WO2015065124A1 - Pouch-type secondary battery capable of preventing water permeation - Google Patents

Pouch-type secondary battery capable of preventing water permeation Download PDF

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Publication number
WO2015065124A1
WO2015065124A1 PCT/KR2014/010395 KR2014010395W WO2015065124A1 WO 2015065124 A1 WO2015065124 A1 WO 2015065124A1 KR 2014010395 W KR2014010395 W KR 2014010395W WO 2015065124 A1 WO2015065124 A1 WO 2015065124A1
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WO
WIPO (PCT)
Prior art keywords
pouch
secondary battery
preventing member
series
type secondary
Prior art date
Application number
PCT/KR2014/010395
Other languages
French (fr)
Korean (ko)
Inventor
윤두성
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 CN201480007104.3A priority Critical patent/CN104969377A/en
Priority to US14/432,037 priority patent/US20160028051A1/en
Priority claimed from KR1020140150287A external-priority patent/KR20150051178A/en
Publication of WO2015065124A1 publication Critical patent/WO2015065124A1/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
    • 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
    • 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
    • H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
    • H01M50/141—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against humidity
    • 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

Definitions

  • the present invention relates to a secondary battery, and more particularly to a pouch type secondary battery that can prevent the penetration of moisture.
  • a secondary battery unlike a primary battery that cannot be charged, means a battery that can be charged and discharged, and is widely used in electronic devices such as mobile phones, notebook computers, camcorders, and electric vehicles.
  • the lithium secondary battery has an operating voltage of about 3.6V, and has about three times the capacity of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and has a high energy density per unit weight. The degree is increasing rapidly.
  • Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively.
  • the lithium secondary battery includes an electrode assembly having a positive electrode plate and a negative electrode plate coated with the positive electrode active material and the negative electrode active material, respectively, with a separator interposed therebetween, and an exterior member for sealingly accommodating the electrode assembly together with the electrolyte, that is, a battery case.
  • a lithium secondary battery may be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can and a pouch type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet.
  • FIG. 1 is a view schematically showing the configuration of a pouch type secondary battery according to the prior art.
  • a pouch type secondary battery includes a case, an electrode assembly, an electrode tab, an electrode lead, and a sealing part.
  • the case 11 includes an upper pouch case and a lower pouch case, and may be formed to have a size that can accommodate the electrode assembly 12, the electrode tab 13, and the electrode lead 14, which will be described later. It includes a sealing portion 16 formed by heat-sealing the upper and lower cases.
  • the electrode assembly 12 includes a positive electrode plate, a negative electrode plate, and a separator.
  • the positive electrode plate and the negative electrode plate may be sequentially stacked in a state where a separator is interposed therebetween.
  • the electrode assembly 12 typically includes a jelly-roll (wound) electrode assembly having a structure in which long sheets of positive and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive and negative electrodes cut in units of a predetermined size. Stacked electrode assembly sequentially stacked with separators interposed therebetween, stacks of bicell or full cells wound with stacked positive and negative electrodes in a predetermined unit via separators And a folding type electrode assembly.
  • the electrode tab 13 extends from the electrode assembly 12.
  • the positive electrode tab extends from the positive plate and the negative electrode tab extends from the negative plate.
  • the electrode tabs 13 extend from the respective positive electrode plates and the negative electrode plates.
  • the electrode tab 13 may not be directly exposed to the outside of the case 11, but may be connected to another component such as the electrode lead 14.
  • the electrode lead 14 is electrically connected to portions of the electrode tabs 13 extending from the positive electrode plate or the negative electrode plate, respectively. That is, the positive lead is coupled to the positive electrode tab and electrically connected to each other, and the negative lead is coupled to the negative electrode tab and electrically connected to each other.
  • an insulating film 15 may be attached to a portion of the upper and lower surfaces of the electrode lead 14 in order to increase the degree of sealing with the battery case 11 and to secure an electrically insulating state.
  • the pouch-type secondary battery according to the prior art as described above becomes a complete secondary battery after the electrode assembly is put into the pouch-type case, the electrolyte is injected, and after the post-treatment process such as sealing process, aging process, chemical conversion process, etc. .
  • the sealing part 15 may be formed around the outer periphery of the case by bonding or bonding the upper case and the lower case by heat fusion or the like in the sealing process of the pouch-type case. By means of the band of the heat-sealing layer formed in the portion where the upper, lower case abuts.
  • FIG. 2 is a cross-sectional view illustrating a process of forming a sealing part of the pouch type case of FIG. 1.
  • the laminate sheet 20 is composed of an outer resin layer 20a forming an outermost shell, a barrier metal layer 20b that prevents penetration of a material, and an inner resin layer 20c for sealing. .
  • the outer resin layer 20a serves to protect the battery from the outside, excellent tensile strength and weather resistance to thickness are required, and ONy (stretched nylon) is generally used.
  • the blocking metal layer 20b serves to prevent air, moisture, and the like from flowing into the battery, and aluminum is generally used.
  • the inner resin layer 20c is thermally fused by heat and pressure applied in a state in which the electrode assembly is embedded, thereby providing a sealing property, and generally CPP (casting polypropylene) is used.
  • the multilayer sheet 20 of this multi-layer structure forms a structure in which the inner resin layers 20c face each other in the sealing portion, and the inner resin layers 20c are bonded to each other by thermal fusion. Therefore, the inner resin layer 20c is exposed to the outside at the end where the laminate sheet 20 is bonded, and the inner resin layer 20c mainly made of a polymer resin easily penetrates moisture and there is a possibility of leakage of electrolyte solution. In case of prolonged use, it acts as a factor to impair battery life and stability.
  • an object of the present invention is to provide a lithium secondary battery that can prevent the ingress of moisture from the outside by attaching a moisture intrusion prevention member to the sealing portion formed in the pouch case.
  • a pouch type secondary battery includes: an electrode assembly in which a positive electrode plate and a negative electrode plate are disposed with a separator interposed therebetween; And a pouch-shaped case having a sealing portion formed along an edge after accommodating and packaging the electrode assembly and the electrolyte therein, wherein the moisture penetration preventing member is attached to the entire sealing portion formed at the edge of the pouch-shaped case by welding.
  • an electrode assembly in which a positive electrode plate and a negative electrode plate are disposed with a separator interposed therebetween
  • a pouch-shaped case having a sealing portion formed along an edge after accommodating and packaging the electrode assembly and the electrolyte therein, wherein the moisture penetration preventing member is attached to the entire sealing portion formed at the edge of the pouch-shaped case by welding.
  • the moisture penetration preventing member may have a width direction attached to an end portion of the sealing portion thicker than a height direction attached to the upper and lower portions of the sealing portion, and may be attached by welding.
  • the sealing part may be pressed by a mold jig having a plurality of protrusions to form a hole, and the moisture penetration preventing member may fill the hole by welding, and may be attached to the entire sealing part.
  • the hole may be formed in a rectangular shape in the longitudinal direction in which the electrode lead is formed.
  • the moisture penetration preventing member may be polyethylene terephthalate (PET).
  • the moisture penetration preventing member may be a silicone series, an epoxy series, a cyanoacrylic acid series, a polyvinyl acrylate series, an ethylene vinyl acetate series, an acrylate series, a polychloroprene series, a mixture series of a polyurethane resin and a polyester resin, a polyol and a poly It may be any one selected from the group consisting of a mixture of a urethane resin, a mixture of an acrylic polymer and a polyurethane resin, a polyimide series, and a mixture of a cyanoacrylate and a urethane, or a mixture of two or more thereof.
  • the moisture penetration preventing member may be any one or a mixture of an epoxy resin and a silicone resin.
  • the moisture penetration preventing member may form a width direction attached to the end of the sealing portion thicker than the height direction attached to the upper and lower portions of the sealing portion, thereby preventing water penetration more effectively.
  • the sealing portion can be more firmly bonded.
  • FIG. 1 is an exploded perspective view of a pouch type secondary battery according to the prior art
  • FIG. 2 is a cross-sectional view illustrating a process of forming a sealing part of the pouch-shaped case of FIG. 1;
  • FIG. 3 is a view illustrating a configuration of a pouch type secondary battery with a moisture penetration preventing member according to an embodiment of the present invention
  • FIG. 4 is a partial cross-sectional view of a sealing part with a water penetration preventing member according to an embodiment of the present invention
  • FIG. 5 is a partial cross-sectional view of a sealing part with a water penetration preventing member according to another embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a pouch type secondary battery manufacturing method according to an embodiment of the present invention.
  • FIG. 3 is a view illustrating a configuration of a pouch type secondary battery with a moisture penetration preventing member according to an embodiment of the present invention
  • FIG. 4 is a portion of a sealing part with a moisture penetration preventing member according to an embodiment of the present invention. It is a cross section.
  • the secondary battery according to the present invention includes a case 110a and 110b, an electrode assembly 120, an electrode tab 130, an electrode lead 140, a sealing unit 160, and the sealing. And a moisture penetration preventing member 170 attached to the portion.
