌출되도록 접어서 형성된 돌출부를 형성하는 것을 특징으로 한다.The pouch-type battery according to the present invention comprises an electrode assembly and a pouch case that wraps and seals the outside of the electrode assembly, and the pouch case is made of one pouch, but the opposite end of the electrode lead is opposite to the electrode direction. It is characterized by forming a protrusion formed by folding so as to protrude.

또한, 상기 돌출부는 상기 파우치형케이스의 전극의 반대편인 밑단의 중간부를 전극과 반대방향으로 돌출되도록 볼록하게 형성한 것일 수 있다.In addition, the protrusion may be formed to be convex so as to protrude in the opposite direction to the electrode in the middle portion of the bottom opposite the electrode of the pouch-shaped case.

또한, 상기 돌출부는 상기 파우치형 케이스의 밑단의 가장자리부를 전극과 반대 방향으로 돌출되도록 볼록하게 형성한 것일 수 있다.In addition, the protrusion may be formed to be convex so as to protrude in the opposite direction to the electrode edge portion of the pouch-shaped case.

또한, 상기 돌출부의 길이는 3~20mm일 수 있다.In addition, the length of the protrusion may be 3 ~ 20mm.

또한, 상기 돌출부는 열융착 하는 것일 수 있다.In addition, the protrusion may be heat fusion.

또한, 상기 열융착은 파우치 케이스의 측면부의 실링 온도보다 5~50℃낮은 온도로 열융착하는 것일 수 있다.In addition, the heat fusion may be heat fusion at a temperature 5 ~ 50 ℃ lower than the sealing temperature of the side portion of the pouch case.

본 발명에 의하면, 수분 침투 경로를 최소화하여 전지 성능 저하를 방지하면서도, 밑단을 접어서 처리하여 전지의 고정이 용이하고, 전지의 내구성 또한 향상시킬 수 있는 효과가 있다.According to the present invention, while minimizing the water penetration path to prevent battery performance deterioration, it is easy to fix the battery by folding the hem and the battery durability can be improved.

본 발명에 의한 파우치형 전지는 도 1에서 도시한 바와 같이 전극조립체(10)와, 상기 전극조립체의 외부를 감싸서 밀봉하는 파우치케이스(20)로 이루어지고, 상기 파우치케이스는 1장의 파우치로 이루어지되, 전극리드(11)의 반대편인 밑단이 전극반대방향으로 돌출되도록 접어서 형성된 돌출부(21)를 형성한다.Pouch-type battery according to the present invention is made of an electrode assembly 10, as shown in Figure 1, and a pouch case 20 for wrapping and sealing the outside of the electrode assembly, the pouch case is made of one pouch The bottom end opposite to the electrode lead 11 is formed to fold so as to protrude in the opposite electrode direction.

상기 전극조립체(10)는 양극활물질이 도포된 양극과, 음극활물질이 도포된 음극 및 상기 양극과 음극 사이에 위치하여 쇼트를 방지하고 이온의 이동만이 가능하게 하는 분리막으로 이루어진다.The electrode assembly 10 includes a cathode coated with a cathode active material, a cathode coated with an anode active material, and a separator positioned between the anode and the cathode to prevent shorting and to allow only ions to move.

양극은 폴리에틸렌, 폴리프로필렌, 염소화 폴리에틸렌, 폴리부틸렌, 염소화 폴리프로필렌, 폴리에틸렌 유도체, 폴리불화비닐리덴, 폴리비닐알코올, 카르복시메틸셀룰로우즈(CMC), 전분, 히드록시프로필셀룰로우즈, 재생 셀룰로우즈, 폴리비닐피롤리돈, 테트라플루오로에틸렌, 폴리에틸렌, 폴리프로필렌, 에틸렌-프로필렌-디엔 테르 폴리머(EPDM), 술폰화 EPDM, 스티렌 브티렌 고무, 및 불소 고무 이루어진 군으로부터 1 종 이상 선택되는 바인더와, 결합제, 도전제 등을 양극활물질과 함께 용매에 분산시켜 슬러리를 제조한 후 양극집전체에 도포하고 건조 및 압착하여 제조한다. The positive electrode is polyethylene, polypropylene, chlorinated polyethylene, polybutylene, chlorinated polypropylene, polyethylene derivatives, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose At least one selected from the group consisting of rose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, and fluorine rubber A binder, a binder, a conductive agent, and the like are dispersed in a solvent together with a positive electrode active material to prepare a slurry, and then coated on a positive electrode current collector, dried, and pressed.