  • the case includes an upper pouch case 110a and a lower pouch case 11b, each of which has a periphery sealed by a heat fusion process to accommodate the electrode assembly therein.
  • the pouch case may be an aluminum laminate sheet.
  • the electrode assembly 120 is mounted at a position corresponding to the receiving portion between the upper pouch case 110a and the lower pouch case 11b, and then heat-sealed and seal the peripheral portion of the pouch case through a heat fusion process.
  • the electrode assembly 120 includes a positive electrode plate, a negative electrode plate, and a separator. That is, the electrode assembly 120 is insulated from each other by sequentially stacking the positive electrode plate and the negative electrode plate in the state where the separator is interposed.
  • the electrode assembly 120 may be formed in various structures such as a wound type, a stacked type, or a stack / fold type according to an embodiment.
  • the positive electrode plate is formed of a metal thin plate having excellent conductivity, for example, a positive electrode current collector made of aluminum (Al) foil and a positive electrode active material layer coated on both surfaces thereof.
  • the positive electrode plate may have a positive electrode current collector region, that is, a positive electrode non-coating portion, on which both surfaces of the positive electrode active material layer are not formed.
  • the positive electrode plate may be bonded to a positive electrode tab formed of a metal material such as aluminum (Al) at one end of the positive electrode non-coating portion.
  • the negative electrode plate includes a negative electrode current collector made of a conductive metal thin plate, for example, copper (Cu) foil, and a negative electrode active material layer coated on both surfaces thereof.
  • the negative electrode plate has negative electrode collector regions, that is, negative electrode non-coating portions, on both sides of which negative electrode active material layers are not formed.
  • the negative electrode plate may be bonded to a negative electrode tab formed of a metal material, for example, nickel (Ni), at one end thereof.
  • a negative electrode tab formed of a metal material, for example, nickel (Ni), at one end thereof.
  • two or more negative electrode plates may be included according to the shape of the electrode assembly 120, and particularly, in the case of a stacked electrode assembly, many may be included.
  • the separator may be positioned between the positive electrode plate and the negative electrode plate to electrically insulate the positive electrode plate and the negative electrode plate from each other, and may be formed in the form of a porous membrane so that lithium ions or the like may pass between the positive electrode plate and the negative electrode plate.
  • a separator may be made of, for example, a porous membrane using polyethylene (PE) or polypropylene (PP) or a composite film thereof.
  • the electrode tab 130 extends from the electrode assembly 120.
  • the electrode tab 130 may not be directly exposed to the outside of the cases 110a and 110b and may be connected to another component such as the electrode lead 140.
  • the electrode lead 140 is electrically connected to the electrode tab 130.
  • One end of the electrode lead 140 is connected to the electrode tab 130, and the other end is exposed to the outside of the cases 110a and 110b, and the other end exposed to the outside may function as an electrode terminal. Therefore, the secondary battery may be charged and discharged by connecting a charger or a load to the other end of the electrode lead 140.
  • an insulating film 150 may be attached to a portion of the upper and lower surfaces of the electrode lead 140 to increase the degree of sealing with the battery case and to secure an electrically insulating state.
  • the sealing unit 160 may be formed around the outside of the pouch by bonding or adhering the upper pouch case 110a and the lower pouch case 110b by heat fusion or the like in the sealing process of the pouch type case. However, even when the sealing unit 160 is formed through the sealing process as described above, if the bonding is not properly made, moisture may penetrate from the outside through the sealing unit 160, and even a very small amount of water penetrates into the battery. This may accelerate the aging of the battery may present a risk of explosion, and may also reduce the life of the battery.
  • the penetration of moisture may be prevented by attaching the moisture penetration preventing member 170 to the entire circumference of the edge of the pouch case in which the sealing portion 160 is formed.
  • the moisture penetration preventing member 170 is an end of the sealing portion 160 formed on the edge of the pouch case by the welding method (eg, ultrasonic welding, laser welding, etc.) and the upper and lower surfaces of the sealing portion 160. It can be attached including all.
  • the penetration of moisture penetrates through the gap of the inner resin layer where the upper pouch case 110a and the lower pouch case 110b are coupled to each other during the heat fusion process when the sealing unit 160 is formed.
  • the moisture penetration preventing member 170 attached to the formed sealing part 160 has a height H attached to the upper and lower portions of the sealing part 160 in a width direction W attached to an end of the sealing part 160. It may be preferable to form a thicker than the () direction to form a distance that can penetrate moisture from the outside.
  • the moisture penetration preventing member 170 may be a film such as polyethylene terephthalate (PET), the polyethylene terephthalate (PET) is a saturated polyester obtained by polycondensation of terephthalic acid and ethylene glycol, It is less affected by temperature and humidity and has less absorbency.
  • PET polyethylene terephthalate
  • the moisture penetration preventing member 170 is not limited thereto and may be any material that can prevent moisture penetration.
  • adhesives, sealants and waterproofing materials such as silicone based, epoxy based, cyanoacrylic acid based, polyvinyl acrylate based, ethylene vinyl acetate based, acrylate based, polychloroprene based, polyurethane resin and polyester resin Any one selected from the group consisting of a mixture of polyols and polyureten resins, a mixture of acrylic polymers and polyurethane resins, a polyimide series and a mixture of cyanoacrylates and urethanes, or a mixture of two or more thereof Can be used.
  • the moisture penetration preventing member 170 may be used either alone or a mixture of epoxy-based resin and silicone-based resin.
  • a configuration that can block the step by step even if the moisture is penetrated is shown through the embodiment of FIG.
  • FIG. 5 is a partial cross-sectional view of a sealing part to which a moisture penetration preventing member is attached according to another embodiment of the present invention, in which a hole 510 is formed in the sealing portion 160, and the hole 510 is a moisture penetration preventing member 170. Filled with) Such a configuration is to block the water when water penetrates into the gap due to a crack in the water penetration preventing member 170 attached to the end of the sealing portion 160.
  • the hole 510 is formed by pressing the sealing part 160 formed at the edge of the pouch case with a mold jig having a plurality of protrusions. At this time, the hole 510 is preferably formed wide in the longitudinal direction in which the electrode lead is formed. At this time, in the embodiment of the present invention, the hole 510 is described as being formed in a rectangular shape to serve as a blocking film, but is not limited thereto, and may be variously adopted as long as it can block moisture from the outside.
  • the water penetration preventing member 170 is filled into the hole 510 by welding, and the moisture penetration preventing member 170 is attached to the entire sealing portion 160 formed at the edge of the pouch case by welding. Even if a crack occurs in the moisture penetration preventing member 170 adhered to an end of the sealing portion 160 and water penetrates into the gap, the moisture is gradually blocked by the moisture penetration preventing member filled in the hole 510. It is possible to effectively prevent the penetration of moisture from the outside.
  • the sealing portion can be more firmly bonded.
  • FIG. 6 is a flowchart illustrating a pouch type secondary battery manufacturing method according to an embodiment of the present invention.
  • an upper pouch case 110a is illustrated.
  • an electrode assembly 120 having a pouch case consisting of a bottom pouch case 110b and a positive electrode plate and a negative electrode plate disposed therebetween.
  • the electrode assembly 120 is accommodated in the pouch case, and the upper pouch case 110a and the lower pouch case 110b are heat-sealed to form a sealing unit 160 (S610) (S630).
  • the water permeation prevention film 170 is attached to the edge of the pouch case including the end of the sealing part 160 and the upper and lower surfaces of the sealing part 160.
  • the moisture penetration preventing filtrate 170 may be attached to the sealing unit 160 by a welding method (eg, ultrasonic welding, laser welding, etc.) (S650).
  • the penetration of moisture penetrates through the gap of the inner resin layer where the upper pouch case 110a and the lower pouch case 110b are coupled to each other during the heat fusion process when the sealing unit 160 is formed.
  • the moisture penetration preventing member 170 attached to the formed sealing part 160 has a height H attached to the upper and lower portions of the sealing part 160 in a width direction W attached to an end of the sealing part 160. It may be preferable to form a thicker than the () direction to form a distance that can penetrate moisture from the outside.
  • the moisture penetration preventing member 170 may be a film such as polyethylene terephthalate (PET), the polyethylene terephthalate (PET) is a saturated polyester obtained by polycondensation of terephthalic acid and ethylene glycol, It is less affected by temperature and humidity and has less absorbency.
  • PET polyethylene terephthalate
  • the moisture penetration preventing member 170 is not limited thereto and may be any material that can prevent moisture penetration.
  • adhesives, sealants and waterproofing materials such as silicone based, epoxy based, cyanoacrylic acid based, polyvinyl acrylate based, ethylene vinyl acetate based, acrylate based, polychloroprene based, polyurethane resin and polyester resin Any one selected from the group consisting of a mixture of polyols and polyureten resins, a mixture of acrylic polymers and polyurethane resins, a polyimide series and a mixture of cyanoacrylates and urethanes, or a mixture of two or more thereof Can be used.
  • the moisture penetration preventing member 17 may be used either alone or a mixture of epoxy-based resin and silicone-based resin.
  • a hole may be formed before attaching the moisture penetrating preventing member 170 to the sealing unit 160 to block it step by step.
  • the moisture penetration preventing member 170 is formed in the hole 510 formed in the sealing part 160. It can be filled more effectively to prevent the penetration of moisture from the outside.
  • the hole 510 may be formed by pressing the sealing part 160 formed at the edge of the pouch case with a mold jig having a plurality of protrusions, and the hole 510 may be formed in a length direction in which the electrode lead is formed. It is desirable to.
  • the hole 510 is described as being formed in a rectangular shape to serve as a blocking film, but is not limited thereto, and may be variously adopted as long as it can block moisture from the outside.
  • the water penetration preventing member 170 is filled into the hole 510 by welding, and the moisture penetration preventing member 170 is attached to the entire sealing portion 160 formed at the edge of the pouch case by welding. Even if a crack occurs in the moisture penetration preventing member 170 adhered to the end of the seal portion 160, even if moisture penetrates into the gap, moisture is gradually stepped by the moisture penetration preventing member 170 filled in the hole 510. By blocking, water can be prevented from penetrating more effectively from the outside.

Abstract

A pouch-type secondary battery is disclosed. The pouch-type secondary battery, according to the present invention, comprises: an electrode assembly having a cathode plate and an anode plate arranged by placing a separator therebetween; and a pouch-type case which has the electrode assembly and an electrolyte accommodated and packaged therein, and which has a sealing portion formed along the edge thereof, wherein a water permeation prevention member is capable of being attached, by welding, to the entirety of the sealing portion formed at the edge of the pouch-type case.

Description

수분 침투를 방지할 수 있는 파우치형 이차전지Pouch type secondary battery that can prevent moisture penetration
본 발명은 이차전지에 관한 것으로서, 더욱 상세하게는 수분의 침투를 방지할 수 있는 파우치형 이차전지에 관한 것이다.The present invention relates to a secondary battery, and more particularly to a pouch type secondary battery that can prevent the penetration of moisture.
본 출원은 2013년 11월 1일에 출원된 한국특허출원 제10-2013-0132440호 및 2014년 10월 31일에 출원된 한국특허출원 제10-2014-0150287호에 기초한 우선권을 주장하며, 해당 출원의 명세서 및 도면에 개시된 모든 내용은 본 출원에 원용된다.This application claims the priority based on Korea Patent Application No. 10-2013-0132440 filed on November 1, 2013 and Korea Patent Application No. 10-2014-0150287 filed on October 31, 2014, All content disclosed in the specification and drawings of an application is incorporated in this application.
일반적으로, 이차 전지는 충전이 불가능한 일차 전지와 달리, 충방전이 가능한 전지를 의미하며, 휴대폰, 노트북 컴퓨터, 캠코더 등의 전자기기 또는 전기 자동차 등에 널리 사용되고 있다. 특히, 리튬 이차 전지는 작동 전압이 3.6V 가량으로서, 전자 장비의 전원으로 많이 사용되는 니켈-카드뮴 전지 또는 니켈-수소 전지보다 약 3배의 용량을 가지며, 단위 중량당 에너지 밀도가 높기 때문에 그 활용 정도가 급속도로 증가되는 추세에 있다.In general, a secondary battery, unlike a primary battery that cannot be charged, means a battery that can be charged and discharged, and is widely used in electronic devices such as mobile phones, notebook computers, camcorders, and electric vehicles. In particular, the lithium secondary battery has an operating voltage of about 3.6V, and has about three times the capacity of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and has a high energy density per unit weight. The degree is increasing rapidly.
이러한 리튬 이차 전지는 주로 리튬계 산화물과 탄소재를 각각 양극 활물질과 음극 활물질로 사용한다. 리튬 이차 전지는, 이러한 양극 활물질과 음극 활물질이 각각 도포된 양극판과 음극판이 세퍼레이터를 사이에 두고 배치된 전극 조립체와 전극 조립체를 전해액과 함께 밀봉 수납하는 외장재, 즉 전지 케이스를 구비한다.Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. The lithium secondary battery includes an electrode assembly having a positive electrode plate and a negative electrode plate coated with the positive electrode active material and the negative electrode active material, respectively, with a separator interposed therebetween, and an exterior member for sealingly accommodating the electrode assembly together with the electrolyte, that is, a battery case.
한편, 리튬 이차 전지는 전지 케이스의 형상에 따라, 전극 조립체가 금속 캔에 내장되어 있는 캔형 이차 전지와 전극 조립체가 알루미늄 라미네이트 시트의 파우치에 내장되어 있는 파우치형 이차 전지로 분류될 수 있다.Meanwhile, according to the shape of a battery case, a lithium secondary battery may be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can and a pouch type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet.
도 1은 종래 기술에 따른 파우치형 이차 전지의 구성을 개략적으로 나타낸 도면이다.1 is a view schematically showing the configuration of a pouch type secondary battery according to the prior art.
도 1을 참조하면, 파우치형 이차전지는 케이스, 전극 조립체, 전극탭, 전극리드 및 실링부를 포함한다.Referring to FIG. 1, a pouch type secondary battery includes a case, an electrode assembly, an electrode tab, an electrode lead, and a sealing part.
케이스(11)는 상부 파우치 케이스 및 하부 파우치 케이스를 포함하는 것으로, 후술할 전극조립체(12), 전극탭(13) 및 전극리드(14)를 수용할 수 있는 크기로 형성될 수 있으며, 그 외측부에는 상기 상부 및 하부 케이스를 열융착시킴에 따라 형성되는 실링부(16)를 포함한다.The case 11 includes an upper pouch case and a lower pouch case, and may be formed to have a size that can accommodate the electrode assembly 12, the electrode tab 13, and the electrode lead 14, which will be described later. It includes a sealing portion 16 formed by heat-sealing the upper and lower cases.
전극조립체(12)는 양극판, 음극판 및 세퍼레이터를 포함한다. 전극조립체(12)는 세퍼레이터가 개재된 상태에서 양극판과 음극판이 순차적으로 적층될 수 있다. 전극조립체(12)는 대표적으로, 긴 시트형의 양극들과 음극들을 세퍼레이터가 개재된 상태에서 권취한 구조의 젤리-롤(권취형) 전극조립체, 소정 크기의 단위로 절취한 다수의 양극과 음극들을 세퍼레이터를 개재한 상태로 순차적으로 적층한 스택형(적층형) 전극조립체, 소정 단위의 양극과 음극들을 세퍼레이터를 개재한 상태로 적층한 바이셀(Bicell) 또는 풀셀(Full cell)들을 권취한 구조의 스택/폴딩형 전극조립체 등을 들 수 있다.The electrode assembly 12 includes a positive electrode plate, a negative electrode plate, and a separator. In the electrode assembly 12, the positive electrode plate and the negative electrode plate may be sequentially stacked in a state where a separator is interposed therebetween. The electrode assembly 12 typically includes a jelly-roll (wound) electrode assembly having a structure in which long sheets of positive and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive and negative electrodes cut in units of a predetermined size. Stacked electrode assembly sequentially stacked with separators interposed therebetween, stacks of bicell or full cells wound with stacked positive and negative electrodes in a predetermined unit via separators And a folding type electrode assembly.
전극탭(13)은 전극조립체(12)로부터 연장된다. 예를 들어, 양극탭은 양극판으로부터 연장되고, 음극탭은 음극판으로부터 연장된다. 여기서, 전극조립체(12)가 다수의 양극판 및 다수의 음극판이 적층된 상태로 구성된 경우, 전극탭(13)은 각각의 양극판 및 음극판으로부터 연장된다. 이때, 전극탭(13)은 케이스(11)의 외부로 직접 노출되지 않고, 전극리드(14)와 같은 다른 구성요소에 연결될 수 있다.The electrode tab 13 extends from the electrode assembly 12. For example, the positive electrode tab extends from the positive plate and the negative electrode tab extends from the negative plate. Here, when the electrode assembly 12 is configured in a state where a plurality of positive electrode plates and a plurality of negative electrode plates are stacked, the electrode tabs 13 extend from the respective positive electrode plates and the negative electrode plates. In this case, the electrode tab 13 may not be directly exposed to the outside of the case 11, but may be connected to another component such as the electrode lead 14.