음극의 경우도, 양극의 제조와 마찬가지로 바인더와, 도전제, 결합제 등을 음극활물질과 함께 용매에 분산시켜 제조된 슬러리를 음극집전체에 도포, 건조 및 압착하여 제조한다.Also in the case of the negative electrode, a slurry prepared by dispersing a binder, a conductive agent, a binder, and the like in a solvent together with a negative electrode active material is applied to the negative electrode current collector, dried, and pressed in the same manner as in the preparation of the positive electrode.

또한 상기 슬러리에는 선택적으로 점도 조절제, 충진제, 가교 촉진제, 커플링제, 접착 촉진제 등의 기타 성분들이 더 포함될 수 있다. In addition, the slurry may optionally further include other components such as viscosity regulators, fillers, crosslinking accelerators, coupling agents, adhesion promoters, and the like.

이때 상기 양극활물질로는 LiCoC2, LiMn2O4, LiNiO2, LiNi1 -xCoxO2(0<x<1), LiMnO2 등의 복합금속산화물이 사용될 수 있고, 양극집전체로는 알루미늄, 니켈, 또는 이들의 조합에 의해서 제조되는 호일(foil)을 이용할 수 있다.In this case, as the cathode active material, a composite metal oxide such as LiCoC 2 , LiMn 2 O 4 , LiNiO 2 , LiNi 1- x Co x O 2 (0 <x <1), LiMnO 2, and the like may be used. A foil made of aluminum, nickel, or a combination thereof can be used.

상기 음극활물질로는 Si, Sn, 틴 옥사이드, 틴 합금 복합체(composite tin alloys), 전이금속화합물, 리튬금속나이트라이드, 리튬금속 산화물, 탄소계열물질 등이 사용될 수 있으나, 본 발명에서 사용되는 음극활물질이 이에 한정되는 것은 아니다. 또한, 음극에 사용되는 음극집전체로는 구리, 금, 니켈 혹은 구리 합금 혹은 이들의 조합에 의해서 제조되는 호일을 이용할 수 있다.The negative electrode active material may be Si, Sn, tin oxide, tin alloy composites (composite tin alloys), transition metal compounds, lithium metal nitride, lithium metal oxide, carbon-based materials, etc., the negative electrode active material used in the present invention This is not limited to this. As the negative electrode current collector used for the negative electrode, a foil made of copper, gold, nickel or a copper alloy or a combination thereof can be used.

상기 도전제로는 전지의 화학적 변화를 유발하지 않으면서 도전성을 가진 것이라면 특별히 제한되는 것은 아니며, 예를 들어, 천연 흑연이나 인조 흑연 등의 흑연, 카본블랙, 아세틸렌 블랙, 케첸 블랙, 채널 블랙, 퍼네이스 블랙, 램프 블랙, 서머 블랙 등의 카본블랙; 탄소 섬유나 금속 섬유 등의 도전성 섬유와, 불화 카본, 알루미늄, 니켈 분말 등의 금속 분말, 산화아연, 티탄산 칼륨 등의 도전성 위스키, 산화 티탄 등의 도전성 금속 산화물과 폴리페닐렌 유도체 등의 도전성 소 재 등이 사용될 수 있다. The conductive agent is not particularly limited as long as it has conductivity without causing chemical change of the battery. For example, graphite such as natural graphite or artificial graphite, carbon black, acetylene black, ketjen black, channel black, furnace Carbon black such as black, lamp black, and summer black; Conductive materials such as conductive fibers such as carbon fibers and metal fibers, metal powders such as carbon fluoride, aluminum and nickel powders, conductive whiskeys such as zinc oxide and potassium titanate, conductive metal oxides such as titanium oxide and polyphenylene derivatives And the like can be used.

또한, 본 발명에서 사용될 수 있는 분리막은 미세 다공 구조를 가지는 폴리에틸렌 (polyethylene), 폴리프로필렌 (polypropylene), 또는 이들 필름의 조합에 의해서 제조되는 다층 필름 등이나, 또는 폴리비닐리덴 플루오라이드 (polyvinylidene fluoride), 폴리에틸렌옥사이드 (polyethylene oxide), 폴리아크릴로나이트릴 (polyacrylonitrile) 또는 폴리비닐리덴 플루오라이드 헥사플루오로프로필렌 (polyvinylidene fluoride hexafluoropropylene) 공중합체와 같은 고체 고분자 전해질용 또는 겔형 고분자 전해질용 고분자 필름 등이 있다.In addition, the separator that can be used in the present invention is a multi-layered film made by polyethylene (polyethylene), polypropylene (polypropylene), or a combination of these films having a microporous structure, or polyvinylidene fluoride (polyvinylidene fluoride) And polymer films for solid polymer electrolytes or gel polymer electrolytes such as polyethylene oxide, polyacrylonitrile or polyvinylidene fluoride hexafluoropropylene copolymers.