전극리드(14)는 양극판 또는 음극판으로부터 각각 연장된 전극탭(13)들과 일부분이 전기적으로 연결되어 있다. 즉, 양극리드는 양극탭과 결합되어 서로 전기적으로 연결되고, 음극리드는 음극탭과 결합되어 서로 전기적으로 연결된다. 또한, 전극리드(14)의 상하면 일부에는 전지 케이스(11)와의 밀봉도를 높이고 동시에 전기적 절연 상태를 확보하기 위하여 절연필름(15)이 부착될 수 있다.The electrode lead 14 is electrically connected to portions of the electrode tabs 13 extending from the positive electrode plate or the negative electrode plate, respectively. That is, the positive lead is coupled to the positive electrode tab and electrically connected to each other, and the negative lead is coupled to the negative electrode tab and electrically connected to each other. In addition, an insulating film 15 may be attached to a portion of the upper and lower surfaces of the electrode lead 14 in order to increase the degree of sealing with the battery case 11 and to secure an electrically insulating state.
상기와 같은 종래 기술에 따른 파우치형 이차 전지는 전극 조립체를 파우치형 케이스에 투입한 후, 전해액을 주입하고 밀봉 공정, 에이징 공정, 화성 공정 등의 후처리 공정을 거쳐 하나의 완성된 이차 전지가 된다.The pouch-type secondary battery according to the prior art as described above becomes a complete secondary battery after the electrode assembly is put into the pouch-type case, the electrolyte is injected, and after the post-treatment process such as sealing process, aging process, chemical conversion process, etc. .
실링부(15)는 상기 파우치형 케이스의 밀봉 공정에서 상부 케이스 및 하부 케이스가 열융착 등에 의해 접합 내지 접착되어 케이스의 외측 둘레에 형성될 수 있으며, 바람직하게 실링부(15)는 상기 열융착 등에 의해 상기 상,하부 케이스가 맞닿는 부분에 형성되는 열융착층의 띠를 의미한다.The sealing part 15 may be formed around the outer periphery of the case by bonding or bonding the upper case and the lower case by heat fusion or the like in the sealing process of the pouch-type case. By means of the band of the heat-sealing layer formed in the portion where the upper, lower case abuts.
도 2는 도 1의 파우치형 케이스의 실링부를 형성하는 과정을 단면을 도시한 도면이다.2 is a cross-sectional view illustrating a process of forming a sealing part of the pouch type case of FIG. 1.
도 2를 참조하면, 라미네이트 시트(20)는 최외각을 이루는 외측 수지층(20a), 물질의 관통을 방지하는 차단성 금속층(20b), 및 밀봉을 위한 내측 수지층(20c)으로 구성되어 있다.Referring to FIG. 2, the laminate sheet 20 is composed of an outer resin layer 20a forming an outermost shell, a barrier metal layer 20b that prevents penetration of a material, and an inner resin layer 20c for sealing. .
외측 수지층(20a)은 외부로부터 전지를 보호하는 역할을 하므로 두께 대비 우수한 인장강도와 내후성 등이 요구되며, 일반적으로 ONy(연신 나일론)이 많이 사용되고 있다. 차단성 금속층(20b)은 공기, 습기 등이 전지의 내부로 유입되는 것을 방지하는 역할을 하며, 일반적으로 알루미늄(Al)이 많이 사용되고 있다. 내측 수지층(20c)은 전극조립체를 내장한 상태에서 인가된 열과 압력에 의해 상호 열융착되어 밀봉성을 제공하는 역할을 하며, 일반적으로 CPP(casting polypropylene: 무연신 폴리프로필렌)가 많이 사용되고 있다.Since the outer resin layer 20a serves to protect the battery from the outside, excellent tensile strength and weather resistance to thickness are required, and ONy (stretched nylon) is generally used. The blocking metal layer 20b serves to prevent air, moisture, and the like from flowing into the battery, and aluminum is generally used. The inner resin layer 20c is thermally fused by heat and pressure applied in a state in which the electrode assembly is embedded, thereby providing a sealing property, and generally CPP (casting polypropylene) is used.
이러한 다층 구조의 라미네이트 시트(20)는 실링부에서 내측 수지층(20c)이 서로 대면하는 구조를 이루며, 이러한 내측 수지층(20c)은 열융착에 의해 서로 결합된다. 따라서, 라미네이트 시트(20)가 결합된 단부에서 내측 수지층(20c)이 외부에 노출되고, 주로 고분자 수지로 되어 있는 내측 수지층(20c)은 수분의 침투가 용이하고 전해액의 누액 가능성이 존재하므로, 장기간 사용시 전지의 수명 및 안정성을 저해하는 요인으로 작용한다.The multilayer sheet 20 of this multi-layer structure forms a structure in which the inner resin layers 20c face each other in the sealing portion, and the inner resin layers 20c are bonded to each other by thermal fusion. Therefore, the inner resin layer 20c is exposed to the outside at the end where the laminate sheet 20 is bonded, and the inner resin layer 20c mainly made of a polymer resin easily penetrates moisture and there is a possibility of leakage of electrolyte solution. In case of prolonged use, it acts as a factor to impair battery life and stability.
본 발명은 상기와 같은 문제점을 해결하기 위하여 창출된 것으로서, 파우치 케이스에 형성된 실링부에 수분 침투 방지 부재를 부착하여 외부로부터의 수분 침투를 방지할 수 있는 리튬이차전지를 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, an object of the present invention is to provide a lithium secondary battery that can prevent the ingress of moisture from the outside by attaching a moisture intrusion prevention member to the sealing portion formed in the pouch case.
상기와 같은 목적을 달성하기 위한 본 발명의 일 측면에 따른 파우치형 이차 전지는, 양극판과 음극판이 세퍼레이터를 사이에 두고 배치된 전극 조립체; 및 상기 전극 조립체 및 전해액을 내부에 수납하고 패키징 한 후, 가장자리를 따라 실링부가 형성된 파우치형 케이스;를 포함하고, 상기 파우치형 케이스의 가장자리에 형성된 실링부 전체에 수분 침투 방지 부재가 용접에 의해 부착될 수 있다.According to an aspect of the present invention, a pouch type secondary battery includes: an electrode assembly in which a positive electrode plate and a negative electrode plate are disposed with a separator interposed therebetween; And a pouch-shaped case having a sealing portion formed along an edge after accommodating and packaging the electrode assembly and the electrolyte therein, wherein the moisture penetration preventing member is attached to the entire sealing portion formed at the edge of the pouch-shaped case by welding. Can be.
상기 수분 침투 방지 부재는 실링부의 단부에 부착된 폭 방향이 실링부의 상,하부에 부착된 높이 방향보다 두껍게 형성되어 용접에 의해 부착될 수 있다.The moisture penetration preventing member may have a width direction attached to an end portion of the sealing portion thicker than a height direction attached to the upper and lower portions of the sealing portion, and may be attached by welding.
상기 실링부는 다수의 돌기가 형성된 금형 지그에 의해 가압되어 홀이 형성되고, 상기 수분 침투 방지 부재는 용접에 의해 상기 홀을 메우고, 실링부 전체에 부착될 수 있다.The sealing part may be pressed by a mold jig having a plurality of protrusions to form a hole, and the moisture penetration preventing member may fill the hole by welding, and may be attached to the entire sealing part.
상기 홀은 전극리드가 형성된 길이 방향으로 사각형 모양으로 형성될 수 있다.The hole may be formed in a rectangular shape in the longitudinal direction in which the electrode lead is formed.
상기 수분 침투 방지 부재는 폴리에틸렌테레프탈레이트(PET)일 수 있다.The moisture penetration preventing member may be polyethylene terephthalate (PET).
상기 수분 침투 방지 부재는 실리콘 계열, 에폭시 계열, 시아노아크릴산 계열, 폴리비닐아크릴레이트 계열, 에틸렌비닐아세테이트 계열, 아크릴레이트 계열, 폴르클로로프렌 계열, 폴리우레탄 수지와 폴리에스터 수지의 혼합체 계열, 폴리올과 폴리 우레텐 수지의 혼합체 계열, 아크릴릭 폴리머와 폴리우레탄 수지의 혼합체 계열, 폴리이미드 계열 및 시아노아크릴레이트와 우레탄의 혼합체 계열 중 선택되는 어느 하나 또는 이들 중 2종 이상의 혼합물일 수 있다.The moisture penetration preventing member may be a silicone series, an epoxy series, a cyanoacrylic acid series, a polyvinyl acrylate series, an ethylene vinyl acetate series, an acrylate series, a polychloroprene series, a mixture series of a polyurethane resin and a polyester resin, a polyol and a poly It may be any one selected from the group consisting of a mixture of a urethane resin, a mixture of an acrylic polymer and a polyurethane resin, a polyimide series, and a mixture of a cyanoacrylate and a urethane, or a mixture of two or more thereof.
상기 수분 침투 방지 부재는 에폭시 계열 수지 및 실리콘 계열 수지 중 어느 하나 또는 이들의 혼합물일 수 있다.The moisture penetration preventing member may be any one or a mixture of an epoxy resin and a silicone resin.
본 발명의 일 측면에 따르면 리튬 이차 전지의 파우치형 케이스의 실링부에 수분 침투 방지 부재를 부착함으로써 외부로부터의 수분 침투를 방지하여 전지의 노화 발생을 방지함에 따라 전지의 수명을 길게 할 수 있는 효과가 있다.According to an aspect of the present invention by attaching a moisture intrusion prevention member to the sealing portion of the pouch-type case of the lithium secondary battery to prevent moisture ingress from the outside to prevent the aging of the battery to prolong the life of the battery effect There is.