상기 전극조립체(10)가 준비되면, 상기 전극조립체를 수용하기 위한 파우치 케이스(20)를 준비한다. When the electrode assembly 10 is prepared, a pouch case 20 for accommodating the electrode assembly is prepared.

상기 파우치 케이스는 금속층과, 상기 금속층의 일면에는 열융착층이, 다른 일면에는 절연막이 형성되어 있는 라미네이트 시트 형태이며, 상기 전극조립체(10)를 수용하기 위한 소정의 내부공간이 마련된다. The pouch case is in the form of a laminate sheet in which a metal layer, a heat seal layer is formed on one surface of the metal layer, and an insulating film is formed on the other surface thereof, and a predetermined internal space for accommodating the electrode assembly 10 is provided.

상기 열융착층은 C-PP(Casted Polypropylene)등의 변성 폴리프로필렌을 사용할 수 있으며, 상기 절연막은 나일론이나 폴리에틸렌테레프탈레이트(PET)와 같은 수지재로 형성될 수 있으나, 이에 한정되는 것은 아니다.The heat seal layer may be modified polypropylene such as C-PP (Casted Polypropylene), and the insulating layer may be formed of a resin material such as nylon or polyethylene terephthalate (PET), but is not limited thereto.

상기 전극조립체에는 전극이 연결되어 외부로 노출되는데, 외부로 노출되는 전극과, 전극조립체의 수용을 위해서는 파우치 케이스의 일부가 개방되어있어야 하고, 조립을 마친 후에는 실링을 할 수 있어야한다.An electrode is connected to the electrode assembly and exposed to the outside, and the electrode exposed to the outside and a part of the pouch case must be open for accommodating the electrode assembly, and should be sealed after assembly.

따라서, 상기 전극조립체를 감싸기 위해 마주보는 상기 파우치 케이스의 면 은 열융착층이고, 열융착에 의해 실링이 완료된다.Therefore, the surface of the pouch case facing each other to surround the electrode assembly is a heat seal layer, and sealing is completed by heat welding.

본 발명에 의한 파우치형 전지는 상기 전극조립체를 수용하기 위한 소정이 내부공간뿐 아니라, 돌출부(21)를 마련하는데, 돌출부는 도 2에서 도시된 바와 같이 상기 파우치 케이스의 전극의 반대편인 밑단의 중간부를 전극과 반대방향으로 돌출되도록 접어서 볼록하게 형성할 수 있다. The pouch-type battery according to the present invention provides a protrusion 21 as well as a predetermined internal space for accommodating the electrode assembly. The protrusion is a middle portion of the bottom opposite to the electrode of the pouch case as shown in FIG. 2. The part may be folded to protrude in the opposite direction to the electrode and formed convex.

즉, 1장의 파우치 케이스를 도 1에서 도시된 바와 같이 접어서 파우치의 개방된 부분으로 전극부분이 위치하고, 접어진 부분이 전극의 반대편인 밑단방향으로도 가도록 배치하여 이 안에 전극조립체를 넣은 후 실링하면 밑단의 기계적 강도가 향상될 뿐 아니라, 돌출부에 의해 전지의 고정이 보다 용이해진다.That is, when one pouch case is folded as shown in FIG. 1, the electrode part is positioned as an open part of the pouch, and the folded part is arranged to go in the hem direction opposite to the electrode. Not only the mechanical strength of the hem is improved, but the protrusion makes the battery easier to fix.

본 발명에 의한 파우치 전지의 또다른 실시예로는 도 3 및 도 4에서 도시한 바와 같이 상기 파우치 케이스의 밑단의 가장자리부를 전극과 반대 방향으로 돌출되도록 볼록하게 형성한 것일 수도 있다.As another embodiment of the pouch battery according to the present invention, as shown in FIGS. 3 and 4, the edge portion of the bottom of the pouch case may be convex to protrude in an opposite direction to the electrode.

본 발명에서 돌출부의 위치는 도 2 또는 도 3에서 도시된 실시예에 한정되지 않고, 본 발명에 의한 파우치형 전지가 사용되는 용도에 따라 달리 위치시킬 수 있다.The position of the protrusion in the present invention is not limited to the embodiment shown in FIG. 2 or 3, it can be positioned differently depending on the use of the pouch-type battery according to the present invention.