또한, 수분 침투 방지 부재는 실링부의 단부에 부착된 폭 방향을 실링부의 상, 하부에 부착된 높이 방향보다 두껍게 형성하여 보다 효과적으로 수분 침투를 방지할 수 있다.In addition, the moisture penetration preventing member may form a width direction attached to the end of the sealing portion thicker than the height direction attached to the upper and lower portions of the sealing portion, thereby preventing water penetration more effectively.
본 발명의 다른 측면에 따르면, 실링부를 다수의 돌기가 형성된 금형 지그로 가압하여 홀을 형성하고, 상기 홀을 필름을 용접하여 메꾼 후, 실링부에 필름을 부착함으로써 수분 침투 방지를 보다 효과적으로 방지할 수 있다.According to another aspect of the present invention, by pressing the sealing part with a mold jig formed with a plurality of protrusions to form a hole, and welding the film to fill the hole, by attaching a film to the sealing part to prevent water penetration more effectively. Can be.
또한, 리튬 이차 전지의 파우치형 케이스의 실링부에 필름과 같은 수분 침투 방지 부재를 부착함으로써 상기 실링부를 보다 견고히 결합시킬 수 있다.In addition, by attaching a moisture penetration preventing member such as a film to the sealing portion of the pouch type case of the lithium secondary battery, the sealing portion can be more firmly bonded.
본 명세서에 첨부되는 다음의 도면들은 본 발명의 바람직한 실시 예를 예시하는 것이며, 후술되는 발명의 상세한 설명과 함께 본 발명의 기술사상을 더욱 이해시키는 역할을 하는 것이므로, 본 발명은 그러한 도면에 기재된 사항에만 한정되어 해석되어서는 아니 된다.The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve as a further understanding of the spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
도 1은 종래 기술에 따른 파우치형 이차 전지의 분해 사시도,1 is an exploded perspective view of a pouch type secondary battery according to the prior art,
도 2는 도 1의 파우치형 케이스의 실링부를 형성하는 과정의 단면을 도시한 도면,2 is a cross-sectional view illustrating a process of forming a sealing part of the pouch-shaped case of FIG. 1;
도 3은 본 발명의 일 실시 예에 따른 수분 침투 방지 부재가 부착된 파우치형 이차전지의 구성을 도시한 도면,3 is a view illustrating a configuration of a pouch type secondary battery with a moisture penetration preventing member according to an embodiment of the present invention;
도 4는 본 발명의 일 실시 예에 따른 수분 침투 방지 부재가 부착된 실링부의 부분 단면도,4 is a partial cross-sectional view of a sealing part with a water penetration preventing member according to an embodiment of the present invention;
도 5는 본 발명의 다른 실시 예에 따른 수분 침투 방지 부재가 부착된 실링부의 부분 단면도,5 is a partial cross-sectional view of a sealing part with a water penetration preventing member according to another embodiment of the present invention;
도 6은 본 발명의 일 실시 예에 따른 파우치형 이차 전지 제조 방법을 나타내는 흐름도이다.6 is a flowchart illustrating a pouch type secondary battery manufacturing method according to an embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예를 상세히 설명하기로 한다. 이에 앞서, 본 명세서 및 청구범위에 사용된 용어나 단어는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서, 본 명세서에 기재된 실시 예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일 실시 예에 불과할 뿐이고, 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형 예들이 있을 수 있음을 이해하여야 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are consistent with the technical spirit of the present invention on the basis of the principle that the concept of the term may be appropriately defined in order to best explain the invention of its own. It must be interpreted as meaning and concept. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.
도 3은 본 발명의 일 실시 예에 따른 수분 침투 방지 부재가 부착된 파우치형 이차전지의 구성을 도시한 도면, 도 4는 본 발명의 일 실시 예에 따른 수분 침투 방지 부재가 부착된 실링부의 부분 단면도이다.3 is a view illustrating a configuration of a pouch type secondary battery with a moisture penetration preventing member according to an embodiment of the present invention, and FIG. 4 is a portion of a sealing part with a moisture penetration preventing member according to an embodiment of the present invention. It is a cross section.
도 3 내지 도 4를 참조하면, 본 발명에 따른 이차전지는 케이스(110a)(110b), 전극 조립체(120), 전극탭(130), 전극리드(140), 실링부(160) 및 상기 실링부에 부착되는 수분 침투 방지 부재(170)를 포함한다.3 to 4, the secondary battery according to the present invention includes a case 110a and 110b, an electrode assembly 120, an electrode tab 130, an electrode lead 140, a sealing unit 160, and the sealing. And a moisture penetration preventing member 170 attached to the portion.
케이스는 내부에 전극 조립체를 수용할 수 있도록 열융착 공정에 의해 주변부가 실링된 상부 파우치 케이스(110a)와 하부 파우치 케이스(11b)로 이루어진다. 이때, 상기 파우치 케이스는 알루미늄 라미네이트 시트일 수 있다. 상기 전극 조립체(120)는 상부 파우치 케이스(110a)와 하부 파우치 케이스(11b) 사이의 수용부에 대응되는 위치에 탑재된 후 열융착 공정을 통해 상기 파우치 케이스의 주변부를 열융착하여 실링하는 과정을 거친다.The case includes an upper pouch case 110a and a lower pouch case 11b, each of which has a periphery sealed by a heat fusion process to accommodate the electrode assembly therein. In this case, the pouch case may be an aluminum laminate sheet. The electrode assembly 120 is mounted at a position corresponding to the receiving portion between the upper pouch case 110a and the lower pouch case 11b, and then heat-sealed and seal the peripheral portion of the pouch case through a heat fusion process. Rough
전극조립체(120)는 양극판, 음극판 및 세퍼레이터를 포함한다. 즉, 전극조립체(120)는 세퍼레이터가 개재된 상태에서 양극판과 음극판이 순차적으로 적층 되어 서로 절연되어 있다. 전극조립체(120)는 실시형태에 따라 권취형, 스택형 또는 스택/폴딩형 등으로 다양한 구조로 형성될 수 있다.The electrode assembly 120 includes a positive electrode plate, a negative electrode plate, and a separator. That is, the electrode assembly 120 is insulated from each other by sequentially stacking the positive electrode plate and the negative electrode plate in the state where the separator is interposed. The electrode assembly 120 may be formed in various structures such as a wound type, a stacked type, or a stack / fold type according to an embodiment.
양극판은 도전성이 우수한 금속 박판, 예를 들면 알루미늄(Al) 호일(foil)로 이루어진 양극 집전체와 그 양면에 코팅된 양극 활물질층을 포함하여 형성된다. 양극판은 양 면에 양극 활물질층이 형성되지 않은 양극 집전체 영역, 즉 양극 무지부가 형성될 수 있다. 그리고, 양극판은 양극 무지부의 일측단에 금속 재질 이를 테면 알루미늄(Al) 재질로 형성되는 양극탭이 접합될 수 있다.The positive electrode plate is formed of a metal thin plate having excellent conductivity, for example, a positive electrode current collector made of aluminum (Al) foil and a positive electrode active material layer coated on both surfaces thereof. The positive electrode plate may have a positive electrode current collector region, that is, a positive electrode non-coating portion, on which both surfaces of the positive electrode active material layer are not formed. In addition, the positive electrode plate may be bonded to a positive electrode tab formed of a metal material such as aluminum (Al) at one end of the positive electrode non-coating portion.
음극판은 전도성 금속 박판, 예를 들면 구리(Cu) 호일로 이루어진 음극 집전체와, 그 양면에 코팅된 음극 활물질층을 포함하고 있다. 음극판은 양 측부에 음극활물질층이 형성되지 않은 음극 집전체 영역, 즉 음극 무지부가 형성된다. 그리고, 음극판은 일측단에 금속 재질, 이를테면 니켈(Ni) 재질로 형성되는 음극탭이 접합될 수 있다. 음극판 역시, 양극판과 마찬가지로 전극조립체(120)의 형태에 따라 둘 이상 포함될 수 있으며, 특히 스택형 전극조립체의 경우, 다수 포함될 수 있다.The negative electrode plate includes a negative electrode current collector made of a conductive metal thin plate, for example, copper (Cu) foil, and a negative electrode active material layer coated on both surfaces thereof. The negative electrode plate has negative electrode collector regions, that is, negative electrode non-coating portions, on both sides of which negative electrode active material layers are not formed. In addition, the negative electrode plate may be bonded to a negative electrode tab formed of a metal material, for example, nickel (Ni), at one end thereof. Like the positive electrode plate, two or more negative electrode plates may be included according to the shape of the electrode assembly 120, and particularly, in the case of a stacked electrode assembly, many may be included.