상기 돌출부의 전극 리드 반대 방향으로 나온 방향의 길이는 3~20mm일 수 있는데, 3mm 미만일 경우에는 고정능력향상 및 내구성 향상의 효과를 얻기 힘들고, 20mm를 초과하더라도 20mm이하보다 효과가 크지 않다.The length of the protruding portion in the opposite direction to the electrode lead may be 3 ~ 20mm, less than 3mm, it is difficult to obtain the effect of improving the fixing capacity and durability, even if more than 20mm less than 20mm.

본 발명에 의한 파우치 케이스는 1장의 파우치로 형성하기 때문에 상기 돌출부의 실링은 불필요하므로 따로 융착하지 않아도 무방하나, 돌출부의 기계적 강 도를 향상하기 위하여 열융착할 수도 있다. 열융착 하는 경우에는 상기 파우치 케이스의 측면부의 실링시의 온도보다 5~50℃낮은 온도로 열융착할 수 있다. Since the pouch case according to the present invention is formed of a single pouch, the sealing of the protrusion is unnecessary, so it may not need to be separately welded, but may be heat-sealed to improve the mechanical strength of the protrusion. In the case of thermal fusion, the thermal fusion may be performed at a temperature of 5 to 50 ° C. lower than the temperature at the time of sealing the side surface of the pouch case.

열융착을 하더라도 측면의 실링 온도보다 낮은 온도에서 열융착이 수행되므로, 전지에 가해지는 열에 의한 전지의 성능저하는 없으며, 기계적 강도가 더 우수해진다. Even if thermal fusion is performed, heat fusion is performed at a temperature lower than the sealing temperature of the side surface, so that there is no performance degradation of the battery due to heat applied to the battery, and mechanical strength is further improved.

도 1 내지 도 4는 본 발명에 의한 파우치형 전지의 일 실시예를 모식적으로 도시한 것이다.1 to 4 schematically show one embodiment of the pouch-type battery according to the present invention.

Claims (6)

전극조립체와, 상기 전극조립체의 외부를 감싸서 밀봉하는 파우치케이스로 이루어지고,An electrode assembly and a pouch case surrounding and sealing the outside of the electrode assembly, 상기 파우치케이스는 1장의 파우치로 이루어지되, 전극리드의 반대편인 밑단이 전극반대방향으로 돌출되도록 접어서 형성된 돌출부를 형성하는 것을 특징으로 하는 파우치형 전지.The pouch case is made of one pouch, pouch-type battery, characterized in that to form a protrusion formed by folding the bottom end opposite to the electrode lead protrudes in the opposite electrode direction. 청구항 1에 있어서,The method according to claim 1, 상기 돌출부는 상기 파우치케이스의 전극의 반대편인 밑단의 중간부를 전극과 반대방향으로 돌출되도록 볼록하게 형성한 것을 특징으로 하는 파우치형 전지.The protruding portion is a pouch-type battery, characterized in that the convexly formed so as to protrude in the direction opposite to the middle of the lower end of the electrode opposite the electrode of the pouch case. 청구항 1에 있어서,The method according to claim 1, 상기 돌출부는 상기 파우치 케이스의 밑단의 가장자리부를 전극과 반대 방향으로 돌출되도록 볼록하게 형성한 것을 특징으로 하는 파우치형 전지.The protruding portion is a pouch-type battery, characterized in that the convexly formed so as to project the edge portion of the bottom of the pouch case in the opposite direction to the electrode. 청구항 1에 있어서,The method according to claim 1, 상기 돌출부의 길이는 3~20mm인 것을 특징으로 하는 파우치형 전지.Pouch-type battery, characterized in that the length of the protrusion is 3 ~ 20mm. 청구항 1에 있어서,The method according to claim 1, 상기 돌출부는 열융착 하는 것을 특징으로 하는 파우치형 전지.Pouch-type battery, characterized in that the protrusion is heat-sealed. 청구항 5에 있어서,The method according to claim 5, 상기 열융착은 파우치 케이스의 측면부의 실링 온도보다 5~50℃낮은 온도로 열융착하는 것을 특징으로 하는 파우치형 전지.The thermal fusion is a pouch-type battery, characterized in that the thermal fusion at a temperature 5 ~ 50 ℃ lower than the sealing temperature of the side portion of the pouch case.
KR1020080002140A 2008-01-08 2008-01-08 Pouched type battery KR20090076281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080002140A KR20090076281A (en) 2008-01-08 2008-01-08 Pouched type battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080002140A KR20090076281A (en) 2008-01-08 2008-01-08 Pouched type battery