세퍼레이터는 양극판과 음극판 사이에 위치하여, 양극판과 음극판을 서로 전기적으로 절연시키며, 양극판과 음극판 사이에서 리튬 이온 등이 서로 통과할 수 있도록 다공성막 형태로 형성될 수 있다. 이러한 세퍼레이터는, 예를 들어 폴리에틸렌(PE) 또는 폴리프로필렌(PP) 또는 이들의 복합필름을 사용한 다공성막으로 이루어질 수 있다.The separator may be positioned between the positive electrode plate and the negative electrode plate to electrically insulate the positive electrode plate and the negative electrode plate from each other, and may be formed in the form of a porous membrane so that lithium ions or the like may pass between the positive electrode plate and the negative electrode plate. Such a separator may be made of, for example, a porous membrane using polyethylene (PE) or polypropylene (PP) or a composite film thereof.
전극탭(130)은 전극조립체(120)로부터 연장된다. 이러한 전극탭(130)은 케이스(110a)(110b)의 외부로 직접 노출되지 않고, 전극리드(140)와 같은 다른 구성 요소에 연결될 수 있다.The electrode tab 130 extends from the electrode assembly 120. The electrode tab 130 may not be directly exposed to the outside of the cases 110a and 110b and may be connected to another component such as the electrode lead 140.
전극리드(140)는 전극탭(130)과 전기적으로 연결된다. 이러한 전극리드(140)는 일단이 전극탭(130)과 연결되고, 타단이 케이스(110a)(110b)의 외부로 노출되어, 외부로 노출된 타단이 전극단자로서 기능을 할 수 있다. 따라서, 이러한 전극리드(140)의 타단에 충전기나 부하 등이 연결됨으로써 이차전지는 충방전 될 수 있다. 또한, 전극리드(140)의 상하면 일부에는 전지 케이스와의 밀봉도를 높이고 동시에 전기적 절연 상태를 확보하기 위하여 절연필름(150)이 부착될 수 있다.The electrode lead 140 is electrically connected to the electrode tab 130. One end of the electrode lead 140 is connected to the electrode tab 130, and the other end is exposed to the outside of the cases 110a and 110b, and the other end exposed to the outside may function as an electrode terminal. Therefore, the secondary battery may be charged and discharged by connecting a charger or a load to the other end of the electrode lead 140. In addition, an insulating film 150 may be attached to a portion of the upper and lower surfaces of the electrode lead 140 to increase the degree of sealing with the battery case and to secure an electrically insulating state.
실링부(160)는 상기 파우치형 케이스의 밀봉 공정에서 상부 파우치 케이스(110a)와 하부 파우치 케이스(110b)가 열융착 등에 의해 접합 내지 접착되어 파우치의 외측 둘레에 형성될 수 있다. 하지만 상기와 같이 밀봉 공정을 거쳐 실링부(160)가 형성되더라도 접합이 제대로 이루어지지 않으면, 상기 실링부(160)를 통해 외부에서 수분이 침투할 수 있으며, 아주 적은 양의 수분이라도 전지 내부에 침투하게 되면 전지의 노화가 촉진되어 폭발의 위험성이 존재할 수 있으며, 전지의 수명 또한 줄어들 수 있다.The sealing unit 160 may be formed around the outside of the pouch by bonding or adhering the upper pouch case 110a and the lower pouch case 110b by heat fusion or the like in the sealing process of the pouch type case. However, even when the sealing unit 160 is formed through the sealing process as described above, if the bonding is not properly made, moisture may penetrate from the outside through the sealing unit 160, and even a very small amount of water penetrates into the battery. This may accelerate the aging of the battery may present a risk of explosion, and may also reduce the life of the battery.
따라서, 본 발명에서는 도 4에 도시된 바와 같이 상기 실링부(160)가 형성된 파우치 케이스의 가장자리 둘레 전체에 수분 침투 방지 부재(170)를 부착함으로써 수분의 침투를 방지할 수 있다. 이때, 상기 수분 침투 방지 부재(170)은 용접방식(예컨대, 초음파 용접, 레이저 용접 등)에 의해 파우치 케이스의 가장자리에 형성된 실링부(160)의 단부 및 상기 실링부(160)의 상, 하부면을 모두 포함하여 부착될 수 있다.Therefore, in the present invention, as shown in FIG. 4, the penetration of moisture may be prevented by attaching the moisture penetration preventing member 170 to the entire circumference of the edge of the pouch case in which the sealing portion 160 is formed. In this case, the moisture penetration preventing member 170 is an end of the sealing portion 160 formed on the edge of the pouch case by the welding method (eg, ultrasonic welding, laser welding, etc.) and the upper and lower surfaces of the sealing portion 160. It can be attached including all.
구체적으로, 수분의 침투는 실링부(160) 형성시 열융착 과정에서 상부 파우치 케이스(110a)와 하부 파우치 케이스(110b)가 서로 결합되는 내측 수지층의 빈틈을 통해 침투하므로, 파우치 케이스의 가장자리에 형성된 실링부(160)에 부착되는 수분 침투 방지 부재(170)는 상기 실링부(160)의 단부에 부착되는 폭 방향(W)을 상기 실링부(160)의 상, 하부에 부착되는 높이(H) 방향보다 두껍게 형성하여 외부로부터의 수분이 침투할 수 있는 거리를 보다 멀리 형성하는 것이 바람직할 수 있다.In detail, the penetration of moisture penetrates through the gap of the inner resin layer where the upper pouch case 110a and the lower pouch case 110b are coupled to each other during the heat fusion process when the sealing unit 160 is formed. The moisture penetration preventing member 170 attached to the formed sealing part 160 has a height H attached to the upper and lower portions of the sealing part 160 in a width direction W attached to an end of the sealing part 160. It may be preferable to form a thicker than the () direction to form a distance that can penetrate moisture from the outside.
이때, 상기 수분 침투 방지 부재(170)는 폴리에틸렌테레프탈레이트(polyethylene terephthalate : PET)와 같은 필름일 수 있으며, 상기 폴리에틸렌테레프탈레이트(PET)는 테레프탈산과 에틸렌글리콜을 중축합하여 얻을 수 있는 포화폴리에스테르로써, 온도 및 습도의 영향을 적게 받으며 흡수성이 적은 특징을 가지고 있다. 상기 수분 침투 방지 부재(170)는 이에 한하지 않으며, 수분 침투를 방지할 수 있는 물질이면 관계없다. 구체적으로, 접착제, 밀봉 및 방수제 계열의 물질 예컨대, 실리콘 계열, 에폭시 계열, 시아노아크릴산 계열, 폴리비닐아크릴레이트 계열, 에틸렌비닐아세테이트 계열, 아크릴레이트 계열, 폴르클로로프렌 계열, 폴리우레탄 수지와 폴리에스터 수지의 혼합체 계열, 폴리올과 폴리 우레텐 수지의 혼합체 계열, 아크릴릭 폴리머와 폴리우레탄 수지의 혼합체 계열, 폴리이미드 계열 및 시아노아크릴레이트와 우레탄의 혼합체 계열 중 선택되는 어느 하나 또는 이들 중 2종 이상의 혼합물을 사용할 수 있다. 바람직하게, 상기 수분 침투 방지 부재(170)는 에폭시 계열 수지 및 실리콘 계열 수지 중 어느 하나를 단독으로 또는 이들을 혼합하여 사용할 수 있다. 또한, 수분이 침투하더라도 이를 단계적으로 차단할 수 있는 구성이 도 5의 실시 예를 통해 도시되어 있다.In this case, the moisture penetration preventing member 170 may be a film such as polyethylene terephthalate (PET), the polyethylene terephthalate (PET) is a saturated polyester obtained by polycondensation of terephthalic acid and ethylene glycol, It is less affected by temperature and humidity and has less absorbency. The moisture penetration preventing member 170 is not limited thereto and may be any material that can prevent moisture penetration. Specifically, adhesives, sealants and waterproofing materials such as silicone based, epoxy based, cyanoacrylic acid based, polyvinyl acrylate based, ethylene vinyl acetate based, acrylate based, polychloroprene based, polyurethane resin and polyester resin Any one selected from the group consisting of a mixture of polyols and polyureten resins, a mixture of acrylic polymers and polyurethane resins, a polyimide series and a mixture of cyanoacrylates and urethanes, or a mixture of two or more thereof Can be used. Preferably, the moisture penetration preventing member 170 may be used either alone or a mixture of epoxy-based resin and silicone-based resin. In addition, a configuration that can block the step by step even if the moisture is penetrated is shown through the embodiment of FIG.
도 5는 본 발명의 다른 실시 예에 따른 수분 침투 방지 부재가 부착된 실링부의 부분 단면도로써, 실링부(160)에 홀(510)이 형성되고, 상기 홀(510)은 수분 침투 방지 부재(170) 로 채워져 있다. 이러한 구성은 실링부(160)의 단부에 부착되어 있는 수분 침투 방지 부재(170)에 균열이 생겨 그 틈으로 수분이 침투할 경우, 이를 차단하기 위함이다..5 is a partial cross-sectional view of a sealing part to which a moisture penetration preventing member is attached according to another embodiment of the present invention, in which a hole 510 is formed in the sealing portion 160, and the hole 510 is a moisture penetration preventing member 170. Filled with) Such a configuration is to block the water when water penetrates into the gap due to a crack in the water penetration preventing member 170 attached to the end of the sealing portion 160.
홀(510)은 파우치 케이스의 가장자리에 형성된 실링부(160)를 다수의 돌기가 형성된 금형 지그로 가압하여 형성한다. 이때, 상기 홀(510)은 전극리드가 형성된 길이 방향으로 넓게 형성되는 것이 바람직하다. 이때, 본 발명의 실시 예에서 상기 홀(510)은 차단막 역할을 할 수 있도록 사각형 모양으로 형성되는 것으로 설명하지만, 이에 한하지 않고, 외부로부터 수분을 차단할 수 있는 형태이면 다양하게 채택될 수 있다.The hole 510 is formed by pressing the sealing part 160 formed at the edge of the pouch case with a mold jig having a plurality of protrusions. At this time, the hole 510 is preferably formed wide in the longitudinal direction in which the electrode lead is formed. At this time, in the embodiment of the present invention, the hole 510 is described as being formed in a rectangular shape to serve as a blocking film, but is not limited thereto, and may be variously adopted as long as it can block moisture from the outside.
이후, 상기 홀(510)에 수분 침투 방지 부재(170)를 용접을 통해 채워 넣고, 파우치 케이스의 가장자리에 형성된 실링부(160) 전체에 용접을 통해 수분 침투 방지 부재(170)를 부착함으로써, 혹시라도 실링부(160)의 단부에 접착된 상기 수분 침투 방지 부재(170)에 균열이 생겨 그 틈으로 수분이 침투하더라도 상기 홀(510)에 채워진 수분 침투 방지 부재에 의해 단계적으로 수분이 차단됨으로써 보다 효과적으로 외부로부터 수분이 침투되는 것을 방지할 수 있다.Subsequently, the water penetration preventing member 170 is filled into the hole 510 by welding, and the moisture penetration preventing member 170 is attached to the entire sealing portion 160 formed at the edge of the pouch case by welding. Even if a crack occurs in the moisture penetration preventing member 170 adhered to an end of the sealing portion 160 and water penetrates into the gap, the moisture is gradually blocked by the moisture penetration preventing member filled in the hole 510. It is possible to effectively prevent the penetration of moisture from the outside.
또한, 리튬 이차 전지의 파우치형 케이스의 실링부에 필름과 같은 수분 침투 방지 부재를 부착함으로써 상기 실링부를 보다 견고히 결합시킬 수 있다.In addition, by attaching a moisture penetration preventing member such as a film to the sealing portion of the pouch type case of the lithium secondary battery, the sealing portion can be more firmly bonded.
도 6은 본 발명의 일 실시 예에 따른 파우치형 이차 전지 제조 방법을 나타내는 흐름도이다.도 6을 참조하면, 본 발명의 실시 예에 따른 파우치형 이차 전지를 제조하기 위해서는, 먼저 상부 파우치 케이스(110a)와 하부 파우치 케이스(110b)로 구성된 파우치 케이스와 양극판 및 음극판이 세퍼레이터를 사이에 두고 배치된 전극 조립체(120)를 준비한다.6 is a flowchart illustrating a pouch type secondary battery manufacturing method according to an embodiment of the present invention. Referring to FIG. 6, in order to manufacture a pouch type secondary battery according to an embodiment of the present invention, first, an upper pouch case 110a is illustrated. ) And an electrode assembly 120 having a pouch case consisting of a bottom pouch case 110b and a positive electrode plate and a negative electrode plate disposed therebetween.
이후, 파우치 케이스에 전극 조립체(120)를 수납하고, 상부 파우치 케이스(110a)와 하부 파우치 케이스(110b)를 열융착하여 실링부(160)를 형성한다(S610)(S630).Thereafter, the electrode assembly 120 is accommodated in the pouch case, and the upper pouch case 110a and the lower pouch case 110b are heat-sealed to form a sealing unit 160 (S610) (S630).
상기 파우치 케이스의 가장자리에 형성된 실링부(160)의 단부 및 상기 실링부(160)의 상, 하부면을 모두 포함하여 수분 침투 방지 필름(170)을 부착한다. 이때, 상기 수분 침투 방지 필릉(170)은 용접 방식(예컨대, 초음파 용접, 레이저 용접 등)에 의해 실링부(160)에 부착될 수 있다(S650).The water permeation prevention film 170 is attached to the edge of the pouch case including the end of the sealing part 160 and the upper and lower surfaces of the sealing part 160. In this case, the moisture penetration preventing filtrate 170 may be attached to the sealing unit 160 by a welding method (eg, ultrasonic welding, laser welding, etc.) (S650).
구체적으로, 수분의 침투는 실링부(160) 형성시 열융착 과정에서 상부 파우치 케이스(110a)와 하부 파우치 케이스(110b)가 서로 결합되는 내측 수지층의 빈틈을 통해 침투하므로, 파우치 케이스의 가장자리에 형성된 실링부(160)에 부착되는 수분 침투 방지 부재(170)는 상기 실링부(160)의 단부에 부착되는 폭 방향(W)을 상기 실링부(160)의 상, 하부에 부착되는 높이(H) 방향보다 두껍게 형성하여 외부로부터의 수분이 침투할 수 있는 거리를 보다 멀리 형성하는 것이 바람직할 수 있다.In detail, the penetration of moisture penetrates through the gap of the inner resin layer where the upper pouch case 110a and the lower pouch case 110b are coupled to each other during the heat fusion process when the sealing unit 160 is formed. The moisture penetration preventing member 170 attached to the formed sealing part 160 has a height H attached to the upper and lower portions of the sealing part 160 in a width direction W attached to an end of the sealing part 160. It may be preferable to form a thicker than the () direction to form a distance that can penetrate moisture from the outside.
이때, 상기 수분 침투 방지 부재(170)는 폴리에틸렌테레프탈레이트(polyethylene terephthalate : PET)와 같은 필름일 수 있으며, 상기 폴리에틸렌테레프탈레이트(PET)는 테레프탈산과 에틸렌글리콜을 중축합하여 얻을 수 있는 포화폴리에스테르로써, 온도 및 습도의 영향을 적게 받으며 흡수성이 적은 특징을 가지고 있다. 상기 수분 침투 방지 부재(170)는 이에 한하지 않으며, 수분 침투를 방지할 수 있는 물질이면 관계없다. 구체적으로, 접착제, 밀봉 및 방수제 계열의 물질 예컨대, 실리콘 계열, 에폭시 계열, 시아노아크릴산 계열, 폴리비닐아크릴레이트 계열, 에틸렌비닐아세테이트 계열, 아크릴레이트 계열, 폴르클로로프렌 계열, 폴리우레탄 수지와 폴리에스터 수지의 혼합체 계열, 폴리올과 폴리 우레텐 수지의 혼합체 계열, 아크릴릭 폴리머와 폴리우레탄 수지의 혼합체 계열, 폴리이미드 계열 및 시아노아크릴레이트와 우레탄의 혼합체 계열 중 선택되는 어느 하나 또는 이들 중 2종 이상의 혼합물을 사용할 수 있다. 바람직하게, 상기 수분 침투 방지 부재(17)는 에폭시 계열 수지 및 실리콘 계열 수지 중 어느 하나를 단독으로 또는 이들을 혼합하여 사용할 수 있다.In this case, the moisture penetration preventing member 170 may be a film such as polyethylene terephthalate (PET), the polyethylene terephthalate (PET) is a saturated polyester obtained by polycondensation of terephthalic acid and ethylene glycol, It is less affected by temperature and humidity and has less absorbency. The moisture penetration preventing member 170 is not limited thereto and may be any material that can prevent moisture penetration. Specifically, adhesives, sealants and waterproofing materials such as silicone based, epoxy based, cyanoacrylic acid based, polyvinyl acrylate based, ethylene vinyl acetate based, acrylate based, polychloroprene based, polyurethane resin and polyester resin Any one selected from the group consisting of a mixture of polyols and polyureten resins, a mixture of acrylic polymers and polyurethane resins, a polyimide series and a mixture of cyanoacrylates and urethanes, or a mixture of two or more thereof Can be used. Preferably, the moisture penetration preventing member 17 may be used either alone or a mixture of epoxy-based resin and silicone-based resin.
또한, 수분이 침투하더라도 이를 단계적으로 차단하기 위해 실링부(160)에 상기 수분 침투 방지 부재(170)를 부착하기 전에 홀을 형성할 수 있다.In addition, even if moisture penetrates, a hole may be formed before attaching the moisture penetrating preventing member 170 to the sealing unit 160 to block it step by step.