Publications (1)

Publication Number Publication Date
KR20090076281A true KR20090076281A (en) 2009-07-13

Family

ID=41333413

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080002140A KR20090076281A (en) 2008-01-08 2008-01-08 Pouched type battery

Country Status (1)

Country Link
KR (1) KR20090076281A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010134788A3 (en) * 2009-05-21 2011-03-24 주식회사 엘지화학 Water-resistant pouch-type secondary battery
WO2011159106A2 (en) * 2010-06-16 2011-12-22 주식회사 이아이지 Pouch type battery and manufacturing method thereof
WO2012177083A2 (en) * 2011-06-22 2012-12-27 주식회사 엘지화학 Pouch and pouch type secondary battery
KR101253671B1 (en) * 2010-11-12 2013-04-11 주식회사 이아이지 Lithium secondary battery and manufacturing method of the same
WO2020066520A1 (en) * 2018-09-25 2020-04-02 積水化学工業株式会社 Power storage element and power storage element production method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010134788A3 (en) * 2009-05-21 2011-03-24 주식회사 엘지화학 Water-resistant pouch-type secondary battery
US8148004B2 (en) 2009-05-21 2012-04-03 Lg Chem, Ltd. Water-resistant pouch type secondary cell
US8530075B2 (en) 2009-05-21 2013-09-10 Lg Chem, Ltd. Water-resistant pouch type secondary cell
WO2011159106A2 (en) * 2010-06-16 2011-12-22 주식회사 이아이지 Pouch type battery and manufacturing method thereof
WO2011159106A3 (en) * 2010-06-16 2012-05-03 주식회사 이아이지 Pouch type battery and manufacturing method thereof
KR101253671B1 (en) * 2010-11-12 2013-04-11 주식회사 이아이지 Lithium secondary battery and manufacturing method of the same
WO2012177083A2 (en) * 2011-06-22 2012-12-27 주식회사 엘지화학 Pouch and pouch type secondary battery
WO2012177083A3 (en) * 2011-06-22 2013-02-28 주식회사 엘지화학 Pouch and pouch type secondary battery
CN103125031A (en) * 2011-06-22 2013-05-29 株式会社Lg化学 Pouch and pouch type secondary battery
WO2020066520A1 (en) * 2018-09-25 2020-04-02 積水化学工業株式会社 Power storage element and power storage element production method
JP2022002167A (en) * 2018-09-25 2022-01-06 積水化学工業株式会社 Power storage element and method for manufacturing power storage element

Similar Documents

Publication Publication Date Title
KR101684026B1 (en) Nonaqueous electrolyte battery, battery pack and storage battery apparatus
JP4458145B2 (en) Battery pack and manufacturing method thereof
EP1760820A1 (en) Rectangular lithium secondary battery
US20050100784A1 (en) Laminated battery
EP3200262B1 (en) Rectangular secondary battery
JP2007066806A (en) Bipolar battery
JP3891047B2 (en) battery
KR101495953B1 (en) Pouch for secondary battery and secondary battery using the same
KR102137697B1 (en) Battery Cell Comprising Protection Circuit Module Assembly Having Lead Plate
KR20090076281A (en) Pouched type battery
US11069935B2 (en) Cell and battery
US20230010746A1 (en) Electrode Assembly and Method for Manufacturing the Same
CN110447120B (en) Lithium ion battery
KR20090076364A (en) Pouched-type battery
JP3869668B2 (en) Electrochemical device and manufacturing method thereof
US11870039B2 (en) Electrode assembly and method for manufacturing the same
JP2000294286A (en) Polymer lithium secondary battery
JP2004319098A (en) Electrochemical cell and its manufacturing method
JPH11204088A (en) Sheet battery
JP2002222666A (en) Lithium secondary cell
JP3980757B2 (en) Thin battery
JP2000058014A (en) Thin battery
JPH11162421A (en) Sheet type battery
JPH1167167A (en) Sheet battery
KR101163388B1 (en) Secondary Battery with Excellent Insulation Resistance

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
J201 Request for trial against refusal decision
B601 Maintenance of original decision after re-examination before a trial
J301 Trial decision

Free format text: TRIAL DECISION FOR APPEAL AGAINST DECISION TO DECLINE REFUSAL REQUESTED 20140801

Effective date: 20150423