즉, 열융착으로 실링부(160)를 형성하고 상기 실링부(160)에 홀(510)을 형성한 후, 상기 실링부(160)에 형성된 홀(510)에 수분 침투 방지 부재(170)를 채워 넣어 외부로부터 수분이 침투하는 것을 보다 효과적으로 차단할 수 있다.That is, after forming the sealing part 160 by heat fusion and forming the hole 510 in the sealing part 160, the moisture penetration preventing member 170 is formed in the hole 510 formed in the sealing part 160. It can be filled more effectively to prevent the penetration of moisture from the outside.
예컨대, 상기 홀(510)은 파우치 케이스의 가장자리에 형성된 실링부(160)를 다수의 돌기가 형성된 금형 지그로 가압하여 형성할 수 있으며, 상기 홀(510)은 전극리드가 형성된 길이 방향으로 넓게 형성하는 것이 바람직하다. 이때, 본 발명의 실시 예에서 상시 홀(510)은 차단막 역할을 할 수 있도록 사각형 모양으로 형성되는 것으로 설명하지만, 이에 한하지 않으며, 외부로부터 수분을 차단할 수 있는 형태이면 다양하게 채택될 수 있다.For example, the hole 510 may be formed by pressing the sealing part 160 formed at the edge of the pouch case with a mold jig having a plurality of protrusions, and the hole 510 may be formed in a length direction in which the electrode lead is formed. It is desirable to. At this time, in the embodiment of the present invention, the hole 510 is described as being formed in a rectangular shape to serve as a blocking film, but is not limited thereto, and may be variously adopted as long as it can block moisture from the outside.
이후, 상기 홀(510)에 수분 침투 방지 부재(170)를 용접을 통해 채워 넣고, 파우치 케이스의 가장자리에 형성된 실링부(160) 전체에 용접을 통해 수분 침투 방지 부재(170)를 부착함으로써, 혹시라도 실링부(160)의 단부에 접착된 상기 수분 침투 방지 부재(170)에 균열이 생겨 그 틈으로 수분이 침투하더라도 상기 홀(510)에 채워진 수분 침투 방지 부재(170)에 의해 단계적으로 수분이 차단됨으로써 보다 효과적으로 외부로부터 수분이 침투되는 것을 방지할 수 있다.Subsequently, the water penetration preventing member 170 is filled into the hole 510 by welding, and the moisture penetration preventing member 170 is attached to the entire sealing portion 160 formed at the edge of the pouch case by welding. Even if a crack occurs in the moisture penetration preventing member 170 adhered to the end of the seal portion 160, even if moisture penetrates into the gap, moisture is gradually stepped by the moisture penetration preventing member 170 filled in the hole 510. By blocking, water can be prevented from penetrating more effectively from the outside.
이상과 같이, 본 발명은 비록 한정된 실시 예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 한정되지 않으며 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술사상과 아래에 기재될 특허청구범위의 균등범위 내에서 다양한 수정 및 변형이 가능함은 물론이다.As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is not limited by a person of ordinary skill in the art to which the present invention belongs, and the present invention belongs to the present invention. Various modifications and variations are possible to those skilled in the art within the scope of the technical spirit of the present invention and the equivalent scope of the claims to be described below.

Claims (7)

  1. 양극판과 음극판이 세퍼레이터를 사이에 두고 배치된 전극 조립체; 및An electrode assembly in which a positive electrode plate and a negative electrode plate are disposed with the separator interposed therebetween; And
    상기 전극 조립체 및 전해액을 내부에 수납하고 패키징 한 후, 가장자리를 따라 실링부가 형성된 파우치형 케이스;를 포함하고,And a pouch-type case in which a sealing portion is formed along an edge after accommodating and packaging the electrode assembly and the electrolyte therein,
    상기 파우치형 케이스의 가장자리에 형성된 실링부 전체에 수분 침투 방지 부재가 용접에 의해 부착되는 것을 특징으로 하는 파우치형 이차 전지.A pouch type secondary battery, wherein a moisture permeation preventing member is attached to the entire sealing part formed at an edge of the pouch type case by welding.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 수분 침투 방지 부재는 실링부의 단부에 부착된 폭 방향이 실링부의 상,하부에 부착된 높이 방향보다 두껍게 형성되어 용접에 의해 부착되는 것을 특징으로 하는 파우치형 이차 전지.The moisture penetration preventing member is a pouch type secondary battery, characterized in that the width direction attached to the end of the sealing portion is formed thicker than the height direction attached to the upper and lower portions of the sealing portion is attached by welding.
  3. 제 1 항에 있어서,The method of claim 1,
    상기 실링부는 다수의 돌기가 형성된 금형 지그에 의해 가압되어 홀이 형성되고,The sealing part is pressed by a mold jig in which a plurality of protrusions are formed, and a hole is formed.
    상기 수분 침투 방지 부재는 용접에 의해 상기 홀을 메우고, 실링부 전체에 부착되는 것을 특징으로 하는 파우치형 이차 전지.The moisture penetration preventing member fills the hole by welding and is attached to the entire sealing part.
  4. 제 3 항에 있어서,The method of claim 3, wherein
    상기 홀은 전극리드가 형성된 길이 방향으로 사각형 모양으로 형성되는 것을 특징으로 하는 파우치형 이차 전지.The hole is a pouch type secondary battery, characterized in that formed in a rectangular shape in the longitudinal direction in which the electrode lead is formed.
  5. 제 1 항에 있어서,The method of claim 1,
    상기 수분 침투 방지 부재는 폴리에틸렌테레프탈레이트(PET)인 것을 특징으로 하는 파우치형 이차 전지.The moisture permeation preventing member is a polyethylene terephthalate (PET) pouch type secondary battery, characterized in that.
  6. 제 1 항에 있어서,The method of claim 1,
    상기 수분 침투 방지 부재는 실리콘 계열, 에폭시 계열, 시아노아크릴산 계열, 폴리비닐아크릴레이트 계열, 에틸렌비닐아세테이트 계열, 아크릴레이트 계열, 폴르클로로프렌 계열, 폴리우레탄 수지와 폴리에스터 수지의 혼합체 계열, 폴리올과 폴리 우레텐 수지의 혼합체 계열, 아크릴릭 폴리머와 폴리우레탄 수지의 혼합체 계열, 폴리이미드 계열 및 시아노아크릴레이트와 우레탄의 혼합체 계열 중 선택되는 어느 하나 또는 이들 중 2종 이상의 혼합물인 것을 특징으로 하는 파우치형 이차 전지.The moisture penetration preventing member may be a silicone series, an epoxy series, a cyanoacrylic acid series, a polyvinyl acrylate series, an ethylene vinyl acetate series, an acrylate series, a polychloroprene series, a mixture series of a polyurethane resin and a polyester resin, a polyol and a poly Pouch type secondary, characterized in that any one selected from the group consisting of a mixture of a urethane resin, a mixture of an acrylic polymer and a polyurethane resin, a polyimide series and a mixture of a cyanoacrylate and urethane, or a mixture of two or more thereof battery.
  7. 제 1 항에 있어서,The method of claim 1,
    상기 수분 침투 방지 부재는 에폭시 계열 수지 및 실리콘 계열 수지 중 어느 하나 또는 이들의 혼합물인 것을 특징으로 하는 파우치형 이차 전지.The moisture penetration preventing member is a pouch type secondary battery, characterized in that any one or a mixture of epoxy resin and silicone resin.
PCT/KR2014/010395 2013-11-01 2014-10-31 Pouch-type secondary battery capable of preventing water permeation WO2015065124A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004103409A (en) * 2002-09-10 2004-04-02 Nissan Motor Co Ltd Battery, its manufacturing method, battery pack, and battery pack module
KR20070091877A (en) * 2006-03-08 2007-09-12 주식회사 엘지화학 Secondary battery of improved sealability
JP2007265879A (en) * 2006-03-29 2007-10-11 Nec Lamilion Energy Ltd Film-armored electric device and electric device assembly
KR20100071814A (en) * 2008-12-19 2010-06-29 주식회사 엘지화학 Pouch for secondary battery and secondary battery using the same
KR20120069319A (en) * 2010-12-20 2012-06-28 주식회사 엘지화학 Secondary battery with improved moisture barrier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004103409A (en) * 2002-09-10 2004-04-02 Nissan Motor Co Ltd Battery, its manufacturing method, battery pack, and battery pack module
KR20070091877A (en) * 2006-03-08 2007-09-12 주식회사 엘지화학 Secondary battery of improved sealability
JP2007265879A (en) * 2006-03-29 2007-10-11 Nec Lamilion Energy Ltd Film-armored electric device and electric device assembly
KR20100071814A (en) * 2008-12-19 2010-06-29 주식회사 엘지화학 Pouch for secondary battery and secondary battery using the same
KR20120069319A (en) * 2010-12-20 2012-06-28 주식회사 엘지화학 Secondary battery with improved moisture barrier

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